Relay, energy storage system, control method and electric equipment

Abstract

The invention relates to a relay, an energy storage system, a control method and electric equipment. The device comprises a coil loop, a main loop contact, a current detection part and a relay diagnosis circuit, and the relay diagnosis circuit is connected with the coil loop and the current detection part. Wherein the current detection part is used for collecting the current of a main loop where a main loop contact is located and sending the current of the main loop to the relay diagnosis circuit; and the relay diagnosis circuit is used for controlling the coil loop to be switched to an off state under the condition that the current of the main loop is greater than the preset current so as to control the main loop contact to be switched to an off state. Visibly, in the embodiment of the application, whether the main loop has an overcurrent condition can be rapidly detected through the current detection component arranged in the relay, and the relay can be timely disconnected through the relay diagnosis circuit, so that the relay and / or electric equipment can be protected.

Description

[0001] This invention patent application is a divisional application of the Chinese invention patent application with application date of May 29, 2024, application number 2024106763611, and name “Relay, energy storage system, control method and electrical equipment”. Technical Field

[0002] The present 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 Art

[0003] Typically, the output of the energy storage component in the electrical equipment can be connected to the external component through a relay. The main circuit where the relay is located can be a high-voltage circuit. If there is an overcurrent in the high-voltage circuit, it may cause certain damage to the relay and / or the electrical equipment.

[0004] Therefore, how to quickly detect whether there is an overcurrent in the main circuit and disconnect the relay in time is an urgent problem to be solved. Summary of the invention

[0005] In view of the above problems, the present application provides a relay, an energy storage system, a control method and an electrical device, which can quickly detect whether there is an overcurrent in the main circuit and disconnect the relay in time.

[0006] In a first aspect, the present application provides a relay, the relay comprising: a coil loop, a main loop contact, a current detection component and a relay diagnostic circuit, the relay diagnostic circuit being connected to the coil loop and the current detection component respectively; the current detection component being used to collect the current of the main loop where the main loop contact is located, and to send the current of the main loop to the relay diagnostic circuit; the relay diagnostic circuit being used to control the coil loop to switch to an open state when the current of the main loop is greater than a preset current, so as to control the main loop contact to switch to an open state;

[0007] The relay further comprises an auxiliary contact connected to the main circuit contact, and the output end of the auxiliary contact is connected to the relay diagnostic circuit; the auxiliary contact is used to send a state diagnostic signal of the auxiliary contact to the relay diagnostic circuit; wherein the state diagnostic signal of the auxiliary contact is used to indicate the open and closed state of the auxiliary contact; the relay diagnostic circuit is further used to determine the open and closed state of the auxiliary contact according to the state diagnostic signal; wherein the open and closed state of the auxiliary contact is used to indicate the open and closed state of the main circuit contact;

[0008] Among them, the output end 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 the relay has an overcurrent condition.

[0009] In the embodiment of the present application, on the one hand, by collecting the main circuit current through the current detection component set inside the relay, it is possible to quickly detect whether the main circuit has an overcurrent condition. Further, through the relay diagnostic circuit, when the current of the main circuit detected by the current detection component is greater than the preset current, the coil circuit can be promptly controlled to switch to the disconnected state, and the main circuit contact can be promptly controlled to switch to the disconnected state, so as to achieve the purpose of disconnecting the relay in time, thereby facilitating the protection of the relay and / or electrical equipment. On the other hand, in the embodiment of the present application, by setting an auxiliary contact in the relay and sending a state diagnosis signal of the auxiliary contact to the relay diagnostic circuit, there is no need to wait for the external high voltage release on the main circuit after the main circuit contact is disconnected. The relay diagnostic circuit can quickly determine the open and closed state of the main circuit contact according to the state diagnosis signal, thereby facilitating the detection efficiency of the open and closed state of the main circuit contact. Further, in the embodiment of the present application, by the relay diagnostic circuit outputting a relay fault state signal to the controller based on the current of the main circuit, the controller can quickly determine whether the relay has an overcurrent condition according to the relay fault state signal, so that the corresponding first preset protection measure can be executed in time, thereby facilitating the further improvement of the effect of protecting the relay and / or electrical equipment.

[0010] In some embodiments, the auxiliary contact is a mirror contact 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 end 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 the embodiment of the present application, the relay diagnostic circuit outputs a relay status diagnostic signal to the controller based on the open and closed state of the auxiliary contacts. There is no 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 open and closed state of the main circuit contacts based on the relay status diagnostic signal, thereby improving the detection efficiency of the open and closed state of the main circuit contacts.

[0013] In some embodiments, the relay diagnostic circuit includes: an auxiliary contact diagnostic module, wherein the input end of the auxiliary contact diagnostic module is connected to the output end of the auxiliary contact, and the output end of the auxiliary contact diagnostic module is connected to the controller; an auxiliary contact diagnostic module, which 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 contact according to the relay status diagnostic signal.

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

[0015] In the embodiment of the present application, when the current of the main circuit is greater than the preset current, the overcurrent diagnosis module can send an overcurrent diagnosis signal to the fault processing module, so that the fault processing module can control the coil circuit to switch to the disconnected state according to the overcurrent diagnosis signal, and can timely switch the main circuit contact to the disconnected state without waiting for the control of the controller. In addition, the fault processing module outputs a relay fault state signal to the controller according to the overcurrent diagnosis signal, so that the controller can quickly determine whether the relay has an overcurrent condition according to the relay fault state signal, so that the corresponding first preset protection measure can be executed in time.

[0016] In a second aspect, the present application provides an energy storage system, which includes a relay as described in any one of the first aspects above, and a controller connected to the relay; wherein the controller is used to: obtain 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 open and closed state of the main circuit contacts in the relay, and the relay fault status signal is used to indicate whether the relay has an overcurrent condition; determine whether the relay has a fault based on the relay fault status signal and / or the relay status diagnostic signal.

[0017] In an embodiment of the present application, the controller determines whether a relay is faulty based on 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 a 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 used to: when the control main circuit contact is in a closed state, if the relay state diagnosis signal is used to indicate that the main circuit contact is in an open state, then determine that the relay has a failure to close.

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

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

[0021] In some embodiments, the controller is specifically used to: when the main circuit contact in the control relay is in an open state, if the relay status diagnostic signal is used to indicate that the main circuit contact is in a closed state, it is determined that the relay cannot be disconnected or the relay control circuit has a fault.

[0022] In some embodiments, the energy storage system also includes: a high-voltage sampling circuit connected to the controller; a high-voltage sampling circuit, used to detect the voltage difference between the outside and inside of the main circuit contacts, and send the voltage difference to the controller; the controller is also used to: determine the open and closed 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, it is determined 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, it is determined that the relay cannot be disconnected.

[0023] In the embodiment of the present application, 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, which is beneficial to improving maintenance efficiency.

[0024] In some embodiments, the energy storage system also includes a drive circuit, wherein the power supply enable end of the controller is connected to the power supply end 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 supplies power to the power supply end of the relay.

[0025] In an embodiment of the present application, by setting a driving circuit between the power supply enable terminal of the controller and the power supply terminal of the relay, and by controlling the opening and closing state of the driving circuit to control whether the power supply source supplies power to the power supply terminal of the relay, the power supply terminal of the relay can be provided with electrical energy that can meet the required voltage to facilitate the normal operation of the relay.

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

[0027] In an embodiment of the present application, the power supply end of the coil circuit in the relay and the power supply end of the relay diagnostic circuit can be connected to the power supply enable end corresponding to the controller through the corresponding drive circuit respectively. The controller can control the opening and closing states of the corresponding drive circuits to control whether the corresponding power supply is supplying power, and can flexibly provide the power supply end of the coil circuit in the relay and the power supply end of the relay diagnostic circuit with electric energy that can meet the required voltage respectively.

[0028] In some embodiments, the energy storage system also includes: a power supply diagnostic circuit connected to the controller, wherein the power supply end of the power supply diagnostic circuit is connected to the detection power supply, the first transmission end of the power supply diagnostic circuit is respectively connected to the power supply ends of the first drive circuit and the coil loop, and the second transmission end of the power supply diagnostic circuit is respectively connected to the power supply ends of the second drive circuit and the relay diagnostic circuit; 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 loop and the relay diagnostic circuit according to the drive signal and / or the diagnostic feedback signal.

[0029] In the implementation of the present application, a power supply diagnostic circuit is set between the controller and the relay. The controller determines the power supply short circuit condition of the coil loop 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, so that when the power supply short circuit condition is detected, the corresponding second preset protection measure can be executed in time, thereby meeting the relay control and diagnosis of ASILC, which is beneficial to improving the stability of the relay and / or electrical equipment.

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

[0031] In the embodiment of the present application, the controller can quickly and accurately determine whether there is a short power fault in the coil loop or the relay diagnostic circuit based on 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.

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

[0033] In the embodiment of the present application, the controller controls the target diagnosis branch in the power supply diagnosis circuit to adjust the operating state through the target drive signal of the target drive enable terminal, so that the power supply diagnosis circuit returns the target diagnosis feedback signal to the controller through the target feedback terminal. Furthermore, if the voltage of the target diagnosis feedback signal is not greater than the second preset voltage, the controller can determine that there is a short-to-ground fault in the coil loop or the relay diagnosis circuit. It can be seen that in the embodiment of the present application, the controller can quickly and accurately determine whether there is a short-to-ground fault in the coil loop or the relay diagnosis circuit by combining the target drive signal and the target diagnosis feedback signal.

