Direct cooling type energy storage cabinet cooling system and energy storage cabinet

Abstract

The invention 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 and further comprises a liquid distribution assembly and a plurality of liquid inlet branch pipes, and the liquid distribution assembly distributes refrigerants in the liquid inlet pipeline into the liquid inlet branch pipes through a plurality of flow distribution openings. The plurality of liquid inlet branch pipes are in one-to-one correspondence with the plurality of battery packs, and the flow resistance in each liquid inlet branch pipe is the same; when the direct cooling unit works, a refrigerant is transmitted to the liquid distribution assembly through the liquid inlet pipeline and then is distributed into the liquid inlet branch pipes through the flow distribution openings of the liquid distribution assembly, and due to the fact that the flow resistance in the liquid inlet branch pipes is the same, the flow distributed in the liquid inlet branch pipes is the same; the invention aims to provide a liquid distribution assembly and a liquid distribution pipe with the same flow resistance, so that the flow of refrigerant passing through each battery pack is the same, and the uniformity of the flow of the refrigerant is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage cabinet cooling, and particularly relates to a direct cooling type energy storage cabinet cooling system and an energy storage cabinet. Background Art

[0002] Different from air cooling or liquid cooling, in a direct cooling type energy storage cabinet, the refrigerant is directly circulated into the cold plate through a circulation pipeline, and the cold plate is closely attached to the battery pack to more directly absorb the heat generated by the battery during charging and discharging, so that the heat exchange efficiency of the direct cooling type energy storage cabinet is higher.

[0003] The energy storage cabinet has multiple batteries, and multiple branch pipes need to be provided in the circulation pipeline to direct the refrigerant to each battery pack. The existing circulation pipeline design generally adopts a "rich" - shaped layout. The main pipeline extends from the direct cooling unit below to the top of the battery compartment, and the branch pipelines are branched from the main pipeline into each battery pack; in the above - mentioned structure, due to the different heights of each battery pack, the total length of the pipeline from the liquid outlet of the direct cooling unit to each battery pack is different, 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 a smaller flow rate in the corresponding pipeline, and further leading 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 pipeline, the flow rate can be guaranteed to be uniform, but multiple flow control valves will make the circulation pipeline structure complex and the equipment cost higher. Summary of the Invention

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

[0005] The technical solution adopted by the present invention is as follows: A direct cooling type energy storage cabinet cooling system includes a liquid inlet pipeline communicated with a direct cooling unit, and also includes a liquid distribution component and multiple liquid inlet branch pipes. The liquid distribution component divides the refrigerant in the liquid inlet pipeline into multiple liquid inlet branch pipes through multiple diversion ports. The multiple liquid inlet branch pipes correspond to multiple battery packs one by one, and the flow resistance in each liquid inlet branch pipe is the same.

[0006] Working principle: When the direct cooling unit works, the refrigerant is transmitted to the liquid distribution component through the liquid inlet pipeline, and then is divided into multiple liquid inlet branch pipes through the diversion ports of the liquid distribution component. 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.

[0007] Compared with the prior art, the beneficial effect of the present invention is as follows: By setting the liquid distribution component and the liquid distribution pipes with the same flow resistance, the refrigerant flow rate passing through each battery pack is the same, effectively improving the uniformity of the refrigerant flow rate.

[0008] As a preferred embodiment of the present invention, the liquid separation component includes a liquid separator, the lower end face of the liquid separator is provided with a liquid inlet hole connected to the liquid inlet pipeline, and the upper end face of the liquid separator is provided with a plurality of liquid separation holes connected to the liquid inlet hole in a ring shape around the liquid inlet hole.

[0009] Beneficial effects: 1. After the refrigerant passes through the liquid inlet hole, it will flow to the surrounding liquid separation holes in a scattered manner. The liquid separation holes are arranged in a ring around the liquid inlet hole, so that the flow entering each liquid inlet branch pipe is more uniform.

