Storage battery protection device, bus separation state monitoring method, bus separation state monitoring system and bus separation state monitoring equipment

Abstract

The invention discloses a storage battery protection device, system and device and a storage medium. The device comprises a first charging loop, a second charging loop and a voltage adjusting loop, the first charging loop comprises a first resistor, a first capacitor and a first switch, and the second charging loop comprises a second resistor, a first capacitor and a second switch; the adjusting voltage loop comprises a third switch, a third resistor, the first resistor and a first capacitor. The method can effectively slow down the impact current of the storage battery and improve the running time and running quality of the storage battery; meanwhile, the online state of the storage battery can be accurately measured in real time, and the system safety can be improved. The circuit can be widely applied to the technical field of electronic circuits.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a battery protection device, a busbar disconnection status monitoring method, system and equipment. Background Art

[0002] In the related technology, the battery pack of the DC system is in the floating charge state for a long time. The voltage and current changes in the floating charge state are very small. If the battery is disconnected from the busbar, it is difficult to detect; the existing equipment has current judgment, but the floating charge current is very small and the probability of misjudgment is high; some equipment injects signals for judgment, but the DC system cannot inject signals in real time and can only measure periodically, and the measurement efficiency is not high. Therefore, there are still technical problems that need to be solved in the related technology. Summary of the invention

[0003] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] To this end, one purpose of the embodiments of the present application is to provide a battery protection device, a busbar status monitoring method, system and equipment, which can effectively reduce the battery impact current and improve the battery operating time and operating quality; at the same time, it can also accurately measure the battery online status in real time, thereby improving system safety.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present application includes: a battery protection device, the protection device is connected to the busbar of the DC system, and the device includes:

[0006] a first charging circuit, a second charging circuit and a voltage adjustment circuit; the first charging circuit includes a first resistor, a first capacitor and a first switch, the second charging circuit includes a second resistor, a first capacitor and a second switch; the voltage adjustment circuit includes a third switch, a third resistor, the first resistor and a first capacitor;

[0007] One end of the first switch is connected to one end of the second switch, and one end of the first switch is connected to one of the busbars of the DC system as the first connection end of the protection device; the other end of the first switch is connected to one end of the first resistor; the other end of the second switch and one end of the third switch are connected to one end of the second resistor; the other end of the third switch is connected to one end of the third resistor; the other end of the first resistor and the other end of the second resistor are connected to one end of the first capacitor; the other end of the third resistor is connected to the other end of the first capacitor; the other end of the first capacitor is connected to another busbar of the DC system as the second connection end of the protection device.

[0008] In addition, a battery protection device according to the above embodiment of the present invention may also have the following additional technical features:

[0009] Furthermore, in an embodiment of the present application, the device also includes a discharge circuit; the discharge circuit includes a first diode and the first capacitor; the positive electrode of the first diode is connected to one end of the first capacitor; and the negative electrode of the first diode is connected to one end of the first switch.

[0010] Furthermore, in an embodiment of the present application, a withstand voltage value of the first capacitor is greater than or equal to a bus voltage of the DC system.

[0011] Further, in the embodiment of the present application, the resistance value of the first resistor is greater than the resistance value of the second resistor, or the resistance value of the first resistor is less than the resistance value of the second resistor.

[0012] On the other hand, the embodiment of the present application further provides a method for monitoring the state of a battery being disconnected from a busbar, which is implemented by the battery protection device described above, and the method includes:

[0013] Closing the first switch and the second switch to fully charge the first capacitor and obtaining a first real-time current generated by the battery, a first real-time voltage of the bus, and a second real-time voltage across both ends of the first capacitor;

[0014] When the absolute value of the first real-time current is less than a preset current value, the first switch is opened, the second switch is opened, and the third switch is closed to discharge the first capacitor; when the first capacitor is discharged until the difference between the first real-time voltage and the second real-time voltage is greater than a preset voltage, the third switch is opened, and the second switch or the first switch is closed to charge the first capacitor, and during the charging of the first capacitor, whether there is a real-time current generated by the battery in the charging circuit is monitored, and if not, it is determined that the battery is disconnected from the bus.

