Battery pack and vehicle

Abstract

The present application relates to the technical field of battery, in particular to a battery pack and a vehicle, the battery pack and the vehicle provided by the present application, comprising a box body, a battery cell, a support beam and a heat exchange device, wherein the support beam is connected to the inside of the box body, the support beam is provided with a plurality of support beams, the plurality of support beams are arranged at intervals, the adjacent support beams form a battery cell mounting space, and the support beam is provided with a first flow channel structure for the circulation of a heat exchange medium; the battery cell comprises a first surface and a second surface arranged oppositely, the first surface faces the bottom wall of the box body, and the pole and the explosion-proof valve of the battery cell are arranged on the first surface; a plurality of battery cells are arranged in the battery cell mounting space along a first direction to form a battery cell group, and the battery cell group is connected to the support beam in a second direction; the heat exchange device is arranged between the top wall of the box body and the second surface of the battery cell, the battery pack and the vehicle provided by the present application can improve the heat dissipation effect of the battery pack.

Description

TECHNICAL FIELD

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

[0002] The endurance and battery safety of a new energy vehicle are important factors affecting the quality of the vehicle. The battery pack of a new energy vehicle is usually provided with a heat exchange device, and the cooling medium inside the heat exchange device can exchange heat with the battery cells inside the battery pack to cool or heat the battery cells.

[0003] In the prior art, the heat exchange device arranged on the side of the battery pack is connected to the long side of the battery cell through a heat-conducting adhesive. The heat generated by the battery cell is conducted to the heat exchange device through the heat-conducting adhesive, and then the heat is carried out by the heat exchange medium of the heat exchange device. However, the heat dissipation effect of the battery pack in the prior art is poor.

[0004] Therefore, how to improve the heat dissipation effect of the battery pack has become an important technical problem to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides a battery pack and a vehicle, which can improve the heat dissipation effect of the battery pack.

[0006] In a first aspect, the present application provides a battery pack, comprising a box body, a battery cell, a support beam and a heat exchange device, wherein

[0007] The support beam is connected to the inside of the box body, and a plurality of support beams are arranged at intervals. The battery cell mounting space is formed between adjacent support beams, and the support beam is provided with a first flow channel structure for the flow of heat exchange medium.

[0008] The battery cell comprises a first surface and a second surface arranged opposite to each other. The first surface faces the bottom wall of the box body, and the pole and the explosion-proof valve of the battery cell are arranged on the first surface.

[0009] A plurality of battery cells are arranged in the battery cell mounting space along a first direction to form a battery cell group, and the battery cell group is connected to the support beam in a second direction.

[0010] The heat exchange device is arranged between the top wall of the box body and the second surface of the battery cell.

[0011] According to the battery pack provided by the present application, the battery cell is arranged as a square battery cell, the battery cell comprises adjacent first and second side surfaces, the first side surface is connected to the support beam, and the length of the first side surface along the first direction is less than the length of the second side surface along the second direction.

[0012] The battery pack provided by the application, the first surface of the battery cell is spaced apart from the bottom wall of the box body, and the spacing distance is 8-20 mm.

[0013] The battery pack provided by the application, the support beam comprises:

[0014] The main beam part, the first side surface of the battery cell is connected to the main beam part;

[0015] The bottom beam part is arranged at the bottom end of the main beam part, and the width of the bottom beam part is greater than the width of the main beam part, the bottom beam part is connected to the first surface of the battery cell, and a plurality of first connecting structures are arranged on the bottom beam part along the length direction of the bottom beam part, and the bottom beam part is connected to the bottom wall of the box body through the first connecting structures.

[0016] The battery pack provided by the application, the support beam further comprises:

[0017] The top beam part is arranged at the top end of the main beam part, and the width of the top beam part is greater than the width of the main beam part, a plurality of second connecting structures are arranged on the top beam part along the length direction of the top beam part, and the top beam part is connected to the top wall of the box body through the second connecting structures.

[0018] The battery pack provided by the application, the main beam part is provided with a plurality of first flow channel structures, and each first flow channel structure penetrates the main beam part along the length direction of the main beam part;

[0019] The battery pack further comprises:

[0020] The first cooling liquid pipeline, the inlet end of each first flow channel structure is respectively communicated with the first cooling liquid pipeline;

[0021] The second cooling liquid pipeline, the outlet end of each first flow channel structure is respectively communicated with the second cooling liquid pipeline.

[0022] The battery pack provided by the application further comprises:

[0023] The anti-bulging beam, the two ends of the anti-bulging beam are respectively fixedly connected with adjacent support beams, the anti-bulging beam comprises a main beam surface, and the main beam surface is pressed against the second side surface of the battery cell to prevent the second side surface from bulging.

