Liquid cooling flow channel and liquid cooling plate

Abstract

The invention belongs to the technical field of liquid cooling equipment, and discloses a liquid cooling flow channel and a liquid cooling plate. According to the liquid cooling flow channel, a plurality of rib structures are arranged in the flow channel, the plurality of rib structures are used for inducing cooling liquid in the flow channel to generate vortexes, the disorder degree of the cooling liquid is intensified, the stable flowing state of the cooling liquid in the flow channel is eliminated, the heat transfer performance of the cooling liquid is improved, and the heat exchange efficiency of the liquid cooling flow channel is improved. 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.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid cooling equipment, and particularly relates to a liquid cooling flow 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 main energy storage units, have been widely used in various high-energy density devices. However, a large amount of heat is generated during the charging and discharging process of lithium-ion batteries. If the temperature is too high, it will seriously affect the safety, life, and performance of lithium-ion batteries. Therefore, the thermal management of lithium-ion batteries has become one of the key topics in the development of lithium-ion battery technology.

[0003] Currently, the thermal management technologies of lithium-ion batteries mainly include two methods: 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 uneven 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, and the coolant in the liquid cooling system indirectly contacts the lithium-ion battery, having better temperature uniformity and higher heat transfer efficiency. At the same time, due to the simple structure design, low processing difficulty, and good economy of the straight channels in the liquid cooling plate, it has become the main flow channel in the liquid cooling system.

[0004] However, with the gradual development of the hydrodynamic boundary layer of the coolant in the straight channel, the flow rate of the coolant near the channel wall slows down, and the heat transfer efficiency along the flow direction (axial direction) of the straight channel gradually decreases, resulting in a decrease in the efficiency of heat transfer from the lithium-ion battery to the coolant, that is, the so-called reduction in heat exchange efficiency, an increase in the maximum temperature of the lithium-ion battery, and a significant temperature gradient appears in the fully developed region of the lithium-ion battery. That is, a significant temperature gradient appears in the region where the flow of the coolant is stable, the velocity distribution and temperature distribution have reached equilibrium (fully developed region). 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 straight channel becomes obvious, which will not only affect the heat dissipation efficiency of the lithium-ion battery but also may lead to the risk of thermal runaway of the lithium-ion battery. For this reason, scholars at home and abroad have carried out a large number of designs and optimizations on the structure of the straight channel, but have not found a flow channel with good temperature performance, good comprehensive performance, small pressure drop loss, and easy processing. Summary of the Invention

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

[0006] To solve the above problems, the present invention is realized through the following technical solutions: A liquid cooling channel includes a channel and a plurality of rib structures arranged in the channel;

[0007] The plurality of rib structures are sequentially arranged on the side of the channel away from the heat generating component along the extension direction of the channel, and there is a gap between adjacent two rib structures;

[0008] The plurality of rib structures induce the coolant flowing through the channel to generate vortices, intensify the chaos degree of the coolant, so as to improve the heat transfer performance of the coolant.

[0009] To better realize 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 attached to the side of the channel away from the heat generating component.

[0010] To better realize the present invention, further optimization is made in the above structure. The rib structure is an arched block structure, and the first plane of the rib structure is attached to the side of the channel away from the heat generating component;

[0011] The first plane is opposite to the arc surface of the rib structure. The first plane is rectangular. The second plane and the third plane of the rib structure are oppositely arranged on two sides of the first plane, and both the second plane and the third plane are perpendicular to the first plane. The two arc edges of the arc surface are respectively connected to the second plane and the third plane, and the two straight edges of the arc surface are respectively connected to the other two sides of the first plane. The axis of the arc surface is perpendicular to the extension direction of the channel.

[0012] To better realize 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, and the radius of the second arc edge is R2, and R1 > R2.

[0013] To better realize the present invention, further optimization is made in the above structure. The arrangement directions of the first arc edges of the arc surfaces in adjacent two rib structures are opposite.

[0014] To better realize the present invention, further optimization is made in the above structure. The connection parts between the channel and the two straight edges of the arc surface are subjected to fillet processing, and the fillet radii at the connection parts between the channel and the two straight edges of the arc surface are equal.

[0015] To better implement the present invention, further optimization is made in the above structure. The length of the flow channel is 200 mm - 500 mm, and the number of rib structures is 8 - 15.

