High voltage control method and device for multi-level linkage protection

Abstract

The embodiment of the present application discloses a high-voltage control method and device with multi-level linkage protection, the method comprising: collecting energy storage system data, wherein the energy storage system data comprises PACK data, battery cluster data, and system dynamic environment data; analyzing the energy storage system data according to early warning analysis rules to determine whether there is a potential risk; triggering protection measures when a risk of a corresponding level of PACK, battery cluster or container is detected; the embodiment of the present application ensures the safety of the energy storage system in a hierarchical manner through multi-level linkage protection, reduces system safety, makes it easy to determine the failure rate, simplifies subsequent software upgrades, and reduces the risk of local policy failure.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage systems, and in particular to a high-voltage control method and device for multi-level linkage protection. Background Art

[0002] Energy storage system safety is one of the important factors that restrict the development of energy storage; the occurrence of energy storage safety accidents can be divided into two categories: Internal system: internal battery failure causes thermal runaway at the battery level, and strong chemical reactions cause local high temperatures, high heat and flammable gas accumulation, eventually causing fires or even explosions. External system: auxiliary system failures cause components to produce arcs, short circuits, etc., resulting in local combustion or smoke, and ultimately causing fire accidents. Specifically, it can be divided into battery cell, battery PACK, battery cluster, and system-level safety; battery cells can only be improved on a large scale if the system or process is replaced.

[0003] Currently, the most common energy storage protection is on-site protection, and the most common protection is at the container level. PACK isolation and cloud analysis / prediction are not possible. The common energy storage system protection is that the local controller controls according to its own logic, and cannot be isolated by level. Therefore, there are the following disadvantages: 1. Imperfect local logic will lead to failure of system safety protection; 2. When a single-level failure occurs, the entire energy storage system needs to be shut down, affecting customer benefits and product reputation, and increasing the supplier's maintenance costs; 3. Subsequent software upgrades are difficult, and it is difficult to determine the failure rate. Summary of the invention

[0004] The embodiments of the present application provide a high-voltage control method and device with multi-level linkage protection to solve the above-mentioned problems.

[0005] In a first aspect, an embodiment of the present application provides a high voltage control method for multi-level linkage protection, the method comprising the following steps:

[0006] Collecting energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic environment data;

[0007] Analyze the energy storage system data according to early warning analysis rules to determine whether there is a potential risk;

[0008] When a PACK-level risk is detected, an early warning will be issued. When the PACK risk reaches the first-level risk, the first-level protection measures will be taken:

[0009] When the battery cluster level 1 risk or PACK level 1 risk rises to level 2 risk, take level 2 protection measures;

[0010] When the container level 1 risk or battery cluster level 1 risk rises to level 2 risk, level 3 protection measures are taken;

[0011] When a PACK level 3 risk, battery cluster level 3 risk or container level 3 risk is detected, the fire linkage is triggered and the highest level of container-level protection measures are triggered.

[0012] Furthermore, the PACK data includes battery current, battery cell voltage, battery cell temperature, and gas concentration in the battery pack; the battery cluster data includes battery total current, total voltage SOC value, copper plate temperature, contactor temperature, and gas concentration in the battery cluster; the system dynamic environment data includes cabinet temperature, humidity, gas concentration and the status of each device.

[0013] Furthermore, analyzing the energy storage system data according to the early warning analysis rules to determine whether there is a potential risk includes:

[0014] PACK level: Through the change relationship between cell voltage and current under different working conditions, it can be judged whether the battery cell has potential risks of welding and micro short circuit; through the changes in cell temperature, cell voltage and gas concentration, it can be judged whether there is potential risk of thermal runaway; through the difference in cell temperature, the potential SOH change trend of each battery cell can be predicted;

[0015] Battery cluster level: Determine whether the high-voltage circuit has a false connection through the total current, contactor temperature, and copper plate temperature; analyze the changes in total voltage and total current to understand the resistance changes and optimal charge and discharge power of the battery cluster at different temperatures and powers; confirm the risk of thermal runaway of the battery cluster through battery cluster-level temperature and gas concentration;

[0016] Container level: The risk of thermal runaway at the container level is determined by the temperature and gas concentration inside the cabinet. The historical fault data of each device in the container and its operating data are confirmed by the status of each device to determine whether the circuit has the risk of micro-short circuit arcing.

