Liquid cooling plate, battery pack and vehicle

Abstract

The invention specifically discloses a liquid cooling plate, a battery pack and a vehicle, the liquid cooling plate comprises a cooling plate body, the cooling plate body is internally provided with a plurality of parallel main flow channels which are communicated in sequence, each main flow channel comprises a plurality of sub flow channels which are mutually independent and connected in parallel, and every two adjacent main flow channels are communicated through a circulation opening; every two adjacent sub-runners are communicated through a liquid flow port, at least part of the liquid flow ports are located at the inlet end of the main runner, and in at least part of the main runner, the flowing sectional areas of the multiple liquid flow ports located at the inlet end of the main runner are gradually reduced in the direction away from the flowing ports. The liquid cooling plate disclosed by the invention can optimize the flow field distribution of the internal flow channel and improve the heat exchange efficiency of the liquid cooling plate.

Description

Technical Field

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

[0002] The internal water channel of the liquid cooling plate is composed of multiple channels connected in series and parallel. The fluid needs to pass through a large turning radius when changing its flow direction. After the fluid changes its flow direction, due to the inertia of the fluid, the turned fluid will be more distributed to the side away from the turning point, resulting in great unevenness in the fluid flow distribution in the channel after the turn. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides a liquid cooling plate, which can optimize the flow field distribution of the liquid cooling plate and improve the heat exchange efficiency of the liquid cooling plate.

[0004] An embodiment of the present invention further provides a battery pack.

[0005] An embodiment of the present invention further provides a vehicle.

[0006] The liquid cooling plate of the embodiment of the present invention comprises:

[0007] A cold plate body, wherein the cold plate body has a plurality of parallel and sequentially connected main flow channels, the main flow channel includes a plurality of mutually independent and parallel sub-flow channels, two adjacent main flow channels are connected via a flow port, a fluid flows into the main flow channel via the flow port at the inlet end of the main flow channel, and flows out of the main flow channel via the flow port at the outlet end of the main flow channel, and two adjacent sub-flow channels are connected via a liquid flow port;

[0008] At least part of the liquid flow openings are located at the inlet end of the main channel to allow the fluid flowing into the main channel to be diverted to multiple sub-channels. In at least part of the main channel, the flow cross-sectional area of ​​the multiple liquid flow openings located at the inlet end gradually decreases in the direction away from the flow openings.

[0009] The liquid cooling plate of the embodiment of the present invention can utilize multiple sub-channels arranged in the main channel to divert the fluid in the main channel. By gradually reducing the flow cross-sectional area of ​​the multiple liquid flow ports at the inlet end of the main channel along the direction of fluid flow, the inertia of the fluid can be gradually reduced, and the flow rate of the fluid through different liquid flow ports can be controlled, thereby adjusting the flow rate in different sub-channels, thereby optimizing the flow field distribution of the liquid cooling plate, reducing the unevenness of the flow distribution in different sub-channels, and improving the heat exchange efficiency of the liquid cooling plate.

[0010] In some embodiments, the flow cross-sectional area of ​​the liquid flow port closest to the flow port at the inlet end is Sa , S a =(0.8~0.9)S1, wherein S1 is the flow cross-sectional area of ​​the flow port.

[0011] In some embodiments, at the inlet end of the main flow channel, the difference in flow cross-sectional areas between two adjacent liquid flow ports is (0.1-0.2)*(S1 / n), wherein n is the number of the sub-flow channels in one main flow channel.

[0012] In some embodiments, the cold plate body has a cavity, and the cavity is provided with:

[0013] A plurality of first baffles, wherein the plurality of first baffles are arranged in the cavity at intervals along the width direction of the cold plate body to form a plurality of parallel main flow channels in the cavity;

[0014] A plurality of second baffles are arranged in the main flow channel at intervals along the width direction of the cold plate body to form a plurality of parallel sub-flow channels in the main flow channel.

[0015] In some embodiments, the cavity has a first end face and a second end face in the length direction of the cold plate body, the first partition plate is spaced apart from the first end face or the second end face to form the flow port, and the second partition plate is spaced apart from the first end face and the second end face to form a liquid flow port.

