Abnormal current breaking device and method for energy storage system

Abstract

The invention provides an abnormal current breaking device and method for an energy storage system. The abnormal current breaking device comprises a power supply protection module configured between an energy storage module and a load. The power supply protection module comprises a plurality of power supply protection units, a plurality of detection units and a control unit which is in signal connection with the energy storage module, the detection units and part of the power supply protection units. Under the condition that power supply between the energy storage module and the load is abnormal, the corresponding current breaking action can be automatically executed based on the actual working condition, and therefore charging and discharging safety between the energy storage module and the load is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage systems, and in particular to an abnormal current disconnecting device and method for an energy storage system. Background Art

[0002] In an electric energy storage system, the energy storage system acts as a power source, providing electrical support to the load, enabling normal operation of the load. To ensure circuit safety, protection devices are installed within the energy storage system to protect the energy storage system by controlling the state of the circuit switches.

[0003] In existing designs of energy storage systems, several battery clusters are usually connected in parallel to output electrical energy. On this basis, when the current in the main power supply circuit is abnormal, the management system will directly cut off the main power supply circuit and stop the power output of the battery cluster, thereby realizing functions such as abnormal current protection. Only when the current fault is eliminated will the main power supply circuit be restored to power operation. However, the existing energy storage system protection triggered by abnormal current will result in long maintenance time and high cost, reducing the utilization rate of the energy storage system. In addition, the existing control method is relatively simple in classifying the abnormal working conditions of the energy storage system, and the abnormal judgment conditions for the main power supply circuit are single, which is also difficult to meet the actual use requirements of the complex working conditions of the existing energy storage system. Summary of the Invention

[0004] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of this application is to propose an abnormal current disconnecting device and method for an energy storage system, which can perform different disconnecting actions on the energy storage system under different working conditions, thereby reducing the maintenance cost of the energy storage system.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes an abnormal current disconnecting device for an energy storage system, comprising a power supply protection module, wherein the power supply protection module is used to connect the energy storage module and the load; wherein,

[0007] The power supply protection module includes a plurality of power supply protection units, a plurality of detection units, and a control unit connected to the energy storage module, the detection unit, and some of the power supply protection units by signal;

[0008] The control unit is configured to obtain the abnormal current of the power supply protection module through the detection unit, and obtain the operating temperature of the power supply protection unit through a thermistor configured in the power supply protection unit. The control unit obtains the actual working condition of the power supply protection module based on the abnormal current and / or the operating temperature, and drives part of the power supply protection unit to disconnect the abnormal current between the energy storage module and the load based on the actual working condition.

[0009] Optionally, the multiple detection units include at least a first detection unit, which is connected to the negative port of the energy storage module and is used to detect and obtain the abnormal current of the power supply protection module. The control unit obtains the actual working condition of the power supply protection module based on the magnitude of the abnormal current, and drives the corresponding power supply protection unit to perform protection action according to the actual working condition.

[0010] Optionally, the actual working condition of the power supply protection module includes at least a first working condition, a second working condition, a third working condition, and a fourth working condition; wherein,

[0011] When the abnormal current is less than or equal to a first current threshold, the power supply protection module is in the first working state;

[0012] When the abnormal current is greater than the first current threshold and less than or equal to a second current threshold, the power supply protection module is in the second working state, and the second current threshold is in a range of 1 to 5 times the first current threshold;

[0013] When the abnormal current is greater than the second current threshold and less than or equal to a third current threshold range, the power supply protection module is in the third working condition, and the range of the third current threshold is 5 to 10 times the first current threshold;

[0014] When the abnormal current is greater than the third current threshold, the power supply protection module is in the fourth working condition.

[0015] Optionally, when the operating temperature of the power supply protection unit is greater than a first temperature threshold and less than or equal to a second temperature threshold, the power supply protection module is in the second operating state; when the operating temperature of the power supply protection unit is greater than the second temperature threshold, the power supply protection module is in the third operating state;

[0016] The first temperature threshold ranges from 70°C to 100°C, and the second temperature threshold ranges from 100°C to 200°C.

