Relays, energy storage systems, control methods and electrical equipment

Abstract

This application relates to a relay, an energy storage system, a control method, and an electrical device. The relay includes a coil circuit, main circuit contacts, a current detection component, and a relay diagnostic circuit. The relay diagnostic circuit is connected to both the coil circuit and the current detection component. The current detection component collects the current in the main circuit where the main circuit contacts are located and sends the main circuit current to the relay diagnostic circuit. The relay diagnostic circuit controls the coil circuit to switch to an open state when the main circuit current exceeds a preset current, thereby controlling the main circuit contacts to switch to an open state. Therefore, in this embodiment, the current detection component inside the relay can quickly detect whether there is an overcurrent in the main circuit, and the relay diagnostic circuit can promptly disconnect the relay, thus protecting the relay and / or the electrical device.

Description

[0001] This invention patent application is a divisional application of Chinese invention patent application filed on May 29, 2024, with application number 2024106763611 and title "Relay, Energy Storage System, Control Method and Electrical Equipment". Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a relay, an energy storage system, a control method, and an electrical device. Background Technology

[0003] Typically, the output of the energy storage component in electrical equipment can be connected to external components via a relay. The main circuit containing the relay can be a high-voltage circuit; if an overcurrent occurs in the high-voltage circuit, it may cause damage to the relay and / or the electrical equipment.

[0004] Therefore, how to quickly detect overcurrent in the main circuit and disconnect the relay in a timely manner is an urgent problem to be solved. Summary of the Invention

[0005] In view of the above problems, this application provides a relay, energy storage system, control method and electrical equipment that can quickly detect whether there is an overcurrent in the main circuit and disconnect the relay in a timely manner.

[0006] In a first aspect, this application provides a relay, which includes: a coil circuit, main circuit contacts, a current detection component, and a relay diagnostic circuit. The relay diagnostic circuit is connected to both the coil circuit and the current detection component. The current detection component is used to collect the current of the main circuit where the main circuit contacts are located and send the current of the main circuit to the relay diagnostic circuit. The relay diagnostic circuit is used to control the coil circuit to switch to an open state when the current of the main circuit is greater than a preset current, so as to control the main circuit contacts to switch to an open state.

[0007] The relay also includes an auxiliary contact connected to the main circuit contacts, and the output terminal of the auxiliary contact is connected to the relay diagnostic circuit. The auxiliary contact is used to send a status diagnostic signal to the relay diagnostic circuit. The status diagnostic signal of the auxiliary contact is used to indicate the open and closed state of the auxiliary contact. The relay diagnostic circuit is also used to determine the open and closed state of the auxiliary contact based on the status diagnostic signal. The open and closed state of the auxiliary contact is used to indicate the open and closed state of the main circuit contacts.

[0008] The output of the relay diagnostic circuit is also connected to the controller; the relay diagnostic circuit is also used to output a relay fault status signal to the controller based on the current of the main circuit, wherein the relay fault status signal is used to indicate whether there is an overcurrent in the relay.

[0009] In this embodiment, on the one hand, by collecting the main circuit current through a current detection component installed inside the relay, the presence of overcurrent in the main circuit can be quickly detected. Furthermore, by using a relay diagnostic circuit, when the main circuit current detected by the current detection component exceeds a preset current, the coil circuit can be promptly switched to an open state, and the main circuit contacts can be promptly switched to an open state, achieving the goal of timely relay disconnection, thereby protecting the relay and / or electrical equipment. On the other hand, in this embodiment, by setting auxiliary contacts in the relay and sending a status diagnostic signal of the auxiliary contacts to the relay diagnostic circuit, it is not necessary to wait for the external high voltage on the main circuit to be released after the main circuit contacts are disconnected. The relay diagnostic circuit can quickly determine the opening and closing state of the main circuit contacts based on the status diagnostic signal, thereby improving the detection efficiency of the opening and closing state of the main circuit contacts. Furthermore, in this embodiment, by using a relay diagnostic circuit to output a relay fault status signal to the controller based on the main circuit current, the controller can quickly determine whether there is overcurrent in the relay based on the relay fault status signal, so that the corresponding first preset protection measures can be executed in a timely manner, thereby further improving the protection effect of the relay and / or electrical equipment.

[0010] In some embodiments, the auxiliary contact is a mirror image of the main circuit contact; when the main circuit contact is in an open state, the auxiliary contact is in a closed state; when the main circuit contact is in a closed state, the auxiliary contact is in an open state.

[0011] In some embodiments, the output of the relay diagnostic circuit is also connected to the controller; the relay diagnostic circuit is also used to output a relay status diagnostic signal to the controller based on the opening and closing status of the auxiliary contacts, wherein the relay status diagnostic signal is used to indicate the opening and closing status of the main circuit contacts.

[0012] In this embodiment, by using a relay diagnostic circuit to output a relay status diagnostic signal to the controller based on the opening and closing status of the auxiliary contacts, it is not necessary to wait for the external high voltage on the main circuit to be released after the main circuit contacts are disconnected. The controller can quickly determine the opening and closing status of the main circuit contacts based on the relay status diagnostic signal, thereby improving the detection efficiency of the opening and closing status of the main circuit contacts.

[0013] In some embodiments, the relay diagnostic circuit includes: an auxiliary contact diagnostic module, wherein the input terminal of the auxiliary contact diagnostic module is connected to the output terminal of the auxiliary contact, and the output terminal of the auxiliary contact diagnostic module is connected to the controller; the auxiliary contact diagnostic module is used to output a relay status diagnostic signal to the controller based on the opening and closing state of the auxiliary contact, so that the controller can quickly determine the opening and closing state of the main circuit contacts based on the relay status diagnostic signal.

[0014] In some embodiments, the relay diagnostic circuit includes an overcurrent diagnostic module and a fault handling module; wherein, the input terminal of the overcurrent diagnostic module is connected to the output terminal of the current detection component, the output terminal of the overcurrent diagnostic module is connected to the input terminal of the fault handling module, the first output terminal of the fault handling module is connected to the coil circuit, and the second output terminal of the fault handling module is connected to the controller; the overcurrent diagnostic module is used to send an overcurrent diagnostic signal to the fault handling module when the current in the main circuit is greater than a preset current; the fault handling module is used to control the coil circuit to switch to an open state according to the overcurrent diagnostic signal and output a relay fault status signal to the controller.

[0015] In this embodiment, when the current in the main circuit exceeds a preset current, the overcurrent diagnostic module can send an overcurrent diagnostic signal to the fault handling module. This allows the fault handling module to control the coil circuit to switch to an open state based on the overcurrent diagnostic signal, enabling timely switching of the main circuit contacts to the open state without waiting for controller intervention. Furthermore, the fault handling module outputs a relay fault status signal to the controller based on the overcurrent diagnostic signal, allowing the controller to quickly determine whether an overcurrent condition exists in the relay and promptly execute the corresponding first preset protection measure.

[0016] Secondly, this application provides an energy storage system, which includes a relay as described in any of the first aspects above, and a controller connected to the relay; wherein the controller is configured to: acquire a relay status diagnostic signal and a relay fault status signal sent by a relay diagnostic circuit in the relay; wherein the relay status diagnostic signal is used to indicate the opening and closing state of the main circuit contacts in the relay, and the relay fault status signal is used to indicate whether there is an overcurrent condition in the relay; and determine whether the relay is faulty based on the relay fault status signal and / or the relay status diagnostic signal.

[0017] In this embodiment, the controller determines whether a relay is faulty by using a relay status diagnostic signal and / or a relay fault status signal. Since the relay status diagnostic signal and the relay fault status signal are sent by the relay diagnostic circuit in the relay, the controller can quickly determine the fault condition of the relay.

[0018] In some embodiments, the controller is specifically configured to: determine that the relay has a failure to close if the relay status diagnostic signal indicates that the main circuit contact is open when the main circuit contact is in a closed state.

[0019] In some embodiments, the controller is specifically configured to: determine that the relay has an overcurrent fault or the relay control circuit has a fault if the relay fault status signal is used to indicate that the relay has an overcurrent condition.

[0020] In some embodiments, if there is an overcurrent fault in the relay or a fault in the relay control circuit, and the relay status diagnostic signal is used to indicate that the main circuit contacts are in a closed state, the controller is further used to: control the main circuit contacts to be in an open state.

[0021] In some embodiments, the controller is specifically configured to: when the main circuit contacts in the control relay are in an open state, if the relay status diagnostic signal is used to indicate that the main circuit contacts are in a closed state, determine that the relay has a failure to disconnect or a relay control circuit failure.

[0022] In some embodiments, the energy storage system further includes: a high-voltage sampling circuit connected to the controller; the high-voltage sampling circuit is used to detect the voltage difference between the outer and inner sides of the main circuit contacts and send the voltage difference to the controller; the controller is also used to: determine the opening and closing state of the main circuit contacts based on the voltage difference; if the voltage difference indicates that the main circuit contacts are in an open state, determine that there is a fault in the relay control circuit; if the voltage difference indicates that the main circuit contacts are in a closed state, determine that there is a fault in the relay that cannot be disconnected.

[0023] In this embodiment, by further combining the voltage difference between the outer and inner sides of the main circuit contacts detected by the high-voltage sampling circuit, the fault type of the relay can be detected more accurately, so that maintenance personnel can perform accurate maintenance on the relay, thereby improving maintenance efficiency.

[0024] In some embodiments, the energy storage system further includes a drive circuit, wherein the power supply enable terminal of the controller is connected to the power supply terminal of the relay through the drive circuit; wherein the controller is also used to control the opening and closing state of the drive circuit to control whether the power supply is supplying power to the power supply terminal of the relay.

[0025] In this embodiment, by setting a drive circuit between the power enable terminal of the controller and the power supply terminal of the relay, and by controlling the opening and closing state of the drive circuit to control whether the power supply is supplying power to the power supply terminal of the relay, the power supply terminal of the relay can be provided with electrical energy that meets the required voltage, so as to facilitate the normal operation of the relay.

[0026] In some embodiments, the driving circuit includes: a first driving circuit and a second driving circuit; the power supply includes a first power supply and a second power supply; the power supply terminal of the coil circuit in the relay is connected to the first power supply enable terminal of the controller and the first power supply through the first driving circuit; the power supply terminal of the relay diagnostic circuit in the relay is connected to the second power supply enable terminal of the controller and the second power supply through the second driving circuit; wherein, the controller is specifically used to: control the opening and closing state of the first driving circuit to control whether the first power supply supplies power to the coil circuit, and control the opening and closing state of the second driving circuit to control whether the second power supply supplies power to the relay diagnostic circuit.

[0027] In this embodiment, the power supply terminal of the coil circuit in the relay and the power supply terminal of the relay diagnostic circuit can be connected to the corresponding power supply enable terminal of the controller through the corresponding drive circuit. The controller can flexibly provide the power supply terminal of the coil circuit in the relay and the power supply terminal of the relay diagnostic circuit with the required voltage by controlling the opening and closing state of the corresponding drive circuit to control whether the corresponding power supply is powered.

[0028] In some embodiments, the energy storage system further includes: a power supply diagnostic circuit connected to the controller, wherein the power supply terminal of the power supply diagnostic circuit is connected to a detection power supply, the first transmission terminal of the power supply diagnostic circuit is connected to the power supply terminals of the first drive circuit and the coil circuit respectively, and the second transmission terminal of the power supply diagnostic circuit is connected to the power supply terminals of the second drive circuit and the relay diagnostic circuit respectively; wherein the power supply diagnostic circuit is used to adjust the operating state under the control of the drive signal of the controller and return a diagnostic feedback signal to the controller; the controller is also used to: determine the power supply short circuit condition of the coil circuit and the relay diagnostic circuit according to the drive signal and / or the diagnostic feedback signal.

[0029] In this application, by setting a power supply diagnostic circuit between the controller and the relay, the controller determines the power supply short circuit status of the coil circuit and the relay diagnostic circuit based on the drive signal sent to the power supply diagnostic circuit and / or the diagnostic feedback signal returned by the power supply diagnostic circuit. This allows the corresponding second preset protection measures to be executed in a timely manner when a power supply short circuit is detected, thereby meeting the relay control and diagnosis requirements of ASILC and improving the stability of the relay and / or electrical equipment.

[0030] In some embodiments, the first drive terminal of the power supply diagnostic circuit is connected to the first drive enable terminal of the controller, and the second drive terminal of the power supply diagnostic circuit is connected to the second drive enable terminal of the controller; the controller is specifically used to: if the voltage of the first drive signal of the first drive enable terminal or the voltage of the second drive signal of the second drive enable terminal is not less than the first preset voltage, then determine that there is a short power supply fault in the coil circuit or the relay diagnostic circuit.

[0031] In this embodiment, the controller can quickly and accurately determine whether there is a short power supply fault in the coil circuit or the relay diagnostic circuit based on the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal.

[0032] In some embodiments, the power supply diagnostic circuit includes a first diagnostic branch and a second diagnostic branch. The first return check terminal of the first diagnostic branch is connected to the first diagnostic terminal of the controller, and the second return check terminal of the second diagnostic branch is connected to the second diagnostic terminal of the controller. The controller is further configured to: if the voltage of the first drive signal of the first drive enable terminal or the voltage of the second drive signal of the second drive enable terminal is less than a first preset voltage, control the target diagnostic branch in the power supply diagnostic circuit to adjust its operating state through the target drive signal of the target drive enable terminal; wherein, the target drive enable terminal is the first drive enable terminal or the second drive enable terminal, and correspondingly, the target diagnostic branch is the first diagnostic branch or the second diagnostic branch. The power supply diagnostic circuit is specifically configured to: return a target diagnostic return check signal to the controller through the target return check terminal; wherein, the target return check terminal is the first return check terminal or the second return check terminal; the target diagnostic return check signal is used to indicate the voltage of the target return check terminal; the controller is further configured to: if the voltage of the target diagnostic return check signal is not greater than the second preset voltage, determine that there is a short-ground fault in the coil circuit or the relay diagnostic circuit.

