Liquid cooling channel and liquid cooling plate

Abstract

The present invention belongs to the technical field of liquid cooling equipment and discloses a liquid cooling channel and a liquid cooling plate. The liquid cooling channel comprises multiple rib structures disposed within the channel. The rib structures are used to induce vortices in the coolant within the channel, exacerbating the turbulence of the coolant and eliminating the stable flow state of the coolant within the channel. This improves the heat transfer performance of the coolant and the heat exchange efficiency of the liquid cooling channel. Compared with existing straight channels, the liquid cooling channel can improve the heat dissipation efficiency of lithium-ion batteries, effectively improve the temperature performance of lithium-ion batteries, reduce the maximum and average temperatures of lithium-ion batteries, and avoid the risk of thermal runaway in lithium-ion batteries.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid cooling equipment, and in particular relates to a liquid cooling channel and a liquid cooling plate. Background Art

[0002] With the rapid development of new energy vehicles and portable electronic devices, lithium-ion batteries, as the primary energy storage unit, have been widely used in various high-energy-density devices. However, lithium-ion batteries generate a large amount of heat during the charging and discharging process. Excessive heat can seriously affect the safety, lifespan, and performance of lithium-ion batteries. Therefore, thermal management of lithium-ion batteries has become a key issue in the development of lithium-ion battery technology.

[0003] At present, the thermal management technologies of lithium-ion batteries mainly include air cooling and liquid cooling. Among them, the air cooling method uses the convection of air in the air cooling system to dissipate heat. Although it has a simple structure and low cost, its heat dissipation efficiency is limited by the heat capacity and thermal conductivity of air, resulting in difficulty in uniform temperature distribution of lithium-ion batteries and prone to local overheating problems. In contrast, in the liquid cooling method, since the thermal conductivity of the coolant in the liquid cooling system is much higher than that of air, it can provide higher heat dissipation efficiency. In addition, the coolant in the liquid cooling system is in indirect contact with the lithium-ion battery, which has better temperature uniformity and higher heat exchange efficiency. At the same time, due to the simple structural design, low processing difficulty and good economy of the direct current channel in the liquid cooling plate, it has become the main flow channel in the liquid cooling system.

[0004] However, as the coolant's dynamic boundary layer gradually develops within the DC channel, the coolant's flow velocity near the channel wall slows down, and the heat transfer efficiency along the DC channel's flow direction (axial direction) gradually decreases, resulting in a decrease in the efficiency of heat transfer from the lithium-ion battery to the coolant. This is the so-called reduced heat exchange efficiency. The maximum temperature of the lithium-ion battery increases, and a significant temperature gradient appears in the fully developed area of the lithium-ion battery. In other words, a significant temperature gradient appears in the area where the coolant flow is stable and the velocity distribution and temperature distribution have reached equilibrium (the fully developed area). This stable state is not conducive to heat exchange, so the temperature difference at the inlet and outlet of the lithium-ion battery corresponding to the DC channel becomes obvious, which not only affects the heat dissipation efficiency of the lithium-ion battery, but may also lead to the risk of thermal runaway of the lithium-ion battery. To this end, domestic and foreign scholars have conducted extensive design and optimization of the DC channel structure, but have yet to find a flow channel with good temperature performance, good overall performance, low pressure drop loss, and easy processing. Summary of the Invention

[0005] On the one hand, the present invention provides a liquid-cooling flow channel to solve the technical problem in the prior art that the flow of coolant in the straight flow channel is relatively stable, but the heat transfer efficiency of the coolant in the straight flow channel gradually decreases, causing the maximum temperature of the lithium-ion battery to increase, affecting the heat dissipation efficiency of the lithium-ion battery, and may also cause the lithium-ion battery to have a risk of thermal runaway.

[0006] To solve the above problems, the present invention is implemented through the following technical solutions:

[0007] A liquid cooling channel comprises a channel and a plurality of rib structures arranged in the channel;

[0008] The plurality of rib structures are sequentially arranged along the extension direction of the flow channel on a side of the flow channel away from the heating element, and a gap exists between two adjacent rib structures;

[0009] The multiple rib structures are used to induce vortices in the coolant flowing through the flow channel, thereby increasing the turbulence of the coolant and improving the heat transfer performance of the coolant.

