Energy storage converter of energy storage system, energy storage system and electric equipment

Abstract

The invention relates to the technical field of energy storage systems, and provides an energy storage converter of an energy storage system, the energy storage system and electric equipment. The hyperbaric cabin is located at the position, close to the front panel, of the energy storage converter box; the low-pressure cabin is located at the position, close to the back plate, of the energy storage converter box, the low-pressure cabin comprises a low-pressure cabin upper-layer space and a low-pressure cabin lower-layer space, the upper-layer space comprises a plurality of functional plates, and the lower-layer space comprises a radiator, a plurality of inductors and a capacitor plate. The capacitor plate sinks into the lower-layer space of the low-pressure cabin, so that the layout of the energy storage converter of the energy storage system is more reasonable, and the separation of the high-pressure cabin and the low-pressure cabin is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a power conversion system (PCS) of an energy storage system, an energy storage system, and an electrical equipment. Background Art

[0002] The power conversion system (PCS) of an energy storage system realizes the bidirectional conversion between the DC power of a battery and the AC power of a power grid through a DC / AC bidirectional converter, and is used to support the switching between grid-connected / off-grid modes, so as to meet various requirements such as power grid frequency modulation, voltage regulation, and energy scheduling.

[0003] In the related art, due to the size limitation of the energy storage system and the fact that the battery cells occupy most of the space of the energy storage system, the size of the power conversion system (PCS) is very small, resulting in a very cramped layout of the internal devices of the power conversion system (PCS), and it is difficult to form a reasonable layout of the internal devices of the power conversion system (PCS). Summary of the Invention

[0004] Based on this, in view of the problems in the above background art, it is necessary to provide a power conversion system (PCS) of an energy storage system, an energy storage system, and an electrical equipment, which can at least sink the capacitor board into the lower space of the low-voltage compartment, not only making the layout of the power conversion system (PCS) of the energy storage system more reasonable, but also ensuring the separation of the high-voltage and low-voltage compartments.

[0005] In order to solve the above technical problems and other problems, according to some embodiments, a first aspect of the present application provides a power conversion system (PCS) of an energy storage system, including:

[0006] A box body;

[0007] A high-voltage compartment, located inside the box body of the power conversion system (PCS) close to the front panel of the box body;

[0008] A low-voltage compartment, located inside the box body of the power conversion system (PCS) close to the back panel of the box body. The low-voltage compartment includes an adjacent upper low-voltage compartment space and a lower low-voltage compartment space. A variety of functional boards are arranged in the upper low-voltage compartment space, and a radiator, a plurality of inductors, and a capacitor board are arranged in the lower low-voltage compartment space.

[0009] In some of these embodiments, the high-voltage compartment includes an adjacent upper high-voltage compartment space and a lower high-voltage compartment space. A variety of high-voltage devices are arranged in the upper high-voltage compartment space. The lower high-voltage compartment space is communicated with the lower low-voltage compartment space. A plurality of first ventilation holes are arranged at positions corresponding to the lower output compartment space on the front panel of the box body, and a plurality of second ventilation holes are arranged at positions corresponding to the lower power conversion control compartment space on the back panel of the box body. The plurality of first ventilation holes and the plurality of second ventilation holes are used for dissipating heat from the lower high-voltage compartment space and the lower low-voltage compartment space.

[0010] In some of these embodiments, the interconnected lower space of the high-pressure compartment and the lower space of the low-pressure compartment form an external air duct, and a first cooling fan group is provided in the lower space of the high-pressure compartment.

[0011] In some of these embodiments, a plurality of inductors and capacitor plates are arranged side by side at a first position close to the backplane, and the radiator is located between the first cooling fan and the first position.

[0012] In some of these embodiments, the plurality of inductors include a first inductor group and a second inductor group. The capacitor plates are arranged on a tray between the first inductor group and the second inductor group, and the plurality of inductors in the first inductor group and the second inductor group are arranged at intervals.

[0013] In some of these embodiments, the tray includes a wind guiding opening, and the wind guiding end of the wind guiding opening is connected to the radiator. The width of the wind guiding end of the wind guiding opening is greater than the width of the tray.

[0014] In some of these embodiments, the plurality of inductors are arranged obliquely at a first angle, and the first angle is the included angle between the width direction of the base of each inductor and the width direction of the box body.

[0015] In some of these embodiments, the upper space of the low-pressure compartment includes adjacent first and second sub-spaces. The various functional boards include a power board, a control board, an auxiliary power board, a fan auxiliary power board, an AC noise filter, a DC bus unit, a bus bar, and an AC output board;

[0016] Among them, the control board, the fan auxiliary power board, and the auxiliary power board are located in the first sub-space.

[0017] In some of these embodiments, the power board, the AC noise filter, the DC bus unit, the bus bar, and the AC output board are located in the second sub-space.

[0018] In some of these embodiments, the auxiliary power board is located above the fan auxiliary power board, the DC bus unit is located above the power board, and the AC noise filter and the control board are located above the DC bus unit.

