Energy storage switch control circuit

Abstract

The utility model discloses an energy storage switch control circuit which comprises a battery, a PCS module, a control module, a first driving module, a first magnetic latching relay, a first detection module, a second driving module, a second magnetic latching relay and a second detection module. The positive electrode of the battery, the first magnetic latching relay and the PCS module are connected in sequence, and the negative electrode of the battery, the second magnetic latching relay and the PCS module are connected in sequence; the control module, the first driving module and the first magnetic latching relay are connected in sequence, and the control module, the second driving module and the second magnetic latching relay are connected in sequence; the first detection module is respectively connected with the control module and the first magnetic latching relay and is used for detecting the on-off state of the first magnetic latching relay; and the second detection module is respectively connected with the control module and the second magnetic latching relay and is used for detecting the on-off state of the second magnetic latching relay. According to the utility model, the stability of the relay can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management systems, in particular to an energy storage switch control circuit. Background Art

[0002] As the country's investment and support for new energy sources gradually increases, the energy storage industry has also ushered in good development opportunities. Battery energy storage technology has attracted much attention due to its high energy density, reliability and wide range of application scenarios.

[0003] At present, in the energy storage industry, MOS tubes are mostly used between BMS and PCS to directly control switches (such as contactors) for charging and discharging. In abnormal power-on and power-off or complex electromagnetic usage environments, abnormal switch operation may occur, leading to usage failures or even serious problems such as PCS explosion.

[0004] For such situations, the usual handling methods are as follows: 1. Add anti-interference devices to improve anti-interference capabilities; this mode has two main implementation methods: a. Add corresponding filtering circuits and devices on the corresponding circuit board of the BMS; b. Adjust the stacking of the circuit board to improve the anti-interference capability; 2. Add judgment logic. This mode is to establish complex communication between the BMS and PCS, and confirm the switch action by sending and receiving information multiple times.

[0005] The probability of problems can indeed be reduced by adding anti-interference devices, but the R&D and production costs are significantly increased, and the filtering capacity of the filter circuit is limited, resulting in insufficient stability. Although it is possible to avoid single abnormal actions by adding judgment logic, the risk is completely transferred to the stability of the software. This dependency is very fragile and the risk of problems is still high. Therefore, these methods in the prior art all have the key problem of how to maintain the stability of the switch. Utility Model Content

[0006] The utility model provides an energy storage switch control circuit, which can greatly improve the stability of the relay.

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] An embodiment of the utility model provides an energy storage switch control circuit, comprising a battery, a PCS module, a control module, a first drive module, a first magnetic latching relay, a first detection module, a second drive module, a second magnetic latching relay and a second detection module; the positive pole of the battery, the first magnetic latching relay and the PCS module are connected in sequence, and the negative pole of the battery, the second magnetic latching relay and the PCS module are connected in sequence; the control module, the first drive module and the first magnetic latching relay are connected in sequence, and the control module, the second drive module and the second magnetic latching relay are connected in sequence; the first detection module is respectively connected to the control module and the first magnetic latching relay, and is used to detect the switch state of the first magnetic latching relay; the second detection module is respectively connected to the control module and the second magnetic latching relay, and is used to detect the switch state of the second magnetic latching relay.

[0009] In some embodiments, the first detection module includes a first photocoupler, a tenth resistor and an eleventh resistor, the control module is connected to the positive output end of the first photocoupler, the DC power supply, the tenth resistor and the positive output end of the first photocoupler are connected in sequence, the negative output end of the first photocoupler is grounded, the DC power supply, the eleventh resistor and the positive input end of the first photocoupler are connected in sequence, the negative input end of the first photocoupler is connected to a feedback pin of the first magnetic latching relay, and the other feedback pin of the first magnetic latching relay is grounded.

[0010] In some embodiments, the second detection module includes a second photocoupler, a ninth resistor and a twelfth resistor; the control module is connected to the positive output end of the second photocoupler; the DC power supply, the ninth resistor and the positive output end of the second photocoupler are connected in sequence; the negative output end of the second photocoupler is grounded; the DC power supply, the twelfth resistor and the positive input end of the second photocoupler are connected in sequence; the negative input end of the second photocoupler is connected to a feedback pin of the second magnetic latching relay, and the other feedback pin of the second magnetic latching relay is grounded.

