Top and bottom double-channel liquid cooling immersion type battery box

Abstract

The application discloses a top and bottom double-channel liquid cooling immersion type battery box, and relates to the technical field of battery boxes. The application discloses a top and bottom double-channel liquid cooling immersion type battery box, which comprises a top liquid cooling plate, the bottom of the top liquid cooling plate is provided with a plurality of top liquid cooling channels arranged in a bending mode, the ends of the plurality of top liquid cooling channels are fused at a fusion end, and the two fusion ends of the top liquid cooling channels are further provided with a top liquid inlet pipe and a top liquid return pipe in an upwardly communicated mode; the top liquid inlet pipe and the top liquid return pipe are respectively connected with the front panel of the battery box body in a sealed mode through nuts and sealing rings. The application can cool the immersion oil through the top and bottom liquid cooling plates, so that the heat generated by the battery cells can be exchanged with the cooling system to achieve cooling.

Description

Technical Field

[0001] This invention relates to the field of battery thermal management, specifically a top and bottom dual-channel liquid-cooled immersion battery box. Background Technology

[0002] Battery modules generate heat during charging and discharging. Excessive temperature and uneven localized temperature distribution within the battery can severely reduce battery life. Therefore, the heat dissipation performance of the battery module is a crucial factor affecting battery performance, efficiency, lifespan, and safety. Currently, existing liquid-cooled battery pack structures use cooling channels at the bottom for heat dissipation. However, the heat-generating parts of the battery cell are primarily the terminals. This results in a significant temperature difference between the top and bottom of the cell, affecting the uniformity of ion movement between the top and bottom of the battery. This greatly reduces the battery's operating temperature range and the overall energy efficiency of the battery pack, shortens battery life, and may even pose safety hazards.

[0003] The existing battery box has uneven temperature distribution of modules, with localized overheating, which is not conducive to the long-term use of the battery system and cannot guarantee safety and reliability.

[0004] The battery box has low cooling efficiency, and the battery operates within a small temperature range.

[0005] The liquid-cooled battery boxes used in the market only dissipate heat through bottom liquid cooling. The temperature of the cell terminals and aluminum busbars is still too high and they are the main heat sources, resulting in a large temperature difference in the battery box as a whole.

[0006] Existing immersion battery boxes rely on oil circulation for cooling, which has many drawbacks. For example, the circulation path of the oil is complex, there are compatibility issues with seals and other components, and the inherent properties of the materials themselves can lead to oil leakage, making after-sales service difficult and costly. Moreover, the equipment cost for circulating cooling oil is higher, and the volumetric and mass energy density is not high.

[0007] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Summary of the Invention

[0008] The purpose of this invention is to provide a top and bottom dual-channel liquid-cooled immersion battery box to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A top liquid cooling plate is provided with a curved top liquid cooling channel at the bottom of the top liquid cooling plate, and the top liquid cooling channel is connected to a top liquid inlet pipe and a top liquid return pipe; through holes are provided at both ends of the top liquid cooling plate; liquid cooling plate fixing components are provided at both the front and rear positions inside the battery box, and the liquid cooling plate fixing components are fixedly connected to the two ends of the top liquid cooling plate by bolts.

[0011] Furthermore, the top liquid cooling channel is provided with a total of several channels, and the ends of the several top liquid cooling channels are fused together at the fusion end. At the same time, the two fusion ends of the top liquid cooling channel are also connected upward to the top liquid inlet pipe and the top liquid return pipe.

[0012] Furthermore, the top liquid cooling plate comprises an upper plate and a lower plate that are fused together.

[0013] Furthermore, the bottom and sides of the lower plate are directly stamped and formed with a recessed top liquid cooling channel, while the upper plate serves as the top of the top liquid cooling channel.

[0014] Furthermore, the upper and lower plates are directly processed by profile extrusion and brazing processes.

[0015] Furthermore, the upper and lower plates can also be made of plastic, in which case they are extruded and then glued together.

