CN211701468U - Protection device suitable for energy storage system - Google Patents
Protection device suitable for energy storage system Download PDFInfo
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- CN211701468U CN211701468U CN201922488428.6U CN201922488428U CN211701468U CN 211701468 U CN211701468 U CN 211701468U CN 201922488428 U CN201922488428 U CN 201922488428U CN 211701468 U CN211701468 U CN 211701468U
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Abstract
The utility model discloses a protection device suitable for an energy storage system, which monitors the insulation degree and the leakage current of the energy storage system; when the insulation degree and the leakage current of the energy storage system are not within the preset threshold range, the protection device disconnects the grounding connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system, and cuts off a discharging branch path between the energy storage system and the cabinet body or the box body or the battery rack. The device effectively guarantees the correctness of electrical connection and insulation between the distributed energy storage system or the storage battery system and the system cabinet body or the box body or the battery rack, monitors a fault abnormal discharge branch path, and cuts off a loop. The short circuit, arc discharge and even combustion caused by insufficient insulation between the distributed energy storage system or the storage battery system and the cabinet body or the box body or the battery frame when local faults or liquid leakage occurs are avoided, and the protection device has the protection accuracy, flexibility and usability.
Description
Technical Field
The utility model relates to an energy storage system's monitoring and protection technical field, in particular to protection device suitable for energy storage system.
Background
In the prior art, an energy storage system, i.e., a distributed energy storage system or a storage battery system, is a complete system formed by connecting one or more storage batteries in series and parallel. After the system connection is completed, the single storage batteries can be fixed and placed through the cabinet body or the box body or the battery rack. After the single storage batteries are fixed and placed, external electrical connection is eliminated, and the external output terminals of the single storage batteries, the interiors of the storage batteries (including but not limited to the positive and negative electrodes of the storage batteries, external output intelligent interfaces and the like) and the shells are electrically insulated from the cabinet body or the box body or the battery rack. However, when a certain battery in the distributed energy storage system or the battery system has a fault, especially when a certain single battery in the distributed energy storage system or the battery system has a leakage fault, the internal or external output terminal of the faulty battery is electrically connected with the cabinet body or the box body or the battery rack through the leakage. When the electrical connection is established, the failed storage battery itself or all or part of the storage batteries connected in series with the failed storage battery can form an abnormal loop with the cabinet body or the box body or the battery rack. The abnormal loop provides a discharging loop between the distributed energy storage system or the storage battery system and the cabinet body or the box body or the battery rack. The existence of the abnormal loop can perform branch discharge on part or all of the storage batteries in the distributed energy storage system or the storage battery system, so that the distributed energy storage system or the storage battery system is damaged. In extreme cases, when the distributed energy storage system or the storage battery system continuously branches or arcing is caused in the discharging process, overheating, even explosion and combustion of the distributed energy storage system or the storage battery system can be caused.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a protection device suitable for an energy storage system to solve the problems of the conventional technology. Specifically, this disclosure realizes finding the detection of distributed energy storage system or battery system electric leakage and weeping trouble very first time through real time monitoring distributed energy storage system or the cabinet body of battery system or box or the electric leakage current between the battery frame to ground. In addition, according to the actual use condition, at the first time when a fault is found, the grounding of the cabinet body or the box body or the battery rack of the distributed energy storage system or the battery system is disconnected through the optional protection device, and the connection between a loop or a standby energy storage device which is formed by leakage or leakage of the distributed energy storage system or the battery system and passes through the cabinet body or the box body or the battery rack of the system and the system ground is cut off, so that the function of protecting the distributed energy storage system or the battery system is achieved. Further, when the system finds that the distributed energy storage system or the storage battery system has an electric leakage condition or a liquid leakage condition, the potential between the cabinet body or the box body or the battery rack of the distributed energy storage system or the storage battery system and the protection ground can be measured through a monitoring circuit arranged in the system, and the basic location of a fault point is judged.
