Dry contact feedback detection circuit and electric device

Abstract

The utility model belongs to the technical field of battery management, and relates to a dry contact feedback detection circuit, which comprises a dry contact module, a dry contact signal transmission module, a BMS module, a charging and discharging switch module and a battery module, and is characterized in that the dry contact module outputs a corresponding dry contact feedback signal to the dry contact signal transmission module according to the connection state of a power line; the dry contact signal transmission module is used for carrying out signal conversion and then transmitting the converted signal to the BMS module, and the BMS module is used for controlling the connection or disconnection of the charging and discharging switch module, so that the battery module carries out corresponding charging and discharging. The utility model further relates to a power utilization device. According to the technical scheme provided by the invention, high voltage can be ensured to be applied to the battery module under the condition that the dry contacts are closed, so that heating and sparking phenomena caused by virtual connection of a power line are avoided, and the energy storage safety is prevented from being influenced; the reliability of the whole system can be improved through dry contact detection, and the BMS module can quickly confirm the position of a fault point under the condition that virtual connection exists in a power line and the power line is not correctly plugged in place.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and more specifically, to a dry contact feedback detection circuit and an electrical device. Background Art

[0002] With the widespread application of large-scale energy storage systems, the safety of the entire energy storage system has gradually become particularly important. A battery energy storage system is a device or system based on a grid connection, used to store electricity and energy, and release energy when needed. It includes a battery module, a battery management system (BMS), a power conversion system (PCS), an energy management system (EMS), and other electrical equipment. Among them, the BMS, as the core control device, is mainly responsible for monitoring, protecting, and balancing the battery module. The EMS sends instructions to the PCS based on the battery information uploaded by the BMS. For example, the PCS can convert the DC power of the battery module into AC power and transmit it to the grid to achieve battery discharge, or convert the AC power of the grid into DC power for charging the battery module. Based on this, the access to the battery module end is crucial. When the power line is connected to the battery module end, it can only be detected by measuring the voltage of the battery module end to detect whether the power line is connected to the battery module end. It is impossible to determine whether the wiring is normal, and it is impossible to quickly and accurately confirm the location of the wiring fault point. Utility Model Content

[0003] The embodiments of the present application are to solve the technical problem that the existing method of using voltage measurement cannot determine whether the wiring connected to the battery module end is normal, and cannot quickly and accurately confirm the location of the wiring fault point.

[0004] In order to solve the above technical problems, the embodiment of the present application provides a dry contact feedback detection circuit, which adopts the following technical solution:

[0005] Dry contact module, dry contact signal transmission module, BMS module, charge and discharge switch module and charging module;

[0006] The dry contact module is connected to the dry contact signal transmission module and the charge-discharge switch module, and is used to insert a power line, and output a corresponding dry contact feedback signal to the dry contact signal transmission module according to the connection state of the power line;

[0007] The dry contact signal transmission module is connected to the BMS module and is used to convert the received dry contact feedback signal into a target communication signal and transmit it to the BMS module;

[0008] The BMS module is connected to the charge and discharge switch module, and is used to control the on or off of the charge and discharge switch module according to the target communication signal;

[0009] The charge and discharge switch module is respectively connected to the dry contact module, the battery module and the BMS module, and is used to control the charge and discharge state of the battery module;

[0010] The battery module is connected to the dry contact module through the charge and discharge switch module, and is used for charging when the charge and discharge switch module is turned on, and discharging when the charge and discharge switch module is turned off.

[0011] Furthermore, the dry contact module is provided with a power line female connector and a power line plug, and the power line female connector and the power line plug are correspondingly provided with a first dry contact, a second dry contact, a first power supply terminal and a second power supply terminal; the first dry contact and the second dry contact are used to be turned on when the power line is correspondingly connected to the power line female connector and the power line plug, and output a dry contact closing signal to the dry contact signal transmission module, and be disconnected when the power line is not connected to the power line female connector and the power line plug; the first power supply terminal is connected to the positive pole of the battery module through the charge and discharge switch module, and the second power supply terminal is connected to the negative pole of the battery module through the charge and discharge switch module.

