Flow channel liquid cooling plate, battery box body and manufacturing method

Abstract

The invention relates to the technical field of battery heat dissipation, and provides a flow channel liquid cooling plate, a battery box and a manufacturing method, the flow channel liquid cooling plate comprises an upper cover plate, a flow channel plate and a water nozzle, the upper cover plate and the flow channel plate are matched groove-shaped plates, and each of the upper cover plate and the flow channel plate comprises a groove bottom plate and a groove wall plate extending upwards along the periphery of the groove bottom plate; continuous flow channel grooves are formed in a groove bottom plate and at least part of groove wall plates of the flow channel plate, the upper cover plate is connected to the flow channel plate through brazing, the upper surface of the groove bottom plate of the upper cover plate is used for placing a battery cell module, the flow channel grooves cover notches of the flow channel grooves through the upper cover plate to form flow channels allowing cooling liquid to flow, and the two water nozzles are connected to the upper cover plate. And the two water nozzles are respectively communicated with the flow channel groove. The structural design of the battery box is simplified, and the overall cost of the battery pack is further reduced. Through the structural arrangement, the heat dissipation efficiency of the liquid cooling plate is improved, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery heat dissipation, in particular to a flow channel liquid cooling plate, a battery box body and a manufacturing method. BACKGROUND

[0002] With the continuous improvement of the energy density and power density of new energy automobile power batteries, the heat generated in the charging and discharging process of the power batteries increases significantly. Liquid cooling heat dissipation has become a key solution to ensure the safe and stable operation of power batteries because of its high heat carrying capacity. The structure design and manufacturing process of the liquid cooling plate, as the core component of the liquid cooling heat dissipation system, directly affect the heat dissipation effect. At present, the mainstream power battery liquid cooling plate in the industry adopts a flat plate structure, and the flow channel is only arranged in the plane. Heat exchange is achieved by the circulation of the cooling liquid in the plane flow channel. In addition, some liquid cooling plates for special structure requirements adopt 3D flow channel design, that is, the flow channel has a three-dimensional structure. However, such 3D flow channel liquid cooling plates are all processed and formed by a blowing process, which is the main manufacturing method for 3D flow channel liquid cooling plates in the industry.

[0003] However, on the one hand, the flat plate type liquid cooling plate has a flow channel limited to planar layout. The coverage range and flow path of the cooling liquid in the flow channel are limited, and it is difficult to adapt to the three-dimensional heat dissipation requirements of the power battery module. The heat dissipation efficiency has gradually failed to meet the heat dissipation requirements of high-power density batteries. On the other hand, although the 3D flow channel liquid cooling plate using the blowing process can break through the limitations of the planar flow channel, the blowing process not only has high equipment investment and production energy consumption, resulting in high manufacturing cost, but also has a narrow range of material selection due to the limitation of process characteristics, further increasing the application cost. SUMMARY

[0004] The technical problem to be solved by the present application is how to improve the heat dissipation efficiency of the liquid cooling plate while reducing the cost.

[0005] The present application provides a flow channel liquid cooling plate, which comprises an upper cover plate, a flow channel plate and a water nozzle. The upper cover plate and the flow channel plate are both groove type plates, each comprising a groove bottom plate and a groove wall plate extending upward around the groove bottom plate. The groove bottom plate and at least part of the groove wall plate of the flow channel plate are provided with a continuous flow channel groove. The upper cover plate is connected to the flow channel plate by brazing. The upper surface of the groove bottom plate of the upper cover plate is used to place a battery cell module. The flow channel groove is covered by the upper cover plate to form a flow channel for the cooling liquid to flow through the groove opening of the flow channel groove. Two water nozzles are connected to the upper cover plate, and the two water nozzles are respectively in communication with the flow channel groove.

[0006] Optionally, the area of the flow channel plate outside the flow channel groove is provided with a brazing filler layer, and the flow channel plate is brazed and connected with the upper cover plate through the brazing filler layer.

[0007] Optionally, two sides of the flow channel groove of the arc-shaped structure at the transition between the groove bottom plate and the groove wall plate of the flow channel plate are fixedly connected with the upper cover plate by laser welding.

[0008] Optionally, the groove of the upper cover plate and the groove of the flow channel plate are both provided with a rim extending horizontally outward, the rim at one end of the flow channel plate is provided with a liquid inlet groove and a liquid outlet groove respectively communicating with the flow channel groove, the rim of the upper cover plate is provided with a through hole at a position corresponding to the liquid inlet groove and the liquid outlet groove respectively, and two water nozzles are respectively connected to the two through holes and respectively communicate with the liquid inlet groove and the liquid outlet groove.

[0009] Optionally, the groove width of the liquid inlet groove and the liquid outlet groove is greater than the groove width of the flow channel groove, and the groove bottom of the liquid inlet groove and the liquid outlet groove is respectively provided with a first convex.

