Battery pack and electric vehicle

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery pack and an electric vehicle, and the battery pack comprises a box body, a battery module, a cooling plate and a battery pack circuit breaking unit, wherein the battery module is arranged in the box body; the cooling plate is arranged on the top surface of the battery module; the cooling plate is provided with a cooling area with a cooling liquid flow channel; the battery pack circuit breaking unit is arranged on the top surface of the cooling plate; the cooling area covers the top surface of the battery module and the bottom surface of the battery pack circuit breaking unit. According to the battery pack with the structure, the cooling plate is arranged on the top surface of the battery module, and the battery module at the lower part and the battery pack circuit breaking unit at the upper part are simultaneously cooled through the cooling plate, so that compared with a mode that cooling plates are respectively arranged at the bottoms of the battery module and the battery pack circuit breaking unit, the occupied space of the cooling structure can be reduced; pipeline arrangement of a liquid inlet pipe and a liquid outlet pipe of cooling liquid is reduced, so that the structure of the battery pack is simplified, and meanwhile, the manufacturing cost of the battery pack can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack and an electric vehicle. Background Art

[0002] Products that use 400V high-voltage systems and 2.2C fast charging in the prior art can no longer meet the needs of electric vehicles to further improve charging efficiency. In order to further improve charging efficiency, products that use 800V high-voltage systems and 4C fast charging solutions are used in the prior art. Under this fast charging solution, the charging current is large. When charging at a high current, the heat generated by the battery pack disconnect unit (BDU) is extremely high, and the BDU needs to be cooled. The BDU of the existing battery pack is arranged at the top of the battery module, and the cooling plate is arranged at the bottom of the battery module. The cooling plate cools and dissipates the heat of the battery module at the bottom. There is no cooling structure at the BDU, so it is necessary to add a cooling structure for the BDU separately. The cooling structure of the BDU and the cooling plate of the battery module are respectively arranged at different positions of the battery module, resulting in complex battery pack cooling system and battery pack design and high cost. Utility Model Content

[0003] In view of this, the utility model provides a battery pack and an electric vehicle to solve the problems of complex battery pack cooling system and battery pack design and high cost in the prior art.

[0004] In a first aspect, the utility model provides a battery pack, comprising:

[0005] Box;

[0006] A battery module is arranged in the box;

[0007] A cooling plate is arranged on the top surface of the battery module; a cooling area having a coolant flow channel is provided on the cooling plate;

[0008] The battery pack disconnecting unit is arranged on the top surface of the cooling plate; the cooling area covers the top surface of the battery module and the bottom surface of the battery pack disconnecting unit.

[0009] Beneficial effect: In the battery pack of this structure, the cooling plate is arranged on the top surface of the battery module, and the battery module below and the battery pack circuit breaker unit above are cooled simultaneously by the cooling plate. Compared with the method of respectively arranging cooling plates at the bottom of the battery module and the bottom of the battery pack circuit breaker unit, the space occupied by the cooling structure can be reduced, and the pipeline layout of the coolant inlet and outlet pipes can be reduced, thereby simplifying the battery pack structure and reducing the production cost of the battery pack.

[0010] In an optional embodiment, the cooling area includes a first cooling area and a second cooling area, the flow channels of the first cooling area and the second cooling area are independent of each other, the second cooling area is arranged at the first end of the cooling plate, and the second end of the cooling plate is provided with a total inlet and a total outlet; the battery pack disconnecting unit is arranged on the top of the second cooling area, and the first cooling area and the second cooling area cover the top of the battery module;

[0011] The cooling liquid flow channel of the first cooling area has a first inlet and a first outlet at both ends, and the cooling liquid flow channel of the second cooling area has a second inlet and a second outlet at both ends.

[0012] The total inlet is connected to the first outlet through a coolant flow channel, the first outlet is connected to the second inlet through a first adapter, the second outlet is connected to the first inlet through a second adapter, and the first inlet is connected to the total outlet through a coolant flow channel.

[0013] Beneficial effect: The first cooling area and the second cooling area are independent of each other, and the two cooling areas are connected by the first adapter and the second adapter, so that the coolant flowing through a part of the first cooling area first enters the second cooling area through the first outlet, the second inlet and the first adapter, and then enters another area of ​​the first cooling area through the second outlet and the first inlet, thereby avoiding the coolant at the end of the first cooling area from flowing into the second cooling area again, and can effectively ensure the cooling effect of the second cooling area on the battery pack circuit breaker unit, thereby effectively reducing the temperature of the battery pack circuit breaker unit during fast charging and improving the thermal management function of the battery pack system.