[0034] In some embodiments, the controller is also used for: 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 except the target diagnostic branch is not less than the first preset voltage, then 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 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 a detection power supply; a driving end of the first diagnostic switch is connected to a first driving enable end of a controller, a connection point between the first pull-up resistor and the first pull-down resistor is respectively connected to a power supply end of a first driving circuit and a coil loop, and a connection point between the first pull-down resistor and the second pull-down resistor is connected to a first diagnostic end 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 end of the second diagnostic switch is connected to the second driving enable end of the controller, the connection point between the second pull-up resistor and the third pull-down resistor is respectively connected to the power supply end of the second drive circuit and the relay diagnostic circuit, and the connection point between the third pull-down resistor and the fourth pull-down resistor is connected to the second diagnostic end of the controller.

[0037] In a third aspect, the present application provides a control method for a relay, the method being applied to a relay as described in any one of the first aspects above, the method comprising: a detection component in the relay collects the current of a main circuit where a main circuit contact in the relay 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 a disconnected state, so as to control the main circuit contact to switch to a disconnected state;

[0038] The method further comprises: the auxiliary contact in the relay sends a state diagnosis signal of the auxiliary contact to the relay diagnosis circuit; wherein the state diagnosis signal of the auxiliary contact is used to indicate the open and closed state of the auxiliary contact; the relay diagnosis circuit determines the open and closed state of the auxiliary contact according to the state diagnosis signal; wherein the open and closed state of the auxiliary contact is used to indicate the open and closed state of the main circuit contact;

[0039] The method further includes: the relay diagnosis circuit 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.

[0040] In a fourth aspect, the present application provides a control method for an energy storage system, which is applied to an energy storage system such as any one of the above-mentioned second aspects, and the method includes: a processor obtains 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 open and closed state of the main circuit contacts of the relay in the energy storage system, and the relay fault status signal is used to indicate whether the relay is in an overcurrent condition; the processor determines whether the relay is faulty based on the relay fault status signal and / or the relay status diagnostic signal.

[0041] In a fifth aspect, the present application provides an electrical device, including: an energy storage system as described in any one of the second aspects above.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0044] Figure 1 A schematic diagram of the structure of a relay provided in some embodiments of the present application;

[0045] Figure 2 A schematic diagram of the structure of a relay provided in some other embodiments of the present application;

[0046] Figure 3 A schematic diagram of the structure of a relay provided in some other embodiments of the present application;

[0047] Figure 4 A schematic diagram of the structure of a relay provided in some other embodiments of the present application;

[0048] Figure 5 A schematic diagram of the structure of a relay provided in some other embodiments of the present application;

[0049] Figure 6 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0050] Figure 7 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0051] Figure 8 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0052] Fig. 9 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0053] Fig.10 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0054] Fig.11 Schematic diagram of the process of the relay fault detection method provided in the embodiment of the present application Figure 1 ;

[0055] Fig.12 Schematic diagram of the process of the relay fault detection method provided in the embodiment of the present application Figure 2 ;

[0056] Fig.13 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0057] Fig.14 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0058] Fig.15 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0059] Fig.16 A schematic diagram of the structure of an energy storage system provided in some other embodiments of the present application;

[0060] Fig.17 A schematic diagram of a flow chart of a power supply short circuit detection method for an energy storage system provided in some embodiments of the present application;

[0061] Fig.18 A schematic flow chart of a relay control method provided in some embodiments of the present application;

[0062] Fig.19 A schematic flow chart of a control method for an energy storage system provided in some embodiments of the present application. DETAILED DESCRIPTION

[0063] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0065] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0066] The electric equipment provided in the embodiments of the present application may be, but is not limited to, electric toys, electric tools, battery vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0067] It should be noted that, for the convenience of explanation, the following embodiments are described by taking the electric device of the embodiment of the present application as an electric vehicle as an example. It should be understood that when the electric device of the embodiment of the present application is other equipment, its implementation principle and technical effect are similar.

[0068] Typically, the output of the energy storage component in the electrical equipment can be connected to the external component through a relay. The main circuit where the relay is located can be a high-voltage circuit. If there is an overcurrent in the high-voltage circuit, it may cause certain damage to the relay and / or the electrical equipment.

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

[0070] In view of the above problems, the embodiment of the present application proposes that the current detection component disposed inside the relay collects the current of the main circuit, so as to quickly detect whether there is an overcurrent in the main circuit. Furthermore, when the current of the main circuit detected by the current detection component is greater than the preset current, the relay diagnostic circuit disposed inside the relay can timely control the coil circuit to switch to the disconnected state, and timely control the main circuit contact to switch to the disconnected state, thereby achieving the purpose of disconnecting the relay in a timely manner, which is beneficial to protecting the relay and / or electrical equipment.

[0071] In some embodiments, Figure 1 A schematic diagram of the structure of a relay provided in some embodiments of the present application, such as Figure 1 As shown, the relay in the embodiment of the present application may include but is not limited to: a coil loop 10, a main loop contact 11, a current detection component 12 and a relay diagnostic circuit 13. Among them, the relay diagnostic circuit 13 can be connected to the coil loop 10 and the current detection component 12 respectively.

[0072] The coil loop 10 in the embodiment of the present application may refer to a loop to which a coil in a relay belongs, and may be used to control the open and close states of the main loop contacts 11 .

[0073] Exemplarily, the coil loop 10 may include, but is not limited to: a coil and a coil drive circuit. For example, when the coil drive circuit is in a closed state and the coil is provided with a preset electric energy that can satisfy the operation of the coil, current will flow through the coil to make the main circuit contact 11 in a closed state. For another example, when the coil drive circuit is in an open state, or the coil is not provided with a preset electric energy that can satisfy the operation of the coil, current will not flow through the coil to make the main circuit contact 11 in an open state.

[0074] The main circuit contact 11 in the embodiment of the present application may refer to a contact arranged in the main circuit. Exemplarily, the main circuit contact 11 may include but is not limited to a main positive contact and / or a main negative contact. Among them, one end of the main positive contact may be connected to the positive electrode of the energy storage component 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 may be connected to the negative electrode of the energy storage component in the electrical device, and the other end of the main negative contact may be connected to the above-mentioned external component or other external components.

[0075] The current detection component 12 in the embodiment of the present application can be 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 diagnosis circuit 13.

[0076] In a possible implementation, the current detection component 12 may be a current sensor. For example, the current detection component 12 may include but is not limited to a Hall sensor, wherein the distance between the setting position of the current detection component 12 and the main circuit may be less than the preset detection distance of the current detection component 12, so that the current of the main circuit where the main circuit contact 11 is located can be collected. Of course, the current detection component 12 may also be other types of current sensors, which will not be illustrated one by one in the embodiments of the present application.

[0077] In another possible implementation, the current detection component 12 may be a current detection circuit, wherein the current detection circuit may be connected to the main circuit so as to collect the current of the main circuit. For example, the current detection circuit may be connected to one end of the main negative contact.

[0078] Exemplarily, 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 diagnosis circuit 13. In another exemplary embodiment, 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 diagnosis circuit 13.

[0079] It should be understood that in the embodiment of the present application, by collecting the main circuit current through the current detection component 12 arranged inside the relay, and sending the collected main circuit current to the relay diagnostic circuit 13 inside the relay, it is possible to quickly detect whether there is an overcurrent condition in the main circuit.

[0080] The relay diagnostic circuit 13 in the embodiment of the present application can be used to control the coil circuit 10 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 contact 11 to switch to an open state. The preset current can refer to the short-circuit current threshold of the relay.

[0081] In the embodiment of the present application, when the current of 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 disconnected state, so that the main circuit contact 11 can be promptly controlled to switch to the disconnected state, thereby achieving the purpose of promptly disconnecting the relay.

[0082] In summary, the relay in the embodiment of the present application may include: a coil loop, a main loop contact, a current detection component and a relay diagnostic circuit, and the relay diagnostic circuit is connected to the coil loop and the current detection component respectively. Among them, the current detection component is used to collect the current of the main loop where the main loop contact is located, and send the current of the main loop to the relay diagnostic circuit; the relay diagnostic circuit is used to control the coil loop to switch to a disconnected state when the current of the main loop is greater than the preset current, so as to control the main loop contact to switch to a disconnected state. It can be seen that in the embodiment of the present application, by collecting the main loop current by the current detection component arranged inside the relay, it is possible to quickly detect whether there is an overcurrent in the main loop. Further, through the relay diagnostic circuit 13, when the current of the main loop detected by the current detection component 12 is greater than the preset current, the coil loop 10 can be promptly controlled to switch to a disconnected state, and the main loop contact 11 can be promptly controlled to switch to a disconnected state, so as to achieve the purpose of disconnecting the relay in a timely manner, thereby being conducive to protecting the relay and / or electrical equipment.

[0083] In some embodiments, Figure 2 The schematic diagram of the structure of the relay provided in other embodiments of the present application is based on the above embodiments, considering the need to quickly detect the open and closed state of the main circuit contacts in the relay during actual use, such as Figure 2 As shown, the relay in the embodiment of the present application 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 may 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: the auxiliary contact 14 and the main circuit contact 11 may be mechanically connected, and / or the auxiliary contact 14 and the main circuit contact 11 may be electrically connected.

[0084] In a possible implementation, the auxiliary contact 14 may be a mirror contact of the main circuit contact 11. When the main circuit contact 11 is in an open state, the auxiliary contact 14 may be in a closed state; when the main circuit contact 11 is in a closed state, the auxiliary contact 14 may be in an open state.

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

[0086] In another possible implementation, the auxiliary contact 14 may be a synchronization contact of the main circuit contact 11. When the main circuit contact 11 is in an open state, the auxiliary contact 14 may be in an open state; when the main circuit contact 11 is in a closed state, the auxiliary contact 14 may be in a closed state.

