Energy storage system and energy storage power station

Abstract

The utility model discloses an energy storage system and an energy storage power station, in the energy storage system, one end of energy storage equipment in an X-axis direction is provided with a liquid cooling unit, one side of the energy storage equipment in a Y-axis direction is provided with a maintenance surface, an air inlet side of the liquid cooling unit is located at the end part of the energy storage equipment, and an air outlet side of the liquid cooling unit is located at the top; the power transformation equipment comprises a current transformation device and a voltage transformation device, air enters the current transformation device and the voltage transformation device from the side portion, and air is obliquely and upwards discharged from the side portion. The air outlet side of the variable-pressure device deviates from or deviates from the variable-flow device, and the air inlet side of the variable-pressure device deviates from or deviates from the air outlet side of the variable-flow device. The energy storage power station comprises a plurality of energy storage systems arranged side by side, and the problem of equipment over-temperature and frequency reduction caused by equipment layout in the energy storage power station can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, and in particular to an energy storage system and an energy storage power station. Background Art

[0002] Existing energy storage power stations generally include energy storage equipment and substation equipment. The energy storage equipment is used to place battery modules, heat dissipation units and related distribution devices, and the substation equipment is used to place converters and transformers. The energy storage equipment and substation equipment are used together to form an energy storage system in the energy storage power station. Multiple energy storage systems are arranged and placed in the station and connected to each other and to the main control room through cables to form an energy storage power station.

[0003] At present, energy storage power stations need to provide the maximum energy storage capacity under limited station space conditions, so the smaller the distance between each device, the better. However, space needs to be reserved for equipment maintenance of energy storage equipment and substation equipment, and the equipment also needs to reserve air inlet and outlet space for heat dissipation, so the distance between equipment must meet the corresponding requirements. Among them, the more important is that the equipment needs to reserve air inlet and outlet space for heat dissipation. Because there are many devices in the energy storage power station, the hot air outlet between the energy storage equipment and substation equipment inside the energy storage system will interfere with each other, and the hot air outlet between the energy storage systems will also interfere with each other. Even due to the unreasonable setting of the air inlet and outlet positions between the equipment, the hot air outlet of one device enters the cold air inlet of another device, affecting the heat dissipation effect of the equipment. The above situation is likely to cause the "heat island effect" of the energy storage power station, and will increase the temperature rise of the equipment, causing the equipment to overheat and reduce the frequency. If the distance between the equipment is increased, the site area will increase, the cable length will increase, and the construction and operation costs of the energy storage power station will increase. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and to provide an energy storage system and an energy storage power station, which can improve the problem of equipment overheating and frequency reduction caused by equipment layout in the energy storage power station.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Technical solution 1: An energy storage system, comprising an energy storage device and a transformer device; in the energy storage device, a plurality of battery clusters are arranged along the X-axis direction, and a liquid cooling unit is provided at one end in the X-axis direction, and a maintenance surface for repairing the battery cluster is provided on one side in the Y-axis direction; the liquid cooling unit is used to dissipate heat for the battery cluster, and its air inlet side is located at the end of the energy storage device in the X-axis direction, and its air outlet side is located at the top of the energy storage device in the Z-axis direction; the transformer device is connected to the energy storage device through a cable, and it is arranged along the Y-axis direction with the energy storage device, and comprises a current conversion device and a voltage conversion device arranged along the X-axis direction; the current conversion device and the voltage conversion device both take in air from the side and discharge air obliquely upward from the side; the air outlet side of the voltage conversion device deviates from or deviates from the current conversion device, and its air inlet side deviates from or deviates from the air outlet side of the current conversion device.

[0007] Technical solution 2 based on technical solution 1: In the substation equipment, the air inlet side of the converter device is located on one side of its X-axis direction and on both sides of its Y-axis direction, and its air outlet side is located on the other side of its X-axis direction and faces the transformer device; the air inlet side and air outlet side of the transformer device are both located on both sides of its Y-axis direction, and its air inlet position is lower than its air outlet position.