[0012] Furthermore, the BMS module includes a connected BAU unit and a BCU unit, the BAU unit is connected to the dry contact module through the dry contact signal transmission module, and is used to receive a target communication signal sent by the dry contact signal transmission module, and generate a corresponding control signal according to the target communication signal; the BCU unit is connected to the charge and discharge switch module, and is used to control the conduction or disconnection of the charge and discharge switch module according to the control signal.

[0013] Furthermore, the charge and discharge switch module includes a positive contactor switch unit and a negative contactor switch unit; the positive contactor switch unit is arranged between the positive pole of the battery module and the first power supply terminal, and the negative contactor switch unit is arranged between the negative pole of the battery module and the second power supply terminal, and the positive contactor switch unit and the negative contactor switch unit are respectively connected to the BCU unit.

[0014] Further, the BCU unit includes a total voltage sampling subunit, a positive contactor feedback subunit, a negative contactor feedback subunit and a contactor constant connection detection subunit;

[0015] The total voltage sampling subunit is connected to the positive and negative poles of the battery module, and is used to collect the voltage of the battery module; the positive contactor feedback subunit is connected to the positive contactor switch unit, and is used to control the conduction or disconnection of the positive contactor switch unit according to the control signal; the negative contactor feedback subunit is connected to the negative contactor switch unit, and is used to control the conduction or disconnection of the negative contactor switch unit according to the control signal; the first channel interface of the contactor normally connected detection subunit is connected to the positive pole of the battery module, and the second channel interface of the contactor normally connected detection subunit is connected to the negative pole of the battery module, and is used to control the disconnection of the positive contactor switch unit when the control signal is a normally open signal.

[0016] Further, the positive contactor switch unit includes a first contactor and a first inductor, wherein the common connection point of the first normally open contact of the first contactor and the negative pole of the first inductor is connected to the first interface of the positive contactor feedback subunit; the first normally closed contact of the first contactor is connected to the third interface of the positive contactor feedback subunit; the positive pole of the first inductor is connected to the second interface of the positive contactor feedback subunit; the second normally open contact of the first contactor is connected to the positive pole of the battery module, and the second normally closed contact of the first contactor is connected to the first power supply terminal;

[0017] The negative contactor switch unit includes a second contactor and a second inductor, wherein the common connection point of the first normally open contact of the second contactor and the negative pole of the second inductor is connected to the first interface of the negative contactor feedback subunit; the first normally closed contact of the second contactor is connected to the third interface of the negative contactor feedback subunit; the positive pole of the second inductor is connected to the second interface of the negative contactor feedback subunit; the second normally open contact of the second contactor is connected to the negative pole of the battery module, and the second normally closed contact of the second contactor is connected to the second power supply terminal.

[0018] Furthermore, the charging and discharging switch module further includes a third contactor unit and a resistor, wherein the third contactor unit includes a third contactor and a third inductor; the BCU unit further includes a pre-charge contactor feedback subunit; wherein:

[0019] The common connection point of the first normally open contact of the third contactor and the second normally open contact of the first contactor is respectively connected to the positive electrode interface of the total voltage sampling subunit and the positive electrode of the battery module; the first normally closed contact of the third contactor is connected to the first end of the resistor; the second end of the resistor is connected to the second normally closed contact of the first contactor, the first channel interface of the contactor normally connected detection subunit and the first power supply end; the positive electrode of the third inductor is connected to the first interface of the pre-charge contactor feedback subunit; the negative electrode of the third inductor is connected to the second interface of the pre-charge contactor feedback subunit.

[0020] Furthermore, the charge and discharge switch module also includes a first fuse and a second fuse; the first end of the first fuse is connected to the positive electrode of the battery module, and the second end of the first fuse is connected to the positive electrode interface of the total voltage sampling subunit and the second normally open contact of the first contactor; the first end of the second fuse is connected to the negative electrode of the battery module, and the second end of the second fuse is connected to the negative electrode interface of the total voltage sampling subunit and the second normally open contact of the second contactor.