[0024] The battery pack provided by the application, the heat exchange device is filled with a heat insulation layer between the top wall of the box body.

[0025] In a second aspect, the application provides a vehicle comprising a motor and a battery pack, the battery pack is adapted to supply electric energy to the motor, and the battery pack is arranged as the battery pack in any one of the above.

[0026] The vehicle provided by the application further comprises a radiator, a control valve assembly and a controller.

[0027] The control valve assembly comprises a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port and an eighth valve port.

[0028] The first water port of the motor communicates with the first valve port, and the second water port of the motor communicates with the second valve port.

[0029] The first water port of the heat exchange device communicates with the third valve port, and the second water port of the heat exchange device communicates with the fourth valve port.

[0030] The first water port of the radiator communicates with the fifth valve port, and the second water port of the radiator communicates with the sixth valve port.

[0031] The seventh valve port communicates with the eighth valve port.

[0032] The controller is adapted to control the control valve assembly to switch between a first valve position, a second valve position and a third valve position.

[0033] In the first valve position state, the first valve port and the fifth valve port are open, the seventh valve port and the third valve port are open, the second valve port and the eighth valve port are open, and the fourth valve port and the sixth valve port are open.

[0034] In the second valve position state, the first valve port and the fifth valve port are open, and the second valve port and the sixth valve port are open.

[0035] In the third valve position state, the first valve port, the third valve port and the fifth valve port are open, the second valve port and the sixth valve port are open, and the sixth valve port and the eighth valve port are open.

[0036] The vehicle provided by the application further comprises:

[0037] A battery heat exchanger, a first water port of which communicates with the water inlet of the first flow channel structure of each support beam, and a second water port of which communicates with the water outlet of the first flow channel structure of each support beam.

[0038] The controller is adapted to control the battery heat exchanger to switch between a heating mode and a cooling mode.

[0039] The vehicle provided by the application further comprises:

[0040] A first temperature sensor adapted to sense the temperature of the heat exchange medium at the outlet end of the motor heat exchange medium.

[0041] a second temperature sensor adapted to sense the temperature of the heat exchange medium at the inlet end of the heat exchange device;

[0042] a third temperature sensor adapted to sense the temperature of the body of the battery cell;

[0043] The controller is in communication with the first temperature sensor, the second temperature sensor and the third temperature sensor, and the controller is adapted to:

[0044] when the temperature of the body of the battery cell is lower than a first preset temperature and the temperature of the heat exchange medium at the outlet end of the motor is higher than the temperature of the heat exchange medium at the inlet end of the heat exchange device, control the control valve assembly to be in the first valve position, and control the battery heat exchanger to be in a heating mode and in communication with the first flow channel structure;

[0045] and / or, when the temperature of the body of the battery cell is lower than a first preset temperature and the temperature of the heat exchange medium at the outlet end of the motor is lower than the temperature of the heat exchange medium at the inlet end of the heat exchange device, control the control valve assembly to be in the second valve position, and control the battery heat exchanger to be in a heating mode and in communication with the first flow channel structure;

[0046] and / or, when the temperature of the body of the battery cell is higher than a second preset temperature and the temperature of the heat exchange medium at the inlet end of the heat exchange device is higher than the temperature of the heat exchange medium at the outlet end of the motor, control the control valve to be in the third valve position, and control the battery heat exchanger to be in a cooling mode and in communication with the first flow channel structure.

[0047] Advantages:

[0048] The battery pack provided by the application has a plurality of support beams connected in the interior of the box body, which divides the interior of the box body into a plurality of electric cell mounting spaces. For example, each support beam can be a long strip plate structure, the length directions of the support beams are parallel, and the support beams are arranged in pairs in a face-to-face manner. In this way, the electric cell mounting space is formed between the adjacent two support beams. Each electric cell mounting space is used for mounting a plurality of electric cells arranged side by side, and the plurality of electric cells form an electric cell group in the electric cell mounting space along a first direction. The first direction can be parallel to the length direction of the support beam. The electric cell group is connected with the support beam in a second direction, and the second direction can be perpendicular to the first direction. The electric cell comprises a first surface and a second surface. The first surface is a surface of the electric cell facing the bottom wall of the box body, and the pole and the explosion-proof valve of the electric cell are arranged on the first surface. The second surface is a surface opposite to the first surface of the electric cell, that is, the second surface of the electric cell faces the top wall of the box body. In the scheme, a heat exchange device is arranged between the top wall of the box body and the second surface of the electric cell. The heat exchange device can exchange heat with the second surface of each electric cell. Meanwhile, a first flow channel structure for circulating heat exchange medium is arranged in each support beam. The heat exchange medium in the first flow channel structure can exchange heat with the electric cell, so as to heat or cool the electric cell. In this way, the heat exchange of the electric cell from three surfaces is realized, and the heat exchange effect is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings required to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0050] Figure 1 It is an explosion schematic diagram of the battery pack of the embodiment of the application.

