A liquid cooling plate

Abstract

The present invention discloses a liquid cooling plate, comprising a liquid cooling plate body, wherein a water inlet section and a water outlet section are provided on the liquid cooling plate body, a plurality of water inlet channels are provided in parallel in the water inlet section, a plurality of water outlet channels are provided in parallel in the water outlet section, and a bypass channel is connected between the water inlet channel and the water outlet channel. The water inlet channel and the water outlet channel of the present invention are respectively connected in parallel, which can reduce pressure loss, reduce flow resistance, and make temperature cooling more uniform. The present invention can divert a portion of the coolant with lower temperature in the water inlet channel into the water outlet channel, and through the bypass channel, can qualitatively increase the pressure loss value, balance the temperature of the coolant in the water inlet channel and the water outlet channel, reduce the temperature difference between the water inlet channel and the water outlet channel, and make the cooling effect and cooling temperature of the water inlet channel and the water outlet channel basically consistent. The present invention is applied to the field of battery technology.

Description

Technical Field

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

[0002] As battery capacity increases, the heat generated by the battery system during charging and discharging also increases. Therefore, when designing a liquid cooling system, the required rated flow rate of the battery system must also be increased. However, this increased flow rate also increases pressure drop, especially in series connections. Furthermore, excessively long series flow paths can lead to problems such as large temperature differences.

[0003] The patent document with application number CN201820669355.3 discloses a water-cooled heat sink for electric vehicle power batteries, including a liquid cooling plate, on which upper coolant direct current channels and lower coolant direct current channels parallel to each other are distributed, and multiple S-shaped coolant shunt channels are connected between the upper coolant direct current channels and the lower coolant direct current channels, each shunt channel corresponds to a group of battery packs, and also includes a conversion head located on the side of the liquid cooling plate, which connects the coolant direct current channel and the external water pipe.

[0004] Patent document CN201720455516.4 discloses a liquid cooling plate structure in the form of a stamped cold plate. The liquid cooling plate is primarily composed of two layers of aluminum plates joined together by bonding or welding. A stamped flow channel, as well as an inlet and outlet for the channel, is formed between the two layers of aluminum plates. The inlet and outlet of the channel are located on the same edge of the liquid cooling plate, with the opening direction parallel to the plane between the two stamped aluminum plates. When assembling a battery module, a liquid cooling plate is placed between every two battery cells, ensuring that each cell is in direct contact with the liquid cooling plate for temperature control.

[0005] The patent document with application number CN201811000882.6 discloses a liquid cooling plate for electric vehicle power batteries, including an integrally formed liquid cooling plate body, the two ends of which are open and a flow channel structure is provided inside the liquid cooling plate body, and the two ends of the liquid cooling plate body are respectively sealed and connected with a first hollow end plate and a second hollow end plate that are communicated with them, the first hollow end plate is provided with a water inlet joint, and the second hollow end plate is provided with a water outlet joint.

[0006] The solution of the above patent document discloses parallel flow channels and spoilers, but the liquid cooling effect of the liquid cooling plate / liquid cooling plate structure / electric vehicle power battery water-cooled heat sink disclosed in the above patent document is still not very good, and there may be uneven cooling effect. Summary of the Invention

[0007] The main purpose of the present invention is to provide a liquid cooling plate that can reduce pressure loss, reduce flow resistance, and make temperature cooling more uniform.

[0008] To achieve the above-mentioned objectives, the present invention proposes a liquid cooling plate, comprising a liquid cooling plate body, wherein the liquid cooling plate body is provided with a water inlet section and a water outlet section, the water inlet section is provided with a plurality of water inlet channels in parallel, the water outlet section is provided with a plurality of water outlet channels in parallel, and a bypass channel is connected between the water inlet channel and the water outlet channel. The water inlet channel and the water outlet channel can be directly connected or indirectly connected. The further improved water inlet channel and water outlet channel replace the pipeline, reducing costs and saving layout space. The water inlet channel and the water outlet channel are filled with coolant, preferably, the coolant is a 50% ethylene glycol mixed solution.

[0009] As a further improvement, the water inlet channel and the water outlet channel are respectively provided with diverter blocks. The arrangement of the diverter blocks can be divided into neat arrangement and staggered arrangement.

[0010] In a further improvement, multiple diverter blocks are provided within the water inlet and outlet channels, respectively. These diverter blocks divide the water flow into multiple parallel diverter channels. These multiple parallel diverter channels facilitate uniform flow distribution and, through multi-level diversion, break up the fluid boundary layer, improving heat exchange efficiency and achieving a better cooling effect.