[0033] In this embodiment, the controller uses the target drive signal at the target drive enable terminal to control the target diagnostic branch in the power supply diagnostic circuit to adjust its operating state, so that the power supply diagnostic circuit returns a target diagnostic feedback signal to the controller through the target feedback terminal. Further, if the voltage of the target diagnostic feedback signal is not greater than a second preset voltage, the controller can determine that a short-to-ground fault exists in the coil circuit or relay diagnostic circuit. Therefore, in this embodiment, the controller can quickly and accurately determine whether a short-to-ground fault exists in the coil circuit or relay diagnostic circuit by combining the target drive signal and the target diagnostic feedback signal.

[0034] In some embodiments, the controller is further configured to: if the voltage of the target diagnostic feedback signal is greater than a second preset voltage, and the voltage of the diagnostic feedback signal of other diagnostic branches in the power supply diagnostic circuit besides the target diagnostic branch is not less than a first preset voltage, then determine that there is a short circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit.

[0035] In some embodiments, the first diagnostic branch includes a first diagnostic switch, a first pull-up resistor, a first pull-down resistor, and a second pull-down resistor connected in series with the detection power supply; the driving terminal of the first diagnostic switch is connected to the first driving enable terminal of the controller; the connection point between the first pull-up resistor and the first pull-down resistor is connected to the power supply terminals of the first driving circuit and the coil circuit, respectively; and the connection point between the first pull-down resistor and the second pull-down resistor is connected to the first diagnostic terminal of the controller.

[0036] In some embodiments, the second diagnostic branch includes a second diagnostic switch, a second pull-up resistor, a third pull-down resistor, and a fourth pull-down resistor connected in series with the detection power supply; the driving terminal of the second diagnostic switch is connected to the second driving enable terminal of the controller; the connection point between the second pull-up resistor and the third pull-down resistor is connected to the power supply terminals of the second driving circuit and the relay diagnostic circuit, respectively; and the connection point between the third pull-down resistor and the fourth pull-down resistor is connected to the second diagnostic terminal of the controller.

[0037] Thirdly, this application provides a control method for a relay, which is applied to a relay as described in any of the first aspects above. The method includes: a detection component in the relay collects the current of the main circuit where the main circuit contact is located, and sends the current of the main circuit to a relay diagnostic circuit; when the current of the main circuit is greater than a preset current, the relay diagnostic circuit controls the coil circuit in the relay to switch to an open state, so as to control the main circuit contact to switch to an open state.

[0038] The method further includes: an auxiliary contact in the relay sending a status diagnostic signal of the auxiliary contact to the relay diagnostic circuit; wherein the status diagnostic signal of the auxiliary contact is used to indicate the opening and closing state of the auxiliary contact; the relay diagnostic circuit determines the opening and closing state of the auxiliary contact based on the status diagnostic signal; wherein the opening and closing state of the auxiliary contact is used to indicate the opening and closing state of the main circuit contact.

[0039] The method also includes: a relay diagnostic circuit outputs a relay fault status signal to the controller based on the current in the main circuit, wherein the relay fault status signal is used to indicate whether there is an overcurrent condition in the relay.

[0040] Fourthly, this application provides a control method for an energy storage system, which is applied to an energy storage system as described in any of the second aspects above. The method includes: a processor acquiring a relay status diagnostic signal and a relay fault status signal sent by a relay diagnostic circuit in the energy storage system; wherein the relay status diagnostic signal is used to indicate the opening and closing status of the main circuit contacts of the relay in the energy storage system, and the relay fault status signal is used to indicate whether there is an overcurrent condition in the relay; the processor determines whether there is a fault in the relay based on the relay fault status signal and / or the relay status diagnostic signal.

[0041] Fifthly, this application provides an electrical device, including an energy storage system as described in any of the second aspects above.

[0042] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 Schematic diagrams of the structure of relays provided in some embodiments of this application;

[0045] Figure 2 Schematic diagrams of the relay structure provided for other embodiments of this application;

[0046] Figure 3 Schematic diagrams of the relay structure provided for other embodiments of this application;

[0047] Figure 4 Schematic diagrams of the relay structure provided for other embodiments of this application;

[0048] Figure 5 Schematic diagrams of the relay structure provided for other embodiments of this application;

[0049] Figure 6 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0050] Figure 7 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0051] Figure 8 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0052] Figure 9 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0053] Figure 10 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0054] Figure 11 A flowchart illustrating the relay fault detection method provided in this application embodiment. Figure 1 ;

[0055] Figure 12 A flowchart illustrating the relay fault detection method provided in this application embodiment. Figure 2 ;

[0056] Figure 13 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0057] Figure 14 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0058] Figure 15 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0059] Figure 16 Schematic diagrams of the energy storage system provided in other embodiments of this application;

[0060] Figure 17 A schematic flowchart illustrating a power supply short-circuit detection method for an energy storage system provided in some embodiments of this application;

[0061] Figure 18 A schematic flowchart illustrating a relay control method provided in some embodiments of this application;

[0062] Figure 19 This is a flowchart illustrating the control method of an energy storage system provided in some embodiments of this application. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the term "comprising" and any variations thereof in the specification, claims and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more (including two), unless otherwise explicitly defined.

[0066] The electrical equipment provided in this application embodiment can be, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0067] It should be noted that, for ease of explanation, the following embodiments use an electric vehicle as an example of the electrical equipment in this application. It should be understood that when the electrical equipment in this application is other equipment, the implementation principle and technical effect are similar.

[0068] Typically, the output of the energy storage component in electrical equipment can be connected to external components via a relay. The main circuit containing the relay can be a high-voltage circuit; if an overcurrent occurs in the high-voltage circuit, it may cause damage to the relay and / or the electrical equipment.

[0069] Therefore, how to quickly detect overcurrent in the main circuit and disconnect the relay in a timely manner is an urgent problem to be solved.

[0070] To address the aforementioned issues, this application proposes a method of quickly detecting overcurrent in the main circuit by using a current detection component located inside the relay to collect the main circuit current. Furthermore, by incorporating a relay diagnostic circuit within the relay, if the main circuit current detected by the current detection component exceeds a preset current, the coil circuit can be promptly switched to an open state, and the main circuit contacts can be promptly switched to an open state. This achieves the goal of timely relay disconnection, thereby protecting the relay and / or the electrical equipment.

[0071] In some embodiments, Figure 1 This application provides schematic diagrams of the structure of relays in some embodiments, such as... Figure 1 As shown, the relay in this embodiment may include, but is not limited to, a coil circuit 10, a main circuit contact 11, a current detection component 12, and a relay diagnostic circuit 13. The relay diagnostic circuit 13 may be connected to both the coil circuit 10 and the current detection component 12.

[0072] In this embodiment, the coil circuit 10 can refer to the circuit to which the coil belongs in the relay, and can be used to control the opening and closing state of the main circuit contact 11.

[0073] For example, the coil circuit 10 may include, but is not limited to, a coil and a coil drive circuit. For instance, when the coil drive circuit is closed and the coil is provided with a preset electrical energy sufficient for its operation, current flows through the coil, causing the main circuit contact 11 to be closed. Conversely, when the coil drive circuit is open, or when the coil is not provided with a preset electrical energy sufficient for its operation, no current flows through the coil, causing the main circuit contact 11 to be open.

[0074] In this embodiment, the main circuit contact 11 can refer to a contact disposed in the main circuit. For example, the main circuit contact 11 may include, but is not limited to, a main positive contact and / or a main negative contact. One end of the main positive contact can be connected to the positive terminal of the energy storage component in the electrical device, and the other end can be connected to an external component; one end of the main negative contact can be connected to the negative terminal of the energy storage component in the electrical device, and the other end can be connected to the aforementioned external component or other external components.

[0075] The current detection component 12 in this embodiment can be used to collect the current of the main circuit where the main circuit contact is located, and send the current of the main circuit to the relay diagnostic circuit 13.

[0076] In one possible implementation, the current detection component 12 can be a current sensor. For example, the current detection component 12 can be, but is not limited to, a Hall sensor. The distance between the current detection component 12 and the main circuit can be less than a preset detection distance of the current detection component 12, so as to facilitate the acquisition of the current in the main circuit where the main circuit contact 11 is located. Of course, the current detection component 12 can also be other types of current sensors, which will not be described in detail in this embodiment.

[0077] In another possible implementation, the current sensing component 12 can be a current sensing circuit, which can be connected to the main circuit to collect the current in the main circuit. For example, the current sensing circuit can be connected to one end of the main negative contact.

[0078] For example, the current detection component 12 can collect the current of the main circuit in real time and send the collected current of the main circuit to the relay diagnostic circuit 13. In another example, the current detection component 12 can collect the current of the main circuit at preset intervals and send the collected current of the main circuit to the relay diagnostic circuit 13.

[0079] It should be understood that in this embodiment of the application, by collecting the main circuit current through the current detection component 12 located inside the relay and sending the collected main circuit current to the relay diagnostic circuit 13 inside the relay, the overcurrent situation in the main circuit can be quickly detected.

[0080] The relay diagnostic circuit 13 in this embodiment can be used to control the coil circuit 10 to switch to an open state when the current in the main circuit is greater than a preset current, thereby controlling the main circuit contact 11 to switch to an open state. The preset current can refer to the short-circuit current threshold of the relay.

[0081] In this embodiment, when the current in the main circuit is greater than the preset current (i.e., there is an overcurrent in the main circuit), the relay diagnostic circuit 13 can promptly control the coil circuit 10 to switch to the open state, so as to promptly control the main circuit contact 11 to switch to the open state, thereby achieving the purpose of timely disconnecting the relay.

[0082] In summary, the relay in this embodiment may include a coil circuit, main circuit contacts, a current detection component, and a relay diagnostic circuit, with the relay diagnostic circuit connected to both the coil circuit and the current detection component. The current detection component collects the current in the main circuit where the main circuit contacts are located and sends this current to the relay diagnostic circuit. The relay diagnostic circuit controls the coil circuit to switch to an open state when the main circuit current exceeds a preset current, thereby controlling the main circuit contacts to switch to an open state. Therefore, in this embodiment, by collecting the main circuit current using a current detection component located inside the relay, an overcurrent condition in the main circuit can be quickly detected. Furthermore, the relay diagnostic circuit 13 can promptly control the coil circuit 10 to switch to an open state and the main circuit contacts 11 to switch to an open state when the main circuit current detected by the current detection component 12 exceeds a preset current, achieving the goal of timely disconnection of the relay and thus protecting the relay and / or electrical equipment.

[0083] In some embodiments, Figure 2 The diagram below illustrates the structure of a relay according to other embodiments of this application. Based on the above embodiments, and considering the need for rapid detection of the opening and closing status of the main circuit contacts in the relay during practical applications, such as... Figure 2 As shown, the relay in this embodiment may further include an auxiliary contact 14 connected to the main circuit contact 11, so that the opening and closing state of the auxiliary contact 14 can be related to the opening and closing state of the main circuit contact 11. The connection between the auxiliary contact 14 and the main circuit contact 11 may include, but is not limited to: a mechanical connection between the auxiliary contact 14 and the main circuit contact 11, and / or an electrical connection between the auxiliary contact 14 and the main circuit contact 11.

[0084] In one possible implementation, the auxiliary contact 14 can be a mirror image of the main circuit contact 11. Specifically, when the main circuit contact 11 is in the open state, the auxiliary contact 14 can be in the closed state; when the main circuit contact 11 is in the closed state, the auxiliary contact 14 can be in the open state.

[0085] For example, if the main circuit contact 11 is a normally open contact, then the auxiliary contact 14 can be a normally closed contact.

[0086] In another possible implementation, the auxiliary contact 14 can be a synchronous contact of the main circuit contact 11. Specifically, when the main circuit contact 11 is in the open state, the auxiliary contact 14 can be in the open state; when the main circuit contact 11 is in the closed state, the auxiliary contact 14 can be in the closed state.

[0087] In this embodiment, the output terminal of the auxiliary contact 14 can be connected to the relay diagnostic circuit 13 so that the auxiliary contact 14 can send a status diagnostic signal to the relay diagnostic circuit 13. The status diagnostic signal can be used to indicate the open / closed state of the auxiliary contact 14. For example, when the auxiliary contact 14 is in a closed state, the level of the status diagnostic signal can be a first level; when the auxiliary contact 14 is in an open state, the level of the status diagnostic signal can be a second level; wherein the first level can be greater than the second level.

[0088] As another example, when the auxiliary contact 14 is in the closed state, the level of the status diagnostic signal can be the second level; when the auxiliary contact 14 is in the open state, the level of the status diagnostic signal can be the first level.

[0089] In this embodiment, the relay diagnostic circuit 13 can determine the opening and closing state of the auxiliary contact 14 based on the status diagnostic signal. It should be understood that since the opening and closing state of the auxiliary contact 14 can be related to the opening and closing state of the main circuit contact 11, and the opening and closing state of the auxiliary contact 14 can be used to indicate the opening and closing state of the main circuit contact 11, the relay diagnostic circuit 13 can indirectly determine the opening and closing state of the main circuit contact 11 based on the status diagnostic signal.

