Heat exchange plate and battery pack

Abstract

The utility model relates to a heat exchange plate and a battery pack, the heat exchange plate comprises a first main flow channel, a second main flow channel, a first branch flow channel, a second branch flow channel and a heat exchange unit, the heat exchange unit comprises more than two first heat exchange areas, each first heat exchange area comprises more than two first sub-areas, the first sub-areas are provided with first sub-flow channels distributed in a circuitous mode, and the first sub-flow channels are communicated with the first sub-flow channels. The first sub-flow channels contained in the first heat exchange area communicate with the second sub-flow channels corresponding to the first heat exchange area, and the first sub-flow channels contained in the heat exchange units communicate with the second main flow channel through the same confluence flow channel. The flow resistance of a heat exchange medium flowing through the heat exchange plate can be relatively reduced, and the heat exchange rate of the heat exchange plate is increased.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation technology, and in particular to a heat exchange plate and a battery pack. Background Art

[0002] In recent years, in order to ease the pressure of energy and environmental protection, the new energy vehicle industry has developed rapidly. New energy vehicles have low energy consumption, are environmentally friendly, and have high stability. The market demand is constantly increasing, and they are expected to become the mainstream vehicles in the future. The battery pack is the core component of new energy vehicles, and the thermal management system is an important guarantee for the safety and efficiency of the whole vehicle. Battery thermal management requires a stable operating temperature for the battery, which is a necessary condition for maintaining the capacity and life of the battery. When the battery temperature is too high, it will reduce the battery life and pose a safety risk; when the battery temperature is too low, the battery capacity will decrease, thereby reducing performance. In order to maintain a reasonable battery operating temperature, a scientific and efficient battery thermal management system is necessary.

[0003] At present, the mainstream battery thermal management method is to exchange heat for the battery modules in the battery pack through a heat exchange plate. Specifically, it is necessary to set a flow channel for the flow of heat exchange medium in the heat exchange plate, so that the heat exchange plate and the battery module in the battery pack are in direct contact or indirectly contacted through a heat conductive layer. The heat exchange medium exchanges heat with the battery module during the flow in the flow channel, thereby completing the thermal management of the battery module.

[0004] An existing battery pack generally has multiple groups of battery modules arranged therein, so a heat exchange plate needs to be provided with multiple heat exchange zones, and the multiple heat exchange zones are arranged one-to-one corresponding to the multiple battery modules. The heat exchange medium flowing into the heat exchange plate needs to pass through each heat exchange zone in turn, so the flow resistance of the heat exchange medium is relatively large. Utility Model Content

[0005] The embodiments of the present application provide a heat exchange plate and a battery pack, which can relatively reduce the flow resistance of a heat exchange medium when it flows through the heat exchange plate and improve the heat exchange rate of the heat exchange plate.

[0006] In a first aspect, an embodiment of the present application provides a heat exchange plate, which includes: a first main channel for inputting a heat exchange medium; a second main channel for outputting a heat exchange medium; a first branch channel, at least one first branch channel is provided, one end of the first branch channel is connected to the first main channel, and the other end of the first branch channel is connected to a plurality of second branch channels spaced apart along a first direction; a heat exchange unit, the heat exchange unit is arranged one-to-one with the first branch channel, the heat exchange unit includes more than two first heat exchange areas distributed along the second direction, the second direction intersects with the first direction, the first heat exchange area includes more than two first sub-areas distributed successively along the second direction, the first sub-area is provided with a first sub-channel distributed in a circuitous manner, the first heat exchange area is arranged one-to-one with the second branch channel, the first sub-channels included in the first heat exchange area are all connected to the second branch channels corresponding to the first heat exchange area, and the first sub-channels included in the heat exchange unit are connected to the second main channel through the same converging channel.

[0007] In some embodiments, the first sub-channel includes: a transverse single channel, a plurality of transverse single channels spaced apart along the second direction, the plurality of transverse single channels connected end to end in sequence, one of the plurality of transverse single channels close to the corresponding second branch channel along the second direction is connected to the corresponding second branch channel, and one of the plurality of transverse single channels far away from the corresponding second branch channel along the second direction is connected to the converging channel.

