A direct-cooling energy storage cabinet cooling system and energy storage cabinet

Abstract

The patent application belongs to the technical field of energy storage cabinet cooling, and particularly relates to a direct-cooling type energy storage cabinet cooling system, which comprises a liquid inlet pipeline communicated with a direct-cooling unit, a liquid distribution assembly and a plurality of liquid inlet branch pipes. The liquid distribution assembly distributes the refrigerant in the liquid inlet pipeline to the plurality of liquid inlet branch pipes through a plurality of distribution ports. The plurality of liquid inlet branch pipes correspond to a plurality of battery packs one by one, and the flow resistance in each liquid inlet branch pipe is the same. When the direct-cooling unit works, the refrigerant is transmitted to the liquid distribution assembly through the liquid inlet pipeline, and is then distributed to the plurality of liquid inlet branch pipes through the distribution ports of the liquid distribution assembly. Since the flow resistance in the liquid inlet branch pipes is the same, the flow rate distributed in each liquid inlet branch pipe is the same. The purpose is to make the flow rate of the refrigerant passing through each battery pack the same by arranging the liquid distribution assembly and the liquid distribution pipes with the same flow resistance, thereby effectively improving the uniformity of the refrigerant flow rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage cabinet cooling, in particular to a direct-cooling energy storage cabinet cooling system and energy storage cabinet. BACKGROUND

[0002] Compared with air-cooled or liquid-cooled, the direct-cooling energy storage cabinet circulates refrigerant directly into the cold plate through the circulating pipeline, and directly absorbs the heat generated by the battery in the charging and discharging process by using the cold plate closely attached to the battery pack, so that the heat exchange efficiency of the direct-cooling energy storage cabinet is higher.

[0003] The energy storage cabinet has multiple batteries, and the circulating pipeline needs to be provided with multiple branch pipes to guide the refrigerant to each battery pack. The existing circulating pipeline design generally follows a "rich" layout, in which the main pipeline extends from the bottom of the direct-cooling unit to the top of the battery compartment, and the branch pipeline is branched from the main pipeline to each battery pack. In the above structure, the total length of the pipeline between the outlet of the direct-cooling unit and each battery pack is different due to the different heights of each battery pack, resulting in different flow resistances in each branch pipe. Therefore, the higher the height of the battery pack, the greater the flow resistance in the corresponding pipeline, resulting in smaller flow in the corresponding pipeline, which in turn leads to uneven flow distribution in the entire cabinet, which is not conducive to overall temperature control. If a flow control valve is installed on each branch pipe, the flow can be evenly distributed, but multiple flow control valves will complicate the structure of the circulating pipeline and increase the cost of equipment. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present application is to provide a direct-cooling energy storage cabinet cooling system with uniform refrigerant flow.

[0005] The technical solution adopted by the present application is as follows:

[0006] A direct-cooling energy storage cabinet cooling system, comprising an inlet pipeline in communication with a direct-cooling unit, further comprising a liquid distribution assembly and a plurality of inlet branch pipes, the liquid distribution assembly distributes the refrigerant in the inlet pipeline to the plurality of inlet branch pipes through a plurality of distribution ports, the plurality of inlet branch pipes correspond one-to-one to a plurality of battery packs, and the flow resistance in each inlet branch pipe is the same.

[0007] Working principle: when the direct-cooling unit is working, the refrigerant is transmitted to the liquid distribution assembly through the inlet pipeline, and then distributed to the plurality of inlet branch pipes through the distribution ports of the liquid distribution assembly. Since the flow resistance in each inlet branch pipe is the same, the flow distributed in each inlet branch pipe is the same.

[0008] Compared with the prior art, the present application has the following advantages:

[0009] By providing a liquid distribution assembly and a liquid distribution pipe with the same flow resistance, the refrigerant flow through each battery pack is the same, effectively improving the uniformity of the refrigerant flow.

[0010] As a preferred embodiment of the present application, the liquid distribution assembly comprises a liquid distributor, the lower end surface of the liquid distributor is provided with a liquid inlet hole in communication with the liquid inlet pipeline, and the upper end surface of the liquid distributor is annularly provided with a plurality of liquid distribution holes in communication with the liquid inlet hole.

