Protection method and protection device of energy storage system, electronic device and storage medium

Abstract

The invention provides an energy storage system protection method and device, an electronic device and a storage medium, and the method comprises the steps: detecting the residual bus voltage of an energy storage system under the condition that the energy storage system is disconnected with a battery device, and judging whether the residual bus voltage is in a safety range or not based on the residual bus voltage. Therefore, the preset protection device is controlled to execute protection measures, and surge current impact caused by direct access of the battery device when the voltage of the residual bus is too high is avoided. Compared with a traditional mode of consuming the bus voltage through parallel connection of a discharge resistor, the implementation mode does not need frequent discharge, avoids the problem of overheating of the discharge resistor, guarantees the safety and reliability of the system in a frequent restart scene through the linkage of voltage detection and a protection device, and improves the reliability of the system. The technical problem that the energy storage system is overheated due to frequent restart is solved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a protection method, protection equipment, electronic equipment and storage medium for an energy storage system. Background Art

[0002] Energy Storage System (ESS) refers to an energy management system that stores electrical energy through multiple devices and releases it when needed. Energy storage systems are widely used in energy balance, improving power quality and optimizing power system operation. Its core function is to store and release electrical energy to meet electricity demand, smooth load fluctuations or provide backup power.

[0003] In the prior art, when the energy storage system is frequently restarted, a technical problem of overheating of the energy storage system is caused. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide a protection method, protection device, electronic device and storage medium for an energy storage system to solve the technical problem in the related art that the energy storage system overheats when the energy storage system is frequently restarted.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for protecting an energy storage system, the method comprising:

[0007] When the energy storage system is disconnected from the battery device, detecting the residual bus voltage of the energy storage system; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor;

[0008] Based on the residual bus voltage, determining whether the residual bus voltage is within a safe range;

[0009] When the residual bus voltage is not within a safe range, the preset protection device is controlled to execute preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device.

[0010] In a second aspect, the present invention provides a protection device for an energy storage system, the device comprising:

[0011] A residual bus voltage sampling circuit, which is used to sample the residual bus voltage of the energy storage system when the energy storage system is disconnected from the battery device; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor;

[0012] A protection device is used to implement preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device

[0013] A controller is used to determine whether the residual bus voltage is within a safe range based on the residual bus voltage, and to control a preset protection device to execute a preset protection measure if the residual bus voltage is not within a safe range.

[0014] In a third aspect, the present invention provides an electronic device comprising: a memory, and one or more processors communicatively connected to the memory; the memory stores instructions executable by the one or more processors, and the instructions are executed by the one or more processors so that the one or more processors implement the above-mentioned method.

[0015] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer program is stored in the computer-readable storage medium, and the computer program implements the above method when executed by a processor.

[0016] Beneficial effects:

[0017] The present invention detects the residual bus voltage of the energy storage system when the energy storage system is disconnected from the battery device, and determines whether it is within a safe range based on the residual bus voltage, thereby controlling the preset protection device to perform protection measures, thereby avoiding the surge current impact caused by the direct connection of the battery device when the residual bus voltage is too high. Compared with the traditional method of consuming the bus voltage through parallel discharge resistors, this embodiment does not require frequent discharge to avoid the problem of overheating of the discharge resistor. At the same time, through the linkage of voltage detection and protection devices, the safety and reliability of the system in frequent restart scenarios are guaranteed, solving the technical problem of overheating of the energy storage system due to frequent restarts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a circuit diagram of a storage system in the related art provided by an embodiment of the present invention;

[0019] Figure 2 is a flow chart of a method for protecting an energy storage system provided by an embodiment of the present invention;

[0020] Figure 3 is a circuit diagram of an energy storage system provided by an embodiment of the present invention;

[0021] Figure 4 is a flow chart of a method for protecting an energy storage system provided by an embodiment of the present invention;

[0022] Figure 5 is a flow chart of a method for protecting an energy storage system provided by an embodiment of the present invention;

[0023] Figure 6 It is a block diagram of an electronic device used in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0025] In the relevant technology, energy storage systems are widely used in household, industrial and commercial fields. Their main function is to store electrical energy through connection with battery devices and release it to load equipment when needed. In such systems, the management of bus voltage is crucial to ensure the safety and reliability of the system. In particular, when the energy storage system is frequently started and stopped with the battery device (for example, the battery device is frequently connected and disconnected from the energy storage system), a reasonable circuit design is required to manage the changes in bus voltage.

