CN117713388A - Combined energy storage system - Google Patents

Abstract

Embodiments of the present application provide a modular energy storage system, the system comprising: a first container in which a battery unit is mounted; a second container connected to the first container, the second container being equipped with a PCS unit for converting a current type; the third container is connected with the second container, and is provided with a transformer in a built-in manner, and the transformer is used for boosting or reducing the current; and the fourth container is connected with the third container, a high-voltage cabinet is assembled in the fourth container, and the high-voltage cabinet is used for being connected with an external power grid so as to realize the charging or discharging of the energy storage system. The technical scheme that the embodiment of this application provided can promote energy storage system's installation flexibility and transportation convenience.

Description

Combined energy storage system

Technical Field

The application relates to the technical field of energy storage, in particular to a combined energy storage system.

Background

At present, an energy storage power station or a place where an energy storage system is installed is generally arranged by adopting an energy storage container, the size of the energy storage container is generally 40 feet or 45 feet, and the energy storage container mainly has the following two defects, in the first aspect, the energy storage container needs to adopt large-scale equipment during transportation and hoisting, and the cost is high; in the second aspect, when the installation is carried out on site, the requirement on the flatness of the installation site is higher; therefore, the existing energy storage system has the defects that the installation is affected by the field, the transportation is inconvenient and the like.

Disclosure of Invention

The embodiment of the application provides a combined energy storage system, and the installation flexibility and the transportation convenience of the energy storage system can be improved based on the technical scheme provided by the application.

Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the practice of the application.

There is provided in accordance with an embodiment of the present application a modular energy storage system, the energy storage system comprising: a first container in which a battery unit is mounted; a second container connected to the first container, the second container being equipped with a PCS unit for converting a current type; the third container is connected with the second container, and is provided with a transformer in a built-in manner, and the transformer is used for boosting or reducing the current; and the fourth container is connected with the third container, a high-voltage cabinet is assembled in the fourth container, and the high-voltage cabinet is used for being connected with an external power grid so as to realize the charging or discharging of the energy storage system.

In some embodiments of the present application, based on the foregoing solution, the PCS unit includes a bus bar and a PCS control cabinet; the converging cabinet is connected with the first container and used for converging current; the PCS control cabinet is connected with the confluence cabinet and used for converting current types.

In some embodiments of the present application, based on the foregoing solution, an EMS system control cabinet is further configured in the second container, for managing the energy storage system; and a low-voltage control cabinet is also arranged in the fourth container and is respectively connected with the high-voltage cabinet and the transformer and used for managing the high-voltage cabinet and the transformer.

In some embodiments of the present application, based on the foregoing, the energy storage system further includes: a first spare container for replacing the failed first container; a second spare container for replacing the failed second container; a third spare container for replacing the failed third container; and the fourth standby container is used for replacing the fourth container with the fault.

In some embodiments of the present application, based on the foregoing, the size of any one of the first container, the second container, the third container, and the fourth container is 10 feet or 20 feet.

In some embodiments of the present application, based on the foregoing solution, the first container is a fire-resistant insulation structure.

In some embodiments of the present application, based on the foregoing, the first container is further equipped with:

the access control device is used for remotely monitoring the state of the first container door; the ventilation device is used for ventilating when the battery cells generate combustible gas in a battery thermal runaway way so as to be beneficial to discharging the combustible gas; and the pressure release device is used for releasing the combustible gas so as to balance the pressure in the first container.

In some embodiments of the present application, based on the foregoing, the first container, the second container, the third container, and the fourth container are each configured with a fire-fighting device therein.

In some embodiments of the present application, based on the foregoing solution, a manhole cover is disposed below the high-voltage cabinet, and the manhole cover is connected to the high-voltage cabinet, so as to connect the high-voltage cabinet to an external power grid.

In some embodiments of the present application, based on the foregoing solution, the energy storage system further includes at least one fifth container, the fifth container is equipped with a battery unit, and the fifth container is used in series or parallel with the first container to implement expansion of the energy storage system.

