Power battery cooling system, battery pack and vehicle

Abstract

The invention discloses a power battery cooling system, a battery pack and a vehicle. The power battery cooling system comprises a first cooling subsystem, a second cooling subsystem and a pipeline group, wherein the first cooling subsystem comprises a first sub-runner, a first liquid inlet interface and a first liquid return interface; the first liquid inlet connector is communicated with an inlet of the first sub-runner, and the first liquid return connector is communicated with an outlet of the first sub-runner; the second cooling subsystem comprises a second sub-runner, a total sub-area, a total return area, a second liquid inlet interface, a second liquid return interface, a third liquid inlet interface and a third liquid return interface; the total sub-area is communicated with an inlet of the second sub-runner, and the total return area is communicated with an outlet of the second sub-runner; the second liquid inlet interface and the third liquid inlet interface are respectively communicated with the main sub-area, and the second liquid return interface and the third liquid return interface are respectively communicated with the main return area. According to the arrangement, on the basis that good heat dissipation efficiency is guaranteed, the uniformity degree of liquid cooling flow distribution at the bottom and the top is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a power battery cooling system, a battery pack and a vehicle. Background Art

[0002] Typically, battery packs are used to provide a power source for electric devices. Taking electric vehicles as an example, battery packs are composed of a certain number of cells arranged in a certain way. For the cells assembled in the battery pack, good heat dissipation needs to be provided to obtain reliable and stable thermal management, thereby ensuring the performance, stability and service life of the entire battery pack. A typical solution is to configure cooling systems at the bottom and top of the battery pack. The bottom cooling system and the top cooling system are usually connected in series or in parallel in the liquid cooling system. For the series cooling solution, the system flow resistance is large, which affects the system heat dissipation efficiency; for the parallel cooling solution, the shunt pipeline setting is more complicated, and there is a problem of uneven flow distribution.

[0003] In view of this, it is urgent to provide a solution for cooling the existing battery pack to overcome the above-mentioned defects. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a power battery cooling system, a battery pack and a vehicle. Through the system optimization of the battery pack cooling solution, the uniformity of the liquid cooling flow distribution at the bottom and top is effectively improved while ensuring good heat dissipation efficiency.

[0005] A first aspect of the present invention provides a power battery cooling system, which includes a first cooling subsystem, a second cooling subsystem and a pipeline group; the first cooling subsystem and the second cooling subsystem respectively have a heat exchange width, one of the first cooling subsystem and the second cooling subsystem is arranged at the top of the battery pack, and the other is arranged at the bottom of the battery pack; the first cooling subsystem includes a first branch channel, a first liquid inlet interface and a first liquid return interface; the first liquid inlet interface is connected to the inlet of the first branch channel, and the first liquid return interface is connected to the outlet of the first branch channel; the second cooling subsystem includes a second branch channel, a total branch area, a total return area, a second liquid inlet interface, a second liquid return interface, a third liquid inlet interface and a third liquid return interface; the total branch area is connected to the inlet of the second branch channel, and the total return area is connected to the outlet of the second branch channel; the second liquid inlet interface and the third liquid inlet interface are respectively connected to the total branch area, and the second liquid return interface and the third liquid return interface are respectively connected to the total return area; the third liquid inlet interface and the first liquid inlet interface, as well as the first liquid return interface and the third liquid return interface are respectively connected through the pipeline group. With such an arrangement, the two subsystems (the first cooling subsystem and the second cooling subsystem) for top cooling and bottom cooling are coupled in series and parallel. Based on the total branch area configured on the second cooling subsystem (bottom cold plate) side, uniform branching of the second branch channel on its own side and uniform branching to the first branch channel on the first cooling subsystem (top cooling system) side can be achieved. At the same time, based on the total return area configured on the second cooling subsystem side, reflux of the second branch channel on its own side and reflux of the first branch channel on the first cooling subsystem side can be achieved. The two subsystems are able to obtain a coolant flow that tends to be evenly distributed within the heat exchange width, thereby ensuring good heat dissipation efficiency.

[0006] Based on the first aspect, the present invention also provides a first implementation manner of the first aspect: the pipeline group is located on the same end side as the first liquid inlet interface and the first liquid return interface of the first cooling subsystem, and the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface of the second cooling subsystem. In this way, the pipeline group and the interfaces on the first cooling subsystem side and the second cooling subsystem side are configured on the same end side. For example, but not limited to, the pipeline group can be arranged above the total branch area and the total return area of ​​the first cooling subsystem, which can effectively improve the integration and further avoid the adverse effects of the complex shunt pipeline on the flow resistance. In addition, with the help of the pipeline group located on the same end side as the total branch area and the total return area, the flow resistance of the entire power battery cooling system can be effectively reduced, further improving the heat dissipation efficiency.

[0007] Based on the first aspect, or the first embodiment of the first aspect, the present invention also provides a second embodiment of the first aspect: the first cooling subsystem includes multiple groups of cold plate components, the second shunt channel is formed inside each cold plate component, and the cold plate component is provided with a first liquid inlet interface and a first liquid return interface; each cold plate component is arranged in sequence along the second direction to construct a heat exchange width of the first cooling subsystem. Exemplarily, the number of cold plate components can be selected as needed, such as but not limited to two or more, which can improve the uniformity of the shunt between the cold plate components.

[0008] Based on the second embodiment of the first aspect, the present invention also provides a third embodiment of the first aspect: the cold plate assembly includes a first current collector, a second current collector, a shunt harmonica tube and a reflux harmonica tube, one end of the shunt harmonica tube and the reflux harmonica tube is inserted into the first current collector, and the other end is inserted into the second current collector; the tube bodies of the shunt harmonica tube and the reflux harmonica tube are respectively extended along the first direction, and are sequentially spaced in the second direction; the first liquid inlet interface and the first liquid return interface are arranged on the first current collector; wherein the first direction and the second direction are two directions within the battery cell arrangement plane. In practical applications, the first current collector may include a first cavity and a second cavity that are separated, the first liquid inlet interface and the shunt harmonica tube are connected to the first cavity of the first current collector, and the first liquid return interface and the reflux harmonica tube are connected to the second cavity of the first current collector. In this way, the low-temperature coolant can enter the first cavity of the first collector through the first liquid inlet interface, and flow into the diversion harmonica tube. After reaching the second collector, it flows back to the second cavity of the first collector through the reflux harmonica tube. The high-temperature coolant that completes the heat exchange flows out through the first return liquid interface, which can further improve the diversion uniformity.