[0015] Further, in the embodiment of the present application, closing the first switch and the second switch to fully charge the first capacitor specifically includes:

[0016] When the resistance of the first resistor is greater than the resistance of the second resistor, the first switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the first switch is opened and the second switch is closed to fully charge the first capacitor;

[0017] When the resistance of the first resistor is less than the resistance of the second resistor, the second switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the second switch is opened and the first switch is closed to fully charge the first capacitor.

[0018] Furthermore, in the embodiment of the present application, the method further includes: when the absolute value of the first real-time current is greater than or equal to a preset current value, determining that the battery is not disconnected from the bus.

[0019] Furthermore, in the embodiment of the present application, the method further includes: when there is real-time current generated by the battery in the charging circuit, determining that the battery is not disconnected from the bus.

[0020] On the other hand, the present application also provides a power supply system, including the battery protection device, controller, current sampling circuit and voltage sampling circuit mentioned above; the current sampling circuit, the current sampling circuit and the battery protection device are all connected to the controller; the current sampling circuit is used to sample the real-time current output by the battery or the current of the loop formed by the battery and the first capacitor; the voltage sampling circuit is used to sample the first real-time voltage of the bus and sample the second real-time voltage across the first capacitor.

[0021] In addition, the present application also provides an electric power device, including the power supply system described above.

[0022] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application:

[0023] The present application can use the first capacitor in the first charging circuit and the second charging circuit to play the role of current buffering when the DC bus charges the battery. At the same time, the switching between different switches in the first charging circuit, the second charging circuit and the voltage adjustment circuit of the present application can realize the status monitoring of whether the battery is disconnected from the bus. The present application can effectively reduce the battery impact current, improve the battery operation time and operation quality; at the same time, it can also accurately measure the online status of the battery in real time, which can improve the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A circuit diagram of a battery protection device in a specific embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the steps of a method for monitoring a battery disconnected from a busbar state in a specific embodiment of the present invention;

[0026] Figure 3 A schematic diagram of a module of a power supply system in a specific embodiment of the present invention;

[0027] Figure 4 A circuit diagram of a current sampling circuit in a specific embodiment of the present invention;

[0028] Figure 5The figure is a circuit diagram of a voltage sampling circuit in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings to explain the principles and processes of the battery protection device, the bus-off status monitoring method, system and equipment in the embodiments of the present invention.

[0030] The plant DC power supply system is the power source for important equipment such as secondary generation equipment, communication equipment, and emergency lighting in power plants. Its continuous power supply performance requirements are very high. To ensure the continuous power supply of the DC system, the DC system is equipped with a battery pack as a backup power supply. The continuous power supply performance of the DC system is directly related to the quality of the battery pack. The cost of the valve-regulated lead-acid battery used in the DC system is lower than that of other power batteries, but its resistance to large current shocks is relatively weak. Under large current shocks, an open circuit may occur, causing the battery pack to lose its function. In the early stage of the DC system providing emergency current, short-term large currents are inevitable. In order to better ensure the high-quality operation of the battery, it is necessary to consider sharing the battery collection current problem.

[0031] The battery pack of the DC system is in a floating charge state for a long time. The voltage and current changes in the floating charge state are very small. If the battery is disconnected from the busbar, it is difficult to detect; the existing equipment has current judgment, but the floating charge current is very small and the probability of misjudgment is high; some equipment injects signals for judgment, but the DC system cannot inject signals in real time and can only measure periodically, and the measurement efficiency is not high. Comprehensive analysis shows that the existing monitoring equipment has problems such as low accuracy and low efficiency in monitoring the problem of battery disconnection from the busbar. Therefore, there are still problems in the relevant technology that need to be solved urgently.

[0032] In view of the above-mentioned defects of the prior art, Figure 1 , Figure 1 1 is a schematic diagram of a battery protection device provided in an embodiment of the present application. A battery protection device, the protection device can be connected to the busbar of a DC system, and the device can include a first charging circuit, a second charging circuit and a voltage adjustment circuit. Figure 1, the first charging circuit may include a first resistor R1, a first capacitor C1 and a first switch K1, and the second charging circuit may include a second resistor R2, a first capacitor C1 and a second switch K2. The voltage adjustment circuit may include a third switch K3, a third resistor R3, a first resistor R1 and a first capacitor C1. One end of the first switch K1 may be connected to one end of the second switch K2, and one end of the first switch K1 may be connected to a bus of the DC system as a first connection end of the protection device. The other end of the first switch K1 may be connected to one end of the first resistor R1. The other end of the second switch K2 and one end of the third switch K3 may be connected to one end of the second resistor R2. The other end of the third switch K3 may be connected to one end of the third resistor R3. The other end of the first resistor R1 and the other end of the second resistor R2 may be connected to one end of the first capacitor C1. The other end of the third resistor R3 may be connected to the other end of the first capacitor C1. The other end of the first capacitor C1 may be connected to another bus of the DC system as a second connection end of the protection device.