In a first aspect, an embodiment of the present invention provides a protection device suitable for an energy storage system, the device includes: the monitoring module is used for monitoring the insulation degree and the leakage current of the energy storage system in real time; and the protection module is used for disconnecting the grounding connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system through the protection device when the detected insulation degree of the energy storage system and the detected leakage current are not within the preset threshold range, and cutting off a discharge branch path between the energy storage system and the cabinet body or the box body or the battery rack to realize the protection of the energy storage system and the power supply system.
In one embodiment, the protection module comprises: the first detection and judgment unit is used for detecting and judging whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range.
In one embodiment, the protection module comprises: the first execution unit is used for detecting and judging that the insulation degree and the leakage current of the energy storage system are not within a preset threshold range, and cutting off a discharging branch path formed by the energy storage system, the cabinet body or the box body or the battery rack so as to protect the energy storage system and the power supply system.
In one embodiment, the protection module comprises: and the second detection and judgment unit is used for detecting and judging whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range.
In one embodiment, the protection module comprises: and the first measuring unit is used for detecting and judging that the insulation degree and the leakage current of the energy storage system are within a preset threshold range, and measuring the potential between the energy storage system and the cabinet body or the box body or the battery rack through a monitoring circuit built in the energy storage system.
In one embodiment, the monitoring module includes a monitoring unit for monitoring the current at the cabinet or the box of the energy storage system or the battery rack ground in real time through at least one leakage current sensor.
In one embodiment, the at least one leakage current sensor is a 30mA-1000mA current sensor.
In one embodiment, the current sensor correspondingly outputs the measured leakage current value in an analog quantity output mode; or the current sensor correspondingly outputs the measured leakage current value in a digital output mode, wherein the judgment condition of the digital output mode is whether the monitored current value exceeds a preset current threshold range.
In one embodiment, the monitoring module comprises a definition unit for defining the leakage current as an overrun when the detected leakage current exceeds a current range of 30mA-1000 mA.
In one embodiment, the protection module comprises: the second measuring unit is used for measuring the voltage difference of the cabinet body or the box body or the battery rack of the energy storage system when the energy storage system has electric leakage or liquid leakage; and the position judgment unit is used for judging the specific position of electric leakage or liquid leakage of the energy storage system according to the measured voltage difference and the acquired voltage data measured by the single battery.
The utility model provides a protection device suitable for an energy storage system, which monitors the insulation degree and the leakage current of the energy storage system in real time; when the detected insulation degree and the detected leakage current of the energy storage system are not within the preset threshold range, the protection device disconnects the grounding connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system, and cuts off a discharging branch circuit between the energy storage system and the cabinet body or the box body or the battery rack to realize the protection of the energy storage system and the power supply system. The device can effectively guarantee the correctness of electrical connection and insulation between the distributed energy storage system or the storage battery system and the system cabinet body or the box body or the battery rack, timely monitor a leakage loop existing between the system cabinet body or the box body or the battery rack due to the insufficient insulation of the distributed energy storage system or the storage battery system or the problems of shell breakage, liquid leakage and the like, and timely cut off the loop. The occurrence of severe faults such as short circuit and even combustion caused by insufficient insulation between the distributed energy storage system or the storage battery system and the cabinet body or the box body or the battery rack when local faults or liquid leakage occurs is avoided, and the protection precision, flexibility and usability are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a protection device suitable for an energy storage system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection device suitable for an energy storage system according to another embodiment of the present invention; and
