TWM640962U - E-s type integrated multifunctional energy storage cabinet - Google Patents

Abstract

A multi-functional integrated E-S type grid-connected system energy storage cabinet, which includes: a cabinet body, the cabinet body The part includes a solar converter, a control panel, a power storage module, a plurality of backup power sockets and a mains grid-connected socket; wherein, the solar converter communicates with a solar photovoltaic panel outside the cabinet through the control panel Electrically connected, the solar photovoltaic panel transmits an electric energy to the solar inverter, and then transmits it to the power storage module for storage or transmits it to the backup power sockets to become a backup power supply; the solar inverter passes through the control panel An AC grid-connected power supply is transmitted to and from a mains grid-connected terminal; wherein, the control panel includes a manual transfer switch (MTS) for switching the power supply of the backup power outlets to the backup power supply or the AC grid-connected power supply.

Description

Multifunctional integrated E-S type grid-connected system energy storage cabinet

This creation is about a multifunctional integrated E-S type grid-connected system energy storage cabinet, especially an energy storage cabinet that can automatically or manually switch between mains power and backup power supply, and has a fire extinguishing function.

Electricity is already an indispensable necessity for supplying modern daily life. It is closely related to various electrical appliances and equipment that maintain people's lives. Once the power company's mains supply is unstable or natural disasters and other factors, the power supply may be interrupted. If there is no reserve power for emergency response, it may cause serious economic losses or even cause safety hazards.

At present, in order to solve the emergency power outage situation, there have been inventions related to the energy storage cabinet of the uninterruptible power system, which uses the converter to transmit the backup power for power supply. When the mains power fails, the converter can be used to activate the backup power for power supply, but Once the converter fails, there will be no power supply for the backup power, and it is impossible to switch back to the mains as the power supply, resulting in the inability to respond to emergency situations. Furthermore, because the energy storage cabinet has a large number of storage batteries, the storage battery High temperature will be generated during charging or discharging, and there may be a risk of fire. Therefore, how can the energy storage cabinet make the conversion of the power supply terminal in an emergency, and how can the storage battery of the energy storage cabinet catch fire in real time? Fire extinguishing equipment is the problem to be solved in this technical field.

The main purpose of this creation is to provide an energy storage cabinet that can automatically or manually switch between mains power and backup power as required, and has a fire extinguishing function.

The multi-functional integrated E-S grid-connected system energy storage cabinet belongs to a multi-functional grid-connected/off-grid shared energy storage system cabinet: it is designed to meet the IP level of CNS 14165 touching dangerous parts, and can pass through the battery. Energy storage equipment that can output power to the grid (discharge), or obtain power from the grid for storage (charge). At the same time, it has the ability to provide outdoor mobile energy use. It can be plugged externally for load power and externally plugged for single-phase 220V power grid-connected power supply and charging control. Provide intelligent and convenient integrated solar energy storage solutions, and with advanced module modular design, you can mount and integrate important components such as single-phase and three-phase energy storage inverters, switch boxes, batteries, and battery cabinets arbitrarily. It is extremely convenient to use, with intelligent management and control of various working modes, and can flexibly realize power dispatching, power storage and power load management, and easily become the master of power. At the same time, the practical appearance design can perfectly integrate with modern homes, and the matching design of equipment with IP54, IP55, IP56 or IP65 protection level is suitable for various indoor and outdoor installation requirements.

In order to achieve the above and other purposes, this creation provides a multi-functional integrated E-S grid-connected system energy storage cabinet, which includes: a cabinet, which contains a solar converter, a control panel, and a storage battery A module, a plurality of backup power sockets, and a utility grid-connected socket; wherein, the solar inverter, the power storage battery module, the backup power sockets, and the utility grid-connected socket are respectively electrically connected to the control panel; Wherein, the solar converter is electrically connected to a solar photovoltaic panel (PV) outside the cabinet through the control panel, and the solar photovoltaic panel (PV) transmits electric energy to the solar converter, and the solar converter is then The electric energy is transmitted through the control panel to the power storage battery module for storage or transmitted to the backup power outlets to become a backup power supply; wherein the control panel is electrically connected to a mains grid-connected terminal outside the cabinet, so that the The solar converter transmits an AC grid-connected power supply to the mains grid-connected terminal through the control panel; wherein, the control panel includes a manual transfer switch (MTS), and the manual transfer switch (MTS) has three nodes, each of which is The nodes are respectively connected to at least one of the backup power socket, the backup power supply and the AC grid-connected power supply, and each of these nodes forms a conducting circuit after being connected to each other, and the manual switching The switch (MTS) is used to switch the connection of each node, so that the backup power socket can be selectively conducted with the backup power supply or the AC grid-connected power supply.

