Circulating refrigeration immersion liquid cooling energy storage PACK package

Abstract

The utility model discloses a circulating refrigeration immersion liquid cooling energy storage PACK pack in the field of immersion liquid cooling lithium battery PACKs, which comprises at least two PACK pack monomers, at least two plate heat exchangers, at least two oil pumps, a refrigerating unit, a breather valve and an oil storage box, and each PACK pack monomer is provided with a single plate heat exchanger and a single oil pump; the PACK single body is connected with a liquid outlet pipe and a liquid return pipe which are internally communicated, the other end of the liquid outlet pipe is connected with a heat medium inlet of the plate heat exchanger, the other end of the liquid return pipe is connected with a heat medium outlet of the plate heat exchanger, and the oil pump is assembled in the middle of the liquid outlet pipe. The refrigerating unit is connected with a liquid inlet main pipe and a liquid return main pipe, the liquid inlet main pipe is provided with at least two communicated liquid inlet main pipe branches, the other ends of the liquid inlet main pipe branches are connected with liquid cooling medium inlets of different plate heat exchangers, a pressure control switch is arranged in the middle of each liquid inlet main pipe branch, and the liquid return main pipe is provided with at least two communicated liquid return main pipe branches. The other end of the liquid return main pipe branch is connected with liquid cooling medium outlets of different plate heat exchangers, and the cooling effect is achieved through plate heat exchange circulation.

Description

Technical Field

[0001] The utility model relates to the technical field of immersion liquid-cooled lithium battery PACK, in particular to a circulating refrigeration immersion liquid-cooled energy storage PACK bag. Background Art

[0002] A lithium battery PACK is a battery module that uses lithium-ion batteries as a power source and achieves energy storage and release through circuit management and structural optimization. It can directly provide power for various devices, such as consumer electronics such as smartphones, electric bicycles, tablets, and laptops, as well as industrial equipment and other industries that do not require high power capacity. In order to better maintain the use of lithium battery PACKs, they are usually cooled down to operate in a suitable constant temperature environment.

[0003] However, the existing immersion liquid-cooled energy storage systems include whole-cluster cylinder circulation systems and PACK-level whole-cluster oil circulation systems. The cylinder-level oil circulation is difficult to install, has high costs, and is troublesome to maintain. The cluster-level PACK oil circulation also has problems such as excessive pressure in the PACK box, difficulty in sealing, uneven distribution of cold, thermal runaway of the battery cell, and contamination of the entire cluster oil circuit. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technical solutions, the utility model provides a circulating refrigeration immersion liquid-cooled energy storage PACK package, which can effectively solve the technical problem of poor refrigeration and cooling effect of the current immersion liquid-cooled lithium battery PACK.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A circulating refrigeration immersion liquid cooling energy storage PACK package, comprising a PACK package unit, a plate changer, an oil pump, a refrigeration unit, a breathing valve and an oil storage box, wherein the PACK package unit, the plate changer and the oil pump are each provided with at least two, and each PACK package unit is equipped with a single plate changer and an oil pump;

[0007] The PACK monomer is connected with an internally conductive liquid outlet pipe and a liquid return pipe, the other end of the liquid outlet pipe is connected to the heat medium inlet of the plate exchanger, and the other end of the liquid return pipe is connected to the heat medium outlet of the plate exchanger, and the oil pump is installed in the middle of the liquid outlet pipe;

[0008] The refrigeration unit is connected with a liquid inlet main pipe and a liquid return main pipe, the liquid inlet main pipe is provided with at least two conducting liquid inlet main pipe branches, the other end of the liquid inlet main pipe branch is connected to the liquid cooling medium inlet of different plate exchangers, a pressure control switch is provided in the middle of the liquid inlet main pipe branch, the liquid return main pipe is provided with at least two conducting liquid return main pipe branches, the other end of the liquid return main pipe branch is connected to the liquid cooling medium outlet of different plate exchangers.

[0009] Furthermore, the oil storage box is arranged below the breathing valve, and the two are connected with a pressure relief pipe, and the side surface of the PACK package monomer is provided with a pressure relief port connected and communicated with the middle part of the pressure relief pipe.