[0033] Further, in some feasible embodiments of the present application, the device may further include a discharge circuit. The discharge circuit may include a first diode D and a first capacitor C1. The anode of the first diode D may be connected to one end of the first capacitor C1. The cathode of the first diode D may be connected to one end of the first switch K1.

[0034] Furthermore, in some feasible embodiments of the present application, the withstand voltage of the first capacitor C1 is greater than or equal to the bus voltage of the DC system.

[0035] Further, in some feasible embodiments of the present application, the resistance of the first resistor R1 is greater than the resistance of the second resistor R2, or the resistance of the first resistor R1 is less than the resistance of the second resistor R2. It is understandable that the current of the first charging circuit during charging may be greater than the current of the second charging circuit during charging, and the current of the first charging circuit during charging may also be less than the current of the second charging circuit during charging.

[0036] In addition, the present application also provides a method for monitoring the state of a battery disconnected from a busbar. The method can be implemented by the above-mentioned battery protection device. Figure 2 , the method may include steps S101-S102.

[0037] S101, close the first switch and the second switch to fully charge the first capacitor and obtain a first real-time current generated by the battery, a first real-time voltage of the bus, and a second real-time voltage across the first capacitor.

[0038] S102: When the absolute value of the first real-time current is less than the preset current value, the first switch is disconnected, the second switch is disconnected, and the third switch is closed to discharge the first capacitor. When the first capacitor is discharged to the point where the difference between the first real-time voltage and the second real-time voltage is greater than the preset voltage, the third switch is disconnected, and the second switch or the first switch is closed to charge the first capacitor. During the charging of the first capacitor, it is monitored whether there is a real-time current generated by the battery in the charging circuit. If not, it is determined that the battery is disconnected from the busbar.

[0039] Further, in some feasible embodiments of the present application, the step of closing the first switch and the second switch to fully charge the first capacitor may specifically include S201 or S202.

[0040] When the resistance of the first resistor is greater than the resistance of the second resistor, the first switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the first switch is opened and the second switch is closed to fully charge the first capacitor.

[0041] When the resistance of the first resistor is less than the resistance of the second resistor, the second switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the second switch is opened and the first switch is closed to fully charge the first capacitor.

[0042] Furthermore, in some feasible embodiments of the present application, the monitoring method may further include determining that the battery is not disconnected from the bus when the absolute value of the first real-time current is greater than or equal to a preset current value.

[0043] Furthermore, in some feasible embodiments of the present application, the monitoring method may also include determining that the battery is not disconnected from the bus when there is real-time current generated by the battery in the charging circuit.

[0044] Specifically, the principles of the present application are explained below in conjunction with specific embodiments.

[0045] In this embodiment, the device structure can refer to Figure 1 When the device is turned on for the first time, the device disconnects K3 and closes K1, using a small current circuit to slowly charge the capacitor. After charging to a certain amount of electricity, K2 can be closed and charged with a large current until the capacitor is fully charged.

[0046] After the capacitor is fully charged, it acts as a backup power source through the discharge circuit; when the DC system brings a large current impact load, the capacitor and the battery supply power at the same time, effectively reducing the battery impact current peak and ensuring the safe operation of the battery.

[0047] Real-time monitoring of battery current I Bat , bus voltage U m and the real-time voltage U of the capacitor c , through I Ba tDetermine whether the battery is disconnected from the busbar. If |I Bat |≥50mA, the battery will not be disconnected from the busbar; if |I Ba t |<50mA, the battery may be disconnected from the busbar and further judgment is required;

[0048] If there is a suspected battery disconnection fault, disconnect K1 and K2, close K3 to discharge the capacitor. m -U c >5V, disconnect K3 and close K2 to quickly charge the capacitor; the instantaneous charging current of the capacitor is large, and the current is provided by the charger and the battery. At this time, measure I Bat Determine whether the battery is disconnected from the busbar; if the capacitor is charging, I Bat If there is current, the battery is not disconnected from the busbar. If there is no current, the battery is disconnected from the busbar.

