Energy storage device

Abstract

The utility model relates to an energy storage device, and relates to the technical field of energy storage systems. The utility model provides an energy storage device which comprises at least one battery cluster and a heat exchange unit. A liquid cooling flow channel for flowing a refrigerant is arranged in the battery cluster, and is provided with an inlet and an outlet; the heat exchange unit is provided with a liquid outlet and an air return port, the liquid outlet communicates with the inlet, the air return port communicates with the outlet, and the heat exchange unit is used for exchanging heat with the refrigerant so that the refrigerant can generate phase change. Compared with an existing energy storage device in which a plate heat exchanger and a cooling liquid loop are arranged in a liquid cooling unit, the energy storage device has the advantages that the plate heat exchanger and the cooling liquid loop are omitted, and the heat exchange unit is arranged to perform direct cooling heat exchange on the battery cluster; therefore, the problem of partial heat loss caused by secondary heat exchange between the plate heat exchanger and the battery cluster is solved, the heat exchange efficiency is improved, parts are reduced, and the cost of heat management parts is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage system technical field, specifically, relate to a kind of energy storage device. BACKGROUND

[0002] The heat management mode of lithium battery energy storage system field product is mainly air-cooled cooling and liquid-cooled cooling.The liquid-cooled cooling heat management mode of the existing lithium battery energy storage field system product has the following defects:1, the heat exchange process is influenced by the heat exchange efficiency of heat exchanger of liquid cooling unit, and part of heat loss can be generated in the heat exchange process of liquid cooling mode using the heat exchanger of liquid cooling unit to make refrigerant of refrigerant circuit and cooling liquid of cooling liquid circuit exchange heat;2, the liquid cooling unit corresponding to liquid cooling mode has more components, high cost and heavy weight;3, the cooling liquid circuit corresponding to liquid cooling mode has the risk of internal leakage in battery cluster, and internal leakage can affect the insulation of battery cluster. SUMMARY

[0003] The utility model discloses a kind of energy storage devices, which can directly cool heat exchange to battery cluster.

[0004] The embodiment of the utility model can be realized as follows:

[0005] In the first aspect, the utility model provides a kind of energy storage device, comprising:

[0006] At least one battery cluster, the battery cluster is equipped with liquid cooling channel for flowing refrigerant, the liquid cooling channel is equipped with import and export;

[0007] Heat exchange unit, the heat exchange unit is equipped with liquid outlet and return air port, the liquid outlet is communicated with the import, the return air port is communicated with the export, and the heat exchange unit is used to exchange heat with the refrigerant, so that the refrigerant generates phase change.

[0008] In optional implementation, the energy storage device further includes liquid inlet pipe assembly and return air pipe assembly, the liquid outlet is communicated with the import by the liquid inlet pipe assembly;

[0009] The return air port is communicated with the export by the return air pipe assembly.

[0010] In optional implementation, the pipe diameter of the return air pipe assembly is greater than the pipe diameter of the liquid inlet pipe assembly;

[0011] The pipe diameter of the liquid inlet pipe assembly is 4-15mm, and the pipe diameter of the return air pipe assembly is 10-30mm.

[0012] In optional implementation, the liquid inlet pipe assembly is metal pipe structure;

[0013] The return gas pipe assembly is a three-layer nylon pipe structure, the wall thickness of the return gas pipe assembly is 1-5mm, the three-layer nylon pipe structure comprises an inner wall layer, an intermediate layer and an outer wall layer, the inner wall layer and the outer wall layer are nylon material structures, the intermediate layer is a metal material structure, and the thickness ratio of the inner wall layer, the intermediate layer and the outer wall layer is 4:2:4 or 3:4:3 or 3.5:3:3.5.

[0014] In an optional embodiment, the energy storage device comprises a device body, a plurality of mounting racks and a skin, the skin is arranged around the device body, and a plurality of battery clusters are arranged on the mounting racks in sequence;

[0015] Each battery cluster is provided with a high-low voltage control system.

