Power distribution terminal storage battery undervoltage on-line monitoring device

Abstract

The utility model provides a power distribution terminal storage battery undervoltage on-line monitoring device, which belongs to the technical field of power supply undervoltage monitoring and comprises a main control unit, a user power supply control unit, a man-machine interaction unit, a monitoring unit, an open circuit control unit, a working power supply unit and a dry contact output unit. The user power supply control unit is used for being electrically connected with a battery activation interface of a power distribution terminal user power supply, one connecting terminal of the open circuit control unit is electrically connected with a B + end of the power distribution terminal user power supply, and the other connecting terminal of the open circuit control unit is electrically connected with a positive electrode of a storage battery to be tested. The negative electrode of the storage battery is electrically connected with the B-end of the power distribution terminal user power supply, the monitoring unit is electrically connected with the two electrodes of the storage battery, the open circuit control unit is used for controlling the offline and online states of the storage battery, and the monitoring unit is used for monitoring the voltage and current of the storage battery in real time; and the user power supply control unit is used for controlling the battery activation interface to start a discharge nuclear capacity test of the storage battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply undervoltage monitoring, and in particular relates to an online monitoring device for undervoltage of a storage battery at a power distribution terminal. Background Art

[0002] The backup power supply of distribution automation terminals is crucial in the distribution automation system. The distribution terminal must be able to maintain operation for a period of time when the line loses power to complete a series of tasks such as fault detection, information reporting, and remote control of switches, so as to quickly locate the fault, isolate it, and restore power supply to non-faulty areas. Therefore, the configuration mode of the backup power supply of distribution automation terminals has become an important issue that must be studied and solved in the construction of distribution automation. Due to the wide distribution of distribution terminals, the environment in which their backup power supply batteries are located is harsh and lacks maintenance. The batteries often swell, the terminals rust, and the acid corrosion occurs. They cannot be discovered and replaced in time, and there are a lot of hidden dangers in the distribution system. The battery pack of the distribution terminal is often in an undervoltage state due to untimely maintenance. When the main power supply fails, it cannot provide emergency power supply and the switch closing operation cannot be completed, affecting the surrounding life and production electricity. When the battery pack is in the floating charge state, even if the voltage of the entire battery terminal is normal, there may be individual lagging cells. The existing online monitoring device for undervoltage of the battery at the distribution terminal can only detect the problem of the battery by offline testing, and it is necessary to disconnect the online state of the battery for a long time for monitoring, which affects the use of the battery at the distribution terminal. Utility Model Content

[0003] In view of this, the utility model provides an online monitoring device for undervoltage of batteries in distribution terminals, which can solve the problem that the existing online monitoring device for undervoltage of batteries in distribution terminals can only detect and monitor the batteries through offline testing, and the online status of the batteries needs to be disconnected for a long time for monitoring, which affects the technical problem of using the batteries in the distribution terminals.

[0004] The utility model is achieved in this way:

[0005] The utility model provides an online monitoring device for undervoltage of storage battery at a power distribution terminal, which comprises a main control unit, a user power control unit, a human-computer interaction unit, a monitoring unit, an open circuit control unit, a working power supply unit, and a dry contact output unit. The main control unit is electrically connected to the user power control unit, the human-computer interaction unit, the monitoring unit, the open circuit control unit, and the dry contact output unit. The working power supply unit is electrically connected to the main control unit, the user power control unit, the human-computer interaction unit, the open circuit control unit, and the dry contact output unit and provides electric energy. The user power control unit is used to activate the battery of the user power supply of the power distribution terminal. The open circuit control unit is electrically connected to the positive input B+ terminal of the user power supply of the power distribution terminal, the other connection terminal of the open circuit control unit is electrically connected to the positive electrode of the battery to be tested, the negative electrode of the battery is electrically connected to the negative input B- terminal of the user power supply of the power distribution terminal, the monitoring unit is electrically connected to the two poles of the battery, the open circuit control unit is used to control the offline and online states of the battery, and the monitoring unit is used to monitor the voltage and current of the battery in real time; the user power control unit is used to control the battery activation interface to start the discharge core capacity test of the battery.