According to the technical scheme, the combined energy storage system is designed, and the energy storage system comprises: a first container in which a battery unit is mounted; a second container connected to the first container, the second container being equipped with a PCS unit for converting a current type; the third container is connected with the second container, and is provided with a transformer in a built-in manner, and the transformer is used for boosting or reducing the current; and the fourth container is connected with the third container, a high-voltage cabinet is assembled in the fourth container, and the high-voltage cabinet is used for being connected with an external power grid so as to realize the charging or discharging of the energy storage system. Therefore, compared with the prior art, the technical scheme of the application has the advantages that each functional module of the energy storage system is not integrated in one container, but is modularized, each functional module is respectively arranged in one independent container, so that each container comprising the energy storage system can be independently transported in the transportation process, and can be transported in a combined way, the convenience of transporting the energy storage system can be improved, in addition, because each container comprising the energy storage system is not fixedly connected, the combination form of each container can be adjusted according to the actual condition of the field installation field, and the energy storage system is matched with the installation field, so that the flexibility of installing the energy storage system is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 illustrates a schematic architecture of a modular energy storage system according to one embodiment of the present application;

fig. 2 shows a schematic layout of a combined energy storage system according to an embodiment of the present application.

The reference numerals are explained as follows:

100-first container, 110-battery unit,

200-second container, 210-PCS unit,

211-a confluence cabinet, 212-a PCS control cabinet,

213-an EMS system control cabinet,

300-third container, 310-transformer,

400-fourth container, 410-high voltage cabinet,

420-a low-voltage control cabinet,

500-a fifth container, which is a container,

600-a first spare container is to be stored,

700-a second spare container is to be stored,

800-a third spare container for use in a container,

900-fourth spare container.

Detailed Description

Exemplary embodiments that embody features and advantages of the present application are described in detail in the following description. It will be understood that the present application is capable of various modifications in various embodiments, all without departing from the scope of the present application, and that the description and illustrations herein are intended to be by way of illustration only and not to be limiting.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and do not indicate or imply that the system or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, a schematic architecture diagram of a combined energy storage system according to one embodiment of the present application is shown.

In some embodiments, the energy storage system includes a first container 100, a second container 200, a third container 300, and a fourth container 400,

wherein, the first container 100 is equipped with a battery unit 110; the second container 200 is connected to the first container 100, and a PCS unit 210 is mounted in the second container 200, and the PCS unit 210 is used for converting the current type; the third container 300 is connected to the second container 200, and a transformer 310 is assembled in the third container 300, and the transformer 310 is used for boosting or reducing the current; the fourth container 400 is connected to the third container 300, and a high-voltage cabinet 410 is assembled in the fourth container 400, and the high-voltage cabinet 410 is used for connecting to an external power grid to realize charging or discharging of the energy storage system.

It will be appreciated that the various functional modules of the modular energy storage system are not integrated within the same container, but are dispersed within different containers. The individual containers can be distributed during production and assembly. Meanwhile, when the energy storage system is installed, the installation position of each container can be adjusted according to the on-site installation condition so as to adapt to the installation condition. By way of example, referring to fig. 2, two possible installation combinations are shown, and a skilled person may make a specific combination design according to the actual conditions of the field installation.

It should be noted that the connection between the containers in the energy storage system may be through a cable connection.

In some embodiments, the size of any one of the first container 100, the second container 200, the third container 300, and the fourth container 400 is 10 feet or 20 feet. In particular, other dimensions may be provided. It should be noted that the dimensions of the containers in the energy storage system of the present application may be the same or different.

In some embodiments, the PCS unit 210 includes a bus bar 211 and a PCS control bar 212; the junction box 211 is connected with the first container 100 and is used for collecting current; the PCS control cabinet 212 is connected to the bus bar 211 for converting the current type.

In some embodiments, an EMS system control cabinet 213 is also installed in the second container 200, for managing the energy storage system.