[0016] In an optional embodiment, the liquid inlet pipe assembly comprises a primary liquid inlet pipe, a plurality of secondary liquid inlet pipes and a plurality of tertiary liquid inlet pipes, the primary liquid inlet pipe extends along the arrangement direction of the mounting racks, and the secondary liquid inlet pipes extend along the arrangement direction of the battery clusters.

[0017] The secondary liquid inlet pipe is provided with a secondary liquid inlet end and a plurality of secondary liquid outlet ends, the primary liquid inlet pipe is connected to the liquid outlet and the secondary liquid inlet end, and the plurality of tertiary liquid inlet pipes are respectively connected to the plurality of secondary liquid outlet ends and the plurality of inlets.

[0018] In an optional embodiment, the diameter of the primary liquid inlet pipe is greater than that of the secondary liquid inlet pipe.

[0019] The tertiary liquid inlet pipe is connected to the inlet through a first quick connector.

[0020] The secondary liquid inlet pipe is provided with a first flow control valve.

[0021] In an optional embodiment, the tertiary liquid inlet pipe is provided with at least one bending section.

[0022] In an optional embodiment, the return gas pipe assembly comprises a primary return gas pipe, a plurality of secondary return gas pipes and a plurality of tertiary return gas pipes, the primary return gas pipe extends along the arrangement direction of the mounting racks, and the secondary return gas pipes extend along the arrangement direction of the battery clusters.

[0023] The secondary return gas pipe is provided with a secondary gas outlet end and a plurality of secondary gas inlet ends, the primary return gas pipe is connected to the gas return port and the secondary gas outlet end, and the plurality of tertiary return gas pipes are respectively connected to the plurality of secondary gas inlet ends and the plurality of outlets.

[0024] In an optional embodiment, the diameter of the primary return gas pipe is greater than that of the secondary return gas pipe.

[0025] The three-stage return gas pipe is connected to the outlet via a second quick connector;

[0026] The secondary return gas pipe is equipped with a second flow control valve.

[0027] The beneficial effects of the energy storage device provided in this embodiment of the present invention include:

[0028] Compared to existing energy storage devices that use plate heat exchangers and coolant circuits in liquid-cooled units, this application eliminates the plate heat exchangers and coolant circuits and solves the problem of partial heat loss caused by secondary heat exchange between the plate heat exchanger and the battery cluster by setting up a heat exchange unit for direct cooling heat exchange of the battery cluster. This improves heat exchange efficiency, reduces the number of parts, and lowers the cost of thermal management components. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a first structural schematic diagram of the energy storage device provided in this embodiment;

[0031] Figure 2 This is a schematic diagram of the battery cluster structure provided in this embodiment;

[0032] Figure 3 This is a second structural schematic diagram of the energy storage device provided in this embodiment;

[0033] Figure 4 for Figure 3 A partial schematic diagram of A in the middle;

[0034] Figure 5 for Figure 3 A partial schematic diagram of B in the diagram;

[0035] Figure 6 A schematic diagram of the first structure of the three-stage inlet pipe with a bend section provided in this embodiment;

[0036] Figure 7 This is a schematic diagram of the second structure of the three-stage inlet pipe with a bend section provided in this embodiment.

[0037] Icon: 010-energy storage device; 100-battery cluster; 110-liquid cooling plate; 120-first water nozzle; 130-second water nozzle; 200-device body; 210-mounting frame; 220-skin; 230-high and low pressure control system; 300-heat exchange unit; 400-liquid inlet pipe assembly; 410-first stage liquid inlet pipe; 420-second stage liquid inlet pipe; 421-first branch pipe; 422-first T-shaped tee joint; 430-third stage liquid inlet pipe; 431-bent section; 440-first connecting flange; 450-first flow control valve; 500-gas return pipe assembly; 510-first stage gas return pipe; 520-second stage gas return pipe; 521-second branch pipe; 522-second T-shaped tee joint; 530-third stage gas return pipe; 540-second connecting flange; 550-second flow control valve. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0040] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0042] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0043] It should be noted that the features in the embodiments of the utility model can be combined with each other in the case of no conflict.