fig. 3 is a schematic circuit diagram of a protection method for an energy storage system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following detailed description of the embodiments of the protection device for an energy storage system according to the present invention is described with reference to the accompanying drawings. It should be noted that the energy storage systems referred to and protected by the present disclosure are specifically electrical energy storage systems. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Distributed energy storage systems or battery systems are usually formed by one or more batteries connected in series and parallel. The leakage of the storage battery is mostly caused by the damage of the storage battery shell caused by manufacturing defects, mechanical collision, improper transportation or use of the storage battery. The accumulator with leakage can form local conductor at the leakage part to destroy the original insulation of the accumulator. The cabinet body or the box body or the battery rack for installing and fixing the distributed energy storage system or the storage battery system is required to be protectively grounded according to the use condition under the common condition, and the position of the protective grounding is different according to different power supply systems and different application sites. And a certain potential difference exists between the total positive or total negative electrode output by the cabinet body or the box body or the battery rack connected with the protective ground and the distributed energy storage system or the storage battery system in series and each storage battery connected in series in the distributed energy storage system or the storage battery system. The magnitude of this potential difference is related to the system's ground condition, the total system voltage, and the location of each battery in the series battery pack. Under normal conditions, the distributed energy storage system or the storage battery system has higher insulation requirements on the storage battery and the cabinet body or the box body or the battery rack inside. However, due to the leakage of the batteries caused by the damage of the battery unit casing, manufacturing defects, mechanical impact, improper use and the like, an abnormal current path exists between a certain battery in the series-connected battery packs and a cabinet body or a box body or a battery rack on which the battery packs are mounted and fixed. The existence of the current path may cause the distributed energy storage system or the storage battery system to have a branch discharging loop outside the normal discharging loop. When the leakage of the storage battery reaches a certain amount, the discharging loop can cause the internal part of the distributed energy storage system or the storage battery system to perform branch discharging on the cabinet body or the box body or the battery rack once formed, and finally the distributed energy storage system or the storage battery system can be damaged, and the distributed energy storage system or the storage battery system can be burnt under severe conditions.
Specifically, in CN107870590A "computer room battery management device", a method of monitoring leakage of batteries by installing a battery leakage sensor in each battery and informing a management system is proposed. The leakage sensor part is not described in detail in this patent, and there is a lack of description of a specific embodiment of leakage monitoring. Further, the traditional mode, the mode of carrying out the weeping monitoring to the battery mainly relies on balanced bridge test mode, as patent application number: 201621017695 "a power battery insulation detection circuit based on small signal injection method" and patent application No.: 2017111123136 "a battery leakage detection device". The method has certain limitation on the composition and the use condition of the storage battery pack, and has high requirement on the precision of the balance resistance. The selected value of the balancing resistance is also related to the overall output voltage of the distributed energy storage system or battery system. In addition, the technology is easily affected by the performance imbalance of each single storage battery in the storage battery pack to generate false alarm. Patent application No.: 2016211734554A device for detecting battery leakage depends on the detection mode of volatile gas in battery to measure the leakage state of battery. The scheme has poor applicability to a storage battery system which is similar to a lead-acid storage battery and generates gas under the charging condition, and in the specific implementation process, the condition setting of alarming is difficult to accurately set, and the problem of false alarming or no alarming under the fault condition is easily generated. In addition, the above patents are only limited to the way of monitoring and alarming leakage or leakage fault of the distributed energy storage system or the battery system, and do not mention how to protect the distributed energy storage system or the battery system when leakage or leakage is found. In summary, a method and a device for leakage protection of a distributed energy storage system or a storage battery system are a research topic with great significance.
Fig. 1 is a schematic structural diagram of a protection device suitable for an energy storage system in an embodiment. Specifically, the device comprises: the monitoring module 100 is used for monitoring the insulation degree and the leakage current of the energy storage system in real time; the protection module 200 is configured to disconnect the ground connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system through the protection device when the detected insulation degree of the energy storage system and the detected leakage current are not within the preset threshold range, and cut off a discharge branch between the energy storage system and the cabinet body or the box body or the battery rack to realize protection of the energy storage system and the power supply system.
As shown in fig. 2, it should be noted that, in one embodiment, the monitoring module 100 includes a monitoring unit 110 for monitoring the current at the cabinet or box or battery rack ground of the energy storage system in real time through at least one leakage current sensor. Wherein, at least one leakage current sensor is a current sensor of 30mA-1000 mA. The current sensor correspondingly outputs the measured leakage current value in an analog quantity output mode; or the current sensor correspondingly outputs the measured leakage current value in a digital output mode, wherein the judgment condition of the digital output mode is whether the monitored current value exceeds a preset current threshold range.
