Dynamic immersed liquid-cooled battery pack

Abstract

The utility model relates to a dynamic immersed liquid-cooled battery pack. The dynamic immersed liquid-cooled battery pack comprises a box body, a box cover, a plurality of battery modules and an immersion liquid circulating system, the plurality of battery modules are arranged in the box body, the immersion liquid circulating system is arranged around the plurality of battery modules, the box cover is arranged on the box body, and the box cover is used for sealing the box body; the box cover is used for accommodating a plurality of battery modules, the immersion liquid circulation system is used for reducing the temperature of the plurality of battery modules, the battery pack bottom heat discharge system discharges the heat of the battery pack through a common liquid cooling liquid, and related mature design and equipment of the liquid cooling battery pack which is applied on a large scale are adopted; potential fault points and manufacturing difficulty are reduced, lower system pressure and fewer potential fault points under the same cell temperature uniformity level are achieved, and manufacturing and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a dynamic immersion liquid-cooled battery pack. Background Technology

[0002] With the large-scale application of electric vehicles and energy storage systems, battery pack thermal management technology has become a core element in overcoming performance bottlenecks. Among them, the temperature uniformity of the cells directly determines the system efficiency. When the temperature difference between cells is well controlled, the consistency of their state of charge (SOC) and temperature can be improved, and the system cycle life can be extended. Conversely, excessive temperature difference will lead to accelerated aging of local cells, increased capacity decay rate, and may even cause thermal runaway of cells.

[0003] Immersion cooling technology achieves breakthroughs in heat transfer contact surface and efficiency by completely immersing the battery cells in an insulating cooling medium, effectively improving cell temperature uniformity. Simultaneously, immersion cooling technology provides "active prevention" through physical isolation and rapid heat absorption, effectively preventing thermal runaway of the cells. Currently, this technology is gradually moving from the laboratory to large-scale applications, demonstrating irreplaceable advantages in scenarios with high heat dissipation and high safety requirements, such as high-rate charging and discharging and data center backup power.

[0004] Currently released immersion cooling technology solutions include two modes of immersion liquid treatment: static mode and dynamic mode. The dynamic mode provides better cell temperature uniformity, but at the same time, the dynamic mode solutions often have complex structures, high internal system pressure, many potential failure points, and stringent requirements on the performance of the matching immersion liquid circulation system. Therefore, many battery pack designs using immersion cooling technology, although they have no problems in simulation and sample testing, are prone to problems such as high cost, immersion liquid leakage, casing deformation, and circulation pump damage, which prevent large-scale application. Utility Model Content

[0005] The purpose of this invention is to propose a dynamic immersion liquid-cooled battery pack that achieves lower system pressure and fewer potential failure points while maintaining the same level of cell temperature uniformity, and facilitates manufacturing and maintenance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dynamically submerged liquid-cooled battery pack, comprising:

[0008] The enclosure, cover, multiple battery modules, and immersion liquid circulation system;

[0009] The plurality of battery modules are disposed inside the housing, the immersion liquid circulation system is disposed around the plurality of battery modules, the housing cover is disposed on the housing, the housing cover is used to seal the housing; the housing cover is used to accommodate the plurality of battery modules, and the immersion liquid circulation system is used to reduce the temperature of the plurality of battery modules.

[0010] Preferably, the immersion liquid circulation system includes a pump body and pipelines.

[0011] Preferably, the bottom of the housing has an inner cavity as a coolant flow channel.

[0012] Preferably, the side wall of the box is provided with an inner cavity as a channel for the immersion liquid.

[0013] Preferably, the immersion liquid channel includes an internal immersion liquid inlet and an internal immersion liquid outlet.

[0014] Preferably, the front wall of the box is provided with an external outlet for the immersion liquid and an external inlet for the immersion liquid.

[0015] Preferably, the front wall of the housing is also provided with a coolant outlet and a coolant inlet.

[0016] Preferably, the housing is provided with an immersion liquid flow channel.

[0017] Preferably, the baffle causes the immersion liquid to flow towards the left wall of the tank, and the immersion liquid enters the immersion liquid flow channel from the external inlet of the immersion liquid.