[0017] Furthermore, when it is detected that the PACK risk reaches the first-level risk, the first-level protection measures are taken, including:

[0018] When it is detected that the PACK risk reaches level one, local PACK-level isolation measures are sent to the local area through the cloud platform, the local PACK high voltage is powered off, and its internal PACK-level relay is disconnected.

[0019] Furthermore, when it is detected that the level 1 risk of the battery cluster or the level 1 risk of the PACK rises to the level 2 risk, the level 2 protection measures are taken, including:

[0020] When a battery cluster level 1 risk is detected or a PACK level 1 risk rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform. All local battery clusters and all PCS high voltages are powered off, and their internal high voltage box contactors are disconnected. The PCS is shut down and the DC side / AC test circuit breakers are disconnected in conjunction.

[0021] Furthermore, when it is detected that the container level 1 risk or the battery cluster level 1 risk rises to level 2 risk, a level 3 protection measure is taken, including:

[0022] When a container-level risk or a battery cluster-level risk rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform. All local battery clusters and all PCS high voltages are powered off, their internal high-voltage box contactors are disconnected, the PCS is shut down, and the DC side / AC test circuit breakers are disconnected.

[0023] Furthermore, when a PACK level 3 risk, a battery cluster level 3 risk or a container level 3 risk is detected, the fire linkage is triggered, and after the highest level of container-level protection measures are triggered, the following is further included:

[0024] When PACK level 2 risk, battery cluster level 2 risk or container level 2 risk is triggered, according to the fault cause classification, if the corresponding detection parameters have not changed or the risk level continues to increase, the corresponding fire protection measures are triggered, and the container-level protection is triggered.

[0025] In a second aspect, an embodiment of the present application further provides a high-voltage control device with multi-level linkage protection, comprising:

[0026] A data acquisition module, used to collect energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic ring data;

[0027] A risk analysis module, used to analyze the energy storage system data according to early warning analysis rules to determine whether there is a potential risk;

[0028] The first protection module is used to issue an early warning when a PACK-level risk is detected. When the PACK risk reaches the first-level risk, the first-level protection measures are taken:

[0029] The second protection module is used to take secondary protection measures when it is detected that the primary risk of the battery cluster or the primary risk of the PACK rises to the secondary risk;

[0030] The third protection module is used to take third-level protection measures when it is detected that the first-level risk of the container or the first-level risk of the battery cluster rises to the second-level risk;

[0031] The fourth protection module is used to trigger fire linkage and the highest level of container-level protection measures when a PACK level 3 risk, a battery cluster level 3 risk or a container level 3 risk is detected.

[0032] In a third aspect, an embodiment of the present application further provides a computer device, including: a memory and one or more processors;

[0033] The memory is used to store one or more programs;

[0034] When the one or more programs are executed by the one or more processors, the one or more processors implement a high-voltage control method for multi-level linkage protection as described above.

[0035] In a fourth aspect, an embodiment of the present application further provides a storage medium comprising computer executable instructions, wherein the computer executable instructions, when executed by a computer processor, are used to execute a high-voltage control method for multi-level linkage protection as described above.

[0036] The embodiment of the present application collects energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic environment data; the energy storage system data is analyzed according to early warning analysis rules to determine whether there is a potential risk; when a PACK-level risk is detected, an early warning is issued, and when it is detected that the PACK risk reaches a first-level risk, a first-level protection measure is taken; when a first-level risk of a battery cluster is detected or a first-level risk of PACK rises to a second-level risk, a second-level protection measure is taken; when a first-level risk of a container is detected or a first-level risk of a battery cluster rises to a second-level risk, a third-level protection measure is taken; when a third-level risk of PACK, a third-level risk of a battery cluster, or a third-level risk of a container is detected, a fire linkage is triggered, and the highest level of container-level protection measures are triggered; through multi-level linkage protection, the safety of the energy storage system is ensured in a hierarchical manner, the system safety is reduced, the failure rate is easily determined, the subsequent software upgrade is simple, and the risk of local policy failure is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flow chart of a high-voltage control method for multi-level linkage protection provided in an embodiment of the present application;

