Energy storage system early warning monitoring method, early warning monitoring device and energy storage system

Abstract

The embodiment of the application discloses a kind of early warning monitoring method, early warning monitoring device and energy storage system of energy storage system.The energy storage system early warning monitoring method includes obtaining the temperature parameter of at least one battery pack;At least one insulation resistance value of the battery pack is obtained;According to the insulation resistance value of the battery pack and the temperature parameter, the thermal failure early warning state of the energy storage system is determined.The technical scheme provided in this embodiment has a shorter response time, improves the safety of the energy storage system, reduces the hardware loss and cost caused by the thermal failure of the energy storage system, and solves the problem of long response time and high hardware cost in the thermal failure detection method of the energy storage system.

Description

Technical Field

[0001] This invention relates to the field of energy storage safety protection technology, and in particular to an early warning monitoring method, an early warning monitoring device, and an energy storage system. Background Technology

[0002] Energy storage systems, as a key technology supporting the development of renewable energy, have ushered in tremendous development opportunities. Energy storage technology can not only serve as a supporting condition for renewable energy to maintain grid load and stability, but it can also be used independently to improve the energy structure, and can be integrated with new energy vehicles for charging capacity expansion and support. However, the large-scale deployment and operation of energy storage power stations has also brought difficulties and challenges to energy storage safety protection.

[0003] Currently, energy storage safety primarily employs two protective measures: First, passive fire suppression, mainly using a fire suppression control panel to extinguish fires with gas or water. However, if the system reignites after a single activation, no further fire suppression measures are available. Second, active fire suppression, but commercially available active fire suppression systems only collect and classify data based on real-time system temperature and the concentration of gases released from the battery cells, issuing a warning signal and directly disconnecting the high-voltage box. This technical solution neglects the system's shutdown request procedure. Furthermore, real-time data collection requires high data transmission rates, resulting in high hardware costs. When actively alerting to the risk of thermal failure, it does not consider whether the system has short-circuit faults, and directly cuts off auxiliary power, ignoring the fact that power loss for fire suppression and temperature control will exacerbate the consequences of thermal failure.

[0004] Existing methods for detecting thermal failures in energy storage systems suffer from long response times and high hardware costs. Summary of the Invention

[0005] This invention provides an early warning monitoring method, an early warning monitoring device, and an energy storage system to address the problems of long response time and high hardware cost in existing thermal failure detection methods for energy storage systems.

[0006] To address the aforementioned technical problems, the present invention adopts the following technical solution:

[0007] This invention provides an early warning monitoring method for energy storage systems, comprising:

[0008] Obtain the temperature parameters of at least one battery pack;

[0009] Obtain the insulation resistance value of at least one of the battery packs;

[0010] Based on the insulation resistance value of the battery pack and the temperature parameter, the pre-thermal failure warning state of the energy storage system is determined.

[0011] Optionally, obtaining the temperature parameters of the battery pack includes:

[0012] The temperature information of the air inside the battery pack is detected by a temperature and humidity detection board.

[0013] Temperature information of the surface of the battery cells inside the battery pack is obtained through temperature sensors;

[0014] Temperature weighting information is determined based on the air temperature information and the cell surface temperature information.

[0015] Optionally, determining the temperature-weighted information based on the air temperature information and the cell surface temperature information includes:

[0016] The temperature parameters of the battery pack are determined based on the difference between the air temperature information and the cell surface temperature information.

[0017] Optionally, obtaining the insulation resistance value of the battery pack includes:

[0018] The insulation impedance of the battery pack is monitored by the insulation monitoring module to obtain the insulation resistance value of the battery pack.

[0019] Optionally, determining the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter includes:

[0020] The insulation resistance value of the battery pack is compared with a preset resistance threshold to generate a first comparison result;

[0021] The temperature parameters of the battery pack are compared with a preset temperature threshold to generate a second comparison result;

[0022] Based on the first comparison result and the second comparison result, the pre-thermal failure state of the energy storage system is determined.

[0023] Optionally, determining the pre-thermal failure state of the energy storage system based on the first comparison result and the second comparison result includes:

[0024] When the insulation resistance value of a single battery pack is greater than a preset resistance threshold, or the temperature parameter of a single battery pack is greater than a preset temperature threshold, the energy storage system is determined to be in the first pre-thermal failure state.