[0019] In some of these embodiments, the energy storage converter further includes a second cooling fan group;

[0020] Among them, the second cooling fan group is located at a position on the backplane corresponding to the first sub-space, and is used to cool the control board and the auxiliary power board in the first sub-space.

[0021] In some of these embodiments, the energy storage converter further includes a third cooling fan group;

[0022] Among them, the third cooling fan group is located at a position on the backplane corresponding to the second sub-space, and is used to cool the power board, the AC noise filter, the DC bus unit, the bus bar, and the AC output board in the second sub-space.

[0023] In some of these embodiments, a third ventilation hole corresponding to the second cooling fan group is formed on the front panel of the cabinet, and a first internal cooling air duct is formed between the third ventilation hole and the second cooling fan group;

[0024] On the front panel of the cabinet, there is also formed a fourth ventilation hole including a corresponding one to the third cooling fan group, and a second internal cooling air duct is formed between the fourth ventilation hole and the third cooling fan group.

[0025] A second aspect of the present application provides an energy storage system, including: a battery pack; a management subsystem; a thermal management subsystem; a power conversion inverter of the energy storage system in any of the above embodiments.

[0026] A third aspect of the present application provides an electrical equipment, including a power conversion inverter of the energy storage system in any of the above embodiments.

[0027] In the power conversion inverter, the energy storage system, and the electrical equipment of the energy storage system in the above embodiments, it is at least possible to sink the capacitor plate into the lower space of the low-voltage layer, which not only makes the layout of the power conversion inverter of the energy storage system more reasonable, but also ensures the separation of the high- and low-voltage compartments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 Schematic diagram of a capacitor plate provided in an embodiment of the present application;

[0030] Figure 2 Schematic diagram of a power conversion inverter of an energy storage system provided in an embodiment of the present application;

[0031] Figure 3 Partial schematic diagram of the lower space of a power conversion inverter of an energy storage system provided in an embodiment of the present application;

[0032] Figure 4 Schematic diagram of a power conversion inverter of an existing energy storage system provided in an embodiment of the present application.

[0033] Explanation of the reference numerals:

[0034] 101, High-pressure chamber; 102, Radiator; 103, Capacitor plate; 104, First cooling fan group; 105, Second cooling fan group; 106, First inductor group; 107, Second inductor group; 108, Fan auxiliary power board; 109, Control board; 110, Third cooling fan group; 111, Auxiliary power board; 112, AC noise filter; 113, DC bus unit; 114, Busbar plate; 115, AC output board; 116, Power board; 201, Tray. Detailed implementation manner

[0035] For the convenience of understanding the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the understanding of the disclosure content of the present application is more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] In the case of using "including", "having", and "comprising" described herein, unless a clear limiting term is used, such as "only", "consisting of", etc., another component may be added. Unless otherwise mentioned, terms in the singular form may include the plural form and should not be construed as having a quantity of one.

[0038] It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

[0039] In this application, unless otherwise clearly specified and limited, terms such as "connected" and "coupled" should be understood in a broad sense. For example, it may be directly connected or indirectly connected through an intermediate medium, and may be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] As a key component of the energy storage system, the power conversion system (PCS) of the energy storage system faces challenges in design due to space constraints. The power conversion system of the energy storage system realizes the energy interaction between the battery and the power grid through DC / AC bidirectional conversion technology and has the function of seamless switching between grid-connected and off-grid modes. Since the internal space of the energy storage system is mainly occupied by battery cells, the installation space of the power conversion system of the energy storage system is significantly compressed, resulting in a highly compact layout of its internal components and making it difficult to form a reasonable layout of the internal equipment of the power conversion system.

[0041] Please refer to Figure 4 , Figure 4 As a comparative example of this application, a schematic diagram of the power conversion system of an energy storage system is provided.

[0042] As Figure 4 shown, the capacitor board 103 of the power conversion system of the existing energy storage system is arranged in the upper space of the low-voltage compartment. Since there are also multiple other functional boards arranged in the upper space of the low-voltage compartment, such as the power board 116, the control board 109, the AC output board 115, the auxiliary power supply board, the busbar board 114, the alternating current electromagnetic interference (AC EMI) filter 112, the direct current link (DCLINK) unit, etc., the space occupation is relatively cramped, resulting in that the fan auxiliary power supply board 108, which is also a low-voltage functional board, can only be arranged in the high-voltage compartment 101, leading to the incomplete separation of the high-voltage and low-voltage compartments.

[0043] Please continue to refer to Figure 4 , Figure 4 In the figure, the arrow shows the layout change method of the power conversion system of an energy storage system in the embodiment of this application. After sinking the capacitor board 103 between the first inductor group 106 and the second inductor group 107, the vacated part can be used to place the fan auxiliary power supply board 108. In this way, the complete isolation of the high-voltage and low-voltage compartments is ensured.