[0049] In summary, the battery protection device of the present application has the following advantages:

[0050] 1. The battery protection device and the method for monitoring the battery disconnection from the busbar state of the present application can effectively reduce the battery impact current and ensure the long-term high-quality operation of the battery. At the same time, the device can also accurately measure the online state of the battery in real time. If it is disconnected from the busbar, it can be handled in time to avoid power production accidents. The results are of great significance to power production.

[0051] In addition, the present application also provides a power supply system. The system may include the battery protection device, controller, current sampling circuit and voltage sampling circuit described above. The current sampling circuit, current sampling circuit and battery protection device are all connected to the controller. The current sampling circuit is used to sample the real-time current output by the battery or the current of the loop formed by the battery and the first capacitor. The voltage sampling circuit is used to sample the first real-time voltage of the bus and the second real-time voltage across the first capacitor.

[0052] Specifically, Figure 3 As shown, the power supply system includes a power supply circuit, a main control CPU circuit, a current acquisition circuit, a voltage acquisition circuit, a human-computer interaction circuit, a communication circuit, a control circuit, and resistors and capacitors.

[0053] The power supply circuit is a circuit unit that converts high voltage into low voltage and supplies working power to other functional units of the device. The main control CPU circuit adopts a single-chip microcomputer design, including a single-chip microcomputer and its peripheral circuits; it realizes data acquisition DA operation, human-computer interaction data processing, communication data processing, data operation and control output functions. The voltage / current acquisition circuit designs different operational amplifier circuits to realize the voltage and current acquisition functions. The human interaction circuit includes a display screen and related interface circuits. The communication circuit designs a 485 communication circuit, which is reserved for communication with the host computer. The control circuit is the CPU that controls the charging and discharging of capacitors, realizes the functions of safe charging of capacitors, judging the battery's disconnection from the busbar state, and obtaining evidence of current generation control. Main control CPU circuit. The main control CPU serves as the system control center, receiving, analyzing and sending data. The CPU uses the STC12C5410AD microcontroller, which is a high-speed, low-power, and highly anti-interference microcontroller. The instruction code is fully compatible with the traditional 8051, but it is 8-12 times faster. It is a single-clock / machine cycle microcontroller with an internal integrated MAX810 dedicated reset circuit. It has the characteristics of high anti-static and anti-4kV fast pulse interference. The CPU has 8-channel 10-bit high-speed A / D converters with a speed of up to 100kHz and a rectified output voltage cycle of 300Hz, which fully meets the signal sampling requirements. The most important ripple measurement algorithm is also completed by the CPU. According to the parameter signal transmitted by the ripple sampling module, the ripple voltage and ripple coefficient are calculated through the algorithm, and the results are displayed on the LCD screen.

[0054] The current sampling circuit can refer to Figure 4 , Figure 4 In the circuit, the signal can first pass through the RC low-pass filter. The RC low-pass filter can be composed of R87 and C119; after low-pass filtering, in order not to affect the input, the signal passes through the voltage follower circuit designed by the amplifier. The voltage follower circuit can be composed of U37 and its peripheral devices; the signal is amplified after passing through the follower, and U40 and its peripheral devices can form an amplifier circuit; after the signal is amplified, it passes through a low-pass filter again and then enters the AD conversion.

[0055] The voltage sampling circuit can refer to Figure 5 , Figure 5 In the circuit, the voltage signal is divided by resistors and then filtered by filters; the filtered signal is amplified by isolation and then by operational amplifiers; finally, the signal is filtered by filters and enters the AD conversion chip for sampling.

[0056] The communication circuit uses the 485 bus. In order to prevent the communication line from coupling in high voltage during external wiring and causing damage to the device, we use an isolated 485 chip.

[0057] The contents of the above-mentioned device embodiments are all applicable to the present power system embodiment. The functions specifically implemented by the present power system embodiment are the same as those of the above-mentioned device embodiments, and the beneficial effects achieved are also the same as those achieved by the above-mentioned method embodiments.

[0058] In addition, the present application also provides an electric power device, which may include the power supply system described above.

[0059] The contents of the above power system embodiment are all applicable to the present power equipment embodiment. The functions specifically implemented by the present power equipment embodiment are the same as those of the above power system embodiment, and the beneficial effects achieved are also the same as those achieved by the above method embodiment.