[0011] Advantages:

[0012] 1. After the refrigerant passes through the liquid inlet hole, the refrigerant will flow to the surrounding liquid distribution holes in a scattered manner. The annular arrangement of the liquid distribution holes around the liquid inlet hole makes the flow into each liquid inlet branch pipe more uniform.

[0013] 2. Due to the nature of the refrigerant, when the refrigerant flows out of the direct cooling unit, it is in a two-phase state (both gaseous and liquid states). In the same space in the pipe body, the gaseous refrigerant will be mostly distributed above the space under the influence of gravity. For a horizontally arranged liquid distributor, the gaseous refrigerant will try to stay in the upper distribution holes. The liquid inlet hole of this liquid distributor faces downward, the liquid outlet hole faces upward, and the whole is in a vertical state. The distribution direction is arranged around the vertical center line, so that the gaseous refrigerant is more uniformly distributed in the space.

[0014] As a preferred embodiment of the present application, the liquid distribution hole is a stepped hole with a large upper part and a small lower part, and the upper part of the stepped hole is in communication with the corresponding liquid inlet branch pipe.

[0015] Advantages:

[0016] 1. When directly distributing the two-phase refrigerant, the distribution of gaseous refrigerant in liquid refrigerant is not easy to control, and the distribution of gaseous refrigerant will affect the local pressure, thereby affecting the uniformity after distribution. The two-phase refrigerant in the liquid inlet pipeline is under the power of the compressor, and the refrigerant enters the liquid distributor with high pressure and high flow rate. Except for the communication part between the liquid inlet hole and the liquid distribution hole, the upper end of the remaining liquid inlet holes is in a closed state. When the refrigerant with high flow rate and in two-phase state is blocked, it will be atomized, which plays a role in fully mixing the gas-liquid two-phase. Compared with direct distribution, the distribution of refrigerant in the atomized state is more uniform.

[0017] 2. By limiting the aperture ratio of the lower part of the stepped hole to the liquid inlet hole, within the range of the ratio, the distribution of the atomized refrigerant is more uniform.

[0018] 3. By setting the stepped hole, the atomization condition is met, and the liquid inlet branch pipe is easy to install.

[0019] As a preferred embodiment of the present application, the length and pipe diameter of each liquid inlet branch pipe are equal.

[0020] Beneficial effects: by limiting the length and pipe diameter of each liquid inlet branch pipe, the space in the pipeline between the liquid distribution position and the battery pack is equal, so that the flow resistance in each liquid inlet branch pipe is equal, thereby improving the uniformity of the refrigerant flow.

[0021] As a preferred embodiment of the present application, each of the liquid inlet branch pipes comprises a vertical part and a horizontal part, the vertical part of each of the liquid inlet branch pipes is bent downward by 180° and then bent by 90° to form the horizontal part according to the height of the corresponding battery pack, and the length of each of the horizontal parts is the same.

[0022] Beneficial effects:

[0023] 1. By folding 180°, the height of each vertical part can be effectively reduced, and the bending of the pipeline will locally generate resistance, but the pressure in the entire circulating pipeline is large when the direct cooling unit is running, so the flow resistance generated by the bending can be ignored.

[0024] 2. By arranging the parallel vertical parts and horizontal parts, the overall appearance is more beautiful.

[0025] As a preferred embodiment of the present application, the liquid inlet pipeline and the plurality of vertical parts are located on the same side of the cabinet, the plurality of vertical parts are vertically spaced and wrapped with thermal insulation cotton, and the thermal insulation cotton is clamped in the limiting plate of the cabinet.

[0026] Beneficial effects:

[0027] 1. The plurality of pipelines are arranged on the same side of the cabinet and wrapped with thermal insulation cotton to form a bundle, so that the overall space occupied is small and the installation on the cabinet is convenient.

[0028] 2. The vertical parts are wrapped with thermal insulation cotton, and since the folded vertical parts are in contact with each other, after the refrigerant is divided, the folded pipeline will exchange heat with the adjacent pipeline, thereby better ensuring that the refrigerant temperature in each liquid inlet branch pipe is the same, and the length of each horizontal part is the same. Therefore, although the horizontal part is not wrapped, the time of each refrigerant passing through each horizontal part is the same, thereby ensuring the uniformity of the refrigerant temperature entering each battery pack.

[0029] As a preferred embodiment of the present application, the plurality of liquid inlet branch pipes gradually decrease in size from top to bottom.