[0011] As a further improvement, the number of any two adjacent levels of diversion channels is unequal. The number of diversion channels at each level can be increasing, decreasing, or any other number, as long as the number of diversion channels at two adjacent levels is unequal. If the number of diversion channels at two adjacent levels is equal, the two adjacent levels of diversion channels are merged into one level of diversion channel, which naturally does not have the function of diverting or converging.

[0012] As a further improvement, the cross section of the diverter block parallel to the bottom or top surface of the liquid cooling plate body is elliptical, triangular, L-shaped or irregular. Diverter blocks of different shapes can be provided according to different locations and different requirements.

[0013] In a further improvement, the diverter blocks at the inlet and outlet ends of the inlet channel and at the outlet channel are all diverter blocks. The diverter blocks have a diversion function. One end of the diverter block bends toward the inlet end of the inlet channel, the outlet end of the inlet channel, the inlet end of the outlet channel, or the outlet end of the outlet channel, thereby achieving diversion.

[0014] As a further improvement, when the liquid cooling plate body is in one piece, each water inlet flow channel and each water outlet flow channel are connected separately, that is, the water inlet flow channel and the water outlet flow channel are directly connected.

[0015] As a further improvement, when there are multiple liquid cooling plate bodies, each liquid cooling plate body is connected in sequence, and each liquid cooling plate body is connected in sequence through the water inlet channel and the water outlet channel. Each water inlet channel and each water outlet channel on the liquid cooling plate body at one end are connected separately, and the water inlet channel of the liquid cooling plate body at the other end is connected to the main water inlet, and the water outlet channel of the liquid cooling plate body at the other end is also connected to the main water outlet. It can meet various design application scenarios. In particular, the liquid cooling plate body can be arranged according to the cooling temperature difference at different positions, so that the water inlet channel or water outlet channel with better cooling effect is first passed into the area with higher module temperature.

[0016] In a further improvement, the water inlet and outlet sections are located on either side of the liquid cooling plate body, and the bypass channel is located between adjacent water inlet and outlet channels. The bypass channel is only located between adjacent water inlet and outlet channels, which is sufficient to meet the objectives of this embodiment. Bypass channels can also be located between other water inlet and outlet channels, but this layout is more inconvenient.

[0017] As a further improvement, the bypass flow channel is a winding curved flow channel, which can increase the flow area of the bypass flow channel and improve the cooling effect. The winding curved flow channel is in the shape of a winding line.

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

[0019] The water inlet and outlet channels of the present invention are connected in parallel, which can reduce pressure loss, reduce flow resistance, and make temperature cooling more uniform. The liquid cooling plate body of the present invention is divided into a water inlet section and a water outlet section, and a bypass channel is provided between the water inlet channel of the water inlet section and the water outlet channel of the water outlet section, which can divert a portion of the coolant with lower temperature in the water inlet channel into the water outlet channel. Through the bypass channel, the pressure loss value can be qualitatively increased, the temperature of the coolant in the water inlet and water outlet channels can be balanced, and the temperature difference between the water inlet and water outlet channels can be reduced, so that the cooling effect and cooling temperature of the water inlet and water outlet channels are basically the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 It is a structural diagram of the cold plate body;

[0022] Figure 2This is a schematic diagram of the structure of forming multi-stage diversion channels on the cold plate body;

[0023] Figure 3 This is a schematic diagram of the connection of three cold plate bodies;

[0024] Figure 4 It is a three-dimensional diagram of the cold plate body;

[0025] Figure 5 It is a schematic diagram of the arrangement and structure of the diversion block;

[0026] Figure 6 Another schematic diagram of the diversion block arrangement and structure. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two or more, such as three, unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] like Figures 1 to 6 As shown, the direction indicated by the arrow in the figure is the direction of coolant flow. A liquid cooling plate comprises at least one liquid cooling plate body 1, a water inlet section 2 and a water outlet section 3 are provided on the liquid cooling plate body 1, a plurality of water inlet channels 4 are provided in parallel in the water inlet section 2, a plurality of water outlet channels 5 are provided in parallel in the water outlet section 3, and a bypass channel 6 is connected between the water inlet channel 4 and the water outlet channel 5. The water inlet channel 4 and the water outlet channel 5 can be connected directly or indirectly. The water inlet channel 4 and the water outlet channel 5 in this embodiment replace the pipeline, which reduces the cost and saves the layout space. The water inlet channel 4 and the water outlet channel 5 are filled with coolant, and preferably, the coolant is a 50% ethylene glycol mixed solution.