[0010] In order to better implement the present invention, further optimization is made in the above structure. The rib structure is a rectangular block structure, and one side of the rib structure is in contact with the side of the flow channel away from the heating element.

[0011] In order to better implement the present invention, further optimization is made in the above structure, wherein the rib structure is an arched block structure, and the first plane of the rib structure is in contact with the side of the flow channel away from the heating element;

[0012] The first plane is opposite to the arcuate surface of the rib structure, and the first plane is rectangular. The second plane of the rib structure and the third plane of the rib structure are arranged on two sides of the first plane opposite to each other, and the second plane and the third plane are both perpendicular to the first plane. The two arc edges of the arcuate surface are respectively connected to the second plane and the third plane, and the two straight edges of the arcuate surface are respectively connected to the other two sides of the first plane, and the axis of the arcuate surface is perpendicular to the extension direction of the flow channel.

[0013] In order to better implement the present invention, further optimization is made in the above structure. The two arc edges of the arc surface are respectively a first arc edge and a second arc edge. The radius of the first arc edge is R1, the radius of the second arc edge is R2, and R1>R2.

[0014] In order to better implement the present invention, further optimization is made in the above structure, and the first arc edges of the arc-shaped surfaces in two adjacent rib structures are arranged in opposite directions.

[0015] In order to better implement the present invention, the above structure is further optimized, and the connection between the flow channel and the two straight edges of the arc surface is chamfered, and the fillet radius of the flow channel and the two straight edges of the arc surface are equal.

[0016] In order to better implement the present invention, further optimization is made in the above structure, the length of the flow channel is 200mm-500mm, and the number of the rib structures is 8-15.

[0017] On the other hand, the present invention further provides a liquid cooling plate, comprising a plate body and a plurality of liquid cooling channels arranged on the plate body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The liquid-cooling flow channel provided by the present invention comprises a plurality of rib structures arranged in the flow channel. The plurality of rib structures are used to induce vortices in the coolant in the flow channel, thereby increasing the degree of chaos in the coolant and eliminating the stable flow state of the coolant in the flow channel. The heat transfer performance of the coolant is improved, thereby improving the heat exchange efficiency of the liquid-cooling flow channel. Compared with the existing straight flow channel, the liquid-cooling flow channel can improve the heat dissipation efficiency of the lithium-ion battery, effectively improve the temperature performance of the lithium-ion battery, reduce the maximum temperature and average temperature of the lithium-ion battery, and avoid the risk of thermal runaway of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a liquid cooling plate provided with the liquid cooling channel described in Example 1.

[0021] Figure 2 This is a schematic diagram of the structure of a liquid cooling plate provided with one of the liquid cooling channels described in Example 2.

[0022] Figure 3 This is a schematic diagram of the structure of a liquid cooling plate provided with another liquid cooling channel described in Example 2.

[0023] Figure 4 This is a schematic diagram of the structure of a liquid cooling plate provided with the liquid cooling channel described in Example 3.

[0024] Figure 5 It is a schematic diagram of the structure of a liquid cooling plate provided with the liquid cooling channel described in Example 4.

[0025] Figure 6 It is a schematic structural diagram of the rib structure described in Examples 1 to 3.

[0026] Figure 7 It is a schematic structural diagram of the rib structure described in Example 3 and Example 4.

[0027] Figure 8 It is a temperature cloud diagram of the lithium-ion battery in which the direct flow channel is respectively bonded with the liquid-cooling flow channel described in Example 1 and Example 2.

[0028] Figure 9 It is a pressure drop cloud diagram of the straight channel and the liquid cooling channel recorded in Example 1 and Example 2.

[0029] Figure 10 It is a velocity trace diagram of the coolant in the straight channel and the liquid cooling channel recorded in Example 1 and Example 2.

[0030] Figure 11 It is the temperature cloud diagram of the lithium-ion battery respectively bonded with the liquid cooling channel described in Example 2 to Example 4.