[0038] Figure 2 It is a diagram of a single PACK isolation device of a high-voltage control method of multi-stage linkage protection provided in an embodiment of the present application;

[0039] Figure 3 It is a structural diagram of a high-voltage control device with multi-stage linkage protection provided in an embodiment of the present application;

[0040] Figure 4 It is a structural diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

[0042] The high-voltage control method of the multi-level linkage protection provided in the embodiment can be executed by a high-voltage control device of the multi-level linkage protection, which can be implemented by software and / or hardware and integrated in a high-voltage control device of the multi-level linkage protection. The high-voltage control device of the multi-level linkage protection can be a computer or other equipment.

[0043] Figure 1 A flowchart of a high voltage control method for multi-level linkage protection provided in an embodiment of the present application. Figure 1 , the method comprises the following steps:

[0044] Step 110: Collect energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic environment data.

[0045] Specifically, the PACK data includes battery current, battery cell voltage, battery cell temperature, and gas concentration in the battery pack; the battery cluster data includes battery total current, total voltage SOC value, copper plate temperature, contactor temperature, and gas concentration in the battery cluster; the system dynamic environment data includes cabinet temperature, humidity, gas concentration and the status of each device.

[0046] Step 120: Analyze the energy storage system data according to early warning analysis rules to determine whether there is a potential risk.

[0047] Specifically, at the PACK level: the change relationship between the cell voltage and current under different working conditions can be used to determine whether the cell has potential risks of welding and micro-short circuits; the change in cell temperature, cell voltage, and gas concentration can be used to determine whether there is a potential risk of thermal runaway; the difference in cell temperature can be used to predict the potential SOH change trend of each cell;

[0048] Battery cluster level: Determine whether the high-voltage circuit has a false connection through the total current, contactor temperature, and copper plate temperature; analyze the changes in total voltage and total current to understand the resistance changes and optimal charge and discharge power of the battery cluster at different temperatures and powers; confirm the risk of thermal runaway of the battery cluster through battery cluster-level temperature and gas concentration;

[0049] Container level: The thermal runaway risk at the container level is determined by the temperature and gas concentration inside the cabinet. The historical fault data of each device in the container and its operating data (including operating temperature, voltage, current, pressure, etc.) are confirmed by the status of each device to determine whether the circuit has the risk of micro-short circuit arcing.

[0050] Step 130: When a PACK-level risk is detected, an early warning is issued; when the PACK risk is detected to reach a first-level risk, a first-level protection measure is taken.

[0051] Specifically, when it is detected that the PACK risk reaches level one, on-site PACK-level isolation measures are sent to the local area through the cloud platform, the local PACK high voltage is powered off, and its internal PACK-level relay is disconnected.

[0052] For example, when the average voltage of any battery cell is less than a certain warning threshold during multiple charge and discharge cycles, the warning is activated. When any battery cell has an abnormal operating condition (such as sudden temperature change or voltage change) during a single cycle, the warning is activated; when any temperature point is higher than the set temperature threshold during multiple charge and discharge cycles, the warning is activated; if there are battery cell points with higher voltage or lower voltage during charging, the warning is activated; if the gas concentration is greater than the first warning threshold, the warning is activated.

[0053] For example, when it is detected that the PACK risk reaches the first level, the cloud platform initiates the single PACK isolation mode: the battery cluster is powered off as a whole to make the PACK isolation safe; please refer to Figure 2 The PACK has a built-in electric single-pole bidirectional switch. When the PACK is in normal operation, the electric switch is turned to the positive pole of the PACK, and the PACK is connected to the high-voltage circuit. When the PACK is abnormal and needs to be isolated, the electric switch is turned to the negative pole of the PACK, and the single PACK is not connected to the high-voltage circuit; if the PACK is equipped with a PACK-level relay, it will be disconnected synchronously; after the isolation is completed, the battery cluster is powered on again and operates normally.