[0009] Based on the third embodiment of the first aspect, the present invention further provides a fourth embodiment of the first aspect: the number of first cavities of the first current collector is two, and they are disposed on both sides of the second cavity of the first current collector. Overall, on the basis of obtaining good flow distribution uniformity, the flow resistance in the cold plate assembly can be further reasonably controlled.

[0010] Based on the fourth embodiment of the first aspect, the present invention also provides a fifth embodiment of the first aspect: the second collector includes a first cavity and a second cavity that are separated and arranged, and the number of the shunt harmonica tubes and the reflux harmonica tubes are both multiple, and in the second direction, a part of the multiple shunt harmonica tubes and the multiple reflux harmonica tubes are connected to the first cavity of the second collector, and the other part is connected to the second cavity of the second collector. In this way, turbulence that affects the flow of the coolant can be avoided in the second collector, thereby improving the heat exchange efficiency.

[0011] Based on the first aspect, the present invention also provides a sixth implementation of the first aspect: the second cooling subsystem includes a flow channel plate and a temperature averaging plate, the flow channel plate includes grooves corresponding to the second branch flow channel, the total branch area and the total return area, the temperature averaging plate overlaps the surface of the flow channel plate with the grooves, enclosing the second branch flow channel, the total branch area and the total return area; the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface are arranged on the temperature averaging plate, and the temperature averaging plate constructs the heat exchange width of the second cooling subsystem. It has the characteristics of simple and compact structure and excellent temperature averaging effect.

[0012] In practical applications, the number of the third liquid inlet interfaces and the third liquid return interfaces is the same as the number of the cold plate components of the first cooling subsystem.

[0013] Based on the sixth implementation of the first aspect, the present invention further provides a seventh implementation of the first aspect: in the first direction, the total branch area is arranged close to the second branch channel, and the total return area is located on a side of the total branch area away from the second branch channel. This arrangement makes full use of the available space and has a good degree of integration.

[0014] Based on the seventh embodiment of the first aspect, the present invention also provides an eighth embodiment of the first aspect: the second branch flow channel includes a plurality of sub-flow channels, and in the second direction, the upstream flow channel section with an inlet of each sub-flow channel is located in the middle area of ​​the heat dissipation width, and the downstream flow channel section with an outlet of each sub-flow channel is located on both sides of the heat dissipation width. In this way, the low-temperature coolant entering each sub-flow channel through the inlet first cools and dissipates the battery cells in the middle with relatively poor heat dissipation conditions, and then cools and dissipates the battery cells on the side, thereby avoiding thermal runaway. On the whole, each battery cell can reach a consistent temperature.

[0015] Exemplarily, in the second direction Y, the inlets of each sub-channel of the second branch channel can be located in the middle, and correspondingly, the outlets of each sub-channel of the second branch channel are respectively located on both sides of the inlet, and the total return area surrounds the two end sides of the total branch area in the second direction to be connected with each outlet of the second branch channel respectively.

[0016] Based on the eighth embodiment of the first aspect, the present invention also provides a ninth embodiment of the first aspect: the pipeline group also includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, one end of the first pipeline is connected to the second liquid inlet interface, and the other end is used to communicate with the output pipeline of the system liquid cooling circuit; one end of the second pipeline is connected to the second liquid return interface, and the other end is used to communicate with the recovery pipeline of the system liquid cooling circuit; the third pipeline is connected between the third liquid inlet interface and the first liquid inlet interface, and the fourth pipeline is connected between the first liquid return interface and the third liquid return interface. In this way, a pipeline group with an external connection pipeline is formed, which has good operability.

[0017] Exemplarily, in the first direction X, the pipeline group is located on the same end side as the first liquid inlet interface and the first liquid return interface of the first cooling subsystem, and the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface of the second cooling subsystem.

[0018] A second aspect of the present invention provides a battery pack, which includes a plurality of battery cells arranged in sequence and the cooling system as described above.

[0019] A third aspect of the present invention provides a vehicle, the vehicle comprising a battery pack, the battery pack being the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of a battery pack provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 Schematic diagram of the assembly explosion of the power battery cooling system shown in;

[0022] Figure 3 An axial schematic diagram of a cold plate assembly of a first cooling subsystem provided in an embodiment of the present application;

[0023] Figure 4 An exploded schematic diagram of the assembly of a second cooling subsystem provided in an embodiment of the present application;

[0024] Figure 5 for Figure 4 A front view of the temperature homogenizing plate shown in FIG.

[0025] Figure 6 for Figure 4 A front view of the flow channel plate shown in;

[0026] Figure 7 An axonometric diagram of a pipeline group provided in an embodiment of the present application;

[0027] Figure 8 for Figure 3 AA section view in;

[0028] Fig. 9 for Figure 3 BB section view in;

[0029] Fig.10 An exploded schematic diagram of the assembly of a first pipeline provided in an embodiment of the present application;

[0030] Fig.11 An exploded schematic diagram of the assembly of a second pipeline provided in an embodiment of the present application;

[0031] Fig.12An axonometric view of a flange provided in an embodiment of the present application;

[0032] Fig.13 for Fig.12 Schematic diagram of the assembly relationship between the flange and the battery pack shown in;

[0033] Fig.14 An exploded schematic diagram of the assembly of a third pipeline provided in an embodiment of the present application;

[0034] Fig.15 An exploded schematic diagram of the assembly of a fourth pipeline provided in an embodiment of the present application.