[0010] 2. Due to the nature of the refrigerant itself, the refrigerant is in a two-phase state (gas and liquid exist at the same time) when it flows out of the direct cooling unit. In the same section of space in the pipe body, the gaseous refrigerant will be mostly distributed above the space under the influence of gravity. For the horizontally arranged liquid distributor, the gaseous refrigerant will be retained in the upper diversion hole as much as possible. The liquid inlet of the liquid distributor faces downward and the liquid outlet faces upward. The whole is in a vertical state. The direction of the diversion is set around the vertical center line, so that the gaseous refrigerant is more evenly distributed in the space.

[0011] As a preferred embodiment of the present invention, the liquid separation hole is a stepped hole that is larger at the top and smaller at the bottom, and the upper portion of the stepped hole is connected to the corresponding liquid inlet branch pipe.

[0012] Beneficial effects: 1. When the two-phase refrigerant is directly diverted, the distribution of the gaseous refrigerant in the liquid refrigerant is difficult to control, and the distribution of the gaseous refrigerant will affect the local pressure, thereby affecting the uniformity after diversion. The two-phase refrigerant in the liquid inlet pipeline is under the power of the compressor. When the refrigerant enters the liquid separator, the pressure is relatively high and the flow rate is relatively fast. Except for the connecting part between the liquid inlet hole and the liquid separation hole, the upper end of the other liquid inlet holes is in a closed state. The refrigerant in the two-phase state with a fast flow rate is blocked and atomized, which plays a role in fully mixing the gas and liquid phases. Compared with direct diversion, the refrigerant in the atomized state is more uniform when it is diverted.

[0013] 2. By limiting the aperture ratio between the lower part of the stepped hole and the liquid inlet hole, within the ratio range, the refrigerant is more evenly distributed after atomization.

[0014] 3. By setting the stepped holes, the atomization conditions are met and the liquid inlet branch pipe is easy to install.

[0015] As a preferred embodiment of the present invention, the length and diameter of each of the liquid inlet branches are equal.

[0016] Beneficial effect: By limiting the length and diameter of each liquid inlet branch pipe, the space in the pipeline from the liquid separation position to 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.

[0017] As a preferred embodiment of the present invention, each of the liquid inlet branch pipes includes a vertical portion and a transverse portion. The vertical portion of each of the liquid inlet branch pipes is bent downward 180° according to the corresponding battery pack height, and then bent 90° to form a transverse portion, and the length of each of the transverse portions is the same.

[0018] Beneficial effects: 1. By folding 180°, the height of each vertical part can be effectively reduced. The bending of the pipe will generate resistance locally, but when the direct cooling unit is in operation, the pressure in the entire circulation pipeline is relatively high, and the flow resistance caused by the bending can be ignored.

[0019] 2. By arranging the vertical part and the horizontal part in parallel, the overall appearance is more beautiful.

[0020] As a preferred embodiment of the present invention, the liquid inlet pipeline and the multiple vertical parts are located on the same side of the cabinet, and the multiple vertical parts are vertically wrapped with insulation cotton at intervals, and the insulation cotton is engaged in the limiting plate of the cabinet.

[0021] Beneficial effects: 1. Set multiple pipes on the same side of the cabinet and wrap them with thermal insulation cotton to form a whole bundle, so that the overall space occupied is small and it is convenient to install on the cabinet.

[0022] 2. The vertical part is wrapped with thermal insulation cotton. Since the folded vertical parts are in contact with each other, after the refrigerant is diverted, the pipes in the folded part will exchange heat with the adjacent pipes, which better ensures that the refrigerant temperature in each liquid inlet branch pipe is the same. The length of each horizontal part is the same. Therefore, although the horizontal part is not wrapped, the time for each section of refrigerant to pass through each horizontal part is the same, ensuring the uniformity of the refrigerant temperature entering each battery pack.

[0023] As a preferred embodiment of the present invention, the diameters of the plurality of liquid inlet branches gradually decrease from top to bottom.