[0008] Technical solution three based on technical solution two: the number of the energy storage device is one, the number of the power conversion device is one, and the power conversion device of the power conversion device and the liquid cooling unit of the energy storage device are located at the same end in the X-axis direction.

[0009] Technical solution four based on technical solution two: the number of the energy storage devices is two, the number of the power transformation device is one, and the power transformation device is suitable for providing power transformation function for the two energy storage devices at the same time; the two energy storage devices are arranged along the X-axis direction, and the ends of the two energy storage devices provided with liquid cooling units are respectively located at the two ends of the X-axis direction.

[0010] Technical Solution 5 based on Technical Solution 2: The number of the energy storage devices is two, and the number of the power transformation device is one, and the power transformation device is suitable for providing power transformation function for the two energy storage devices at the same time; the two energy storage devices are arranged along the Y-axis direction, and the liquid cooling units in the two are located at the same end in the X-axis direction, and the maintenance surfaces of the two are respectively located on both sides of the Y-axis direction.

[0011] Technical Solution 6 based on Technical Solution 2: The number of the energy storage devices is four, and the number of the power transformation devices is two, each power transformation device is suitable for providing power transformation function for two energy storage devices at the same time, and the two energy storage devices corresponding to the same power transformation device form an energy storage unit; the four energy storage devices form two energy storage units, and the two energy storage devices in each energy storage unit are arranged along the Y-axis direction, and the ends of the two energy storage units provided with liquid cooling units are located at the same end in the X-axis direction, and the maintenance surfaces of the two are respectively located on both sides of the Y-axis direction; the two energy storage units are arranged along the X-axis direction, and the liquid cooling units of the two energy storage devices in one energy storage unit are located at one end in the X-axis direction, and the liquid cooling units of the two energy storage devices in the other energy storage unit are located at the other end in the X-axis direction.

[0012] Technical solution seven based on technical solution six: the two substations are located on one side of all the energy storage devices in the Y-axis direction, the transformer devices in the two substations are arranged close to each other, and the current conversion devices are arranged away from each other; the DC cable outlet of each energy storage device is located on the side where the liquid cooling unit is provided, and is connected to the corresponding current conversion device.

[0013] In addition, the utility model also provides technical solution eight: an energy storage power station, which includes multiple energy storage systems as described in any one of technical solutions one to seven, and each energy storage system is arranged side by side.

[0014] Technical Solution 9 based on Technical Solution 8: The energy storage systems are arranged side by side along the Y-axis direction and / or the X-axis direction; between the energy storage systems with corresponding positions in the X-axis direction, the positions of the energy storage devices correspond to each other, and the positions of the substation equipment correspond to each other.

[0015] Technical Solution 10 based on Technical Solution 9: For the substation equipment in different energy storage systems with corresponding positions in the X-axis direction, their respective AC cables are connected in parallel in sequence along the X-axis direction and then connected to the power grid.

[0016] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0017] Technical solution one provides an energy storage system, which includes an energy storage device and a transformer device. The energy storage device stores electric energy through a battery cluster and is connected to the transformer device through a cable. The transformer device converts direct current into alternating current through a converter and a transformer, and then transmits it to the power grid after voltage boosting. Among them, a liquid cooling unit is provided at the end of the energy storage device, and a maintenance surface is provided on the side. The two are separated. The liquid cooling unit can take in air at the end of the energy storage device. The air inlet surface is large, and the heat exchange efficiency of the liquid cooling unit is high. It is also convenient for the inspection and maintenance of the liquid cooling unit, and the maintenance surface arranged on the side can facilitate the inspection and maintenance of the battery cluster. At the same time, the air outlet side of the liquid cooling unit is located at the top, and the hot air can be discharged from the top to avoid the hot air of the energy storage device interfering with the hot air of other equipment, and also to avoid entering the air inlet of other equipment or its own equipment.