[0035] In the figure:

[0036] Battery pack 100, cooling system 10, box frame 20, protective plate 30;

[0037] The first cooling subsystem 1, the first shunt channel 11, the first current collector 111, the first blocking piece 1111, the second current collector 112, the second blocking piece 1121, the shunt harmonica tube 113, the reflux harmonica tube 114, the first liquid inlet interface 12, and the first liquid return interface 13;

[0038] The second cooling subsystem 2, the flow channel plate 211, the temperature balancing plate 212, the second branch flow channel 21, the total branch area 22, the total return area 23, the second liquid inlet interface 25, the second liquid return interface 26, the third liquid inlet interface 27, the third liquid return interface 28, the reinforcing groove 29, and the reinforcing rib 210;

[0039] Pipeline group 3, first pipeline 31, first pipeline first female plug 311, first pipeline connecting pipe 312, first pipeline second female plug 313, first pipeline fireproof sheath 314, second pipeline 32, second pipeline first female plug 321, second pipeline connecting pipe 322, second pipeline second female plug 323, second pipeline fireproof sheath 324, third pipeline 33, third pipeline first female plug 331, third pipeline connecting pipe 332, third pipeline second female plug 333, third pipeline fireproof sheath 334, fourth pipeline 34, fourth pipeline first female plug 341, fourth pipeline connecting pipe 342, fourth pipeline second female plug 343, fourth pipeline fireproof sheath 344, flange 35, flange surface 351, flange faucet 352, flange pipeline male joint 353, flange sealing ring 354, bolt mounting hole 355, bolt 356. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] See also Figure 1 and Figure 2 ,in, Figure 1 A schematic diagram of the overall structure of a battery pack provided in an embodiment of the present application is shown in FIG. Figure 2 for Figure 1 Schematic diagram of the assembly explosion of the power battery cooling system shown in.

[0042] The battery pack 100 provided in the embodiment of the present application includes a plurality of battery cells (not shown in the figure) arranged in sequence in the box frame 20 and a cooling system 10. In a specific implementation, the battery cell can be a square battery cell or a cylindrical battery cell, which is not limited in the embodiment of the present application. For the convenience of description, two directions are defined in the plane where the plurality of battery cells are arranged: a first direction X and a second direction Y, and a direction perpendicular to the plane where the battery cells are arranged is defined as a third direction Z, which is also the vertical direction of the battery pack 100 in the illustrated state.

[0043] Figure 1 The schematic diagram of a battery pack in a state of use is shown, the second cooling subsystem 2 of the cooling system 10 is located at the top, that is, at the side where the battery pack 100 is loaded on the chassis of the vehicle body; the first cooling subsystem 1 is arranged in close contact with the guard plate 30, and the guard plate 30 located at the bottom of the battery pack can provide protection. In this state, the battery cell is in an inverted state.

[0044] In other possible implementations, the second cooling subsystem 2 may also be arranged in close contact with the guard plate 30, and the first cooling subsystem 1 is adjacent to the battery cover. In this state, the battery cell is in an upright state.

[0045] Combination Figure 2 As shown, the cooling system includes a first cooling subsystem 1, a second cooling subsystem 2 and a pipeline group 3. The first cooling subsystem 1 and the second cooling subsystem 2 respectively have a heat exchange width. One of the first cooling subsystem 1 and the second cooling subsystem 2 is arranged at the top of the battery pack 100, and the other is arranged at the bottom of the battery pack 100. The "heat exchange width" here refers to a surface extending along the battery cell arrangement plane for cooling and heat exchange on the battery cell side. The "heat exchange width" includes a case where it is constructed by a continuous heat exchange surface, and also includes a case where it is constructed by a plurality of heat exchange surfaces arranged at intervals. Here, the "top" refers to the side of the battery pack 100 where the battery cell pole is located, and the "bottom" refers to the other side of the battery pack 100 opposite to the battery cell pole. For example, as Figure 2As shown, the first cooling subsystem 1 can be arranged at the top of the battery pack 100, and its heat exchange width includes multiple heat exchange surfaces provided by the organ pipes at intervals, which are used to cool the poles at the top of each battery cell; the second cooling subsystem 2 can be arranged at the bottom of the battery pack 100, and its heat exchange width is a continuous heat exchange surface provided by the temperature equalizing plate, which is used to cool the bottom of each battery cell. It should be understood that in other specific implementations, the first cooling subsystem 1 and the second cooling subsystem 2 can also be arranged in the opposite direction relative to the battery cells, that is, the first cooling subsystem 1 is arranged at the bottom of the battery pack 100, and the second cooling subsystem 2 is arranged at the top of the battery pack 100, and the battery cells on the corresponding sides can also be cooled and dissipated through their respective heat exchange widths. This is not limited to the embodiments of the present application.

[0046] The first cooling subsystem 1 includes a plurality of first branch channels 11, a first liquid inlet interface 12 and a first liquid return interface 13. Figure 3 , this figure is an axial schematic diagram of a first cooling subsystem provided in an embodiment of the present application.

[0047] A plurality of first branch channels 11 are arranged within the heat exchange width range, and a uniformly distributed coolant flow rate can be provided to the top of each battery cell through the plurality of first branch channels 11. In the first direction X, the first liquid inlet interface 12 and the first liquid return interface 13 are located at one end side of the first branch channel 11, wherein the first liquid inlet interface 12 is connected to the inlet of the first branch channel 11, and the first liquid return interface 13 is connected to the outlet of the first branch channel 11.

[0048] The second cooling subsystem 2 includes a plurality of second branch channels 21, a total branch area 22, a total return area 23, a second liquid inlet interface 25, a second liquid return interface 26, a third liquid inlet interface 27 and a third liquid return interface 28. Figure 4 , Figure 5 and Figure 6 ,in, Figure 4 An exploded schematic diagram of the assembly of a second cooling subsystem provided in an embodiment of the present application is shown in FIG. Figure 5 for Figure 4 The front view of the temperature chamber shown in Figure 6 for Figure 4 Front view of the manifold plate shown in FIG.