[0008] In some embodiments, the heat exchange unit also includes: a second heat exchange zone, located in the first heat exchange zone along the second direction away from the first branch channel, the second heat exchange zone is provided with a second sub-channel distributed in a circuitous manner, the second sub-channel is connected to the first branch channel through a third branch channel, and the third branch channel and the second branch channel are distributed at intervals; the converging channel includes: a longitudinal converging section, used to connect the first sub-channel, the length direction of the longitudinal converging section is parallel to the second direction; a transverse converging section, located in the second sub-channel along the second direction away from the first heat exchange zone, the two ends of the transverse converging section are respectively connected to the longitudinal converging section and the second main channel, the transverse converging section and the second sub-channel are both located in the second heat exchange zone, the length direction of the transverse converging section is parallel to the first direction, and the second direction is perpendicular to the first direction.

[0009] In some embodiments, in each of two adjacent first heat exchange zones, the width of the corresponding second branch channel of the one closer to the first branch channel is smaller than the width of the corresponding second branch channel of the other; the width of the second branch channel is smaller than the width of the third branch channel.

[0010] In some embodiments, the first heat exchange zone includes two first sub-channels, the number of second sub-channels in the second heat exchange zone is two, and the flow rate of a single second sub-channel is one-half to five-sixths of the flow rate of a single first sub-channel.

[0011] In some embodiments, the first heat exchange zone includes two first sub-flow channels, the number of second sub-flow channels in the second heat exchange zone is one, the flow rate of the second sub-flow channel is five-sixths to seven-sixths of the flow rate of a single first sub-flow channel, the second main flow channel includes at least a first flow segment, the first flow segment is parallel to the transverse merging segment, the first flow segment is located at a position of the transverse merging segment away from the second sub-flow channel along the second direction, and the second sub-flow channel, the transverse merging segment and the first flow segment are all located in the second heat exchange zone.

[0012] In some embodiments, the connection position between the third branch channel and the second sub-channel is located near the transverse confluence section in the second heat exchange area, and the width of the third branch channel near the second sub-channel is greater than the width of the third branch channel near the first branch channel.

[0013] In some embodiments, the width of the converging channel is greater than the width of the first sub-channel, and the width of the second main channel is greater than the width of the converging channel; both the converging channel and the second main channel are provided with spoiler blocks distributed at intervals; the spoiler blocks arranged at the corners of the converging channel and the spoiler blocks arranged at the corners of the second main channel are both columnar structures; the position where the first sub-channel connects to the converging channel is at the interval between two adjacent spoiler blocks.

[0014] In some embodiments, the heat exchange plate is provided with a plurality of dummy flow channels, both ends of the dummy flow channels are closed structures, and the first main flow channel, the second main flow channel, and the heat exchange unit are spaced apart from the dummy flow channels.

[0015] In the second aspect, an embodiment of the present application provides a battery pack, including a heat exchange plate, and also including: a side wall portion, which is surrounded by one side of the heat exchange plate, the side wall portion is fixedly connected to the heat exchange plate, the heat exchange plate is provided with a first liquid hole and a second liquid hole which are spaced apart, one end of the first liquid hole is connected to the first main channel, one end of the second liquid hole is connected to the second main channel, and the first liquid hole and the second liquid hole are both located outside the area surrounded by the side wall portion; a top plate, covering the side of the side wall portion away from the heat exchange plate; a battery module, located in the area surrounded by the side wall portion.

[0016] The present application provides an embodiment of a heat exchange plate and a battery pack, wherein the heat exchange plate includes a first main channel, a second main channel, a first branch channel, a second branch channel and a heat exchange unit, the heat exchange unit includes two or more first heat exchange areas, the first heat exchange area includes two or more first sub-areas, the first sub-areas are provided with first sub-channels distributed in a circuitous manner, the first sub-channels included in the first heat exchange area are all connected to the second branch channels corresponding to the first heat exchange area, and the first sub-channels included in the heat exchange unit are connected to the second main channel through the same converging channel. According to the connection method of each flow channel, different heat exchange units are in parallel, multiple first heat exchange areas contained in each heat exchange unit are in parallel, and multiple first sub-flow channels contained in each first heat exchange area are in parallel. Since a multi-stage parallel structure is provided, the flow resistance of the heat exchange medium when flowing through the heat exchange plate can be relatively reduced; when the same flow channel pressure is generated during the flow of the heat exchange medium, the lower flow resistance can make the flow rate of the heat exchange medium relatively large, thereby relatively improving the heat exchange rate of the heat exchange plate; since the first heat exchange areas are in parallel, the heat exchange capacity of each first heat exchange area is basically the same, so that the heat exchange capacity of each first heat exchange area has a high consistency; since the multiple first sub-flow channels contained in each first heat exchange area are in parallel, the heat exchange capacity of each first sub-area is basically the same, so that the heat exchange capacity of different first sub-areas in each first heat exchange area has a high consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of the exploded structure of a heat exchange plate provided in some embodiments of the present application;