[0018] In addition, the substation equipment and the energy storage equipment are arranged along the Y-axis direction, which can reduce the distance between the converter and the distribution part of the energy storage equipment, thereby reducing the cable length; and, in the substation equipment, the converter and the transformer both take in air from the side, and both discharge air from the side at an angle upward. This design of the air inlet and outlet positions can quickly obtain cold air, avoid hot air from accumulating at the lower part of the equipment, and avoid hot and cold air from flowing in series; at the same time, since the substation equipment is located at the side of the energy storage equipment in the Y-axis direction, and the liquid cooling unit of the energy storage equipment takes in air at the end position in the X-axis direction Therefore, the air outlet of the substation equipment will not affect the air inlet of the liquid cooling unit, and the top air outlet of the liquid cooling unit will not affect the air inlet of the substation equipment, thereby effectively reducing the hot air interference between different equipment or devices in the energy storage system. The distance between the energy storage equipment and the substation equipment in the Y-axis direction can be further reduced, making the layout of the energy storage system more compact, reducing the floor space of the energy storage system, reducing the cable length, and reducing the construction and operation costs; and the hot air outlet will not affect the cold air inlet, which can effectively improve the formation and aggravation of the "heat island effect" and reduce the temperature rise of the equipment.

[0019] In the second technical solution, the positions of the air inlet and air outlet sides of the converter device are limited, and the position of the air inlet side will not be affected by the energy storage device and the transformer device. At the same time, although the position of the air outlet side is toward the transformer device, the air inlet side of the transformer device is away from or deviates from the air outlet side of the converter device, that is to say, the air inlet of the transformer device will not be affected by the air outlet of the converter device. At the same time, limiting the air inlet and air outlet sides of the transformer device can increase the air inlet and air outlet surfaces, improve the air inlet and air outlet efficiency, and will not affect the converter device. At the same time, making its air inlet position below the air outlet position, combined with its upward inclined air outlet method, can prevent the hot air discharge of the transformer device from affecting the intake of cold air.

[0020] Technical Solutions 3 to 7 provide a variety of layout methods for energy storage systems. In these layout methods, the air inlet and outlet between the energy storage equipment and the substation equipment will not interfere with each other, and the liquid cooling unit and battery cluster can be easily inspected and maintained.

[0021] Among them, when there are four energy storage devices, these energy storage devices cooperate to form a "field"-shaped layout. This layout can enable the liquid cooling unit of each energy storage device to take in air from the end when a large number of energy storage devices are set, and the maintenance surface of each energy storage device is exposed to the outside, which is convenient for maintenance of the battery cluster; at the same time, two substations are set on the sides of the four energy storage devices in the Y-axis direction, the transformer devices in the two substations are set close to each other, and the current converter devices are set away from each other, and the outlet of the DC cable of the energy storage device is located on the side where the liquid cooling unit is set, so that the current converter device used to connect the energy storage device in each substation is closer to the corresponding two energy storage devices, thereby reducing the length of the DC cable.

[0022] Technical solution eight provides an energy storage power station, which adopts the energy storage system in the above technical solution to reduce the mutual interference between the air intake and air outlet of the equipment in the system.

[0023] In Technical Solution Nine, between each energy storage system, according to the layout of each device within the energy storage system and the layout between the energy storage systems, the equipment of different energy storage systems will not interfere with each other in terms of air intake and air outlet. The energy storage systems in the entire energy storage power station can be as close as possible. With the same capacity, the footprint is smaller and the power density is higher.

[0024] In Technical Solution 10, the AC cables are connected in sequence, and the DC cables are only used inside the energy storage system. The AC and DC parts of the energy storage power station can be separated to avoid mutual interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of an energy storage device in an embodiment of an energy storage system provided by the utility model;

[0027] Figure 2 A schematic diagram of a power conversion device in an embodiment of an energy storage system provided by the utility model;

[0028] Figure 3The layout of the embodiment of the energy storage system provided by the utility model Figure 1 ;

[0029] Figure 4 The layout of the embodiment of the energy storage system provided by the utility model Figure 2 ;

[0030] Figure 5 The layout of the embodiment of the energy storage system provided by the utility model Figure 3 ;

[0031] Figure 6 The layout of the embodiment of the energy storage system provided by the utility model Figure 4 ;

[0032] Figure 7 for Figure 6 Layout Figure 4 A three-dimensional schematic diagram of

[0033] Figure 8 This is a layout diagram of an embodiment of the energy storage power station provided by the utility model.