[0087] The output end of the auxiliary contact 14 in the embodiment of the present application can be connected to the relay diagnostic circuit 13, so that the auxiliary contact 14 can send a state diagnostic signal of the auxiliary contact 14 to the relay diagnostic circuit 13, wherein the state diagnostic signal can be used to indicate the opening and closing state of the auxiliary contact 14. Exemplarily, when the opening and closing state of the auxiliary contact 14 is a closed state, the level of the state diagnostic signal can be a first level; when the opening and closing state of the auxiliary contact 14 is an open state, the level of the state diagnostic signal can be a second level; wherein the first level can be greater than the second level.

[0088] As another example, when the opening and closing state of the auxiliary contact 14 is a closed state, the level of the state diagnosis signal may be a second level; when the opening and closing state of the auxiliary contact 14 is an open state, the level of the state diagnosis signal may be a first level.

[0089] The relay diagnostic circuit 13 in the embodiment of the present application can determine the open / closed state of the auxiliary contact 14 according to the state diagnostic signal. It should be understood that since the open / closed state of the auxiliary contact 14 can be related to the open / closed state of the main circuit contact 11, the open / closed state of the auxiliary contact 14 can be used to indicate the open / closed state of the main circuit contact 11. Therefore, the relay diagnostic circuit 13 can indirectly determine the open / closed state of the main circuit contact 11 according to the state diagnostic signal.

[0090] In summary, compared with the method in the related art of determining the opening and closing state of the main circuit contacts based on the voltage difference between the outer and inner sides of the main circuit contacts collected by the high-voltage sampling circuit, in the embodiment of the present application, by setting an auxiliary contact in the relay and sending a status diagnosis signal of the auxiliary contact to the relay diagnostic circuit, there is no need 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 diagnosis signal, which is beneficial to improving the detection efficiency of the opening and closing state of the main circuit contacts.

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

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

[0093] Exemplarily, when the opening and closing state of the auxiliary contact 14 is a closed state, the level of the relay state diagnostic signal can be a third level; when the opening and closing state of the auxiliary contact 14 is an open state, the level of the relay state diagnostic signal can be a fourth level; wherein the third level can be greater than the fourth level.

[0094] As another example, when the opening and closing state of the auxiliary contact 14 is a closed state, the level of the relay state diagnostic signal can be a fourth level; when the opening and closing state of the auxiliary contact 14 is an open state, the level of the relay state diagnostic signal can be a 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 with the method in the related art of determining the opening and closing state of the main circuit contacts based on the voltage difference between the outer and inner sides of the main circuit contacts collected by the high-voltage sampling circuit, in the embodiment of the present application, the relay diagnostic circuit outputs a relay status diagnostic signal to the controller based on the opening and closing state of the auxiliary contacts. There is no 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 schematic diagram of the structure of the relay provided in some other embodiments of the present application is based on the above embodiments, and the embodiments of the present application further illustrate the relevant contents of the relay diagnostic circuit 13. Figure 3 As shown, the relay diagnostic circuit 13 in the embodiment of the present application may include an auxiliary contact diagnostic module 130 .

[0098] Exemplarily, the input end of the auxiliary contact diagnosis module 130 can be connected to the output end of the auxiliary contact 14 so as to obtain the state diagnosis signal of the auxiliary contact 14. The output end of the auxiliary contact diagnosis module 130 can be connected to the controller 2 so as to output the relay state diagnosis signal to the controller 2 based on the open and closed state of the auxiliary contact 14, so that the controller 2 can quickly determine the open and closed state of the main circuit contact according to the relay state diagnosis signal.

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

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

[0101] Exemplarily, when the current in the main circuit is greater than the preset current, the level of the relay fault status signal may 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 may be the sixth level; wherein the fifth level may be greater than the sixth level.

[0102] As another example, when the current of the main circuit is greater than the preset current, the level of the relay fault state signal may be the sixth level; when the current of the main circuit is not greater than the preset current, the level of the relay fault state signal may 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 the embodiments of the present application, by outputting a relay fault status signal to the controller based on the current of the main circuit through the relay diagnostic circuit, the controller can quickly determine whether the relay has an overcurrent condition according to the relay fault status signal, so that the corresponding first preset protection measure can be executed in time, which is beneficial to further improve the effect of protecting the relay and / or electrical equipment.

[0105] In some embodiments, Figure 4 The schematic diagram of the structure of the relay provided in some other embodiments of the present application is based on the above embodiments, and the embodiments of the present application further illustrate the relevant contents of the relay diagnostic circuit 13. Figure 4 As shown, the relay diagnosis circuit 13 in the embodiment of the present application may include: an overcurrent diagnosis module 131 and a fault processing module 132 .

[0106] The input end of the overcurrent diagnosis module 131 in the embodiment of the present application can be connected to the output end 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] The output end of the overcurrent diagnosis module 131 in the embodiment of the present application can be connected to the input end of the fault processing module 132, so that when the current of the main circuit is greater than the preset current, the overcurrent diagnosis module 131 can send an overcurrent diagnosis signal to the fault processing module 132. The overcurrent diagnosis signal can be used to indicate that the relay has an overcurrent condition.

[0108] The first output end of the fault processing module 132 in the embodiment of the present application can be connected to the coil loop 10, so that the fault processing module 132 can control the coil loop 10 to switch to the disconnected state according to the overcurrent diagnosis signal, so that the main circuit contact 11 is switched to the disconnected state.

[0109] It can be seen that in the embodiment of the present 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 disconnected state according to the overcurrent diagnosis signal, and the main circuit contact 11 can be switched to the disconnected state in time without waiting for the control of the controller.

[0110] The second output end of the fault processing module 132 in the embodiment of the present application can be connected to the controller 2, so that the fault processing 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 the relay has an overcurrent condition according to the relay fault status signal, and thus can promptly execute the corresponding first preset protection measure.

[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 processing module 132, wherein the current diagnosis signal can be used to indicate that the relay does not have an overcurrent condition.

[0112] Correspondingly, the fault processing module 132 can output a relay fault status signal (used to indicate that the relay does not have an overcurrent condition) to the controller 2 according to the current diagnosis signal, so that the controller 2 can quickly determine whether the relay has an overcurrent condition according to the relay fault status signal.

[0113] It should be understood that the second output terminal of the fault processing module 132 may be the second output terminal of the relay diagnosis 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 schematic diagram of the structure of the relay provided in some other embodiments of the present application is based on the above embodiments. The embodiments of the present application provide an exemplary introduction to the overall structure of the relay, such as Figure 5 As shown, the relay in the embodiment of the present application may include: a coil circuit 10, a main circuit contact (or relay high voltage contact) 11 arranged in the main circuit, a current detection component 12, a relay diagnostic circuit 13 and an auxiliary contact 14. Among them, the auxiliary contact 14 can be a mirror contact of the main circuit contact 11.

[0115] Exemplarily, the coil loop 10 may include a coil 100 and a coil drive circuit 101. The main loop 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 electrode 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 electrode of the energy storage component Es, and the other end of the main negative contact 111 may be connected to the above-mentioned external component or other external components.

[0116] Exemplarily, the relay diagnosis circuit 13 may include an auxiliary contact diagnosis module 130 , an overcurrent diagnosis module 131 and a fault processing module 132 .

[0117] Among them, the input end of the auxiliary contact diagnostic module 130 can be connected to the output end of the auxiliary contact 14 so that the status diagnostic signal of the auxiliary contact 14 can be obtained, and the output end of the auxiliary contact diagnostic module 130 can be connected to the first input end of the controller 2 so that the relay status diagnostic signal can be output to the controller 2 based on the opening and closing state of the auxiliary contact 14.

[0118] Among them, the input end of the overcurrent diagnosis module 131 can be connected to the output end of the current detection component 12, so as 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. The output end of the overcurrent diagnosis module 131 can be connected to the input end of the fault processing module 132, so that the overcurrent diagnosis module 131 can send an overcurrent diagnosis signal to the fault processing module 132 when the current of the main circuit is greater than the preset current.

[0119] The first output terminal of the fault processing module 132 can be connected to the coil drive circuit 101, so that the fault processing module 132 can control the coil drive circuit 101 to switch to the disconnected state according to the overcurrent diagnosis signal, so that the main circuit contact 11 is switched to the disconnected state. Exemplarily, the fault processing module 132 can send a shutdown signal to the coil drive circuit 101 to switch the coil drive circuit 101 to the disconnected state.

[0120] The second output terminal of the fault processing module 132 can be connected to the second input terminal of the controller 2, so that the fault processing 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 the relay has an overcurrent condition according to the relay fault status signal.

[0121] In the embodiments of the present application, the implementation methods of each module can refer to the relevant contents in the above embodiments, which will not be repeated here.

[0122] It should be noted that, compared with the related art, a fuse (thermal melt) can be set between the relay and the energy storage component, but the overcurrent threshold of the relay and the melting curve of the fuse may not match, resulting in the risk of adhesion or even explosion of the relay. The relay in the embodiment of the present application can realize the function of the fuse by setting a current detection component 12, a relay diagnostic circuit 13 and an auxiliary contact 14 inside. Therefore, there is no need to set a fuse between the relay and the energy storage component, thereby solving the problem of selection and matching of fuses and relays in the related art.

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

[0124] The controller 2 in the embodiment of the present application can obtain the relay state diagnosis signal and the relay fault state signal sent by the relay diagnosis circuit 13 in the relay 1. Among them, the relay state diagnosis signal can be used to indicate the open and closed state of the main circuit contact 11 in the relay 1, and the relay fault state signal can be used to indicate whether the relay 1 is short-circuited.

