Outdoor cabinet, control power supply acquisition system, control system and temperature control system

Abstract

The utility model relates to the technical field of energy storage, in particular to an outdoor cabinet, a control power supply acquisition system, a control system and a temperature control system. The inner side of the cabinet body is provided with a plurality of slots in a layered manner; the plurality of battery packs are inserted into the slots in the upper layer; the liquid cooling unit assembly is inserted into a slot below the battery pack; and the PCS is inserted into a slot positioned below the liquid cooling unit assembly, and liquid cooling design is adopted, so that the heat exchange efficiency is improved, the auxiliary energy consumption of the system is reduced, the circulation efficiency of the system is improved, the noise of the unit is reduced, and the occupied space is saved. According to the unique layout design, the system integration degree is greatly improved, modularization is adopted, the occupied area is saved, and the product transportation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly relates to an outdoor cabinet, a control power acquisition system, a control system and a temperature control system. Background Art

[0002] With the rapid development of the new energy energy storage industry, industrial and commercial outdoor energy storage systems are increasingly favored by the market. Customers' requirements for energy storage systems include product safety and reliability, improved energy density, extended system service life, and convenient installation and maintenance.

[0003] Currently, most industrial and commercial energy storage systems are air-cooled battery packs, which use air conditioners to raise and lower the temperature. This method has low heat exchange efficiency and uneven heat dissipation. The air-cooled energy storage converter PCS uses natural convection for heat dissipation, and also has problems such as low efficiency and poor stability. Summary of the Utility Model

[0004] Therefore, the utility model aims to overcome the technical problems that need to be solved in the prior art, so as to provide an outdoor cabinet, a control power acquisition system, a control system and a temperature control system.

[0005] The utility model provides an outdoor cabinet, including:

[0006] A cabinet body, with multiple slots arranged in layers on the inner side;

[0007] Multiple battery packs, inserted into the slots located on the upper layer;

[0008] A liquid cooling unit assembly, inserted into the slot located below the battery pack;

[0009] An energy storage converter PCS, inserted into the slot located below the liquid cooling unit assembly;

[0010] The liquid cooling unit assembly is respectively communicated with the liquid inlets and outlets arranged on the battery pack and the energy storage converter PCS through a pipeline assembly, and the liquid cooling unit assembly provides cooling liquid for the pipeline assembly.

[0011] Further, it also includes:

[0012] A distribution box assembly, inserted into the slot located between the liquid cooling unit assembly and the energy storage converter PCS.

[0013] Further, the liquid cooling unit assembly includes a housing and liquid cooling equipment arranged in the housing. The housing is provided with two groups of liquid inlets and outlets communicated with the liquid cooling equipment. The liquid inlets and outlets in the same group on the housing are communicated with each other. The housing is provided with a front air inlet at the front end, a rear air outlet at the rear end, and a left air inlet and a right air inlet on both sides.

[0014] Further, both the battery pack and the power conversion system (PCS) for energy storage are provided with liquid cooling components, and the liquid cooling components are connected to the pipeline assembly through the liquid inlet and outlet provided on the battery pack and the PCS for energy storage.

[0015] Further, the pipeline assembly includes:

[0016] A first main path, which is communicated with the liquid outlet on the housing;

[0017] A plurality of first branch paths, one end of each of which is communicated with the first main path, and the other end of each of which is communicated with the liquid inlet on the battery pack;

[0018] A second main path, which is communicated with the liquid inlet on the housing;

[0019] A plurality of second branch paths, one end of each of which is communicated with the second main path, and the other end of each of which is communicated with the liquid outlet on the battery pack;

[0020] A third main path, which is an integrated circuit and includes two pipelines, one of which is connected between the liquid outlet on the housing and the liquid inlet of the PCS for energy storage, and the other pipeline is connected between the liquid outlet of the PCS for energy storage and the liquid inlet on the housing;

[0021] Wherein, the first main path and the second main path are respectively connected to the liquid outlet and the liquid inlet on the housing in the same group, and the third main path is connected to the liquid inlet and the liquid outlet on the housing in another group.