[0025] When the insulation resistance value of at least two of the battery packs is greater than a preset resistance threshold, and the temperature parameter of at least two of the battery packs is greater than a preset temperature threshold, the energy storage system is determined to be in the second pre-thermal failure state.

[0026] Optionally, after determining the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter, the method further includes:

[0027] Based on the pre-thermal failure state of the energy storage system, pre-thermal failure protection is implemented for the energy storage system, and an alarm signal is triggered.

[0028] Optionally, the step of performing pre-thermal failure protection on the energy storage system and triggering an alarm signal based on the pre-thermal failure state of the energy storage system includes:

[0029] When the energy storage system is in the state before the first thermal failure, the converter is controlled to reduce power and a first-level alarm signal is triggered.

[0030] When the energy storage system is in the pre-second thermal failure state, the contactor in the high-voltage box of the control battery cluster is disconnected, triggering a secondary alarm signal.

[0031] According to another aspect of the present invention, this embodiment provides an early warning monitoring device for an energy storage system, comprising:

[0032] Temperature sensing module, used to acquire temperature parameters of at least one battery pack;

[0033] An insulation monitoring module is used to obtain the insulation resistance value of at least one of the battery packs;

[0034] The control module is used to determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter.

[0035] According to another aspect of the present invention, this embodiment provides an energy storage system, comprising:

[0036] At least one battery cluster, each battery cluster including at least one battery pack, and an energy storage system early warning monitoring device as proposed in the second aspect, the energy storage system early warning monitoring device being used to perform the energy storage system early warning monitoring method as described in any item of the first aspect.

[0037] The energy storage system early warning monitoring method provided in this embodiment of the invention obtains the temperature parameters and insulation resistance values ​​of at least one battery pack. Based on the insulation resistance values ​​and temperature parameters of the battery packs, it determines the pre-thermal failure early warning state of the energy storage system. This setup can effectively locate the pre-thermal failure early warning state of the energy storage system, thereby enabling timely monitoring of the battery pack-level operating status before thermal failure. By monitoring and issuing early warnings based on the insulation resistance values ​​and temperature parameters of the battery packs, the method can effectively monitor and issue early warnings for pre-thermal failure of the energy storage system. The energy storage system early warning monitoring method provided in this embodiment has a short response time, improving the safety of the energy storage system and reducing hardware losses and costs caused by thermal failure. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0039] Figure 1 This is a flowchart of an early warning monitoring method for an energy storage system provided by an embodiment of the present invention;

[0040] Figure 2 This is a flowchart of another early warning monitoring method for energy storage systems provided in an embodiment of the present invention;

[0041] Figure 3 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0042] Figure 4 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the insulation detection circuit of an energy storage system provided in an embodiment of the present invention;

[0044] Figure 6 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0045] Figure 7 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0046] Figure 8 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0047] Figure 9 This is a flowchart of another energy storage system early warning monitoring method provided by an embodiment of the present invention;

[0048] Figure 10 This is a schematic diagram of the structure of another energy storage system early warning and monitoring device provided in an embodiment of the present invention;

[0049] Figure 11 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present invention. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0051] Based on the above-mentioned technical problems, this embodiment proposes the following solutions:

[0052] Figure 1 This is a flowchart of an early warning monitoring method for an energy storage system provided by an embodiment of the present invention. See also... Figure 1 The energy storage system early warning monitoring method provided in this embodiment includes:

[0053] S101. Obtain the temperature parameters of at least one battery pack.

[0054] Specifically, the energy storage system includes at least one battery cluster, and each battery cluster includes at least one battery pack. Since the temperature of the battery pack will change to some extent before thermal failure occurs, acquiring the temperature parameters of at least one battery pack allows for temperature monitoring at the battery pack level. This enables the detection of temperature parameter changes before thermal failure, allowing for timely early warning.

[0055] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0056] Specifically, the insulation resistance of the battery pack changes before thermal failure occurs in an energy storage system. By obtaining the insulation resistance value of at least one battery pack, the health status of the battery pack can be effectively assessed.