[0021] Furthermore, the charge and discharge switch module also includes an isolating switch, and the BCU unit also includes an isolating switch feedback subunit; the isolating switch includes a control switch, a first-stage switch and a second-stage switch; the normally closed contact of the control switch is connected to the first interface of the isolating switch feedback subunit, and the first normally open contact of the control switch is connected to the second interface of the isolating switch feedback subunit, for controlling the closing or disconnection of the first-stage switch and the second-stage switch; the normally closed contact of the first-stage switch is connected to the second normally closed contact of the second contactor, and the normally open contact of the first-stage switch is connected to the second power supply end; the normally closed contact of the second-stage switch is connected to the second normally closed contact of the first contactor, and the normally open contact of the second-stage switch is connected to the first power supply end.

[0022] In order to solve the above technical problems, the embodiment of the present application further provides an electric device, which adopts the following technical solution:

[0023] The electrical device includes the dry contact feedback detection circuit as described above.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The present application provides a dry contact feedback detection circuit, including a dry contact module, a dry contact signal transmission module, a BMS module and a charge and discharge switch module. The dry contact module outputs a corresponding dry contact feedback signal to the dry contact signal transmission module according to the connection status of the power line, and then the dry contact signal transmission module performs signal conversion and transmits it to the BMS module. The BMS module controls the conduction or disconnection of the charge and discharge switch module to enable the battery module to perform corresponding charging and discharging. The present application utilizes the connection of the dry contact signal detection circuit to ensure that the energy storage battery module is on high voltage when the dry contacts are all closed, thereby preventing heating and sparking caused by virtual connection of the power line, which affects the safety of energy storage. Secondly, through dry contact detection, the traditional voltage collection method to determine whether the power line is securely connected can be abandoned, thereby increasing the reliability of the entire system. At the same time, when the power line is virtual connected and not correctly plugged in, the BMS module can quickly confirm the location of the fault point and prevent the occurrence of power-on with virtual connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 is a structural block diagram of a dry contact feedback detection circuit provided in the present application;

[0028] Figure 2 is a circuit schematic diagram of an embodiment of a dry contact feedback detection circuit provided by the present application;

[0029] Figure 3 It is a circuit schematic diagram of another embodiment of the dry contact feedback detection circuit provided in the present application. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0033] The present application embodiment provides a dry contact feedback detection circuit, see Figure 1 As shown, it includes a dry contact module 1, a dry contact signal transmission module 2, a BMS module 3, a charge and discharge switch module 4 and a charging module 5. Among them, the dry contact module 1 is connected to the dry contact signal transmission module 2 and the charge and discharge switch module 4, and is used to insert the power line, and output the corresponding dry contact feedback signal to the dry contact signal transmission module 2 according to the connection state of the power line; the dry contact signal transmission module 2 is connected to the BMS module 3, and is used to convert the received dry contact feedback signal into a target communication signal and transmit it to the BMS module 3; the BMS module 3 is connected to the charge and discharge switch module 4, and is used to control the conduction or disconnection of the charge and discharge switch module 4 according to the target communication signal; the charge and discharge switch module 4 is respectively connected to the dry contact module 1, the battery module 5 and the BMS module 3, and is used to control the charge and discharge state of the battery module; the battery module 5 is connected to the dry contact module 1 through the charge and discharge switch module 4, and is used to charge when the charge and discharge switch module 4 is turned on, and to discharge when the charge and discharge switch module 4 is turned off.

[0034] In this embodiment, the power line is inserted into the dry contact module 1, and the connection status of the power line to the battery module 5 is judged by the connection status of the power line and the dry contact module 1, wherein the connection status of the power line includes connected and not connected. When the power line is connected to the dry contact module 1, it indicates that the power line is connected to the battery module 5, and high voltage can be applied to the battery module 5, that is, charging; when the power line is not connected to the dry contact module 1, it indicates that the power line is not connected to the battery module 5, and high voltage is prevented from being applied to the battery module 5, and preventing high voltage from being applied to the battery module 5 includes not charging the battery module 5 or allowing the battery module 5 to discharge.