[0010] Furthermore, a liquid level detection switch is provided in the oil storage box.

[0011] Furthermore, the side of the PACK package unit is provided with a liquid outlet and a liquid return port for inserting a liquid outlet pipe and a liquid return pipe respectively. After the liquid outlet pipe and the liquid return pipe are inserted, they extend to the other end of the PACK package unit, and the liquid return pipe is arranged above the liquid outlet pipe.

[0012] Furthermore, two groups of immersed battery cell modules are arranged in the PACK package monomer, and the liquid outlet pipe and liquid return pipe are arranged between the two battery cell modules after being inserted. The positive electrode interface and negative electrode interface connected to the internal battery cell modules are arranged on the side of the PACK package monomer.

[0013] Furthermore, the side surface of the PACK package unit is also provided with a liquid injection and discharge port and a sampling terminal which are connected to the inside.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] When the PACK monomer releases heat, the internally heated cooling liquid is circulated and transported into the plate exchanger. At the same time, the refrigerant in the refrigeration unit is also circulated and transported into the plate exchanger. The plate exchanger is used to form a heat exchange cycle between the cooling liquid and the refrigerant. The cooled cooling liquid continues to return to the PACK monomer to absorb heat, ensuring that the PACK monomer is in a constant temperature state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structural connection of the utility model;

[0017] Figure 2 This is a schematic diagram of the side structure of a PACK package of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of a PACK package monomer of the utility model;

[0019] Figure 4 This is a schematic diagram of the internal cross-sectional structure of a PACK package monomer of the utility model;

[0020] Numbers in the figure:

[0021] 1-PACK package monomer, 2-plate change, 3-oil pump, 4-refrigeration unit, 5-breathing valve, 6-oil storage box, 7-liquid outlet pipe, 8-liquid return pipe, 9-liquid inlet main pipe, 10-liquid return main pipe, 11-liquid inlet main pipe branch, 12-pressure control switch, 13-liquid return main pipe branch, 14-pressure relief main pipe, 15-pressure relief port, 16-liquid level detection switch, 17-liquid outlet, 18-liquid return port, 19-battery cell module, 20-positive electrode interface, 21-negative electrode interface, 22-liquid injection and discharge port, 23-sampling terminal. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-4 As shown, the utility model provides a circulating refrigeration immersion liquid cooling energy storage PACK package, which is mainly used for power supply of multiple groups of PACK package batteries. When the PACK package battery is powered, the coolant absorbs the heat released when the battery cell is charged and discharged, and the coolant filled in the PACK package battery is circulated and transported, so that the coolant is heat exchanged in the external plate changer 2 to achieve the effect of cooling. Its specific structure mainly includes a PACK package single body 1, a plate changer 2, an oil pump 3, a refrigeration unit 4, a breathing valve 5 and an oil storage box 6, wherein the PACK package single body 1 is a power supply battery, and the refrigeration unit 4 is an external refrigeration device, and the two are heat exchanged through the plate changer 2. Therefore, in terms of configuration, each PACK package single body 1 is paired with a unique plate changer 2 for use.

[0024] In the entire energy storage PACK package, the number of PACK package monomers used for power supply is set to seven, and the IP level of each PACK package monomer 1 chassis reaches IP68 or above, so the number of plate changers 2 and oil pumps 3 connected to the PACK package monomer 1 is also set to seven, and the three are configured and used in a 1:1:1 correspondence. In order to circulate the coolant inside each PACK package monomer 1, each PACK package monomer 1 is inserted with an internally conductive liquid outlet pipe 7 and a liquid return pipe 8. The other end of the liquid outlet pipe 7 is connected to the heat medium inlet of the plate changer 2, and the other end of the liquid return pipe 8 is connected to the heat medium outlet of the plate changer 2, forming a loop in which the coolant circulates repeatedly. In addition, an oil pump 3 is also installed in the middle of the liquid outlet pipe 7, and the oil pump 3 is used to promote the power of the repeated circulation of the coolant.