[0018] Preferably, the coolant enters from the coolant inlet into the coolant flow channel at the bottom of the housing, and then flows out from the coolant outlet.

[0019] Compared with existing technologies, this utility model embodiment fully considers the complexity of actual large-scale mass production and decomposes the battery pack heat treatment into two independent systems: one for uniform heat distribution within the battery pack and the other for heat dissipation at the bottom of the battery pack. The uniform heat distribution system within the battery pack reduces cell temperature differences by dynamically circulating the internal insulating immersion fluid. Moreover, this single-cell-pack-level circulation system has low internal pressure, easy-to-implement equipment requirements, and simple and easy-to-maintain piping. The heat dissipation system at the bottom of the battery pack dissipates heat from the battery pack using ordinary liquid cooling fluid. It adopts mature designs and equipment for liquid-cooled battery packs that are already widely used, reducing potential failure points and manufacturing difficulties. This achieves lower system pressure and fewer potential failure points at the same level of cell temperature uniformity, facilitating manufacturing and maintenance. Attached Figure Description

[0020] The above and other objects, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0021] Figure 1 This is a schematic diagram of a dynamic immersion liquid-cooled battery pack proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of a box body proposed in this utility model;

[0023] Figure 3 This is a side view of the immersion liquid and coolant circulation movement proposed in this utility model;

[0024] Figure 4 The present invention proposes a method Figure 2 A partially enlarged sectional view at point A in the middle;

[0025] Figure 5 This is a schematic diagram illustrating the flow of coolant at the bottom of the housing according to the present invention.

[0026] Figure 6 This is a schematic diagram illustrating the flow of immersion liquid on the inner side of the front wall of the box according to the present invention.

[0027] Figure 7 This is a schematic diagram illustrating the flow of immersion liquid on the inner side of the left wall of the box according to this utility model;

[0028] Figure 8 This is a schematic diagram illustrating the flow of immersion liquid on the inner side of the rear wall of the box according to the present invention.

[0029] Figure 9 This is a schematic diagram illustrating the flow of immersion liquid on the inner side of the right wall of the box according to the present invention.

[0030] Figure 10 This is a schematic diagram illustrating the internal flow direction of the immersion liquid in the tank according to the present invention.

[0031] Figure 11 The present invention proposes a method Figure 10 A cross-sectional diagram showing the flow direction of the immersion liquid inside the tank in the middle BB section;

[0032] Figure 12 This invention provides a simulated flow path diagram of the immersion liquid inside a battery pack.

[0033] Figure 13 This invention presents a simulated flow path diagram of the coolant at the bottom of a battery pack. Detailed Implementation

[0034] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0035] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0036] Reference Figure 1 The diagram shows a schematic representation of a dynamic immersion liquid-cooled battery pack according to an embodiment of the present invention, comprising:

[0037] 1. Box body; 2. Box cover; 3. Multiple battery modules; 4. Immersion liquid circulation system;

[0038] In this embodiment of the present invention, the plurality of battery modules 3 are disposed inside the housing 1, the immersion liquid circulation system 4 is disposed around the plurality of battery modules 3, the housing cover 2 is disposed on the housing 1, the housing cover 2 is used to seal the housing 1; the housing cover 2 is used to accommodate the plurality of battery modules 3, and the immersion liquid circulation system 4 is used to reduce the temperature of the plurality of battery modules 3.

[0039] In this embodiment of the invention, taking into full account the complexity of actual large-scale mass production, the battery pack heat treatment is decomposed into two independent systems: one for uniform heat distribution within the battery pack and the other for heat dissipation from the bottom of the battery pack. The uniform heat distribution system within the battery pack uses dynamic circulation of the internal insulating immersion fluid to reduce cell temperature differences. Moreover, this single-cell-pack-level circulation system has low internal pressure, making the equipment easy to implement and the piping simple and easy to maintain. The heat dissipation system at the bottom of the battery pack dissipates heat using ordinary liquid cooling fluid. It adopts mature designs and equipment for liquid-cooled battery packs that are already widely used, reducing potential failure points and manufacturing difficulties. This achieves lower system pressure and fewer potential failure points while maintaining the same level of cell temperature uniformity, facilitating manufacturing and maintenance.

