Liquid cooling plate and battery pack

Abstract

The utility model provides a liquid cooling plate and a battery pack. The liquid cooling plate comprises a first plate body, a second plate body and a third plate body, the first plate body, the second plate body and the third plate body are sequentially stacked, and flow channels for cooling liquid to pass through are formed between the first plate body and the second plate body and between the second plate body and the third plate body. The outer surface, away from the second plate body, of the first plate body and the outer surface, away from the second plate body, of the third plate body are flat faces. According to the utility model, the problem of poor heat exchange effect of the liquid cooling plate in the prior art is solved, and the liquid cooling plate runner design with more efficient heat exchange effect is provided.

Description

Technical Field

[0001] The utility model relates to the field of battery thermal management, and in particular to a liquid cooling plate and a battery pack. Background Art

[0002] Liquid cooling plates effectively transfer heat through forced convection of internal fluid, allowing high heat load equipment to operate stably. Liquid cooling plates are particularly popular in high-performance computers, servers, and electric vehicle battery management systems. Although current liquid cooling plates have a variety of designs and good heat transfer performance, they cannot meet the needs of specific applications and have the following limitations:

[0003] The traditional stamped liquid cooling plate uses physical stamping to determine the flow channel of the liquid cooling plate, which causes depressions in the liquid cooling plate, thereby inevitably reducing the contact area between the liquid cooling plate and the heat exchange object. This results in incomplete contact with the heat exchange object (the depressed side is the flow channel, and the protruding part is in contact with the heat exchange object), which causes structural instability and the two cannot fit tightly, thereby increasing the contact thermal resistance and ultimately reducing the heat exchange efficiency.

[0004] In summary, liquid cooling plates, as an efficient thermal management solution, play an important role in many fields. However, current heat exchange plates have problems such as small heat exchange area and poor structural stability. Utility Model Content

[0005] The main purpose of the utility model is to provide a liquid cooling plate and a battery pack to solve the problem of poor heat exchange effect of the liquid cooling plate in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a liquid cooling plate is provided, including a first plate body, a second plate body, and a third plate body. The first plate body, the second plate body and the third plate body are stacked in sequence, and flow channels for cooling liquid to pass through are formed between the first plate body and the second plate body, and between the second plate body and the third plate body. The outer surface of the first plate body away from the second plate body and the outer surface of the third plate body away from the second plate body are both flat surfaces of the battery.

[0007] Furthermore, the first plate body and / or the third plate body integrally protrudes in a direction away from the second plate body to form a flow channel between the second plate body, and the integrally protruding portion of the first plate body and / or the third plate body forms a flat surface.

[0008] Furthermore, the flow channel between the second plate body and the first plate body is the first flow channel, the flow channel between the second plate body and the third plate body is the second flow channel, the second plate body has a flow hole arranged through it, and the first flow channel and the second flow channel are connected through the flow hole.

[0009] Furthermore, the flow channel includes an input section, multiple first diversion sections, a common section, multiple second diversion sections, and an output section. Both ends of each first diversion section are respectively connected to the input section and the common section, and the first diversion sections are arranged in parallel. Both ends of each second diversion section are respectively connected to the common section and the output section, and the second diversion sections are arranged in parallel.

[0010] Furthermore, at least one of the input section, the first flow diversion section, and the second flow diversion section is provided with a flow hole.

[0011] Furthermore, the second plate body has a convex rib, the convex rib divides the flow channel and forms a first flow diversion section and / or a second flow diversion section, and the flow hole is located at the end of the convex rib.

[0012] Furthermore, the convex rib protrudes toward the first flow channel and separates the first flow channel to form first flow diversion sections or second flow diversion sections, and the convex rib is recessed on one side of the second flow channel and forms the second flow diversion section or the first flow diversion section of the second flow channel.

[0013] Furthermore, at least one of the first plate body, the second plate body, and the third plate body has a recessed portion at its edge, and the recessed portion is sunken in a direction close to the flow channel, so that the flow channel forms a bayonet with a reduced flow area.