[0022] A control power acquisition system, which is used for the outdoor cabinet described above, includes:

[0023] A first path of power supply, an AC / DC switching power supply and a first diode are sequentially arranged between the AC power supply and the load, and are suitable for providing a normal DC24V power supply for the load;

[0024] A second path of power supply, a DC / DC switching power supply and a second diode are sequentially arranged between the PCS for energy storage and the load, or between the main circuit of the battery pack and the load, and are suitable for providing a standby DC24V power supply for the load.

[0025] A control system, which is used for the outdoor cabinet described above, and the power distribution unit (PDU) and the PCS for energy storage in the outdoor cabinet share a set of fuse, pre-charge circuit, main contactor circuit and Hall sensor circuit.

[0026] Further, the battery management main control unit (BMU) in the PDU is merged with the general control unit (BAU) of the distribution box assembly and is arranged in the distribution box assembly.

[0027] Further, the PCS for energy storage communicates with the battery management system (BMS);

[0028] Among them, in the pre-charging strategy, the executor is the pre-charging circuit in the energy storage converter PCS;

[0029] In current detection, the executor is the Hall sensor in the energy storage converter PCS, and the CAN communication information is shared with the battery management system BMS;

[0030] In the power-on strategy, both the battery management system BMS and the energy storage converter PCS are the strategy-making judgment parties. It is necessary to meet both conditions, and the executor is the main contactor in the energy storage converter PCS;

[0031] In the power-off strategy, both the battery management system BMS and the energy storage converter PCS are the strategy-making judgment parties. It is necessary to meet one of the conditions, and the executor is the main contactor in the energy storage converter PCS and the power control of the energy storage converter PCS. In terms of sequence, the energy storage converter PCS reduces its power first and then the main contactor is disconnected;

[0032] In the main contactor adhesion judgment and insulation detection, the execution circuit is the main contactor circuit in the energy storage converter PCS, and the CAN communication information is shared with the battery management system BMS. When the main contactor adheres, the battery management system BMS drives to disconnect the circuit breaker or disconnecting switch in the energy storage converter PCS;

[0033] In the battery protection strategy, the battery management system BMS is the strategy-making judgment party, and the executor is the main contactor in the energy storage converter PCS, the power control of the energy storage converter PCS, the circuit breaker or disconnecting switch. In terms of sequence, the energy storage converter PCS reduces its power first, then the main contactor is disconnected, and the circuit breaker or disconnecting switch is disconnected;

[0034] The charging and discharging strategy executor is the energy storage converter PCS.

[0035] A temperature control system is used for the above outdoor cabinet. The liquid cooling unit includes three heat cycles, which are the condenser cycle, the battery pack coolant cycle, and the energy storage converter PCS coolant cycle in sequence. A PTC heater is arranged in the battery pack coolant cycle, and heat is transferred between adjacent two cycles through a heat exchange plate;

[0036] During refrigeration, the heat transfer direction is: the energy storage converter PCS coolant cycle, the battery pack coolant cycle, and the condenser cycle;

[0037] During heating, the coolant in the battery pack coolant cycle is heated by the PTC heater. At the same time, the energy storage converter PCS works to dissipate heat and heats the coolant in the battery pack coolant cycle through the heat exchange plate.