Furthermore, as shown in fig. 2, in one embodiment, the monitoring module 100 includes a defining unit 120 for defining the leakage current as an overrun when the detected leakage current exceeds the current range of 30mA-1000 mA.
Furthermore, it should be noted that, as shown in fig. 2, in one embodiment, the protection device protection module 200 suitable for an energy storage system according to the present disclosure includes: a first detecting and determining unit 210, configured to detect and determine whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range; and a first execution unit 220, configured to detect and determine that the insulation degree and the leakage current of the energy storage system are not within a preset threshold range, and then cut off a discharge branch path formed by the energy storage system, the cabinet or the box, or the battery rack, so as to protect the energy storage system and the power supply system. Therefore, the distributed energy storage system or the storage battery system can be protected timely and efficiently.
Further, as shown in fig. 2, in an embodiment, the protection device protection module 200 for an energy storage system according to the present disclosure includes a second detecting and determining unit 230, configured to detect and determine whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range; and a first measuring unit 240, configured to detect and determine that the insulation degree and the leakage current of the energy storage system are within a preset threshold range, and measure a potential between the energy storage system and the cabinet or the box or the battery rack through a monitoring circuit built in the energy storage system.
Therefore, the effect of protecting the distributed energy storage system or the storage battery system can be more accurately finished.
Furthermore, as shown in fig. 2, it should be noted that the protection module 200 of the protection device for an energy storage system according to the present disclosure includes a second measurement unit 250, configured to measure a voltage difference between the cabinet or the box or the battery rack of the energy storage system when the energy storage system has an electric leakage or liquid leakage phenomenon; and a position determination unit 260, configured to determine a specific position of leakage or leakage of the energy storage system according to the measured voltage difference and the acquired voltage data measured by the single battery. Therefore, the purpose of protecting the distributed energy storage system or the storage battery system is precisely improved.
For a better understanding and application of the protection device for an energy storage system proposed by the present disclosure, details are provided in connection with fig. 3. It is to be understood that the scope of the disclosure is not limited to the following detailed description and examples.
The system comprises a monitoring module, a monitoring module and a monitoring module, wherein the monitoring module is used for monitoring the insulation degree and leakage current of a distributed energy storage system or a storage battery system in real time, particularly the insulation degree and leakage current between the storage battery system connected in series in the system and a cabinet body or a box body or a battery rack; the protective device is used for protecting a distributed energy storage system or a storage battery system, particularly when faults such as electric leakage, liquid leakage and the like exist between a storage battery system and a cabinet body or a box body or a battery rack which are connected in series in the system; the fault location method is used for fault location of the distributed energy storage system or the storage battery system, particularly when faults such as electric leakage and liquid leakage exist between the storage battery system connected in series in the system and the cabinet body or the box body or the battery rack.
Specifically, the leakage current and leakage monitoring device is characterized in that a leakage current sensor I2 is added to a cabinet body or a box body or a battery rack ground of a distributed energy storage system or a storage battery system to continuously monitor the current of the cabinet body or the box body or the battery rack to the ground. The current sensor can be selected from a range of 30mA to 1000mA according to the grade of leakage or leakage condition and different use requirements. When leakage or weepage occurs in the system, a certain amount of current flows in I2. The I2 current sensor can select a digital output mode after exceeding a certain value or correspondingly output the measured leakage current value through an analog output mode. The leakage and leakage monitoring device continuously monitors the output of the leakage current sensor I2, judges whether leakage or leakage exists in the system according to the output state of I2 and can judge the leakage or leakage degree through the output of I2. When I2 selects analog output, I2 outputs a current or voltage signal correlated to the current value of the cabinet or box or battery rack to ground. The leakage and leakage monitoring device can obtain the current flowing through I2, and when the current exceeds a certain amplitude, the leakage and leakage monitoring device triggers the subsequent measurement and protection actions. Or when I2 selects digital quantity output, when the current of the monitoring cabinet body or box body or battery rack to the ground exceeds the current threshold value set in I2, I2 outputs a digital quantity signal to trigger the subsequent measurement and protection actions of the leakage and leakage monitoring device. The protection action is related to the overall voltage of the storage battery and the use environment, and the design of all the protection actions is strictly designed according to the safety regulation of forced grounding of the system. Particularly, in a high-voltage system with high series voltage of the storage battery, when the protection action conflicts with safety regulations, the safety regulations shall be taken as the standard to ensure the grounding safety of the storage battery.
