Remote rapid verification system for storage battery fault of transformer substation

Abstract

The invention relates to the technical field of substation maintenance, and particularly provides a substation storage battery fault remote rapid verification system, which comprises a storage battery monitoring system, a management terminal, an alarm unit and an intelligent discharge power supply, the management terminal is respectively connected with the battery monitoring module, the intelligent discharge power supply and the alarm unit; the storage battery monitoring module monitors state parameters of a transformer substation storage battery and sends the state parameters to the management terminal. The management terminal receives the state parameters to judge whether warning is needed or not, and if warning is needed, warning signals are sent to a warning module; the intelligent discharging unit is connected with a transformer substation storage battery; the management terminal is also used for controlling the intelligent discharge unit to discharge; the intelligent discharge unit is connected with the transformer station storage battery through the first switch, the parallel diode and the second switch in sequence. According to the invention, the problems of long capacity checking time and tedious steps are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of substation maintenance, and in particular relates to a remote rapid detection system for battery faults in a substation. Background Art

[0002] The DC power supply system of a substation is the core of the entire station power supply system and an important guarantee for the safe operation of the substation. In order to ensure the reliable performance and extended life of the substation battery pack, regular inspection and maintenance have become important tasks in the operation and maintenance of the power system. In the current battery maintenance practice, performing verification charging and discharging operations is a key measure to ensure the long-term stability and high reliability of the battery pack performance.

[0003] In the prior art, online monitoring tools are generally installed to regularly and in real time monitor the key parameters of the battery such as voltage and internal resistance to ensure the stable and healthy operation of the battery. However, it has the following disadvantages: First, it takes more than 10 hours to check the capacity of the battery pack at a current of 110 times the rate, and the discharge work of the capacity check takes a long time. Second, the construction of new substations every year increases the number of battery packs to be maintained, resulting in a shortage of maintenance personnel. Third, when checking the capacity of the battery, it is necessary to carry many instruments and facilities such as discharge equipment, operating tools, measuring tools and protective devices. The on-site operation is cumbersome and time-consuming, and there are high-risk safety hazards such as battery short circuit and grounding. Fourth, the battery capacity check can only be carried out periodically, with poor real-time performance, and it is impossible to detect serious internal faults of the battery in time, resulting in the inability to avoid accidents in the substation equipment in advance. Summary of the invention

[0004] In view of the problems in the prior art that battery capacity verification takes a long time, requires manual verification, requires a lot of equipment to be carried on site, has complicated operation steps and poor real-time performance, the present invention provides a remote rapid detection system for substation battery faults to solve the above technical problems.

[0005] In a first aspect, the present invention provides a remote rapid detection system for a substation battery fault, comprising: a battery monitoring system, a management terminal, an alarm unit and an intelligent discharge power supply; The management terminal is connected to the battery monitoring module, the intelligent discharge power supply, and the alarm unit respectively; The battery monitoring module monitors the status parameters of the substation battery and sends them to the management terminal; The management terminal receives the status parameters to determine whether an alarm is required, and if an alarm is required, sends an alarm signal to the alarm module; The intelligent discharge unit is connected to the substation battery; The management terminal is also used to control the intelligent discharge unit to discharge; The intelligent discharge unit is connected to the substation battery via a first switch, a parallel diode and a second switch in sequence.

[0006] Furthermore, when the discharge detection is performed, the management terminal controls the second switch to be disconnected and the first switch to be closed, and controls the intelligent discharge unit to discharge according to the preset discharge parameters; If the management terminal detects the conditions for stopping discharge, it controls the intelligent discharge unit to stop discharging and sends an alarm signal to the alarm unit; If the conditions for stopping discharge are not detected within the preset time, the intelligent discharge unit is controlled to stop discharging after the preset discharge time is reached; Control the second switch to close and the first switch to open, so as to restore the normal operation of the battery; The second switch is a DC isolating switch.