[0038] The technical solution of the present utility model has the following advantages:

[0039] The outdoor cabinet, control power acquisition system, control system and temperature control system provided by the utility model adopt a liquid cooling design, which improves the heat exchange efficiency, reduces the auxiliary energy consumption of the system, improves the system circulation efficiency, reduces the noise of the unit, and saves the occupied space. This unique layout design greatly improves the system integration degree, adopts modularization, saves the floor area, and reduces the product transportation cost. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 Structural schematic diagram of the present utility model;

[0042] Figure 2 Structural schematic diagram of the pipeline assembly of the present utility model;

[0043] Figure 3 Structural schematic diagram of the housing of the present utility model;

[0044] Figure 4 Schematic diagram of the position of the rear air outlet of the present utility model;

[0045] Figure 5 Schematic diagram of the control power circuit principle of the present utility model;

[0046] Figure 6 Schematic diagram of the main circuit connection between the PDU and PCS in the prior art;

[0047] Figure 7 Schematic diagram of the main circuit inside the PCS of the present utility model;

[0048] Figure 8 Comparison diagram of the communication topology of the present utility model;

[0049] Figure 9 Function allocation diagram of the strategy in the prior art;

[0050] Figure 10 Function allocation diagram of the strategy of the present utility model;

[0051] Figure 11 Schematic diagram of the liquid cooling circulation system in the prior art;

[0052] Figure 12 Schematic diagram of the liquid cooling circulation system of the present utility model.

[0053] Explanation of the reference numerals;

[0054] 1. Cabinet; 2. Battery pack; 3. Liquid cooling unit assembly; 4. Energy storage converter PCS; 5. Distribution box assembly; 6. Housing; 7. Front air inlet; 8. Rear air outlet; 9. Left air inlet; 10. Right air inlet; 11. First main path; 12. First branch; 13. Second main path; 14. Second branch; 15. Third main path. Detailed implementation manners

[0055] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0056] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0057] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0058] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0059] Embodiment

[0060] As Figures 1 to 12 shown in the specific implementation manners of an outdoor cabinet, a control power acquisition system, a control system, and a temperature control system, the outdoor cabinet includes:

[0061] Cabinet 1, with multiple slots arranged in layers on the inner side. Among them, Cabinet 1 can also include a display light strip, a display screen assembly, a front air inlet 7 of Cabinet 1, a rear air outlet 8 of Cabinet 1, a rear air inlet of Cabinet 1, and a bottom air inlet of Cabinet 1 provided on it;

[0062] Battery packs 2, multiple in number, inserted into the slots located in the upper layer;

[0063] Liquid cooling unit assembly 3, inserted into the slot located below the battery pack 2;

[0064] Energy storage converter PCS 4, inserted into the slot located below the liquid cooling unit assembly 3;

[0065] The liquid cooling unit assembly 3 is respectively connected to the liquid inlet and outlet provided on the battery pack 2 and the energy storage converter PCS 4 through a pipeline assembly. The liquid cooling unit assembly 3 provides coolant to the pipeline assembly. The liquid cooling design is adopted, which improves the heat exchange efficiency, reduces the noise of the unit, and saves the occupied space. This unique layout design greatly improves the system integration degree. By adopting modularization, it saves the floor area and reduces the product transportation cost.

[0066] Furthermore, it further includes:

[0067] Distribution box assembly 5, inserted into the slot located between the liquid cooling unit assembly 3 and the energy storage converter PCS 4, taking into account the neatness of the wire routing arrangement. The outdoor cabinet can also include a fire protection assembly provided on the cabinet 1.

[0068] Furthermore, the liquid cooling unit assembly 3 includes a housing 6 and a liquid cooling device provided in the housing 6. The housing 6 is provided with two groups of liquid inlets and outlets communicated with the liquid cooling device. The liquid inlets and outlets in the same group on the housing 6 are mutually communicated. The housing 6 is provided with a front air inlet 7 at the front end, a rear air outlet 8 at the rear end, and a left air inlet 9 and a right air inlet 10 on both sides. The double independent waterway design is adopted, and the heat dissipation efficiency for the battery pack 2 and the energy storage converter PCS 4 is relatively high.

[0069] Furthermore, both the battery pack 2 and the energy storage converter PCS 4 are provided with liquid cooling components. The liquid cooling components can be liquid cooling pipes capable of circulating coolant, or liquid cooling strips capable of circulating coolant. This embodiment is not limited thereto. The liquid cooling components are connected to the pipeline assembly through the liquid inlets and outlets provided on the battery pack 2 and the energy storage converter PCS 4. The liquid cooling components are used to assist the coolant to absorb as much heat as possible in the battery pack 2 and the energy storage converter PCS 4.