[0031] Figure 12 It is a pressure drop cloud diagram of the liquid cooling flow channel recorded in Examples 2 to 4.

[0032] Figure 13 It is a velocity trace diagram of the coolant in the liquid cooling channel recorded in Example 3 and Example 4.

[0033] Figure 14 This is a temperature cloud diagram of the coolant at the contact surface between the liquid cooling channel and the lithium-ion battery described in Example 3.

[0034] Figure 15 This is a temperature cloud diagram of the coolant at the contact surface between the liquid cooling channel and the lithium-ion battery described in Example 4.

[0035] Figure 16 It is a summary diagram of the simulation results of the straight channel and the liquid-cooling channel described in Examples 1 to 4.

[0036] Figure 17 It is a Pareto diagram of the contribution of the design variables on the rib structure to the objective function.

[0037] Figure 18 1 is a diagram showing simulation results of different numbers of rib structures in the liquid cooling channel described in Example 4.

[0038] The meanings of the numbers in the figure are:

[0039] 1. Liquid cooling plate; 2. Rib structure; 3. Flow channel. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1:

[0042] A liquid cooling channel comprises a channel 3 and a plurality of rib structures 2 arranged in the channel 3;

[0043] The plurality of rib structures 2 are sequentially arranged on the side of the flow channel 3 away from the heating element along the extension direction of the flow channel 3, and there is a gap between two adjacent rib structures 2; see Figure 1 , Figure 1The upper end surface of the middle liquid cooling plate 1 is the side that contacts the heating element. In this embodiment, the heating element is a battery, specifically a battery that generates a large amount of heat during the charging and discharging process, such as the lithium-ion battery mentioned in the background technology. The lithium-ion battery consists of multiple battery cells arranged in sequence along one direction.

[0044] The liquid cooling channel is provided in the liquid cooling plate 1. During use, the liquid cooling plate 1 is attached to the side wall of the lithium-ion battery, and coolant is introduced into the channel 3. When the coolant flows through the channel 3, the rib structure 2 in the channel 3 induces vortices in the coolant, increasing the degree of turbulence of the coolant and preventing the coolant from flowing steadily in the channel 3. The vortices formed by the coolant can intensify the thorough mixing of the coolant, thereby improving the heat transfer performance of the coolant and enabling it to better absorb the heat released by the lithium-ion battery.

[0045] Compared with the direct flow channel of the existing technology, this liquid cooling channel can improve the heat dissipation efficiency of lithium-ion batteries, effectively improve the temperature performance of lithium-ion batteries, reduce the maximum temperature (Tmax) and average temperature (Tave) of lithium-ion batteries, and avoid the risk of thermal runaway of heating components.

[0046] In addition, the provision of the rib structure 2 compresses the liquid flow area of the flow channel 3 (the cross-sectional area of the flow channel 3), thereby increasing the flow rate of the coolant in the flow channel 3. According to the principles of heat transfer, the increase in the flow rate of the coolant can effectively increase the convective heat transfer coefficient of the coolant, thereby further improving the heat exchange effect of the flow channel 3.

[0047] Specifically, the rib structure 2 is a rectangular block structure, see Figure 1 and Figure 6 , Figure 6 The rib structure 2 corresponding to Case 1 is the rib structure 2 described in this embodiment. One side of the rib structure 2 is in contact with the side of the flow channel 3 away from the heating element. The coolant can flow between the rib structure 2 and the flow channel 3. During the flow of the coolant, the coolant can absorb the heat transferred to the flow channel 3 by the lithium-ion battery. When the coolant flows through the gap between two adjacent rib structures 2, the coolant will generate a vortex between the two adjacent rib structures 2. Figure 10 The corresponding diagram of Case 1 in Figure 10 Case 1 is a velocity trace diagram of the coolant in the liquid cooling channel recorded in this embodiment. The vortex generated by the coolant between two adjacent rib structures 2 can increase the degree of chaos of the coolant, thereby improving the heat transfer performance of the coolant.

[0048] Example 2:

[0049] As another embodiment of the present invention, the shape of the rib structure 2 in Example 1 is an arched block structure, see Figure 2 and Figure 6 , Figure 6The rib structure 2 corresponding to Case 2 is one of the rib structures 2 described in this embodiment. The arched block structure has four faces, which are three planes and one arcuate face.