[0034] Description of main reference numerals:

[0035] Energy storage device 1; power transformation device 2; battery cluster 3; liquid cooling unit 4; maintenance surface 5; current conversion device 6; voltage transformation device 7; DC cable 8; AC cable 9. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0037] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0038] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0039] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0040] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0041] Example 1

[0042] The utility model embodiment 1 provides an energy storage system, referring to Figure 1 and Figure 2 The energy storage system includes an energy storage device 1 and a power transformation device 2.

[0043] Reference Figure 1 and Figure 3 In the energy storage device 1, a plurality of battery clusters 3 are arranged along the X-axis direction, and a liquid cooling unit 4 is provided at one end in the X-axis direction, and a maintenance surface 5 for inspecting the battery cluster 3 is provided on one side in the Y-axis direction; the liquid cooling unit 4 is used to dissipate heat for the battery cluster 3, and its air inlet side is located at the end of the energy storage device 1 in the X-axis direction, and its air outlet side is located at the top of the energy storage device 1 in the Z-axis direction.

[0044] The X-axis direction is the length direction of the energy storage device 1 , the Y-axis direction is the width direction of the energy storage device 1 , and the Z-axis direction is the vertical direction.

[0045] Specifically, the energy storage device 1 mainly includes a shell, a battery cluster 3, a liquid cooling unit 4 and a power distribution device. In this embodiment, the shell adopts a standard container box, which can facilitate the transportation and hoisting of the energy storage device 1. Its structure is sturdy and durable, easy to integrate and maintain, and can effectively reduce costs and improve efficiency. In the energy storage device 1, the battery cluster 3 is formed by vertically stacking a plurality of battery modules, and adjacent battery clusters 3 can be isolated by partitions to prevent the battery clusters 3 from affecting each other. There are multiple single cells inside the battery module, and these single cells are connected in series or in parallel, and necessary electrical components such as DC-DC converters are configured at the same time. The liquid cooling unit 4 uses coolant to dissipate heat and cool the battery cluster 3. Its radiator can accelerate the heat exchange between the coolant and the environment through a large surface area. The radiator uses air cooling to exchange heat. In this embodiment, its air inlet side is located at the end of the energy storage device 1, and its air outlet side is located at the top of the energy storage device 1. In this embodiment, the power distribution device is arranged below the liquid cooling unit 4, which can connect the battery cluster 3 and the transformer 2 through a DC cable 8.

[0046] In the above description of the energy storage device 1, according to the difference in the position of the maintenance surface 5 relative to the liquid cooling unit 4, the structure of the energy storage device 1 can be divided into a conventional structure and a mirror structure. Figure 1 For the conventional structure, the liquid cooling unit 4 is located at the right end of the energy storage device 1, and the maintenance surface 5 is located at the front side of the energy storage device 1. For the mirror structure, when the liquid cooling unit 4 is located at the right end of the energy storage device 1, the maintenance surface 5 maintains the back side of the energy storage device 1.

[0047] The liquid cooling unit 4 is arranged at the end of the energy storage device 1, and the end of the energy storage device 1 can be used as the air inlet surface of the liquid cooling unit 4, so the liquid cooling unit 4 can have a higher air inlet efficiency, and can also provide a larger inspection and maintenance space for the liquid cooling unit 4. At the same time, the air outlet side of the liquid cooling unit 4 is located at the top, that is, it can discharge the hot air upward, which can prevent the hot air of the liquid cooling unit 4 from interfering with other equipment.

[0048] The maintenance surface 5 of the energy storage device 1 is provided with a door panel, and the internal battery cluster 3 or other components can be conveniently inspected and maintained by opening the door panel.

