Safety monitoring method and device for energy storage equipment and energy storage equipment

Abstract

The invention relates to the technical field of energy storage equipment, and provides a safety monitoring method and device for energy storage equipment and the energy storage equipment, and the safety monitoring method for the energy storage equipment comprises the steps: collecting the real-time temperature of a key electrical connection terminal in real time based on a temperature sensor disposed at the key electrical connection terminal of the energy storage equipment; comparing the real-time temperature with a preset multi-stage temperature threshold value; when the real-time temperature is greater than or equal to the first early warning threshold value and less than the second turn-off threshold value, starting a first response strategy: controlling the energy storage equipment to reduce the input and output power of the key electrical connection terminal step by step until the real-time temperature is lower than the first early warning threshold value; and when the real-time temperature is greater than or equal to the second turn-off threshold value, starting a second response strategy: controlling the energy storage equipment to enter a safety protection state. According to the safety monitoring method for the energy storage equipment, thermal runaway of the energy storage equipment can be avoided, and meanwhile, great influence on the power utilization process of a user caused by direct power failure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, in particular to a safety monitoring method and device for an energy storage device and the energy storage device. BACKGROUND

[0002] In actual application, an energy storage device needs to be connected with various external devices, including photovoltaic modules, power grids and power loads. These external electrical devices are connected with the energy storage device through connection terminals (such as photovoltaic connection terminals, AC grid-connected / off-grid terminals). Due to long-term exposure to complex environments (such as temperature changes, humidity, vibration) or poor installation process, these connection terminals are prone to oxidation, corrosion or loosening, resulting in an increase in the contact resistance of the connection terminals. According to Joule's law, a large current passing through a high-resistance connection point will generate a large amount of heat, which poses a significant risk of overheating and even fire. Once the external connection point is out of control, it is easy to ignite the body of the energy storage all-in-one machine, causing the accident to spread.

[0003] In the related art, no effective monitoring mechanism has been established for the situation that the connection terminal of the energy storage device is out of control, and the energy storage device cannot perceive the thermal runaway state of the connection terminal in real time, let alone give early warning and intervention in the initial stage of thermal runaway, forming a blind area in the safety protection chain and posing a potential threat to the life and property safety of users. SUMMARY

[0004] The present application aims to at least solve the technical problem in the prior art that the energy storage device cannot timely handle the thermal runaway at the connection terminal.

[0005] To this end, a first aspect of the present application provides a safety monitoring method for an energy storage device.

[0006] A second aspect of the present application provides an energy storage device.

[0007] A third aspect of the present application provides a safety monitoring device for an energy storage device.

[0008] Therefore, according to a first aspect of the present application, a safety monitoring method of an energy storage device is provided, which comprises: collecting real-time temperature of a key electrical connection terminal of the energy storage device in real time based on a temperature sensor arranged at the key electrical connection terminal; comparing the real-time temperature with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds comprise a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold; in the case that the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, starting a first response strategy: controlling the energy storage device to gradually reduce input and output power of the key electrical connection terminal until the real-time temperature is lower than the first warning threshold; and in the case that the real-time temperature is greater than or equal to the second shutdown threshold, starting a second response strategy: controlling the energy storage device to enter a safety protection state.

[0009] The safety monitoring method of the energy storage device provided by the present application can detect the real-time temperature of the key electrical connection terminal of the energy storage device, so that in the case that the real-time temperature of the connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is started, so that the temperature is reduced by controlling the energy storage device to gradually reduce the input and output power of the key electrical connection terminal, thereby avoiding thermal runaway. In the case that the temperature of the key electrical connection terminal is greater than or equal to the second shutdown threshold, the second response strategy is started, so that the energy storage device is controlled to enter a safety protection state, thereby avoiding a serious situation such as fire of the energy storage device and ensuring the safety of the energy storage device. Compared with the method of directly controlling the energy storage device to stop running when the real-time temperature of the key electrical connection terminal is too high, the basic electricity use of the user can be ensured on the basis of avoiding thermal runaway of the energy storage device, and the direct power-off does not bring great influence to the electricity use process of the user.

[0010] In some technical solutions, optionally, the key electrical connection terminal comprises at least one of a photovoltaic connection terminal, an alternating current connection terminal and a direct current connection terminal.

[0011] In this technical solution, the energy storage device can comprise a plurality of key electrical connection terminals, each of which is used to connect with different external devices, thereby realizing the transmission of electric energy between the energy storage device and the external devices.

[0012] In some technical solutions, optionally, the control of the energy storage device to enter the safety protection state comprises: controlling an inverter of the energy storage device to shut down, and / or controlling a battery module of the energy storage device to shut down.

[0013] In this technical solution, the control of the energy storage device to enter the safety protection state can be the control of the inverter of the energy storage device, so that the energy storage device stops supplying power to the power load.

[0014] Alternatively, the control of the energy storage device into the safety protection state can be to control the battery module of the energy storage device to be turned off, so that the energy storage device stops supplying power to the direct current load. After the battery module is turned off, the direct current no longer passes through the key electrical connection terminal, and thus the key electrical connection terminal no longer generates heat, thereby achieving the purpose of rapid cooling.

[0015] In some technical solutions, optionally, after the energy storage device is controlled into the safety protection state, the method further includes: continuously monitoring the real-time temperature of the key electrical connection terminal, and when the real-time temperature falls below the first warning threshold, controlling the energy storage device to exit the safety protection state and re-enter the rated working state.

[0016] In this technical solution, the real-time temperature of the key electrical connection terminal can be continuously monitored. If the real-time temperature is still high, the energy storage device is continuously controlled to be in the safety protection state, so as to avoid serious situations such as fire. On the contrary, if the real-time temperature falls below the first warning threshold, the energy storage device can be controlled to exit the safety protection state and re-enter the rated working state, so as to ensure the power supply and bring better power experience to the user.

[0017] In some technical solutions, optionally, after the energy storage device is controlled into the safety protection state, the method further includes: continuously monitoring the real-time temperature of the key electrical connection terminal, and when the real-time temperature continuously rises and triggers the third fire-fighting threshold, controlling the fire-fighting module of the energy storage device to release the fire extinguishing agent, the third fire-fighting threshold being greater than the second shutdown threshold.

[0018] In this technical solution, the real-time temperature of the key electrical connection terminal can be continuously monitored when the energy storage device is in the safety protection state. If the real-time temperature continues to rise and is greater than the third fire-fighting threshold, which is greater than the second shutdown threshold, it indicates that the temperature of the current key electrical connection terminal has a high probability of causing a serious situation such as fire. At this time, the fire-fighting module of the energy storage device can be controlled to release the fire extinguishing agent, so as to isolate oxygen through the fire extinguishing agent and avoid fire caused by high temperature. In the case that the energy storage device has caught fire, the function of fire extinguishing can also be realized.

[0019] In some technical solutions, optionally, after the energy storage device is controlled into the safety protection state, the method further includes: synchronizing the safety protection state information to the energy storage cloud platform, so that the energy storage cloud platform pushes the safety protection state information to the user terminal.