[0070] Furthermore, the pipeline assembly includes:

[0071] The first main path 11, communicated with the liquid outlet on the housing 6;

[0072] There are multiple first branches 12, one end of each is connected to the first main path 11, and the other end is connected to the liquid inlet on the battery pack 2;

[0073] A second main path 13 is connected to the liquid inlet on the housing 6;

[0074] There are multiple second branches 14, one end of each is connected to the second main path 13, and the other end is connected to the liquid outlet on the battery pack 2;

[0075] A third main path 15 is an integrated circuit, including two pipelines. One pipeline is connected between the liquid outlet on the housing 6 and the liquid inlet of the energy storage converter PCS4, and the other pipeline is connected between the liquid outlet of the energy storage converter PCS4 and the liquid inlet on the housing 6;

[0076] Among them, the first main path 11 and the second main path 13 are respectively connected to the liquid outlet and the liquid inlet on the housing 6 in the same group, and the third main path 15 is connected to the liquid inlet and the liquid outlet of another group on the housing 6. The coolant flows through the battery pack 2 and the energy storage converter PCS4 respectively after passing through the liquid cooling unit, and then cools the battery pack 2 and the energy storage converter PCS4.

[0077] A control power acquisition system is used for the above outdoor cabinet. The improvement of the electrical circuit part includes:

[0078] For the first path of power supply, an AC / DC switching power supply and a first diode are sequentially arranged between the AC power supply and the load, and are suitable for providing a normal DC24V power supply to the load;

[0079] For the second path of power supply, a DC / DC switching power supply and a second diode are sequentially arranged between the energy storage converter PCS4 and the load, or between the main circuit of the battery pack 2 and the load, and are suitable for providing a standby DC24V power supply to the load.

[0080] In the prior art, generally, after the AC power supply passes through the UPS, the AC / DC switching power supply provides the DC24V control power supply. So that after the AC power supply loses power, the UPS battery is inverted to meet the second path of power supply. However, its disadvantages are obvious:

[0081] ① The UPS is in a continuous online floating charge state, with a short lifespan and large losses.

[0082] ② The operating temperature is generally 0 - 40°C, and the environmental adaptability is poor.

[0083] ③ When the UPS fails, the energy storage system loses power, reducing the reliability and safety at the system level.

[0084] ③ After configuring a necessary temperature control system for the UPS, the overall efficiency of the energy storage system is reduced.

[0085] ④ It occupies the internal space of the energy storage system, which is not conducive to the miniaturization and high density of the system.

[0086] The control power supply of this application is DC24V, and the dual power supply circuit extends to the DC24V level for switching, improving the power supply reliability; the UPS is cancelled, reducing the system failure rate.

[0087] For the detailed working principle, see Figure 5 : Schematic diagram of the control power supply circuit

[0088] Set the DC output voltage of the AC / DC switching power supply to DC25V, and set the DC output voltage of the DC / DC switching power supply to DC24V. When the first power supply supplies power, the first diode conducts and the second diode cuts off. The control power supply is supplied by the first power supply.

[0089] When the first power supply loses power, the first diode cuts off and the second diode conducts. The control power supply is supplied by the second power supply.

[0090] The switching time is the on-off time of the diode, which is a seamless switch.

[0091] A control system is used for the outdoor cabinet described above. Among them, the electrical circuit part is improved as follows: the power distribution unit PDU and the energy storage converter PCS4 in the outdoor cabinet share a set of fuse, pre-charge circuit, main contactor circuit and Hall sensor circuit.