[0050] The three planes mentioned above are respectively the first plane, the second plane and the third plane. The first plane is opposite to the curved surface. The first plane is rectangular. The second plane is arranged on two sides of the first plane opposite to the third plane. The two arc edges of the curved surface are respectively connected to the second plane and the third plane. The two straight edges of the curved surface are respectively connected to the other two sides of the first plane. The first plane is in contact with the side of the flow channel 3 away from the heating element. The axis of the curved surface is perpendicular to the extension direction of the flow channel 3. The coolant can flow between the curved surface and the flow channel 3.

[0051] During the coolant flow process, the coolant can absorb the heat transferred to the flow channel 3 by the lithium-ion battery, and when the coolant flows through the gap between two adjacent rib structures 2, the coolant will generate vortices between the two adjacent rib structures 2. Figure 10 The corresponding diagram of Case 2 is, Figure 10 Case 2 is a velocity trace diagram of the coolant in the liquid cooling channel recorded in this embodiment. The generated vortex can increase the degree of chaos of the coolant, thereby improving the heat transfer performance of the coolant.

[0052] Optimized, fillet processing is performed at the connection between the flow channel 3 and the two straight edges of the arc surface. The fillet radius (R3) at the flow channel 3 and the two straight edges of the arc surface are equal. Figure 3 and Figure 6 , Figure 6 The rib structure 2 corresponding to Case 3 in the figure is another rib structure 2 in this embodiment. The chamfering treatment at the connection between the flow channel 3 and the two straight edges of the arc surface can make the edge of the rib structure 2 smoother, and the contact between the coolant and the surface of the rib structure 2 is smoother, thereby reducing the friction between the coolant and the rib structure 2, thereby further reducing the maximum temperature and average temperature of the lithium-ion battery.

[0053] Example 3:

[0054] Based on the second embodiment, further optimization is made. The two arc edges of the arc surface are respectively the first arc edge and the second arc edge. The radius of the first arc edge is R1, the radius of the second arc edge is R2, and R1>R2; see Figure 4 and Figure 6 , Figure 6 The rib structure 2 corresponding to Case 4 is the rib structure 2 described in this embodiment.

[0055] Example 4:

[0056] Based on the embodiment 3, further optimization is made, and the first arc edges of the arc surfaces of two adjacent rib structures 2 are arranged in reverse order, see Figure 5The multiple rib structures 2 are arranged in sequence along the length direction of the flow channel 3 so that the small ends of the rib structures 2 (the plane connected to the second arc edge) face oppositely, that is, the multiple rib structures 2 are staggered.

[0057] Preferably, the length of the flow channel 3 is 200 mm to 500 mm, and the number of the rib structures 2 is 8 to 15.

[0058] Comparative Example:

[0059] The liquid cooling plate 1 provided with the liquid cooling channels described in Example 1 and Example 2 and the liquid cooling plate provided with the straight channel in the prior art were respectively attached to the side walls of four groups of lithium-ion batteries for comparative simulation. Figure 8 The temperature of the lithium-ion battery attached to the liquid cooling plate 1 of the direct current channel is the highest, and the highest temperature appears at the corresponding cells at the outlet of the direct current channel. This is also an inevitable problem of the direct current channel liquid cooling plate 1;

[0060] Depend on Figure 8 From the simulation diagrams corresponding to Case 0, Case 1, Case 2, and Case 3, it can be concluded that adding rib structure 2 inside the DC channel can effectively improve the temperature performance of the lithium-ion battery and reduce the maximum and average temperatures of the lithium-ion battery.

[0061] At the same time, the sharp edges of the rectangular block-shaped rib structure 2 will cause the coolant to generate greater friction when it contacts the sharp edges and the surface of the rib structure 2, thereby increasing the flow resistance;

[0062] In Case 2 and Case 3, after the rectangular block structure was replaced with an arched block structure, the edge of the rib structure 2 was smoother, and the contact between the coolant and the surface of the rib structure 2 was smoother, thereby further reducing the maximum temperature and average temperature of the lithium-ion battery.