[0057] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0058] Specifically, the temperature and humidity detection board and smoke sensor for thermal failure protection in energy storage systems are located at the battery cluster level, resulting in relatively weak sensitivity to thermal failure. Furthermore, the fire control system and the battery management system of the energy storage system are two independent systems, leading to a longer response time for fire protection after a thermal failure. This prolonged response time for fire protection after a thermal failure increases the hardware cost of the energy storage system. By setting the system to determine the temperature and insulation resistance of the energy storage system before thermal failure based on the insulation resistance and temperature parameters of the battery pack, the pre-thermal failure warning state of the energy storage system can be better located. This setup allows for timely monitoring of the battery pack-level operating status before thermal failure, providing monitoring and warnings based on the insulation resistance and temperature parameters of the battery pack. The shorter response time significantly improves the safety of the energy storage system and reduces hardware losses and costs caused by thermal failure.

[0059] The energy storage system early warning monitoring method provided in this embodiment obtains the temperature parameters and insulation resistance values ​​of at least one battery pack. Based on the insulation resistance values ​​and temperature parameters of the battery packs, it determines the pre-thermal failure early warning state of the energy storage system. This setup allows for better localization of the pre-thermal failure early warning state of the energy storage system, enabling timely monitoring of the battery pack-level operating status before thermal failure. By monitoring and issuing early warnings based on the insulation resistance and temperature parameters of the battery packs, the method provides a short response time, improving the safety of the energy storage system and reducing hardware losses and costs caused by thermal failure.

[0060] Optional, Figure 2 This is a flowchart of another early warning monitoring method for an energy storage system provided by an embodiment of the present invention. Based on the above embodiments, see [link to other embodiments]. Figure 2 The energy storage system early warning monitoring method provided in this embodiment includes:

[0061] S201. The temperature information of the air inside the battery pack is detected by the temperature and humidity detection board.

[0062] Specifically, a temperature and humidity detection board is installed inside the battery pack. This board can detect the temperature information of the air inside the battery pack, thereby obtaining the temperature information of the air inside the battery pack.

[0063] S202. Obtain temperature information of the surface of the battery cells in the battery pack through a temperature sensor.

[0064] Specifically, before a battery pack experiences thermal failure, the surface temperature of the battery cells will rise. Temperature sensors are placed on the surface of the battery cells within the battery pack to obtain temperature information about the cell surfaces.

[0065] S203. Determine temperature weighting information based on the air temperature information and the cell surface temperature information.

[0066] Specifically, the temperature change of the battery cell surface is affected by both the cell temperature and the air temperature inside the battery pack. By using temperature-weighted information from both the air temperature and the cell surface temperature, a pre-thermal failure warning state of the battery pack can be determined. This approach effectively avoids misjudging the pre-thermal failure warning state caused by high air temperature inside the battery pack, further improving the accuracy of pre-thermal failure warning state monitoring.

[0067] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0068] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0069] Optional, Figure 3 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 3 The energy storage system early warning monitoring method provided in this embodiment includes:

[0070] S201. The temperature information of the air inside the battery pack is detected by the temperature and humidity detection board.

[0071] S202. Obtain temperature information of the surface of the battery cells in the battery pack through a temperature sensor.

[0072] S301. Determine the temperature parameters of the battery pack based on the difference between the air temperature information and the cell surface temperature information.

[0073] Specifically, the temperature parameters of the battery pack are obtained by subtracting the temperature information of the air within the same battery pack from the temperature information of the surface of the battery cells. These temperature parameters eliminate the influence of the temperature information of the battery cell surfaces on the temperature of the air inside the battery pack, allowing the temperature parameters to more accurately characterize the state of the battery pack before thermal failure.

[0074] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0075] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0076] Optional, Figure 4 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 4 The energy storage system early warning monitoring method provided in this embodiment includes:

[0077] S101. Obtain the temperature parameters of at least one battery pack.

[0078] S401. The insulation impedance of the battery pack is monitored by the insulation monitoring module to obtain the insulation resistance value of the battery pack.