A: Cabinet

B: Solar inverter

B01: Power automatic transfer switch (ATS)

C: control panel

C01: Manual transfer switch (MTS)

C11: Node 1

C12: Node 2

C13: Node Three

C14: Conduction circuit

C02: Isolation switch

C03:Transformer

D: fire ball

E: Storage battery module

E01: lithium battery

E02: Battery Management System (BMS)

F: Spare power socket

G: slot

G01: Transparent waterproof cover

H: cooling hole

I: mains grid-connected socket

I01: Mains grid-connected terminal

I02: AC grid-connected power supply

P: Solar Photovoltaic Panel (PV)

P01: Electric energy

Z: backup power

Fig. 1 is a three-dimensional schematic diagram of the interior of an energy storage cabinet according to an embodiment of the invention.

Fig. 2 is an external perspective schematic diagram of an energy storage cabinet according to an embodiment of the invention.

FIG. 3 is a schematic block diagram of the connection relationship of components and circuits in an embodiment of the present invention.

Please refer to Fig. 1 to Fig. 3, what is shown in the figure is an embodiment of a multifunctional integrated E-S type grid-connected system energy storage cabinet based on the creation, which includes: a cabinet A, and the inside of the cabinet A contains a solar energy Converter B, a control panel C, a fire extinguishing ball D, a power storage battery module E, two backup power sockets F and a mains grid-connected socket I. The solar inverter B serves as a power conversion system (Battery Conversion System, PCS). Control panel C is also called switchboard.

The solar converter B, the power storage battery module E, the backup power outlets F and the mains grid-connected outlet I are electrically connected to the control panel C, respectively. Therefore, through the switch of the control panel C, the solar inverter B, the power storage battery module E, the backup power outlets F and the mains grid-connected outlet I can be electrically controlled. The solar converter B is also electrically connected to the storage battery module E, the backup power socket F and the mains grid-connected socket I through the control panel C. The solar converter B is electrically connected to a mains grid-connected terminal I01 outside the cabinet A through the control panel C. Therefore, the solar converter B communicates with the mains grid-connected terminal I01 through the control panel C to communicate with each other. Power I02.

The solar inverter B is electrically connected to a solar photovoltaic panel (PV) P outside the cabinet A through the control panel C. Solar photovoltaic panels (PV) P absorb sunlight to form electrical energy P01 and convert it into direct current source, and then transmit the DC power to the solar inverter B through the control panel C, and the solar inverter B will convert the DC power into an AC power, and preferentially convert the AC power into an AC grid-connected power supply I02 and then transmit it to the mains for grid-connection The terminal I01 is used for external loads. If there is excess power P01, the DC power is transmitted to the storage battery module E, so that the storage battery module E stores the DC power. The solar inverter B can also convert the DC power received from the solar photovoltaic panel (PV) P into an AC power source to become a backup power source Z, and then output it to a backup power socket F. It is worth mentioning that the backup power outlet F here can also be connected to an emergency load under normal conditions, and the backup power supply Z serves as the uninterruptible power supply system for the emergency load.

The solar inverter B communicates with the electrical storage battery module E through a battery management system (Battery Management System, BMS) E02 of the electrical storage battery module E, and the solar inverter B can communicate with the electrical storage battery module E through the battery management system. (Battery Management System, BMS) E02 obtains the voltage, current, current power, and charging and discharging conditions of the storage battery module E, and can control the input and output power of the storage battery module E as well as the charging and discharging time to prevent or avoid Abnormal conditions such as excessive charging and discharging of the storage battery module E or excessive temperature.

The solar converter B is a bidirectional energy storage type solar converter B. Therefore, in addition to the conversion of DC power and AC power, the solar converter B can also control the mains grid-connected terminal I01 and storage power through the control panel C. The electric battery module E performs bidirectional work of charging or discharging.