[0016] On the other hand, the present invention also provides a liquid cooling plate, which includes a plate body and a plurality of liquid cooling channels provided on the plate body.

[0017] The present invention has the following beneficial effects compared with the prior art:

[0018] The liquid cooling channel provided by the present invention is provided with a plurality of rib structures in the channel. By using the plurality of rib structures to induce the coolant in the channel to generate vortices, the degree of chaos of the coolant is increased, the stable flow state of the coolant in the channel is eliminated, and the heat transfer performance of the coolant is improved, so as to improve the heat exchange efficiency of the liquid cooling channel. Compared with the existing straight channel, 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 and average temperature of lithium-ion batteries, and avoid the risk of thermal runaway of lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a liquid cooling plate provided with the liquid cooling channel described in Embodiment 1.

[0020] Figure 2 It is a schematic structural diagram of a liquid cooling plate provided with one of the liquid cooling channels described in Embodiment 2.

[0021] Figure 3 It is a schematic structural diagram of a liquid cooling plate provided with another liquid cooling channel described in Embodiment 2.

[0022] Figure 4 It is a schematic structural diagram of a liquid cooling plate provided with the liquid cooling channel described in Embodiment 3.

[0023] Figure 5 It is a schematic structural diagram of a liquid cooling plate provided with the liquid cooling channel described in Embodiment 4.

[0024] Figure 6 It is a schematic structural diagram of the rib structure described in Embodiments 1 to 3.

[0025] Figure 7 It is a schematic structural diagram of the rib structure described in Embodiments 3 and 4.

[0026] Figure 8 It is a temperature nephogram of a lithium-ion battery with a straight channel respectively attached to the liquid cooling channels described in Embodiments 1 and 2.

[0027] Figure 9 It is a pressure drop nephogram of a straight channel and the liquid cooling channels described in Embodiments 1 and 2.

[0028] Figure 10 It is the velocity trace diagram of the coolant in the direct flow channel and the liquid cooling channels described in Embodiment 1 and Embodiment 2.

[0029] Figure 11 It is the temperature contour map of the lithium-ion battery respectively attached to the liquid cooling channels described in Embodiment 2 to Embodiment 4.

[0030] Figure 12 It is the pressure drop contour map of the liquid cooling channels described in Embodiment 2 to Embodiment 4.

[0031] Figure 13 It is the velocity trace diagram of the coolant in the liquid cooling channels described in Embodiment 3 and Embodiment 4.

[0032] Figure 14 It is the temperature contour map of the coolant at the contact surface between the liquid cooling channel described in Embodiment 3 and the lithium-ion battery.

[0033] Figure 15 It is the temperature contour map of the coolant at the contact surface between the liquid cooling channel described in Embodiment 4 and the lithium-ion battery.

[0034] Figure 16 It is the summary diagram of the simulation results of the direct flow channel and the liquid cooling channels described in Embodiment 1 to Embodiment 4.

[0035] Figure 17 It is the Pareto diagram of the contribution value of the design variables on the rib structure to the objective function.

[0036] Figure 18 It is the simulation result diagram of different numbers of rib structures in the liquid cooling channel described in Embodiment 4.

[0037] The meanings of the reference numerals in the figure are as follows:

[0038] 1. Liquid cooling plate; 2. Rib structure; 3. Flow channel. Specific implementation manner

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1:

[0041] A liquid cooling channel includes a flow channel 3 and a plurality of rib structures 2 arranged in the flow channel 3;

[0042] The plurality of rib structures 2 are sequentially arranged on the side of the flow channel 3 away from the heat generating member along the extension direction of the flow channel 3, and there is a gap between adjacent two rib structures 2; Refer to Figure 1 , Figure 1The upper end face of the middle liquid cooling plate 1 is the side that fits the heat generating component. In this embodiment, the heat generating component is a battery, specifically a battery that generates a large amount of heat during charging and discharging, such as the lithium-ion battery mentioned in the background art. The lithium-ion battery is composed of multiple battery cells arranged in sequence along one direction.

[0043] The above liquid cooling flow channel is arranged 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 a coolant is introduced into the flow channel 3. When the coolant flows through the flow channel 3, the rib structure 2 in the flow channel 3 will induce the coolant to generate vortices, increasing the degree of chaos of the coolant and preventing the coolant from becoming a stable flow state in the flow channel 3. The vortices formed by the coolant can enhance the full mixing of the coolant, thereby improving the heat transfer performance of the coolant so that it can better absorb the heat released from the lithium-ion battery.

