Phase change heat management structure for graphene power battery

Abstract

The utility model discloses a phase change heat management structure for a graphene power battery, which belongs to the technical field of power battery heat management and comprises a fixed shell, two heat management mechanisms and a driving motor, heat conduction layers are arranged on the upper surface and the lower surface of the fixed shell, and the two heat management mechanisms are respectively arranged at the top and the bottom of the fixed shell; the heat management mechanism comprises a plurality of phase-change heat conduction pipes and heat conduction plates, the interior of each phase-change heat conduction pipe is divided into at least two phase-change material cavities through partition plates, and the phase-change material cavities are filled with phase-change materials; a plurality of heat conduction through grooves matched with the phase change heat conduction pipes are formed in one side, away from the heat conduction layer, of the heat conduction plate; the output end of the driving motor is provided with a transmission mechanism movably connected with the multiple phase change heat conduction pipes. According to the utility model, the power battery pack can work in a proper temperature range, and the working efficiency of the power battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery thermal management, in particular to a phase change thermal management structure for graphene power batteries. Background Technique

[0002] At present, under the dual pressures of environmental pollution and energy crisis, all countries in the world are vigorously developing new energy electric vehicles. The power battery is one of the core components of electric vehicles. The performance of the power battery will play a decisive role in the performance of electric vehicles such as stability, safety, and environmental adaptability. At present, a large amount of heat is generated during the charging and discharging process of power batteries. When the heat accumulates rapidly, thermal runaway may occur, leading to fires and other situations. In addition, the performance of power batteries will be significantly affected in an environment with too low temperature. Therefore, power batteries need to have a good thermal management system to make the power batteries work within a suitable temperature range, avoid potential safety hazards during the use of power batteries, and work stably and efficiently. However, at present, the thermal management systems of some power batteries can only dissipate heat from the power batteries, ignoring that the performance of power batteries will be significantly reduced in a low-temperature environment, resulting in the inability of power batteries to work stably and efficiently in a low-temperature environment.

[0003] Chinese Patent with publication number CN215418310U discloses a top thermal management power battery, including a battery cell module, a lower box body, a box cover and a cooling plate. The lower box body abuts against the bottom of the battery cell module. The box cover covers the lower box body, and a receiving cavity for accommodating the battery cell module is formed between the box cover and the lower box body. A cooling channel is arranged in the cooling plate, and a cooling circulation device is communicated with the cooling channel and drives a cooling medium to circulate in the cooling channel. The cooling plate is arranged between the battery cell module and the box cover and is attached to the side of the battery cell module away from the lower box body. The above-mentioned top thermal management power battery can make the heat generated by the battery cell module quickly transfer to the outside along the cooling plate by arranging a cooling plate attached to the top of the battery cell module between the box cover and the battery cell module, improving the heat dissipation performance of the power battery. However, it cannot ensure that the power battery maintains a suitable working temperature in a low-temperature environment, resulting in low working efficiency of the power battery in a low-temperature environment. Therefore, there is still room for improvement. Content of the Utility Model

[0004] Aiming at the technical defects in the background technique, the utility model provides a phase change thermal management structure for graphene power batteries, which solves the above technical problems and meets the actual needs. The specific technical solutions are as follows:

[0005] A phase change heat management structure for a graphene power battery, comprising a fixed housing, two heat management mechanisms, and a driving motor. The interior of the fixed housing is hollow to form a power battery chamber. Heat conducting layers are provided on both the upper and lower surfaces of the fixed housing. The two heat management mechanisms are respectively arranged at the top and bottom of the fixed housing.

[0006] Each heat management mechanism includes a number of cylindrical phase change heat conducting tubes and a heat conducting plate fixedly connected to the heat conducting layer. The interior of the phase change heat conducting tube is hollow and is provided with a partition plate. The partition plate is in the same extending direction as the phase change heat conducting tube. The partition plate divides the interior of the phase change heat conducting tube into at least two phase change material chambers, and phase change materials are filled in the phase change material chambers. A number of heat conducting through grooves matching the phase change heat conducting tubes are provided on the side of the heat conducting plate away from the heat conducting layer. A gap allowing the phase change heat conducting tube to rotate is provided between the heat conducting through groove and the phase change heat conducting tube.

[0007] The output end of the driving motor is provided with a transmission mechanism, and the transmission mechanism is movably connected to one axial end of a number of phase change heat conducting tubes.

[0008] As a further technical solution of the present utility model, a number of annular bumps are wound around the surface of the phase change heat conducting tube, and a number of sliding grooves matching the annular bumps are provided in the heat conducting through groove.