[0051] Figure 2 It is a partial schematic diagram of the internal structure of the battery pack of the embodiment of the application.

[0052] Figure 3 It is a partial sectional view of the internal structure of the battery pack of the embodiment of the application.

[0053] Figure 4 It is a schematic diagram of the heat management flow path structure of the embodiment of the application.

[0054] Explanation of reference signs:

[0055] 11, box; 111, top wall of the box; 112, bottom wall of the box; 12, heat exchange device; 13, support beam; 131, top beam part; 132, second connecting structure; 133, first flow channel structure; 134, bottom beam part; 14, battery cell; 141, second surface of the battery cell; 15, anti-bulging beam; 16, battery cell mounting space; 17, motor; 18, control valve assembly; 19, battery heat exchanger; 20, radiator. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0057] As shown in Figures 1 to 3 The embodiments of the present application provide a battery pack, which comprises a box 11, a battery cell 14, a support beam 13, and a heat exchange device 12.

[0058] In some embodiments, the box 11 can comprise an upper box and a lower box connected by a connecting structure, wherein the lower box refers to the part of the box 11 close to the ground in the state that the battery pack is installed on a vehicle, and the upper box refers to the part opposite to the lower box. The box 11 comprises a top wall and a bottom wall, wherein the bottom wall 112 of the box refers to the wall of the box 11 facing the ground in the state that the box 11 is installed on a vehicle, and the top wall refers to the wall opposite to the bottom wall.

[0059] The battery cell 14, the support beam 13 and the heat exchange device 12 are all installed inside the box 11, wherein the support beam 13 is provided in plurality, the plurality of support beams 13 are arranged at intervals, the adjacent support beams 13 form a battery cell mounting space 16 therebetween, and the support beam 13 is provided with a first flow channel structure 133 for the circulation of heat exchange medium. Each two adjacent support beams 13 form a battery cell mounting space 16 for mounting a group of battery cells 14, and the plurality of support beams 13 constitute a plurality of battery cell mounting spaces 16. In the present embodiment, the battery cell mounting spaces 16 can be independent of each other, so as to avoid the influence of the battery cells 14 in one of the battery cell mounting spaces 16 on the battery cells 14 in other battery cell mounting spaces 16 when the battery cells 14 in the one of the battery cell mounting spaces 16 have thermal runaway.

[0060] The battery cell 14 includes a first surface and a second surface that are arranged opposite each other. The first surface faces the bottom wall 112 of the box, and the battery cell 14's poles and explosion-proof valve are both located on the first surface. The first surface of the battery cell 14 faces the bottom wall 112 of the box, that is, the first surface of the battery cell 14 is the bottom surface of the battery cell 14. The second surface 141 of the battery cell is arranged opposite the first surface and faces the top wall 111 of the box, that is, the second surface of the battery cell 14 is the top surface of the battery cell 14. The battery cell 14's poles and explosion-proof valve are both located on the bottom surface of the battery cell 14.

[0061] like Figure 2 As shown, multiple battery cells 14 are arranged along a first direction within the battery cell installation space 16 to form a battery cell group, and the battery cell group is connected to the support beam 13 along a second direction. In some embodiments, the support beam 13 can be a strip-shaped plate structure, and the multiple support beams 13 can be arranged side by side and spaced apart along the second direction. That is, along the second direction, the multiple support beams 13 are arranged sequentially, and any two adjacent support beams 13 are arranged face to face, forming a battery cell installation space 16 therebetween. The multiple battery cells 14 are arranged along the first direction within the battery cell installation space 16. The first direction can be consistent with the length of the support beam 13, and the second direction is perpendicular to the first direction. The multiple battery cells 14 are arranged sequentially within the battery cell installation space 16 along the first direction, that is, the multiple battery cells 14 are arranged sequentially within the battery cell installation space 16 along the length of the support beam 13 to form a battery cell group. The battery cell group is connected to the corresponding support beam 13 at both ends along the second direction.

[0062] The heat exchange device 12 is disposed between the top wall 111 of the box and the second surface 141 of the battery cell, that is, the heat exchange device 12 is disposed between the top surface of the battery cell 14 and the top wall 111 of the box.

[0063] In this embodiment, a heat exchange device 12 is disposed between the top wall 111 of the housing and the second surface 141 of the battery cell. Heat exchange device 12 can exchange heat with the second surface 141 of each battery cell. Furthermore, each support beam 13 is internally provided with a first flow channel structure 133 for circulating a heat exchange medium. The heat exchange medium within the first flow channel structure 133 can exchange heat with the battery cell 14, thereby heating or cooling the battery cell 14. This achieves heat exchange on three sides of the battery cell 14, effectively improving the heat exchange effect.