[0054] Step 140: When it is detected that the level 1 risk of the battery cluster or the level 1 risk of the PACK rises to the level 2 risk, a level 2 protection measure is taken.

[0055] Specifically, when a level 1 risk of a battery cluster is detected or a level 1 risk of a PACK rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform, and the high voltage of all local battery clusters and all PCS (battery management systems) is powered off, and their internal high-voltage box contactors are disconnected, the PCS is shut down, and the DC side / AC side circuit breakers are disconnected in conjunction.

[0056] Exemplarily, when a battery cluster level 1 risk or a PACK level 1 risk rises to a level 2 risk, the entire battery cluster is isolated;

[0057] Exemplarily, the battery cluster risk detection is any of the following: when the charge and discharge current exceeds the first limit threshold in multiple cycles; when the internal resistance of the battery cluster is abnormal in the single cell cycle test through voltage and current calculation; when the high-voltage contactor temperature rises abnormally; when the copper plate temperature rises abnormally; if the gas concentration is greater than the first warning circle value;

[0058] Exemplarily, the overall power-off logic of the battery cluster includes:

[0059] The EMS (energy management system) sends a shutdown command to a single PCS (energy storage converter), and then sends a power-off command to the corresponding BMS after the single PCS is shut down, and at the same time controls the auxiliary devices of the single battery cluster to stop running. Preferably, the EMS can put all controllers of the energy storage system into a dormant state through a sleep request.

[0060] Step 150: When it is detected that the container level 1 risk or the battery cluster level 1 risk rises to level 2 risk, take level 3 protection measures.

[0061] Specifically, when a container level 1 risk is detected or a battery cluster level 1 risk rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform, all local battery clusters and all PCS high voltages are powered off, their internal high voltage box contactors are disconnected, the PCS is shut down, and the DC side / AC test circuit breakers are disconnected in conjunction.

[0062] For example, when the container level 1 risk or the battery cluster level 1 risk rises to level 2 risk, the entire container is isolated. Container risk detection is as follows: 1. When the temperature inside the container exceeds the first temperature threshold; 2. When the overall gas concentration of the container is greater than the first concentration threshold; 3. When there is an abnormality in the equipment status.

[0063] The overall power-off logic of the container includes: all PCSs of the EMS send a shutdown command, and after a single PCS is shut down, a power-off command is sent to the corresponding BMS, and at the same time, the auxiliary devices of the entire system are controlled to stop running. Preferably, the EMS can put all controllers of the energy storage system into a sleep state through a sleep request.

[0064] Step 160: When a PACK level 3 risk, a battery cluster level 3 risk or a container level 3 risk is detected, a fire linkage is triggered, and the highest level container-level protection measures are triggered.

[0065] Optionally, when a PACK secondary risk, battery cluster secondary risk or container secondary risk is triggered, based on the fault cause classification, if the corresponding detection parameters have not changed or the risk level continues to increase, the corresponding fire protection measures are triggered, and the container-level protection is triggered.

[0066] One or two of the three-level protections of PACK, battery cluster and container can be selected for disassembly and reorganization; PACK-level isolation can ensure the lowest maintenance cost. It is preferred to start the fire linkage and liquid cooling linkage at the same time when a high-level fault is triggered; while ensuring the safety of AC measurement, liquid cooling can be turned on to cool the DC side current, which can stabilize the faulty PACK to a certain extent. When a high-level fault protection is triggered, triggering the fire protection can prevent the fire from spreading.

[0067] Based on the above embodiments, the present application also provides a high-voltage control device with multi-level linkage protection. Figure 3 The multi-level linkage protection high-voltage control device specifically includes: a data acquisition module 201, a risk analysis module 202, a first protection module 203, a second protection module 204, a third protection module 205 and a fourth protection module 206.