[0092] In the prior art, for the outdoor cabinet energy storage system, the prefabricated cabin multi-cluster control architecture is generally adopted. There is a PDU high-voltage box, and through its internal DC circuit, the DC system of this cluster of batteries is managed. Generally, a modular PCS is integrated inside the outdoor cabinet, and there is also a set of DC circuits inside the PCS. The DC circuits and function settings between the two overlap partially, and the function of the PCS cannot be fully utilized, which is not conducive to the integration and fusion of the whole system.

[0093] The improvement points of this application: cancel the PDU, simplify the control architecture, and strengthen the control function of the energy storage converter PCS4. Cancel the PDU, merge the overlapping parts of its hardware circuit functions with the energy storage converter PCS4, retain the non-overlapping parts, and integrate them inside the energy storage converter PCS4. For example Figure 6 , in the main circuits inside the PDU and the main circuits inside the PCS, the fuse functions overlap and can be merged; the pre-charge circuit and the main contactor circuit functions overlap and can be merged; the switch circuit is retained and can be integrated inside the energy storage converter PCS4; the Hall sensor circuit functions overlap and can be merged.

[0094] Further, the Battery Management Master Unit (BMU) in the Power Distribution Unit (PDU) is merged with the Total Control Unit (BAU) of the distribution box assembly 5 and is arranged inside the distribution box assembly 5. In the prior art, generally, there is a Collection Unit (CMU) inside each battery PACK to collect information such as the operating voltage and temperature of the battery. Multiple CMUs communicate with the Master Control Unit (BMU) in the Power Distribution Unit (PDU) in a daisy chain manner. The Battery Management Master Unit (BMU) in the Power Distribution Unit (PDU) communicates with the Total Control Unit (BAU) in the distribution box via CAN to form a complete battery management system.

[0095] The communication topology part of the energy storage system is improved as follows: After canceling the Power Distribution Unit (PDU), the BMU inside it can be set together with or merged into the distribution box along with the Total Control Unit (BAU). This simplifies the communication architecture and improves communication efficiency. See Figure 8 : Comparison diagram of communication topologies.

[0096] Further, the Power Conversion System (PCS) 4 communicates with the Battery Management System (BMS);

[0097] Among them, in the pre-charging strategy, the executor is the pre-charging circuit inside the Power Conversion System (PCS) 4;

[0098] In the prior art, when the Power Distribution Unit (PDU) is retained, there are multiple overlapping strategies between the Power Conversion System (PCS) 4 and the Battery Management System (BMS). They are relatively independent of each other, with a weak information connection. Both the Power Distribution Unit (PDU) and the Power Conversion System (PCS) 4 are strategy executors. Some overlapping strategies restrict each other and cannot work simultaneously, which instead reduces the system reliability.

[0099] The Power Conversion System (PCS) 4 and the Power Distribution Unit (PDU) share the same DC system. Both the Power Conversion System (PCS) 4 and the Power Distribution Unit (PDU) perform insulation detection, but when using the voltage division method for detection, they cannot work properly. The pre-charging strategies of the Power Conversion System (PCS) 4 and the Power Distribution Unit (PDU) also cannot be used simultaneously.

[0100] Before improvement: Retain the Power Distribution Unit (PDU), and the Power Conversion System (PCS) 4 and the Battery Management System (BMS) are relatively independent and are respectively strategy executors.

[0101] The Power Conversion System (PCS) 4 as the strategy formulation and judgment party:

[0102] ① Pre-charging strategy, the executor is the pre-charging circuit inside the Power Conversion System (PCS) 4;

[0103] ② Insulation detection, the executor is the main contactor circuit inside the Power Conversion System (PCS) 4;

[0104] ③ Power on and off strategies, the executor is the main contactor inside the Power Conversion System (PCS) 4;

[0105] ④ Current detection, and the executor is the Hall sensor inside the energy storage converter PCS4.