[0044] Please continue to refer to Figure 1 and Figure 4 , because the capacitors on the capacitor board 103 are large and densely arranged, the cooling air cannot flow through the capacitor board 103. Therefore, when cooling the upper space of the low-voltage compartment in the power conversion system of the related energy storage system, only some of the cooling fans corresponding to the position of the capacitor board 103 can be moved upward. After some of the cooling fans are moved upward, only the control board 109 and the auxiliary power supply board located above the capacitor board 103 can be air-cooled, and it is difficult to effectively cool the capacitor board 103 and other functional boards in the low-voltage compartment blocked by the capacitor board 103, resulting in the temperature of the capacitor board 103 and other functional boards in the low-voltage compartment that cannot be air-cooled blocked by the capacitor board 103 being extremely likely to be abnormal.

[0045] Meanwhile, due to the large size of the capacitor and the size limitation of the energy storage converter in the energy storage system, the space left for the capacitor plate 103 is small, which also causes certain difficulties in the selection of capacitors in the capacitor plate 103. In the energy storage converter of the related energy storage system, when staff selects a capacitor, they can only choose a capacitor with a lower height and a smaller size. However, capacitors with a lower height and a smaller size usually have a higher procurement price. Thus, the cost of the energy storage converter in the energy storage system also increases accordingly.

[0046] This application proposes an energy storage converter for an energy storage system. Please refer to Figures 2 - 3 the energy storage converter of the energy storage system, which includes: a box body, a high-voltage compartment 101, and a low-voltage compartment.

[0047] Among them, the high-voltage compartment 101 is located inside the box body of the energy storage converter, near the front panel of the box body.

[0048] Exemplarily, the high-voltage cabin may include high-voltage components on the DC side, high-voltage components on the AC side, a reactive power compensation board, a DC lightning protection and fuse protection board, a high-voltage switch and circuit breaker assembly, power semiconductor devices, etc. Among them, the high-voltage components on the DC side include a DC bus, a DC support capacitor, a DC filter inductor, etc. The DC bus can use a low-resistance copper bar or aluminum bar, with multiple layers of insulating layers (such as epoxy resin coating) superimposed, for connecting the battery cluster and the energy storage converter, and can carry a DC voltage of 1000V - 1500V. In a three-level topology, it is necessary to achieve intermediate voltage balance control. The DC support capacitor can be a thin-film capacitor (which can improve the high-ripple current tolerance) or an electrolytic capacitor (suitable for low-cost solutions), which can suppress the voltage fluctuation on the DC side, absorb high-frequency harmonics, and provide transient current buffering at the moment when the Insulate-Gate Bipolar Transistor (IGBT) switches. The DC filter inductor can be wound with a FeSiAl magnetic core, and the inductance value of the DC filter inductor is adjusted according to the power demand. The high-voltage components on the AC side include an inverter power unit, a step-up transformer, etc. The inverter power unit can be composed of a two-level, three-level or multi-level topology structure. The step-up transformer can use a power frequency transformer, a high-frequency transformer, etc., which can boost the voltage of the low-voltage alternating current output by the energy storage converter to match the grid connection requirements. The power semiconductor device can be an IGBT module or a MOSFET module, etc. The IGBT module can be composed of an IGBT chip, a drive circuit, a heat dissipation substrate, etc., and can adopt a multi-level packaging structure. The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) module has a breakdown voltage rating of over 1700V, supports a higher switching frequency (with 30% lower losses than the IGBT), and is more suitable for the high-frequency trend of the energy storage system. The reactive power compensation board is used to dynamically adjust the reactive power and optimize the power factor on the grid side, and is suitable for high-voltage dynamic reactive power compensation and improving the power transmission efficiency. The DC lightning protection and fuse protection board is used to prevent damage to the internal circuit of the high-voltage cabin caused by overvoltage or short circuit. The high-voltage switch and circuit breaker assembly includes an AC circuit breaker (such as U / V / W phase circuit breakers) and a DC disconnector, etc., to achieve the on-off control and fault isolation of the high-voltage circuit.

[0049] As an example, with multiple layers of insulating layers (such as epoxy resin coating) superimposed, the DC voltage that can be carried can be 1000V, 1300V, 1500V, etc.

[0050] As an example, the low-voltage compartment is located inside the box body of the energy storage converter near the back panel of the box body. The low-voltage compartment includes an adjacent upper space and a lower space of the low-voltage compartment. A variety of functional boards are arranged in the upper space of the low-voltage compartment, and a radiator 102, a plurality of inductors and capacitor boards 103 are arranged in the lower space of the low-voltage compartment.

[0051] As an example, sinking the capacitor board 103 into the lower space of the low-voltage compartment makes it more convenient for the staff to layout the components in the energy storage converter of the energy storage system. The fan auxiliary power board 108 can also be arranged in the low-voltage compartment to form a completely isolated component layout for the high- and low-voltage compartments.

[0052] As an example, sinking the capacitor board 103 into the lower space of the low-voltage compartment also makes it more convenient to cool the capacitor board 103. At the same time, it is also more convenient to form an air-cooling channel in the upper space of the low-voltage compartment, improving the cooling capacity of other functional boards in the upper space of the low-voltage compartment.