[0064] In addition, in the embodiment, the pole of the battery cell 14 and the explosion-proof valve are both arranged on the first surface, that is, the pole of the battery cell 14 and the explosion-proof valve are both arranged on the bottom surface of the battery cell 14 facing the ground. In this way, when the explosion-proof valve discharges, the gas and high-temperature metal scraps discharged by the explosion-proof valve can be prevented from falling on the upper surface of the battery cell 14 or the pole and the busbar connected to the pole, thereby avoiding the risk of high-voltage insulation failure and battery short circuit. In addition, the high-temperature gas discharged by the battery cell 14 facing the ground can be prevented from entering the vehicle cabin, thereby avoiding the risk of carpet or seat burning.

[0065] In a further embodiment, the battery cell 14 is arranged as a square battery cell, and the battery cell 14 includes adjacent first and second side surfaces, the first side surface is connected to the support beam 13, and the length of the first side surface in the first direction is less than the length of the second side surface in the second direction. It should be noted that the battery cell 14 includes a top surface and a bottom surface, wherein the bottom surface of the battery cell 14 refers to the surface of the battery cell 14 facing the ground in the state that the battery pack is installed on the vehicle, and the top surface of the battery cell 14 is arranged opposite to the bottom surface of the battery cell 14. When the battery cell 14 is a square battery cell, that is, the battery cell 14 has a cuboid structure, the battery cell 14 has four side surfaces between the top surface and the bottom surface, wherein the first and second side surfaces are arranged adjacent to each other, and the length of the first side surface in the first direction is less than the length of the second side surface in the second direction, that is, the first side surface is the narrow side surface of the square battery, and the second side surface is the long side surface of the square battery.

[0066] In the embodiment, the battery cell 14 is arranged as a plurality of battery cells arranged in the battery cell mounting space 16, and the narrow side surface of each battery cell 14 is connected to the support beam 13. Even if the battery cell 14 swells due to charging, the swelling usually occurs on the long side surface of the battery cell 14, which does not affect the connection between the narrow side surface and the support beam 13, and further does not affect the heat exchange effect between the narrow side surface and the support beam 13. Therefore, the battery pack provided in the embodiment can ensure the heat exchange effect of the battery pack, and avoid the problem that the heat exchange effect is affected due to the swelling of the battery cell 14 caused by charging.

[0067] In a further embodiment, the first surface of the battery cell 14 is arranged spaced apart from the bottom wall 112 of the box body, and the spacing distance is 8-20 mm, that is, a gap of 8-20 mm is arranged between the bottom surface of the battery cell 14 and the bottom wall 112 of the box body. In this way, the gap can be used as an exhaust passage, that is, when the explosion-proof valve discharges, the gas can be discharged through the gap. In addition, when the vehicle is bottomed, even if the bottom wall of the box body 11 of the battery pack deforms, the reserved gap can prevent the bottom wall of the box body 11 from hard contacting the battery cell 14, thereby preventing the damage of the battery cell 14. In addition, the electrical components such as the busbar of the battery cell 14 can also be installed in the gap, thereby forming an independent gap passage that integrates the safety of the electrical components, the safety of the bottom anti-bottoming, and the safety of the exhaust.

[0068] In further embodiments, a layer of elastic thermal insulation material is arranged between the long side surfaces of adjacent battery cells 14. It should be noted that when selecting the elastic thermal insulation material, factors such as thermal insulation performance, elastic modulus, high and low temperature resistance, and chemical stability need to be considered comprehensively. In some embodiments, the layer of elastic thermal insulation material can be an aerogel layer, and a silica gel frame can be arranged at the edge position of the aerogel layer. The aerogel layer is clamped between the long side surfaces of two adjacent battery cells 14. Of course, in other embodiments, the layer of elastic thermal insulation material can also be polyimide foam, carbon fiber composite material, glass fiber reinforced composite material, fireproof paint, etc.

[0069] In this way, the layer of elastic thermal insulation material can play a thermal insulation effect, helping each battery cell 14 to work in a relatively independent temperature environment, reducing heat accumulation and temperature fluctuations, and thus improving the overall performance and safety of the battery pack. Moreover, since the battery cells 14 can undergo slight volume changes (such as charging bulging) due to internal chemical reactions during charging and discharging, the layer of elastic thermal insulation material can provide a certain buffering effect to absorb these slight deformations and prevent mechanical stress or damage between the battery cells 14 due to direct contact. In addition, if a certain battery cell 14 in the battery pack experiences thermal runaway (such as short circuit, overheating, etc.), its temperature will rise sharply, and the layer of elastic thermal insulation material can effectively slow down the heat transfer to adjacent battery cells 14.

