Battery cell thermal management system, battery pack, and transportation vehicle

Abstract

The application relates to the technical field of batteries, aims to solve the technical problem that the whole battery pack is heated during the process of discharging cell eruption from the inside of the battery pack, and provides a cell thermal management system, a battery pack and a traffic carrier. The cell thermal management system comprises a first cold plate, a second cold plate and a guard plate. The first cold plate, the second cold plate and the guard plate are sequentially and spacedly arranged. The space between the first cold plate and the second cold plate is used for at least partially accommodating the cell. The second cold plate and the guard plate are provided with a smoke exhaust channel. The second cold plate is provided with an air inlet hole. The air inlet hole is connected with the smoke exhaust channel and the space between the first cold plate and the second cold plate. The application can cool and lower the temperature of the cell and the cell eruption when the cell is overheated, and the cell eruption is discharged from the smoke exhaust channel between the second cold plate and the guard plate, so that the risk of failure of the thermal management system of the battery pack is reduced, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a cell thermal management system, a battery pack, and a vehicle. Background Technology

[0002] With the development of fast charging and discharging technology for battery packs, the performance requirements for the battery pack's thermal management system have also increased. During fast charging, the battery cells heat up significantly. To prevent overheating and potential explosions, cell explosion-proof valves are installed. When a cell overheats, the valve opens to expel the hot ejected material. However, the process of the explosion-proof valve expelling the ejected material also causes the entire battery pack to continue heating up, potentially leading to the failure of the battery pack's thermal management system and compromising battery pack safety. Utility Model Content

[0003] In view of this, this application provides a cell thermal management system, a battery pack, and a vehicle to solve the technical problem that the entire battery pack heats up during the discharge of cell ejection material from inside the battery pack, thereby causing the thermal management system of the battery pack to fail.

[0004] One embodiment of this application provides a battery cell thermal management system. The battery cell thermal management system includes a first cold plate, a second cold plate, and a protective plate. The first cold plate, the second cold plate, and the protective plate are arranged sequentially at intervals. The space between the first cold plate and the second cold plate is at least partially used to accommodate the battery cell. A smoke exhaust channel is provided between the second cold plate and the protective plate. The second cold plate has an air inlet. The air inlet connects the smoke exhaust channel to the space between the first cold plate and the second cold plate.

[0005] The first and second cold plates can cool the battery cell disposed between them. High-temperature ejected material from the battery cell exits through an air inlet and enters the exhaust channel located between the second cold plate and the protective plate. As the ejected material flows within the exhaust channel, the second cold plate cools it. The battery cell thermal management system of this application can cool the battery cell and its ejected material when the cell overheats, and allow the ejected material to exit through the exhaust channel between the second cold plate and the protective plate, thereby reducing the risk of thermal management system failure in the battery pack and improving battery pack safety.

[0006] In some embodiments, both the first cold plate and the second cold plate are provided with flow channels. Each flow channel includes at least one inlet branch and multiple branch units. One end of the inlet branch is configured to allow refrigerant to enter the flow channel, and the other end of the inlet branch is connected to a branch unit. Multiple branch units are arranged in parallel.

[0007] Both the first and second cold plates are equipped with flow channels, and the branch units of the flow channels are connected in parallel. Compared with the series connection, the parallel connection can reduce the total flow resistance of the refrigerant in the flow channel, improve the cooling efficiency, and reduce the phenomenon of excessive temperature difference between the first and second cold plates in different areas.

[0008] In some embodiments, the flow path of the branch unit extends along a first direction. Multiple branch units are spaced apart along a second direction. The first and second directions intersect. There are multiple air inlets. These multiple air inlets are spaced apart along the first and second directions. Along the second direction, a branch unit is provided between two adjacent air inlets.

[0009] The flow paths on the first and second cold plates are the same, so the first and second cold plates can be processed with the same set of molds to form a first cold plate / second cold plate with flow channels. Then, holes are opened at preset positions on the second cold plate to form air inlets, which can reduce manufacturing costs.

[0010] In some embodiments, the cell thermal management system further includes a plurality of cells. The plurality of cells are disposed between a first cold plate and a second cold plate. Each cell includes a cell housing, a first terminal, a second terminal, and a cell explosion-proof valve. The first and second terminals are disposed on one side of the cell housing along a third direction and facing the first cold plate. The cell explosion-proof valve is disposed on the other side of the cell housing along the third direction and facing the second cold plate. The third direction is perpendicular to the first and second directions. Along the second direction, two adjacent branch units of the first cold plate are configured to cool the first and second terminals, respectively. Each air inlet is disposed opposite to at least one cell explosion-proof valve.