[0014] Furthermore, the first plate body, the second plate body and the third plate body all have an extension portion located outside the battery pack, and the first plate body and the third plate body have a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both located in the extension portion.

[0015] According to another aspect of the utility model, a battery pack is provided, comprising a plurality of battery boxes and at least one battery group, wherein the battery box comprises the above-mentioned liquid cooling plate, the battery is arranged in the battery box, the battery group comprises a plurality of batteries stacked on each other, and a liquid cooling plate is arranged between adjacent battery groups.

[0016] By applying the technical solution of the utility model, a flow channel for the cooling liquid to pass through is formed by setting the second plate body, the first plate body and the third plate body respectively, and the outer surface of the first plate body away from the second plate body and the outer surface of the third plate body away from the second plate body are set as flat surfaces, so that the surface of the liquid cooling plate in contact with the battery for heat exchange is a flat surface with a large contact area, and can be in full contact with the battery, thereby improving the heat exchange efficiency and achieving a better heat exchange effect. Specifically, the second plate body is set between the first plate body and the third plate body. On the one hand, the cooling liquid passes through the flow channel between the first plate body and the second plate body, so that the first plate body The outer surface of the plate body away from the second plate body can contact the battery, thereby realizing heat exchange. On the other hand, the coolant passes through the flow channel between the second plate body and the third plate body, so that the outer surface of the third plate body away from the second plate body can contact the battery, thereby realizing heat exchange. At the same time, the surface in contact with the battery is set to a flat surface so that it is in full contact with the battery, which can increase the contact area between the plate body and the battery and realize large-area contact with the battery, thereby increasing the heat exchange area between the liquid cooling plate and the battery. In this way, the liquid cooling plate realizes double-sided heat exchange with the battery, thereby improving the heat exchange efficiency and achieving better heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A partial structural schematic diagram of a liquid cooling plate of the utility model is shown;

[0019] Figure 2 An exploded view of a liquid cooling plate is shown;

[0020] Figure 3 A schematic structural diagram of a first plate body is shown;

[0021] Figure 4 shows a schematic structural diagram of the second plate body;

[0022] Figure 5 shows a schematic structural diagram of a third plate body;

[0023] Figure 6 A schematic diagram of the structure of the battery pack and the liquid cooling plate is shown;

[0024] Figure 7 A schematic diagram of the structure of a battery pack is shown.

[0025] The above drawings include the following reference numerals:

[0026] 10. First plate body; 20. Second plate body; 21. Flow hole; 22. Raised rib; 30. Third plate body; 40. Flow channel; 41. Input section; 42. First flow diversion section; 43. Common section; 44. Second flow diversion section; 45. Output section; 50. Concave portion; 60. Battery; 70. Box frame; 80. Liquid cooling pipeline assembly; 90. Reinforcement plate. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0030] In order to solve the problem of poor heat exchange effect of the liquid cooling plate in the prior art, the utility model provides a liquid cooling plate and a battery pack.

[0031] like Figures 1 to 6 A liquid cooling plate shown includes a first plate body 10, a second plate body 20, and a third plate body 30. The first plate body 10, the second plate body 20, and the third plate body 30 are stacked in sequence, and a flow channel 40 for cooling liquid to pass through is formed between the first plate body 10 and the second plate body 20, and between the second plate body 20 and the third plate body 30. The outer surface of the first plate body 10 away from the second plate body 20 and the outer surface of the third plate body 30 away from the second plate body 20 are both flat surfaces.

