An immersion liquid cooling device and an energy storage battery pack with the same

Abstract

This utility model discloses an immersion liquid cooling device and an energy storage battery pack incorporating therein. The immersion liquid cooling device has an immersion chamber filled with an immersion liquid to immerse and dissipate heat from a component housed therein. The immersion liquid cooling device includes a cooling plate disposed within the immersion chamber, the cooling plate having cooling channels disposed therein, the cooling channels being connected to an inlet and an outlet. The inlet and outlet are connected to the outside of the immersion chamber for refrigerant input and output through the cooling channels. The cooling channels are not interconnected with the immersion chamber; the refrigerant exchanges heat with the immersion liquid and / or the component to be cooled in the immersion chamber through the cooling plate. The immersion liquid cooling device and energy storage battery pack incorporating therein provided by this utility model can improve overall heat dissipation performance and overall temperature control stability, preventing the risk of localized overheating.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling technology, specifically to an immersion liquid cooling device and an energy storage battery pack having the same. Background Technology

[0002] Currently, the main cooling methods for energy storage batteries are air cooling and plate cooling. Air cooling uses a high-power fan, heat dissipation ducts, and finned structures to achieve heat dissipation, while plate cooling mainly consists of a liquid cooling plate, a circulating pump set, a control system, and piping, forming a sealed coolant circulation system. Heat is dissipated through indirect contact between the coolant and the energy storage battery. Air cooling has disadvantages such as low heat dissipation efficiency, poor overall heat dissipation, and high noise. In comparison, plate cooling has more advantages in cooling energy storage batteries.

[0003] Cold plate cooling involves attaching a cold plate to the surface of the battery module. The coolant circulating inside the liquid cooling plate absorbs the heat generated by the battery, which is then dissipated through an external heat exchange system. However, with the increase in battery energy density and the growing demand for fast charging, traditional cold plate cooling has the following drawbacks: Thermally conductive adhesive or gaskets are required between the liquid cooling plate and the battery module to reduce contact thermal resistance. However, after long-term use, material aging and uneven contact surfaces can lead to decreased thermal conductivity, and it is difficult to achieve precise temperature control between individual battery cells, resulting in a significant risk of localized overheating. Furthermore, the liquid cooling plate can only transfer heat through one side or localized contact, resulting in poor heat dissipation for parts of the battery module far from the liquid cooling plate. This leads to a delayed response to the heat dissipation needs of high-power-density batteries, increasing the risk of thermal runaway.

[0004] Therefore, it is necessary to propose a new technical solution to overcome the shortcomings of existing technologies. Utility Model Content

[0005] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides an immersion liquid cooling device and an energy storage battery pack incorporating it, which can improve overall heat dissipation performance and overall temperature control stability, preventing the risk of localized overheating.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an immersion liquid cooling device having an immersion chamber, the immersion chamber being filled with immersion liquid to immerse and dissipate heat from a component housed therein, the immersion liquid cooling device including a cooling plate disposed within the immersion chamber, the cooling plate having a cooling channel disposed therein, the cooling channel being connected to an inlet and an outlet, the inlet and outlet being connected to the outside of the immersion chamber for refrigerant input and output from the cooling channel, wherein the cooling channel is not connected to the immersion chamber, and the refrigerant contacts the immersion liquid and / or the component to be cooled in the immersion chamber through the cooling plate for heat exchange.

[0007] Optionally, the cooling plate includes at least a base plate portion located below the component to be cooled, and the immersion liquid cooling device includes a baffle disposed near the upper part of the component to be cooled, the baffle being configured to obtain immersion liquid from a position near the base plate portion and disperse it to the upper part of the component to be cooled.

[0008] Optionally, the spoiler includes multiple spoiler tubes, and the spoiler tubes are provided with multiple injection holes.

[0009] Optionally, one end of the turbulence pipe is connected to a turbulence pump located near the bottom plate, so as to draw immersion liquid through the turbulence pump and deliver it to the turbulence pipe.

[0010] Optionally, the immersion liquid cooling device includes an inlet manifold for inputting refrigerant into the cooling channel and an outlet manifold for collecting refrigerant flowing out of the cooling channel, with the turbulence pump located close to the inlet manifold.

[0011] Optionally, the cooling plates are multiple plates arranged in parallel, or the cooling plates include multiple flow channel areas arranged in parallel; wherein the liquid inlet manifold and the liquid outlet manifold are respectively connected to the multiple cooling plates or the multiple flow channel areas.

