Storage battery open circuit follow current device

Abstract

The utility model discloses a storage battery open circuit freewheeling device, which comprises a storage battery pack connected in series, and a freewheeling circuit device is connected and arranged at the positive electrode and the negative electrode of each single battery of the storage battery pack through a lead; the follow current circuit device further comprises a follow current circuit device wiring terminal, a switch controller wiring terminal, a switch controller power supply wiring terminal, a control line plug and an expansion terminal. A voltmeter, a high-current diode connected in series with a K1 switch and an open circuit with a K2 switch are arranged in parallel at two ends of a wiring end of the follow current circuit; the action power supply ends of the switch K1 and the switch K2 are connected to the power supply terminal of the switch controller through wires; the K1 switch is connected to the terminal of the switch controller, and the terminal of the switch controller is electrically connected to the display controller through a wire.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an open-circuit continuous current device for storage batteries. Background Art

[0002] Intelligent valve-regulated lead-acid batteries are widely used as emergency backup power supplies in DC systems in substations due to their advantages such as safety, stability, small floor area, and no need for liquid addition. However, statistical research on the operation of battery packs shows that due to the quality problems of the equipment itself and untimely and incomplete operation and maintenance, most domestic batteries will have defects and there is a risk of open circuit after running for 5 to 7 years.

[0003] With the rapid development of China's power industry in recent years, the number of substations and battery packs has been increasing at a rate of more than 15% per year. At the same time, the distance between substations and the management units of power supply companies is getting farther and farther, and most substations are basically unmanned. The DC system provides power for the control system, relay protection, signal device, and automatic device in the substation. Therefore, the DC power supply should have high reliability and stability. Thus, how to maintain the battery pack in a timely manner has become a thorny problem in the power system.

[0004] In the prior art, the battery pack of the DC power supply system in the substation is composed of multiple 2V batteries connected in series. When any one of the batteries has an open circuit or a fault, it will, in the lightest case, affect the service life of the entire battery pack, and in the worst case, the entire battery pack will be disconnected, unable to provide DC power for the substation control equipment, resulting in power loss of the equipment and out-of-control of the control loop. There have been many accidents caused by DC system power outages in the power system, seriously threatening the safe and stable operation of the power system.

[0005] At present, the operation and maintenance of the substation battery pack mainly rely on measuring parameters such as the terminal voltage, internal resistance, and temperature of the battery through test instruments and analyzing and judging to determine the quality of the battery. Generally, the DC power supply is disconnected, the standby battery is connected to the charger, and then the battery to be replaced is withdrawn to ensure the normal operation of the entire battery pack. However, this regular maintenance and inspection of the battery pack is very time-consuming and laborious, and it is impossible to timely detect the open circuit and faults of the battery during the inspection period. Especially when a single battery has an open circuit, the problem that the battery pack cannot continue to provide working current for the load leads to a DC system power outage, reducing the stability and reliability of the substation operation. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an open-circuit continuous current device for storage batteries.

[0007] The object of the present utility model is achieved through the following technical solutions: A battery open-circuit current continuation device includes a series-connected battery pack, and a current continuation circuit breaker is arranged by connecting the positive and negative electrodes of each single battery in the battery pack through wires; the current continuation circuit breaker further includes a current continuation circuit breaker terminal, a switch controller terminal, a switch controller power supply terminal, a control line plug, and an extension terminal; a voltmeter is arranged in parallel at both ends of the current continuation circuit breaker terminal, a large-current diode in series with a K1 switch and an open-circuit circuit with a K2 switch are connected in series; the power supply terminals of the actions of the K1 switch and the K2 switch are connected to the switch controller power supply terminal through wires; the K1 switch is electrically connected to the switch controller terminal, and the switch controller terminal is electrically connected to the display controller through wires.

[0008] Optionally, a device power supply is arranged by connecting the positive and negative electrodes of the battery pack through wires, the device power supply is connected to a No. 1 switch power supply through wires, and the No. 1 switch power supply is connected to the switch controller power supply terminal through wires.

[0009] Optionally, an AC power supply terminal is arranged in the current continuation circuit breaker, and the AC power supply terminal is connected to an AC power supply through wires.

[0010] Optionally, a control line connection socket is arranged at the switch controller terminal, a control line plug is inserted in the control line connection socket, and the control line plug is connected to the display controller through wires.

[0011] Optionally, a No. 2 switch power supply is connected in parallel to the No. 1 switch power supply, and a temperature relay and a fan are connected in series through wires to the No. 2 switch power supply.

[0012] Optionally, an LED lamp is arranged by connecting through a triode at both ends of the current continuation circuit breaker terminal.

[0013] The present utility model has the following advantages: When the capacity of an individual battery is depleted (or the battery is open-circuited), this device can add a high-power diode circuit at both ends of the battery, and can transfer the capacity of a battery with a higher capacity to a battery with a poorer capacity through the technology of power transfer (or establish a virtual battery to replace the open-circuited battery), thereby improving the capacity consistency of the battery pack, extending the discharge time of the battery pack, ensuring the effective supply of the DC power supply, improving the stability and reliability of the DC system, and further improving the safety and reliability of the substation, and can be widely applied to the DC system of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic connection structure diagram.