In addition, another mode is described, in which when the connection between the cabinet or box or battery rack of the battery system and the protective ground cannot be cut off according to the safety regulations, the connection between the battery system and the power supply system such as a charging power supply and a load connected thereto can be cut off. The cutting includes, but is not limited to, cutting off the positive cable and the negative cable between the battery system and the power system, simultaneously cutting off the positive cable and the negative cable, and cutting off the grounding point of the battery system. The device aims to cut off the abnormal discharging branch path of the energy storage system or the battery system with electric leakage or liquid leakage faults to the cabinet body or the box body or the battery rack. Selection and adaptation may be made in connection with field use situations.
When the leakage current of the cabinet body or the box body or the battery rack of the battery system is detected, the leakage and leakage monitoring device system can continuously monitor the voltage change between the battery rack and the protection ground. In actual operation, the voltage of the monitoring cabinet body or the box body or the battery rack and the total positive pole or the total negative pole of the battery pack can be selected according to the actual condition of grounding. When a certain battery in the battery pack leaks, the cabinet body or the box body or the battery rack forms a certain voltage difference to the total positive pole or the total negative pole of the battery pack. The voltage difference is measured and voltage data obtained by measuring each single battery is combined, and the system can roughly judge the position of the leakage battery. And when the leakage of the battery is confirmed to occur, the system outputs a start signal and outputs an alarm control signal. And simultaneously, the grounding switch connected in series with the cabinet body or the box body or the battery rack is cut off, so that the cabinet body or the box body or the battery rack is in a non-grounding state, or the connecting switch of the standby energy storage device and the power supply system is cut off, so that the storage battery system is in an isolated state, and a discharge loop of the leakage battery between the battery rack and the protection ground is cut off immediately.
In summary, the present disclosure provides a complete leakage and leakage protection device for a distributed energy storage system or a storage battery system, which includes a plurality of aspects of real-time monitoring, fault degree determination, fault location, and protection device for leakage and leakage states in the distributed energy storage system or the storage battery system. The traditional leakage current and leakage protection method is basically measured by a method of connecting balance resistors into a balance bridge or different positions in a storage battery pack, such as the total positive point, the total negative point and the grounding point of the storage battery pack in series. However, the distributed energy storage system or the storage battery system has uneven use state and inconsistent use. Particularly, when the voltage is unbalanced due to the monomer degradation and other phenomena occurring in the serial connection use process of the distributed energy storage system or the storage battery system, the validity of data obtained by adopting a balanced resistance or bridge method test is reduced, and the leakage state of the distributed energy storage system or the storage battery system cannot be accurately judged.
The leakage or leakage fault of the distributed energy storage system or the storage battery system can be accurately measured by measuring leakage current and potential difference between the system cabinet body or the box body or the battery rack generated under the leakage or leakage condition of the distributed energy storage system or the storage battery system. The method is not limited by a distributed energy storage system or a storage battery system, and has strong operability and practicability.
The utility model provides a protection device suitable for an energy storage system, which monitors the insulation degree and the leakage current of the energy storage system in real time; when the detected insulation degree and the detected leakage current of the energy storage system are not within the preset threshold range, the protection device disconnects the grounding connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system, and cuts off a discharging branch circuit between the energy storage system and the cabinet body or the box body or the battery rack to realize the protection of the energy storage system and the power supply system. The device can effectively guarantee the correctness of electrical connection and insulation between the distributed energy storage system or the storage battery system and the system cabinet body or the box body or the battery rack, timely monitor a leakage loop existing between the system cabinet body or the box body or the battery rack due to the insufficient insulation of the distributed energy storage system or the storage battery system or the problems of shell breakage, liquid leakage and the like, and timely cut off the loop. The occurrence of severe faults such as short circuit and even combustion caused by insufficient insulation between the distributed energy storage system or the storage battery system and the cabinet body or the box body or the battery rack when local faults or liquid leakage occurs is avoided, and the protection precision, flexibility and usability are achieved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
The foregoing describes the general principles of the present disclosure in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present disclosure are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present disclosure. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the disclosure is not intended to be limited to the specific details so described.