[0017] Optionally, the plurality of power supply protection units include at least a first contactor, a second contactor, a first circuit breaker, a fast-blow fuse and an excitation fuse; wherein,

[0018] The first contactor and the second contactor are respectively arranged between the positive port of the energy storage module and the positive port of the load, and between the negative port of the energy storage module and the negative port of the load;

[0019] The first circuit breaker is connected to the positive terminal of the load and the negative terminal of the load respectively;

[0020] The fast-blow fuse is arranged between the positive terminal of the energy storage module and the positive terminal of the load, and the excitation fuse is arranged between the negative terminal of the energy storage module and the negative terminal of the load; or,

[0021] The excitation fuse is arranged between the positive electrode port of the energy storage module and the positive electrode port of the load, and the fast-blow fuse is arranged between the negative electrode port of the energy storage module and the negative electrode port of the load.

[0022] Optionally, the plurality of detection units further include a second detection unit, which is connected to the positive electrode port of the energy storage module and is used to detect and obtain the charge and discharge current of the energy storage module.

[0023] To achieve the above objectives, a second embodiment of the present application provides a method for interrupting abnormal current in an energy storage system, which is used to protect the power supply safety between the energy storage module and the load. The method includes a power supply protection module, wherein the power supply protection module includes multiple power supply protection units, multiple detection units, and a control unit connected to the energy storage module, the detection units, and some of the power supply protection units. The method includes the following steps:

[0024] The detection unit is used to detect the current of the power supply protection module and the abnormal current is fed back to the control unit.

[0025] Utilizing a thermal element configured in each of the power supply protection units, the operating temperature of each of the power supply protection units is detected, and the operating temperature is fed back to the control unit;

[0026] The control unit confirms the current actual working condition of the power supply protection unit based on the received abnormal current and the working temperature, and drives the corresponding power supply protection unit to perform a current interruption protection action according to the actual working condition.

[0027] Optionally, the control unit acquiring the current actual working condition of the power supply protection unit based on the received abnormal current and the working temperature includes:

[0028] When the abnormal current is less than or equal to a first current threshold, the control unit confirms that the power supply protection module is in a first operating condition;

[0029] When the abnormal current is greater than the first current threshold and less than or equal to the second current threshold, and / or when the operating temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, the control unit confirms that the power supply protection module is in the second operating state;

[0030] When the abnormal current is greater than the second current threshold and less than or equal to the third current threshold, and / or when the operating temperature is greater than the second temperature threshold, the control unit confirms that the power supply protection module is in the third operating condition;

[0031] When the abnormal current is greater than the third current threshold, the control unit confirms that the power supply protection module is in the fourth operating condition.

[0032] Optionally, the multiple power supply protection units include at least a first contactor, a second contactor, a first circuit breaker, an excitation fuse, and a fast-blow fuse, and the step of the control unit driving the corresponding power supply protection unit to perform a current interruption protection action according to actual working conditions includes:

[0033] The control unit drives the first contactor and the second contactor or the second contactor and the first contactor to sequentially perform current breaking protection actions under the first working condition;

[0034] The control unit drives the first circuit breaker to perform a current breaking protection action under the second working condition;

[0035] The control unit drives the excitation fuse to perform a current interruption protection action under the third operating condition, or, after obtaining that the fast-blow fuse automatically performs a current interruption protection action under the third operating condition, the control unit drives the excitation fuse to no longer perform a current interruption protection action.

[0036] Optionally, the fast-blow fuse automatically performs a current interruption protection action under the fourth working condition.