[0011] The first and second terminals of the battery cell are located on the same side and face the first cold plate. The battery cell explosion-proof valve is located on the side facing the second cold plate. In the second cold plate, the air inlet and branch units are spaced apart along a second direction. The flow paths on the first and second cold plates are the same. In this way, two adjacent branch units of the flow path on the first cold plate can cool the first and second terminals of the battery cell. Correspondingly, on the second cold plate, the air inlet and the battery cell explosion-proof valve are positioned opposite each other between two corresponding branch units along a third direction. The battery cell thermal management system in this embodiment can effectively cool and exhaust smoke from the battery cell of the thermoelectric separation battery.

[0012] In some embodiments, the first and second poles are in thermal contact via a branch unit of a thermally conductive material and a first cold plate. The circumferential region of the cell explosion-proof valve is in thermal contact via a branch unit of a thermally conductive material and a second cold plate.

[0013] In some embodiments, the flow path further includes an inlet and an outlet. The inlet is configured to allow refrigerant to flow into the flow path. An inlet branch connects the inlet and a branch unit. The outlet is configured to allow refrigerant to flow out of the flow path. Multiple branch units converge at the outlet.

[0014] In some embodiments, the first cold plate has a first side. The second cold plate has a second side. The inlet and outlet of the first cold plate are located on the first side. The inlet and outlet of the second cold plate are located on the second side. The first side and the second side are arranged facing each other.

[0015] The inlet and outlet of the first cold plate are located on its first side, and the inlet and outlet of the second cold plate are located on its second side. The first side and the second side are arranged facing each other. In this way, the relevant structures for introducing and discharging refrigerant into the first cold plate and the second cold plate can be arranged in a third direction between the first cold plate and the second cold plate, so as to avoid increasing the size of the cell thermal management system in the third direction due to the relevant structures for introducing and discharging refrigerant.

[0016] In some embodiments, the battery cell thermal management system further includes a housing. A first cold plate and a second cold plate are respectively connected to opposite sides of the housing. The housing has a battery cell compartment and an electrical compartment. The battery cell compartment is used to house the battery cells. Both the first and second cold plates have flow channels. Along the direction from the first cold plate to the second cold plate, at least a portion of the projection of the flow channel lies within the projection of the battery cell compartment, and at least a portion of the projection of the flow channel lies within the projection of the electrical compartment.

[0017] In this way, the first and second cold plates can cool the battery cells located in the cell compartment, and can also cool the structure located in the electrical compartment, which helps to further improve the safety of the battery pack where the cell thermal management system is located.

[0018] One embodiment of this application provides a battery pack. The battery pack includes a cell thermal management system as described in any of the above embodiments.

[0019] One embodiment of this application provides a transportation vehicle. The transportation vehicle includes a mounting frame and a battery pack as described in any of the above embodiments. The battery pack is mounted on the mounting frame. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0021] Figure 1 A cross-sectional view of a battery cell thermal management system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the first cold plate provided in an embodiment of this application; Figure 3This is a structural schematic diagram of the first cold plate from another angle, provided in an embodiment of this application. Figure 4 This is a schematic diagram of the structure of the second cold plate provided in an embodiment of this application; Figure 5 This is a structural schematic diagram of the second cold plate from another angle, provided in one embodiment of this application; Figure 6 This is a schematic diagram of the flow channel provided in one embodiment of this application; Figure 7 This is a schematic diagram of the flow channel provided in another embodiment of this application; Figure 8 This is a schematic diagram of the flow channel provided in another embodiment of this application; Figure 9 This is a schematic diagram of the flow channel provided in another embodiment of this application; Figure 10 An exploded view of a battery cell thermal management system provided in an embodiment of this application; Figure 11 This is a schematic diagram of the battery pack architecture provided in one embodiment of this application; Figure 12 This is a schematic diagram of the structure of a transportation vehicle provided in one embodiment of this application.