[0049] Multiple second branch channels 21 are arranged within the heat exchange width range, and multiple second branch channels 21 can provide a coolant flow that tends to be evenly distributed for the bottom of each battery cell. In the first direction X, the total branch area 22 and the total return area 23 are located at one end side of the second branch channel 21, and the total branch area 22 is connected to the inlet of multiple second branch channels 21, so that the low-temperature coolant flowing into the total branch area 22 flows to multiple second branch channels 21; the total return area 23 is connected to the outlet of multiple second branch channels 21, so that the high-temperature coolant that completes the heat exchange with the battery cell side flows back to the total return area 23. The second liquid inlet interface 25 and the third liquid inlet interface 27 are respectively connected to the total branch area 22, and the second liquid return interface 26 and the third liquid return interface 28 are respectively connected to the total return area 23.

[0050] In other possible implementations, the number of the first shunt channel 11 on the first cooling subsystem 1 side and the second shunt channel 21 on the second cooling subsystem 2 side can be determined according to the overall design requirements of the product. For example, a first shunt channel 11 can be provided on the first cooling subsystem 1 side to dissipate heat from the top of each battery cell; a second shunt channel 21 can also be provided on the second cooling subsystem 2 side to dissipate heat from the bottom of each battery cell. This is not limited in the embodiments of the present application.

[0051] The pipeline group 3 includes a first pipeline 31, a second pipeline 32, a third pipeline 33 and a fourth pipeline 34. Figure 2 and Figure 7 ,in, Figure 7 An axonometric diagram of a pipeline group provided in an embodiment of the present application. In the first direction X, the pipeline group 3 is located on the same end side as the first liquid inlet interface 12 and the first liquid return interface 13 of the first cooling subsystem 1, and the second liquid inlet interface 25, the second liquid return interface 26, the third liquid inlet interface 27 and the third liquid return interface 28 of the second cooling subsystem 2.

[0052] One end of the first pipeline 31 is connected to the second liquid inlet interface 25 of the second cooling subsystem 2, and the other end is used to communicate with the coolant output pipeline of the system liquid cooling circuit (not shown in the figure), and the low-temperature coolant provided by the system liquid cooling circuit can be transported to the total distribution area 22 on the second cooling subsystem 2 side via the first pipeline 31 and the second liquid inlet interface 25; one end of the second pipeline 32 is connected to the second liquid return interface 26 of the second cooling subsystem 2, and the other end is used to communicate with the coolant recovery pipeline of the system liquid cooling circuit, and the high-temperature coolant collected in the total return area 23 on the second cooling subsystem 2 side can be transported to the system liquid cooling circuit via the second liquid return interface 26 and the second pipeline 32.

[0053] The third pipeline 33 is connected between the third liquid inlet interface 27 of the second cooling subsystem 2 and the first liquid inlet interface 12 of the first cooling subsystem 1, and is used to transport the low-temperature coolant flowing into the total branch area 22 on the side of the second cooling subsystem 2 to the side of the first cooling subsystem 1; that is, part of the low-temperature coolant flowing into the total branch area 22 flows to the second branch channel 21 of the second cooling subsystem 2, and the other part flows to the first branch channel 11 of the first cooling subsystem 1.

[0054] The fourth pipeline 34 is connected between the first liquid return interface 13 of the first cooling subsystem 1 and the third liquid return interface 28 of the second cooling subsystem 2, and is used to transport the high-temperature coolant that has completed heat exchange to the total return area 23 on the side of the second cooling subsystem 2; that is, it is collected in the total return area 23 with the high-temperature coolant flowing back from the second branch channel 21, and then transported to the system liquid cooling circuit.

[0055] In this way, the two subsystems (the first cooling subsystem 1 and the second cooling subsystem 2) for top cooling and bottom cooling are coupled in series and parallel. Based on the total distribution area 22 configured on the side of the second cooling subsystem 2 (bottom cold plate), uniform distribution of the second branch channels 21 on its own side can be achieved, and uniform distribution to the first branch channels 11 on the side of the first cooling subsystem 1 (top cooling system) can be achieved; at the same time, based on the total return area 23 configured on the side of the second cooling subsystem 2, reflux of the second branch channels 21 on its own side can be achieved, and reflux of the first branch channels 11 on the side of the first cooling subsystem 1 can be achieved. With the help of the pipeline group 3 located on the same end side as the total distribution area 22 and the total return area 23, the flow resistance of the entire power battery cooling system can be effectively reduced, and the two subsystems can obtain a coolant flow that tends to be evenly distributed within the heat exchange width.

[0056] In addition, in the power battery cooling system provided in the embodiment of the present application, in the first direction X, the pipeline group 3 and the interfaces (the first liquid inlet interface 12, the first liquid return interface 13, the second liquid inlet interface 25, the second liquid return interface 26, the third liquid inlet interface 27 and the third liquid return interface 28) on the first cooling subsystem 1 side and the second cooling subsystem 2 side are arranged on the same end side. For example, but not limited to, the pipeline group 3 can be arranged above the total branch area 22 and the total return area 23 of the second cooling subsystem 2, which can effectively improve the integration and further avoid the adverse effects of the complex shunt pipeline on the flow resistance.

[0057] In order to better understand the technical solutions and technical effects of the present application, without losing generality, specific embodiments will be described in detail below in conjunction with the accompanying drawings.

[0058] Combination Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, Figure 8 for Figure 3 AA section view in the figure, Fig. 9 for Figure 3 BB cross-sectional view in. Exemplarily, the first cooling subsystem 1 includes three groups of cold plate assemblies, the second branch channel 21 is formed inside the cold plate assembly, and each cold plate assembly is arranged in sequence in the second direction Y to construct a heat exchange width of the first cooling subsystem 1. In other specific implementations, the number of cold plate assemblies can be selected as needed, such as but not limited to two or other plurality. This embodiment of the application is not limited.

