Cooling system, battery pack and vehicle

Abstract

The utility model relates to a cooling system, a battery pack and a vehicle, and the cooling system comprises a first cooling part, a second cooling part and a circulation part; the first cooling part comprises two current collectors and a plurality of harmonica-shaped tubes, the harmonica-shaped tubes are arranged between the two current collectors at intervals in the first direction, and the side wall faces, facing the second cooling part, of the harmonica-shaped tubes form a busbar contact face. The second cooling part comprises a plurality of side cooling plates which are arranged at intervals in the second direction, cooling cavities are formed in the side cooling plates, a battery cell mounting cavity is defined between every two adjacent side cooling plates, and the first direction is perpendicular to the second direction; the circulation part comprises a cooling liquid pipeline, and the cooling liquid pipeline communicates with the first cooling part and the second cooling part. According to the cooling system, the battery cell can be quickly and effectively cooled, the situation that the quick charging performance is influenced due to the fact that the temperature of the battery cell is too high is avoided, it is guaranteed that the battery pack has the good quick charging performance so as to improve the user experience, and meanwhile the safety of the battery pack in the quick charging process can be guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery pack cooling, in particular to a cooling system, a battery pack and a vehicle. BACKGROUND

[0002] The speed of charging of a battery pack of a vehicle has always been concerned by customers, and the fast charging of the battery pack is a difficult problem to be solved in a long time in the future of power batteries, but in the process of the fast charging of the battery pack, the temperature of the battery cell will be sharply increased, and the speed of the fast charging and safety are limited by the maximum temperature of the battery cell, therefore, in order to ensure safety and avoid the temperature of the battery cell being too high, the charging speed of the battery pack is limited, resulting in poor user experience.

[0003] Therefore, how to ensure that the battery pack has good fast charging performance to improve user experience, and also ensure the safety of the battery pack in the process of the fast charging of the battery pack, is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The application aims to provide a cooling system, a battery pack and a vehicle, which can quickly and effectively cool the battery cell, avoid the influence of the high temperature of the battery cell on the fast charging performance, ensure that the battery pack has good fast charging performance to improve user experience, and also ensure the safety of the battery pack in the process of the fast charging of the battery pack.

[0005] To solve the above technical problem, the application provides a cooling system, which comprises a first cooling part, a second cooling part and a flow part; the first cooling part comprises two current collectors and a plurality of accordion tubes, each of the accordion tubes is arranged between the two current collectors in a first direction, the two ends of the accordion tube are respectively communicated with the two current collectors, and a side wall surface of the accordion tube facing the second cooling part forms a busbar contact surface; the second cooling part comprises a plurality of side cooling plates arranged in a second direction, the side cooling plate is provided with a cooling cavity, and an electric cell mounting cavity is formed between adjacent two side cooling plates, and the first direction is perpendicular to the second direction; and the flow part comprises a cooling liquid pipeline, and the cooling liquid pipeline is respectively communicated with the first cooling part and the second cooling part.

[0006] Optionally, the second cooling part further comprises a plurality of communication pipes; the two ends of the side cooling plate are respectively provided with a communication port communicated with the cooling cavity, and the communication ports of adjacent two side cooling plates are communicated through the communication pipe.

[0007] Optionally, the communication port is provided with an interface pipe, and the communication pipe is in interference fit with the interface pipe.

[0008] Optionally, the inner diameter of the interface pipe is 10-30 mm.

[0009] Optionally, the cooling liquid pipeline is communicated with at least two cooling liquid branches, and the cooling liquid pipeline is communicated with the current collector and the cooling cavity of each side cooling plate through the corresponding cooling liquid branch.

[0010] Optionally, the busbar contact surface is further provided with a heat-conducting medium layer, and the thickness of the heat-conducting medium layer is 0.2mm-1.5mm.

[0011] Optionally, the thickness of the first cooling part is 2mm-6.5mm.

[0012] Optionally, the thickness of the side cooling plate is 4.2mm-7.8mm.

[0013] Optionally, the liquid cooling plate is further provided, the liquid cooling plate is internally provided with a cooling flow channel, the liquid cooling plate is located at the side of the second cooling part away from the first cooling part, and the side surface of the liquid cooling plate facing the second cooling part forms a cell contact surface.