[0026] like Figure 1 As shown in the figure, it is a commonly used energy storage system circuit structure. In this structure, a bus capacitor (C1 and C2) is connected between the bus positive pole (OHV+) and the bus negative pole (OHV-) to smooth the voltage and store energy. In addition, a pre-charging circuit is designed, including contactors (main positive contactor and main negative contactor) as well as pre-charging contactors and current limiting resistors, which are used to gradually charge the bus capacitor when the battery device is connected to prevent surge current. However, in order to further ensure the safety of the system, conventional designs usually connect discharge resistors in parallel at both ends of the bus capacitor to quickly reduce the bus voltage after the battery is disconnected.

[0027] When the bus capacitor is disconnected, the bus residual voltage is quickly dissipated as heat energy through the discharge resistor. If the system is restarted frequently, the discharge resistor will continue to work, causing it to overheat or even burn out. At the same time, excessive heat may have adverse effects on surrounding components and shorten the life of the system. The discharge resistor converts all the electrical energy stored in the bus capacitor into heat energy for release, which significantly increases the energy loss of the system and reduces the overall efficiency of the energy storage system. In the case where the discharge resistor cannot be fully discharged or works abnormally, the residual bus voltage may remain at a high level. When the battery device is connected again, the high voltage difference may trigger a transient surge current, which will impact the bus capacitor, switching devices (such as S1 to S4 in the figure) and battery devices of the energy storage system, thereby causing system instability or even component damage.

[0028] Therefore, when the energy storage system is frequently restarted (the battery device is repeatedly connected to the energy storage system), a technical problem of overheating of the energy storage system may occur.

[0029] like Figure 2 As shown, this embodiment provides a protection method for an energy storage system, which can be executed by a controller and may include:

[0030] Step S12: When the energy storage system is disconnected from the battery device, the residual bus voltage of the energy storage system is detected; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor.

[0031] In this embodiment, when the energy storage system is disconnected from the battery device, the bus of the energy storage system is no longer directly connected to the battery, and the bus voltage is mainly maintained by the residual energy stored in the bus capacitor. The bus capacitor is not connected in parallel with a discharge resistor, which is to solve the problem of overheating caused by frequent discharge of the discharge resistor in the related art. Therefore, in this embodiment, a discharge resistor is not used, and the safety state is judged by detecting the voltage.

[0032] In this implementation, the controller may detect the residual bus voltage of the energy storage system through a residual bus voltage sampling circuit.

[0033] In this embodiment, the residual bus voltage sampling circuit may be a voltage divider circuit. Specifically, the voltage divider circuit uses a voltage divider resistor to proportionally reduce the high voltage of the bus to a low voltage so that a controller (eg, DSP or MCU) can directly sample and process.

[0034] In this embodiment, the residual bus voltage sampling circuit may be a voltage sensor. Specifically, a dedicated voltage sensor (such as a Hall effect sensor) may be used to directly detect the bus voltage and generate a proportional signal.

[0035] In this embodiment, the residual bus voltage sampling circuit may be a resistor shunt + operational amplifier circuit. Specifically, a small voltage signal is obtained through a resistor shunt, and then the signal is amplified and conditioned by an operational amplifier.

[0036] In this implementation, the residual bus voltage sampling circuit may be an isolated sampling circuit.

[0037] In this implementation, the residual bus voltage sampling circuit may also be an integrated voltage monitoring chip.

[0038] like Figure 3 As shown, in a possible and specific implementation, the residual bus voltage sampling circuit may be:

[0039] 1. Sampling input

[0040] The sampling input end of the residual bus voltage sampling circuit is directly connected to the energy storage system bus (OHV+ and OHV-) for collecting bus voltage signals.

[0041] 2. Resistance unit

[0042] The voltage divider circuit composed of multiple high-precision resistors can divide the high voltage to meet the input range of the subsequent signal processing module. Its function is to limit the input voltage and protect the subsequent circuit from damage by the bus high voltage. It can also provide a stable voltage divider ratio to ensure the accuracy of the sampling signal.

[0043] The input end of the resistor unit is connected to the positive and negative poles of the busbar (OHV+ and OHV-) respectively. The output end of the resistor unit is connected to the filter unit C3 and the non-inverting input end (+) of the operational amplifier U1 on one hand, and to the inverting input end (-) of the operational amplifier U1 and the reference ground on the other hand.

