CN112904201A - Real-time online evaluation system and method for charging and discharging processes of energy storage battery - Google Patents
Real-time online evaluation system and method for charging and discharging processes of energy storage battery Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 67
- 238000011156 evaluation Methods 0.000 title claims abstract description 41
- 238000007599 discharging Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims description 13
- 238000013210 evaluation model Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000000178 monomer Substances 0.000 abstract description 23
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention provides a real-time online evaluation system for the charging and discharging process of an energy storage battery, which comprises a battery energy storage unit, a sensing detection unit, a main control unit, an energy management system and application software, wherein the energy management system is electrically connected with the main control unit, the sensing detection unit is connected and communicated with the main control unit through a field bus, the sensing detection unit is used for measuring various data of the battery energy storage unit, and the application software is integrated in the energy management system and used for evaluating the energy storage battery in real time. The invention can evaluate the energy storage battery in real time in the operation process of the energy storage system and monitor the performance of each battery monomer in real time.
Description
Technical Field
The invention relates to the technical field of battery online evaluation, in particular to a real-time online evaluation system and method for the charging and discharging process of an energy storage battery.
Background
The development of clean energy is greatly promoted by the problems of environmental pollution, global temperature rise and the like caused by the use of the traditional fossil fuel, so that energy conservation and environmental protection become one of the most important research directions at present and are necessary means for relieving the shortage of energy and severe environment at present. The battery energy storage system plays a great role in storing clean energy as a current popular research hotspot, and promotes the development requirement of renewable energy.
Lithium ion batteries have become the main component of current energy storage systems due to their long service life, high energy density, low self-discharge, and other characteristics. The lithium ion battery is used as the energy storage battery, so that the load of a power grid in a peak period and a peak period can be effectively reduced, and the impact of the power load on the power grid is reduced.
The energy storage system is generally composed of a plurality of energy storage battery monomers, but the battery performances are different due to different batteries in different manufacturing processes and different running states, so that internal inconsistency exists in the battery pack, and the service performance and safety of the energy storage system are affected. Therefore, the energy storage battery needs to be evaluated in real time during the operation of the energy storage system.
Disclosure of Invention
In order to prevent the safety of the energy storage system in the operation process, the invention provides a real-time online evaluation system for the charging and discharging process of an energy storage battery, which can evaluate the energy storage battery in real time in the operation process of the energy storage system and monitor the performance of each battery monomer in real time.
In order to realize the purpose, the following technical scheme is provided:
the utility model provides a real-time online evaluation system of energy storage battery charge-discharge process, includes battery energy storage unit, sensing detecting element, main control unit, energy management system and application software, energy management system is connected with the main control unit, sensing detecting element passes through field bus and main control unit and is connected communication, sensing detecting element is used for measuring each item data of battery energy storage unit, application software integration is in the energy management system for carry out real-time aassessment to the energy storage battery.
The invention utilizes the sensing detection unit to detect each battery monomer of the battery energy storage unit, can effectively monitor the performance of each battery monomer, has comprehensive detection, the main control unit is used for carrying out charging and discharging electric energy quality analysis on the battery monomers to obtain ripple wave change and maximum rise and fall time in the charging and discharging process of the battery, and is also used for processing various data of the sensing detection unit, transmitting the processed data into the energy management system, and finally carrying out real-time evaluation on the energy storage battery by application software, and reminding a worker to replace the battery monomers when the performance of the battery monomers is poor, so as to avoid that overlarge inconsistency exists among the batteries affects the stability of the system, thereby improving the service performance and the safety of the energy storage system.
Preferably, the sensing unit comprises a temperature sensing array subunit, a charging and discharging voltage and current recording subunit, an environment sensing subunit and a battery management system.
Preferably, the battery energy storage unit comprises a plurality of battery monomers and an energy storage converter, the battery energy storage unit comprises a battery monomer array and an energy storage converter, the battery monomer array is composed of battery strings, and each string of batteries is connected to the energy storage converter.
Preferably, the temperature sensing array subunit includes a temperature sensor array and a temperature sensing main control module, the temperature sensing array is arranged on the battery cells and is connected with the temperature sensing main control module through a single-wire bus for communication, the temperature sensing main control module includes a first power module, a first MCU module and a first communication module, and the temperature sensing array subunit is configured to measure temperature data of each battery cell.