[0010] Optionally, the flow channel groove includes a main flow channel groove and a branch flow channel groove, the groove width of the main flow channel groove is greater than the groove width of the branch flow channel groove, and the groove bottom of the main flow channel groove is provided with a plurality of second convexes spaced apart along the flow direction.

[0011] The present application provides a flow channel liquid cooling plate, which can be applied to a power battery box of a new energy vehicle, for example. The upper cover plate and the flow channel plate are designed as groove-shaped plates that are adapted to each other. After being connected in a pasting manner, the two plates can form a bearing structure similar to a disc-shaped or basin-shaped battery cell module, which is more stable and firm in structure. At the same time, the flow channel plate can be provided with a continuous flow channel groove on the groove bottom plate and at least part of the groove wall plate, forming a three-dimensional flow channel layout. Compared with the planar flow channel of a traditional flat plate type liquid cooling plate, the cooling liquid covering range and flow path are greatly expanded, thereby more fully adapting to the three-dimensional heat dissipation requirements of the power battery module. Furthermore, the upper cover plate covers the flow channel groove to form a closed flow channel. In combination with two water nozzles respectively communicating with the flow channel groove, the circulation and flow of the cooling liquid are realized, so that the heat exchange is more efficient, thereby significantly improving the heat dissipation efficiency. At the same time, the groove-shaped upper cover plate and flow channel plate can be directly connected by brazing, without relying on the high-cost inflation process, and the material selection is more flexible, thereby effectively reducing the manufacturing cost. In addition, the upper surface of the groove bottom plate of the upper cover plate is directly used for placing the battery cell module, so that the liquid cooling plate can directly hold the battery cell module and bear part of the weight, thereby simplifying the battery box structure design and further reducing the overall cost of the battery pack. Through the above structural arrangement, not only the heat dissipation efficiency of the liquid cooling plate is improved, but also the cost is saved.

[0012] In addition, the present application also provides a battery box comprising the flow channel liquid cooling plate as described above.

[0013] Compared with the related art, the battery box provided by the present application has the technical effects of the flow channel liquid cooling plate as described above, which are substantially the same, and will not be described here.

[0014] Further, the application also provides a manufacturing method of the flow channel liquid cooling plate, for manufacturing the flow channel liquid cooling plate as described above, and the manufacturing method comprises the following steps: providing a plate material, respectively stamping and processing the plate material to form an upper cover plate and a flow channel plate with a matched groove structure, and stamping and forming a continuous flow channel groove on the groove bottom plate and at least part of the groove wall plate of the flow channel plate; after corresponding lamination of the upper cover plate and the flow channel plate, fixedly connecting the two by brazing treatment to form a closed flow channel for cooling liquid flow; connecting two water nozzles to the upper cover plate respectively, so that the two water nozzles are both communicated with the closed flow channel, and the flow channel liquid cooling plate is obtained.

[0015] Optionally, after corresponding lamination of the upper cover plate and the flow channel plate, fixedly connecting the two by brazing treatment to form a closed flow channel for cooling liquid flow, comprising: coating a brazing filler metal layer on the upper surface of the flow channel plate in the area outside the flow channel groove, and after lamination of the upper cover plate and the flow channel plate, placing them in a brazing furnace, filling the lamination gap by melting the brazing filler metal layer and sealingly connecting the upper cover plate and the flow channel plate.

[0016] Optionally, after corresponding lamination of the upper cover plate and the flow channel plate, fixedly connecting the two by brazing treatment to form a closed flow channel for cooling liquid flow, further comprising: using laser welding to fixedly and sealingly connect the corresponding positions of the upper cover plate and the two side parts of the arc-shaped structure of the flow channel groove at the transition of the groove bottom plate and the groove wall plate of the flow channel plate.