[0053] As an example, since the lower space of the low-voltage compartment can provide a larger height and width space for the capacitor board 103, it is easier for the staff to select the capacitors in the capacitor board 103. Capacitors with larger sizes and heights can be used to form the capacitor board 103. Capacitors with larger sizes and heights usually have lower procurement prices. In this way, the manufacturing cost of the energy storage converter is also reduced accordingly.

[0054] For details, please refer to Figure 2 The variety of functional boards include a power board 116, a control board 109, an auxiliary power board 111, a fan auxiliary power board 108, an AC noise filter 112, a DC bus unit 113, a bus bar 114, and an AC output board 115.

[0055] As an example, please continue to refer to Figure 2, the power board 116, as the core power conversion unit of the energy storage converter, is equipped with IGBT modules and drive circuits, and is used to achieve bidirectional energy conversion between DC and AC. It can control the switching actions of IGBTs through PWM (Pulsewidth Modulation) technology to complete the inversion / rectification process of the DC bus voltage and the grid AC power; the DC bus unit 113 is the intermediate link connecting the energy storage battery and the energy storage converter. The DC bus unit 113 can smooth the DC voltage fluctuations and suppress the high-frequency ripples on the battery side through a large-capacity capacitor bank (such as electrolytic capacitors or thin-film capacitors); the control board 109 is the control center of the energy storage converter. The control board 109 includes an integrated digital signal processing chip or a field programmable gate array (Field Programmable Gate Array, FPGA) chip, etc., and is used to execute functions such as power algorithms, communication protocols, and safety protection (overvoltage / overcurrent detection). The control board 109 can also communicate with the device management system (Building Management System, BMS) through the Controller Area Network (CAN) bus to obtain the battery status, receive electromagnetic compatibility (Electro magnetic Susceptibility, EMS) instructions to adjust the charge and discharge strategy, and real-time feedback the operation data; the AC noise filter (Electromagnetic Interference, EMI) 112 is mainly composed of a common-mode inductor and an X / Y capacitor filter, and is used to suppress the high-frequency conducted interference on the grid side. Among them, the X capacitor is connected across the phase line and the neutral line to filter out differential-mode noise, and the Y capacitor is connected between the phase line / neutral line and the ground to eliminate common-mode noise; the auxiliary power board is used to convert the main DC bus or AC input into multiple low-voltage DC power supplies to supply power to devices such as the control board 109 and sensors; the fan auxiliary power board 108 is specifically designed to provide drive power and speed control for the cooling fan, and can dynamically adjust the wind speed according to the IGBT temperature and system load to optimize the heat dissipation efficiency; the AC output board 115 includes an AC circuit breaker, a filter reactor, a voltage / current sampling circuit, etc., and is used for power output during grid connection or off-grid; the busbar board 114 is used to achieve current sharing of multiple power modules in a parallel PCS. The busbar board 114 can reduce the circulating current loss through a low-inductance busbar, is used to connect the battery cluster on the DC side, and supports multi-branch parallel expansion.

[0056] Specifically, please refer to Figure 2, the high-pressure chamber 101 includes an adjacent upper space of the high-pressure chamber 101 and a lower space of the high-pressure chamber 101. A variety of high-pressure devices are provided in the upper space of the high-pressure chamber 101. The lower space of the high-pressure chamber 101 is communicated with the lower space of the low-pressure chamber. A plurality of first ventilation holes are provided at the position corresponding to the lower space of the output chamber on the front panel of the box body, and a plurality of second ventilation holes are provided at the position corresponding to the lower space of the power conversion control chamber on the back panel of the box body. The plurality of first ventilation holes and the plurality of second ventilation holes are used to dissipate heat from the lower space of the high-pressure chamber 101 and the lower space of the low-pressure chamber.

[0057] As an example, please continue to refer to Figure 2 , the interconnected lower space of the high-pressure chamber 101 and the lower space of the low-pressure chamber form an external air duct, and a first cooling fan group 104 is provided in the lower space of the high-pressure chamber 101.

[0058] As an example, please continue to refer to Figure 2 , in this application, the capacitor plate 103 is arranged in the external air duct. Since the external air duct is directly connected to the external air, there are no other heating elements in front of the capacitor plate 103 except the radiator 102. Therefore, arranging the capacitor plate 103 in the external air duct is more convenient for dissipating heat from the capacitor plate 103.

[0059] Here, it should be noted that a variety of power devices such as IGBT and MOSFET may be provided on the power board 116, and a large amount of heat will be generated during the electric energy conversion process. Therefore, in this application, the power board 116 is arranged on the radiator 102, and the radiator 102 is used to strengthen the heat dissipation of the power board 116, and the radiator 102 is arranged in the lower air duct to directly contact the external cooling air, ensuring the cooling efficiency of the radiator 102 and further improving the heat dissipation effect of the radiator 102 on the power board 116.