[0070] In further embodiments, the support beam 13 includes a main beam portion and a bottom beam portion 134. The first side surface of the battery cell 14 is connected to the main beam portion, i.e., the narrow side surface of the battery cell 14 is connected to the main beam portion. The main beam portion can be specifically a long strip plate structure, and the narrow side surface of the battery cell 14 can be adhered to the beam surface of the main beam portion by a heat-conducting adhesive. The bottom beam portion 134 is provided with a plurality of first connecting structures along its length direction, and the bottom beam portion 134 is connected to the bottom wall 112 of the box body through the first connecting structures.

[0071] The bottom beam portion 134 is arranged at the bottom end of the main beam portion, and the width of the bottom beam portion 134 is greater than the width of the main beam portion. The bottom beam portion 134 is supported on the bottom surface of the battery cell 14. The width of the bottom beam portion 134 is greater than the width of the main beam portion, and the bottom beam portion 134 protrudes from the bottom of the main beam portion along its width direction. The protruding part is connected to the first surface of the battery cell 14, i.e., the bottom beam portion 134 is supported on the bottom surface of the battery cell 14. Under the support of the bottom beam portion 134, the bottom surface of the battery cell 14 can maintain a certain gap with the bottom wall 112 of the box body. Even if the connection between the battery cell 14 and the main beam portion fails, the battery cell 14 can still remain stable under the support of the bottom beam portion 134, and will not fall off onto the bottom wall 112 of the box body.

[0072] It should be further noted that the bottom beam part 134 is provided with a plurality of first connecting structures along the length direction thereof, and the bottom beam part 134 is connected to the bottom wall 112 of the box body through the first connecting structures, which can be screw holes, pin holes or the like. The bottom beam part 134 can be stably connected to the bottom wall 112 of the box body through screws inserted into the screw holes or pins inserted into the pin holes.

[0073] In further embodiments, the support beam 13 further comprises a top beam part 131, wherein the top beam part 131 is arranged at the top end of the main beam part, the width of the top beam part 131 is greater than that of the main beam part, and the top beam part 131 is provided with a plurality of second connecting structures 132 along the length direction thereof, and the top beam part 131 is connected to the top wall 111 of the box body through the second connecting structures 132.

[0074] In this way, the top beam part 131, the main beam part and the bottom beam part 134 jointly constitute an I-beam structure, the top of the I-beam structure is connected to the top wall 111 of the box body through the second connecting structures 132, and the bottom of the I-beam structure is connected to the bottom wall 112 of the box body through the first connecting structures. The narrow side surface of the battery cell 14 is connected to the main beam part between the top beam part 131 and the bottom beam part 134 of the I-beam structure, and the battery cell 14 is subjected to the constraint of the main beam part, the top beam part 131 and the bottom beam part 134, so that the connection between the battery cell 14 and the support beam 13 is more stable and reliable.

[0075] In further embodiments, the battery pack further comprises an anti-bulging beam 15, the two ends of the anti-bulging beam 15 are fixedly connected to adjacent support beams 13, and the anti-bulging beam 15 comprises a main beam surface which is pressed against the long side surface of the battery cell 14 to prevent the long side surface from bulging. The support beam 13 is provided with the anti-bulging beam 15 at both ends along the first direction, and the anti-bulging beam 15 is fixedly connected to the support beam 13 at both ends along the second direction. The battery cell group is arranged in the battery cell mounting space 16, and the two ends thereof along the first direction are connected to the anti-bulging beam 15. The anti-bulging beam 15 can limit the battery cell 14 and prevent the battery cell 14 from bulging.

[0076] In further embodiments, the main beam part of the support beam 13 is provided with a plurality of first flow channel structures 133, and each first flow channel structure 133 penetrates the main beam part along the length direction thereof. The battery pack further comprises a first cooling liquid pipeline and a second cooling liquid pipeline, wherein the inlet end of each first flow channel structure 133 is in communication with the first cooling liquid pipeline, and the outlet end of each first flow channel structure 133 is in communication with the second cooling liquid pipeline. The cooling medium enters each first flow channel structure 133 of the support beam 13 through the first cooling liquid pipeline, exchanges heat with the battery cell 14, and then flows out through the second cooling liquid pipeline.