[0017] Compared with the related art, the manufacturing method of the flow channel liquid cooling plate provided by the application has the following technical effects: The manufacturing method of the flow channel liquid cooling plate provided by the application can conveniently form the upper cover plate and the flow channel plate with a groove structure and simultaneously stamp a continuous flow channel groove on the groove bottom plate and at least part of the groove wall plate of the flow channel plate by adopting a stamping process, compared with a blowing process, the stamping process has low equipment investment, small production energy consumption, simple operation and high mass production efficiency, thereby reducing the manufacturing cost; and the upper cover plate and the flow channel plate are bonded and then subjected to brazing treatment, so that the two form a closed flow channel with good sealing performance, ensuring stable circulation of the cooling liquid and thereby ensuring the heat dissipation efficiency; and the water nozzle is connected with the upper cover plate and communicates with the closed flow channel, so that the overall assembly of the liquid cooling plate is completed, the whole manufacturing process is simple and efficient, and complex tooling fixtures are not needed, further reducing the production difficulty and cost; meanwhile, the stamping process can be adapted to various aluminum alloy plates such as 3 series, 5 series and 6 series, breaking the limitation of the blowing process on the material, thereby improving the product adaptability while reducing the material cost, and realizing effective control of the cost on the basis of improving the heat dissipation efficiency of the liquid cooling plate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an exploded structural schematic diagram of the flow channel liquid cooling plate of the embodiment of the application. Figure 2 It is a structural schematic diagram of the flow channel liquid cooling plate in use. Figure 3 It is a bottom view structural schematic diagram of the flow channel liquid cooling plate. Figure 4 It is a partial structural schematic diagram of the flow channel liquid cooling plate. Figure 5 It is a partial cross-sectional structural schematic diagram of the flow channel liquid cooling plate. Figure 6 It is a structural schematic diagram of a traditional battery box. Figure 7 It is a flow schematic diagram of the manufacturing method of the flow channel liquid cooling plate of the embodiment of the application.

[0019] BRIEF DESCRIPTION OF DRAWINGS 10-upper cover plate, 11-through hole, 20-flow channel plate, 30-water nozzle, 40-flow channel groove, 41-main flow channel groove, 42-branch flow channel groove, 43-second convex block, 51-liquid inlet groove, 52-liquid outlet groove, 53-first convex block, 01-battery cell module, 02-traditional battery cell, 03-frame, 04-traditional liquid cooling plate, 05-bottom plate. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings.

[0021] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above-described drawings are intended to distinguish similar objects and are not necessarily used to describe a particular sequence or order, unless otherwise specified or limited by the context. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0022] In the description of the present application, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inner" and "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application. And a coordinate system Z is provided herein, the positive direction of the Z axis represents the upper direction, and the negative direction of the Z axis represents the lower direction.

[0023] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the description of the present application, the description of the terms "embodiment", "one embodiment" and "one implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0025] As Figures 1 to 5As shown, the embodiment of the present application provides a flow channel liquid cooling plate, which comprises an upper cover plate 10, a flow channel plate 20 and a water nozzle 30. The upper cover plate 10 and the flow channel plate 20 are both compatible groove plates, each comprising a groove bottom plate and a groove wall plate extending upward along the four sides of the groove bottom plate. The groove bottom plate and at least part of the groove wall plate of the flow channel plate 20 are provided with a continuous flow channel groove 40. The upper cover plate 10 is connected to the flow channel plate 20 by brazing. The upper surface of the groove bottom plate of the upper cover plate 10 is used to place the battery cell module 01. The flow channel groove 40 is covered by the upper cover plate 10 to form a flow channel for the cooling liquid to flow through the groove opening of the flow channel groove 40. Two water nozzles 30 are connected to the upper cover plate 10, and the two water nozzles 30 are respectively communicated with the flow channel groove 40 to form the circulation flow of the cooling liquid.

[0026] It should be noted that, as Figure 6 As shown, the composition of the traditional battery box is that the traditional battery cell 02 is located on the flat traditional liquid cooling plate 04. The traditional liquid cooling plate 04 is a whole flat plate. The heat-conducting glue is coated on the traditional liquid cooling plate 04, and then the traditional battery cell 02 of the power battery is placed thereon to form a layered structure from top to bottom, i.e. the battery cell, the heat-conducting glue and the liquid cooling plate. The bottom plate 05 below the traditional liquid cooling plate 04 is used to prevent the bottom ball from hitting. Generally, the frame 03 of the battery box bears the weight of the battery cell, so the weight of the battery box is generally high, the design is relatively complex, and the cost of the structural material is relatively high.

[0027] Specifically, the groove structure depth of the upper cover plate 10 and the flow channel plate 20 according to the size and bearing requirement of the battery cell module 01 is designed. After the two are connected, the structure is similar to a disc or a basin type to hold the battery cell module 01 to bear the weight, the structure bearing capacity is higher, and the traditional part of the frame structure and other bearing structures can be omitted, thereby saving the cost of the structural material. The depth of the flow channel groove 40 ensures the smooth flow of the cooling liquid and the structural strength of the flow channel plate 20. The flow channel groove 40 continuously extends on the groove bottom plate and the groove wall plate of the flow channel plate 20 to form a three-dimensional 3D flow channel. The 3D flow channel is a flow channel with a three-dimensional structure. The traditional liquid cooling plate is generally a flat plate, i.e. the flow channel is located in the same plane. In the embodiment, the flow channel is located in the flat plate of the groove bottom plate of the flow channel plate 20 and also in the groove wall plate of the flow channel plate 20, i.e. on the side wall. The whole flow channel groove 40 is not located in the same plane to form a 3D flow channel, so that the cooling liquid can be close to the battery cell module 01 from multiple dimensions to improve the comprehensiveness of heat exchange and be more conducive to the smooth flow of the cooling liquid, thereby further improving the heat dissipation efficiency. The two water nozzles 30 are respectively used as the liquid inlet end and the liquid outlet end and are respectively communicated with the flow channel groove 40 to form the circulation flow of the cooling liquid. The fitting surface precision of the upper cover plate 10 and the flow channel plate 20 is controlled within a preset range to ensure that the sealing performance after brazing meets the standard and to avoid the leakage of the cooling liquid.

