Graphene battery pack

Abstract

The graphene battery pack comprises a shell, a plurality of battery units and a circulating fan, the shell comprises a bottom plate, an enclosure frame and a cover plate provided with a heat dissipation part, the bottom plate is provided with a mounting groove with an air guide groove in the peripheral wall, the air guide groove is connected with a limiting plate in an inserted mode, and the upper end of the limiting plate is connected with a limiting plate of the cover plate in an inserted mode; a flow guide hole communicated with the air guide groove and penetrating through the top face of the limiting plate is formed in the limiting plate, a heat dissipation cavity communicated with the flow guide hole is formed in the cover plate, an air return opening is formed in the upper end of the shell, an inlet of the circulating fan is communicated with the heat dissipation cavity, and an outlet of the circulating fan is in butt joint with the air return opening. The graphene battery pack has the advantages that heat dissipation of the side faces of the battery units can be completed, the heat dissipation capacity of the graphene battery pack is guaranteed, the limiting plates can also support the graphene battery pack, the strength of the graphene battery pack is improved, and flow guide holes are formed in the limiting plates, namely, the limiting plates are of internal hollow structures; and the limiting plates can be elastically compressed inwards during thermal expansion of the battery units, so that the structural strength of the graphene battery pack is flexibly enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene battery packs, and in particular to a graphene battery pack. Background Art

[0002] Graphene battery packs are increasingly being used, but graphene battery packs are not easy to dissipate heat, which leads to overheating when used in high temperature environments. As the temperature gradually rises, the discharge performance of the battery pack will be affected by over-discharge and electrode polarization, which will reduce the battery capacity and affect the charge and discharge performance of the battery pack. In addition, since the thermal expansion coefficient of graphene battery packs is higher than that of ordinary battery packs, they are prone to deformation or cracking when the temperature changes.

[0003] In the Chinese patent literature, the publication number CN116315283 A disclosed a graphene battery pack thermal management device on June 23, 2023, which adjusts the number of heat dissipation ports opened by a sliding mechanism to control the heat dissipation efficiency. However, its actual structure is complex and the heat dissipation efficiency is high. Summary of the invention

[0004] The present invention provides a graphene battery pack with changeable heat dissipation effect, which solves the problem of poor heat dissipation effect of existing graphene batteries.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a graphene battery pack, comprising an outer shell and a battery pack body arranged in the outer shell, the battery pack body comprising a plurality of battery cells, characterized in that it also comprises a circulating fan, the outer shell comprises a bottom plate, a surrounding frame surrounding the edge of the bottom plate and a cover plate connected to the surrounding frame, the bottom plate is provided with a plurality of mounting grooves for positioning the battery cells, the surrounding walls of the mounting grooves are provided with air guide grooves, the edges of the mounting grooves are provided with limit plates plugged into the air guide grooves, the limit plates are provided with guide holes that pass through the top surface of the limit plates and are connected to the air guide grooves, the limit plates are plugged into the cover plates, the cover plates are provided with a heat dissipation cavity that is connected to the guide holes, a heat dissipation portion is provided on the outside of the cover plates, a return air outlet is provided at the upper end of the outer shell, the inlet of the circulating fan is connected to the heat dissipation cavity, and the outlet is connected to the return air outlet. During use, if the temperature of the battery cell exceeds the requirement, the circulating fan is started, so that the gas in the shell passes through the air guide groove, the guide hole, the heat dissipation cavity, the circulating fan and the return air port and enters the circulation of the outer pit. When the airflow passes through the heat dissipation cavity, it is dissipated under the action of the heat dissipation part, thereby realizing the heat dissipation of the battery cell. The structure is compact and the heat dissipation effect is good. The shell of the present application positions the bottom of the battery cell through the installation groove, and realizes the heat dissipation of the bottom of the battery cell through the air guide groove. The air guide groove is connected to the limit plate, and the guide hole in the limit plate is connected to the air guide groove to complete the heat dissipation of the side of the battery cell, ensuring the heat dissipation capacity of the graphene battery pack. The limit plate can also support the graphene battery pack and improve the strength of the graphene battery pack. Since the guide hole is set in the limit plate, that is, it is an internal hollow structure, the limit plate can be elastically compressed inward when the battery cell expands thermally, realizing the flexible enhancement of the structural strength of the graphene battery pack. The heat derived from the guide hole is collected in the heat dissipation cavity, and the heat is dissipated through the heat dissipation part to ensure the overall heat dissipation efficiency of the graphene battery pack. The airflow is recycled to prevent external unclean air from entering and contaminating the battery cells, thereby affecting the heat dissipation effect.