[0022] Explanation of key component symbols: 100. Cell thermal management system; 10. Exhaust duct; 11. First cold plate; 12. Second cold plate; 121. Air inlet; 1000. Flow channel; 1001. Inlet; 1002. Outlet; 1003. Inlet branch; 1004. Branch unit; 1004a. Sub-path; 1a. First side; 1b. Second side; 1c. Third side; 1d. Fourth side; 1e. First connecting side; 1f. Second connecting side; 101. First sub-plate ; 1011, First part; 1012, Second part; 102, Second sub-board; 2, Protective plate; 3, Battery cell; 31, Battery cell housing; 32, First terminal post; 33, Second terminal post; 34, Battery cell explosion-proof valve; 4, Housing; 401, Battery cell compartment; 402, Electrical compartment; 5, Liquid inlet assembly; 6, Liquid outlet assembly; 7, Cover plate; 200, Battery pack; 300, Vehicle; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Embodiments of this application provide a battery cell thermal management system. The battery cell thermal management system includes a first cold plate, a second cold plate, and a protective plate. The first cold plate, the second cold plate, and the protective plate are arranged sequentially at intervals. The space between the first cold plate and the second cold plate is at least partially used to accommodate the battery cell. A smoke exhaust channel is provided between the second cold plate and the protective plate. The second cold plate has an air inlet. The air inlet connects the smoke exhaust channel to the space between the first cold plate and the second cold plate.

[0025] The first and second cold plates can cool the battery cell disposed between them. High-temperature ejected material from the battery cell exits through an air inlet and enters the exhaust channel located between the second cold plate and the protective plate. As the ejected material flows within the exhaust channel, the second cold plate cools it. The battery cell thermal management system of this application can cool the battery cell and its ejected material when the cell overheats, and allow the ejected material to exit through the exhaust channel between the second cold plate and the protective plate, thereby reducing the risk of thermal management system failure in the battery pack and improving battery pack safety.

[0026] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Please see Figure 1 One embodiment of this application provides a battery cell thermal management system 100. The battery cell thermal management system 100 includes a first cold plate 11, a second cold plate 12, and a protective plate 2. The first cold plate 11, the second cold plate 12, and the protective plate 2 are arranged sequentially at intervals. The space between the first cold plate 11 and the second cold plate 12 is at least partially used to accommodate the battery cell. A smoke exhaust channel 10 is provided between the second cold plate 12 and the protective plate 2. The second cold plate 12 is provided with an air inlet 121. The air inlet 121 connects the smoke exhaust channel 10 with the space between the first cold plate 11 and the second cold plate 12.

[0028] The first cold plate 11 and the second cold plate 12 can cool the battery cell disposed between the first cold plate 11 and the second cold plate 12. High-temperature battery cell ejection material exiting the battery cell enters the exhaust channel 10 located between the second cold plate 12 and the protective plate 2 through the air inlet 121. As the battery cell ejection material flows within the exhaust channel 10, the second cold plate 12 can cool it down. The battery cell thermal management system 100 of this application can cool the battery cell and its ejection material when the battery cell is overheated, and allow the ejection material to be discharged through the exhaust channel 10 between the second cold plate 12 and the protective plate 2, thereby reducing the risk of failure of the battery pack's thermal management system and improving the safety of the battery pack.

[0029] Please see Figures 2 to 5In some embodiments, both the first cold plate 11 and the second cold plate 12 are provided with flow channels 1000. The flow channel 1000 includes at least one inlet branch 1003 and multiple branch units 1004. One end of the inlet branch 1003 is configured to allow refrigerant to enter the flow channel 1000, and the other end of the inlet branch 1003 is connected to a branch unit 1004. The multiple branch units 1004 are arranged in parallel.

[0030] Both the first cold plate 11 and the second cold plate 12 are provided with flow channels 1000, and the branch units 1004 of the flow channels 1000 are connected in parallel. Compared with the series connection, the parallel connection can reduce the total flow resistance of the refrigerant in the flow channels 1000, improve the cooling efficiency, and reduce the phenomenon of excessive temperature difference between the first cold plate 11 and the second cold plate 12 in different areas.

[0031] In some embodiments, the flow path of the branch unit 1004 extends along a first direction X. Multiple branch units 1004 are spaced apart along a second direction Y. The first direction X and the second direction Y intersect. There are multiple air inlets 121. The multiple air inlets 121 are spaced apart along the first direction X and the second direction Y. Along the second direction Y, a branch unit 1004 is provided between two adjacent air inlets 121.