[0028] In the present embodiment, the flow channel liquid cooling plate provided by the present embodiment can be applied to a power battery box of a new energy vehicle, for example. By designing the upper cover plate 10 and the flow channel plate 20 as groove-shaped plates that are adapted to each other, a load-bearing structure similar to a disc-shaped or basin-shaped battery cell module 01 can be formed after the two are connected in a bonded manner, and the structure is more firm and stable. At the same time, the flow channel plate 20 can be provided with continuous flow channel grooves 40 on the groove bottom plate and at least part of the groove wall plate, forming a flow channel layout with a three-dimensional structure. Compared with the planar flow channel of a conventional flat plate liquid cooling plate, the coverage range and flow path of the cooling liquid are greatly expanded, thereby more fully adapting to the three-dimensional heat dissipation requirements of the power battery module. Furthermore, by covering the flow channel grooves 40 with the upper cover plate 10 to form a closed flow channel, and by cooperating with the two water nozzles 30 to respectively communicate with the flow channel grooves 40 to realize the circulation and flow of the cooling liquid, heat exchange is more efficient, thereby significantly improving the heat dissipation efficiency. At the same time, the groove-shaped upper cover plate 10 and the flow channel plate 20 can be directly connected by brazing, without relying on a high-cost inflation process, and the material selection is more flexible, thereby effectively reducing the manufacturing cost. In addition, the upper surface of the groove bottom plate of the upper cover plate 10 is directly used for placing the battery cell module 01, so that the liquid cooling plate can directly hold the battery cell module 01 and bear part of the weight, thereby simplifying the structure design of the battery box and further reducing the overall cost of the battery pack. Through the above structural arrangement, not only is the heat dissipation efficiency of the liquid cooling plate improved, but also the cost is saved.

[0029] Optionally, as shown in Figure 1 and Figure 2 , the area of the flow channel plate 20 located outside the flow channel grooves 40 is provided with a brazing filler layer, and the flow channel plate 20 is brazed and connected with the upper cover plate 10 through the brazing filler layer.

[0030] Specifically, the upper cover plate 10 and the flow channel plate 20 are made of aluminum alloy sheet by stamping, and the brazing filler layer is made of brazing filler with a lower melting point than the aluminum alloy sheet. The coating thickness is preset according to the bonding gap to ensure that the brazing filler can fully fill the gap during brazing. The coating range is accurately away from the flow channel grooves 40 to avoid the brazing filler entering the flow channel and affecting the circulation of the cooling liquid, while ensuring that the bonding surface of the upper cover plate 10 and the flow channel plate 20 is fully covered with brazing filler to ensure the connection strength and sealing performance.

[0031] In the present embodiment, by fully providing the brazing filler layer on the area of the flow channel plate 20 located outside the flow channel grooves 40, the brazing filler can uniformly melt and fill all the bonding gaps when the upper cover plate 10 and the flow channel plate 20 are bonded and brazed, thereby forming a connection structure with high strength and high sealing performance, avoiding the risk of liquid leakage caused by local non-coverage of the brazing filler; the accurate brazing filler coating range not only guarantees the welding effect, but also prevents the brazing filler from polluting the flow channel, ensures smooth circulation of the cooling liquid, and thereby guarantees stable exertion of the heat dissipation efficiency, while simplifying the operation process of the brazing process and improving the consistency of mass production.

[0032] Optionally, as shown in Figure 1 ,Figure 4 and Figure 5 As shown, the two sides of the arc-shaped flow channel 40 located at the transition between the bottom plate and the wall plate of the flow channel plate 20 are fixedly connected to the top cover plate 10 by laser welding.

[0033] Specifically, due to the characteristics of the stamping process, the arc-shaped structure at the transition between the bottom plate and the wall plate of the flow channel plate 20 is prone to exceeding the brazing requirements in terms of fitting gap. Multiple laser penetration welds are set here, and the welds are evenly distributed along the arc-shaped structure. The weld length is preset according to the arc length. The heat input of laser welding is precisely controlled to avoid excessive thermal deformation affecting the dimensional accuracy of the liquid cooling plate.