[0016] Furthermore, the liquid cooling plate fixing component includes a movable fixing device, which includes a housing fixing plate and a plate fixing plate. The housing fixing plate is fixedly welded to the inner side of the battery housing. The housing fixing plate has first connecting ears extending downward on both sides of its lower end. One end of the plate fixing plate is fixed to the edge of the top liquid cooling plate by bolts.

[0017] Furthermore, the top liquid cooling plate has a round hole for bolts to pass through, and the plate fixing plate has an oblong hole for bolts to pass through.

[0018] A top-and-bottom dual-channel liquid-cooled immersion battery box is disclosed. A battery module is installed inside the battery box, which is filled with an insulating immersion liquid. The battery module is immersed in the insulating immersion liquid. Simultaneously, liquid-cooled bottom plate outlet pipes and liquid-cooled bottom plate inlet pipes are respectively connected to the left and right sides of the front bottom of the battery box. The liquid-cooled bottom plate outlet pipes and liquid-cooled bottom plate inlet pipes are respectively connected to both ends of a bottom liquid-cooling plate. The bottom liquid-cooling plate can be an independent pipe or integrally formed on the bottom of the battery box. The bottom liquid-cooling plate can have the same structure as the top liquid-cooling plate but be symmetrically arranged, or it can be a liquid-cooling structure as used in existing technologies.

[0019] Furthermore, an insulating sheet is provided on the top of the battery module, which is located below the top liquid cooling plate; the insulating sheet is used to enhance the electrical safety distance between the aluminum busbar of the battery module and the top liquid cooling plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The immersion oil is cooled by top and bottom liquid cooling plates, allowing the heat generated by the battery cells to exchange heat with the cooling system for cooling. This invention enables cooling across the entire module, ensuring thorough and efficient heat exchange and cooling of the immersion oil. This improves overall cooling performance, extends battery life, and enhances safety.

[0022] Meanwhile, the liquid cooling plate fixing components allow the liquid cooling plate to have a certain degree of mobility in both the horizontal and rotational directions, effectively absorbing deformation and warping caused by uneven temperature, reducing internal stress, and protecting welds and sealing surfaces. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a top and bottom dual-channel liquid-cooled immersion battery box (the cover is not shown).

[0024] Figure 2 This is a top view of a dual-channel liquid-cooled immersion battery box with top and bottom channels.

[0025] Figure 3 This is a front view of a top-and-bottom dual-channel liquid-cooled immersion battery box.

[0026] Figure 4 This is a side view of a top-and-bottom dual-channel liquid-cooled immersion battery box.

[0027] Figure 5 This is a schematic diagram of the internal structure of a top-and-bottom dual-channel liquid-cooled immersion battery box.

[0028] Figure 6 for Figure 5 A magnified view of a portion of point a.

[0029] Figure 7 This is a schematic diagram of the bottom structure of the top liquid cooling plate.

[0030] Figure 8 This is a partial structural diagram of the liquid cooling plate fixing component.

[0031] Figure 9 This is an exploded view of the liquid cooling plate fastener.

[0032] Figure 10 This is a schematic diagram of the internal structure of the liquid cooling plate fastener.

[0033] Figure 11 not yet Figure 10 A magnified view of a section at point b. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention 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 the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] Please see Figure 1-4 A top-and-bottom dual-channel liquid-cooled immersion battery box includes a top liquid-cooling plate 100, the bottom of which is provided with a curved top liquid-cooling channel 101.

[0036] In this scheme, there are three top liquid cooling channels 101, and the ends of the three top liquid cooling channels 101 are fused together at the fusion end 104. At the same time, the two fusion ends 104 of the top liquid cooling channels 101 are also connected upward to the top liquid inlet pipe 102 and the top liquid return pipe 103.

[0037] The top liquid inlet pipe 102 and the top liquid return pipe 103 are respectively sealed to the front panel of the battery box 200 by nuts and sealing rings; it is worth noting that the curved parts of the top liquid inlet pipe 102 and the top liquid return pipe 103 are flexible pipes, and the straight parts are rigid pipes.