[0009] As a further technical solution of the present utility model, a number of annular grooves are provided on the inner wall of the phase change heat conducting tube, and the number of annular grooves are arranged in one-to-one correspondence with the annular bumps.

[0010] As a further technical solution of the present utility model, a temperature detection element is provided in the phase change material chamber.

[0011] As a further technical solution of the present utility model, a number of heat conducting fins are provided on the side of the heat conducting plate away from the heat conducting layer, and the number of heat conducting fins are respectively located between adjacent heat conducting through grooves and at the two ends of the heat conducting plate.

[0012] As a further technical solution of the present utility model, the transmission mechanism includes two sets of transmission gear groups. Each transmission gear group is composed of a number of transmission gears. The number of transmission gears are fixedly connected to a number of phase change heat conducting tubes in the same heat management mechanism one by one, and adjacent transmission gears are meshed with each other.

[0013] As a further technical solution of the present utility model, an air housing is sleeved on the side of the heat management mechanism away from the fixed housing. An air chamber is provided between the air housing and the phase change heat conducting tube. An air inlet and an air outlet penetrating through to the air chamber are respectively provided at two opposite ends of the air housing.

[0014] The beneficial effects of the present utility model are as follows:

[0015] The utility model is used for thermal management of a power battery pack. In the thermal management mechanism, the phase change heat conduction tube absorbs the heat generated by the power battery pack or releases the stored latent heat through the phase change material inside, enabling the power battery pack to operate within a suitable temperature range, improving the working efficiency of the power battery pack and avoiding thermal runaway events. Additionally, when the drive motor operates, the phase change heat conduction tube is rotated through a transmission mechanism, allowing the phase change materials in different phase change material cavities of the phase change heat conduction tube to conduct thermal management on the power battery pack. By filling different performance phase change materials in different phase change material cavities, thermal management of the power battery pack under different working conditions can be achieved, enabling the power battery pack to operate within a suitable temperature range and improving the working efficiency of the power battery pack. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of a phase change thermal management structure for a graphene power battery.

[0017] Figure 2 is a schematic structural diagram of a phase change thermal management structure for a graphene power battery in another direction.

[0018] Figure 3 is an exploded schematic diagram of a phase change thermal management structure for a graphene power battery.

[0019] Figure 4 is a cross-sectional view of a phase change thermal management structure for a graphene power battery.

[0020] Figure 5 is a cross-sectional view of a second embodiment of a phase change thermal management structure for a graphene power battery.

[0021] Wherein: fixed housing 1, power battery cavity 11, heat conduction layer 12, thermal management mechanism 2, phase change heat conduction tube 21, partition plate 211, phase change material cavity 212, annular convex block 213, annular groove 214, temperature detection element 215, heat conduction plate 22, heat conduction through groove 221, sliding groove 222, heat conduction sheet 23, drive motor 3, drive gear 31, transmission mechanism 4, transmission gear 41, air housing 5, air cavity 51, air inlet 52, air outlet 53. Detailed Embodiment

[0022] The following describes the embodiments of the present utility model in conjunction with the accompanying drawings and related embodiments. The embodiments of the present utility model are not limited to the following embodiments, and the relevant necessary components involved in the present utility model should be regarded as well-known technologies in the technical field, which can be known and mastered by those skilled in the technical field.

[0023] Such as Figures 1-4As shown in the figure, a phase change heat management structure for a graphene power battery includes a fixed housing 1, two heat management mechanisms 2, and a drive motor 3. The interior of the fixed housing 1 is hollow to form a power battery chamber 11. Heat conduction layers 12 are provided on both the upper and lower surfaces of the fixed housing 1. The two heat management mechanisms 2 are respectively arranged at the top and bottom of the fixed housing 1. The heat management mechanism 2 includes a number of cylindrical phase change heat conduction tubes 21 and a heat conduction plate 22 fixedly connected to the heat conduction layer 12. The interior of the phase change heat conduction tube 21 is hollow and is provided with a partition plate 211. The partition plate 211 is in the same extending direction as the phase change heat conduction tube 21. The partition plate 211 divides the interior of the phase change heat conduction tube 21 into at least two phase change material chambers 212, and the phase change material chambers 212 are filled with phase change materials. A number of heat conduction through grooves 221 matching the phase change heat conduction tubes 21 are provided on the side of the heat conduction plate 22 away from the heat conduction layer 12. There is a gap allowing the phase change heat conduction tubes 21 to rotate between the heat conduction through grooves 221 and the phase change heat conduction tubes 21. The output end of the drive motor 3 is provided with a transmission mechanism 4, and the transmission mechanism 4 is movably connected to one axial end of a number of phase change heat conduction tubes 21.

