Active circulation immersion liquid cooling battery pack

Abstract

This utility model relates to the field of battery packs, specifically to an active-cycle immersion liquid-cooled battery pack. The active-cycle immersion liquid-cooled battery pack provided by this utility model includes a shell with an internal cavity; a cooling assembly disposed within the cavity; and multiple modules disposed within the cooling assembly. Each module includes multiple battery cells, and a first flow channel is provided between adjacent battery cells. By providing a cooling assembly inside the cavity, the immersion liquid flows in through the inlet, exits through the inlet diversion hole, flows through the manifold, the upper surface of the battery cells, and the first flow channel, and then enters a third flow channel through the return diversion hole and exits. The immersion liquid and each surface of the battery cells can exchange heat to dissipate heat. Simultaneously, the arrangement of the diversion plates minimizes the heat exchange path of the immersion liquid, which helps to improve the heat dissipation rate and reduce the temperature difference along the height of the battery cells.

Description

Technical Field

[0001] This utility model relates to the field of battery packs, and more specifically, to an active cycle immersion liquid-cooled battery pack. Background Technology

[0002] With the increasing demand in the domestic energy storage market and the rapid expansion of the energy storage industry, projects are gradually raising their performance requirements for energy storage systems, such as energy density, integration, and battery consistency. To ensure that the cells within the energy storage system operate within a suitable temperature range, an energy storage thermal management system needs to be designed. Various forms of energy storage thermal management exist, with air cooling and liquid cooling being relatively mature. However, as cell capacity and rate increase, the shortcomings of air cooling systems in terms of heat dissipation efficiency will gradually become apparent. Liquid cooling systems possess stronger heat dissipation capabilities than air cooling systems, improving cooling efficiency and resolving uneven cooling issues. However, the commonly used bottom-mounted liquid cooling plate heat dissipation solution has significant limitations. On one hand, it involves multiple heat transfer stages and has high thermal resistance; on the other hand, the temperature gradient of the cells along the height is large, which affects the lifespan and efficiency of the cells after long-term use and poses significant safety hazards.

[0003] To address these issues, immersion liquid cooling has been introduced in the field of battery cooling technology. Immersion liquid cooling thermal management technology involves direct contact between the energy storage cells and the coolant, completely immersing the battery pack in the insulating coolant. It also utilizes a circulation system and a refrigeration system to use the coolant as a heat dissipation medium to remove the heat generated by the battery in a timely, rapid, and efficient manner, keeping the cells within the optimal temperature range. However, current mainstream immersion cooling technology completely immerses the entire battery in the immersion liquid. Because the immersion liquid remains stationary, the temperature difference between the cells is relatively large when the battery pack is working, which affects the charging and discharging efficiency of the battery pack. Utility Model Content

[0004] To address the technical problem that a large temperature difference between battery cells occurs when the immersion liquid remains stationary, affecting the charging and discharging efficiency of the battery pack, one objective of this invention is to provide an active-cycle immersion liquid-cooled battery pack.

[0005] To achieve the above objectives, embodiments of this utility model provide an active cycle immersion liquid-cooled battery pack, comprising: The shell has an internal cavity for receiving the contents; A cooling component is disposed within the accommodating cavity; Multiple modules are disposed within the cooling assembly. Each module includes multiple battery cells, and a first flow channel is provided between adjacent battery cells.

[0006] In the above technical solution, the battery cell includes two large surfaces and two side surfaces. The large surfaces of two adjacent battery cells in the same module are arranged opposite each other, and a first flow channel is formed between the two adjacent large surfaces.

[0007] In the above technical solution, the cooling component includes: A liquid inlet cooling plate is disposed above the plurality of modules. A second flow channel is formed inside the liquid inlet cooling plate. The liquid inlet cooling plate is provided with at least one liquid inlet and a plurality of liquid inlet diversion holes. The liquid inlet and the liquid inlet diversion holes are both connected to the second flow channel. The plurality of liquid inlet diversion holes are respectively disposed above the plurality of first flow channels. A liquid return cooling plate is disposed below the plurality of modules. A third flow channel is formed in the liquid return cooling plate. The liquid return cooling plate is provided with at least one liquid outlet and a plurality of liquid return diversion holes. The liquid outlet and the liquid return diversion holes are both connected to the third flow channel. The plurality of liquid return diversion holes are respectively disposed below the plurality of first flow channels.