[0060] Among them, the radiator 102 can adopt a fin structure to increase the heat dissipation area, and optimize the heat dissipation performance by adjusting parameters such as the height, thickness, and width of the fins. Moreover, the first cooling fan group 104 can cooperate with the radiator 102 to form forced convection to achieve uniform temperature distribution. The radiator 102 can be made of heat-conducting metals such as aluminum or copper.

[0061] Specifically, please refer to Figure 2 , a plurality of inductors and capacitor plates 103 are arranged side by side at a first position close to the back panel, and the radiator 102 is located between the first cooling fan and the first position.

[0062] Specifically, please continue to refer to Figure 2 , a plurality of inductors form a first inductor group 106 and a second inductor group 107. The capacitor plate 103 is arranged on a tray 201 between the first inductor group 106 and the second inductor group 107, and the plurality of inductors in the first inductor group 106 and the second inductor group 107 are arranged at intervals.

[0063] Exemplarily, please refer to Figure 3 , the tray 201 includes an air guiding opening, and the air guiding end of the air guiding opening is connected to the radiator 102, and the width of the air guiding end of the air guiding opening is greater than the width of the tray 201.

[0064] Please continue to refer to Figure 3 , Figure 3 The arrow in

[0065] Here, since the capacitors on the capacitor plate 103 are densely arranged, it is more difficult to dissipate heat from the capacitor plate 103. Also, although placing the capacitor plate 103 on the tray 201 makes it more convenient to install the capacitor plate 103, since the ordinary tray does not have an air guiding opening and there is no flow of cooling air at the connection point between each capacitor and the capacitor plate 103, the connection point between each capacitor and the capacitor plate 103 is more likely to have a temperature anomaly.

[0066] Meanwhile, since the capacitor plate 103 is arranged in the external air duct and the cooling air of the external air duct directly flows in from the outside of the energy storage converter, dust is likely to accumulate on the capacitor plate 103 in the tray 201. The dust accumulated on the capacitor plate 103 may form a conductive path in a humid environment, resulting in a short circuit between adjacent lines, causing abnormal discharge or component burnout, and may also cause signal transmission distortion or circuit intermittency and other faults.

[0067] Therefore, in this application, an air guiding opening is provided on the tray 201, and the air guiding opening can introduce the cooling air of the external air duct to cool the connection point between each capacitor located in the tray 201 and the capacitor plate 103.

[0068] Meanwhile, in this application, by setting the width of the air guiding end of the air guiding opening to be greater than the width of the tray 201, the wind speed of the cooling air entering the tray 201 is increased, and the higher wind speed can carry away the dust accumulated on the capacitor plate 103, avoiding the problems of short circuit between adjacent lines, signal transmission distortion or circuit intermittency faults that may occur on the capacitor plate 103 in a humid environment.

[0069] In a comparative embodiment, the problem of dust accumulation on the capacitor plate 103 can be avoided by injection molding in the tray 201.

[0070] However, the method of injection molding in the tray 201 will cause the capacitor plate 103 to be unable to be disassembled and repaired. The method adopted in this application of setting an air guiding opening on the tray 201 not only avoids dust accumulation on the capacitor plate 103, but also makes it more convenient for the staff to disassemble and repair the capacitor plate 103.

[0071] In some of the embodiments, a plurality of inductors are arranged obliquely at a first angle.

[0072] Among them, the first angle is the included angle between the width direction of the base of each inductor and the width direction of the box body.

[0073] Among them, the first angle can be 10° - 30°.

[0074] As an example, the first angle can be 10°, 15°, 20°, 25°, 30°, etc.

[0075] Here, it should be noted that the inductors arranged in a traditional parallel manner will form a laminar flow resistance, resulting in the airflow adhering to the wall and reducing the heat transfer efficiency of multiple inductors. After the multiple inductors in this application are arranged obliquely at a first angle of 10° - 30°, the inductor array composed of multiple inductors can form a stepped flow guiding structure, forcing the airflow to generate turbulence (the Reynolds number is increased by about 40%), enhancing the convective heat transfer coefficient, and moreover, the inductor array formed by the multiple inductors arranged obliquely can avoid the problem that the inductor downstream of the cooling air is in the wind shadow area of the inductor upstream and cannot be effectively cooled, making the wind speed distribution on the surface of each inductor more uniform.

[0076] Optionally, multiple inductors can also be arranged in a staggered and inclined manner. The inductor array arranged in a staggered and inclined manner will generate a vortex airflow, quickly taking away the heat of adjacent inductors.

[0077] Among them, when multiple inductors cannot be arranged in an inclined or staggered and inclined manner, the long axis of the inductors arranged in parallel should be parallel to the airflow direction of the cooling air to reduce the air flow resistance and increase the flow rate.

[0078] Optionally, a temperature detection device can also be arranged near multiple inductors, and the temperature detection device is respectively connected to the first cooling fan group and the control board 109. The control board 109 can dynamically adjust the fan speed of the first cooling fan group according to the real-time temperature of the inductor.