[0044] 3. Filter capacitor C3

[0045] The filter capacitor C3 is connected in parallel with the operational amplifier U1 to smooth the voltage signal after voltage division and filter out high-frequency noise and spike interference in the bus voltage.

[0046] 4. Operational amplifier U1

[0047] The output end of the operational amplifier U1 is directly connected to the input interface of the controller DSP, and is used to further condition the divided signal to adapt it to the input range of the DSP.

[0048] 5. Controller

[0049] The DSP core controller is used to receive the voltage signal output by the operational amplifier U1, monitor the bus voltage in real time, and control the system operation.

[0050] The analog input of DSP is connected to the output of operational amplifier U1 to collect the conditioned bus voltage signal. DSP is connected to the indicator light control circuit (R1, R2, R3) and the backup power supply module through the digital output pin to control the state of the LED light and the power supply of the circuit.

[0051] In this embodiment, the battery device may be a lithium-ion battery.

[0052] In this embodiment, the battery device may be a lead-acid battery.

[0053] In this embodiment, the battery device may be a sodium ion battery.

[0054] In this embodiment, the battery device may also be an all-vanadium liquid flow battery.

[0055] In this embodiment, the battery device may also be a nickel-hydrogen battery.

[0056] In this embodiment, the energy storage system may be a household energy storage system.

[0057] In this embodiment, the energy storage system may be an industrial energy storage system.

[0058] In this embodiment, the energy storage system may be a commercial energy storage system.

[0059] In this embodiment, the energy storage system may be a data center energy storage system.

[0060] In this embodiment, the energy storage system may be a vehicle-mounted energy storage system.

[0061] In this embodiment, the energy storage system may include: power conversion equipment, pre-charging circuit, bus device, contactor and circuit breaker, etc. It can be understood that the power conversion equipment can be an inverter or a rectifier, or a bidirectional converter. The pre-charging circuit can limit transient current (surge current) and protect the energy storage system and battery device. The bus device is used to connect the energy storage medium, the power conversion equipment and the load to realize the transmission and distribution of electric energy. The contactor and the circuit breaker may include a main circuit contactor, a pre-charging contactor and a circuit breaker. The main circuit contactor is used to control the on and off of the main circuit of the energy storage system. The pre-charging contactor is used to control the pre-charging circuit.

[0062] In one possible and specific embodiment, the energy storage system may be:

[0063] 1. Circuit breaker (manual)

[0064] The circuit breaker (manual) is used to disconnect the energy storage system from the battery device in an emergency, and plays the role of overload and short circuit protection. The circuit breaker (manual) is connected between the positive bus (OHV+) and the negative bus (OHV-) of the energy storage system.

[0065] 2. Main positive contactor

[0066] The main positive contactor controls the connection between the positive electrode of the battery and the positive busbar (OHV+) of the energy storage system. Its input end is connected to the output end of the circuit breaker (manual). Its output end is connected to the positive busbar of the energy storage system.

[0067] 3. Main negative contactor

[0068] The main negative contactor controls the connection between the negative electrode of the battery and the negative busbar (OHV-) of the energy storage system. Its input end is connected to the negative electrode of the battery. Its output end is connected to the negative busbar of the energy storage system.

[0069] 4. Pre-charging contactor

[0070] The pre-charging contactor is used to complete the pre-charging of the bus capacitor through the current limiting resistor before the main circuit contactor (main positive, main negative) is closed to prevent surge current. One end is connected to the main positive contactor input terminal, and the other end is connected to the positive bus through the current limiting resistor.

[0071] 5. Current limiting resistor

[0072] The current limiting resistor is used to limit the current during the pre-charging stage to protect the bus capacitor and system components from the impact of surge current.

[0073] 6. Bus capacitor C1 and bus capacitor C2

[0074] The bus capacitor C1 and the bus capacitor C2 are used to smooth the bus voltage, reduce voltage fluctuations, and provide transient power support. The bus capacitor C1 and the bus capacitor C2 are connected in parallel between the positive bus and the negative bus.

[0075] 7. Filter inductor L1 and filter inductor L2

[0076] The filter inductor L1 and the filter inductor L2 are used to suppress high-frequency harmonics in the current and protect the power quality of the energy storage system. The filter inductor L1 and the filter inductor L2 are connected in series between the positive bus and the main circuit to play a filtering and energy storage role.