[0125] Further, the controller 2 can determine whether the relay 1 has a fault according to the relay fault state signal and / or the relay state diagnostic signal. Among them, the fault may include but is not limited to at least one of the following: an inability to close the loop fault, an overcurrent fault, a relay control circuit fault, and an inability to disconnect fault (or it can be called a sticking fault). Among them, the inability to close fault refers to a fault in which the relay is stuck in the disconnected state and cannot be closed; the inability to disconnect fault refers to a fault in which the relay is stuck in the closed state and cannot be disconnected; the relay control circuit fault may include but is not limited to a relay drive circuit fault and / or a coil drive circuit fault in the relay.

[0126] In a possible implementation, the controller 2 may be specifically used for: when the main circuit contact 11 is controlled to be in a closed state, if the relay state diagnosis signal is used to indicate that the main circuit contact 11 is in an open state, it can be determined that the relay 1 has a failure to close.

[0127] In this implementation, the controller 2 can control the main circuit contact 11 to be in a closed state, that is, the main circuit contact 11 should be in a closed state, but the relay state diagnostic signal obtained from the relay diagnostic circuit 13 is used to indicate that the main circuit contact 11 is in a disconnected state, then it can be determined that the relay 1 is stuck in the disconnected state and cannot be closed, and there is a failure to close.

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

[0129] In this implementation, if the relay fault state 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 the relay has an overcurrent fault or a relay control circuit fault, the relay status diagnostic signal is used to indicate that the main circuit contact 11 is in a closed state, and the controller 2 can also be used to control the main circuit contact 11 to be in an open state.

[0131] In an embodiment of the present application, when the relay fault status signal is used to indicate that the relay 1 has an overcurrent condition, 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 electrical equipment.

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

[0133] In this implementation, the controller 2 can control the main circuit contact 11 in the relay 1 to be in a disconnected state, that is, the main circuit contact 11 should be in a disconnected state, but the relay state diagnostic signal obtained from the relay diagnostic circuit 13 is used to indicate that the main circuit contact 11 is in a closed state. In this case, it can be determined that the relay 1 is stuck in a closed state and cannot be disconnected, there is a disconnection failure, or there is a control circuit failure of the relay diagnostic circuit 13.

[0134] It should be understood that in the event of a relay control circuit failure, the relay diagnostic circuit 13 may not be able to operate normally. Therefore, there may be a situation where the relay 1 is in an open state, but the obtained relay state diagnostic signal is used to indicate that the main circuit contact 11 is in a closed state, that is, the relay state diagnostic signal is erroneous.

[0135] In some embodiments, Figure 7 The schematic diagram of the structure of the energy storage system provided in some other embodiments of the present application, based on the above embodiments, considering that the relay control circuit may fail, the embodiments of the present application can further combine the high-voltage sampling circuit to detect the voltage difference between the outside and inside of the main circuit contacts, determine the open and closed state of the main circuit contacts, so as to detect the type of fault in the relay. Figure 7 As shown, the energy storage system in the embodiment of the present application may further include a high-voltage sampling circuit 3 connected to the controller 2 .

[0136] The high-voltage sampling circuit 3 in the embodiment of the present application 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. Exemplarily, 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 a closed state, the voltage difference between the outer and inner sides of the contact may be less than the preset voltage difference; when any contact is in an open state, the voltage difference between the outer and inner sides of the contact may not be less than the preset voltage difference.

[0138] The controller 2 in the embodiment of the present application can also be used to: determine the open and closed 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, it is determined 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, it is determined that the relay cannot be disconnected.

[0139] In the embodiment of the present application, the controller 2 can determine the open and closed state of the main circuit contact by comparing the voltage difference between the outer and inner sides of the main circuit contact 11 with the 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. For another example, 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 disconnected state, that is, the relay state diagnosis signal obtained by the relay diagnosis circuit 13 is incorrect, the controller 2 can determine that there is a fault in the relay control circuit, causing the relay diagnosis circuit 13 to possibly fail to operate normally.

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

[0142] In summary, in the embodiments of the present 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 type of fault in the relay can be more accurately detected, so that maintenance personnel can perform accurate maintenance on the relay, which is conducive to improving maintenance efficiency.

[0143] It should be understood that if the relay control circuit fails, it is still possible to determine whether the main circuit contacts are in an open or closed state based on the voltage difference between the outside and inside of the main circuit contacts detected by the high-voltage sampling circuit, which is conducive to improving the detection flexibility of the opening and closing state of the main circuit contacts.

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

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

[0146] In one possible implementation, when the required voltages of various modules in the relay 1 are consistent, the power supply enable terminal of the controller 2 can be connected to the power supply terminal of the relay 1 through a drive circuit 4, which can not only provide the relay with electrical energy that can meet the required voltage, but also save circuit costs and circuit volume.

[0147] In another possible implementation, when the required voltages of at least two modules in the relay 1 are inconsistent, the power supply enable end of the controller 2 can be connected to the power supply end of each module in the relay 1 through at least two drive circuits 4, so that the corresponding modules can be flexibly provided with electric energy that can meet the required voltage.

[0148] In summary, in the embodiments of the present application, by setting a driving circuit between the power supply enable terminal of the controller and the power supply terminal of the relay, and by controlling the opening and closing state of the driving circuit to control whether the power supply source supplies power to the power supply terminal of the relay, the power supply terminal of the relay can be provided with electrical energy that can meet the required voltage to facilitate the normal operation of the relay.

[0149] In some embodiments, Fig. 9 This is a schematic diagram of the structure of the energy storage system provided in some other embodiments of the present application. Based on the above embodiments, the present embodiment takes the relay including the coil loop 10 and the relay diagnostic circuit 13 as an example to exemplarily introduce and explain the relevant contents of the drive circuit 4. Fig. 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 power supply voltage of the first power supply Ps1 and the power supply voltage of the second power supply Ps2 may be the same.

[0150] The power supply end of the coil loop 10 in the relay 1 can be connected to the first power supply enable end and the first power supply Ps1 of the controller 2 through the first drive circuit 40. The power supply end of the relay diagnostic circuit 13 in the relay 1 can be connected to the second power supply enable end and the second power supply Ps2 of the controller 2 through the second drive circuit 41. Exemplarily, the power supply end of the relay diagnostic circuit 13 in the relay 1 is the power supply end 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 the embodiment of the present application 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 loop 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] Exemplarily, the controller 2 may 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 loop 10 by sending a first enable signal to the first drive circuit 40 through the first power supply enable terminal. For example, if the level of the first enable signal is the seventh level, the controller 2 may control the first drive circuit 40 to be in a closed state to control the first power supply Ps1 to supply power to the coil loop 10; if the level of the first enable signal is the eighth level, the controller 2 may control the first drive circuit 40 to be in an open state to control the first power supply Ps1 to be unable to supply power to the coil loop 10; wherein the seventh level may be greater than the eighth level.

[0153] Exemplarily, the controller 2 may 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 by sending a second enable signal to the second drive circuit 41 through the second power supply enable terminal. For example, if the level of the second enable signal is the ninth level, the controller 2 may control 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; if the level of the second enable signal is the tenth level, the controller 2 may control the second drive circuit 41 to be in an open state to control the second power supply Ps2 to be unable to supply power to the relay diagnostic circuit 13; wherein the ninth level may be greater than the tenth level.

[0154] It should be understood that the 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, the second power supply Ps2 is controlled to supply power to the relay control circuit. The controller 2 controls the second drive circuit 41 to be in an open state to control the second power supply Ps2 to be unable to supply power to the relay diagnostic circuit 13, that is, the second power supply Ps2 is controlled to be unable to supply power to the relay control circuit.

[0155] In summary, in the embodiments of the present application, the power supply end of the coil circuit in the relay and the power supply end of the relay diagnostic circuit can be connected to the power supply enable end corresponding to the controller through the corresponding drive circuit respectively. The controller can control the opening and closing states of the corresponding drive circuits to control whether the corresponding power supply is supplying power, and can flexibly provide the power supply end of the coil circuit in the relay and the power supply end of the relay diagnostic circuit with electric energy that can meet the required voltage respectively.

[0156] In some embodiments, Fig.10 This is a schematic diagram of the structure of the energy storage system provided in some other embodiments of the present application. Based on the above embodiments, the embodiments of the present application take the controller, the drive circuit and the relay as examples to exemplify the relevant contents of the energy storage system. The implementation methods of each module in the relay in the embodiments of the present application can refer to the above Figure 5 The relevant contents of the illustrated embodiment will not be repeated here. In the following embodiments of the present application, the relevant contents of the connection mode between the controller and the relay are mainly introduced and explained as examples.

[0157] like Fig.10 As shown, considering that the voltage of the power supply enable terminal of the controller may not be able to meet the required voltage of the power supply terminal of the relay diagnostic circuit and the power supply terminal of the coil 100 (for example, 12V or 24V, etc.), therefore, in an embodiment of the present application, 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 power 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 power the relay control circuit, etc.

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

[0159] Exemplarily, when the level of the first enable signal at the first power supply enable terminal is the seventh level (or referred to as the 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 the coil drive circuit 101 power supply enable), the first drive circuit 40 can be in a closed state, and the coil loop 10 can operate normally, that is, the coil drive circuit 101 is in a closed state, current can pass 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 passes through the coil 100, and the main positive contact 110 and the main negative contact 111 can be in a disconnected state.

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

[0161] It should be understood that Fig.10 The first power enable terminal is port GPIO1, the second power enable terminal is port GPIO5, and the third power enable terminal is port GPIO2 as an example. 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, which is not limited in the embodiments of the present application.

[0162] Exemplarily, the output terminal of the auxiliary contact diagnosis module 130 may be connected to the first input terminal of the controller 2 , so as to output a relay state diagnosis signal to the controller 2 based on the open and closed state of the auxiliary contact 14 .

