New energy automobile battery pack thermal management system

Abstract

The utility model belongs to the technical field of battery management, and particularly relates to a new energy automobile battery pack heat management system which comprises a shell and a flat plate heat pipe, the shell is used for containing a battery pack of a new energy automobile, a gap is formed between one face of the battery pack and one side in the shell, and an air cavity is formed in the shell in the gap area. The flat heat pipe is arranged in the shell, the side face of one end of the flat heat pipe is attached to the battery pack, and the other end of the flat heat pipe is located in the air cavity; an air cavity is formed in the shell, an air inlet and an air outlet are formed in the shell, both the air inlet and the air outlet communicate with the air cavity and are correspondingly located in the two opposite sides of the air cavity, the air inlet is formed in the front of the driving direction of the new energy automobile, and rotatable fan blades are arranged at the air inlet. According to the utility model, the temperature of the battery pack can be effectively maintained within the optimal working temperature range, and the light-weight development of the new energy automobile is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery management technical field, concretely relates to a new energy automobile battery pack thermal management system. BACKGROUND

[0002] New energy automobile adopts battery pack as all or partial power source. Because of the heat release phenomenon and temperature change in the internal electrochemistry reaction process of battery pack, if the heat generated in the charging and discharging process of battery pack cannot be released to the outside world in time, its temperature will sharply increase because of heat accumulation, thereby having adverse effect on the performance, life and safety of battery pack.

[0003] At present, new energy automobile battery pack thermal management technology mainly has air cooling and hot liquid cooling. The effect of air cooling is influenced by environment to a certain extent, when the environment temperature is higher, only relying on the method of air cooling is insufficient to control the temperature of lithium battery in the best range in short term. At the same time, the temperature difference existing in the battery pack is relatively large by using the method of air cooling, which will influence the performance and service life of lithium battery to a certain extent. Although liquid cooling can bring better heat dissipation effect, the internal structure of lithium battery is easy to change when meeting liquid, the sealing property of cooling system has high requirement, and increases pump, cooling liquid pipeline and other components, the structure is more complex, the volume is larger, and the manufacturing and maintenance cost is improved. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem to provide a new energy automobile battery pack thermal management system which can effectively maintain the temperature of battery pack in the best working temperature interval range, and is more beneficial to the lightweight development of new energy automobile.

[0005] The content of the utility model includes shell and flat plate heat pipe, the shell is used to contain the battery pack of new energy automobile, and there is interval between one side of battery pack and one side in the shell, the interval area forms a wind cavity in the shell, the flat plate heat pipe is arranged in the shell, one end side of flat plate heat pipe is pasted with battery pack, and the other end is located in the wind cavity, the shell is provided with air inlet and air outlet, the air inlet and air outlet are all communicated with wind cavity, and correspondingly located at the opposite sides of wind cavity, the air inlet is arranged to the front of new energy automobile driving direction, and the air inlet is provided with rotatable fan blade.

[0006] Further, the fan blade is rotatably arranged on the air inlet and connected with motor, the motor is reversible motor, and the fan blade can be actively or passively rotated.

[0007] Further, a three-way pipe is further included, one end of the three-way pipe is connected with the air inlet, the other two ends of the three-way pipe respectively form a natural wind inlet pipe and a hot air inlet pipe, the natural wind inlet pipe is arranged towards the front of the new energy vehicle driving direction, and the hot air inlet pipe is connected with the air duct of the air conditioner in the new energy vehicle.

[0008] Further, the flat heat pipe is internally provided with a capillary core structure.

[0009] Further, the natural wind inlet pipe and the hot air inlet pipe are both provided with a switch valve.

[0010] Further, a temperature sensor is further included, the temperature sensor is arranged inside the shell and is used for detecting the temperature of the battery pack.

[0011] Further, the flat heat pipe is internally provided with a capillary core structure.

[0012] Further, the flat heat pipe is internally provided with a capillary core structure.

[0013] Further, the flat heat pipe is internally provided with a capillary core structure.

[0014] Further, the flat heat pipe is internally provided with a capillary core structure.

