Storage battery on-line monitoring and remote capacity checking device
By designing an online battery monitoring and remote capacity assessment device, the safety and reliability issues of battery monitoring and capacity assessment in substations were solved. This enabled unattended remote control and real-time data analysis, simplified the operation process, and reduced labor intensity and costs.
Patent Information
- Application Number
- CN202422949901.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-02
AI Technical Summary
In the existing technology, the monitoring and operation and maintenance mode of substation batteries cannot meet the requirements of safety and reliability. Moreover, the traditional capacity assessment method relies on manual operation, which is labor-intensive, costly, and difficult to achieve remote real-time monitoring and management.
A battery online monitoring and remote capacity assessment device was designed, including a centralized monitoring unit, a DC voltage acquisition unit, a DC current acquisition unit, and a bidirectional AC/DC power supply module. Through remote control technology and real-time data acquisition, the device enables real-time monitoring and analysis of battery operating parameters, supports verification discharge testing, and infers battery capacity and lifespan.
It enables safe and reliable battery monitoring and remote capacity verification under unattended operation, simplifies the operation process, reduces labor intensity and costs, and provides real-time data analysis and prediction functions.
Smart Images
Figure CN223624389U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of DC power supplies, and in particular to a battery online monitoring and remote capacity assessment device. Background Technology
[0002] With the increasing intelligence and digitalization of power plants and substations, and the growing demand for unmanned substations, remote monitoring of the operating status of DC power system batteries and online remote capacity assessment are crucial means to ensure the safe and reliable operation of DC systems. Achieving intelligent operation and maintenance of equipment through data-driven and intelligent management is imperative. Traditionally, battery capacity assessment in DC power systems primarily relies on manual on-site operations, which requires highly skilled operators, involves significant labor intensity, is costly, and necessitates stringent on-site safety measures.
[0003] While battery information in substations is currently integrated into the substation's comprehensive automation system, the large volume of data collected by this system, with a focus on relay protection management, often weakens or neglects the monitoring, maintenance, and management needs of power supply equipment, particularly batteries. How to remotely and effectively monitor and maintain substation batteries in real time is a pressing issue for operation and maintenance personnel. With the increasing use of batteries in substations, existing battery monitoring and operation and maintenance models can no longer meet the ever-higher requirements for safe and reliable battery operation. Therefore, it is necessary to provide an online battery monitoring and remote capacity assessment device that is simple and convenient to use, safe and reliable, facilitates unattended operation and remote control, records individual battery parameters in real time during capacity assessment, can export individual battery parameters, performs verification discharge tests on the current battery capacity, and accumulates and quantitatively analyzes the test data to infer the current battery capacity, its changing trend, and its lifespan. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a battery online monitoring and remote capacity assessment device. It is simple and convenient to use, safe and reliable, easy to operate without human intervention and remotely controlled, records the parameters of individual batteries in real time during capacity assessment, can export the parameters of individual batteries, tests the current capacity of the battery through verification discharge, and performs cumulative and quantitative analysis on the test data to infer the current battery capacity, change trend and lifespan.
[0005] The technical solution adopted by this utility model is as follows: This utility model includes a centralized monitoring unit, a DC voltage acquisition unit, and a DC current acquisition unit; the centralized monitoring unit is connected to a bidirectional AC / DC power module and a touch screen; the DC terminal of the bidirectional AC / DC power module is connected to an external battery under test via the DC current acquisition unit; the AC terminal of the bidirectional AC / DC power module is connected to an external three-phase AC power supply; the CAN communication interface of the bidirectional AC / DC power module is connected to the centralized monitoring unit; the centralized monitoring unit is connected to an external battery monitoring unit via an RS485 communication interface; the DC voltage acquisition unit is connected to the positive and negative terminals of the external battery under test, the positive and negative terminals of the external bus, and the positive and negative terminals of the DC terminal of the AC / DC power module; the DC current acquisition unit is connected to the positive terminal of the external battery under test.