[0006] On the basis of the above technical solution, the utility model of a distribution terminal battery undervoltage online monitoring device can also be improved as follows:

[0007] Wherein, the human-computer interaction unit includes a keyboard and a display screen.

[0008] Furthermore, the display screen is an LED display screen.

[0009] Wherein, the battery is a multi-cell battery, and the monitoring unit is also used to monitor the voltage of a single cell of the multi-cell battery in real time.

[0010] It also includes a data storage unit, which is electrically connected to the main control unit and the working power supply unit and is used to store and record the data collected by the monitoring unit.

[0011] It also includes a communication unit which adopts RS485 protocol to provide remote communication function.

[0012] The open circuit control unit includes a normally closed contactor and a diode, the two poles of the normally closed contactor are electrically connected to the two poles of the diode, and the two poles of the open circuit control unit are the two poles of the diode.

[0013] Wherein, the output of the working power supply unit is 12V.

[0014] Wherein, the dry contact output unit is composed of a plurality of optical coupling relays, which is used to control the dry contact signal to output an alarm signal and is used to connect an alarm device.

[0015] Compared with the prior art, the utility model provides a distribution terminal battery undervoltage online monitoring device with the beneficial effect of: on the basis of the battery power management module, by designing a controllable disconnection point between the battery and the charger, open circuit voltage detection is performed. The distribution terminal battery undervoltage online monitoring device realizes voltage monitoring of the battery group in the open circuit state, and records the dynamic changes of the battery voltage at the same time, analyzes the battery changes, timely discovers the undervoltage state of the battery, and determines the backward hidden danger battery, which solves the problem that the existing distribution terminal battery undervoltage online monitoring device can only detect and monitor the battery through offline testing, and needs to disconnect the online state of the battery for a long time for monitoring, which affects the technical problem of using the distribution terminal battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A composition diagram of the device provided by the utility model;

[0018] Figure 2 This is the circuit diagram for monitoring the open circuit voltage of the battery;

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. On-line monitoring device for battery undervoltage at distribution terminal; 101. Main control unit; 102. User power control unit; 103. Human-computer interaction unit; 104. Monitoring unit; 105. Open circuit control unit; 106. Working power unit; 107. Data storage unit; 108. Communication unit; 109. Dry contact output unit; 2. User power supply at distribution terminal; 201. Battery activation interface; D1. Diode; K1. Normally closed contactor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the implementation mode of the present invention clearer, the technical solution in the implementation mode of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation mode of the present invention.

[0022] like Figure 1As shown, it is a schematic diagram of the composition of an online monitoring device for undervoltage of a battery in a power distribution terminal provided by the utility model, the device comprises a main control unit 101, a user power control unit 102, a human-computer interaction unit 103, a monitoring unit 104, an open circuit control unit 105, a working power supply unit 106, and a dry contact output unit 109. The main control unit 101 is electrically connected to the user power control unit 102, the human-computer interaction unit 103, the monitoring unit 104, the open circuit control unit 105, and the dry contact output unit 109, and the working power supply unit 106 is electrically connected to the main control unit 101, the user power control unit 102, the human-computer interaction unit 103, the open circuit control unit 105, and the dry contact output unit 109 and provides electrical The user power control unit 102 is used to be electrically connected to the battery activation interface 201 of the user power 2 of the distribution terminal, one connection terminal of the open circuit control unit 105 is electrically connected to the positive input B+ terminal of the user power 2 of the distribution terminal, the other connection terminal of the open circuit control unit 105 is electrically connected to the positive electrode of the battery to be tested, the negative electrode of the battery is electrically connected to the negative input B- terminal of the user power 2 of the distribution terminal, the monitoring unit 104 is electrically connected to the two poles of the battery, the open circuit control unit 105 is used to control the offline and online states of the battery, and the monitoring unit 104 is used to monitor the voltage and current of the battery in real time; the user power control unit 102 is used to control the battery activation interface 201 to start the discharge nuclear capacity test of the battery.

[0023] Among them, in the above technical solution, the human-computer interaction unit 103 includes a keyboard and a display screen.

[0024] Furthermore, in the above technical solution, the display screen is an LED display screen.

[0025] In the above technical solution, the battery is a plurality of batteries, and the monitoring unit 104 is also used to monitor the voltage of a single battery in the plurality of batteries in real time, for example, a small BMS battery management system.