[0049] Reference Figure 2 and Figure 3 The power conversion device 2 is connected to the energy storage device 1 through a cable, and is arranged along the X-axis direction with the energy storage device 1, and includes a converter 6 and a transformer 7 arranged along the X-axis direction; the converter 6 and the transformer 7 both take in air from the side and discharge air obliquely upward from the side; the outlet side of the transformer 7 deviates from or deviates from the converter 6, and its inlet side deviates from or deviates from the outlet side of the converter 6.

[0050] Among them, the above-mentioned "departure or deviation" means that the air inlet direction or the air outlet direction does not point to or deviates from the reference object. For example, for the transformer 7, its air outlet side is located on the side away from the converter 6, or its air outlet side is 90 degrees to the converter 6.

[0051] Specifically, the power conversion equipment 2 mainly includes a current conversion device 6 and a voltage conversion device 7. The current conversion device 6 is used for unidirectional or bidirectional conversion of direct current and alternating current, and the voltage conversion device 7 is used for stepping up and / or stepping down the voltage of alternating current. The main component of the current conversion device 6 is a power component, and the power component performs current conversion by turning on and off the IGBT switch module. The main component of the voltage conversion device 7 is a transformer, and a box-type transformer is used in this embodiment. The current conversion device 6 is connected to the distribution device part of the energy storage device 1 through a DC cable 8, and the voltage conversion device 7 is connected to the external power grid through an AC cable 9.

[0052] A radiator is provided in the converter 6, and the radiator adopts air cooling to dissipate heat, and is located at the top of the converter 6. Figure 2 , the air inlet side of the radiator is located on its right side, front side and rear side, and the air outlet side is located on its left side. Similarly, a radiator is also provided in the transformer 7, and the radiator adopts air cooling to dissipate heat, and its internal air duct is arranged to take in and out air at the front and rear sides of the transformer 7, and its air inlet position is located at the lower part of the transformer 7, and its air outlet position is located at the upper part of the transformer 7. With such arrangement, the hot air can be quickly discharged upward to avoid the accumulation of hot air at the lower part of the equipment, and the cold air located near the ground can be quickly inhaled. In addition, the air outlet side of the converter 6 faces the transformer 7, but the transformer 7 does not have an air inlet at its right side, so the hot air outlet of the converter 6 will not affect the transformer 7. At the same time, the air outlet side of the transformer 7 faces the front and rear sides, so it will not affect the converter 6.

[0053] The air outlet directions of the flow converter 6 and the transformer 7 are both set to be inclined upward. The inclined upward air outlet can be achieved by improving the air outlet louvers. Specifically, the blades of the air outlet louvers are set to be inclined upward, so that the hot air can be discharged obliquely upward.

[0054] In addition, in the energy storage system, the energy storage device 1 and the transformer device 2 are arranged along the Y-axis direction. Since the air inlet side of the liquid cooling unit 4 in the energy storage device 1 is arranged at the end of the X-axis direction, the air outlet of the transformer device 2 will not affect the air inlet of the energy storage device 1. At the same time, the converter 6 of the transformer device 2 and the liquid cooling unit 4 of the energy storage device 1 are located at the same end in the X-axis direction, so that the energy storage device 1 can directly lead the DC cable 8 from one end of the liquid cooling unit 4 to the converter 6, which can shorten the length of the DC cable 8 and reduce the construction cost.

[0055] It should be noted that the above description of the energy storage system does not limit the number of energy storage devices 1 and power transformation devices 2. Under different numbers, the energy storage devices 1 and power transformation devices 2 in the energy storage system must follow a certain layout.

[0056] Reference Figure 3 In this layout, there is one energy storage device 1 and one power transformer 2, and the power transformer 2 is located on one side of the energy storage device 1 in the Y-axis direction. Figure 3 In the orientation shown, the air inlet side of the energy storage device 1 is on the left side along the X-axis, and the air inlet side of the converter device 6 is on the left side along the X-axis and the front and rear sides along the Y-axis. The two are arranged side by side along the Y-axis direction, and the air inlets will not interfere with each other; at the same time, the air inlet and air outlet of the transformer device 7 are both on the front and rear sides along the Y-axis direction, and its air outlet points to the side of the energy storage device 1, so it will not affect the energy storage device 1. In addition, the air outlet side of the converter device 6 is on the right side along the X-axis direction, facing the transformer device 7, where the transformer device 7 is not provided with an air inlet, so it will not affect the air inlet of the transformer device 7.