[0044] The overall structure, working principle and technical effects of the energy storage device 010 provided by the utility model are described in detail below by means of embodiments and in combination with the drawings.

[0045] Please refer to Figure 1 The energy storage device 010 provided by the utility model is applied to a container type energy storage device.

[0046] Please refer to Figure 1 And Figure 3 The utility model includes an energy storage device 010, which comprises at least one battery cluster 100 and a heat exchange unit 300; the battery cluster 100 is provided with a liquid cooling channel for flowing refrigerant, and the liquid cooling channel is provided with an inlet and an outlet; the heat exchange unit 300 is provided with a liquid outlet and a gas return port, the liquid outlet is communicated with the inlet, the gas return port is communicated with the outlet, and the heat exchange unit 300 is used for heat exchange with the refrigerant to make the refrigerant change phase.

[0047] It can be understood that the liquid refrigerant of the heat exchange unit 300 enters the liquid cooling channel through the liquid outlet and the inlet to exchange heat with the battery cluster 100, the refrigerant after heat exchange absorbs the heat of the battery cluster 100, so that the liquid refrigerant changes phase and stores heat in the form of heat absorption and vaporization, the gaseous refrigerant flows back into the heat exchange unit 300 through the outlet and the gas return port to exchange heat, and the heat exchange unit 300 compresses and cools the gaseous refrigerant and then changes phase and condenses into liquid. Compared with the existing energy storage device 010 provided with a plate heat exchanger and a cooling liquid circuit in the liquid cooling unit, the plate heat exchanger and the cooling liquid circuit are cancelled in the present application, and the battery cluster 100 is directly cooled and exchanged by the heat exchange unit 300, so that the problem of partial heat loss caused by secondary heat exchange between the plate heat exchanger and the battery cluster 100 is solved, the heat exchange efficiency is improved, the number of parts is reduced, and the cost of heat management parts is reduced.

[0048] In the embodiment, please refer to Figure 1 The energy storage device 010 comprises a device body 200, a plurality of mounting racks 210 and a skin 220, the skin 220 is arranged around the device body 200, the plurality of mounting racks 210 are arranged on the device body 200 in sequence, and the plurality of battery clusters 100 are arranged on the mounting racks 210 in sequence. Wherein, the heat exchange unit 300 is also arranged in the device body 200.

[0049] Each battery cluster 100 is provided with a high-low voltage control system 230, and the high-low voltage control system 230 controls the high-voltage circuit and low-voltage communication signal of the battery cluster 100.

[0050] The mounting rack 210 is used for mounting, limiting and supporting the battery cluster 100 and other components.

[0051] The device body 200 is provided with the skin 220 around the device body 200, that is, the skin 220 is arranged in the front, rear, left, right, up and down directions of the device body 200. In this way, the container cabin can be sealed to prevent water vapor, dust and sundries from entering the container cabin.

[0052] In the embodiment, as shown in Figure 1 , the mounting racks 210 are arranged on the device body 200 from left to right, and the battery clusters 100 are arranged on the mounting racks 210 from top to bottom. Of course, in other embodiments, the mounting racks 210 can be arranged on the device body 200 from top to bottom, and the battery clusters 100 can be arranged on the mounting racks 210 from left to right.

[0053] In the embodiment, as shown in Figure 2 , the battery cluster 100 is used for storing electric energy, and includes an upper box body and a lower box body connected to each other. The upper box body and the lower box body form a mounting space, and a plurality of battery packs in series or in parallel are arranged in the mounting space of the battery cluster 100. The bottom of the lower box body is a liquid cooling plate 110, and the liquid cooling plate 110 is provided with a liquid cooling flow channel. The liquid cooling flow channel is provided with an inlet and an outlet.

[0054] As shown in Figure 2 , the battery cluster 100 is provided with a first water nozzle 120 at the inlet position, and is provided with a second water nozzle 130 at the outlet position.

