Fully immersed cooling battery system

Abstract

The utility model discloses a fully-immersed cooling battery system. The fully-immersed cooling battery system comprises a lower box body, an upper cover, a flow equalizing plate and a battery module, the battery module is located in the lower box body, the flow equalizing plate is arranged between the battery module and the upper cover, the upper cover is provided with a liquid inlet assembly, the liquid outlet end of the liquid inlet assembly is connected with a spraying device, the lower box body is provided with a liquid outlet, and the flow equalizing plate is provided with a flow channel used for conducting flow guiding, flow dividing or flow equalizing on cooling liquid sprayed out by the spraying device. Therefore, the cooling liquid entering in a radial manner is subjected to flow equalizing and guiding, so that the cooling liquid uniformly flows to the top of the battery module, then flows through the gaps of the battery module and flows out of the liquid outlet. According to the utility model, the spraying device and the flow equalizing plate are matched with each other, an upper-inlet lower-outlet flow direction is adopted, a circulating flow channel with high uniformity and a short circulating path is provided, a cooling liquid flowing path is short, the distribution is uniform, all-directional cooling is realized, the temperature of a battery system under a fast charging condition can be effectively controlled, and the system achieves the effects of efficient heat exchange and excellent temperature equalization.

Description

Technical Field

[0001] The utility model relates to the technical field of immersion battery systems, in particular to a fully immersed cooling battery system. Background Art

[0002] Immersion cooling technology is a cooling technology that immerses heat-generating equipment in insulating coolant and directly removes heat through the circulation of coolant or boiling phase change. This immersion cooling technology was introduced with the emergence of some high-heat dissipation and high-security scenarios such as data centers, in order to replace air cooling technology and traditional liquid cooling technology that cannot meet the heat dissipation requirements in high-heat dissipation scenarios. At present, the development of immersion cooling in the field of data centers has entered a comprehensive application period, and has radiated to other industries, with a large number of mature products being used by clients.

[0003] As clients' demands for fast charging and safety of battery systems gradually increase, major manufacturers have launched high-rate charging and discharging products, which puts higher requirements on the heat dissipation and safety of battery systems. Since the application scenarios in new energy battery systems are very similar to those in data centers, immersion cooling technology has begun to be paid attention to by the new energy industry, and has been deeply studied and used, becoming one of the development directions of future battery thermal management systems.

[0004] At present, the thermal management methods of new energy electric vehicles and energy storage industries mainly include air cooling systems and liquid cooling systems. In view of the client's demand for fast charging and safety, the commonly used air cooling and liquid cooling methods cannot meet the battery cell temperature requirements, and cannot meet the requirements of fast charging and thermal safety performance. If the cooling effect of conventional thermal management methods is to be improved, the cost will be greatly increased, the cooling performance cannot be absolutely guaranteed, and the thermal safety performance remains to be verified. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies and defects of the prior art and to provide a fully immersed cooling battery system.

[0006] A fully immersed cooling battery system comprises a lower box, an upper cover, a flow equalizing plate, and a battery module; the battery module is located in the lower box, the flow equalizing plate is placed between the battery module and the upper cover, the upper cover is provided with a liquid inlet assembly, the liquid outlet end of the liquid inlet assembly is connected to a spraying device, the lower box is provided with a liquid outlet, and the flow equalizing plate is provided with a flow channel for guiding, diverting or equalizing the coolant sprayed by the spraying device, so as to guide the coolant entering radially to flow evenly to the top of the battery module, and then flow through the gap between the battery modules and flow out from the liquid outlet.

[0007] Optionally, the flow channel on the flow balancing plate extends from the top surface to the bottom surface of the flow balancing plate to form a multi-layer zigzag structure.

[0008] Optionally, the flow channel is set at an inclination angle so that the flow channel is arranged in an inclined shape from top to bottom and to all sides.

[0009] Optionally, the inclination angle φ=30°-45°.

[0010] Optionally, the area of ​​the flow equalizing plate is the same as the vertical projection area of ​​the lower box body and the upper cover.

[0011] Optionally, the flow equalizing plate is fixed to the lower box body and the upper cover by bolts.

[0012] Optionally, the lower box is a rectangular box, the upper cover and the current equalizing plate are rectangular structures, and the battery module is composed of stacked square battery cells.