[0090] In summary, compared to the related technologies that determine the opening and closing state of the main circuit contacts based on the voltage difference between the inner and outer sides of the main circuit contacts collected by the high-voltage sampling circuit, the embodiments of this application, by setting auxiliary contacts in the relay and sending the status diagnosis signal of the auxiliary contacts to the relay diagnostic circuit, do not require waiting for the external high voltage on the main circuit to be released after the main circuit contacts are opened. The relay diagnostic circuit can quickly determine the opening and closing state of the main circuit contacts based on the status diagnosis signal, thereby improving the detection efficiency of the opening and closing state of the main circuit contacts.

[0091] In some embodiments, based on the above embodiments, such as Figure 2 As shown, the output of the relay diagnostic circuit 13 can also be connected to the controller 2 of the energy storage system. For example, the controller 2 may include, but is not limited to, a battery management system (BMS).

[0092] The relay diagnostic circuit 13 in this embodiment can also be used to output a relay status diagnostic signal to the controller 2 based on the opening and closing state of the auxiliary contact 14. The relay status diagnostic signal can be used to indicate the opening and closing state of the main circuit contact 11, so that the controller 2 can quickly determine the opening and closing state of the main circuit contact 11 based on the relay status diagnostic signal without waiting for the external high voltage to be released.

[0093] For example, when the auxiliary contact 14 is in the closed state, the level of the relay status diagnostic signal can be the third level; when the auxiliary contact 14 is in the open state, the level of the relay status diagnostic signal can be the fourth level; wherein, the third level can be greater than the fourth level.

[0094] As another example, when the auxiliary contact 14 is in the closed state, the level of the relay status diagnostic signal can be the fourth level; when the auxiliary contact 14 is in the open state, the level of the relay status diagnostic signal can be the third level.

[0095] It should be understood that, considering that the relay diagnostic circuit 13 can also send other signals to the controller 2, the first output terminal of the relay diagnostic circuit 13 can be connected to the first input terminal of the controller 2 of the energy storage system so that the relay diagnostic circuit 13 can output a relay status diagnostic signal to the controller 2.

[0096] In summary, compared to the related technologies that determine the opening and closing state of the main circuit contacts based on the voltage difference between the inner and outer sides of the main circuit contacts collected by the high-voltage sampling circuit, the embodiment of this application uses a relay diagnostic circuit to output a relay status diagnostic signal to the controller based on the opening and closing state of the auxiliary contacts. This eliminates the need to wait for the external high voltage on the main circuit to be released after the main circuit contacts are disconnected. The controller can quickly determine the opening and closing state of the main circuit contacts based on the relay status diagnostic signal, thereby improving the detection efficiency of the opening and closing state of the main circuit contacts.

[0097] In some embodiments, Figure 3 The following are schematic diagrams of the relay structure provided in other embodiments of this application. Based on the above embodiments, this application provides further illustrative descriptions of the relevant content of the relay diagnostic circuit 13. For example... Figure 3 As shown, the relay diagnostic circuit 13 in this embodiment may include an auxiliary contact diagnostic module 130.

[0098] For example, the input terminal of the auxiliary contact diagnostic module 130 can be connected to the output terminal of the auxiliary contact 14 to obtain the status diagnostic signal of the auxiliary contact 14. The output terminal of the auxiliary contact diagnostic module 130 can be connected to the controller 2 to output a relay status diagnostic signal to the controller 2 based on the opening and closing state of the auxiliary contact 14, so that the controller 2 can quickly determine the opening and closing state of the main circuit contacts based on the relay status diagnostic signal.

[0099] It should be understood that the output of the auxiliary contact diagnostic module 130 can be the first output of the relay diagnostic circuit 13, which is connected to the first input of the controller 2 of the energy storage system.

[0100] In some embodiments, the relay diagnostic circuit 13 in this application can also be used to output a relay fault status signal to the controller 2 based on the current of the main circuit collected by the current detection component. The relay fault status signal can be used to indicate whether the relay is experiencing an overcurrent condition, so that the controller 2 can quickly determine whether the relay is experiencing an overcurrent condition based on the relay fault status signal. The reasons for the relay experiencing an overcurrent condition may include, but are not limited to, a short circuit in the main circuit.

[0101] For example, when the current in the main circuit is greater than the preset current, the level of the relay fault status signal can be the fifth level; when the current in the main circuit is not greater than the preset current, the level of the relay fault status signal can be the sixth level; wherein, the fifth level can be greater than the sixth level.

[0102] As another example, when the current in the main circuit is greater than the preset current, the level of the relay fault status signal can be the sixth level; when the current in the main circuit is not greater than the preset current, the level of the relay fault status signal can be the fifth level.

[0103] It should be understood that, considering that the relay diagnostic circuit 13 can also send other signals to the controller 2, the second output terminal of the relay diagnostic circuit 13 can be connected to the second input terminal of the controller 2 of the energy storage system, so that the relay diagnostic circuit 13 can output a relay fault status signal to the controller 2.

[0104] In summary, in this embodiment of the application, by using a relay diagnostic circuit to output a relay fault status signal to the controller based on the current of the main circuit, the controller can quickly determine whether there is an overcurrent in the relay based on the relay fault status signal, so as to execute the corresponding first preset protection measures in a timely manner, thereby further improving the protection effect of the relay and / or electrical equipment.

[0105] In some embodiments, Figure 4 The following are schematic diagrams of the relay structure provided in other embodiments of this application. Based on the above embodiments, this application provides further illustrative descriptions of the relevant content of the relay diagnostic circuit 13. For example... Figure 4 As shown, the relay diagnostic circuit 13 in this embodiment may include an overcurrent diagnostic module 131 and a fault handling module 132.

[0106] The input terminal of the overcurrent diagnostic module 131 in this embodiment can be connected to the output terminal of the current detection component 12 to obtain the current of the main circuit collected by the current detection component 12 and determine whether the current of the main circuit is greater than the preset current.

[0107] In this embodiment, the output of the overcurrent diagnostic module 131 can be connected to the input of the fault handling module 132, so that the overcurrent diagnostic module 131 can send an overcurrent diagnostic signal to the fault handling module 132 when the current in the main circuit is greater than a preset current. The overcurrent diagnostic signal can be used to indicate that an overcurrent condition exists in the relay.

[0108] The first output terminal of the fault handling module 132 in this embodiment can be connected to the coil circuit 10 so that the fault handling module 132 can control the coil circuit 10 to switch to the disconnected state according to the overcurrent diagnostic signal, so that the main circuit contact 11 switches to the disconnected state.

[0109] As can be seen, in this embodiment of the application, when the current in the main circuit is greater than the preset current, the overcurrent diagnosis module 131 can send an overcurrent diagnosis signal to the fault handling module 132, so that the fault handling module 132 can control the coil circuit 10 to switch to the open state according to the overcurrent diagnosis signal, and can switch the main circuit contact 11 to the open state in a timely manner without waiting for the controller to control.

[0110] The second output terminal of the fault handling module 132 in this embodiment can be connected to the controller 2 so that the fault handling module 132 can output a relay fault status signal to the controller 2 according to the overcurrent diagnostic signal, so that the controller 2 can quickly determine whether there is an overcurrent in the relay according to the relay fault status signal, and thus execute the corresponding first preset protection measures in a timely manner.

[0111] It should be noted that, when the current in the main circuit is not greater than the preset current, the overcurrent diagnosis module 131 can also send a current diagnosis signal to the fault handling module 132. The current diagnosis signal can be used to indicate that there is no overcurrent in the relay.

[0112] Correspondingly, the fault handling module 132 can output a relay fault status signal (used to indicate that there is no overcurrent in the relay) to the controller 2 based on the current diagnostic signal, so that the controller 2 can quickly determine whether there is an overcurrent in the relay based on the relay fault status signal.

[0113] It should be understood that the second output terminal of the fault handling module 132 can be the second output terminal of the relay diagnostic circuit 13, which is connected to the second input terminal of the controller 2 of the energy storage system.

[0114] In some embodiments, Figure 5 The following are schematic diagrams of the structure of a relay provided in other embodiments of this application. Based on the above embodiments, the embodiments of this application provide an exemplary description of the overall structure of the relay, such as... Figure 5 As shown, the relay in this embodiment may include: a coil circuit 10, a main circuit contact (or relay high-voltage contact) 11 disposed in the main circuit, a current detection component 12, a relay diagnostic circuit 13, and an auxiliary contact 14. The auxiliary contact 14 may be a mirror image of the main circuit contact 11.

[0115] For example, the coil circuit 10 may include a coil 100 and a coil drive circuit 101. The main circuit contact 11 may include a main positive contact 110 and a main negative contact 111; one end of the main positive contact 110 may be connected to the positive terminal of the energy storage component Es in the electrical device, and the other end of the main positive contact may be connected to an external component; one end of the main negative contact 111 may be connected to the negative terminal of the energy storage component Es, and the other end of the main negative contact 111 may be connected to the aforementioned external component or other external components.

[0116] For example, the relay diagnostic circuit 13 may include an auxiliary contact diagnostic module 130, an overcurrent diagnostic module 131, and a fault handling module 132.

[0117] The input terminal of the auxiliary contact diagnostic module 130 can be connected to the output terminal of the auxiliary contact 14 so as to obtain the status diagnostic signal of the auxiliary contact 14. The output terminal of the auxiliary contact diagnostic module 130 can be connected to the first input terminal of the controller 2 so as to output the relay status diagnostic signal to the controller 2 based on the opening and closing state of the auxiliary contact 14.

[0118] The input terminal of the overcurrent diagnosis module 131 can be connected to the output terminal of the current detection component 12 to acquire the current of the main circuit collected by the current detection component 12 and determine whether the current of the main circuit is greater than a preset current. The output terminal of the overcurrent diagnosis module 131 can be connected to the input terminal of the fault handling module 132 so that the overcurrent diagnosis module 131 can send an overcurrent diagnosis signal to the fault handling module 132 when the current of the main circuit is greater than the preset current.

[0119] The first output terminal of the fault handling module 132 can be connected to the coil drive circuit 101 so that the fault handling module 132 can control the coil drive circuit 101 to switch to an open state according to the overcurrent diagnostic signal, thereby switching the main circuit contact 11 to an open state. For example, the fault handling module 132 can send a shutdown signal to the coil drive circuit 101 to switch the coil drive circuit 101 to an open state.

[0120] The second output terminal of the fault handling module 132 can be connected to the second input terminal of the controller 2 so that the fault handling module 132 can output a relay fault status signal to the controller 2 according to the overcurrent diagnosis signal, so that the controller 2 can quickly determine whether there is an overcurrent in the relay according to the relay fault status signal.

[0121] In this embodiment, the implementation methods of each module can be referred to the relevant content in the above embodiments, and will not be repeated here.

[0122] It should be noted that, compared to the related technologies where a fuse (thermal fuse) can be installed between the relay and the energy storage component, the overcurrent threshold of the relay and the fusing curve of the fuse may not match, which may lead to the risk of the relay sticking together or even exploding. In the embodiment of this application, the relay can realize the function of a fuse by setting a current detection component 12, a relay diagnostic circuit 13 and an auxiliary contact 14 inside. Therefore, it is not necessary to install a fuse between the relay and the energy storage component, thereby solving the problem of selecting and matching fuses and relays in the related technologies.

[0123] In some embodiments, Figure 6 This is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application, such as... Figure 6 As shown, the energy storage system in this application embodiment may include a relay 1 as provided in any of the above embodiments of this application, and a controller 2 connected to the relay 1.

[0124] In this embodiment, the controller 2 can acquire the relay status diagnostic signal and the relay fault status signal sent by the relay diagnostic circuit 13 in the relay 1. The relay status diagnostic signal can be used to indicate the open / closed state of the main circuit contact 11 in the relay 1, and the relay fault status signal can be used to indicate whether the relay 1 has a short circuit.

[0125] Furthermore, the controller 2 can determine whether relay 1 is faulty based on relay fault status signals and / or relay status diagnostic signals. The fault may include, but is not limited to, at least one of the following: inability to close the loop, overcurrent fault, relay control circuit fault, and inability to disconnect (or what may be called a sticking fault). Specifically, an inability to close refers to a relay stuck in the open state and unable to close; an inability to disconnect refers to a relay stuck in the closed state and unable to disconnect; and a relay control circuit fault may include, but is not limited to, a fault in the relay's drive circuit and / or a fault in the relay's coil drive circuit.

[0126] In one possible implementation, the controller 2 can be specifically used to: if the relay status diagnostic signal indicates that the main circuit contact 11 is in the open state when the main circuit contact 11 is in the closed state, then it can be determined that the relay 1 has a failure to close.

[0127] In this implementation, the controller 2 can determine that the main circuit contact 11 is stuck in the open state and cannot close, even when the main circuit contact 11 should be in the closed state. However, if the relay status diagnostic signal obtained from the relay diagnostic circuit 13 indicates that the main circuit contact 11 is in the open state, the controller 2 can determine that the relay 1 is stuck in the open state and cannot close, indicating a failure to close.

[0128] In another possible implementation, controller 2 can be specifically used to: if the relay fault status signal is used to indicate that relay 1 has an overcurrent fault or a relay control circuit fault, then it can be determined that relay 1 has an overcurrent fault.

[0129] In this implementation, if the relay fault status signal obtained from the relay diagnostic circuit 13 is used to indicate that the relay 1 has an overcurrent condition, the controller 2 can determine that the relay 1 has an overcurrent fault or a relay control circuit fault.