[0015] The utility model discloses beneficial effect is, along with the travel of new energy automobile, natural wind flows into the wind cavity from the air inlet along the opposite direction of new energy automobile travel direction, and the heat of one end of flat heat pipe in the wind cavity is taken out from the air outlet, thereby the battery pack is heat dissipated. Since flat heat pipe can realize two-dimensional heat transfer, it is helpful to improve battery pack temperature difference, thereby the problem that air heat dissipation uniformity is poor is improved, and the utility model discloses the heat dissipation efficiency and effect of battery pack are better relative to the air cooling of conventional mode, can effectively maintain the temperature of battery pack in the optimum working temperature interval range, and it is favorable to promote the performance of battery pack and prolong its service life. Relative to the mode of liquid cooling heat dissipation, the sealing requirement of battery pack of the utility model is lower, and flat heat pipe and battery pack are directly attached, utilize the high efficient heat transfer of phase change heat transfer, and the overall volume is smaller, on the basis of guaranteeing heat dissipation efficiency and effect, it is more favorable to the lightweight development of new energy automobile. In addition, based on the setting of fan blade, when new energy automobile stops driving, can continue to heat dissipate battery pack through the rotation of fan blade and realize forced convection, guarantee the heat dissipation persistence and effectiveness of battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of the utility model new energy automobile battery pack heat management system.

[0017] Figure 2 It is the schematic diagram of battery pack setting in the inside of shell.

[0018] Figure 3 It is the combined structure schematic diagram of battery pack and flat heat pipe of the utility model.

[0019] Figure 4 It is the A place enlarged view of the utility model. Figure 3

[0020] Figure 5 It is the first local structure schematic diagram of the utility model new energy automobile battery pack heat management system.

[0021] Figure 6 It is the second local structure schematic diagram of the utility model new energy automobile battery pack heat management system.

[0022] In the drawing: 1, shell;11, wind cavity;12, air inlet;13, air outlet;2, blade battery pack;21, blade battery;3, flat heat pipe;4, heat dissipation fin;5, fan blade;6, three-way pipe;61, natural wind inlet pipe;62, hot air inlet pipe;7, switch valve. DETAILED DESCRIPTION

[0023] As​Figures 1-6 As shown in the drawings, the utility model provides a new energy automobile battery pack heat management system, including casing 1 and flat plate heat pipe 3. The casing 1 is used to accommodate the battery pack of new energy automobile, when the battery pack is arranged in the casing 1 inside, one side between the battery pack and the casing 1 inside has interval, and the interval area forms a wind chamber 11 in the casing 1 inside, reference Figure 2 As shown in the drawings, when the battery pack is arranged in the casing 1 inside below, then the battery pack top surface and the casing 1 inside top side have interval, and the interval area forms the wind chamber 11 in the casing 1 inside. The flat plate heat pipe 3 is arranged in the casing 1 inside, and one end side of flat plate heat pipe 3 is attached to the battery pack, and the other end is located in the wind chamber 11. The casing 1 is provided with air inlet 12 and air outlet 13, and the air inlet 12 and air outlet 13 are communicated with the wind chamber 11, and the air inlet 12 is located at one side of the wind chamber 11, and the air outlet 13 is located at the other side of the wind chamber 11, and the side where the air inlet 12 is located is oppositely arranged with the side where the air outlet 13 is located, to ensure that the airflow can completely flow through all areas inside the wind chamber 11 and then flow out from the air outlet 13. And when the utility model is applied to new energy automobile, the whole is installed below the automobile chassis or spare box, and the air inlet 12 and air outlet 13 are communicated with the outside of the automobile, and the air inlet 12 is arranged towards the front of the driving direction of new energy automobile, that is, during the driving process of new energy automobile, the air inlet 12 is always towards the front. The air inlet 12 is provided with rotatable fan blade 5.

