Liquid cooling plate and battery pack

Abstract

The utility model belongs to the field of cooling of secondary batteries, and particularly relates to a liquid cooling plate and a battery pack. In order to improve the cooling effect of the liquid cooling plate, the utility model provides the liquid cooling plate. The liquid cooling plate comprises a flow channel, the flow channel comprises a U-shaped part, the U-shaped part comprises two straight line segments separated by a separation wall and a corner connection segment communicating the two straight line segments, and the separation wall is provided with an overflowing hole communicating the two straight line segments. In actual use, when fluid flows to an inlet of the overflowing hole, fluid resistance borne by the fluid is changed for the first time; when the fluid continues to flow to the switching connection section, the fluid resistance borne by the fluid is changed for the second time; when the fluid continuously flows to the outlet of the overflowing hole, the fluid flowing out of the overflowing hole and the fluid flowing out of the switching connection end are converged together, so that the fluid resistance borne by the fluid is changed for the third time; therefore, the flow passing holes are formed in the partition wall, the fluid boundary can be broken, and the cooling effect of the liquid cooling plate is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the cooling field of secondary battery, in particular to a liquid cooling plate and battery pack. BACKGROUND

[0002] Liquid cooling plates will be used in battery packs to cool battery modules. For example, a Chinese patent application with the application publication number CN117790974A and the application publication date of March 29, 2024 discloses a flange turbulence battery heat exchange plate. The heat exchange plate (i.e., the liquid cooling plate) includes a U-shaped track (i.e., a U-shaped portion). The U-shaped track includes two straight track segments (i.e., straight segments) that are parallel to each other. Each straight track segment has a turbulence boss inside.

[0003] When using the above heat exchange plate, the turbulence boss and the U-shaped track cooperate with each other to make the fluid experience different fluid resistance during flow, thereby breaking the fluid boundary and making the heat exchange plate have better cooling effect.

[0004] In the single U-shaped track of the above heat exchange plate, the two straight track segments are separated by a partition wall. The U-shaped track also includes a corner connecting segment that connects the two straight track segments. When the fluid flows in the above heat exchange plate, the fluid experiences relatively stable fluid resistance at the corner connecting segment, thereby causing the fluid boundary to be relatively stable and affecting the cooling effect of the heat exchange plate. SUMMARY

[0005] The purpose of the utility model is to provide a liquid cooling plate to solve the technical problem that the fluid experiences relatively stable fluid resistance when flowing through the corner connecting segment of the existing heat exchange plate, thereby causing the heat exchange plate to have poor cooling effect.

[0006] The purpose of the utility model is also to provide a battery pack to solve the same technical problem.

[0007] To achieve the above purpose, the technical scheme of the liquid cooling plate provided by the utility model is as follows:

[0008] A liquid cooling plate includes a flow channel. The flow channel includes a U-shaped portion. The U-shaped portion includes two straight segments separated by a partition wall and a corner connecting segment that connects the two straight segments. The partition wall is provided with a flow hole that connects the two straight segments.

[0009] Further, a boss is arranged in the flow channel.

[0010] Further, the boss includes a U-shaped corner boss arranged in the U-shaped portion. The U-shaped corner boss includes end portions located in the two straight segments and a connecting portion connecting the two end portions. The two end portions and the connecting portion jointly form an opening for the partition wall to extend into.

[0011] Further, the flow channel further comprises an L-shaped portion, the L-shaped portion comprising an inflow section and an outflow section perpendicular to each other.

[0012] Further, the boss comprises an L-shaped corner boss arranged in the L-shaped portion, the L-shaped corner boss comprising two parts perpendicular to each other, and two ends of the L-shaped corner boss are arranged in the inflow section and the outflow section respectively.

[0013] Further, the height of the boss is the same as the depth of the flow channel.

[0014] Further, the flow channel is divided into a liquid cooling section and a return section, the liquid cooling section and the return section are arranged in close proximity, the liquid cooling section is used for connecting the liquid inlet nozzle, the return section is used for connecting the liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle are arranged on the same side of the liquid cooling plate in close proximity.

[0015] To achieve the above object, the technical scheme of the battery pack provided by the utility model is:

[0016] A battery pack comprising a battery module and a liquid cooling plate for cooling the battery module, the liquid cooling plate comprising a flow channel, the flow channel comprising a U-shaped portion, the U-shaped portion comprising two straight sections separated by a partition wall and a corner connecting section connecting the two straight sections, and the partition wall is provided with a flow hole communicating the two straight sections.