[0040] Reference Figure 2 The diagram shows a schematic of a dynamic immersion liquid-cooled battery pack according to an embodiment of the present invention. The immersion liquid circulation system includes a pump body and pipelines.

[0041] Furthermore, the bottom of the housing is provided with an inner cavity as a coolant flow channel.

[0042] In this embodiment of the invention, the side wall of the box is provided with an inner cavity as a channel for the immersion liquid.

[0043] On the other hand, the immersion liquid channel includes an internal immersion liquid inlet and an internal immersion liquid outlet.

[0044] Furthermore, the front wall of the box is provided with an external outlet for the immersion liquid and an external inlet for the immersion liquid.

[0045] In a specific embodiment of this utility model, the front wall of the housing is also provided with a coolant outlet and a coolant inlet.

[0046] Specifically, this utility model is a dynamic immersion liquid-cooled battery pack, consisting of a housing 1, a cover 2, multiple battery modules 3, and an immersion fluid circulation system 4. The bottom of the housing 1 has an inner cavity serving as a coolant flow channel 11, and the side walls of the housing have inner cavities serving as immersion fluid flow channels 12, equipped with multiple internal immersion fluid outlets 13 and internal immersion fluid inlets 14. The front wall 112 of the housing has external immersion fluid outlets 16, external immersion fluid inlets 17, coolant outlets 19, and coolant inlets 18. The immersion fluid circulation system 4 includes a circulation pump 41 and corresponding piping. The battery pack bottom heat dissipation system dissipates heat from the battery pack using ordinary liquid cooling fluid, employing mature designs and equipment already widely used in liquid-cooled battery packs, reducing potential failure points and manufacturing difficulties. This achieves lower system pressure and fewer potential failure points while maintaining the same cell temperature uniformity, facilitating manufacturing and maintenance.

[0047] Reference Figure 3 The diagram shows a side view of the circulation of immersion liquid and coolant according to an embodiment of the present invention. Figure 3 The diagram shows the liquid flow from the front wall to the rear wall of the housing. The upper part of the dynamic immersion liquid-cooled battery pack uses the circulation of the immersion liquid to drive heat flow and reduce the temperature difference of the cells. It should be noted that the battery module 3 is completely immersed in the immersion liquid; while the bottom uses the circulation of the coolant to dissipate the heat inside the battery pack.

[0048] Specifically, the immersion liquid flows out from the external outlet 16 to the circulation pump 41, and the circulation pump 41 draws the immersion liquid into the housing 1 from the external inlet 17; while the coolant enters from the coolant inlet 18 into the coolant channel 11 at the bottom of the housing 1, and then flows out from the coolant outlet 19, realizing the circulation of coolant to dissipate heat from the battery pack.

[0049] Reference Figure 4 As shown, a partially enlarged cross-sectional view of point A of a box body according to an embodiment of the present invention is displayed, as follows: Figure 2 As shown at point A, the baffle 110 is used to block the submersible fluid from flowing in the opposite direction, thereby constraining the flow direction of the submersible fluid. The submersible fluid enters the submersible fluid channel 12 of the housing 1 from the external submersible fluid inlet 17, and the obstruction of the baffle 110 causes the submersible fluid to flow towards the left wall 113 of the housing. Furthermore, the coolant enters the coolant channel 11 at the bottom of the housing 1 from the coolant inlet 18, and then flows out from the coolant outlet 19, with the specific flow direction as shown. Figure 5As shown by the arrow, coolant outlet 19 is connected to the liquid coolant outlet pipeline of the liquid cooler unit, and coolant inlet 18 is connected to the liquid coolant return pipeline of the liquid cooler unit.