[0012] Optionally, the cooling plate includes a base plate portion and a side plate portion extending upward from the base plate portion. The cooling channels are provided in both the base plate portion and the side plate portion, and the side plate portion extends into the gap between two adjacent heat dissipation components.

[0013] Optionally, the cooling plate is a phase change direct cooling plate.

[0014] Optionally, the immersion liquid cooling device includes a housing that surrounds the immersion cavity, and the immersion liquid cooling device further includes a plurality of support members disposed on the housing, the support members being used to support the component to be cooled in order to bear the pressure of the component to be cooled.

[0015] The present invention also adopts the following technical solution: an energy storage battery pack, including a battery module and an immersion liquid cooling device as described above, wherein the battery module is disposed in the immersion cavity so that it is cooled by the cooling plate and the immersion liquid.

[0016] The immersion liquid cooling device provided by this utility model dissipates heat by immersing the component to be cooled in an immersion liquid. A cooling plate is installed in the immersion chamber, and the refrigerant flows in the cooling channels within the cooling plate. The cooling channels are not connected to the immersion chamber. The refrigerant exchanges heat with the immersion liquid and / or the component to be cooled in the immersion chamber through the cooling plate. This arrangement achieves omnidirectional heat dissipation through immersion liquid cooling, avoiding the risk of local overheating. Furthermore, the contact between the cooling plate and the immersion liquid and / or the component to be cooled enables effective overall temperature control of the immersion liquid and the component to be cooled, improving the overall heat dissipation performance and the stability of overall temperature control.

[0017] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a perspective view showing the interior of an embodiment of the energy storage battery pack of this utility model with the cover removed.

[0020] Figure 2 for Figure 1 A three-dimensional view of the component shown from another perspective.

[0021] Figure 3 for Figure 1 Top view of the component shown.

[0022] Figure 4 for Figure 1 Exploded view of the component shown.

[0023] Figure 5 for Figure 1 The diagram shows a 3D view of the component with the battery module hidden.

[0024] Figure 6 for Figure 5 Top view of the component shown.

[0025] Figure 7 for Figure 5 Exploded view of the component shown.

[0026] Figure 8 A perspective view showing the interior of another embodiment of the energy storage battery pack of this utility model with the cover removed.

[0027] Figure 9 for Figure 8 Exploded view of the component shown.

[0028] Figure 10 for Figure 8 A cross-sectional view of the component shown.

[0029] The components include: 1. Shell; 101. Immersion chamber; 11. Liquid inlet; 12. Liquid outlet; 13. Liquid inlet manifold; 14. Liquid outlet manifold; 2. Cooling plate; 21. Bottom plate; 22. Side plate; 3. Baffle pipe; 301. Spray hole; 31. Baffle pump; 4. Support component; 5. Battery module. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0031] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0032] Please see Figures 1 to 10 As shown, this utility model provides an immersion liquid cooling device for heat dissipation of components such as battery packs. The immersion liquid cooling device has an immersion chamber 101, which is filled with an immersion liquid to immerse and dissipate heat from the components housed within it. The immersion liquid cooling device also includes a cooling plate 2 disposed within the immersion chamber 101. The cooling plate 2 has cooling channels disposed therein, and the cooling channels are connected to an inlet 11 and an outlet 12. The inlet 11 and outlet 12 are connected to the outside of the immersion chamber 101 to allow refrigerant to enter and exit the cooling channels. The cooling channels are not interconnected with the immersion chamber 101; the refrigerant exchanges heat with the immersion liquid and / or the components to be cooled within the immersion chamber 101 through the cooling plate 2.

[0033] The immersion liquid cooling device provided by this utility model dissipates heat by immersing the component to be cooled in an immersion liquid. A cooling plate 2 is set in the immersion chamber 101, and the refrigerant flows in the cooling channels in the cooling plate 2. The cooling channels are not connected to the immersion chamber 101. The refrigerant exchanges heat with the immersion liquid and / or the component to be cooled in the immersion chamber 101 through the cooling plate 2. This arrangement not only achieves omnidirectional heat dissipation through immersion liquid cooling, avoiding the risk of local overheating, but also achieves effective overall temperature control of the immersion liquid and the component to be cooled through the contact between the cooling plate 2 and the immersion liquid and / or the component to be cooled, thus improving the overall heat dissipation performance and the stability of the overall temperature control.