[0030] Beneficial effects: without folding the liquid inlet branch pipe, for a battery pack with a higher height, the length of the liquid inlet branch pipe is longer, and therefore the flow resistance of the liquid inlet branch pipe increases from top to bottom. Since the smaller the pipe diameter, the greater the flow resistance, by limiting the pipe diameter of each liquid inlet branch pipe, the flow resistance of the liquid inlet pipeline at a lower position is increased, thereby ensuring that the flow resistance of the liquid inlet pipeline at each height is the same, thereby ensuring the uniformity of the refrigerant flow.

[0031] As a preferred embodiment of the present application, the liquid inlet pipeline is provided with a sight glass.

[0032] Beneficial effects: By setting the sight glass, the internal refrigerant state can be observed without disassembling the pipeline, which is convenient for daily maintenance and repair.

[0033] As a preferred embodiment of the present application, the liquid inlet pipeline is provided with a sight glass.

[0034] Beneficial effects: After passing through the battery pack, most of the refrigerant is gaseous, which needs to be returned to the heat exchanger or compressor. It is not necessary to ensure the uniformity of each branch flow, but only needs to be converged to a pipeline. Therefore, by using the above structure, the total length of the liquid return pipeline and the liquid return branch pipe is reduced as much as possible, thereby saving the manufacturing cost.

[0035] The second purpose of the present application is to provide a storage cabinet, which adopts the above-mentioned direct cooling type storage cabinet cooling system, and the temperature control of each battery pack is more accurate when the cooling system works. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the overall structure schematic diagram of the direct cooling type storage cabinet cooling system embodiment one of the present application;

[0037] Figure 2 is the structure schematic diagram of the liquid inlet pipeline and the liquid inlet branch in the direct cooling type storage cabinet cooling system embodiment one of the present application;

[0038] Figure 3 is the structure schematic diagram of the liquid return pipeline and the liquid return branch in the direct cooling type storage cabinet cooling system embodiment two of the present application; Figure 2 is the structure enlarged view of A in the direct cooling type storage cabinet cooling system embodiment two of the present application;

[0039] Figure 4 is the sectional view of the liquid distributor in the direct cooling type storage cabinet cooling system embodiment one of the present application;

[0040] Figure 5 is the plane schematic diagram of the liquid inlet pipeline and the liquid inlet branch in the direct cooling type storage cabinet cooling system embodiment two of the present application;

[0041] Figure 6 is the plane schematic diagram of the liquid return pipeline and the liquid return branch in the direct cooling type storage cabinet cooling system embodiment two of the present application.

[0042] The reference signs include: battery cabin 1, battery pack 11, electrical cabin 2, direct cooling unit 21, liquid inlet pipeline 31, liquid inlet branch pipe 32, vertical part 321, horizontal part 322, liquid distribution assembly 4, liquid distributor 41, liquid inlet hole 411, liquid distribution hole 412, liquid return pipeline 51, liquid return branch pipe 52, limiting plate 6, sight glass 7. DETAILED DESCRIPTION

[0043] The exemplary embodiments embodying the features and advantages of the present application will be described in detail hereinafter. It should be understood that the present application can be varied in a wide range of embodiments, all of which are not departing from the scope of the present application, and the description and drawings herein are intended to be illustrative in nature, not restrictive.

[0044] In the description of the present application, the terms "first", "second", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structures referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] Embodiment one:

[0046] Referring to Figure 1 As shown in the figure, the direct cooling energy storage cabinet cooling system of the embodiment includes a direct cooling unit 21, a liquid inlet pipeline 31, a liquid distribution assembly 4, a plurality of liquid inlet branch pipes 32, a liquid return pipeline 51, and a plurality of liquid return branch pipes 52. The plurality of liquid inlet branch pipes 32 correspond to the plurality of battery packs 11 one by one. The refrigerant enters the liquid inlet pipeline 31 through the direct cooling unit 21, is then distributed to the plurality of liquid inlet branch pipes 32 through the liquid distribution assembly 4, passes through the corresponding battery packs 11, is then converged to the liquid return pipeline 51 through the corresponding liquid return branch pipes 52, and finally returns to the direct cooling unit 21.