[0014] In an optional embodiment, the first inlet and the first outlet are arranged on two sides of the second cooling area opposite to each other.

[0015] Beneficial effect: The first adapter is adapted to connect the first cooling area to the second cooling area, and the second adapter is adapted to connect the second cooling area to the first cooling area, while facilitating the arrangement of coolant channels in the first cooling area and the second cooling area.

[0016] In an optional embodiment, the first cooling region includes an outlet side cooling region and an inlet side cooling region, the first outlet is located at the coolant outlet end of the outlet side cooling region, and the first inlet is located at the coolant inlet end of the inlet side cooling region; the total inlet is connected to two groups of inlet flow channels, and the two groups of inlet flow channels are respectively connected to the outlet side cooling region and the inlet side cooling region.

[0017] Beneficial effect: Another part of the coolant entering through the main inlet flows to the inlet side cooling area through another inlet flow channel, so that part of the coolant enters the inlet side cooling area first, which can effectively ensure the cooling effect on the battery module below the inlet side cooling area.

[0018] In an optional embodiment, the first outlet, the first inlet, the second inlet and the second outlet all include flow holes arranged on the cooling plate, the first adapter covers and seals the first outlet and the second inlet, and the first adapter and the surface of the cooling plate form a first flow channel; the second adapter covers and seals the second outlet and the first inlet, and the second adapter and the surface of the cooling plate form a second flow channel.

[0019] In an optional embodiment, a first heat conductor is provided between the top surface of the battery module and the bottom surface of the cooling plate; and a second heat conductor is provided between the bottom surface of the battery pack disconnecting unit and the top surface of the cooling plate.

[0020] In an optional embodiment, the first heat-conducting member includes a heat-conducting structural adhesive layer, and the top surface of the battery module is fixed to the bottom surface of the cooling plate through the heat-conducting structural adhesive layer; the bottom surface of the battery module is adhesively fixed to the bottom plate of the box;

[0021] And / or, the second heat conducting member includes a heat conducting pad.

[0022] In an optional embodiment, the cooling plate covers and is connected to the box body;

[0023] And / or, the battery pack further comprises a maintenance cover, wherein the maintenance cover is detachably sealed and arranged outside the battery pack disconnecting unit.

[0024] In an optional embodiment, a connecting wire channel is provided on the cooling plate, and the connecting wire channel is used for allowing the connecting wires on the battery module to pass through so that the connecting wires are connected to the battery pack disconnecting unit.

[0025] In a second aspect, the utility model further provides an electric vehicle, comprising any one of the above-mentioned battery packs. The electric vehicle comprises a battery pack, which has the same technical effects as the battery pack and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 An exploded view of a battery pack according to an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0029] Figure 3 A top view of the cooperation between a cooling plate and a box body in a battery pack according to an embodiment of the utility model;

[0030] Figure 4 An exploded view of a cooling plate in a battery pack according to an embodiment of the utility model;

[0031] Figure 5 A side view of a battery pack according to an embodiment of the present utility model;

[0032] Figure 6 It is a top view of a battery module and a box in a battery pack according to an embodiment of the utility model.

[0033] Description of reference numerals:

[0034] 1. Box body; 2. Battery module; 3. Cooling plate; 301. Main inlet; 302. Main outlet; 303. First cooling area; 3031. Cooling area on the inlet side; 30311. First inlet; 3032. Cooling area on the outlet side; 30321. First outlet; 304. Second cooling area; 3041. Second inlet; 3042. Second outlet; 305. Connection line channel; 306. Support plate; 307. Flow channel plate; 308. Inlet flow channel; 4. Battery pack disconnect unit; 5. First adapter; 6. Second adapter; 7. Second heat conducting member; 8. Maintenance cover; 9. Sealing strip; 10. Sealing area; 11. Bottom guard plate; 12. Longitudinal beam; 13. Cross beam. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0036] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0037] According to an embodiment of the utility model, on the one hand, a battery pack is provided, comprising a box body 1, a battery module 2, a cooling plate 3 and a battery pack disconnecting unit 4. The battery module 2 is arranged in the box body 1; the cooling plate 3 is arranged on the top surface of the battery module 2; a cooling area with a coolant flow channel is arranged on the cooling plate 3; the battery pack disconnecting unit 4 is arranged on the top surface of the cooling plate 3; the cooling area covers the top surface of the battery module 2 and the bottom surface of the battery pack disconnecting unit 4.