[0037] The abnormal current interruption device and method for the energy storage system provided by the present application have at least the following beneficial effects:

[0038] The present application provides an abnormal current disconnection device and method for an energy storage system, including a power supply protection module disposed between an energy storage module and a load. The power supply protection module includes multiple power supply protection units, multiple detection units, and a control unit signal-connected to the energy storage module, the detection units, and some of the power supply protection units. The present application is designed to automatically disconnect the current in the event of an abnormal power supply between the energy storage module and the load, thereby ensuring safe charging and discharging between the energy storage module and the load.

[0039] This application detects the power supply current and device operating temperature of the power supply protection module, and divides the power supply protection module into four different working conditions according to different working currents and device operating temperatures. Different current disconnection protection actions are performed under different working conditions, avoiding the possibility of simultaneous action of different power supply protection units, thereby reducing the subsequent maintenance cost of the energy storage system.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0042] Figure 1 Schematic diagram of the circuit structure of an abnormal current disconnecting device for an energy storage system according to an embodiment of the present application.

[0043] Figure 2 Schematic diagram of a current tolerance curve of an abnormal current interrupting device for an energy storage system according to an embodiment of the present application.

[0044] Figure 3 The figure is a flow chart of a method for disconnecting abnormal current in an energy storage system according to an embodiment of the present application.

[0045] 100 power supply protection module; 111 first detection unit; 112 second detection unit; 121 first contactor; 122 second contactor; 123 first circuit breaker; 124 excitation fuse; 125 fast-blow fuse; 126 pre-charge contactor; 200 energy storage module; 300 load. DETAILED DESCRIPTION

[0046] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0047] According to the first aspect of the present application, an abnormal current breaking device for an energy storage system is provided, such as Figure 1 As shown, the device is used to automatically perform current disconnection when there is an abnormality in the power supply between the energy storage module 200 and the load 300, thereby ensuring the charging and discharging safety between the energy storage module 200 and the load 300.

[0048] In some embodiments, the abnormal current disconnecting device of the energy storage system may include a power supply protection module 100, and the power supply protection module 100 is configured between the energy storage module 200 and the load 300. The power supply protection module 100 includes multiple power supply protection units, multiple detection units, and a control unit that is signal-connected to the energy storage module 200, the detection unit, and some of the power supply protection units. The energy storage module 200 may be a battery or a battery cluster, etc. In this embodiment, the energy storage module 200 is a battery cluster. The detection unit may be a sampling method composed of a shunt, a current sensor, a current transformer, etc., and the sampled current is obtained by current supplementation and fitting. The multiple detection units in this embodiment are all current sensors. The control unit may be a battery management system (BMS) of the battery cluster.

[0049] It can be understood that due to the signal connection between the control unit and multiple detection units, the control unit can detect the internal current state of the power supply protection unit through the detection unit, and obtain the actual working condition of the current power supply protection module 100 based on the size of the abnormal current value.

[0050] Since the control unit is connected to part of the power supply protection unit signal, the control unit can also detect the temperature state of the power supply protection unit through the thermistor part configured inside the power supply protection unit, and obtain the actual working condition of the current power supply protection module 100 according to the size of the working temperature value. The thermistor includes but is not limited to thermistors.

[0051] Furthermore, the control unit is signal-connected to some power supply protection units, so that the control unit can also select the corresponding power supply protection unit to perform a protection action based on the actual working condition of the current power supply protection module 100, such as performing an internal current disconnection protection action to quickly switch the power supply state between the energy storage module 200 and the load 300 from the on state to the off state, thereby reliably protecting the charging and discharging safety between the energy storage module 200 and the load 300.

[0052] In some embodiments, the multiple detection units include at least a first detection unit 111. The first detection unit 111 can be connected to the negative port of the energy storage module 200 and is used to detect and obtain the internal abnormal current of the power supply protection module 100, so that the control unit can obtain the actual working condition of the current power supply protection module 100 based on the magnitude of the abnormal current fed back by the first detection unit 111, and then drive the corresponding power supply protection unit to perform a protection action according to the actual working condition.