[0077] In further embodiments, the heat exchange device 12 is integrally formed with the top wall 111 of the box body, or the heat exchange device 12 is detachably connected to the top wall 111 of the box body. For example, the heat exchange device 12 and the box body 11 can be integrally formed by welding, or can be integrally formed by a casting process. The heat exchange device 12 can be connected to the top wall 111 of the box body by screws, pins, or other connecting members. The heat exchange device 12 can specifically be a plate-shaped structure, and the plate-shaped structure has a heat exchange medium channel inside. The heat exchange medium flows into the heat exchange medium channel and can exchange heat with the battery cell 14. In order to improve the heat exchange efficiency, the heat exchange device 12 and the battery cell 14 are connected by a heat-conducting structural adhesive.

[0078] In order to avoid electric leakage and heat leakage of the heat exchange device 12, a heat insulation layer can be filled between the heat exchange device 12 and the top wall 111 of the box body. The heat insulation layer can specifically be an insulating polymer foaming material, aerogel material, or the like. In addition, the bottom wall 112 of the box body can be provided with an insulating layer to avoid the problem of electric leakage of the bottom wall of the box body 11. The insulating layer can specifically use insulating mica, high-molecular high-temperature-resistant insulating material, or the like.

[0079] In a second aspect, the embodiments of the present application also provide a vehicle, which includes a motor 17 and a battery pack. The battery pack is adapted to supply electric energy to the motor 17, and the battery pack is the battery pack according to any one of the above embodiments.

[0080] In this way, the vehicle provided by the embodiments has a battery pack with good heat dissipation effect. The derivation process of this beneficial effect is similar to that of the battery pack described above, and will not be repeated here.

[0081] In further embodiments, the vehicle further includes a radiator 20, a control valve assembly 18, and a controller. As shown in Figure 4 The control valve assembly 18 includes a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port, and an eighth valve port. Each valve port can be as shown by the labels in Figure 4 It should be noted that the control valve assembly 18 can be in the form of a valve group, that is, it includes at least two control valves, or it can be formed by one control valve, as long as it can achieve the functions described below.

[0082] The first water port of the motor 17 communicates with the first valve port, and the second water port of the motor 17 communicates with the second valve port. The first water port of the heat exchange device 12 communicates with the third valve port, and the second water port of the heat exchange device 12 communicates with the fourth valve port. The first water port of the radiator 20 communicates with the fifth valve port, and the second water port of the radiator 20 communicates with the sixth valve port. The seventh valve port communicates with the eighth valve port. The controller is adapted to control the control valve assembly 18 to switch between a first valve position, a second valve position, and a third valve position.

[0083] In the first valve position state, the first valve port and the fifth valve port are open, the seventh valve port and the third valve port are open, the second valve port and the eighth valve port are open, and the fourth valve port and the sixth valve port are open; in the second valve position state, the first valve port and the fifth valve port are open, and the second valve port and the sixth valve port are open; in the third valve position state, the first valve port, the third valve port and the fifth valve port are open, the second valve port and the sixth valve port are open, and the sixth valve port and the eighth valve port are open.

[0084] In further embodiments, the vehicle further comprises a battery heat exchanger 19, a first water port of the battery heat exchanger 19 is in communication with the water inlet port of the first flow channel structure 133 of each support beam 13, and a second water port of the battery heat exchanger 19 is in communication with the water outlet port of the first flow channel structure 133 of each support beam 13. The controller is further adapted to control the battery heat exchanger 19 to switch between a heating mode and a cooling mode.

[0085] In further embodiments, the vehicle further comprises a first temperature sensor, a second temperature sensor and a third temperature sensor.

[0086] The first temperature sensor is adapted to sense the temperature of the heat exchange medium at the outlet end of the motor heat exchange medium; the second temperature sensor is adapted to sense the temperature of the heat exchange medium at the inlet end of the heat exchange device heat exchange medium; and the third temperature sensor is adapted to sense the temperature of the body of the battery cell.

[0087] The controller is in communication connection with the motor temperature sensor and the battery cell temperature sensor, and the controller is adapted to:

[0088] When the temperature of the body of the battery cell 14 is determined to be lower than a first preset temperature, and the temperature of the heat exchange medium at the outlet end of the motor 17 heat exchange medium is higher than the temperature of the heat exchange medium at the inlet end of the heat exchange device 12 heat exchange medium, the controller controls the control valve assembly 18 to be in the first valve position, and controls the battery heat exchanger 19 to be in the heating mode and in communication with the first flow channel structure 133. In some embodiments, the first preset temperature can be 5°C. Thus, when the temperature of the battery cell 14 is determined to be lower than 5°C, and the temperature of the heat exchange medium at the outlet end of the motor 17 heat exchange medium is higher than the temperature of the heat exchange medium at the inlet end of the heat exchange device 12 heat exchange medium, the controller controls the control valve assembly 18 to be in the first valve position, and controls the battery heat exchanger 19 to be in the heating mode and in communication with the first flow channel structure 133, i.e., the first valve port and the fifth valve port of the control valve assembly are open, the seventh valve port and the third valve port are open, the second valve port and the eighth valve port are open, and the fourth valve port and the sixth valve port are open. At this time, the heat exchange medium circuit of the motor 17 and the heat exchange medium circuit of the heat exchange device 12 at the top of the battery pack are connected in series, and the battery heat exchanger 19 is in the heating mode, i.e., the support beam 13 heat exchange medium circuit of the battery pack is in the heating mode.