[0055] In one embodiment, the energy storage device 010 can also include one or more battery clusters 100, and the heat exchange unit 300 directly exchanges heat with the one or more battery clusters 100.

[0056] In the embodiment, the energy storage device 010 includes the heat exchange unit 300.

[0057] In the embodiment, as shown in Figure 1 and Figure 3 , the heat exchange unit 300 is provided with a liquid outlet and a gas return port. The liquid outlet is in communication with the inlet, and the gas return port is in communication with the outlet. The heat exchange unit 300 is used for exchanging heat with the refrigerant to make the refrigerant change phase.

[0058] The heat exchange unit 300 can be a direct cooling unit, and the heat exchange unit 300 is installed on the device body 200.

[0059] In the embodiment, the energy storage device 010 includes the liquid inlet pipe assembly 400.

[0060] The liquid outlet is communicated with the inlet through the liquid inlet pipe assembly 400. The liquid inlet pipe assembly 400 is used to communicate the heat exchange unit 300 and the inlets of the plurality of battery clusters 100; at the same time, the liquid inlet pipe assembly 400 can also distribute the liquid refrigerant, so that the refrigerant flowing out of the heat exchange unit 300 can be uniformly distributed into the liquid cooling flow channel of each battery cluster 100.

[0061] In the embodiment, referring to Figure 3 and Figure 5 , the liquid inlet pipe assembly 400 includes a primary liquid inlet pipe 410, a plurality of secondary liquid inlet pipes 420 and a plurality of tertiary liquid inlet pipes 430. The primary liquid inlet pipe 410 extends from left to right along the arrangement direction of the plurality of mounting racks 210. The secondary liquid inlet pipes 420 extend from top to bottom along the arrangement direction of the plurality of battery clusters 100. The secondary liquid inlet pipes 420 are provided with a secondary liquid inlet end and a plurality of secondary liquid outlet ends. The primary liquid inlet pipe 410 is communicated with the liquid outlet and the secondary liquid inlet end. The plurality of tertiary liquid inlet pipes 430 are respectively communicated with the plurality of secondary liquid outlet ends and the plurality of inlets.

[0062] It can be understood that the heat exchange unit 300 inputs the liquid refrigerant into the primary liquid inlet pipe 410. The primary liquid inlet pipe 410 distributes the liquid refrigerant once and divides it into the secondary liquid inlet pipe 420. The secondary liquid inlet pipe 420 distributes the liquid refrigerant twice and divides it into the tertiary liquid inlet pipe 430. The tertiary liquid inlet pipe 430 transports the liquid refrigerant into the battery, so that the refrigerant flowing out of the heat exchange unit 300 can be uniformly distributed into the liquid cooling flow channel of each battery cluster 100.

[0063] In the embodiment, referring to Figure 4 , the liquid inlet pipe assembly 400 further includes a first connecting flange 440, which can be made of metal. The first connecting flange 440 connects the liquid outlet of the heat exchange unit 300 and the primary liquid inlet pipe 410. The first connecting flange 440 and the liquid outlet of the direct cooling unit are connected by a clamp. The first connecting flange 440 and the primary liquid inlet pipe 410 are rigidly connected by welding.

[0064] In the embodiment, the primary liquid inlet pipe 410 is used to directionally transport the liquid refrigerant to each secondary liquid inlet pipe 420. The primary liquid inlet pipe 410 includes a plurality of primary sub-pipes. The primary sub-pipes are connected by flanges and clamps to form the primary liquid inlet pipe 410.

[0065] In the embodiment, a plurality of secondary liquid outlet ends are arranged on the secondary liquid inlet pipe 420, and a plurality of tertiary liquid inlet pipes 430 are connected to the plurality of secondary liquid outlet ends, so as to realize the secondary distribution of the liquid refrigerant in the secondary liquid inlet pipe 420, so that the liquid refrigerant can be uniformly distributed into each battery cluster 100.