[0063] Compared with Case 0, the temperature performance effect of Case 2 decreased most significantly, with the maximum temperature decreasing by 1.089K and the average temperature decreasing by 0.92K.

[0064] See also Figure 9 , Figure 9 3 is a pressure drop cloud diagram of the straight channel and the hydraulic channel 3 described in Examples 1 and 2. It can be concluded from the content shown in the figure that the addition of the rib structure 2 inside the channel 3 will lead to an increase in the flow resistance pressure drop (ΔPa); wherein, the pressure drop refers to the pressure drop caused by energy loss when the fluid flows in the pipe.

[0065] See also Figure 10 , Figure 10 The figure shows the velocity traces of the coolant in the liquid cooling channels described in Examples 1 and 2 and the straight channel in the prior art when the velocity of the coolant at the inlet of the channel 3 is 0.2 m / s.

[0066] Compared with case 0, the rib structure 2 arranged in the flow channel 3 (case 1, case 2 and case 3) compresses the liquid flow area of the flow channel 3, resulting in an increase in the flow rate of the coolant;

[0067] It is known from the principles of heat transfer that increasing the coolant flow rate can effectively improve the coolant convective heat transfer coefficient. Therefore, providing the rib structure 2 inside the flow channel 3 can further improve the heat transfer effect of the flow channel 3.

[0068] It is worth noting that the rib structure 2 corresponding to Case 2 and Case 3 can effectively disturb the flow state of the coolant, change the flow direction of the coolant (not a straight flow), and further improve the convective heat transfer coefficient of the coolant.

[0069] In order to better illustrate the effects of Case 1, Case 2 and Case 3 after the shape change of the rib structure 2, the data of multiple simulation results of Case 0, Case 1, Case 2 and Case 3 are statistically analyzed to form Table 1.

[0070] Table 1 Simulation results of four basic flow channels

[0071] .

[0072] From the data in Table 1 , it can be seen that Case 0 has the highest temperature (maximum temperature and average temperature) but the lowest pressure drop;

[0073] The temperature of Case 2 is lower than that of Case 0, but the pressure drop is higher than that of Case 0. As can be seen from the above, rib structure 2 enhances the mixing of the coolant and improves the heat transfer characteristics. However, the pressure drop increases due to the obstruction of the coolant by rib structure 2, making it difficult to balance the contradiction between temperature performance (enhanced heat transfer) and flow resistance. Therefore, in order to more comprehensively analyze the overall performance of convection channel 3, the comprehensive evaluation index PEC (Performance Evaluation Criteria) is introduced by comprehensively considering heat transfer and pressure drop.

[0074] The friction factor ƒ is a dimensionless pipe fraction factor that is used to evaluate the effect of coolant flow resistance on pump power. The calculation formula is as follows:

[0075] ;

[0076] Where, is the inlet and outlet pressure difference, L0 is the total length of the pipeline, D is the hydraulic diameter; ρ is the fluid density; u m is the average flow velocity of the fluid.

[0077] Heat transfer coefficient The calculation formula is as follows:

[0078] ;

[0079] Where, is the average heat flux on the inner wall of channel 3, T w is the average temperature of the inner wall of channel 3, T f is the average temperature of the fluid in flow channel 3.

[0080] Nusselt number is used to reflect the heat transfer performance of the liquid cooling plate. The Nusselt number is calculated as follows:

[0081] ;

[0082] Where λ is the thermal conductivity of the fluid.

[0083] The PEC calculation formula is as follows:

[0084] ;

[0085] Where, and represent the Nusselt number and friction coefficient under the basic scheme respectively.

[0086] PEC represents the ratio of heat transfer performance to Case 0 at the same transmission power. When the ratio is greater than 1, it indicates that at the same transmission power, the optimized flow channel 3 (Case 1, Case 2, and Case 3) can transfer more heat than the straight channel (Case 0). This has an enhanced heat transfer effect without causing an excessive increase in pump power consumption. The larger the PEC value, the better the overall performance.