[0020] In the technical solution, when the energy storage device is in the safety protection state, the energy storage device can also be controlled to synchronize safety protection state information to the energy storage cloud platform, that is, the condition that the energy storage device is in the safety protection state is sent to the energy storage cloud platform. At the same time, the energy storage cloud platform can push the condition that the energy storage device is in the safety protection state to the user terminal, so that the user can learn in time that the energy storage device has entered the safety protection state due to the overhigh temperature of the key electrical connection terminal, and further make the user handle the energy storage device in time to ensure the safe operation of the energy storage device.

[0021] In some technical solutions, optionally, after the fire-fighting module of the energy storage device is controlled to release the fire extinguishing agent, the method further includes synchronizing the fire-fighting alarm information to the energy storage cloud platform, so that the energy storage cloud platform sends the fire-fighting alarm information to at least one target terminal, and the at least one target terminal includes the fire-fighting alarm platform and / or the user terminal.

[0022] In the technical solution, when the real-time temperature of the key electrical connection terminal continues to rise and is greater than the third fire-fighting threshold, it indicates that the temperature of the current key electrical connection terminal has a high probability of fire or other serious conditions. At this time, the fire-fighting module of the energy storage device can be controlled to release the fire extinguishing agent, so as to realize the function of isolating oxygen by the fire extinguishing agent to avoid fire due to overhigh temperature, and also realize the function of fire extinguishing in the case that the energy storage device has caught fire. At the same time, the energy management system of the energy storage device can also be controlled to synchronize the fire-fighting alarm information to the energy storage cloud platform, that is, the condition that the fire-fighting module of the energy storage device has been triggered is sent to the energy storage cloud platform. At the same time, the energy storage cloud platform can push the condition that the fire-fighting module of the energy storage device has been triggered to at least one target terminal. These target terminals can be the fire-fighting alarm platform to speed up the fire-fighting response speed, or the user terminal such as a mobile phone, a computer, and the like.

[0023] In some technical solutions, optionally, the control of the energy storage device to gradually reduce the input and output power of the key electrical connection terminal includes: if the key electrical connection terminal is a photovoltaic connection terminal, a maximum power point tracking controller is controlled to actively deviate from a maximum power point to reduce the photovoltaic direct-current input power in a stepwise manner; if the key electrical connection terminal is an alternating-current connection terminal, an inverter of the energy storage device is controlled to reduce the alternating-current output power in a stepwise manner at a plurality of preset power gears; and if the key electrical connection terminal is a direct-current connection terminal, the inverter is controlled to reduce the direct-current output power in a stepwise manner at a plurality of preset power gears.

[0024] In the technical solution, different control modes can be implemented according to different types of key electrical connection terminals to reduce the real-time temperature of the key electrical connection terminals. If the key electrical connection terminal is a photovoltaic connection terminal, the maximum power point tracking controller of the energy storage device can be controlled to operate to make the direct current input power of the photovoltaic system deviate from the maximum power point, that is, to reduce the photovoltaic direct current input power of the photovoltaic connection terminal to reduce the heat generation. Moreover, in the process of reducing the photovoltaic direct current input power of the photovoltaic connection terminal, the photovoltaic direct current input power can be reduced in a step-by-step manner, that is, the photovoltaic direct current input power is first reduced by a preset offset, and the real-time temperature of the photovoltaic connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the photovoltaic direct current input power is again reduced by the preset offset, and the temperature of the photovoltaic connection terminal is continuously monitored. If the temperature still does not decrease, the photovoltaic direct current input power is again reduced by the preset offset, until the real-time temperature of the photovoltaic connection terminal decreases to below the first warning threshold.

[0025] If the key electrical connection terminal is an alternating current connection terminal, the operating parameters of the inverter of the energy storage device can be controlled to reduce the alternating current output power of the alternating current connection terminal to reduce the temperature of the alternating current connection terminal. Similarly, in the process of reducing the alternating current output power of the alternating current connection terminal, the alternating current output power can also be reduced in a step-by-step manner in a preset power gear, for example, the preset power gears can include a first gear, a second gear and a third gear, the alternating current output power corresponding to the first gear is greater than the alternating current output power corresponding to the second gear, and the alternating current output power corresponding to the second gear is greater than the alternating current output power corresponding to the third gear. First, the operating parameters of the inverter can be controlled to reduce the alternating current output power to the alternating current output power corresponding to the first gear, and the real-time temperature of the alternating current connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the alternating current output power is controlled to reduce to the alternating current output power corresponding to the second gear, and the real-time temperature of the alternating current connection terminal is continuously monitored. If the temperature still continues to rise or does not decrease, the alternating current output power is controlled to reduce to the alternating current output power corresponding to the third gear, until the real-time temperature of the alternating current connection terminal decreases to below the first warning threshold.

[0026] If the key electrical connection terminal is a DC connection terminal, the operating parameters of the inverter of the energy storage device can be controlled to reduce the DC output power of the DC connection terminal to reduce the temperature of the DC connection terminal. Similarly, the DC output power of the DC connection terminal can also be reduced in a preset power level stepwise manner. For example, the preset power levels can include a first level, a second level and a third level, the DC output power corresponding to the first level is greater than the DC output power corresponding to the second level, and the DC output power corresponding to the second level is greater than the DC output power corresponding to the third level. First, the operating parameters of the inverter can be controlled to reduce the DC output power to the DC output power corresponding to the first level, and the real-time temperature of the DC connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the DC output power is controlled to reduce to the DC output power corresponding to the second level, and the real-time temperature of the DC connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the DC output power is controlled to reduce to the DC output power corresponding to the third level, until the real-time temperature of the DC connection terminal decreases to below the first warning threshold.

[0027] In some technical solutions, the energy storage device includes an energy storage all-in-one machine and at least one energy storage power-up package, and the energy storage all-in-one machine and the energy storage power-up package are stacked. DC connection terminals are arranged on the energy storage all-in-one machine and the energy storage power-up package, and the adjacent surfaces of the energy storage power-up package and the energy storage power-up package. By connecting the respective DC connection terminals on the stacking surfaces, the energy storage all-in-one machine and the energy storage power-up package can be expanded in parallel.

[0028] In some technical solutions, the energy storage device can optionally control the input and output power of the key electrical connection terminal to be reduced step by step, including: reducing the current flowing through the key electrical connection terminal in a plurality of preset input and output power levels; after each input and output power level is reduced, the real-time temperature of the key electrical connection terminal is continuously monitored; if the real-time temperature stops rising or starts to decrease, the energy storage device is controlled to maintain the current input and output power.

[0029] In this technical solution, the energy storage device can reduce the input and output power of the key electrical connection terminal step by step according to a plurality of preset input and output levels. After each input and output power level is reduced, the real-time temperature of the key electrical connection terminal can be continuously detected. If the real-time temperature does not decrease, the input and output power level is reduced again, and the real-time temperature of the key electrical connection terminal is continuously detected. If the real-time temperature still does not decrease, the input and output power level is reduced again. If the temperature stops rising or starts to decrease, the energy storage device is controlled to operate at the current input and output power, thereby avoiding accidents caused by excessive temperature while ensuring continuous power supply of the energy storage device.