[0038] In the battery pack of this structure, the cooling plate 3 is arranged on the top surface of the battery module 2, and the battery module 2 below and the battery pack disconnect unit 4 above are cooled simultaneously by the cooling plate 3. Compared with the method of respectively arranging the cooling plates 3 at the bottom of the battery module 2 and the bottom of the battery pack disconnect unit 4, the space occupied by the cooling structure can be reduced, and the pipeline layout of the coolant inlet and outlet pipes can be reduced, thereby simplifying the battery pack structure and reducing the production cost of the battery pack.

[0039] Optionally, in some embodiments, Figure 3 As shown, the cooling area includes a first cooling area 303 and a second cooling area 304, the flow channels of the first cooling area 303 and the second cooling area 304 are independent of each other, the second cooling area 304 is arranged at the first end of the cooling plate 3, and the second end of the cooling plate 3 is provided with a total inlet 301 and a total outlet 302; the battery pack disconnecting unit 4 is arranged on the top of the second cooling area 304, and the first cooling area 303 and the second cooling area 304 cover the top of the battery module 2; the two ends of the coolant flow channel of the first cooling area 303 have a first inlet 30311 and a first outlet 30321, the two ends of the coolant flow channel of the second cooling area 304 have a second inlet 3041 and a second outlet 3042, the total inlet 301 is connected to the first outlet 30321 through the coolant flow channel, the first outlet 30321 is connected to the second inlet 3041 through the first adapter 5, the second outlet 3042 is connected to the first inlet 30311 through the second adapter 6, and the first inlet 30311 is connected to the total outlet 302 through the coolant flow channel.

[0040] The second cooling area 304 is used to cool the battery pack disconnecting unit 4 located at the top thereof, and the first cooling area 303 and the second cooling area 304 cool the battery module 2 at the bottom at the same time. The coolant enters from the main inlet 301, flows through the coolant flow channel of the first cooling area 303 to the first outlet 30321, flows through the first outlet 30321 to the first adapter 5, and then flows from the first adapter 5 to the second cooling area 304, the coolant flows along the coolant flow channel of the second cooling area 304 to the second outlet 3042, the coolant flows to the second adapter 6, and then enters the first cooling area 303 through the first inlet 30311, and finally the coolant flows through the coolant flow channel of the first cooling area 303 to the main outlet 302 and then flows out, completing the circulation cooling process of the coolant. If the two cooling areas are directly connected to each other, the coolant enters the first cooling area 303 through the main inlet 301, and then flows through the end of the first cooling area 303 and enters the second cooling area 304. At this time, the coolant has increased in temperature after heat exchange with the battery module 2 in the first cooling area 303. The coolant with increased temperature then enters the second cooling area 304, which will affect the cooling effect of the battery pack disconnecting unit 4. In order to avoid this problem, Figure 3 As shown, the first cooling area 303 and the second cooling area 304 of the utility model are independent of each other, and the two cooling areas are connected by the first adapter 5 and the second adapter 6, so that the coolant flowing through a part of the first cooling area 303 first enters the second cooling area 304 through the first outlet 30321, the second inlet 3041 and the first adapter 5, and then enters another area of ​​the first cooling area through the second outlet 3042 and the first inlet 30311, so as to avoid the coolant at the end of the first cooling area 303 from flowing into the second cooling area 304 again, and can effectively ensure the cooling effect of the second cooling area 304 on the battery pack circuit breaker unit 4, thereby effectively reducing the temperature of the battery pack circuit breaker unit 4 during fast charging, and improving the thermal management function of the battery pack system.

[0041] Optionally, in some embodiments, Figure 3 and Figure 4 As shown, the first inlet 30311 and the first outlet 30321 are relatively arranged on both sides of the second cooling area 304, so that the first adapter 5 transfers the first cooling area 303 and the second cooling area 304, and the second adapter 6 transfers the second cooling area 304 and the first cooling area 303, while facilitating the arrangement of the coolant flow channels in the first cooling area 303 and the second cooling area 304.