[0019] Figure 2 A schematic diagram of a board structure provided for some embodiments of the present application;

[0020] Figure 3 A schematic diagram of the heat exchange unit structure provided in some embodiments of the present application;

[0021] Figure 4 A schematic diagram of heat exchange unit partitions provided for some embodiments of the present application;

[0022] Figure 5 A schematic diagram of the first heat exchange zone provided in some embodiments of the present application;

[0023] Figure 6 Another heat exchange unit partition schematic diagram provided for some embodiments of the present application;

[0024] Figure 7 Schematic diagram of the exploded structure of a battery pack provided for some embodiments of the present application.

[0025] In the figure: 1, heat exchange plate; 101, plate body; 102, cover body; 2, first main flow channel; 3, second main flow channel; 301, first flow section; 4, converging flow channel; 401, longitudinal converging section; 402, transverse converging section; 5, spoiler; 6, false flow channel; 7, first branch flow channel; 8, heat exchange unit; 801, first heat exchange area; 8011, first sub-area; 802, second heat exchange area; 9, second branch flow channel; 10, third branch flow channel; 11, second sub-flow channel; 12, first sub-flow channel; 1201, transverse single flow channel; 13, first joint; 14, second joint; 15, first liquid hole; 16, second liquid hole; 17, top plate; 18, battery module; 19, side wall; 20, heat conductive layer; 21, bottom guard plate; 22, longitudinal beam; 23, transverse beam; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0028] At present, the mainstream battery thermal management method is to exchange heat for the battery modules in the battery pack through a heat exchange plate. Specifically, it is necessary to set a flow channel for the flow of heat exchange medium in the heat exchange plate, so that the heat exchange plate and the battery module in the battery pack are in direct contact or indirectly contacted through a heat conductive layer. The heat exchange medium exchanges heat with the battery module during the flow in the flow channel, thereby completing the thermal management of the battery module.

[0029] The inventors of the present application have discovered that an existing battery pack generally has multiple groups of battery modules arranged therein, and therefore a heat exchange plate needs to be provided with multiple heat exchange zones, with the multiple heat exchange zones being arranged one-to-one corresponding to the multiple battery modules, and the heat exchange medium flowing into the heat exchange plate needs to pass through each heat exchange zone in turn, and therefore the flow resistance of the heat exchange medium is relatively large.

[0030] In order to solve the problems in the prior art, the present application provides a heat exchange plate and a battery pack, which are described in detail below in conjunction with the accompanying drawings.

[0031] Figure 1 A schematic diagram of the exploded structure of the heat exchange plate 1 provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of a board 101 provided in some embodiments of the present application; Figure 3 A schematic diagram of the structure of a heat exchange unit 8 provided in some embodiments of the present application; Figure 4 A schematic diagram of the partitioning of the heat exchange unit 8 provided in some embodiments of the present application; Figure 5 A schematic diagram of the partitioning of the first heat exchange area 801 provided in some embodiments of the present application; Figure 6 Another schematic diagram of partitioning of a heat exchange unit 8 provided in some embodiments of the present application.

[0032] See also Figures 1 to 6 The embodiment of the present application provides a heat exchange plate 1, comprising a first main channel 2, a second main channel 3, a first branch channel 7, a second branch channel 9 and a heat exchange unit 8. The first main channel 2 is used to input a heat exchange medium, and the second main channel 3 is used to output a heat exchange medium. At least one first branch channel 7 is provided, one end of the first branch channel 7 is connected to the first main channel 2, and the other end of the first branch channel 7 is connected to a plurality of second branch channels 9 spaced apart along a first direction X; the heat exchange unit 8 is arranged one-to-one with the first branch channel 7. Specifically, in the present embodiment, the number of the first branch channels 7 and the number of the heat exchange units 8 are both two. The heat exchange unit 8 includes more than two first heat exchange areas 801 distributed along the second direction Y, the second direction Y intersects with the first direction X, the first heat exchange area 801 includes more than two first sub-areas 8011 distributed successively along the second direction Y, and the first sub-areas 8011 are provided with first sub-flow channels 12 distributed in a circuitous manner. Specifically, in this embodiment, the number of first heat exchange areas 801 included in each heat exchange unit 8 and the number of first sub-areas 8011 included in each first heat exchange area 801 are both two. The first heat exchange areas 801 are arranged in one-to-one correspondence with the second branch flow channels 9, and the first sub-flow channels 12 included in the first heat exchange area 801 are all connected to the second branch flow channels 9 corresponding to the first heat exchange area 801, and the first sub-flow channels 12 included in the heat exchange unit 8 are connected to the second main flow channel 3 through the same converging flow channel 4.