[0024] When the utility model is used on new energy automobile, during the driving process of new energy automobile, the battery pack gradually generates heat, and the working medium in the flat plate heat pipe 3 absorbs heat and vaporizes in the end attached to the battery pack, and the vaporized working medium moves to the end of flat plate heat pipe 3 located in the wind chamber 11. Since the air inlet 12 is arranged towards the front of the driving direction of new energy automobile, with the driving of new energy automobile, the natural wind flows into the wind chamber 11 from the air inlet 12 in the opposite direction of the driving direction of new energy automobile, and then flows out from the air outlet 13 after taking away the heat of the end of flat plate heat pipe 3 located in the wind chamber 11, so as to cool the battery pack. The flow direction of natural wind in the wind chamber 11 is shown by the arrow in the figure, and the heat of the end of flat plate heat pipe 3 located in the wind chamber 11 is taken away, and the working medium in the end is liquefied. Figure 1

[0025] ​Since the flat plate heat pipe 3 can realize two-dimensional heat transfer, it helps to improve the temperature difference of the battery pack, thereby improving the problem of poor air cooling uniformity, and the utility model discloses a natural wind opposite to the driving direction during driving is utilized to combine the gas-liquid two-phase circulation of the working medium in the flat plate heat pipe 3 to cool the battery pack, compared with the air cooling of the conventional mode, the heat dissipation efficiency and effect of the battery pack are better, the temperature of the battery pack can be effectively maintained in the optimal working temperature interval range, and the performance of the battery pack is improved and the service life thereof is prolonged.Simultaneously, the flat plate heat pipe 3 is directly attached to the battery pack, and the high efficient heat transfer of phase change heat transfer is utilized, and the overall volume is smaller, which is more conducive to the lightweight development of the new energy vehicle on the basis of guaranteeing the heat dissipation efficiency and effect.

[0026] In addition, based on the setting of the fan blade 5, when the new energy vehicle stops driving, forced convection can be realized by the rotation of the fan blade 5 to continuously cool the battery pack, thereby guaranteeing the heat dissipation continuity and effectiveness of the battery pack.

[0027] The specific shape of the air inlet 12 and the air outlet 13 can be designed according to actual conditions, for example, the shape is circular, oval, square or the like according to different new energy vehicle models, which is not limited herein.

[0028] In the utility model, the fan blade 5 is specifically rotationally arranged on the air inlet 12 and connected with the motor, the motor is a reversible motor, that is, reversible between a motor and a generator, for example, a direct current motor, a permanent magnet motor or other types of reversible motor, the structure, reversible principle and mode switching mode of such reversible motor are prior art, and will not be repeated here. The motor is specifically arranged at the air inlet 12 position through a support, and a space is left on the side of the motor for normal airflow, or the motor is arranged outside the shell 1 and connected with the fan blade 5 through a transmission mechanism penetrating through the shell 1. The motor is electrically connected with the controller and the energy storage module, and the energy storage module is electrically connected with the battery pack.

[0029] Based on the setting of the reversible motor, the fan blade 5 can be actively or passively rotated, when the rotation of the fan blade 5 is needed to realize forced convection, the motor is switched to the motor mode for use, actively runs and drives the fan blade 5 to rotate. During the driving of the new energy vehicle, the motor is switched to the generator mode for use, and the fan blade 5 is passively rotated under the action of the natural wind, thereby driving the motor to generate electricity, and the electric energy is temporarily stored in the energy storage module for subsequent use, for example, charging the battery pack.

[0030] Based on the above setting, while improving the heat dissipation efficiency and effect of the battery pack, a part of kinetic energy of the natural wind can be recovered during driving, which is converted into electric energy, the function of the heat management system is expanded, a certain amount of additional electric energy is provided for the new energy vehicle during driving, and the endurance of the new energy vehicle is improved.