[0013] Optionally, the spraying device includes a spraying ball head, a cavity is provided in the spraying ball head, a jet hole communicated with the cavity is provided on the surface of the spraying ball head, and the liquid inlet of the cavity is connected to the liquid outlet of the liquid inlet component.

[0014] Optionally, there are multiple liquid inlet components, which are fixed to the mounting holes on the surface of the upper cover, and each of the liquid inlet components is connected to one of the spraying devices.

[0015] Optionally, the upper cover is a groove-type upper cover with side panels on all sides, and the bottom of the side panels is formed with a flange edge with bolting holes for easy bolting with the flow equalizing plate and the lower box body.

[0016] The fully immersed cooling battery system of the utility model adopts a liquid inlet component and a flow equalizing plate to cooperate with each other, and adopts a top-in and bottom-out flow direction to provide a circulation flow channel with high uniformity and short circulation path. The coolant flow path is short and evenly distributed, realizing all-round cooling, greatly improving the cooling effect, and can effectively control the temperature of the battery system under fast charging conditions, so that the system can achieve efficient heat exchange and excellent temperature equalization. The fully immersed cooling method is adopted, and the interior of the box is filled with coolant with high heat exchange efficiency, long life and high insulation characteristics, which improves the thermal management efficiency of the battery system and completely isolates oxygen to achieve the effect of never catching fire, thereby improving the thermal safety performance of the entire system. The cooling components are reduced, the system energy density and volume utilization are improved, and the use cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an assembly diagram of the fully immersed cooling battery system of the present utility model.

[0018] Figure 2 This is a schematic diagram of a spray device installed on the inner side of the upper cover of the utility model.

[0019] Figure 3It is a schematic diagram of the connection between the liquid inlet assembly and the spraying device of the utility model.

[0020] Figure 4-Figure 6 The utility model includes a bottom view, a top view and an axonometric cross-sectional view of the flow equalizing plate.

[0021] Figure 7-Figure 9 It is a schematic diagram of the coolant flow direction of the battery pack of the utility model in the front view, top view and axonometric view (indicated by the arrows in the figure).

[0022] Description of reference numerals:

[0023] 1-liquid inlet assembly; 2-upper cover; 3-flow equalizing plate; 4-battery module; 5-liquid outlet; 6-lower box; 211-spraying device, 21-side plate; 212-spraying ball head; 213-spray hole; 31-flow channel. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figures 1 to 9 As shown, the fully immersed cooling battery system provided by the embodiment of the utility model includes a lower box body 6, an upper cover 2, a flow equalizing plate 3, and a battery module 4; the battery module 4 is located in the lower box body 6, the flow equalizing plate 3 is placed between the battery module 4 and the upper cover 2, the upper cover is provided with a liquid inlet component 1, the liquid outlet end of the liquid inlet component 1 is connected to the spraying device 211, the lower box body 6 is provided with a liquid outlet 5, the flow equalizing plate 3 is provided with a flow channel 31 for guiding, diverting or equalizing the coolant, so as to guide the coolant entering radially from top to bottom in a spraying manner by the spraying device 211 to flow evenly, so that it flows evenly to the top of the battery module 4, and finally the coolant flows through the gap of the battery module 4 and flows out from the liquid outlet arranged on the lower side of the lower box body.

[0026] In the present application, since the coolant enters the liquid inlet component 1 from the outside, the coolant is sprayed in all directions around through the spray device 211. Under the pressure of the oil pump, the coolant is sprayed through the spray device 211, which will inevitably produce a radial flow with the spray device as the center; and under the action of gravity, the coolant will flow directly downward, causing a circulation dead zone to form in the upper corner area of ​​the battery cell. Therefore, a flow equalizing plate is set to equalize the flow, and the flow is evenly flowed to the top of the module through the blocking and equalization of the flow equalizing plate 3 and the flow diversion radiating to the surrounding areas. The coolant flows into the battery module 4, and then flows to the liquid outlet 5 along the gap between the battery modules. As Figures 7 to 9 As shown, the coolant flows along Figures 7 to 9 The flow path indicated by the arrows in the figure can cover the entire battery module and achieve rapid and uniform cooling.