[0130] In some embodiments, if there is an overcurrent fault in the relay or a fault in the relay control circuit, and the relay status diagnostic signal is used to indicate that the main circuit contact 11 is in a closed state, the controller 2 can also be used to control the main circuit contact 11 to be in an open state.

[0131] In this embodiment of the application, when the relay fault status signal is used to indicate that there is an overcurrent in the relay 1, but the relay status diagnostic signal is used to indicate that the main circuit contact 11 is in a closed state, the controller 2 can also control the main circuit contact 11 to be in an open state so as to protect the relay and / or the electrical equipment.

[0132] In another possible implementation, the controller 2 can be specifically used to: when the main circuit contact 11 in the control relay 1 is in the open state, if the relay status diagnostic signal is used to indicate that the main circuit contact 11 is in the closed state, it can be determined that the relay 1 has a failure to disconnect or a relay control circuit failure.

[0133] In this implementation, the controller 2 can determine that the main circuit contact 11 in the control relay 1 is stuck in the closed state and cannot be disconnected, even when the main circuit contact 11 should be in the open state. This means that the main circuit contact 11 should be in the open state, but the relay status diagnostic signal obtained from the relay diagnostic circuit 13 indicates that the main circuit contact 11 is in the closed state. This indicates that the relay 1 is stuck in the closed state and cannot be disconnected, indicating a failure to disconnect, or that there is a control circuit fault in the relay diagnostic circuit 13.

[0134] It should be understood that in the event of a fault in the relay control circuit, the relay diagnostic circuit 13 may not function properly. Therefore, there may be a situation where the relay 1 is in the open state, but the acquired relay status diagnostic signal is used to indicate that the main circuit contact 11 is in the closed state, that is, the relay status diagnostic signal is incorrect.

[0135] In some embodiments, Figure 7 The diagram below illustrates the structure of an energy storage system provided in other embodiments of this application. Based on the above embodiments, considering the potential failure of the relay control circuit, this application embodiment can further incorporate a high-voltage sampling circuit to detect the voltage difference between the inner and outer sides of the main circuit contacts, determining the opening and closing state of the main circuit contacts, thereby facilitating the detection of the type of relay fault. For example... Figure 7 As shown, the energy storage system in this embodiment may further include a high-voltage sampling circuit 3 connected to the controller 2.

[0136] The high-voltage sampling circuit 3 in this embodiment can be used to detect the voltage difference between the outer and inner sides of the main circuit contact 11 and send the voltage difference to the controller 2. For example, the voltage difference between the outer and inner sides of the main circuit contact 11 may include, but is not limited to: the voltage difference between the outer and inner sides of the main positive contact, and / or, the voltage difference between the outer and inner sides of the main negative contact.

[0137] It should be noted that when any contact is in the closed state, the voltage difference between the outer and inner sides of the contact can be less than the preset voltage difference; when any contact is in the open state, the voltage difference between the outer and inner sides of the contact can be no less than the preset voltage difference.

[0138] The controller 2 in this embodiment can also be used to: determine the opening and closing state of the main circuit contacts based on the voltage difference; if the voltage difference indicates that the main circuit contacts are in the open state, then determine that there is a fault in the relay control circuit; if the voltage difference indicates that the main circuit contacts are in the closed state, then determine that there is a fault in the relay that cannot be disconnected.

[0139] In this embodiment, the controller 2 can determine the open / closed state of the main circuit contact 11 by comparing the voltage difference between the outer and inner sides of the main circuit contact 11 with a preset voltage difference. For example, if the voltage difference between the outer and inner sides of the main circuit contact 11 is less than the preset voltage difference, the controller 2 can determine that the main circuit contact is in a closed state. Alternatively, if the voltage difference between the outer and inner sides of the main circuit contact 11 is not less than the preset voltage difference, the controller 2 can determine that the main circuit contact is in an open state.

[0140] Furthermore, if the voltage difference indicates that the main circuit contact 11 is in the open state, that is, the relay status diagnostic signal obtained by the relay diagnostic circuit 13 is incorrect, the controller 2 can determine that there is a fault in the relay control circuit, which may cause the relay diagnostic circuit 13 to fail to operate normally.

[0141] Furthermore, if the voltage difference indicator main circuit contact 11 is in the closed state, that is, the relay status diagnosis signal obtained by the relay diagnostic circuit 13 is correct, then the controller 2 can determine that the relay has a failure to disconnect.

[0142] In summary, in the embodiments of this application, when the main circuit contacts in the control relay are in an open state, if the relay status diagnostic signal is used to indicate that the main circuit contacts are in a closed state, by further combining the voltage difference between the outer and inner sides of the main circuit contacts detected by the high-voltage sampling circuit, the fault type of the relay can be detected more accurately, so that maintenance personnel can perform accurate maintenance on the relay, thereby improving maintenance efficiency.

[0143] It should be understood that even if the relay control circuit fails, the voltage difference between the inner and outer sides of the main circuit contacts detected by the high-voltage sampling circuit can still be used to determine whether the main circuit contacts are in an open or closed state, which helps to improve the flexibility of detecting the open or closed state of the main circuit contacts.

[0144] In some embodiments, Figure 8This is a schematic diagram of the energy storage system provided in other embodiments of this application. Based on the above embodiments, considering that the voltage of the power supply enable terminal of the controller may not meet the voltage requirements of the power supply terminal of the relay, such as... Figure 8 As shown, the energy storage system in this embodiment may further include a drive circuit 4, wherein the power supply enable terminal of the controller 2 can be connected to the power supply terminal of the relay 1 through the drive circuit 4.

[0145] The controller 2 in this embodiment can also be used to control the opening and closing state of the drive circuit 4, so as to control whether the power supply Ps supplies power to the power supply terminal of the relay 1. It should be understood that the power supply Ps can be connected to the power supply terminal of the relay 1 through the drive circuit 4. When the drive circuit 4 is in the closed state, the power supply Ps can supply power to the power supply terminal of the relay 1; when the drive circuit 4 is in the open state, the power supply Ps cannot supply power to the power supply terminal of the relay 1.

[0146] In one possible implementation, if the required voltage of each module in relay 1 is consistent, the power supply enable terminal of controller 2 can be connected to the power supply terminal of relay 1 through a drive circuit 4. This can provide the relay with electrical energy that meets the required voltage, while also saving circuit cost and circuit size.

[0147] In another possible implementation, if the required voltages of at least two modules in relay 1 are inconsistent, the power supply enable terminal of controller 2 can be connected to the power supply terminal of each module in relay 1 through at least two drive circuits 4 respectively, so as to flexibly provide the corresponding modules with electrical energy that meets the required voltage.

[0148] In summary, in this embodiment of the application, by setting a drive circuit between the power enable terminal of the controller and the power supply terminal of the relay, and by controlling the opening and closing state of the drive circuit to control whether the power supply is supplying power to the power supply terminal of the relay, the power supply terminal of the relay can be provided with electrical energy that meets the required voltage, so as to facilitate the normal operation of the relay.

[0149] In some embodiments, Figure 9 This is a schematic diagram of the energy storage system provided in other embodiments of this application. Based on the above embodiments, this application uses a relay including a coil circuit 10 and a relay diagnostic circuit 13 as an example to illustrate the relevant content of the drive circuit 4. Figure 9 As shown, the driving circuit 4 may include a first driving circuit 40 and a second driving circuit 41, and the power supply Ps may include a first power supply Ps1 and a second power supply Ps2. For example, the supply voltage of the first power supply Ps1 and the supply voltage of the second power supply Ps2 may be the same.

[0150] The power supply terminal of the coil circuit 10 in relay 1 can be connected to the first power supply enable terminal and the first power supply Ps1 of controller 2 via the first drive circuit 40. The power supply terminal of the relay diagnostic circuit 13 in relay 1 can be connected to the second power supply enable terminal and the second power supply Ps2 of controller 2 via the second drive circuit 41. For example, the power supply terminal of the relay diagnostic circuit 13 in relay 1 is the power supply terminal of the relay control circuit; wherein, the relay control circuit may include, but is not limited to, the relay diagnostic circuit 13.

[0151] The controller 2 in this embodiment can be specifically used to: control the opening and closing state of the first drive circuit 40 to control whether the first power supply Ps1 supplies power to the coil circuit 10, and control the opening and closing state of the second drive circuit 41 to control whether the second power supply Ps2 supplies power to the relay diagnostic circuit 13.

[0152] For example, the controller 2 can control the opening and closing state of the first drive circuit 40 by sending a first enable signal to the first drive circuit 40 through the first power supply enable terminal, thereby controlling whether the first power supply Ps1 supplies power to the coil circuit 10. For example, if the level of the first enable signal is the seventh level, the controller 2 can control the first drive circuit 40 to be in the closed state to control the first power supply Ps1 to supply power to the coil circuit 10; if the level of the first enable signal is the eighth level, the controller 2 can control the first drive circuit 40 to be in the open state to control the first power supply Ps1 to be unable to supply power to the coil circuit 10; wherein, the seventh level can be greater than the eighth level.

[0153] For example, the controller 2 can control the opening and closing state of the second drive circuit 41 by sending a second enable signal to the second drive circuit 41 through the second power supply enable terminal, thereby controlling whether the second power supply Ps2 supplies power to the relay diagnostic circuit 13. For example, if the level of the second enable signal is the ninth level, the controller 2 can control the second drive circuit 41 to be in the closed state to control the second power supply Ps2 to supply power to the relay diagnostic circuit 13; if the level of the second enable signal is the tenth level, the controller 2 can control the second drive circuit 41 to be in the open state to control the second power supply Ps2 to not supply power to the relay diagnostic circuit 13; wherein, the ninth level can be greater than the tenth level.

[0154] It should be understood that controller 2 controls the second drive circuit 41 to be in a closed state to control the second power supply Ps2 to supply power to the relay diagnostic circuit 13, that is, controls the second power supply Ps2 to also supply power to the relay control circuit. Controller 2 controls the second drive circuit 41 to be in a closed state to prevent the second power supply Ps2 from supplying power to the relay diagnostic circuit 13, that is, controls the second power supply Ps2 to also prevent it from supplying power to the relay control circuit.

[0155] In summary, in the embodiments of this application, the power supply terminal of the coil circuit in the relay and the power supply terminal of the relay diagnostic circuit can be connected to the corresponding power supply enable terminal of the controller through the corresponding drive circuit. The controller can flexibly provide the power supply terminal of the coil circuit in the relay and the power supply terminal of the relay diagnostic circuit with the required voltage by controlling the opening and closing state of the corresponding drive circuit to control whether the corresponding power supply is supplied.

[0156] In some embodiments, Figure 10 The diagram below illustrates the structure of an energy storage system provided in other embodiments of this application. Based on the above embodiments, this application uses a controller, drive circuit, and relay as examples to exemplarily describe the relevant content of the energy storage system. The implementation methods of each module in the relay in this application embodiment can be referred to the above. Figure 5 The relevant details of the illustrated embodiments will not be repeated here. The following embodiments of this application mainly provide exemplary descriptions of the connection method between the controller and the relay.

[0157] like Figure 10 As shown, considering that the voltage of the power supply enable terminal of the controller may not meet the voltage requirements of the power supply terminal of the relay diagnostic circuit and the power supply terminal of the coil 100 (e.g., 12V or 24V), in this embodiment, the first power supply enable terminal of the controller 2 can be connected to the power supply terminal of the coil 100 through the first drive circuit 40 to supply power to the coil 100, and the second power supply enable terminal of the controller 2 can be connected to the power supply terminal of the relay diagnostic circuit 13 through the second drive circuit 41 to supply power to the relay control circuit, etc.

[0158] Since the voltage of the power supply enable terminal of controller 2 can meet the power supply voltage requirements of the coil drive circuit 101 (e.g., 3.3V or 5V), the third power supply enable terminal of controller 2 can be directly connected to the power supply terminal of coil drive circuit 101.

[0159] For example, when the level of the first enable signal at the first power supply enable terminal is the seventh level (or referred to as coil 100 power supply enable) and the level of the third enable signal at the third power supply enable terminal is the seventh level (or referred to as coil drive circuit 101 power supply enable), the first drive circuit 40 can be in a closed state, and the coil circuit 10 can operate normally, that is, the coil drive circuit 101 is in a closed state, current can flow through the coil 100, and the main positive contact 110 and the main negative contact 111 can be in a closed state. It should be understood that when the level of the first enable signal at the first power supply enable terminal is the eighth level or the level of the third enable signal at the third power supply enable terminal is the eighth level, that is, when the power supply terminal of the coil 100 is disconnected or the power supply terminal of the coil drive circuit 101 is disconnected, no current flows through the coil 100, and the main positive contact 110 and the main negative contact 111 can be in an open state.

[0160] For example, when the level of the second enable signal at the second power supply enable terminal is the ninth level, the second drive circuit can be in a closed state, and the relay diagnostic circuit 13 can operate normally. It should be understood that when the second drive circuit is in a closed state, the relay control circuit can also operate normally.

[0161] It should be understood that Figure 10 The example shown uses GPIO1 as the first power enable terminal, GPIO5 as the second power enable terminal, and GPIO2 as the third power enable terminal. Of course, the first power enable terminal, the second power enable terminal, or the third power enable terminal can also be other ports in the controller, and this application embodiment does not limit this.

[0162] For example, the output of the auxiliary contact diagnostic module 130 can be connected to the first input of the controller 2 so that a relay status diagnostic signal can be output to the controller 2 based on the open / closed state of the auxiliary contact 14.