In the present embodiment, because three electrical devices of the PCS control cabinet 212, the EMS system control cabinet 213 and the bus cabinet 211 generate less heat during operation, all of the three are installed in the second container 200, and during discharging, the wire harness integrated by the battery unit 110 is connected to the bus cabinet 211 for bus, and then connected to the PCS control cabinet 212 to convert direct current into alternating current, and then the converted alternating current is transmitted to the transformer 310; the current flow direction of the charging process is opposite to that of the discharging process, the charging process is that the transformer 310 transmits the current after the voltage reduction to the PCS control cabinet 212, the PCS control cabinet 212 converts the input current from alternating current to direct current, and then transmits the direct current to the bus cabinet 211 for bus, and finally, the direct current is transmitted to the battery unit 110 for electric energy storage.

In this embodiment, the EMS system control cabinet 213 is configured to manage the energy storage system. The EMS system control cabinet 213 is connected with each container, and can manage each electrical device in each container, and simultaneously can also be connected with an external control platform, so that the external control platform can remotely control the whole energy storage system. Specifically, the EMS system control cabinet 213 manages the content of the whole energy storage system, including but not limited to the number of times of charging, the number of times of discharging, the duration of charging, the duration of discharging, the first set value or the second set value of the transformer 310, the maintenance schedule of each electrical device in the energy storage system, and so on.

In some embodiments, a manhole cover is disposed below the high-voltage cabinet 410, and the manhole cover is connected to the high-voltage cabinet 410, so as to connect the high-voltage cabinet 410 to an external power grid. It should be noted that, be provided with the trench below the manhole cover, the cable of whole combination formula energy storage system passes through the trench below the manhole cover and is connected to the external power supply network for the energy storage system of this application can realize charging/discharging function.

The following describes overall the process of charging the energy storage system designed in the present application:

the external power grid is connected, the current of the external power grid is input to the transformer 310 through the high-voltage cabinet 410, the transformer 310 steps down the voltage of the external input high-voltage power to a first set value, and then the voltage is transmitted to the PCS control cabinet 212 to convert the current from alternating current to direct current, and finally the direct current is transmitted to the bus cabinet 211 and then to the battery unit 110 for storing the electric energy.

The following describes the overall process of discharging the energy storage system designed in the present application:

after the battery unit 110 transmits the direct current to the bus bar 211, the bus bar 211 then collects the direct current and transmits the direct current to the PCS control cabinet 212, the psc control cabinet converts the input direct current into alternating current and then transmits the alternating current to the transformer 310, and the transformer 310 boosts the input alternating current to the second set value and then transmits the current to the high-voltage cabinet 410, so that the input alternating current can be transmitted to an external power grid to realize the charging function.

In some embodiments, a low-voltage control cabinet 420 is further installed in the fourth container 400, and the low-voltage control cabinet 420 is connected to the high-voltage cabinet 410 and the transformer 310, respectively, for managing the high-voltage cabinet 410 and the transformer 310.

In this embodiment, by arranging the low-voltage control cabinet 420 in the fourth container 400, the transformer 310 and the high-voltage cabinet 410 can be managed and controlled more reasonably, which is beneficial for maintenance personnel to overhaul the transformer 310 or the high-voltage cabinet 410, and further improves safety.

In some embodiments, the first container 100 is a fire-resistant insulation structure. It can be appreciated that, since the battery unit 110 is assembled in the first container 100, heat generated during operation is more, and fire is easy to occur, the first container 100 adopts the fireproof heat-preserving structure, which is beneficial to improving the safety of the energy storage system.

It should be noted that, in addition to the first container 100, the energy storage system in the present application generates less heat due to the electrical devices disposed in other containers, so that the corresponding container may be a common container without setting a fireproof insulation structure.

In some embodiments, a heat dissipating device may be disposed in the PCS control cabinet 212 configured in the second container 200, thereby improving the security of the second container 200.

In some embodiments, an access device, a ventilation device, and a pressure relief device are also installed in the first container 100.

The door control device is used for remotely monitoring the state of the door of the first container 100; the ventilation means is for ventilating when the battery thermal runaway of the battery cell 110 occurs to generate a combustible gas, so as to facilitate the discharge of the combustible gas; the pressure relief device is used to release the combustible gas to equalize the pressure within the first container 100.