[0025] When each PACK package monomer 1 is inserted into the liquid outlet pipe 7 and the liquid return pipe 8, a liquid outlet port 17 for inserting the liquid outlet pipe 7 and a liquid return port 18 for inserting the liquid return pipe 8 are provided on the side of the PACK package monomer 1, and the insertion position of the liquid return pipe 8 is arranged above the liquid outlet pipe 7. After the liquid outlet pipe 7 and the liquid return pipe 8 are inserted, they extend together to the other end of the PACK package monomer 1. At the same time, the liquid outlet pipe 7 and the liquid return pipe 8 need to be waterproofed by sealing rings at the connection with the PACK package monomer 1 to prevent leakage.

[0026] Inside the PACK package monomer 1, there are two groups of battery modules 19 distributed on the left and right, and each battery module 19 is composed of multiple battery monomers. At this time, the inserted liquid outlet pipe 7 and liquid return pipe 8 are set between the two battery modules 19. The liquid outlet pipe 7 and the liquid return pipe 8 are both opened with multiple holes for liquid injection and liquid return, and the position of the opening is set between two adjacent battery monomers.

[0027] The side of the PACK package monomer 1 is provided with a positive electrode interface 20 and a negative electrode interface 21 connected to the internal battery module 19. The two battery modules 19 inside each PACK package monomer 1 are connected by aluminum sheets and are mutually conductive, and the positive electrode interface 20 and the negative electrode interface 21 on the side of the PACK package monomer 1 are connected to the outside for power supply.

[0028] The refrigeration unit 4 is connected to a liquid inlet pipe 9 and a liquid return pipe 10 for providing refrigerant flow, forming a water system or a fluorine system structure. In order to better connect with each PACK package monomer 1 for heat exchange, the liquid inlet pipe 9 is provided with seven connected liquid inlet pipe branches 11, and similarly, the liquid return pipe 10 is provided with seven connected liquid return pipe branches 13. At this time, the other ends of the seven liquid inlet pipe branches 11 are connected to the liquid cooling medium inlet ports of different plate exchangers 2, and the other ends of the seven liquid return pipe branches 13 are connected to the liquid cooling medium outlet ports of different plate exchangers 2. At the same time, a pressure control switch 12 is added in the middle of the liquid inlet pipe branch 11, so that each branch can be controlled and used separately, forming a structure of separate cooling or centralized cooling.

[0029] When heat exchange is performed in the plate exchanger 2, the PACK package monomer 1 circulates coolant into the plate exchanger 2, and the refrigeration unit 4 circulates refrigerant into the plate exchanger 2. At this time, the coolant and the refrigerant flow in opposite directions, forming a heat exchange process. The high-temperature input coolant is cooled and then output, and synchronously, the cold-temperature input refrigerant is heated and output, forming a complete refrigeration cycle. In this way, the heat in the PACK package monomer 1 is repeatedly taken away and released, causing the temperature inside the PACK package monomer 1 to rise.

[0030] All PACK monomers 1 are also provided with pressure relief ports 15 on their surfaces. All PACK monomers 1 are connected to the pressure relief main pipe 14 through the corresponding pressure relief ports 15. The pressure relief main pipe 14 is vertically distributed, connected to the breathing valve 5 outside the cabinet at the top, and connected to the oil storage box at the bottom. When the pressure of the pressure relief main pipe 14 reaches the spring pressure in the breathing valve 5, the breathing valve 5 opens to exhaust. When the negative pressure inside the pressure relief main pipe 14 reaches the opening value, the breathing valve 5 opens to inhale. The breathing valve 5 is designed with a filter device to filter out moisture and harmful impurities in the inhaled air to ensure the cleanliness of the air. The bottom of the pressure relief main pipe 14 is connected to an oil storage box 6. The coolant overflowing from the PACK package monomer 1 falls into the oil storage box 6 under the action of gravity to achieve gas-liquid separation. The oil storage box 6 is equipped with a liquid level detection switch 16. When the liquid level reaches a certain level, a liquid level alarm will be issued to remind the operation and maintenance personnel to perform operation and maintenance actions. This ensures that each PACK package monomer 1 is in a normal pressure state and will not cause leakage due to excessive pressure. The oil circuit system of each PACK package monomer 1 is independent to ensure the safety of the system.