[0006] As described above, this application monitors the operating parameters of the battery under test (voltage, current, temperature) and individual cells (voltage, temperature, internal resistance, and connector resistance) in real time. It also measures the current capacity of the battery through verification discharge, analyzes the changes in the operating parameters of individual cells before and after capacity testing, comprehensively measures and judges the performance and trends of individual cells, and provides alarm functions. A data interface is provided to achieve networked and intelligent management. Employing remote control technology, real-time data acquisition, and battery operating condition monitoring, it achieves remote charging / discharging management of the battery. This capacity testing device is simple, convenient, safe, reliable, and easy to use for unattended operation and remote control. In the capacity testing system, parameters such as the total voltage of the battery pack, the charging / discharging current of the battery pack, the voltage of individual cells, the temperature of individual cells, and the internal resistance of individual cells are monitored in real time. An interface is provided to communicate with the background software to achieve remote control functionality. After one-click start of capacity testing via a touchscreen or remote background software, the device will automatically: control the opening / closing of each switch, control the discharge and charging of the bidirectional AC / DC power module, test the battery internal resistance, and record the individual cell parameters in real time during capacity testing. Individual cell parameters can be exported after capacity testing is completed. By verifying the discharge test to determine the current capacity of the battery, and by accumulating and quantitatively analyzing the test data, the current battery capacity, its trend, and its lifespan can be inferred.
[0007] In a preferred embodiment, the battery online monitoring and remote capacity assessment device further includes a bus tie contactor. An external charger is connected to an external busbar, which includes an external section I busbar and an external section II busbar. The external section I busbar is connected to the external section II busbar via the bus tie contactor. The control line and status line of the bus tie contactor are connected to the centralized monitoring unit. The centralized monitoring unit controls the opening / closing of the bus tie contactor via the control line of the bus tie contactor, thereby controlling the disconnection and connection of the two external busbar sections. The centralized monitoring unit obtains the opening / closing status of the bus tie contactor via the status line of the bus tie contactor.
[0008] In a preferred embodiment, the battery online monitoring and remote capacity assessment device further includes a battery circuit contactor. The external busbar is connected to an external battery under test via the battery circuit contactor. The control line and status line of the battery circuit contactor are connected to the centralized monitoring unit. The centralized monitoring unit controls the opening / closing of the battery circuit contactor via the control line of the battery circuit contactor, thereby controlling the disconnection and connection between the external busbar and the external battery under test. The centralized monitoring unit obtains the opening / closing status of the bus tie contactor via the status line of the battery circuit contactor.
[0009] In a preferred embodiment, the battery online monitoring and remote capacity assessment device further includes an isolation diode, which is connected in parallel with the battery circuit contactor.
[0010] In a preferred embodiment, the battery online monitoring and remote capacity assessment device further includes a charge / discharge control switch. The DC terminal of the bidirectional AC / DC power module is connected to the DC current acquisition unit and the external battery under test via the charge / discharge control switch. The control line and status line of the charge / discharge control switch are connected to the centralized monitoring unit. The centralized monitoring unit controls the opening / closing of the charge / discharge control switch via the control line, thereby controlling the disconnection and connection between the AC / DC power module and the external battery under test. The centralized monitoring unit obtains the opening / closing status of the charge / discharge control switch via the status line.
[0011] In a preferred embodiment, the battery online monitoring and remote capacity assessment device further includes a communication module, through which external backend software interacts with the centralized monitoring unit. Attached Figure Description
[0012] Figure 1 This is a system block diagram of this utility model;
[0013] Figure 2 This is a system schematic diagram of this utility model. Detailed Implementation
[0014] like Figures 1 to 2 As shown, in this embodiment, the present invention includes a centralized monitoring unit 2, a DC voltage acquisition unit 4, and a DC current acquisition unit 5; the centralized monitoring unit 2 is connected to a bidirectional AC / DC power module 6 and a touch screen 7, and the bidirectional AC / DC power module 6 is connected to an external battery 1 under test via the DC current acquisition unit 5.
[0015] The external battery monitoring unit 3 collects information on each battery under test 1, such as individual cell voltage, temperature, and internal resistance. The collected data is then transmitted to the centralized monitoring unit 2 via isolated communication. The external battery monitoring unit 3 can also measure the resistance of the connecting strip to determine if the connecting strip is loose or abnormal, thereby promptly alerting the system that it cannot perform capacity verification operations.
[0016] The DC voltage acquisition unit 4 collects the total voltage of the battery under test 1, the voltage of the two bus sections, and the DC voltage of the bidirectional AC / DC power module 6 during charging / discharging in real time. The collected data is then sent to the centralized monitoring unit 2 via RS485.