[0042] like Figure 3As shown, in some embodiments, the first cooling region 303 includes an outlet side cooling region 3032 and an inlet side cooling region 3031, the first outlet 30321 is located at the coolant outlet end of the outlet side cooling region 3032, and the first inlet 30311 is located at the coolant inlet end of the inlet side cooling region 3031; the total inlet 301 is connected to two groups of inlet flow channels 308, and the two groups of inlet flow channels 308 are respectively connected to the outlet side cooling region 3032 and the inlet side cooling region 3031. The coolant enters through the main inlet 301, and a part of the coolant enters the outlet side cooling area 3032 through an inlet flow channel 308, and then flows to the first outlet 30321 through the outlet side cooling area 3032; the other part of the coolant entering through the main inlet 301 flows to the inlet side cooling area 3031 through another inlet flow channel 308, so that part of the coolant enters the inlet side cooling area 3031 first, which can effectively ensure the cooling effect on the battery module 2 below the inlet side cooling area 3031; the coolant flowing out through the second outlet 3042 flows into the inlet side cooling area 3031 through the first inlet 30311, and cools the battery module 2 below the inlet side cooling area 3031 together with the coolant flowing to the inlet side cooling area 3031 through the inlet flow channel 308.

[0043] like Figure 3 As shown, the inlet flow channel 308 near one end of the outlet cooling area 3032 is connected to two first branch flow channels at one end near the second cooling area 304. A first converging flow channel is provided at the edge of the outlet cooling area 3032, one of the first branch flow channels is connected to the first converging flow channel by a detour, and the end of the first converging flow channel is the first outlet 30321, so that the coolant entering the outlet cooling area 3032 can quickly flow to the first outlet 30321, and then enter the second cooling area 304 through the second inlet 3041, which can ensure that the coolant with a lower temperature enters the second cooling area 304, thereby effectively ensuring the cooling effect on the second cooling area 304. Another first branch flow channel is connected to the first converging flow channel after being bent and detour.

[0044] like Figure 3 As shown, the inlet side cooling area 3031 includes a second branch flow channel and a second confluence flow channel, the second confluence flow channel is located at the edge of the inlet side cooling area 3031, the inlet flow channel 308 close to the inlet side cooling area 3031 is connected to the second branch flow channel, the second branch flow channel is connected to the main outlet 302 after bending and winding, the first inlet 30311 is located at the inlet end of the second confluence flow channel, the coolant flowing in through the first inlet 30311 directly flows through the second confluence flow channel to the main outlet 302 and then flows out.

[0045] like Figure 4As shown, in some embodiments, the first outlet 30321, the first inlet 30311, the second inlet 3041 and the second outlet 3042 all include flow holes provided on the cooling plate 3, the first adapter 5 covers and seals on the first outlet 30321 and the second inlet 3041, and the first adapter 5 and the surface of the cooling plate 3 form a first flow passage; the second adapter 6 covers and seals on the second outlet 3042 and the first inlet 30311, and the second adapter 6 and the surface of the cooling plate 3 form a second flow passage. The coolant flowing out of the first outlet 30321 enters the first flow passage, and then flows into the second cooling area 304 through the second inlet 3041, and the coolant flowing out of the second outlet 3042 enters the second flow passage, and then flows into the inlet side cooling area 3031 through the first inlet 30311. The transfer mechanism formed by the first adapter 5 and the second adapter 6 has a simple and reliable structure and occupies a small space.

[0046] like Figure 4 As shown, the first adapter 5 and the second adapter 6 have the same structure, wherein the middle part thereof protrudes upwardly away from the cooling plate 3, and the first adapter 5 and the second adapter 6 are sealedly connected to the cooling plate 3 on one side facing the cooling plate 3 to form a first flow channel and a second flow channel with the surface of the cooling plate 3.

[0047] like Figure 4 As shown, in some embodiments, the cooling plate 3 includes a support plate 306 and a flow channel plate 307. The support plate 306 is in the shape of a flat plate, and a flow channel groove is provided on the flow channel plate 307. The support plate 306 and the flow channel plate 307 are sealed and connected to form a coolant flow channel. Optionally, the support plate 306 faces the battery module 2 to facilitate bonding and fixing the battery module 2.