[0068] Among them, the data acquisition module 201 is used to collect energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic environment data; the risk analysis module 202 is used to analyze the energy storage system data according to the early warning analysis rules to determine whether there is a potential risk; the first protection module 203 is used to give an early warning when a PACK-level risk is detected, and to take a first-level protection measure when the PACK risk is detected to reach a first-level risk: the second protection module 204 is used to take a second-level protection measure when a first-level risk of a battery cluster is detected or a first-level risk of PACK rises to a second-level risk; the third protection module 205 is used to take a third-level protection measure when a first-level risk of a container is detected or a first-level risk of a battery cluster rises to a second-level risk; the fourth protection module 206 is used to trigger a fire linkage when a third-level risk of PACK, a third-level risk of a battery cluster, or a third-level risk of a container is detected, and trigger the highest level of container-level protection measures.

[0069] Furthermore, the high-voltage control device with multi-level linkage protection also includes: a cloud server, including a data processing unit, which performs data analysis and cleaning according to the energy storage system data, and a logic judgment unit: the data of each level of the comprehensive energy storage system can realize self-diagnosis. At the same time, the cloud big data platform can optimize and upgrade the fault warning / diagnosis algorithm in the future; an energy management system EMS, including a data upload function and a scheduling module; scheduling subordinate actuator tasks according to the cloud server control method; an inverter, which realizes charge and discharge data collection and charge and discharge power / on and off execution; a BCMU battery cluster collection unit, which realizes battery cluster data collection and corresponding control protection logic execution; a BMU battery PACK collection unit, which realizes the collection of PACK level data and corresponding control protection logic execution.

[0070] As described above, the embodiment of the present application collects energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic ring data; the energy storage system data is analyzed according to the early warning analysis rules to determine whether there is a potential risk; when a PACK-level risk is detected, an early warning is issued, and when it is detected that the PACK risk reaches a first-level risk, a first-level protection measure is taken: when a first-level risk of a battery cluster is detected or a first-level risk of PACK rises to a second-level risk, a second-level protection measure is taken; when a first-level risk of a container is detected or a first-level risk of a battery cluster rises to a second-level risk, a third-level protection measure is taken; when a third-level risk of PACK, a third-level risk of a battery cluster, or a third-level risk of a container is detected, a fire linkage is triggered, and the highest level of container-level protection measures are triggered; through multi-level linkage protection, the safety of the energy storage system is ensured in a hierarchical manner, the system safety is reduced, the failure rate is easily determined, the subsequent software upgrade is simple, and the risk of local policy failure is reduced.

[0071] The high-voltage control device for multi-stage linkage protection provided in the embodiment of the present application can be used to execute the high-voltage control method for multi-stage linkage protection provided in the above-mentioned embodiment, and has corresponding functions and beneficial effects.

[0072] The embodiment of the present application also provides a computer device, which can integrate the high-voltage control device with multi-level linkage protection provided by the embodiment of the present application. Figure 4 Schematic diagram of a computer device provided in an embodiment of the present application. Figure 4 The computer device includes: an input device 43, an output device 44, a memory 42 and one or more processors 41; the memory 42 is used to store one or more programs; when the one or more programs are executed by the one or more processors 41, the one or more processors 41 implement the high-voltage control method of multi-level linkage protection provided in the above embodiment. The input device 43, the output device 44, the memory 42 and the processor 41 can be connected by a bus or other means. Figure 4The example of connecting through bus is taken in the following.

[0073] The processor 41 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 42, that is, realizes the high-voltage control method of the above-mentioned multi-level linkage protection.

[0074] The computer device provided above can be used to execute the high-voltage control method of multi-level linkage protection provided in the above embodiment, and has corresponding functions and beneficial effects.