[0059] like Figure 3 As shown, the cold plate assembly is provided with a first liquid inlet interface 12 for the coolant to flow in, and a first liquid return interface 13 for the coolant to flow out, and is connected to the second cooling subsystem 2 side through the corresponding third pipeline 33 and fourth pipeline 34, respectively, which can improve the uniformity of the flow distribution between the cold plate assemblies. Here, the first liquid inlet interface 12 and the first liquid return interface 13 can be male connectors, and are configured as female connectors on the matching third pipeline 33 and fourth pipeline 34 sides, which can be determined according to needs and will not be repeated here.

[0060] In order to further improve the uniformity of the diversion, the cold plate assembly includes a first current collector 111, a second current collector 112, a plurality of diversion harmonica tubes 113 and a plurality of return harmonica tubes 114. The tube bodies of the diversion harmonica tubes 113 and the return harmonica tubes 114 are respectively extended along the first direction X, and the total length can cover all the cells in the battery pack. One end of each harmonica tube is respectively inserted into the first current collector 111, and the other end of each harmonica tube is respectively inserted into the second current collector 112, and each diversion harmonica tube 113 and each return harmonica tube 114 are sequentially spaced in the second direction Y to achieve the diversion of the coolant.

[0061] The first liquid inlet interface 12 and the first liquid return interface 13 of each cold plate assembly are arranged on the first collector 111. The first collector 111 includes a first cavity and a second cavity separated by a first blocking piece 1111, wherein the first liquid inlet interface 12 is connected to the first cavity of the first collector 111, and the diversion harmonica tube 113 is connected to the first cavity, the first liquid return interface 13 is connected to the second cavity of the first collector 111, and the reflux harmonica tube 114 is connected to the second cavity. The low-temperature coolant can enter the first cavity of the first collector 111 through the first liquid inlet interface 12, and flow into the diversion harmonica tube 113 respectively, and after reaching the second collector 112, it flows back to the second cavity of the first collector 111 through each reflux harmonica tube 114, and the high-temperature coolant that completes the heat exchange flows out through the first liquid return interface 13.

[0062] In this embodiment, the first collector 111 includes two first chambers and one second chamber, and two first liquid inlet interfaces 12 are provided, which are respectively provided in one-to-one correspondence with the first chambers. The openings of the two first liquid inlet interfaces 12 face the second cooling subsystem 2 in the third direction Z, and the first liquid return interface 13 faces the outside in the first direction X, which has good assembly processability.

[0063] like Figure 8 As shown, in the second direction Y, the second cavity is located in the middle, the two first cavities are respectively located on both sides of the second cavity, and the two adjacent cavities are separated, and accordingly, the return harmonica pipe 114 connected to the second cavity of the first current collector 111 is located in the middle, and the diversion harmonica pipe 113 connected to the first cavity of the first current collector 111 is respectively located on both sides of the return harmonica pipe 114. On the whole, on the basis of obtaining good diversion uniformity, the flow resistance in the cold plate assembly can be further reasonably controlled.

[0064] In a specific implementation, the second current collector 112 may also include a first cavity and a second cavity separated by a second blocking piece 1121. Fig. 9 As shown, in the second direction Y, a portion of the plurality of diverter harmonica tubes 113 and the plurality of return harmonica tubes 114 are connected to the first cavity of the second current collector 112, and another portion of the plurality of diverter harmonica tubes 113 and the plurality of return harmonica tubes 114 are connected to the second cavity of the second current collector 112. In this way, disturbances that affect the flow of the coolant can be avoided in the second current collector 112.

[0065] In this embodiment, the number of the shunt harmonica pipe 113 and the return harmonica pipe 114 of the cold plate assembly are both set to two. Of course, in other specific implementations, the actual number of the shunt harmonica pipe 113 and the return harmonica pipe 114, for example but not limited to, the number of the shunt harmonica pipe 113 and the return harmonica pipe 114 of the cold plate assembly are both set to one, can be specifically determined according to the overall design requirements of the product. This embodiment of the application is not limited.

[0066] In addition, for the diversion harmonica tube 113 and the return harmonica tube 114, the width of each harmonica tube can be 40 mm to 60 mm, the height can be 3 mm to 5 mm, and the spacing between two adjacent harmonica tubes is between 30 mm and 100 mm to form a reliable smoke exhaust passage.

[0067] In addition, the material of each harmonica pipe can be plastic or aluminum alloy. In a specific implementation, except for the first liquid inlet interface 12 and the two first liquid return interfaces 13, other components can be sprayed with a fireproof insulation coating, which can still maintain insulation performance after high-intensity flame impact, preferably 1000℃ flame impact for 15min, DC 4000V, and leakage current <1mA.

[0068] For example Figure 4, Figure 5 and Figure 6 As shown, the second cooling subsystem 2 includes a flow channel plate 211 and a temperature averaging plate 212. The flow channel plate 211 includes groove portions corresponding to the second branch flow channel 21, the total branch area 22 and the total return area 23, respectively. The temperature averaging plate 212 is overlapped on the surface of the groove portions of the flow channel plate 211, respectively enclosing the second branch flow channel 21, the total branch area 22 and the total return area 23, and the heat exchange width of the second cooling subsystem 2 is formed by the temperature averaging plate 212.

[0069] In this embodiment, the second liquid inlet interface 25, the second liquid return interface 26, the third liquid inlet interface 27 and the third liquid return interface 28 are arranged on the temperature averaging plate 212, and are respectively connected to the total distribution area 22 and the total return area 23 through the through holes on the temperature averaging plate 212. The number of the third liquid inlet interface 27 and the third liquid return interface 28 is the same as that of the cold plate assembly, and they are arranged one by one, such as Figure 4 and Figure 5 As shown, the third liquid inlet interface 27 and the third liquid return interface 28 are respectively provided in three numbers, and can be connected to the corresponding cold plate components through the corresponding third pipeline 33 and the fourth pipeline 34 respectively.