[0048] Optionally, in some embodiments, a first heat conductor is provided between the top surface of the battery module 2 and the bottom surface of the cooling plate 3, so that the heat of the battery module 2 is effectively and quickly transferred to the coolant through the first heat conductor; a second heat conductor 7 is provided between the bottom surface of the battery pack disconnecting unit 4 and the top surface of the cooling plate 3, so that the heat of the battery pack disconnecting unit 4 is effectively and quickly transferred to the coolant through the second heat conductor 7.

[0049] Optionally, in some embodiments, the first heat conductive member includes a heat conductive structural adhesive layer, and the top surface of the battery module 2 is fixed to the bottom surface of the cooling plate 3 through the heat conductive structural adhesive layer; the bottom surface of the battery module 2 is adhesively fixed to the bottom plate of the box body 1, thereby stably fixing the battery module 2 on the box body 1.

[0050] Optionally, in some embodiments, Figure 5As shown, the second heat conducting member 7 includes a heat conducting pad, and the heat of the battery pack disconnecting unit 4 is quickly transferred to the coolant through the heat conducting pad. When the battery pack disconnecting unit 4 fails and needs to be disassembled for repair, the bottom of the battery pack disconnecting unit 4 is not fixed by a heat conducting structural adhesive, which facilitates the disassembly of the battery pack disconnecting unit 4.

[0051] Optionally, the battery pack disconnecting unit 4 is fixed to the cooling plate 3 by bolts.

[0052] like Figure 1 and Figure 3 As shown, the cooling plate 3 covers and is connected to the box body 1, and the cooling plate 3 directly serves as the upper cover of the battery pack. Compared with the existing battery pack structure, the upper cover can be omitted, saving material costs.

[0053] Optionally, the outer edge of the cooling plate 3 is connected to the box body 1 by bolts.

[0054] like Figure 1 and Figure 5 As shown, the battery pack also includes a maintenance cover 8, which is a detachable sealing cover arranged outside the battery pack circuit breaker unit 4. The maintenance cover 8 can protect the battery pack circuit breaker unit 4 and play a role in dust and rain protection, thereby preventing the battery pack circuit breaker unit 4 from being damaged by external forces. At the same time, the maintenance cover 8 is detachable. When the battery pack circuit breaker unit 4 needs to be repaired, the maintenance cover 8 can be directly removed to repair the battery pack circuit breaker unit 4.

[0055] The maintenance cover 8 is fixed on the cooling plate 3 outside the first cooling area 303. Figure 2 and Figure 3 As shown, a circle of connection points is provided on the outer periphery of the first cooling area 303, and the maintenance cover 8 is fixed on the connection points by bolts. A circle of sealing area 10 is also provided on the inner side of the connection points, and a sealing strip 9 is provided on the sealing area 10. The sealing strip 9 is sealed between the maintenance cover 8 and the cooling plate 3, which can effectively ensure the sealing effect between the maintenance cover 8 and the cooling plate 3. A plane area is provided on the cooling plate 3, and the sealing area 10 is provided on the plane area.

[0056] like Figure 3 As shown, in some embodiments, a connection line channel 305 is provided on the cooling plate 3, and the connection line channel 305 is used for the connection line on the battery module 2 to pass through, so that the connection line is connected to the battery pack disconnecting unit 4, thereby realizing the through-connection of the connection lines on the upper and lower sides of the cooling plate 3. The connection line channel 305 provides a channel for the connection lines such as the high-voltage copper busbar and the wiring harness below the cooling plate 3 to connect to the battery pack disconnecting unit 4 above the cooling plate 3.

[0057] like Figure 1 and Figure 5 As shown, the battery pack further includes a bottom guard plate 11, which is fixed to the bottom of the box body 1 to protect the battery pack.

[0058] like Figure 6 As shown, in some embodiments, the cross-section of the box body 1 is rectangular, having long sides and wide sides. Optionally, three groups of battery modules 2 are provided along the width direction of the box body 1, a longitudinal beam 12 is provided between adjacent battery modules 2, and a cross beam 13 is also provided in the middle position in the length direction of the box body 1. The cross beam 13 is located at the column collision position of the whole vehicle, which can effectively improve the safety performance of the column collision of the whole vehicle. The height of the longitudinal beam 12 and the cross beam 13 is lower than the height of the battery module 2, so as to form an accommodation space below the top surface of the battery module 2 and above the longitudinal beam 12 and the cross beam 13, and the accommodation space can be used to arrange the front drive positive copper bus, the front drive negative copper bus and the battery pack negative copper bus.