[0031] Preferably, the utility model still includes three -way pipe 6, the material of this three -way pipe 6 can be copper or other. Figure 1 As shown, one end of the three -way pipe 6 is connected with the air inlet 12, and the other two ends of the three -way pipe 6 form natural wind inlet pipe 61 and hot air inlet pipe 62 respectively. The natural wind inlet pipe 61 is arranged towards the front of the new energy vehicle driving direction, and the hot air inlet pipe 62 is connected with the air duct of the air conditioner in the new energy vehicle. During the driving of the new energy vehicle, the natural wind flows along the natural wind inlet pipe 61 to the inside of the air cavity 11. Based on the setting of the three -way pipe 6, when the environmental temperature is too low, for example, in winter, the hot air mode is generally used for the air conditioner in the vehicle, and part of the hot air can enter the air cavity 11 through the hot air inlet pipe 62. The heat carried by the hot air is uniformly transmitted to the battery pack through the flat heat pipe 3, so that the temperature of the battery pack can be raised when the temperature of the battery pack is too low, and the temperature of the battery pack is raised to the optimal working temperature, thereby improving the operating performance of the battery pack. Among them, the flow direction of the hot air in the air cavity 11 is the same as that of the natural wind in the air cavity 11.

[0032] Since in the mode of using hot air, the evaporation end and the condensation end of the flat heat pipe 3 are exchanged, and the inside of the flat heat pipe 3 is preferably a capillary core structure, the internal working medium can continuously circulate in gas-liquid two-phase under the action of capillary force, thereby ensuring the effectiveness and uniformity of the temperature raising of the battery pack.

[0033] Switch valves 7 are arranged on the natural wind inlet pipe 61 and the hot air inlet pipe 62, which are used to control the opening and closing of the natural wind inlet pipe and the hot air inlet pipe 62, and ensure the independence of each inlet pipe in the corresponding mode. The two switch valves 7 are electrically connected with the controller and work coordinately through the controller.

[0034] The utility model also includes a temperature sensor, which is arranged inside the shell 1 and is used to detect the temperature of the battery pack. The temperature sensor is electrically connected with the controller and is used to feedback the temperature of the battery pack in real time. It is preset that when the temperature feedback by the temperature sensor is lower than a certain value, the switch valve 7 on the hot air inlet pipe 62 is opened, and the switch valve 7 on the natural wind inlet pipe 61 is closed. It is also preset that when the temperature feedback by the temperature sensor is higher than a certain value, the switch valve 7 on the hot air inlet pipe 62 is closed, and the switch valve 7 on the natural wind inlet pipe 61 is opened. Among them, when the utility model uses the hot air mode, that is, when the switch valve 7 on the hot air inlet pipe 62 is in the open state, the motor connected with the fan blade 5 is switched to the motor mode, and the whole forms an air blower to drive the hot air to flow into the air cavity 11.

[0035] In the utility model, the one end side of flat plate heat pipe 3 located in air cavity 11 is provided with radiating fin 4. Based on the setting of radiating fin 4, the contact area with airflow can be increased, which is not only beneficial to promote the heat dissipation rate, but also can play the role of protecting flat plate heat pipe 3. Further preferably, the radiating fin 4 is spaced apart along the side of flat plate heat pipe 3, and the direction of the spacing is the connecting direction between the two ends of flat plate heat pipe 3, and the interval between the fins is used for normal airflow.

[0036] In an embodiment of the utility model, the battery pack is blade battery pack 2, and blade battery pack 2 is composed of a plurality of spaced apart blade batteries 21. The flat plate heat pipe 3 is provided with a plurality of flat plate heat pipes 3, and the plurality of flat plate heat pipes 3 are staggered with a plurality of blade batteries 21 in blade battery pack 2, and the direction of the staggered arrangement is crossed with the connecting direction between air inlet 12 and air outlet 13. Referring to the specific reference Figure 3 , the connecting direction between air inlet 12 and air outlet 13 is the flow direction of natural wind in air cavity 11, that is, the X direction in Figure 3 , and the direction of the plurality of flat plate heat pipes 3 and the plurality of blade batteries 21 is the Y direction in Figure 3 . One end of the plurality of flat plate heat pipes 3 is attached to the two blade batteries 21 adjacent to itself, which guarantees the heat dissipation effectiveness of each blade battery 21. The other end of the plurality of flat plate heat pipes 3 is located in air cavity 11, and the radiating fin 4 on the side of the plurality of flat plate heat pipes 3 is located between the sides of the adjacent flat plate heat pipes 3, that is, as shown in Figure 4 .