[0008] In the above technical solution, a flow divider plate connected to the large surface is provided in the first flow channel.

[0009] In the above technical solution, the second flow channel includes a first main road and multiple first branch roads. The multiple first branch roads are all connected to the first main road. The first main road is connected to the liquid inlet. Each module is provided with at least two first branch roads above it.

[0010] In the above technical solution, the third flow channel includes a second main channel and multiple second branch channels, all of which are connected to the second main channel, and the second main channel is connected to the liquid outlet.

[0011] In the above technical solution, the cross-sectional area of ​​the liquid inlet diversion hole gradually increases from the inlet of the first branch to the direction away from the inlet of the first branch.

[0012] The above technical solution also includes: An end plate is connected to one end of one of the multiple modules.

[0013] In the above technical solution, an aluminum busbar is provided above the multiple modules, and multiple through holes are opened on the aluminum busbar, with the multiple through holes corresponding to the multiple first flow channels respectively.

[0014] In the above technical solution, the distance between the aluminum plate and the liquid inlet cooling plate is 10cm-20cm.

[0015] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the main sectional view of the present invention; Figure 3 This is a side sectional view of the structure of this utility model; Figure 4 This is a schematic diagram of the liquid inlet cooling plate structure of this utility model; in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1. Housing; 101. Receiving cavity; 2. Module; 201. Battery cell; 3. First flow channel; 4. Liquid inlet cooling plate; 5. Liquid inlet; 6. Liquid inlet diversion hole; 7. Liquid return cooling plate; 8. Liquid outlet; 9. Diversion plate; 10. End plate; 11. Aluminum busbar. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0019] The following reference Figures 1 to 4 This invention describes some embodiments of an active cycle immersion liquid-cooled battery pack.

[0020] like Figures 1 to 4 As shown, an embodiment of this utility model provides an active cycle immersion liquid-cooled battery pack, comprising: The housing 1 has an internal cavity 101; The cooling component is fixedly installed inside the accommodating cavity 101; Multiple modules 2 are disposed within the cooling assembly. Each module 2 includes multiple battery cells 201, and a first flow channel 3 is provided between adjacent battery cells 201.

[0021] When it is necessary to cool down multiple modules 2 inside the cavity 101, the immersion liquid is introduced into the top of the cooling component. The immersion liquid flows downward from the top of the first flow channel 3, so that the immersion liquid can also flow through the outer wall of each cell 201. Then the immersion liquid flows out of the cavity 101 from the bottom of the cooling component, thereby enabling the immersion liquid inside the cavity 101 to circulate. Compared with the problem in the prior art that the temperature difference at different heights of the cell 201 is too large due to the immersion liquid being stationary, which reduces the charging and discharging efficiency of the battery pack, this utility model continuously replaces the immersion liquid to ensure the cooling effect of the cell 201, reduce the temperature difference of the cell 201, and improve the charging and discharging efficiency of the battery pack.

[0022] like Figures 1 to 4 As shown, in one embodiment of the present invention, the battery cell 201 includes two large surfaces and two side surfaces. The large surfaces of two adjacent battery cells 201 within the same module 2 are arranged opposite to each other, and a first flow channel 3 is formed between the two adjacent large surfaces.