[0079] Please refer to Figure 2 , in some of the embodiments, the upper space of the low-pressure cabin includes a first sub-space and a second sub-space, and the multiple functional boards include a power board 116, a control board 109, an auxiliary power board 111, a fan auxiliary power board 108, an AC noise filter 112, a DC bus unit 113, a bus bar 114, and an AC output board 115.

[0080] Among them, the control board 109, the fan auxiliary power board 108, and the auxiliary power board 111 are located in the first sub-space.

[0081] Please continue to refer to Figure 2 , in some of the embodiments, the power board 116, the fan auxiliary power board 108, the AC noise filter 112, the DC bus unit 113, the bus bar 114, and the AC output board 115 are located in the second sub-space.

[0082] Please continue to refer to Figure 2 , in some embodiments, the auxiliary power board 111 is located above the fan auxiliary power board 108, the DC bus unit 113 is located above the power board 116, and the AC noise filter and the control board are located above the DC bus unit 113.

[0083] In this way, by setting the positions of multiple functional boards, the positions of the multiple functional boards in the energy storage converter are made more reasonable, which is more convenient for the connection and heat dissipation between the multiple functional boards.

[0084] Please continue to refer to Figure 2 , the energy storage converter further includes a second cooling fan group 105.

[0085] Among them, the second cooling fan group 105 is located at a position on the backplane corresponding to the first subspace, and is used to cool the control board 109, the fan auxiliary power board 108, and the auxiliary power board 111 in the first subspace.

[0086] Please continue to refer to Figure 2 , and further includes a third cooling fan group 110.

[0087] Among them, the third cooling fan group 110 is located at a position on the backplane corresponding to the second subspace, and is used to cool the AC noise filter 112, the DC bus unit 113, the busbar 114, and the AC output board 115 in the second subspace.

[0088] Here, it should be noted that since the DC bus unit 113 is relatively wide, a part of the DC bus unit 113 is located in the first subspace, and the part of the DC bus unit 113 located in the first subspace is cooled by the second cooling fan group 105.

[0089] Specifically, a third ventilation hole corresponding to the second cooling fan group is formed on the front panel of the box body, and a first internal cooling air duct is formed between the third ventilation hole and the second cooling fan group; a fourth ventilation hole corresponding to the third cooling fan group is further formed on the front panel of the box body, and a second internal cooling air duct is formed between the fourth ventilation hole and the third cooling fan group.

[0090] In this way, the effective cooling of multiple functional boards in the energy storage converter is ensured.

[0091] As an example, please continue to refer to Figure 2 , since the air resistance of the functional boards in the first internal cooling air duct is lower than that of the functional boards in the second cooling air duct, the number of the second cooling fan group can be less than the number of the third cooling fan group.

[0092] Optionally, the energy storage inverter further includes an LC filtering module, which includes a plurality of filtering capacitors and a plurality of filtering inductors. Among them, the filtering inductors and filtering capacitors can filter out the double-frequency current and ripple fluctuations of the battery, and the filtering inductors and filtering capacitors are devices with low failure rate and high service life and are not prone to failure. However, the mass of the filtering inductor is relatively large, and the installation distance between multiple filtering inductors should not be too close to each other.

[0093] In one possible implementation, one side of the LC filtering module is connected to the AC / DC power conversion module, and the other side is connected to the battery high-voltage box.

[0094] Optionally, on the front panel of the cabinet, there are provided the positive pole of the AC interface of the power conversion system (PCS), the negative pole of the AC interface of the PCS, the 15V low-voltage test terminal, the positive pole of the battery high-voltage box, the negative pole of the battery high-voltage box, the data transmission network port, the secondary control cable interface, the communication indicator light, the bypass contactor on / off switch, the fiber optic communication interface, the high-voltage test terminal, and so on.

[0095] Among them, the positive electrode and negative electrode of the PCS AC interface are respectively connected to the positive and negative of the bypass contactor inside; externally, they are used to connect in series with the positive electrode and negative electrode of the PCS AC interface of another high-voltage cascaded energy storage converter device; the positive electrode and negative electrode of the PCS AC interface are used to achieve the access of medium and high voltage by connecting the single voltages of the AC-DC power conversion module in series; the low-voltage 15V test terminal is connected to the PMC board. Before the high voltage of the device is connected, the board is powered on by an external device, and the device status on the board can be observed and read; under low-voltage conditions, the PMC board is powered on to test and read the working performance of the module; the high-voltage test terminal is connected to the energy storage capacitor bank. Before the device is powered on, the DC energy storage capacitor bank can be powered by an external voltage source, and the AC-DC power conversion module can be powered on through the high-voltage test terminal to test the module performance; the on-off switch of the bypass contactor serves as the operation port of the bypass contactor, which is used to realize the self-bypass function of the module and to automatically disconnect the bypass in case of bypass failure. After the module is repaired, manual reset is required; the optical fiber communication interface belongs to the interface of the PMC board. After connecting the optical fiber, the PMC signal is uploaded to the background of the control cabinet through the optical signal, or the background control instruction is sent to the PMC board; the energy storage batteries on the battery cluster are connected in series and then connected to the positive electrode and negative electrode of the battery high-voltage box; the data transmission network port can upload the data monitored by the high-voltage box to the background control cabinet through the 485 network cable for remote control of the device. The voltage, current, temperature and other parameters of the energy storage system are monitored by the battery high-voltage box and these information are transmitted to the control system. By monitoring these parameters, abnormal situations in the system can be detected in time and corresponding measures can be taken for treatment; the secondary control cable interface is connected to the energy storage battery. When abnormal current and voltage situations occur in the system, the circuit can be cut off in time to protect the safety of the energy storage system and other electrical equipment. The communication indicator light is electrically connected to the battery high-voltage box and is used to display the device status information monitored by the battery high-voltage box to observe the operation status of the device. Generally, red indicates a fault and green indicates normal operation.

