CN218770742U - High-pressure tank of energy storage system - Google Patents

Abstract

The embodiment of the utility model discloses a high-voltage box for an energy storage system, which includes a box body, and a DC circuit breaker, a DC current sensor, a contactor, and a battery management unit are arranged in the box body; correspondingly, the box body The panel is equipped with wiring terminals, circuit breaker opening and closing handles, and the communication interface of the battery management unit; the DC circuit breaker is connected to the wiring terminals, and an external battery pack is connected through the wiring terminals, and the connection or disconnection status of the circuit breaker is uploaded to the The battery management unit; the DC current sensor uploads the current signal to the battery management unit; the contactor is connected to the terminal, and an external battery pack is connected through the terminal, and the connection of the contactor Or the disconnected state is uploaded to the battery management unit. It can further improve the reliability of the electrical main circuit of the local battery pack and the performance of the battery management unit, providing guarantee for the reliable operation of the battery system.

Description

An energy storage system high pressure box

technical field

The utility model relates to the technical field of battery energy storage systems, in particular to a high-voltage box of the energy storage system.

Background technique

At present, the battery energy storage system plays an irreplaceable role on the power generation side, power transmission and distribution side, and user side. It has a wide range of application scenarios and is one of the important means to solve the grid-connected consumption of renewable energy. The main function of the high-voltage box of the energy storage system is to control the connection or disconnection of the electrical main circuit of the system. The battery management unit (BMS) installed inside it can simultaneously monitor the battery voltage, current, temperature and the status of switches, contactors, fans, etc. in real time. , perform state discrimination, thermal management control, balance control and other operations on the local battery pack, and at the same time send local battery information and respond to remote control.

Due to the large number of batteries managed by the large-scale energy storage system and the large number of connection nodes, the safety and reliability of the electrical circuit is very important. The existing high-voltage boxes of the energy storage system mostly adopt technical solutions in the field of electric vehicles, and the electrical main circuit is connected by a DC contactor. Or off, the DC contactor in the field of electric vehicles adopts a closed arc extinguishing chamber structure. This type of contactor has poor arc extinguishing ability and is not suitable for energy storage systems with high power and relatively high rated voltage. The battery management unit only has the function of collecting local battery pack information, and does not have the function of self-checking the electrical connection of the main circuit of the large-scale energy storage system. The safety and reliability of the energy storage system cannot be guaranteed.

In the related technology, there are many technical solutions and structural forms of the high voltage box. How to optimize the reliability of the electrical main circuit, the reduction of the total cost of materials, and the performance of the battery management unit has become a problem to be solved by those skilled in the art.

In the existing energy storage system, the DC contactor in the automotive field is used to connect or disconnect the electrical main circuit. This type of contactor adopts a closed arc extinguishing chamber structure, which has poor arc extinguishing ability and is not suitable for storage with high power and relatively high rated voltage. The energy system; the battery management unit does not have the self-check function of the electrical connection of the main circuit of the large-scale energy storage system, and the safety and reliability of the energy storage system cannot be guaranteed.

Utility model content

The purpose of this utility model is to provide a high-voltage box for an energy storage system, which is used to solve at least one of the above-mentioned technical problems. At the same time, high-precision DC current sensors and fuses are installed in the main electrical circuit to improve the reliability of the electrical main circuit; the battery management unit processes the current signals collected by the high-precision DC current sensor, and has the self-test function of the electrical main circuit, which can be used in energy storage. Real-time screening of current spikes and arcing signals caused by unreliable connection nodes before and during system operation can further improve the reliability of the electrical main circuit of the local battery pack and the performance of the battery management unit, providing a guarantee for the reliable operation of the battery system .

Embodiments of the utility model are achieved in that:

A high-voltage box for an energy storage system, which includes a box body 10, and the box body 10 is provided with a DC circuit breaker 20, a DC current sensor 70, a contactor, and a battery management unit 130;

Correspondingly, the panel of the box body 10 is equipped with terminal blocks, breaker opening and closing handles and battery management unit communication interface;

The DC circuit breaker 20 is connected to the connecting terminal, and an external battery pack is connected through the connecting terminal, and the connected or disconnected state of the circuit breaker is uploaded to the battery management unit 130;

The DC current sensor 70 uploads the current signal to the battery management unit 130;

The contactor is connected to the terminal, and an external battery pack is connected through the terminal, and the on or off state of the contactor is uploaded to the battery management unit 130;

The battery management unit 130 is used to collect local battery information, perform state discrimination, thermal management control, and balance control on the local battery pack, send local battery information and respond to remote control, and collect current signals from the DC circuit breaker 20 to process.