[0016] In some embodiments, the cold plate body comprises:

[0017] a first component, the first component having a cavity, the first baffle and the second baffle being arranged in the cavity, the cavity having a first opening and a second opening being arranged opposite to each other along a length direction of the cold plate body;

[0018] The second component includes two second components, and the two second components are respectively arranged at two ends of the first component to block the first opening and the second opening to form the cavity.

[0019] In some embodiments, the second component has a boss, and the boss is inserted into the corresponding first opening or second opening to form the first end surface or the second end surface of the cavity. There are multiple first components, and the multiple first components are arranged side by side along the width direction of the cold plate body, and two adjacent first components are attached to each other.

[0020] In some embodiments, the flow cross-sectional areas of the plurality of sub-flow channels located in the same main flow channel are the same; and / or

[0021] The cross section of the sub-flow channel is circular or polygonal.

[0022] The battery pack according to the embodiment of the present invention comprises:

[0023] A liquid cooling plate as described in any of the above embodiments;

[0024] A battery cell is arranged on the liquid cooling plate.

[0025] The vehicle according to the embodiment of the present invention comprises a battery pack as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of flow channel distribution in a liquid cooling plate according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the main flow channel inlet end of an embodiment of the present invention.

[0028] Figure 3 Schematic diagram of the structure of a liquid cooling plate according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the connection structure of the first component and the second component of an embodiment of the present invention.

[0030] Figure 5 It is a schematic structural diagram of a first partition and a second partition according to an embodiment of the present invention.

[0031] Figure 6 FIG. 4 is a fluid flow distribution diagram of a sub-channel according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] Cold plate body 1, first component 11, second component 12, boss 121;

[0034] Main channel 2, sub-channel 21, flow port 22, liquid flow port 23;

[0035] A first partition 31 and a second partition 32;

[0036] A first end surface 41 and a second end surface 42;

[0037] Liquid inlet pipe 51 and liquid outlet pipe 52. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] See also Figure 1The liquid cooling plate of the embodiment of the present invention comprises a cold plate body 1, wherein the cold plate body 1 has a plurality of parallel and sequentially connected main channels 2, and both ends of the main channels 2 have flow openings 22 for allowing the fluid to enter and flow out of the main channels 2. The fluid entering the cold plate body 1 passes through each main channel 2 in sequence and then flows out of the cold plate body 1 from the outlet, so as to perform heat exchange cooling on the battery cells on the cold plate body 1.

[0040] like Figure 1 As shown, the main channel 2 includes a plurality of independent and parallel sub-channels 21, and a liquid flow port 23 is provided between two adjacent sub-channels 21, at least part of the liquid flow port 23 is located at the inlet end of the main channel 2, and the fluid entering the main channel 2 is distributed to each sub-channel 21 through the liquid flow port 23, and the fluid in each sub-channel 21 is collected to the flow port 22 at the outlet end of the main channel 2 through the liquid flow port 23 after reaching the outlet end of the main channel 2, and flows to the next main channel 2 or flows out of the cold plate body 1. The arrangement of the plurality of sub-channels 21 can further divert and homogenize the fluid in the main channel 2.

[0041] The fluid entering the main channel 2 through the flow port 22 at the inlet end of the main channel will cause more fluid to be distributed to the side away from the flow port 22 due to the effect of fluid inertia. Therefore, the fluid flow distribution in the multiple sub-channels 21 in the main channel 2 is too uneven due to the influence of fluid inertia. In the liquid cooling plate of the embodiment of the present invention, in the corresponding main channel 2, the flow cross-sectional area of ​​the multiple liquid flow ports 23 located at the inlet end of the main channel 2 is gradually reduced along the direction of fluid flow, such as Figure 2 As shown, the reduction in the flow cross-sectional area of ​​the liquid flow port 23 can reduce the fluid flow rate in the sub-channel behind the corresponding liquid flow port 23, thereby making the fluid more evenly distributed in the multiple sub-channels 21 at the inlet end of the main channel 2, reducing the unevenness of flow distribution in the multiple sub-channels 21.