[0032] In this embodiment, the second plate body 20 is provided with the first plate body 10 and the third plate body 30 to form a flow channel 40 through which the cooling liquid passes, and the outer surface of the first plate body 10 away from the second plate body 20 and the outer surface of the third plate body 30 away from the second plate body 20 are set to be flat surfaces, so that the surface of the liquid cooling plate in contact with the battery 60 for heat exchange is a flat surface with a large contact area, and can be in full contact with the battery 60, thereby improving the heat exchange efficiency and achieving a better heat exchange effect. Specifically, the second plate body 20 is provided between the first plate body 10 and the third plate body 30. On the one hand, the cooling liquid passes through the flow channel 40 between the first plate body 10 and the second plate body 20, so that the first plate body 10 is away from The outer surface of the second plate body 20 can contact the battery 60 to achieve heat exchange. On the other hand, the cooling liquid passes through the flow channel 40 between the second plate body 20 and the third plate body 30, so that the outer surface of the third plate body 30 away from the second plate body 20 can contact the battery 60 to achieve heat exchange. At the same time, the surface in contact with the battery 60 is set to a flat surface so that it is in full contact with the battery 60, which can increase the contact area between the plate body and the battery 60 and achieve a large area contact with the battery 60, thereby increasing the heat exchange area between the liquid cooling plate and the battery 60. In this way, the liquid cooling plate achieves a large area heat exchange with the battery 60 on both sides, thereby improving the heat exchange efficiency and achieving a better heat exchange effect.

[0033] like Figure 1 As shown, the edges of the first plate 10 and the third plate 30 are respectively fixed to the two opposite edges of the second plate 20, as shown in FIG. Figure 2 As shown, the first plate body 10 and the third plate body 30 are respectively arranged on both sides of the second plate body 20, and the three plates are closely fitted to ensure that the thickness of the liquid cooling plate meets the space requirements.

[0034] Optionally, the first plate body 10 and / or the third plate body 30 protrude as a whole in a direction away from the second plate body 20 to form a flow channel 40 between the second plate body 20. In this embodiment, both the first plate body 10 and the third plate body 30 protrude in a direction away from the second plate body 20, that is, with the second plate body 20 as the center, the first plate body 10 protrudes as a whole in a direction away from the second plate body 20. It should be noted that the overall protrusion mentioned here refers to the middle part of the first plate body 10 and the third plate body 30 protruding in a direction away from the second plate body 20, and the protruding part is continuous and uninterrupted, so as to ensure that the protrusion forms a large flat surface without forming multiple small protrusions at intervals. As for the edges of the first plate body 10 and the third plate body 30, considering the need to connect with the second plate body 20, the edges do not need to protrude. In this way, the first plate body 10 protrudes as a whole in a direction away from the second plate body 20, resulting in a large area cavity formed between the middle position of the first plate body 10 and the second plate body 20, so as to set the flow channel 40 and ensure that the space occupied by the flow channel 40 in the liquid cooling plate. Similarly, the third plate body 30 protrudes as a whole in a direction away from the second plate body 20, and a cavity is also formed between the third plate body 30 and the second plate body 20, and the flow channel 40 is set; wherein the flow channel 40 can be an integral cavity shape, for example, the coolant flows from one end of the liquid cooling plate to the other end of the liquid cooling plate, or it can be an S-shaped or other spiral channel, where the coolant starts from one end of the liquid cooling plate, passes through the S-shaped flow channel, and then flows out from one end or the other end of the liquid cooling plate, etc. In this embodiment, a spiral winding channel is preferably used to ensure the heat exchange effect. At this time, the flow channel 40 can be realized by setting a partition in the cavity. This facilitates the formation of the flow channels 40 on both sides on the one hand, and makes the processing simpler and more unified on the other hand. The above-mentioned setting method forms a double-sided liquid cooling plate by forming a flow channel 40 between the first plate body 10 and the second plate body 20, and between the second plate body 20 and the third plate body 30, thereby improving the heat exchange effect. At the same time, the protruding parts of the first plate body 10 and the third plate body 30 form a flat surface, that is, the surface of the first plate body 10 and the third plate body 30 for contacting the surface of the battery 60 is set to a plane. Compared with the concave and convex surface in the prior art, the contact area with the surface of the battery 60 can be expanded to achieve a better heat exchange effect. In other possible embodiments, only one of the first plate body 10 and the third plate body 30 may adopt the above-mentioned overall protruding setting method, and the other plate body may adopt a flat plate structure. In this case, a concave-convex structure such as ribs can be set on the second plate body 20, and the flow channel 40 is formed by the cooperation between the ribs and the other plate body. If necessary, the other plate body and the second plate body can be sealed by setting a seal. Specifically, since the flat plate structure may make the two ends of the plate body in the length direction connected to the outside, in this case, the flow channel 40 can be enclosed in the plate body by setting ribs of the second plate body 20 or by setting a seal, and it is only connected to the outside through the liquid inlet and the liquid outlet to avoid leakage of the coolant.

