Full-immersion liquid-cooled battery pack

Abstract

The utility model discloses a full-immersion liquid-cooled battery pack, which relates to the technical field of energy storage batteries, and comprises a shell and a battery module, the battery module is arranged in the shell, a first cooling medium for immersing the battery module is also arranged in the shell, the battery module comprises a plurality of battery cell units, gaps are arranged among the battery cell units, and the battery cell units are arranged in the shell. A heat dissipation frame is further arranged in the shell, the heat dissipation frame comprises a collecting pipe and a heat dissipation pipe which are communicated with each other in a sealed mode, the heat dissipation pipe is arranged in a snake shape around the periphery of the battery module and gaps between the battery cell units, a plurality of liquid circulation channels are arranged in the heat dissipation frame, and second cooling media are arranged in the liquid circulation channels; and the second cooling medium flows in the liquid flowing channel. The battery pack has the beneficial effects that the heat dissipation effect of the battery pack is improved by arranging the snakelike heat dissipation pipes at the peripheries of the battery modules and in the gaps among the battery cell units; the second cooling medium is set as the refrigerant of the external refrigeration device, so that the heat exchange step is reduced, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, in particular to a fully immersed liquid-cooled battery pack. Background Art

[0002] Lithium batteries are favored by industries such as 3C digital, power tools, electric bicycles and new energy vehicles due to their high energy density, high voltage, environmental protection, long life and fast charging. Their contribution to the new energy vehicle industry is particularly outstanding.

[0003] The battery pack of the prior art mainly adopts two cooling methods including air cooling and liquid cooling. The cooling medium of the air-cooled battery pack is air, which has a low energy efficiency ratio, and the air-cooled equipment occupies a large area, resulting in low capacity density and indirect liquid cooling. The components do not directly contact the coolant, but conduct heat through an aluminum (or other metal) cold plate filled with coolant. The contact area between the battery cell and the cold plate is small, and heat needs to be transferred through a thermally conductive insulating material. The heat conduction is slow, and single-sided cooling has problems such as uneven temperature and poor heat dissipation effect. The liquid-cooled battery pack immerses the battery module in the cooling medium. The difference between it and the air-cooled battery pack is that the cooling medium is replaced from air to a cooling medium with higher thermal conductivity and better heat dissipation performance. However, it usually absorbs the heat of the battery module by the first cooling medium, and then exchanges the heat to the second cooling medium, and then cools the second cooling medium through a heat exchange device. The number of heat exchanges is large, the energy loss is serious, and the energy consumption of the entire device is high and the structure is complex.

[0004] Therefore, it is necessary to design a fully immersed battery pack with a simple battery module structure and better heat dissipation effect. Utility Model Content

[0005] In order to solve one of the above-mentioned defects of the prior art, the present application provides a fully immersed liquid-cooled battery pack, which can reduce the temperature inside the battery module more quickly.

[0006] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0007] A fully submerged liquid-cooled battery pack includes a shell and a battery module, wherein the battery module is arranged inside the shell, and a first cooling medium for immersing the battery module is also arranged inside the shell, wherein the battery module includes a plurality of battery cells, and gaps are arranged between the battery cells. A heat sink is also arranged inside the shell, and the heat sink includes a current collector and a heat dissipation pipe that are sealed and connected to each other, and the heat dissipation pipe is arranged in a serpentine shape around the periphery of the battery module and the gaps between the battery cells. A plurality of liquid circulation channels are arranged inside the heat sink, and a second cooling medium is arranged in the liquid circulation channel, and the second cooling medium flows in the liquid circulation channel. By arranging serpentine heat dissipation pipes around the periphery of the battery module and the gaps between the battery cells, the heat generated by the battery module is quickly transferred to the second cooling medium, and the heat is exchanged to the outside through the second cooling medium, so as to improve the heat dissipation effect of the battery pack.

[0008] Optionally, the manifold is provided with an inlet and an outlet for the second cooling medium to flow into and out of the heat sink, and the inlet and the outlet pass through the shell. The second cooling medium circulates with the outside through the inlet and the outlet provided on the manifold.

[0009] Optionally, the liquid inlet and the liquid outlet are both connected to a refrigeration device pipeline outside the battery pack.

[0010] Optionally, the second cooling medium is set as the refrigerant of the refrigeration device. The second cooling medium is set as the refrigerant of the external refrigeration device to reduce the heat exchange steps, and the refrigerant of the refrigeration device is used to directly cool the battery pack.

[0011] Optionally, the first cooling medium is set to be one of fluorinated liquid, silicone oil, and mineral oil.