[0033] It should be noted that if Figures 1 to 6 As shown, the heat exchange plate 1 is composed of a plate body 101 and a cover body 102. Each of the first main flow channel 2, the second main flow channel 3, the first branch flow channel 7, the second branch flow channel 9, the first sub-flow channel 12, the converging flow channel 4, and the third branch flow channel 10, the second sub-flow channel 11, and the dummy flow channel 6 mentioned later are all open flow channels arranged on one side of the plate body 101. When the cover body 102 is covered on the plate body 101, the plate body 101 and the cover body 102 together form a channel for the heat exchange medium to flow. Among them, the first main flow channel 2, the second main flow channel 3, the first branch flow channel 7, the second branch flow channel 9, the first sub-flow channel 12, the converging flow channel 4, and the third branch flow channel 10, the second sub-flow channel 11, and the dummy flow channel 6 mentioned later on the plate body 101 can be formed by stamping, and the cover body 102 and the plate body 101 can be welded by brazing. The heat exchange plate 1 can be made of a three-series aluminum composite material, which has the advantages of good welding performance and good plasticity, and can be stamped and formed for complex flow channel designs. Figures 3 to 6As shown, the heat exchange unit 8, the first heat exchange area 801, the first sub-area 8011 and the second heat exchange area 802 mentioned later are all areas divided by virtual dotted lines on the plate body 101. In the physical structure, there is no visible dotted line for dividing the first area and the second area.

[0034] According to the connection mode of each flow channel, different heat exchange units 8 are in parallel, multiple first heat exchange areas 801 included in each heat exchange unit 8 are in parallel, and multiple first sub-flow channels 12 included in each first heat exchange area 801 are in parallel. Since a multi-stage parallel structure is provided, the flow resistance of the heat exchange medium when flowing through the heat exchange plate 1 can be relatively reduced; when the same flow channel pressure is generated during the flow of the heat exchange medium, the lower flow resistance can make the flow rate of the heat exchange medium relatively large, thereby relatively improving the heat exchange rate of the heat exchange plate 1; since each first heat exchange area 801 is in parallel, the heat exchange capacity of each first heat exchange area 801 is basically the same, so that the heat exchange capacity of each first heat exchange area 801 has a high consistency; since the multiple first sub-flow channels 12 included in each first heat exchange area 801 are in parallel, the heat exchange capacity of each first sub-area 8011 is basically the same, so that the heat exchange capacity of different first sub-areas 8011 in each first heat exchange area 801 has a high consistency.

[0035] like Figure 4 and Figure 5 As shown, in some embodiments, the first sub-flow channel 12 includes a plurality of transverse single flow channels 1201, the plurality of transverse single flow channels 1201 are spaced apart along the second direction Y, the plurality of transverse single flow channels 1201 are connected end to end in sequence, one of the plurality of transverse single flow channels 1201 close to the corresponding second branch flow channel 9 along the second direction Y is connected to the corresponding second branch flow channel 9, and one of the plurality of transverse single flow channels 1201 away from the corresponding second branch flow channel 9 along the second direction Y is connected to the converging flow channel 4. In the process of the heat exchange medium flowing through the first sub-flow channel 12, since the heat exchange medium will exchange heat with the battery module 18 at the corresponding position, the temperature of the heat exchange medium will gradually approach the temperature of the battery module 18 at the corresponding position, that is, the heat exchange capacity of the heat exchange medium will gradually weaken in the process of flowing through the first sub-flow channel 12. Therefore, along the second direction Y from close to the second branch channel 9 to the direction away from the second branch channel 9, the heat exchange capacity of the first heat exchange zone 801 changes from strong to weak and then from strong to weak. That is to say, the strength of the heat exchange capacity of the first heat exchange zone 801 is alternately distributed along the second direction Y, so that the heat exchange capacity of different areas in the first heat exchange zone 801 is relatively balanced.