[0017] The DC current acquisition unit 5 acquires the charging / discharging current of the battery under test 1 and the DC current of the bidirectional AC / DC power module 6 during charging / discharging in real time. The acquired data is then sent to the centralized monitoring unit 2 via RS485.
[0018] The bidirectional AC / DC power module 6 realizes bidirectional conversion between AC and DC, integrating charging and discharging functions into one. By controlling this module, the external battery under test 1 can be charged / discharged.
[0019] The centralized monitoring unit 2 establishes communication connections with each unit via RS485 and CAN bus, controlling and setting parameters for each unit, and collecting, analyzing, and storing data from each unit. It monitors in real-time the status of each switch, battery pack voltage, charging / discharging current, voltage of both DC bus sections, individual battery operating parameters, and three-phase AC voltage and current, while also saving real-time operation records and alarm records. For example, data analysis from the external battery monitoring unit 3 can identify faulty batteries. Faulty factors include: internal resistance exceeding the reference range, voltage value differing significantly from the average voltage value, abnormal temperature, and connection strip resistance exceeding the reference range. By controlling the bidirectional AC / DC power module 6 to discharge the external battery under test 1, the real-time collected discharge current and discharge time can be used to calculate the battery discharge capacity, which is then used to calculate the battery's current state and lifespan.
[0020] The centralized monitoring unit 2 has the following characteristics:
[0021] 1. GPS time synchronization (IRIG-B) interface, time synchronization accuracy 1ms;
[0022] 2. Eight communication interfaces: one isolated CAN interface for communication with the bidirectional AC / DC power module 6, five isolated RS485 interfaces for communication with each acquisition unit, and two isolated RS485 interfaces for communication with the 61850 communication module (or host computer software).
[0023] 3. Eight active input contacts (12V) can be used to collect switch status signals and external alarm signals;
[0024] 4. 15 output contacts, one of which is a normally closed output contact, which can be used to output switch control signals and alarm signals;
[0025] 5. Power indicator light, running indicator light, communication indicator light, alarm indicator light and alarm sound;
[0026] 6. It can save up to 1024 alarm records and 1024 operation records;
[0027] 7. One three-phase AC voltage interface and one three-phase AC current interface, which can be used to detect three-phase AC voltage and current;
[0028] 8. Optional USB interface and TF card interface.
[0029] The touch screen 7 communicates with the centralized monitoring unit 2 in real time via RS232, acquiring data collected by the centralized monitoring unit 2, such as abnormal battery status records, discharge data, and data from each battery cell, and displays and saves the data in real time. Data can be retrieved using a USB storage device for manual analysis. Operators can view data collected by each unit, system operation records, system alarm records, and current alarm information through the touch screen 7; they can also perform a series of control operations: parameter settings, switching on / off control of each switch, charging / discharging control of the bidirectional AC / DC power module 6, enabling / disabling automatic capacity verification, and battery internal resistance testing, etc.
[0030] like Figures 1 to 2 As shown, in this embodiment, the battery online monitoring and remote capacity assessment device also includes a bus tie contactor 9, and an external busbar 8 including an external section I busbar and an external section II busbar. The external No. 1 charger is connected to the external section I busbar, and the external section I busbar is connected to the external section II busbar via the bus tie contactor 9.
[0031] The bus tie contactor 9 is a normally open 220V DC contactor. An interlock control circuit is established between the bus tie contactor 9 and the battery circuit contactor 10, and it can recover its original state tens of milliseconds before the battery circuit contactor 10. When the first group of external batteries under test 1 is being tested, the first group of external batteries under test 1 is disconnected from the external section I bus. The bus tie contactor 9 is in the closed state, connecting the external section I bus and the external section II bus 8, so that the second group of external batteries under test 1 is connected to the external section I bus, ensuring that at least one group of external batteries under test 1 is always in a standby power state during the capacity testing.
[0032] like Figures 1 to 2As shown, in this embodiment, the battery online monitoring and remote capacity assessment device further includes a battery circuit contactor 10. The external busbar 8 is connected to the battery under test 1 via the battery circuit contactor 10. The control line and status line of the battery circuit contactor 10 are connected to the centralized monitoring unit 2.