[0014] Optionally, the cooling liquid pipeline is communicated with the cooling flow channel through the cooling liquid branch.

[0015] The application further provides a battery pack comprising cells and the cooling system as described above, the cell mounting cavity of the cooling system is internally mounted with the cells; the pole columns of each cell are electrically connected through the busbar, and the busbar contact surface of the harmonica tube is attached to the busbar.

[0016] Optionally, the shell is further provided, the cells and the cooling system are located in the shell, and the side wall of the shell is provided with a first perforation and a second perforation, the liquid inlet pipeline of the flow-through part passes through the first perforation, and the liquid outlet pipeline of the flow-through part passes through the second perforation.

[0017] Optionally, the projection area of the side cooling plate on the large face of the cell accounts for 3%-98% of the area of the large face.

[0018] The application further provides a vehicle comprising the battery pack as described above.

[0019] Compared with the prior art, the cooling system, the battery pack and the vehicle provided by the application have the following technical effects:

[0020] In the mounted state, the busbar contact surface of the harmonica tube can be attached to the busbar, the temperature of the pole column and the busbar rapidly rises when the cell is charging, the cooling liquid flowing through the harmonica tube can exchange heat with the busbar, and then exchange heat with the pole column, so that the temperature of the busbar between the cells, the pole column of the cell and the bare cell near the pole column in the charging process can be rapidly reduced, the temperature of these components in the charging process is controllable, the temperature of the cell is prevented from being too high, and the charging safety is ensured.

[0021] The electric core installed in the electric core installation cavity can be attached to the side wall of the electric core installation cavity, that is, the large face of the electric core is attached to the side cooling plate, the electric core is a cuboid structure, two opposite side faces with large area of the electric core form a large face respectively, a side cooling plate is arranged between the large faces of two adjacent electric cores, the large face is attached to the side cooling plate, the cooling liquid flowing through the cooling cavity of the side cooling plate exchanges heat with the large face and carries away the heat of the electric core, since the area of the large face is relatively large, the attachment of the large face to the side cooling plate can realize rapid cooling of the electric core and ensure that the battery system maintains a high charging rate.

[0022] The pole of the electric core can be cooled by the first cooling part, and the large face of the electric core can be cooled by the second cooling part, so as to ensure the cooling effect of the electric core and avoid the case that the temperature of the electric core is too high during rapid charging, thereby ensuring safety. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an exploded view of the battery pack provided by the embodiments of the present application;

[0024] Figure 2 is a structural schematic view of the battery pack after removing the upper cover;

[0025] Figure 3 is a structural schematic view of the cooling system and the electric core in the installed state;

[0026] Figure 4 is a structural schematic view of the second cooling part and the electric core in the installed state;

[0027] Figure 5 is a partial structural schematic view of the cooling system.

[0028] ATTACHMENT Figures 1-5 In the drawings, the reference signs are explained as follows:

[0029] 1 first cooling part, 11 first current collector, 111 blocking piece, 12 second current collector, 13 mouth organ pipe;

[0030] 2 second cooling part, 21 side cooling plate, 22 electric core installation cavity, 23 interface pipe, 24 communication pipe;

[0031] 31 liquid inlet pipeline, 32 liquid outlet pipeline, 33 first branch, 34 second branch, 35 third branch, 36 fourth branch, 37 fifth branch, 38 sixth branch;

[0032] 4 liquid cooling plate, 41 electric core contact surface, 42 cooling liquid inlet, 43 cooling liquid outlet;

[0033] 5 heat-conducting medium layer;

[0034] 6 electric core;

[0035] 71 upper cover, 72 bottom case, 73 first through hole, 74 second through hole;

[0036] 8 busbar;

[0037] 9 cross beam. DETAILED DESCRIPTION

[0038] In order to make the skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0039] The speed of charging the battery pack of the vehicle has always been concerned by the customers, and the fast charging of the battery pack is a difficult problem to be solved for a long time in the future of the power battery. However, in the process of fast charging of the battery pack, the temperature of the battery cell will rise sharply, and the speed of charging and safety are limited by the maximum temperature of the battery cell. Therefore, in order to ensure safety and avoid high temperature of the battery cell, the charging speed of the battery pack is limited, resulting in poor user experience.