[0006] Preferably, a plurality of heat dissipation fins are provided on the upper side of the heat dissipation cavity, so as to improve the heat exchange between the hot air flow inside the heat dissipation cavity and the upper side of the heat dissipation cavity, and ensure the reliable heat dissipation effect of the heat dissipation part.

[0007] Preferably, the heat dissipation part is a heat dissipation water channel. When in use, condensed water passes through the heat dissipation part to exchange heat with the airflow passing through the heat dissipation cavity, which can increase the heat exchange effect.

[0008] Preferably, after the cover plate and the surrounding frame are connected, the cover plate and the bottom plate press the limit plate, and the upper end surface of the limit plate is provided with an upper through groove connected to the guide hole, and the lower end surface is provided with a lower through groove connected to the guide hole; when the cover plate and the bottom plate press the limit plate, the lower through groove connects the guide hole and the air guide groove, and the lower through groove connects the guide hole and the heat dissipation cavity. It can improve the fixing reliability of the limit plate without affecting the airflow circulation during heat dissipation. The graphene battery pack has high structural integrity.

[0009] Preferably, there are several rows of limit plates, and the limit plates in the same row are spaced apart. Two adjacent rows of limit plates abut against two sides of the same battery. The limit plates are provided with vertically extending vertical wind grooves and laterally extending transverse wind grooves. The lower ends of the vertical wind grooves are connected with the air guide grooves. The battery is disconnected from the side wall of the outer shell on which the return air outlet is provided, and the transverse wind grooves are through grooves. It can ensure reliable heat dissipation and reliable support and fixation of the battery unit. It can ensure tight support for the battery unit and reliability of ventilation and heat dissipation. The limit plates can achieve flexible support for the battery unit and reliable heat conduction on the sides of the battery unit.

[0010] Preferably, a first temperature sensor is provided at the lower side of the heat dissipation cavity, and a second temperature sensor is provided at the return air outlet. The first temperature sensor and the second temperature sensor can monitor the temperature in real time, and the circulating fan, as a heat dissipation device automatically controlled according to the feedback signal of the temperature sensor, can realize precise control of the heat dissipation of the battery pack.

[0011] Preferably, a lower through groove connecting the guide hole and the air guide groove is provided on the lower end surface of the limit plate, a sealing plate closing the lower through groove and a spring driving the sealing plate to close the lower through groove are provided in the limit plate, a piston cylinder is provided in the air guide groove, a piston is connected in a sliding seal in the piston cylinder, the piston isolates a sealed chamber filled with gas in the piston cylinder, and the piston is connected to a push rod driving the sealing plate; when the temperature in the shell reaches the set value, the expansion of the gas in the sealed chamber moves toward the sealing plate through the piston driving the push rod to push the sealing plate open, and an induction switch is provided in the limit plate, and the circulating fan starts when the induction switch senses that the sealing plate is open. A technical solution is provided to enable the cooling circuit to automatically open and act as a circulating fan after knowing that the temperature in the shell reaches the set requirement.

[0012] Preferably, the sealing plate is slidably connected to the bottom plate, a positioning plate located in the guide hole is penetrated on the bottom plate, one end of the spring is connected to the positioning plate, and the other end is connected to the sealing plate, and the spring is a compression spring. The sealing plate is reliable when opening and closing the loop. The assembly is convenient when the invention is made, and the positioning plate and the sealing plate are first plugged in, and then the limit plate is inserted.

[0013] Preferably, the mounting grooves on both sides of the limiting plate are symmetrically distributed on both sides of the limiting plate, the mounting groove between the two limiting plates is provided with two air guide grooves correspondingly connected to the air guide holes of the two limiting plates, and the springs of the two lower through grooves on the same limiting plate are supported on the same positioning plate. The structure is compact.

[0014] Preferably, the shell and the piston cylinder are both made of heat-conducting materials, which can increase the heat dissipation efficiency and the response speed when sensing temperature.

[0015] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the connection between the bottom plate and the limiting plate of the first embodiment of the present invention; Figure 2 is a schematic diagram of Embodiment 1 of the present invention; Figure 3 yes Figure 2 A local enlarged schematic diagram of point A; Figure 4 is a schematic diagram of Embodiment 2; Figure 5 yes Figure 4 A local enlarged schematic diagram of point B; Figure 6 yes Figure 5 A local enlarged schematic diagram of point C.