[0030] According to a second aspect of the present application, a power storage device is provided, comprising a battery module, an inverter and a master control unit; the battery module is used for storing or outputting electric energy; the inverter is used for AC / DC conversion; and the master control unit is used for executing the safety monitoring method of the power storage device according to any one of the above technical solutions.

[0031] The power storage device provided by the present application comprises a battery module, an inverter and a master control unit, wherein the battery module can be used for storing or outputting electric energy. Specifically, the power storage device can be connected to a photovoltaic system, and the electric energy generated by the photovoltaic system can be transmitted and stored in the battery module of the power storage device. The power storage device can also be connected to an electrical load and a power grid, and through the inverter, the direct current provided by the battery module can be converted into alternating current and transmitted to the electrical load and the power grid.

[0032] Optionally, the power storage device can further comprise a master control unit, which is used for controlling the operation process of the power storage device and can be used to implement the steps of the safety monitoring method of the power storage device according to any one of the above technical solutions. Therefore, the power storage device has all the beneficial effects of the safety monitoring method of the power storage device according to any one of the above technical solutions, which will not be described here.

[0033] According to a third aspect of the present application, a safety monitoring device for a power storage device is provided, comprising: a collection unit, configured to collect real-time temperature of a key electrical connection terminal of the power storage device based on a temperature sensor deployed at the key electrical connection terminal; a comparison unit, configured to compare the real-time temperature with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds comprise a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold; and a control unit, configured to start a first response strategy in a case where the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy being to control the power storage device to gradually reduce input and output power of the key electrical connection terminal until the real-time temperature is lower than the first warning threshold; and start a second response strategy in a case where the real-time temperature is greater than or equal to the second shutdown threshold, the second response strategy being to control the power storage device to enter a safety protection state.

[0034] The safety monitoring device of the energy storage device provided in the application detects the real-time temperature of the key electrical connection terminal of the energy storage device, so that the first response strategy is started when the real-time temperature of the connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, thereby reducing the temperature by gradually reducing the input and output power of the key electrical connection terminal of the energy storage device in a controlled manner, and thus avoiding thermal runaway. In the case where the temperature of the key electrical connection terminal is greater than or equal to the second shutdown threshold, the second corresponding strategy is started, so that the energy storage device enters a safe protection state, avoiding the occurrence of fire and other serious situations of the energy storage device, and ensuring the safety of the energy storage device. Compared with the method of directly controlling the energy storage device to stop running when the real-time temperature of the key electrical connection terminal is too high, the basic electricity of the user can be ensured on the basis of avoiding thermal runaway of the energy storage device, and the direct power-off will not have a great impact on the user's electricity process.

[0035] In some technical solutions, optionally, the key electrical connection terminal includes at least one of a photovoltaic connection terminal, an alternating current connection terminal, and a direct current connection terminal.

[0036] In some technical solutions, optionally, the control unit is specifically configured to control the shutdown of an inverter of the energy storage device, and / or control the shutdown of a battery module of the energy storage device.

[0037] In some technical solutions, optionally, after the energy storage device enters the safe protection state, the acquisition unit is further configured to continuously monitor the real-time temperature of the key electrical connection terminal, and the control unit is further configured to control the energy storage device to exit the safe protection state and re-enter a rated working state when the real-time temperature falls below the first warning threshold.

[0038] In some technical solutions, optionally, after the energy storage device enters the safe protection state, the acquisition unit is further configured to continuously monitor the real-time temperature of the key electrical connection terminal, and the control unit is further configured to control the energy storage device to release a fire extinguishing agent when the real-time temperature continuously rises and triggers a third fire-fighting threshold, the third fire-fighting threshold being greater than the second shutdown threshold.

[0039] In some technical solutions, optionally, the control unit is further configured to synchronize the safe protection state information to an energy storage cloud platform, so that the energy storage cloud platform pushes the safe protection state information to a user terminal.

[0040] In some technical solutions, optionally, the control unit is further configured to synchronize the fire alarm information to the energy storage cloud platform, so that the energy storage cloud platform sends the fire alarm information to at least one target terminal, the at least one target terminal including a fire alarm platform and / or a user terminal.

[0041] In some embodiments, the control unit is configured to: if the key electrical connection terminal is a photovoltaic connection terminal, control the maximum power point tracking controller to actively deviate from the maximum power point to stepwise reduce the photovoltaic direct current input power; if the key electrical connection terminal is an alternating current connection terminal, control the inverter of the energy storage device to stepwise reduce the alternating current output power in a plurality of preset power levels; and if the key electrical connection terminal is a direct current connection terminal, control the inverter to stepwise reduce the direct current output power in a plurality of preset power levels.

[0042] In some embodiments, the current flowing through the key electrical connection terminal is stepwise reduced in a plurality of preset input / output power levels; after each reduction of an input / output power level, the real-time temperature of the key electrical connection terminal is continuously monitored; and if the real-time temperature stops rising or starts falling, the energy storage device is controlled to maintain the current input / output power.

[0043] Additional aspects and advantages of the present application will become apparent from the following description with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0045] Figure 1 FIG. 1 shows a flowchart of a safety monitoring method of an energy storage device according to an embodiment of the present application;

[0046] Figure 2 FIG. 2 shows a flowchart of a safety monitoring method of an energy storage device according to another embodiment of the present application;

[0047] Figure 3 FIG. 3 shows a flowchart of a safety monitoring method of an energy storage device according to another embodiment of the present application;

[0048] Figure 4 FIG. 4 shows a flowchart of a safety monitoring method of an energy storage device according to another embodiment of the present application;

[0049] Figure 5 FIG. 5 shows a flowchart of a safety monitoring method of an energy storage device according to another embodiment of the present application;

[0050] Figure 6 FIG. 6 shows a structural block diagram of an energy storage device according to an embodiment of the present application;

[0051] Figure 7 FIG. 7 shows a structural block diagram of an energy storage device according to another embodiment of the present application;

[0052] Figure 8 FIG. 8 shows a structural block diagram of a safety monitoring device of an energy storage device according to an embodiment of the present application.

[0053] Figure label:

[0054] 700 Safety monitoring device for energy storage equipment, 702 Acquisition unit, 704 Comparison unit, 706 Control unit. Detailed Implementation

[0055] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0056] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0057] The following is combined with Figures 1 to 8 The present application provides a detailed description of the safety monitoring method, apparatus, and energy storage device for energy storage through specific embodiments and application scenarios.

[0058] like Figure 1 As shown, an embodiment of this application provides a safety monitoring method for an energy storage device, including:

[0059] Step 102: Based on the temperature sensors deployed on the key electrical connection terminals of the energy storage device, collect the real-time temperature of the key electrical connection terminals in real time;

[0060] Step 104: Compare the real-time temperature with the preset multi-level temperature thresholds, wherein the multi-level temperature thresholds include a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold.

[0061] Step 106: When the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is activated: control the energy storage device to gradually reduce the input and output power of the key electrical connection terminals until the real-time temperature is lower than the first warning threshold.

[0062] Step 108: If the real-time temperature is greater than or equal to the second shutdown threshold, activate the second response strategy: control the energy storage device to enter the safety protection state.