[0035] like Figure 4 As shown, in this embodiment, the flow channel 40 between the second plate body 20 and the first plate body 10 is the first flow channel, and the flow channel 40 between the second plate body 20 and the third plate body 30 is the second flow channel. In this embodiment, only the first plate body 10 is provided with a liquid inlet and a liquid outlet for the coolant, and the second plate body 20 has a flow hole 21 that is arranged through, so that the first flow channel and the second flow channel are connected through the flow hole 21. When the coolant in the first flow channel flows to the flow hole 21, due to the effect of the flow hole 21, the coolant can flow to the second flow channel, thereby diverting the coolant to the two flow channels 40, thereby achieving the effect of double-sided liquid cooling. Similarly, when the coolant in the second flow channel flows through the flow hole 21, due to the effect of the flow hole 21, the coolant can also flow to the first flow channel, thereby achieving the effect of double-sided liquid cooling. Moreover, the coolant in the two flow channels 40 flows between each other, which can balance the coolant temperature in the two flow channels 40, making the liquid cooling effect more uniform and stable. Of course, the flow hole 21 may not be provided, but the flow channels 40 on both sides may be provided in a mutually independent form, that is, the flow channels 40 on both sides are not connected to each other. In this case, in addition to providing the coolant inlet and outlet on the first plate body 10, the coolant inlet and outlet are also provided on the third plate body 30, so that the coolant in the first flow channel flows in and out from the inlet and outlet of the first plate body 10, and the coolant in the second flow channel flows in and out from the inlet and outlet of the third plate body 30. In this way, the coolants in the two flow channels 40 are not connected, and the flow of the coolant is realized through their respective inlets and outlets, thereby achieving a liquid cooling effect.

[0036] In this embodiment, the flow channel 40 includes an input section 41, a plurality of first diversion sections 42, a common section 43, a plurality of second diversion sections 44, and an output section 45. Both ends of each first diversion section 42 are respectively connected to the input section 41 and the common section 43, and each first diversion section 42 is arranged in parallel. Both ends of each second diversion section 44 are respectively connected to the common section 43 and the output section 45, and each second diversion section 44 is arranged in parallel. Specifically, when the coolant flows in the flow channel, the coolant enters the flow channel 40 from the input section 41, and then diverts to each first diversion section 42, and then converges from the liquid outlet end of each first diversion section 42, uniformly passes through the common section 43, and then diverts from the common section 43 to each second diversion section 44, and finally converges from the second diversion section 44 to the output section 45, and is uniformly discharged from the flow channel 40 from the output section 45. In this way, it is beneficial for the coolant to cover most of the surface of the plate body and improve the heat exchange effect.

[0037] Optionally, the two flow channels 40 on both sides of the second plate body 20 may be completely identical or may be unequal. This embodiment adopts the latter, and the two flow channels 40 on both sides of the second plate body 20 of this embodiment adopt a partially complementary relationship, that is, one side is a protrusion and the other side is a groove, which is conducive to reducing the overall thickness, and the staggered arrangement of the protrusions and grooves improves the overall strength and pressure resistance of the liquid cooling plate, thereby meeting the use requirements of a narrow space.