[0032] The flow channels 1000 on the first cold plate 11 and the second cold plate 12 have the same path setting. Therefore, the first cold plate 11 and the second cold plate 12 can be processed with the same set of molds to form the first cold plate 11 and the second cold plate 12 with flow channels 1000. Then, an air inlet 121 is formed by opening a hole at a preset position on the second cold plate 12, which can reduce manufacturing costs.

[0033] It is understood that the flow path of branch unit 1004 extending along the first direction X means that the overall flow path of branch unit 1004 tends to extend along the first direction X. In some embodiments, branch unit 1004 includes a plurality of sub-paths 1004a, which are connected in series. Sub-paths 1004a may extend along the first direction X or along the second direction Y. Figure 3 and Figure 5 In the embodiment shown, the extension direction of sub-path 1004a is the first direction X.

[0034] Since the flow paths of the flow channel 1000 of the first cold plate 11 and the flow channel 1000 of the second cold plate 12 are the same, please refer to... Figure 5 Take the second cold plate 12 as an example. Figure 5In the illustrated embodiment, the flow channel 1000 includes two inlet branches 1003 and three branch units 1004. Along the second direction Y, the second cold plate 12 is provided with four rows of air inlets 121, and a branch unit 1004 is provided between two adjacent air inlets 121. Each branch unit 1004 includes three sub-channels 1004a.

[0035] In some embodiments, the battery cell thermal management system 100 further includes a plurality of battery cells 3. The plurality of battery cells 3 are disposed between a first cold plate 11 and a second cold plate 12. Each battery cell 3 includes a battery cell housing 31, a first terminal 32, a second terminal 33, and a battery cell explosion-proof valve 34. The first terminal 32 and the second terminal 33 are disposed on one side of the battery cell housing 31 along a third direction Z and face the first cold plate 11. The battery cell explosion-proof valve 34 is disposed on the other side of the battery cell housing 31 along the third direction Z and face the second cold plate 12. The third direction Z is perpendicular to the first direction X and the second direction Y. Along the second direction Y, two adjacent branch units 1004 of the first cold plate 11 are configured to cool the first terminal 32 and the second terminal 33, respectively. Each air inlet 121 is disposed opposite to at least one battery cell explosion-proof valve 34.

[0036] In a thermoelectric separator battery, the cell refers to a cell in which the terminals and the cell explosion-proof valve are physically separated and respectively disposed on two end faces of the cell. In the embodiments of this application, the first terminal 32 and the second terminal 33 of the cell 3 are disposed on the same side and facing the first cold plate 11, and the cell explosion-proof valve 34 is disposed on the side facing the second cold plate 12. In the second cold plate 12, the air inlet 121 and the branch unit 1004 are spaced apart along the second direction Y; the path of the flow channel 1000 on the first cold plate 11 and the second cold plate 12 is the same. In this way, two adjacent branch units 1004 of the flow channel 1000 of the first cold plate 11 can cool the first terminal 32 and the second terminal 33 of the battery cell 3. Correspondingly, on the second cold plate 12, the air inlet 121 and the battery cell explosion-proof valve 34 are arranged opposite to each other between the two branch units 1004 along the third direction Z. The battery cell thermal management system 100 in this embodiment can effectively cool and exhaust the battery cells of the thermoelectric separation battery.

[0037] In some embodiments, the first electrode 32 and the second electrode 33 are in thermal contact with the branch unit 1004 of the first cold plate 11 through a thermally conductive material. The circumferential region of the cell explosion-proof valve 34 is in thermal contact with the branch unit 1004 of the second cold plate 12 through a thermally conductive material. The thermally conductive material can be a thermally conductive structural adhesive, a thermally conductive pad, or a phase change material, etc.

[0038] In some embodiments, the flow channel 1000 further includes an inlet 1001 and an outlet 1002. The inlet 1001 is configured to allow refrigerant to flow into the flow channel 1000. An inlet branch 1003 connects the inlet 1001 and a branch unit 1004. The outlet 1002 is configured to allow refrigerant to flow out of the flow channel 1000. Multiple branch units 1004 converge at the outlet 1002.

[0039] In some embodiments, the first cold plate 11 has a first side 1a. The second cold plate 12 has a second side 1b. The inlet 1001 and outlet 1002 of the first cold plate 11 are located on the first side 1a. The inlet 1001 and outlet 1002 of the second cold plate 12 are located on the second side 1b. The first side 1a and the second side 1b are arranged facing each other.