[0024] Beneficial effect: Without bending or overlapping the liquid inlet branch pipe, for a battery pack with a higher height, the longer the length of the liquid inlet branch pipe is, the greater the flow resistance of the liquid inlet branch pipe 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 pipe at a lower position is increased, thereby ensuring that the flow resistance of the liquid inlet pipe at each height is the same, thereby ensuring the uniformity of the refrigerant flow.

[0025] As a preferred embodiment of the present invention, a sight glass is provided on the liquid inlet pipeline.

[0026] Beneficial effect: By setting up a sight glass, the internal refrigerant status can be observed without disassembling the pipeline, which is convenient for daily maintenance and inspection.

[0027] As a preferred embodiment of the present invention, it also includes a liquid return pipeline and multiple liquid return branches connected to the direct cooling unit. The multiple liquid return branches are arranged horizontally in parallel and correspond one to one to multiple battery packs. The liquid return pipeline is vertically arranged in the battery compartment and connected to each liquid return branch.

[0028] Beneficial effect: After passing through the battery pack, most of the refrigerant is in gaseous state and needs to be returned to the regenerator or compressor. There is no need to ensure the uniformity of each branch, and they only need to be converged into one pipeline. Therefore, the above structure is adopted to minimize the total length of the return liquid pipeline and the return liquid branch pipe, thereby saving manufacturing costs.

[0029] A second object of the present invention is to provide an energy storage cabinet that uses the above-mentioned direct-cooling energy storage cabinet cooling system, so that when the cooling system is working, the temperature of each battery pack can be controlled more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the direct-cooling energy storage cabinet cooling system of the present invention; Figure 2 It is a structural schematic diagram of the liquid inlet pipeline and the liquid inlet branch in the first embodiment of the cooling system of the direct-cooling energy storage cabinet of the present invention; Figure 3 The present invention Figure 2 A magnified view of the structure at A; Figure 4 It is a cross-sectional view of the liquid distributor in the first embodiment of the direct-cooling energy storage cabinet cooling system of the present invention; Figure 5 It is a plan view of the liquid inlet pipeline and the liquid inlet branch in the second embodiment of the direct-cooling energy storage cabinet cooling system of the present invention; Figure 6 It is a plan view of the liquid return pipeline and the liquid return branch in the second embodiment of the direct-cooling energy storage cabinet cooling system of the present invention.

[0031] The reference numerals include: battery compartment 1, battery pack 11, electrical compartment 2, direct cooling unit 21, liquid inlet pipeline 31, liquid inlet branch pipe 32, vertical portion 321, transverse portion 322, liquid separation assembly 4, liquid separator 41, liquid inlet hole 411, liquid separation hole 412, liquid return pipeline 51, liquid return branch pipe 52, limit plate 6, sight glass 7. DETAILED DESCRIPTION

[0032] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0033] In the description of the present application, the terms "first", "second", etc. are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] Embodiment 1: See also Figure 1 As shown, the direct-cooling energy storage cabinet cooling system of this embodiment includes a direct cooling unit 21, a liquid inlet pipeline 31, a liquid separation component 4, multiple liquid inlet branches 32, a liquid return pipeline 51, and multiple liquid return branches 52; the multiple liquid inlet branches 32 correspond to the multiple battery packs 11 one by one, and the refrigerant enters the liquid inlet pipeline 31 through the direct cooling unit 21, and then is divided into the multiple liquid inlet branches 32 through the liquid separation component 4. After passing through the corresponding battery pack 11, it is converged to the liquid return pipeline 51 through the corresponding liquid return branch 52, and finally returns to the direct cooling unit 21.