[0053] Since the control unit can determine the actual operating condition of the power supply protection module 100 based on the magnitude of the abnormal current value fed back by the first detection unit 111, the actual operating condition of the power supply protection module 100 can be divided into at least a first operating condition, a second operating condition, a third operating condition, and a fourth operating condition based on the magnitude of the abnormal current value fed back by the first detection unit 111.

[0054] As an example, when the abnormal current detected by the first detection unit 111 is less than or equal to the first current threshold, the control unit determines the actual operating condition of the power supply protection module 100 at this time as the first operating condition, and the first operating condition is the normal operating condition. When the abnormal current detected by the first detection unit 111 is greater than the first current threshold and less than or equal to the second current threshold, the control unit determines the actual operating condition of the power supply protection module 100 at this time as the second operating condition, and the second operating condition is a small-rate overload operating condition; when the abnormal current detected by the first detection unit 111 is greater than the second current threshold and less than or equal to the third current threshold, the control unit determines the actual operating condition of the power supply protection module 100 at this time as the third operating condition, and the third operating condition is a large-rate overload operating condition; and when the abnormal current detected by the first detection unit 111 is greater than the third current threshold, the control unit determines the actual operating condition of the power supply protection module 100 at this time as the fourth operating condition, and the fourth operating condition is a short-circuit operating condition.

[0055] As an example, the first current threshold may be the rated current of the energy storage system, the second current threshold may be 1 to 5 times the first current threshold, and the third current threshold may be 5 to 10 times the first current threshold.

[0056] In addition, since the control unit can also detect the operating temperature of the power supply protection unit through the thermistor configured in the power supply protection unit, the actual operating condition of the power supply protection module 100 can be further determined according to the size of the operating temperature value, and the actual operating condition of the power supply protection module 100 determined by the operating temperature value can be combined with the actual operating condition of the power supply protection module 100 determined by the abnormal current value into the same operating condition, thereby reducing the complexity of the subsequent control unit in matching the actual operating condition with the corresponding power supply protection unit to perform the protection action.

[0057] As an example, when the operating temperature of the power supply protection unit is greater than the first temperature threshold and less than or equal to the second temperature threshold, the control unit can classify the actual operating condition of the power supply protection module 100 at this time as the second operating condition; when the operating temperature of the power supply protection unit is greater than the second temperature threshold, the control unit can classify the actual operating condition of the power supply protection module 100 at this time as the third operating condition.

[0058] As an example, the first temperature threshold range is between 70°C and 100°C. This temperature threshold range exceeds the normal operating temperature of the power supply protection unit, but does not affect the operation of the power supply protection unit. The second temperature threshold range is between 100°C and 200°C. This temperature threshold range exceeds the operating temperature of the power supply protection unit and may affect the safe operation of the power supply protection unit.

[0059] In some embodiments, multiple power supply protection units may include at least a first contactor 121, a second contactor 122, a first circuit breaker 123, a fast-blow fuse 125 and an excitation fuse 124, and the thermistor is at least configured in any one or more of the first contactor 121, the second contactor 122, the first circuit breaker 123, the fast-blow fuse 125 and the excitation fuse 124.

[0060] The first contactor 121 and the second contactor 122 are respectively arranged between the positive port of the energy storage module 200 and the positive port of the load 300, and between the negative port of the energy storage module 200 and the negative port of the load 300. The first circuit breaker 123 is connected to the positive port of the load 300 and the negative port of the load 300, respectively. The fast-blow fuse 125 is arranged between the positive port of the energy storage module 200 and the positive port of the load 300. The excitation fuse 124 is arranged between the negative port of the energy storage module 200 and the negative port of the load 300. Alternatively, the excitation fuse 124 is arranged between the positive port of the energy storage module 200 and the positive port of the load 300, and the fast-blow fuse 125 is arranged between the negative port of the energy storage module 200 and the negative port of the load 300.