[0035] The dry contact feedback detection circuit of the present application uses dry contact signals to detect the access status of the power line inserted into the battery module (PACK), which can ensure that the energy storage battery module is on high voltage when the dry contacts are closed, thereby eliminating the heating and sparking caused by the virtual connection of the power line, which affects the safety of energy storage; secondly, through dry contact detection, the detection and judgment of whether the power line is connected can be made more accurate and reliable, thereby increasing the reliability of the entire system. At the same time, in the case that the power line is virtual connected and not correctly plugged in, the BMS module can quickly confirm the location of the fault point and eliminate the occurrence of virtual connection power-on.

[0036] In some embodiments, see Figure 2 As shown, the dry contact module 1 is provided with a power line female connector and a power line plug, and the power line female connector and the power line plug are correspondingly provided with a first dry contact J1, a second dry contact J2, a first power supply terminal HV+ and a second power supply terminal HV-; the first dry contact J1 and the second dry contact J2 are used to be turned on or off according to the connection status of the power line. Specifically, when the power line is correspondingly connected to the power line female connector and the power line plug, the first dry contact J1 and the second dry contact J2 are turned on, and a dry contact closing signal is output to the dry contact signal transmission module 2; when the power line is not connected to the power line female connector and the power line plug, the first dry contact J1 and the second dry contact J2 are disconnected; the first power supply terminal HV+ is connected to the positive electrode BAT+ of the battery module 5 through the charge and discharge switch module 4, and the second power supply terminal HV- is connected to the negative electrode BAT- of the battery module 5 through the charge and discharge switch module 4.

[0037] The power line is connected to the battery module by inserting the power line female connector and the power line plug. The connection status of the power line includes the following working conditions:

[0038] Working condition 1: When the power line is inserted into the power line female connector and the power line plug, the first dry contact J1 and the second dry contact J2 enter the on state, and the output dry contact feedback signal is a dry contact closing signal. The dry contact closing signal is sent to the dry contact signal transmission module 2, and the dry contact signal transmission module 2 converts the dry contact closing signal into a target communication signal and transmits it to the BMS module 3;

[0039] Working condition 2: When the power line is inserted and there is a virtual connection (i.e., not connected), the BMS module 3 can detect the voltage signal, but the first dry contact J1 and / or the second dry contact J2 are not successfully connected, and the dry contact closing signal cannot be sent to the BMS module 3, then the energy storage cabinet is not allowed to apply high voltage, thereby protecting the battery module 5;

[0040] Working condition 3: When the BMS module 3 detects that the first dry contact J1 and the second dry contact J2 are dry contact normally open signals, it will actively disconnect the primary side high-voltage circuit to protect the high-voltage connector.

[0041] Among them, the target communication signal is converted according to the serial bus standard between the dry contact signal transmission module 2 and the BMS module 3. For example, the dry contact signal transmission module 2 and the BMS module 3 are connected via an RS-485 serial bus, and the dry contact closure signal is converted into a 485 signal and transmitted to the BMS module 3.

[0042] It should be understood that a dry contact is an electrical switch having two states: closed and open. There is no polarity between the two contacts in a dry contact and they can be interchanged.

[0043] In this embodiment, the access status of the power line is determined by whether the dry contact module can send a dry contact closure signal to the dry contact signal transmission module. When the power line is connected, high voltage can be allowed on the battery module. When the power line is loosely connected, high voltage is not allowed on the battery module. This can protect the battery module, thereby eliminating the heating and sparking caused by the loose connection of the power line, affecting the safety of energy storage, and improving the reliability of the system.