[0163] For example, the output of the overcurrent diagnostic module 131 can be connected to the input of the fault handling module 132 so that the overcurrent diagnostic module 131 can send an overcurrent diagnostic signal to the fault handling module 132 when the current in the main circuit is greater than the preset current.

[0164] It should be understood that Figure 10 The example shown uses ADC1 as the first input terminal and ADC2 as the second input terminal. Of course, the first or second input terminal can also be other ports in the controller depending on the signal type. This application does not limit this.

[0165] It should be noted that when the controller determines that the relay needs to be disconnected or when the relay status diagnostic signal indicates that the relay is faulty, the controller needs to disconnect both the power supply terminal of the coil drive circuit 101 and the power supply terminal of the coil 100, which is beneficial for protecting the relay.

[0166] In some embodiments, Figure 11 A flowchart illustrating the relay fault detection method provided in this application embodiment. Figure 1 Based on the above embodiments, the method of this application embodiment may include the following steps:

[0167] Step S1101: The controller is powered on at low voltage.

[0168] Step S1102: The controller controls the relay diagnostic circuit to be in operation.

[0169] For example, the controller can control the level of the second enable signal to the ninth level, so that the second drive circuit can be in a closed state and the relay diagnostic circuit 13 can operate normally, for example, for relay status diagnosis and relay fault detection.

[0170] Step S1103: The controller determines whether the pre-charging process is complete.

[0171] It should be understood that since there are usually large parasitic capacitors on the outside of the high-voltage circuit of electric vehicles, a pre-charging process is required before closing the relay of the main circuit after receiving the high-voltage command from the vehicle. When the voltage difference between the inside and outside of the relay is less than a certain value, the pre-charging process can be considered to be completed.

[0172] If the pre-charging process is completed, proceed to step S1104; if the pre-charging process is not completed, return to step S1103.

[0173] Step S1104: The controller switches the control coil circuit to a closed state.

[0174] For example, the controller can enable the power supply to the coil 100 and the coil drive circuit 101, so that the coil circuit switches to a closed state, so that the main circuit contacts can switch to a closed state.

[0175] Step S1105: The controller determines whether the main circuit contacts are in a closed state based on the relay status diagnostic signal.

[0176] If the relay status diagnostic signal determines that the main circuit contact is in the open state, step S1106 can be executed; if the relay status diagnostic signal determines that the main circuit contact is in the closed state, step S1107 can be executed.

[0177] Step S1106: The controller determines that the relay has a failure to close.

[0178] It should be understood that the controller can also report to the vehicle controller that a relay has a failure to close.

[0179] Step S1107: The controller determines whether there is an overcurrent fault in the relay based on the relay fault status signal.

[0180] If the relay fault status signal indicates that the relay has an overcurrent fault, then proceed to step S1108; if the relay fault status signal indicates that the relay does not have an overcurrent fault, then proceed to step S1110.

[0181] Step S1108: The controller controls the main circuit contacts to be in the open state.

[0182] For example, the controller can disconnect the power supply terminal of the coil 100 and the power supply terminal of the coil drive circuit 101, so that the coil circuit is switched to the disconnected state, so that the main circuit contacts can be switched to the disconnected state.

[0183] Step S1109: The controller determines that there is an overcurrent fault in the relay or a fault in the relay control circuit.

[0184] It should be understood that the controller can also report relay overcurrent faults or relay control circuit faults to the vehicle controller.

[0185] Step S1110: The controller determines whether the relay needs to be disconnected.

[0186] For example, the controller can determine whether it has received a high-voltage command from the vehicle or whether the controller is faulty.

[0187] If it is determined that the relay needs to be disconnected, proceed to step S1111; if it is determined that the relay does not need to be disconnected, return to step S1107.

[0188] Step S1111: The controller controls the main circuit contacts to be in the open state.

[0189] For example, the controller can disconnect the power supply terminal of the coil 100 and the power supply terminal of the coil drive circuit 101, so that the coil circuit is switched to the disconnected state, so that the main circuit contacts can be switched to the disconnected state.

[0190] Step S1112: The controller determines whether the main circuit contacts are in the open state based on the relay status diagnostic signal.

[0191] If the relay status diagnostic signal determines that the main circuit contact is in the open state, the detection process can be terminated; if the relay status diagnostic signal determines that the main circuit contact is in the closed state, step S1113 can be executed.

[0192] Step S1113: The controller determines that the relay has a fault that it cannot disconnect.

[0193] It should be understood that the controller can also report to the vehicle controller that a relay has a failure to disconnect.

[0194] It should be noted that the implementation methods of each step in the embodiments of this application can refer to the relevant content in the above embodiments, and will not be repeated here.

[0195] In some embodiments, Figure 12 A flowchart illustrating the relay fault detection method provided in this application embodiment. Figure 2 Based on the above embodiments, this application embodiment further incorporates the voltage difference between the outer and inner sides of the main circuit contacts detected by the high-voltage sampling circuit. The method of this application embodiment may include the following steps:

[0196] Step S1201: The controller determines whether the pre-charging process is complete.

[0197] If the pre-charging process is completed, proceed to step S1202; if the pre-charging process is not completed, repeat step S1201.

[0198] Step S1202: The controller switches the control coil circuit to a closed state.

[0199] For example, the controller can enable the power supply to the coil 100 and the coil drive circuit 101, so that the coil circuit switches to a closed state, so that the main circuit contacts can switch to a closed state.

[0200] Step S1203: The controller determines whether the main circuit contacts are in a closed state based on the relay status diagnostic signal.

[0201] If the relay status diagnostic signal determines that the main circuit contact is in the open state, step S1204 can be executed; if the relay status diagnostic signal determines that the main circuit contact is in the closed state, step S1205 can be executed.

[0202] Step S1204: The controller determines that the relay has a failure to close.

[0203] It should be understood that the controller can also report to the vehicle controller that a relay has a failure to close.

[0204] Step S1205: The controller determines whether there is an overcurrent fault in the relay based on the relay fault status signal.

[0205] If the relay fault status signal indicates that the relay has an overcurrent fault, then proceed to step S1206; if the relay fault status signal indicates that the relay does not have an overcurrent fault, then proceed to step S1214.

[0206] Step S1206: The controller controls the main circuit contacts to be in the open state.

[0207] For example, the controller can disconnect the power supply terminal of the coil 100 and the power supply terminal of the coil drive circuit 101, so that the coil circuit is switched to the disconnected state, so that the main circuit contacts can be switched to the disconnected state.

[0208] Step S1207: The controller determines that there is an overcurrent fault in the relay.

[0209] It should be understood that the controller can also report an overcurrent fault in the relay to the vehicle controller.

[0210] Step S1208: The controller determines whether the main circuit contacts are in the open state based on the relay status diagnostic signal.

[0211] If the relay status diagnostic signal determines that the main circuit contacts are in the open state, the detection process can be terminated; if the relay status diagnostic signal determines that the main circuit contacts are in the closed state, step S1209 can be executed.

[0212] Step S1209: The controller determines whether there is a high-voltage sampling circuit outside the relay.

[0213] If it is determined that there is no high-voltage sampling circuit outside the relay, then step S1210 is executed; if it is determined that there is a high-voltage sampling circuit outside the relay, then step S1211 is executed. The high-voltage sampling circuit can be used to detect the voltage difference between the inner and outer sides of the main circuit contacts.

[0214] Step S1210: The controller determines that the relay has a fault that it cannot disconnect.

[0215] It should be understood that the controller can also report to the vehicle controller that a relay has a failure to disconnect.

[0216] Step S1211: The controller disconnects the power supply to the relay diagnostic circuit.

[0217] For example, the controller can make the second drive circuit disconnected by controlling the level of the second enable signal to the eighth level.

[0218] Step S1212: The controller determines whether the main circuit contacts are in an open state based on the voltage difference detected by the high-voltage sampling circuit.

[0219] If the voltage difference detected by the high-voltage sampling circuit determines that the main circuit contact is in a closed state, then step S1210 is executed; if the voltage difference detected by the high-voltage sampling circuit determines that the main circuit contact is in an open state, then step S1213 is executed.

[0220] Step S1213: The controller determines that there is a fault in the relay control circuit.

[0221] Step S1214: The controller determines whether the relay needs to be disconnected.

[0222] For example, the controller can determine whether it has received a high-voltage command from the vehicle or whether the controller is faulty.

[0223] If it is determined that the relay needs to be disconnected, proceed to step S1215; if it is determined that the relay does not need to be disconnected, return to step S1205.

[0224] Step S1215: The controller controls the main circuit contacts to be in the open state.

[0225] For example, the controller can disconnect the power supply terminal of the coil 100 and the power supply terminal of the coil drive circuit 101, so that the coil circuit is switched to the disconnected state, so that the main circuit contacts can be switched to the disconnected state.

[0226] Step S1216: The controller determines whether the main circuit contacts are in the open state based on the relay status diagnostic signal.

[0227] If the relay status diagnostic signal determines that the main circuit contacts are in the open state, the detection process can be terminated; if the relay status diagnostic signal determines that the main circuit contacts are in the closed state, step S1209 can be executed.

[0228] It should be noted that the implementation methods of each step in the embodiments of this application can refer to the relevant content in the above embodiments, and will not be repeated here.

[0229] In some embodiments, Figure 13The diagram below illustrates the structure of an energy storage system provided in other embodiments of this application. Based on the above embodiments, in order to meet the relay control and diagnostics requirements of the Automotive Safety Integrity Level (ASILC), it is necessary to perform relevant diagnostics on the control output of the relay, such as short-ground and short-power supply diagnostics. In particular, it is necessary to diagnose short-circuit faults in the coil power supply and the relay diagnostic circuit power supply. This is because when these two power supplies are short-circuited, the relay will also experience an internal fault. Even if the control relay is disconnected, it may still fail to disconnect. Although it is a two-point failure, this failure still needs to be addressed for the safety objectives of ASILC. Therefore, the embodiments of this application further add a power supply diagnostic circuit, which can be used to detect the above-mentioned short-circuit faults.

[0230] like Figure 13 As shown, the energy storage system of this application embodiment further includes a power supply diagnostic circuit 5 connected to the controller 2. The power supply terminal of the power supply diagnostic circuit 5 can be connected to the detection power supply Pd; the first transmission terminal Tt1 of the power supply diagnostic circuit 5 can be connected to the power supply terminals of the first drive circuit 40 and the coil circuit 10 respectively, so that when the first drive circuit 40 is in a closed state, the electrical energy of the first power supply Ps1 can be transmitted to the power supply terminal of the coil circuit 10.

[0231] For example, the second transmission terminal Tt2 of the power supply diagnostic circuit 5 can be connected to the power supply terminals of the second drive circuit 41 and the relay diagnostic circuit 13 respectively, so that when the second drive circuit 41 is in the closed state, the power of the second power supply Ps2 can be transmitted to the power supply terminal of the relay diagnostic circuit 13.

[0232] The power supply diagnostic circuit 5 in this embodiment can be used to adjust the operating state under the control of the drive signal of the controller 2 and return a diagnostic feedback signal to the controller.

[0233] For example, the drive terminal of the power supply diagnostic circuit 5 can be connected to the drive enable terminal of the controller 2, so that the controller 2 can control the operating state of the power supply diagnostic circuit 5 by sending a drive signal to the power supply diagnostic circuit 5 through the drive enable terminal, and can return a diagnostic feedback signal to the diagnostic terminal of the controller 2 through the feedback terminal. The operating state may include, but is not limited to, whether the connection line between the power supply terminal of the power supply diagnostic circuit 5 and the detection power supply Pd is conductive. The diagnostic feedback signal can be used to indicate the voltage at the feedback terminal of the power supply diagnostic circuit 5.

[0234] Of course, the controller 2 can also control the operating status of the power supply diagnostic circuit 5 in other ways, and the power supply diagnostic circuit 5 can also return diagnostic feedback signals to the controller 2 in other ways.

[0235] The controller 2 in this embodiment can also be used to determine the power supply short-circuit condition of the coil circuit 10 and the relay diagnostic circuit 13 based on the drive signal and / or diagnostic feedback signal. The power supply short-circuit condition may include, but is not limited to, at least one of the following: short power supply fault, short ground fault, and short circuit fault between power supply terminals. It should be understood that the power supply short-circuit condition of the coil circuit 10 and the relay diagnostic circuit 13 is the same as the power supply short-circuit condition of the coil circuit 10 and the relay control circuit.

[0236] In one possible implementation, the controller 2 can determine the power supply short circuit status of the coil circuit 10 and the relay diagnostic circuit 13 based on the drive signal.

[0237] In another possible implementation, the controller 2 can determine the power supply short circuit status of the coil circuit 10 and the relay diagnostic circuit 13 based on the drive signal and the diagnostic feedback signal.

[0238] In another possible implementation, the controller 2 can determine the power supply short circuit status of the coil circuit 10 and the relay diagnostic circuit 13 based on the diagnostic feedback signal.

[0239] In summary, in this application, by setting a power supply diagnostic circuit between the controller and the relay, the controller determines the power supply short circuit status of the coil circuit and the relay diagnostic circuit based on the drive signal sent to the power supply diagnostic circuit and / or the diagnostic feedback signal returned by the power supply diagnostic circuit. This allows for the timely execution of corresponding second preset protection measures when a power supply short circuit is detected, thereby meeting the relay control and diagnosis requirements of ASILC and improving the stability of the relay and / or electrical equipment.