[0023] The cooling component includes: A liquid inlet cooling plate 4 is disposed above the plurality of modules 2. The liquid inlet cooling plate 4 is fixedly installed on the inner top of the cavity 101. The liquid inlet cooling plate 4 functions to seal the top of the housing 1. A second flow channel is opened in the liquid inlet cooling plate 4. A liquid inlet 5 is fixedly installed at the edge of the lower surface of the liquid inlet cooling plate 4. A plurality of liquid inlet diversion holes 6 are spaced apart on the lower surface of the liquid inlet cooling plate 4. The liquid inlet 5 and the liquid inlet diversion holes 6 are all connected to the second flow channel. The plurality of liquid inlet diversion holes 6 are respectively disposed above the plurality of first flow channels 3. A return liquid cooling plate 7 is located at the bottom of the cavity 101. A liquid cooling plate is located below the plurality of modules 2. The plurality of modules 2 are placed directly on the return liquid cooling plate 7. A third flow channel is opened in the return liquid cooling plate 7. A liquid outlet 8 is fixedly installed at the edge of the upper surface of the return liquid cooling plate 7. A plurality of return liquid diversion holes are spaced apart on the upper surface of the return liquid cooling plate 7. The liquid outlet 8 and the return liquid diversion holes are all connected to the third flow channel. The plurality of return liquid diversion holes are respectively located below the plurality of first flow channels 3.

[0024] When the immersion liquid is introduced into the cavity 101, the inlet 5 extends outward through the side wall of the housing 1. The external water pump is then connected to the inlet 5. The immersion liquid passes through the inlet 5 and enters the second flow channel. It then flows out from the inlet diversion hole 6. Part of the immersion liquid flowing out from the inlet diversion hole 6 flows directly into the first flow channel 3 and flows downward along the first flow channel 3 to cool the battery cell 201. The other part of the immersion liquid flows from the first flow channel 3 to the upper surface of the battery cell 201. The immersion liquid first contacts the busbar at the top of the battery cell 201 and then flows into the first flow channel 3 from the upper surface of the battery cell 201. This can achieve all-round cooling of the battery cell 201 and improve the cooling effect of the immersion liquid on the battery cell 201.

[0025] When the immersion liquid flows to the bottom of the first flow channel 3, it will pass through the return flow hole and then enter the third flow channel. After the third flow channel is filled with immersion liquid, it will be discharged outward through the outlet 8. The outlet 8 is connected to the water pump outside the housing 1. After the immersion liquid is discharged to the designated location, since the immersion liquid absorbs the heat of the battery cell 201, it is necessary to cool down the discharged immersion liquid. Then the cooled immersion liquid will be recycled.

[0026] In addition, when the immersion liquid flows downward from the upper surface of the cell 201, since there is also a gap between the two adjacent modules 2, the immersion liquid can also flow downward from the side of the cell 201, which will carry the heat on the side of the cell 201. Finally, the immersion liquid will gather on the upper surface of the return liquid cooling plate 7 and finally enter the third flow channel through the return liquid diversion hole.

[0027] The water pump's operating mode is combined with the temperature of the 201 battery cell to design a suitable operating strategy. It can start working when the 201 battery cell reaches a certain temperature, or the water pump can adopt a pulse-type operating mode.

[0028] Through the above-described cooling process of cell 201, the cell 201 can be continuously cooled, and the temperature difference of cell 201 can be reduced, thereby improving the charging and discharging efficiency of the battery pack.

[0029] like Figures 1 to 3 As shown, in one embodiment of this utility model, the first flow channel 3 is provided with a flow divider 9 connected to the large surface.

[0030] By installing multiple diverter plates 9 fixedly connected to the large surface within the first flow channel 3, and ensuring that the thickness of each diverter plate 9 is the same as the distance between adjacent large surfaces, the diverter plates 9 guarantee that the distance between adjacent cells 201 within the same module 2 remains constant during installation. Furthermore, by setting multiple diverter plates 9 made of insulating material and arranging them in designated locations according to actual usage requirements, the trajectory of the immersion liquid flowing through the first flow channel 3 can be controlled, forming a reasonable cooling channel. The cooling channel within the first flow channel 3 not only guides the flow and ensures uniform heat dissipation, but also forms flow channel isolation between cells 201 while maintaining the structural strength of the module 2. If a cell 201 experiences overheating or even thermal runaway, the flowing coolant can provide thermal isolation, effectively curbing heat diffusion and achieving efficient and uniform heat dissipation while improving the safety of the battery pack.

[0031] Guide plates are arranged at the top and bottom of the large surface of each cell 201, and are evenly distributed at the top and bottom, linearly arranged along the width direction of the cell 201. This structural arrangement allows the immersion liquid to enter the large surface flow channel from the top and sides of the cell 201.