[0106] The battery management system BMS serves as the strategy - making and judgment party:

[0107] ① The pre - charge strategy, and the executor is the pre - charge circuit inside the power distribution unit PDU;

[0108] ② Current detection, and the executor is the Hall sensor inside the power distribution unit PDU;

[0109] ③ The main contactor adhesion judgment, insulation detection, and power - on strategy. The execution loop is the main contactor loop inside the power distribution unit PDU. When the main contactor adheres, the battery management system BMS drives to disconnect the circuit breaker or disconnector inside the power distribution unit PDU;

[0110] ④ The power - off strategy, and the executors are the main contactor inside the power distribution unit PDU and the power control of the energy storage converter PCS4. In sequence, first reduce the power of the energy storage converter PCS4 and then disconnect the main contactor;

[0111] ⑤ The battery protection strategy, and the executors are the main contactor inside the power distribution unit PDU, the power control of the energy storage converter PCS4, the circuit breaker or disconnector. In sequence, first reduce the power of the energy storage converter PCS4, then disconnect the main contactor, and then disconnect the circuit breaker or disconnector;

[0112] ⑥ The charge and discharge strategy, and the executor is the power control of the energy storage converter PCS4.

[0113] After the control strategy part is improved: In current detection, the executor is the Hall sensor inside the energy storage converter PCS4, and the CAN communication information is shared with the battery management system BMS;

[0114] After canceling the power distribution unit PDU, the communication among the power distribution unit PDU, the energy storage converter PCS4, and the battery management system BMS is changed to the communication between the energy storage converter PCS4 and the battery management system BMS, making the strategies of the energy storage converter PCS4 and the battery management system BMS complement and integrate with each other. There is a lot of information interaction between the two, which is a strong information connection, improving the strategy operation efficiency. Only the energy storage converter PCS4 is the strategy executor, with a clearer division of labor, reducing the overlapping part, and enhancing the system reliability.

[0115] In the power - on strategy, both the battery management system BMS and the energy storage converter PCS4 serve as the strategy - making and judgment parties, and both need to be satisfied. The executor is the main contactor inside the energy storage converter PCS4;

[0116] In the power-down strategy, both the battery management system BMS and the energy storage converter PCS4 serve as the strategy-making judgment parties. It is necessary to meet one of them. The executor is the main contactor and the power control of the energy storage converter PCS4. In terms of sequence, first reduce the power of the energy storage converter PCS4 and then disconnect the main contactor;

[0117] In the main contactor adhesion judgment and insulation detection, the execution loop is the main contactor loop in the energy storage converter PCS4. The CAN communication information is shared with the battery management system BMS. When the main contactor adheres, the battery management system BMS drives to disconnect the circuit breaker or disconnecting switch in the energy storage converter PCS4;

[0118] In the battery protection strategy, the battery management system BMS serves as the strategy-making judgment party. The executor is the main contactor, the power control of the energy storage converter PCS4, the circuit breaker or disconnecting switch in the energy storage converter PCS4. In terms of sequence, first reduce the power of the energy storage converter PCS4, then disconnect the main contactor, and disconnect the circuit breaker or disconnecting switch;

[0119] The charging and discharging strategy executor is the energy storage converter PCS4.

[0120] A temperature control system is used for the outdoor cabinet described above. The liquid cooling unit includes three heat cycles, namely the condenser cycle, the battery pack coolant cycle, and the energy storage converter PCS coolant cycle in sequence. A PTC heater is provided in the battery pack coolant cycle, and heat is transferred between adjacent two cycles through a heat exchange plate;

[0121] During refrigeration, the heat transfer direction is: the energy storage converter PCS coolant cycle, the battery pack coolant cycle, and the condenser cycle;

[0122] During heating, the coolant in the battery pack coolant cycle is heated by the PTC heater. At the same time, the heat dissipated by the operation of the energy storage converter PCS4 heats the coolant in the battery pack coolant cycle through the heat exchange plate.

[0123] In the prior art, the battery pack adopts a liquid cooling method, and the liquid cooling unit refrigeration system; the PCS adopts an air cooling method, and the air conditioner or the cooling fan temperature control system. Two temperature control systems need to be configured in the cabinet, with high cost, high energy consumption, and low overall efficiency of the energy storage system.

