Dual-cooling type battery pack of new energy automobile and cooling method

Abstract

The invention discloses a dual-cooling type battery pack of a new energy automobile and a cooling method, and belongs to the technical field of new energy automobile batteries. Comprising a main body and a cover body, the upper layer part of the main body is of a groove structure, a plurality of partition plates are arranged in the groove structure at equal intervals, cavities are formed in the partition plates, the cavities in the partition plates form liquid cooling heat dissipation channels, a battery containing cavity is formed between every two adjacent partition plates, and the cover body is used for sealing the groove structure; the lower layer part of the main body is of a pipe body structure, a plurality of fins are arranged in the pipe body structure at equal intervals, and an air cooling heat dissipation channel is formed between every two adjacent fins; according to the battery pack, cooling liquid in the liquid cooling heat dissipation channel flows in the width direction of the battery pack, cooling air in the air cooling heat dissipation channel flows in the length direction of the battery pack, the cooling liquid and the air cooling heat dissipation channel are perpendicularly crossed in space to dissipate heat of the battery pack, double cooling (liquid cooling and air cooling) of the battery pack is achieved, and the heat dissipation effect of the battery pack is improved.

Description

Technical Field

[0001] The invention relates to a dual-cooling battery pack for new energy vehicles and a cooling method thereof, belonging to the technical field of batteries for new energy vehicles. Background Art

[0002] In recent years, new energy vehicles have achieved rapid development, especially electric vehicles. Electric vehicles are vehicles that are driven by electric motors and the driving electricity comes from an on-board rechargeable energy storage system. Compared with conventional internal combustion engine vehicles, electric vehicles do not produce exhaust gas and there is no exhaust gas pollution, which is very beneficial to environmental protection.

[0003] Batteries are the power source of electric vehicles, and their performance is directly related to the working condition of the vehicle. Batteries generate a lot of heat during the charging and discharging process. If this heat cannot be discharged and released in time, it will directly affect the battery's safety, charging and discharging capacity and efficiency, cycle life and other performance, and thus affect the working performance of the entire vehicle. Moreover, since batteries usually need to be arrayed in groups to meet the needs of automobile use, the consistency of battery pack temperature is also an important guarantee for the normal performance of the battery. If the battery cooling system cannot effectively dissipate the heat in a timely and uniform manner, it will cause inconsistent temperature distribution of the battery pack, which will aggravate the internal resistance and capacity inconsistency of the battery, have a negative impact on the service life, and even bring serious safety hazards.

[0004] In order to prevent battery thermal runaway, electric vehicles currently use battery thermal management technology to ensure the uniform temperature of the battery pack and prevent the occurrence of local high-temperature areas that would cause the battery performance to decay too quickly. As users' expectations for the range of electric vehicles become higher and higher, the energy density of the battery pack (battery pack) also increases, and the heat dissipation increases. The traditional air cooling method can no longer meet the heat dissipation needs of the battery pack, and thus it is transformed into the currently common indirect liquid cooling method. By arranging cooling plates at the bottom or around the battery pack, heat exchange between the battery and the coolant is achieved, which has a certain effect on improving the consistency of the battery pack temperature field. However, due to the limitation of the battery pack energy density, the cooling structure design of the battery pack is subject to certain limitations. How to ensure the structural strength of the battery pack while giving the battery pack a better cooling structure design has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides a dual-cooling battery pack for a new energy vehicle, and also discloses a cooling method for the dual-cooling battery pack for a new energy vehicle.