[0077] 8. Half-bridge switch unit (S1, S2, S3, S4)

[0078] The half-bridge switch unit is used to implement a power electronic conversion function (eg, DC-DC or DC-AC conversion) and is a converter element in an energy storage system.

[0079] Step S14: Based on the residual bus voltage, determine whether the residual bus voltage is within a safe range.

[0080] In this embodiment, the safety range can be expressed as a preset value or a specific voltage range. When the residual bus voltage drops to a certain value or voltage range, the controller can consider that the residual bus voltage is low enough and will not generate surge current or damage the system due to the connection of the battery device.

[0081] Specifically, the safety range may be 0V, indicating that there is no electrical energy stored in the bus capacitor.

[0082] The safety range may be when the residual bus voltage drops to a value that cannot be detected by the residual bus voltage sampling circuit. In other words, the safety range may be when the residual bus voltage drops below the detection threshold (e.g., tens of millivolts) of the residual bus voltage sampling circuit, that is, the voltage value is below the range that the system can perceive.

[0083] In this embodiment, the safety range may also be a certain proportional value. For example, it may be 5% or 10% of the rated bus voltage. Specifically, the safety range may be a certain proportional value of the residual bus voltage dropped to the rated bus voltage. For example, if the rated bus voltage is 400V, the safety range may be set to be lower than 40V (10%) or 20V (5%).

[0084] In this embodiment, the safety range can be expressed as a specific voltage interval. This interval is set to adapt to the complexity of the actual operation of the circuit and the error of the detection circuit, and to provide a certain flexibility for the control strategy. For example, assuming that the rated bus voltage is 400V, the safety range can be 20V~40V. 20V is used to indicate that the bus capacitor has been discharged to a lower level. 40V is used to indicate that the bus voltage is not completely zero, but it is low enough and will not have an impact on the system or battery device. The controller samples the residual bus voltage and compares whether the residual bus voltage falls within the above range. If the residual bus voltage is within the range of 20V~40V, it is considered that the residual bus voltage is in a safe range.

[0085] It is understandable that, on the one hand, the discharge of bus capacitors is usually a dynamic process and cannot drop to a fixed value instantly. Setting the voltage range can avoid false triggering of protection actions during the capacitor voltage drop. For example, when the bus voltage starts to drop from 400V, after passing through the range of 40V to 20V, it can be ensured that the remaining electrical energy of the capacitor is no longer sufficient to affect the battery device or energy storage system. Secondly, different energy storage systems have different tolerances to surge currents, and the specific safety range can also be adjusted according to the actual system design. For example, systems that are insensitive to surge currents may allow a wider range, such as 50V to 100V. Systems that are sensitive to surge currents may require a narrower range, such as 10V to 20V.

[0086] In this embodiment, the action of judging can be represented by the controller comparing the sampled voltage signal with a preset safety voltage threshold. If the sampled signal is higher than the safety threshold, it is determined that the bus voltage is not within the safety range, and the protection device is triggered.

[0087] Step S16: When the residual bus voltage is not within a safe range, control the preset protection device to execute preset protection measures to prevent the direct connection between the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device.

[0088] In this embodiment, the core purpose of this step is to trigger the preset protection device and execute corresponding protection measures when detecting that the residual bus voltage is not within the safe range, so as to avoid the impact caused by the battery device being directly connected to the energy storage system.

[0089] In this embodiment, the protection device may be a preset hardware for preventing the battery device from being directly connected to the energy storage system in dangerous situations.

[0090] The preset hardware may be an LED lamp. Specifically, when the LED lamp is used as a protection device, its main function is to prompt the user (e.g., operator) of the bus voltage status in an intuitive visual manner to prevent misoperation in unsafe conditions. LED lamps of different colors correspond to different bus voltage states. Two colors of LED lamps may be provided. A yellow LED lamp may indicate that the bus voltage is not within a safe range, prompting the operator not to connect the battery device temporarily. A green LED lamp may indicate that the bus voltage is within a safe range, prompting the operator to safely connect the battery device. When the residual bus voltage is not within a safe range, the DSP outputs a high-level signal to the drive circuit corresponding to the yellow LED lamp, lighting up the yellow LED. Accordingly, the green LED lamp remains off. Also accordingly, when the residual bus voltage is within a safe range, the DSP outputs a high-level signal to the drive circuit corresponding to the green LED lamp, lighting up the green LED. The yellow LED lamp turns off. The operator determines the operation steps according to the color prompts of the LED lamp to avoid misoperation.