[0070] Similarly, the third liquid inlet interface 27 and the third liquid return interface 28 can be male connectors, and are configured as female connectors on the corresponding third pipeline 33 and fourth pipeline 34 sides, which can be determined specifically as needed. The second liquid inlet interface 25 and the second liquid return interface 26 can also be male connectors, and are configured as female connectors on the corresponding first pipeline 31 and second pipeline 32 sides.

[0071] like Figure 6 As shown, in the first direction X, the total branch area 22 is arranged close to the second branch channel 21, and the total return area 23 is located on the side of the total branch area 22 away from the second branch channel 21, which fully utilizes the available space and has a good integration.

[0072] In order to further improve the uniformity of the flow diversion, the second diversion channel 21 includes multiple sub-channels, and in the second direction Y, the upstream channel section with the inlet is located in the middle area of ​​the heat dissipation width, and the downstream channel section with the outlet is located on both sides of the heat dissipation width. In this way, the low-temperature coolant entering each sub-channel through the inlet first cools and dissipates the battery cells in the middle with relatively poor heat dissipation conditions, and then cools and dissipates the battery cells on the side, which can avoid thermal runaway. On the whole, each battery cell can be brought to a consistent temperature.

[0073] That is, in the second direction Y, the inlet of each sub-channel of the second branch channel 21 is located in the middle, and the outlets of each sub-channel of the second branch channel 21 are located on both sides of the inlet. Based on this, the total return area 23 surrounds the two end sides of the total branch area 22 to communicate with each outlet of the second branch channel 21 respectively.

[0074] In a specific implementation, each sub-channel may be arranged in a circuitous manner, for example but not limited to a 90° bending angle, so that the coolant flowing into each sub-channel of the second branch channel 21 can fully exchange heat with the battery cell side through the temperature balancing plate 212 .

[0075] Furthermore, in order to improve the bearing strength of the second cooling subsystem 2, a reinforcing groove 29 may be provided on the flow channel plate 211. In the second direction Y, the reinforcing grooves 29 are respectively provided on both sides of the second branch flow channel 21. The reinforcing groove 29 may be formed by the same process as the second branch flow channel 21, and is morphologically equivalent to a false flow channel without coolant flowing in. In this way, the bearing strength of the plate body may be effectively enhanced.

[0076] In a specific implementation, the reinforcing groove 29 can also be set at a position in the plate surface where the second branch channel 21 is not set. At the same time, reinforcing ribs 210 can also be set in the grooves of the total branch area 22 and the total return area 23 to further increase the local plate strength on the basis of satisfying the function of interconnecting the liquid paths.

[0077] For example Figure 7 As shown, the number of the third pipeline 33 and the fourth pipeline 34 of the pipeline group 3 is the same as the number of the cold plate components, and they are respectively arranged in a one-to-one correspondence. In this embodiment, three third pipelines 33 and three fourth pipelines 34 are respectively arranged to achieve the connection between the total distribution area 22 and the total return area 23 on the second cooling subsystem 2 side and the cold plate components on the first cooling subsystem 1 side.

[0078] Combination Figure 7 and Fig.10 As shown, Fig.10 An exploded schematic diagram of the assembly of a first pipeline provided in an embodiment of the present application. The first pipeline 31 includes a first female plug 311 of the first pipeline, a first pipeline connecting tube 312 and a first pipeline second female plug 313, and the two ends of the first pipeline connecting tube 312 are respectively connected to the first female plug 311 of the first pipeline and the second female plug 313 of the first pipeline, wherein the opening of the first female plug 311 of the first pipeline can be oriented in the first direction X toward the side opposite to the battery pack, for connection to the system liquid cooling circuit side, and the opening of the first female plug 313 of the first pipeline can be oriented in the third direction Z toward the second cooling subsystem 2, so as to be connected to the second liquid inlet interface 25 on the side of the second cooling subsystem 2.

[0079] In order to facilitate the assembly operation, the first pipeline connecting pipe 312 is a flexible pipe, for example but not limited to, a corrugated pipe or a hose made of elastic material. Further, the first pipeline 31 may also include a first pipeline fireproof sheath 314 wrapped around the outside of the first pipeline connecting pipe 312 to improve the reliability of use. In addition, an NTC may be provided on the first pipeline second female plug 313 to detect the temperature of the coolant in the input pipeline.

[0080] Combination Figure 7 and Fig.11 As shown, Fig.11 An exploded schematic diagram of the assembly of a second pipeline provided in an embodiment of the present application. The second pipeline 32 includes a second pipeline first female plug 321, a second pipeline connecting pipe 322, and a second pipeline second female plug 323, and the two ends of the second pipeline connecting pipe 322 are respectively connected to the second pipeline first female plug 321 and the second pipeline second female plug 323, wherein the opening of the second pipeline first female plug 321 can be oriented in the first direction X toward the side opposite to the battery pack, for connection to the system liquid cooling circuit side, and the opening of the second pipeline second female plug 323 can be oriented in the third direction Z toward the second cooling subsystem 2, so as to be connected to the second liquid return interface 26 on the second cooling subsystem 2 side.

[0081] In order to facilitate the assembly operation, the second pipeline connecting pipe 322 is a flexible pipe, for example but not limited to, a corrugated pipe or a hose made of elastic material. Further, the second pipeline 32 may also include a second pipeline fireproof sheath 324 wrapped around the second pipeline connecting pipe 322 to improve the reliability of use. In addition, an NTC may be provided on the second pipeline second female plug 323 to detect the temperature of the coolant in the output pipeline.