[0163] Exemplarily, the output end of the overcurrent diagnosis module 131 can be connected to the input end of the fault processing module 132, so that the overcurrent diagnosis module 131 can send an overcurrent diagnosis signal to the fault processing module 132 when the current of the main circuit is greater than a preset current.

[0164] It should be understood that Fig.10 In the figure, the first input end is port ADC1 and the second input end is port ADC2. Of course, the first input end or the second input end can also be other ports in the controller according to different signal types, which is not limited in the embodiments of the present application.

[0165] It should be noted that when the controller determines that the relay needs to be disconnected or determines that the relay is faulty based on the relay status diagnostic signal, the controller needs to disconnect both the power supply end of the coil drive circuit 101 and the power supply end of the coil 100 to protect the relay.

[0166] In some embodiments, Fig.11 Schematic diagram of the process of the relay fault detection method provided in the embodiment of the present application Figure 1 Based on the above embodiment, the method of the embodiment of the present application may include the following steps:

[0167] Step S1101: low voltage power-on of the controller is completed.

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

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

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

[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 whole vehicle. When the voltage difference between the outside and inside of the relay is less than a certain value, the pre-charging process can be considered completed.

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

[0173] Step S1104: the controller controls the coil loop to switch to a closed state.

[0174] Exemplarily, the controller may control the coil 100 to be powered on and the coil drive circuit 101 to be powered on, so that the coil loop is switched to a closed state, so that the main loop contacts may be switched to a closed state.

[0175] Step S1105: The controller determines whether the main circuit contacts are in a closed state according to the relay status diagnosis signal.

[0176] If it is determined according to the relay state diagnosis signal that the main circuit contact is in an open state, step S1106 can be executed; if it is determined according to the relay state diagnosis signal that the main circuit contact is in a 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 the relay cannot close.

[0179] Step S1107: The controller determines whether the relay has an overcurrent fault according to the relay fault state signal.

[0180] If it is determined according to the relay fault state signal that the relay has an overcurrent fault, step S1108 is executed; if it is determined according to the relay fault state signal whether the relay has an overcurrent fault, step S1110 is executed.

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

[0182] Exemplarily, the controller may control the power supply end of the coil 100 to be disconnected and the power supply end of the coil driving circuit 101 to be disconnected, so that the coil loop is switched to a disconnected state, so that the main loop contact may be switched to a disconnected state.

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

[0184] It should be understood that the controller can also report to the vehicle controller whether there is an overcurrent fault in the relay or a fault in the relay control circuit.

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

[0186] For example, the controller may determine whether a high-voltage command for the entire vehicle is received, or whether there is a fault in the controller.

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

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

[0189] Exemplarily, the controller may control the power supply end of the coil 100 to be disconnected and the power supply end of the coil driving circuit 101 to be disconnected, so that the coil loop is switched to a disconnected state, so that the main loop contact may be switched to a disconnected state.

[0190] Step S1112: The controller determines whether the main circuit contact is in an open state according to the relay status diagnosis signal.

[0191] If it is determined according to the relay state diagnosis signal that the main circuit contact is in an open state, the detection process can be ended; if it is determined according to the relay state diagnosis signal that the main circuit contact is in a closed state, step S1113 can be executed.

[0192] Step S1113: The controller determines that the relay has a disconnection failure.

[0193] It should be understood that the controller can also report to the vehicle controller that the relay cannot be disconnected.

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

[0195] In some embodiments, Fig.12 Schematic diagram of the process of the relay fault detection method provided in the embodiment of the present application Figure 2 On the basis of the above embodiments, the embodiment of the present application further combines the voltage difference between the outer and inner sides of the main circuit contacts detected by the high-voltage sampling circuit. The method of the embodiment of the present application may include the following steps:

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

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

[0198] Step S1202: The controller controls the coil loop to switch to a closed state.

[0199] Exemplarily, the controller may control the coil 100 to be powered on and the coil drive circuit 101 to be powered on, so that the coil loop is switched to a closed state, so that the main loop contacts may be switched to a closed state.

[0200] Step S1203: The controller determines whether the main circuit contacts are in a closed state according to the relay status diagnosis signal.

[0201] If it is determined according to the relay state diagnosis signal that the main circuit contact is in an open state, step S1204 can be executed; if it is determined according to the relay state diagnosis signal that the main circuit contact is in a 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 the relay cannot close.

[0204] Step S1205: The controller determines whether the relay has an overcurrent fault according to the relay fault state signal.

[0205] If it is determined according to the relay fault state signal that the relay has an overcurrent fault, step S1206 is executed; if it is determined according to the relay fault state signal that the relay does not have an overcurrent fault, step S1214 is executed.

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

[0207] Exemplarily, the controller may control the power supply end of the coil 100 to be disconnected and the power supply end of the coil driving circuit 101 to be disconnected, so that the coil loop is switched to a disconnected state, so that the main loop contact may be switched to a disconnected state.

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

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

[0210] Step S1208: The controller determines whether the main circuit contact is in an open state according to the relay status diagnosis signal.

[0211] If it is determined according to the relay state diagnosis signal that the main circuit contact is in an open state, the detection process can be ended; if it is determined according to the relay state diagnosis signal that the main circuit contact is in a 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, step S1210 is executed; if it is determined that there is a high-voltage sampling circuit outside the relay, step S1211 is executed. The high-voltage sampling circuit can be used to detect the voltage difference between the outside and inside of the main circuit contact.

[0214] Step S1210: The controller determines that the relay has a disconnection failure.

[0215] It should be understood that the controller can also report to the vehicle controller that the relay cannot be disconnected.

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

[0217] Exemplarily, the controller may control the level of the second enable signal to be at an eighth level so that the second drive circuit is in a disconnected state.

[0218] Step S1212: The controller determines whether the main circuit contacts are in a disconnected state according to the voltage difference detected by the high-voltage sampling circuit.

[0219] If the main circuit contact is determined to be in a closed state according to the voltage difference detected by the high-voltage sampling circuit, step S1210 is executed; if the main circuit contact is determined to be in an open state according to the voltage difference detected by the high-voltage sampling circuit, 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 may determine whether a high-voltage command for the entire vehicle is received, or whether there is a fault in the controller.

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

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

[0225] Exemplarily, the controller may control the power supply end of the coil 100 to be disconnected and the power supply end of the coil driving circuit 101 to be disconnected, so that the coil loop is switched to a disconnected state, so that the main loop contact may be switched to a disconnected state.

[0226] Step S1216: The controller determines whether the main circuit contact is in the disconnected state according to the relay status diagnosis signal.

[0227] If it is determined according to the relay state diagnosis signal that the main circuit contact is in an open state, the detection process can be ended; if it is determined according to the relay state diagnosis signal that the main circuit contact is in a closed state, step S1209 can be executed.

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

[0229] In some embodiments, Fig.13A structural schematic diagram of the energy storage system provided for other embodiments of the present application. On the basis of the above-mentioned embodiments, in order to meet the relay control and diagnosis of the automotive safety integrity level (ASILC), it is necessary to perform relevant diagnosis on the control output of the relay, such as short to ground and short to power supply. In particular, it is necessary to diagnose the short circuit fault of the coil power supply and the relay diagnostic circuit power supply. Because when these two power supplies are short-circuited, an internal fault occurs in the relay at the same time. Even if the control relay is disconnected, the relay may not be disconnected. Although it is a double-point failure, the failure also needs to be resolved for the safety goal of ASILC. Therefore, the embodiment of the present application further adds a power supply diagnostic circuit, which can be used to detect the above-mentioned short circuit fault.

[0230] like Fig.13 As shown, the energy storage system of the embodiment of the present application further includes: a power supply diagnosis circuit 5 connected to the controller 2. The power supply end of the power supply diagnosis circuit 5 can be connected to the detection power supply Pd; the first transmission end Tt1 of the power supply diagnosis circuit 5 can be connected to the power supply ends of the first drive circuit 40 and the coil loop 10 respectively, so that when the first drive circuit 40 is in a closed state, the electric energy of the first power supply Ps1 can be transmitted to the power supply end of the coil loop 10.

[0231] Exemplarily, 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 a closed state, the electric energy of the second power supply Ps2 can be transmitted to the power supply terminal of the relay diagnostic circuit 13.

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

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

[0234] Of course, the controller 2 may also control the operating state of the power supply diagnosis circuit 5 in other ways, and the power supply diagnosis circuit 5 may also return a diagnosis feedback signal to the controller 2 in other ways.

[0235] The controller 2 in the embodiment of the present application can also be used to determine the power supply short circuit condition of the coil loop 10 and the relay diagnostic circuit 13 according to the drive signal and / or the 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, short circuit fault between power supply terminals. It should be understood that the power supply short circuit condition of the coil loop 10 and the relay diagnostic circuit 13 is the power supply short circuit condition of the coil loop 10 and the relay control loop.

[0236] In a possible implementation, the controller 2 may determine the power supply short circuit condition of the coil loop 10 and the relay diagnosis circuit 13 according to the driving signal.

[0237] In another possible implementation, the controller 2 may determine the power supply short circuit condition of the coil loop 10 and the relay diagnosis circuit 13 according to the drive signal and the diagnosis feedback signal.

[0238] In another possible implementation, the controller 2 may determine the power supply short circuit condition of the coil loop 10 and the relay diagnostic circuit 13 according to the diagnostic feedback signal.

[0239] In summary, in the implementation of the present application, a power supply diagnostic circuit is set between the controller and the relay. The controller determines the power supply short circuit condition of the coil loop 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, so that when a power supply short circuit is detected, the corresponding second preset protection measures can be executed in time, thereby meeting the relay control and diagnosis of ASILC, which is beneficial to improving the stability of the relay and / or electrical equipment.