[0006] The technical solution of the present invention is as follows: Part I A new energy vehicle dual-cooling battery pack comprises a main body and a cover, wherein the width direction of the main body constitutes a first direction, and the length direction of the main body constitutes a second direction; The main body comprises an upper portion and a lower portion; The upper layer of the main body is a groove structure, and a plurality of partitions are arranged at equal intervals inside the groove structure. The partitions extend along a first direction, and there is a cavity inside the partitions. Openings connected to the cavity are formed on the side walls of the main body at both ends of the first direction, and the two openings serve as a liquid inlet and a liquid outlet for the coolant, respectively. The cavity inside the partition constitutes a liquid cooling heat dissipation channel, and the outer side surfaces on both sides of the partition constitute a first heat dissipation surface; a battery accommodating cavity is formed between two adjacent partitions, and the inner bottom of the battery accommodating cavity constitutes a second heat dissipation surface. A battery cell is arranged in the battery accommodating cavity, and the side surface of the battery cell contacts the first heat dissipation surface, and the bottom of the battery cell contacts the second heat dissipation surface; the cover body is used to close the groove structure, and the lead-out terminals of the plurality of battery cells after being electrically connected are arranged on the cover body; The lower layer of the main body is a tube structure, which penetrates the lower layer of the main body along the second direction. A plurality of fins are arranged at equal intervals inside the tube structure, and the fins extend along the second direction, forming an air-cooling heat dissipation channel between two adjacent fins.

[0007] As a preferred embodiment of the present invention, the thickness direction of the main body constitutes a third direction; the main body is provided with a plurality of mounting holes, the mounting holes extending along the third direction, and the cover body is provided with through holes corresponding to the plurality of mounting holes; after the main body and the cover body are combined, they are fixed on the automobile chassis through the mounting holes.

[0008] As a preferred embodiment of the present invention, the flow directions of the coolant in the internal cavities of two adjacent partitions are opposite, so that the heat dissipation effect of the battery unit between the two adjacent partitions is more uniform.

[0009] As a preferred embodiment of the present invention, the liquid inlet and liquid outlet on the side wall of the main body are not on the same horizontal plane, and multiple liquid inlet holes are located on the same horizontal plane, and multiple liquid outlet holes are located on the same horizontal plane; so as to facilitate the arrangement of the coolant circulation pipeline.

[0010] As a preferred embodiment of the present invention, a liquid inlet pipe and a liquid outlet pipe are provided on the side walls of the main body at both ends of the first direction, the liquid inlet pipe is connected to a plurality of liquid inlet holes, the liquid outlet pipe is connected to a plurality of liquid outlet holes, and one end of the liquid inlet pipe and the liquid outlet pipe is connected to an external pipeline.

[0011] As a preferred embodiment of the present invention, an opening and closing mechanism is provided at the front end of the lower layer portion of the main body, and the opening and closing mechanism is used to adjust the air intake volume of the air-cooling heat dissipation channel.

[0012] Furthermore, the opening and closing mechanism includes a shell, the length direction of the shell is consistent with the first direction, and the shell has openings on both sides of the length direction. A rotating shaft is arranged at the front end opening of the shell away from the main body, and the rotating shaft extends along the first direction. A baffle is arranged on the rotating shaft, and a motor for driving the rotating shaft to rotate is arranged at one end of the shell, and the motor controls the rotation angle of the baffle to adjust the size of the front end opening of the shell.

[0013] Furthermore, the rotating shaft is close to the inner top of the shell, and the baffle is an arc-shaped guide plate, one side edge of the arc-shaped guide plate is connected to the rotating shaft, and the outer arc surface of the arc-shaped guide plate faces the outside of the shell, and when the opening and closing mechanism is opened, the motor controls the arc-shaped guide plate to rotate toward the inside of the shell; when the opening and closing mechanism is in the initial closed state, the design of the arc-shaped guide plate has a guiding effect on the air flow to reduce wind resistance.

[0014] Part 2 A cooling method for a dual-cooling battery pack of a new energy vehicle comprises a vehicle body, the dual-cooling battery pack is mounted on the chassis of the vehicle body, and the main body lower layer of the dual-cooling battery pack protrudes from the chassis of the vehicle body, the second direction of the dual-cooling battery pack is consistent with the length direction of the vehicle body, and the opening and closing mechanism faces the front direction of the vehicle body; When the vehicle is running at low speed, the coolant flows in the liquid cooling channel, actively dissipating heat on the sides of the battery unit; at the same time, the opening and closing mechanism is in the initial closed state, the air intake of the air cooling channel is zero, and passive heat is dissipated on the bottom of the battery unit; When the car body is running at high speed, the coolant flows in the liquid-cooling heat dissipation channel, actively dissipating the heat on the side of the battery unit; at the same time, the opening and closing mechanism starts to work, the motor controls the baffle to rotate to the specified position, opens the front opening of the shell, and the air flows through the shell into the air-cooling heat dissipation channel and flows through the air-cooling heat dissipation channel, actively dissipating the heat on the bottom of the battery unit.