[0082] In a specific implementation, the first pipeline 31 and the second pipeline 32 can be connected to the system liquid cooling circuit side through the flange 35. Figure 7 and Fig.12 ,in, Fig.12 An axonometric view of a flange provided in an embodiment of the present application. The flange 35 includes a flange surface 351, a flange faucet 352 and a flange pipeline male connector 353. In the first direction X, the flange faucet 352 and the flange pipeline male connector 353 are respectively located on both sides of the flange surface 351, wherein the flange faucet 352 is used to connect with the coolant inlet and outlet pipelines of the system liquid cooling circuit of the whole vehicle, and the first pipeline first female plug 311 of the first pipeline 31 and the second pipeline first female plug 321 of the second pipeline 32 are respectively connected to the corresponding flange pipeline male connector 353.

[0083] The flange surface 351 is provided with a groove structure for installing the flange seal ring 354, and the flange surface 351 is also provided with a bolt installation hole 355; please refer to Fig.13 , the figure is Fig.12 Schematic diagram of the assembly relationship between the flange and the battery pack is shown in FIG. After the assembly is completed, most of the flange faucet 352 is located outside the battery pack, used to match the water inlet and outlet pipes of the whole vehicle, and the rest is located inside the battery pack. The flange surface 351 is tightly attached to the inner wall of the battery pack box frame, and is compressed and sealed by the flange seal ring 354, and is locked with the battery pack box frame 20 by the bolts 356 inserted in the bolt mounting holes 355.

[0084] In a specific implementation, the first female plug 311 of the first pipeline can be directly connected to the system liquid cooling circuit. This embodiment of the application is not limited.

[0085] Combination Figure 7 and Fig.14 As shown, Fig.11 An exploded schematic diagram of the assembly of a third pipeline provided in an embodiment of the present application. The third pipeline 33 includes two third pipeline first female plugs 331, two third pipeline connecting pipes 332 and a third pipeline second female plug 333; the third pipeline second female plug 333 is a three-way structure, and its two side interfaces are respectively connected to the corresponding third pipeline first female plug 331 through a third pipeline connecting pipe 332, wherein the third pipeline second female plug 333 faces the second cooling subsystem 2 in the third direction Z so as to be connected to the third liquid inlet interface 27 on the side of the second cooling subsystem 2, and the two third pipeline first female plugs 331 face the first cooling subsystem 1 in the third direction Z so as to be respectively connected to the two first liquid inlet interfaces 12 of the corresponding cold plate assembly.

[0086] In order to facilitate the assembly operation, the third pipeline connecting pipe 332 is a flexible pipe, for example but not limited to, a corrugated pipe or a hose made of elastic material. Further, the third pipeline 33 may also include two third pipeline fireproof sheaths 334, which are respectively wrapped around the outside of the third pipeline connecting pipe 332 to improve the reliability of use.

[0087] Combination Figure 7 and Fig.15 As shown, Fig.15 An exploded schematic diagram of the assembly of a fourth pipeline provided in an embodiment of the present application. The fourth pipeline 34 includes a fourth pipeline first female plug 341, a fourth pipeline connecting pipe 342 and a fourth pipeline second female plug 343, and both ends of the fourth pipeline connecting pipe 342 are respectively connected to the fourth pipeline first female plug 341 and the fourth pipeline second female plug 343, wherein the opening of the fourth pipeline first female plug 341 can be oriented toward the battery pack in the first direction X so as to be connected to the first liquid return interface 13 of the corresponding cold plate assembly, and the opening of the fourth pipeline second female plug 343 can be oriented toward the second cooling subsystem 2 in the third direction Z so as to be connected to the third liquid return interface 28 on the side of the second cooling subsystem 2.

[0088] In order to facilitate the assembly operation, the fourth pipeline connecting pipe 342 is a flexible pipe, for example but not limited to, a corrugated pipe or a hose made of elastic material. Further, the fourth pipeline 34 may also include a fourth pipeline fireproof sheath 344 wrapped around the fourth pipeline connecting pipe 342 to improve the reliability of use.

[0089] Specifically, the circulation path of the coolant in the power battery cooling system is as follows:

[0090] In the first step, the coolant enters the first pipeline 31 through the flange; in the second step, the coolant flows into the total branch area 22 through the first pipeline 31 and the second liquid inlet interface 25 on the side of the second cooling subsystem 2; in the third step, the coolant passes through the total branch area 22, wherein the first part of the coolant circulates in the second cooling subsystem 2 (bottom cooling system) through the second branch channel 21, wherein the second part flows into the third pipeline 33 through the third liquid inlet interface 27; in the fourth step, after the first part of the coolant circulates in the second cooling subsystem 2, it flows to the total return area 23 of the second cooling subsystem 2; the second part of the coolant flows to the first cooling subsystem 1 (top cooling system) through the third pipeline 33 and the first liquid inlet interface 12. system); in the fifth step, the second part of the cooling liquid is split into two parts again, and is split to the two diversion harmonica tubes 113 through the two first liquid inlet interfaces 12 of the first collector 111. The two parts of the cooling liquid flowing into the two diversion harmonica tubes 113 flow to the first collector 111 through the second collector 112 and the return harmonica tube 114, and flow to the fourth pipeline 34 through the first return liquid interface 13; in the sixth step, the cooling liquid in the fourth pipeline 34 flows to the total return area 23 through the third return liquid interface 28 on the side of the second cooling subsystem 2, and merges with the first part of the cooling liquid; in the seventh step, the merged cooling liquid is reserved for the cooling system through another flange via the second return liquid interface 26 and the second pipeline 32.

[0091] In addition to the aforementioned implementation scheme of the power battery cooling system, the embodiment of the present application further provides a vehicle, which includes a battery pack 100, and the battery pack 100 adopts the aforementioned power battery cooling system 10. Based on the power battery cooling system, on the one hand, it is possible to effectively improve the uniformity of the bottom and top liquid cooling flow distribution, avoid the adverse effects of the complex shunt pipeline on the flow resistance, and at the same time improve the integration.

[0092] It should be understood that other functional components of the vehicle can be implemented using existing technologies, so they will not be described in detail.