[0050] Reference Figure 6 The diagram illustrates the flow of immersion liquid on the inner side of the front wall of a housing according to an embodiment of the present invention. Figure 6 In the inward direction shown, the immersion liquid driven by the circulation pump 41 is injected into the immersion liquid channel from the external immersion liquid inlet 17 and flows to the immersion liquid channel on the left wall 113 of the tank. The immersion liquid flows in from the immersion liquid channel on the right wall 115 of the tank and then flows into the circulation pump 41 from the external immersion liquid outlet 16. Point E in the figure represents the immersion liquid level of the tank 1. Point R in the figure represents the flow direction of the immersion liquid flowing in from the immersion liquid channel on the right wall 115 of the tank. Point W in the figure represents the flow direction of the immersion liquid flowing from the inside of the tank 1 to the circulation pump 41.

[0051] Reference Figure 7 The diagram shows a schematic of the flow of immersion liquid on the inner side of the left wall of the housing according to an embodiment of the present invention. An internal immersion liquid outlet 13 is provided in the immersion liquid flow channel 12 of the left wall 113 of the housing. The immersion liquid flows into the interior of the housing 1 and, after contacting the surface of the battery module 3, drives the flow of heat. On the other hand, the immersion liquid flows from the immersion liquid flow channel 12 of the front wall 112 of the housing to the immersion liquid flow channel of the left wall 113 of the housing. In the figure, T indicates the flow direction of the immersion liquid flowing into the immersion liquid flow channel of the front wall 112 of the housing, and Q indicates the flow direction of the immersion liquid flowing into the interior of the housing 1.

[0052] Reference Figure 8 The diagram shows a schematic of the flow of immersion liquid on the inner side of the rear wall of the housing according to an embodiment of the present invention. The rear wall 114 of the housing is also provided with multiple internal immersion liquid outlets 13, which flow into the interior of the housing 1 and carry heat flow after contacting the surface of the battery module 3. The immersion liquid flows from the immersion liquid flow channel 12 of the left wall 113 of the housing to the immersion liquid flow channel of the rear wall 114 of the housing. In the figure, O indicates the flow direction of the immersion liquid flowing into the immersion liquid flow channel of the left wall 113 of the housing, and U indicates the flow direction of the immersion liquid flowing into the interior of the housing 1.

[0053] Reference Figure 9 The diagram shows a schematic of the flow of immersion liquid on the inner side of the right wall of the housing according to an embodiment of the present invention. The right wall 115 of the housing is provided with multiple internal immersion liquid inlets 14. The immersion liquid flows in from the inside of the housing 1 through the internal immersion liquid inlets 14, flows through the immersion liquid flow channel 12 to the external immersion liquid outlet 16, and completes the circulation of the immersion liquid. J in the figure indicates the flow direction of the immersion liquid flowing in from the inside of the housing 1. The present invention does not impose too many restrictions on the types of immersion liquid and coolant.

[0054] Reference Figure 10The diagram illustrates the internal flow direction of the immersion liquid in a housing according to an embodiment of the present invention. A baffle 110 prevents the immersion liquid from flowing in the opposite direction, constraining its flow direction. The baffle 110 causes the immersion liquid to flow towards the left wall 113 of the housing. The immersion liquid enters the immersion liquid channel from the external inlet 17, flows into the housing 1 through the internal immersion liquid outlet 13, and then flows into the housing 1. Part of the immersion liquid entering the housing 1 flows into the immersion liquid channel from the internal immersion liquid inlet 14 and then back to the external outlet 16. The other part flows over the surface of the battery module 3 and then directly into the external outlet 16. Flow direction arrows are used for easy identification. Figure 10 The spacing between battery modules 3 and between battery modules 3 and housing 1 was increased, and the wall thickness of housing 1 was increased.

[0055] Reference Figure 11 The diagram shown illustrates a cross-sectional view of the internal flow direction of the immersion liquid in a tank, according to an embodiment of this utility model. Figure 10 As shown in the cross-section at point BB, the level of the immersion liquid inside the casing 1 is higher than the height of the battery module 3, that is, point E in the figure represents the level of the immersion liquid in the casing 1.