[0066] Optionally, please refer to Figure 5 The secondary liquid inlet pipe 420 includes a plurality of first branch pipes 421 and a first T-shaped tee joint 422, and the plurality of first branch pipes 421 and the first T-shaped tee joint 422 are sequentially connected and composed into the secondary liquid inlet pipe 420 by means of the grafting and welding process. Specifically, the two ends of the first T-shaped tee joint 422 are respectively grafted into two first branch pipes 421, and then welded by high-temperature flame. One of the ports of the first T-shaped tee joint 422 is a secondary liquid outlet end.

[0067] The tertiary liquid inlet pipe 430 is also connected with the first T-shaped tee joint 422 by means of the grafting and welding process.

[0068] Optionally, please refer to Figure 5 The first flow control valve 450 is arranged between the secondary liquid inlet end and the first secondary liquid outlet end of the secondary liquid inlet pipe 420, and the first flow control valve 450 can be made of metal. The first flow control valve 450 and the secondary liquid inlet pipe 420 are connected by means of a quick-change joint. The quick-change joint is divided into two parts, one part is a screw rod type and is rigidly welded with the first flow control valve 450, and the other part is a nut type and is rigidly welded with the secondary liquid inlet pipe 420. When connected, the nut is screwed into the screw rod to realize the connection.

[0069] In this embodiment, the tertiary liquid inlet pipe 430 is connected with the first water nozzle 120 at the inlet through a first quick joint. The first quick joint includes a first body and a second body which are connected in a sealed and rigid manner. The first body is rigidly connected with the tertiary liquid inlet pipe 430 by welding, and the second body is rigidly connected with the first water nozzle 120 by welding.

[0070] Optionally, the pipe diameter of the primary liquid inlet pipe 410 is greater than the pipe diameter of the secondary liquid inlet pipe 420.

[0071] It is worth mentioning that the inlet of the battery cluster 100 needs to receive the liquid refrigerant delivered from the liquid inlet pipe assembly 400 to cool itself to maintain temperature balance, so for the liquid inlet pipe assembly 400, the flow distribution of the liquid supply flow to all battery clusters 100 is required, the more uniform the flow distribution between each battery pack cluster, the smaller the temperature difference between the battery packs. Therefore, the method of controlling the flow distribution between the battery clusters 100 in this embodiment at least includes the following three: 1. The valve opening of the first flow control valve 450 can be controlled to control the flow from the first liquid inlet pipe 410 into the second liquid inlet pipe 420, and then control the flow into each battery cluster 100. 2. The size of the three ports of the first T-shaped tee 422 and the inner diameter of the connection port of the first T-shaped tee 422 and the third liquid inlet pipe 430 are controlled to control the flow of the second liquid inlet pipe 420 into the third liquid inlet pipe 430, and then control the flow into each battery cluster 100. 3. The shape of the third liquid inlet pipe 430 is controlled, please refer to Figure 6 and Figure 7 , for example, the third liquid inlet pipe 430 is provided with at least one bending section 431 to adjust the flow resistance of the third liquid inlet pipe 430, and then control the flow into each battery cluster 100; wherein, by increasing or reducing the number of bending sections on the third liquid inlet pipe 430 and controlling the length or width size of the bending section, the flow resistance of the third liquid inlet pipe 430 in the bending section 431 can be adjusted.

[0072] In this embodiment, the liquid inlet pipe assembly 400 is a metal pipe structure, such as a copper pipe. Because the molecular structure of the refrigerant is small, the metal pipe of the liquid inlet pipe assembly 400 can prevent the refrigerant from leaking from the pipe wall.

[0073] Optionally, the inner diameter of the liquid inlet pipe assembly 400 is 4-15mm. The inner diameter of the first liquid inlet pipe 410, the second liquid inlet pipe 420 and the third liquid inlet pipe 430 is 4-15mm.

[0074] In this embodiment, the energy storage device 010 includes a gas return pipe assembly 500.