[0240] In some embodiments, Fig.14 A structural schematic diagram of an energy storage system provided for other embodiments of the present application. On the basis of the above-mentioned embodiments, the first driving end of the power supply diagnostic circuit 5 in the embodiments of the present application can be connected to the first driving enable end of the controller 2, so that the controller 2 can send a first driving signal to the first driving end of the power supply diagnostic circuit 5 through the first driving enable end to control whether the connection line between the detection power supply Pd and the first power supply end of the power supply diagnostic circuit 5 is conductive.

[0241] It should be understood that, in the default state, the controller 2 will control the connection line between the detection power supply Pd and the first power supply end of the power supply diagnostic circuit 5 to be non-conductive. Only when the power supply short circuit of the coil loop needs to be detected, the connection line between the detection power supply Pd and the first power supply end of the power supply diagnostic circuit 5 will be controlled to be conductive.

[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 diagnosis circuit 5 is not conductive, the voltage of the first drive signal of the first drive enable terminal should be lower than the first preset voltage in theory. The voltage of the first preset voltage is very small, for example, the first preset voltage can be a voltage close to 0V.

[0243] The second driving end of the power supply diagnostic circuit 5 in the embodiment of the present application can be connected to the second driving enable end of the controller 2, so that the controller 2 can send a second driving signal to the second driving end of the power supply diagnostic circuit 5 through the second driving enable end to control whether the connection line between the detection power supply Pd and the second power supply end of the power supply diagnostic circuit 5 is conductive.

[0244] It should be understood that, in the default state, the controller 2 will control the connection line between the detection power supply Pd and the second power supply end of the power supply diagnostic circuit 5 to be non-conductive. Only when it is necessary to detect a power supply short circuit of the relay diagnostic circuit, will the connection line between the detection power supply Pd and the second power supply end of the power supply diagnostic circuit 5 be controlled to be conductive.

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

[0246] The controller 2 in the embodiment of the present application can be specifically 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 not less than the first preset voltage, it is determined that there is a short power fault in the coil loop 10 or the relay diagnostic circuit 13.

[0247] In a possible implementation, considering that the controller 2, in a default state, controls the connection line between the detection power supply Pd and the first power supply terminal of the power supply diagnosis circuit 5 to be non-conductive, that is, the voltage of the first drive signal of the first drive enable terminal should be theoretically less than the first preset voltage, therefore, if the voltage of the first drive signal of the first drive enable terminal is not less than the first preset voltage, the controller 2 can determine that there is a short power fault in the coil loop 10. The short power fault in the coil loop 10 may refer to a short circuit between the power supply terminal of the coil loop 10 and the first power supply.

[0248] In another possible implementation, considering that the controller 2, in the default state, controls the connection line between the detection power supply Pd and the second power supply terminal of the power supply diagnosis circuit 5 to be non-conductive, that is, the voltage of the second drive signal of the second drive enable terminal should be less than the first preset voltage in theory, therefore, if the voltage of the second drive signal of the second drive enable terminal is not less than the first preset voltage, the controller 2 can determine that there is a short power fault in the relay diagnosis circuit 13. Among them, the short power fault in the relay diagnosis circuit 13 can refer to the short circuit between the power supply terminal of the relay diagnosis circuit 13 and the second power supply.

[0249] In summary, in the embodiment of the present application, the controller can quickly and accurately determine whether there is a short power fault in the coil loop 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.

[0250] In some embodiments, Fig.15 The schematic diagram of the structure of the energy storage system provided in some other embodiments of the present application is based on the above embodiments, such as Fig.15 As shown, the power supply diagnosis circuit 5 in the embodiment of the present application may include a first diagnosis branch 50 and a second diagnosis branch 51. The first return detection end of the first diagnosis branch 50 may be connected to the first diagnosis end of the controller 2, and the second return detection end of the second diagnosis branch 51 may be connected to the second diagnosis end of the controller 2.

[0251] The controller 2 in the embodiment of the present application can also be used for: 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 the first preset voltage, the target diagnosis branch in the power supply diagnosis circuit 5 is controlled to adjust the operation state through the target drive signal of the target drive enable terminal, so that the connection line between the target power supply terminal of the target diagnosis branch and the detection power supply Pd is turned on. Wherein, the target drive enable terminal is the first drive enable terminal or the second drive enable terminal, and correspondingly, the target diagnosis branch is the first diagnosis branch 50 or the second diagnosis 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 is less than the first preset voltage, that is, there is no short power fault in the coil loop or the relay diagnostic circuit, the controller 2 can send a first drive signal to the first drive end 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 the operating state, so that the connection line between the first power supply end of the first diagnostic branch 50 and the detection power supply Pd is turned on.

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

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

[0255] It should be noted that, when the connection line between the target power supply end of the target diagnostic branch and the detection power supply Pd is turned on, the voltage at the target return detection end should theoretically be greater than the second preset voltage. The second preset voltage is associated with the detection voltage of the detection power supply Pd. Exemplarily, the second preset voltage may be less than the divided voltage of the detection voltage of the detection power supply Pd at the target return detection end. For example, the second preset voltage may be slightly less than the divided voltage of the detection voltage at the target return detection end.

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

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

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

[0259] In the embodiment of the present application, considering that when the connection line between the target power supply end of the target diagnostic branch and the detection power supply Pd is turned on, the voltage of the target feedback end should be greater than the second preset voltage in theory. Therefore, if the voltage of the target 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 loop or relay diagnostic circuit connected to the target diagnostic branch. Among them, the short-to-ground fault in the coil loop can refer to a short circuit between the power supply end of the coil loop and the ground, and the short-to-ground fault in the relay diagnostic circuit can refer to a short circuit between the power supply end of the relay diagnostic circuit and the ground.

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

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

[0262] In summary, in the embodiment of the present application, the controller controls the target diagnosis branch in the power supply diagnosis circuit to adjust the operating state through the target drive signal of the target drive enable terminal, so that the power supply diagnosis circuit returns the target diagnosis feedback signal to the controller through the target feedback terminal. Furthermore, if the voltage of the target diagnosis feedback signal is not greater than the second preset voltage, the controller can determine that there is a short-to-ground fault in the coil loop or the relay diagnosis circuit. It can be seen that in the embodiment of the present application, the controller can quickly and accurately determine whether there is a short-to-ground fault in the coil loop or the relay diagnosis circuit by combining the target drive signal and the target diagnosis feedback signal.

[0263] In some embodiments, the controller 2 of the embodiment of the present application can also be used for: 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 except the target diagnostic branch is not less than the first preset voltage, it can be 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 diagnostic circuit.

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

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

[0266] It can be seen that in the embodiment of the present application, the controller can quickly and accurately determine whether there is a short circuit fault between the power supply end of the coil loop and the power supply end 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, Fig.16 This is a schematic diagram of the structure of the energy storage system provided by other embodiments of the present application. Based on the above embodiments, the present embodiment takes the relay including the relay diagnostic circuit 13 and the coil loop 10 as an example to exemplarily introduce and explain the relevant contents of the first diagnostic branch 50 and the second diagnostic branch 51. Fig.16 As shown, the first diagnostic branch 50 in the embodiment of the present application may include a first diagnostic switch K1 connected in series with a detection power source Pd, a first pull-up resistor Ru1 , a first pull-down resistor Rd1 , and a second pull-down resistor Rd2 .

[0268] Exemplarily, the driving end of the first diagnostic switch K1 (or the first driving end of the power supply diagnostic circuit 5) can be connected to the first driving enable end 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 end of the power supply diagnostic circuit 5) can be respectively connected to the power supply ends of the first driving circuit 40 and the coil loop 10, and the connection point between the first pull-down resistor Rd1 and the second pull-down resistor Rd2 (or the first feedback end of the first diagnostic branch 50) can be connected to the first diagnostic end of the controller 2.

[0269] It should be understood that Fig.16 In the figure, the first drive enable terminal is port GPIO6 and the first diagnostic terminal is port ADC3 as an example. Of course, the first drive enable terminal or the first diagnostic terminal can also be other ports in the controller, which is not limited in the embodiments of the present application.

[0270] It can be seen that in the embodiment of the present application, the power supply end of the coil loop 10 can be connected to the detection power supply Pd through the first pull-up resistor Ru1 and the first diagnostic switch K1, and the power supply end of the coil loop 10 can also be connected to the ground GND through the first pull-down resistor Rd1 and the second pull-down resistor Rd2 connected in series. Among them, the driving end of the first diagnostic switch K1 can be connected to the port GPIO6 of the controller 2, so that the port GPIO6 of the controller 2 can output a first driving 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 port ADC3 of the controller 2, so that the first diagnostic feedback signal can be sent to the controller 2.

[0271] In the embodiment of the present application, 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] Exemplarily, the driving end of the second diagnostic switch K2 (or the second driving end of the power supply diagnostic circuit 5) can be connected to the second driving enable end 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 end of the power supply diagnostic circuit 5) can be connected to the power supply ends 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 end of the first diagnostic branch 51) can be connected to the second diagnostic end of the controller 2.

[0273] It should be understood that Fig.16 In the figure, the second drive enable terminal is port GPIO7 and the second diagnostic terminal is port ADC4 as an example. Of course, the second drive enable terminal or the second diagnostic terminal can also be other ports in the controller, which is not limited in the embodiments of the present application.

[0274] It can be seen that in the embodiment of the present application, the power supply end of the relay diagnostic circuit 13 can be connected to the detection power supply Pd through the second pull-up resistor Ru2 and the second diagnostic switch K2, and the power supply end of the relay diagnostic circuit 13 can also be connected to GND through the third pull-down resistor Rd3 and the fourth pull-down resistor Rd4 connected in series. Among them, the driving end of the second diagnostic switch K2 can be connected to the port GPIO7 of the controller 2, so that the port GPIO7 of the controller 2 can output a second driving 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 Rd can be connected to the port ADC4 of the controller 2, so that the second diagnostic feedback signal can be sent to the controller 2.