[0007] Furthermore, if the management terminal detects a condition for stopping discharge, the intelligent discharge unit is controlled to stop discharging, and an alarm signal is sent to the alarm unit, including: During the preset discharge time, the intelligent discharge unit discharges the substation battery; During the discharge process, the state parameters of the substation battery monitored by the battery monitoring module are obtained; The management terminal determines whether an alarm is required based on the status parameters, and sends an alarm signal to the alarm module if an alarm is required.

[0008] Furthermore, the management terminal determines whether an alarm is required based on the status parameter, including: The state parameters include: single-cell floating charge voltage of the battery, internal resistance of the battery, temperature of the battery body and floating charge current of the battery; Calculate the consistency of the battery pack voltage based on the single-cell float charge voltage of the battery; Based on the battery internal resistance, calculate the consistency of the battery internal resistance; Based on the battery body temperature, calculate the battery cell temperature extreme difference value; Based on the battery floating current, calculate the battery floating current change value; Based on the consistency of the battery pack voltage, the consistency of the battery internal resistance, the extreme difference of the battery cell temperature and the change of the battery floating current, it is judged whether the battery is abnormal.

[0009] Furthermore, based on the single-cell floating charge voltage of the battery, the consistency of the battery pack voltage is calculated, including: When the battery is in floating charge state, the difference between the battery cell voltage and the average value of the battery group voltage is calculated to obtain the consistency of the battery group voltage. ,in, ,in, is the single cell float charge voltage of the jth battery in a test cycle, n is the number of battery cells, i is hours, and each test cycle is 1 day.

[0010] Further, the consistency of the battery internal resistance is calculated based on the battery internal resistance, including: Calculate the difference between the internal resistance of the battery cell and the average value of the internal resistance of the entire battery group to obtain the consistency of the battery internal resistance ,in, ,in, is the internal resistance of the jth battery in a test cycle, and n is the number of battery cells.

[0011] Further, the battery cell temperature extreme difference value is calculated based on the battery body temperature, including: Calculate the maximum difference between the battery body temperature and the ambient temperature within a preset time period to obtain the battery cell temperature extreme difference value ,in, MAX ,in, is the measured temperature of the jth battery in a test cycle, is the corresponding measured ambient temperature.

[0012] Further, the battery floating current change value is calculated based on the battery floating current, including: Calculate the change in the real-time detected floating charge current relative to the normal initial floating charge current ,in, , where I is the actual floating charge current of the battery pack, It is the initial float charge current of the battery pack.

[0013] Furthermore, based on the consistency of the battery pack voltage, the consistency of the battery internal resistance, the extreme difference of the battery cell temperature and the change of the battery floating current, it is determined whether the battery is abnormal. If it is abnormal, an alarm is issued, including: when When the voltage is greater than or equal to the preset voltage threshold, an alarm is issued; when When the internal resistance is greater than or equal to the preset threshold, an alarm is issued; when When the temperature is greater than or equal to the preset temperature threshold, an alarm is issued; when When the current is greater than or equal to the preset current threshold, an alarm is issued.

[0014] Furthermore, the management terminal includes a remote / local switching switch, an embedded management terminal and a station-side public measurement and control device; the battery monitoring module is connected to the embedded management terminal and the station-side public measurement and control device respectively through the remote / local switching switch, so as to realize the control switching of the connection between the station-side public measurement and control device and the embedded management terminal, the station-side public measurement and control device is used to realize remote control of the intelligent discharge unit, and the embedded management terminal is used to realize local control of the intelligent discharge unit.

[0015] The beneficial effect of the present invention is that the remote rapid detection system for substation battery faults provided by the present invention can judge the health status and potential faults of the battery in a short time by real-time monitoring of the single-cell floating charge voltage, battery internal resistance, battery body temperature and battery floating charge current of the battery, thereby reducing the workload and safety risks of manual detection, especially when detecting large quantities of battery packs, improving the work efficiency and real-time performance of the system. It solves the problems of long battery capacity verification time, manual capacity verification, multiple equipment to be carried on site, cumbersome operation steps of capacity verification and poor real-time performance.