[0087] Therefore, the comprehensive evaluation index PEC is introduced, and the PEC value of the direct current is stipulated to be 1. The highest PEC value of Case 3 is 1.668, and the presidential performance is improved by 66.80%.

[0088] It can be seen that the addition of the rib structure 2 enhances the heat dissipation capability of the flow channel 3 , while also increasing the flow resistance of the flow channel 3 .

[0089] In order to further improve the comprehensive heat dissipation performance of the flow channel 3 and enhance heat transfer, and reduce flow resistance, the rib structure 2 and the arrangement of the rib structure 2 are further optimized based on the above-mentioned optimal case 3, that is, the rib structure 2 and the arrangement of the rib structure 2 recorded in Example 3 and Example 4.

[0090] Based on Case 3, the radius of one end of the rib structure 2 is reduced to form a conical rib structure 2 with a height difference, see Figure 4 and Figure 6Case 4 in Example 3 (Case 4) is the technical solution described in Example 3. On the basis of Example 3, the conical rib structure 2 is staggered to form the technical solution of Example 4 (Case 5). Figure 5 ;

[0091] Depend on Figure 11 From the simulation diagrams corresponding to Case 3, Case 4, and Case 5, it can be concluded that the tapered rib structure 2 (Case 4) significantly reduces the pressure drop in the flow channel 3 from 224.513 Pa to 146.629 Pa, a decrease of approximately 77.88 Pa, while increasing the temperature of the lithium-ion battery by only 0.093 K. This shows that the rib structure 2 with a height difference at both ends has a greater impact on the pressure drop.

[0092] In the laminar flow state (low Reynolds number), the coolant flows relatively smoothly, and there is less interaction between the flow layers. The coolant flows mainly along the streamlines in the flow channel 3. In this state, the main mechanism of heat transfer is molecular diffusion, and the heat transfer efficiency is low.

[0093] like Figure 13 As shown, after the conical rib structure 2 is added, when the coolant in the flow channel 3 passes through the conical rib structure 2, vortices are formed in front and behind the conical rib structure 2;

[0094] After the conical rib structure 2 is staggered (Case 5), the chaos of the coolant is aggravated, the mixing between the flow layers is intensified, the formed mixed flow further destroys its shear layer, the contact area between the layers is increased, and the heat exchange is more sufficient.

[0095] Therefore, the heat transfer performance of the coolant is improved, which further reduces the temperature of Case 5. The maximum temperature and average temperature decrease by 0.20K and 0.19K respectively compared with Case 4, and the pressure drop increases by only 21.62Pa. Figure 12 .

[0096] After the tapered rib structures 2 are staggered, the mixing degree of the coolant is increased, the mixing between the flow layers is intensified, and the mixed flow formed further destroys the shear layer, the contact area between the layers is increased, and the heat exchange is more sufficient. When the tapered rib structures 2 are arranged in the same way (the direction of the small end of the rib structure 2 is the same), the coolant temperature has a relatively obvious gradient temperature, see Figure 14 ;

[0097] By staggering the tapered rib structures 2 (with the small ends of the rib structures 2 facing in opposite directions), the temperature of the coolant in the flow channel 3 is more evenly distributed, which can weaken the temperature gradient problem existing in the straight flow channel. Figure 15 .

[0098] In order to more comprehensively analyze the influence of different rib structures and arrangements, Figure 16The summary graph of the results of maximum temperature, average temperature, pressure drop and comprehensive index (PEC) of Case 0 to Case 5 is given;

[0099] from Figure 16 It can be seen that the maximum temperature and average temperature of Case 5 are both the lowest, which are 309.76K (the maximum temperature is Figure 16 The values corresponding to the rightmost vertical axis in the figure are 307.20K, which are 1.17K and 1.07K lower than those in case 0, respectively.

[0100] Case 5 has the highest PEC value of 2.063, and its overall performance is improved by 106.03% compared with Case 0.