[0033] The battery circuit contactor 10 is a normally closed 220V DC contactor, which is in the open state during capacity testing, disconnecting the battery under test 1 from the external bus 8. This ensures that the device can charge / discharge a group of batteries under test 1 independently. The specially selected normally closed contactor ensures that if an abnormal fault occurs during capacity testing and the centralized monitoring unit 2 cannot control the battery circuit contactor 10, the contactor 10 can be promptly restored to the closed state, allowing the external battery under test 1 to be promptly returned to the external bus 8.
[0034] like Figures 1 to 2 As shown, in this embodiment, the battery online monitoring and remote capacity assessment device further includes an isolation diode 11, which is connected in parallel with the battery circuit contactor 10.
[0035] The isolation diode 11 can ensure that the external battery under test 1, which is being tested and undergoing capacity verification, can be switched back to the external bus 8 for power supply in a timely manner when the external bus 8 loses voltage, so as to ensure that the power system will not be affected by the device encountering a fault, that is, the external battery under test 1, which is being tested and undergoing capacity verification, will not completely exit its backup power state.
[0036] like Figures 1 to 2 As shown, in this embodiment, the battery online monitoring and remote capacity assessment device further includes a charge / discharge control switch 12, and the bidirectional AC / DC power module 6 is connected to the battery under test 1 via the charge / discharge control switch 12.
[0037] The charge / discharge control switch 12 is a dedicated 220V DC live-operated circuit breaker. Under normal operating conditions, it is closed, connecting the bidirectional AC / DC power module 6 to the charging / discharging circuit of the battery under test 1. When an alarm occurs, the centralized monitoring unit 2 will control the charge / discharge control switch 12 to open, preventing the bidirectional AC / DC power module 6 from charging / discharging the battery under test 1.
[0038] like Figures 1 to 2As shown, in this embodiment, the battery online monitoring and remote capacity assessment device further includes a communication module 13. External backend software connects to the communication module 13 via an Ethernet interface, thereby interacting with the centralized monitoring unit 2. The communication module 13 communicates with the centralized monitoring unit 2 via RS485 using the MODBUS protocol; it also communicates with the backend software via Ethernet using the 61850 protocol, enabling the conversion between the MODBUS and 61850 protocols. This allows the backend software to interact with the centralized monitoring unit 2, thereby achieving remote real-time monitoring of the capacity assessment device's status and control of the device for a series of operations.
[0039] In this embodiment, the control method for the local / remote automatic capacity verification of the battery online monitoring and remote capacity verification device is as follows, taking the capacity verification of the first group of external batteries to be tested as an example:
[0040] 1. Parameter settings: Set the relevant parameters of the battery capacity through the touch screen 7 or the background software: DC system power level 110VDC / 220VDC, number and capacity of batteries, alarm parameters (over / under voltage threshold, overcurrent threshold, internal resistance threshold, temperature threshold, etc.), equalization charge voltage, float charge voltage, charge / discharge current, discharge capacity, discharge duration, discharge stop voltage, charging capacity and charging duration, etc.
[0041] 2. Enable Capacity Control: The current bus voltage, battery pack voltage, individual cell internal resistance, voltage, temperature, and communication of each unit of the capacity control system are all normal, there are no alarms and no battery pack is charging / discharging. You can select to enable capacity control on the touch screen 7 or the background software. After selection and confirmation, the centralized monitoring unit 2 will sequentially disconnect the first group of battery circuit contactors 10, close the bus tie contactor 9, close the first group of charging and discharging control switches 12, and control the bidirectional AC / DC power module 6 to start discharging.
[0042] 3. Discharge End: When the centralized monitoring unit 2 detects that the total voltage of the external test battery 1 drops to the discharge stop voltage, the voltage of a single cell of the external test battery 1 reaches the set value, the discharge time reaches the set value, and the discharge capacity reaches the set value, it will automatically control the bidirectional AC / DC power module 6 to stop discharging. After 5 minutes of discharge stoppage, it will automatically control the bidirectional AC / DC power module 6 to switch to charging mode to charge the first group of external test batteries 1.
[0043] 4. Charging Completion: When the centralized monitoring unit 2 detects that the charging time of the first group of external batteries under test 1 has reached the set value, the charging time has reached the maximum duration of 24 hours, the charging capacity has reached the set value, and the countdown to float charging (0.01C) has reached 3 hours, it will automatically control the bidirectional AC / DC power module 6 to stop charging. 10 minutes after charging stops, it will automatically send a command to the first group of external battery monitoring unit 3 to start the battery internal resistance test. The completion of the internal resistance test means that the capacity verification is completed.