[0016] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a schematic block diagram of a system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] The present invention provides a remote rapid detection system for substation battery faults, such as Figure 1 As shown, including: Battery monitoring system, management terminal, alarm unit and intelligent discharge power supply. The management terminal is connected to the battery monitoring module, the intelligent discharge power supply and the alarm unit respectively. The battery monitoring module monitors the status parameters of the substation battery and sends them to the management terminal. The management terminal receives the status parameters to determine whether an alarm is required, and if an alarm is required, it sends an alarm signal to the alarm module. The intelligent discharge unit is connected to the substation battery. The management terminal is also used to control the intelligent discharge unit to discharge. The intelligent discharge unit is connected to the substation battery through a first switch, a parallel diode and a second switch in sequence.

[0022] Specifically, the management terminal is the overall monitoring unit for the battery serious fault detection and capacity verification system. It uses an embedded Linux operating system as the operating platform for the program module, and is equipped with a touch screen human-computer interaction interface to control the on / off of the intelligent discharge unit. The specific functions are as follows: (1) Battery online monitoring system. The battery monitoring system can monitor key parameters such as battery pack voltage, current, temperature, cell voltage, and cell internal resistance in real time.

[0023] (2) Battery voltage and internal resistance consistency analysis function. Analyze the consistency of the battery single-cell floating charge voltage, equalization charge voltage and discharge voltage, and issue a battery consistency abnormality alarm reminder when it exceeds the set range.

[0024] (3) Battery cell voltage and internal resistance operation trend analysis function. By analyzing the operating curves of the single cell voltage and internal resistance in a certain period of time, the degradation state of the single cell can be judged, and an alarm will be issued when it exceeds the set range.

[0025] (4) Battery cell temperature abnormality analysis function: By real-time monitoring of the surface temperature of the battery cells, early warning can be issued for batteries with abnormal cell temperatures.

[0026] (5) Automatic shutdown function of intelligent discharge unit. During the discharge process of the battery pack, if there is a single cell low voltage alarm, a whole group low voltage alarm, a high temperature alarm, the discharge time ends, the discharge capacity is met, etc., the discharge will be automatically stopped and the alarm signal and corresponding information will be uploaded.

[0027] (6) Adjustment of intelligent discharge unit current function. The discharge current can be controlled during the discharge process of the battery pack, and the battery can be discharged at a fixed discharge current or in increments according to a preset time step.

[0028] The battery monitoring device consists of a voltage acquisition unit and an internal resistance test unit. It adopts a modular structure and a downward installation method. It is installed on the battery screen or battery rack. The voltage acquisition unit collects the battery cell voltage, cell temperature, and ambient temperature in real time, and uploads the collected data to the embedded monitoring and management terminal in real time. The internal resistance acquisition unit starts the internal resistance test function at the specified time according to the internal resistance test strategy of the embedded monitoring and management terminal to complete the internal resistance test function. The embedded monitoring and management terminal will calculate the battery internal resistance value based on the cell voltage and current values ​​collected during this test.

[0029] Under the premise that the charger and battery pack are not separated from the system, the intelligent discharge unit can realize the discharge of the battery pack by controlling the battery pack switch and discharge switch locally or remotely, and linking the embedded management terminal to start the intelligent discharge unit. Combined with parameters such as the battery pack voltage drop rate and discharge current, it can intelligently complete the detection of battery faults and the battery pack's tolerance to impact loads, discover battery faults in time, realize battery pack impact performance detection and online desulfurization, and perform capacity verification regularly.

[0030] In one possible implementation, when performing discharge detection, the management terminal controls the second switch to be disconnected and the first switch to be closed, and controls the intelligent discharge unit to discharge according to preset discharge parameters. If the monitoring management terminal detects the conditions for stopping discharge, the intelligent discharge unit is controlled to stop discharging and an alarm signal is sent to the alarm unit.