[0091] The preset hardware may be a buzzer. Specifically, when the buzzer is used as a protection device, it prompts the bus voltage status through sound, which is particularly suitable for scenarios where the operating environment is noisy or requires clear reminders. The buzzer can prompt the operator of the bus voltage status by emitting sounds of different tones or frequencies. A continuous buzzing indicates that the bus voltage is not within a safe range, prompting the operator not to connect the battery. A short buzzing indicates that the bus voltage is within a safe range, prompting the operator to connect the battery. When the residual bus voltage is not within a safe range, the DSP outputs a continuous PWM signal to drive the buzzer to emit a continuous buzzing sound. When the residual bus voltage is within a safe range, the DSP outputs a PWM signal with a short interval to drive the buzzer to emit an intermittent buzzing sound.

[0092] The preset hardware may be a display screen. Specifically, when the display screen is used as a protection device, more detailed bus voltage status information may be provided through text, symbols or graphics. When the residual bus voltage is not within a safe range, "The bus voltage is too high, please do not connect the battery" is displayed. When the residual bus voltage is within a safe range, "The bus voltage is normal, and the battery can be safely connected" is displayed. It is understandable that the DSP generates corresponding prompt information based on the residual bus voltage, and sends the information to the display screen through a communication protocol (e.g., I2C, SPI or UART).

[0093] In this embodiment, the protection device may also be a preset control mechanism for preventing the battery device from being directly connected to the energy storage system in dangerous situations.

[0094] Specifically, when the protection device is a preset control mechanism, the step of controlling the preset protection device to execute the preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device may be: the controller controls the contactor (main positive contactor and main negative contactor) of the main circuit to remain in a disconnected state to prevent the battery device from being directly connected to the bus. For example, the DSP controls the drive circuit of the contactor through an output signal to keep the contactor disconnected to prevent surge current from impacting the bus capacitor and the system load.

[0095] Specifically, when the protection device is a preset control mechanism, the step of controlling the preset protection device to execute preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing an impact on the energy storage system and / or the battery device may be: controlling the pre-charging contactor to close, using the pre-charging resistor to limit the current, so that the bus capacitor gradually discharges or balances with the battery voltage. For example, the DSP controls the contactor in the pre-charging circuit to close, allowing the bus to be connected to the battery through the pre-charging resistor. The current amplitude is limited by the resistor, and the bus voltage is slowly adjusted to a safe range. When the bus voltage reaches the safe range, the pre-charging circuit is disconnected, and the main circuit contactor is closed to complete the connection.

[0096] In this implementation, the impact on the energy storage system and / or the battery device may be an impact on the energy storage system.

[0097] In this implementation, the impact on the energy storage system and / or the battery device may be the impact on the battery device.

[0098] In this implementation, the impact on the energy storage system and / or the battery device may be an impact on the energy storage system and the battery device simultaneously.

[0099] Specifically, when the battery device is directly connected to the energy storage system, there is a significant voltage difference between the bus capacitor and the battery voltage. Instantaneous access may cause surge current, impacting key components in the energy storage system, especially bus capacitors and switching devices. The surge current passes through the bus capacitor, causing the dielectric inside the capacitor to withstand excessive transient voltage and current, which may cause capacitor breakdown, heating or even damage. The contactors (main positive contactors and main negative contactors) in the main circuit may arc due to overload under high surge currents, shortening their service life. Moreover, electronic switches (for example, MOSFETs or IGBTs) may overheat or even burn under large current shocks. Components such as filter inductors and rectifier diodes in the energy storage system may be damaged by surge currents.

[0100] Specifically, if the bus voltage of the energy storage system is significantly higher than the battery voltage, when directly connected, the bus voltage will form a high current shock through the battery, causing the battery to be subjected to excessive current and overheating risks. Transient large currents may cause violent electrochemical reactions inside the battery, generate excessive heat, and cause overheating or thermal runaway. In addition, the positive and negative plates of the battery may be damaged by excessive current, shortening the battery life.

[0101] Specifically, when there is a large difference between the battery voltage and the bus voltage, direct access not only impacts the components in the energy storage system (e.g., bus capacitors, switching devices, etc.), but also has a double impact on the battery devices (e.g., battery cells, BMS). For example, the low-impedance path between the bus and the battery forms a transient large current, which loads the energy storage system and the battery device at the same time.