[0042] The liquid cooling plate of the embodiment of the present invention can utilize multiple sub-channels 21 arranged in the main channel 2 to divert the fluid in the main channel 2, and control the flow rate of the fluid in different sub-channels 21 by regulating the flow cross-sectional areas of different liquid flow ports 23 at the inlet end of the main channel 2, thereby optimizing the flow field distribution of the liquid cooling plate, reducing the unevenness of the flow distribution in different sub-channels 21, and improving the heat exchange efficiency of the liquid cooling plate.

[0043] In some embodiments, the flow cross-sectional area of ​​the liquid flow port 23 closest to the flow port 22 at the inlet end of the main channel 2 is S a , S a =(0.8~0.9)S1, where S1 is the flow cross-sectional area of ​​the flow port 22.

[0044] That is to say, the flow cross-sectional area of ​​the flow opening 22 of the main channel 2 is larger than the cross-sectional area of ​​each liquid flow opening 23, so as to ensure that the fluid flow entering the main channel 2 is sufficient. The flow cross-sectional area S of the liquid flow opening 23 closest to the flow opening 22 at the inlet end of the main channel 2 is a Satisfy S a =(0.8~0.9)S1,S a The value can be 0.8S1, 0.82S1, 0.85S1, 0.89S1, or 0.9S1. While ensuring sufficient flow distributed to the rear of the liquid flow port 23, a certain fluid is restricted to enable the restricted fluid to enter the sub-channel 21 closest to the flow port 22 at the inlet end of the main channel 2, so that the fluid flow entering the sub-channel 21 closest to the flow port 22 at the inlet end of the main channel 2 can obtain a greater benefit.

[0045] When the flow cross-sectional area sizes of the liquid flow openings 23 at the inlet end of the main channel 2 are the same, the following information can be obtained through flow field simulation calculation: the fluid flow rate allocated to the sub-channel 21 closest to the flow opening 22 at the inlet end of the main channel 2 is the least, and the fluid flow rate allocated to the sub-channel 21 farthest from the flow opening 22 at the inlet end of the main channel 2 is the greatest. By calculating the flow cross-sectional area S of the liquid flow opening 23 closest to the flow opening 22 at the inlet end of the main channel 2 a The limitation, combined with the structural design in which the flow cross-sectional area of ​​the multiple liquid flow ports 23 located at the inlet end of the main channel 2 gradually decreases along the direction of fluid flow, can improve the unevenness of the flow in the multiple sub-channels 21 in the main channel 2.

[0046] When the flow cross-sectional area S a When it is greater than 0.9S1, the restricted fluid flow rate will be too small. At this time, by adjusting the flow cross-sectional area of ​​other liquid flow ports 23 at the inlet end of the main channel 2, it is difficult to change the fluid flow rate in the sub-channel 21 closest to the flow port 22 at the inlet end of the main channel 2, and the optimization benefit is too low. a When it is less than 0.8S1, too much flow will be restricted. Although it will increase the fluid flow in the sub-channel 21 closest to the flow port 22 at the inlet end of the main channel 2, it will cause a large change in the fluid flow in other sub-channels 21, which is not conducive to optimizing the unevenness of the fluid flow in the multiple sub-channels 21 of the main channel 2 and increases the uncertainty of the fluid flow distribution.

[0047] In some embodiments, at the inlet end of the main channel 2 , the difference in flow cross-sectional areas between two adjacent liquid flow ports 23 is (0.1-0.2)*(S1 / n), where n is the number of sub-channels 21 in one main channel 2 .

[0048] That is to say, due to the different numbers of sub-channels 21 in the main channel 2, the fluid flow unevenness in multiple sub-channels 21 will be different. Therefore, it is necessary to determine the difference in flow cross-sectional areas of two adjacent liquid flow ports 23 according to the number of sub-channels 21 in the main channel 2. The difference in flow cross-sectional areas of two adjacent liquid flow ports 23 is (0.1~0.2)*(S1 / n).