[0240] In some embodiments, Figure 14 The diagram below shows the structure of an energy storage system provided in some other embodiments of this application. Based on the above embodiments, the first drive terminal of the power supply diagnostic circuit 5 in this application embodiment can be connected to the first drive enable terminal of the controller 2 so that the controller 2 can send a first drive signal to the first drive terminal of the power supply diagnostic circuit 5 through the first drive enable terminal to control whether the connection line between the detection power supply Pd and the first power supply terminal of the power supply diagnostic circuit 5 is conductive.

[0241] It should be understood that, by default, controller 2 will prevent the connection between the detection power supply Pd and the first power supply terminal of the power supply diagnostic circuit 5 from being open. It will only open the connection between the detection power supply Pd and the first power supply terminal of the power supply diagnostic circuit 5 when there is a short circuit in the power supply of the detection coil circuit.

[0242] It should be noted that when the connection line between the detection power supply Pd and the first power supply terminal of the power supply diagnostic circuit 5 is not conductive, the voltage of the first drive signal at the first drive enable terminal should theoretically be less than the first preset voltage. The first preset voltage is very small; for example, it can be close to 0V.

[0243] In this embodiment, the second drive terminal of the power supply diagnostic circuit 5 can be connected to the second drive enable terminal of the controller 2, so that the controller 2 can send a second drive signal to the second drive terminal of the power supply diagnostic circuit 5 through the second drive enable terminal to control whether the connection line between the detection power supply Pd and the second power supply terminal of the power supply diagnostic circuit 5 is conductive.

[0244] It should be understood that, by default, controller 2 will prevent the connection between the detection power supply Pd and the second power supply terminal of the power supply diagnostic circuit 5 from being open. It will only open the connection between the detection power supply Pd and the second power supply terminal of the power supply diagnostic circuit 5 when a short circuit in the power supply of the relay diagnostic circuit needs to be detected.

[0245] It should be noted that, in the event that the connection between the detection power supply Pd and the second power supply terminal of the power supply diagnostic circuit 5 is not conductive, the voltage of the second drive signal at the second drive enable terminal should theoretically be lower than the first preset voltage. The supply voltage of the second power supply and the supply voltage of the first power supply can be the same.

[0246] The controller 2 in this embodiment can be specifically used to: determine that there is a short power supply fault in the coil circuit 10 or the relay diagnostic circuit 13 if the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal is not less than the first preset voltage.

[0247] In one possible implementation, considering that the controller 2, in its default state, will prevent the connection between the detection power supply Pd and the first power supply terminal of the power supply diagnostic circuit 5 from being conductive, meaning that the voltage of the first drive signal at the first drive enable terminal should theoretically be less than the first preset voltage, if the voltage of the first drive signal at the first drive enable terminal is not less than the first preset voltage, then the controller 2 can determine that there is a short power supply fault in the coil circuit 10. Here, a short power supply fault in the coil circuit 10 can refer to a short circuit between the power supply terminal of the coil circuit 10 and the first power supply.

[0248] In another possible implementation, considering that the controller 2, in its default state, will prevent the connection between the detection power supply Pd and the second power supply terminal of the power supply diagnostic circuit 5 from being conductive, meaning that the voltage of the second drive signal at the second drive enable terminal should theoretically be less than the first preset voltage, if the voltage of the second drive signal at the second drive enable terminal is not less than the first preset voltage, then the controller 2 can determine that the relay diagnostic circuit 13 has a short power supply fault. Here, a short power supply fault in the relay diagnostic circuit 13 can refer to a short circuit between the power supply terminal of the relay diagnostic circuit 13 and the second power supply.

[0249] In summary, in the embodiments of this application, the controller can quickly and accurately determine whether there is a short power supply fault in the coil circuit or the relay diagnostic circuit by using the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal.

[0250] In some embodiments, Figure 15 This is a schematic diagram of the structure of an energy storage system provided in other embodiments of this application. Based on the above embodiments, such as... Figure 15 As shown, the power supply diagnostic circuit 5 in this embodiment may include a first diagnostic branch 50 and a second diagnostic branch 51. The first return test terminal of the first diagnostic branch 50 may be connected to the first diagnostic terminal of the controller 2, and the second return test terminal of the second diagnostic branch 51 may be connected to the second diagnostic terminal of the controller 2.

[0251] The controller 2 in this embodiment can also be used to: if the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal is less than the first preset voltage, control the target diagnostic branch in the power supply diagnostic circuit 5 to adjust its operating state through the target drive signal at the target drive enable terminal, so that the connection line between the target power supply terminal of the target diagnostic branch and the detection power supply Pd is connected. Here, the target drive enable terminal is either the first drive enable terminal or the second drive enable terminal, and correspondingly, the target diagnostic branch is either the first diagnostic branch 50 or the second diagnostic branch 51.

[0252] In one possible implementation, if the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal are both less than the first preset voltage, that is, there is no short power supply fault in the coil circuit or the relay diagnostic circuit, the controller 2 can send a first drive signal to the first drive terminal of the first diagnostic branch 50 through the first drive enable terminal to control the first diagnostic branch 50 in the power supply diagnostic circuit 5 to adjust its operating state, so that the connection line between the first power supply terminal of the first diagnostic branch 50 and the detection power supply Pd is connected.

[0253] In another possible implementation, if the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal is less than the first preset voltage, that is, there is no short power supply fault in the coil circuit or the relay diagnostic circuit, the controller 2 can send a second drive signal to the second drive terminal of the second diagnostic branch 51 through the second drive enable terminal to control the second diagnostic branch 51 in the power supply diagnostic circuit 5 to adjust its operating state, so that the connection line between the second power supply terminal of the second diagnostic branch 51 and the detection power supply Pd is connected.

[0254] Correspondingly, the power supply diagnostic circuit 5 in this embodiment can be specifically used to: return a target diagnostic feedback signal to the controller 2 through the target feedback terminal. The target feedback terminal can be a first feedback terminal or a second feedback terminal; the target diagnostic feedback signal can be used to indicate the voltage of the target feedback terminal.

[0255] It should be noted that, when the connection between the target power supply terminal and the detection power supply Pd in ​​the target diagnostic branch is conductive, the voltage at the target return terminal should theoretically be greater than the second preset voltage. This second preset voltage is related to the detection voltage of the detection power supply Pd. For example, the second preset voltage can be less than the voltage division of the detection voltage of the detection power supply Pd at the target return terminal. For instance, the second preset voltage can be slightly less than the voltage division of the detection voltage at the target return terminal.

[0256] In one possible implementation, when the target diagnostic branch is the first diagnostic branch 50, the first return terminal of the first diagnostic branch 50 can return a first diagnostic return signal to the controller 2, wherein the first diagnostic return signal can be used to indicate the voltage of the first return terminal.

[0257] In another possible implementation, when the target diagnostic branch is the second diagnostic branch 51, the second return terminal of the second diagnostic branch 51 can return a second diagnostic return signal to the controller 2, wherein the second diagnostic return signal can be used to indicate the voltage of the second return terminal.

[0258] Furthermore, the controller 2 in this embodiment can also be used to: determine that there is a short-to-ground fault in the coil circuit or relay diagnostic circuit if the voltage of the target diagnostic feedback signal is not greater than the second preset voltage.

[0259] In this embodiment, considering that the connection line between the target power supply terminal and the detection power supply Pd in ​​the target diagnostic branch is conductive, the voltage at the target return detection terminal should theoretically be greater than the second preset voltage. Therefore, if the voltage of the target diagnostic return detection signal is not greater than the second preset voltage, the controller 2 can determine that there is a short-to-ground fault in the coil circuit or relay diagnostic circuit connected to the target diagnostic branch. A short-to-ground fault in the coil circuit can refer to a short circuit between the power supply terminal of the coil circuit and ground, and a short-to-ground fault in the relay diagnostic circuit can refer to a short circuit between the power supply terminal of the relay diagnostic circuit and ground.

[0260] In one possible implementation, if the voltage of the first diagnostic feedback signal is not greater than the second preset voltage, the controller 2 can determine that there is a short-to-ground fault in the coil circuit connected to the first diagnostic branch 50 when the target diagnostic branch is the first diagnostic branch 50.

[0261] In another possible implementation, if the target diagnostic branch is the second diagnostic branch 51, and the voltage of the second diagnostic feedback signal is not greater than the second preset voltage, the controller 2 can determine that there is a short-to-ground fault in the relay diagnostic circuit connected to the second diagnostic branch 51.

[0262] In summary, in this embodiment, the controller uses the target drive signal at the target drive enable terminal to control the target diagnostic branch in the power supply diagnostic circuit to adjust its operating state, so that the power supply diagnostic circuit returns a target diagnostic feedback signal to the controller through the target feedback terminal. Furthermore, if the voltage of the target diagnostic feedback signal is not greater than a second preset voltage, the controller can determine that a short-to-ground fault exists in the coil circuit or relay diagnostic circuit. Therefore, in this embodiment, the controller, by combining the target drive signal and the target diagnostic feedback signal, can quickly and accurately determine whether a short-to-ground fault exists in the coil circuit or relay diagnostic circuit.

[0263] In some embodiments, the controller 2 of this application embodiment can also be used to: if the voltage of the target diagnostic feedback signal is greater than the second preset voltage, and the voltage of the diagnostic feedback signal of other diagnostic branches in the power supply diagnostic circuit 5 other than the target diagnostic branch is not less than the first preset voltage, then it can be determined that there is a short circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit.

[0264] It should be noted that, in this embodiment of the application, considering that the connection line between the power supply terminal of the diagnostic branch other than the target diagnostic branch in the power supply diagnostic circuit 5 and the detection power supply Pd is not conductive, the voltage of the diagnostic feedback signal of the other diagnostic branches should theoretically be less than the first preset voltage.

[0265] In this embodiment, if the voltage of the target diagnostic feedback signal is greater than the second preset voltage, that is, there is no short-ground fault in the coil circuit or relay diagnostic circuit connected to the target diagnostic branch, and the voltage of the diagnostic feedback signal of the other diagnostic branches in the power supply diagnostic circuit 5 other than the target diagnostic branch is not less than the first preset voltage, since the short-ground fault and short power supply fault have been eliminated, the controller 2 can determine that there is a short-circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit.

[0266] As can be seen, in this embodiment of the application, the controller can quickly and accurately determine whether there is a short circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit by combining the target drive signal, the target diagnostic feedback signal and the diagnostic feedback signals of other diagnostic branches.

[0267] In some embodiments, Figure 16 This is a schematic diagram of the structure of an energy storage system provided in other embodiments of this application. Based on the above embodiments, this application uses a relay including a relay diagnostic circuit 13 and a coil circuit 10 as an example to provide an exemplary description of the relevant contents of the first diagnostic branch 50 and the second diagnostic branch 51. Figure 16 As shown, the first diagnostic branch 50 in this embodiment may include a first diagnostic switch K1, a first pull-up resistor Ru1, a first pull-down resistor Rd1, and a second pull-down resistor Rd2 connected in series with the detection power supply Pd.

[0268] For example, the driving terminal of the first diagnostic switch K1 (or the first driving terminal of the power supply diagnostic circuit 5) can be connected to the first driving enable terminal of the controller 2, the connection point between the first pull-up resistor Ru1 and the first pull-down resistor Rd1 (or the first transmission terminal of the power supply diagnostic circuit 5) can be connected to the power supply terminals of the first driving circuit 40 and the coil circuit 10 respectively, and the connection point between the first pull-down resistor Rd1 and the second pull-down resistor Rd2 (or the first return detection terminal of the first diagnostic branch 50) can be connected to the first diagnostic terminal of the controller 2.

[0269] It should be understood that Figure 16 The example shown uses GPIO6 as the first drive enable terminal and ADC3 as the first diagnostic terminal. Of course, the first drive enable terminal or the first diagnostic terminal can also be other ports in the controller, and this application does not limit this.

[0270] As can be seen, in this embodiment, the power supply terminal of the coil circuit 10 can be connected to the detection power supply Pd through the first pull-up resistor Ru1 and the first diagnostic switch K1. The power supply terminal of the coil circuit 10 can also be connected to ground GND through the first pull-down resistor Rd1 and the second pull-down resistor Rd2 connected in series. The drive terminal of the first diagnostic switch K1 can be connected to the GPIO6 port of the controller 2, so that the GPIO6 port of the controller 2 can output a first drive signal to control the opening and closing state of the first diagnostic switch K1. The connection point between the first pull-down resistor Rd1 and the second pull-down resistor Rd2 can be connected to the ADC3 port of the controller 2, so that a first diagnostic feedback signal can be sent to the controller 2.

[0271] In this embodiment, the second diagnostic branch 51 may include a second diagnostic switch K2, a second pull-up resistor Ru2, a third pull-down resistor Rd3, and a fourth pull-down resistor Rd4 connected in series with the detection power supply Pd.

[0272] For example, the driving terminal of the second diagnostic switch K2 (or the second driving terminal of the power supply diagnostic circuit 5) can be connected to the second driving enable terminal of the controller 2, the connection point between the second pull-up resistor Ru2 and the third pull-down resistor Rd3 (or the second transmission terminal of the power supply diagnostic circuit 5) can be connected to the power supply terminals of the second driving circuit 41 and the relay diagnostic circuit 13 respectively, and the connection point between the third pull-down resistor Rd3 and the fourth pull-down resistor Rd (or the second feedback terminal of the first diagnostic branch 51) can be connected to the second diagnostic terminal of the controller 2.