[0035] Among them, see Figure 4 As shown, the liquid separation component 4 includes a liquid separator 41, the lower end face of the liquid separator 41 is provided with a liquid inlet hole 411 connected to the liquid inlet pipeline 31, and the upper end face of the liquid separator 41 is provided with a plurality of liquid separation holes 412 connected to the liquid inlet hole 411 in a ring around the liquid inlet hole 411; after the refrigerant passes through the liquid inlet hole 411, the refrigerant will flow to the surrounding liquid separation holes 412 in a scattered manner, and the liquid separation holes 412 are arranged in a ring around the liquid inlet hole 411, so that the flow entering each liquid inlet branch pipe 32 is more uniform.

[0036] In this embodiment, due to the nature of the refrigerant itself, the refrigerant is in a two-phase state (gas and liquid exist at the same time) when it flows out of the direct cooling unit 21. In the same section of space in the tube body, the refrigerant in the gas state will be mostly distributed above the space under the influence of gravity. For the horizontally arranged liquid separator, the refrigerant in the gas state will be retained in the upper diversion hole as much as possible. The liquid inlet hole 411 of the liquid separator 41 faces downward and the liquid outlet hole faces upward. The whole is in a vertical state, and the direction of the diversion is set around the vertical center line, so that the refrigerant in the gas state is more evenly distributed in the space.

[0037] Among them, the liquid separation hole 412 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 32; by limiting the aperture ratio of the lower part of the stepped hole and the liquid inlet hole 411, within this ratio range, the refrigerant is more evenly diverted after atomization.

[0038] In this embodiment, when the two-phase refrigerant is directly diverted, since 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 diversion. The two-phase refrigerant in the liquid inlet pipeline 31 enters the liquid separator 41 under the power of the compressor, and the two-phase refrigerant is atomized, which plays a role in fully mixing the gas and liquid phases. Compared with direct diversion, the refrigerant in the atomized state is further diverted, which is more uniform.

[0039] 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 space in the pipeline from the liquid separation 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 the refrigerant flow.

[0040] Among them, see Figure 3 As shown, each of the liquid inlet branch pipes 32 includes a vertical portion 321 and a transverse portion 322. The vertical portion 321 of each of the liquid inlet branch pipes 32 is folded downward 180° according to the height of the corresponding battery pack 11, so that the transverse portion 322 of each of the liquid inlet branch pipes 32 are arranged in parallel; by folding 180°, the height of each vertical portion 321 can be effectively reduced.

[0041] Among them, see Figure 1 As shown, the liquid inlet pipeline 31 and the multiple vertical parts 321 are all located on the same side of the cabinet, and the multiple vertical parts 321 are wrapped with thermal insulation cotton at vertical intervals, and the thermal insulation cotton is engaged in the limiting plate 6 of the cabinet; multiple pipes are arranged on the same side of the cabinet and wrapped with thermal insulation cotton to form a whole bundle, so that the overall space occupied is small and it is convenient to install on the cabinet.

[0042] In this embodiment, the vertical portion 321 is wrapped by thermal insulation cotton, and because the folded vertical portions 321 are in contact with each other, multiple vertical portions 321 are in contact with each other. After the refrigerant is diverted, the pipes in the folded portion will exchange heat with adjacent pipes, thereby better ensuring that the refrigerant temperature in each liquid inlet branch pipe 32 is the same, and the length of each transverse portion 322 is the same. Therefore, although the transverse portion 322 is not wrapped, the time for each section of refrigerant to pass through each transverse portion 322 is the same, thereby ensuring the uniformity of the refrigerant temperature entering each battery pack 11.

[0043] The present invention also discloses an energy storage cabinet, comprising a battery compartment 1, an electrical compartment 2 and the above-mentioned direct-cooling energy storage cabinet cooling system, wherein the electrical compartment 2 is located below the battery compartment 1, a plurality of battery packs 11 are stacked in the battery compartment 1, and a direct cooling unit 21 is located in the electrical compartment 2; by adopting the above-mentioned direct-cooling energy storage cabinet cooling system, when the cooling system is working, the temperature control of each battery pack 11 is more precise.