[0044] In some embodiments, the BMS module 3 includes a connected BAU unit 31 and a BCU unit 32. The BAU unit 31 is connected to the dry contact module 1 through the dry contact signal transmission module 2, and is used to receive the target communication signal sent by the dry contact signal transmission module 2, and generate a corresponding control signal according to the target communication signal; the BCU unit 32 is connected to the charge and discharge switch module 4, and is used to control the conduction or disconnection of the charge and discharge switch module 4 according to the control signal.

[0045] Specifically, when the power line is inserted into the power line female connector and the power line plug, the target communication signal is the dry contact closing signal converted by the dry contact signal transmission module 2, and the BAU unit 31 receives the converted dry contact closing signal, generates a corresponding control signal and transmits it to the BCU unit 32, and the BCU unit 32 controls the charge and discharge switch module 4 to turn on, so that high voltage is on the battery module 5; when the power line is virtually connected, the BAU unit 31 cannot receive the dry contact closing signal and can only detect the voltage signal, then it generates a corresponding control signal according to the voltage signal and transmits it to the BCU unit 32, and the BCU unit 32 controls the charge and discharge switch module 4 to turn off, thereby preventing high voltage from occurring on the battery module 5.

[0046] In this embodiment, the BAU unit generates a corresponding control signal according to the received target communication signal and transmits it to the BCU unit. Then, the BCU unit controls the on or off of the charge and discharge switch module according to the control signal, which can further ensure that the energy storage battery module is at high voltage when all dry contacts are closed, thereby improving the safety and reliability of the system.

[0047] In some embodiments, see Figure 3As shown, the charge and discharge switch module 4 includes a positive contactor switch unit 41 and a negative contactor switch unit 42; the positive contactor switch unit 41 is arranged between the positive pole BAT+ of the battery module and the first power supply terminal HV+, and the negative contactor switch unit 42 is arranged between the negative pole BAT- of the battery module and the second power supply terminal HV-, and the positive contactor switch unit 41 and the negative contactor switch unit 42 are respectively connected to the BCU unit 32.

[0048] In this embodiment, the positive contactor switch unit 41 and the negative contactor switch unit 42 respectively control the conduction or disconnection of the positive and negative electrodes of the battery module, thereby improving the reliability of the battery module and protecting the battery module 5.

[0049] In some embodiments, the BCU unit 32 includes a total voltage sampling subunit 321 , a positive contactor feedback subunit 322 , a negative contactor feedback subunit 323 , and a contactor constant connection detection subunit 324 .

[0050] Among them, see Figure 3 As shown, the total voltage sampling subunit 321 is provided with a positive electrode interface J5-1 and a positive electrode interface J6-4, the positive electrode interface J5-1 is connected to the positive electrode BAT+ and the negative electrode BAT- of the battery module 5, and is used to collect the voltage of the battery module 5; the positive electrode contactor feedback subunit 322 is connected to the positive electrode contactor switch unit 41, and is used to control the conduction or disconnection of the positive electrode contactor switch unit 41 according to the control signal; the negative electrode contactor feedback subunit 323 is connected to the negative electrode contactor switch unit 42, and is used to control the conduction or disconnection of the negative electrode contactor switch unit 42 according to the control signal; the first channel interface HV_CH1 of the contactor normally connected detection subunit 324 is connected to the positive electrode BAT+ of the battery module 5, and the second channel interface HV_CH2 of the contactor normally connected detection subunit 324 is connected to the negative electrode BAT- of the battery module 5, and is used to control the disconnection of the positive electrode contactor switch unit 41 when the control signal is a normally open signal.

[0051] In this embodiment, by setting corresponding signal feedback units such as the positive contactor feedback subunit, the negative contactor feedback subunit and the contactor constant connection detection subunit, the output signal of the dry contact is guaranteed, the stability of the dry contact is guaranteed, and the reliability of controlling the conduction or disconnection of the charge and discharge switch module is improved.