[0038] The flow holes 21 of this embodiment are mainly arranged at the input section 41, the first diversion section 42, and the second diversion section 44 to ensure that the coolant circulates in the flow channels 40 on both sides to achieve a double-sided liquid cooling effect. Of course, the flow holes 21 can also be arranged at other positions of the flow channels 40, as long as the connection between the flow channels 40 on both sides can be met to realize the flow of the coolant between the flow channels 40 on both sides. Specifically, the flow holes 21 play a diversion role in the flow of the coolant, so that the coolant flowing in the flow channel 40 on one side flows to the flow channel 40 on the other side through the flow holes 21. In this embodiment, the flow holes 21 are respectively arranged at the front end and end of the input section 41, the first diversion section 42, and the front end and end of the second diversion section 44 to realize the flow of the coolant in the flow channels 40 on both sides. The front end and the end mentioned here are the two ends in sequence along the flow direction of the coolant, that is, the front end is the starting diversion end, and the end is the terminating converging end. As Figure 4 As shown, the flow hole 21 of the input section 41 and the flow hole 21 of the first diversion section 42 divert the coolant in the flow channel 40 on one side to the flow channel 40 on the other side, so that the flow channels 40 on both sides are connected together through the flow holes 21. In this way, it is only necessary to set a liquid inlet and a liquid outlet on one plate body for the introduction of coolant to realize the flow of coolant in the flow channels 40 on both sides. Of course, the flow hole 21 may be provided at only one or two places of the input section 41 or the first diversion section 42, the second diversion section 44. For example, the flow hole 21 may be provided at only the input section 41. In this way, the coolant flows to the first flow channel and the second flow channel through the flow hole 21. Accordingly, liquid outlets need to be provided at the first plate body 10 and the third plate body 30 respectively, so that the coolant in the first flow channel and the second flow channel flows out from the liquid outlets of the first plate body 10 and the third plate body 30 respectively. Compared with the setting method of the present embodiment, the method of providing the flow hole 21 at only one place can also achieve the effect of double-sided liquid cooling, but the circulation effect of the coolant in the first flow channel and the second flow channel is poor.

[0039] Based on the above explanation, the flow channel 40 of this embodiment is essentially formed by the concave-convex structure of the second plate body 20. Specifically, the second plate body 20 has a convex rib 22, which separates the flow channel 40 and forms a first diversion section 42 and / or a second diversion section 44. The flow hole 21 is located at the end of the convex rib 22.

[0040] Specifically, for the sake of convenience, the side of the second plate body 20 facing the first plate body 10 is called the first side, and the side of the second plate body 20 facing the third plate body 30 is called the second side. For the first side, a concave portion is provided on the surface of the first side, and a convex rib 22 is provided in the concave portion of the first side. When the first plate body 10 and the second plate body 20 are bonded and connected, the convex rib 22 of the first side is bonded with the first plate body 10, and at this time, a flow channel 40 is formed between the concave portion of the first side and the first plate body 10. Specifically, for the convenience of description, the convex rib 22 is divided into three types according to its different setting positions and functions; one type of convex rib 22 is a convex rib 22 that separates and forms a first diversion section area and a second diversion section area. In order to facilitate the explanation of the subsequent flow channel 40, this part of the convex rib 22 is called a partition convex rib, and the partition convex rib divides the aforementioned recessed area into two parts in the recessed portion, and these two parts are the first diversion section area and the second diversion section area. The coolant flow direction in the first diversion section area is opposite to the coolant flow direction in the second diversion section area. It should be noted that the partition convex rib does not completely separate the two areas, and it leaves a certain distance for the coolant to pass through, and the remaining area is the common section 43; another type of convex rib 22 is a convex rib 22 that separates and forms each first diversion section 42, and is called a first convex rib. The first convex rib is in the partition The first diversion section area formed by the convex rib is further divided to form a plurality of parallel first diversion sections 42. After the coolant enters from the input section 41, it enters the plurality of first diversion sections 42 in parallel. By connecting the plurality of first diversion sections 42 in parallel, the liquid cooling flow path can be shortened and the heat dissipation efficiency can be improved. Another type of convex rib 22 is a convex rib 22 that separates and forms a second diversion section 44, called a second convex rib. The second convex rib is in the second diversion section area formed by the partition convex rib, and the second diversion section area is further divided to form a plurality of parallel second diversion sections 44. The coolant in the plurality of first diversion sections 42 respectively enters the plurality of parallel second diversion sections 44 after passing through the common section 43, and then flows from the second diversion section 44 to the output section 45, and is output to the liquid cooling pipeline assembly and connected to the external cooling pipeline. In this way, the first diversion section 42, the second diversion section 44, the common section 43, etc. can be formed on the first side of the second plate body 20.