[0059] According to an embodiment of the present utility model, on the other hand, an electric vehicle is provided, comprising any one of the battery packs described above.

[0060] An electric vehicle with this structure can cool the battery module 2 at the bottom of the battery pack and the battery pack disconnect unit 4 at the top thereof through the cooling plate 3, thereby reducing the space occupied by the cooling structure and the layout of the liquid inlet and outlet pipes, thereby simplifying the battery pack structure and reducing the manufacturing cost of the battery pack, thereby simplifying the overall structure of the electric vehicle and reducing the overall cost of the vehicle.

[0061] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: Box; A battery module is arranged in the box; A cooling plate is arranged on the top surface of the battery module; a cooling area having a coolant flow channel is provided on the cooling plate; The battery pack disconnecting unit is arranged on the top surface of the cooling plate; the cooling area covers the top surface of the battery module and the bottom surface of the battery pack disconnecting unit.

2. The battery pack according to claim 1, characterized in that: The cooling area includes a first cooling area and a second cooling area, the flow channels of the first cooling area and the second cooling area are independent of each other, the second cooling area is arranged at the first end of the cooling plate, and the second end of the cooling plate is provided with a total inlet and a total outlet; the battery pack disconnecting unit is arranged on the top of the second cooling area, and the first cooling area and the second cooling area cover the top of the battery module; The cooling liquid flow channel of the first cooling area has a first inlet and a first outlet at both ends, and the cooling liquid flow channel of the second cooling area has a second inlet and a second outlet at both ends; The total inlet is connected to the first outlet through a coolant flow channel, the first outlet is connected to the second inlet through a first adapter, the second outlet is connected to the first inlet through a second adapter, and the first inlet is connected to the total outlet through a coolant flow channel.

3. The battery pack according to claim 2, characterized in that: The first inlet and the first outlet are arranged opposite to each other at two sides of the second cooling area.

4. The battery pack according to claim 3, characterized in that: The first cooling region includes an outlet side cooling region and an inlet side cooling region, the first outlet is located at the coolant outlet end of the outlet side cooling region, and the first inlet is located at the coolant inlet end of the inlet side cooling region; the total inlet is connected to two groups of inlet flow channels, and the two groups of inlet flow channels are respectively connected to the outlet side cooling region and the inlet side cooling region.

5. The battery pack according to any one of claims 2 to 3, characterized in that: The first outlet, the first inlet, the second inlet and the second outlet all include flow holes provided on the cooling plate, the first adapter covers and seals the first outlet and the second inlet, and the first adapter and the surface of the cooling plate form a first flow channel; The second transition piece covers and seals the second outlet and the first inlet, and the second transition piece and the surface of the cooling plate form a second flow channel.

6. The battery pack according to any one of claims 1 to 4, characterized in that: A first heat-conducting member is provided between the top surface of the battery module and the bottom surface of the cooling plate; a second heat-conducting member is provided between the bottom surface of the battery pack disconnecting unit and the top surface of the cooling plate.

7. The battery pack according to claim 6, characterized in that: The first heat-conducting member includes a heat-conducting structural adhesive layer, and the top surface of the battery module is fixed to the bottom surface of the cooling plate through the heat-conducting structural adhesive layer; the bottom surface of the battery module is adhesively fixed to the bottom plate of the box body; And / or, the second heat conducting member includes a heat conducting pad.

8. The battery pack according to any one of claims 1 to 4, characterized in that: The cooling plate covers and is connected to the box body; And / or, the battery pack further comprises a maintenance cover, wherein the maintenance cover is detachably sealed and arranged outside the battery pack disconnecting unit.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The cooling plate is provided with a connecting wire channel, and the connecting wire channel is used for the connecting wire on the battery module to pass through so that the connecting wire is connected to the battery pack disconnecting unit.

10. An electric vehicle, characterized in that: A battery pack comprising any one of claims 1 to 9.

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