[0052] In some embodiments, the positive contactor switch unit 41 includes a first contactor KM1 and a first inductor L1, and the common connection point of the first normally open contact a of the first contactor KM1 and the negative pole of the first inductor L1 is connected to the first interface J2-28 of the positive contactor feedback subunit 322; the first normally closed contact b of the first contactor KM1 is connected to the third interface J2-30 of the positive contactor feedback subunit 322; the positive pole of the first inductor L1 is connected to the second interface J2-6 of the positive contactor feedback subunit 322; the second normally open contact c of the first contactor KM1 is connected to the positive pole BAT+ of the battery module 5, and the second normally closed contact d of the first contactor KM1 is connected to the first power supply terminal HV+;

[0053] The negative pole contactor switch unit 42 includes a second contactor KM2 and a second inductor L2, the first normally open contact e of the second contactor KM2 and the common connection point of the negative pole of the second inductor L2 are connected to the first interface J2-27 of the negative pole contactor feedback subunit 323; the first normally closed contact f of the second contactor KM2 is connected to the third interface J2-31 of the negative pole contactor feedback subunit 323; the positive pole of the second inductor L2 is connected to the second interface J2-1 of the negative pole contactor feedback subunit 323; the second normally open contact m of the second contactor KM2 is connected to the negative pole BAT- of the battery module 5, and the second normally closed contact n of the second contactor KM2 is connected to the second power supply terminal HV-.

[0054] In this embodiment, the response speed and stability of the on-off control loop can be improved through the coordination of the contactor and the inductor.

[0055] In some embodiments, the charge-discharge switch module 4 further includes a third contactor unit 43 and a resistor R1, the third contactor unit 43 includes a third contactor KM3 and a third inductor L3; the BCU unit 32 further includes a pre-charge contactor feedback subunit 325; wherein:

[0056] The common connection point of the first normally open contact o of the third contactor KM3 and the second normally open contact c of the first contactor KM1 is respectively connected to the positive electrode interface J5-1 of the total voltage sampling subunit 321 and the positive electrode BAT+ of the battery module; the first normally closed contact p of the third contactor KM3 is connected to the first end of the resistor R1; the second end of the resistor R1 is connected to the second normally closed contact d of the first contactor KM1, the first channel interface HV_CH1 of the contactor normally connected detection subunit 324 and the first power supply terminal HV+; the positive electrode of the third inductor L3 is connected to the first interface J2-5 of the pre-charge contactor feedback subunit 325, and the negative electrode of the third inductor L3 is connected to the second interface J2-7 of the pre-charge contactor feedback subunit 325.

[0057] In this embodiment, by setting a pre-charging contactor feedback subunit, the high-voltage impact during power-on can be reduced, and the battery module and components in the circuit can be protected. At the same time, the use of a third contactor and a third inductor can improve the response speed and stability of pre-charging.

[0058] In some embodiments, the charge and discharge switch module 4 also includes a first fuse FU1 and a second fuse FU2; the first end of the first fuse FU1 is connected to the positive electrode BAT+ of the battery module 5, and the second end of the first fuse FU1 is connected to the positive electrode interface J5-1 of the total voltage sampling subunit 321 and the second normally open contact c of the first contactor KM1; the first end of the second fuse FU is connected to the negative electrode BAT- of the battery module 5, and the second end of the second fuse FU2 is connected to the positive electrode interface J6-4 of the total voltage sampling subunit 321 and the second normally open contact m of the second contactor KM2.

[0059] The fuse can protect the circuit and further improve the safety and reliability of the system operation.

[0060] In some embodiments, the charge and discharge switch module 4 also includes an isolating switch 44, and the BCU unit 32 also includes an isolating switch feedback subunit 326; the isolating switch 44 includes a control switch 441, a first-stage switch 442, and a second-stage switch 443; the normally closed contact s of the control switch 441 is connected to the first interface J4-1 of the isolating switch feedback subunit 326, and the first normally open contact q1 of the control switch 441 is connected to the second interface J3-1 of the isolating switch feedback subunit 326, which is used to control the closing or disconnection of the first-stage switch 442 and the second-stage switch 443; the normally closed contact of the first-stage switch 442 is connected to the second normally closed contact n of the second contactor KM2, and the normally open contact of the first-stage switch 442 is connected to the second power supply terminal HV-; the normally closed contact of the second-stage switch 443 is connected to the second normally closed contact d of the first contactor KM1, and the normally open contact of the second-stage switch 443 is connected to the first power supply terminal HV+.