[0038] In this design, through holes are provided at both ends of the top liquid cooling plate 100; liquid cooling plate fixing parts 400 are provided at both the front and rear positions inside the battery box 200, and the liquid cooling plate fixing parts 400 are fixedly connected to the top liquid cooling plate 100 at both ends by bolts.

[0039] In this solution, the top liquid cooling plate 100 includes an upper plate 110 and a lower plate 120 that are fused together. Specifically, the bottom and side of the top liquid cooling channel 101 are directly stamped and formed on the top of the lower plate 120, while the upper plate 110 serves as the top of the top liquid cooling channel 101.

[0040] In this solution, the upper plate 110 and the lower plate 120 are directly processed by profile extrusion and brazing, which is economical, convenient and has a larger heat exchange area.

[0041] The battery housing 200 houses a battery module 300, which is filled with an insulating immersion liquid. The battery module 300 is immersed in the insulating immersion liquid. Simultaneously, the bottom left and right sides of the front end of the battery housing 200 are respectively connected to a liquid-cooled bottom plate outlet pipe 201 and a liquid-cooled bottom plate inlet pipe 202. The liquid-cooled bottom plate outlet pipe 201 and liquid-cooled bottom plate inlet pipe 202 are respectively connected to both ends of a bottom liquid-cooled plate 203. The bottom liquid-cooled plate 203 can be an independent pipe or integrally formed on the bottom of the battery housing 200. The bottom liquid-cooled plate 203 can have the same structure as the top liquid-cooled plate 100, but be symmetrically arranged vertically, or it can be a liquid-cooling structure as used in the prior art.

[0042] In this design, the liquid cooling base plate outlet pipe 201 and liquid cooling base plate inlet pipe 202 are sealed to the front panel of the battery box 200 by nuts and sealing rings.

[0043] In this solution, an insulating sheet 301 is also provided on the top of the battery module 300, and the insulating sheet 301 is located below the top liquid cooling plate 100; the insulating sheet 301 is used to strengthen the electrical safety distance between the aluminum busbar of the battery module 300 and the top liquid cooling plate 100.

[0044] In this solution, before installing the top liquid cooling plate, insulating fasteners are attached to the module to support the insulating sheet and strengthen the electrical safety distance between the aluminum busbar and the liquid cooling plate. Then, the liquid cooling plate is fixed with liquid cooling plate fasteners 400 to prevent vibration during transportation, etc.

[0045] Meanwhile, in this solution, the liquid cooling plate fixing component 400 includes a movable fixing device 401, which includes a housing fixing plate 402 and a plate fixing plate 403. The housing fixing plate 402 is fixedly welded to the inner side of the battery housing 200. The lower ends of the housing fixing plate 402 are provided with first connecting ears 404 extending downward on both sides. One end of the plate fixing plate 403 is fixed to the edge of the top liquid cooling plate 100 by bolts. Both the plate fixing plate 403 and the top liquid cooling plate 100 are provided with round holes for bolts to pass through. It is worth noting that the round holes of the plate fixing plate 403 are oblong holes. The diameter of the oblong hole is 0.5mm larger than the bolt diameter, and the length of the major axis is 8-12mm. It is worth noting that the plate fixing plate 403 and the top liquid cooling plate 100 can be relatively displaced in the horizontal direction, and have a certain degree of horizontal mobility.

[0046] The other end of the plate fixing plate 403 is bent upward at ninety degrees and is provided with a second connecting ear 405. The second connecting ear 405 and the first connecting ear 404 are rotatably connected by a pin 406.

[0047] Meanwhile, a fan-shaped limiting groove 407 is also provided in the middle of the housing fixing plate 402; and the angle of the fan-shaped limiting groove is 60 degrees; a fan-shaped limiting block 408 is provided on the top of the second connecting ear 405, and the angle of the fan-shaped limiting block 408 is 15 degrees; the limiting block 408 is located in the limiting groove 407, so that the limiting block 408 can have a range of motion of about 45 degrees in the limiting groove 407, that is, rotate about 45 degrees. It is worth noting that the limiting groove 407, the limiting block 408 and the pin 406 are coaxially arranged.