[0075] Wherein, the gas return port is communicated with the outlet through the gas return pipe assembly 500, and the gas return pipe assembly 500 uniformly combines and delivers the gaseous refrigerant generated after the heat exchange of the battery cluster 100 into the heat exchange unit 300.

[0076] In this embodiment, please refer to Figure 3 and Figure 5, the return air pipe assembly 500 includes a first return air pipe 510, a plurality of second return air pipes 520 and a plurality of third return air pipes 530, the first return air pipe 510 extends along the arrangement direction of the plurality of mounting racks 210, and the second return air pipe 520 extends along the arrangement direction of the plurality of battery clusters 100; the second return air pipe 520 is provided with a second air inlet end and a plurality of second air outlet ends, the first return air pipe 510 is connected with the return air port and the second air inlet end, and the plurality of third return air pipes 530 are respectively connected with the plurality of second air outlet ends and the plurality of outlets.

[0077] It can be understood that the liquid refrigerant becomes gaseous refrigerant after heat exchange in the battery cluster 100, the gaseous refrigerant in each battery cluster 100 is converged into the second return air pipe 520 through the third return air pipe 530, and the gaseous refrigerant in each second return air pipe 520 is converged into the first return air pipe 510 and then is transported to the heat exchange unit 300.

[0078] In the embodiment, please refer to Figure 4 , the return air pipe assembly 500 further includes a second connecting flange 540, the second connecting flange 540 is connected with the return air port of the heat exchange unit 300 and the first return air pipe 510, and the second connecting flange 540 can be made of metal. The second connecting flange 540 and the return air port of the direct cooling unit are connected through a clamp, and the second connecting flange 540 and the first return air pipe 510 are rigidly connected through welding.

[0079] In the embodiment, the first return air pipe 510 is used for transporting the gaseous refrigerant in each second return air pipe 520 to the heat exchange unit 300, and the first return air pipe 510 includes a plurality of first sub-pipes, the first sub-pipes are connected through flanges and clamps to form the first return air pipe 510.

[0080] In the embodiment, a plurality of second air inlet ends are arranged on the second return air pipe 520, and a plurality of third return air pipes 530 are connected with the plurality of second air inlet ends, so that the gaseous refrigerant in each battery cluster 100 after heat exchange is converged into the second return air pipe 520 through the third return air pipe 530.

[0081] Optionally, please refer to Figure 5 , the second air pipe includes a plurality of second sub-pipes 521 and a second T-shaped tee 522, the plurality of second sub-pipes 521 and the second T-shaped tee 522 are connected through a rigid interference fit insertion process to form the second return air pipe 420, and specifically, the two ends of the second T-shaped tee 522 are inserted into two second sub-pipes 521 respectively. One of the two ports of the second T-shaped tee 522 is a second air inlet end.

[0082] The third air pipe is also connected with the second T-shaped tee 522 through a rigid interference fit insertion process.

[0083] Optionally, the second flow control valve 550 is arranged on the secondary return gas pipe 520, and the second flow control valve 550 is arranged between the secondary gas outlet end and the first secondary gas inlet end of the secondary return gas pipe 520, and the second flow control valve 550 can be made of metal.

[0084] The second flow control valve 550 and the secondary return gas pipe 520 are connected through a quick plug connector; the quick plug connector is divided into two parts; one part is a male connector, which is rigidly welded with the second flow control valve 550; the other part is a female plug connector, which is rigidly inserted with the secondary return gas pipe 520; when the two are connected, the male connector is inserted into the female plug connector, and the female plug connector has a locking structure to realize rigid connection.

[0085] Optionally, the third return gas pipe 530 is communicated with the second water nozzle 130 at the outlet through a second quick connector. The third return gas pipe 530 and the second quick connector are rigidly connected through a rigid interference fit insertion process, the second quick connector is a female quick connector, and the second water nozzle 130 of the battery cluster 100 is a male connector. The male connector is inserted into the female quick connector, and the female quick connector has a locking structure to realize rigid connection.