[0049] Further, the number of the sub-flow channels 21 in the main flow channel 2 may be 3-12, and specifically, the number of the sub-flow channels 21 may be 3, 4, 6, 7 or 11.

[0050] For example, when the number of sub-channels 21 in the main channel 2 is 4, the difference in flow cross-sectional area between two adjacent liquid flow ports 23 is (0.1~0.2)*(S1 / 4). Specifically, the difference in flow cross-sectional area between two adjacent liquid flow ports 23 can be 0.1*(S1 / 4), 0.13*(S1 / 4), 0.15*(S1 / 4), 0.19*(S1 / 4) or 0.2*(S1 / 4).

[0051] The flow cross-sectional area of ​​two adjacent liquid flow ports 23 is adjusted within this range to match the flow cross-sectional area S of the liquid flow port 23 closest to the flow port 22 at the inlet end of the main channel 2. a The parameter value can optimize the unevenness of the fluid flow in the plurality of sub-channels 21 in the entire main channel 2.

[0052] When the difference in flow cross-sectional area between two adjacent liquid flow ports 23 is less than 0.1*(S1 / n), the flow cross-sectional area of ​​the liquid flow port 23 will decrease too little, resulting in a large amount of fluid flow into the sub-channel 21 that is farther from the flow port 22 at the inlet end of the main channel 2, which cannot achieve the purpose of optimizing the unevenness of the fluid flow in the multiple sub-channels 21; when the difference in flow cross-sectional area between two adjacent liquid flow ports 23 is greater than 0.2*(S1 / n), the flow cross-sectional area of ​​the liquid flow port 23 will decrease too much, resulting in a large amount of fluid flow into the sub-channel 21 that is farther from the flow port 22 at the inlet end of the main channel 2, which also cannot achieve the purpose of optimizing the unevenness of the fluid flow in the multiple sub-channels 21.

[0053] like Figure 1 and Figure 2 As shown, in some embodiments, the cold plate body 1 has a cavity, and a plurality of first partitions 31 are arranged in the cavity. The plurality of first partitions 31 are arranged in the cavity at intervals along the width direction of the cold plate body 1 to form a plurality of parallel main channels 2 in the cavity. The flow port 22 is arranged on the first partition 31 near the end or at the end of the first partition so that the plurality of main channels 2 are connected end to end in sequence through the flow port 22, thereby forming a serpentine medium flow channel to cover the entire liquid cooling plate and realize heat exchange cooling of the battery cells on the liquid cooling plate.

[0054] A plurality of second baffles 32 are provided in the main channel 2, and the plurality of second baffles 32 are arranged in the main channel 2 at intervals along the width direction of the cold plate body 1 to form a plurality of parallel sub-channels 21 in the main channel 2. The liquid flow port 23 can be opened at a position close to the end of the second baffle 32 or arranged at the end of the second baffle 32, wherein the width direction of the cold plate body 1 is the left-right direction shown in the figure.

[0055] The liquid cooling plate of the embodiment of the present invention has the characteristics of good surface flatness, strong load-bearing capacity and low processing difficulty, and can be formed by extrusion, and the internal cavity extruded by the mold can be directly used as a flow channel.

[0056] Furthermore, the fluids in two adjacent main channels 2 of the embodiment of the present invention flow in opposite directions, and the fluids make a 90° turn at both ends of the main channel 2. The turned fluids enter the next main channel 2 through the flow port 22, and the fluids entering the next main channel 2 make a 90° turn to be distributed to the corresponding sub-channels 21. Therefore, the inertial effect of the fluid has a great influence on the flow distribution of the fluid, and the fluid is more easily distributed to the sub-channel 21 far away from the flow port 22. The embodiment of the present invention can effectively optimize the problem of uneven distribution of multiple sub-channels 21 in the main channel 2 by controlling the flow cross-sectional areas of different liquid flow ports 23, so that the performance of the liquid cooling plate is further improved.