[0017] Further, a U-shaped corner boss is arranged in the U-shaped portion, the U-shaped corner boss comprising two end portions arranged in the two straight sections and a connecting portion connecting the two end portions, and the two end portions and the connecting portion jointly form an opening for the one end of the partition wall to extend into.

[0018] Further, the flow channel further comprises an L-shaped portion, the L-shaped portion comprising an inflow section and an outflow section perpendicular to each other, an L-shaped corner boss is arranged in the L-shaped portion, the L-shaped corner boss comprising two parts perpendicular to each other, and two ends of the L-shaped corner boss are arranged in the inflow section and the outflow section respectively.

[0019] The liquid cooling plate and the battery pack have the beneficial effects that the utility model discloses an improved invention.The main difference between the utility model and prior art is that a flow hole for connecting two straight line sections is arranged on the partition wall.In actual use, the flow hole can make the two straight line sections conduct in advance, and the fluid resistance experienced by fluid changes for the first time when the fluid flows to the inlet of the flow hole; the fluid resistance experienced by fluid changes for the second time when the fluid continues to flow to the adapter connecting section; the fluid resistance experienced by fluid changes for the third time when the fluid continues to flow to the outlet of the flow hole, and the fluid flowing out of the flow hole and the fluid flowing out of the adapter connecting section converge together, thereby breaking the fluid boundary and improving the cooling effect of the liquid cooling plate, so that the liquid cooling plate can better cool the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the liquid cooling plate of the utility model.

[0021] Mark explanation:

[0022] 1, liquid cooling plate; 11, straight line section; 12, corner connecting section; 13, protrusion; 131, partition wall; 14, flow hole; 15, U-shaped corner boss; 16, L-shaped corner boss; 17, liquid cooling section; 18, backflow section; 2, liquid inlet; 3, liquid outlet. DETAILED DESCRIPTION

[0023] To solve the problems in the background art, the core inventive concept of the utility model is that a flow hole for connecting two straight line sections is arranged on the partition wall, so that the fluid resistance experienced by fluid changes three times, the fluid boundary is broken, and the cooling effect of the liquid cooling plate is improved.

[0024] The utility model will be further described in detail in combination with embodiments.

[0025] The specific embodiment of the liquid cooling plate provided by the utility model is as follows:

[0026] As shown in Figure 1 As the first type of basic specific embodiment, the liquid cooling plate 1 includes a flow channel, and the flow channel includes a U-shaped portion, and the U-shaped portion includes two straight line sections 11 separated by a partition wall 131 and a corner connecting section 12 connecting the two straight line sections 11, and a flow hole 14 connecting the two straight line sections 11 is arranged on the partition wall 131.

[0027] In the first-1 type of specific embodiment, the liquid cooling plate 1 includes an upper plate, a flow channel plate and a lower plate, and the upper plate, the flow channel plate and the lower plate jointly enclose the flow channel, and the flow channel plate is provided with a partition sheet for separating the flow channel, and the part of the partition sheet located in the U-shaped portion constitutes the partition wall 131.

[0028] As Figure 1 shown in the first-2 type embodiment, the liquid cooling plate 1 comprises an upper plate and a lower plate, at this time, a part of the lower plate forms the protrusion 13 for separating the flow channel, the part of the protrusion 13 located in the U-shaped part (i.e. a part of the protrusion 13) constitutes the partition wall 131.

[0029] In the first-1 type and first-2 type embodiments, the forming mode of the flow channel is the prior art, which will not be repeated here. Of course, those skilled in the art can also separate the flow channel in other ways. What the present application emphasizes is that the structure (i.e. the partition piece or the protrusion 13) for separating the flow channel is located in the part of the U-shaped part, which constitutes the partition wall 131.

[0030] In the first-3 type embodiment, the flow channel further comprises an L-shaped part, which comprises an inflow section and an outflow section perpendicular to each other, thereby facilitating the arrangement of the flow channel.

[0031] In the first-4 type embodiment, referring to the Chinese invention patent application with the application publication number CN117790974A, the flow channel only comprises a U-shaped flow channel.

[0032] In the present application, those skilled in the art can design the form of the flow channel according to actual needs, as long as the flow channel has the U-shaped part.