[0086] In this embodiment, the return gas pipe assembly 500 is a three-layer nylon pipe structure, the wall thickness of the return gas pipe assembly 500 is 1-5mm, the three-layer nylon pipe structure includes an inner wall layer, an intermediate layer and an outer wall layer, the inner wall layer and the outer wall layer are nylon material structures, the intermediate layer is a metal material structure, and the thickness ratio of the inner wall layer, the intermediate layer and the outer wall layer is 4:2:4 or 3:4:3 or 3.5:3:3.5.

[0087] It is worth mentioning that the pipe diameter of the return gas pipe assembly 500 is larger than that of the liquid inlet pipe assembly 400, because the volume of gaseous refrigerant is large, and a larger pipe diameter can effectively control the pressure of the battery cluster 100 at the outlet; wherein the pipe diameter of the liquid inlet pipe assembly 400 is 4-15mm, and the inner diameter of the return gas pipe assembly 500 is 10-30mm.

[0088] The working principle and process of the energy storage device 010 provided in the embodiment of the utility model are as follows:

[0089] The heat exchange unit 300 inputs the liquid refrigerant into the primary liquid inlet pipe 410, the primary liquid inlet pipe 410 divides the liquid refrigerant once and divides it into the secondary liquid inlet pipe 420, the secondary liquid inlet pipe 420 divides the liquid refrigerant twice and divides it into the tertiary liquid inlet pipe 430, and the liquid refrigerant in the tertiary liquid inlet pipe 430 is delivered into the battery to make the refrigerant flowing out of the heat exchange unit 300 be evenly distributed and flow into the liquid cooling flow channel of each battery cluster 100.

[0090] The liquid refrigerant becomes gaseous refrigerant after heat exchange in the battery cluster 100, the gaseous refrigerant in each battery cluster 100 is merged into the secondary gas return pipe 520 through the tertiary gas return pipe 530, the gaseous refrigerant in each secondary gas return pipe 520 is merged into the primary gas return pipe 510, and the gaseous refrigerant is directed to the heat exchange unit 300 through the primary gas return pipe 510. The heat exchange unit 300 compresses and cools the gaseous refrigerant, and then the gaseous refrigerant is condensed into liquid refrigerant.

[0091] Compared with the existing energy storage device 010, the plate heat exchanger and the cooling liquid circuit are arranged in the liquid cooling unit, and the application has the following differences: 1. The manufacturing and installation methods of the pipelines are different. The connection process between the existing liquid cooling pipelines is a cold plug process, and the male and female joint plug-in process. The connection process between the liquid inlet pipe assembly 400 and the gas return pipe assembly 500 of the application is a welding process, a male and female joint plug-in process, and a screw and nut connection process. 2. The structure is different. The existing liquid cooling pipeline is divided into a liquid inlet pipe assembly 400 and a liquid return pipe assembly 400. The application is respectively a liquid inlet pipe assembly 400 and a gas return pipe assembly 500. 3. The weight is different. The heat exchange unit 300 of the application reduces the cooling liquid, the cooling liquid circulating pump, the cooling liquid pipeline in the unit, and other components, and the weight is reduced. 4. The cost is different. The heat exchange unit 300 of the application reduces the cooling liquid, the cooling liquid circulating pump, the cooling liquid pipeline in the unit, and other components, and the cost is reduced. 5. The existing liquid cooling system needs to be replaced every 5-8 years. The application does not need to be replaced, which reduces the initial investment and operating cost of the system. 6. The system integration of the application is high, and the weight is light. 7. The safety of the system is high, and there is no risk of cooling liquid leakage.

[0092] In summary, the energy storage device 010 provided by the embodiment of the application cancels the plate heat exchanger and the cooling liquid circuit, and directly cools and exchanges heat for the battery cluster 100 by arranging the heat exchange unit 300, thereby solving the problem of partial heat loss caused by secondary heat exchange between the plate heat exchanger and the battery cluster 100, improving the heat exchange efficiency, reducing the components, and reducing the cost of the heat management components.