[0011] In some embodiments, the first driving module includes a first chip BL8032 and a first TVS diode, a DC power supply is connected to pin 5 of the first chip BL8032, pin 2 of the first chip BL8032 is grounded, pins 3 and 6 of the first chip BL8032 are both connected to the control module, pins 1 and 4 of the first chip BL8032 are respectively connected to two power supply terminals of the first magnetic holding relay, and two ends of the first TVS diode are respectively connected to pin 1 and pin 4 of the first chip BL8032.

[0012] In some embodiments, the second driving module includes a second chip BL8032 and a second TVS diode, a DC power supply is connected to pin 5 of the second chip BL8032, pin 2 of the second chip BL8032 is grounded, pins 3 and 6 of the second chip BL8032 are both connected to the control module, pins 1 and 4 of the second chip BL8032 are respectively connected to two power supply terminals of the second magnetic latching relay, and the two ends of the second TVS diode are respectively connected to pin 1 and pin 4 of the second chip BL8032.

[0013] In some embodiments, a first isolation protection module is connected in series between the control module and the first driving module, and a second isolation protection module is connected in series between the control module and the second driving module.

[0014] In some embodiments, the first isolation protection module includes a third photocoupler, and the second isolation protection module includes a fourth photocoupler.

[0015] In some embodiments, the control module includes a chip STM32F103.

[0016] The utility model has at least the following beneficial effects: when the controller receives an external control signal that requires changing the switch state of the relay, the controller will combine the switch states of the first magnetic latching relay and the second magnetic latching relay detected by the first detection module and the second detection module respectively to determine whether the switch state of the relay after the change is different from the switch state of the detected relay. If they are different, the first drive module and the second drive module will be controlled to drive the first magnetic latching relay and the second magnetic latching relay to change the switch state respectively. After the first magnetic latching relay and the second magnetic latching relay change the switch state, they can self-maintain the switch state without relying on logic circuits to control the relay latching state, and are not affected by external interference or accidental power-off or power-on, which greatly improves the stability of the relay and ensures the safety of other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a module schematic diagram of an energy storage switch control circuit according to an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the circuit structure of a first detection module in an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the circuit structure of a second detection module in one embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the circuit structure of a first driving module in one embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the circuit structure of a second driving module in one embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the circuit structure of a first isolation protection module according to an embodiment of the utility model;

[0023] Figure 7 The figure is a schematic diagram of the circuit structure of the second isolation protection module according to an embodiment of the utility model.

[0024] Wherein, the accompanying drawings are marked as follows:

[0025] The battery 100 , the PCS module 200 , the control module 300 , the first driving module 410 , the first magnetic latching relay 510 , the first detection module 610 , the second driving module 420 , the second magnetic latching relay 520 , and the second detection module 620 . DETAILED DESCRIPTION

[0026] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.

[0027] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.

[0029] The embodiment of the utility model provides an energy storage switch control circuit, such as Figure 1As shown, it includes a battery 100, a PCS module 200, a control module 300, a first driving module 410, a first magnetic latching relay 510, a first detection module 610, a second driving module 420, a second magnetic latching relay 520 and a second detection module 620. The PCS module 200 is used to convert the DC power of the battery 100 into AC power, and to convert the AC power from the power grid or other power generation sources into DC power to meet the charging and discharging requirements of the battery 100. The positive pole of the battery 100, the first magnetic latching relay 510 and the PCS module 200 are connected in sequence, and the first magnetic latching relay 510 controls the circuit between the positive pole of the battery 100 and the PCS module 200 to be turned on or off, and the negative pole of the battery 100, the second magnetic latching relay 520 and the PCS module 200 are connected in sequence, and the second magnetic latching relay 520 controls the circuit between the negative pole of the battery 100 and the PCS module 200 to be turned on or off.

[0030] The control module 300 can receive signals from other modules, and after data calculation and processing, send corresponding control instructions to other modules. The control module 100, the first drive module 410 and the first magnetic latching relay 510 are connected in sequence, and the control module 100, the second drive module 420 and the second magnetic latching relay 520 are connected in sequence. The control module 100 can send corresponding control instructions to the first drive module 410 and the second drive module 420 respectively. The first drive module 410 drives the first magnetic latching relay 510 to change the switch state according to the control instruction, and the second drive module 420 drives the second magnetic latching relay 520 to change the switch state according to the control instruction.