[0040] To solve the above problems, the cooling system, the battery pack and the vehicle are provided in the embodiments of the present application, wherein the vehicle includes a battery pack, as shown in Figure 1 and Figure 2 The battery pack includes a shell, a cooling system and battery cells 6 arranged in the shell. The battery cells 6 are electrically connected by busbars 8. The cooling system is used to cool the battery cells 6, so that the battery pack can be quickly cooled by the cooling system during fast charging, ensuring that the fast charging performance is realized to improve user experience, and the safety during fast charging is also ensured.

[0041] Specifically, as shown in Figure 3 The cooling system includes a first cooling part 1, a second cooling part 2 and a flow-through part. The first cooling part 1 is used to cool the busbar 8 connected between the battery cells 6. The second cooling part 2 can cool the large surface of the battery cell 6 between the adjacent two battery cells 6.

[0042] As shown in Figure 2 and Figure 3 The first cooling part 1 includes two current collectors. A plurality of accordion tubes 13 are arranged between the two current collectors along a first direction. The two ends of the accordion tube 13 are respectively communicated with the two current collectors. The side wall surface of the accordion tube 13 facing the second cooling part 2 forms a busbar contact surface. The accordion tubes 13 are arranged side by side in sequence. The two ends of each accordion tube 13 are respectively communicated with the two current collectors. The second cooling part 2 includes a plurality of side cooling plates 21 arranged along a second direction. The side cooling plates 21 are arranged along the first direction. The side cooling plates 21 are provided with cooling cavities. The battery cell installation cavities 22 are formed between the adjacent two side cooling plates 21. The battery cell installation cavities 22 are used to install the battery cells 6. The first direction and the second direction are as shown in Figure 3 andFigure 4 As shown by the arrows in the diagram, the first and second directions are perpendicular.

[0043] The cooling system also includes a circulation section, which is connected to the first cooling section 1 and the second cooling section 2 respectively. The circulation section includes a cooling circuit and is provided with a coolant pipeline. The coolant circuit is connected to the first cooling section 1 and the second cooling section 2 respectively through the coolant pipeline, so that the collector of the first cooling section 1, the harmonica tube 13 and the cooling chambers of the side cold plates 21 of the second cooling section 2 are respectively connected to the cooling circuit. The circulation section provides coolant and provides circulation power for the coolant, ensuring the overall cooling effect of the cooling system.

[0044] In the installed state, the busbar contact surface of the harmonica tube 13 can contact and fit with the busbar 8. When the battery cell 6 is charging, the temperature of the terminal and the busbar 8 rises rapidly. The coolant flowing inside the harmonica tube 13 can exchange heat with the busbar 8, and then with the terminal. This can quickly reduce the temperature of the busbar 8 between the battery cells 6, the terminal of the battery cell 6, and the bare battery cells near the terminal during the charging process, ensuring that the temperature of these components is controllable during the charging process, avoiding the battery cell 6 from overheating, and thus ensuring charging safety.

[0045] like Figure 4 As shown, the battery cell 6 is installed in the battery cell mounting cavity 22. The large surface of the battery cell 6 can fit against the side wall of the battery cell mounting cavity 22, that is, the large surface of the battery cell 6 fits against the side cooling plate 21. The battery cell 6 has a cuboid structure. The two opposite sides of the battery cell 6 with larger areas form a large surface. A side cooling plate 21 is sandwiched between two adjacent large surfaces of the battery cell 6. The coolant flowing through the cooling cavity in the side cooling plate 21 will exchange heat with the large surface and carry away the heat of the battery cell 6. Since the area of ​​the large surface is relatively large, the battery cell 6 can be cooled quickly by the side cooling plate 21 fitting against the large surface, ensuring that the battery system maintains a high charging rate.

[0046] In this embodiment, the projected area of ​​the side cooling plate 21 on the large surface of the battery cell 6 accounts for 3%-98% of the area of ​​the large surface. That is to say, the contact area between the large surface of the battery cell 6 and the side cooling plate 21 accounts for 3%-98% of the area of ​​the large surface of the battery cell 6. Of course, this percentage can also be 1%, 2%, 2.5% or 99%, etc. Setting this percentage to 3%-98%, such as 3%, 25%, 50%, 70%, 90%, 98%, etc., can reduce the process requirements while ensuring effective cooling of the large surface of the battery cell 6.