[0031] Within the preset discharge time, the intelligent discharge unit discharges the substation battery. During the discharge process, the status parameters of the substation battery monitored by the battery monitoring module are obtained. Based on the status parameters, the management terminal determines whether an alarm is required. If an alarm is required, an alarm signal is sent to the alarm module.

[0032] The status parameters include: battery single-cell float charge voltage, battery internal resistance, battery body temperature and battery float charge current.

[0033] Includes steps Q1-Q5.

[0034] Q1. Calculate the consistency of the battery pack voltage based on the single-cell float charge voltage of the battery.

[0035] When the battery is in floating charge state, the difference between the battery cell voltage and the average value of the battery group voltage is calculated to obtain the consistency of the battery group voltage. ,in, ,in, is the single cell float charge voltage of the jth battery in a test cycle, n is the number of battery cells, i is hours, and each test cycle is 1 day.

[0036] Q2. Based on the battery internal resistance, calculate the consistency of the battery internal resistance.

[0037] Calculate the difference between the internal resistance of the battery cell and the average value of the internal resistance of the entire battery group to obtain the consistency of the battery internal resistance ,in, ,in, is the internal resistance of the jth battery in a test cycle, and n is the number of battery cells.

[0038] Q3. Calculate the temperature extremes of the battery cells based on the battery body temperature.

[0039] Calculate the maximum difference between the battery body temperature and the ambient temperature within a preset time period to obtain the battery cell temperature extreme difference value ,in, MAX ,in, is the measured temperature of the jth battery in a test cycle, is the corresponding measured ambient temperature.

[0040] Q4. Based on the battery floating current, calculate the battery floating current change value.

[0041] Calculate the change in the real-time detected floating charge current relative to the normal initial floating charge current ,in, , where I is the actual floating charge current of the battery pack, It is the initial float charge current of the battery pack.

[0042] Q5. Determine whether the battery is abnormal based on the consistency of the battery pack voltage, the consistency of the battery internal resistance, the extreme difference in battery cell temperature and the change in battery floating current.

[0043] when When the voltage is greater than or equal to the preset threshold, an alarm is issued; when When the internal resistance is greater than or equal to the preset threshold, an alarm is issued; when When the temperature is greater than or equal to the preset threshold, an alarm is issued; when When the current is greater than or equal to the preset current threshold, an alarm is issued.

[0044] If the condition for stopping discharge is not detected within the preset time, the intelligent discharge unit is controlled to stop discharging after the preset discharge time is reached. The second switch is controlled to close and the first switch is disconnected to restore the normal operation of the battery. The second switch is a DC isolation switch.

[0045] Specifically, a rectifier tube (diode) is added to the battery circuit to control the direction of the current, and a DC isolation switch is connected in parallel at both ends of the rectifier tube (diode). Intelligent discharge can be achieved by controlling the opening and closing of this switch. When the DC isolation switch is closed, the DC system works normally. The DC switch is disconnected to discharge the battery. By using the unidirectional conduction property of the rectifier tube (diode), the charging device cannot charge the battery in this state, but can supply power to the load in an emergency. This solution can ensure that the battery does not separate from the load equipment and has a protective measure.

[0046] In one possible implementation, the management terminal includes a remote / local switching switch, an embedded management terminal and a station-side public measurement and control device; the battery monitoring module is connected to the embedded management terminal and the station-side public measurement and control device respectively through the remote / local switching switch, so as to realize the control switching of the connection between the station-side public measurement and control device and the embedded management terminal, the station-side public measurement and control device is used to realize remote control of the intelligent discharge unit, and the embedded management terminal is used to realize local control of the intelligent discharge unit.