[0024] The utility model is used for heat management of the power battery pack of a graphene electric vehicle. Among them, the fixed housing 1 is fixed at positions such as the electric vehicle chassis, which are commonly used for installing the power battery pack, through parts such as bolts. The power battery chamber 11 of the fixed housing 1 is used for installing the power battery pack. A heat conduction layer 12 is formed between the fixed housing 1 and the heat management mechanism 2 by covering a heat conduction film, coating a heat conduction gel, etc., to improve the heat conduction rate of the heat conduction interface and the heat conduction efficiency between the heat management mechanism 2 and the power battery pack, so as to perform heat management on the power battery pack through the heat management mechanism 2. It should be noted that a system for heat management of the battery cells is provided inside the power battery pack. The heat management system can be composed of structures such as liquid cooling pipelines, heat pipes, and pipelines filled with phase change materials. The phase change heat management structure of the utility model can strengthen the heat management effect of the power battery pack, thereby effectively improving the working efficiency of the power battery pack.

[0025] In the thermal management mechanism 2 of the present utility model, at least two phase change material chambers 212 filled with phase change materials are provided inside the phase change heat conduction tube 21. The power battery pack has a relatively high working efficiency when operating in the temperature range of about 15°C to 45°C. The phase change temperature of the phase change material filled in the phase change material chamber 212 is preferably in the range of 15°C to 45°C. The phase change temperature of the phase change material needs to be adaptively adjusted according to data such as the average temperature and the highest temperature in the areas where the electric vehicle often travels, so that the phase change material undergoes a phase change at a more appropriate temperature. The principle of the thermal management mechanism 2 for the power battery pack: The power battery pack exchanges heat with the phase change material through the heat conduction layer 12, the heat conduction plate 22, and the phase change heat conduction tube 21. When the temperature of the power battery pack rises, heat is transferred to the phase change material for absorption. When the temperature of the phase change material rises to the phase change temperature, it will keep the temperature unchanged and continue to absorb and store heat until saturation. When the temperature of the power battery pack drops, the phase change material can release the stored latent heat through a phase change and transfer it to the power battery pack. The phase change material keeps the temperature of the power battery pack within the range of 15°C to 45°C for a long time through its own phase change, enabling the thermal management mechanism 2 to manage the power battery pack and improve the working efficiency of the power battery pack.

[0026] It should be noted that a temperature detection element 215 is provided inside the phase change material chamber 212. The temperature detection element 215 is preferably the probe of a temperature sensor. The temperature detection element 215 can detect the temperature of the phase change material in real time. When the phase change material in one of the phase change material chambers 212 is higher than the phase change temperature, it means that the phase change material has absorbed heat until saturation. At this time, the drive motor 3 can be operated to rotate the phase change heat conduction tube 21 through the transmission mechanism 4, so that the phase change material chamber 212 on the side away from the power battery pack turns towards the power battery pack, and the phase change material in this phase change material chamber 212 continues to absorb the heat generated by the power battery pack. On the contrary, a similar operation can also be adopted when the phase change material releases heat to heat the power battery pack. The phase change materials in at least two phase change material chambers 212 separated by the partition plate 211 cycle to manage the power battery pack thermally. In addition, a lubricating gel with a heat conduction function is filled between the phase change heat conduction tube 21 and the heat conduction groove 221, which improves the heat conduction rate between the heat conduction plate 22 and the phase change heat conduction tube 21 and makes the rotation of the phase change heat conduction tube 21 smoother.

[0027] Furthermore, phase change materials with different properties can be filled in different phase change material cavities 212. For example, by combining a first phase change material with a lower phase change temperature and a second phase change material with a higher phase change temperature, when the power battery pack starts to work, the first phase change material is first used to absorb the heat generated by the power battery pack and keep the power battery pack at a lower working temperature. The first phase change material is mainly used to store heat as latent heat. After the power battery pack stops working, this latent heat can be used as the heat to maintain the temperature of the power battery, so that the power battery pack can be in the high-efficiency working temperature range when it starts to work next time; if the temperature of the first phase change material can maintain the phase change temperature or does not increase significantly during the working process of the power battery pack, it means that the heat dissipation capacity of the thermal management system of the power battery pack itself meets the current working conditions. When the temperature of the first phase change material increases significantly and approaches the phase change temperature of the second phase change material, it means that the heat dissipation capacity of the thermal management system of the power battery pack itself may not meet the current working conditions. At this time, the phase change heat conduction tube 21 is driven to rotate by the drive motor 3 to utilize the second phase change material to absorb the heat of the power battery pack, prevent the temperature of the power battery pack from continuing to rise, keep the temperature of the power battery pack in a suitable range, and the latent heat absorbed by the second phase change material can also be used as a heat source to maintain the power battery pack in the high-efficiency working temperature range when it works next time; thus, it can be seen that through the combination of the above two phase change materials with different phase change temperatures, the thermal management of the power battery pack under different working conditions can be carried out, and the working efficiency of the power battery pack can be improved.