[0041] On the second side of the second plate body 20, based on the structural form of the aforementioned first side, the convex rib 22 of the first side forms a groove at the corresponding position on the second side, and the groove of the first side forms a convex rib at the corresponding position on the second side, so that the flow channel 40 on the second side is essentially a multi-groove structure, wherein a groove is formed on the back side of the position corresponding to the convex rib between the input section 41 and the output section 45 of the first side as the input section 41 of the second side, and the groove corresponding to the partition convex rib of the first side is connected to the input side of the second side, and the first convex rib and the second convex rib on the first side respectively form the first diversion section 42 and the second diversion section 44 on the second side, and the connection between the first diversion section 42 on both sides and the second diversion section 44 on both sides is realized through the flow hole 21, and the coolant flows out from the second diversion section 44 through the flow hole 21 and then enters the output section 45 of the first side and flows out.

[0042] Based on the above-mentioned structural form, the overall flow path of the coolant in this embodiment is as follows: the coolant is passed into the input section 41 of the first side through the liquid inlet of the first plate body 10. In the input section 41 of the first side, part of the coolant enters the input section 41 of the second side through the flow hole 21 of the input section 41. Most of the coolant continues to flow in the flow channel 40 in the first side and is diverted to each first diverter section 42 at the front end of the first diverter section 42. At the same time, part of the coolant enters the first diverter section 42 on the second side through the flow hole 21 at the end of the rib 22. The coolant flows simultaneously in the first diverter sections 42 on both sides until the end of the first diverter section 42. The coolant on the first side converges at the end of the first diverter section 42, and the coolant on the second side also converges to the flow hole 21 of the rib 22. At the end of the first diverter section 42 on the first side, at the same time, the coolant in the input section 41 on the second side also converges to the end of the first diverter section 42 on the first side through the end of the groove corresponding to the partition rib on the first side through the flow hole 21, and the coolant passes through the common section 43 uniformly, and then at the front end of the second diverter section 44 on the first side, part of the coolant is diverted to each second diverter section 44 on the first side, and the other part of the coolant enters the second diverter section 44 on the second side through the flow hole 21, and the coolant flows simultaneously in the second diverter sections 44 on both sides until at the end of the second diverter section 44, the coolant on the first side converges at the end of the second diverter section 44, and the coolant on the second side converges to the end of the second diverter section 44 on the first side through the flow hole 21, and then the coolant passes through the output section 45 and is discharged from the liquid outlet. In essence, the above-mentioned setting method is that the first flow channel and the second flow channel share the output section 45 and part of the input section 41, thereby reducing the complexity of the structure and improving the coolant circulation effect in the two flow channels 40.

[0043] It should be noted that the specific structural form of the flow channel is not limited to the above-mentioned setting method of this embodiment. The structural form of the flow channel 40 can be adjusted as needed, as long as the coolant can flow and achieve heat exchange. For example, the form of the protrusion on one side of the rib 22 of this embodiment as the groove on the other side can be replaced by a form in which only one side is protruded and the other side has no groove. At this time, a rib, a partition and other structures need to be separately arranged on the side without the groove to form the flow channel; or it can be replaced by a form in which protrusions are arranged on both sides of the second plate body 20, and the protrusions on each side are arranged at intervals. The protrusions on both sides can be arranged symmetrically, that is, protrusions are arranged at the corresponding positions on both sides at the same time or no protrusions are arranged at the same time. In this way, the flow channels 40 on both sides are completely identical and symmetrical.

[0044] In this embodiment, the overall flow direction of the flow channel 40 is not to flow in one direction all the time, but to adopt a swirling setting, that is, the flow channel 40 first extends a distance in one direction, then bends and extends in the opposite direction, so that the overall length can be reduced, and at the same time, the range of the flow channel 40 covering the surface of the plate body is increased, ensuring that most of the side surfaces of the plate body are covered by the flow channel, thereby improving the heat exchange effect. Of course, when the size of the plate body increases, the flow channel 40 can further swirl to form an S-shaped setting.