[0047] Specifically, combined with the data report analysis of 596 battery groups in 449 substations maintained by Binzhou Company in the past eight years, the results are as follows: During the battery discharge process, 278 batteries in 88 substations showed unqualified voltage. Among them, 96 batteries (34.53%) dropped to unqualified or even 0 volts within 0-5 minutes after the start of discharge, distributed in 21 substations. 9 batteries (3.23%) dropped to unqualified or even 0 volts within 30 minutes, 4 batteries (1.43%) within 1 hour, 24 batteries (8.63%) within 2 hours, 26 batteries (9.35%) within 3 hours, and 26 batteries (9.35%) within 4 hours. The voltage of 52 batteries (18.70%) dropped to unqualified levels within 5 hours. To summarize further, 136 cells (56.66% of the total cells) dropped below 2 volts within 1 hour of discharge, 35 cells (14.58% of the total cells) dropped below 2 hours of discharge, 24 cells (10% of the total cells) dropped below 3 hours of discharge, and 11 cells (4.58% of the total cells) dropped below 2 volts within 4 hours of discharge.

[0048] A large amount of data analysis shows that about 34% of the batteries have a voltage drop below 1.8V or even 0V within 0-5 minutes before the verification discharge. After professional disassembly, it was found that these batteries all have serious faults. The abnormal situation is not easy to detect under the floating charge operation state, but it is immediately discovered during the I10 rate current discharge. Based on this phenomenon, this plan is formulated: through a short-term (0-5 minutes) I10 rate current discharge, the health status of the entire battery group is detected. If a battery with a voltage lower than 1.8V is detected within 5 minutes, emergency repairs are carried out according to the battery emergency solution. If there is no abnormal battery, normal maintenance is carried out according to the regulations.

[0049] Specifically, when conducting remote rapid battery serious fault detection, the remote control switch is first actuated. After the switch is in place, the on-site embedded management terminal detects that the switch is in the discharge state, and automatically starts the discharger (I10 times) for a short time (5 minutes) discharge. During the discharge process, the system automatically detects the operating status of the battery in real time. When it detects that the voltage of any single cell is lower than 1.8V, it automatically sends an alarm signal, which is uploaded to the centralized control system through the public measurement and control screen. At the same time, the embedded management terminal sends a stop discharge command to the discharger and sends a "discharge has stopped" signal.

[0050] Therefore, the present invention can determine the health status and potential faults of the battery in a short time by monitoring the voltage of the battery in real time, thereby reducing the workload and safety risks of manual detection, especially when detecting large quantities of battery packs, improving the work efficiency and real-time performance of the system. The problems of long battery capacity verification time, manual capacity verification, many equipment to be carried on site, cumbersome operation steps and poor real-time performance are solved. The technical effects that can be achieved by this embodiment can be found in the description above and will not be repeated here.

[0051] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, including several instructions for enabling a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.

[0052] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0053] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or modules, which can be electrical, mechanical or other forms.

[0054] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0055] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0056] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A remote rapid detection system for substation battery faults, characterized in that: include: Battery monitoring system, management terminal, alarm unit and intelligent discharge power supply; The management terminal is connected to the battery monitoring module, the intelligent discharge power supply, and the alarm unit respectively; The battery monitoring module monitors the status parameters of the substation battery and sends them to the management terminal; The management terminal receives the status parameters to determine whether an alarm is required, and if an alarm is required, sends an alarm signal to the alarm module; The intelligent discharge unit is connected to the substation battery; The management terminal is also used to control the intelligent discharge unit to discharge; The intelligent discharge unit is connected to the substation battery via a first switch, a parallel diode and a second switch in sequence.

2. The system according to claim 1, characterized in that When performing discharge detection, the management terminal controls the second switch to be disconnected and the first switch to be closed, and controls the intelligent discharge unit to discharge according to preset discharge parameters; If the management terminal detects the conditions for stopping discharge, it controls the intelligent discharge unit to stop discharging and sends an alarm signal to the alarm unit; If the conditions for stopping discharge are not detected within the preset time, the intelligent discharge unit is controlled to stop discharging after the preset discharge time is reached; Control the second switch to close and the first switch to open, so as to restore the normal operation of the battery; The second switch is a DC isolating switch.