[0028] In summary, the present utility model is used for thermal management of the power battery pack. In the thermal management mechanism 2, the phase change material in the phase change heat conduction tube 21 absorbs the heat generated by the power battery pack or releases the stored latent heat, so that the power battery pack can work within a suitable temperature range, improving the working efficiency of the power battery pack and avoiding thermal runaway events. In addition, when the drive motor 3 operates, the phase change heat conduction tube 21 is rotated through the transmission mechanism 4, so that the phase change materials in different phase change material cavities 212 in the phase change heat conduction tube 21 perform thermal management on the power battery pack. By filling phase change materials with different properties in different phase change material cavities 212, the thermal management of the power battery pack under different working conditions can be realized, enabling the power battery pack to work within a suitable temperature range and improving the working efficiency of the power battery pack.

[0029] As Figures 1-4As shown, as one of the preferred embodiments of the present utility model, a number of annular protrusions 213 are wound around the surface of the phase change heat conduction tube 21, and a number of chutes 222 matching the annular protrusions 213 are provided in the heat conduction through groove 221; the annular protrusions 213 and the chutes 222 can increase the contact area between the phase change heat conduction tube 21 and the heat conduction through groove 221, thereby improving the heat conduction efficiency between the phase change heat conduction tube 21 and the heat conduction through groove 221, and the chutes 222 can enable the above-mentioned lubricating gel with heat conduction function to be better adsorbed in the heat conduction through groove 221, making the phase change heat conduction tube 21 rotate more smoothly.

[0030] As Figure 4 shown, as one of the preferred embodiments of the present utility model, a number of annular grooves 214 are provided on the inner wall of the phase change heat conduction tube 21, and the number of annular grooves 214 are arranged in one-to-one correspondence with the annular protrusions 213; the annular grooves 214 can increase the contact area between the phase change material in the phase change material cavity 212 and the inner wall of the phase change heat conduction tube 21, thereby improving the heat conduction efficiency between the phase change material and the phase change heat conduction tube 21, and enabling the phase change material to absorb or release heat more efficiently.

[0031] As Figures 1-4 shown, as one of the preferred embodiments of the present utility model, a number of heat conduction fins 23 are provided on the side of the heat conduction plate 22 away from the heat conduction layer 12, and the number of heat conduction fins 23 are respectively located between adjacent heat conduction through grooves 221 and at the two ends of the heat conduction plate 22; the heat conduction fins 23 can serve as the heat dissipation fins of the heat conduction plate 22, and the heat conduction fins 23 can increase the contact area between the heat conduction plate 22 and the outside air, and a structure for enhancing air flow can be provided on the side of the heat conduction plate 22 away from the heat conduction layer 12, so that the heat conduction plate 22 can increase the heat dissipation effect through the heat conduction fins 23, and can avoid excessive heat accumulation during the operation of the power battery pack, and avoid the occurrence of thermal runaway events.

[0032] As Figures 1-4 shown, as one of the preferred embodiments of the present utility model, the transmission mechanism 4 includes two sets of transmission gear sets, the transmission gear sets are composed of a number of transmission gears 41, and the number of transmission gears 41 are fixedly connected to a number of phase change heat conduction tubes 21 in the same heat management mechanism 2 one by one, and adjacent transmission gears 41 are meshed with each other; the transmission gear sets are arranged corresponding to the heat management mechanism 2, that is, the transmission gears 41 in the same transmission gear set are fixedly connected to the phase change heat conduction tubes 21 in the same heat management mechanism 2 one by one, and adjacent transmission gears 41 in the same transmission gear set are meshed with each other, and the output end of the driving motor 3 drives the two transmission gear sets to operate simultaneously through a driving gear 31 matching the transmission gear 41, so as to realize the simultaneous rotation of all the phase change heat conduction tubes 21 and change the position of the phase change material in the heat management mechanism 2; it should be noted that the driving gear 31 needs to be meshed with any one of the transmission gears 41 in each transmission gear set to realize the simultaneous driving of the two transmission gear sets to operate.