[0015] As a preferred embodiment of the method of the present invention, when the vehicle body is running at high speed, the motor is linked with the running speed of the vehicle body, and when the running speed of the vehicle body gradually increases, the rotation angle of the baffle controlled by the motor gradually increases; The speed of the vehicle body traveling at a low speed is less than or equal to 60 km / h, and the speed of the vehicle body traveling at a high speed is greater than 60 km / h.

[0016] The present invention is beneficial in that: (1) The upper layer of the battery pack body of the present invention is a groove structure, and a plurality of partitions are arranged in the groove structure. The partitions can not only serve as ribs of the battery pack to improve the overall structural strength of the battery pack, but also the internal cavity of the partitions can serve as liquid cooling heat dissipation channels for indirect liquid cooling of the battery cells, thereby fully utilizing the internal space of the battery pack and further reducing the external dimensions of the battery pack. (2) The lower layer of the battery pack body of the present invention is a tube structure, and a plurality of fins are arranged in the tube structure. The tube structure and the fins can not only serve as armor protection for the bottom of the battery pack to improve the impact resistance of the bottom of the battery pack, but also serve as an air cooling and heat dissipation channel between two adjacent fins for indirect air cooling and heat dissipation of the battery unit; (3) In the liquid-cooling heat dissipation channel of the battery pack of the present invention, the coolant flows along the width direction of the battery pack, and in the air-cooling heat dissipation channel, the cooling air flows along the length direction of the battery pack. The two cool the battery pack in a vertically cross-shaped manner in space, thereby realizing dual cooling (liquid cooling and air cooling) of the battery pack and improving the cooling and heat dissipation effect of the battery pack. At the same time, the flow directions of the coolant in two adjacent liquid-cooling heat dissipation channels are opposite, so that the cooling and heat dissipation effect of the battery cells between two adjacent partitions is more uniform; (4) The present invention utilizes the natural wind generated by the vehicle during high-speed driving to perform indirect air cooling and heat dissipation on the battery pack, thereby achieving full utilization of natural resources, sharing the working pressure of the liquid cooling system, and reducing the working energy consumption of the liquid cooling system; (5) The present invention is designed with an opening and closing mechanism, which is used to adjust the air intake of the air-cooling heat dissipation channel; when the opening and closing mechanism starts to work, the motor of the opening and closing mechanism is linked with the driving speed of the vehicle. When the driving speed of the vehicle gradually increases, the rotation angle of the baffle controlled by the motor gradually increases, so that the air intake volume increases with the increase of the vehicle speed; (6) The baffle of the opening and closing mechanism of the present invention is designed as an arc-shaped guide plate, and the outer arc surface of the arc-shaped guide plate faces the outside of the shell. When the opening and closing mechanism is opened, the motor controls the arc-shaped guide plate to rotate toward the inside of the shell. When the opening and closing mechanism is in the initial closed state, the design of the arc-shaped guide plate has a guiding effect on the air flow to reduce wind resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the main structure of the present invention; Figure 3 It is a horizontal cross-sectional schematic diagram of the upper layer of the main body of the present invention; Figure 4 It is a cross-sectional schematic diagram of the main body of the present invention in the length direction; Figure 5 It is a cross-sectional schematic diagram of the opening and closing mechanism of the present invention in the initial closed state; Figure 6 It is a cross-sectional schematic diagram of the opening and closing mechanism of the present invention in the open state.