[0017] In the figure: battery unit 1, bottom plate 2, mounting groove 3, return air port 4, lower through groove 5, air guide groove 6, limit plate 7, guide hole 8, upper through groove 9, frame 10, cover plate 11, heat dissipation cavity 12, heat dissipation fins 13, heat dissipation water channel 14, first temperature sensor 15, circulating fan 16, second temperature sensor 17, vertical air groove 18, sealing plate 19, spring 20, piston cylinder 21, piston 22, sealing cavity 23, positioning plate 24, horizontal air groove 25, and ejector rod 26. DETAILED DESCRIPTION

[0018] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0019] In the description of this embodiment, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, cannot be understood as limiting the present invention. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] Embodiment 1, Figures 1 to 3A graphene battery pack comprises a shell and a battery pack body arranged in the shell, the battery pack body comprises a plurality of battery cells 1, the shell comprises a bottom plate 2, a plurality of mounting grooves 3 for positioning the battery cells 1 are arranged on the bottom plate 2, a wind guide groove 6 is arranged on the peripheral wall of the mounting groove 3, a limiting plate 7 plugged into the wind guide groove 6 is arranged on the edge of the mounting groove 3, and a guide hole 8 connected to the wind guide groove 6 is arranged in the limiting plate 7. A return air port 4 is arranged at the upper end of the shell. There are three rows of limiting plates, and there are five limiting plates 7 in the same row of limiting plates. The limiting plates in the same row are spaced apart, and two adjacent rows of limiting plates abut against two side surfaces of the same battery cell 1. The mounting grooves on both sides of the limiting plates are symmetrically distributed on both sides of the limiting plates, and the mounting groove between the two limiting plates is provided with two wind guide grooves connected to the guide holes of the two limiting plates in a one-to-one correspondence. The outer pit is a heat-conducting structure.

[0021] The air guide groove 6 of the present application cooperates with the guide hole 8 to enhance the heat dissipation capacity of the side of the battery cell 1. The bottom plate 2 positions the battery cell 1 by setting the mounting groove 3. The limit plate 7 is plugged into the air guide groove 6, and the limit plate 7 corresponds to between the battery cells 1, which can support the battery cell 1 and improve the setting strength of the battery cell 1. At the same time, because the guide hole 8 is set in the limit plate 7, the limit plate 7 has an internal hollow structure. When the graphene battery pack expands thermally, the limit plate 7 can provide elastic space to complete the avoidance. The outer shell is made of a material with a high thermal conductivity coefficient. Such as aluminum alloy, magnesium alloy, etc. The structural strength is high, and at the same time, it can facilitate the heat dissipation of the graphene battery pack. In this embodiment, the cross-sectional shape of the guide hole 8 is an ellipse whose length corresponds to the lateral length of the guide plate. Those skilled in the art can understand that the guide hole 8 can also be other shapes.

[0022] like Figure 2 As shown, the outer shell includes a frame 10 surrounding the edge of the bottom plate 2, and the frame 10 is connected to a cover plate 11, the cover plate 11 is plugged with the limit plate 7, and a heat dissipation cavity 12 connected to the guide hole 8 is provided in the cover plate 11, and a heat dissipation portion is provided on the outside of the cover plate 11. The heat derived from the guide hole 8 is collected in the heat dissipation cavity 12, and the heat is dissipated through the heat dissipation portion to ensure the overall heat dissipation efficiency of the graphene battery pack. The heat dissipation cavity 12 can gather the heat generated by the entire graphene battery pack, and can quickly dissipate the heat of the graphene battery pack in conjunction with the heat dissipation portion. Furthermore, in order to improve the heat exchange efficiency inside the heat dissipation cavity 12, a plurality of heat dissipation fins 13 are provided on the upper side of the heat dissipation cavity 12. Those skilled in the art can understand that the heat dissipation fins 13 can be replaced by heat dissipation structures such as grooves and convex plates that increase the heat exchange area.

[0023] The heat dissipation part is a heat dissipation water channel 14. The heat dissipation water channel 14 includes a water inlet and a water outlet. The heat dissipation water channel 14 is connected to a water pump to realize water circulation and complete the water cooling of the heat dissipation cavity 12. The heat dissipation cavity 12 is located in the cover plate 11, and the heat dissipation water channel 14 is fixedly connected to the upper side of the cover plate 11. The heat dissipation water channel 14 is arranged in close contact with the cover plate 11. As a simple replacement of the above solution, the heat dissipation part can also be a heat dissipation air channel, contact with a refrigerant, or other methods.