[0036] like Figure 3 , Figure 4 and Figure 6As shown, in some embodiments, the heat exchange unit 8 further includes a second heat exchange area 802, which is located at a position of the first heat exchange area 801 away from the first branch channel 7 along the second direction Y, and the second heat exchange area 802 is provided with a second sub-channel 11 distributed in a circuitous manner, and the second sub-channel 11 is connected to the first branch channel 7 through the third branch channel 10, and the third branch channel 10 is spaced apart from the second branch channel 9. The confluence channel 4 includes a longitudinal confluence section 401 and a transverse confluence section 402. The longitudinal merging section 401 is used to connect the first sub-channel 12, and the length direction of the longitudinal merging section 401 is parallel to the second direction Y; the transverse merging section 402 is located at a position of the second sub-channel 11 away from the first heat exchange zone 801 along the second direction Y, and the two ends of the transverse merging section 402 are respectively connected to the longitudinal merging section 401 and the second main channel 3, and the transverse merging section 402 and the second sub-channel 11 are both located in the second heat exchange zone 802. The second heat exchange zone 802 is jointly constituted by the transverse merging section 402 and the second sub-channel 11. While ensuring the heat exchange capacity of the second heat exchange zone 802, the channel integration of the heat exchange plate 1 can be relatively improved, and each first heat exchange zone 801 and the second heat exchange zone 802 are relatively independently designed, which can also effectively reduce the iteration cycle of the development of the heat exchange plate 1.

[0037] like Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, the length direction of the transverse converging section 402 is parallel to the first direction X, and the second direction Y is perpendicular to the first direction X, which can further improve the flow channel integration of the heat exchange plate 1.

[0038] like Figure 3 , Figure 4 and Figure 6 As shown, in some embodiments, in each of two adjacent first heat exchange areas 801, the width of the corresponding second branch channel 9 of the one closer to the first branch channel 7 is smaller than the width of the corresponding second branch channel 9 of the other; the width of the second branch channel 9 is smaller than the width of the third branch channel 10. By controlling the width of each second branch channel 9 and the width of the third branch channel 10 respectively, the flow distribution of each first heat exchange area 801 and the second heat exchange area 802 can be more accurately controlled to ensure the consistency of the heat exchange capacity of each first heat exchange area 801 and the second heat exchange area 802.

[0039] like Figure 6 As shown, in some embodiments, the first heat exchange area 801 includes two first sub-flow channels 12, the number of second sub-flow channels 11 in the second heat exchange area 802 is two, and the flow of a single second sub-flow channel 11 is one-half to five-sixths of the flow of a single first sub-flow channel 12. By limiting the number and flow of the second sub-flow channels 11, combined with the transverse confluence section 402, the heat exchange capacity of the first heat exchange area 801 and the second heat exchange area 802 can be made substantially the same.

[0040] like Figure 4 As shown, in some embodiments, the first heat exchange area 801 includes two first sub-flow channels 12, the number of the second sub-flow channels 11 in the second heat exchange area 802 is one, the flow of the second sub-flow channel 11 is five-sixths to seven-sixths of the flow of a single first sub-flow channel 12, the second main flow channel 3 includes at least a first flow segment 301, the first flow segment 301 is parallel to the transverse confluence segment 402, the first flow segment 301 is located at a position of the transverse confluence segment 402 away from the second sub-flow channel 11 along the second direction Y, and the second sub-flow channel 11, the transverse confluence segment 402 and the first flow segment 301 are all located in the second heat exchange area 802. By limiting the number and flow of the second sub-flow channels 11, and combining the transverse confluence segment 402 and the first flow segment 301, the heat exchange capacity of the first heat exchange area 801 and the second heat exchange area 802 can be made substantially the same.

[0041] It should be noted that, for the multiple heat exchange units 8 included in the same heat exchange plate 1, the following can be used: Figure 6 The second heat exchange zone 802 shown has two second sub-channels 11; Figure 4 The second heat exchange zone 802 shown has a second sub-channel 11; a part of the heat exchange unit 8 may also be used as Figure 6 The second heat exchange zone 802 shown in FIG. 1 has two second sub-channels 11, and the other part of the heat exchange unit 8 adopts the following method: Figure 4 The indicated second heat exchange zone 802 has the form of a second sub-channel 11 .