[0275] In some embodiments, Fig.17A schematic diagram of a flow chart of a power supply short circuit detection method for an energy storage system provided in some embodiments of the present application. Based on the above embodiments, for ease of understanding, the following embodiments of the present application are combined with Fig.16 The energy storage system shown in the figure is used to exemplarily introduce and explain the power supply short circuit detection method of the energy storage system. Fig.17 As shown, the method of the embodiment of the present application may include the following steps:

[0276] Step S1701: low voltage power-on of the controller is completed.

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

[0278] Step S1703: The controller determines whether the voltage of the first driving signal and the voltage of the second driving signal are both less than a 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, 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, step S1705 is executed.

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

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

[0282] Exemplarily, the controller may send a second driving signal to a driving end of the second diagnostic switch K2 via the second driving enable end to control the second diagnostic switch K2 to be in a closed state.

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

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

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

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

[0287] Exemplarily, the controller may send a first driving signal to a driving end of the first diagnostic switch K1 via the first driving enable end to control the first diagnostic switch K1 to be in a closed state.

[0288] Exemplarily, the controller may control the second diagnostic switch K2 to be in the disconnected state by not sending the second drive signal to the drive end of the second diagnostic switch K2 via the second drive enable end; of course, the controller may also control the second diagnostic switch K2 to be in the disconnected state in other ways.

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

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

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

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

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

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

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

[0296] Exemplarily, the controller may control the first diagnostic switch K1 to be in the disconnected state by not sending the first driving signal to the driving end of the first diagnostic switch K1 via the first driving enable end; of course, the controller may also control the first diagnostic switch K1 to be in the disconnected state in other ways.

[0297] Step S1714: the controller passes the power supply short circuit detection and waits for the high voltage process to be executed.

[0298] In the embodiment of the present application, the controller starts to execute the above power supply short circuit detection process after the low voltage is powered on. The controller can control the relay to supply high voltage only after the power supply short circuit detection is passed, which is beneficial to further protect the relay and / or electrical equipment.

[0299] For the implementation methods of each step in the embodiments of the present application, reference can be made to the relevant contents in the above embodiments and will not be repeated here.

[0300] In some embodiments, Fig.18The flowchart of the control method of the relay provided in some embodiments of the present application is shown in FIG. The method of the embodiment of the present application can be applied to the relay in the above embodiment of the present application. For the implementation method of the relay, reference can be made to the relevant contents in the above embodiment, which will not be repeated here. Fig.18 As shown, the method of the embodiment of the present application 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 contacts in the relay are located, and sends the current of the main circuit to the relay diagnosis circuit.

[0302] Step S1802: When the current of the main circuit is greater than the 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 contacts to switch to an open state.

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

[0304] The auxiliary contact sends a state diagnosis signal of the auxiliary contact to the relay diagnosis circuit; wherein the state diagnosis signal of the auxiliary contact is used to indicate the open or closed state of the auxiliary contact;

[0305] The relay diagnosis circuit determines the open and closed state of the auxiliary contact according to the state diagnosis signal; wherein the open and closed state of the auxiliary contact is used to indicate the open and closed state of the main circuit contact.

[0306] In some embodiments, the auxiliary contact is a mirror contact 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 terminal of the relay diagnostic circuit is further connected to the controller; the method further comprises:

[0308] The relay diagnosis circuit outputs a relay state diagnosis signal to the controller based on the open and closed state of the auxiliary contact, wherein the relay state diagnosis signal is used to indicate the open and closed state of the main circuit contact.

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

[0310] The auxiliary contact diagnosis module outputs a relay status diagnosis signal to the controller based on the open and closed status of the auxiliary contacts.

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

[0312] The relay diagnosis circuit 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.

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

[0314] When the current of the main circuit is greater than the preset current, the overcurrent diagnosis module sends an overcurrent diagnosis signal to the fault processing module;

[0315] The fault processing module controls the coil circuit to switch to a disconnected state according to the overcurrent diagnosis signal, and outputs a relay fault state signal to the controller.

[0316] For the relevant contents of the relay control method provided in the embodiment of the present application, reference can be made to the technical solutions in the above-mentioned relay embodiments of the present application. The implementation principles and technical effects are similar and will not be repeated here.

[0317] In some embodiments, Fig.19 The following is a flow chart of a control method for an energy storage system provided in some embodiments of the present application. The method of the embodiments of the present application can be applied to the energy storage system in the above embodiments of the present application. For the implementation of the energy storage system, please refer to the relevant contents in the above embodiments, which will not be repeated here. Fig.19 As shown, the method of the embodiment of the present application may include the following steps:

[0318] Step S1901: The processor obtains a relay state diagnosis signal and a relay fault state signal sent by a relay diagnosis circuit in the energy storage system.

[0319] Among them, the relay status diagnosis signal is used to indicate the open and closed 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 the relay has an overcurrent condition.

[0320] Step S1902: The processor determines whether the relay is faulty according to the relay fault state signal and / or the relay state diagnosis signal.

[0321] In some embodiments, the processor determines whether the relay is faulty according to the relay fault state signal and / or the relay state diagnosis signal, which may include:

[0322] When the control main circuit contacts are in a closed state, if the relay status diagnosis signal is used to indicate that the main circuit contacts are in an open state, it is determined that the relay has a failure to close.

[0323] In some embodiments, the processor determines whether the relay is faulty according to the relay fault state signal and / or the relay state diagnosis signal, which may include:

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

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

[0326] The controller controls the main circuit contacts to be in the disconnected state.

[0327] In some embodiments, the processor determines whether the relay is faulty according to the relay fault state signal and / or the relay state diagnosis signal, which may include:

[0328] When the main circuit contact in the control relay is in an open state, if the relay state diagnosis signal is used to indicate that the main circuit contact is in a closed state, it is determined that the relay has an inability to disconnect fault or a relay control circuit fault.

[0329] In some embodiments, the energy storage system further comprises: a high voltage sampling loop connected to the controller; and the method further comprises:

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

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

[0332] If the voltage difference indicates that the main circuit contacts are in an open state, the controller determines 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, the controller determines that there is a relay failure that cannot be disconnected.

[0333] 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; and the method further includes:

[0334] The controller controls the opening and closing state of the driving circuit to control whether the power supply supplies power to the power supply end of the relay.

[0335] In some embodiments, the drive circuit includes: a first drive circuit and a second drive circuit, the power supply includes a first power supply and a second power supply, and the power supply end of the coil loop in the relay is connected to the first power supply enable end of the controller and the first power supply through the first drive circuit;

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

[0337] The controller controls the opening and closing state of the driving circuit to control whether the power supply supplies power to the power supply end of the relay, which may include:

[0338] The opening and closing state of the first drive 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 drive 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 diagnosis circuit connected to the controller, wherein a power supply end of the power supply diagnosis circuit is connected to a detection power supply, a first transmission end of the power supply diagnosis circuit is respectively connected to power supply ends of the first drive circuit and the coil loop, and a second transmission end of the power supply diagnosis circuit is respectively connected to power supply ends of the second drive circuit and the relay diagnosis circuit; the method further includes:

[0340] The power supply diagnosis circuit adjusts the operation state under the control of the driving signal of the controller and returns a diagnosis feedback signal to the controller;

[0341] The controller determines the power supply short circuit condition of the coil loop and the relay diagnosis circuit according to the drive signal and / or the diagnosis feedback signal.

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

[0343] The controller determines the power supply short circuit of the coil loop and the relay diagnostic circuit according to the drive signal and / or the diagnostic return 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, it is determined that a short power fault exists in the coil loop or the relay diagnostic circuit.

[0345] In some embodiments, the power supply diagnostic circuit includes a first diagnostic branch and a second diagnostic branch, the first return detection end of the first diagnostic branch is connected to the first diagnostic end of the controller, and the second return detection end of the second diagnostic branch is connected to the second diagnostic end of the controller; determining the power supply short circuit of the coil loop and the relay diagnostic circuit according to the drive signal and / or the diagnostic return detection signal may include:

[0346] 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 the first preset voltage, the controller controls the target diagnosis branch in the power supply diagnosis circuit to adjust the operation 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 diagnosis branch is the first diagnosis branch or the second diagnosis branch;

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

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

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

[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 except the target diagnostic branch is not less than the first preset voltage, the controller determines that there is a short circuit fault between the power supply end of the coil loop and the power supply end 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 driving end of the first diagnostic switch is connected to the first driving enable end of the controller, the connection point between the first pull-up resistor and the first pull-down resistor is respectively connected to the power supply end of the first driving circuit and the coil loop, and the connection point between the first pull-down resistor and the second pull-down resistor is connected to the first diagnostic end 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 driving end of the second diagnostic switch is connected to the second driving enable end of the controller, the connection point between the second pull-up resistor and the third pull-down resistor is respectively connected to the power supply end of the second driving circuit and the relay diagnostic circuit, and the connection point between the third pull-down resistor and the fourth pull-down resistor is connected to the second diagnostic end of the controller.

[0355] For the relevant contents of the control method of the energy storage system provided in the embodiment of the present application, reference can be made to the technical solutions in the above-mentioned energy storage system embodiment of the present application, and the implementation principles and technical effects thereof are similar and will not be described in detail here.

[0356] In some embodiments, an embodiment of the present application provides an electrical device, which may include the energy storage system provided in the above-mentioned embodiment of the present application. Its implementation principle and technical effect are similar and will not be repeated here.