[0031] In addition, the side of the PACK package monomer 1 is also provided with a liquid filling and discharge port 22 and a sampling terminal 23 that are connected to the inside. The user can inject or discharge the internal coolant into the PACK package monomer 1 through the liquid filling and discharge port 22, which can be appropriately used to maintain the internal structure. The sampling terminal 23 is used for internal signal acquisition and transmission, circuit debugging and analysis, improving test efficiency, and realizing real-time data monitoring, which is of great significance for ensuring the normal operation and performance optimization of the PACK package monomer 1.

[0032] Compared with the traditional technology, in this technical solution, when the PACK package monomer 1 releases heat, the internal heated coolant circulates and is transported to the plate exchanger 2. At the same time, the refrigerant in the refrigeration unit 4 also circulates and is transported to the plate exchanger 2. The plate exchanger 2 is used to form a heat exchange cycle between the coolant and the refrigerant. The cooled coolant continues to return to the PACK package monomer 1 to absorb heat, ensuring that the PACK package monomer 1 is in a constant temperature state, thereby improving the overall refrigeration effect.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A circulating refrigeration immersion liquid cooling energy storage PACK package, including a PACK package unit, a plate changer, an oil pump, a refrigeration unit, a breathing valve and an oil storage box, characterized in that: The PACK package monomer, plate changer and oil pump are each provided with at least two, and each PACK package monomer is equipped with a single plate changer and oil pump; The PACK monomer is connected with an internally conductive liquid outlet pipe and a liquid return pipe, the other end of the liquid outlet pipe is connected to the heat medium inlet of the plate exchanger, and the other end of the liquid return pipe is connected to the heat medium outlet of the plate exchanger, and the oil pump is installed in the middle of the liquid outlet pipe; The refrigeration unit is connected with a liquid inlet main pipe and a liquid return main pipe, the liquid inlet main pipe is provided with at least two conducting liquid inlet main pipe branches, the other end of the liquid inlet main pipe branch is connected to the liquid cooling medium inlet of different plate exchangers, a pressure control switch is provided in the middle of the liquid inlet main pipe branch, the liquid return main pipe is provided with at least two conducting liquid return main pipe branches, the other end of the liquid return main pipe branch is connected to the liquid cooling medium outlet of different plate exchangers.

2. A circulating refrigeration immersion liquid cooling energy storage PACK according to claim 1, characterized in that: The oil storage box is arranged below the breathing valve, and the two are connected by a pressure relief pipe. The side of the PACK package monomer is provided with a pressure relief port connected and communicated with the middle part of the pressure relief pipe.

3. A circulating refrigeration immersion liquid cooling energy storage PACK according to claim 2, characterized in that: A liquid level detection switch is arranged in the oil storage box.

4. A circulating refrigeration immersion liquid cooling energy storage PACK according to claim 1, characterized in that: The side of the PACK package unit is provided with a liquid outlet and a liquid return port for inserting a liquid outlet pipe and a liquid return pipe respectively. After the liquid outlet pipe and the liquid return pipe are inserted, they extend to the other end of the PACK package unit. The liquid return pipe is arranged above the liquid outlet pipe.

5. A circulating refrigeration immersion liquid cooling energy storage PACK according to claim 4, characterized in that: The PACK package monomer is provided with two groups of immersed battery cell modules distributed on the left and right. The liquid outlet pipe and the liquid return pipe are inserted and arranged between the two battery cell modules. The side of the PACK package monomer is provided with a positive electrode interface and a negative electrode interface connected to the internal battery cell modules.

6. A circulating refrigeration immersion liquid cooling energy storage PACK according to any one of claims 1 to 5, characterized in that: The side surface of the PACK package unit is also provided with a liquid injection and discharge port and a sampling terminal which are connected to the inside.

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