[0040] The inlet 1001 and outlet 1002 of the first cold plate 11 are located on its first side 1a, and the inlet 1001 and outlet 1002 of the second cold plate 12 are located on its second side 1b. The first side 1a and the second side 1b are arranged facing each other. In this way, the relevant structures for introducing and discharging refrigerant into the first cold plate 11 and the second cold plate 12 can be arranged between the first cold plate 11 and the second cold plate 12 along the third direction Z, so as to avoid increasing the size of the cell thermal management system 100 in the third direction Z due to the relevant structures for introducing and discharging refrigerant.

[0041] In some embodiments, the first cold plate 11 further includes a third side 1c, which is disposed opposite to the first side 1a, and the flow channel 1000 of the first cold plate 11 is disposed between the first side 1a and the third side 1c. The second cold plate 12 further includes a fourth side 1d, which is disposed opposite to the second side 1b, and the flow channel 1000 of the second cold plate 12 is disposed between the second side 1b and the fourth side 1d.

[0042] The flow channel 1000 is positioned between the opposite sides of the first cold plate 11 and the second cold plate 12. Compared to external pipes on the surfaces of the first and second cold plates 11 and 12, external pipes would make the surfaces of the first and second cold plates 11 and 12 uneven. By embedding the flow channel 1000 inside the plates of the first and second cold plates 11 and 12, the first and second cold plates 11 and 12 can be easily assembled and connected with other structures of the battery cell thermal management system 100, thereby optimizing the utilization of internal space. In the embodiments of this application, when processing the flow channel 1000, the first and second cold plates 11 and 12 are processed from a single sheet of plate with a certain thickness, so that the flow channel 1000 is embedded inside the plate. This can be achieved using die casting. The flow channel 1000 of the first and second cold plates 11 and 12 can have the same orientation, and the same set of molds can be used to process the flow channel 1000. Then, air inlets 121 are processed at predetermined positions on the second cold plate 12, so that the second cold plate 12 has both cooling and smoke exhaust functions.

[0043] In some embodiments, the first cold plate 11 and the second cold plate 12 each include a first sub-plate 101 and a second sub-plate 102 stacked together. At least a portion of the flow channel 1000 is disposed on the first sub-plate 101 or the second sub-plate 102.

[0044] The flow channel 1000 is defined by the stacked first sub-plate 101 and second sub-plate 102, allowing the refrigerant to flow inside the first cold plate 11 and second cold plate 12. This enables simultaneous cooling of the first sub-plate 101 and second sub-plate 102, improving cooling efficiency. During manufacturing, a portion of the cavity wall of the flow channel 1000 can be pre-machined on the first sub-plate 101 and second sub-plate 102, or the cavity wall of the flow channel 1000 can be pre-machined only on the first sub-plate 101 or the second sub-plate 102. The first sub-plate 101 and second sub-plate 102 are then stacked along the thickness direction to form the flow channel 1000 that accommodates the refrigerant, facilitating the processing of the built-in flow channel 1000.

[0045] Please see Figures 6 to 9 In some embodiments, in the first cold plate 11, the second sub-plate 102 is closer to the protective plate 2 than the first sub-plate 101. In the second cold plate 12, the second sub-plate 102 is farther away from the protective plate 2 than the first sub-plate 101. The side of the second sub-plate 102 facing away from the first sub-plate 101 is a plane.

[0046] The space between the second sub-plate 102 of the first cold plate 11 and the second sub-plate 102 of the second cold plate 12 is at least partially used to accommodate the battery cell 3. The side of the second sub-plate 102 facing away from the first sub-plate 101 is flat, that is, the side of the second sub-plate 102 close to the battery cell 3 remains flat, which allows for better placement of the battery cell 3 between the second sub-plate 102 of the first cold plate 11 and the second sub-plate 102 of the second cold plate 12. At the same time, the flatness of the side of the second sub-plate 102 facing away from the first sub-plate 101 prevents the volume of the battery cell thermal management system 100 from being increased due to the setting of the flow channel 1000, which is beneficial to maintaining or even increasing the energy density of the battery pack.

[0047] The first sub-board 101 and the second sub-board 102 are attached and connected. The connection between the first sub-board 101 and the second sub-board 102 can be welding, such as brazing or laser welding.