[0032] like Figures 1 to 4 As shown, in one embodiment of the present invention, the second flow channel includes a first main channel and multiple first branch channels. The multiple first branch channels are all connected to the first main channel. The first main channel is connected to the liquid inlet 5. At least two first branch channels are provided above each module 2.

[0033] The third flow channel includes a second main channel and multiple second branch channels, all of which are connected to the second main channel, and the second main channel is connected to the liquid outlet 8.

[0034] The second and third flow channels are formed using a stamping process. The second flow channel includes a first main channel and multiple first branch channels, while the third flow channel includes a second main channel and multiple second branch channels. The second and third flow channels employ a parallel design with multiple branch channels, which effectively reduces flow resistance and improves the consistency of flow rates between the inlet and outlet channels. The specific arrangement of the first main channel, first branch channel, second main channel, and second branch channel is determined based on actual usage requirements.

[0035] like Figure 4 As shown, in one embodiment of this utility model, the cross-sectional area of ​​the liquid inlet diversion hole 6 gradually increases from the inlet of the first branch towards the direction away from the inlet of the first branch.

[0036] The cross-sectional area of ​​the liquid inlet diversion hole 6 gradually increases from the inlet of the first branch to the direction away from the inlet of the first branch. This ensures that most of the immersion liquid will not be discharged from the liquid inlet diversion hole 6 that is in contact with the immersion liquid first. This ensures that each liquid inlet diversion hole 6 has immersion liquid discharged, so that the immersion liquid can uniformly cool each cell 201.

[0037] like Figure 1 As shown, in one embodiment of the present invention, an end plate 10 is also included, which is connected to one end of the plurality of modules 2.

[0038] By providing an end plate 10 on the same side of multiple modules 2, and fixing multiple modules 2 to the end plate 10, the distance between each module 2 can be controlled to be the same and each module 2 can be fixed to prevent the modules 2 from shifting.

[0039] like Figures 1 to 3 As shown, in one embodiment of this utility model, an aluminum strip 11 is provided above the plurality of modules 2. The aluminum strip 11 is fixedly connected to the inner wall of the cavity 101. The aluminum strip 11 has a plurality of through holes, and the plurality of through holes correspond to the plurality of first flow channels 3 respectively.

[0040] The distance between the aluminum plate and the liquid inlet cooling plate 4 is 10cm-20cm.

[0041] The top of the battery cell 201 is provided with an aluminum busbar 11 fixedly connected to the inner wall of the cavity 101. The distance between the upper end face of the aluminum busbar 11 and the upper liquid cooling plate is 10cm-20cm. When a battery cell 201 experiences thermal runaway, the pressure is released through the air 10cm-20cm above and the pressure relief valve.

[0042] During the entire operation of the device, the immersion liquid ejected from the liquid inlet diversion hole 6 will pass through the through hole and enter the first flow channel 3.

[0043] This utility model has the following advantages: 1. After the immersion liquid flows in through the inlet 5, it flows out through the inlet diversion hole 6, passes through the manifold, the upper surface of the battery cell 201 and the first flow channel 3, and then enters the third flow channel through the return diversion hole and flows out. The immersion liquid and each surface of the battery cell 201 can exchange heat to remove heat. At the same time, the arrangement of the diversion plate 9 makes the heat exchange path of the immersion liquid the shortest, which is conducive to improving the heat dissipation rate and reducing the temperature difference in the height direction of the battery cell 201.

[0044] 2. By using a multi-branch parallel system, the inlet liquid cooling plate 4 and the return liquid cooling plate 7 are connected in parallel through multiple branches, reducing the system flow resistance and improving the flow consistency of each branch. In addition, the overall immersion liquid heat exchange path composed of multiple first flow channels 3, second flow channels and third flow channels inside the cavity 101 also adopts a multi-branch parallel connection, so that the immersion liquid can flow through the outer wall of each cell 201 at the same time, carrying away the heat of the cell 201 and reducing the temperature difference in the height direction of the cell 201.