[0031] The first detection module 610 is connected to the control module 300 and the first magnetic holding relay 510 respectively, and the first detection module 610 is used to detect the switching state of the first magnetic holding relay 510 and send the detected switching state to the control module 300; the second detection module 620 is connected to the control module 300 and the second magnetic holding relay 520 respectively, and the second detection module 620 is used to detect the switching state of the second magnetic holding relay 520 and send the detected switching state to the control module 300.

[0032] When the controller 300 receives an external control signal that requires changing the switch state of the relay, the controller 300 will combine the switch states of the first magnetic holding relay 510 and the second magnetic holding relay 520 detected by the first detection module 610 and the second detection module 620 to determine whether the switch state of the relay after the change is different from the switch state of the detected relay. For example, when the external control signal wants to change the relay to the on state, but the relay is actually detected to be in the off state, the switch state of the relay after the change is different from the switch state of the detected relay. Similarly, when the external control signal wants to change the relay to the on state, but the relay is actually detected to be in the on state, the switch state of the relay after the change is the same as the switch state of the detected relay. If the two states are not the same, the first driving module 410 and the second driving module 420 are controlled to drive the first magnetic latching relay 510 and the second magnetic latching relay 520 to change the switch state respectively. After the first magnetic latching relay 510 and the second magnetic latching relay 520 change the switch state, they can maintain the switch state by themselves, without relying on the logic circuit to control the relay latch state, and are not affected by external interference or accidental power off and on, which greatly improves the stability of the relay and ensures the safety of other equipment. If it is determined that the two states are the same, there is no need to change the switch state of the relay. In this case, the control module 300 does not act.

[0033] In some embodiments, Figure 2 As shown, the first detection module includes a first photocoupler U7, a tenth resistor R10 and an eleventh resistor R11; the control module is connected to the positive output end of the first photocoupler, specifically, the FB1_MCU pin is connected to the 4th pin of the first photocoupler; the DC power supply, the tenth resistor and the positive output end of the first photocoupler are connected in sequence; the negative output end of the first photocoupler is grounded; the DC power supply, the eleventh resistor and the positive input end of the first photocoupler are connected in sequence; the negative input end of the first photocoupler is connected to a feedback pin of the first magnetic latching relay, and the other feedback pin of the first magnetic latching relay is grounded.

[0034] Some magnetic latching relays have two feedback pins for feedback of their switch status. The two feedback pins are dry contact type. When the switch status of the magnetic latching relay changes, the two feedback pins are connected or disconnected. As the conduction status between the two feedback pins changes, current will flow through or disconnect the input end of the first photocoupler, thereby changing the level signal of the output end, and the controller can know the switch status of the first magnetic latching relay. The use of photocouplers can isolate signal interference, ensure the accuracy of the feedback signal, and further improve the stability of the relay.

[0035] As for the magnetic latching relay with feedback pin, it is already in the prior art, and its specific structure will not be described in detail. For example, reference may be made to Chinese patent documents such as publication number CN115172103A.

[0036] In some embodiments, Figure 3 As shown, the second detection module includes a second photoelectric coupler U8, a ninth resistor R9 and a twelfth resistor R12; the control module is connected to the positive output end of the second photoelectric coupler, specifically, the FB2_MCU pin is connected to the 4th pin of the second photoelectric coupler, the DC power supply, the ninth resistor and the positive output end of the second photoelectric coupler are connected in sequence; the negative output end of the second photoelectric coupler is grounded; the DC power supply, the twelfth resistor and the positive input end of the second photoelectric coupler are connected in sequence; the negative input end of the second photoelectric coupler is connected to a feedback pin of the second magnetic latching relay, and the other feedback pin of the second magnetic latching relay is grounded.

[0037] Some magnetic latching relays have two feedback pins for feedback of their switch status. The two feedback pins are dry contact type. When the switch status of the magnetic latching relay changes, the two feedback pins are connected or disconnected. As the conduction status between the two feedback pins changes, current will flow through or disconnect the input end of the second photocoupler, thereby changing the level signal of the output end, and the controller can know the switch status of the second magnetic latching relay. The use of photocouplers can isolate signal interference, ensure the accuracy of the feedback signal, and further improve the stability of the relay.