The block diagrams of devices, apparatuses, systems referred to in this disclosure are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
Also, as used herein, the use of "or" in a list of items beginning with "at least one" indicates a separate list, e.g., "A, B or at least one of C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the described example is preferred or better than other examples.
It is also noted that in the systems and methods of the present disclosure, components or steps may be decomposed and/or re-combined. These decompositions and/or recombinations are to be considered equivalents of the present disclosure.
Various changes, substitutions and alterations to the techniques described herein may be made without departing from the techniques of the teachings as defined by the appended claims. Moreover, the scope of the claims of the present disclosure is not limited to the particular aspects of the process, machine, manufacture, composition of matter, means, methods and acts described above. Processes, machines, manufacture, compositions of matter, means, methods, or acts, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or acts.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the disclosure to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A protection device adapted for use in an energy storage system, the device comprising:
the monitoring module is used for monitoring the insulation degree and the leakage current of the energy storage system in real time;
and the protection module is used for disconnecting the grounding connection between the energy storage system and the cabinet body or the box body or the battery rack or the connection between the standby energy storage device and the power supply system through the protection device when the detected insulation degree of the energy storage system and the detected leakage current are not within the preset threshold range, and cutting off a discharge branch path between the energy storage system and the cabinet body or the box body or the battery rack to realize the protection of the energy storage system and the power supply system.
2. The protection device for an energy storage system of claim 1, wherein said protection module comprises: the first detection and judgment unit is used for detecting and judging whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range.
3. The protection device for an energy storage system of claim 1, wherein said protection module comprises: the first execution unit is used for detecting and judging that the insulation degree and the leakage current of the energy storage system are not within a preset threshold range, and cutting off a discharging branch path formed by the energy storage system, the cabinet body or the box body or the battery rack so as to protect the energy storage system and the power supply system.
4. The protection device for an energy storage system of claim 1, wherein said protection module comprises: and the second detection and judgment unit is used for detecting and judging whether the insulation degree and the leakage current of the energy storage system are within a preset threshold range.
5. The protection device for an energy storage system of claim 1, wherein said protection module comprises: and the first measuring unit is used for detecting and judging that the insulation degree and the leakage current of the energy storage system are within a preset threshold range, and measuring the potential between the energy storage system and the cabinet body or the box body or the battery rack through a monitoring circuit built in the energy storage system.
6. The protection device suitable for the energy storage system according to claim 1, wherein the monitoring module comprises a monitoring unit for monitoring the current at the cabinet or the box of the energy storage system or the battery rack ground in real time through at least one leakage current sensor.
7. The protection device adapted for use in an energy storage system of claim 6, wherein said at least one leakage current sensor is a 30mA-1000mA current sensor.
8. The protection device suitable for the energy storage system according to claim 7, wherein the current sensor correspondingly outputs the measured leakage current value through an analog quantity output mode; or
The current sensor correspondingly outputs the measured leakage current value in a digital quantity output mode, wherein the judgment condition of the digital quantity output mode is whether the monitored current value exceeds a preset current threshold range.
9. The protection device applicable to the energy storage system according to claim 1, wherein the monitoring module comprises a definition unit for defining the leakage current as an overrun when the detected leakage current exceeds a current range of 30mA-1000 mA.
10. The protection device for an energy storage system of claim 1, wherein said protection module comprises: the second measuring unit is used for measuring the voltage difference of the cabinet body or the box body or the battery rack of the energy storage system when the energy storage system has electric leakage or liquid leakage;
and the position judgment unit is used for judging the specific position of electric leakage or liquid leakage of the energy storage system according to the measured voltage difference and the acquired voltage data measured by the single battery.
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