[0034] In this embodiment, laser welding is used on both sides of the arc-shaped flow channel 40 to compensate for the sealing defects of brazing at large gaps, thus providing double protection for the key sealing parts of the flow channel 40 and completely eliminating the risk of coolant leakage. The high-strength connection characteristics of laser welding enhance the structural tolerance of the liquid cooling plate under vibration and impact environments, extending its service life. Precise laser welding process control avoids welding deformation, ensuring the dimensional stability of the liquid cooling plate, thereby ensuring the fit with the battery cell module 01 and maintaining heat dissipation efficiency.

[0035] Optionally, such as Figures 1 to 5 As shown, the slots of the upper cover plate 10 and the channel plate 20 both extend horizontally outward with edges. One edge of the channel plate 20 is provided with an inlet channel 51 and an outlet channel 52 that are respectively connected to the channel groove 40. The edge of the upper cover plate 10 is provided with through holes 11 at positions corresponding to the inlet channel 51 and the outlet channel 52. The two water nozzles 30 are respectively connected to the two through holes 11 and are respectively connected to the inlet channel 51 and the outlet channel 52.

[0036] Specifically, the width and thickness of the edges are designed according to assembly requirements to ensure accurate positioning when the upper cover plate 10 and the flow channel plate 20 are fitted together, while providing sufficient welding surface for brazing. The positions of the inlet groove 51 and the outlet groove 52 are both located on the edge of the same side wall, smoothly transitioning with the beginning and end of the flow channel groove 40 to reduce coolant flow resistance. The diameter of the through hole 11 is adapted to the connection end of the water nozzle 30, and is fixed by interference fit or brazing. At the same time, the water nozzle 30 has a cylindrical structure, and a circular boss structure can be provided on the outer circumference of its lower end for positioning and connection with the through hole 11, as well as for easy welding and ensuring connection sealing.

[0037] In the embodiment, the outwardly extending edge is arranged to make the upper cover plate 10 and the flow channel plate 20 more accurately positioned, improve the assembly efficiency and the brazing consistency, and thus ensure the product quality stability, and can also serve as a basic structure for connecting other structures of the battery box; the arrangement of the inlet groove 51 and the outlet groove 52 realizes the smooth transition of the cooling liquid and the flow channel groove 40, reduces the flow resistance, improves the cooling liquid circulation efficiency, and thus enhances the heat dissipation effect; the water nozzle 30 is in communication with the inlet groove 51 and the outlet groove 52 through the through hole 11, and the connection structure is simple and reliable, facilitating assembly and maintenance, while ensuring the sealing of the cooling liquid flow path to avoid leakage, and the inlet groove 51 and the outlet groove 52 can serve as the buffer area of the inlet and outlet of the flow channel groove 40 and can also serve as the starting area for the flow distribution of the flow channel, which is more convenient for the rationalization design of the overall flow channel.

[0038] Optionally, as shown in Figure 1 , Figure 3 and Figure 4 , the groove width of the inlet groove 51 and the outlet groove 52 is greater than the groove width of the flow channel groove 40, and the groove bottom of the inlet groove 51 and the outlet groove 52 is respectively provided with a first convex 53.

[0039] Specifically, the groove width of the inlet groove 51 and the outlet groove 52 is designed to be greater than the groove width of the flow channel groove 40, which ensures that the cooling liquid can be quickly distributed to the flow channel groove 40 or discharged, and reduces the pressure loss caused by the sudden change of flow rate. The first convex 53 is integrally formed by stamping, and the height is adapted to the depth of the flow channel groove 40, which plays a role in disturbing the flow and enhances the structural strength of the inlet groove 51 and the outlet groove 52.

[0040] In the embodiment, by designing the groove width of the inlet groove 51 and the outlet groove 52 to be greater than the groove width of the flow channel groove 40, the flow area of the cooling liquid is increased when entering and exiting, the flow resistance and pressure drop are reduced, the cooling liquid circulation efficiency is improved, the stability of the heat dissipation effect is ensured, and the reasonable distribution of the flow channel groove 40 is facilitated; the arrangement of the first convex 53 breaks the laminar flow state of the cooling liquid in the inlet groove 51 and the outlet groove 52, forms a turbulent flow, makes the temperature distribution of the cooling liquid more uniform, and thus improves the heat exchange efficiency of the cooling liquid in the flow channel groove 40, while enhancing the structural strength of the inlet groove 51 and the outlet groove 52, improving the overall bearing capacity of the liquid cooling plate, and the first convex 53 can also prevent the groove width of the inlet groove 51 and the outlet groove 52 from being too large, prevent the pressure drop in the inlet groove 51 and the outlet groove 52 from gathering too much cooling liquid to form a bulge, and damage the overall structural stability.