[0047] Among them, referring to Figure 4 As shown in the figure, the liquid distribution assembly 4 includes a liquid distributor 41, the lower end surface of the liquid distributor 41 is provided with a liquid inlet hole 411 in communication with the liquid inlet pipeline 31, and the upper end surface of the liquid distributor 41 is annularly provided around the liquid inlet hole 411 with a plurality of liquid distribution holes 412 in communication with the liquid inlet hole 411. After the refrigerant passes through the liquid inlet hole 411, the refrigerant will flow to the surrounding liquid distribution holes 412 in a scattered manner. The liquid distribution holes 412 are annularly arranged around the liquid inlet hole 411, so that the flow rate into each liquid inlet branch pipe 32 is more uniform.

[0048] In the embodiment, due to the nature of the refrigerant itself, when the refrigerant flows out of the direct cooling unit 21, it is in a two-phase state (both gaseous and liquid states) in the same space in the pipe body. Under the influence of gravity, the gaseous refrigerant will be mostly distributed above the space. For the transversely arranged liquid distributor, the gaseous refrigerant will stay in the upper distribution hole as much as possible. The liquid inlet hole 411 of the liquid distributor 41 is downward, the liquid outlet hole is upward, and the whole is in a vertical state. The distribution direction is arranged around the vertical center line, so that the gaseous refrigerant is more uniformly distributed in the space.

[0049] The liquid distribution hole 412 is a stepped hole with a larger upper part and a smaller lower part. The upper part of the stepped hole is connected to the corresponding liquid inlet branch pipe 32. By limiting the ratio of the lower part of the stepped hole to the liquid inlet hole 411, the refrigerant is more evenly distributed after atomization within this ratio range.

[0050] In this embodiment, when the two-phase refrigerant is directly split, the distribution of the gaseous refrigerant in the liquid refrigerant is difficult to control. The distribution of the gaseous refrigerant will affect the local pressure, thereby affecting the uniformity after splitting. The two-phase refrigerant in the liquid inlet pipe 31 enters the distributor 41 under the power of the compressor. The two-phase refrigerant is atomized, which plays a role in fully mixing the gas and liquid phases. Compared with direct splitting, the splitting of the atomized refrigerant is more uniform.

[0051] Among them, see Figure 2 As shown, the length and diameter of each liquid inlet branch pipe 32 are equal; by limiting the length and diameter of each liquid inlet branch pipe 32, the internal space of the pipe from the liquid distribution position to the battery pack 11 is equal, so that the flow resistance in each liquid inlet branch pipe 32 is equal, thereby improving the uniformity of refrigerant flow.

[0052] Among them, see Figure 3 As shown, each of the liquid inlet branch pipes 32 includes a vertical part 321 and a horizontal part 322. The vertical part 321 of each liquid inlet branch pipe 32 is folded downward by 180° according to the height of the corresponding battery pack 11, so that the horizontal parts 322 of each liquid inlet branch pipe 32 are arranged in parallel. By folding by 180°, the height of each vertical part 321 can be effectively reduced.

[0053] Among them, see Figure 1 As shown, the liquid inlet pipe 31 and the multiple vertical parts 321 are all located on the same side of the cabinet. The multiple vertical parts 321 are vertically spaced and wrapped with insulation cotton, which is secured in the limiting plate 6 of the cabinet. By setting multiple pipes on the same side of the cabinet and wrapping them with insulation cotton to form a bundle, the overall space occupied is small and it is convenient to install on the cabinet.

[0054] In this embodiment, the vertical section 321 is wrapped with insulation cotton. Since the folded vertical sections 321 are in contact with each other, multiple vertical sections 321 are in contact with each other. After the refrigerant is diverted, the pipes of the folded parts will exchange heat with the adjacent pipes, which better ensures that the refrigerant temperature in each liquid inlet branch pipe 32 is the same. In addition, the length of each horizontal section 322 is the same. Therefore, although the horizontal section 322 is not wrapped, the time for each segment of refrigerant to pass through each horizontal section 322 is the same, ensuring the uniformity of the refrigerant temperature entering each battery pack 11.

[0055] The application further discloses a storage cabinet, which comprises a battery cabin 1, an electrical cabin 2 and the direct-cooling storage cabinet cooling system, the electrical cabin 2 is located below the battery cabin 1, a plurality of battery packs 11 are stacked in the battery cabin 1, and a direct-cooling unit 21 is located in the electrical cabin 2.