[0079] Specifically, the insulation impedance of each battery pack is monitored through an insulation monitoring module. This module may include an insulation detection circuit, which reuses the battery management unit (BMU). Figure 5 This is a schematic diagram illustrating the principle of an insulation detection circuit for an energy storage system according to an embodiment of the present invention. See also... Figure 5 The battery management unit (BMU) can be connected to both the positive and negative terminals of the battery. The positive terminal of the battery pack is connected to the first terminal of temperature switch K1, and the negative terminal is connected in series with a sampling standard resistor R0. The second terminal of the sampling standard resistor R0 is grounded. When the BMU emits a voltage square wave signal, temperature switch K1 closes. The voltage square wave signal flows through the entire battery pack and the sampling standard resistor R0 before being discharged to ground. Using the applied voltage square wave signal, the conductivity current shifting in the direction of the ion electric field can be measured, thus obtaining the insulation resistance value Ri. Temperature switch K1 can be linked to the temperature parameters acquired in the control unit; that is, when the temperature parameter is high, temperature switch K1 will automatically open.

[0080] The insulation resistance value Ri is calculated using the following formula:

[0081]

[0082] Where V1 is the positive voltage of the battery side, V2 is the negative voltage of the battery side, UB is the voltage value of the battery pack, R0 is the sampling standard resistor, for example, the resistance value of R0 can be set to 50Ω / V, ESR is the internal resistance of the battery pack, and K1 is the temperature switch.

[0083] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0084] Optional, Figure 6 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 6 The energy storage system early warning monitoring method provided in this embodiment includes:

[0085] S101. Obtain the temperature parameters of at least one battery pack.

[0086] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0087] S501. Compare the insulation resistance value of the battery pack with a preset resistance threshold to generate a first comparison result.

[0088] Specifically, a preset resistance threshold can be set as needed. The difference or quotient between the insulation resistance value of the battery pack and the preset resistance threshold is used to obtain the first comparison result.

[0089] S502. The temperature parameters of the battery pack are compared with a preset temperature threshold to generate a second comparison result.

[0090] Specifically, a preset temperature threshold can be set as needed. The difference or quotient between the temperature parameters of the battery pack and the preset temperature threshold is used to obtain a second comparison result.

[0091] S503. Based on the first comparison result and the second comparison result, determine the pre-thermal failure state of the energy storage system.

[0092] Specifically, the pre-thermal failure state of the energy storage system can be determined based on the first comparison result and the second comparison result. If the first comparison result indicates that the temperature parameter is greater than a preset temperature threshold, and the second comparison result indicates that the battery pack temperature parameter is greater than the preset temperature threshold, the energy storage system is determined to be in a pre-thermal failure state. Otherwise, the energy storage system is determined to be in normal operating condition.

[0093] Optional, Figure 7 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 7 The energy storage system early warning monitoring method provided in this embodiment includes:

[0094] S101. Obtain the temperature parameters of at least one battery pack.

[0095] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0096] S501. Compare the insulation resistance value of the battery pack with a preset resistance threshold to generate a first comparison result.

[0097] S502. The temperature parameters of the battery pack are compared with a preset temperature threshold to generate a second comparison result.

[0098] S601. When the insulation resistance value of a single battery pack is greater than a preset resistance threshold, or the temperature parameter of a single battery pack is greater than a preset temperature threshold, the energy storage system is determined to be in the first pre-thermal failure state.

[0099] Specifically, when the insulation resistance value of a single battery pack exceeds a preset resistance threshold, the energy storage system is determined to be in the first pre-thermal failure state. Alternatively, when the temperature parameter of a single battery pack exceeds a preset temperature threshold, the energy storage system is determined to be in the first pre-thermal failure state. The first pre-thermal failure state is an abnormal operating state of the battery pack prior to thermal failure at the battery pack level.

[0100] S602. When the insulation resistance value of at least two of the battery packs is greater than a preset resistance threshold, and the temperature parameter of at least two of the battery packs is greater than a preset temperature threshold, the energy storage system is determined to be in the second pre-thermal failure state.

[0101] Specifically, the urgency level of the second pre-thermal failure state is greater than that of the first pre-thermal failure state. The energy storage system is determined to have entered the second pre-thermal failure state when the insulation resistance values ​​of at least two battery packs are greater than a preset resistance threshold and the temperature parameters of at least two battery packs are greater than a preset temperature threshold.

[0102] Optional, Figure 8 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 8 The energy storage system early warning monitoring method provided in this embodiment includes:

[0103] S101. Obtain the temperature parameters of at least one battery pack.

[0104] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0105] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0106] S701. Based on the pre-thermal failure state of the energy storage system, perform pre-thermal failure protection on the energy storage system and trigger an alarm signal.