[0041] Optionally, as shown in Figure 1 , Figure 3 and Figure 4As shown, the flow channel groove 40 includes a main flow channel groove 41 and a branch flow channel groove 42, the groove width of the main flow channel groove 41 is greater than the groove width of the branch flow channel groove 42, and the groove bottom of the main flow channel groove 41 is provided with a plurality of second convexes 43 spaced apart along the flow direction.

[0042] Specifically, the main flow channel groove 41 serves as the main delivery channel of the cooling liquid, and the groove width is designed according to the total heat dissipation requirement of the liquid cooling plate and the flow rate of the cooling liquid to ensure that the cooling liquid can be quickly delivered to each area of the flow channel plate 20; the branch flow channel groove 42 can be arranged in an S-shaped distribution on the groove bottom plate of the flow channel plate 20, the main flow channel groove 41 can be arranged on the opposite two side portions of the flow channel plate 20 and respectively communicated with the liquid inlet groove 51 and the liquid outlet groove 52 to realize uniform distribution of the cooling liquid and cover the groove bottom plate and part of the groove wall plate of the flow channel plate 20, and part of the flow channel groove 40 located on the groove wall plate can be designed as the branch flow channel groove 42. The second convexes 43 are integrally formed with the flow channel plate 20 by stamping process and uniformly and spacedly distributed along the center line of the main flow channel groove 41, which is similar to the uniform arrangement of "stones" in the "river channel", which neither excessively blocks the flow of the cooling liquid nor forms moderate buffering to the high-speed water flow.

[0043] In the embodiment, through the hierarchical flow channel design of "main flow channel groove 41 + branch flow channel groove 42" and the fact that the groove width of the main flow channel groove 41 is greater than that of the branch flow channel groove 42, the cooling liquid is first delivered through the main flow channel groove 41 to realize fast and stable long-distance delivery, and then distributed to each heating part of the battery cell module 01 through the branch flow channel groove 42, thereby improving the uniformity of heat dissipation and avoiding local overheating; by arranging the second convexes 43 spacedly distributed on the groove bottom of the main flow channel groove 41, the convexes can form moderate blocking to the high-speed flowing cooling liquid, break the condition of turbulent flow, effectively inhibit the turbulent flow phenomenon in the main flow channel groove 41, thereby reducing the flow resistance and pressure drop and reducing the pump body energy consumption of the cooling system, while avoiding the flow channel vibration and noise caused by turbulent flow; in addition, the second convexes 43 are integrally formed with the flow channel plate 20, which can significantly enhance the structural strength of the main flow channel groove 41, avoid deformation of the flow channel plate 20 due to long-term bearing of the cooling liquid impact, prolong the service life of the liquid cooling plate, and ultimately ensure the heat dissipation efficiency while taking into account the flow channel stability and energy consumption control.

[0044] In addition, another embodiment of the present application provides a battery box body comprising the flow channel liquid cooling plate as described above.

[0045] Exemplarily, the battery box body is the box structure of the power battery of a new energy vehicle.

[0046] In the embodiment, the battery box body provided by the embodiment has substantially the same technical effects as the technical effects of the flow channel liquid cooling plate described above, and details are not repeated here.

[0047] In addition, as Figure 7As shown, another embodiment of the present application provides a manufacturing method of a flow channel liquid cooling plate, for manufacturing the flow channel liquid cooling plate as described above, the manufacturing method comprising the following steps: Step S1, providing a plate material, stamping the plate material to form an upper cover plate 10 and a flow channel plate 20 with a matched groove structure respectively, and stamping a continuous flow channel groove 40 on the groove bottom plate and at least part of the groove wall plate of the flow channel plate 20; Specifically, a 3-series, 5-series or 6-series aluminum alloy plate material is selected, and the thickness of the plate material is designed according to the structural strength and heat dissipation requirements of the liquid cooling plate. The stamping process adopts a continuous die or a composite die to form the groove plate and the flow channel groove 40 in one step, and the stamping precision of the flow channel groove 40 is controlled to ensure that the fitting gap of the upper cover plate 10 and the flow channel plate 20 meets the brazing requirements. The plate material after stamping is deburred to avoid the influence of sharp edges on assembly and sealing.

[0048] In this embodiment, by selecting an appropriate aluminum alloy plate material and combining a precise stamping process, the groove plate and the flow channel groove 40 are integrally formed. Compared with the inflation process, the production process is more concise, the mass production efficiency is higher, and the manufacturing cost is reduced. The flexible selection of 3-series, 5-series and 6-series aluminum alloys can adapt to different heat dissipation requirements and cost budgets to improve product versatility. The deburring treatment after stamping ensures the flatness of the fitting surface, providing a guarantee for the sealing performance and connection strength of subsequent brazing, and further ensuring the heat dissipation efficiency and service life of the liquid cooling plate.