That is, the solar inverter B can convert the solar power generated by the solar photovoltaic panel (PV) P or the power stored in the storage battery module E through the control panel C, and convert the DC power into an AC power to form an AC grid-connected power supply I02, and then transmit the AC grid-connected power supply I02 to the mains grid-connected terminal I01 for use by external loads. The solar converter B can also accept the AC grid-connected power I02 provided by the grid-connected terminal I01 of the utility power, and convert the AC power into DC power through the solar converter B and transmit it to the storage battery module E for storage.

The solar inverter B can transmit the DC power generated by the solar photovoltaic panel (PV) P to the storage battery module E for power storage, and can also receive the DC power output from the discharge of the storage battery module E, and then the solar inverter Converter B then converts the received DC power into AC power to form a backup power source Z and then outputs it to the backup power socket F for the insertion of external load appliances, or the solar inverter B converts the received DC power into AC power to form an AC grid-connected power source After I02, it is output to the mains grid-connected terminal I01 for use.

The solar converter B has an automatic power switch B01. Through the automatic power switch B01, the solar converter B can use the automatic power switch B01 to automatically switch the main The power supply is converted into the DC power stored by the storage battery module E, or the DC power transmitted by the solar photovoltaic panel (PV) P, and the DC power is converted into AC power to form a backup power Z and transmitted to the backup The power outlet F is used, or the AC grid-connected power supply I02 is formed to output to the mains grid-connected terminal I01 for use, without affecting the operation of the external load.

The power storage battery module E, (one of them) the backup power socket F, the solar photovoltaic panel (PV) P, and the grid-connected socket I of the mains are all separately connected to the solar converter B, and the control panel C has a The manual transfer switch (MTS) C01, the manual transfer switch (MTS) C01 has three nodes, each of which is connected to the backup power socket F, the backup power source Z and the AC grid-connected power source I02 respectively, and these nodes are respectively node one C11, Node two C12 and node three C13, the node one C11 is connected to at least one of the backup power socket F, the node two C12 is connected to the backup power supply Z, the node three C13 is connected to the AC grid-connected power supply I02, and the nodes are connected to each other After the connection, a conduction circuit is formed each, and the manual transfer switch (MTS) C01 is used to manually switch the conduction state between nodes, so that node 1 C11 can be selectively converted to be connected to node 2 C12 or node 3 C13, thereby forming a conduction circuit C14.

The user can use the manual transfer switch (MTS) C01 to manually switch the conduction state between the mandatory nodes, and then switch the conversion of the power supply to the standby power socket F. When the manual transfer switch (MTS) C01 switches to node 1 C11 and node 2 C12 for conduction connection, it can convert the power supply of the backup power socket F to the backup power supply Z output by the solar converter B, when switching to the node When the first C11 and the third node C13 are connected, the power supply of the spare power outlet F is transferred to the mains AC grid-connected power supply I02 of the mains grid-connected terminal I01, and the manual transfer switch (MTS) C01 can also connect all nodes All the paths are cut off, so that the paths between the nodes are not conducted and the connections are closed.

Generally, the load power supplied externally at all times is controlled by the solar converter B. When the mains power supply is stable, the solar converter B will give priority to the DC power generated by the solar photovoltaic panel (PV) P or the DC power in the storage battery module E. After being converted into AC power, an AC grid-connected power supply I02 is formed and output to the mains grid-connected terminal I01 for use by external loads, so as to save the consumption of mains power.

However, when the solar converter B fails, the automatic power transfer switch (ATS) B01 of the solar converter B cannot perform automatic switching at this time, so the backup power Z cannot continue to be supplied to the external load. At this time, the user can use the manual transfer switch (MTS) C01 of the control panel C to manually switch the power supply, disconnect the connection between node one C11 and node two C12, and switch to connect node one C11 and node three C13. The solar inverter B is cut off and switched to be supplied by the mains grid-connected terminal I01, so that the power supply of the backup power socket F is switched from the backup power supply Z to the mains grid-connected terminal I01 to continue the AC grid-connected power supply from the mains I02 supply, and the mains grid-connected terminal I01 is electrically connected to the mains grid-connected socket I, so whether it is the external load of the original mains grid-connected terminal I01, the backup power socket F, or the power supply of the mains grid-connected socket I are not affected by solar energy. Influenced by the failure of the converter B, it can continue to receive the AC grid-connected power supply I02 provided by the grid-connected terminal I01 of the grid.