[0273] It should be understood that Figure 16 The example shown uses GPIO7 as the second drive enable terminal and ADC4 as the second diagnostic terminal. Of course, the second drive enable terminal or the second diagnostic terminal can also be other ports in the controller, and this application embodiment does not limit this.

[0274] As can be seen, in this embodiment, the power supply terminal of the relay diagnostic circuit 13 can be connected to the detection power supply Pd via the second pull-up resistor Ru2 and the second diagnostic switch K2. The power supply terminal of the relay diagnostic circuit 13 can also be connected to GND via a third pull-down resistor Rd3 and a fourth pull-down resistor Rd4 connected in series. The drive terminal of the second diagnostic switch K2 can be connected to port GPIO7 of the controller 2, so that port GPIO7 of the controller 2 can output a second drive signal to control the opening and closing state of the second diagnostic switch K2. The connection point between the third pull-down resistor Rd3 and the fourth pull-down resistor Rd4 can be connected to port ADC4 of the controller 2, so that a second diagnostic feedback signal can be sent to the controller 2.

[0275] In some embodiments, Figure 17The following is a flowchart illustrating a power supply short-circuit detection method for an energy storage system provided in some embodiments of this application. Based on the above embodiments, and for ease of understanding, the following embodiments of this application incorporate... Figure 16 The energy storage system shown illustrates an exemplary method for detecting power supply short circuits in energy storage systems. For example... Figure 17 As shown, the method in this application embodiment may include the following steps:

[0276] Step S1701: The controller is powered on at low voltage.

[0277] Step S1702: The controller reads back the first drive signal of the first drive enable terminal and the second drive signal of the second drive enable terminal.

[0278] Step S1703: The controller determines whether the voltage of the first drive signal and the voltage of the second drive signal are both less than the first preset voltage.

[0279] If the voltage of the first driving signal or the voltage of the second driving signal is not less than the first preset voltage, then step S1704 is executed; if the voltage of the first driving signal and the voltage of the second driving signal are both less than the first preset voltage, then step S1705 is executed.

[0280] Step S1704: The controller determines that there is a short power supply fault in the coil circuit or relay diagnostic circuit.

[0281] Step S1705: The controller controls the second diagnostic switch K2 to be in the closed state.

[0282] For example, the controller can send a second drive signal to the drive terminal of the second diagnostic switch K2 through the second drive enable terminal to control the second diagnostic switch K2 to be in the closed state.

[0283] Step S1706: The controller determines whether the voltage of the second diagnostic feedback signal is greater than the second preset voltage.

[0284] If the voltage of the second diagnostic return signal is not greater than the second preset voltage, then step S1707 is executed; if the voltage of the second diagnostic return signal is greater than the second preset voltage, then step S1708 is executed.

[0285] Step S1707: The controller determines that there is a short-to-ground fault in the relay diagnostic circuit.

[0286] Step S1708: The controller controls the second diagnostic switch K2 to be in the open state and controls the first diagnostic switch K1 to be in the closed state.

[0287] For example, the controller can send a first drive signal to the drive terminal of the first diagnostic switch K1 through the first drive enable terminal to control the first diagnostic switch K1 to be in a closed state.

[0288] For example, the controller can control the second diagnostic switch K2 to be in the off state by not sending the second drive signal to the drive terminal of the second diagnostic switch K2 through the second drive enable terminal; of course, the controller can also control the second diagnostic switch K2 to be in the off state in other ways.

[0289] Step S1709: The controller determines whether the voltage of the first diagnostic feedback signal is greater than the second preset voltage.

[0290] If the voltage of the first diagnostic return signal is not greater than the second preset voltage, then step S1710 is executed; if the voltage of the first diagnostic return signal is greater than the second preset voltage, then step S1711 is executed.

[0291] Step S1710: The controller determines that there is a short-to-ground fault in the coil circuit.

[0292] Step S1711: The controller determines whether the voltage of the second diagnostic feedback signal is less than the first preset voltage.

[0293] If the voltage of the second diagnostic return signal is not less than the first preset voltage, then step S1712 is executed; if the voltage of the second diagnostic return signal is less than the first preset voltage, then step S1713 is executed.

[0294] Step S1712: The controller determines that there is a short circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit.

[0295] Step S1713: The controller controls the first diagnostic switch K1 to be in the off state.

[0296] For example, the controller can control the first diagnostic switch K1 to be in the off state by not sending the first drive signal to the drive terminal of the first diagnostic switch K1 through the first drive enable terminal; of course, the controller can also control the first diagnostic switch K1 to be in the off state in other ways.

[0297] Step S1714: The controller power supply short circuit detection is passed, and the high voltage process is about to be executed.

[0298] In this embodiment, after the controller is powered on at low voltage, it begins to execute the aforementioned power supply short-circuit detection process. Only after the power supply short-circuit detection passes can the controller control the relay to apply high voltage, thereby further protecting the relay and / or the electrical equipment.

[0299] The implementation methods of each step in the embodiments of this application can be referred to the relevant content in the above embodiments, and will not be repeated here.

[0300] In some embodiments, Figure 18This is a flowchart illustrating a relay control method provided in some embodiments of this application. The methods of this application can be applied to the relays in the above embodiments of this application. The possible implementation methods of the relays can be referred to the relevant content in the above embodiments, and will not be repeated here. Figure 18 As shown, the method in this application embodiment may include the following steps:

[0301] Step S1801: The detection component in the relay collects the current of the main circuit where the main circuit contact is located and sends the current of the main circuit to the relay diagnostic circuit.

[0302] Step S1802: When the current in the main circuit is greater than the preset current, the relay diagnostic circuit controls the coil circuit in the relay to switch to the open state, so as to control the main circuit contacts to switch to the open state.

[0303] In some embodiments, the relay further includes an auxiliary contact connected to the main circuit contact, the output terminal of the auxiliary contact being connected to a relay diagnostic circuit; the method further includes:

[0304] The auxiliary contact sends a status diagnostic signal to the relay diagnostic circuit; the status diagnostic signal of the auxiliary contact is used to indicate the open and closed state of the auxiliary contact.

[0305] The relay diagnostic circuit determines the opening and closing status of the auxiliary contacts based on the status diagnostic signal; the opening and closing status of the auxiliary contacts is used to indicate the opening and closing status of the main circuit contacts.

[0306] In some embodiments, the auxiliary contact is a mirror image of the main circuit contact; when the main circuit contact is in an open state, the auxiliary contact is in a closed state; when the main circuit contact is in a closed state, the auxiliary contact is in an open state.

[0307] In some embodiments, the output of the relay diagnostic circuit is also connected to the controller; the method further includes:

[0308] The relay diagnostic circuit outputs a relay status diagnostic signal to the controller based on the opening and closing status of the auxiliary contacts. The relay status diagnostic signal is used to indicate the opening and closing status of the main circuit contacts.

[0309] In some embodiments, the relay diagnostic circuit includes: an auxiliary contact diagnostic module, wherein the input terminal of the auxiliary contact diagnostic module is connected to the output terminal of the auxiliary contact, and the output terminal of the auxiliary contact diagnostic module is connected to a controller; the method further includes:

[0310] The auxiliary contact diagnostic module outputs relay status diagnostic signals to the controller based on the open and closed states of the auxiliary contacts.

[0311] In some embodiments, the output of the relay diagnostic circuit is also connected to the controller; the method further includes:

[0312] The relay diagnostic circuit outputs a relay fault status signal to the controller based on the current in the main circuit. The relay fault status signal is used to indicate whether there is an overcurrent condition in the relay.

[0313] In some embodiments, the relay diagnostic circuit includes: an overcurrent diagnostic module and a fault handling module; wherein, the input terminal of the overcurrent diagnostic module is connected to the output terminal of the current detection component, the output terminal of the overcurrent diagnostic module is connected to the input terminal of the fault handling module, the first output terminal of the fault handling module is connected to the coil circuit, and the second output terminal of the fault handling module is connected to the controller; the method further includes:

[0314] When the current in the main circuit exceeds the preset current, the overcurrent diagnosis module sends an overcurrent diagnosis signal to the fault handling module.

[0315] The fault handling module controls the coil circuit to switch to the open state based on the overcurrent diagnostic signal and outputs a relay fault status signal to the controller.

[0316] The relevant content of the relay control method provided in the embodiments of this application can be referred to the technical solutions in the relay embodiments of the above application. The implementation principle and technical effect are similar, and will not be repeated here.

[0317] In some embodiments, Figure 19 This is a flowchart illustrating a control method for an energy storage system provided in some embodiments of this application. The methods in these embodiments can be applied to the energy storage systems described above. The possible implementation methods of the energy storage system can be found in the relevant content of the above embodiments, and will not be repeated here. Figure 19 As shown, the method in this application embodiment may include the following steps:

[0318] Step S1901: The processor acquires the relay status diagnostic signal and relay fault status signal sent by the relay diagnostic circuit in the energy storage system.

[0319] Among them, the relay status diagnostic signal is used to indicate the opening and closing status of the main circuit contacts of the relay in the energy storage system, and the relay fault status signal is used to indicate whether there is an overcurrent in the relay.

[0320] Step S1902: The processor determines whether the relay is faulty based on the relay fault status signal and / or relay status diagnostic signal.

[0321] In some embodiments, the processor determines whether a relay is faulty based on a relay fault status signal and / or a relay status diagnostic signal, which may include:

[0322] If the relay status diagnostic signal indicates that the main circuit contacts are open when the main circuit contacts are in the closed state, then the relay is determined to have a failure to close.

[0323] In some embodiments, the processor determines whether a relay is faulty based on a relay fault status signal and / or a relay status diagnostic signal, which may include:

[0324] If the relay fault status signal is used to indicate that the relay has an overcurrent condition, then it is determined that the relay has an overcurrent fault or the relay control circuit has a fault.

[0325] In some embodiments, if the relay status diagnostic signal is used to indicate that the main circuit contacts are in a closed state, the method further includes:

[0326] The controller keeps the main circuit contacts in the open state.

[0327] In some embodiments, the processor determines whether a relay is faulty based on a relay fault status signal and / or a relay status diagnostic signal, which may include:

[0328] If the main circuit contacts in the control relay are in the open state, and the relay status diagnostic signal indicates that the main circuit contacts are in the closed state, then it is determined that the relay has a failure to disconnect or a relay control circuit failure.

[0329] In some embodiments, the energy storage system further includes: a high-voltage sampling circuit connected to the controller; the method further includes:

[0330] The high-voltage sampling circuit detects the voltage difference between the outer and inner sides of the main circuit contacts and sends the voltage difference to the controller;

[0331] The controller determines the opening and closing state of the main circuit contacts based on the voltage difference;

[0332] If the voltage difference indicator main circuit contact is in the open state, the controller determines that there is a fault in the relay control circuit; if the voltage difference indicator main circuit contact is in the closed state, the controller determines that the relay has a fault that it cannot disconnect.

[0333] In some embodiments, the energy storage system further includes a drive circuit, wherein the power enable terminal of the controller is connected to the power supply terminal of the relay through the drive circuit; the method further includes:

[0334] The controller controls the opening and closing state of the drive circuit to control whether the power supply provides power to the relay's power supply terminal.

[0335] In some embodiments, the driving circuit includes a first driving circuit and a second driving circuit, the power supply includes a first power supply and a second power supply, and the power supply terminal of the coil circuit in the relay is connected to the first power supply enable terminal of the controller and the first power supply through the first driving circuit.

[0336] The power supply terminal of the relay diagnostic circuit in the relay is connected to the second power supply enable terminal and the second power supply of the controller through the second drive circuit.

[0337] The controller controls the opening and closing state of the drive circuit to control whether the power supply supplies power to the relay's power supply terminal, and may include:

[0338] The opening and closing state of the first driving circuit is controlled to control whether the first power supply supplies power to the coil circuit, and the opening and closing state of the second driving circuit is controlled to control whether the second power supply supplies power to the relay diagnostic circuit.

[0339] In some embodiments, the energy storage system further includes: a power supply diagnostic circuit connected to the controller, wherein the power supply terminal of the power supply diagnostic circuit is connected to a detection power supply, the first transmission terminal of the power supply diagnostic circuit is connected to the power supply terminals of the first drive circuit and the coil circuit respectively, and the second transmission terminal of the power supply diagnostic circuit is connected to the power supply terminals of the second drive circuit and the relay diagnostic circuit respectively; the method further includes:

[0340] The power supply diagnostic circuit adjusts its operating status under the control of the controller's drive signal and returns a diagnostic feedback signal to the controller.

[0341] The controller determines the power supply short circuit status of the coil circuit and relay diagnostic circuit based on the drive signal and / or diagnostic feedback signal.

[0342] In some embodiments, the first driving terminal of the power supply diagnostic circuit is connected to the first driving enable terminal of the controller, and the second driving terminal of the power supply diagnostic circuit is connected to the second driving enable terminal of the controller.

[0343] The controller determines the power supply short-circuit status of the coil circuit and relay diagnostic circuit based on the drive signal and / or diagnostic feedback signal, which may include:

[0344] If the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal is not less than the first preset voltage, then it is determined that there is a short power supply fault in the coil circuit or the relay diagnostic circuit.