3. The system according to claim 2, characterized in that If the management terminal detects the condition for stopping discharging, the intelligent discharging unit is controlled to stop discharging, and an alarm signal is sent to the alarm unit, including: During the preset discharge time, the intelligent discharge unit discharges the substation battery; During the discharge process, the state parameters of the substation battery monitored by the battery monitoring module are obtained; The management terminal determines whether an alarm is required based on the status parameters, and sends an alarm signal to the alarm module if an alarm is required.

4. The system according to claim 1, characterized in that The management terminal determines whether an alarm is required based on the status parameter, including: The state parameters include: single-cell floating charge voltage of the battery, internal resistance of the battery, temperature of the battery body and floating charge current of the battery; Calculate the consistency of the battery pack voltage based on the single-cell float charge voltage of the battery; Based on the battery internal resistance, calculate the consistency of the battery internal resistance; Based on the battery body temperature, calculate the battery cell temperature extreme difference value; Based on the battery floating current, calculate the battery floating current change value; Based on the consistency of the battery pack voltage, the consistency of the battery internal resistance, the extreme difference of the battery cell temperature and the change of the battery floating current, it is judged whether the battery is abnormal.

5. The system according to claim 4, characterized in that Calculate the consistency of the battery pack voltage based on the single battery float charge voltage, including: When the battery is in floating charge state, the difference between the battery cell voltage and the average value of the battery group voltage is calculated to obtain the consistency of the battery group voltage. ,in, ,in, is the single cell float charge voltage of the jth battery in a test cycle, n is the number of battery cells, i is hours, and each test cycle is 1 day.

6. The system according to claim 4, characterized in that The consistency of calculating the battery internal resistance based on the battery internal resistance includes: Calculate the difference between the internal resistance of the battery cell and the average value of the internal resistance of the entire battery group to obtain the consistency of the battery internal resistance ,in, ,in, is the internal resistance of the jth battery in a test cycle, and n is the number of battery cells.

7. The system according to claim 4, characterized in that The temperature extreme value of the battery cell is calculated based on the battery body temperature, including: Calculate the maximum difference between the battery body temperature and the ambient temperature within a preset time period to obtain the battery cell temperature extreme difference value ,in, MAX ,in, is the measured temperature of the jth battery in a test cycle, is the corresponding measured ambient temperature.

8. The system according to claim 4, characterized in that The battery floating current change value is calculated based on the battery floating current, including: Calculate the change in the real-time detected floating charge current relative to the normal initial floating charge current ,in, , where I is the actual floating charge current of the battery pack, It is the initial float charge current of the battery pack.

9. The system according to claim 4, characterized in that Based on the consistency of battery pack voltage, battery internal resistance, battery cell temperature extreme difference and battery floating current change, determine whether the battery is abnormal. If abnormal, an alarm is issued, including: when When the voltage is greater than or equal to the preset voltage threshold, an alarm is issued; when When the internal resistance is greater than or equal to the preset threshold, an alarm is issued; when When the temperature is greater than or equal to the preset temperature threshold, an alarm is issued; when When the current is greater than or equal to the preset current threshold, an alarm is issued.

10. The system according to claim 1, characterized in that The management terminal includes a remote / local switching switch, an embedded management terminal and a station-side public measurement and control device; the battery monitoring module is connected to the embedded management terminal and the station-side public measurement and control device respectively through the remote / local switching switch, so as to realize the control switching of the connection between the station-side public measurement and control device and the embedded management terminal, the station-side public measurement and control device is used to realize remote control of the intelligent discharge unit, and the embedded management terminal is used to realize local control of the intelligent discharge unit.

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