[0063] The safety monitoring method of the energy storage device provided in the application can be used for safety monitoring of the energy storage device during operation of the energy storage device. Specifically, the energy storage device includes a plurality of key electrical connection terminals. Through the key electrical connection terminals, electrical connection between the energy storage device and external devices can be achieved, and then the energy storage device can receive and deliver electric energy. The temperature sensors are arranged on the plurality of key electrical connection terminals. Through the temperature sensors, the temperature of the key electrical connection terminals can be detected, so that corresponding processing can be performed in time when the temperature of the key electrical connection terminals is too high, so as to ensure safe operation of the energy storage device.

[0064] It should be noted that the energy storage device can be a consumer-level energy storage device, that is, the energy storage device is used to meet the power demand of personal users in life and can provide the required electric energy for users. Specifically, the energy storage device can include a portable energy storage device for meeting the mobile power demand of users outdoors. The energy storage device can also include a user energy storage device, specifically including a balcony photovoltaic energy storage device and a household energy storage device, etc., for meeting the power demand of household appliances and other power loads in the life of users.

[0065] During operation of the energy storage device, the temperature sensors arranged on the key electrical connection terminals of the energy storage device are used to collect the real-time temperature of the key electrical connection terminals in real time, and then the real-time temperature is compared with the preset multi-level temperature threshold. The multi-level temperature threshold can be preset according to the historical operation data of the energy storage device. The multi-level temperature threshold can specifically include a first warning threshold and a second shutdown threshold. It can be understood that when the temperature of the key electrical connection terminal reaches the first warning threshold, it indicates that the temperature of the key electrical connection terminal is too high, but it will not immediately cause a fire or other serious consequences. At this time, the temperature of the key electrical connection terminal can be reduced by adjusting the operation parameters of the energy storage device, so as to avoid damage to the hardware of the energy storage device or even a fire caused by the continuous increase of the temperature of the key electrical connection terminal. Correspondingly, when the temperature of the key electrical connection terminal reaches the second shutdown threshold, it indicates that the temperature of the key electrical connection terminal at this time has caused a fire or other serious consequences. At this time, corresponding protection measures need to be taken to rapidly reduce the temperature of the key electrical connection terminal to avoid serious consequences.

[0066] Specifically, in the case that the temperature of the critical electrical connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy can be started, and in the case of the first response strategy, the temperature of the critical electrical connection terminal is reduced by gradually reducing the input and output power of the critical electrical connection terminal through the control of the energy storage device. It can be understood that in the process of transmitting electrical energy by the critical electrical connection terminal, the greater the input and output power of the critical electrical connection terminal, the more heat is generated in the process of transmitting electrical energy. Therefore, in the case that the temperature of the critical electrical connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the temperature of the critical electrical connection terminal is too high, but it will not immediately cause a fire or other serious consequences. By gradually reducing the input and output power of the critical electrical connection terminal, the heat generated in the process of transmitting electrical energy is reduced, thereby achieving the purpose of reducing the temperature of the critical electrical connection terminal.

[0067] It should be noted that gradually reducing the input and output power of the critical electrical connection terminal can be gradually reducing the input and output power according to different power levels, for example, the power levels can include a first level, a second level and a third level, the input and output power corresponding to the first level is greater than the input and output power corresponding to the second level, and the input and output power corresponding to the second level is greater than the input and output power corresponding to the third level. In the case that the temperature of the critical electrical connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the input and output power of the critical electrical connection terminal is first controlled by the energy storage device to be reduced from the current power to the input and output power corresponding to the first level, and the real-time temperature of the critical electrical connection terminal is monitored in real time by the temperature sensor. If the real-time temperature decreases, the input and output power of the critical electrical connection terminal can be controlled to return to the rated power after the real-time temperature decreases below the first warning threshold. On the contrary, if the real-time temperature does not decrease within a period of time, the input and output power of the critical electrical connection terminal is controlled by the energy storage device to be reduced from the current input and output power corresponding to the first level to the input and output power corresponding to the second level. If the real-time temperature still does not decrease within a period of time, the input and output power of the critical electrical connection terminal is controlled by the energy storage device to be reduced from the current input and output power corresponding to the second level to the input and output power corresponding to the third level, until the real-time temperature decreases below the first warning threshold, to ensure the safe operation of the energy storage device.

[0068] If the real-time temperature of the key electrical connection terminal is detected to be greater than or equal to the second shutdown threshold, it indicates that the temperature of the current key electrical connection terminal is too high, which may cause a fire and other serious consequences. At this time, the second corresponding strategy can be started, and under the second corresponding strategy, the control of the energy storage device into the safety protection state can be realized. It can be understood that in the safety protection state, the temperature of the key electrical connection terminal can be rapidly reduced, for example, the energy storage device can be directly controlled to stop running, and then the power transmission through the key electrical connection terminal is stopped, and in the case that there is no current passing through the key electrical connection terminal, the heat generation is stopped, and then the temperature is rapidly reduced, thereby avoiding the occurrence of a fire and other serious accidents, and ensuring the safety of the energy storage device.

[0069] The safety monitoring method of the energy storage device provided in the present application detects the actual temperature of the key electrical connection terminal of the energy storage device in real time, so that in the case that the real-time temperature of the connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is started, so that the temperature is reduced by controlling the energy storage device to gradually reduce the input and output power of the key electrical connection terminal, thereby avoiding thermal runaway. In the case that the temperature of the key electrical connection terminal is greater than or equal to the second shutdown threshold, the second corresponding strategy is started, so that the energy storage device is controlled to enter the safety protection state, thereby avoiding a fire and other serious situations of the energy storage device, and ensuring the safety of the energy storage device. Compared with the way of directly controlling the energy storage device to stop running when the real-time temperature of the key electrical connection terminal is too high, the basic electricity use of the user can be ensured on the basis of avoiding thermal runaway of the energy storage device, and the direct power-off does not bring great influence to the user's electricity use process.

[0070] In some embodiments, optionally, the key electrical connection terminal includes at least one of a photovoltaic connection terminal, an alternating current connection terminal, and a direct current connection terminal.

[0071] In this embodiment, the energy storage device can include a plurality of key electrical connection terminals, each of which is used to connect with different external devices, thereby realizing the power transmission between the energy storage device and the external devices.

[0072] Specifically, as Figure 6As shown, the energy storage device can be connected to a photovoltaic (PV) system. Correspondingly, the energy storage device can be connected to the PV system via PV connection terminals, thereby transmitting the electrical energy generated by the PV system to the energy storage device. Simultaneously, the energy storage device can also be connected to electrical loads and the power grid. The energy storage device can convert the DC power generated by the PV system, or the DC power stored in its own energy storage battery, into AC power to supply the electrical loads or transmit surplus power to the grid. Accordingly, key electrical connection terminals can include AC connection terminals, which can be grid-connected or off-grid connected terminals. Grid-connected terminals are connected to the power grid, and electrical loads can be connected to the branch between the grid-connected terminals and the power grid, thus simultaneously supplying power to the electrical loads through the energy storage device and the power grid. Off-grid connection terminals are connected to the electrical loads and can provide emergency backup power for these loads during power outages.