[0056] Embodiment two:

[0057] Referring to FIG. 1, Figure 5 As shown in FIG. 1, the direct-cooling storage cabinet cooling system of the embodiment is based on the first embodiment, a plurality of the liquid inlet branch pipes 32 are gradually reduced in diameter from top to bottom, instead of the liquid inlet branch pipes 32 of the same length, without bending and stacking the liquid inlet branch pipes 32, for the battery pack 11 with a higher height, the longer the length of the liquid inlet branch pipe 32, therefore, the greater the flow resistance of the liquid inlet branch pipe 32 from top to bottom, and the smaller the diameter, the greater the flow resistance, by limiting the diameter of each liquid inlet branch pipe 32, the flow resistance of the liquid inlet pipeline at a lower position is improved, so that the flow resistance of each height is ensured to be the same, and the uniformity of the refrigerant flow is ensured.

[0058] The liquid inlet pipeline 31 is provided with a sight glass 7, the internal refrigerant state can be observed without disassembling the pipeline, and daily maintenance and repair are facilitated.

[0059] Embodiment three:

[0060] Referring to FIG. 1, Figure 6 As shown in FIG. 1, the direct-cooling storage cabinet cooling system of the embodiment is based on the first embodiment, a plurality of the liquid inlet branch pipes 32 are gradually reduced in diameter from top to bottom, instead of the liquid inlet branch pipes 32 of the same length, without bending and stacking the liquid inlet branch pipes 32, for the battery pack 11 with a higher height, the longer the length of the liquid inlet branch pipe 32, therefore, the greater the flow resistance of the liquid inlet branch pipe 32 from top to bottom, and the smaller the diameter, the greater the flow resistance, by limiting the diameter of each liquid inlet branch pipe 32, the flow resistance of the liquid inlet pipeline at a lower position is improved, so that the flow resistance of each height is ensured to be the same, and the uniformity of the refrigerant flow is ensured.

[0061] The above-mentioned embodiments are only preferred embodiments of the application, and cannot be used to limit the protection scope of the application, and any non-essential changes and replacements made by those skilled in the art on the basis of the application all belong to the protection scope of the application.

Claims

1. A direct-cooling energy storage cabinet cooling system, comprising a liquid inlet pipe connected to a direct-cooling unit, characterized in that: It also includes a liquid distribution assembly and multiple liquid inlet branches. The liquid distribution assembly distributes the refrigerant in the liquid inlet pipeline to multiple liquid inlet branches through multiple diversion ports. Each liquid inlet branch corresponds to a battery pack, and the flow resistance in each liquid inlet branch is the same. The length of each of the inlet branch pipes is equal, and the diameter of each of the inlet branch pipes is equal. Each of the liquid inlet branch pipes includes a vertical section and a horizontal section. The vertical section of each liquid inlet branch pipe is bent downwards by 180° according to the height of the corresponding battery pack, and then bent downwards by 90° to form a horizontal section. The length of each horizontal section is the same. The liquid inlet pipe and the multiple vertical sections are all located on the same side of the cabinet. The multiple vertical sections are vertically spaced and wrapped with insulation cotton, which is secured within the limiting plate of the cabinet.

2. The direct-cooling energy storage cabinet cooling system according to claim 1, characterized in that: The liquid separation assembly includes a liquid separator. The lower end face of the liquid separator is provided with an inlet hole that communicates with the liquid inlet pipe. The upper end face of the liquid separator is provided with a plurality of liquid separation holes that communicate with the inlet hole in a ring around the inlet hole.

3. The direct-cooling energy storage cabinet cooling system according to claim 2, characterized in that: The liquid distribution hole is a stepped hole with a larger upper part and a smaller lower part, and the upper part of the stepped hole is connected to the corresponding liquid inlet branch pipe.

4. The direct-cooling energy storage cabinet cooling system according to claim 1, characterized in that: A sight glass is installed on the liquid inlet pipe.

5. The direct-cooling energy storage cabinet cooling system according to claim 1, characterized in that: It also includes a return liquid pipeline connected to the direct cooling unit and multiple return liquid branch pipes. The multiple return liquid branch pipes are arranged horizontally in parallel and correspond one-to-one with multiple battery packs. The return liquid pipeline is arranged vertically in the battery compartment and is connected to each return liquid branch pipe.

6. An energy storage cabinet, characterized in that, The direct-cooling energy storage cabinet cooling system according to any one of claims 1 to 5 is adopted.

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