[0012] Optionally, the cross section of the heat dissipation pipe is set to a flat structure, and its left and right sides are set to flat surfaces, and the flat surfaces are in contact with the sides of the battery cell unit. Setting the cross section of the heat dissipation pipe to a flat structure and in contact with the sides of the battery cell unit further enhances the heat dissipation effect.

[0013] Optionally, the plurality of liquid circulation channels are evenly arranged in the vertical direction inside the heat dissipation pipe and are arranged parallel to each other.

[0014] Optionally, the manifold is provided with a first cavity connecting the liquid inlet and each liquid circulation channel, and a second cavity connecting the liquid outlet and each liquid circulation channel. By providing the first cavity and the second cavity at both ends of the liquid circulation channel, the transportation of the second cooling medium is facilitated.

[0015] Optionally, the housing includes side panels located around the housing, the upper and lower sides of the side panels are respectively connected to the top panel and the bottom panel, and sealing rings are provided at the connection between the side panels and the top panel and at the connection between the side panels and the bottom panel. The interior of the housing is sealed by providing the sealing rings.

[0016] Optionally, the top plate is provided with a liquid injection port for injecting the first cooling medium into the shell, and an exhaust port for exhausting the air inside the shell during liquid injection. The liquid injection port and the exhaust port are provided to facilitate injecting the first cooling medium into the shell.

[0017] The beneficial effects of the utility model are as follows: the heat dissipation effect of the battery pack is improved by arranging serpentine heat dissipation tubes at the periphery of the battery module and in the gaps between the battery cell units; the heat exchange steps are reduced by setting the second cooling medium as the refrigerant of an external refrigeration device, and the refrigerant of the refrigeration device is used to directly cool the battery pack, thereby reducing the number of heat exchanges, simplifying the structure, and saving costs.

[0018] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be detailed in conjunction with the drawings, but it is not a limitation of the technical solution of the present invention. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 is a schematic diagram of the exploded structure of the battery pack of this embodiment;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the heat dissipation frame of this embodiment;

[0022] Figure 3 This is a right view of the combined state of the heat dissipation frame and the battery module of this embodiment;

[0023] Figure 4 yes Figure 3 Schematic diagram of the AA direction cross section.

[0024] Among them, 10, shell; 11, side plate; 12, top plate; 20, battery module; 21, battery cell unit; 30, heat sink; 31, collecting pipe; 32, heat dissipation pipe; 311, liquid inlet; 312, liquid outlet; 321 liquid flow channel. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0026] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0027] Example:

[0028] like Figure 1 , Figure 3 As shown, a fully immersed liquid-cooled battery pack includes a shell 10 and a battery module 20, wherein the battery module 20 is arranged inside the shell 10, and a first cooling medium for immersing the battery module 20 is also arranged inside the shell 10, and the battery module 20 includes a plurality of battery cell units 21, wherein the battery cell units 21 are formed by an arrangement and combination of a plurality of battery cells, and gaps are arranged between the battery cell units 21, and a heat dissipation rack 30 is also arranged inside the shell 10, wherein the heat dissipation rack 30 includes a collector 31 and a heat dissipation pipe 32 which are sealed and connected to each other, and the heat dissipation pipe 32 is arranged in a serpentine shape around the periphery of the battery module 20 and the gaps between the battery cell units 21, and a plurality of liquid circulation channels 321 are arranged inside the heat dissipation rack 30, and a second cooling medium is arranged in the liquid circulation channels 321, and the second cooling medium flows in the liquid circulation channels 321.

[0029] The above embodiment sets a heat sink 30 including a serpentine heat pipe 32 at the periphery of the battery module 20 and in the gap between the battery cells 21, so that the heat generated by the battery module 20 is quickly transferred to the second cooling medium in the serpentine heat pipe 32, and the heat is exchanged to the outside through the second cooling medium to improve the heat dissipation effect of the battery pack. The heat pipe 32 is set at the periphery of the battery module 20 and in the gap between the battery cells 21, forming a relative positional relationship of nested setting with the battery module 20, so that the heat generated by the battery module 20 can be quickly transferred to the heat pipe 32, with good heat dissipation effect, effectively solving the problem of uneven heat dissipation and poor heat dissipation effect of the battery pack in the prior art.

[0030] As a way to achieve this, Figure 2As shown, the manifold 31 is provided with a liquid inlet 311 and a liquid outlet 312 for the second cooling medium to flow into and out of the heat sink 30, and the liquid inlet 311 and the liquid outlet 312 pass through the shell 10. The second cooling medium is circulated with the outside through the liquid inlet 311 and the liquid outlet 312 provided on the manifold 31, and the liquid inlet 311 and the liquid outlet 312 pass through the shell 10 to facilitate communication with external equipment.