[0073] Optionally, such as Figure 7 As shown, the energy storage device may also include DC connection terminals. The energy storage device includes an integrated energy storage unit and at least one energy storage power pack. The integrated energy storage unit and the energy storage power pack are stacked. DC connection terminals are provided on adjacent surfaces of the integrated energy storage unit and the energy storage power pack, as well as between energy storage power packs. Through the connection of the respective DC connection terminals on the stacked surfaces, parallel expansion of the integrated energy storage unit and the energy storage power pack can be achieved. In other words, by stacking the energy storage power packs, the power capacity of the entire energy storage device is expanded to increase the total amount of electrical energy that the energy storage device can store, meeting the user's electricity demand. DC power transmission between the integrated energy storage unit and multiple energy storage power packs is achieved through the DC connection terminals. Each energy storage power pack includes a battery module and an Energy Management System (EMS). The Energy Management System can manage the parameters of power transmission for each energy storage power pack.

[0074] It can be understood that these key electrical connection terminals usually have a large current passing through during the operation of the energy storage device to meet the demand of power transmission, and these key electrical connection terminals can be exposed to complex environments (such as temperature changes, humidity, vibration) for a long time, or be prone to oxidation, corrosion or loosening due to installation process differences, resulting in an increase in the contact resistance of the key electrical connection terminals, and in turn generating a large amount of heat in the process of transmitting electric energy, and the temperature rises. By detecting the real-time temperature of the key electrical connection terminals, when the real-time temperature of the connection terminals is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is started, so as to reduce the temperature by gradually reducing the input and output power of the key electrical connection terminals of the energy storage device, thereby avoiding thermal runaway. When the temperature of the key electrical connection terminals is greater than or equal to the second shutdown threshold, the second corresponding strategy is started, so as to control the energy storage device to enter a safe protection state, avoid the energy storage device from catching fire and other serious situations, and ensure the safety of the energy storage device.

[0075] In some embodiments, optionally, controlling the energy storage device to enter a safe protection state includes: controlling the inverter of the energy storage device to shut down, and / or, controlling the battery module of the energy storage device to shut down.

[0076] In this embodiment, if it is detected that the real-time temperature of the key electrical connection terminals is greater than or equal to the second shutdown threshold, it means that the temperature of the current key electrical connection terminals is too high, which can cause fire and other serious consequences. At this time, the second corresponding strategy can be started, and under the second corresponding strategy, the energy storage device can be controlled to enter a safe protection state.

[0077] Specifically, as shown in Figure 6 The energy storage device can include an inverter, and controlling the energy storage device to enter a safe protection state can be to control the inverter of the energy storage device, so that the energy storage device stops converting direct current into alternating current through the alternating current connection terminal to supply power to the power load or transmit to the power grid. Specifically, the alternating current connection terminal can be a grid-connected connection terminal or an off-grid connection terminal. By controlling the inverter of the energy storage device to shut down, the output of alternating current can be stopped, that is, there is no current passing through in the grid-connected connection terminal and the off-grid connection terminal, so that no heat is generated in the alternating current connection terminal, and the purpose of rapid cooling of the alternating current connection terminal is achieved.

[0078] Alternatively, the control of the energy storage device into the safety protection state can be to control the energy storage all-in-one machine and the battery module in the plurality of energy storage power-on packages to be turned off. After the battery module is turned off, the direct current no longer passes through the key electrical connection terminal, so that the key electrical connection terminal no longer generates heat, that is, the direct current connection terminal between the energy storage all-in-one machine and the plurality of energy storage power-on packages no longer passes through the direct current, so as to achieve the purpose of rapid cooling of the direct current connection terminal.

[0079] As shown in Figure 2 The embodiment of the present application provides a safety monitoring method of an energy storage device, which comprises the following steps:

[0080] In step 202, the real-time temperature of the key electrical connection terminal is collected in real time based on the temperature sensor arranged on the key electrical connection terminal of the energy storage device.

[0081] In step 204, the real-time temperature is compared with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds comprise a first warning threshold and a second turn-off threshold, and the second turn-off threshold is greater than the first warning threshold.

[0082] In step 206, when the real-time temperature is greater than or equal to the first warning threshold and less than the second turn-off threshold, a first response strategy is started: the input and output power of the key electrical connection terminal of the energy storage device is controlled to be gradually reduced until the real-time temperature is lower than the first warning threshold.

[0083] In step 208, when the real-time temperature is greater than or equal to the second turn-off threshold, a second response strategy is started: the energy storage device is controlled to enter a safety protection state.

[0084] In step 210, the real-time temperature of the key electrical connection terminal is continuously monitored, and when the real-time temperature falls and is lower than the first warning threshold, the energy storage device is controlled to be out of the safety protection state and re-enter a rated working state.

[0085] In this embodiment, if it is detected that the real-time temperature of the key electrical connection terminal is greater than or equal to the second turn-off threshold, it indicates that the temperature of the current key electrical connection terminal is too high, which may cause fire and other serious consequences. At this time, the second corresponding strategy can be started, and in the second corresponding strategy, the energy storage device can be controlled to enter a safety protection state.

[0086] In the case that the energy storage device is in the safety protection state, the real-time temperature of the key electrical connection terminal can be continuously monitored. If the real-time temperature is still high, for example, the real-time temperature is still greater than or equal to the second shutdown threshold, or the real-time temperature is greater than the first warning threshold, it indicates that the real-time temperature of the key electrical connection terminal is still high, and the energy storage device is controlled to be in the safety protection state to avoid serious situations such as fire. On the contrary, if the real-time temperature falls below the first warning threshold, it indicates that the key electrical connection terminal can normally transmit electrical energy, and the energy storage device can be controlled to exit the safety protection state and re-enter the rated working state to ensure the power supply and provide better power experience for users.

[0087] As shown in Figure 3 The safety monitoring method of the energy storage device provided in the embodiment of the present application includes:

[0088] In step 302, the real-time temperature of the key electrical connection terminal is collected in real time based on the temperature sensor deployed on the key electrical connection terminal of the energy storage device.

[0089] In step 304, the real-time temperature is compared with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds include a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold.

[0090] In step 306, when the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, a first response strategy is started: the input and output power of the key electrical connection terminal of the energy storage device is gradually reduced until the real-time temperature is lower than the first warning threshold.

[0091] In step 308, when the real-time temperature is greater than or equal to the second shutdown threshold, a second response strategy is started: the energy storage device is controlled to enter a safety protection state.

[0092] In step 310, the real-time temperature of the key electrical connection terminal is continuously monitored, and when the real-time temperature continuously rises and triggers a third fire-fighting threshold, a fire-fighting module of the energy storage device is controlled to release a fire extinguishing agent, and the third fire-fighting threshold is greater than the second shutdown threshold.

[0093] In this embodiment, if it is detected that the real-time temperature of the key electrical connection terminal is greater than or equal to the second shutdown threshold, it indicates that the temperature of the current key electrical connection terminal is too high, which may cause serious consequences such as fire. At this time, the second response strategy can be started, and in the second response strategy, the energy storage device can be controlled to enter the safety protection state.