[0345] In some embodiments, the power supply diagnostic circuit includes a first diagnostic branch and a second diagnostic branch, wherein a first return-check terminal of the first diagnostic branch is connected to a first diagnostic terminal of the controller, and a second return-check terminal of the second diagnostic branch is connected to a second diagnostic terminal of the controller; determining the power supply short-circuit condition of the coil circuit and the relay diagnostic circuit based on the drive signal and / or the diagnostic return-check signal may include:

[0346] If the voltage of the first drive signal at the first drive enable terminal or the voltage of the second drive signal at the second drive enable terminal is less than the first preset voltage, the controller controls the target diagnostic branch in the power supply diagnostic circuit to adjust the operating state through the target drive signal at the target drive enable terminal; wherein, the target drive enable terminal is the first drive enable terminal or the second drive enable terminal, and the corresponding target diagnostic branch is the first diagnostic branch or the second diagnostic branch.

[0347] The power supply diagnostic circuit returns a target diagnostic feedback signal to the controller through the target feedback terminal; wherein, the target feedback terminal is either the first feedback terminal or the second feedback terminal; the target diagnostic feedback signal is used to indicate the voltage of the target feedback terminal;

[0348] If the voltage of the target diagnostic feedback signal is not greater than the second preset voltage, the controller determines that there is a short-to-ground fault in the coil circuit or the relay diagnostic circuit.

[0349] In some embodiments, the method further includes:

[0350] If the voltage of the target diagnostic feedback signal is greater than the second preset voltage, and the voltage of the diagnostic feedback signal of other diagnostic branches in the power supply diagnostic circuit (excluding the target diagnostic branch) is not less than the first preset voltage, then the controller determines that there is a short circuit fault between the power supply terminal of the coil circuit and the power supply terminal of the relay diagnostic circuit.

[0351] In some embodiments, the first diagnostic branch includes a first diagnostic switch, a first pull-up resistor, a first pull-down resistor, and a second pull-down resistor connected in series with the detection power supply;

[0352] The drive terminal of the first diagnostic switch is connected to the first drive enable terminal of the controller. The connection point between the first pull-up resistor and the first pull-down resistor is connected to the power supply terminal of the first drive circuit and the coil circuit, respectively. The connection point between the first pull-down resistor and the second pull-down resistor is connected to the first diagnostic terminal of the controller.

[0353] In some embodiments, the second diagnostic branch includes a second diagnostic switch, a second pull-up resistor, a third pull-down resistor, and a fourth pull-down resistor connected in series with the detection power supply;

[0354] The drive terminal of the second diagnostic switch is connected to the second drive enable terminal of the controller. The connection point between the second pull-up resistor and the third pull-down resistor is connected to the power supply terminals of the second drive circuit and the relay diagnostic circuit, respectively. The connection point between the third pull-down resistor and the fourth pull-down resistor is connected to the second diagnostic terminal of the controller.

[0355] The relevant content of the control method of the energy storage system provided in the embodiments of this application can be referred to the technical solutions in the above-mentioned energy storage system embodiments of this application. The implementation principle and technical effect are similar, and will not be repeated here.

[0356] In some embodiments, this application provides an electrical device that may include the energy storage system provided in the above embodiments of this application. The implementation principle and technical effects are similar, and will not be repeated here.

[0357] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0358] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A relay characterized by comprising: The relay comprises a coil circuit, main circuit contact, current detection component and relay diagnosis circuit inside the relay, the output end of the current detection component is connected with the input end of the relay diagnosis circuit, and the output end of the relay diagnosis circuit is connected with the controller in the coil circuit and energy storage system respectively; The current detection component is used for collecting the current of the main circuit where the main circuit contact is located and sending the current of the main circuit to the relay diagnosis circuit; The relay diagnosis circuit is used for controlling the coil circuit to switch to the open state in the case that the current of the main circuit is greater than the preset current, controlling the main circuit contact to switch to the open state, and outputting a relay fault state signal to the controller based on the current of the main circuit, wherein the relay fault state signal is used for indicating whether there is an overcurrent condition in the relay; The relay diagnosis circuit comprises an overcurrent diagnosis module and a fault processing module, wherein the input end of the overcurrent diagnosis module is connected with the output end of the current detection component, the output end of the overcurrent diagnosis module is connected with the input end of the fault processing module, and the output end of the fault processing module is connected with the coil circuit and the controller respectively; The overcurrent diagnosis module is used for sending an overcurrent diagnosis signal to the fault processing module in the case that the current of the main circuit is greater than the preset current; The fault processing module is used for controlling the coil circuit to switch to the open state according to the overcurrent diagnosis signal and outputting the relay fault state signal to the controller; The relay further comprises an auxiliary contact inside the relay and connected with the main circuit contact, and the output end of the auxiliary contact is connected with the input end of the relay diagnosis circuit; The auxiliary contact is used for sending a state diagnosis signal of the auxiliary contact to the relay diagnosis circuit, wherein the state diagnosis signal of the auxiliary contact is used for indicating the opening and closing state of the auxiliary contact; The relay diagnosis circuit is further used for determining the opening and closing state of the auxiliary contact according to the state diagnosis signal and outputting a relay state diagnosis signal to the controller based on the opening and closing state of the auxiliary contact, wherein the opening and closing state of the auxiliary contact is used for indicating the opening and closing state of the main circuit contact, and the relay state diagnosis signal is used for indicating the opening and closing state of the main circuit contact; The auxiliary contact is a mirror contact of the main circuit contact, in the case that the main circuit contact is in the open state, the auxiliary contact is in the closed state, and in the case that the main circuit contact is in the closed state, the auxiliary contact is in the open state.

2. The relay according to claim 1, characterized in that The relay diagnosis circuit comprises an auxiliary contact diagnosis module, wherein the input end of the auxiliary contact diagnosis module is connected with the output end of the auxiliary contact, and the output end of the auxiliary contact diagnosis module is connected with the controller; The auxiliary contact diagnosis module is used for outputting the relay state diagnosis signal to the controller based on the opening and closing state of the auxiliary contact.

3. An energy storage system characterized by, The energy storage system comprises the relay according to any one of claims 1-2, and a controller connected with the relay; wherein the controller is used for: acquiring a relay fault state signal sent by a relay diagnosis circuit in the relay; wherein the relay fault state signal is used for indicating whether there is an overcurrent situation in the relay; determining whether there is a fault in the relay according to the relay fault state signal.

4. The energy storage system of claim 3, wherein, The controller is specifically used for: if the relay fault state signal is used for indicating that there is an overcurrent situation in the relay, determining that there is an overcurrent fault in the relay or a control loop fault in the relay.

5. The energy storage system of claim 4, wherein, The controller is further used for: acquiring a relay state diagnosis signal sent by a relay diagnosis circuit in the relay; wherein the relay state diagnosis signal is used for indicating an opening and closing state of a main loop contact in the relay; determining whether there is a fault in the relay according to the relay state diagnosis signal.

6. The energy storage system of claim 5, wherein, The controller is specifically used for: in a case of controlling the main loop contact in a closed state, if the relay state diagnosis signal is used for indicating that the main loop contact is in an open state, determining that there is a failure to close in the relay.

7. The energy storage system of claim 5, wherein, The controller is specifically used for: in a case of controlling the main loop contact in the relay in an open state, if the relay state diagnosis signal is used for indicating that the main loop contact is in a closed state, determining that there is a failure to open in the relay or a control loop fault in the relay.

8. The energy storage system of claim 7, wherein, The energy storage system further comprises a high-voltage sampling loop connected with the controller; The high-voltage sampling loop is used for detecting a voltage difference between the outside and the inside of the main loop contact, and sending the voltage difference to the controller; The controller is further used for: determining the opening and closing state of the main loop contact according to the voltage difference; if the voltage difference indicates that the main loop contact is in an open state, determining that there is a fault in the relay control loop; if the voltage difference indicates that the main loop contact is in a closed state, determining that there is a failure to open in the relay.

9. The energy storage system of any one of claims 3-8, wherein, if there is an overcurrent fault in the relay or a control loop fault in the relay, and the relay state diagnosis signal is used for indicating that the main loop contact is in a closed state, the controller is further used for: controlling the main loop contact in an open state.

10. The energy storage system of any one of claims 3-8, wherein, The energy storage system further comprises a drive circuit and a power supply diagnosis circuit; wherein a drive enable end of the controller is connected with a drive end of the power supply diagnosis circuit, a power supply enable end of the controller is connected with a power supply end of the relay through a transmission end of the drive circuit and the power supply diagnosis circuit, and a back-check end of the power supply diagnosis circuit is connected with a diagnosis end of the controller; wherein the controller is further used for: sending a drive signal to the power supply diagnosis circuit through the drive enable end; The power supply diagnosis circuit is used for adjusting an operating state according to the drive signal, and returning a diagnosis back-check signal to the controller through the back-check end; The controller is further used for: determining a power supply short circuit situation of the relay according to the drive signal and / or the diagnosis back-check signal.

11. The energy storage system of claim 10, wherein, If the relay includes a coil loop and a relay diagnosis circuit, the drive circuit includes a first drive circuit and a second drive circuit, and the first power supply enable end of the controller is connected with the power supply end of the coil loop through the first drive circuit and the first transmission end of the power supply diagnosis circuit; the second power supply enable end of the controller is connected with the power supply end of the relay diagnosis circuit through the second drive circuit and the second transmission end of the power supply diagnosis circuit; the first drive enable end of the controller is connected with the first drive end of the power supply diagnosis circuit, and the second drive enable end of the controller is connected with the second drive end of the power supply diagnosis circuit; the controller is specifically configured to: if the voltage of the first drive signal of the first drive enable end or the voltage of the second drive signal of the second drive enable end is not less than a first preset voltage, it is determined that the coil loop or the relay diagnosis circuit has a short power supply fault.

12. The energy storage system of claim 11, wherein, the power supply diagnosis circuit includes a first diagnosis branch and a second diagnosis branch, the first back check end of the first diagnosis branch is connected with the first diagnosis end of the controller, and the second back check end of the second diagnosis branch is connected with the second diagnosis end of the controller; the controller is further configured to: if the voltage of the first drive signal of the first drive enable end and the voltage of the second drive signal of the second drive enable end are both less than the first preset voltage, a target drive signal is sent to the power supply diagnosis circuit through a target drive enable end; wherein the target drive enable end is the first drive enable end or the second drive enable end; the power supply diagnosis circuit is specifically configured to: adjust the operating state of a target diagnosis branch in the power supply diagnosis circuit according to the target drive signal, and return a target diagnosis back check signal to the controller through a target back check end; wherein the target diagnosis branch is the first diagnosis branch or the second diagnosis branch, the target back check end is the first back check end or the second back check end, and the target diagnosis back check signal is used to indicate the voltage of the target back check end; the controller is further configured to: if the voltage of the target diagnosis back check signal is not greater than a second preset voltage, it is determined that the coil loop or the relay diagnosis circuit has a short ground fault.

13. The energy storage system of claim 12, wherein, the controller is further configured to: if the voltage of the target diagnosis back check signal is greater than the second preset voltage, and the voltage of the diagnosis back check signal of the diagnosis branch other than the target diagnosis branch in the power supply diagnosis circuit is not less than the first preset voltage, it is determined that there is a short circuit fault between the power supply end of the coil loop and the power supply end of the relay diagnosis circuit.

14. The energy storage system of claim 13, wherein, the first diagnosis branch includes a first diagnosis switch connected in series with a detection power supply, a first pull-up resistor, a first pull-down resistor and a second pull-down resistor; the drive end of the first diagnosis switch is connected with the first drive enable end of the controller, the connection point between the first pull-up resistor and the first pull-down resistor is connected with the power supply end of the first drive circuit and the coil loop respectively, and the connection point between the first pull-down resistor and the second pull-down resistor is connected with the first diagnosis end of the controller.

15. The energy storage system of claim 13, wherein, The second diagnosis branch comprises a second diagnosis switch connected in series with a detection power supply, a second pull-up resistor, a third pull-down resistor and a fourth pull-down resistor; The driving end of the second diagnosis switch is connected with the second driving enable end of the controller, the connection point between the second pull-up resistor and the third pull-down resistor is connected with the power supply end of the second driving circuit and the relay diagnosis circuit respectively, and the connection point between the third pull-down resistor and the fourth pull-down resistor is connected with the second diagnosis end of the controller.

16. The energy storage system of claim 11, wherein, The controller is further configured to send a first enable signal to the first driving circuit through the first power supply enable end. The first driving circuit is configured to adjust the opening and closing state of the first driving circuit according to the first enable signal, so as to control whether the first power supply supplies power to the coil loop.

17. The energy storage system of claim 11, wherein, The controller is further configured to: send a second enable signal to the second driving circuit through the second power supply enable end; The second driving circuit is configured to adjust the opening and closing state of the second driving circuit according to the second enable signal, so as to control whether the second power supply supplies power to the relay diagnosis circuit.

18. A control method of a relay characterized by comprising: The method is applied to the relay according to any one of claims 1-2, and the method comprises: The detection component in the relay collects the current of the main loop in which the main loop contact in the relay is located, and sends the current of the main loop to the relay diagnosis circuit in the relay; The relay diagnosis circuit controls the coil loop in the relay to switch to the open state in the case that the current of the main loop is greater than the preset current, so as to control the main loop contact to switch to the open state, and outputs a relay fault state signal to the controller based on the current of the main loop, wherein the relay fault state signal is used to indicate whether the relay has an overcurrent condition.

19. A control method of an energy storage system, characterized by, The method is applied to the energy storage system according to any one of claims 3-17, and the method comprises: The processor acquires a relay state diagnosis signal sent by the relay diagnosis circuit in the energy storage system; wherein the relay fault state signal is used to indicate whether the relay has an overcurrent condition; The processor determines whether the relay has a fault according to the relay fault state signal.

20. An electrical device, comprising: Comprise: The energy storage system according to any one of claims 3-17.

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