[0089] And / or, in the case that the body temperature of the battery cell 14 is determined to be lower than a first preset temperature, and the temperature of the heat exchange medium at the outlet end of the motor 17 is lower than the temperature of the heat exchange medium at the inlet end of the heat exchange device 12, the controller controls the control valve assembly 18 to be in the second valve position, and controls the battery heat exchanger 19 to start the heating mode and be in communication with the first flow channel structure 133; the first preset temperature can be 5℃. In this way, when the temperature of the battery cell 14 is determined to be lower than 5℃, and the temperature of the heat exchange medium at the outlet end of the motor 17 is lower than the temperature of the heat exchange medium at the inlet end of the heat exchange device 12, the controller controls the control valve assembly 18 to be in the second valve position, the first valve port and the fifth valve port are in communication, the second valve port and the sixth valve port are in communication; the heat exchange medium circuit of the heat exchange device 12 at the top of the battery pack is disconnected, and heating of the heat exchange device 12 is stopped, while the battery heat exchanger 19 starts the heating mode, i.e., the heat exchange medium circuit of the support beam 13 of the battery pack starts the heating mode.

[0090] And / or, in the case that the body temperature of the battery cell 14 is determined to be higher than a second preset temperature, and the temperature of the heat exchange medium at the inlet end of the heat exchange device 12 is higher than the temperature of the heat exchange medium at the outlet end of the motor 17, the controller controls the control valve to be in the third valve position, and controls the battery heat exchanger 19 to start the cooling mode and be in communication with the first flow channel structure 133. The second preset temperature is higher than the first preset temperature, and the second preset temperature can be 35℃. In this way, when the temperature of the battery cell 14 is determined to be higher than 35℃, and the temperature of the heat exchange medium at the inlet end of the heat exchange device 12 is higher than the temperature of the heat exchange medium at the outlet end of the motor 17, the controller controls the control valve to be in the third valve position, the first valve port, the third valve port and the fifth valve port are in communication, the second valve port and the sixth valve port are in communication, and the sixth valve port and the eighth valve port are in communication. At this time, the heat exchange medium circuit of the motor 17 and the heat exchange medium circuit of the heat exchange device 12 at the top of the battery pack are connected in parallel; at the same time, the battery heat exchanger 19 starts the cooling mode, i.e., the heat exchange medium circuit of the support beam 13 of the battery pack starts the cooling mode.

[0091] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A vehicle characterized by comprising: The vehicle comprises a motor (17) and a battery pack adapted to supply electric energy to the motor (17), the battery pack comprising a box body (11), battery cells (14), support beams (13) and a heat exchange device (12); wherein, The support beams (13) are connected inside the box body (11), and a plurality of support beams (13) are arranged at intervals, forming a battery cell mounting space (16) between adjacent support beams (13), and the support beams (13) are provided with a first flow channel structure (133) for the flow of heat exchange medium; The battery cell (14) comprises a first surface and a second surface arranged opposite to each other, the first surface faces the bottom wall (112) of the box body, and the pole and the explosion-proof valve of the battery cell (14) are arranged on the first surface; A plurality of battery cells (14) are arranged in the battery cell mounting space (16) to form a battery cell group in the first direction, and the battery cell group is connected with the support beam (13) in the second direction. The heat exchange device (12) is arranged between the top wall (111) of the box body and the second surface (141) of the battery cell. The vehicle further comprises a radiator (20), a control valve assembly (18) and a controller. The control valve assembly (18) comprises a first valve port, a second valve port, a third valve port, a fourth valve port, a fifth valve port, a sixth valve port, a seventh valve port and an eighth valve port. The first water port of the motor (17) is in communication with the first valve port, and the second water port of the motor (17) is in communication with the second valve port. The first water port of the heat exchange device (12) is in communication with the third valve port, and the second water port of the heat exchange device (12) is in communication with the fourth valve port. The first water port of the radiator (20) is in communication with the fifth valve port, and the second water port of the radiator (20) is in communication with the sixth valve port. The seventh valve port is in communication with the eighth valve port. The controller is adapted to control the control valve assembly (18) to switch between a first valve position, a second valve position and a third valve position. In the first valve position state, the first valve port and the fifth valve port are in communication, the seventh valve port is in communication with the third valve port, the second valve port is in communication with the eighth valve port, and the fourth valve port and the sixth valve port are in communication. In the second valve position state, the first valve port and the fifth valve port are in communication, and the second valve port and the sixth valve port are in communication. In the third valve position state, the first valve port, the third valve port and the fifth valve port are in communication, the second valve port and the sixth valve port are in communication, and the sixth valve port and the eighth valve port are in communication.