[0048] The conventional plate fixing plate 403 and the top liquid cooling plate 100 can be relatively displaced in the horizontal direction, which can solve the problem of regular expansion of the top liquid cooling plate 100. However, since the problem inside the battery box 200 is not completely uniform, when the top liquid cooling plate 100 deforms and warps due to uneven heating of the battery box 200, the plate fixing plate 403, which can rotate within a certain range, can absorb these deformations and always maintain a low internal stress state, thereby protecting the welds, sealing surfaces and bolt connections.

[0049] After all components are installed, fill the immersion fluid to the designated oil level range, ensuring the fluid covers the liquid cooling plate. Finally, simply close the cover (not shown in the diagram). During operation, the immersion fluid can be cooled. This structure provides better cooling for the battery terminals, which are the heat-generating areas. Combined with the bottom liquid cooling plate, this forms a dual-channel cooling solution, ensuring excellent performance of the battery box during operation.

[0050] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element 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 invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be 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; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A top liquid cooling plate, wherein a curved top liquid cooling channel is provided at the bottom of the top liquid cooling plate, and a top liquid inlet pipe and a top liquid return pipe are connected to the top liquid cooling channel; through holes are provided at both ends of the top liquid cooling plate; liquid cooling plate fixing components are provided at both the front and rear positions inside the battery box, and the liquid cooling plate fixing components are fixedly connected to the front and rear ends of the top liquid cooling plate by bolts.

2. The top liquid cooling plate according to claim 1, characterized in that, The top liquid cooling channel is provided in several ways, and the ends of the several top liquid cooling channels are fused together at the fusion end. At the same time, the two fusion ends of the top liquid cooling channel are also connected upward to the top liquid inlet pipe and the top liquid return pipe.

3. A top liquid cooling plate according to claim 1, characterized in that, The top liquid cooling plate comprises an upper plate and a lower plate that are fused together.

4. A top liquid cooling plate according to claim 3, characterized in that, The bottom and sides of the lower plate are directly stamped and formed with a recessed top liquid cooling channel, while the upper plate serves as the top of the top liquid cooling channel.

5. A top liquid cooling plate according to claim 4, characterized in that, The upper and lower plates are directly processed by profile extrusion and brazing.

6. A top liquid cooling plate according to claim 3, characterized in that, The upper and lower plates can also be made of plastic, in which case they are extruded and then glued together.

7. A top liquid cooling plate according to claim 1, characterized in that, The liquid cooling plate fixing component includes a movable fixing device, which includes a housing fixing plate and a plate fixing plate. The housing fixing plate is fixedly welded to the inner side of the battery housing. The housing fixing plate has first connecting ears extending downward on both sides of its lower end. One end of the plate fixing plate is fixed to the edge of the top liquid cooling plate by bolts.

8. A top liquid cooling plate according to claim 7, characterized in that, The top liquid cooling plate has a round hole for bolts to pass through, and the plate fixing plate has an oblong hole for bolts to pass through.

9. A top-and-bottom dual-channel liquid-cooled immersion battery box, comprising a top liquid-cooling plate as described in any one of claims 1-8, characterized in that, The battery box contains a battery module, which is filled with insulating immersion liquid. The battery module is immersed in the insulating immersion liquid. At the same time, the bottom left and right sides of the front end of the battery box are respectively connected to the liquid cooling plate outlet pipe and the liquid cooling plate inlet pipe. The liquid cooling plate outlet pipe and the liquid cooling plate inlet pipe are respectively connected to the two ends of the bottom liquid cooling plate.

10. A top-and-bottom dual-channel liquid-cooled immersion battery box according to claim 1, characterized in that, An insulating sheet is also provided on the top of the battery module, which is located below the top liquid cooling plate; the insulating sheet is used to enhance the electrical safety distance between the aluminum busbar of the battery module and the top liquid cooling plate.

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