[0033] The main difference between the present application and the prior art is that the partition wall 131 is provided with the flow hole 14 communicating the two straight sections 11. In actual use, the flow hole 14 can make the two straight sections 11 conductive in advance, and the fluid resistance of the fluid changes for the first time when the fluid flows to the inlet of the flow hole 14; when the fluid continues to flow to the adapter connecting section, the fluid resistance of the fluid changes for the second time because the corner connecting section 12 does not have the flow hole 14; when the fluid continues to flow to the outlet of the flow hole 14, the fluid flowing out of the flow hole 14 and the fluid flowing out of the adapter connecting end converge together, resulting in the third change of the fluid resistance of the fluid. In summary, the flow hole 14 arranged on the partition wall 131 can make the fluid resistance of the fluid change three times in the U-shaped part, thereby breaking the fluid boundary and improving the cooling effect of the liquid cooling plate 1.

[0034] On the basis of the first type embodiment, in order to further improve the cooling effect of the liquid cooling plate 1, in the second type embodiment, which is different from the first type embodiment, a boss is arranged in the flow channel, the number of the boss can be one or multiple, and when the number of the boss is multiple, the specific number of different bosses can be the same or different.

[0035] The boss can break the fluid boundary again, and improve the cooling effect of the liquid cooling plate 1. At the same time, compared with the technical solution without the boss in the first type of embodiment, the liquid cooling plate 1 with the boss has a larger contact area with the fluid, thereby further improving the cooling effect of the liquid cooling plate 1.

[0036] It should be noted that within a reasonable range, the longer the length of the boss, the smaller the total work required for the fluid to flow through the entire flow channel, which is beneficial to improve the fluidity of the fluid, thereby further improving the cooling effect of the liquid cooling plate 1.

[0037] Preferably, in the second-1 type of embodiment, the boss includes a U-shaped corner boss 15 arranged in the U-shaped portion, the U-shaped corner boss 15 includes two ends located in the two straight line segments 11 and a connecting portion connecting the two ends, and the two ends and the connecting portion together form an opening for the partition wall 131 to extend into.

[0038] When the fluid flows to one end of the U-shaped corner boss 15, the fluid is blocked by the U-shaped corner boss 15, and the fluid resistance changes. Then, when the fluid flows to the connecting portion of the U-shaped corner boss 15, the fluid resistance changes again. Then, when the fluid flows to the other end of the U-shaped corner boss 15, the two fluids converge together, thereby changing the fluid resistance again. In summary, by arranging the U-shaped corner boss 15, the fluid boundary can be further broken, and the cooling effect of the liquid cooling plate 1 can be improved.

[0039] In the second-2 type of embodiment, when the flow channel further includes an L-shaped portion, the boss includes an L-shaped corner boss 16 arranged in the L-shaped portion, the L-shaped corner boss 16 includes two parts perpendicular to each other, and the two ends of the L-shaped corner boss 16 are located in the inlet flow segment and the outlet flow segment respectively, thereby breaking the fluid boundary and improving the cooling effect of the liquid cooling plate 1.

[0040] Different from the second-1 type of embodiment, in the second-3 type of embodiment, the boss includes a cylindrical boss arranged in the U-shaped portion, thereby breaking the fluid boundary and improving the cooling effect of the liquid cooling plate 1.

[0041] Different from the second-2 type of embodiment, in the second-4 type of embodiment, the boss includes a cylindrical boss arranged in the L-shaped portion, thereby breaking the fluid boundary and improving the cooling effect of the liquid cooling plate 1.

[0042] Compared with the second and third types of specific embodiments and the second and fourth types of specific embodiments, in the second and second types of specific embodiments, whether at the right-angle corner of the flow channel (i.e., the L-shaped part) or at the U-shaped corner of the flow channel (i.e., the U-shaped part), the corner boss is an integral U-shaped corner boss 15 or L-shaped corner boss 16. This helps to reduce the work that the fluid needs to overcome when flowing through the point, and helps to improve the fluid flow, thereby further improving the cooling effect of the liquid cooling plate 1.

[0043] In the second type of specific embodiment, preferably, the height of the boss is the same as the depth of the flow channel, thereby breaking the fluid boundary as much as possible. Of course, the height of the boss can also be less than the depth of the flow channel.

[0044] In the third specific embodiment, referring to the Chinese invention patent application with publication number CN117790974A, the flow channel is a single-loop flow channel, and the fluid in the flow channel cools different battery cells in sequence.

[0045] When using liquid cooling plate 1 to cool the cells in the battery module, the temperature of the fluid entering the flow channel is relatively low at this point, resulting in good cooling effect on the cells. However, as the fluid cools the cells, its temperature gradually rises, leading to a higher temperature in the latter half of the flow channel and poorer cooling effect. Therefore, when using a single-loop liquid cooling plate 1 to cool the battery module, the varying cooling effect of the liquid cooling plate 1 on different cells results in significant temperature differences between the cells, leading to a large variance in the temperature of all cells and hindering the maintenance of cell consistency.