[0057] Reference Figure 4 In this layout, there are two energy storage devices 1 and one power transformer 2. The power transformer 2 is suitable for providing power transformer function for two energy storage devices 1 at the same time. The two energy storage devices 1 are arranged along the X-axis direction, and the ends of the two energy storage devices 1 provided with liquid cooling units 4 are respectively located at the two ends of the X-axis direction. Specifically, the ends of the two energy storage devices 1 without liquid cooling units 4 are butt-jointed, and the ends of the two energy storage devices 1 with liquid cooling units 4 are facing away from each other. At this time, the two energy storage devices 1 can adopt the same structure or a combination of a conventional structure and a mirror structure. The difference lies in the different positions of the maintenance surface 5. However, since there are no other devices on the upper and lower sides of the two energy storage devices 1 along the Y-axis direction, the position of the maintenance surface 5 will not affect the inspection and maintenance of the energy storage devices 1.

[0058] Reference Figure 5 , there are two energy storage devices 1 and one power conversion device 2, and the power conversion device 2 is suitable for providing power conversion function for the two energy storage devices 1 at the same time; the two energy storage devices 1 are arranged along the Y-axis direction, and the liquid cooling units 4 in the two are located at the same end in the X-axis direction, and the maintenance surfaces 5 of the two are respectively located on both sides of the Y-axis direction. Specifically, the sides of the two energy storage devices 1 along the Y-axis direction are butted against each other, and at the same time, the ends of the two energy storage devices 1 with the liquid cooling units 4 are both located on the left side along the X-axis direction. At this time, the two energy storage devices 1 must adopt a combination of conventional structure and mirror structure to make the maintenance surfaces 5 of the two be located on the upper and lower sides along the Y-axis direction respectively.

[0059] Reference Figure 6 and Figure 7, there are four energy storage devices 1 and two power conversion devices 2. Each power conversion device 2 is adapted to provide power conversion functions for two energy storage devices 1 simultaneously. Two energy storage devices 1 corresponding to the same power conversion device 2 form an energy storage unit; the four energy storage devices 1 form two energy storage units. The two energy storage devices 1 in each energy storage unit are arranged along the Y-axis direction, and the ends of both of them provided with the liquid cooling unit 4 are located at the same end in the X-axis direction, and their maintenance surfaces 5 are respectively located on both sides in the Y-axis direction; the two energy storage units are arranged along the X-axis direction. The liquid cooling units 4 of the two energy storage devices 1 in one energy storage unit are located at one end in the X-axis direction, and the liquid cooling units 4 of the two energy storage devices 1 in the other energy storage unit are located at the other end in the X-axis direction. Specifically, two energy storage devices 1 form a combination to form an energy storage unit, and the two energy storage devices 1 in this energy storage unit are arranged in the layout mode as shown in Figure 5 . At the same time, the ends of these two energy storage units without the liquid cooling unit 4 are arranged in butt joint in a one-to-one correspondence, so as to form the layout mode as shown in Figure 6 . With such a setting, when there are four energy storage devices 1, these energy storage devices 1 cooperate to form a layout pattern in the shape of a "field". This pattern can enable the liquid cooling unit 4 of each energy storage device 1 to intake air from the end, and at the same time, the maintenance surface 5 of each energy storage device 1 is exposed on the outside, which is convenient for maintaining the battery cluster 3; both power conversion devices 2 are arranged on the side of the four energy storage devices 1 in the Y-axis direction. The voltage conversion devices 7 in the two power conversion devices 2 are arranged close to each other, while the current conversion devices 6 are arranged away from each other, so that the distance between the current conversion device 6 for connecting the energy storage device 1 in each power conversion device 2 and the corresponding two energy storage devices 1 is closer, reducing the length of the DC cable 8. Here, the so-called "the voltage conversion devices 7 are arranged close to each other and the current conversion devices 6 are arranged away from each other" means that in a pair of power conversion devices 2, these two power conversion devices 2 are arranged along the X-axis direction. The current conversion device 6 of the power conversion device 2 on the left is located on the left, the current conversion device 6 of the power conversion device 2 on the right is located on the right, and their voltage conversion devices 7 are located in the middle position.