[0026] The above technical solution further includes a data storage unit 107 , which is electrically connected to the main control unit 101 and the working power supply unit 106 and is used for storing and recording the data collected by the monitoring unit 104 .

[0027] Among them, in the above technical solution, it also includes a communication unit 108, which adopts RS485 protocol to provide remote communication function.

[0028] In the above technical solution, the open circuit control unit 105 includes a normally closed contactor K1 and a diode D1, the two poles of the normally closed contactor K1 are electrically connected to the two poles of the diode D1, and the two poles of the open circuit control unit 105 are the two poles of the diode D1.

[0029] Among them, in the above technical solution, the output of the working power supply unit 106 is 12V.

[0030] Among them, in the above technical solution, the dry contact output unit 109 is composed of a number of optical coupling relays, which are used to control the dry contact signal to output the alarm signal and are used to connect the alarm device.

[0031] Specifically: The above-mentioned units are described as follows:

[0032] The main control unit 101 is composed of a micro control unit MCU.

[0033] The user triggers the control button, triggering the main control unit 101 MCU signal, and the user power control unit 102 responds: controls the drive circuit composed of transistors, drives the relay coil, controls the relay contacts to close or open, the relay contacts are passive signals, connect to the battery activation interface of the user power supply, and control the power supply to enter or exit battery activation (the relay contact capacity is ac125V0.5A, dc30V 2A).

[0034] The human-computer interaction unit 103 is composed of a liquid crystal display screen and buttons.

[0035] The monitoring unit 104 is composed of a battery voltage acquisition circuit and a current acquisition circuit; the voltage acquisition circuit uses an optical isolation device to work in time-sharing mode to connect the voltage signal of a single battery to a conditioning circuit with an operational amplifier as the core device, and the conditioning circuit outputs to the ADC (analog-to-digital) interface of the MCU to achieve sampling of each battery in the battery pack; the current acquisition circuit uses a sensor chip using the Hall principle to convert the battery current signal into a voltage signal, and the voltage signal is then connected to the conditioning circuit with an operational amplifier as the core device, and the conditioning circuit outputs to the ADC (analog-to-digital) interface of the MCU to achieve battery pack current sampling.

[0036] The open circuit control unit 105 is composed of a normally closed relay (the contact is normally closed) connected in series to the positive electrode of the battery pack and a diode connected in parallel to both ends of the relay contact. When no driving signal is applied to the relay, the battery pack is directly connected to the user power supply through the normally closed contact. When the user activates the open circuit test function, the main control unit 101 generates a trigger driving signal to control the driving circuit composed of a transistor, etc., drives the relay coil, and triggers the relay contact to operate (the contact is disconnected). At this time, the battery pack and the user power supply are only connected by a diode (with a unidirectional conduction characteristic). When the power supply is working normally, the battery is in a state of neither charging nor discharging. When the power supply is abnormal and the output voltage is lost, the battery will immediately supply power through the diode to ensure uninterrupted power supply to the user's load.

[0037] The working power supply unit 106 uses a power supply with an input range of DC17.5-35V to isolate and transform it into a 12V, 5V or other power supply required by the device, and has functions such as reverse connection protection and short circuit protection.

[0038] The data storage unit 107 is composed of a data storage Flash chip.

[0039] The communication unit 108 is composed of an RS485 communication circuit.

[0040] The functions of the above circuit modules are described as follows:

[0041] The working power supply unit 106 provides working power for the entire device system.

[0042] The main control unit 101 sends instructions to control the start / stop of all peripheral circuits or units connected to it and related to it.

[0043] The user power control unit 102 can send instructions to the battery activation interface 201 of the power distribution terminal user power 2 to start the discharge of the battery.

[0044] The human-computer interaction unit 103 provides human-computer interaction functions such as key operation and display screen display.

[0045] The monitoring unit 104 monitors the terminal voltage, terminal current, and voltage of a single battery of the battery pack in real time.

[0046] The open circuit control unit 105 can control the battery pack to open the circuit offline and restore the circuit online.

[0047] The data storage unit 107 is used to store and record the real-time data of the battery collected by the monitoring unit 104 .