[0018] Meaning of the reference numerals in the figures: 1-main body, 2-cover body, 3-partition plate, 4-liquid inlet hole, 5-liquid outlet hole, 6-liquid cooling channel; 7-battery accommodating cavity, 8-lead-out terminal, 9-mounting hole, 10-through hole, 11-fin; 12- air cooling heat dissipation channel, 14- liquid inlet pipe, 15- liquid outlet pipe; 20 - opening and closing mechanism, 21 - housing, 22 - opening, 23 - rotating shaft, 24 - baffle, 25 - motor. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Embodiment 1

[0021] like Figure 1-6 As shown, this embodiment is a dual-cooling battery pack for new energy vehicles, comprising a main body 1 and a cover 2, wherein the width direction of the main body 1 constitutes a first direction X, and the length direction of the main body 1 constitutes a second direction Y; The main body 1 comprises an upper part and a lower part; The upper layer of the main body 1 is a groove structure, and a plurality of partitions 3 are arranged at equal intervals inside the groove structure. The partitions 3 extend along the first direction X, and the partitions 3 have cavities inside. Openings connected to the cavities are formed on the side walls of the main body 1 at both ends of the first direction X, respectively. The two openings serve as a liquid inlet 4 and a liquid outlet 5 for the coolant, respectively. The internal cavity of the partition 3 constitutes a liquid cooling heat dissipation channel 6, and the outer side surfaces on both sides of the partition 3 constitute a first heat dissipation surface; a battery accommodating cavity 7 is formed between two adjacent partitions 3, and the inner bottom of the battery accommodating cavity 7 constitutes a second heat dissipation surface. A battery cell is arranged in the battery accommodating cavity 7, and the side surface of the battery cell contacts the first heat dissipation surface, and the bottom of the battery cell contacts the second heat dissipation surface; the cover body 2 is used to close the groove structure, and the lead-out terminals 8 after the plurality of battery cells are electrically connected are arranged on the cover body 2; The lower part of the main body 1 is a tubular structure, which penetrates the lower part of the main body 1 along the second direction Y. A plurality of fins 11 are arranged at equal intervals inside the tubular structure. The fins 11 extend along the second direction Y, and an air-cooling heat dissipation channel 12 is formed between two adjacent fins 11.

[0022] In this embodiment, the thickness direction of the main body 1 constitutes a third direction Z; a plurality of mounting holes 9 are provided on the main body 1, and the mounting holes 9 extend along the third direction Z; a through hole 10 corresponding to the plurality of mounting holes 9 is provided on the cover body 2; after the main body 1 and the cover body 2 are combined, they are fixed on the chassis of the automobile through the mounting holes 9; in this embodiment, the number of the mounting holes 9 is six, and the six mounting holes 9 are arranged along the edge of the main body 1. In actual application, the number and position of the mounting holes 9 are set according to actual conditions.

[0023] In this embodiment, the flow directions of the coolant in the internal cavities of two adjacent partitions 3 are opposite, so that the heat dissipation effect of the battery unit between the two adjacent partitions 3 is more uniform; the liquid inlet hole 4 and the liquid outlet hole 5 on the side wall of the main body 1 are not on the same horizontal plane, and multiple liquid inlet holes 4 are located on the same horizontal plane, and multiple liquid outlet holes 5 are located on the same horizontal plane; so as to facilitate the arrangement of the coolant circulation pipeline; a liquid inlet pipe 14 and a liquid outlet pipe 15 are arranged on the side wall of the main body 1 at both ends of the first direction X, the liquid inlet pipe 14 is connected to the multiple liquid inlet holes 4, the liquid outlet pipe 15 is connected to the multiple liquid outlet holes 5, and one end of the liquid inlet pipe 14 and the liquid outlet pipe 15 is connected to the external pipeline, thereby forming a complete coolant circulation loop.

[0024] In this embodiment, the liquid inlet hole 4 and the liquid inlet pipe 14 on the side wall of the right main body 1 are located at the top, and the liquid outlet hole 5 and the liquid outlet pipe 15 are located at the bottom, while the liquid inlet hole 4 and the liquid inlet pipe 14 on the side wall of the left main body 1 are located at the bottom, and the liquid outlet hole 5 and the liquid outlet pipe 15 are located at the top; that is, of the two adjacent liquid cooling heat dissipation channels 6, one liquid cooling heat dissipation channel 6 is top-in and top-out, and the other liquid cooling heat dissipation channel 6 is bottom-in and bottom-out.