[0060] Embodiment 2

[0061] Embodiment 2 of the present utility model provides an energy storage power station, which includes a plurality of energy storage systems in Embodiment 1, and these energy storage systems are arranged side by side.

[0062] The so-called "arranged side by side" here means that each energy storage system can be arranged side by side along the Y-axis direction and / or the X-axis direction. For example, referring to Figure 8, which shows a layout of an energy storage power station, in which three energy storage systems are arranged side by side in the X-axis direction, and three energy storage systems are arranged side by side in the Y-axis direction, forming a nine-square grid energy storage power station layout. Moreover, between the energy storage systems with corresponding positions in the X-axis direction, the positions of the energy storage devices 1 correspond to each other, and the positions of the transformer devices 2 correspond to each other. Figure 8 In the energy storage power station shown in the figure, the energy storage system adopts Figure 6 and Figure 7 In the layout shown, the energy storage device 1 is located on one side of the Y-axis direction, and the transformer device 2 is located on the other side of the Y-axis direction. Since the energy storage device 1 takes in air at the end of the X-axis direction, the air inlet sides of the energy storage devices 1 of adjacent energy storage systems are opposite in the X-axis direction, and the air inlet of the energy storage device 1 will not be affected by the air outlet of other devices or apparatuses; in the transformer device 2, the converter device 6 takes in air on both sides of the Y-axis direction and one side of the X-axis direction, so in the X-axis direction, the air inlet sides of the converter devices 2 of adjacent energy storage systems are also partially opposite, and the air inlet of the converter device 2 will not be affected by the air outlet of other devices or apparatuses. In the Y-axis direction, the energy storage device 2 does not discharge air in the Y-axis direction, so it will not affect the air inlet of the converter device 2.

[0063] Therefore, under this layout, the distance between different energy storage systems can be as close as possible, and only enough channels need to be left for maintenance of the energy storage systems and corresponding fire passages, which can effectively reduce the footprint of the energy storage power station.

[0064] In other embodiments, you can copy Figure 8 The layout shown enables two Figure 8 The clusters of the energy storage systems are located on the left and right sides of the X-axis direction.

[0065] Reference Figure 8 In this embodiment, the AC cables 9 of the transformer substations 2 in different energy storage systems corresponding to each other in the X-axis direction are connected in parallel in sequence along the X-axis direction and then connected to the power grid. Among them, the AC cables 9 of the two transformer substations 2 in the same energy storage system are first collected, and then the AC cables are led out along the right side of the X-axis direction, and are sequentially connected to each transformer substation 2 in the X-axis direction to form a bus of AC cables 9 in the X-axis direction, and then the buses of all AC cables in the Y-axis direction can be connected and connected to the power grid. At the same time, the DC cable 8 is only used inside the energy storage system, so that the wiring of the AC part and the DC part of the energy storage power station can be separated to avoid overlap and mutual interference between the two.

[0066] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. An energy storage system, characterized in that: It comprises an energy storage device (1) and a power transformation device (2); In the energy storage device (1), a plurality of battery clusters (3) are arranged along the X-axis direction, and a liquid cooling unit (4) is provided at one end in the X-axis direction, and a maintenance surface (5) for inspecting the battery clusters (3) is provided at one side in the Y-axis direction; the liquid cooling unit (4) is used to dissipate heat for the battery clusters (3), and its air inlet side is located at the end of the energy storage device (1) in the X-axis direction, and its air outlet side is located at the top of the energy storage device (1) in the Z-axis direction; The power conversion device (2) is connected to the energy storage device (1) via a cable, and is arranged along the Y-axis direction with the energy storage device (1), and comprises a current conversion device (6) and a voltage conversion device (7) arranged along the X-axis direction; the current conversion device (6) and the voltage conversion device (7) both take in air from the side, and discharge air obliquely upward from the side; the outlet side of the voltage conversion device (7) is away from or deviates from the current conversion device (6), and its air inlet side is away from or deviates from the outlet side of the current conversion device (6).