[0031] As an implementation method, the liquid inlet 311 and the liquid outlet 312 are both connected to the refrigeration device pipeline outside the battery pack. The refrigeration device outside the battery pack is connected through the liquid inlet 311 and the liquid outlet 312 pipeline, so that the refrigeration device can input the cooling medium into the liquid circulation channel 321 in the heat dissipation pipe 32, thereby realizing the cooling of the battery module 20 by the refrigeration device.

[0032] As an implementation, the second cooling medium is set as the refrigerant of the refrigeration device. The second cooling medium is set as the refrigerant of the external refrigeration device to reduce the heat exchange steps, and the refrigerant of the refrigeration device is used as the second cooling medium circulated inside the heat dissipation frame 30, and the battery pack is directly cooled and cooled by the refrigerant. The refrigeration device includes a compressor, a condenser and a throttling device connected to each other by pipes, and a refrigerant is arranged in the connecting pipes of the three. The refrigerant is usually R134A (1,1,1,2-tetrafluoroethane) or R410A (new environmentally friendly refrigerant). In the prior art, a heat exchange device is used to isolate the refrigeration device and the heat dissipation device, and the second cooling medium of the heat dissipation device is cooled by the refrigeration device. After the second cooling medium exchanges heat with the first cooling medium, the heat generated by the battery module 20 is absorbed by the first cooling medium. In this implementation, the refrigerant flowing out of the throttling device is directly transported to the liquid circulation channel 321 of the heat dissipation pipe 32 to cool the battery module 20. Compared with the prior art, the heat exchange steps are reduced, the energy loss is reduced, and the heat dissipation effect can be improved.

[0033] As an implementation method, the first cooling medium is set to one of fluorinated liquid, silicone oil, and mineral oil. Fluorinated liquid, silicone oil, mineral oil and other liquids have high specific heat capacity and heat transfer coefficient, and can more effectively take away the heat generated by the battery module 20 compared to commonly used cooling media such as air or water. In addition, fluorinated liquid, silicone oil, mineral oil and other liquids have high dielectric strength and dielectric constant, and can better protect the battery module 20 from the risk of electric shock or short circuit compared to cooling media with strong conductivity such as water, thereby improving the safety of the liquid-cooled battery pack.

[0034] As a way to achieve this, Figure 3 , 4As shown, the cross section of the heat dissipation pipe 32 is set to a flat structure, and its left and right sides are set to flat surfaces, and the flat surfaces are in contact with the sides of the battery cell unit 21. Setting the cross section of the heat dissipation pipe 32 to a flat structure and in contact with the sides of the battery cell unit 21 further enhances the heat dissipation effect. Setting the cross section of the heat dissipation pipe 32 to a flat structure and setting its left and right sides to flat surfaces allows the heat dissipation pipe 32 to be more tightly connected to the battery cell unit 21 of the battery module 20, so that the second cooling medium in the heat dissipation pipe 32 can absorb the heat generated by the battery module 20 more quickly.

[0035] As a way to achieve this, Figure 4 As shown, the plurality of liquid circulation channels 321 are evenly arranged in the vertical direction and are arranged in parallel with each other in the heat dissipation tube 32. By evenly arranging the liquid circulation channels 321 in the vertical direction and being arranged in parallel with each other in the heat dissipation tube 32, the tube wall of the heat dissipation tube 32 can be set thinner, making the overall structure more compact and facilitating the conduction of heat energy.

[0036] As an implementation mode, the manifold 31 is provided with a first cavity communicating with the liquid inlet 311 and each liquid circulation channel 321, and a second cavity communicating with the liquid outlet 312 and each liquid circulation channel 321. By providing the first cavity and the second cavity at both ends of the liquid circulation channel 321, the transportation of the second cooling medium is facilitated.

[0037] As an implementation, the shell 10 includes side panels 11 located around, and the upper and lower sides of the side panels 11 are connected to the top panel 12 and the bottom panel, and the connection between the side panels 11 and the top panel 12 and the connection between the side panels 11 and the bottom panel are provided with sealing rings, and the side panels 11 and the top panel 12 and the bottom panel are all fixedly connected by threads. The inside of the shell 10 is sealed by providing sealing rings at the connection between the side panels 11, the top panel 12 and the bottom panel. In this embodiment, the side panels 11 and the bottom panel are set as an integral connection structure, the side panels 11 and the top panel 12 are connected by threads, and sealing rings are provided at the connection between the side panels 11 and the top panel 12, so as to reduce the use of connecting parts and increase the sealing of the shell 10, and prevent the first cooling medium inside the shell 10 from leaking. In other embodiments, the side panels 11 and the top panel 12 can also be set as an integral connection structure, and the side panels 11 and the bottom panel are connected by threads to achieve the same effect as the implementation of this embodiment.