[0042] like Figure 4 and Figure 6 As shown, in some embodiments, the junction position of the third branch flow channel 10 and the second sub-flow channel 11 is located in the second heat exchange area 802 near the transverse confluence section 402, and the width of the third branch flow channel 10 near the second sub-flow channel 11 is greater than the width of the third branch flow channel 10 near the first branch flow channel 7. Since the third branch flow channel 10 near the second sub-flow channel 11 is located in the second heat exchange area 802, the heat exchange area of ​​the second heat exchange area 802 can be increased by increasing the width of the third branch flow channel 10 at this position.

[0043] like Figure 2 and Figure 5 As shown, in some embodiments, the width of the converging channel 4 is greater than the width of the first sub-channel 12, and the width of the second main channel 3 is greater than the width of the converging channel 4. By relatively increasing the widths of the converging channel 4 and the second main channel 3, the flow resistance can be further reduced.

[0044] like Figure 2As shown, in some embodiments, spoiler blocks 5 are provided at intervals in the converging channel 4, in the second main channel 3 and in the third branch channel 10 near the second sub-channel 11, which can further distribute the flow of the heat exchange medium, reduce the uneven flow distribution at different positions in the converging channel 4, different positions in the second main channel 3 and the third branch channel 10 near the second sub-channel 11, and enhance the heat exchange effect.

[0045] like Figure 2 As shown, in some embodiments, the spoiler blocks 5 arranged at the corners of the converging flow channel 4 and the spoiler blocks 5 arranged at the corners of the second main flow channel 3 are both columnar structures, so that the flow distribution of the heat exchange medium after passing the corners is as uniform as possible.

[0046] like Figure 2 As shown, the position where the first sub-channel 12 connects to the converging channel 4 is located at the interval between two adjacent spoiler blocks 5, so that the flow distribution of the heat exchange medium on both sides of the spoiler blocks 5 is as uniform as possible.

[0047] like Figure 2 and Figure 3 As shown, in some embodiments, the heat exchange plate 1 is provided with a plurality of dummy flow channels 6, the two ends of the dummy flow channels 6 are in a closed structure, and the first main flow channel 2, the second main flow channel 3, and the heat exchange unit 8 are spaced apart from the dummy flow channels 6. When the plate body 101 and the cover body 102 constituting the heat exchange plate 1 are fixedly connected by welding, if there is a large area in the plane area where the plate body 101 and the cover body 102 are continuously abutted, the abutting area is prone to air bulging during welding, which will have an adverse effect on the welding quality. It should be noted that in some embodiments, if the length and width of the area where the plate body 101 and the cover body 102 are continuously abutted are both above 50 mm, it can be considered that there is a large area in the plane area where the plate body 101 and the cover body 102 are continuously abutted. By providing the dummy flow channel 6, the air bulging phenomenon can be avoided when the non-flow channel area is welded, and the structural strength of the heat exchange plate 1 can be improved.

[0048] Figure 7 Schematic diagram of the exploded structure of a battery pack provided for some embodiments of the present application.

[0049] like Figure 7As shown, an embodiment of the present application further provides a battery pack, comprising the heat exchange plate 1 in the above embodiment, and further comprising a side wall portion 19 , a top plate 17 and a battery module 18 . Among them, the side wall portion 19 is surrounded on one side of the heat exchange plate 1, and the side wall portion 19 is fixedly connected to the heat exchange plate 1. The heat exchange plate 1 is provided with a first liquid hole 15 and a second liquid hole 16 distributed at intervals. One end of the first liquid hole 15 is connected to the first main channel 2, and the other end of the first liquid hole 15 is used to input heat exchange medium. One end of the second liquid hole 16 is connected to the second main channel 3, and the other end of the second liquid hole 16 is used to output heat exchange medium. The first liquid hole 15 and the second liquid hole 16 are both located outside the area surrounded by the side wall portion 19; the top plate 17 covers the side of the side wall portion 19 away from the heat exchange plate 1; the battery module 18 is located in the area surrounded by the side wall portion 19, and the multiple battery modules 18 are divided into multiple groups. A group of battery modules 18 is arranged at the corresponding position of each first heat exchange area 801 and the corresponding position of each second heat exchange area 802.