[0124] The temperature of the liquid cooling plate of the battery pack is low. The air in contact with the cold plate is likely to have its water content exceed the saturation at low temperature, and there will be condensed water, which poses a safety hazard to the air-cooled energy storage converter PCS (the enclosure protection grade is IP20).

[0125] The improvement of the temperature control system in this application: The energy storage converter PCS4 adopts a liquid cooling method and shares a set of liquid cooling system with the liquid-cooled battery pack 2, with low cost, low energy consumption, and high overall efficiency of the energy storage system.

[0126] The enclosure protection level of the liquid-cooled energy storage converter PCS4 can reach IP65, and the condensed water at the liquid cooling plate of the external battery pack 2 will not pose a safety hazard to the energy storage converter PCS4.

[0127] R134a can be used as the refrigerant, and a 50% ethylene glycol aqueous solution can be used as the coolant.

[0128] The target temperature of the water inlet of the battery pack coolant circulation battery pack 2 is about 18°C. The target temperature of the water inlet of the cooling plate of the energy storage converter PCS where the energy storage converter PCS coolant circulates is about 40°C and slightly higher than the ambient temperature. At this time, there will be no condensed water on the cooling plate of the energy storage converter PCS4.

[0129] During refrigeration, three cycles operate, and the first water pump, the second water pump, and the variable frequency compressor all work.

[0130] This application adopts an independent dual-waterway liquid supply system. Through independent liquid cooling pipelines, different liquid flow rates and different initial liquid temperatures are provided for the battery pack 2 and the energy storage converter PCS4, accurately controlling the temperature of the battery cells and the energy storage converter PCS4, and improving the service life.

[0131] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An outdoor cabinet, characterized in that, Including: A cabinet body (1), with multiple slots arranged in layers on the inner side; Multiple battery packs (2), inserted into the slots in the upper layer; A liquid cooling unit assembly (3), inserted into the slot below the battery pack (2); A power conversion system for energy storage PCS (4), inserted into the slot below the liquid cooling unit assembly (3); The liquid cooling unit assembly (3) is respectively connected to the liquid inlet and outlet provided on the battery pack (2) and the power conversion system for energy storage PCS (4) through a pipeline assembly, and the liquid cooling unit assembly (3) provides coolant for the pipeline assembly.

2. The outdoor cabinet according to claim 1, characterized in that, It also includes: A distribution box assembly (5), inserted into the slot between the liquid cooling unit assembly (3) and the power conversion system for energy storage PCS (4).

3. The outdoor cabinet according to claim 1, characterized in that, The liquid cooling unit assembly (3) includes a housing (6) and liquid cooling equipment arranged in the housing (6). Two groups of liquid inlets and outlets connected to the liquid cooling equipment are provided on the housing (6). The liquid inlets and outlets in the same group on the housing (6) are interconnected. An air inlet (7) is provided at the front end, an air outlet (8) is provided at the rear end, a left air inlet (9) and a right air inlet (10) are provided on both sides of the housing (6).

4. The outdoor cabinet according to claim 1, characterized in that, Both the battery pack (2) and the power conversion system for energy storage PCS (4) are provided with liquid cooling components, and the liquid cooling components are connected to the pipeline assembly through the liquid inlets and outlets provided on the battery pack (2) and the power conversion system for energy storage PCS (4).

