Intelligent high-voltage control switch applied to energy storage system

Abstract

The utility model provides an intelligent high-voltage control switch applied to an energy storage system. The intelligent high-voltage control switch comprises an intelligent switch controller and an intelligent switch power unit, the intelligent switch power unit is connected between a load and a battery cluster of the energy storage system and is used as a switch of a high-voltage loop between the battery cluster and the load; the intelligent switch controller is connected with the intelligent switch power unit and is used for monitoring the running state of the intelligent switch power unit and controlling the intelligent switch power unit; the intelligent switch controller comprises an MCU, a monitoring unit and a control unit. The monitoring unit is respectively connected with the MCU and the intelligent switch power unit and is used for acquiring running state data of the intelligent switch power unit and transmitting the running state data to the MCU; and the control unit is respectively connected with the MCU and the intelligent switch power unit and is used for receiving a control instruction sent by the MCU. Through the combination of the intelligent switch controller and the intelligent switch power unit, the working efficiency and reliability of the device are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery energy technology field, specifically related to a kind of intelligent high-voltage control switch applied to energy storage system. BACKGROUND

[0002] High-voltage box is a kind of equipment for high-voltage power transmission, distribution and control, usually with built-in sensors and monitoring devices, which can monitor the voltage, current, temperature and other parameters of the energy storage system in real time, and transmit these information to the control system, at the same time, high-voltage box also receives instructions from the control system, to charge, discharge, power regulation and other control operations of the energy storage system. According to the different application scenarios, high-voltage box can be divided into many types, such as energy storage high-voltage box, electric vehicle high-voltage distribution box, etc.

[0003] In the large storage and commercial energy storage projects of prior art, high-voltage box is usually used as DC side switch between battery cluster and PCS (load), as shown in Figure 3 The scheme contains discrete devices such as current sensor, main circuit contactor, pre-charge circuit contactor, pre-charge resistor, circuit breaker and fuse, and the switching collection of each part is realized by external main controller.

[0004] The main feature of the existing high-voltage box is that each discrete device is independent of each other, and there may be some abnormal cooperation, working strategy error or delay between devices, which is easy to cause device damage or some loss. Moreover, in the current energy storage products, high-voltage box is used as high-voltage switch, and the devices in high-voltage box are discrete devices, which are controlled by external controller, so the integration degree is low and the cost is high. INVENTION CONTENT

[0005] Therefore, the embodiment of the present specification provides an intelligent high-voltage control switch applied to energy storage system, which integrates the functions of high-voltage box and controller in the intelligent high-voltage control switch, to achieve the purpose of improving integration degree and reducing cost.

[0006] The embodiment of the present specification provides the following technical solutions:

[0007] An intelligent high-voltage control switch applied to energy storage system, comprising:

[0008] Intelligent switch controller and intelligent switch power unit;

[0009] The intelligent switch power unit is connected between the load and the battery cluster of the energy storage system, and is used as the switch of the high-voltage circuit between the battery cluster and the load;

[0010] The intelligent switch controller is connected with the intelligent switch power unit, for monitoring the running state of the intelligent high-voltage control switch and controlling the intelligent switch power unit;

[0011] The intelligent switch controller comprises an MCU controller, a monitoring unit and a control unit.

[0012] The monitoring unit is connected with the MCU controller and the intelligent switch power unit respectively, and is configured to collect operation state data of the intelligent high-voltage control switch and transmit the operation state data to the MCU controller.

[0013] The control unit is connected with the MCU controller and the intelligent switch power unit respectively, and is configured to receive a control instruction sent by the MCU controller, and the control instruction is configured to control the intelligent switch power unit.

[0014] Further, the monitoring unit comprises:

[0015] A current detection and arc detection circuit and a flame sensor circuit, and the current detection and arc detection circuit and the flame sensor circuit are connected to the intelligent switch power unit.

[0016] The current detection and arc detection circuit is configured to detect whether there is an arc between the battery cluster and the battery cluster and between the battery cluster and the ground, and transmit the detection result as operation state data to the MCU controller.