[0025] In this embodiment, an opening and closing mechanism 20 is provided at the front end of the lower part of the main body 1, and the opening and closing mechanism 20 is used to adjust the air intake of the air-cooling heat dissipation channel 12; the opening and closing mechanism 20 includes a shell 21, the length direction of the shell 21 is consistent with the first direction X, and both sides of the length direction of the shell 21 have openings 22, and a rotating shaft 23 is provided at the front end opening 22 of the shell 21 away from the main body 1. The rotating shaft 23 extends along the first direction X, and a baffle 24 is provided on the rotating shaft 23. A motor 25 for driving the rotating shaft 23 to rotate is provided at one end of the shell 21. The motor 25 controls the rotation angle of the baffle 24 to adjust the size of the front end opening 22 of the shell 21. The size of the front end opening 22 of the shell 21 is proportional to the air intake of the air-cooling heat dissipation channel 12, that is, the larger the front end opening 22 of the shell 21, the more air intake of the air-cooling heat dissipation channel 12, and the smaller the front end opening 22 of the shell 21, the less air intake of the air-cooling heat dissipation channel 12.

[0026] In this embodiment, the rotating shaft 23 is close to the inner top of the shell 21, and the baffle 24 is an arc-shaped guide plate. One side edge of the arc-shaped guide plate is connected to the rotating shaft 23, and the outer arc surface of the arc-shaped guide plate faces the outside of the shell 21. When the opening and closing mechanism 20 is opened, the motor 25 controls the arc-shaped guide plate to rotate toward the inside of the shell 21; the arc-shaped guide plate is preferably made of rubber material; when the opening and closing mechanism 20 is in the initial closed state, the design of the arc-shaped guide plate has a guiding effect on the air flow to reduce wind resistance.

[0027] Embodiment 2

[0028] refer to Figure 1-Figure 6 This embodiment is a cooling method for a dual-cooling battery pack of a new energy vehicle, comprising a vehicle body, the dual-cooling battery pack described in the first embodiment is installed on the chassis of the vehicle body, and the lower layer of the main body 1 of the dual-cooling battery pack protrudes from the chassis of the vehicle body, the second direction Y of the dual-cooling battery pack is consistent with the length direction of the vehicle body, and the opening and closing mechanism 20 faces the front direction of the vehicle body; When the vehicle body is running at a low speed, the coolant flows in the liquid cooling channel 6 to actively dissipate heat on the side of the battery unit; at the same time, the opening and closing mechanism 20 is in an initial closed state, the air intake of the air cooling channel 12 is zero, and the bottom of the battery unit is passively cooled; When the automobile body is running at high speed, the coolant flows in the liquid-cooling heat dissipation channel 6, actively dissipating the heat on the side of the battery unit; at the same time, the opening and closing mechanism 20 starts to work, and the motor 25 controls the baffle 24 to rotate to a specified position, opening the front end opening 22 of the shell 21, and the air flows through the shell 21 into the air-cooling heat dissipation channel 12, and flows through the air-cooling heat dissipation channel 12, actively dissipating the heat on the bottom of the battery unit.

[0029] In this implementation method, when the vehicle body is traveling at high speed, the motor 25 cooperates with the driving speed of the vehicle body. When the driving speed of the vehicle body gradually increases, the motor 25 controls the rotation angle of the baffle 24 to gradually increase; so that the front end opening 22 of the shell 21 gradually becomes larger as the vehicle speed increases, and the air intake volume also gradually increases.

[0030] In this implementation method, the speed of the car body when traveling at a low speed is less than or equal to 60 km / h, and the speed of the car body when traveling at a high speed is greater than 60 km / h. When the speed of the car body when traveling at a high speed reaches 80 km / h, the motor 25 controls the rotation angle of the baffle 24 to be in the maximum position. At this time, the front end opening 22 of the shell 21 is in the maximum open state.