2. The vehicle of claim 1, wherein The battery cell (14) is arranged as a square battery cell, the battery cell (14) comprises adjacent first and second side surfaces, the first side surface is connected with the support beam (13), and the length of the first side surface in the first direction is less than the length of the second side surface in the second direction.

3. The vehicle of claim 1, wherein The first surface of the battery cell (14) is arranged at an interval of 8-20 mm from the bottom wall (112) of the box body.

4. The vehicle of claim 2, wherein The support beam (13) comprises: A main beam part, a first side surface of the electric core (14) is connected with the main beam part; A bottom beam part (134) is arranged at the bottom end of the main beam part, and the width of the bottom beam part (134) is greater than the width of the main beam part, the bottom beam part (134) is connected with the first surface of the electric core (14), and a plurality of first connecting structures are arranged on the bottom beam part (134) along the length direction of the bottom beam part (134), and the bottom beam part (134) is connected with the bottom wall (112) of the box through the first connecting structures.

5. The vehicle of claim 4, wherein, The support beam (13) further comprises: A top beam part (131) is arranged at the top end of the main beam part, and the width of the top beam part (131) is greater than the width of the main beam part, a plurality of second connecting structures (132) are arranged on the top beam part (131) along the length direction of the top beam part (131), and the top beam part (131) is connected with the top wall (111) of the box through the second connecting structures (132).

6. The vehicle of claim 4, wherein, The main beam part is provided with a plurality of first flow channel structures (133); The battery pack further comprises: A first cooling liquid pipeline, the inlet end of each first flow channel structure (133) is in communication with the first cooling liquid pipeline; A second cooling liquid pipeline, the outlet end of each first flow channel structure (133) is in communication with the second cooling liquid pipeline.

7. The vehicle of claim 2, wherein Further comprising: An anti-bulging beam (15) is fixedly connected with adjacent support beams (13) at both ends, and the anti-bulging beam (15) comprises a main beam surface which is pressed against the second side surface of the electric core (14) to prevent the second side surface from bulging.

8. The vehicle of claim 1, wherein A heat insulation layer is filled between the heat exchange device (12) and the top wall (111) of the box.

9. The vehicle of claim 1, wherein, Further comprising: A battery heat exchanger (19) is in communication with the water inlet of the first flow channel structure (133) of each support beam (13), and the second water outlet of the battery heat exchanger (19) is in communication with the water outlet of the first flow channel structure (133) of each support beam (13); The controller is adapted to control the battery heat exchanger (19) to switch between heating mode and cooling mode.

10. The vehicle of claim 9, wherein, Further comprising: A first temperature sensor is adapted to sense the temperature of the heat exchange medium at the outlet end of the motor (17); A second temperature sensor is adapted to sense the temperature of the heat exchange medium at the inlet end of the heat exchange device (12); A third temperature sensor is adapted to sense the body temperature of the electric core (14); The controller is in communication connection with the first temperature sensor, the second temperature sensor and the third temperature sensor, and the controller is adapted to: When it is determined that the body temperature of the electric core (14) is lower than a first preset temperature, and the temperature of the heat exchange medium at the outlet end of the motor (17) is higher than the temperature of the heat exchange medium at the inlet end of the heat exchange device (12), the controller controls the control valve assembly (18) to be in the first valve position, and controls the battery heat exchanger (19) to open the heating mode and be in conduction with the first flow channel structure (133). and / or, in a case where it is determined that the body temperature of the battery cell (14) is lower than a first preset temperature and the temperature of the heat exchange medium at the outlet end of the motor (17) is lower than the temperature of the heat exchange medium at the inlet end of the heat exchange device (12), the control valve assembly (18) is controlled to be in the second valve position, and the battery heat exchanger (19) is controlled to be in a heating mode and in communication with the first flow channel structure (133); and / or, in a case where it is determined that the body temperature of the battery cell (14) is higher than a second preset temperature and the temperature of the heat exchange medium at the inlet end of the heat exchange device (12) is higher than the temperature of the heat exchange medium at the outlet end of the motor (17), the control valve is controlled to be in the third valve position, and the battery heat exchanger (19) is controlled to be in a cooling mode and in communication with the first flow channel structure (133).

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