[0060] In some optional embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the application is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Optional embodiments are expected, wherein the order of various operations is changed and the sub-operation described as a part of a larger operation is performed independently.

[0061] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present application. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional techniques of the engineer. Therefore, those skilled in the art can implement the present application set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the attached claims and their equivalents.

[0062] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0064] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments. Technical personnel familiar with the field may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A battery protection device, characterized in that: The protection device is connected to the busbar of the DC system, and the device includes: a first charging circuit, a second charging circuit and a voltage adjustment circuit; the first charging circuit includes a first resistor, a first capacitor and a first switch, the second charging circuit includes a second resistor, a first capacitor and a second switch; the voltage adjustment circuit includes a third switch, a third resistor, the first resistor and a first capacitor; One end of the first switch is connected to one end of the second switch, and one end of the first switch is connected to one of the busbars of the DC system as the first connection end of the protection device; the other end of the first switch is connected to one end of the first resistor; the other end of the second switch and one end of the third switch are connected to one end of the second resistor; the other end of the third switch is connected to one end of the third resistor; the other end of the first resistor and the other end of the second resistor are connected to one end of the first capacitor; the other end of the third resistor is connected to the other end of the first capacitor; the other end of the first capacitor is connected to another busbar of the DC system as the second connection end of the protection device.

2. The battery protection device according to claim 1, characterized in that: The device also includes a discharge circuit; the discharge circuit includes a first diode and the first capacitor; the anode of the first diode is connected to one end of the first capacitor; and the cathode of the first diode is connected to one end of the first switch.

3. The battery protection device according to claim 1, characterized in that: The withstand voltage of the first capacitor is greater than or equal to the bus voltage of the DC system.

4. The battery protection device according to claim 1, characterized in that: The resistance value of the first resistor is greater than the resistance value of the second resistor, or the resistance value of the first resistor is less than the resistance value of the second resistor.

5. A method for monitoring the state of a battery disconnected from a busbar, characterized in that: The method is implemented by the battery protection device according to any one of claims 1 to 4, and comprises: Closing the first switch and the second switch to fully charge the first capacitor and obtaining a first real-time current generated by the battery, a first real-time voltage of the bus, and a second real-time voltage across both ends of the first capacitor; When the absolute value of the first real-time current is less than a preset current value, the first switch is opened, the second switch is opened, and the third switch is closed to discharge the first capacitor; when the first capacitor is discharged until the difference between the first real-time voltage and the second real-time voltage is greater than a preset voltage, the third switch is opened, and the second switch or the first switch is closed to charge the first capacitor, and during the charging of the first capacitor, whether there is a real-time current generated by the battery in the charging circuit is monitored, and if not, it is determined that the battery is disconnected from the bus.

6. The method for monitoring the state of a battery disconnected from a busbar according to claim 5, characterized in that: The step of closing the first switch and the second switch to fully charge the first capacitor specifically includes: When the resistance of the first resistor is greater than the resistance of the second resistor, the first switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the first switch is opened and the second switch is closed to fully charge the first capacitor; When the resistance of the first resistor is less than the resistance of the second resistor, the second switch is closed to increase the voltage of the first capacitor to a preset voltage value, and then the second switch is opened and the first switch is closed to fully charge the first capacitor.

7. The method for monitoring the state of a battery disconnected from a busbar according to claim 5, characterized in that: The method further includes: when the absolute value of the first real-time current is greater than or equal to a preset current value, determining that the battery is not disconnected from the bus.

8. The method for monitoring the state of a battery disconnected from a busbar according to claim 5, characterized in that: The method further includes: when there is real-time current generated by the storage battery in the charging circuit, determining that the storage battery is not disconnected from the bus.

9. A power supply system, characterized in that: It comprises the battery protection device, controller, current sampling circuit and voltage sampling circuit as described in any one of claims 1 to 4; the current sampling circuit, the current sampling circuit and the battery protection device are all connected to the controller; the current sampling circuit is used to sample the real-time current output by the battery or the current of the loop formed by the battery and the first capacitor; the voltage sampling circuit is used to sample the first real-time voltage of the bus and sample the second real-time voltage across the first capacitor.

10. An electric power device, characterized in that: A power supply system comprising the power supply system as claimed in claim 9.

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