[0102] This embodiment detects the residual bus voltage of the energy storage system when the energy storage system is disconnected from the battery device, and determines whether it is within a safe range based on the residual bus voltage, thereby controlling the preset protection device to perform protection measures, thereby avoiding the surge current impact caused by the direct connection of the battery device when the residual bus voltage is too high. Compared with the traditional method of consuming the bus voltage through parallel discharge resistors, this embodiment does not require frequent discharge to avoid the problem of overheating of the discharge resistor. At the same time, through the linkage of voltage detection and protection devices, the safety and reliability of the system in frequent restart scenarios are guaranteed, solving the technical problem of overheating of the energy storage system due to frequent restarts.

[0103] In some embodiments, the preset protection device is a preset status indication device; the step of controlling the preset protection device to execute preset protection measures to prevent the direct connection between the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device includes:

[0104] Step S162: Control the status indication device to display the first status to prompt the user not to connect the battery device to the energy storage system for the time being.

[0105] In this embodiment, the state indicating device may be an LED light. LED lights of different colors (e.g., green, yellow, and red) may be used to intuitively indicate the bus voltage state. For example, when the yellow light is on, it indicates that the residual bus voltage is not within a safe range, and the user is prompted not to connect the battery device temporarily.

[0106] In this embodiment, the state indicating device may be a display screen. The display screen may be a liquid crystal screen (LCD), an organic light emitting diode screen (OLED) or a digital tube, etc. The display screen may display "bus voltage is too high, do not connect the battery." or "current bus voltage: 120V, not within the safety range".

[0107] In this embodiment, the status indicating device may be a buzzer.

[0108] In this embodiment, the state indicating device may be a pointer-type voltmeter.

[0109] In this embodiment, the status indicating device may be a status indicating plate.

[0110] In this embodiment, the first state can be represented by a specific state presented by a state indicator (e.g., an LED light, a display screen, a buzzer, etc.), which is used to remind the user that the current bus voltage is not within a safe range and the battery device cannot be connected to the energy storage system temporarily. The first state can be a light, a sound, or text or an image displayed on a display screen, etc.

[0111] This embodiment displays the first state by setting a preset status indicator device (for example, an LED light, a buzzer or a display screen), and clearly prompts the user that the current bus voltage is not within the safe range, thereby effectively preventing the user from connecting the battery device under inappropriate circumstances and preventing the problem of surge current impacting the energy storage system and / or the battery device. Compared with the traditional method that relies on hardware protection (such as discharge resistance) or system automation control, this method guides the user's operation with intuitive status prompts, which not only improves the safety and reliability of the system, but also reduces the loss and maintenance cost of hardware, while enhancing the user's operating experience and system visualization, and is particularly suitable for energy storage scenarios that require manual intervention or frequent start and stop.

[0112] like Figure 4 As shown, in some embodiments, the method further comprises:

[0113] Step S18: When the residual bus voltage is within a safe range, control the status indicator device to display a second state to prompt the user to connect the battery device to the energy storage system.

[0114] In this embodiment, the second state can be represented by a state displayed by a state indicator (e.g., an LED light, a display screen, a buzzer, etc.), which is used to prompt the user that the current bus voltage is within a safe range and the battery device can be safely connected to the energy storage system. The second state can confirm that the energy storage system has electrical safety conditions through clear visual, auditory or text prompts, thereby guiding the user to perform the next operation to ensure safe connection between the system and the battery.

[0115] This embodiment displays the second state by controlling the status indicator device, clearly prompting the user that the current bus voltage is within a safe range and the battery device can be safely connected to the energy storage system. This prompt method effectively guides the user to perform correct operations and avoids the risk of misoperation due to unclear judgment of the system status by the user. Compared with traditional hardware protection or passive waiting methods, the setting of the second state improves the visibility and efficiency of operations and reduces the speculative judgment of operators. In addition, this method combines with the first state to form a complete two-way guidance mechanism, which not only ensures the safety of the system, but also enhances the user's operating experience. It is particularly suitable for energy storage system operation scenarios that require human participation.

[0116] like Figure 5 As shown, in some embodiments, the method further comprises:

[0117] Step S110: When it is detected that the battery device is connected to the energy storage system, the preset pre-charging circuit is controlled to be connected to limit the transient current between the battery device and the bus of the energy storage system.