[0045] 3. Compared with the indirect heat dissipation method of traditional liquid cooling plates and other immersion heat dissipation methods, the heat dissipation method of the present invention can make the insulating coolant directly contact each surface of the battery cell 201, and remove heat quickly and efficiently through the flow of immersion liquid, which greatly reduces the thermal resistance between the coolant and the heat source and improves the heat dissipation efficiency.

[0046] 4. By controlling the size and arrangement of the openings on the lower end face of the liquid cooling plate 4, the flow rate of the coolant flowing through each cell 201 can be basically balanced, which can control the temperature difference between the cells 201 to a large extent.

[0047] 5. The liquid inlet cooling plate 4 and the liquid return cooling plate 7 can use the same mold. The only difference is the shape, number and position of the diversion holes on the end face, which can save a lot of component costs.

[0048] 6. Since the present invention is a fully submerged battery pack, the battery cell 201 is completely submerged in the insulating coolant, which can replace the battery pack-level fire protection system to a certain extent. In the event of thermal runaway of the battery cell 201, the submerged liquid and the battery cell 201 are in direct contact, which can quickly remove heat. At the same time, the flowing submerged liquid between the battery cells 201 forms an isolation zone, which can effectively prevent the spread of heat.

[0049] In this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0050] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An actively circulating immersion liquid-cooled battery pack, characterized by, include: The shell has an internal cavity for receiving the contents; A cooling component is disposed within the accommodating cavity; Multiple modules are disposed within the cooling assembly. Each module includes multiple battery cells, and a first flow channel is provided between adjacent battery cells.

2. The active cycle immersion liquid-cooled battery pack according to claim 1, characterized in that, The battery cell includes two large surfaces and two side surfaces. The large surfaces of two adjacent battery cells in the same module are arranged opposite each other, and a first flow channel is formed between the two adjacent large surfaces.

3. The active cycle immersion liquid-cooled battery pack according to claim 2, characterized in that, The cooling component includes: A liquid inlet cooling plate is disposed above the plurality of modules. A second flow channel is formed inside the liquid inlet cooling plate. The liquid inlet cooling plate is provided with at least one liquid inlet and a plurality of liquid inlet diversion holes. The liquid inlet and the liquid inlet diversion holes are both connected to the second flow channel. The plurality of liquid inlet diversion holes are respectively disposed above the plurality of first flow channels. A liquid return cooling plate is disposed below the plurality of modules. A third flow channel is formed in the liquid return cooling plate. The liquid return cooling plate is provided with at least one liquid outlet and a plurality of liquid return diversion holes. The liquid outlet and the liquid return diversion holes are both connected to the third flow channel. The plurality of liquid return diversion holes are respectively disposed below the plurality of first flow channels.

4. The active cycle immersion liquid-cooled battery pack according to claim 3, characterized in that, The first flow channel is provided with a flow divider plate connected to the large surface.

5. The active cycle immersion liquid-cooled battery pack according to claim 4, characterized in that, The second flow channel includes a first main channel and multiple first branch channels. The multiple first branch channels are all connected to the first main channel. The first main channel is connected to the liquid inlet. Each module has at least two first branch channels above it.

6. The active cycle immersion liquid-cooled battery pack according to claim 5, characterized in that, The third flow channel includes a second main channel and multiple second branch channels, all of which are connected to the second main channel, and the second main channel is connected to the liquid outlet.

7. The active cycle immersion liquid-cooled battery pack according to claim 6, characterized in that, The cross-sectional area of ​​the liquid inlet diversion hole gradually increases from the inlet of the first branch towards the direction away from the inlet of the first branch.

8. The active circulating immersion liquid-cooled battery pack of claim 7, wherein, Also includes: An end plate is connected to one end of one of the multiple modules.

9. The active cycle immersion liquid-cooled battery pack according to claim 8, characterized in that, An aluminum busbar is provided above the multiple modules, and multiple through holes are provided on the aluminum busbar, each of which corresponds to a multiple first flow channel.

10. The active cycle immersion liquid-cooled battery pack according to claim 9, characterized in that, The distance between the aluminum busbar and the liquid inlet cooling plate is 10cm-20cm.

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