[0050] In the prior art, it is generally necessary to set a bottom plate on the side of the side wall 19 away from the top plate 17. In the present technical solution, the heat exchange plate 1 can replace the bottom plate to achieve the sealing of the battery pack. At the same time, the flow channels of the heat exchange plate 1 can play a certain role in supporting and improving the strength. In addition, the first liquid hole 15 and the second liquid hole 16 are arranged outside the side wall 19, so there are no pipeline interfaces and leakage risk points of the heat exchange medium in the battery pack, so that the battery pack has a higher safety. It should be noted that since the battery pack includes the heat exchange plate 1 in the above embodiment, it has at least all the beneficial effects brought by the above embodiment, which will not be repeated here.

[0051] like Figure 1 As shown, in some embodiments, the cover body 102 is welded with a first joint 13 and a second joint 14 on the side facing away from the plate body 101, and through holes are provided in the middle of the first joint 13 and the second joint 14. One end of the through hole corresponding to the first joint 13 is connected to the first liquid hole 15, and one end of the second joint 14 is connected to the second liquid hole 16. By providing the first joint 13 and the second joint 14, it is convenient for the external water channel to be connected to the first main channel 2 and the second main channel 3.

[0052] like Figure 7As shown, in some embodiments, a crossbeam 23 and a longitudinal beam 22 are fixedly connected in the area enclosed by the side wall portion 19, and the crossbeam 23 and the longitudinal beam 22 are staggered, which can limit each group of battery modules 18 in a preset area, and can improve the structural stability of the battery pack; a heat-conducting layer 20 is provided between the battery module 18 and the heat exchange plate 1, and the heat-conducting layer 20 can be a heat-conducting glue or a heat-conducting gel, which can further improve the consistency of the heat exchange capacity of each part of the first heat exchange area 801 and each part of the second heat exchange area 802; a bottom guard plate 21 is fixedly connected to the side of the heat exchange plate 1 facing away from the top plate 17, which can protect the bottom of the battery pack and effectively reduce the risk of deformation of the battery pack caused by external impact on the bottom of the battery pack. It should be noted that the bottom guard plate 21 can be directly fixed to the heat exchange plate 1 by bonding or other methods; the bottom guard plate 21 can also be directly fixed to the side wall portion 19 by bolting or riveting, and indirectly fixed to the bottom guard plate 21 through the side wall portion 19.

[0053] The working principle of a heat exchange plate 1 provided in the present application is that the liquid outlet pipe of the external water circuit inputs the heat exchange medium with a lower temperature into the first main channel 2 through the first joint 13 and the first liquid hole 15, the heat exchange medium is branched to different first branch channels 7 through the first main channel 2, the heat exchange medium in each first branch channel 7 is further branched to the first sub-channel 12 in the corresponding first heat exchange area 801 through the second branch channel 9, the heat exchange medium in each first branch channel 7 is further branched to the second sub-channel 11 in the corresponding second heat exchange area 802 through the third branch channel 10, the heat exchange medium flowing through the first sub-channel 12 and the second sub-channel 11 in each heat exchange unit 8 flows to the second main channel 3 through the converging channel 4 of the corresponding heat exchange unit 8, and the heat exchange medium flowing through the second main channel 3 flows out to the return pipe of the external water circuit through the second liquid hole 16 and the second joint 14. When the heat exchange medium flows through the first heat exchange area 801 and the second heat exchange area 802 , it will have a better heat dissipation effect on the corresponding areas and take away part of the heat of the corresponding areas.

[0054] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A heat exchange plate, characterized in that: include: The first main channel is used to input heat exchange medium; The second main channel is used to output the heat exchange medium; A first branch flow channel, at least one of which is provided, one end of which is connected to the first main flow channel, and the other end of which is connected to a plurality of second branch flow channels spaced apart and distributed along a first direction; A heat exchange unit, wherein the heat exchange unit is arranged in a one-to-one correspondence with the first branch channel, the heat exchange unit includes more than two first heat exchange areas distributed along a second direction, the second direction intersects with the first direction, the first heat exchange area includes more than two first sub-areas distributed successively along the second direction, the first sub-area is provided with a first sub-channel distributed in a circuitous manner, the first heat exchange area is arranged in a one-to-one correspondence with the second branch channel, the first sub-channels contained in the first heat exchange area are all connected to the second branch channel corresponding to the first heat exchange area, and the first sub-channels contained in the heat exchange unit are connected to the second main channel through the same converging channel.