[0015] Figure 2 It is a schematic diagram of the current continuation circuit structure Figure 1 。

[0016] Figure 3 Schematic diagram of the freewheeling circuit structure Figure 2 。

[0017] Figure 4 This is the specific on-site wiring diagram of the present utility model.

[0018] In the figure, there are battery pack (1), main circuit switch (2), freewheeling circuit breaker (3), display controller (4), AC power supply (5), device power supply (6), No. 1 switching power supply (7), No. 2 switching power supply (8), temperature relay (9), fan (10), freewheeling circuit breaker terminal (11), switch controller terminal (12), switch controller power supply terminal (13), control line plug (14), and extension terminal (15). Specific embodiments

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0021] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0022] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] As Figure 1 shown, a battery open-circuit freewheeling device includes a series-connected battery pack 1. The battery pack 1 is used in series during use. In this device, a freewheeling circuit breaker 3 is connected and arranged through wires at the positive and negative electrodes of each single battery of the battery pack 1; specifically, the freewheeling circuit breaker 3 is a sealed container, and a corresponding circuit board is placed and arranged inside the container, and corresponding electrical components are soldered on the circuit board to form a freewheeling circuit. In this device, the freewheeling circuit breaker 3 also includes a freewheeling circuit breaker terminal 11, a switch controller terminal 12, a switch controller power supply terminal 13, a control line plug 14, and an extension terminal 15. Specifically, as Figure 2 shown, a voltmeter is connected in parallel at both ends of the freewheeling circuit breaker terminal 11, a large-current diode in series with a K1 switch and an open-circuit circuit with a K2 switch are connected in series; a total of three branches are formed, among which, the Figure 3The left terminal on the middle is the negative electrode, which is connected to the negative electrode of the battery to be replaced. For the convenience of operation, it is generally necessary to connect to the positive electrode of the adjacent battery, clamp the connection pliers on the corresponding copper column, and ensure reliable connection. The switches K1 and K2 are used to select whether to connect the diode in series. After K2 is closed, the diode will be automatically shielded, and the positive and negative sides of the freewheeling circuit breaker are in a short-circuit state. The voltmeter V is used to indicate the voltage between the positive and negative terminals, and the range is 1V~±15V. When disassembling and assembling the battery, the diode not only ensures the normal operation of the battery pack, but also prevents the short-circuit discharge of the faulty battery. When in use, it is not necessary to withdraw the battery pack in operation, and the single-cell deteriorated battery can be replaced online. At the same time, it is compatible with single cells of 2V, 6V, and 12V. For the normal use and operation of this device, the switches of this device adopt battery coil switches that are convenient to control. The power supply terminals of the actions of the switches K1 and K2 are connected to the power supply terminal 13 of the switch controller through wires. The power supply terminal 13 of the switch controller provides control power for the actions of the switches. The electrical signals of the switches K1 and K2 are connected to the terminal 12 of the switch controller, and the terminal 12 of the switch controller is electrically connected to the display controller 4 through wires. In this way, the coils of the switches K1 and K2 obtain the power for action through the power supply terminal 13 of the switch controller, and then are uniformly controlled by the display controller 4.

[0026] This device is used in parallel with multiple units at the same time. When a certain battery in the battery pack 1 fails, the voltmeter of this device can immediately detect a large change in the voltage across the faulty battery, or even a direct open circuit causing a power change. At this time, the battery is open-circuited, and the circuit conducts and freewheels through the diode. When the staff checks, they can find that the battery pack is abnormal. In this way, maintenance or replacement operations can be carried out. During the operation, whether to turn on the switch K2 to shield the diode can be selected according to needs.

[0027] As an option, for the convenience of powering the entire device, this device actually has two power supplies. One is to set up a device power supply 6 by connecting the positive and negative electrodes of the battery pack 1 through wires. The device power supply 6 is connected to the No. 1 switch power supply 7 through wires. The No. 1 switch power supply 7 is connected to the power supply terminal 13 of the switch controller through wires and is also connected to the power supply terminal of the display controller 4. The other is to directly set up an AC power supply terminal 16 in the freewheeling circuit breaker 3. The AC power supply terminal 16 is connected to the AC power supply 5 through wires. In this way, it can be ensured that the device will not lose power in most cases.

[0028] As an option, for the convenience of plugging and using this device, a control wire connection socket is provided at the terminal 12 of the switch controller. A control wire plug 14 is inserted into the control wire connection socket, and the control wire plug 14 is connected to the display controller 4 through wires.