[0107] Specifically, the pre-thermal failure state can include a first pre-thermal failure state and a second pre-thermal failure state. Setting up pre-thermal failure protection for the energy storage system based on its pre-thermal failure state and triggering alarm signals allows for timely and targeted pre-thermal failure protection based on the determined state. This prevents the energy storage system from progressing from the pre-thermal failure state to full thermal failure, improving the response time of pre-thermal failure protection. Furthermore, by setting up alarm signals to trigger based on the pre-thermal failure state, the health status of the energy storage system can be reported promptly, facilitating its recording and further enhancing its safety.

[0108] Optional, Figure 9 This is a flowchart of another energy storage system early warning monitoring method provided in an embodiment of the present invention. Based on the above embodiments, see [link to related documentation]. Figure 9 The energy storage system early warning monitoring method provided in this embodiment includes:

[0109] S101. Obtain the temperature parameters of at least one battery pack.

[0110] S102. Obtain the insulation resistance value of at least one of the battery packs.

[0111] S103. Determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters.

[0112] S801. When the energy storage system is in the state before the first thermal failure, the converter is controlled to reduce power operation and a first-level alarm signal is triggered.

[0113] Specifically, when the energy storage system is in a state prior to the first thermal failure, the local control unit can request the energy management system to operate at reduced power. Responding to the control commands from the energy management system, the local control unit controls the inverter to operate at reduced power and triggers a first-level alarm signal. The local control unit can be a device-level control unit, which can communicate with the battery cluster-level control unit. The battery control unit can be located at the battery pack level, and the battery pack-level battery control unit can communicate with the battery cluster-level control unit.

[0114] S802. When the energy storage system is in the pre-second thermal failure state, the contactor in the high-voltage box of the control battery cluster is disconnected, and a secondary alarm signal is triggered.

[0115] Specifically, when the energy storage system is in the pre-second thermal failure state, the battery control unit sends a control signal to the charger BSC, which then controls the contactor in the high-voltage box of the battery cluster to disconnect and triggers a secondary alarm signal.

[0116] The energy storage system early warning monitoring method provided in this embodiment implements active electrical linkage to proactively block thermal failure of the battery cells before it occurs. It uses the detection method of battery pack resistance and temperature parameters to provide early warning of excessive temperature rise in the energy storage system, which is more reliable than early warning based on reducing gas concentration. Furthermore, because the transmission chain after the early warning provided by the energy storage system early warning monitoring method in this embodiment is shorter, the response is faster, and the early warning time is longer, further improving the safety of the energy storage system. Compared to adding smoke and temperature sensors and gas sensors to each battery pack, the energy storage system early warning monitoring method provided in this embodiment is lower in cost and makes better use of the energy storage system's own control system and communication structure, resulting in a simpler structure and less energy storage system loss.

[0117] Figure 10 This is a schematic diagram of another energy storage system early warning and monitoring device provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 10 The energy storage system early warning monitoring device 100 provided in this embodiment includes:

[0118] Temperature sensing module 91 is used to acquire temperature parameters of at least one battery pack;

[0119] Insulation monitoring module 92 is used to acquire the insulation resistance value of at least one of the battery packs;

[0120] The control module 93 is used to determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter.

[0121] Optional, the temperature sensing module includes:

[0122] Temperature and humidity detection board, used to detect the temperature information of the air inside the battery pack;

[0123] Temperature sensors are used to acquire temperature information of the surface of the battery cells inside the battery pack;

[0124] The temperature parameter determination unit is used to determine temperature weighting information based on the air temperature information and the cell surface temperature information.

[0125] Optionally, a temperature parameter determination unit is specifically used to determine the temperature parameters of the battery pack based on the difference between the air temperature information and the surface temperature information of the battery cell.

[0126] Optionally, the insulation monitoring module 92 is specifically used to monitor the insulation impedance of the battery pack and obtain the insulation resistance value of the battery pack.

[0127] Optionally, the control module 93 includes:

[0128] The first comparison unit is used to compare the insulation resistance value of the battery pack with a preset resistance threshold and generate a first comparison result;

[0129] The second comparison unit is used to compare the temperature parameters of the battery pack with a preset temperature threshold and generate a second comparison result.