5. The outdoor cabinet according to claim 3, characterized in that, The pipeline assembly includes: A first main pipeline (11), connected to the liquid outlet on the housing (6); Multiple first branch pipelines (12), one end of each being connected to the first main pipeline (11), and the other end being connected to the liquid inlet on the battery pack (2); A second main pipeline (13), connected to the liquid inlet on the housing (6); Multiple second branch pipelines (14), one end of each being connected to the second main pipeline (13), and the other end being connected to the liquid outlet on the battery pack (2); A third main pipeline (15), an integrated pipeline, including two pipelines, one of which is connected between the liquid outlet on the housing (6) and the liquid inlet of the power conversion system for energy storage PCS (4), and the other pipeline is connected between the liquid outlet of the power conversion system for energy storage PCS (4) and the liquid inlet on the housing (6); Among them, the first main pipeline (11) and the second main pipeline (13) are respectively connected to the liquid outlet and liquid inlet in the same group on the housing (6), and the third main pipeline (15) is connected to the other group of liquid inlet and liquid outlet on the housing (6).

6. A control power acquisition system for an outdoor cabinet as described in any one of claims 1 - 5, characterized in that, Including: A first power supply path, an AC / DC switching power supply and a first diode are sequentially arranged between an AC power supply and a load, suitable for providing a normal DC24V power supply to the load; A second power supply path, between the power conversion system for energy storage PCS (4) and the load, or between the main circuit of the battery pack (2) and the load, a DC / DC switching power supply and a second diode are sequentially arranged, suitable for providing a standby DC24V power supply to the load.

7. A control system for an outdoor cabinet as described in any one of claims 1 - 5, characterized in that, The power distribution unit PDU and the power conversion system for energy storage PCS (4) in the outdoor cabinet share a set of fuse, pre-charge circuit, main contactor circuit and Hall sensor circuit.

8. The control system according to claim 7, wherein The battery management master unit BMU in the power distribution unit PDU is merged with the master control unit BAU of the distribution box assembly (5) and is arranged inside the distribution box assembly (5).

9. The control system according to claim 7, wherein The energy storage converter PCS (4) communicates with the battery management system BMS; Among them, in the pre-charging strategy, the executor is the pre-charging circuit in the energy storage converter PCS (4); In current detection, the executor is the Hall sensor in the energy storage converter PCS (4), and the CAN communication information is shared with the battery management system BMS; In the power-on strategy, both the battery management system BMS and the energy storage converter PCS (4) are the strategy-making judgment parties and need to be satisfied simultaneously. The executor is the main contactor in the energy storage converter PCS (4); In the power-off strategy, both the battery management system BMS and the energy storage converter PCS (4) are the strategy-making judgment parties and need to meet one of them. The executor is the main contactor in the energy storage converter PCS (4) and the power control of the energy storage converter PCS (4). In terms of sequence, the energy storage converter PCS (4) is first powered down and then the main contactor is disconnected; In the main contactor adhesion judgment and insulation detection, the execution loop is the main contactor loop in the energy storage converter PCS (4), and the CAN communication information is shared with the battery management system BMS. When the main contactor adheres, the battery management system BMS drives to disconnect the circuit breaker or disconnector in the energy storage converter PCS (4); In the battery protection strategy, the battery management system BMS is the strategy-making judgment party, and the executor is the main contactor in the energy storage converter PCS (4), the power control of the energy storage converter PCS (4), the circuit breaker or disconnector. In terms of sequence, the energy storage converter PCS (4) is first powered down, then the main contactor is disconnected, and the circuit breaker or disconnector is disconnected; The charge and discharge strategy executor is the energy storage converter PCS (4).

10. A temperature control system for an outdoor cabinet according to any one of claims 1 - 5, characterized in that, The liquid cooling unit includes three heat cycles, namely the condenser cycle, the battery pack coolant cycle, and the energy storage converter PCS coolant cycle in sequence. A PTC heater is arranged in the battery pack coolant cycle, and heat is transferred between adjacent two cycles through a heat exchange plate; During refrigeration, the heat transfer direction is: the energy storage converter PCS coolant cycle, the battery pack coolant cycle, and the condenser cycle; During heating, the coolant in the battery pack coolant cycle is heated by the PTC heater. At the same time, the energy storage converter PCS (4) works to dissipate heat and heats the coolant in the battery pack coolant cycle through the heat exchange plate.

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