[0024] After the cover plate 11 is connected to the frame 10, the cover plate 11 and the bottom plate 2 press the limit plate 7. Furthermore, an upper through groove 9 connected to the guide hole 8 is provided on the upper end surface of the limit plate 7, so that when the cover plate 11 and the bottom plate 2 press the limit plate 7, the guide hole 8 in the limit plate 7 remains connected with the air guide groove 6 and the heat dissipation cavity 12. The limit plate 7 is used to separate adjacent battery cells 1, and the limit plate 7 is arranged in a close fit with the battery cell 1. The air guide groove 6 is connected to the root of two adjacent battery cells 1. The overall structure of the graphene battery pack formed by the above scheme is highly correlated and is uniformly pressed and fixed by the cover plate 11. After removing the cover plate 11, the battery cell 1 and the limit plate 7 can be easily taken out, so as to facilitate the replacement of the battery cell 1 or the limit plate 7. A lower through groove 5 connected to the guide hole is provided on the lower end surface of the limit plate; when the cover plate and the bottom plate press the limit plate, the lower through groove connects the guide hole and the air guide groove.

[0025] like Figure 2 and Figure 3 As shown, a first temperature sensor 15 is provided at the lower side of the heat dissipation cavity 12, and a circulating fan 16 is connected to the heat dissipation cavity 12, and the heat dissipation cavity 12 is connected to the inlet end of the circulating fan 16. A second temperature sensor 17 is provided at the return air port, and the circulating fan 16 is an air pump or a fan. The first temperature sensor 15 and the second temperature sensor 17 can monitor the temperature in real time, and the circulating fan 16, as a heat dissipation device automatically controlled according to the feedback signal of the temperature sensor, can realize the precise control of the heat dissipation of the battery pack. The first temperature sensor 15 is located at the lower side of the heat dissipation cavity 12, and is used to detect the temperature of the graphene battery pack. When the detection temperatures of the first temperature sensor 15 and the second temperature sensor 17 both reach the response temperature, the heat dissipation water channel 14 and the circulating fan 16 are started; when the detection temperature of the first temperature sensor 15 reaches the response temperature and the second temperature sensor 17 is lower than the response temperature, only the circulating fan 16 is started; when the detection temperature of the first temperature sensor 15 and the detection temperature of the second temperature sensor 17 are both lower than the response dimension, the circulating fan 16 and the heat dissipation water channel 14 can be closed. The response temperature can be set independently based on laboratory data.

[0026] A first temperature sensor 15 is provided at the upper through groove 9 of the limiting plate 7, which can detect the temperature of the air flowing out of the guide hole 8 of each limiting plate 7. In this scheme, each limiting plate 7 is detected. If the temperature of a certain limiting plate 7 cannot be reduced, it is preliminarily determined that the graphene battery cell 1 has excessive thermal expansion, resulting in the squeezing of the guide hole 8 in the limiting plate 7. At this time, the graphene battery should be stopped from use, and the battery cell 1 should be left to cool for a period of time to complete the overall heat dissipation of the graphene battery pack before it can be used again. Alternatively, the limiting plate 7 and the battery cell 1 can be replaced to achieve precise maintenance at a fixed point.