[0061] As an example, Figure 1 and Figure 2 As shown, the control unit can sequentially drive the first contactor 121 and the second contactor 122 or the second contactor 122 and the first contactor 121 to perform a current disconnection protection action under a first operating condition. For example, when the energy storage module 200 supplies power to the load 300 and the power supply protection unit is in the first operating condition, the control unit sequentially drives the first contactor 121 and the second contactor 122 to perform a current disconnection action. When the load 300 supplies power to the energy storage module 200 and the power supply protection unit is in the first operating condition, the control unit sequentially drives the second contactor 122 and the first contactor 121 to perform a current disconnection protection action.

[0062] Furthermore, because the abnormal current of the power supply protection module 100 is less than or equal to the first current threshold in the first operating condition, the control unit can also drive the first circuit breaker 123 to perform a current interruption protection action to disconnect the power supply between the energy storage module 200 and the load 300. Considering that the first contactor 121 and the second contactor 122 have the highest number of switching cycles (or switching life), the control unit preferably drives the first contactor 121 and the second contactor 122 to perform a current interruption protection action in the first operating condition.

[0063] As an example, the control unit can drive the first circuit breaker 123 to perform a protection action under the second operating condition. Since the maximum tripping time of the first circuit breaker 123 is shorter than that of the first contactor 121 and the second contactor 122, and the abnormal current of the power supply protection module 100 under the second operating condition is greater than the first current threshold and less than or equal to the second current threshold, and / or the operating temperature of the components (the first contactor 121, the second contactor 122, the first circuit breaker 123, the excitation fuse 124, and the fast-blow fuse 125, etc.) is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the abnormal current between the first current threshold and the second current threshold will directly cause the switching life of the first contactor 121 / or the second contactor 122 to be sharply reduced. Therefore, in order to avoid damaging the first contactor 121 and the second contactor 122, the control unit preferably drives the first circuit breaker 123 to perform the current interruption protection action under the second operating condition.

[0064] As an example, the control unit drives the excitation fuse 124 to perform a protection action under the third operating condition. Because the abnormal current of the power supply protection module 100 under the third operating condition is greater than the second current threshold and less than or equal to the third current threshold, and / or the operating temperature of the components (first contactor 121, second contactor 122, first circuit breaker 123, excitation fuse 124, and fast-blow fuse 125, etc.) is greater than the second temperature threshold. Therefore, in order to ensure the power supply safety between the energy storage module 200 and the load 300, the control unit preferably drives the excitation fuse 124 to perform the current disconnection protection action and quickly disconnects the power supply between the energy storage module 200 and the load 300 within a time range of the millisecond level.

[0065] As an example, fast-blow fuse 125 automatically performs a protective action under the fourth operating condition. Because the abnormal current of power supply protection module 100 in the fourth operating condition exceeds the third current threshold, the specific values of the abnormal current and temperature are no longer sufficient as reference conditions. Therefore, to ensure the safe power supply between energy storage module 200 and load 300, fast-blow fuse 125 automatically performs a current interruption protection action within a millisecond timeframe, disconnecting the power supply between energy storage module 200 and load 300.

[0066] It should be noted that the control unit also receives the results of protective actions performed by the first contactor 121, the second contactor 122, the first circuit breaker 123, the excitation fuse 124, and the fast-blow fuse 125. For example, if the first contactor 121 and the second contactor 122 fail to perform a protective action, the control unit detects that the abnormal current has not been successfully interrupted. The control unit triggers a sticking alarm for the first contactor 121 and the second contactor 122, and simultaneously activates the first circuit breaker 123 to perform a protective action. Similarly, if the first circuit breaker 123 fails to perform a protective action, the control unit detects that the abnormal current has not been successfully interrupted, the control unit triggers a sticking alarm for the first circuit breaker 123, and simultaneously activates the excitation fuse 124 to perform a protective action. If the excitation fuse 124 and the fast-blow fuse 125 fail to perform a protective action, the control unit detects that the abnormal current has not been successfully interrupted, and the control unit triggers an abnormal alarm for the excitation fuse 124 and the fast-blow fuse 125, requiring personnel to perform a manual current interruption operation.