[0047] The cooling system provided in this embodiment can cool the terminals of the battery cell 6 through the first cooling section 1, and cool the large surface of the battery cell 6 through the second cooling section 2, so as to ensure the cooling effect of the battery cell 6 and avoid the battery cell 6 from getting too hot during fast charging, thereby ensuring safety.

[0048] like Figure 2 As shown, a heat-conducting medium layer 5 is also provided on the surface of the busbar contact surface of the first cooling section 1. In the installed state, the heat-conducting medium layer 5 is sandwiched between the busbar contact surface and the busbar 8, which plays the role of heat conduction and can balance the tolerance, ensuring that each busbar contact surface can contact the corresponding busbar 8 at the same time, thereby ensuring that the cooling medium in the harmonica tube 13 can exchange heat with the busbar 8.

[0049] Specifically, there are no restrictions on the specific material and structure of the thermal conductive medium layer 5. The thermal conductive medium layer 5 can be a flexible thermal conductive pad sandwiched between the busbar contact surface and the busbar 8, or it can be a thermal conductive adhesive layer coated between the busbar contact surface and the busbar 8.

[0050] The thickness of the thermal conductive medium layer 5 is preferably 0.2mm-1.5mm. Of course, the thickness of the thermal conductive medium layer 5 can also be selected as 0.1mm, 0.15mm, 1.6mm, 1.8mm, 2mm, etc. Setting the thickness of the thermal conductive medium layer 5 to 0.2mm-1.5mm, specifically 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, etc., can ensure good thermal conductivity while avoiding the situation of occupying too much space due to excessive thickness.

[0051] The thickness of the first cooling section 1 is 2mm-6.5mm. Of course, in this embodiment, the thickness of the first cooling section 1 can also be set to 1mm, 1.5mm, 7mm, 8mm, etc. Setting the thickness of the first cooling section 1 to 2mm-6.5mm, such as 2mm, 3mm, 4mm, 5mm, 6mm, 6.5mm, can ensure that there is a sufficient amount of coolant to meet the cooling requirements without affecting the overall height of the battery pack.

[0052] The circulation section includes two coolant lines: an inlet line 31 and an outlet line 32. Each coolant line is connected to at least two coolant branches. The coolant lines are connected to the collector and the cooling chambers of each side cold plate 21 through their respective coolant branches. In other words, the cooling system is provided with only one inlet line 31 and one outlet line 32 to meet the coolant circulation requirements of the first cooling section 1 and the second cooling section 2, thus simplifying the overall structure of the circulation section.

[0053] To be detailed, such as Figure 1 and Figure 3As shown, the two current collectors of the first cooling part 1 are respectively a first current collector 11 and a second current collector 12, the cooling liquid branch in communication with the liquid inlet pipeline 31 includes a first branch 33 and a second branch 34, the liquid inlet pipeline 31 is in communication with the first current collector 11 through the first branch 33 and the communication pipe 24, and the liquid inlet pipeline 31 is in communication with each cooling cavity through the second branch 34. The cooling liquid branch in communication with the liquid outlet pipeline 32 includes a third branch 35 and a fourth branch 36, the liquid outlet pipeline 32 is in communication with the first current collector 11 through the third branch 35, and the liquid outlet pipeline 32 is in communication with each cooling cavity through the fourth branch 36. Among them, the first branch 33 and the third branch 35 are respectively in communication with both ends of the first current collector 11, and the third branch 35 and the fourth branch 36 are respectively in communication with both ends of the cooling cavity of the side cooling plate 21.

[0054] In this way, the liquid inlet pipeline 31 and the liquid outlet pipeline 32 are arranged on the same side of the cooling system, that is, the side facing the first current collector 11. In order to ensure that the cooling liquid can pass through each mouthpiece pipe 13 to cool the busbar 8, a blocking piece 111 is further arranged in the first current collector 11. The blocking piece 111 can block the flow of cooling liquid in the flow passage of the first current collector 11, so that the communication position of part of the mouthpiece pipes 13 with the first current collector 11 is located on the side of the blocking piece 111 facing the first branch 33. The flow direction of the cooling liquid in this part of the mouthpiece pipes 13 is from the first current collector 11 to the second current collector 12. The communication position of the remaining part of the mouthpiece pipes 13 with the first current collector 11 is located on the side of the blocking piece 111 facing the second branch 34. The flow direction of the cooling liquid in this part of the mouthpiece pipes 13 is from the second current collector 12 to the first current collector 11. For reference Figure 3 The flow direction of the cooling liquid is indicated by the arrows of the middle mouthpiece pipe 13.