[0017] A current sensor, the current sensor is arranged in each battery cluster and is configured to detect a current value of the battery cluster.

[0018] The flame sensor circuit is configured to detect whether there is an arc light caused by too close distance or weak insulation of devices in the intelligent switch power unit or a misfire caused by short circuit of the devices.

[0019] Further, the monitoring unit further comprises:

[0020] A battery cluster side total voltage acquisition circuit and a load side total voltage acquisition circuit.

[0021] The battery cluster side total voltage acquisition circuit is connected between the positive electrode and the negative electrode of the battery cluster, and is configured to acquire a total voltage of the battery cluster and an insulation state between the battery cluster and the chassis ground, and transmit the acquired data as operation state data to the MCU controller.

[0022] The load side total voltage acquisition circuit is connected between the positive electrode and the negative electrode of the load, and is configured to acquire a total voltage of the load and an insulation state between the load and the chassis ground, and transmit the acquired data as operation state data to the MCU controller.

[0023] Further, the control unit comprises:

[0024] A general DO drive circuit and a general DI feedback signal circuit.

[0025] The general DO drive circuit and one end of the general DI feedback signal circuit are connected with the MCU controller, and the other ends are connected with the intelligent switch power unit.

[0026] The general DI feedback signal circuit is used for acquiring the state of the elements in the intelligent switch power unit.

[0027] The general DO drive circuit is used for controlling the elements in the intelligent switch power unit.

[0028] Further, the intelligent switch power unit comprises a current sensor, a fuse, a main circuit and a PTC pre-charging and arc-preventing branch circuit which are connected in parallel with each other, and the main circuit and the PTC pre-charging and arc-preventing branch circuit each comprise a relay.

[0029] The fuse is arranged between the positive pole of the battery cluster and the main circuit.

[0030] The current sensor is connected with the monitoring unit.

[0031] The general DO drive circuit is also used for outputting a drive signal.

[0032] The general DI feedback signal circuit is also used for receiving a feedback signal of the relay and sending the feedback signal to the MCU controller.

[0033] The MCU controller is also used for, if there is an arc, generating a control instruction through the MCU controller, transmitting the control instruction to the general DO drive circuit, and using the control instruction to close the PTC pre-charging and arc-preventing branch circuit and disconnect the main circuit and then disconnect the PTC pre-charging and arc-preventing branch circuit.

[0034] The PTC pre-charging and arc-preventing branch circuit comprises a PTC resistor.

[0035] Further, the MCU controller is also used for, if the operation state data collected by the monitoring unit is abnormal, determining the type of the abnormality, determining whether to cut off the main circuit according to the type of the abnormality, and if yes, disconnecting the main circuit through the general DO drive circuit.

[0036] Further, the current sensor is one of a shunt, a Hall sensor and a tunnel magnetic sensor.

[0037] Further, the intelligent high-voltage control switch comprises a circuit breaker, the intelligent switch power unit comprises a current sensor, a main circuit and a pre-charging branch circuit, the main circuit and the pre-charging branch circuit are connected in parallel with each other, the main circuit and the pre-charging branch circuit each comprise a relay, the pre-charging branch circuit comprises a pre-charging circuit resistor, and the circuit breaker is connected in parallel with the positive pole and the negative pole of the load.

[0038] The current sensor is connected with the monitoring unit.

[0039] The general DO drive circuit is also used for outputting a drive signal, and the drive signal is used for controlling the switching of the relays of the main circuit and the pre-charge branch and the split excitation tripping of the circuit breaker;

[0040] The general DI feedback signal circuit is also used for receiving a feedback signal of the relay and sending the feedback signal to the MCU controller.

[0041] The MCU controller is also used for generating a control instruction by the MCU controller if there is an arc, and the control instruction is transmitted to the general DO drive circuit, and the control instruction is used for controlling the circuit breaker to perform split excitation tripping.

[0042] Further, the intelligent switch controller further comprises:

[0043] The high-voltage-to-low-voltage DC / DC circuit and the LAN / CAN / 485 communication circuit;

[0044] The LAN / CAN / 485 communication circuit is used for communication between the intelligent high-voltage control switch and an external system.