[0031] The present invention has the following advantages: (1) The upper layer of the battery pack body of the present invention is a groove structure, and a plurality of partitions are arranged in the groove structure. The partitions can not only serve as ribs of the battery pack to improve the overall structural strength of the battery pack, but also the internal cavity of the partitions can serve as liquid cooling heat dissipation channels for indirect liquid cooling of the battery cells, thereby fully utilizing the internal space of the battery pack and further reducing the external dimensions of the battery pack. (2) The lower layer of the battery pack body of the present invention is a tube structure, and a plurality of fins are arranged in the tube structure. The tube structure and the fins can not only serve as armor protection for the bottom of the battery pack to improve the impact resistance of the bottom of the battery pack, but also serve as an air cooling and heat dissipation channel between two adjacent fins for indirect air cooling and heat dissipation of the battery unit; (3) In the liquid-cooling heat dissipation channel of the battery pack of the present invention, the coolant flows along the width direction of the battery pack, and in the air-cooling heat dissipation channel, the cooling air flows along the length direction of the battery pack. The two cool the battery pack in a vertically cross-shaped manner in space, thereby realizing dual cooling (liquid cooling and air cooling) of the battery pack and improving the cooling and heat dissipation effect of the battery pack. At the same time, the flow directions of the coolant in two adjacent liquid-cooling heat dissipation channels are opposite, so that the cooling and heat dissipation effect of the battery cells between two adjacent partitions is more uniform; (4) The present invention utilizes the natural wind generated by the vehicle during high-speed driving to perform indirect air cooling and heat dissipation on the battery pack, thereby achieving full utilization of natural resources, sharing the working pressure of the liquid cooling system, and reducing the working energy consumption of the liquid cooling system; (5) The present invention is designed with an opening and closing mechanism, which is used to adjust the air intake of the air-cooling heat dissipation channel; when the opening and closing mechanism starts to work, the motor of the opening and closing mechanism is linked with the driving speed of the vehicle. When the driving speed of the vehicle gradually increases, the rotation angle of the baffle controlled by the motor gradually increases, so that the air intake volume increases with the increase of the vehicle speed; (6) The baffle of the opening and closing mechanism of the present invention is designed as an arc-shaped guide plate, and the outer arc surface of the arc-shaped guide plate faces the outside of the shell. When the opening and closing mechanism is opened, the motor controls the arc-shaped guide plate to rotate toward the inside of the shell. When the opening and closing mechanism is in the initial closed state, the design of the arc-shaped guide plate has a guiding effect on the air flow to reduce wind resistance.

[0032] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention; in addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that: unless otherwise clearly stipulated and limited, the terms "installation", "connection", "setting" and "forming" should be understood in a broad sense; for example: it can be a fixed connection, setting, or a detachable connection, setting, or an integrated structure; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements; for those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A dual-cooling battery pack for new energy vehicles, characterized in that: It comprises a main body and a cover body, wherein the width direction of the main body constitutes a first direction, and the length direction of the main body constitutes a second direction; The main body comprises an upper portion and a lower portion; The upper layer of the main body is a groove structure, and a plurality of partitions are arranged at equal intervals inside the groove structure. The partitions extend along a first direction, and there is a cavity inside the partitions. Openings connected to the cavity are formed on the side walls of the main body at both ends of the first direction, and the two openings serve as a liquid inlet and a liquid outlet for the coolant, respectively. The cavity inside the partition constitutes a liquid cooling heat dissipation channel, and the outer side surfaces on both sides of the partition constitute a first heat dissipation surface; a battery accommodating cavity is formed between two adjacent partitions, and the inner bottom of the battery accommodating cavity constitutes a second heat dissipation surface. A battery cell is arranged in the battery accommodating cavity, and the side surface of the battery cell contacts the first heat dissipation surface, and the bottom of the battery cell contacts the second heat dissipation surface; the cover body is used to close the groove structure, and the lead-out terminals of the plurality of battery cells after being electrically connected are arranged on the cover body; The lower layer of the main body is a tube structure, which penetrates the lower layer of the main body along the second direction. A plurality of fins are arranged at equal intervals inside the tube structure, and the fins extend along the second direction, forming an air-cooling heat dissipation channel between two adjacent fins.