[0044] Compared with the straight flow channel of the prior art, this 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 (Tmax) and average temperature (Tave) of the lithium-ion battery, and avoid the risk of thermal runaway of the heat generating component.

[0045] In addition, the setting of the rib structure 2 compresses the liquid passing area of the flow channel 3 (the cross-sectional area of the flow channel 3), increasing the flow velocity of the coolant in the flow channel 3. According to the heat transfer principle, increasing the flow velocity of the coolant can effectively improve the convective heat transfer coefficient of the coolant, further improving the heat exchange effect of the flow channel 3.

[0046] Specifically, the above rib structure 2 is a rectangular block structure. Refer to Figure 1 and Figure 6 , Figure 6 The rib structure 2 corresponding to Case 1 in Figure 10 is the rib structure 2 described in this embodiment. One side of the rib structure 2 is attached to the side of the flow channel 3 away from the heat generating component, and 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 from the lithium-ion battery to the flow channel 3, 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. Refer to the corresponding illustration of Case 1 in Figure 10 The Case 1 in

[0047] Embodiment 2:

[0048] As another implementation manner of the present invention, the shape of the rib structure 2 in Embodiment 1 is an arched block structure. Refer to Figure 2 and Figure 6 , Figure 6Case 2 in [document] corresponds to rib structure 2, which is one of the rib structures 2 described in this embodiment. The arched block structure has four faces, namely three flat faces and one arc face; among them,

[0049] The above three flat faces are the first flat face, the second flat face and the third flat face respectively. The first flat face is opposite to the arc face and is rectangular. The second flat face and the third flat face are oppositely arranged on both sides of the first flat face. The two arc edges of the arc face are respectively connected to the second flat face and the third flat face, and the two straight edges of the arc face are respectively connected to the other two sides of the first flat face. The first flat face is attached to the side of the flow channel 3 away from the heating element. The axis of the arc face is perpendicular to the extension direction of the flow channel 3, and the coolant can flow between the arc face and the flow channel 3;

[0050] During the flow of the coolant, the coolant can absorb the heat transferred from the lithium-ion battery to the flow channel 3, and when the coolant flows through the gap between two adjacent rib structures 2, vortices will be generated between the two adjacent rib structures 2. See Figure 10 the corresponding illustration of Case 2 in [document], Figure 10 Case 2 in [document] is the velocity trace diagram of the coolant in the liquid cooling flow channel described in this embodiment. The generated vortices can increase the degree of chaos of the coolant, thereby improving the heat transfer performance of the coolant.

[0051] Optimally, a fillet is made at the connection between the flow channel 3 and the two straight edges of the arc face. The fillet radii (R3) at the two straight edges of the flow channel 3 and the arc face are equal. See Figure 3 and Figure 6 , Figure 6 Case 3 in [document] corresponds to another rib structure 2 in this embodiment. Making a fillet at the connection between the flow channel 3 and the two straight edges of the arc face 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, reducing the friction between the coolant and the rib structure 2, so as to further reduce the maximum temperature and average temperature of the lithium-ion battery.

[0052] Embodiment 3:

[0053] On the basis of Embodiment 2, further optimization is made. The two arc edges of the above arc face are the first arc edge and the second arc edge respectively. 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 Case 4 in [document] corresponds to the rib structure 2 described in this embodiment.

[0054] Embodiment 4:

[0055] On the basis of Embodiment 3, further optimization is made. The first arc edges of the arc faces in two adjacent rib structures 2 are arranged in the opposite direction. See Figure 5, a plurality of rib structures 2 are arranged in sequence along the length direction of the flow channel 3, with the small ends of the rib structures 2 (the planes connected to the second arc sides) facing in opposite directions, that is, arranging the plurality of rib structures 2 in a staggered manner.

[0056] Preferably, the length of the above-mentioned flow channel 3 is 200 mm - 500 mm, and the number of rib structures 2 is 8 - 15.