[0055] In this embodiment, the specific structure of the blocking piece 111 is not limited. The blocking piece 111 can be an integral structure with the first current collector 11, or the end of a certain mouthpiece pipe 13 located at the middle position can be inserted into the first current collector 11 and welded and fixed with the current collector. The part of the mouthpiece pipe 13 inserted into the first current collector 11 can form the above-mentioned blocking piece 111.

[0056] Alternatively, in this embodiment, the liquid inlet pipeline 31 is in communication with the first current collector 11 through the first branch 33, and the liquid outlet pipeline 32 is in communication with the second current collector 12 through the third branch 35. The cooling liquid entering the first current collector 11 can reach the second current collector 12 after flowing through each mouthpiece pipe 13 and flow from the second current collector 12 to the liquid outlet pipeline 32 and be discharged. At this time, the liquid inlet pipeline 31 and the liquid outlet pipeline 32 are respectively located on both sides of the cooling system, and the flow directions of the cooling liquid in each mouthpiece pipe 13 are the same, that is, from the first current collector 11 to the second current collector 12.

[0057] The two ends of the side cold plate 21 along the first direction are respectively formed with an inlet end and an outlet end, and the inlet end and the outlet end are respectively provided with a connecting port in communication with the cooling cavity. Specifically, the connecting ports of the inlet ends of the two adjacent side cold plates 21 are communicated through a communication pipe 24, and the connecting ports of the outlet ends of the two adjacent side cold plates 21 are communicated through a communication pipe 24. The second branch 34 is in communication with the connecting port of the inlet end of the adjacent side cold plate 21, and is in communication with the connecting ports of the inlet ends of the other side cold plates 21 through the communication pipe 24. The fourth branch 36 is in communication with the connecting port of the outlet end of the adjacent side cold plate 21, and is in communication with the connecting ports of the outlet ends of the other side cold plates 21 through the communication pipe 24. That is, the side cold plates 21 are arranged in parallel through the plurality of communication pipes 24.

[0058] Specifically, the connecting port is provided with an interface pipe 23, which can be integrally formed with the side cold plate 21 to simplify the manufacturing process. Of course, welding or other connection methods can also be used. The communication pipe 24 and the interface pipe 23 are sleeved and sealed and fixed through a press-fit interference fit. The side cold plate 21 and the interface pipe 23 can be made of a metal plate to ensure the cooling effect. The communication pipe 24 can be made of a plastic pipe, which can be easily press-fit through the press-fit interference fit of the plastic pipe and the metal interface pipe 23. The second branch 34 and the fourth branch 36 of the flow-through part can be directly communicated with the connecting pipe of the nearest side cold plate 21, which is relatively easy to operate.

[0059] The inner diameter of the interface pipe 23 is preferably 10mm-30mm. Of course, the inner diameter of the interface pipe 23 can be set to 5mm, 8mm, 9mm or 32mm, 35mm, etc. Setting the inner diameter of the interface pipe 23 to 10mm-30mm, such as 10mm, 15mm, 20mm, 25mm, 30mm, etc., can ensure a large flow of cooling liquid, thereby ensuring the cooling effect of the second cooling part 2 on the large face of the battery cell 6, while also avoiding the situation that the interface pipe 23 has a large volume and weight due to a large inner diameter.

[0060] In this embodiment, the thickness of the side cold plate 21 is preferably 4.2mm-7.8mm. Of course, the thickness of the side cold plate 21 can also be set to 3.5mm, 3.8mm, 4mm or 8mm, 8.5mm, 9mm, etc. Setting the thickness of the side cold plate 21 to 4.2mm-7.8mm, such as 4.2mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.8mm, etc., can ensure effective cooling of the large face of the battery cell 6 while avoiding the situation that the side cold plate 21 occupies too much space due to a large thickness.