[0357] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0358] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A relay, characterized in that: The relay comprises: a coil loop, a main loop contact, a current detection component and a relay diagnostic circuit located inside the relay, the output end of the current detection component is connected to the input end of the relay diagnostic circuit, and the output end of the relay diagnostic circuit is respectively connected to the coil loop and a controller in the energy storage system; The current detection component is 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; 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, and output a relay fault state signal to the controller based on the current of the main circuit, wherein the relay fault state signal is used to indicate whether the relay has an overcurrent condition.

2. The relay according to claim 1, characterized in that: The relay diagnostic circuit comprises: an overcurrent diagnostic module and a fault processing module; wherein the input end of the overcurrent diagnostic module is connected to the output end of the current detection component, the output end of the overcurrent diagnostic module is connected to the input end of the fault processing module, and the output end of the fault processing module is connected to the coil loop and the controller respectively; The overcurrent diagnosis module is used to send an overcurrent diagnosis signal to the fault processing module when the current of the main circuit is greater than the preset current; The fault processing module is used to control the coil loop to switch to a disconnected state according to the overcurrent diagnosis signal, and output the relay fault state signal to the controller.

3. The relay according to claim 1 or 2, characterized in that: The relay further comprises an auxiliary contact located inside the relay and connected to the main circuit contact, wherein an output end of the auxiliary contact is connected to an input end of the relay diagnostic circuit; The auxiliary contact is used to send a state diagnosis signal of the auxiliary contact to the relay diagnosis circuit; wherein the state diagnosis signal of the auxiliary contact is used to indicate the open or closed state of the auxiliary contact; The relay diagnostic circuit is also used to determine the opening and closing state of the auxiliary contact according to the state diagnostic signal, and output a relay state diagnostic 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 to indicate the opening and closing state of the main circuit contact, and the relay state diagnostic signal is used to indicate the opening and closing state of the main circuit contact.

4. The relay according to claim 3, characterized in that: The auxiliary contact is a mirror image contact 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.

5. The relay according to claim 3 or 4, characterized in that: The relay diagnostic circuit comprises: an auxiliary contact diagnostic module, wherein an input end of the auxiliary contact diagnostic module is connected to an output end of the auxiliary contact, and an output end of the auxiliary contact diagnostic module is connected to the controller; The auxiliary contact diagnosis module is used to output the relay state diagnosis signal to the controller based on the open and closed state of the auxiliary contact.

6. An energy storage system, characterized in that: The energy storage system comprises a relay as claimed in any one of claims 1 to 5, and a controller connected to the relay; wherein the controller is used for: Obtaining a relay fault status signal sent by a relay diagnostic circuit in the relay; wherein the relay fault status signal is used to indicate whether the relay has an overcurrent condition; Determine whether the relay is faulty according to the relay fault state signal.

7. The energy storage system according to claim 6, characterized in that: The controller is specifically used for: If the relay fault state signal is used to indicate that the relay has an overcurrent condition, it is determined that the relay has an overcurrent fault or the relay control circuit has a fault.

8. The energy storage system according to claim 7, characterized in that: The controller is also used for: Acquire a relay state diagnosis signal sent by a relay diagnosis circuit in the relay; wherein the relay state diagnosis signal is used to indicate the open and closed state of the main circuit contacts in the relay; It is determined whether the relay is faulty according to the relay status diagnosis signal.

9. The energy storage system according to claim 8, characterized in that: The controller is specifically used for: In the case where the main circuit contact is controlled to be in a closed state, if the relay state diagnosis signal is used to indicate that the main circuit contact is in an open state, it is determined that the relay has a failure to close.

10. The energy storage system according to claim 8, characterized in that: The controller is specifically used for: When the main circuit contact in the relay is controlled to be in an open state, if the relay state diagnosis signal is used to indicate that the main circuit contact is in a closed state, it is determined that the relay has an inability to disconnect fault or the relay control circuit has a fault.

11. The energy storage system according to claim 10, characterized in that: The energy storage system further comprises: 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 contact and send the voltage difference to the controller; The controller is also used for: Determining the open and closed state of the main circuit contact according to the voltage difference; If the voltage difference indicates that the main circuit contact is in an open state, it is determined that there is a fault in the relay control circuit; If the voltage difference indicates that the main circuit contact is in a closed state, it is determined that the relay has a failure to disconnect.

12. The energy storage system according to any one of claims 8 to 11, characterized in that: If the relay has an overcurrent fault or the relay control circuit fails, the relay status diagnostic signal is used to indicate that the main circuit contact is in a closed state, and the controller is further used to control the main circuit contact to be in an open state.

13. The energy storage system according to any one of claims 8 to 12, characterized in that: The energy storage system further includes a drive circuit and a power supply diagnostic circuit; wherein the drive enable end of the controller is connected to the drive end of the power supply diagnostic circuit, the power supply enable end of the controller is connected to the power supply end of the relay through the drive circuit and the transmission end of the power supply diagnostic circuit, and the return detection end of the power supply diagnostic circuit is connected to the diagnostic end of the controller; Wherein, the controller is further used for: sending a driving signal to the power supply diagnosis circuit through the driving enable terminal; The power supply diagnosis circuit is used to adjust the operating state according to the driving signal and return a diagnostic feedback signal to the controller through the feedback terminal; The controller is further used to determine a power supply short circuit condition of the relay according to the drive signal and / or the diagnosis feedback signal.

14. The energy storage system according to claim 13, characterized in that: If the relay includes a coil loop and a relay diagnostic circuit, the drive circuit includes a first drive circuit and a second drive circuit, the first power supply enable terminal of the controller is connected to the power supply terminal of the coil loop through the first drive circuit and the first transmission terminal of the power supply diagnostic circuit; the second power supply enable terminal of the controller is connected to the power supply terminal of the relay diagnostic circuit through the second drive circuit and the second transmission terminal of the power supply diagnostic circuit; The first driving enable terminal of the controller is connected to the first driving terminal of the power supply diagnosis circuit, and the second driving enable terminal of the controller is connected to the second driving terminal of the power supply diagnosis circuit; The controller is specifically used to determine that a short power fault exists in the coil loop or the relay diagnostic circuit 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 a first preset voltage.

15. The energy storage system according to claim 14, characterized in that: The power supply diagnosis circuit comprises a first diagnosis branch and a second diagnosis branch, wherein a first return detection end of the first diagnosis branch is connected to a first diagnosis end of the controller, and a second return detection end of the second diagnosis branch is connected to a 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 terminal and the voltage of the second drive signal of the second drive enable terminal are both less than the first preset voltage, send a target drive signal to the power supply diagnosis circuit through a target drive enable terminal; wherein the target drive enable terminal is the first drive enable terminal or the second drive enable terminal; The power supply diagnostic circuit is specifically used to: adjust the operating state of the target diagnostic branch in the power supply diagnostic circuit according to the target drive signal, and return a target diagnostic feedback signal to the controller through the target feedback terminal; wherein the target diagnostic branch is the first diagnostic branch or the second diagnostic branch, the target feedback terminal is the first feedback terminal or the second feedback terminal, and the target diagnostic feedback signal is used to indicate the voltage of the target feedback terminal; The controller is also used to: if the voltage of the target diagnosis feedback signal is not greater than a second preset voltage, determine that a short-to-ground fault exists in the coil loop or the relay diagnosis circuit.

16. The energy storage system according to claim 15, characterized in that: The controller is also used for: 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 except the target diagnostic branch is not less than the first preset voltage, it is determined that a short circuit fault exists between the power supply end of the coil loop and the power supply end of the relay diagnostic circuit.

17. The energy storage system according to claim 15 or 16, characterized in that: 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 a detection power supply; The driving end of the first diagnostic switch is connected to the first driving enable end of the controller, the connection point between the first pull-up resistor and the first pull-down resistor is respectively connected to the power supply end of the first driving circuit and the coil loop, and the connection point between the first pull-down resistor and the second pull-down resistor is connected to the first diagnostic end of the controller.

18. The energy storage system according to claim 15 or 16, characterized in that: 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 end of the second diagnostic switch is connected to the second driving enable end of the controller, the connection point between the second pull-up resistor and the third pull-down resistor is respectively connected to the power supply end of the second driving circuit and the relay diagnostic circuit, and the connection point between the third pull-down resistor and the fourth pull-down resistor is connected to the second diagnostic end of the controller.

19. The energy storage system according to any one of claims 14 to 18, characterized in that: The controller is further used to: send a first enable signal to the first drive circuit through the first power supply enable terminal; The first drive circuit is used to adjust the on / off state of the first drive circuit according to the first enable signal to control whether the first power supply supplies power to the coil loop.

20. The energy storage system according to any one of claims 14 to 18, characterized in that: The controller is also used for: sending a second enable signal to the second driving circuit through the second power supply enable terminal; The second drive circuit is used to adjust the opening and closing state of the second drive circuit according to the second enable signal to control whether the second power supply supplies power to the relay diagnostic circuit.

21. A method for controlling a relay, characterized in that: The method is applied to the relay according to any one of claims 1 to 5, and the method comprises: The detection component in the relay collects the current of the main circuit where the main circuit contacts in the relay are located, and sends the current of the main circuit to the relay diagnosis circuit in the relay; 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, thereby controlling the main circuit contacts to switch to an open state, and outputs 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 the relay has an overcurrent condition.

22. A control method for an energy storage system, characterized in that: The method is applied to the energy storage system according to any one of claims 6 to 20, and the method comprises: The processor obtains a relay status diagnostic signal sent by a relay diagnostic circuit in the energy storage system; wherein the relay fault status signal is used to indicate whether the relay has an overcurrent condition; The processor determines whether the relay is faulty according to the relay fault state signal.

23. An electrical equipment, characterized in that: include: An energy storage system as claimed in any one of claims 6 to 20.

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