[0049] Step S2, after the upper cover plate 10 and the flow channel plate 20 are correspondingly fitted, the two are fixedly connected by brazing treatment to form a closed flow channel for the circulation of cooling liquid; Specifically, during fitting, the positioning tool ensures that the edges of the upper cover plate 10 and the flow channel plate 20 are aligned and the position of the flow channel groove 40 is accurately corresponded. The heating temperature of the brazing furnace is set to 580-620°C, and the holding time is preset according to the thickness of the plate material and the characteristics of the brazing material to ensure that the brazing material is fully melted and fills the gap. After cooling, a sealed joint is formed.

[0050] In this embodiment, the positioning tool ensures the fitting accuracy of the upper cover plate 10 and the flow channel plate 20, so that the size and sealing performance of the closed flow channel meet the design requirements, thereby ensuring smooth circulation of the cooling liquid and heat dissipation effect. Precise control of brazing temperature and holding time ensures that the brazing material is fully melted and fills the fitting gap through capillary action to form a high-strength and high-sealing connection, avoiding the risk of liquid leakage. The brazing process is mature and reliable, with high consistency in mass production. Compared with the laser welding process, the equipment investment and production energy consumption are lower, thereby effectively controlling the manufacturing cost.

[0051] Step S3, the arc-shaped structure transition of the groove bottom plate and the groove wall plate of the flow channel plate 20 is fixed and sealed by laser welding at the corresponding position of the upper cover plate 10. Specifically, the laser welding uses a fiber laser, the welding power is adjusted according to the thickness of the plate, the welding speed is controlled within a predetermined range, and the welding seam is ensured to penetrate without excessive ablation. The position of the welding seam is accurately positioned by a visual positioning system, and is accurately aligned with the two sides of the arc-shaped structure of the flow channel groove 40.

[0052] In this embodiment, the accuracy of laser welding is ensured by the visual positioning system, so that the welding seam can accurately cover the key sealing position of the arc-shaped structure, make up for the deficiency of brazing at large gap, and completely eliminate the leakage of cooling liquid; the precisely controlled laser welding parameters ensure the welding strength and sealing performance while reducing the deformation caused by heat input, ensuring the dimensional stability of the liquid cooling plate, and further ensuring the fitting effect with the battery module 01; the composite connection mode of laser welding and brazing takes into account the connection efficiency and sealing reliability, improves the product qualification rate and service life, and at the same time avoids the problems of high cost and large deformation caused by full laser welding.

[0053] Step S4, connect two water nozzles 30 to the upper cover plate 10, so that the two water nozzles 30 are in communication with the closed flow channel, and the flow channel liquid cooling plate is obtained.

[0054] Specifically, the water nozzle 30 is made of aluminum alloy material, and the through hole 11 of the upper cover plate 10 can be fixed by brazing, and the brazing temperature is consistent with that in step S2, to ensure the connection strength and sealing performance. The mating surface of the water nozzle 30 and the through hole 11 is cleaned before assembly to remove oil stains and oxide layers, and the brazing effect is improved. At the same time, the water nozzle 30 can also be connected with the through hole 11 in interference fit, or through threaded sealing connection, etc., which are not limited here.

[0055] In this embodiment, the water nozzle 30 is assembled at a temperature consistent with the main brazing, ensuring the uniformity of the welding process and improving the production efficiency and product consistency; the cleaned mating surface ensures the connection strength and sealing performance of the brazing, avoids leakage at the connection of the water nozzle 30, and ensures the stability of the cooling liquid circulation; the precise assembly and sealing connection of the water nozzle 30 enable the liquid cooling plate to be conveniently connected with the external cooling system, improving the assembly adaptability of the product and further ensuring the operating efficiency of the overall heat dissipation system.

[0056] Optionally, as shown in Figure 7 After the upper cover plate 10 and the flow channel plate 20 are correspondingly attached, the two are fixedly connected by brazing to form a closed flow channel for the circulation of cooling liquid, which comprises: The area on the upper surface of the flow channel plate 20 outside the flow channel groove 40 is coated with a solder layer, and the upper cover plate 10 and the flow channel plate 20 are placed in a soldering furnace after being bonded, and the bonding gap is filled and the upper cover plate 10 and the flow channel plate 20 are sealed and connected by the molten solder layer.

[0057] Specifically, the solder is a powder-shaped aluminum-silicon solder, which is coated by a screen printing or spraying process to ensure uniform coverage of all bonding areas except the flow channel groove 40. Inert gas protection is used in the soldering furnace to prevent oxidation of the plate and solder and improve the welding quality.