[0057] Comparative example:

[0058] The liquid cooling plate 1 provided with the liquid cooling channels described in Embodiment 1 and Embodiment 2 is respectively attached to the side walls of four groups of lithium-ion batteries for comparative simulation with the liquid cooling plate provided with a straight flow channel in the prior art. See Figure 8 , the temperature of the lithium-ion battery attached to the liquid cooling plate with a straight flow channel is the highest, and the highest temperature appears in several battery cells corresponding to the outlet of the straight flow channel, which is also an inevitable problem of the straight flow channel liquid cooling plate 1;

[0059] From Figure 8 the simulation diagrams corresponding to Case 0, Case 1, Case 2, and Case 3 in it, it can be obtained that adding rib structures 2 inside the straight flow channel can effectively improve the temperature performance of lithium-ion batteries, reduce the highest temperature and average temperature of lithium-ion batteries;

[0060] At the same time, the sharp edges of the rectangular block-shaped rib structures 2 will cause a large frictional force when the coolant contacts the sharp edges and the surfaces of the rib structures 2, thereby increasing the flow resistance;

[0061] In Case 2 and Case 3, after replacing the rectangular block structure with an arched block structure, the edges of the rib structures 2 are relatively smooth, and the contact between the coolant and the surfaces of the rib structures 2 is smoother, so as to further reduce the highest temperature and average temperature of the lithium-ion battery.

[0062] Compared with Case 0, the temperature performance effect of Case 2 drops the most significantly, with the highest temperature dropping by 1.089 K and the average temperature dropping by 0.92 K.

[0063] See Figure 9 , Figure 9 is the pressure drop contour map of the straight flow channel and the hydraulic flow channel 3 described in Embodiment 1 and Embodiment 2. From the content shown in the figure, it can be obtained that adding rib structures 2 inside the flow channel 3 will cause the flow resistance pressure drop (ΔPa) to rise; among them, the pressure drop refers to the pressure reduction caused by energy loss when the fluid flows in the pipe.

[0064] See Figure 10 , Figure 10 shows the velocity trace lines of the coolant inside the liquid cooling channels described in Embodiment 1 and Embodiment 2 and the straight flow channel in the prior art when the velocity of the coolant at the inlet of the flow channel 3 is 0.2 m / s;

[0065] Compared with Case 0, since the rib structure 2 arranged in the flow channel 3 (Case 1, Case 2, and Case 3) compresses the liquid passage area of the flow channel 3, the flow rate of the coolant increases;

[0066] According to the principles of heat transfer, an increase in the coolant flow rate can effectively improve the convective heat transfer coefficient of the coolant. Therefore, setting the rib structure 2 inside the flow channel 3 can further improve the heat transfer effect of the flow channel 3.

[0067] It should be noted that the rib structures 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.

[0068] To better illustrate the effects brought about by the shape changes of the rib structure 2 in Case 1, Case 2, and Case 3, the data of multiple simulation results of Case 0, Case 1, Case 2, and Case 3 are statistically formed into Table 1.

[0069] Table 1 Simulation result data of four basic flow channels 。

[0070] From the data in Table 1, it can be seen that the temperature (highest temperature and average temperature) of Case 0 is the highest, but the pressure drop is the lowest;

[0071] 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, the rib structure 2 intensifies the mixing degree of the coolant and improves the heat transfer characteristics; however, due to the obstruction of the rib structure 2 to the coolant, the pressure drop increases, and it is difficult to balance the contradiction between the temperature performance (enhanced heat transfer) and the flow resistance. Therefore, in order to more comprehensively analyze the overall performance of the flow channel 3, considering heat transfer and pressure drop comprehensively, the comprehensive evaluation index PEC (Performance Evaluation Criteria) is introduced; among them,

[0072] The friction factor ƒ is a dimensionless pipe fraction factor, which is used to evaluate the influence of the coolant flow resistance on the pump power. The calculation formula is as follows: ; In the formula, is the pressure difference between the inlet and outlet, L0 is the total length of the pipe, D is the hydraulic diameter; ρ is the fluid density; u m is the average flow velocity of the fluid.

[0073] Heat transfer coefficient The calculation formula is as follows: ; In the formula, is the average heat flux on the inner wall surface of the flow channel 3, Tw is the average temperature of the inner wall surface of the flow channel 3, T f is the average temperature of the fluid in the flow channel 3.

[0074] (Nusselt number) is used to reflect the heat transfer performance of the liquid cooling plate. The calculation formula of the Nusselt number is as follows: ; In the formula, λ is the thermal conductivity of the fluid.

[0075] The PEC calculation formula is as follows: ; In the formula, and respectively represent the Nusselt number and the friction coefficient under the basic scheme.