[0027] Embodiment 2 is different from Embodiment 1 in that: See also Figures 4 to 6 , the limit plate is provided with a vertical wind slot 18 extending vertically and a horizontal wind slot 25 extending horizontally, the lower end of the vertical wind slot is connected to the air guide slot, the battery is disconnected from the side wall of the shell on the side where the return air port is provided, and the horizontal wind slot is a through slot. The limit plate is provided with a sealing plate 19 that closes the lower through slot and a spring 20 that drives the sealing plate to close the lower through slot, the air guide slot is provided with a piston cylinder 21, the piston cylinder is connected with a piston 22 in a sliding seal, the piston isolates a sealed chamber 23 filled with gas in the piston cylinder, and the piston is connected with a push rod 26 that drives the sealing plate; when the temperature in the shell reaches the set value, the expansion of the gas in the sealed chamber is driven by the piston to move the push rod toward the sealing plate to push the sealing plate open, and the limit plate is provided with an induction switch, and the circulating fan starts when the induction switch senses that the sealing plate is opened. The sealing plate is slidably connected to the bottom plate, and a positioning plate 24 located in the guide hole is penetrated on the bottom plate, one end of the spring is connected to the positioning plate, and the other end is connected to the sealing plate, and the spring is a compression spring. The springs of the two lower through slots on the same limit plate are supported on the same positioning plate. The piston cylinders are made of heat-conducting materials. This can increase the heat dissipation efficiency and the response speed when sensing temperature. The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A graphene battery pack, comprising a housing and a battery pack body disposed in the housing, wherein the battery pack body comprises a plurality of battery cells, wherein: It also includes a circulating fan, the shell includes a bottom plate, a surrounding frame surrounding the edge of the bottom plate and a cover plate connected to the surrounding frame, the bottom plate is provided with a plurality of mounting grooves for positioning the battery cells, the surrounding walls of the mounting grooves are provided with air guide grooves, the edges of the mounting grooves are provided with limiting plates plugged with the air guide grooves, the limiting plate is provided with guide holes connected to the air guide grooves and passing through the top surface of the limiting plate, the limiting plate is plugged into the cover plate, the cover plate is provided with a heat dissipation cavity connected to the guide holes, a heat dissipation portion is provided on the outside of the cover plate, a return air outlet is provided at the upper end of the shell, the inlet of the circulating fan is connected to the heat dissipation cavity, and the outlet is connected to the return air outlet.

2. A graphene battery pack according to claim 1, characterized in that: A plurality of heat dissipation fins are arranged on the upper side of the heat dissipation cavity.

3. A graphene battery pack according to claim 1 or 2, characterized in that: The heat dissipation part is a heat dissipation water channel.

4. A graphene battery pack according to claim 1 or 2, characterized in that: After the cover plate and the surrounding frame are connected, the cover plate and the bottom plate press the limit plate, and an upper through groove connected to the guide hole is provided on the upper end surface of the limit plate, and a lower through groove connected to the guide hole is provided on the lower end surface; when the cover plate and the bottom plate press the limit plate, the lower through groove connects the guide hole and the wind guide groove, and the lower through groove connects the guide hole and the heat dissipation cavity.

5. A graphene battery pack according to claim 1 or 2, characterized in that: There are several rows of limit plates, and the limit plates in the same row are spaced apart. The limit plates in two adjacent rows are in contact with two side surfaces of the same battery. The limit plates are provided with vertical wind grooves extending vertically and horizontal wind grooves extending horizontally. The lower ends of the vertical wind grooves are connected with the air guide grooves. The battery is disconnected from the side wall of the outer shell on which the return air outlet is provided, and the horizontal wind groove is a through groove.

6. A graphene battery pack according to claim 1 or 2, characterized in that: A first temperature sensor is disposed on the lower side of the heat dissipation cavity, and a second temperature sensor is disposed on the return air outlet.

7. A graphene battery pack according to claim 1 or 2, characterized in that: A lower through groove connecting the guide hole and the air guide groove is provided on the lower end surface of the limit plate. A sealing plate for closing the lower through groove and a spring for driving the sealing plate to close the lower through groove are provided in the limit plate. A piston cylinder is provided in the air guide groove. A piston is connected to the piston cylinder in a sliding seal. The piston isolates a sealed chamber filled with gas in the piston cylinder. The piston is connected to a push rod that drives the sealing plate. When the temperature in the shell reaches a set value, the expansion of the gas in the sealed chamber drives the push rod to move toward the sealing plate through the piston to push the sealing plate open. An induction switch is provided in the limit plate. When the induction switch senses that the sealing plate is open, the circulating fan starts.

8. A graphene battery pack according to claim 7, characterized in that: The sealing plate is slidably connected to the bottom plate, a positioning plate located in the guide hole is penetrated through the bottom plate, one end of the spring is connected to the positioning plate, and the other end is connected to the sealing plate, and the spring is a compression spring.

9. A graphene battery pack according to claim 8, characterized in that: The mounting grooves on both sides of the limit plate are symmetrically distributed on both sides of the limit plate. The mounting groove between the two limit plates is provided with two air guide grooves which are connected to the air guide holes of the two limit plates in a one-to-one correspondence. The spring supports of the two lower through grooves on the same limit plate are on the same positioning plate.

10. A graphene battery pack according to claim 7, characterized in that: The shell and the piston cylinder are both made of heat-conducting materials.

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