[0094] In the case that the energy storage device is in the safety protection state, the real-time temperature of the key electrical connection terminal can be continuously monitored. If the real-time temperature continues to rise and is greater than a third fire threshold, and the third fire threshold is greater than the second shutdown threshold, it indicates that the temperature of the current key electrical connection terminal has a high probability of fire or other serious conditions. At this time, the fire extinguishing module of the energy storage device can be controlled to release fire extinguishing agent, so as to realize the isolation of oxygen by the fire extinguishing agent and avoid fire caused by high temperature. In the case that the energy storage device has already caught fire, the function of fire extinguishing can also be realized. Specifically, as shown in Figure 6 the battery management system (BMS) of the energy storage device can be used to control the fire extinguishing module to release the fire extinguishing agent.

[0095] Specifically, the fire extinguishing agent can include inert gas, fire-fighting foam, etc.

[0096] As shown in Figure 4 the embodiments of the present application provide a safety monitoring method of an energy storage device, which comprises:

[0097] Step 402, based on the temperature sensor deployed at the key electrical connection terminal of the energy storage device, the real-time temperature of the key electrical connection terminal is collected in real time;

[0098] Step 404, comparing the real-time temperature with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds comprise a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold;

[0099] Step 406, in the case that the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, a first response strategy is started: the input and output power of the key electrical connection terminal of the energy storage device is controlled to be gradually reduced until the real-time temperature is lower than the first warning threshold;

[0100] Step 408, in the case that the real-time temperature is greater than or equal to the second shutdown threshold, a second response strategy is started: the energy storage device is controlled to enter the safety protection state;

[0101] Step 410, synchronizing the safety protection state information to the energy storage cloud platform, so as to push the safety protection state information to the user terminal by the energy storage cloud platform.

[0102] In this embodiment, in the case that the energy storage device is in the safety protection state, the energy storage device can also be controlled to synchronize the safety protection state information to the energy storage cloud platform, that is, the case that the energy storage device is in the safety protection state is sent to the energy storage cloud platform, and at the same time, the energy storage cloud platform can push the case that the energy storage device is in the safety protection state to the user terminal, so that the user can learn in time that the energy storage device currently enters the safety protection state due to the overhigh temperature of the key electrical connection terminal, and then the user can process the energy storage device in time to ensure the safe operation of the energy storage device.

[0103] Specifically, as shown in Figure 6 The energy storage device can include an energy management system (EMS), and through the energy management system, the synchronization of the safety protection state information can be realized.

[0104] The user terminal can be a terminal device of a user using the energy storage device, or can also be a terminal device of a maintenance personnel of the energy storage device, and the terminal device can be a mobile phone, a computer or other electronic device of the user.

[0105] As shown in Figure 5 The embodiment of the present application provides a safety monitoring method of an energy storage device, which includes:

[0106] Step 502, based on the temperature sensor deployed at the key electrical connection terminal of the energy storage device, the real-time temperature of the key electrical connection terminal is collected in real time;

[0107] Step 504, comparing the real-time temperature with a plurality of temperature thresholds, wherein the plurality of temperature thresholds include a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold;

[0108] Step 506, in the case that the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, a first response strategy is started: the input and output power of the key electrical connection terminal of the energy storage device is controlled to be gradually reduced until the real-time temperature is lower than the first warning threshold;

[0109] Step 508, in the case that the real-time temperature is greater than or equal to the second shutdown threshold, a second response strategy is started: the energy storage device is controlled to enter the safety protection state;

[0110] Step 510, the real-time temperature of the key electrical connection terminal is continuously monitored, and when the real-time temperature continuously rises and triggers a third fire-fighting threshold, a fire-fighting module of the energy storage device is controlled to release fire extinguishing agent, and the third fire-fighting threshold is greater than the second shutdown threshold;

[0111] In step 512, the fire alarm information is synchronized to the energy storage cloud platform, so that the energy storage cloud platform sends the fire alarm information to at least one target terminal, and the at least one target terminal includes the fire alarm platform and / or the user terminal.

[0112] In this embodiment, when the real-time temperature of the key electrical connection terminal continues to rise and is greater than the third fire threshold, it indicates that the temperature of the current key electrical connection terminal has a high probability of fire or other serious conditions, at which time the fire extinguishing agent of the fire module of the energy storage device can be controlled to release, so as to realize the isolation of oxygen by the fire extinguishing agent, avoid the temperature from being too high to cause fire, and also realize the function of fire extinguishing in the case of fire of the energy storage device. At the same time, the energy management system of the energy storage device can also synchronize the fire alarm information to the energy storage cloud platform, that is, the situation that the fire module of the energy storage device has been triggered is sent to the energy storage cloud platform, and at the same time, the energy storage cloud platform can push the situation that the fire module of the energy storage device has been triggered to at least one target terminal.

[0113] Among them, the target terminal can be the fire alarm platform, so that the fire alarm can reach the site where the energy storage device is located in time, and then timely response is made to avoid the energy storage device from catching fire, or in the case of fire of the energy storage device, the fire alarm can timely extinguish the fire. Or the target terminal can also be a user terminal using the energy storage device, so that the user terminal can timely process the energy storage device to avoid the energy storage device from catching fire, or timely extinguish the fire of the energy storage device.

[0114] In some embodiments, optionally, the input and output power of the key electrical connection terminal is controlled to be gradually reduced, including: if the key electrical connection terminal is a photovoltaic connection terminal, a maximum power point tracking controller is controlled to actively deviate from a maximum power point to reduce the photovoltaic direct current input power in a step-by-step manner; if the key electrical connection terminal is an alternating current connection terminal, an inverter of the energy storage device is controlled to reduce the alternating current output power in a step-by-step manner at a plurality of preset power gears; and if the key electrical connection terminal is a direct current connection terminal, the inverter is controlled to reduce the direct current output power in a step-by-step manner at a plurality of preset power gears.

[0115] In this embodiment, in the case that the temperature of the key electrical connection terminal is greater than or equal to the first early warning threshold and less than the second shutdown threshold, the first response strategy can be started, and in the case of the first response strategy, the temperature of the key electrical connection terminal is reduced by controlling the energy storage device to gradually reduce the input and output power of the key electrical connection terminal.

[0116] Specifically, different control methods can be implemented according to different types of key electrical connection terminals to reduce the real-time temperature of the key electrical connection terminals. If the key electrical connection terminal is a photovoltaic connection terminal, the maximum power point tracking (MPPT) controller of the energy storage device can be controlled to operate so that the direct current input power of the photovoltaic system deviates from the maximum power point, that is, the photovoltaic direct current input power of the photovoltaic connection terminal is reduced to reduce the heat generation. Moreover, in the process of reducing the photovoltaic direct current input power of the photovoltaic connection terminal, it can be reduced in a step-by-step manner, that is, the photovoltaic direct current input power is first reduced by a preset offset, and the real-time temperature of the photovoltaic connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the photovoltaic direct current input power is again reduced by a preset offset, and the temperature of the photovoltaic connection terminal is continuously monitored. If the temperature still does not decrease, the photovoltaic direct current input power is again reduced by a preset offset, until the real-time temperature of the photovoltaic connection terminal decreases to below the first warning threshold.