In a preferred embodiment of the present invention, the terminals of the high voltage box of the energy storage system include a battery pack general positive terminal, a battery pack general negative terminal, an external general positive terminal, and an external general negative terminal;

The external general positive terminal and the battery pack general positive terminal form a positive electrical circuit;

The external general negative terminal and the battery pack general negative terminal form a negative electrical circuit;

The DC circuit breaker 20 is connected to the electrical circuit.

In a preferred embodiment of the present utility model, a fuse 80 is also provided in the box body 10 of the high-voltage box of the energy storage system;

The fuse 80 is connected to the positive electric circuit, and is used for short-circuiting and overcurrent of the energy storage system and as backup protection.

In a preferred embodiment of the present utility model, the contactors of the high-voltage box of the energy storage system include a main positive contactor 30 and a main negative contactor 40;

The main positive contactor 30 is connected to the positive electrical circuit, and the on or off state of the main positive contactor 30 is uploaded to the battery management unit 130;

The main negative contactor 40 is connected to the negative electrical circuit, and the on or off state of the main negative contactor 40 is uploaded to the battery management unit 130 .

In a preferred embodiment of the present utility model, the DC current sensor 70 of the high voltage box of the energy storage system is connected to the negative electrical circuit.

In a preferred embodiment of the present utility model, the main positive contactor 30 of the high voltage box of the energy storage system is connected in parallel with a protection circuit;

The protection circuit includes a pre-charging resistor 60 and a pre-charging contactor 50 .

In a preferred embodiment of the present utility model, a main positive busbar assembly 90 and a main negative busbar assembly 100 are also provided in the box body 10 of the high voltage box of the energy storage system;

The main positive busbar assembly 90 is connected to the positive electrical circuit;

The main and negative busbar assembly 100 is connected to the negative electrical circuit.

In a preferred embodiment of the present utility model, a power module is also provided in the box body 10 of the high-voltage box of the energy storage system to provide independent power supply for the cooling fan of the local battery pack and the battery management unit 130;

The power module includes a first power module 110 and a second power module 120 .

In a preferred embodiment of the present utility model, the box body 10 of the high-pressure box of the energy storage system further includes a bottom plate, a side plate, a cover plate and a rear panel;

The side plate is provided with cooling holes.

In a preferred embodiment of the present invention, the panel of the box body 10 of the high voltage box of the energy storage system is further provided with a signal interface, an indicator light, an insulation detection interface and a battery management unit communication interface.

The beneficial effects of the utility model embodiment are:

The utility model adopts a circuit breaker, a contactor, a DC current sensor, a fuse, and a copper bar assembly suitable for a high-power, rated voltage 1500VDC energy storage system to form an electrical main circuit. The DC current sensor has a high-precision current sampling and Uploaded to the battery management unit, the battery management unit processes the current signal collected by the high-precision DC current sensor, and has the self-inspection function of the electrical main circuit. The above-mentioned measures can further improve the reliability of the electrical main circuit of the local battery pack and the performance of the battery management unit, and provide guarantee for the reliable operation of the battery system.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a schematic structural diagram of the high-voltage box of the energy storage system of the present invention;

Fig. 2 is a schematic structural diagram of the electrical main circuit of the high voltage box of the energy storage system of the present invention;

Fig. 3 is a functional schematic diagram of the battery management unit of the high voltage box of the energy storage system of the present invention.

In the figure: 10-box; 20-DC circuit breaker; 30-main positive contactor; 40-main negative contactor; 50-precharge contactor; 60-precharge resistance; 70-DC current sensor; 80-fuse 90-main positive busbar assembly; 100-main negative busbar assembly; 1 module of 110-24V power supply; 2 modules of 120-24V power supply; 130-battery management unit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein can be arranged and designed in a variety of different configurations.

Please refer to Fig. 1 to Fig. 3, the embodiment of the utility model provides a high-voltage box of an energy storage system, which includes a box body 10, and the box body 10 is provided with a DC circuit breaker 20, a DC current sensor 70, a contactor and battery management unit 130;

Correspondingly, the panel of the box body 10 is equipped with terminal blocks, breaker opening and closing handles and battery management unit communication interface;

The DC circuit breaker 20 is connected to the connecting terminal, and an external battery pack is connected through the connecting terminal, and the connected or disconnected state of the circuit breaker is uploaded to the battery management unit 130;

The DC circuit breaker 20 has a rated operating voltage of 1500VDC and a rated current of not less than 250A.