[0027] In this application, the coolant inlet adopts the top spray mode, the coolant circulation path is short, directly from the top to the bottom of each battery cell, the temperature difference between the battery cell and the coolant is large, and more heat can be taken away. And because the top coolant is directly sprayed from the spray device, the temperature difference is small, and the temperature difference between the battery cells after cooling is also small; the battery cell state consistency is high, which is conducive to ensuring the cycle life of the battery system.

[0028] In the above implementation scheme, the size of the flow equalizing plate 3 is the same as that of the lower box body and the upper cover, that is, the area of ​​the vertical projection is the same. Since the battery system is an immersed battery pack, the upper cover 2, the flow equalizing plate 3 and the lower box body 5 are bolted and fixed by sealing gaskets to improve the sealing effect and prevent coolant leakage. The top end of the side of the lower box body 5 has a flange edge with a bolting hole, and the four sides of the flow equalizing plate 3 have matching bolting holes.

[0029] In an optional embodiment, each flow channel 31 on the flow equalizing plate 3 is arranged in a rectangular shape, and is a layered structure, forming a multi-layered zigzag structure, see Figure 4 , 5 As shown in FIG6 , the top surface of the equalizing plate 3 is connected to the bottom surface. A connection structure is provided on the top of the equalizing plate 3. The connection structure can be cross-shaped and used for connecting the multi-layer structure, maintaining the width of the flow channel 31, and the equalizing plate is integrally formed.

[0030] Preferably, the lower box 6 is a rectangular box, the upper cover and the current balancing plate are rectangular structures, and the battery module 4 is a battery pack composed of stacked square cells, such as Figure 1 As shown, the liquid outlet 5 is arranged at the bottom of the side plate of the lower box body to facilitate the outflow of the coolant.

[0031] In the present application, the liquid inlet assembly 1 is a tubular body, which can be a liquid inlet joint, whose liquid inlet end is connected to an external coolant pipeline, and whose liquid outlet end is connected to a spraying device 211, so as to deliver the external coolant into the spraying device 211. Preferably, the liquid inlet assembly 1 is welded and fixed to the upper cover 2, and the upper cover 2 is prefabricated with a welding installation hole, and the liquid inlet assembly 1 is welded and fixed after being installed into the welding installation hole.

[0032] Among them, in order to achieve that the coolant enters the battery system and flows to the top of the battery cell of the battery module through the flow equalizing plate, there are multiple liquid inlet components and multiple spraying devices 211. Preferably, four liquid inlet components 1 and four spraying devices 211 are provided, which are evenly distributed so that the coolant entering in a spraying and radial manner can fully cover the battery module below. Of course, the number of the liquid inlet components 1 and the spraying devices 211 is not limited to this, and the specific number can be determined according to the size of the battery box.

[0033] Due to the existence of the spraying device 211 of the present application, it will protrude from the bottom surface of the upper cover. In order to avoid and make the spraying device 211 and the equalizing plate 3 separated by a predetermined distance in the vertical direction, in the present application, the upper cover adopts a non-flat upper cover, but a grooved upper cover with vertically arranged side panels 21 on all sides, and the bottom of the side panel forms a flange edge which is convenient for bolting with the equalizing plate and the lower box body, with bolting holes, and the side panel is L-shaped.

[0034] In an optional embodiment, the spray device 211 is made of aluminum alloy or resin and glass fiber, and preferably includes a spray ball head 212. The spray ball head has a diameter of 45-60 mm, a built-in cavity, a wall thickness of 2 mm, and a uniform spray hole 213 on the surface that communicates with the cavity. The liquid inlet of the cavity is connected to the liquid outlet end of the liquid inlet component 1 to ensure lightweight while ensuring functionality.

[0035] In an optional embodiment, the flow equalizing plate 3 is formed by injection molding, and its material can be a mixture of resin and glass fiber, or a material that can be injection molded, such as resin.

[0036] In an optional embodiment, the flow channel of the flow equalizing plate is set with an inclination angle φ, and the flow channel is inclined in all directions, which can achieve the diversion and equalization of the coolant sprayed radially in from the liquid inlet component of the upper cover, and avoid the uneven liquid flow caused by the liquid inlet component spraying the liquid, so as to perform secondary flow equalization, allowing the coolant to flow to the inner wall of the battery pack and flow to the corners as much as possible to ensure that coolant flows on the top of each battery cell in the battery module without circulation dead corners. Preferably, the flow channel inclination angle φ = 30°-45°, and the flow channel width d = 20-30mm, such as Figure 6 shown.