[0033] A1 and A2 represent the inlet of inlet channel 4, while C1 and C2 represent the outlet of inlet channel 4. A3 and A4 represent the inlet of outlet channel 5, while C3 and C4 represent the outlet of outlet channel 5. The design objective is to ensure that the pressure drop P24 from A2 to C4 is greater than the pressure drop P11 from A1 to C1 and the pressure drop P22 from A2 to C2. Only by meeting this pressure drop relationship can the majority of the fluid flow out of C1 and C2; a small portion of the fluid flows out of C4 through bypass channel 6, thereby achieving a uniform temperature distribution among the tributaries. Simultaneously, by qualitatively increasing the pressure drop value of bypass channel 6, the flow channel distribution is optimized. Finally, combining advanced CFD simulation technology with the actual required flow rate, quantitative flow distribution and temperature uniformity analysis are performed.

[0034] Please refer to Figure 5 and Figure 6 In this embodiment, a diverter block 7 is provided in each of the water inlet channel 4 and the water outlet channel 5. The arrangement of the diverter blocks 7 can be divided into a neat arrangement A and a staggered arrangement B.

[0035] In this embodiment, a plurality of diversion blocks 7 are respectively provided in the water inlet channel 4 and the water outlet channel 5. The water inlet channel 4 and the water outlet channel 5 are diverted by the diversion blocks 7 and form multi-stage parallel diversion channels 8. Figure 2 The main water inlet 91 is connected to two water inlet channels 4. Each water inlet channel 4 has five levels of branch channels 8. The number of the first-level branch channels 8 is two, and their codes are 1.1 and 1.2 respectively. The number of the second-level branch channels 8 is three, and their codes are 2.1, 2.2, and 2.3 respectively. The number of the third-level branch channels 8 is two, and their codes are 3.1 and 3.2 respectively. The number of the fourth-level branch channels 8 is three, and their codes are 4.1, 4.2, and 4.3 respectively. The number of the fifth-level branch channels 8 is one, and their code is 5.1. Figures 1 to 4 It can be seen that the structures of the water inlet channel 4 and the water outlet channel 5 are identical. Therefore, the water outlet channel 5 should also have five levels of diverter channels 8. Of course, this embodiment only uses five levels of diverter channels 8 as an example. In actual implementation, the water inlet channel 4 and the water outlet channel 5 can be configured with different numbers of diverter channels 8 as needed. This allows the different diverter channels 8 to continuously converge and separate during the cooling process. The multi-level parallel diverter channels 8 are more conducive to uniform flow distribution. At the same time, the multi-level diversion breaks the fluid boundary layer, improves heat exchange efficiency, and achieves better cooling effect.

[0036] In this embodiment, the number of diverter channels 8 in any two adjacent levels is unequal. Diverter channels 8 between different levels of diverter channels 8 can be used to divide and converge, thereby reducing temperature differences and improving cooling effects. The number of diverter channels 8 at each level can be increasing, decreasing, or another number, as long as the number of diverter channels 8 in two adjacent levels is unequal. If the number of diverter channels 8 in two adjacent levels is equal, the two adjacent levels of diverter channels 8 are merged into a single level of diverter channel 8, which naturally does not have the function of dividing and converging.

[0037] In this embodiment, the cross-section of the diverter block 7 parallel to the bottom or top surface of the liquid cooling plate body 1 is elliptical, triangular, L-shaped or irregular. Diverter blocks 7 of different shapes can be set according to different positions and different needs. For example, the diverter block 7 in the water inlet channel 4 and the water outlet channel 5 can be set to an elliptical shape, and the water inlet channel 4 and the water outlet channel 5 can be divided into multiple parallel diverter channels 8 through the elliptical diverter block 7; such as at the corner of the water inlet channel 4 and the water outlet channel 5, the diverter block 7 can be set to an L shape for diversion, so that the coolant in the water inlet channel 4 and the water outlet channel 5 can fully flow through the corner. If no diversion is performed, the amount of coolant flowing through the corner of the water inlet channel 4 and the water outlet channel 5 will be very small, and the cooling effect is not good. Different diversions can be performed according to the different shapes of the diverter blocks 7, such as Figure 5 and Figure 6 The triangular diversion D and the water drop diversion C in the figure.

[0038] In this embodiment, the diverter blocks 7 at the inlet and outlet ends of the water inlet channel 4 and at the inlet and outlet ends of the water outlet channel 5 are all diverter blocks 71. The diverter blocks 71 have a diversion function. One end of the diverter block 71 bends toward the inlet end of the water inlet channel 4, the outlet end of the water inlet channel 4, the inlet end of the water outlet channel 5, or the outlet end of the water outlet channel 5, thereby achieving diversion.

[0039] In this embodiment, when the liquid cooling plate body 1 is a single piece, each water inlet channel 4 is connected to each water outlet channel 5 , that is, the water inlet channel 4 is directly connected to the water outlet channel 5 .