The DC current sensor 70 uploads the current signal to the battery management unit 130;

The rated operating voltage of the DC current sensor 70 is 1500VDC, which meets the requirements of 250A/75mV and is better than 0.5 level.

The contactor is connected to the terminal, and an external battery pack is connected through the terminal, and the on or off state of the contactor is uploaded to the battery management unit 130;

The battery management unit 130 is used to collect local battery information, perform state discrimination, thermal management control, and balance control on the local battery pack, send local battery information and respond to remote control, and collect current signals from the DC circuit breaker 20 to process.

The battery management unit 130 collects local battery information and performs operations such as state discrimination, thermal management control, and equalization control on the local battery pack, and at the same time sends local battery information and responds to remote control functions. The current collected by the DC current sensor The signal is processed, and it has the self-inspection function of the electrical main circuit. It can screen the current spikes and arcing signals caused by unreliable connection nodes before and during the operation of the energy storage system, and further improve the electrical main circuit of the local battery pack. reliability and battery management unit performance.

In a preferred embodiment of the present invention, the terminals of the high voltage box of the energy storage system include a battery pack general positive terminal, a battery pack general negative terminal, an external general positive terminal, and an external general negative terminal;

The external general positive terminal and the battery pack general positive terminal form a positive electrical circuit;

The external general negative terminal and the battery pack general negative terminal form a negative electrical circuit;

The DC circuit breaker 20 is connected to the electrical circuit.

In a preferred embodiment of the present utility model, a fuse 80 is also provided in the box body 10 of the high-voltage box of the energy storage system;

The fuse 80 is connected to the positive electric circuit, and is used for short-circuiting and overcurrent of the energy storage system and as backup protection.

The fuse 80 has a rated operating voltage of 1500VDC, a rated current of 200A-400A, and has strong current limiting and high breaking capacity.

In a preferred embodiment of the present utility model, the contactors of the high-voltage box of the energy storage system include a main positive contactor 30 and a main negative contactor 40;

The main positive contactor 30 is connected to the positive electrical circuit, and the on or off state of the main positive contactor 30 is uploaded to the battery management unit 130;

The main negative contactor 40 is connected to the negative electrical circuit, and the on or off state of the main negative contactor 40 is uploaded to the battery management unit 130 .

In a preferred embodiment of the present utility model, the DC current sensor 70 of the high voltage box of the energy storage system is connected to the negative electrical circuit.

In a preferred embodiment of the present utility model, the main positive contactor 30 of the high voltage box of the energy storage system is connected in parallel with a protection circuit;

The protection circuit includes a pre-charging resistor 60 and a pre-charging contactor 50 .

The pre-charging resistor 60 is an ohm-level resistor with a rated working voltage of 1500VDC.

In a preferred embodiment of the present utility model, a main positive busbar assembly 90 and a main negative busbar assembly 100 are also provided in the box body 10 of the high voltage box of the energy storage system;

The main positive busbar assembly 90 is connected to the positive electrical circuit;

The main and negative busbar assembly 100 is connected to the negative electrical circuit.

The main positive busbar assembly 90 and the main negative busbar assembly 100 are made of copper, covered with an insulating layer, and have a working voltage of 1500VDC.

In a preferred embodiment of the present utility model, a power module is also provided in the box body 10 of the high-voltage box of the energy storage system to provide independent power supply for the cooling fan of the local battery pack and the battery management unit 130;

The power module includes a first power module 110 and a second power module 120 .

Both the first power supply module 110 and the second power supply module 120 are 24V.

In a preferred embodiment of the present utility model, the box body 10 of the high-pressure box of the energy storage system further includes a bottom plate, a side plate, a cover plate and a rear panel;

The side plate is provided with cooling holes.

The box body 10 is a sheet metal part.

In a preferred embodiment of the present invention, the panel of the box body 10 of the high voltage box of the energy storage system is further provided with a signal interface, an indicator light, an insulation detection interface and a battery management unit communication interface.

The embodiment of the utility model aims to protect a high-voltage box of an energy storage system, and has the following effects:

1. The utility model adopts a DC circuit breaker, a main positive contactor, a main negative contactor, a pre-charging contactor, a pre-charging resistance, a DC current sensor, a fuse, a main positive The electrical main circuit composed of busbar components, main and negative busbar components can meet the reliability requirements of large-scale energy storage systems.