[0034] Please see Figures 1 to 7 As shown, in this embodiment, the immersion liquid cooling device includes a housing 1, a cooling plate 2, a flow-deflecting component, and a support component 4. The housing 1 encloses an immersion cavity 101, which is filled with an immersion liquid for immersing and cooling components such as battery modules 5 within the immersion cavity 101. The cooling plate 2 is disposed within the immersion cavity 101 and has cooling channels inside. These channels are connected to an external refrigerant circulation system via an inlet 11 and an outlet 12. The cooling channels are completely isolated from the immersion cavity 101; that is, the refrigerant circulation is an independent circulation loop separate from the immersion liquid, and the liquids of the two are not connected. The refrigerant exchanges heat with the immersion liquid and / or the components to be cooled through the surface of the cooling plate 2. It should be noted that, in some embodiments, the cooling plate 2 may be in close contact with the component to be scald, in which case the cooling plate 2 and the component to be scald will directly exchange heat; in some embodiments, there may be a gap between the cooling plate 2 and the component to be scald, in which case the immersion liquid will fill the gap, and the cooling plate 2 and the immersion liquid will exchange heat; in some embodiments, the cooling plate 2 may also be partially in direct contact with the component to be scald and partially in direct contact with the immersion liquid.

[0035] Please see Figures 1 to 4 As shown, in this embodiment, the housing 1 is a hollow, sealed structure, and the upper cover plate of the housing 1 is omitted from the figure. It can be understood that the hollow, sealed structure of the housing 1 forms a sealed immersion cavity 101, preventing leakage of the immersion liquid filled within it. If necessary, a pressure relief valve is provided on the housing 1 to release pressure when the pressure inside the immersion cavity 101 becomes too high, thus preventing the risk of explosion. The immersion cavity 101 is filled with an immersion liquid with excellent insulating and thermal conductivity, such as fluorinated liquid, synthetic oil, or silicone oil. The component to be cooled, such as the battery module 5, is immersed in the immersion liquid, wherein the immersion can be complete or partial.

[0036] Please see Figures 3 to 7As shown, the cooling plate 2 includes at least a base plate located below the component to be scald. In this embodiment, the cooling plate 2 itself is a flat plate, and the entire cooling plate 2 is disposed below the component to be scald. In this embodiment, multiple cooling plates 2 are arranged in parallel, and the multiple cooling plates 2 distribute the input refrigerant through the liquid inlet manifold 13 and collect the output refrigerant through the liquid outlet manifold 14. In other embodiments, the cooling plate 2 may also be a single plate and configured to include multiple flow channel areas arranged in parallel. The liquid inlet manifold 13 and the liquid outlet manifold 14 are respectively connected to the multiple cooling plates 2 or the multiple flow channel areas to distribute and collect the refrigerant. This configuration has a simple structure and occupies less space within the immersion chamber 101.

[0037] In this embodiment, the cooling plate 2 is a phase change direct cooling plate. When the refrigerant flows within the cooling channel, a phase change occurs, absorbing a large amount of heat using latent heat, significantly improving heat dissipation efficiency. The gaseous refrigerant after the phase change is discharged through the liquid outlet 12, condensed externally, and then reliquefied for reuse. Specifically, in this embodiment, the cooling plate 2 includes several microchannel evaporation flat tubes, which form the cooling channel. The refrigerant flowing within is a phase change working fluid, such as R134A or R410A. When the refrigerant flows through the cooling channel, the phase change working fluid undergoes a liquid-gas phase change within a specific temperature range, absorbing a large amount of heat using latent heat. Compared to traditional single-phase water-cooled plates, phase change direct cooling plates offer advantages such as significantly improved heat exchange capacity per unit mass, significantly improved channel surface temperature uniformity, and reduced refrigerant flow requirements, thereby reducing the power consumption of the refrigerant circulation pump.

[0038] For further information, please refer to [link / reference]. Figures 3 to 7As shown, the immersion liquid cooling device includes a flow-dispersing element disposed near the upper part of the component to be cooled. The flow-dispersing element is configured to draw immersion liquid from a position near the base plate 21 and disperse it to the upper part of the component to be cooled. To enhance the liquid circulation efficiency within the immersion chamber 101 and to achieve effective heat dissipation of the battery cell tabs at the top of the battery module 5, this embodiment is equipped with an active flow-dispersing system. In this embodiment, the flow-dispersing element includes multiple flow-dispersing pipes 3, each with multiple injection holes 301. One end of each flow-dispersing pipe 3 is connected to a flow-dispersing pump 31 disposed near the base plate 21, which draws immersion liquid and delivers it to the flow-dispersing pipe 3. Specifically, in this embodiment, the flow-dispersing element includes two parallel flow-dispersing pipes 3, each with multiple injection holes 301 facing both sides on its wall. One end of each flow-dispersing pipe 3 is connected to the outlet of the flow-dispersing pump 31, and the other end is closed. The inlet of the flow-dispersing pump 31 extends to the area near the base plate 21. The turbulence pump 31 refers to a water pump used to draw up the immersion liquid and drive it to spray out, thereby agitating the flow of the immersion liquid. The specific type of pump is not limited; it can be a diaphragm pump, a piston pump, a gear pump, etc. In this embodiment, the turbulence pump 31 is positioned close to the inlet manifold 13. The immersion liquid here is at a lower temperature due to heat exchange with the newly introduced refrigerant. It is drawn upwards and evenly sprayed through the spray holes 301 of the turbulence pipe 3 onto the upper region of the battery module 5, which better achieves heat dissipation in this upper region and improves the overall temperature control uniformity.