[0048] In this design, the side of the first sub-board 101 closest to the second sub-board 102 is the first connection side 1e. The other side of the second sub-board 102 closest to the first sub-board 101 is the second connection side 1f. Please refer to [link / reference]. Figure 6In some embodiments, a portion of the cavity wall of the flow channel 1000 can be machined simultaneously on the first connecting side 1e and the second connecting side 1f. This is generally a recessed structure; the recessed structure on the first sub-plate 101 is the first portion 1011, and the other flat portions of the first sub-plate 101 are the second portion 1012. The opposite sides of the first cold plate 11 or the second cold plate 12 remain flat. For example... Figure 7 As shown, the second connecting side 1f of the second sub-plate 102 may not require pre-processing of the recessed structure, meaning that both sides of the second sub-plate 102 are flat in the thickness direction. The processing method of the flow channel 1000 can be stamping, etching, die casting, etc. Understandably, along the thickness direction of the second cold plate 12, the projection of the air inlet 121 is located within the projection of the second part 1012.

[0049] Please see Figure 8 and Figure 9 In some embodiments, the first sub-plate 101 includes a first portion 1011 and a second portion 1012 connected together. Along the thickness direction of the first sub-plate 101, the first portion 1011 protrudes from the second portion 1012 in a direction away from the second sub-plate 102, and the projection of the flow channel 1000 is distributed in the first portion 1011.

[0050] Compared to the recessed flow channel 1000 machined on the side where the first sub-plate 101 and the second sub-plate 102 are in contact, the first part 1011 protrudes from the second part 1012 along the thickness direction of the first sub-plate 101. The space requirement of the flow channel 1000 is met by the protruding first part 1011, and the area of ​​the second part 1012 can be made thinner, which can save materials and reduce the weight of the first sub-plate 101. Figure 8 and Figure 9 In the process, the flow channel 1000 on the first sub-plate 101 can be formed by stamping on the sheet material, which is simpler.

[0051] Please see Figure 10 In some embodiments, the battery cell thermal management system 100 further includes a housing 4. A first cold plate 11 and a second cold plate 12 are respectively connected to opposite sides of the housing 4. The housing 4 has a battery cell compartment 401 and an electrical compartment 402. The battery cell compartment 401 is used to accommodate battery cells 3. Both the first cold plate 11 and the second cold plate 12 are provided with flow channels 1000. Along the direction from the first cold plate 11 to the second cold plate 12, at least a portion of the projection of the flow channel 1000 is located within the projection of the battery cell compartment 401, and at least a portion of the projection of the flow channel 1000 is located within the projection of the electrical compartment 402.

[0052] In this way, the first cold plate 11 and the second cold plate 12 can cool the battery cells set in the cell compartment 401, and can also cool down the structure located in the electrical compartment 402, which helps to further improve the safety of the battery pack where the cell thermal management system 100 is located.

[0053] Please continue reading Figure 10 In some embodiments, the cell thermal management system 100 further includes a cover plate 7 connected to the side of the first cold plate 11 away from the second cold plate 12.

[0054] In some embodiments, taking the refrigerant as the coolant, the cell thermal management system 100 further includes an inlet assembly 5 and an outlet assembly 6. Both the first cold plate 11 and the second cold plate 12 are provided with flow channels 1000. The inlet assembly 5 is connected to the inlet 1001 of the first cold plate 11 and the inlet 1001 of the second cold plate 12. The outlet assembly 6 is connected to the outlet 1002 of the first cold plate 11 and the outlet 1002 of the second cold plate 12.

[0055] After the coolant enters the flow channel 1000 through the inlet 1001, it can be effectively distributed to each branch unit 1004, which helps the coolant to flow quickly to the areas that need heat dissipation, thereby improving cooling efficiency. Simultaneously, the coolant is supplied to the first cold plate 11 and the second cold plate 12 through the inlet assembly 5, and the return coolant from the outlet 1002 of the flow channel 1000 is collected through the outlet assembly 6. Since the first cold plate 11 and the second cold plate 12 share the inlet assembly 5 and the outlet assembly 6, the piping connection structure is simplified, reducing the space occupied by piping connections within the battery cell thermal management system 100. Figure 3 and Figure 5 In the embodiment, there are two entering branches 1003 and three branch units 1004. The three branch units 1004 are connected in parallel and converge at the outlet 1002.

[0056] Please see Figure 11 One embodiment of this application provides a battery pack 200. The battery pack 200 includes the cell thermal management system 100 as described in any of the above embodiments. Since the battery pack 200 includes all embodiments of all technical solutions of the above-described cell thermal management system 100, it has at least all the beneficial effects brought by all the above embodiments, which will not be described in detail here.