[0096] Specifically, the box body may include a structural framework, a front panel, a right side panel, a left side panel, a rear ventilation panel, a top cover plate, etc. The structural framework can be welded by standard profiles and is used to support internal components to ensure the structural strength of the device. Lifting interfaces are designed on the framework, and the lifting interfaces include lifting mechanisms. The framework, front panel, right side panel, left side panel, rear ventilation panel and top cover plate are all made of metal materials to form the equipment protection shell.

[0097] Here, it should be noted that the energy storage converter proposed in this application is applied to an energy storage system. In the energy storage system, there is also a battery pack, a battery management system for managing the battery pack, a fire protection system, and so on.

[0098] As an example, the battery pack is placed in the battery room of the energy storage system, and the placement location and quantity of the battery pack can be set according to actual requirements. The battery pack can store the electric energy of the power grid during the low electricity consumption period and supply power to external electrical equipment during the high electricity consumption period, so as to achieve peak shaving and valley filling of electric energy and meet the power supply requirements in seasonal regions. The energy storage inverter is placed in the equipment room. The energy storage inverter is electrically connected to the battery pack and is used to adjust the output voltage, frequency, phase number, and other electrical parameters when the battery pack outputs electric energy to the outside, so as to ensure the power supply of the battery pack to external electrical equipment; the battery management system is used to manage the battery pack. Specifically, the battery management system can include an electric cabinet, which is placed in the equipment room and is electrically connected to the battery pack to manage the charging and discharging process of the battery pack, such as monitoring the charging and discharging voltage of the battery pack, etc.; the battery management system can also include temperature sensors and the like arranged on the battery pack to monitor the temperature of the battery pack and ensure the safe and reliable operation of the battery pack; the fire protection system is used to take corresponding fire extinguishing measures when a fire is detected. It can be understood that the specific installation location of the fire protection system can be determined according to actual needs. To ensure the safe operation of the micro energy storage system, the fire protection system can also be installed in the battery room, or the fire protection system can be installed in both the equipment room and the battery room.

[0099] As an example, the fire protection system can include devices such as temperature sensors, smoke sensors, automatic fire extinguishers, and controllers. The controller is respectively connected to the temperature sensor, the smoke sensor, and the automatic fire extinguisher, so as to be able to judge whether a fire has occurred according to the temperature sensed by the temperature sensor and the smoke sensed by the smoke sensor, and when it is judged that a fire has occurred, control the automatic fire extinguisher to automatically spray the fire extinguishing agent to achieve fire extinguishing. The partition between the battery room and the equipment room can be made of fireproof materials. When a fire occurs in the battery room or the equipment room, it can effectively block the spread of the fire and confine the fire within the battery room or the equipment room, so as to effectively reduce equipment losses and reduce the fire risk level, and win precious time for rescue.

[0100] Optionally, the energy storage system can further include a monitoring system. The monitoring system can include at least one of an audible and visual alarm, a gas release indicator light, an exhaust mechanism, and a pressure relief mechanism. The audible and visual alarm can be set outside the energy storage system. The audible and visual alarm can emit warning signals in the form of sound and / or light when an emergency such as a fire occurs in the energy storage system to remind the staff to handle it in time. The gas release indicator light can be set outside the energy storage system. A certain amount of hydrogen is generated during the charging and discharging process of the battery pack. When the hydrogen concentration in the energy storage system reaches a certain level, the gas release indicator light will emit warning signals such as sound and / or light to remind the staff to perform hydrogen discharge and gas release operations on the energy storage system, thereby ensuring the safety of the energy storage system during operation. The exhaust mechanism can be used to perform hydrogen discharge and gas release operations on the energy storage system. The exhaust mechanism can include an exhaust fan, and when hydrogen discharge and gas release operations are required, the exhaust fan is opened manually or automatically.

[0101] The energy storage converter of the above energy storage system sinks the capacitor plate into the lower space of the low-voltage cabin, which not only makes the layout of the energy storage converter of the energy storage system more reasonable, but also ensures the separation of the high- and low-voltage cabins.

[0102] Moreover, sinking the capacitor plate into the lower space of the low-voltage cabin also makes it more convenient to select the capacitor elements in the capacitor plate.