[0045] The high-voltage-to-low-voltage DC / DC circuit is used for taking power from the battery cluster and supplying power to the intelligent switch controller.

[0046] Compared with the prior art, the above at least one technical scheme adopted by the embodiments of the present application can achieve at least the following beneficial effects:

[0047] The intelligent high-voltage control switch of the embodiments of the present application combines the intelligent switch controller and the intelligent switch power unit, that is, combines the control unit (the intelligent switch controller) and the power unit (the intelligent switch controller), has high integration, reduces the material cost, and improves the efficiency and reliability during the working of the device. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0049] Figure 1 is a schematic diagram of the overall structure of the intelligent high-voltage control switch of the first embodiment of the present application;

[0050] Figure 2 is a schematic diagram of the overall structure of the intelligent high-voltage control switch of the second embodiment of the present application;

[0051] Figure 3 is a schematic diagram of the overall structure of the high-voltage box of the prior art. DETAILED DESCRIPTION

[0052] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0053] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] As Figure 1 shown, the intelligent high-voltage control switch applied to the energy storage system of the first embodiment of the utility model, comprising: an intelligent switch controller and an intelligent switch power unit.

[0055] The intelligent switch power unit is connected between the load and the battery cluster of the energy storage system and is used as a switch of a high-voltage loop between the battery cluster and the load. The intelligent switch controller is connected with the intelligent switch power unit and is used for monitoring the running state of the intelligent switch power unit and controlling the intelligent switch power unit.

[0056] The intelligent switch controller comprises an MCU controller, a monitoring unit and a control unit. The monitoring unit is connected with the MCU controller and the intelligent switch power unit respectively and is used for collecting the running state data of the intelligent switch power unit and transmitting the running state data to the MCU controller. The control unit is connected with the MCU controller and the intelligent switch power unit respectively and is used for receiving the control instruction sent by the MCU controller and executing the control instruction to control the intelligent switch power unit. The intelligent switch controller is composed of a PCB (printed circuit board), an MCU chip, a communication chip and other devices from the perspective of devices.

[0057] Specifically, the monitoring unit comprises a current detection and arc detection circuit, a flame sensor circuit, a battery cluster side total voltage acquisition circuit, a load side total voltage acquisition circuit, a high-voltage to low-voltage DC / DC circuit and a LAN / CAN / 485 communication circuit.

[0058] The current detection and arc detection circuit and the flame sensor circuit are both connected to the intelligent switch power unit. The current detection and arc detection circuit can realize detection of whether there is an arc between the battery cluster and the battery cluster and between the battery cluster and the ground and transmit the detection result as the running state data to the MCU controller.

[0059] The current sensor is arranged in each battery cluster and is used for detecting the current value of the battery cluster and transmitting the detection result as the running state data to the MCU controller.

[0060] The flame sensor circuit is used for detecting whether there is an arc light caused by too close distance or weak insulation of the devices in the intelligent switch power unit or a fire caused by short circuit of the devices, and transmitting the detection result as operation state data to the MCU controller. The battery cluster side total voltage acquisition circuit is connected between the positive and negative poles of the battery cluster, and is used for acquiring the total voltage of the battery cluster and the insulation state between the battery cluster and the chassis ground, and transmitting the acquired data as operation state data to the MCU controller. The load side total voltage acquisition circuit is connected between the positive and negative poles of the load, and is used for acquiring the total voltage of the load and the insulation state between the load and the chassis ground, and transmitting the acquired data as operation state data to the MCU controller.

[0061] Specifically, the control unit includes a general DO drive circuit and a general DI feedback signal circuit.

[0062] One end of the general DO drive circuit and the general DI feedback signal circuit is connected with the MCU controller, and the other end is connected with the intelligent switch power unit. The general DI feedback signal circuit is used for acquiring the state of the elements in the intelligent switch power unit and outputting a drive signal, and controlling the switching and breaking of the relays of the main circuit and the pre-charging branch and the split excitation tripping of the circuit breaker through the drive signal.