[0130] The state determination unit is used to determine the pre-thermal failure state of the energy storage system based on the first comparison result and the second comparison result.

[0131] Optionally, the state determination unit is specifically used to: determine the energy storage system as a first pre-thermal failure state when the insulation resistance value of a single battery pack is greater than a preset resistance threshold, or the temperature parameter of a single battery pack is greater than a preset temperature threshold; and determine the energy storage system as a second pre-thermal failure state when the insulation resistance value of at least two battery packs is greater than the preset resistance threshold and the temperature parameter of at least two battery packs is greater than the preset temperature threshold.

[0132] Optionally, the energy storage system early warning monitoring device provided in this embodiment further includes:

[0133] The protection and early warning module is used to perform pre-thermal failure protection on the energy storage system based on the pre-thermal failure state of the energy storage system and trigger an alarm signal.

[0134] Optionally, the protection and early warning module is specifically used to: control the inverter to reduce power operation and trigger a first-level alarm signal when the energy storage system is in the first pre-thermal failure state; and control the contactor in the high-voltage box of the battery cluster to disconnect and trigger a second-level alarm signal when the energy storage system is in the second pre-thermal failure state.

[0135] The energy storage system early warning monitoring device provided in this embodiment acquires the temperature parameters of at least one battery pack through a temperature sensing module and the insulation resistance value of at least one battery pack through an insulation monitoring module. A control module determines the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameters. This energy storage system early warning monitoring device can effectively locate the pre-thermal failure warning state of the energy storage system, thereby enabling timely monitoring of the battery pack-level operating status before thermal failure. Based on the insulation resistance value and temperature parameters of the battery pack, it monitors and issues warnings for the energy storage system before thermal failure. The energy storage system early warning monitoring device provided in this embodiment has a short response time for determining the pre-thermal failure state and for protective actions, improving the safety of the energy storage system and reducing hardware losses and costs caused by thermal failure.

[0136] Figure 11This is a schematic diagram of an energy storage system provided in an embodiment of the present invention. Based on the above embodiment, see... Figure 11 The energy storage system 200 provided in this embodiment includes: at least one battery cluster 300, each battery cluster 300 including at least one battery pack 400, and an energy storage system early warning monitoring device 100 proposed in any of the above embodiments. The energy storage system early warning monitoring device 100 is used to execute the energy storage system early warning monitoring method proposed in any of the above embodiments. The energy storage system early warning monitoring device 100 can be disposed within the battery pack 400. The energy storage system 200 provided in this embodiment includes the energy storage system early warning monitoring device 100 proposed in any of the above embodiments and has the beneficial effects of the energy storage system early warning monitoring device 100 proposed in any of the above embodiments, which will not be elaborated here.

[0137] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for early warning monitoring of an energy storage system, characterized in that, include: Obtain the temperature parameters of at least one battery pack; Obtain the insulation resistance value of at least one of the battery packs; Obtaining the insulation resistance value of the battery pack includes: The insulation impedance of the battery pack is monitored by an insulation monitoring module to obtain the insulation resistance value of the battery pack, including: The battery management unit is connected to the positive and negative terminals of the battery. The positive terminal of the battery pack is connected to the first terminal of the temperature switch, and the negative terminal of the battery pack is connected in series with the sampling standard resistor. The second terminal of the sampling standard resistor is grounded. The battery management unit sends a voltage square wave signal, the temperature switch is closed, and the voltage square wave signal flows through the entire battery pack and the sampling standard resistor before being discharged to the ground. Using the applied voltage square wave signal, the conductivity current that moves in the direction of the electric field of the ions contained therein can be measured, thereby obtaining the insulation resistance value. Based on the insulation resistance value of the battery pack and the temperature parameters, the pre-thermal failure warning state of the energy storage system is determined. The step of determining the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter includes: The insulation resistance value of the battery pack is compared with a preset resistance threshold to generate a first comparison result, including: subtracting or quotienting the insulation resistance value of the battery pack from the preset resistance threshold to obtain the first comparison result; The comparison of the temperature parameters of the battery pack with a preset temperature threshold to generate a second comparison result includes: subtracting or quotienting the temperature parameters of the battery pack from the preset temperature threshold to obtain the second comparison result; Based on the first comparison result and the second comparison result, the pre-thermal failure state of the energy storage system is determined; The step of determining the pre-thermal failure state of the energy storage system based on the first comparison result and the second comparison result includes: When the insulation resistance value of a single battery pack is greater than a preset resistance threshold, or the temperature parameter of a single battery pack is greater than a preset temperature threshold, the energy storage system is determined to be in the first pre-thermal failure state. When the insulation resistance value of at least two of the battery packs is greater than a preset resistance threshold, and the temperature parameter of at least two of the battery packs is greater than a preset temperature threshold, the energy storage system is determined to be in the second pre-thermal failure state.