2. The DC current sensor of the utility model meets the requirements of better than 0.5 level high-precision current sampling and uploads to the battery management unit. The battery management unit processes the current signal collected by the high-precision DC current sensor and has the self-test function of the electrical main circuit. Real-time screening of current spikes and arcing signals caused by unreliable connection nodes can be carried out before and during the operation of the energy storage system. The above measures can further improve the reliability of the electrical main circuit of the local battery pack and the performance of the battery management unit. The reliable operation of the battery system provides guarantee.

3. The pre-charging circuit composed of the pre-charging contactor and the pre-charging resistor of the utility model pre-charges the bus capacitance, which can ensure the normal operation of the electrical main circuit to a limited extent.

4. The battery management unit of the utility model receives the disconnection signal of the upper-level battery system PCS confluence cabinet, and the electrical main circuit of the local battery system has no current, which can cut off the electrical main circuit without load and effectively protect the components in the box.

It should be understood that the above specific embodiments of the present utility model are only used to illustrate or explain the principle of the present utility model, but not to limit the present utility model. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model shall be included in the protection scope of the present utility model. Furthermore, the appended claims are intended to cover all changes and modifications that come within the scope and boundaries of the appended claims, or equivalents of such scope and boundaries.

Claims (10)

1. The high-voltage box of the energy storage system is characterized by comprising a box body (10), wherein a direct current breaker (20), a direct current sensor (70), a contactor and a battery management unit (130) are arranged in the box body (10);

correspondingly, a wiring terminal, a breaker opening and closing handle and a battery management unit communication interface are arranged on a panel of the box body (10);

the direct current circuit breaker (20) is connected with the wiring terminal, is connected with an external battery pack through the wiring terminal, and uploads the connection or disconnection state of the circuit breaker to the battery management unit (130);

the DC current sensor (70) uploading a current signal to the battery management unit (130);

the contactor is connected with the wiring terminal, an external battery pack is connected through the wiring terminal, and the on-off state of the contactor is uploaded to the battery management unit (130);

the battery management unit (130) is used for collecting local battery information, performing state discrimination, thermal management control and balance control on a local battery pack, uploading the local battery information and responding to remote control, and processing a current signal acquired by the direct current circuit breaker (20).

2. The energy storage system high-voltage box according to claim 1, wherein the terminals comprise a battery pack general positive terminal, a battery pack general negative terminal, an external general positive terminal and an external general negative terminal;

the external main positive terminal and the battery pack main positive terminal form a positive electrode electric loop;

the external total negative connecting terminal and the battery pack total negative connecting terminal form a negative electric loop;

the direct current breaker (20) is connected into an electric loop.

3. The energy storage system high pressure tank of claim 2, characterized in that a fuse (80) is further provided in the tank (10);

and the fuse (80) is connected into the positive electrode electric loop and is used for short-circuit and over-current of the energy storage system and backup protection.

4. The energy storage system high pressure tank of claim 2, wherein the contactor comprises a main positive contactor (30) and a main negative contactor (40);

the main positive contactor (30) is connected into the positive electrical circuit, and the on or off state of the main positive contactor (30) is uploaded to the battery management unit (130);

the main negative contactor (40) is connected into the negative electrical circuit, and the connection or disconnection state of the main negative contactor (40) is uploaded to the battery management unit (130).

5. The energy storage system high pressure tank of claim 2, wherein the dc current sensor (70) is connected into the negative electrical circuit.

6. The energy storage system high pressure tank of claim 4,

the main positive contactor (30) is connected with a protection loop in parallel;

the protection circuit comprises a pre-charging resistor (60) and a pre-charging contactor (50).

7. The energy storage system high-pressure tank as claimed in claim 2, characterized in that a main positive busbar assembly (90) and a main negative busbar assembly (100) are further arranged in the tank body (10);

the main positive busbar component (90) is connected with the positive electrode electric circuit;

the main negative busbar assembly (100) is connected with the negative electrode electric loop.

8. The energy storage system high-pressure tank as claimed in claim 1, characterized in that a power module is further arranged in the tank body (10) to independently supply power to the local battery pack cooling fan and the battery management unit (130);

the power supply module includes a first power supply module (110) and a second power supply module (120).

9. The energy storage system high pressure tank of claim 1,

the box body (10) also comprises a bottom plate, side plates, a cover plate and a rear panel;

the side plate is provided with heat dissipation holes.

10. The energy storage system high pressure tank of claim 1,

and a panel of the box body (10) is also provided with a signal interface, an indicator light, an insulation detection interface and a battery management unit communication interface.

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