[0048] The communication unit 108 adopts RS485 protocol, provides remote communication function, directly sends remote signal and telemetry data to the management system of the power distribution terminal, and can remotely control open circuit voltage monitoring and nuclear capacity testing.

[0049] The dry contact output unit 109 can output the dry contact signal to other associated devices.

[0050] like Figure 1 As shown, when monitoring the open circuit voltage, the main control unit 101 receives the button start triggered by the user, and sends a corresponding instruction to the open circuit control unit 105, which controls the battery pack to be disconnected from the power distribution terminal user power supply 2. At this time, the battery pack exits the floating charge state and enters the open circuit state; in this state, the user can further trigger the button to display the parameters, and the battery voltage monitored by the monitoring unit 104 in real time is the voltage in the open circuit state. Figure 2 As shown, when monitoring the battery open circuit voltage, the normally closed contactor K1 inside the open circuit control unit 105 is disconnected, the battery is open circuited and offline, and the monitoring unit 104 detects the battery voltage and the health of the battery in real time. When the city power is cut off or the power fails, the battery pack can supply power to the load without delay through the characteristics of the D1 diode inside the open circuit control unit 105, ensuring system safety, and monitoring the power supply voltage in real time during this process.

[0051] The power distribution terminal user power supply 2 has the function of battery activation. Figure 2 As shown, when the user triggers the button to disconnect the battery from the load, the user power control unit 102 is connected to the battery activation interface 201, and the capacity button is pressed to start the battery capacity discharge test. During the process of the battery discharging to the outside, the monitoring unit 104 monitors the current and voltage of the battery pack in real time. The discharge capacity is recorded, and the drop in the voltage of a single battery is recorded during the discharge process. After the discharge is completed, the capacity of the battery is calculated according to the relevant algorithm, and the battery life is estimated.

[0052] like Figure 1 As shown, the communication unit 108 adopts RS485 protocol, can communicate with the remote management platform, receive remote instructions, remotely set parameters, and start battery open circuit voltage detection or core capacity discharge test.

[0053] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. An online monitoring device for battery undervoltage at a power distribution terminal, characterized in that: It includes main control unit, user power control unit, human-computer interaction unit, monitoring unit, open circuit control unit, working power supply unit, dry contact output unit, The main control unit is electrically connected to the user power control unit, the human-computer interaction unit, the monitoring unit, the open circuit control unit, and the dry contact output unit; the working power supply unit is electrically connected to the main control unit, the user power control unit, the human-computer interaction unit, the open circuit control unit, and the dry contact output unit and provides electrical energy; the user power control unit is used to be electrically connected to the battery activation interface of the user power supply of the power distribution terminal; one connecting terminal of the open circuit control unit is electrically connected to the positive input B+ terminal of the user power supply of the power distribution terminal; another connecting terminal of the open circuit control unit is electrically connected to the positive electrode of the battery to be tested; the negative electrode of the battery is electrically connected to the negative input B- terminal of the user power supply of the power distribution terminal; the monitoring unit is electrically connected to the two poles of the battery; the open circuit control unit is used to control the offline and online states of the battery; the monitoring unit is used to monitor the voltage and current of the battery in real time; the user power control unit is used to control the battery activation interface to start the discharge capacity test of the battery.

2. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: The human-computer interaction unit includes buttons and a display screen.

3. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 2, characterized in that: The display screen is an LED display screen.

4. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: The storage battery is a multi-cell storage battery, and the monitoring unit is also used to monitor the voltage of a single cell of the multi-cell storage battery in real time.

5. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: It also includes a data storage unit, which is electrically connected to the main control unit and the working power supply unit and is used to store and record the data collected by the monitoring unit.

6. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: It also includes a communication unit, which adopts RS485 protocol to provide remote communication function.

7. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: The open circuit control unit includes a normally closed contactor and a diode. The two poles of the normally closed contactor are electrically connected to the two poles of the diode. The two poles of the open circuit control unit are the two poles of the diode.

8. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: The output of the working power supply unit is 12V.

9. The device for online monitoring of battery undervoltage at a power distribution terminal according to claim 1, characterized in that: The dry contact output unit is composed of a plurality of optical coupling relays, which are used to control the dry contact signal to output an alarm signal and are used to connect an alarm device.

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