Preferably, the charging and discharging voltage and current recording subunit includes a second power module, a second MCU module and a second communication module, and is configured to obtain a charging and discharging voltage and current waveform and record a line voltage and current variation wave before and after an abnormal condition is instantaneous.
Preferably, the environment sensing subunit comprises a temperature sensing module, a humidity sensing module, a volatile gas sensing module, an infrared image sensing module, a third power module, a third MCU module and a third communication module, and is used for measuring the real-time temperature and humidity of the environment and the concentration and open fire of volatile gas.
Preferably, the battery management system comprises a single battery management module, a battery pack management module and a battery system management module, wherein each group of batteries comprises a collection unit in a battery box for collecting the voltage and current of each battery and detecting the insulation resistance, the battery pack management system is also provided with a battery pack control module for communicating with the battery pack management unit and the energy storage converter to upload the current battery system information, and the battery pack management unit is communicated with the background monitoring through a network port.
A real-time online evaluation method for the charging and discharging process of an energy storage battery adopts the real-time online evaluation system for the charging and discharging process of the energy storage battery, and comprises the following steps:
1) constructing a battery charge and discharge index system;
establishing a battery charging and discharging index system based on an entropy weight Vague collector, and performing evaluation grade division on the battery safety performance according to the evaluation index values;
2) determining objective weight of data indexes;
objectively assigning values according to the correlation of the index parameters by using an entropy weight assignment method, namely determining the weight by the data information quantity of each index;
3) converting the evaluation index value into a value of figure;
the value ranges of various battery data and respective dimensions are different, and original various data are converted into a value of figure, so that the data characteristics are favorably processed and analyzed;
4) establishing an entropy weight Vague set comprehensive evaluation model and outputting an evaluation index value;
and establishing an entropy weight Vague set comprehensive evaluation model by using the determined Vague value, outputting evaluation index values of each battery, and comparing a battery charge and discharge evaluation system to determine the safety performance of the battery.
Preferably, the evaluation grades include A, B, C, D four grades respectively representing superior, good, passing and failing battery safety performances, and the index value is in the following range of 1 according to the four grades of the battery safety performances>Xmax>Xmid>Xmin>0. The specific rating scale is as follows:
class A, excellent safety performance of battery, and index value greater than XmaxAnd is less than or equal to 1;
b grade, good battery safety performance and index value larger than XmidAnd is less than or equal to Xmax；
Grade C, passing battery safety performance, and index value greater than XminAnd is less than or equal to Xmid；
Grade D, failing to ensure the safety of the battery, and index value less than or equal to Xmin。
The invention has the beneficial effects that: each battery monomer of the battery energy storage unit is detected by the sensing detection unit, so that the performance of each battery monomer can be effectively monitored, and the detection is comprehensive; the main control unit transmits processed data into the energy management system, the energy storage battery is evaluated in real time by application software, and when the performance of the battery monomer is poor, a worker is reminded to replace the battery monomer so as to prevent the battery pack from having internal inconsistency, and therefore the service performance and the safety of the energy storage system are improved.
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FIG. 1 is a schematic diagram of a system configuration of an embodiment;
FIG. 2 is a schematic flow chart of the method of the embodiment.
Detailed Description
Example (b):
in this embodiment, a container type smart grid energy storage system is selected from a certain place, and the system is implemented on the premise of the technical scheme of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
The embodiment provides a real-time online evaluation system for the charging and discharging processes of an energy storage battery, and with reference to fig. 1, the real-time online evaluation system comprises a battery energy storage unit, a sensing detection unit, a main control unit, an energy management system and application software, wherein the energy management system is connected with the main control unit, the sensing detection unit is connected and communicated with the main control unit through a field bus, the sensing detection unit is used for measuring various data of the battery energy storage unit, and the application software is integrated in the energy management system and used for evaluating the energy storage battery in real time.