[0075] The embodiment of the present application also provides a storage medium containing computer executable instructions, which are used to execute a high-voltage control method for multi-level linkage protection when executed by a computer processor. The high-voltage control of the multi-level linkage protection includes: collecting energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic ring data; analyzing the energy storage system data according to early warning analysis rules to determine whether there is a potential risk; issuing an early warning when a PACK-level risk is detected, and taking a first-level protection measure when it is detected that the PACK risk reaches a first-level risk; taking a second-level protection measure when a first-level battery cluster risk is detected or a first-level PACK risk rises to a second-level risk; taking a third-level protection measure when a first-level container risk is detected or a first-level battery cluster risk rises to a second-level risk; triggering a fire linkage when a third-level PACK risk, a third-level battery cluster risk, or a third-level container risk is detected. The highest level of container-level protection measures are triggered.

[0076] Storage medium - any of various types of memory devices or storage devices. The term "storage medium" is intended to include: installation media, such as CD-ROM, floppy disk or tape devices; computer device memory or random access memory, such as DRAM, DDRRAM, SRAM, EDORAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (such as hard disk or optical storage); registers or other similar types of memory elements, etc. The storage medium may also include other types of memory or combinations thereof. In addition, the storage medium may be located in a first computer device in which the program is executed, or may be located in a different second computer device, which is connected to the first computer device via a network (such as the Internet). The second computer device can provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media that may reside in different locations (for example, in different computer devices connected via a network). The storage medium may store program instructions (for example, embodied as a computer program) that can be executed by one or more processors.

[0077] Of course, the storage medium containing computer executable instructions provided in the embodiment of the present application, whose computer executable instructions are not limited to the high-voltage control method of multi-level linkage protection as described above, can also execute related operations in the high-voltage control method of multi-level linkage protection provided in any embodiment of the present application.

[0078] The high-voltage control device, storage medium and computer equipment for multi-level linkage protection provided in the above embodiments can execute the high-voltage control method for multi-level linkage protection provided in any embodiment of the present application. For technical details not described in detail in the above embodiments, please refer to the high-voltage control method for multi-level linkage protection provided in any embodiment of the present application.

[0079] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A high voltage control method with multi-level linkage protection, characterized in that: The method comprises the following steps: Collecting energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic environment data; Analyze the energy storage system data according to early warning analysis rules to determine whether there is a potential risk; When a PACK-level risk is detected, an early warning will be issued. When the PACK risk reaches the first-level risk, the first-level protection measures will be taken: When the battery cluster level 1 risk or PACK level 1 risk rises to level 2 risk, take level 2 protection measures; When the container level 1 risk or battery cluster level 1 risk rises to level 2 risk, level 3 protection measures are taken; When a PACK level 3 risk, battery cluster level 3 risk or container level 3 risk is detected, the fire linkage is triggered and the highest level of container-level protection measures are triggered; Analyzing the energy storage system data according to the early warning analysis rules to determine whether there is a potential risk includes: PACK level: Through the change relationship between cell voltage and current under different working conditions, it can be judged whether the battery cell has the potential risk of cold soldering and micro short circuit; through the changes in cell temperature, cell voltage, and gas concentration, it can be judged whether there is a potential risk of thermal runaway; through the difference in cell temperature, the potential SOH change trend of each battery cell can be predicted; Battery cluster level: Determine whether the high-voltage circuit has a false connection through the total current, contactor temperature, and copper plate temperature; analyze the changes in total voltage and total current to understand the resistance changes and optimal charge and discharge power of the battery cluster at different temperatures and powers; confirm the risk of thermal runaway of the battery cluster through battery cluster-level temperature and gas concentration; Container level: The risk of thermal runaway at the container level is determined by the temperature and gas concentration inside the cabinet. The historical fault data of each device in the container and its operating data are confirmed by the status of each device to determine whether the circuit has the risk of micro-short circuit arcing.

2. The high voltage control method of multi-level linkage protection according to claim 1, characterized in that: The PACK data includes battery current, battery cell voltage, battery cell temperature, and gas concentration in the battery pack; the battery cluster data includes total battery current, total voltage SOC value, copper plate temperature, contactor temperature, and gas concentration in the battery cluster; the system dynamic environment data includes cabinet temperature, humidity, gas concentration and the status of each device.