When the solar converter B needs to be overhauled, the control switch on the control panel C can be used to directly connect the solar converter B with the solar photovoltaic panel (PV) P, the power storage battery module E, and the mains grid-connected terminal I01 Cut off the power among the three, and then use the manual transfer switch (MTS) C01 to directly connect the standby power socket F The power is supplied by the grid-connected terminal I01 of the mains, so that convenient and safe maintenance can be directly carried out without affecting the power consumption of the load.

The storage battery module E contains a plurality of lithium batteries E01. Since the lithium batteries E01 are prone to high temperature during charging and discharging, if they are placed in a long-term environment with high temperature, or if the wiring diameter specifications are used incorrectly, there may be a danger of fire. When the lithium battery E01 catches fire, if the fire extinguishing ball D above the lithium battery E01 is heated by the fire source, the fire extinguishing ball D will spray dry powder to extinguish the fire on the storage battery module E, which improves the safety of the energy storage cabinet and reduces the Accidentally expand and reduce damage.

The control panel C further has an isolating switch C02, and the control panel C uses the isolating switch C02 to control the storage battery module E. When the voltage or current of the lithium battery E01 of the storage battery module E is unstable, use the switch on the control panel C The isolating switch C02 turns off the power storage battery module E, so that the power storage battery module E no longer performs power storage or discharge work. The control panel C also has a transformer C03. According to the transformer C03, the voltage output from the backup power supply Z to the backup power socket F can be changed, so that the voltage of the backup power socket F can be at least 110V and 220V, which can meet the needs of various electrical equipment specifications. .

There are a plurality of slots G on the front of the cabinet A shell, these slots G are set relative to the positions of the solar inverter B, the control panel C and the spare power socket F, and each of the slots G has a transparent waterproof outer cover G01 covers the outward opening of each slot G, and the transparent waterproof cover G01 covers the slot G, so that external dust or moisture will not enter the cabinet A through the slot G and cause pollution, and can be directly observed from the outside The status of the light signal of the solar inverter B, and when it is necessary to switch the backup power supply Z or overhaul urgently, the transparent waterproof outer cover G01 can be lifted to manually switch control or overhaul the control panel C. The transparent waterproof outer cover G01 can also be lifted immediately to connect the power supply directly to the spare power socket F or the mains grid-connected socket I, instead of opening the entire cabinet A shell to insert the spare power socket F or the mains grid-connected socket I.

The two opposite sides of the shell of the cabinet body A have at least one heat dissipation hole H. In this embodiment, the two opposite sides each have two heat dissipation holes H. At least one of the heat dissipation holes H has a heat dissipation fan. Using the heat dissipation hole H and the heat dissipation fan The matching enables the high temperature inside the cabinet A to quickly dissipate to the outside of the cabinet A, reduces the high temperature generated when the energy storage cabinet transmits current, and prolongs the service life of each component of the multifunctional integrated "E-S" type grid-connected system energy storage cabinet.

To sum up, the multi-functional integrated "E-S" type grid-connected system energy storage cabinet can simultaneously use solar energy and mains power as backup power Z for energy storage, and can also use power to automatically switch when the mains grid-connected terminal I01 is powered off The switch (ATS) B01 automatically converts the power supply to the backup power Z output by the solar photovoltaic panel (PV) P or the storage battery module E, and more importantly, when the solar converter B fails, it can be used immediately The manual transfer switch (MTS) C01 converts the power supply to be supplied by the mains grid-connected terminal I01, so that no matter the mains power failure of the mains grid-connected terminal I01 or the failure of the solar inverter B, there is a contingency plan to continue to provide power . Moreover, the multi-functional integrated "E-S" grid-connected system energy storage cabinet also includes a design of a fire extinguishing ball D. Once the storage battery module E catches fire, the fire extinguishing ball D can be used to extinguish the fire immediately, improving the safety of the energy storage cabinet. Sex, reducing the doubts of accidents in the storage battery module E. In this creation, the spare power socket F and the mains grid-connected socket I are set in the cabinet A, and the spare power socket F and the mains grid-connected socket I can be directly inserted from the outside of the cabinet A for use without opening the entire cabinet A shell. It is very convenient and practical to plug in the spare power socket F and the mains grid-connected socket I for power transmission in an emergency. This creation solves the problem that the energy storage cabinet cannot continue to supply power when the converter fails, so that the backup power supply Z and the AC grid-connected power supply I02 of the mains can control the conversion supply in a timely manner according to the situation, and also improve the safety and security of the energy storage cabinet in use. Convenience achieves the effect of integrating multiple functions into one cabinet.