[0103] In an exemplary embodiment, an energy storage system is provided, including: a battery pack, a management subsystem, a thermal management subsystem, and the energy storage converter of the energy storage system in any of the above embodiments.

[0104] In an exemplary embodiment, an electrical device is provided, including the energy storage converter of the energy storage system in any of the above embodiments.

[0105] Please note that the above embodiments are for illustrative purposes only and do not imply any limitation to this application.

[0106] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0107] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0108] The above embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. An energy storage converter for an energy storage system, characterized in that, Comprising: Cabinet; High-voltage compartment, located in the cabinet of the energy storage converter near the front panel of the cabinet; Low-voltage compartment, located in the cabinet of the energy storage converter near the back panel of the cabinet. The low-voltage compartment includes an adjacent upper low-voltage compartment space and a lower low-voltage compartment space. Multiple functional boards are arranged in the upper low-voltage compartment space, and a radiator, multiple inductors and capacitor boards are arranged in the lower low-voltage compartment space.

2. The energy storage converter of the energy storage system according to claim 1, characterized in that, The high-voltage compartment includes an adjacent upper high-voltage compartment space and a lower high-voltage compartment space. Multiple high-voltage devices are arranged in the upper high-voltage compartment space. The lower high-voltage compartment space is communicated with the lower low-voltage compartment space. Multiple first ventilation holes are arranged at the position of the front panel of the cabinet corresponding to the lower output compartment space, and multiple second ventilation holes are arranged at the position of the back panel of the cabinet corresponding to the lower power conversion control compartment space. The multiple first ventilation holes and the multiple second ventilation holes are used for dissipating heat from the lower high-voltage compartment space and the lower low-voltage compartment space.

3. The energy storage converter of the energy storage system according to claim 2, characterized in that, The mutually communicated lower high-voltage compartment space and the lower low-voltage compartment space form an external air duct, and a first cooling fan group is arranged in the lower high-voltage compartment space.

4. The energy storage converter of the energy storage system according to claim 3, characterized in that, The multiple inductors and the capacitor boards are arranged side by side at a first position close to the back panel, and the radiator is located between the first cooling fan and the first position.

5. The energy storage converter of the energy storage system according to claim 2, characterized in that, The multiple inductors include a first inductor group and a second inductor group. The capacitor boards are arranged on a tray between the first inductor group and the second inductor group, and the multiple inductors in the first inductor group and the second inductor group are arranged at intervals.

6. The energy storage converter of the energy storage system according to claim 5, characterized in that, The tray includes a wind guiding opening, and the wind guiding end of the wind guiding opening is connected to the radiator. The width of the wind guiding end of the wind guiding opening is greater than the width of the tray.

7. The energy storage converter of the energy storage system according to claim 3, characterized in that The multiple inductors are arranged at a first angle. The first angle is the included angle between the width direction of the base of each inductor and the width direction of the cabinet.

8. The energy storage converter of the energy storage system according to claim 4, characterized in that, The upper low-voltage compartment space includes an adjacent first sub-space and a second sub-space. The multiple functional boards include a power board, a control board, an auxiliary power board, a fan auxiliary power board, an AC noise filter, a DC bus unit, a busbar and an AC output board; Among them, the control board, the fan auxiliary power board and the auxiliary power board are located in the first sub-space.

9. The energy storage converter of the energy storage system according to claim 8, characterized in that, The power board, the AC noise filter, the DC bus unit, the busbar and the AC output board are located in the second sub-space.

10. The energy storage converter of the energy storage system according to claim 9, characterized in that, The auxiliary power board is located above the fan auxiliary power board, the DC bus unit is located above the power board, and the AC noise filter and the control board are located above the DC bus unit.

11. The energy storage converter of the energy storage system according to claim 10, characterized in that The energy storage converter further includes a second cooling fan group; Among them, the second cooling fan group is located at the position on the back panel corresponding to the first sub-space, and is used for cooling the control board and the auxiliary power board in the first sub-space.

12. The energy storage converter of the energy storage system according to claim 11, characterized in that, The energy storage converter further includes a third cooling fan group; Among them, the third cooling fan group is located at the position on the back panel corresponding to the second sub-space, and is used for cooling the power board, the AC noise filter, the DC bus unit, the busbar and the AC output board in the second sub-space.

13. The energy storage converter of the energy storage system according to claim 12, characterized in that, A third ventilation hole corresponding to the second cooling fan group is formed on the front panel of the box body, and a first internal cooling air duct is formed between the third ventilation hole and the second cooling fan group; A fourth ventilation hole corresponding to the third cooling fan group is further formed on the front panel of the box body, and a second internal cooling air duct is formed between the fourth ventilation hole and the third cooling fan group.

14. An energy storage system, characterized in that, Comprising: Battery pack; Management subsystem; Thermal management subsystem; The energy storage converter of the energy storage system according to any one of claims 1 to 13.

15. An electrical device, characterized in that, Comprising the energy storage system according to claim 14.

Images