[0038] As an implementation method, the top plate 12 is provided with a liquid injection port for injecting the first cooling medium into the shell 10, and an exhaust port for exhausting the air inside the shell 10 during liquid injection. The liquid injection port and the exhaust port are provided to facilitate the injection of the first cooling medium into the shell 10, and the liquid injection port is provided on the top plate 12 to facilitate the liquid injection operation. At the same time, the exhaust port is provided on the top plate 12 to exhaust the air in the battery pack while injecting the liquid to ensure smooth liquid injection operation.

[0039] In summary, this embodiment sets a heat sink 30 including a serpentine heat pipe 32 at the periphery of the battery module 20 and in the gap between the battery cell units 21, so that the heat generated by the battery module 20 is quickly transferred to the second cooling medium in the serpentine heat pipe 32, and the heat is exchanged to the outside through the second cooling medium to improve the heat dissipation effect of the battery pack. The heat pipe 32 is set at the periphery of the battery module 20 and in the gap between the battery cell units 21, and forms a nested relative position relationship with the battery module 20, so that the heat generated by the battery module 20 can be quickly transferred to the heat pipe 32, with good heat dissipation effect, effectively solving the problem of uneven heat dissipation and poor heat dissipation effect of the battery pack in the prior art; by directly conveying the refrigerant flowing out of the throttling device to the liquid flow channel 321 of the heat pipe 32 to cool the battery module 20, the problem of many heat exchange times and large energy loss in the heat dissipation process of the battery pack in the prior art is solved, effectively reducing the heat exchange steps, reducing energy loss and improving the heat dissipation effect.

[0040] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A fully submerged liquid-cooled battery pack, comprising a housing and a battery module, wherein the battery module is arranged inside the housing, and a first cooling medium for submerging the battery module is also arranged inside the housing, wherein the battery module comprises a plurality of battery cell units, characterized in that: Gaps are arranged between the battery cell units, and a heat sink is also arranged in the shell. The heat sink includes a collecting pipe and a heat dissipation pipe which are sealed and connected to each other. The heat dissipation pipe is arranged in a serpentine shape around the periphery of the battery module and the gaps between the battery cell units. A plurality of liquid circulation channels are arranged inside the heat sink, and a second cooling medium is arranged in the liquid circulation channels, and the second cooling medium flows in the liquid circulation channels.

2. The fully submerged liquid-cooled battery pack according to claim 1, characterized in that: The collecting pipe is provided with a liquid inlet and a liquid outlet for the second cooling medium to flow into and out of the heat sink, and the liquid inlet and the liquid outlet pass through the shell.

3. The fully submerged liquid-cooled battery pack according to claim 2, characterized in that: The liquid inlet and the liquid outlet are both connected to a refrigeration device pipeline outside the battery pack.

4. The fully submerged liquid-cooled battery pack according to claim 3, characterized in that: The second cooling medium is configured as a refrigerant of the refrigeration device.

5. The fully submerged liquid-cooled battery pack according to claim 1, characterized in that: The first cooling medium is set to be one of fluorinated liquid, silicone oil, and mineral oil.

6. The fully submerged liquid-cooled battery pack according to claim 1, characterized in that: The cross section of the heat dissipation pipe is set as a flat structure, and the left and right side surfaces thereof are set as flat surfaces, and the flat surfaces are in contact with the side surfaces of the battery cell unit.

7. The fully submerged liquid-cooled battery pack according to claim 6, characterized in that: The plurality of liquid flow channels are evenly arranged in the heat dissipation tube along the vertical direction and are arranged parallel to each other.

8. The fully submerged liquid-cooled battery pack according to claim 2, characterized in that: The manifold is provided with a first cavity communicating with the liquid inlet and each liquid circulation channel, and a second cavity communicating with the liquid outlet and each liquid circulation channel.

9. The fully submerged liquid-cooled battery pack according to claim 1, characterized in that: The shell comprises side plates arranged around the shell, the upper and lower sides of the side plates are respectively connected with a top plate and a bottom plate, and sealing rings are arranged at the connection between the side plates and the top plate and at the connection between the side plates and the bottom plate.

10. The fully submerged liquid-cooled battery pack according to claim 9, characterized in that: The top plate is provided with a liquid injection port for injecting the first cooling medium into the shell, and an exhaust port for exhausting the air inside the shell during liquid injection.

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