[0058] In this embodiment, the precise solder coating process ensures that the solder layer uniformly covers the bonding area, avoiding welding defects caused by partial missed coating, thereby ensuring the sealed connection of the upper cover plate 10 and the flow channel plate 20 and preventing coolant leakage. The soldering environment under inert gas protection avoids the influence of oxidation reaction on the performance of the welded joint, improves the connection strength and corrosion resistance, and prolongs the service life of the liquid cooling plate. The molten solder layer fills the bonding gap through capillary action to achieve integrated sealed connection, ensuring the integrity of the closed flow channel, thereby ensuring smooth circulation of the coolant and improving the heat dissipation efficiency.

[0059] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A flow channel liquid cooling plate, characterized in that, The device includes an upper cover plate (10), a flow channel plate (20), and water nozzles (30). The upper cover plate (10) and the flow channel plate (20) are both adapted groove-shaped plates, each including a bottom plate and a wall plate extending upward around the bottom plate. The bottom plate and at least part of the wall plate of the flow channel plate (20) are provided with continuous flow channel grooves (40). The upper cover plate (10) is connected to the flow channel plate (20) by brazing. The upper surface of the bottom plate of the upper cover plate (10) is used to place the battery cell module (01). The flow channel groove (40) is covered by the upper cover plate (10) at the opening of the flow channel groove (40) to form a flow channel for coolant to flow. Two water nozzles (30) are connected to the upper cover plate (10) and are respectively connected to the flow channel groove (40).

2. The flow channel liquid cooling plate according to claim 1, characterized in that, The flow channel plate (20) is provided with a brazing filler layer in the area outside the flow channel groove (40), and the flow channel plate (20) is brazed to the upper cover plate (10) through the brazing filler layer.

3. The flow channel liquid cooling plate according to claim 1, characterized in that, The two sides of the arc-shaped flow channel (40) located at the transition between the bottom plate and the wall plate of the flow channel plate (20) are fixedly connected to the top cover plate (10) by laser welding.

4. The flow channel liquid cooling plate according to claim 1, characterized in that, The slots of the upper cover plate (10) and the channel plate (20) are both horizontally extended outward with edges. The edge of one end of the channel plate (20) is provided with an inlet groove (51) and an outlet groove (52) that are respectively connected to the channel groove (40). The edge of the upper cover plate (10) is provided with through holes (11) at the positions corresponding to the inlet groove (51) and the outlet groove (52). The two water nozzles (30) are respectively connected to the two through holes (11) and are respectively connected to the inlet groove (51) and the outlet groove (52).

5. The flow channel liquid cooling plate according to claim 4, characterized in that, The width of the inlet tank (51) and the outlet tank (52) is greater than the width of the flow channel (40), and the bottom of the inlet tank (51) and the outlet tank (52) are respectively provided with a first convex bulge (53).

6. The flow channel liquid cooling plate according to claim 1, characterized in that, The flow channel (40) includes a main flow channel (41) and a branch flow channel (42). The width of the main flow channel (41) is greater than the width of the branch flow channel (42), and the bottom of the main flow channel (41) is provided with a plurality of second convex bulges (43) at intervals along the flow direction.

7. A battery housing, characterized in that, Includes the flow channel liquid cooling plate as described in any one of claims 1-6.

8. A method for manufacturing a flow channel liquid cooling plate, used to manufacture the flow channel liquid cooling plate according to any one of claims 1-6, characterized in that, The manufacturing method of the flow channel liquid cooling plate includes the following steps: A sheet is provided, and the sheet is stamped to form an upper cover plate (10) and a flow channel plate (20) with a matching groove structure, and a continuous flow channel groove (40) is stamped on the bottom plate and at least part of the wall plate of the flow channel plate (20). After the upper cover plate (10) and the flow channel plate (20) are attached to each other, they are fixedly connected by brazing to form a closed flow channel for coolant to flow. Two water nozzles (30) are connected to the upper cover plate (10) respectively, so that both water nozzles (30) are connected to the closed flow channel to obtain the flow channel liquid cooling plate.

9. The method for manufacturing the flow channel liquid cooling plate according to claim 8, characterized in that, The step of attaching the upper cover plate (10) and the flow channel plate (20) together and then fixing them together by brazing to form a closed flow channel for coolant circulation includes: A brazing filler metal layer is formed on the upper surface of the flow channel plate (20) in the area outside the flow channel groove (40). During brazing, the upper cover plate (10) is attached to the flow channel plate (20) and then placed in the brazing furnace. The brazing filler metal layer melts and fills the gap between the two surfaces, sealing the upper cover plate (10) and the flow channel plate (20) together.

10. The method for manufacturing the flow channel liquid cooling plate according to claim 8, characterized in that, After the upper cover plate (10) and the flow channel plate (20) are correspondingly attached and then fixedly connected by brazing to form a closed flow channel for coolant flow, the method further includes: The arc-shaped flow channel (40) at the transition between the bottom plate and the wall plate of the flow channel plate (20) is fixed and sealed to the corresponding position of the upper cover plate (10) by laser welding.

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