[0061] In this embodiment, the structures of all side cold plates 21 can be the same, that is, the liquid inlet end and the liquid outlet end of the side cold plate 21 are respectively provided with two connecting ports, the connecting ports of the two side cold plates 21 located at the edges can be used for communication with the corresponding second branch 34 or fourth branch 36, and the unconnected connecting ports can be plugged by a plugging piece. Alternatively, the structures of the side cold plates 21 located at the middle position are consistent, the liquid inlet end and the liquid outlet end are respectively provided with two connecting ports, and the two side cold plates 21 located at the edges can be set according to the actual communication condition of the second branch 34 or the fourth branch 36.

[0062] As shown in Figure 1 , Figure 3 and Figure 5 , the cooling system further comprises a liquid cooling plate 4 provided with a cooling flow channel, the liquid cooling plate 4 is located on the side of the second cooling part 2 away from the first cooling part 1, and the side surface of the liquid cooling plate 4 facing the second cooling part 2 forms an electrode core contact surface 41 for abutting with the side end surface of the electrode core 6 away from the pole. Figure 1 In this embodiment, the arrangement of the cooling flow channel in the liquid cooling plate 4 is not limited, as shown in , the liquid cooling plate 4 is provided with one cooling liquid inlet 42 and one cooling liquid outlet 43, and the cooling flow channel communicated between the cooling liquid inlet 42 and the cooling liquid outlet 43 can be arranged in a serpentine shape.

[0063] As shown in Figure 1 and Figure 3 , the cooling liquid branch communicated with the liquid inlet pipeline 31 further comprises a fifth branch 37, and the cooling liquid branch communicated with the liquid outlet pipeline 32 further comprises a sixth branch 38, wherein the liquid inlet pipeline 31 is communicated with the cooling liquid inlet 42 of the liquid cooling plate 4 through the fifth branch 37, and the liquid outlet pipeline 32 is communicated with the cooling liquid outlet 43 of the liquid cooling plate 4 through the sixth branch 38, so as to simplify the overall liquid inlet and liquid outlet pipeline arrangement of the cooling system.

[0064] In the cooling system provided in this embodiment, the first cooling part 1 cools the electrode core 6 from the pole through the busbar 8, the second cooling part 2 cools the electrode core 6 from the large surface, and the liquid cooling plate 4 cools the electrode core 6 from the side surface away from the pole. In this way, the cooling effect of the cooling system on the electrode core 6 can be further guaranteed, and the rapid charging of the electrode core 6 is further ensured.

[0065] The battery pack comprises an upper cover 71 and a bottom shell 72, the bottom shell 72 is provided with a receiving groove, and the bottom shell 72 has a box structure similar to an open top. The upper cover 71 covers the top of the bottom shell 72 and seals the open structure. The upper cover 71 and the bottom shell 72 are circumferentially sealed and fixed, and a receiving cavity is formed therebetween. The above cooling system and the electrode core 6 are installed in the receiving cavity.

[0066] In this embodiment, the placement of the battery cells 6 in the battery pack is not limited, and the pole of the battery cell 6 can be upward or downward (i.e., the battery cell 6 is inverted). Taking the case where the pole of the battery cell 6 is upward as an example, as shown in Figure 1 As described above, the liquid cooling plate 4 is arranged at the bottom of the accommodating groove of the bottom shell 72, the first cooling part 1 is arranged at the lower surface of the upper shell, and the side cooling plates 21 are arranged in the accommodating groove in the second direction in sequence and in parallel. During installation, a row of battery cells 6 is arranged in parallel in the first direction in each battery cell mounting cavity 22.

[0067] The bottom of the battery cell 6 and the liquid cooling plate 4 are fixed by the heat-conducting glue, and heat conduction is achieved through the heat-conducting glue, which ensures the cooling effect of the liquid cooling plate 4 on the battery cell 6 and ensures the stable installation of the battery cell 6.

[0068] As shown in Figure 1 and Figure 2 The side wall of the bottom shell 72 is also provided with a first through hole 73 and a second through hole 74. The liquid inlet pipeline 31 of the flow-through part passes through the first through hole 73 and communicates with the cooling device outside the battery pack. The liquid outlet pipeline 32 of the flow-through part passes through the second through hole 74 and communicates with the cooling device outside the battery pack. The cooling device can cool the cooling liquid flowing in the cooling circuit, and at the same time, the cooling device can also provide flow power for the cooling liquid in the cooling circuit, so as to ensure the cooling effect of the cooling system on the battery cell 6.