[0063] The general DO drive circuit is used for controlling the elements in the intelligent switch power unit, receiving the feedback signal of the relays, and sending the feedback signal to the MCU controller.

[0064] The MCU controller is further used for, if there is an arc, generating a control instruction through the MCU controller, transmitting the control instruction to the general DO drive circuit, closing the PTC pre-charging and arc prevention branch through the general DO drive circuit, and opening the PTC pre-charging and arc prevention branch after opening the main circuit.

[0065] The LAN / CAN / 485 communication circuit is used for communication between the intelligent high-voltage control switch and external systems. The high-voltage to low-voltage DC / DC circuit is used for taking power from the battery cluster and supplying power to the intelligent switch controller.

[0066] The intelligent switch power unit includes a current sensor, a fuse, a main circuit and a PTC pre-charging and arc prevention branch in parallel with each other, the main circuit and the PTC pre-charging and arc prevention branch each include a relay, and the PTC pre-charging and arc prevention branch includes a PTC resistor.

[0067] The current sensor is connected with the monitoring unit. The fuse is arranged between the positive pole of the battery cluster and the main circuit. The general DO drive circuit is further used for outputting a drive signal and controlling the switching of the relays of the main circuit and the PTC pre-charging and arc prevention branch through the drive signal. The general DI feedback signal circuit is further used for receiving the feedback signal of the relays and sending the feedback signal to the MCU controller.

[0068] Specifically, the input end of the current sensor is connected to the positive pole of the battery cluster, and the output end of the current sensor is connected to the input end of the fuse, the current sensor is used for monitoring the current of the high-voltage box, and the fuse is used for cutting off the current when the high-voltage box is fused.

[0069] The main branch includes a first main branch and a second main branch, the first main branch is connected between the output end of the fuse and the positive pole of the load, and the second main branch is connected between the negative pole of the battery cluster and the negative pole of the load.

[0070] The PTC pre-charging and arc prevention branch includes a first PTC pre-charging and arc prevention branch and a second PTC pre-charging and arc prevention branch, the first PTC pre-charging and arc prevention branch is connected between the output end of the fuse and the positive pole of the load, and the second PTC pre-charging and arc prevention branch is connected between the negative pole of the battery cluster and the negative pole of the load.

[0071] Specifically, the first pre-charging resistor and the second pre-charging resistor are PTC resistors.

[0072] Specifically, the current sensor is one of a shunt, a Hall sensor and a tunnel magnetic sensor.

[0073] As shown in Figure 2 The intelligent high-voltage control switch applied to the energy storage system includes an intelligent switch controller and an intelligent switch power unit.

[0074] The intelligent high-voltage control switch includes a circuit breaker, the intelligent switch power unit includes a current sensor, a fuse, a main circuit and a pre-charging branch, the main circuit and the pre-charging branch are connected in parallel with each other, the main circuit and the pre-charging branch each include a relay, the pre-charging branch includes a pre-charging circuit resistor, and the circuit breaker is connected in parallel between the positive pole and the negative pole of the load.

[0075] Specifically, the main branch includes a first main branch and a second main branch, the first main branch is connected between the output end of the fuse and the positive electrode of the load, and the second main branch is connected between the negative electrode of the battery cluster and the negative electrode of the load.

[0076] The pre-charge resistance branch includes a first pre-charge resistance branch and a second pre-charge resistance branch, the first pre-charge resistance branch is connected between the output end of the fuse and the positive electrode of the load, and the second pre-charge resistance branch is connected between the negative electrode of the battery cluster and the negative electrode of the load.

[0077] The circuit breaker is arranged between the positive and negative ends of the load, and is used for directly disconnecting the high-voltage loop by using the circuit breaker when a system fault or a short circuit occurs, so as to prevent the system loop from being arc.

[0078] Compared with the intelligent switch power unit of the first embodiment, the intelligent switch power unit of the second embodiment further includes a circuit breaker, so the general DO drive circuit of the intelligent switch controller needs to further control the circuit breaker. Specifically, the general DO drive circuit is used for outputting a drive signal, and the drive signal is used for controlling the switching of the relays of the main loop and the pre-charge branch and the split-excitation tripping of the circuit breaker.