It should be noted that, the pressure relief device and the ventilation device do not work when the battery unit 110 works normally, when the battery in the battery unit 110 is out of control (i.e. when abnormal working occurs), flammable gas such as hydrogen and carbon monoxide can be generated, and when the capacity of the flammable gas reaches a certain proportion, explosion can occur, at this time, the ventilation device and the pressure relief device are opened to work, and the flammable gas can be discharged to the outside of the first container 100, so as to prevent the flammable gas from reaching the explosion limit and causing a safety accident.

In this embodiment, by providing the access control device in the first container 100, real-time monitoring of the state of the battery unit 110 can be achieved, and the safety of the first container 100 is ensured. By providing ventilation means and pressure relief means in the battery unit 110, safety accidents due to thermal runaway of the battery in the first container 100 can be avoided.

In some embodiments, a cooling system may be further disposed in the first container 100 to cool the battery unit 110, so as to prevent a safety accident. The cooling system can be in the forms of an air conditioning system, a water cooling unit and the like, and can be a unit with low power.

In some embodiments, fire-fighting equipment is disposed in each of the first container 100, the second container 200, the third container 300, and the fourth container 400.

The fire-fighting equipment includes, but is not limited to, an automatic induction smoke exhaust device, a smoke detector, a temperature detector, a storage tank with fire-extinguishing function (such as heptafluoropropane fire-extinguishing equipment), and the like. In some embodiments, the safety of the energy storage system may be ensured by connecting various detectors (such as smoke detectors) to the EMS system control cabinet 213 to enable real-time monitoring of the pyrotechnic status of the individual containers, or the auto-induction smoke evacuation device may automatically evacuate smoke when smoke is detected.

In the embodiment, the fire-fighting equipment is arranged in each container of the energy storage system, so that the occurrence of safety accidents can be effectively reduced.

In some embodiments, the energy storage system of the present application further comprises a first spare container 600, a second spare container 700, a third spare container 800, and a fourth spare container 900.

The first spare container 600 is used for replacing the first container 100 with the fault; the second spare container 700 is used for replacing the second container 200 with the fault; the third spare container 800 is used for replacing the third container 300 with the fault; the fourth spare container 900 is used for replacing the fourth container 400 that has failed.

In this embodiment, the configuration within the first spare container 600 is the same as the configuration within the first container 100; the arrangement in the second spare container 700 is the same as the arrangement in the second container 200, the arrangement in the third spare container 800 is the same as the arrangement in the third container 300, and the arrangement in the fourth spare container 900 is the same as the arrangement in the fourth container 400.

Because in the prior art, each functional module in the energy storage system is integrated in the same large-size container, if part of functional modules in the existing energy storage system fail, the failed components need to be removed on site, or the whole energy storage system is hoisted and transported to a maintenance place for maintenance, so that the operation and maintenance mode for the failed energy storage system in the prior art is inconvenient and high in cost.

In this application, if any part in the energy storage system breaks down, need not to maintain in the open air on the scene, can transfer the container of installation trouble part to indoor maintenance, install the replacement with the reserve container that corresponds simultaneously to promote energy storage system's maintenance efficiency, make whole energy storage system can be faster resume normal operating condition.

In some embodiments of the present application, the energy storage system further comprises at least one fifth container 500, the fifth container 500 is equipped with a battery unit 110, and the fifth container 500 is used in series or parallel with the first container 100 to realize expansion of the energy storage system.

In this embodiment, the configuration in each fifth container 500 is the same as the configuration in the first container 100, so that when there is a capacity expansion requirement, the fifth container 500 can be conveniently connected in series or in parallel with the first container 100, and the battery capacity of the energy storage system can be increased flexibly.