[0044] 5. Capacity verification complete: The centralized monitoring unit 2 automatically disconnects the first group of charge / discharge control switches 12, disconnects the bus tie contactor 9, and closes the first group of battery circuit contactors 10 in sequence, restoring the system to normal operation. Operators can use a USB flash drive to extract the capacity verification data, such as battery pack voltage, individual cell voltage, internal resistance, temperature, and connecting strip internal resistance, or export the capacity verification data from the background software for analyzing the current battery status.
[0045] 6. Capacity Approval Failure: During the capacity approval process, if the system experiences abnormal alarms such as abnormal bus voltage, battery pack voltage, individual cell internal resistance, voltage, temperature, or communication interruptions between units, the centralized monitoring unit 2 will issue an alarm prompt, record the alarm cause and save the alarm record, and automatically control the bidirectional AC / DC power module 6 to stop discharging, disconnect the first set of charge / discharge control switches 12, and wait for the operator to investigate and clear the alarm. After clearing the alarm, the operator can choose to continue capacity approval or reset the switches. If the first set of charge / discharge control switches 12 are closed sequentially to control the bidirectional AC / DC power module 6 to discharge (or charge), capacity approval will continue. If a switch reset is selected, the centralized monitoring unit 2 will automatically disconnect the first set of charge / discharge control switches 12, disconnect the bus tie contactor 9, and close the first set of battery circuit contactors 10 in sequence, and the system will return to normal operation.
[0046] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.
Claims
1. A battery online monitoring and remote capacity assessment device, comprising a centralized monitoring unit (2), characterized in that: The battery online monitoring and remote capacity assessment device also includes a DC voltage acquisition unit (4) and a DC current acquisition unit (5); the centralized monitoring unit (2) is connected to a bidirectional AC / DC power module (6) and a touch screen (7). The DC terminal of the bidirectional AC / DC power module (6) is connected to an external battery under test (1) via the DC current acquisition unit (5). The AC terminal of the bidirectional AC / DC power module (6) is connected to an external three-phase AC power supply. The CAN communication interface of the bidirectional AC / DC power module (6) is connected to the centralized monitoring unit (2). The centralized monitoring unit (2) is connected to an external battery monitoring unit (3) via an RS485 communication interface. The DC voltage acquisition unit (4) is connected to the positive and negative terminals of the external battery under test (1), the positive and negative terminals of the external bus (8), and the positive and negative terminals of the DC terminal of the AC / DC power module (6). The DC current acquisition unit (5) is connected to the positive terminal of the external battery under test (1).
2. The battery online monitoring and remote capacity assessment device according to claim 1, characterized in that: The battery online monitoring and remote capacity assessment device also includes a bus tie contactor (9), an external charger connected to an external bus (8), the external bus (8) includes an external section I bus and an external section II bus, the external section I bus is connected to the external section II bus via the bus tie contactor (9), and the control line and status line of the bus tie contactor (9) are connected to the centralized monitoring unit (2).
3. The battery online monitoring and remote capacity assessment device according to claim 2, characterized in that: The battery online monitoring and remote capacity assessment device also includes a battery circuit contactor (10). The external bus (8) is connected to the external battery under test (1) via the battery circuit contactor (10). The control line and status line of the battery circuit contactor (10) are connected to the centralized monitoring unit (2).
4. The battery online monitoring and remote capacity assessment device according to claim 3, characterized in that: The battery online monitoring and remote capacity assessment device also includes an isolation diode (11), which is connected in parallel with the battery circuit contactor (10).
5. The battery online monitoring and remote capacity assessment device according to claim 1, characterized in that: The battery online monitoring and remote capacity assessment device also includes a charge / discharge control switch (12), and the bidirectional AC / DC power module (6) is connected to the DC current acquisition unit (5) and the external battery under test (1) via the charge / discharge control switch (12).
6. The battery online monitoring and remote capacity assessment device according to claim 1, characterized in that: The battery online monitoring and remote capacity assessment device also includes a communication module (13), through which the external backend software interacts with the centralized monitoring unit (2).