[0033] AsFigure 5 As shown, as the second preferred embodiment of the present invention, an air housing 5 is sleeved on the side of the heat management mechanism 2 away from the fixed housing 1. An air cavity 51 is provided between the air housing 5 and the phase change heat conduction tube 21. An air inlet 52 and an air outlet 53 penetrating into the air cavity 51 are respectively provided at opposite ends of the air housing 5. The air housing 5 can be communicated with the air conditioning system of the electric vehicle through the air inlet 52. A valve is provided at the air inlet 52. When the heat management mechanism 2 has a large load for dissipating heat from the power battery pack, the valve is opened to divert the cold air generated by the air conditioning system into the air cavity 51. The heat dissipation effect of the heat conduction plate 22 is improved by the heat exchange between the cold air and the heat conduction fins 23. At the same time, the cold air contacts the phase change heat conduction tube 21 and exchanges heat with the phase change material inside, so that the phase change material can absorb more heat. The air that has completed the heat exchange is discharged from the air outlet 53. The air housing 5 of the present invention can improve the heat dissipation effect of the heat management mechanism 2 on the power battery pack by diverting the cold air of the air conditioning system, avoid excessive heat accumulation during the operation of the power battery pack, and avoid thermal runaway events.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A phase change heat management structure for a graphene power battery, comprising a fixed housing (1), two heat management mechanisms (2), and a drive motor (3), characterized in that, The interior of the fixed housing (1) is hollow to form a power battery chamber (11). Heat conduction layers (12) are provided on both the upper surface and the lower surface of the fixed housing (1). Two heat management mechanisms (2) are respectively provided at the top and the bottom of the fixed housing (1). The heat management mechanism (2) includes a number of cylindrical phase change heat conduction tubes (21) and a heat conduction plate (22) fixedly connected to the heat conduction layer (12). The interior of the phase change heat conduction tube (21) is hollow and is provided with a partition plate (211). The partition plate (211) is in the same extending direction as the phase change heat conduction tube (21). The partition plate (211) divides the interior of the phase change heat conduction tube (21) into at least two phase change material chambers (212), and the phase change material chambers (212) are filled with a phase change material. A number of heat conduction through grooves (221) matching the phase change heat conduction tubes (21) are provided on the side of the heat conduction plate (22) away from the heat conduction layer (12). A gap allowing the phase change heat conduction tubes (21) to rotate is provided between the heat conduction through grooves (221) and the phase change heat conduction tubes (21). A transmission mechanism (4) is provided at the output end of the drive motor (3). The transmission mechanism (4) is movably connected to one axial end of a number of phase change heat conduction tubes (21).

2. The phase change heat management structure for a graphene power battery according to claim 1, characterized in that A number of annular bumps (213) are wound around the surface of the phase change heat conduction tube (21). A number of sliding grooves (222) matching the annular bumps (213) are provided in the heat conduction through grooves (221).

3. The phase change heat management structure for a graphene power battery according to claim 2, characterized in that, A number of annular grooves (214) are provided on the inner wall of the phase change heat conduction tube (21). The number of annular grooves (214) and the annular bumps (213) are arranged in one-to-one correspondence.

4. The phase change heat management structure for a graphene power battery according to claim 1, characterized in that, A temperature detection element (215) is provided in the phase change material chamber (212).

5. The phase change heat management structure for a graphene power battery according to claim 1, characterized in that, A number of heat conduction fins (23) are provided on the side of the heat conduction plate (22) away from the heat conduction layer (12). The number of heat conduction fins (23) are respectively located between adjacent heat conduction through grooves (221) and at the two end edges of the heat conduction plate (22).

6. The phase change heat management structure for a graphene power battery according to claim 1, wherein The transmission mechanism (4) includes two sets of transmission gear sets. The transmission gear sets are composed of a number of transmission gears (41). The number of transmission gears (41) are fixedly connected to a number of phase change heat conduction tubes (21) in the same heat management mechanism (2) one by one. Adjacent transmission gears (41) are meshed with each other.

7. The phase change heat management structure for a graphene power battery according to claim 1, characterized in that, An air housing (5) is sleeved on the side of the heat management mechanism (2) away from the fixed housing (1). An air chamber (51) is provided between the air housing (5) and the phase change heat conduction tube (21). An air inlet (52) and an air outlet (53) penetrating into the air chamber (51) are respectively provided at two opposite ends of the air housing (5).

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