[0057] Please see Figure 12 One embodiment of this application provides a transportation vehicle 300. The transportation vehicle 300 includes a mounting frame (not shown) and a battery pack 200 as described in any of the above embodiments. The battery pack 200 is mounted on the mounting frame. Since the transportation vehicle 300 includes all embodiments of the above-described battery pack 200 or all technical solutions of the battery pack 200, it possesses at least all the beneficial effects brought by all the above embodiments, which will not be elaborated further here.

[0058] In some embodiments, the vehicle 300 may be, but is not limited to, an electric vehicle, a pure electric vehicle, a hybrid electric vehicle, a range-extended vehicle, a ship, a flying car, etc.

[0059] Terminology Explanation The terms “first” and “second” are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0060] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component present. When a component is considered to be "located" on another component, it can be directly located on the other component or there may be an intervening component present.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell thermal management system, characterized in that, include: A first cold plate, a second cold plate, and a protective plate are arranged sequentially at intervals. The space between the first cold plate and the second cold plate is at least partially used to accommodate the battery cell. A smoke exhaust channel is provided between the second cold plate and the protective plate. The second cold plate is provided with an air inlet, which connects the smoke exhaust channel with the space between the first cold plate and the second cold plate.

2. The cell thermal management system according to claim 1, characterized in that, Both the first cold plate and the second cold plate are provided with flow channels; the flow channels include at least one inlet branch and multiple branch units, one end of the inlet branch is configured to allow refrigerant to enter the flow channel, the other end of the inlet branch is connected to one of the branch units, and the multiple branch units are arranged in parallel.

3. The cell thermal management system according to claim 2, characterized in that, The flow path of the branch unit extends along a first direction, and multiple branch units are spaced apart along a second direction; the first direction and the second direction intersect. The number of air inlets is multiple, and the multiple air inlets are spaced apart along the first direction and the second direction; along the second direction, a branch unit is provided between two adjacent air inlets.

4. The cell thermal management system according to claim 3, characterized in that, The battery cell thermal management system further includes a plurality of battery cells, which are disposed between the first cold plate and the second cold plate; The battery cell includes a battery cell housing, a first terminal, a second terminal, and a battery cell explosion-proof valve. The first terminal and the second terminal are disposed on one side of the battery cell housing along a third direction and facing the first cold plate. The battery cell explosion-proof valve is disposed on the other side of the battery cell housing along the third direction and facing the second cold plate. The third direction is perpendicular to the first direction and the second direction. Along the second direction, two adjacent branch units of the first cold plate are configured to cool the first pole and the second pole, respectively; each air inlet is disposed opposite to at least one of the cell explosion-proof valves.

5. The cell thermal management system according to claim 4, characterized in that, The first electrode and the second electrode are in thermal contact with the branch unit of the first cold plate through a thermally conductive material, and the circumferential area of ​​the cell explosion-proof valve is in thermal contact with the branch unit of the second cold plate through a thermally conductive material.

6. The cell thermal management system according to claim 2, characterized in that, The flow channel also includes an inlet and an outlet. The inlet is configured to allow refrigerant to flow into the flow channel, and the inlet branch connects the inlet and one of the branch units. The outlet is configured to allow refrigerant to flow out of the flow channel, and multiple branch units converge at the outlet.

7. The cell thermal management system according to claim 6, characterized in that, The first cold plate has a first side, and the second cold plate has a second side; the inlet and the outlet of the first cold plate are located on the first side, and the inlet and the outlet of the second cold plate are located on the second side; The first side and the second side are arranged facing each other.

8. The cell thermal management system according to claim 1, characterized in that, The battery cell thermal management system also includes a housing, with the first cold plate and the second cold plate respectively connected to opposite sides of the housing; the housing is provided with a battery cell compartment and an electrical compartment, the battery cell compartment being used to house the battery cells; Both the first cold plate and the second cold plate are provided with flow channels. Along the direction from the first cold plate to the second cold plate, at least a portion of the projection of the flow channels is located within the projection of the cell compartment, and at least a portion of the projection of the flow channels is located within the projection of the electrical compartment.

9. A battery pack, characterized in that, Includes the cell thermal management system as described in any one of claims 1 to 8.

10. A transportation vehicle, characterized in that, It includes a mounting bracket and a battery pack as described in claim 9, wherein the battery pack is mounted on the mounting bracket.

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