[0061] This embodiment separates the battery module and the dry contact module by setting an isolating switch, which can ensure that the energy storage battery module is on high voltage when the dry contacts are all closed, avoiding heating and sparking caused by virtual connection of the power line, and ensuring the safety of the battery module.

[0062] The present application also provides an electrical device, which includes the dry contact feedback detection circuit as described above. Use of the electrical device can increase the reliability of the entire system. At the same time, in the event that the power line has a false connection and is not correctly plugged in, the location of the fault point can be quickly confirmed, and the occurrence of false connection power-on can be prevented, thereby ensuring safe operation of the system.

[0063] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A dry contact feedback detection circuit, characterized in that: include: Dry contact module, dry contact signal transmission module, BMS module, charge and discharge switch module and battery module; The dry contact module is connected to the dry contact signal transmission module and the charge-discharge switch module, and is used to insert a power line, and output a corresponding dry contact feedback signal to the dry contact signal transmission module according to the connection state of the power line; The dry contact signal transmission module is connected to the BMS module and is used to convert the received dry contact feedback signal into a target communication signal and transmit it to the BMS module; The BMS module is connected to the charge and discharge switch module, and is used to control the on or off of the charge and discharge switch module according to the target communication signal; The charge and discharge switch module is respectively connected to the dry contact module, the battery module and the BMS module, and is used to control the charge and discharge state of the battery module; The battery module is connected to the dry contact module through the charge and discharge switch module, and is used for charging when the charge and discharge switch module is turned on, and discharging when the charge and discharge switch module is turned off.

2. The dry contact feedback detection circuit according to claim 1, characterized in that: The dry contact module is provided with a power line female connector and a power line plug, and the power line female connector and the power line plug are correspondingly provided with a first dry contact, a second dry contact, a first power supply terminal and a second power supply terminal; the first dry contact and the second dry contact are used to be turned on when the power line is correspondingly connected to the power line female connector and the power line plug, and output a dry contact closing signal to the dry contact signal transmission module, and be disconnected when the power line is not connected to the power line female connector and the power line plug; the first power supply terminal is connected to the positive pole of the battery module through the charge and discharge switch module, and the second power supply terminal is connected to the negative pole of the battery module through the charge and discharge switch module.

3. The dry contact feedback detection circuit according to claim 2, characterized in that: The BMS module includes a connected BAU unit and a BCU unit. The BAU unit is connected to the dry contact module through the dry contact signal transmission module, and is used to receive a target communication signal sent by the dry contact signal transmission module, and generate a corresponding control signal according to the target communication signal; the BCU unit is connected to the charge and discharge switch module, and is used to control the conduction or disconnection of the charge and discharge switch module according to the control signal.

4. The dry contact feedback detection circuit according to claim 3, characterized in that: The charge and discharge switch module includes a positive contactor switch unit and a negative contactor switch unit; the positive contactor switch unit is arranged between the positive pole of the battery module and the first power supply terminal, and the negative contactor switch unit is arranged between the negative pole of the battery module and the second power supply terminal, and the positive contactor switch unit and the negative contactor switch unit are respectively connected to the BCU unit.