[0045] Due to the above arrangement, the liquid inlet and the liquid outlet of this embodiment are located on the same side of the length direction of the first plate body 10, that is, Figure 4 Because the liquid inlet and outlet are arranged on the same side, the first plate body 10, the second plate body 20 and the third plate body 30 are provided with a protruding portion on one side in the length direction in this embodiment. The protruding portion is located on the short side of the plate body and protrudes a part, and the protruding portion is located outside the battery pack. The liquid inlet and the liquid outlet are located at the protruding portion. In this way, when the liquid cooling plate is matched with the battery, the protruding portion can be exposed in the gap between the batteries, so as to facilitate the connection of the pipeline.

[0046] In this embodiment, at least one of the first plate body 10, the second plate body 20, and the third plate body 30 has a recess 50 at its edge, and the recess 50 is recessed in the direction close to the flow channel 40, so that the flow channel 40 forms a bayonet with a reduced flow area. The setting of the bayonet allows the coolant to flow through the flow channel 40 at a more uniform flow rate when flowing in the flow channel 40, thereby achieving a better heat exchange effect. At the same time, when the liquid cooling plate is set in the battery box, glue can also be injected between the liquid cooling plate and the side of the battery pack through the buckle.

[0047] Preferably, in this embodiment, bayonet holes are respectively provided at the side edges of the plate body near the first diversion section 42 and the output section 45. The bayonet holes are provided at these positions because the coolant flow rate in these two parts is relatively fast and the requirement for a stable coolant deceleration is relatively high, so this setting method is adopted. More specifically, the bayonet holes are located at the edge of the plate body, so that it is easy to set and does not affect the flow channel structure inside the plate body. Of course, in addition to the bayonet holes provided at the above-mentioned positions, bayonet holes can also be provided at other positions of the flow channel 40, such as the second diversion section 44 or the input section 41.

[0048] Preferably, if Figure 2 , Figure 4 , Figure 5 As shown, recesses 50 are provided at corresponding positions of the first diversion section 42 and the output section 45 of the first plate body 10, the second plate body 20, and the third plate body 30 to make them fit tightly to control the liquid inlet flow rate and the liquid outlet flow rate, making the flow rate more uniform and making the heat exchange effect more uniform and stable.

[0049] It should be noted that the structures of the first plate 10 and the third plate 30 of this embodiment and the matching forms with the second plate 20 can be interchanged. That is, the first plate 10 can also be used as the third plate, and the third plate 30 can also be used as the first plate 10.

[0050] like Figure 7 As shown, an embodiment of the present application also provides a battery box, which includes a box frame 70, a reinforcing plate 90, the above-mentioned liquid cooling plate and a liquid cooling pipe assembly 80. The box frame 70 encloses the base part of the battery box, and the middle part thereof has a large space. The reinforcing plate 90 is erected in the box frame 70 along the first direction, and the box frame 70 is divided into a first accommodating space and a second accommodating space. The first accommodating space is used to accommodate a battery pack. At least a portion of the liquid cooling plate is erected in the first accommodating space along the second direction, and the second direction is perpendicular to the first direction. The above-mentioned first direction and second direction are the width direction and length direction of the battery pack, respectively. The liquid cooling pipe assembly 80 is arranged in the second accommodating space and is connected to the liquid cooling plate to achieve the effect of supplying liquid to the flow channel 40.

[0051] like Figure 6 , Figure 7 As shown, the present embodiment further provides a battery pack, which includes a battery box and at least one battery group, the battery box includes the above-mentioned liquid cooling plate, the battery group is arranged in the battery box, the battery pack includes a plurality of batteries 60 stacked on each other, the batteries 60 are grouped and arranged in parallel to form a battery pack, and liquid cooling plates can be arranged between adjacent battery groups and between the battery group and the battery box. In this way, the liquid cooling plate is located on the side of the battery pack and contacts the battery 60 for heat conduction, so that the liquid cooling plate can exchange heat with the batteries 60 on both sides at the same time, realizing double-sided liquid cooling, thereby improving the heat exchange effect.