[0076] PEC characterizes the ratio of the heat transfer performance to that of Case 0 under the same transmission power. When the ratio is greater than 1, it indicates that under the same transmission power, the optimized flow channel 3 (Case 1, Case 2, and Case 3) can transfer more heat than the straight flow channel (Case 0), which has the effect of enhancing heat transfer, and at the same time does not cause too much increase in the pump power consumption. The larger the PEC value, the better the overall performance.

[0077] Therefore, the comprehensive evaluation index PEC is introduced. It is stipulated that the PEC value of the straight flow channel is 1, and the PEC value of Case 3 is the highest at 1.668, and the overall performance is improved by 66.80%.

[0078] It can be seen that the addition of the rib structure 2 enhances the heat dissipation capacity of the flow channel 3, and at the same time increases the flow resistance of the flow channel 3.

[0079] In order to further improve the comprehensive heat dissipation performance of the flow channel 3, enhance heat transfer, and reduce the flow resistance, on the basis of the above optimal Case 3, the rib structure 2 and the arrangement method of the rib structure 2 are further optimized, that is, the rib structure 2 and the arrangement method of the rib structure 2 recorded in Embodiment 3 and Embodiment 4.

[0080] On the basis of Case 3, the radius of one end of the rib structure 2 is reduced to form a tapered rib structure 2 with a height difference. See Figure 4 and Figure 6 for Case 4, that is, the technical solution recorded in Embodiment 3 (Case 4). On the basis of Embodiment 3, the tapered rib structures 2 are arranged staggeredly to form the technical solution of Embodiment 4 (Case 5). See Figure 5 ;

[0081] From Figure 11From the simulation diagrams corresponding to Case 3, Case 4, and Case 5, it can be obtained that the conical rib structure 2 (Case 4) can significantly reduce the pressure drop in the flow channel 3 while only increasing the temperature of the lithium-ion battery by 0.093 K. The pressure drop decreases from 224.513 Pa to 146.629 Pa, a decrease of approximately 77.88 Pa. It can be seen that the rib structure 2 with a height difference at both ends has a greater impact on the pressure drop.

[0082] In the laminar flow state (low Reynolds number), the flow of the coolant is relatively stable, and the interaction between flow layers is less. The coolant mainly flows along the streamline in the flow channel 3. In this state, the main mechanism of heat transfer is molecular diffusion, and the heat transfer efficiency is low.

[0083] As Figure 13 shown, after adding the conical rib structure 2, when the coolant in the flow channel 3 passes through the conical rib structure 2, vortices will be formed before and after the conical rib structure 2;

[0084] After arranging the conical rib structures 2 in a staggered manner (Case 5), the degree of disorder of the coolant is increased, the mixing between flow layers is intensified, the formed mixed flow further destroys its shear layer, the contact area between layers increases, and the heat exchange is more sufficient.

[0085] Therefore, the heat transfer performance of the coolant is improved, the temperature of Case 5 is further reduced, the maximum temperature and the average temperature are respectively reduced by 0.20 K and 0.19 K based on Case 4, and the pressure drop only increases by 21.62 Pa. See Figure 12 .

[0086] After arranging the conical rib structures 2 in a staggered manner, the mixing degree of the coolant is increased, the mixing between flow layers is intensified, the formed mixed flow further destroys its shear layer, the contact area between layers increases, and the heat exchange is more sufficient. When the arrangement method of the conical rib structure 2 is the same (the small ends of the rib structure 2 face the same direction), there is a relatively obvious gradient temperature of the coolant. See Figure 14 ;

[0087] However, when the conical rib structures 2 are arranged in a staggered manner (the small ends of the rib structure 2 face in opposite directions), the temperature distribution of the coolant in the flow channel 3 becomes more uniform, and the temperature gradient problem existing in the straight flow channel can be weakened. See Figure 15 .

[0088] To more comprehensively analyze the influence of different rib structures 2 and arrangement methods, Figure 16 a summary diagram of the maximum temperature, average temperature, pressure drop, and comprehensive index (PEC) of Cases 0 to 5 is given;

[0089] From Figure 16 it can be seen that the maximum temperature and average temperature of Case 5 are the lowest, which are 309.76 K (the maximum temperature isFigure 16 the values corresponding to the rightmost vertical coordinates) and 307.20 K, which are 1.17 K and 1.07 K lower than those in Case 0, respectively;

[0090] Case 5 has the highest PEC value of 2.063, and the comprehensive performance is improved by 106.03% compared with Case 0.