The battery energy storage unit is composed of lithium iron phosphate battery monomers (3.2V/120Ah), in the embodiment, 2 monomers are connected in parallel to form 1 battery string (3.2V/240Ah), each 228 strings form 1 battery group (3.2V/240Ah), 8 battery groups are totally connected, 8 battery groups are connected in parallel to 1 energy storage converter of 500KW, and the energy storage converter is connected with a power grid and a load to control the charging and discharging processes of the batteries.
The sensing detection unit comprises a temperature sensing array subunit, a charging and discharging voltage and current recording subunit, an environment sensing subunit and a battery management system.
The temperature sensing array subunit comprises a temperature sensor array and a temperature sensing main control module, the temperature sensing array is arranged on the battery monomers and is in communication with the temperature sensing main control module through a single-wire bus, the temperature sensing main control module comprises a first power supply module, a first MCU module and a first communication module, and the temperature sensing array subunit is used for measuring temperature data of each battery monomer.
The charging and discharging voltage and current recording subunit comprises a second power module, a second MCU module and a second communication module and is used for acquiring the charging and discharging voltage and current waveforms and recording the change waves of the line voltage and current before and after the abnormal condition is instantaneous.
The environment sensing subunit comprises a temperature sensing module, a humidity sensing module, a volatile gas sensing module, an infrared image sensing module, a third power module, a third MCU module and a third communication module, and is used for measuring the real-time temperature and humidity of the environment and the concentration and open fire of volatile gas.
The battery management system comprises a single battery management module, a battery pack management module and a battery system management module, wherein each group of batteries comprises a collection unit in a battery box for collecting the voltage and the current of each battery and detecting the insulation resistance, and the battery pack management system is also provided with a battery pack control module, is communicated with a battery stack management unit and an energy storage converter and uploads the current battery system information, and the battery stack management unit is communicated with a background through a network port.
And the main control unit is used for performing charging and discharging electric energy quality analysis to obtain ripple change and maximum rise and fall time in the charging and discharging process of the battery, processing various data of the sensing detection unit, and transmitting the processed data into the energy management system.
Referring to fig. 2, the present embodiment further provides a real-time online evaluation method for a charging and discharging process of an energy storage battery, where the real-time online evaluation system for a charging and discharging process of an energy storage battery includes the following steps:
1) constructing a battery charge and discharge index system;
establishing a battery charging and discharging index system based on entropy weight Vague collector, performing evaluation grade division on the battery safety performance according to the evaluation index values, and taking Xmax＝0.9，Xmid＝0.7，XminThe rating is 0.6 as follows:
class A, the battery safety performance is excellent, and the index value is greater than 0.9 and less than or equal to 1;
b level, the battery has good safety performance, and the index value of the battery is greater than 0.7 and less than or equal to 0.9;
grade C, battery safety performance is qualified, and the index value is greater than 0.6 and less than or equal to 0.7;
grade D, the battery safety performance is not up to standard, its index value is less than or equal to 0.6;
2) determining objective weight of data indexes;
objectively assigning values according to the correlation of the index parameters by using an entropy weight assignment method, namely determining the weight by the data information quantity of each index;
3) converting the evaluation index value into a value of figure;
the value ranges of various battery data and respective dimensions are different, and original various data are converted into a value of figure, so that the data characteristics are favorably processed and analyzed;
4) establishing an entropy weight Vague set comprehensive evaluation model and outputting an evaluation index value;
and establishing an entropy weight Vague set comprehensive evaluation model by using the determined Vague value, outputting evaluation index values of each battery, and comparing a battery charge and discharge evaluation system to determine the safety performance of the battery.
The invention has the advantages that: each battery monomer of the battery energy storage unit is detected by the sensing detection unit, so that the performance of each battery monomer can be effectively monitored, and the detection is comprehensive; the main control unit transmits processed data into the energy management system, the energy storage battery is evaluated in real time by application software, and when the performance of the battery monomer is poor, a worker is reminded to replace the battery monomer so as to prevent the battery pack from having internal inconsistency, and therefore the service performance and the safety of the energy storage system are improved.