[0057] like Figure 2 As shown, in some embodiments, the cavity has a first end face 41 and a second end face 42 in the length direction of the cold plate body 1, the first partition 31 is spaced from the first end face 41 or the second end face 42 to form a flow port 22, and the second partition 32 is spaced from the first end face 41 and the second end face 42 to form a liquid flow port 23, wherein the length direction of the cold plate body 1 is the front-to-back direction shown in the figure.

[0058] That is to say, a gap is formed between the first partition 31 in the embodiment of the present invention and the first end face 41 or the second end face 42 so that the gap forms a flow opening 22, and there are gaps between the two ends of the second partition 32 and the first end face 41 and the second end face 42, so that liquid flow openings 23 are formed at both ends of the second partition 32, and at the inlet end of the main channel 2 where the flow needs to be adjusted and distributed, the second partition 32 forms a stepped rib structure.

[0059] In order to connect the main channel 2 from beginning to end in sequence, when the first partition 31 forms a gap with one of the first end face 41 and the second end face 42, the first partition 31 must be abutted and sealed with the other of the first end face 41 and the second end face 42, so that the cavity of the cold plate body 1 is divided into a serpentine medium flow channel.

[0060] like Figure 3-Figure 5As shown, in some embodiments, the cold plate body 1 includes a first component 11 and a second component 12, the first component 11 has a cavity, the first partition 31 and the second partition 32 are arranged in the cavity, the cavity has a first opening and a second opening arranged opposite to each other along the length direction of the cold plate body 1, there are two second components 12, and the two second components 12 are respectively arranged at both ends of the first component 11 to block the first opening and the second opening to form a cavity.

[0061] That is to say, the first component 11 is the main body of the cold plate body 1, and the flow channels are distributed on the first component 11, so the battery cells are also arranged on the first component 11, and the second component 12 is equivalent to a head, which is used to seal the openings at both ends of the first component 11 to form a sealed cavity. The separate setting of the first component 11 and the second component 12 facilitates the processing and molding of the components. After the first component 11 is extruded, the first partition 31 and the second partition 32 can be formed. At the same time, the cavity between the first partition 31 and the second partition 32 is used as a flow channel, which improves the bearing capacity and structural stability of the structure.

[0062] The first component 11 has a top plate and a bottom plate arranged opposite to each other along the thickness direction of the cold plate body 1, and a side plate arranged along the width direction of the cold plate body 1, thereby forming a cavity with a first opening and a second opening, wherein the thickness direction of the cold plate body 1 is the up-and-down direction shown in the figure.

[0063] Furthermore, the embodiment of the present invention can optimize the unevenness of the fluid flow in the sub-channel 21 by only changing the length of the first baffle 31 and the second baffle 32, which greatly reduces the difficulty and cycle of the early design of the cold plate body 1, and also reduces the complexity of the mold during later processing. Without disturbing the flow channel design and production process of the cold plate body 1, it can optimize and improve the heat exchange effect of the liquid cooling plate to a greater extent with a relatively small change.

[0064] like Figure 4 As shown, in some embodiments, the second component 12 has a boss 121, and the boss 121 is inserted into the corresponding first opening or second opening to form the first end surface 41 or the second end surface 42 of the cavity.

[0065] In order to realize the connection and assembly of the first component 11 and the second component 12, a boss 121 is provided on the second component 12. The size of the boss 121 in the length direction of the cold plate body 1 is Figure 4 As shown in D, the boss 121 is inserted into the corresponding first opening or second opening to form the first end face 41 or the second end face 42 of the cavity. At this time, the distance between the first partition 31 and the second partition 32 and the end of the first component 11 needs to be increased by D accordingly, and an assembly space is reserved for the boss 121. The first component 11 and the second component 12 are fixed by stir friction welding.

[0066] Furthermore, the flow port 22 and the liquid flow port 23 in the embodiment of the present invention correspond to each other in the width direction of the cold plate body 1, which is more convenient for the flow of the fluid during the turning process and reduces the flow dead angle. At this time, since the thickness of the cold plate body 1 remains unchanged, the flow cross-sectional area of ​​the flow port 22 and the difference or ratio between the flow cross-sectional areas of different liquid flow ports 23 can be proportionally converted into the difference or ratio of the spacing distance between the first partition plate 31 and the corresponding end surface and the spacing distance between different second partition plates 32 and the corresponding end surface.