2. The method according to claim 1, characterized in that, Obtain the temperature parameters of the battery pack, including: The temperature information of the air inside the battery pack is detected by a temperature and humidity detection board. Temperature information of the surface of the battery cells inside the battery pack is obtained through temperature sensors; Temperature weighting information is determined based on the air temperature information and the cell surface temperature information.

3. The method according to claim 2, characterized in that, The step of determining temperature-weighted information based on the air temperature information and the cell surface temperature information includes: The temperature parameters of the battery pack are determined based on the difference between the air temperature information and the cell surface temperature information.

4. The method according to claim 1, characterized in that, After determining the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter, the method further includes: Based on the pre-thermal failure state of the energy storage system, pre-thermal failure protection is implemented for the energy storage system, and an alarm signal is triggered.

5. The method according to claim 4, characterized in that, The step of performing pre-thermal failure protection on the energy storage system based on its pre-thermal failure state and triggering an alarm signal includes: When the energy storage system is in the state before the first thermal failure, the converter is controlled to reduce power and a first-level alarm signal is triggered. When the energy storage system is in the pre-second thermal failure state, the contactor in the high-voltage box of the control battery cluster is disconnected, triggering a secondary alarm signal.

6. An early warning monitoring device for an energy storage system, characterized in that, include: Temperature sensing module, used to acquire temperature parameters of at least one battery pack; An insulation monitoring module is used to obtain the insulation resistance value of at least one of the battery packs; Obtaining the insulation resistance value of the battery pack includes: The insulation impedance of the battery pack is monitored by an insulation monitoring module to obtain the insulation resistance value of the battery pack, including: The battery management unit is connected to the positive and negative terminals of the battery. The positive terminal of the battery pack is connected to the first terminal of the temperature switch, and the negative terminal of the battery pack is connected in series with the sampling standard resistor. The second terminal of the sampling standard resistor is grounded. The battery management unit sends a voltage square wave signal, the temperature switch is closed, and the voltage square wave signal flows through the entire battery pack and the sampling standard resistor before being discharged to the ground. Using the applied voltage square wave signal, the conductivity current that moves in the direction of the electric field of the ions contained therein can be measured, thereby obtaining the insulation resistance value. The control module is used to determine the pre-thermal failure warning state of the energy storage system based on the insulation resistance value of the battery pack and the temperature parameter. The control module includes: The first comparison unit is used to compare the insulation resistance value of the battery pack with a preset resistance threshold and generate a first comparison result, including: subtracting or quotienting the insulation resistance value of the battery pack from the preset resistance threshold to obtain the first comparison result; The second comparison unit is used to compare the temperature parameters of the battery pack with a preset temperature threshold and generate a second comparison result, including: subtracting or quotienting the temperature parameters of the battery pack from the preset temperature threshold to obtain the second comparison result; A state determination unit is used to determine the pre-thermal failure state of the energy storage system based on the first comparison result and the second comparison result. The state determination unit is used to: determine the energy storage system as a first pre-thermal failure state when the insulation resistance value of a single battery pack is greater than a preset resistance threshold, or the temperature parameter of a single battery pack is greater than a preset temperature threshold; and determine the energy storage system as a second pre-thermal failure state when the insulation resistance value of at least two battery packs is greater than the preset resistance threshold and the temperature parameter of at least two battery packs is greater than the preset temperature threshold.

7. An energy storage system, characterized in that, include: At least one battery cluster, each battery cluster including at least one battery pack, and the energy storage system early warning monitoring device according to claim 6, the energy storage system early warning monitoring device being used to perform the energy storage system early warning monitoring method according to any one of claims 1 to 5.

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