[0038] In some embodiments, Figure 4 As shown, the first driving module includes a first chip BL8032 and a first TVS diode D1, the first chip BL8032 is U2 in the figure; a DC power supply is connected to pin 5 of the first chip BL8032 to supply power to the first chip BL8032 to make it work; pin 2 of the first chip BL8032 is grounded; pins 3 and 6 of the first chip BL8032 are both connected to the control module, pins 1 and 4 of the first chip BL8032 are respectively connected to the two power supply terminals of the first magnetic latching relay K1, and the two ends of the first TVS diode are respectively connected to pin 1 and pin 4 of the first chip BL8032.

[0039] The control module sends corresponding control signals to the 3rd and 6th pins of the first chip BL8032, and the first chip BL8032 changes the voltage of its 1st and / or 4th pins, so that the first magnetic latching relay changes its switch state. The first TVS diode is an overvoltage protector with bidirectional voltage stabilization characteristics and bidirectional negative resistance characteristics, which can improve the stability and safety of the voltage. The 5th pin of the first chip BL8032, the capacitor C1 and the ground terminal are connected in sequence to filter the power supply signal.

[0040] In some embodiments, Figure 5 As shown, the second driving module includes a second chip BL8032 and a second TVS diode D2, and the second chip BL8032 is U5 in the figure; a DC power supply is connected to pin 5 of the second chip BL8032 to supply power to the second chip BL8032 to make it work; pin 2 of the second chip BL8032 is grounded; pins 3 and 6 of the second chip BL8032 are both connected to the control module, pins 1 and 4 of the second chip BL8032 are respectively connected to the two power supply terminals of the second magnetic latching relay K2, and the two ends of the second TVS diode are respectively connected to pin 1 and pin 4 of the second chip BL8032.

[0041] The control module sends corresponding control signals to the 3rd and 6th pins of the second chip BL8032, and the second chip BL8032 changes the voltage of its 1st and / or 4th pins, so that the second magnetic latching relay changes its switch state. The second TVS diode is an overvoltage protector with bidirectional voltage stabilization characteristics and bidirectional negative resistance characteristics, which can improve the stability and safety of the voltage. The 5th pin of the second chip BL8032, the capacitor C2 and the ground terminal are connected in sequence to filter the power supply signal.

[0042] In some embodiments, a first isolation protection module is connected in series between the control module and the first driving module, and a second isolation protection module is connected in series between the control module and the second driving module. The first isolation protection module and the second isolation protection module can isolate and protect the control signal sent by the control module from external interference, thereby ensuring the accuracy of the control signal sent by the control module and further improving the stability of the relay.

[0043] Furthermore, the first isolation protection module includes a third photoelectric coupler, and the second isolation protection module includes a fourth photoelectric coupler.

[0044] like Figure 6 and Figure 7As shown, two third photocouplers and four photocouplers can be provided, and the DC power supply is connected to the positive output terminals of the two third photocouplers, the negative output terminal of one third photocoupler U1 is connected to the 6-pin of the first chip BL8032, the negative output terminal of the third photocoupler U1, the resistor R2 and the ground terminal are connected in sequence, the DC power supply, the resistor R1 and are connected in sequence to the positive input terminal of the third photocoupler U1, and the negative input terminal of the third photocoupler U1 is connected to the control module. The negative output terminal of the other third photocoupler U3 is connected to the 3-pin of the first chip BL8032, the negative output terminal of the third photocoupler U3, the resistor R4 and the ground terminal are connected in sequence, the DC power supply, the resistor R3 and are connected in sequence to the positive input terminal of the third photocoupler U3, and the negative input terminal of the third photocoupler U3 is connected to the control module.