[0118] This embodiment can effectively limit the transient current between the battery device and the energy storage system bus by controlling the preset pre-charging circuit to be connected when it is detected that the battery device is connected to the energy storage system. This method avoids the impact of surge current caused by voltage difference on bus capacitors, switching devices and other energy storage system components, thereby protecting the safety and reliability of the energy storage system and battery device. In addition, the design of the pre-charging circuit can achieve a gradual and smooth transition of current, reduce thermal stress and mechanical loss of electrical components, and increase the life of the system. At the same time, this method improves the operational stability and intelligence level of the energy storage system during the connection of the battery device through dynamic detection and control, and is particularly suitable for energy storage application scenarios that require frequent start and stop.

[0119] In some embodiments, the step of controlling the state indication device to display the first state to prompt the user not to connect the battery device to the energy storage system temporarily includes:

[0120] Step S1622: Control a preset LED light having a first color to light up to prompt the user not to connect the battery device to the energy storage system for the time being.

[0121] This embodiment controls an LED light having a first color (such as yellow or red) to light up, thereby conveying the current status of the energy storage system to the user in an intuitive manner, and prompting the user not to connect the battery device to the energy storage system for the time being. Compared with complex display screens or sound prompts, LED lights provide simple, fast, and clear visual feedback, which can be clearly seen in various environments and effectively avoid user misoperation. In addition, the use of LED lights of specific colors as prompts helps to establish a common visual language and enhance the user's ability to quickly understand the system status. This method has a simple structure, low cost, and high reliability. It is suitable for wide application in various energy storage systems, especially in scenarios that require manual intervention or frequent start and stop.

[0122] In some embodiments, the step of controlling the state indication device to display the first state to prompt the user not to connect the battery device to the energy storage system temporarily includes:

[0123] The preset display screen is controlled to display the first information to prompt the user not to connect the battery device to the energy storage system for the time being; wherein the first information is information indicating that the residual bus voltage is not within a safe range.

[0124] In this embodiment, the first information may be expressed as text prompt information, for example, "The bus voltage is too high, please do not connect the battery device.", "The current bus voltage is not within the safe range.".

[0125] In this implementation, the first information may be represented as information prompted by graphics and symbols.

[0126] In this implementation, the first information may be represented as a real-time voltage value.

[0127] This embodiment provides clear text or graphic prompts to the user by controlling the display screen to display the first information, intuitively informs the user that the current residual bus voltage is not within the safe range, and prompts the user not to connect the battery device to the energy storage system for the time being. Compared with a single color indication or sound prompt, the display screen can convey more specific and accurate information, such as the real-time value of the bus voltage or a description of the safe range, thereby helping users to quickly understand the system status and make correct operational decisions. This method is particularly suitable for complex energy storage systems or scenarios that require precise operation, which improves the user experience and system safety, while reducing the risk of misoperation due to unclear information. In addition, the information displayed on the display screen can be flexibly adjusted to meet the needs of different scenarios, further enhancing the intelligence and adaptability of the system.

[0128] In some embodiments, the step of detecting the residual bus voltage of the energy storage system includes:

[0129] The residual bus voltage is received from a preset residual bus voltage sampling circuit.

[0130] This embodiment can realize real-time and accurate detection of the bus voltage state by receiving the residual bus voltage signal from the preset residual bus voltage sampling circuit. The sampling circuit can be optimized according to the system design requirements (for example, voltage divider circuit, Hall sensor, etc.), and can adapt to various voltage ranges while ensuring signal accuracy. Compared with the traditional method of relying on experience or manual detection, this embodiment improves the efficiency and accuracy of detection with an automated voltage sampling mechanism, which helps to quickly determine whether the bus voltage is within a safe range. In addition, this method links the sampling circuit with the controller to provide a reliable basis for subsequent protection mechanisms (for example, triggering a pre-charging circuit or a control status indicator), thereby improving the safety of the energy storage system.

[0131] This embodiment provides a protection device for an energy storage system, the device comprising:

[0132] A residual bus voltage sampling circuit, which is used to sample the residual bus voltage of the energy storage system when the energy storage system is disconnected from the battery device; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor;

[0133] A protection device is used to implement preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device

[0134] A controller is used to determine whether the residual bus voltage is within a safe range based on the residual bus voltage, and to control a preset protection device to execute a preset protection measure when the residual bus voltage is not within the safe range.