2. An energy storage system as claimed in claim 1, characterized in that: In the power conversion equipment (2), the air inlet side of the converter device (6) is located on one side of the X-axis direction and on both sides of the Y-axis direction, and the air outlet side is located on the other side of the X-axis direction and faces the transformer device (7); the air inlet side and the air outlet side of the transformer device (7) are both located on both sides of the Y-axis direction, and the air inlet position is lower than the air outlet position.

3. An energy storage system as claimed in claim 2, characterized in that: The number of the energy storage device (1) is one, the number of the power conversion device (2) is one, and the current conversion device (6) of the power conversion device (2) and the liquid cooling unit (4) of the energy storage device (1) are located at the same end in the X-axis direction.

4. An energy storage system as claimed in claim 2, characterized in that: The number of the energy storage devices (1) is two, and the number of the power conversion device (2) is one, and the power conversion device (2) is suitable for providing power conversion functions for the two energy storage devices (1) at the same time; the two energy storage devices (1) are arranged along the X-axis direction, and the ends of the two energy storage devices (1) provided with the liquid cooling units (4) are respectively located at the two ends of the X-axis direction.

5. An energy storage system as claimed in claim 2, characterized in that: The number of the energy storage devices (1) is two, the number of the power conversion device (2) is one, and the power conversion device (2) is suitable for providing power conversion functions for the two energy storage devices (1) at the same time; the two energy storage devices (1) are arranged along the Y-axis direction, the liquid cooling units (4) in the two are located at the same end in the X-axis direction, and the maintenance surfaces (5) of the two are respectively located on both sides of the Y-axis direction.

6. An energy storage system as claimed in claim 2, characterized in that: The number of the energy storage devices (1) is four, and the number of the power conversion devices (2) is two. Each power conversion device (2) is suitable for providing power conversion functions for two energy storage devices (1) at the same time. The two energy storage devices (1) corresponding to the same power conversion device (2) form an energy storage unit. The four energy storage devices (1) form two energy storage units. The two energy storage devices (1) in each energy storage unit are arranged along the Y-axis direction. The ends of the two energy storage devices (1) provided with the liquid cooling unit (4) are both located at the same end in the X-axis direction. The maintenance surfaces (5) of the two energy storage units are respectively located on both sides of the Y-axis direction. The two energy storage units are arranged along the X-axis direction. The liquid cooling unit (4) of the two energy storage devices (1) in one energy storage unit is located at one end in the X-axis direction, and the liquid cooling unit (4) of the two energy storage devices (1) in the other energy storage unit is located at the other end in the X-axis direction.

7. An energy storage system as claimed in claim 6, characterized in that: The two power conversion devices (2) are both located on one side of all the energy storage devices (1) in the Y-axis direction, the voltage conversion devices (7) in the two power conversion devices (2) are arranged close to each other, and the current conversion devices (6) are arranged away from each other; the outlet of the DC cable (8) of each energy storage device (1) is located on the side where the liquid cooling unit (4) is provided, and is connected to the corresponding current conversion device (6).

8. An energy storage power station, characterized in that: It comprises a plurality of energy storage systems as described in any one of claims 1 to 7, each energy storage system being arranged side by side.

9. An energy storage power station as claimed in claim 8, characterized in that: The energy storage systems are arranged side by side along the Y-axis direction and / or the X-axis direction; between the energy storage systems with corresponding positions in the X-axis direction, the positions of the energy storage devices (1) correspond to each other, and the positions of the power transformation devices (2) correspond to each other.

10. An energy storage power station as claimed in claim 9, characterized in that: The respective AC cables (9) of the transformer devices (2) in different energy storage systems corresponding to each other in the X-axis direction are sequentially connected in parallel along the X-axis direction and then connected to the power grid.

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