[0067] For example, Figure 2 As shown, the size of the flow port 22 in the length direction of the cold plate body 1 is D1. In the main channel 2 that needs to be adjusted for flow distribution, the sizes of the multiple liquid flow ports 23 located at the inlet end of the main channel 2 in the length direction of the cold plate body 1 are a, b, c, etc., respectively. Three second partitions 32 are shown in the figure, and the number n of the second partitions 32 can be selected according to actual conditions.

[0068] At this time, a, b, c, and D1 satisfy the following relationship:

[0069] D1>a>b>c

[0070] a=(0.8~0.9)D1;

[0071] ab=bc=(0.1~0.2)*(D1 / n).

[0072] At the outlet end of the main channel 2, the multiple liquid flow ports 23 have the same size in the length direction of the cold plate body 1, as shown by m in the figure.

[0073] Through simulation analysis, under the above parameter relationship, the maximum benefit of improving the flow distribution uniformity of the sub-channel 21 is more than 50%. Figure 6 The flow rate of each sub-channel is compared based on the flow field simulation of the liquid cooling plate according to the embodiment of the present invention. Figure 1 The sub-channels 21 in the middle liquid cooling plate are numbered from right to left. Figure 6 The middle horizontal axis is the corresponding number of each sub-channel 21 in the liquid cooling plate. Figure 6 The ordinate in is the fluid flow rate. At the inlet end of the main flow channel 2 where the flow rate needs to be adjusted and distributed, since the distance between the second partition plate 32 and the corresponding end surface decreases successively, the plurality of second partition plates 32 form a stepped rib structure. Figure 6 The sub-channels 21 involved in the two rectangular frames can more clearly show the flow changes after the stepped rib structure is set. Compared with the flat state, the flow rates of the 6th, 8th, 9th, 14th, 15th and 16th channels near the turning point are significantly improved, and the flow field distribution of the entire cold plate is more uniform.

[0074] In addition, since the two main channels 2 at the front and rear ends are respectively connected to the liquid inlet pipe 51 and the liquid outlet pipe 52 of the liquid cooling plate, it can be determined whether to set the flow cross-sectional area of ​​the liquid flow port 23 of the second partition plate 32 at the corresponding position to be stepped down according to the arrangement positions of the liquid inlet pipe 51 and the liquid outlet pipe 52, such as Figure 3 As shown, the liquid inlet direction of the liquid inlet pipe 51 is along the thickness direction of the cold plate body, and the liquid inlet pipe 51 is arranged at a position close to the middle of the corresponding main channel 2. There is no need to set the flow cross-sectional area of ​​the liquid flow port 23 of the second partition 32 at the corresponding position in a step-by-step manner. It is sufficient to have the same area as the liquid flow port 23 at the inlet end of the main channel 2 corresponding to the liquid inlet pipe 51. When the liquid flow port 23 is formed by the interval between the second partition 32 and the corresponding end face, it is flush with the end of the second partition 32 at the inlet end of the main channel 2 corresponding to the liquid inlet pipe 51.

[0075] In some embodiments, there are multiple first components 11, and the multiple first components 11 are arranged side by side along the width direction of the cold plate body 1, and two adjacent first components 11 are attached to each other. That is, when the size of the liquid cooling plate in the width direction is large, in order to facilitate production and processing, multiple first components 11 can be arranged side by side, and the number of first components 11 can be two, three or five.

[0076] In some embodiments, the flow cross-sectional areas of multiple sub-channels 21 located in the same main channel 2 are the same, and the cross-section of the sub-channel 21 is circular or polygonal, that is, the cross-section of the sub-channel 21 can be circular, triangular, rectangular, diamond, trapezoidal, etc.

[0077] The battery pack according to the embodiment of the present invention comprises a liquid cooling plate and a battery cell as in any of the above embodiments, wherein the battery cell is arranged on the liquid cooling plate.