[0044] Embodiment 2: See also Figure 5 As shown, the direct-cooling energy storage cabinet cooling system of this embodiment is based on the first embodiment. The multiple liquid inlet branch pipes 32 are gradually reduced in diameter from top to bottom, replacing the design of liquid inlet branch pipes 32 with the same length. Without bending the liquid inlet branch pipes 32, for a battery pack 11 with a higher height, the longer the length of the liquid inlet branch pipe 32 is, the greater the flow resistance of the liquid inlet branch pipe 32 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 32, the flow resistance of the liquid inlet pipe at a lower position is increased, thereby ensuring that the flow resistance of the liquid inlet pipe at each height is the same, thereby ensuring the uniformity of the refrigerant flow rate; Wherein, a sight glass 7 is provided on the liquid inlet pipeline 31; by providing the sight glass 7, the internal refrigerant state can be observed without disassembling the pipeline, which is convenient for daily maintenance and inspection.

[0045] Embodiment three: See also Figure 6 As shown, the direct-cooling energy storage cabinet cooling system of this embodiment is based on the first embodiment. A plurality of liquid return branches 52 are arranged in parallel horizontally and correspond to a plurality of battery packs 11 one by one. The liquid return pipeline 51 is vertically arranged in the battery compartment 1 and communicated with each liquid return branch 52. After the refrigerant passes through the battery pack 11, most of it is in gaseous state and needs to be refluxed to the regenerator or compressor. It is no longer necessary to ensure the uniformity of each branch, and it only needs to be converged into one pipeline. Therefore, the above structure is adopted to reduce the total length of the liquid return pipeline 51 and the liquid return branch 52 as much as possible, thereby saving manufacturing costs.

[0046] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A direct-cooling energy storage cabinet cooling system, comprising a liquid inlet pipeline connected to a direct-cooling unit, characterized in that: It also includes a liquid separation component and multiple liquid inlet branches. The liquid separation component diverts the refrigerant in the liquid inlet pipeline to the multiple liquid inlet branches through multiple diversion ports. The multiple liquid inlet branches correspond to the multiple battery packs one by one, and the flow resistance in each liquid inlet branch is the same.

2. The direct cooling energy storage cabinet cooling system according to claim 1 is characterized in that: The liquid separation component comprises a liquid separator, the lower end surface of the liquid separator is provided with a liquid inlet hole connected with a liquid inlet pipeline, and the upper end surface of the liquid separator is provided with a plurality of liquid separation holes connected with the liquid inlet hole in a ring shape around the liquid inlet hole.

3. The direct cooling energy storage cabinet cooling system according to claim 2 is characterized in that: The liquid separation hole is a stepped hole that is larger at the top and smaller at the bottom, 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: The length and diameter of each liquid inlet branch pipe are equal.

5. The direct cooling energy storage cabinet cooling system according to claim 4 is characterized in that: Each of the liquid inlet branch pipes includes a vertical portion and a transverse portion. The vertical portion of each of the liquid inlet branch pipes is bent downward by 180° according to the corresponding battery pack height, and then bent by 90° to form a transverse portion. The length of each of the transverse portions is the same.

6. The direct cooling energy storage cabinet cooling system according to claim 5, characterized in that: The liquid inlet pipeline and the plurality of vertical parts are all located on the same side of the cabinet body, and the plurality of vertical parts are vertically wrapped with thermal insulation cotton at intervals, and the thermal insulation cotton is engaged in the limiting plate of the cabinet body.

7. The direct cooling energy storage cabinet cooling system according to claim 1, characterized in that: The diameters of the multiple liquid inlet branches gradually decrease from top to bottom.

8. The direct cooling energy storage cabinet cooling system according to claim 1, characterized in that: A sight glass is arranged on the liquid inlet pipeline.

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

10. An energy storage cabinet, characterized in that: A direct-cooling energy storage cabinet cooling system according to any one of claims 1 to 9 is used.

Images