This multifunctional integrated E-S type grid-connected system energy storage cabinet complies with the energy capacity described in the grid-connected energy storage system category name definition and description table in the outdoor battery energy storage system field verification technical specification "E-S" type grid-connected energy storage system less than or equal to 20KWH. The outer box shall be tested according to 5.2.2.4.2.3 of IEC 62477-1:2012. The result of the static test shall be the same as the measurement result of CNS 62933-5-2 8.2.10, and there shall be no damage that may cause contact with dangerous parts. After this test, the grid-connected energy storage system should be the same as the dielectric test results of CNS 62933-5-2 8.2.1.4, without any electric shock hazard.

This creative multi-functional integrated E-S type grid-connected system energy storage cabinet system includes:

A. Cabinet: The energy storage cabinet is made of stainless steel powder paint, which meets the protection level of CNS 14165 (version 104), or the protection level of IEC 60529 (version 2013). The cabinet contains a power conversion system (Power Conversion System, PCS) and connecting battery system and transformer, switchgear, control panel, cooling device and fire extinguishing device, etc.

B. A power conversion system (Power Conversion System, PCS): also known as a power conditioner, which can perform AC, DC conversion and bidirectional conversion of electric energy between the energy storage system and the grid-connected point, and can accept commands from the energy storage management system Provide energy management, scheduling and power quality improvement functions. Or called a bidirectional energy storage inverter, which can meet the needs of photovoltaic and energy storage systems at the same time, can realize grid-connected and off-grid functions, and can realize bidirectional control and intelligent control of electric energy, and then realize bidirectional energy storage with highly autonomous energy scheduling inverter. Compatible with a variety of batteries for perfect BMS matching, more charging/discharging power options, and off-grid switching time of less than 10ms, supports DC arc protection, standard surge secondary protection on the DC side to provide safe power.

At the same time, the power conversion system (PCS) should meet the following requirements

1. Grid connection: should comply with IEEE 1547 (60Hz) (2003 edition) and IEEE 1547.1 (2005 edition).

2. Electrical safety regulations: should comply with IEC 62477-1 (2012 edition) or UL 1741 (2010 edition).

3. Electromagnetic compatibility: one of the following requirements shall be met, and a test report or verification certificate shall be attached:

(1) CNS 14674-1 (2006 edition) and CNS 14674-3 (2022 edition).

(2) IEC/EN 61000-6-1 (2005 edition) and IEC/EN 61000-6-3 (2020 edition).

(3) FCC part15 class A or B. Those installed in industrial areas may meet one of the following requirements:

(4) CNS 14674-2 (2006 edition) and CNS 14674-4 (2016 edition).

(5) IEC/EN 61000-6-2 (2005 edition) and IEC/EN 61000-6-4 (2011 edition).

4. The FCC part15 class A or B compliance document may be issued by a Conformity Assessment Body (CAB) agency recognized by the FCC.

C. One control panel: It is used as an operation protection and isolation device when connecting external DC/AC and other energy sources, such as connecting solar photovoltaic panels, connecting batteries, connecting external power grids, connecting external loads, etc.

D. One fire extinguishing ball: used as an auxiliary subsystem (Auxiliary subsystem) for fire extinguishing function.

H. Cooling hole/fan: used as an auxiliary subsystem (Auxiliary subsystem) for HVAC (heating, ventilation and air conditioning) functions.

E. Several power storage battery modules: cooperate with the battery management system (Battery Management System, BMS) to control, monitor and optimize the performance of the battery in the energy storage system, and can collect all the data of the battery, such as voltage, current, temperature, etc. And these data are divided into overvoltage, low voltage, discharge overcurrent, charge overcurrent, high temperature charge and discharge, low temperature charge and discharge, short circuit, etc. When abnormal conditions occur, the connection between the battery and the energy storage system can be disconnected. The battery module meets the following requirements:

1. CNS 62619 (109th edition) battery system (group) (burning test must be performed) or CNS 63056 (110th edition) small household energy storage battery system (group) requirements (burning test must be performed).