[0093] In addition, the ordinal numbers "first" and "second" used in this article are only used to describe the same functional composition or structure in the technical solution. It is understood that the use of the above ordinal numbers does not constitute an understanding of the technical solution for protection of this application.

[0094] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power battery cooling system, characterized in that: It includes a first cooling subsystem, a second cooling subsystem and a pipeline group; the first cooling subsystem and the second cooling subsystem respectively have a heat exchange width, one of the first cooling subsystem and the second cooling subsystem is arranged on the top of the battery pack, and the other is arranged on the bottom of the battery pack; The first cooling subsystem includes a first flow branch channel, a first liquid inlet interface and a first liquid return interface; the first liquid inlet interface is communicated with the inlet of the first flow branch channel, and the first liquid return interface is communicated with the outlet of the first flow branch channel; The second cooling subsystem includes a second branch channel, a total branch area, a total return area, a second liquid inlet interface, a second liquid return interface, a third liquid inlet interface and a third liquid return interface; the total branch area is connected to the inlet of the second branch channel, and the total return area is connected to the outlet of the second branch channel; the second liquid inlet interface and the third liquid inlet interface are respectively connected to the total branch area, and the second liquid return interface and the third liquid return interface are respectively connected to the total return area; The third liquid inlet interface and the first liquid inlet interface, as well as the first liquid return interface and the third liquid return interface are communicated through the pipeline group respectively.

2. The power battery cooling system according to claim 1, characterized in that: The pipeline group is located on the same end side as the first liquid inlet interface and the first liquid return interface of the first cooling subsystem, and the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface of the second cooling subsystem.

3. The power battery cooling system according to claim 1 or 2, characterized in that: The first cooling subsystem includes a plurality of cold plate assemblies, the second flow channel is formed inside each of the cold plate assemblies, and the first liquid inlet interface and the first liquid return interface are provided on the cold plate assemblies; the cold plate assemblies are arranged in sequence along the second direction.

4. The power battery cooling system according to claim 3, characterized in that: The cold plate assembly includes a first current collector, a second current collector, a shunt harmonica tube and a reflux harmonica tube, one end of the shunt harmonica tube and the reflux harmonica tube are inserted into the first current collector, and the other end is inserted into the second current collector; the tube bodies of the shunt harmonica tube and the reflux harmonica tube are respectively extended along the first direction, and are arranged in sequence and spaced apart in the second direction; the first liquid inlet interface and the first liquid return interface are arranged on the first current collector.

5. The power battery cooling system according to claim 4, characterized in that: The first current collector comprises a first cavity and a second cavity which are separated from each other, the first liquid inlet interface and the diversion harmonica tube are in communication with the first cavity of the first current collector, and the first liquid return interface and the return harmonica tube are in communication with the second cavity of the first current collector.

6. The power battery cooling system according to claim 5, characterized in that: The number of the first cavities of the first current collector is two, and the first cavities are respectively arranged on two sides of the second cavity of the first current collector.

7. The power battery cooling system according to claim 5 or 6, characterized in that: The second current collector includes a first cavity and a second cavity which are separated from each other, and there are multiple diversion harmonica tubes and multiple return harmonica tubes. In the second direction, a part of the multiple diversion harmonica tubes and the multiple return harmonica tubes are connected to the first cavity of the second current collector, and the other part is connected to the second cavity of the second current collector.

8. The power battery cooling system according to claim 1, characterized in that: The second cooling subsystem includes a flow channel plate and a temperature averaging plate, the flow channel plate includes groove portions respectively opened corresponding to the second branch flow channel, the total branch area and the total return area, the temperature averaging plate is overlapped on the surface of the flow channel plate where the groove portions are opened, enclosing the second branch flow channel, the total branch area and the total return area; the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface are arranged on the temperature averaging plate, and the temperature averaging plate constructs the heat exchange width of the second cooling subsystem.

9. The power battery cooling system according to claim 8, characterized in that: The number of the third liquid inlet interfaces and the third liquid return interfaces is the same as the number of the cold plate components of the first cooling subsystem.

10. The power battery cooling system according to claim 8, characterized in that: In the first direction, the total-dividing region is arranged close to the second branching channel, and the total-return region is located on a side of the total-dividing region away from the second branching channel.

11. The power battery cooling system according to any one of claims 8 to 10, characterized in that: The second branch channel includes multiple sub-channels. In the second direction, the upstream channel section with an inlet of each sub-channel is located in the middle area of ​​the heat dissipation width of the second cooling subsystem, and the downstream channel section with an outlet of each sub-channel is located on both side areas of the heat dissipation width of the second cooling subsystem.

12. The power battery cooling system according to claim 11, characterized in that: In the second direction Y, the inlets of each sub-channel of the second branch channel are located in the middle, and the outlets of each sub-channel of the second branch channel are respectively located on both sides of the inlet; the total return area surrounds the two end sides of the total branch area in the second direction.

13. The power battery cooling system according to claim 1, characterized in that: The pipeline group includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, one end of the first pipeline is connected to the second liquid inlet interface, and the other end is used to communicate with the output pipeline of the system liquid cooling circuit; One end of the second pipeline is connected to the second liquid return interface, and the other end is used to connect to the recovery pipeline of the system liquid cooling circuit; the third pipeline is connected between the third liquid inlet interface and the first liquid inlet interface, and the fourth pipeline is connected between the first liquid return interface and the third liquid return interface.

14. The power battery cooling system according to claim 13, characterized in that: In the first direction X, the pipeline group and the first liquid inlet interface and the first liquid return interface of the first cooling subsystem, and the second liquid inlet interface, the second liquid return interface, the third liquid inlet interface and the third liquid return interface of the second cooling subsystem are located on the same end side.

15. A battery pack, characterized in that: The battery pack includes a plurality of battery cells arranged in sequence and a cooling system, and the cooling system adopts the power battery cooling system according to any one of claims 1 to 14.

16. A vehicle, characterized in that: The vehicle includes a battery pack, and the battery pack is the battery pack according to claim 15.

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