[0040] In this embodiment, when there are multiple liquid cooling plate bodies 1, each liquid cooling plate body 1 is connected in sequence, and each liquid cooling plate body 1 is connected in sequence through the water inlet channel and the water outlet channel. Each water inlet channel and each water outlet channel on the liquid cooling plate body 1 at one end are connected separately, and the water inlet channel of the liquid cooling plate body 1 at the other end is connected to the total water inlet 91, and the water outlet channel of the liquid cooling plate body 1 at the other end is also connected to the total water outlet 92. Various design application scenarios can be met. In particular, the liquid cooling plate body 1 can be arranged according to the cooling temperature difference at different positions, so that the water inlet channel 4 or the water outlet channel 5 with better cooling effect are first passed into the area with higher module temperature.

[0041] In this embodiment, the water inlet section 2 and the water outlet section 3 are respectively arranged on both sides of the liquid cooling plate body 1, and the bypass channel 6 is arranged between the water inlet channel 4 and the water outlet channel 5 which are close to each other. Figure 1 , the bypass flow channel 6 is provided between only the water inlet flow channel 4 and the water outlet flow channel 5 that are close to each other, which is sufficient to meet the purpose of this embodiment. The bypass flow channel 6 can also be provided between other water inlet flow channels 4 and the water outlet flow channels 5, but the layout is relatively inconvenient.

[0042] In this embodiment, the bypass channel 6 is a winding curved channel, which can increase the flow area of the bypass channel 6 and improve the cooling effect. The winding curved channel is in the shape of a winding line.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: The liquid cooling plate comprises at least one liquid cooling plate body, wherein the liquid cooling plate body is provided with a water inlet section and a water outlet section, wherein the water inlet section is provided with a plurality of water inlet channels in parallel, and the water outlet section is provided with a plurality of water outlet channels in parallel, wherein a bypass channel is connected between the water inlet channel and the water outlet channel, wherein a plurality of diverter blocks are provided in the water inlet channel and the water outlet channel respectively, and the water inlet channel and the water outlet channel are diverted under the action of the diverter blocks to form a plurality of parallel diverter channels, wherein the number of diverter channels in any two adjacent levels is not equal, and wherein the cross-section of the diverter block parallel to the bottom surface or the top surface of the liquid cooling plate body is elliptical, triangular, L-shaped, or irregularly shaped; The bypass flow channel is provided between the water inlet flow channel and the water outlet flow channel which are close to each other. The bypass flow channel is a winding curved flow channel. The structures of the water inlet flow channel and the water outlet flow channel are arranged correspondingly. Each water inlet channel is provided with a corresponding first water inlet (A1) and a second water inlet (A2) in parallel at one end, and a corresponding first water outlet (C1) and a second water outlet (C2) in parallel at the other end; the first water inlet (A1) is connected in series with the first water outlet (C1), and the second water inlet (A2) is connected in series with the second water outlet (C2); Each water outlet channel is provided with a corresponding third water inlet (A3) and a fourth water inlet (A4) in parallel at one end, and a corresponding third water outlet (C3) and a fourth water outlet (C4) in parallel at the other end; the third water inlet (A3) and the third water outlet (C3) are connected in series, and the fourth water inlet (A4) and the fourth water outlet (C4) are connected in series; The water inlet channel connected to the second water inlet (A2) is also connected to the water outlet channel connected to the fourth water outlet (C4) through a bypass channel, and the pressure loss P24 from the second water inlet (A2) to the fourth water outlet (C4) is greater than the pressure loss P11 from the first water inlet (A1) to the first water outlet (C1) and the pressure loss P22 from the second water inlet (A2) to the second water outlet (C2); The water inlet area and the water outlet area are respectively arranged on two sides of the liquid cooling plate body.

2. The liquid cooling plate according to claim 1, wherein: The diversion blocks at the water inlet end and the water outlet end of the water inlet flow channel and the water inlet end and the water outlet end of the water outlet flow channel are all diversion diversion blocks.

3. The liquid cooling plate according to claim 1, wherein: When the liquid cooling plate body is in one piece, each water inlet channel and each water outlet channel are connected to each other.

4. The liquid cooling plate according to claim 1, wherein: When there are multiple liquid cooling plate bodies, the liquid cooling plate bodies are connected in sequence, and the liquid cooling plate bodies are connected in sequence through the water inlet channel and the water outlet channel. The water inlet channels and the water outlet channels on the liquid cooling plate body at one end are connected respectively, the water inlet channel of the liquid cooling plate body at the other end is connected to the main water inlet, and the water outlet channel of the liquid cooling plate body at the other end is also connected to the main water outlet.

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