[0117] If the key electrical connection terminal is an alternating current connection terminal, the operating parameters of the inverter of the energy storage device can be controlled to reduce the alternating current output power of the alternating current connection terminal to reduce the temperature of the alternating current connection terminal. Similarly, in the process of reducing the alternating current output power of the alternating current connection terminal, it can also be reduced and adjusted in a step-by-step manner of preset power levels, for example, the preset power levels can include a first level, a second level and a third level, the alternating current output power corresponding to the first level is greater than the alternating current output power corresponding to the second level, and the alternating current output power corresponding to the second level is greater than the alternating current output power corresponding to the third level. First, the operating parameters of the inverter can be controlled to reduce the alternating current output power to the alternating current output power corresponding to the first level, and the real-time temperature of the alternating current connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the alternating current output power is controlled to reduce to the alternating current output power corresponding to the second level, and the real-time temperature of the alternating current connection terminal is continuously monitored. If the temperature still continues to rise or does not decrease, the alternating current output power is controlled to reduce to the alternating current output power corresponding to the third level, until the real-time temperature of the alternating current connection terminal decreases to below the first warning threshold.

[0118] If the key electrical connection terminal is a DC connection terminal, the operating parameters of the inverter of the energy storage device can be controlled to reduce the DC output power of the DC connection terminal to reduce the temperature of the DC connection terminal. Similarly, the DC output power of the DC connection terminal can also be reduced in a preset power level stepwise manner, for example, the preset power levels can include a first level, a second level and a third level, the DC output power corresponding to the first level is greater than the DC output power corresponding to the second level, and the DC output power corresponding to the second level is greater than the DC output power corresponding to the third level. First, the operating parameters of the inverter can be controlled to reduce the DC output power to the DC output power corresponding to the first level, and the real-time temperature of the DC connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the DC output power is controlled to decrease to the DC output power corresponding to the second level, and the real-time temperature of the DC connection terminal is continuously monitored. If the temperature continues to rise or does not decrease, the DC output power is controlled to decrease to the DC output power corresponding to the third level, until the real-time temperature of the DC connection terminal decreases to below the first warning threshold.

[0119] In some embodiments, optionally, the energy storage device is controlled to reduce the input and output power of the key electrical connection terminal step by step, including: reducing the current flowing through the key electrical connection terminal in a plurality of preset input and output power levels; after each input and output power level is reduced, the real-time temperature of the key electrical connection terminal is continuously monitored; if the real-time temperature stops rising or starts to decrease, the energy storage device is controlled to maintain the current input and output power.

[0120] In this embodiment, the energy storage device is controlled to reduce the input and output power of the key electrical connection terminal step by step, which can reduce the input and output power according to a plurality of preset input and output levels. After each input and output power level is reduced, the real-time temperature of the key electrical connection terminal can be continuously detected. If the real-time temperature does not decrease, the input and output power level is reduced again, and the real-time temperature of the key electrical connection terminal is continuously detected. If the real-time temperature still does not decrease, the input and output power level is reduced again. If the temperature stops rising or starts to decrease, the energy storage device is controlled to operate at the current input and output power, thereby avoiding accidents caused by excessive temperature while ensuring continuous power supply of the energy storage device.

[0121] For example, the input and output power levels can include a first level, a second level and a third level, the input and output power corresponding to the first level is greater than the input and output power corresponding to the second level, and the input and output power corresponding to the second level is greater than the input and output power corresponding to the third level. In the case that the critical electrical connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the energy storage device is first controlled to reduce the input and output power of the critical electrical connection terminal from the current input and output power to the input and output power corresponding to the first level, and the real-time temperature of the critical electrical connection terminal is monitored in real time by the temperature sensor. If the real-time temperature does not decrease within a period of time, the energy storage device is continuously controlled to reduce the input and output power of the critical electrical connection terminal from the current input and output power corresponding to the first level to the input and output power corresponding to the second level, and if the real-time temperature still does not decrease within a period of time, the energy storage device is continuously controlled to reduce the input and output power of the critical electrical connection terminal from the current input and output power corresponding to the second level to the input and output power corresponding to the third level. Conversely, if the real-time temperature stops rising or starts to decrease, the input and output power of the critical electrical connection terminal can be controlled to remain at the current input and output power, thereby avoiding accidents caused by excessively high temperature while ensuring continuous power supply of the energy storage device.

[0122] In some embodiments, optionally, an energy storage device is provided, comprising a battery module, an inverter and a master control unit; the battery module is used for storing or outputting electric energy; the inverter is used for AC / DC conversion; and the master control unit is used for executing the safety monitoring method of the energy storage device according to any one of the above technical solutions.

[0123] The energy storage device provided in the present application comprises a battery module, an inverter and a master control unit, wherein the battery module can be used for storing or outputting electric energy. Specifically, the energy storage device can be connected to a photovoltaic system, and the electric energy generated by the photovoltaic system can be transmitted and stored in the battery module of the energy storage device. The energy storage device can also be connected to an electrical load and a power grid, and the direct current provided by the battery module can be converted into alternating current by the inverter and transmitted to the electrical load and the power grid.

[0124] Optionally, the energy storage device can further comprise a master control unit, which is used for controlling the operation process of the energy storage device and can be used for implementing the steps of the safety monitoring method of the energy storage device according to any one of the above technical solutions. Therefore, the energy storage device has all the beneficial effects of the safety monitoring method of the energy storage device according to any one of the above technical solutions, which will not be described here again.

[0125] In some embodiments, optionally, as Figure 8As shown, a safety monitoring device 700 of an energy storage device is provided, comprising: an acquisition unit 702 configured to acquire a real-time temperature of a key electrical connection terminal of the energy storage device based on a temperature sensor disposed at the key electrical connection terminal; a comparison unit 704 configured to compare the real-time temperature with a plurality of preset temperature thresholds, wherein the plurality of temperature thresholds comprises a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold; and a control unit 706 configured to: in a case where the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, start a first response strategy, that is, control the energy storage device to gradually reduce input and output power of the key electrical connection terminal until the real-time temperature is lower than the first warning threshold; and in a case where the real-time temperature is greater than or equal to the second shutdown threshold, start a second response strategy, that is, control the energy storage device to enter a safety protection state.

[0126] The safety monitoring device 700 of the energy storage device provided in the present application detects the real-time temperature of the key electrical connection terminal of the energy storage device, so that in a case where the real-time temperature of the connection terminal is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is started, so that the temperature is reduced by controlling the energy storage device to gradually reduce the input and output power of the key electrical connection terminal, thereby avoiding thermal runaway. In a case where the temperature of the key electrical connection terminal is greater than or equal to the second shutdown threshold, the second response strategy is started, so that the energy storage device is controlled to enter a safety protection state, thereby avoiding a serious situation such as fire of the energy storage device and ensuring the safety of the energy storage device. Compared with the method of directly controlling the energy storage device to stop running when the real-time temperature of the key electrical connection terminal is too high, the basic electricity use of the user can be ensured on the basis of avoiding thermal runaway of the energy storage device, and the direct power-off does not bring great influence to the electricity use process of the user.

[0127] In some embodiments, optionally, the key electrical connection terminal comprises at least one of a photovoltaic connection terminal, an alternating current connection terminal, and a direct current connection terminal.