[0101] In order to explore the specific effects of each design variable (V, H, R1, R2 and R3) on the optimization objectives (maximum temperature, average temperature and pressure drop), a sensitivity analysis of the design variables was performed. Figure 17 ;Depend on Figure 17 The displayed content shows that V, H and R2 are negatively correlated with the maximum temperature and average temperature of the lithium-ion battery, while R1 is positively correlated with the maximum temperature and average temperature of the lithium-ion battery. Increasing V, H and R2 and reducing R1 can improve the temperature performance of the lithium-ion battery.

[0102] V, H, and R2 are positively correlated with the pressure drop of the flow channel 3, and R1 is negatively correlated with the pressure drop of the flow channel 3. Reducing V, H, and R2 and increasing R1 can improve the power loss of the liquid cooling plate 1.

[0103] It is worth noting that V is the coolant flow rate, and H is the distance between the highest point of the first arc edge and the first plane. Figure 7 .

[0104] In summary, the rib structure 2 plays an important role in improving the cooling performance of the liquid cooling plate 1 , and especially after the tapered rib structures 2 are staggered, the cooling effect is more obvious.

[0105] In this regard, based on Case 5, the number of tapered rib structures 2 is changed. For the liquid cooling plate 1 with a length of 200mm-500mm, the number of tapered rib structures 2 is set to 8, 9, 10, 11, 12, 13, 14, and 15 respectively. These 8 working conditions are simulated, and the simulation results are as follows: Figure 18 shown.

[0106] Under the same boundary conditions, the maximum and average temperatures of the lithium-ion battery gradually decrease with the increase in the number of rib structures 2, and the change is most obvious when the number of rib structures 2 changes from 8 to 12. Compared with the model with 8 rib structures 2, the maximum and average temperatures of the model with 12 rib structures 2 decrease by 0.156K and 0.197K, respectively.

[0107] When the number of rib structures 2 changes from 12 to 14, the changes in the maximum temperature and average temperature of the lithium-ion battery are relatively small;

[0108] However, when the number of rib structures 2 increases to 15, the maximum temperature and average temperature of the lithium-ion battery increase instead. This may be because too many rib structures 2 occupy the narrow space of the flow channel 3, reducing the contact area between the coolant and the inner wall of the flow channel 3, and reducing the heat exchange rate.

[0109] During the production process, the shape, size and number of the rib structure 2 can be determined according to temperature performance and flow resistance.

[0110] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A liquid cooling channel, characterized in that: It comprises a flow channel (3) and a plurality of rib structures (2) arranged in the flow channel (3); The plurality of rib structures (2) are sequentially arranged along the extension direction of the flow channel (3) on a side of the flow channel away from the heating element, and a gap exists between two adjacent rib structures (2); The plurality of rib structures (2) are used to induce vortices in the coolant flowing through the flow channel (3), thereby increasing the degree of turbulence of the coolant and improving the heat transfer performance of the coolant; The rib structure (2) is an arched block structure, and the rib structure (2) comprises a first plane, a second plane, a third plane, and an arcuate surface, wherein the first plane is in contact with a surface of the flow channel (3) away from the heating element; The first plane is opposite to the arcuate surface, the first plane is rectangular, the second plane is opposite to the third plane and is arranged on both sides of the first plane, and the second plane and the third plane are both perpendicular to the first plane, the two arc sides of the arcuate surface are respectively connected to the second plane and the third plane, the two straight sides of the arcuate surface are respectively connected to the other two sides of the first plane, and the axis of the arcuate surface is perpendicular to the extension direction of the flow channel; The two arc edges of the arc surface are respectively a first arc edge and a second arc edge, the radius of the first arc edge is R1, the radius of the second arc edge is R2, and R1>R2; The first arc edges of the arc-shaped surfaces in two adjacent rib structures (2) are arranged in opposite directions; The connection between the flow channel (3) and the two straight edges of the arc-shaped surface is chamfered, and the fillet radii of the flow channel (3) and the two straight edges of the arc-shaped surface are equal.

2. The liquid cooling channel according to claim 1, characterized in that: The length of the flow channel (3) is 200 mm to 500 mm, and the number of the rib structures (2) is 8 to 15.

3. A liquid cooling plate, characterized in that: The invention comprises a plate body and a plurality of liquid cooling channels according to claim 1 or 2 arranged on the plate body.

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