E02. Battery Management System (BMS): meet one of the following requirements: i. IEC 60730-1 (2013 edition) Annex H (Class B or C) above; ii. IEC 61508 (2010 edition) safety integrity Level 2 and above; iii. UL 60730-1 (2016 edition) Annex H (Class B or C) above; iv. UL 991 (2004 edition) and UL 1998 (2013 edition); iv. ISO 13849-1 (2015 edition) , ISO 13849-2 (2012 edition) performance level (PL) "C".

F. 2 spare power sockets

I. Mains grid-connected socket 1

C03. Transformer: 220V to 110V

B: Solar inverter

C: control panel

C01: Manual transfer switch (MTS)

B01: Power automatic transfer switch (ATS)

C11: Node 1

C12: Node 2

C13: Node Three

C14: Conduction circuit

C02: Isolation switch

C03:Transformer

E: Storage battery module

E02: Battery Management System (BMS)

F: Spare power socket

I: mains grid-connected socket

P: Solar Photovoltaic Panel (PV)

P01: Electric energy

I01: Mains grid-connected terminal

I02: AC grid-connected power supply

Z: backup power

Claims (10)

A multi-functional integrated E-S type grid-connected system energy storage cabinet, which includes: a cabinet body, which contains a solar inverter, a control panel, a power storage battery module, a plurality of backup power sockets and a Mains grid-connected socket; wherein, the power storage battery module, one of the backup power sockets, a solar photovoltaic panel (PV) and the mains grid-connected socket have established a separate circuit connection with the solar converter , the circuit connections are controlled by the control panel; wherein, the solar photovoltaic panel (PV) transmits an electrical energy to the solar inverter, and the solar inverter transmits the electrical energy to the storage battery through the control panel The module stores or transmits electricity to these backup power sockets; wherein the control panel is electrically connected to a grid-connected terminal of the mains outside the cabinet, so that the solar converter transmits a power to the grid-connected terminal of the utility power through the control panel. AC grid-connected power supply; wherein, the control panel includes a manual transfer switch (MTS), and the manual transfer switch (MTS) has three nodes, each of which is connected to at least one backup power socket, a backup power supply and the AC parallel Grid power connection, the manual transfer switch (MTS) is used to switch the connection of each node, so that the backup power socket can selectively conduct with the backup power supply or the AC grid-connected power supply. The multifunctional integrated E-S grid-connected system energy storage cabinet as described in claim 1, wherein the solar converter includes an automatic power transfer switch (ATS), and the automatic power transfer switch (ATS) is used to When the network end cannot supply the AC grid-connected power of the mains, the power supply will be automatically switched to the backup power. The multifunctional integrated E-S grid-connected system energy storage cabinet as described in claim 1, wherein the solar converter converts the electric energy into alternating current to form the AC grid-connected power supply, and transmits the AC grid-connected power supply to the utility power and network end. The multifunctional integrated E-S type grid-connected system energy storage cabinet as described in claim 1, wherein the solar converter communicates with the storage battery through a battery management system (Battery Management System, BMS) of the storage battery module module for communication connection. The multifunctional integrated E-S grid-connected system energy storage cabinet as described in claim 1, wherein the front of the cabinet shell contains a plurality of slots, and the slots are relatively to the solar converter, the control panel, the The standby power socket and the location of the mains grid-connected socket are set. The multifunctional integrated E-S type grid-connected system energy storage cabinet as described in claim 5, wherein each of the slots has a transparent waterproof cover covering the outward opening of each slot. The multi-functional integrated E-S grid-connected system energy storage cabinet as described in claim 1, wherein the cabinet contains a fire extinguishing ball, and the fire extinguishing ball fires the power storage battery module when the power storage battery module catches fire. Extinguishing. The multifunctional integrated E-S type grid-connected system energy storage cabinet as described in claim 1, wherein the solar converter is a bidirectional energy storage solar converter, which is used to connect the power storage battery module and the utility power to the grid charging or discharging bidirectional work. The multifunctional integrated E-S grid-connected system energy storage cabinet as described in claim 1, wherein the control panel includes an isolating switch, and the control panel uses the isolating switch to control the charging and discharging of the storage battery module. The multifunctional integrated E-S type grid-connected system energy storage cabinet as described in Claim 1, wherein the two opposite sides of the cabinet shell each have at least one cooling hole.

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