[0093] The above is only a specific implementation manner of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. An energy storage device, characterized by, The application relates to a storage energy device. The device comprises at least one battery cluster, a heat exchange unit, a liquid inlet pipe assembly and a gas return pipe assembly. The battery cluster is internally provided with a liquid cooling flow channel for flowing refrigerant, and the liquid cooling flow channel is provided with an inlet and an outlet.

2. The energy storage device of claim 1, wherein, The heat exchange unit is provided with a liquid outlet and a gas return outlet, the liquid outlet is communicated with the inlet, the gas return outlet is communicated with the outlet, and the heat exchange unit is used for heat exchange with the refrigerant to make the refrigerant change phase. The liquid outlet is communicated with the inlet through the liquid inlet pipe assembly.

3. The energy storage device of claim 2, wherein, The gas return outlet is communicated with the outlet through the gas return pipe assembly. The pipe diameter of the gas return pipe assembly is larger than that of the liquid inlet pipe assembly.

4. The energy storage device of claim 2, wherein, The pipe diameter of the liquid inlet pipe assembly ranges from 4 to 15 mm, and the pipe diameter of the gas return pipe assembly ranges from 10 to 30 mm. The liquid inlet pipe assembly is a metal pipe structure.

5. The energy storage device of claim 2, wherein, The gas return pipe assembly is a three-layer nylon pipe structure, the wall thickness of the gas return pipe assembly is 1-5 mm, the three-layer nylon pipe structure comprises an inner wall layer, an intermediate layer and an outer wall layer, the inner wall layer and the outer wall layer are nylon material structures, the intermediate layer is a metal material structure, and the thickness ratio of the inner wall layer, the intermediate layer and the outer wall layer is 4:2:4, 3:4:3 or 3.5:3:3.

5. The storage energy device comprises a device body, a plurality of mounting racks and a skin, the skin is arranged around the device body, a plurality of mounting racks are sequentially arranged on the device body, and a plurality of battery clusters are sequentially arranged on the mounting racks.

6. The energy storage device of claim 5, wherein, Each battery cluster is provided with a high-low voltage control system. The liquid inlet pipe assembly comprises a primary liquid inlet pipe, a plurality of secondary liquid inlet pipes and a plurality of tertiary liquid inlet pipes, the primary liquid inlet pipe extends along the arrangement direction of the mounting racks, and the secondary liquid inlet pipes extend along the arrangement direction of the battery clusters.

7. The energy storage device of claim 6, wherein, The secondary liquid inlet pipe is provided with a secondary liquid inlet end and a plurality of secondary liquid outlet ends, the primary liquid inlet pipe is communicated with the liquid outlet and the secondary liquid inlet end, and the plurality of tertiary liquid inlet pipes are respectively communicated with the plurality of secondary liquid outlet ends and the plurality of inlets. The pipe diameter of the primary liquid inlet pipe is larger than that of the secondary liquid inlet pipe. The tertiary liquid inlet pipe is communicated with the inlet through a first quick connector.

8. The energy storage device of claim 6, wherein, The secondary liquid inlet pipe is provided with a first flow control valve.

9. The energy storage device of claim 5, wherein, The tertiary liquid inlet pipe is provided with at least one bending section. The gas return pipe assembly comprises a primary gas return pipe, a plurality of secondary gas return pipes and a plurality of tertiary gas return pipes, the primary gas return pipe extends along the arrangement direction of the mounting racks, and the secondary gas return pipes extend along the arrangement direction of the battery clusters.

10. The energy storage device of claim 9, wherein, The secondary gas return pipe is provided with a secondary gas outlet end and a plurality of secondary gas inlet ends, the primary gas return pipe is communicated with the gas return outlet and the secondary gas outlet end, and the plurality of tertiary gas return pipes are respectively communicated with the plurality of secondary gas inlet ends and the plurality of outlets. The pipe diameter of the primary gas return pipe is larger than that of the secondary gas return pipe. The tertiary gas return pipe is communicated with the outlet through a second quick connector. The secondary gas return pipe is provided with a second flow control valve.

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