[0135] In this embodiment, the controller may be a digital signal processor (DSP).

[0136] In this embodiment, the controller may be a microcontroller unit (MCU).

[0137] In this embodiment, the controller may be a programmable logic controller (PLC).

[0138] In this embodiment, the protection device may be an LED lamp, a display screen or a buzzer.

[0139] This embodiment provides an energy storage system protection device including a residual bus voltage sampling circuit, a protection device and a controller, which can realize real-time detection and dynamic protection of the bus voltage state. The residual bus voltage sampling circuit accurately collects the bus voltage signal, and can reliably judge the residual voltage state of the bus capacitor even when the discharge resistor is not connected in parallel; the controller quickly judges whether there is a surge risk based on the sampled voltage, and triggers the protection device to execute the preset protection measures when the voltage is not within the safe range, effectively preventing the battery device from being directly connected to the energy storage system. The impact on the system and equipment. Compared with traditional hardware protection methods (such as discharge resistors), this device can reduce the power loss and hardware loss of the system, and at the same time improve the safety, reliability and operation efficiency of the energy storage system through an intelligent dynamic control mechanism.

[0140] According to an embodiment of the present invention, an electronic device is provided. Figure 6 The electronic device in this embodiment may include one or more of the following components: a processor, a network interface, a memory, a non-volatile memory, and one or more applications, wherein the one or more applications may be stored in the non-volatile memory and configured to be executed by one or more processors, and the one or more programs are configured to execute the method described in the aforementioned method embodiment.

[0141] According to an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a computer, the computer executes the method described in any of the above embodiments.

[0142] According to an embodiment of the present invention, a computer program product including instructions is also provided. When the instructions are executed by a computer, the computer executes a method in any one of the above embodiments.

[0143] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0144] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0145] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0146] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0147] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for protecting an energy storage system, characterized in that: The method comprises: When the energy storage system is disconnected from the battery device, detecting the residual bus voltage of the energy storage system; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor; Based on the residual bus voltage, determining whether the residual bus voltage is within a safe range; When the residual bus voltage is not within a safe range, the preset protection device is controlled to execute preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device.

2. The method according to claim 1, characterized in that The preset protection device is a preset status indicating device; the step of controlling the preset protection device to execute preset protection measures to prevent the direct connection between the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device includes: The state indicating device is controlled to display a first state to prompt the user not to connect the battery device to the energy storage system for the time being.

3. The method according to claim 2, characterized in that The method further comprises: When the residual bus voltage is within a safe range, the status indication device is controlled to display a second status to prompt the user to connect the battery device to the energy storage system.

4. The method according to claim 3, characterized in that The method further comprises: When it is detected that the battery device is connected to the energy storage system, the preset pre-charging circuit is controlled to be connected to limit the transient current between the battery device and the bus of the energy storage system.

5. The method according to claim 2, characterized in that: The step of controlling the state indicating device to display the first state to prompt the user not to connect the battery device to the energy storage system temporarily includes: A preset LED light having a first color is controlled to light up to remind the user not to connect the battery device to the energy storage system for the time being.

6. The method according to claim 2, characterized in that The step of controlling the state indicating device to display the first state to prompt the user not to connect the battery device to the energy storage system temporarily includes: The preset display screen is controlled to display the first information to prompt the user not to connect the battery device to the energy storage system for the time being; wherein the first information is information indicating that the residual bus voltage is not within a safe range.

7. The method according to claim 1, characterized in that The step of detecting the residual bus voltage of the energy storage system comprises: The residual bus voltage is received from a preset residual bus voltage sampling circuit.

8. A protection device for an energy storage system, characterized in that: The device comprises: A residual bus voltage sampling circuit, which is used to sample the residual bus voltage of the energy storage system when the energy storage system is disconnected from the battery device; wherein the bus capacitor of the energy storage system is not connected in parallel with a discharge resistor; A protection device, which is used to execute preset protection measures to prevent the direct connection of the battery device and the energy storage system from causing impact on the energy storage system and / or the battery device; A controller is used to determine whether the residual bus voltage is within a safe range based on the residual bus voltage, and to control a preset protection device to execute a preset protection measure when the residual bus voltage is not within the safe range.

9. An electronic device, characterized in that: include: a memory, and one or more processors communicatively coupled to the memory; The memory stores instructions that can be executed by the one or more processors. The instructions are executed by the one or more processors to enable the one or more processors to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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