[0052] It should be noted that, the multiple in the above embodiments refers to at least two.

[0053] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0054] 1. Double-sided liquid cooling is achieved through the double-sided liquid cooling plate, and the setting of the flat surface solves the problem of poor heat exchange effect of the liquid cooling plate in the prior art;

[0055] 2. The two outer surfaces of the liquid cooling plate are set as planes to achieve heat exchange with the entire contact area of ​​the battery, thereby improving the heat exchange efficiency and achieving better heat exchange effect;

[0056] 3. The overall strength and pressure resistance of the liquid cooling plate are improved by staggered arrangement of protrusions and grooves, thus meeting the use requirements of narrow spaces.

[0057] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0060] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A liquid cooling plate, characterized in that: include: A first plate (10); A second plate (20); A third plate body (30), wherein the first plate body (10), the second plate body (20) and the third plate body (30) are stacked in sequence, and a flow channel (40) for cooling liquid to pass through is formed between the first plate body (10) and the second plate body (20), and between the second plate body (20) and the third plate body (30), and the outer surface of the first plate body (10) away from the second plate body (20) and the outer surface of the third plate body (30) away from the second plate body (20) are both flat surfaces.

2. The liquid cooling plate according to claim 1, characterized in that: The first plate body (10) and / or the third plate body (30) protrude as a whole in a direction away from the second plate body (20) so as to form the flow channel (40) between the second plate body (20), and the protruding portion of the first plate body (10) and / or the third plate body (30) as a whole forms the flat surface.

3. The liquid cooling plate according to claim 1, characterized in that: The flow channel (40) between the second plate body (20) and the first plate body (10) is a first flow channel, and the flow channel (40) between the second plate body (20) and the third plate body (30) is a second flow channel. The second plate body (20) has a flow hole (21) extending therethrough, and the first flow channel and the second flow channel are connected via the flow hole (21).

4. The liquid cooling plate according to claim 3, characterized in that: The flow channel (40) comprises an input section (41), a plurality of first flow diversion sections (42), a common section (43), a plurality of second flow diversion sections (44), and an output section (45); both ends of each of the first flow diversion sections (42) are respectively connected to the input section (41) and the common section (43), and the first flow diversion sections (42) are arranged in parallel; both ends of each of the second flow diversion sections (44) are respectively connected to the common section (43) and the output section (45), and the second flow diversion sections (44) are arranged in parallel.

5. The liquid cooling plate according to claim 4, characterized in that: The flow hole (21) is provided at least one of the input section (41), the first flow dividing section (42), and the second flow dividing section (44).

6. The liquid cooling plate according to claim 5, characterized in that: The second plate body (20) has a convex rib (22), the convex rib (22) divides the flow channel (40) and forms the first flow diversion section (42) and / or the second flow diversion section (44), and the flow hole (21) is located at the end of the convex rib (22).

7. The liquid cooling plate according to claim 6, characterized in that: The convex rib (22) protrudes toward the first flow channel and divides the first flow channel to form each first flow branch section (42) or each second flow branch section (44); the convex rib (22) is located on one side of the second flow channel and is recessed to form the second flow branch section (44) or the first flow branch section (42) of the second flow channel.

8. The liquid cooling plate according to claim 1, characterized in that: At least one of the first plate body (10), the second plate body (20) and the third plate body (30) has a recess (50) at its edge, and the recess (50) is recessed in a direction close to the flow channel (40) so that the flow channel (40) forms a bayonet with a reduced flow area.

9. The liquid cooling plate according to claim 1, characterized in that: The first plate body (10), the second plate body (20) and the third plate body (30) all have an extension portion located outside the battery pack, and the first plate body (10) or the third plate body (30) has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both located on the extension portion.

10. A battery pack, characterized in that: The invention comprises a battery box and at least one battery pack, wherein the battery box comprises the liquid cooling plate according to any one of claims 1 to 9, the battery pack is arranged in the battery box, the battery pack comprises a plurality of batteries (60) stacked on each other, and the liquid cooling plate is arranged between adjacent battery packs.

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