[0039] Please see Figure 6 As shown, during operation, the refrigerant flows from the inlet manifold 13 to each cooling plate 2, and then flows out through the outlet manifold 14. The flow direction of the refrigerant is as follows: Figure 6 As indicated by the large arrow. When the turbulence pump 31 starts, it draws a cooler immersion liquid from the bottom of the immersion chamber 101 and delivers it to the turbulence pipe 3, forming a pressurized immersion liquid that is ejected from the spray hole 301, flowing in the direction shown by the arrow. Figure 6 As indicated by the small and medium arrows, a turbulent jet is formed in the area above battery module 5 to disrupt the temperature stratification formed by natural convection, force liquid mixing within the cavity, and improve the convective heat transfer coefficient. Furthermore, the jet directly washes over the top of battery module 5, eliminating heat dissipation blind spots in the top area. Additionally, the baffles also effectively dissipate heat from the battery cell tabs at the top of battery module 5.

[0040] Please see Figures 5 to 7As shown, in this embodiment, the immersion liquid cooling device further includes several support members 4 disposed on the housing 1. The support members 4 are used to support the component to be cooled to bear the pressure of the component. In this embodiment, by setting the support members 4 to support the weight of the battery module 5, the battery module 5 is prevented from directly pressing on the cooling plate 2, which would cause deformation or damage to the cooling plate 2 structure. The arrangement of the support members 4 corresponds to the support points of the battery module 5 to ensure uniform force distribution. In this embodiment, the support members 4 are preferably disposed at the corners and edges of the battery module 5. The support members 4 are provided with a bottom edge and a side edge. The bottom edge is used to support the battery module 5, and the side edge can also cooperate with the battery module 5 to achieve a positioning function. In this embodiment, the support members 4 are pre-welded and fixed to the housing 1 to ensure accurate positioning. Multiple cooling plates 2 are disposed between the support members 4, and the upper surface of the cooling plates 2 is not higher than the support surface of the support members 4 to avoid the battery module 5 directly pressing on the cooling plates 2.

[0041] Please see Figures 8 to 10 The illustration shows another embodiment of the energy storage battery pack of this utility model. The main difference between this embodiment and the previous embodiment lies in the structure of the cooling plate 2. In this embodiment, the cooling plate 2 includes a bottom plate portion 21 and a side plate portion 22 extending upward from the bottom plate portion 21. Cooling channels are provided in both the bottom plate portion 21 and the side plate portion 22, and the side plate portion 22 extends into the gap between two adjacent heat dissipation components. In this embodiment, the cooling plate 2 includes a side plate portion 22, which abuts against the side surface of the battery module 5, allowing for contact heat transfer to the side surface of the battery module 5. The bottom plate portion 21 and the side plate portion 22 are both provided with interconnected cooling channels, forming a three-dimensional heat dissipation network. Other components and structures not mentioned in this embodiment can be referred to... Figures 1 to 7 The configuration of the example shown will not be described again here.

[0042] The energy storage battery pack disclosed in this embodiment of the present invention uses the cooling device described above for heat dissipation. The energy storage battery pack includes a battery module 5 and the aforementioned immersion liquid cooling device. The battery module 5 is disposed within the immersion chamber 101, so that it is cooled by the cooling plate 2 and the immersion liquid. In this embodiment, the battery module 5 includes multiple square cells arranged side by side, adjacent cells are bonded together with thermally conductive structural adhesive, the battery module 5 is completely immersed in the immersion liquid, and the cooling plate 2 is located at the bottom of the battery module 5. During operation, the heat generated by the battery module 5 is diffused through natural convection of the immersion liquid on the one hand, and rapidly dissipated through forced cooling by the cooling plate 2 on the other hand, achieving dual heat dissipation protection.