[0029] Optionally, during use, since the device is always in operation, it is inevitable that it will generate heat. Therefore, a second switching power supply 8 is connected in parallel to the first switching power supply 7. A temperature relay 9 and a fan 10 are connected in series through a wire to the second switching power supply 8. When the temperature relay 9 reaches a certain temperature, the circuit conducts to turn on the fan 10 to cool the device.

[0030] Optionally, to conveniently and visually observe the fixed battery pack, as Figure 3 shown, an LED lamp is connected and arranged at both ends of the terminal of the freewheeling circuit breaker 11 through a triode. When the battery pack is working normally, the LED lamp is normally on, and when an abnormality occurs, the LED lamp goes out.

[0031] Optionally, a manual main circuit switch 2 can be set when connecting the battery pack to this device as needed. This facilitates directly disconnecting the entire device from the battery pack during use.

[0032] This device uses a large-current diode as a conducting electrical component, detects and has no delay in bridging and exiting an open-circuit single battery, can replace the battery online, and ensures the uninterrupted normal operation of the battery pack; this large-current and large-margin bridging current design can meet the normal operation when the continuous working current is 100A and the peak working current is 300A; for the bridging action alarm indication, the module is designed with a normal working indicator light to quickly locate the position of the open-circuit battery for maintenance and replacement; through usage records, with an extremely long bridging freewheeling time, the module can meet at least 10 hours of freewheeling operation, winning repair time for operation and maintenance;

[0033] To verify the use of this device for the substation battery pack, this device was installed on the original DC system of a 110kV substation. The specific on-site wiring is as Figure 4 shown:

[0034] 1. In the battery room, a battery pack open-circuit freewheeling device is bridged across each battery. Under normal operation, it plays a monitoring role and does not affect the power supply of the DC system;

[0035] 2. Find a battery with an open-circuit fault and connect it in series in the middle of the battery pack. Bridge the battery pack open-circuit freewheeling device across its two ends. The battery pack still works normally. After removing the self-rescue device, the battery stops working and there is no power output to the outside, verifying that this device can automatically detect the open-circuit fault battery and achieve current bridging to ensure that the battery pack can continuously supply power to the outside, greatly improving the safety and reliability of the DC power supply system;

[0036] 3. When the battery pack open-circuit freewheeling device is bridged across the two ends of the open-circuit fault battery, without disconnecting the DC system switch, according to the bridging action indicator light of the self-rescue device, find the open-circuit fault battery and replace it online. During the whole process, the DC system supplies power normally, ensuring the uninterrupted normal operation of the battery pack.

[0037] When the capacity of an individual battery is depleted (or the battery is open-circuited), a high-power diode circuit can be added across the battery. The technology of power transfer can be used to transfer the capacity of the battery with a higher capacity to the battery with a lower capacity (or establish a virtual battery to replace the open-circuited battery), thereby improving the capacity consistency of the battery pack, extending the discharge time of the battery pack, ensuring the effective supply of the DC power supply, improving the reliability of the DC system, and further enhancing the safety and reliability of the substation. It can be widely applied to the DC system of substations.

[0038] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery open circuit freewheeling device, comprising a battery pack (1) connected in series, characterized in that: A freewheeling circuit device (3) is provided at the positive and negative electrodes of each single battery of the storage battery pack (1) through a wire connection; the freewheeling circuit device (3) further comprises a freewheeling circuit device terminal (11), a switch controller terminal (12), a switch controller power terminal (13), a control line plug (14), and an extension terminal (15); a voltmeter, a high current diode connected in series with a K1 switch, and an open circuit with a K2 switch are provided in parallel at two ends of the freewheeling circuit device terminal (11); the power supply terminals of the K1 switch and the K2 switch are connected to the switch controller power terminal (13) through a wire; the K1 switch is electrically connected to the switch controller terminal (12), and the switch controller terminal (12) is electrically connected to the display controller (4) through a wire.

2. A battery open circuit freewheeling device according to claim 1, characterized in that: A device power supply (6) is connected to the positive and negative electrodes of the storage battery pack (1) via wires, the device power supply (6) is connected to a No. 1 switch power supply (7) via wires, and the No. 1 switch power supply (7) is connected to a switch controller power supply terminal (13) via wires.

3. A battery open circuit freewheeling device according to claim 1, characterized in that: An AC power source terminal (16) is provided in the freewheeling circuit device (3), and the AC power source terminal (16) is connected to the AC power source (5) via a wire.

4. A battery open circuit freewheeling device according to claim 1, characterized in that: A control line connection socket is provided at the switch controller connection terminal (12), a control line plug (14) is inserted into the control line connection socket, and the control line plug (14) is connected to the display controller (4) via a wire.

5. A battery open circuit freewheeling device according to claim 1, characterized in that: A No. 2 switching power supply (8) is connected to the No. 1 switching power supply (7), and a temperature relay (9) and a fan (10) are connected in series to the No. 2 switching power supply (8) through wires.

6. A battery open circuit freewheeling device according to claim 1, characterized in that: LED lamps are arranged at both ends of the freewheeling circuit connection terminal (11) and connected via a triode.

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