2. The heat exchange plate according to claim 1, characterized in that: The first sub-channel comprises: A transverse single flow channel, wherein a plurality of the transverse single flow channels are spaced apart along the second direction, the plurality of the transverse single flow channels are connected end to end in sequence, one of the plurality of the transverse single flow channels that is close to the corresponding second branch flow channel along the second direction is connected to the corresponding second branch flow channel, and one of the plurality of the transverse single flow channels that is far from the corresponding second branch flow channel along the second direction is connected to the converging flow channel.

3. The heat exchange plate according to claim 1, characterized in that: The heat exchange unit also includes: a second heat exchange zone, located at a position of the first heat exchange zone away from the first branch flow channel along the second direction, the second heat exchange zone is provided with a second sub-flow channel distributed in a circuitous manner, the second sub-flow channel is connected to the first branch flow channel through a third branch flow channel, and the third branch flow channel is spaced apart from the second branch flow channel; The confluence flow channel comprises: A longitudinal converging section, used for connecting the first sub-channel, wherein the length direction of the longitudinal converging section is parallel to the second direction; A transverse merging section is located at a position of the second sub-channel away from the first heat exchange zone along the second direction, and both ends of the transverse merging section are respectively connected to the longitudinal merging section and the second main channel. The transverse merging section and the second sub-channel are both located in the second heat exchange zone, and the length direction of the transverse merging section is parallel to the first direction, and the second direction is perpendicular to the first direction.

4. The heat exchange plate according to claim 3, characterized in that: In each of two adjacent first heat exchange areas, the width of the corresponding second branch channel of the one closer to the first branch channel is smaller than the width of the corresponding second branch channel of the other one; the width of the second branch channel is smaller than the width of the third branch channel.

5. The heat exchange plate according to claim 3, characterized in that: The first heat exchange zone includes two first sub-flow channels, the number of the second sub-flow channels in the second heat exchange zone is two, and the flow rate of a single second sub-flow channel is one half to five sixths of the flow rate of a single first sub-flow channel.

6. The heat exchange plate according to claim 3, characterized in that: The first heat exchange zone includes two of the first sub-flow channels, the number of the second sub-flow channels in the second heat exchange zone is one, the flow rate of the second sub-flow channel is five-sixths to seven-sixths of the flow rate of a single first sub-flow channel, the second main flow channel includes at least a first flow segment, the first flow segment is parallel to the transverse merging segment, the first flow segment is located at a position of the transverse merging segment away from the second sub-flow channel along the second direction, and the second sub-flow channel, the transverse merging segment and the first flow segment are all located in the second heat exchange zone.

7. The heat exchange plate according to claim 3, characterized in that: The connecting position of the third branch channel and the second sub-channel is located in the second heat exchange zone close to the transverse confluence section, and the width of the third branch channel close to the second sub-channel is greater than the width of the third branch channel close to the first branch channel.

8. The heat exchange plate according to claim 1, characterized in that: The width of the converging flow channel is greater than the width of the first sub-flow channel, and the width of the second main flow channel is greater than the width of the converging flow channel; The converging flow channel and the second main flow channel are both provided with spoilers distributed at intervals; The spoiler block arranged at the corner position of the converging flow channel and the spoiler block arranged at the corner position of the second main flow channel are both in a columnar structure; The position where the first sub-flow channel is connected to the converging flow channel is located at the interval between two adjacent spoiler blocks.

9. The heat exchange plate according to claim 1, characterized in that: The heat exchange plate is provided with a plurality of dummy flow channels, both ends of the dummy flow channels are in a closed structure, and the first main flow channel, the second main flow channel, and the heat exchange unit are spaced apart from the dummy flow channels.

10. A battery pack, characterized in that: The heat exchange plate according to any one of claims 1 to 9, further comprising: A side wall portion is arranged around one side of the heat exchange plate, the side wall portion is fixedly connected to the heat exchange plate, the heat exchange plate is provided with a first liquid passage hole and a second liquid passage hole distributed at intervals, one end of the first liquid passage hole is connected to the first main flow channel, one end of the second liquid passage hole is connected to the second main flow channel, and the first liquid passage hole and the second liquid passage hole are both located outside the area surrounded by the side wall portion; A top plate, covering a side of the side wall away from the heat exchange plate; The battery module is located in the area surrounded by the side wall portion.

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