[0079] In addition, in addition to the same functions as the MCU controller of the first embodiment, the MCU controller is further used for generating a control instruction by the MCU controller if there is an arc, transmitting the control instruction to the general DO drive circuit, and controlling the circuit breaker to perform split-excitation tripping by the general DO drive circuit.

[0080] Specifically, the current detection and arc detection circuit can use a shunt, the flame sensor can use a photosensitive diode, the general DO drive circuit can use a platform built by a P2206HK chip and a capacitor resistor, the general DI feedback circuit can use a platform built by an LBC847BLT1G chip and a capacitor resistor, the battery-side total voltage acquisition circuit can use a platform built by an LM358DR chip, and the load-side total voltage acquisition circuit can use a platform built by an LM358DR chip.

[0081] The embodiment of the utility model has the advantages of the following:

[0082] The intelligent high-voltage control switch combines the intelligent switch controller and the intelligent switch power unit, that is, combines the control unit (the intelligent switch controller) and the power unit (the intelligent switch controller), has high integration, reduces the material cost, and improves the efficiency and reliability during device working; through long-time testing and verification of the intelligent high-voltage control switch, the intelligent high-voltage control switch can effectively reduce the failure and damage of the device in use, and improve the system stability; through cooperation of the circuit breaker (the anti-arc element) and the general DO drive circuit, the circuit breaker and the relay can be controlled to be disconnected by the intelligent switch controller to disconnect the high-voltage loop to prevent the system loop from being arc drawn when the system fails or is short-circuited; through cooperation of the PTC resistor (the anti-arc element) and the general DO drive circuit, the relay can be controlled to be disconnected by the intelligent switch controller to disconnect the high-voltage loop to prevent the system loop from being arc drawn when the system fails or is short-circuited; the intelligent high-voltage control switch can be used as a novel high-voltage box in actual use.

[0083] The above is only a specific embodiment of the utility model, and cannot limit the range of the utility model implementation, so the replacement of equivalent components or equivalent changes and modifications made in the scope of the utility model patent protection should still belong to the scope covered by the patent. In addition, the technical features in the utility model can be freely combined and used between the technical features, between the technical features and the technical solutions, and between the technical solutions.

Claims

1. A smart high-voltage control switch for use in energy storage systems, characterized in that, The application relates to an intelligent switch controller and an intelligent switch power unit. The intelligent switch power unit is connected between a load and a battery cluster of an energy storage system and serves as a switch of a high-voltage loop between the battery cluster and the load. The intelligent switch controller is connected with the intelligent switch power unit and is used for monitoring the operation state of the intelligent high-voltage control switch and controlling the intelligent switch power unit. The intelligent switch controller comprises an MCU controller, a monitoring unit and a control unit. The monitoring unit is connected with the MCU controller and the intelligent switch power unit respectively and is used for collecting operation state data of the intelligent high-voltage control switch and transmitting the operation state data to the MCU controller. The control unit is connected with the MCU controller and the intelligent switch power unit respectively and is used for receiving a control instruction sent by the MCU controller, wherein the control instruction is used for controlling the intelligent switch power unit. The monitoring unit comprises:

2. The intelligent high voltage control switch for energy storage systems of claim 1, wherein, a current detection and arc detection circuit and a flame sensor circuit, wherein the current detection and arc detection circuit and the flame sensor circuit are connected to the intelligent switch power unit. The current detection and arc detection circuit is used for detecting whether there is an arc between the battery cluster and the battery cluster and between the battery cluster and the ground and transmitting the detection result as operation state data to the MCU controller. A current sensor is arranged in each battery cluster and is used for detecting the current value of the battery cluster. The flame sensor circuit is used for detecting whether there is an arc light caused by too close distance or weak insulation of devices in the intelligent switch power unit or a fire caused by short circuit of the devices. The monitoring unit further comprises:

3. The intelligent high voltage control switch for energy storage systems of claim 2, wherein, a battery cluster side total voltage acquisition circuit and a load side total voltage acquisition circuit. The battery cluster side total voltage acquisition circuit is connected between the positive electrode and the negative electrode of the battery cluster and is used for collecting the total voltage of the battery cluster and the insulation state between the battery cluster and the chassis ground and transmitting the collected data as the operation state data to the MCU controller. The load side total voltage acquisition circuit is connected between the positive electrode and the negative electrode of the load and is used for collecting the total voltage of the load and the insulation state between the load and the chassis ground and transmitting the collected data as the operation state data to the MCU controller. The control unit comprises:

4. The intelligent high voltage control switch for energy storage systems of claim 1, wherein, a general DO drive circuit and a general DI feedback signal circuit. One end of the general DO drive circuit and the general DI feedback signal circuit is connected with the MCU controller, and the other end is connected with the intelligent switch power unit. The general DI feedback signal circuit is used for acquiring the state of elements in the intelligent switch power unit. The general DO drive circuit is used for controlling the elements in the intelligent switch power unit. The intelligent switch power unit comprises a current sensor, a fuse, a main loop and a PTC pre-charging and arc prevention branch which are connected in parallel with each other, and a relay is arranged in the main loop and the PTC pre-charging and arc prevention branch.

5. The intelligent high voltage control switch for energy storage systems of claim 4, wherein, ​ The fuse is arranged between the positive electrode of the battery cluster and the main circuit; The current sensor is connected with the monitoring unit; The universal DO drive circuit is further configured to output a drive signal, and the drive signal is used to control the switches of the relays of the main circuit and the PTC pre-charging and arc-preventing branch circuit; The universal DI feedback signal circuit is further configured to receive a feedback signal of the relays and transmit the feedback signal to the MCU controller; The MCU controller is further configured to, if there is arc drawing, generate a control instruction through the MCU controller, transmit the control instruction to the universal DO drive circuit, and the control instruction is used to close the PTC pre-charging and arc-preventing branch circuit and open the main circuit and then open the PTC pre-charging and arc-preventing branch circuit; The PTC pre-charging and arc-preventing branch circuit comprises a PTC resistor.

6. The intelligent high-voltage control switch applied to an energy storage system according to claim 5, wherein The MCU controller is further configured to, if the operation state data collected by the monitoring unit is abnormal, determine the type of the abnormality, determine whether to cut off the main circuit according to the type of the abnormality, and if yes, open the main circuit through the universal DO drive circuit.

7. The intelligent high voltage control switch for energy storage systems of claim 5, wherein, The current sensor is one of a shunt, a Hall sensor and a tunnel magnetic sensor.

8. The intelligent high voltage control switch for energy storage systems of claim 1, wherein, The intelligent high-voltage control switch comprises a circuit breaker, an intelligent switch power unit, a main circuit and a pre-charging branch circuit, the main circuit and the pre-charging branch circuit are parallel to each other, the main circuit and the pre-charging branch circuit each comprise a relay, the pre-charging branch circuit comprises a pre-charging circuit resistor, and the circuit breaker is connected in parallel between the positive electrode and the negative electrode of the load. The current sensor is connected with the monitoring unit; The universal DO drive circuit is further configured to output a drive signal, and the drive signal is used to control the switches of the relays of the main circuit and the pre-charging branch circuit and the split-excitation tripping of the circuit breaker; The universal DI feedback signal circuit is further configured to receive a feedback signal of the relays and transmit the feedback signal to the MCU controller; The MCU controller is further configured to, if there is arc drawing, generate a control instruction through the MCU controller, transmit the control instruction to the universal DO drive circuit, and the control instruction is used to control the circuit breaker to perform split-excitation tripping.

9. The intelligent high voltage control switch for energy storage systems of any of claims 1 to 8, wherein, The intelligent switch controller further comprises: a high-voltage-to-low-voltage DC / DC circuit and a LAN / CAN / 485 communication circuit; The LAN / CAN / 485 communication circuit is used for communication between the intelligent high-voltage control switch and an external system; The high-voltage-to-low-voltage DC / DC circuit is used to take power from the battery cluster and supply power to the intelligent switch controller.

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