[0046] To better maintain cell consistency, in a preferred fourth embodiment, such as... Figure 1 As shown, the flow channel is a dual-loop flow channel, which is divided into a liquid cooling section 17 and a reflux section 18. The liquid cooling section 17 and the reflux section 18 are arranged adjacent to each other. The liquid cooling section 17 is used to connect the liquid inlet nozzle 2, and the reflux section 18 is used to connect the liquid outlet nozzle 3. The liquid inlet nozzle 2 and the liquid outlet nozzle 3 are located on the same side of the liquid cooling plate 1 and are arranged adjacent to each other.

[0047] When using the liquid cooling plate 1 to cool the cells in the battery module, the liquid cooling section 17 and the recirculation section 18 simultaneously cool the same cell. At this time, the cooling effect of the liquid cooling plate 1 on different cells is basically the same, which can reduce the variance of the temperature of all cells and better maintain the consistency of the cells.

[0048] Specific embodiments of the battery pack provided by this utility model:

[0049] The battery pack comprises a battery module and a liquid cooling plate 1 for cooling the battery module, the specific structure of the liquid cooling plate 1 is the same as that of any one of the specific structures of the liquid cooling plate 1 in the specific embodiments of the utility model, and details are not repeated here.

[0050] It should be noted that the specific embodiments in the utility model are only classified according to specific structures, and it does not mean that other categories do not contain this specific structure. For example, the structure of the first type of specific embodiment may be the same as that of the third or fourth type of specific embodiment, and the structure of the second type of specific embodiment may also be the same as that of the third or fourth type of specific embodiment.

[0051] Finally, it should be noted that the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments without paying creative labor, or make equivalent replacement to part of the technical features, or organically combine different types of specific embodiments, so as to combine the utility model out of the attached Figure 1 The specific embodiments given in the specification, of course, those skilled in the art can also combine the specific embodiments not given in the specification and drawings. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A liquid cooling plate comprising a flow channel, the flow channel comprising a U-shaped portion, the U-shaped portion comprising two straight sections separated by a partition wall and a corner connecting section connecting the two straight sections, characterized in that, The partition wall is provided with a flow hole connecting the two straight sections.

2. The liquid cold plate of claim 1, wherein, The flow channel is provided with a boss.

3. The liquid cold plate of claim 2, wherein, The boss comprises a U-shaped corner boss arranged in the U-shaped section, the U-shaped corner boss comprises two ends arranged in the two straight sections and a connecting section connecting the two ends, and the two ends and the connecting section jointly form an opening for the partition wall to extend into.

4. The liquid cold plate of claim 2, wherein, The flow channel further comprises an L-shaped section, the L-shaped section comprises an inflow section and an outflow section perpendicular to each other.

5. The liquid cold plate of claim 4, wherein, The boss comprises an L-shaped corner boss arranged in the L-shaped section, the L-shaped corner boss comprises two parts perpendicular to each other, and two ends of the L-shaped corner boss are arranged in the inflow section and the outflow section respectively.

6. The liquid cold plate of any of claims 2-5, wherein, The height of the boss is the same as the depth of the flow channel.

7. The liquid cold plate of any of claims 1-5, wherein, The flow channel is divided into a liquid cooling section and a backflow section, the liquid cooling section and the backflow section are arranged in close proximity, the liquid cooling section is used for connecting the liquid inlet nozzle, the backflow section is used for connecting the liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle are arranged on the same side of the liquid cooling plate in close proximity.

8. A battery pack comprising a battery module and a liquid cooling plate for cooling the battery module, the liquid cooling plate comprising a flow channel, the flow channel comprising a U-shaped portion, the U-shaped portion comprising two straight segments separated by a partition wall and a corner connecting segment connecting the two straight segments, characterized in that, The partition wall is provided with a flow hole connecting the two straight sections.

9. The battery pack of claim 8, wherein, The U-shaped section is provided with a U-shaped corner boss, the U-shaped corner boss comprises two ends arranged in the two straight sections and a connecting section connecting the two ends, and the two ends and the connecting section jointly form an opening for the partition wall to extend into.

10. The battery pack of claim 8, wherein, The flow channel further comprises an L-shaped section, the L-shaped section comprises an inflow section and an outflow section perpendicular to each other, the L-shaped section is provided with an L-shaped corner boss, the L-shaped corner boss comprises two parts perpendicular to each other, and two ends of the L-shaped corner boss are arranged in the inflow section and the outflow section respectively.

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