[0037] In an optional embodiment, the bottom surface of the battery cell of the battery module 4 is bonded and fixed to the lower box 6 by a thermally conductive structural adhesive.

[0038] In a preferred embodiment, the upper cover 2 is formed of a composite material, such as PCM, SMC or other composite materials, and preferably has a thickness of 1.5-2 mm.

[0039] As an optional embodiment, the lower box body 6 is made of aluminum alloy and is formed by an extrusion profile forming process, which can achieve the purpose of lightweight.

[0040] The fully immersed cooling battery system provided by the embodiment of the utility model completely immerses the battery cells in a highly insulating cooling liquid, and adopts a liquid inlet assembly in conjunction with a flow equalizing plate, and adopts a top-in and bottom-out flow direction, so that the coolant can flow to the corners of the battery pack, and can provide a circulation flow channel with high uniformity and a short circulation path. The coolant flow path is short and evenly distributed, thereby achieving comprehensive, uniform and rapid cooling of the battery cells, greatly improving the cooling effect, and can effectively control the temperature of the battery system under fast charging conditions, so that the system can achieve the effects of efficient heat exchange and excellent temperature uniformity.

[0041] The fully immersed cooling battery system of the utility model can achieve the effects of efficient heat exchange and excellent temperature uniformity according to the performance parameters of the high-insulation coolant and combined with the battery system structure design, while improving the system energy density and thermal safety performance, and realizing the effects of high-rate charging and discharging and thermal runaway without fire and diffusion; at the same time, it takes into account both the vehicle-mounted and energy storage fields and has strong scalability.

[0042] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model.

[0043] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Fully immersed cooling battery system, characterized in that: It includes a lower box body, an upper cover, a flow equalizing plate, and a battery module; the battery module is located in the lower box body, the flow equalizing plate is placed between the battery module and the upper cover, the upper cover is provided with a liquid inlet assembly, the liquid outlet end of the liquid inlet assembly is connected to a spray device, the lower box body is provided with a liquid outlet, and the flow equalizing plate is provided with a flow channel for guiding, diverting or equalizing the coolant sprayed by the spray device, so as to guide the coolant entering radially to flow evenly to the top of the battery module, and then flow through the gap of the battery module and flow out from the liquid outlet.

2. The fully immersed cooling battery system according to claim 1, characterized in that: The flow channel on the flow balancing plate extends from the top surface of the flow balancing plate to the bottom surface, forming a multi-layer zigzag structure.

3. The fully immersed cooling battery system according to claim 1, characterized in that: The flow channel is set at an inclined angle so that the flow channel is arranged in an inclined shape from top to bottom and all around.

4. The fully immersed cooling battery system according to claim 3, characterized in that: The inclination angle φ=30°-45°.

5. The fully immersed cooling battery system according to claim 1, characterized in that: The area of ​​the vertical projection of the flow equalizing plate, the lower box body and the upper cover is the same.

6. The fully immersed cooling battery system according to claim 1, characterized in that: The flow equalizing plate is connected and fixed to the lower box body and the upper cover by bolts.

7. The fully immersed cooling battery system according to claim 1, characterized in that: The lower box body is a rectangular box, the upper cover and the current equalizing plate are rectangular structures, and the battery module is composed of stacked square battery cells.

8. The fully immersed cooling battery system according to claim 1, characterized in that: The spraying device comprises a spraying ball head, a cavity is provided in the spraying ball head, a jet hole is provided on the surface of the spraying ball head which is communicated with the cavity, and is connected with the liquid outlet end of the liquid inlet component through the liquid inlet connected to the cavity.

9. The fully immersed cooling battery system according to claim 1, characterized in that: There are multiple liquid inlet components, which are fixed to the mounting holes on the surface of the upper cover, and each of the liquid inlet components is connected to one of the spraying devices.

10. The fully immersed cooling battery system according to claim 1, characterized in that: The upper cover is a groove-type upper cover with side plates on all sides, and the bottom of the side plates is formed with a flange edge with bolting holes for easy bolting with the flow equalizing plate and the lower box body.

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