5. The dry contact feedback detection circuit according to claim 4, characterized in that: The BCU unit includes a total voltage sampling subunit, a positive contactor feedback subunit, a negative contactor feedback subunit and a contactor constant connection detection subunit; The total voltage sampling subunit is connected to the positive and negative poles of the battery module, and is used to collect the voltage of the battery module; the positive contactor feedback subunit is connected to the positive contactor switch unit, and is used to control the conduction or disconnection of the positive contactor switch unit according to the control signal; the negative contactor feedback subunit is connected to the negative contactor switch unit, and is used to control the conduction or disconnection of the negative contactor switch unit according to the control signal; the first channel interface of the contactor normally connected detection subunit is connected to the positive pole of the battery module, and the second channel interface of the contactor normally connected detection subunit is connected to the negative pole of the battery module, and is used to control the disconnection of the positive contactor switch unit when the control signal is a normally open signal.

6. The dry contact feedback detection circuit according to claim 5, characterized in that: The positive contactor switch unit includes a first contactor and a first inductor, wherein a common connection point of a first normally open contact of the first contactor and a negative pole of the first inductor is connected to a first interface of the positive contactor feedback subunit; a first normally closed contact of the first contactor is connected to a third interface of the positive contactor feedback subunit; a positive pole of the first inductor is connected to a second interface of the positive contactor feedback subunit; a second normally open contact of the first contactor is connected to a positive pole of the battery module, and a second normally closed contact of the first contactor is connected to the first power supply terminal; The negative contactor switch unit comprises a second contactor and a second inductor, wherein a common connection point of a first normally open contact of the second contactor and a negative pole of the second inductor is connected to a first interface of the negative contactor feedback subunit; a first normally closed contact of the second contactor is connected to a third interface of the negative contactor feedback subunit; and a positive pole of the second inductor is connected to a second interface of the negative contactor feedback subunit; The second normally open contact of the second contactor is connected to the negative electrode of the battery module, and the second normally closed contact of the second contactor is connected to the second power supply terminal.

7. The dry contact feedback detection circuit according to claim 6, characterized in that: The charge and discharge switch module further includes a third contactor unit and a resistor, wherein the third contactor unit includes a third contactor and a third inductor; the BCU unit further includes a pre-charge contactor feedback subunit; wherein: The common connection point of the first normally open contact of the third contactor and the second normally open contact of the first contactor is respectively connected to the positive electrode interface of the total voltage sampling subunit and the positive electrode of the battery module; the first normally closed contact of the third contactor is connected to the first end of the resistor; the second end of the resistor is connected to the second normally closed contact of the first contactor, the first channel interface of the contactor normally connected detection subunit and the first power supply end; the positive electrode of the third inductor is connected to the first interface of the pre-charge contactor feedback subunit; the negative electrode of the third inductor is connected to the second interface of the pre-charge contactor feedback subunit.

8. The dry contact feedback detection circuit according to claim 6, characterized in that: The charge and discharge switch module also includes a first fuse and a second fuse; the first end of the first fuse is connected to the positive electrode of the battery module, and the second end of the first fuse is connected to the positive electrode interface of the total voltage sampling subunit and the second normally open contact of the first contactor; the first end of the second fuse is connected to the negative electrode of the battery module, and the second end of the second fuse is connected to the negative electrode interface of the total voltage sampling subunit and the second normally open contact of the second contactor.

9. The dry contact feedback detection circuit according to claim 6, characterized in that: The charge and discharge switch module also includes an isolating switch, and the BCU unit also includes an isolating switch feedback subunit; the isolating switch includes a control switch, a first-stage switch, and a second-stage switch; the normally closed contact of the control switch is connected to the first interface of the isolating switch feedback subunit, and the first normally open contact of the control switch is connected to the second interface of the isolating switch feedback subunit, for controlling the closing or disconnection of the first-stage switch and the second-stage switch; the normally closed contact of the first-stage switch is connected to the second normally closed contact of the second contactor, and the normally open contact of the first-stage switch is connected to the second power supply end; the normally closed contact of the second-stage switch is connected to the second normally closed contact of the first contactor, and the normally open contact of the second-stage switch is connected to the first power supply end.

10. An electrical device, characterized in that: The dry contact feedback detection circuit comprises the dry contact feedback detection circuit as described in any one of claims 1 to 9.

Images