In some embodiments of the present application, a combined energy storage system is designed, where the energy storage system includes: a first container 100, the first container 100 being equipped with a battery unit 110; a second container 200 connected to the first container 100, the second container 200 being equipped with a PCS unit 210, the PCS unit 210 being used for converting a current type; a third container 300 connected to the second container 200, wherein a transformer 310 is assembled in the third container 300, and the transformer 310 is used for boosting or reducing current; and a fourth container 400 connected with the third container 300, wherein a high-voltage cabinet 410 is assembled in the fourth container 400, and the high-voltage cabinet 410 is used for connecting an external power grid to realize the charging or discharging of the energy storage system. Based on the combined energy storage system, at least the following six technical effects can be achieved:

first aspect: because each functional module of the energy storage system is not integrated in one container, but is modularized, each functional module is respectively arranged in one independent container, so that each container included in the energy storage system can be independently transported or combined transported in the transportation process, and the convenience of transporting the energy storage system can be improved;

in the second aspect, since the battery unit 110 in the energy storage system is separately configured in the first container 100, if a thermal runaway safety accident occurs in the battery unit 110, the battery unit 110 will not affect other containers in the energy storage system, so as to further improve the safety of the energy storage system;

in the third aspect, because each container included in the energy storage system is not fixedly connected, the combination form of each container can be adjusted according to the actual condition of the field installation site, so that the energy storage system is matched with the installation site, and the flexibility of installing the energy storage system is improved;

according to the energy storage system designed based on the method, the fault components in the energy storage system can be quickly maintained or replaced, so that the maintenance efficiency of the energy storage system is improved, and the energy storage system can be restored to a normal state in a short time after the fault occurs;

in the fifth aspect, at least one fifth container 500 is provided in the present application, so that when there is a capacity expansion requirement, the battery power of the energy storage system can be rapidly increased flexibly, and the capacity expansion of the energy storage system can be efficiently completed.

In the sixth aspect, because each functional module in the energy storage system is not integrated in the same container, when an upgrade requirement exists for a certain functional module, the functional module can be quickly replaced and upgraded.

The foregoing is merely exemplary of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A modular energy storage system, the energy storage system comprising:

a first container in which a battery unit is mounted;

a second container connected to the first container, the second container being equipped with a PCS unit for converting a current type;

the third container is connected with the second container, and is provided with a transformer in a built-in manner, and the transformer is used for boosting or reducing the current;

and the fourth container is connected with the third container, a high-voltage cabinet is assembled in the fourth container, and the high-voltage cabinet is used for being connected with an external power grid so as to realize the charging or discharging of the energy storage system.

2. The energy storage system of claim 1, wherein the PCS unit comprises a bustle and a PCS control cabinet;

the converging cabinet is connected with the first container and used for converging current;

the PCS control cabinet is connected with the confluence cabinet and used for converting current types.

3. The energy storage system of claim 1, wherein an EMS system control cabinet is also mounted within the second container for managing the energy storage system; and a low-voltage control cabinet is also arranged in the fourth container and is respectively connected with the high-voltage cabinet and the transformer and used for managing the high-voltage cabinet and the transformer.

4. The energy storage system of claim 1, further comprising:

a first spare container for replacing the failed first container;

a second spare container for replacing the failed second container;

a third spare container for replacing the failed third container;

and the fourth standby container is used for replacing the fourth container with the fault.

5. The energy storage system of claim 1, wherein the size of any of the first container, the second container, the third container, and the fourth container is 10 feet or 20 feet.

6. The energy storage system of claim 1, wherein the first container is a fire resistant insulation structure.

7. The energy storage system of claim 1, wherein the first container is further configured with:

the access control device is used for remotely monitoring the state of the first container door;

the ventilation device is used for ventilating when the battery cells generate combustible gas in a battery thermal runaway way so as to be beneficial to discharging the combustible gas;

and the pressure release device is used for releasing the combustible gas so as to balance the pressure in the first container.

8. The energy storage system of claim 1, wherein each of the first container, the second container, the third container, and the fourth container is configured with a fire protection device.

9. The energy storage system of claim 1, wherein a manhole is arranged below the high-voltage cabinet, and the manhole is connected with the high-voltage cabinet for realizing connection of the high-voltage cabinet with an external power grid.

10. The energy storage system of claim 1, further comprising at least one fifth container, the fifth container being equipped with a battery unit, the fifth container being configured to be connected in series or in parallel with the first container to enable expansion of the energy storage system.