2. A new energy vehicle dual cooling battery pack according to claim 1, characterized in that: The thickness direction of the main body constitutes a third direction; the main body is provided with a plurality of mounting holes, the mounting holes extending along the third direction, and the cover body is provided with through holes corresponding to the plurality of mounting holes.

3. A new energy vehicle dual cooling battery pack according to claim 1, characterized in that: The flow directions of the coolant in the inner cavities of two adjacent partitions are opposite.

4. A new energy vehicle dual cooling battery pack according to claim 3, characterized in that: The liquid inlet hole and the liquid outlet hole on the side wall of the main body are not on the same horizontal plane, and a plurality of liquid inlet holes are located on the same horizontal plane, and a plurality of liquid outlet holes are located on the same horizontal plane.

5. A new energy vehicle dual cooling battery pack according to claim 4, characterized in that: A liquid inlet pipe and a liquid outlet pipe are arranged on the side walls of the main body at both ends in the first direction. The liquid inlet pipe is connected to a plurality of liquid inlet holes, the liquid outlet pipe is connected to a plurality of liquid outlet holes, and one end of the liquid inlet pipe and the liquid outlet pipe is connected to an external pipeline.

6. A new energy vehicle dual cooling battery pack according to claim 1, characterized in that: An opening and closing mechanism is arranged at the front end of the lower layer part of the main body, and the opening and closing mechanism is used to adjust the air intake volume of the air-cooling heat dissipation channel.

7. A new energy vehicle dual cooling battery pack according to claim 6, characterized in that: The opening and closing mechanism includes a shell, the length direction of the shell is consistent with the first direction, and the shell has openings on both sides of the length direction. A rotating shaft is arranged at the front end opening of the shell away from the main body, and the rotating shaft extends along the first direction. A baffle is arranged on the rotating shaft, and a motor for driving the rotating shaft to rotate is arranged at one end of the shell, and the motor controls the rotation angle of the baffle to adjust the size of the front end opening of the shell.

8. A new energy vehicle dual cooling battery pack according to claim 7, characterized in that: The rotating shaft is close to the inner top of the shell, and the baffle is an arc-shaped guide plate. One side edge of the arc-shaped guide plate is connected to the rotating shaft, and the outer arc surface of the arc-shaped guide plate faces the outside of the shell. When the opening and closing mechanism is opened, the motor controls the arc-shaped guide plate to rotate toward the inside of the shell.

9. A cooling method for a dual-cooled battery pack of a new energy vehicle according to claim 8, comprising a vehicle body, the dual-cooled battery pack is installed on the chassis of the vehicle body, and the main lower layer of the dual-cooled battery pack protrudes from the chassis of the vehicle body, the second direction of the dual-cooled battery pack is consistent with the length direction of the vehicle body, and the opening and closing mechanism is oriented toward the front direction of the vehicle body, characterized in that: When the vehicle is running at low speed, the coolant flows in the liquid cooling channel, actively dissipating heat on the sides of the battery unit; at the same time, the opening and closing mechanism is in the initial closed state, the air intake of the air cooling channel is zero, and passive heat is dissipated on the bottom of the battery unit; When the car body is running at high speed, the coolant flows in the liquid-cooling heat dissipation channel, actively dissipating the heat on the side of the battery unit; at the same time, the opening and closing mechanism starts to work, the motor controls the baffle to rotate to the specified position, opens the front opening of the shell, and the air flows through the shell into the air-cooling heat dissipation channel and flows through the air-cooling heat dissipation channel, actively dissipating the heat on the bottom of the battery unit.

10. A cooling method for a dual-cooling battery pack of a new energy vehicle according to claim 9, characterized in that: When the vehicle body is running at high speed, the motor is linked with the running speed of the vehicle body, and when the running speed of the vehicle body gradually increases, the rotation angle of the baffle controlled by the motor gradually increases; The speed of the automobile body traveling at a low speed is less than or equal to 60 km / h, and the speed of the automobile body traveling at a high speed is greater than 60 km / h.

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