Finally, it should also be noted that the above-mentioned list is only one specific embodiment of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. The real-time online evaluation system for the charging and discharging processes of the energy storage battery is characterized by comprising a battery energy storage unit, a sensing detection unit, a main control unit, an energy management system and application software, wherein the energy management system is connected with the main control unit, the sensing detection unit is connected and communicated with the main control unit through a field bus, the sensing detection unit is used for measuring various data of the battery energy storage unit, and the application software is integrated in the energy management system and used for evaluating the energy storage battery in real time.
2. The system according to claim 1, wherein the sensing and detecting unit comprises a temperature sensing array subunit, a charging and discharging voltage and current recording subunit, an environment sensing subunit and a battery management system.
3. The system according to claim 2, wherein the battery energy storage unit comprises a battery cell array and an energy storage converter, the battery cell array is composed of battery strings, and each battery string is connected to the energy storage converter.
4. The real-time online evaluation system for the charging and discharging process of the energy storage battery as claimed in claim 3, wherein the temperature sensing array subunit comprises a temperature sensor array and a temperature sensing main control module, the temperature sensing array is arranged on the battery cells and is connected with the temperature sensing main control module through a single wire bus for communication, the temperature sensing main control module comprises a first power module, a first MCU module and a first communication module, and the temperature sensing array subunit is used for measuring the temperature data of each battery cell.
5. The real-time online evaluation system of the energy storage battery charging and discharging process according to claim 2, wherein the charging and discharging voltage and current recording subunit comprises a second power module, a second MCU module and a second communication module, and is configured to obtain the charging and discharging voltage and current waveforms and record the line voltage and current variation waves before and after the instant abnormal condition.
6. The system according to claim 2, wherein the environment sensing subunit comprises a temperature sensing module, a humidity sensing module, a volatile gas sensing module, an infrared image sensing module, a third power module, a third MCU module and a third communication module, and is configured to measure real-time temperature, humidity, and concentration of volatile gas, and open flame of the environment.
7. The real-time online evaluation system of the charging and discharging process of the energy storage battery as claimed in claim 3, wherein the battery management system comprises a single battery management module, a battery pack management module and a battery system management module, each battery pack comprises a collection unit in a battery box for collecting the voltage and current of each battery cell and detecting the insulation resistance, a battery pack control module is further provided to communicate with the battery pack management unit and the energy storage converter for uploading the current battery system information, and the battery pack management unit communicates with the background monitoring through a network port.
8. The real-time online evaluation system of the charging and discharging process of the energy storage battery as claimed in claim 1, wherein the main control unit is configured to perform the quality analysis of the charging and discharging power to obtain the ripple variation and the maximum rise and fall time during the charging and discharging process of the battery, and further configured to process each item of data of the sensing detection unit and transmit the processed data to the energy management system.
9. A real-time online evaluation method for the charging and discharging process of an energy storage battery, which adopts the real-time online evaluation system for the charging and discharging process of the energy storage battery as claimed in claim 1, is characterized by comprising the following steps:
1) constructing a battery charge and discharge index system;
establishing a battery charging and discharging index system based on an entropy weight Vague collector, and performing evaluation grade division on the battery safety performance according to the evaluation index values;
2) determining objective weight of data indexes;
objectively assigning values according to the correlation of the index parameters by using an entropy weight assignment method, namely determining the weight by the data information quantity of each index;
3) converting the evaluation index value into a value of figure;
4) establishing an entropy weight Vague set comprehensive evaluation model and outputting an evaluation index value;
and establishing an entropy weight Vague set comprehensive evaluation model by using the determined Vague value, outputting evaluation index values of each battery, and comparing a battery charge and discharge evaluation system to determine the safety performance of the battery.
10. The method according to claim 9, wherein the evaluation level comprises: A. b, C, D, respectively representing superior, good, passing and failing battery safety performance, the index value is in the following range according to the four battery safety performance levels: 1>Xmax>Xmid>Xmin>0. The specific rating scale is as follows:
class A, excellent safety performance of battery, and index value greater than XmaxAnd is less than or equal to 1;
b grade, good battery safety performance and index value larger than XmidAnd is less than or equal to Xmax；
Grade C, passing battery safety performance, and index value greater than XminAnd is less than or equal to Xmid；
Grade D, failing to ensure the safety of the battery, and index value less than or equal to Xmin。
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