[0067] In addition, since the withstand times of the fast-blow fuse 125 and the excitation circuit breaker overlap under different currents, in the third operating condition, the control unit needs to obtain the blown state of the fast-blow fuse 125 before driving the excitation circuit breaker 124 to perform the current breaking protection action. After obtaining the information that the fast-blow fuse 125 has performed the breaking action, it stops driving the excitation circuit breaker 124 and then performs the protection action.

[0068] In some embodiments, the plurality of detection units further includes a second detection unit 112. The second detection unit 112 can be connected to the positive terminal of the energy storage module 200 to detect the input or output current (charge and discharge current) of the energy storage module 200. Since the second detection unit 112 is signal-connected to the control unit, the control unit can calculate or detect the remaining capacity (State of Charge; SOC) of the energy storage module 200 based on the current detected and fed back by the second detection unit 112.

[0069] In some embodiments, the power supply protection module 100 also includes a pre-charging resistor R and a pre-charging contactor 126. The pre-charging contactor 126 is connected in series with the pre-charging resistor R and in parallel with the first contactor 121. It is set in the power supply module to limit the charging and discharging current between the energy storage module 200 and the load 300, and can protect electrical devices to prevent the starting current from being too large and causing current shock to other electrical devices in the power supply protection module 100.

[0070] According to the second aspect of the present application, a method for disconnecting abnormal current in an energy storage system is also provided, which is used to protect the power supply safety between the energy storage module 200 and the load 300, including setting a power supply protection module 100 between the energy storage module 200 and the load 300. The power supply protection module 100 includes multiple power supply protection units, multiple detection units, and a control unit connected to the energy storage module 200, the detection unit, and some power supply protection units. Figures 1 to 3 As shown, the method includes the steps of:

[0071] S1, using the detection unit to detect the current of the power supply protection module 100, and feeding back the abnormal current to the control unit; at the same time, using the thermistor configured in each power supply protection unit, detecting the operating temperature of each power supply protection unit, and feeding back the operating temperature to the control unit;

[0072] S2, the control unit confirms the current actual working condition of the power supply protection unit based on the received abnormal current and working temperature, and drives the corresponding power supply protection unit to perform current disconnection protection action according to the actual working condition.

[0073] In some embodiments, the control unit acquires the current actual working condition of the power supply protection unit based on the received abnormal current and working temperature, including:

[0074] When the abnormal current is less than or equal to the first current threshold, the control unit confirms that the power supply protection module 100 is in the first operating state;

[0075] When the abnormal current is greater than the first current threshold and less than or equal to the second current threshold, and / or the operating temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, the control unit confirms that the power supply protection module 100 is in the second operating state;

[0076] When the abnormal current is greater than the second current threshold and less than or equal to the third current threshold, and / or the operating temperature is greater than the second temperature threshold, the control unit confirms that the power supply protection module 100 is in the third operating state; and

[0077] When the abnormal current is greater than the third current threshold, the power supply protection module 100 is in the fourth working state.

[0078] The second current threshold is 1 to 5 times the first current threshold, the third current threshold is 5 to 10 times the first current threshold, the first temperature threshold is between 70°C and 100°C, and the second temperature threshold is between 100°C and 200°C.