[0037] In the utility model, preferably, the two adjacent flat plate heat pipes 3 are connected to each other between the one end sides in air cavity 11, which guarantees the stability between the flat plate heat pipes 3 and improves the structural strength. The adjacent flat plate heat pipes 3 are connected by a connecting plate, and the connecting plate is located at the top of blade battery 21, and / or the adjacent flat plate heat pipes 3 are connected by radiating fin 4.

[0038] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to suggest that the scope of protection of the present application is limited to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of one or more embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0039] It is intended that the embodiments of the application herein disclosed meet all the written requirements of the patent statutes and come within the judicial doctrines of equivalents and will not be construed to be limited to the embodiments shown and described and by the keeping within the spirit and scope of the embodiments of the application.

Claims

1. A new energy vehicle battery pack thermal management system, characterized in that, The application relates to a heat dissipation device for a new energy vehicle, which comprises a shell (1) for accommodating a battery pack of the new energy vehicle, and a gap is formed between one side of the battery pack and one side of the shell (1) inside the shell (1), so that a wind cavity (11) is formed in the shell (1); a flat heat pipe (3) is arranged in the shell (1), one side of the flat heat pipe (3) is attached to the battery pack, and the other side of the flat heat pipe (3) is located in the wind cavity (11); an air inlet (12) and an air outlet (13) are arranged on the shell (1) and communicate with the wind cavity (11) and are located at opposite sides of the wind cavity (11); the air inlet (12) is arranged in front of the driving direction of the new energy vehicle, and the air inlet (12) is provided with rotatable fan blades (5).

2. The new energy vehicle battery pack thermal management system of claim 1, wherein, The fan blades (5) are rotatably arranged on the air inlet (12) and are connected with a motor; the motor is a reversible motor; and the fan blades (5) can be actively or passively rotated.

3. The new energy vehicle battery pack thermal management system of claim 1 or 2, characterized in that, The device further comprises a three-way pipe (6), one end of the three-way pipe (6) is connected with the air inlet (12), and the other two ends of the three-way pipe (6) form a natural air inlet pipe (61) and a hot air inlet pipe (62) respectively; the natural air inlet pipe (61) is arranged in front of the driving direction of the new energy vehicle; and the hot air inlet pipe (62) is connected with an air duct of an air conditioner in the new energy vehicle.

4. The new energy vehicle battery pack thermal management system of claim 3, wherein, The flat heat pipe (3) is internally provided with a capillary core structure.

5. The new energy vehicle battery pack thermal management system of claim 3, wherein, Switch valves (7) are arranged on the natural air inlet pipe (61) and the hot air inlet pipe (62).

6. The new energy vehicle battery pack thermal management system of claim 5, wherein, The device further comprises a temperature sensor arranged in the shell (1) and used for detecting the temperature of the battery pack.

7. The new energy vehicle battery pack thermal management system of any one of claims 1, 2, 4-6, wherein, The side of one end of the flat heat pipe (3) located in the wind cavity (11) is provided with heat dissipation fins (4).

8. The new energy vehicle battery pack thermal management system of claim 7, wherein, The heat dissipation fins (4) are arranged at intervals along the side of the flat heat pipe (3) and are arranged in the direction connecting the two ends of the flat heat pipe (3).

9. The new energy vehicle battery pack thermal management system of claim 8, wherein, The battery pack is a blade battery pack (2), and a plurality of flat heat pipes (3) are arranged; the plurality of flat heat pipes (3) are arranged in a staggered mode with a plurality of blade batteries (21) in the blade battery pack (2), and the direction of the staggered mode is perpendicular to the direction of the line connecting the air inlet (12) and the air outlet (13); one end of the plurality of flat heat pipes (3) is attached to two adjacent blade batteries (21), and the heat dissipation fins (4) on the side of the plurality of flat heat pipes (3) are located between the sides of the adjacent flat heat pipes (3).

10. The new energy vehicle battery pack thermal management system of claim 9, wherein, The sides of one end of the adjacent two flat heat pipes (3) located in the wind cavity (11) are connected with each other.

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