[0091] To explore the specific effects of each design variable (V, H, R1, R2, and R3) on the optimization objectives (the highest temperature, average temperature, and pressure drop), a sensitivity analysis of the design variables was carried out. See Figure 17 ; It can be seen from Figure 17 the content shown that V, H, and R2 are negatively correlated with the highest temperature and average temperature of the lithium-ion battery, and R1 is positively correlated with the highest temperature and average temperature of the lithium-ion battery. Increasing V, H, and R2 and decreasing R1 can improve the temperature performance of the lithium-ion battery;

[0092] V, H, and R2 are positively correlated with the pressure drop in Channel 3, and R1 is negatively correlated with the pressure drop in Channel 3. Decreasing V, H, and R2 and increasing R1 can improve the power consumption loss of the liquid cooling plate 1.

[0093] It should be noted that the above-mentioned V is the coolant flow rate, and H is the distance between the highest point of the first arc edge and the first plane. See Figure 7 .

[0094] In summary, the rib structure 2 plays an important role in improving the cooling performance of the liquid cooling plate 1. Especially when the tapered rib structures 2 are arranged staggeredly, the cooling effect is more obvious.

[0095] In this regard, based on Case 5, the number of tapered rib structures 2 was changed. For the liquid cooling plate 1 with a length of 200 mm - 500 mm, the number of tapered rib structures 2 was set to 8, 9, 10, 11, 12, 13, 14, and 15 in 8 working conditions, and simulation was carried out for these 8 working conditions. The simulation result data are as Figure 18 shown.

[0096] Under the same boundary conditions, the highest temperature and average temperature 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 is between 8 and 12; compared with the model with 8 rib structures 2, the highest temperature and average temperature of 12 rib structures 2 are reduced by 0.156 K and 0.197 K respectively;

[0097] When the number of rib structures 2 changes from 12 to 14, the change in the highest temperature and average temperature of the lithium-ion battery is relatively small;

[0098] However, when the number of rib structures 2 increases to 15, the maximum temperature and average temperature of the lithium-ion battery instead increase. 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 lowering the heat exchange rate.

[0099] During the production process, the shape, size, and number of rib structures 2 can be determined based on the temperature performance and flow resistance.

[0100] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A liquid cooling flow channel, characterized in that: It includes 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 on the side of the flow channel away from the heating element along the extension direction of the flow channel (3), and there is a gap between adjacent two rib structures (2); The plurality of rib structures (2) induce the coolant flowing through the flow channel (3) to generate vortices, intensify the chaos degree of the coolant, so as to improve the heat transfer performance of the coolant.

2. The liquid cooling flow channel according to claim 1, wherein: The rib structure (2) is a rectangular block structure, and one side of the rib structure (2) is attached to the side of the flow channel (3) away from the heating element.

3. A liquid cooling flow channel according to claim 1, characterized in that: The rib structure (2) is an arched block structure, and the first plane of the rib structure (2) is attached to the side of the flow channel (3) away from the heating element; The first plane is opposite to the arc surface of the rib structure (2), the first plane is rectangular, the second plane and the third plane of the rib structure (2) are oppositely arranged on two sides of the first plane, and both the second plane and the third plane are perpendicular to the first plane. The two arc edges of the arc surface are respectively connected to the second plane and the third plane, and the two straight edges of the arc surface are respectively connected to the other two sides of the first plane. The axis of the arc surface is perpendicular to the extension direction of the flow channel.

4. The liquid cooling channel according to claim 3, characterized in that: 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.

5. A liquid cooling flow channel according to claim 4, characterized in that: The arrangement directions of the first arc edges of the arc surfaces in adjacent two rib structures (2) are opposite.

6. A liquid cooling flow channel according to any one of claims 3 to 5, characterized in that: The connection parts of the flow channel (3) and the two straight edges of the arc surface are chamfered, and the fillet radii at the two straight edges of the flow channel (3) and the arc surface are equal.

7. The liquid cooling channel according to claim 6, wherein: The length of the flow channel (3) is 200 mm - 500 mm, and the number of the rib structures (2) is 8 - 15.

8. A liquid cooling plate, characterized in that: It includes a plate body and a plurality of liquid cooling flow channels according to any one of claims 1 to 7 arranged on the plate body.

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