[0078] In the battery pack of the embodiment of the present invention, the battery cells are arranged on the liquid cooling plate, and the bottom of the battery cells is in contact with the liquid cooling plate. The bottom of the battery cells is generally rectangular. When arranged, the longer sides of the bottom of the battery cells are parallel to the width direction of the liquid cooling plate, so that the battery cells can be arranged across more parallel sub-channels 21 as much as possible, avoiding the bottom of the battery cells corresponding to only a single or a few sub-channels 21, so as to ensure that the fluid flow rate flowing through the bottom of the battery cells is roughly the same, thereby improving the heat exchange cooling effect on the battery cells.

[0079] The vehicle according to the embodiment of the present invention includes a battery pack as described in any of the above embodiments.

[0080] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A liquid cooling plate, characterized in that: include: A cold plate body, wherein the cold plate body has a plurality of parallel and sequentially connected main flow channels, the main flow channel includes a plurality of mutually independent and parallel sub-flow channels, two adjacent main flow channels are connected via a flow port, a fluid flows into the main flow channel via the flow port at the inlet end of the main flow channel, and flows out of the main flow channel via the flow port at the outlet end of the main flow channel, and two adjacent sub-flow channels are connected via a liquid flow port; At least part of the liquid flow openings are located at the inlet end of the main channel to allow the fluid flowing into the main channel to be diverted to multiple sub-channels. In at least part of the main channel, the flow cross-sectional area of ​​the multiple liquid flow openings located at the inlet end gradually decreases in the direction away from the flow openings.

2. The liquid cooling plate according to claim 1, characterized in that: The flow cross-sectional area of ​​the liquid flow port closest to the flow port at the inlet end is S a , S a =(0.8~0.9)S1, wherein S1 is the flow cross-sectional area of ​​the flow port.

3. The liquid cooling plate according to claim 2, characterized in that: At the inlet end of the main flow channel, the difference between the flow cross-sectional areas of two adjacent liquid flow ports is (0.1-0.2)*(S1 / n), wherein n is the number of the sub-flow channels in one main flow channel.

4. The liquid cooling plate according to any one of claims 1 to 3, characterized in that: The cold plate body has a cavity, and the cavity is provided with: A plurality of first baffles, wherein the plurality of first baffles are arranged in the cavity at intervals along the width direction of the cold plate body to form a plurality of parallel main flow channels in the cavity; A plurality of second baffles are arranged in the main flow channel at intervals along the width direction of the cold plate body to form a plurality of parallel sub-flow channels in the main flow channel.

5. The liquid cooling plate according to claim 4, characterized in that: The cavity has a first end face and a second end face in the length direction of the cold plate body, the first partition plate is spaced from the first end face or the second end face to form the flow port, and the second partition plate is spaced from the first end face and the second end face to form a liquid flow port.

6. The liquid cooling plate according to claim 5, characterized in that: The cold plate body comprises: a first component, the first component having a cavity, the first baffle and the second baffle being arranged in the cavity, the cavity having a first opening and a second opening being arranged opposite to each other along a length direction of the cold plate body; The second component includes two second components, and the two second components are respectively arranged at two ends of the first component to block the first opening and the second opening to form the cavity.

7. The liquid cooling plate according to claim 6, characterized in that: The second component has a boss, and the boss is inserted into the corresponding first opening or the second opening to form the first end surface or the second end surface of the cavity.

8. The liquid cooling plate according to claim 6 or 7, characterized in that: There are multiple first components, and the multiple first components are arranged side by side along the width direction of the cold plate body, and two adjacent first components are attached to each other.

9. The liquid cooling plate according to any one of claims 1 to 3, characterized in that: The flow cross-sectional areas of the plurality of sub-flow channels located in the same main flow channel are the same; and / or The cross section of the sub-flow channel is circular or polygonal.

10. A battery pack, characterized in that: include: The liquid cooling plate according to any one of claims 1 to 9; A battery cell is arranged on the liquid cooling plate.

11. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 10.

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