[0043] The working process of one embodiment of the cooling device provided by this utility model is as follows: The refrigerant enters the inlet manifold 13 from the inlet 11 and is distributed to the cooling channels of each cooling plate 2; when flowing through the cooling plate 2, the refrigerant absorbs heat from the immersion liquid and the battery module 5 through the wall surface of the cooling plate 2, and the heated refrigerant undergoes phase change evaporation and is discharged from the outlet 12, completing the heat exchange cycle. At the same time, the turbulence pump 31 continuously pumps the low-temperature immersion liquid at the bottom to the turbulence pipe 3, forming a directional flow through the spray hole 301, breaking the natural stratification of the immersion liquid and enhancing the heat dissipation of the battery cell tabs, ensuring the temperature uniformity of the entire immersion chamber 101.

[0044] As can be seen from the above description of the specific embodiments, the cooling device provided by this utility model solves the problems of high contact thermal resistance and uneven heat dissipation of traditional cold plate heat dissipation by combining the heat dissipation of the immersion liquid with the heat dissipation of the bottom of the battery module 5 by the cooling plate 2 and the heat dissipation of the upper part of the battery module 5 by the turbulence component. It also effectively prevents the temperature stratification of the immersion liquid, realizes effective temperature control of the immersion liquid and the components to be cooled, and improves the overall heat dissipation performance and the stability of the overall temperature control.

[0045] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. An immersion liquid cooling device having an immersion chamber (101) to be filled with an immersion liquid to immerse heat dissipation for a heat dissipation target accommodated therein, characterized by, The immersion liquid cooling device includes a cooling plate (2) disposed in the immersion chamber (101). The cooling plate (2) has a cooling channel disposed therein, which is connected to an inlet (11) and an outlet (12). The inlet (11) and the outlet (12) are connected to the outside of the immersion chamber (101) for refrigerant to be input and output from the cooling channel. The cooling channel is not connected to the immersion chamber (101). The refrigerant contacts the immersion liquid in the immersion chamber (101) and / or the heat-dissipating component through the cooling plate (2) for heat exchange.

2. The liquid submersion cooling device of claim 1, wherein, The cooling plate (2) includes at least a base plate portion (21) located below the heat dissipation component, and the immersion liquid cooling device includes a baffle disposed near the upper part of the heat dissipation component, the baffle being configured to obtain immersion liquid from a position near the base plate portion (21) and disperse it to the upper part of the heat dissipation component.

3. The liquid submersion cooling device of claim 2, wherein, The turbulence-disrupting component includes multiple turbulence-disrupting pipes (3), and multiple injection holes (301) are provided on the turbulence-disrupting pipes (3).

4. The liquid submersion cooling device of claim 3, wherein, One end of the turbulence pipe (3) is connected to a turbulence pump (31) located near the bottom plate (21) to draw immersion liquid and deliver it to the turbulence pipe (3).

5. The liquid submersion cooling device of claim 4, wherein, The immersion liquid cooling device includes an inlet manifold (13) for inputting refrigerant into the cooling channel and an outlet manifold (14) for collecting refrigerant flowing out of the cooling channel. The turbulence pump (31) is located close to the inlet manifold (13).

6. The liquid submersion cooling device of claim 5, wherein, The cooling plates (2) are multiple ones arranged in parallel, or the cooling plates (2) include multiple flow channel areas arranged in parallel; wherein the liquid inlet manifold (13) and the liquid outlet manifold (14) are respectively connected to the multiple cooling plates (2) or the multiple flow channel areas.

7. The liquid submersion cooling device of claim 1, wherein, The cooling plate (2) includes a bottom plate portion (21) and a side plate portion (22) extending upward from the bottom plate portion (21). The cooling channels are provided in both the bottom plate portion (21) and the side plate portion (22). The side plate portion (22) extends into the gap between two adjacent heat dissipation components.

8. The liquid submersion cooling apparatus of any one of claims 1-7, wherein, The cooling plate (2) is a phase change direct cooling plate.

9. The liquid submersion cooling device of claim 1, wherein, The immersion liquid cooling device includes a housing (1) that surrounds the immersion cavity (101). The immersion liquid cooling device also includes a plurality of support members (4) disposed on the housing (1). The support members (4) are used to support the heat dissipation component to bear the pressure of the heat dissipation component.

10. An energy storage battery pack, characterized in that, Includes a battery module (5) and an immersion liquid cooling device as described in any one of claims 1 to 9, wherein the battery module (5) is a heat dissipation component disposed in the immersion chamber (101) for heat dissipation by the cooling plate (2) and the immersion liquid.

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