[0069] In addition, the battery pack also includes a cross beam 9 arranged in the mounting cavity of the shell. The cross beam 9 and the bottom shell 72 can be fixed by welding or the like. The cross beam 9 can be used to limit the installation of each battery cell 6, reduce the probability of swelling of the battery cell 6 during use, and prolong the service life of the battery pack. The cross beam 9 is also provided with a notch or a matching groove. The poles of each battery cell 6 are connected in series through the busbar 8 and connected with the copper bar through the busbar 8. The connection between the copper bar and the busbar 8 can be located at the position of the cross beam 9, and an insulating member is arranged between the connection and the cross beam 9. The insulating member can be fixed with the cross beam 9, which can be an insulating pad or an insulating coating.

[0070] In the description of the present application, it should be understood that the terms "thickness", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0072] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A cooling system, characterized by, The cooling system comprises a first cooling part, a second cooling part and a flow passage part. The first cooling part comprises two current collectors and a plurality of accordion tubes, each of the accordion tubes is arranged between the two current collectors along a first direction, two ends of each of the accordion tubes are communicated with the two current collectors respectively, and a busbar contact surface is formed on a side wall of the accordion tube facing the second cooling part. The second cooling part comprises a plurality of side cooling plates arranged along a second direction, each of the side cooling plates is provided with a cooling cavity, and an electrode cell mounting cavity is formed between adjacent two side cooling plates. The flow passage part comprises a cooling liquid pipeline, and the cooling liquid pipeline is communicated with the first cooling part and the second cooling part respectively.

2. The cooling system of claim 1, wherein, The second cooling part further comprises a plurality of communication pipes. Two ends of each of the side cooling plates are provided with a communication port communicated with the cooling cavity, and the communication ports of adjacent two side cooling plates are communicated through the communication pipe.

3. The cooling system of claim 2, wherein, The communication port is provided with an interface pipe, and the communication pipe is in interference fit with the interface pipe.

4. The cooling system of claim 3, wherein, An inner diameter of the interface pipe is 10mm-30mm.

5. Cooling system according to any of claims 1-4, characterized in that The cooling liquid pipeline is communicated with at least two cooling liquid branches, and the cooling liquid pipeline is communicated with the current collectors and the cooling cavities of the side cooling plates through the corresponding cooling liquid branches respectively.

6. Cooling system according to any of claims 1-4, characterized in that The busbar contact surface is further provided with a heat conduction medium layer, and a thickness of the heat conduction medium layer is 0.2mm-1.5mm. And / or, a thickness of the first cooling part is 2mm-6.5mm. And / or, a thickness of the side cooling plate is 4.2mm-7.8mm.

7. Cooling system according to any of claims 1-5, characterized in that The cooling system further comprises a liquid cooling plate, the liquid cooling plate is provided with a cooling flow channel, the liquid cooling plate is located on a side of the second cooling part away from the first cooling part, and an electrode cell contact surface is formed on a side surface of the liquid cooling plate facing the second cooling part.

8. The cooling system of claim 7, wherein, The cooling liquid pipeline is communicated with the cooling flow channel through a cooling liquid branch.

9. A battery pack, characterized by, The cooling system comprises an electrode cell and the cooling system according to any one of claims 1-8, and the electrode cell is mounted in the electrode cell mounting cavity of the cooling system. Pole columns of each of the electrode cells are electrically connected through a busbar, and the busbar contact surface of the accordion tube is attached to the busbar.

10. The battery pack of claim 9, wherein, The cooling system further comprises a shell, the electrode cell and the cooling system are located in the shell, a side wall of the shell is provided with a first through hole and a second through hole, an inlet pipeline of the flow passage part passes through the first through hole, and an outlet pipeline of the flow passage part passes through the second through hole.

11. The battery pack of claim 9 or 10, wherein, A projection area of the side cooling plate on a large surface of the electrode cell accounts for 3%-98% of an area of the large surface.

12. A vehicle characterized by comprising: The battery pack comprises the battery pack according to any one of claims 9-11.

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