3. The high voltage control method of multi-level linkage protection according to claim 1, characterized in that: When the PACK risk is detected to reach the first level, the first level protection measures are taken, including: When it is detected that the PACK risk reaches level one, local PACK-level isolation measures are sent to the local area through the cloud platform, the local PACK high voltage is powered off, and its internal PACK-level relay is disconnected.

4. The high voltage control method of multi-level linkage protection according to claim 1, characterized in that: When the battery cluster level 1 risk or the PACK level 1 risk is detected to rise to level 2 risk, level 2 protection measures are taken, including: When a battery cluster level 1 risk is detected or a PACK level 1 risk rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform. All local battery clusters and all PCS high voltages are powered off, and their internal high voltage box contactors are disconnected. The PCS is shut down and the DC side / AC test circuit breakers are disconnected in conjunction.

5. The high voltage control method of multi-stage linkage protection according to claim 1, characterized in that: When the container level 1 risk or battery cluster level 1 risk rises to level 2 risk, three-level protection measures are taken, including: When a container-level risk or a battery cluster-level risk rises to a level 2 risk, on-site container-level isolation measures are sent to the local area through the cloud platform. All local battery clusters and all PCS high voltages are powered off, their internal high-voltage box contactors are disconnected, the PCS is shut down, and the DC side / AC test circuit breakers are disconnected.

6. The high voltage control method of multi-level linkage protection according to claim 1, characterized in that: When a PACK level 3 risk, a battery cluster level 3 risk or a container level 3 risk is detected, the fire linkage is triggered, and after the highest level of container-level protection measures are triggered, the following is also included: When PACK level 2 risk, battery cluster level 2 risk or container level 2 risk is triggered, according to the fault cause classification, if the corresponding detection parameters have not changed or the risk level continues to increase, the corresponding fire protection measures are triggered, and the container-level protection is triggered.

7. A high-voltage control device with multi-level linkage protection, characterized in that: include: A data acquisition module, used to collect energy storage system data, wherein the energy storage system data includes PACK data, battery cluster data, and system dynamic ring data; A risk analysis module, used to analyze the energy storage system data according to early warning analysis rules to determine whether there is a potential risk; The first protection module is used to issue an early warning when a PACK-level risk is detected. When the PACK risk reaches the first-level risk, the first-level protection measures are taken: The second protection module is used to take secondary protection measures when it is detected that the primary risk of the battery cluster or the primary risk of the PACK rises to the secondary risk; The third protection module is used to take third-level protection measures when it is detected that the first-level risk of the container or the first-level risk of the battery cluster rises to the second-level risk; The fourth protection module is used to trigger fire linkage and the highest level of container-level protection measures when a PACK level 3 risk, a battery cluster level 3 risk or a container level 3 risk is detected; Analyzing the energy storage system data according to the early warning analysis rules to determine whether there is a potential risk includes: PACK level: Through the change relationship between cell voltage and current under different working conditions, it can be judged whether the battery cell has the potential risk of cold soldering and micro short circuit; through the changes in cell temperature, cell voltage, and gas concentration, it can be judged whether there is a potential risk of thermal runaway; through the difference in cell temperature, the potential SOH change trend of each battery cell can be predicted; Battery cluster level: Determine whether the high-voltage circuit has a false connection through the total current, contactor temperature, and copper plate temperature; analyze the changes in total voltage and total current to understand the resistance changes and optimal charge and discharge power of the battery cluster at different temperatures and powers; confirm the risk of thermal runaway of the battery cluster through battery cluster-level temperature and gas concentration; Container level: The risk of thermal runaway at the container level is determined by the temperature and gas concentration inside the cabinet. The historical fault data of each device in the container and its operating data are confirmed by the status of each device to determine whether the circuit has the risk of micro-short circuit arcing.

8. A computer device, characterized in that: include: memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement a high-voltage control method for multi-level linkage protection as described in any one of claims 1-6.

9. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute a high-voltage control method for multi-level linkage protection as described in any one of claims 1-6 when executed by a computer processor.

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