[0128] In some embodiments, optionally, the control unit 706 is specifically configured to control an inverter of the energy storage device to shut down, and / or control a battery module of the energy storage device to shut down.

[0129] In some embodiments, optionally, after the energy storage device enters the safety protection state, the acquisition unit 702 is further configured to continuously monitor the real-time temperature of the key electrical connection terminal, and the control unit 706 is further configured to control the energy storage device to exit the safety protection state and re-enter a rated working state when the real-time temperature falls below the first warning threshold.

[0130] In some embodiments, optionally, after controlling the energy storage device to enter the safety protection state, the acquisition unit 702 is further configured to continuously monitor the real-time temperature of the key electrical connection terminal, and the control unit 706 is further configured to control the fire extinguishing module of the energy storage device to release the fire extinguishing agent when the real-time temperature continuously rises and triggers a third fire threshold, the third fire threshold being greater than the second shutdown threshold.

[0131] In some embodiments, optionally, the control unit 706 is further configured to synchronize the safety protection state information to the energy storage cloud platform, so that the energy storage cloud platform pushes the safety protection state information to the user terminal.

[0132] In some embodiments, optionally, the control unit 706 is further configured to synchronize the fire alarm information to the energy storage cloud platform, so that the energy storage cloud platform sends the fire alarm information to at least one target terminal, the at least one target terminal including a fire alarm platform and / or a user terminal.

[0133] In some embodiments, optionally, the control unit 706 is specifically configured to: if the key electrical connection terminal is a photovoltaic connection terminal, control the maximum power point tracking controller to actively deviate from the maximum power point to stepwise reduce the photovoltaic direct current input power; if the key electrical connection terminal is an alternating current connection terminal, control the inverter of the energy storage device to stepwise reduce the alternating current output power at a plurality of preset power gears; and if the key electrical connection terminal is a direct current connection terminal, control the inverter to stepwise reduce the direct current output power at a plurality of preset power gears.

[0134] In some embodiments, optionally, the current flowing through the key electrical connection terminal is stepwise reduced at a plurality of preset input / output power gears; after each input / output power gear is reduced, the real-time temperature of the key electrical connection terminal is continuously monitored; and if the real-time temperature stops rising or starts falling, the energy storage device is controlled to maintain the current input / output power operation.

[0135] In the claims, specification, and drawings of the present application, the terms "one embodiment," "some embodiments,” "certain embodiments,” and the like are not necessarily all referring to the same embodiments, although they can. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0136] The specific embodiments described herein have many advantages resulting from the particular combination of features set forth. It is not intended that the application be limited to the specific embodiments described or shown. Various modifications can be made by those skilled in the art within the desired scope.

Claims

1. A safety monitoring method for an energy storage device, characterized in that, The method includes: Based on temperature sensors deployed at the key electrical connection terminals of the energy storage device, the real-time temperature of the key electrical connection terminals is collected in real time. The real-time temperature is compared with a preset multi-level temperature threshold, wherein the multi-level temperature threshold includes a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold. If the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, the first response strategy is activated: control the energy storage device to gradually reduce the input and output power of the key electrical connection terminals until the real-time temperature is lower than the first warning threshold; If the real-time temperature is greater than or equal to the second shutdown threshold, a second response strategy is initiated: the energy storage device is controlled to enter a safety protection state.

2. The security monitoring method according to claim 1, characterized in that, The key electrical connection terminals include at least one of photovoltaic connection terminals, AC connection terminals, and DC connection terminals.

3. The security monitoring method according to claim 2, characterized in that, The control of the energy storage device to enter a safety protection state includes: Control the inverter of the energy storage device to turn off, and / or control the battery module of the energy storage device to turn off.

4. The security monitoring method according to claim 3, characterized in that, After controlling the energy storage device to enter a safety protection state, the method further includes: The real-time temperature of the key electrical connection terminals is continuously monitored. When the real-time temperature drops below the first warning threshold, the energy storage device is controlled to release the safety protection state and re-enter the rated working state.

5. The security monitoring method according to claim 3, characterized in that, After controlling the energy storage device to enter a safety protection state, the method further includes: The real-time temperature of the key electrical connection terminals is continuously monitored. When the real-time temperature continues to rise and triggers the third fire threshold, the fire-fighting module of the energy storage device is controlled to release the fire extinguishing agent. The third fire threshold is greater than the second shutdown threshold.

6. The security monitoring method according to claim 1, characterized in that, After controlling the energy storage device to enter a safety protection state, the method further includes: The safety protection status information is synchronized with the energy storage cloud platform so that the energy storage cloud platform can push the safety protection status information to the user terminal.

7. The security monitoring method according to claim 5, characterized in that, After the fire-fighting module controlling the energy storage device releases the extinguishing agent, the method further includes: The fire alarm information is synchronized to the energy storage cloud platform so that the energy storage cloud platform can send the fire alarm information to at least one target terminal, the at least one target terminal including the fire alarm platform and / or user terminal.

8. The security monitoring method according to claim 2, characterized in that, The control of the energy storage device to progressively reduce the input and output power of the key electrical connection terminals includes: If the key electrical connection terminal is a photovoltaic connection terminal, the maximum power point tracking controller is controlled to actively deviate from the maximum power point in order to reduce the photovoltaic DC input power in a stepwise manner; If the key electrical connection terminal is an AC connection terminal, the inverter of the energy storage device is controlled to reduce the AC output power in a stepped manner with multiple preset power levels; If the key electrical connection terminal is a DC connection terminal, the inverter is controlled to reduce the DC output power in a stepped manner using the multiple preset power levels.

9. The security monitoring method according to claim 1, characterized in that, Controlling the energy storage device to progressively reduce the input and output power of the critical electrical connection terminals includes: The current flowing through the key electrical connection terminals is reduced in a stepped manner using multiple preset input and output power levels. After each reduction of the input / output power level, the real-time temperature of the key electrical connection terminals is continuously monitored. If the real-time temperature stops rising or begins to fall, the energy storage device is controlled to maintain the current input and output power.

10. An energy storage device, characterized in that, include: Battery module, inverter and main control unit; The battery module is used to store or output electrical energy; The inverter is used for AC-DC conversion; The main control unit is used to execute the safety monitoring method for energy storage devices as described in any one of claims 1-9.

11. A safety monitoring device for an energy storage device, characterized in that, include: The acquisition unit is used to acquire the real-time temperature of the key electrical connection terminals based on temperature sensors deployed on the key electrical connection terminals of the energy storage device. The comparison unit is used to compare the real-time temperature with a preset multi-level temperature threshold, wherein the multi-level temperature threshold includes a first warning threshold and a second shutdown threshold, and the second shutdown threshold is greater than the first warning threshold. The control unit is configured to, when the real-time temperature is greater than or equal to the first warning threshold and less than the second shutdown threshold, initiate a first response strategy: controlling the energy storage device to progressively reduce the input and output power of the critical electrical connection terminals until the real-time temperature is lower than the first warning threshold; and If the real-time temperature is greater than or equal to the second shutdown threshold, a second response strategy is initiated: the energy storage device is controlled to enter a safety protection state.

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