[0056] In a preferred embodiment of this utility model, a wet and dry partition is provided between the front part of the battery module and the front wall of the box.

[0057] In another specific example, the inlet and outlet are equipped with bidirectional shut-off valves.

[0058] In a preferred embodiment of this utility model, a flow guide baffle is provided between the battery modules, and a flow guide baffle is provided in the battery cell within the battery module; the immersion liquid circulation system 4 can be integrated into a pump body and a flow channel plate (the flow guide baffle and flow channel plate mentioned above are not shown in the figure).

[0059] In a preferred embodiment, the immersion liquid circulation system 4 is changed to be shared by two or more battery packs;

[0060] On the other hand, the immersion liquid flow channel inside the side wall of the enclosure can be replaced with an independent flow channel assembly installed inside the enclosure.

[0061] Specifically, the housing 1 includes two independent flow channels: a bottom cavity serves as a coolant flow channel 11, which, together with the coolant outlet 19 and coolant inlet 18 on the front wall 112, and the external liquid cooling unit and piping, forms a heat dissipation system at the bottom of the battery pack. This system uses the driven coolant to remove the heat generated by the cells from the battery pack. The side wall of the housing also has a cavity serving as a submerged liquid flow channel 12, equipped with multiple internal submerged liquid outlets 13 and internal submerged liquid inlets 14. This, together with the external submerged liquid outlet 16 and external submerged liquid inlet 17 on the front wall 112, and the submerged liquid circulation system 4, forms a heat uniformity system within the battery pack. This system uses the driven submerged liquid to circulate along the designed flow channels, carrying the heat from the top of the cells to the bottom of the battery pack in real time, effectively improving the temperature uniformity of the cells. Figure 12 As shown, a simulated flow pattern of immersion liquid inside a battery pack according to an embodiment of this utility model is illustrated; as... Figure 13 The diagram shown illustrates a simulated flow path of coolant at the bottom of a battery pack according to an embodiment of this invention.

[0062] Optionally, a wet / dry partition is added between the front of the battery module 3 and the front wall 112 of the housing. Optionally, a two-way shut-off valve is installed at the liquid inlet and outlet. Optionally, a flow guide partition is added between the battery modules 3. Optionally, a flow guide partition is added between the cells within the battery module 3. Optionally, the immersion liquid circulation system 4 can be integrated into a pump body and a flow channel plate.

[0063] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0064] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0065] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0066] While this specification has shown and described various embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A dynamically submerged liquid-cooled battery pack, characterized in that, include: The enclosure, cover, multiple battery modules, and immersion liquid circulation system; The plurality of battery modules are disposed inside the housing, the immersion liquid circulation system is disposed around the plurality of battery modules, the housing cover is disposed on the housing, the housing cover is used to seal the housing; the housing cover is used to accommodate the plurality of battery modules, and the immersion liquid circulation system is used to reduce the temperature of the plurality of battery modules.

2. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The immersion liquid circulation system includes a pump body and pipelines.

3. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The bottom of the housing has an inner cavity that serves as a coolant flow channel.

4. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The side wall of the box has an inner cavity as a channel for the immersion liquid.

5. The dynamic immersion liquid-cooled battery pack according to claim 4, characterized in that, The immersion liquid flow channel includes an internal immersion liquid inlet and an internal immersion liquid outlet.

6. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The front wall of the box is provided with an external outlet for the immersion liquid and an external inlet for the immersion liquid.

7. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The front wall of the enclosure is also provided with a coolant outlet and a coolant inlet.

8. The dynamic immersion liquid-cooled battery pack according to claim 1, characterized in that, The box is equipped with an immersion liquid flow channel.

9. The dynamic immersion liquid-cooled battery pack according to claim 8, characterized in that, The baffle causes the immersion liquid to flow towards the left wall of the tank, and the immersion liquid enters the immersion liquid flow channel from the external inlet.

10. The dynamic immersion liquid-cooled battery pack according to claim 7, characterized in that, The coolant enters from the coolant inlet into the coolant channel at the bottom of the housing, and then flows out from the coolant outlet.

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