[0045] The DC power supply is connected to the positive output ends of the two fourth photocouplers, the negative output end of one of the fourth photocouplers U4 is connected to the 6-pin of the second chip BL8032, the negative output end of the fourth photocoupler U4, the resistor R6 and the grounding end are connected in sequence, the DC power supply, the resistor R5 and the positive input end of the fourth photocoupler U4 are connected in sequence, and the negative input end of the fourth photocoupler U4 is connected to the control module. The negative output end of the other fourth photocoupler U6 is connected to the 3-pin of the second chip BL8032, the negative output end of the fourth photocoupler U6, the resistor R8 and the grounding end are connected in sequence, the DC power supply, the resistor R7 and the positive input end of the fourth photocoupler U6 are connected in sequence, and the negative input end of the fourth photocoupler U6 is connected to the control module.

[0046] In some embodiments, the control module includes a chip STM32F103.

[0047] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.

Claims

1. An energy storage switch control circuit, characterized in that: It includes a battery, a PCS module, a control module, a first drive module, a first magnetic latching relay, a first detection module, a second drive module, a second magnetic latching relay and a second detection module; the positive pole of the battery, the first magnetic latching relay and the PCS module are connected in sequence, and the negative pole of the battery, the second magnetic latching relay and the PCS module are connected in sequence; the control module, the first drive module and the first magnetic latching relay are connected in sequence, and the control module, the second drive module and the second magnetic latching relay are connected in sequence; the first detection module is respectively connected to the control module and the first magnetic latching relay, and is used to detect the switching state of the first magnetic latching relay; the second detection module is respectively connected to the control module and the second magnetic latching relay, and is used to detect the switching state of the second magnetic latching relay.

2. The energy storage switch control circuit according to claim 1, characterized in that: The first detection module includes a first photoelectric coupler, a tenth resistor and an eleventh resistor, the control module is connected to the positive output end of the first photoelectric coupler, the DC power supply, the tenth resistor and the positive output end of the first photoelectric coupler are connected in sequence, the negative output end of the first photoelectric coupler is grounded, the DC power supply, the eleventh resistor and the positive input end of the first photoelectric coupler are connected in sequence, the negative input end of the first photoelectric coupler is connected to a feedback pin of the first magnetic latching relay, and the other feedback pin of the first magnetic latching relay is grounded.

3. The energy storage switch control circuit according to claim 1, characterized in that: The second detection module includes a second photoelectric coupler, a ninth resistor and a twelfth resistor; the control module is connected to the positive output end of the second photoelectric coupler; the DC power supply, the ninth resistor and the positive output end of the second photoelectric coupler are connected in sequence; the negative output end of the second photoelectric coupler is grounded; the DC power supply, the twelfth resistor and the positive input end of the second photoelectric coupler are connected in sequence; the negative input end of the second photoelectric coupler is connected to a feedback pin of the second magnetic latching relay, and the other feedback pin of the second magnetic latching relay is grounded.

4. The energy storage switch control circuit according to any one of claims 1 to 3, characterized in that: The first driving module includes a first chip BL8032 and a first TVS diode, a DC power supply is connected to pin 5 of the first chip BL8032, pin 2 of the first chip BL8032 is grounded, pins 3 and 6 of the first chip BL8032 are both connected to the control module, pins 1 and 4 of the first chip BL8032 are respectively connected to two power supply ends of the first magnetic latching relay, and the two ends of the first TVS diode are respectively connected to pin 1 and pin 4 of the first chip BL8032.

5. The energy storage switch control circuit according to any one of claims 1 to 3, characterized in that: The second driving module includes a second chip BL8032 and a second TVS diode, a DC power supply is connected to pin 5 of the second chip BL8032, pin 2 of the second chip BL8032 is grounded, pins 3 and 6 of the second chip BL8032 are both connected to the control module, pins 1 and 4 of the second chip BL8032 are respectively connected to the two power supply ends of the second magnetic latching relay, and the two ends of the second TVS diode are respectively connected to pin 1 and pin 4 of the second chip BL8032.

6. The energy storage switch control circuit according to any one of claims 1 to 3, characterized in that: A first isolation protection module is connected in series between the control module and the first driving module, and a second isolation protection module is connected in series between the control module and the second driving module.

7. The energy storage switch control circuit according to claim 6, characterized in that: The first isolation protection module includes a third photoelectric coupler, and the second isolation protection module includes a fourth photoelectric coupler.

8. The energy storage switch control circuit according to any one of claims 1 to 3, characterized in that: The control module includes a chip STM32F103.

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