[0079] In some embodiments, the multiple power supply protection units include at least a first contactor 121, a second contactor 122, a first circuit breaker 123, an excitation fuse 124, and a fast-blow fuse 125. The control unit drives the corresponding power supply protection unit to perform a current interruption protection action according to the actual working conditions, including the following steps:

[0080] The control unit drives the first contactor 121 and the second contactor 122, or the second contactor 122 and the first contactor 121, in sequence to perform current interruption protection in the first operating condition. The control unit drives the first circuit breaker 123 to perform current interruption protection in the second operating condition. The control unit drives the excitation fuse 124 to perform current interruption protection in the third operating condition. Alternatively, after the control unit obtains the automatic current interruption protection action of the fast-blow fuse 125 in the third operating condition, it drives the excitation fuse 124 not to perform the current interruption protection action. Furthermore, the fast-blow fuse 125 will also automatically perform the current interruption protection action in the fourth operating condition.

[0081] It should be noted that for details not described in the abnormal current interruption method for the energy storage system, reference may be made to the contents disclosed in different embodiments of the abnormal current interruption device for the energy storage system, and no detailed description will be given here.

[0082] According to the third aspect of the present application, an energy storage system is also provided, which includes an energy storage system abnormal current disconnecting device according to any of the above embodiments, and uses the energy storage system abnormal current disconnecting method according to the above embodiments to perform abnormal current disconnection on the power supply between the energy storage module 200 and the load 300.

[0083] In summary, the present application provides an abnormal current disconnection device and method for an energy storage system, including a power supply protection module 100 disposed between an energy storage module 200 and a load 300. The power supply protection module 100 includes multiple power supply protection units, multiple detection units, and a control unit signal-connected to the energy storage module 200, the detection units, and some of the power supply protection units. This application is designed to automatically disconnect the current when an abnormality occurs in the power supply between the energy storage module 200 and the load 300, thereby ensuring the safe charging and discharging between the energy storage module 200 and the load 300.

[0084] The present application detects the power supply current and device operating temperature of the power supply protection module 100, and divides the power supply protection module 100 into four different operating conditions according to different operating currents and device operating temperatures. Different current disconnection protection actions are performed correspondingly under different operating conditions, avoiding the possibility of different power supply protection units operating at the same time, thereby reducing the subsequent maintenance costs of the energy storage system.

[0085] In the descriptions of the foregoing embodiments, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

Claims

1. An abnormal current breaking device for an energy storage system, characterized in that: It includes a power supply protection module, which is used to connect the energy storage module and the load; wherein, The power supply protection module includes a plurality of power supply protection units, a plurality of detection units, and a control unit connected to the energy storage module, the detection unit, and some of the power supply protection units by signal; The control unit is configured to obtain the abnormal current of the power supply protection module through the detection unit, and obtain the operating temperature of the power supply protection unit through a thermistor configured in the power supply protection unit. The control unit obtains the actual working condition of the power supply protection module based on the abnormal current and / or the operating temperature, and drives part of the power supply protection unit to disconnect the abnormal current between the energy storage module and the load based on the actual working condition.

2. The abnormal current breaking device for energy storage system according to claim 1, characterized in that: The multiple detection units include at least a first detection unit, which is connected to the negative port of the energy storage module and is used to detect and obtain the abnormal current of the power supply protection module. The control unit obtains the actual working condition of the power supply protection module based on the magnitude of the abnormal current, and drives the corresponding power supply protection unit to perform protection action according to the actual working condition.

3. The abnormal current breaking device for energy storage system according to claim 1, characterized in that: The actual working conditions of the power supply protection module include at least the first working condition, the second working condition, the third working condition, and the fourth working condition; wherein, When the abnormal current is less than or equal to a first current threshold, the power supply protection module is in the first working state; When the abnormal current is greater than the first current threshold and less than or equal to a second current threshold, the power supply protection module is in the second working state, and the second current threshold is in a range of 1 to 5 times the first current threshold; When the abnormal current is greater than the second current threshold and less than or equal to a third current threshold range, the power supply protection module is in the third working condition, and the range of the third current threshold is 5 to 10 times the first current threshold; When the abnormal current is greater than the third current threshold, the power supply protection module is in the fourth working condition.

4. The abnormal current breaking device for energy storage system according to claim 3, characterized in that: When the operating temperature of the power supply protection unit is greater than the first temperature threshold and less than or equal to the second temperature threshold, the power supply protection module is in the second working state; When the operating temperature of the power supply protection unit is greater than the second temperature threshold, the power supply protection module is in the third working state; The first temperature threshold ranges from 70°C to 100°C, and the second temperature threshold ranges from 100°C to 200°C.

5. The abnormal current breaking device for energy storage system according to claim 1, characterized in that: The plurality of power supply protection units include at least a first contactor, a second contactor, a first circuit breaker, a fast-blow fuse and an excitation fuse; wherein, The first contactor and the second contactor are respectively arranged between the positive port of the energy storage module and the positive port of the load, and between the negative port of the energy storage module and the negative port of the load; The first circuit breaker is connected to the positive terminal of the load and the negative terminal of the load respectively; The fast-blow fuse is arranged between the positive terminal of the energy storage module and the positive terminal of the load, and the excitation fuse is arranged between the negative terminal of the energy storage module and the negative terminal of the load; or, The excitation fuse is arranged between the positive electrode port of the energy storage module and the positive electrode port of the load, and the fast-blow fuse is arranged between the negative electrode port of the energy storage module and the negative electrode port of the load.

6. The abnormal current breaking device for energy storage system according to claim 1, characterized in that: The plurality of detection units further include a second detection unit, which is connected to the positive electrode port of the energy storage module and is used to detect and obtain the charge and discharge current of the energy storage module.

7. A method for disconnecting abnormal current in an energy storage system, used to protect the power supply safety between the energy storage module and the load, characterized in that: The method comprises a power supply protection module, wherein the power supply protection module comprises a plurality of power supply protection units, a plurality of detection units, and a control unit connected to the energy storage module, the detection units, and some of the power supply protection units by signal; the method comprises the steps of: Utilizing the detection unit to detect the current of the power supply protection module and feeding back abnormal current to the control unit; Utilizing a thermal element configured in each of the power supply protection units, the operating temperature of each of the power supply protection units is detected, and the operating temperature is fed back to the control unit; The control unit confirms the current actual working condition of the power supply protection unit based on the received abnormal current and the working temperature, and drives the corresponding power supply protection unit to perform a current interruption protection action according to the actual working condition.

8. The method according to claim 7, characterized in that The control unit acquiring the current actual working condition of the power supply protection unit based on the received abnormal current and the working temperature includes: When the abnormal current is less than or equal to a first current threshold, the control unit confirms that the power supply protection module is in a first operating condition; When the abnormal current is greater than the first current threshold and less than or equal to the second current threshold, and / or when the operating temperature is greater than the first temperature threshold and less than or equal to the second temperature threshold, the control unit confirms that the power supply protection module is in the second operating state; When the abnormal current is greater than the second current threshold and less than or equal to the third current threshold, and / or when the operating temperature is greater than the second temperature threshold, the control unit confirms that the power supply protection module is in the third operating condition; When the abnormal current is greater than the third current threshold, the control unit confirms that the power supply protection module is in the fourth operating condition.

9. The method according to claim 8, characterized in that The multiple power supply protection units include at least a first contactor, a second contactor, a first circuit breaker, an excitation fuse, and a fast-blow fuse. The control unit drives the corresponding power supply protection unit to perform a current breaking protection action according to the actual working conditions, including: The control unit drives the first contactor and the second contactor or the second contactor and the first contactor to sequentially perform current breaking protection actions under the first working condition; The control unit drives the first circuit breaker to perform a current breaking protection action under the second working condition; The control unit drives the excitation fuse to perform a current interruption protection action under the third operating condition, or, after obtaining that the fast-blow fuse automatically performs a current interruption protection action under the third operating condition, the control unit drives the excitation fuse to no longer perform a current interruption protection action.

10. The method according to claim 9, characterized in that The fast-blow fuse automatically performs a current breaking protection action under the fourth working condition.

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