A heat conduction cooling structure for a lithium-ion battery pack and a working method thereof

Abstract

The present invention discloses a heat-conducting cooling structure of a lithium-ion battery pack and a working method thereof, and relates to the technical field of heat dissipation of lithium-ion battery packs. The heat-conducting cooling structure of the lithium-ion battery pack comprises a lithium battery base, wherein a lower limit groove is arranged inside the lithium battery base, and nine lower limit grooves are arranged, and the nine lower limit grooves are distributed in an array of three rows and three columns. A lower ventilation groove aligned with the lower limit groove is arranged on the lower surface of the lithium battery base, and the lower ventilation groove is communicated with the lower limit groove. A lithium battery cell is arranged inside the lower limit groove, and a lithium battery upper cover is installed above the lithium battery base, and an upper limit groove aligned with the lower limit groove is arranged inside the lithium battery upper cover. The present solution solves the problem that although the existing device can adjust the heat dissipation position of the fan, it still performs local cooling of the cell, and the effect is not good, and due to the influence of the traditional fan, its wind force is mainly concentrated in the middle, and the diffused wind around is small, resulting in uneven heat dissipation in the pack.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of lithium-ion battery packs, and in particular to a heat-conducting cooling structure of a lithium-ion battery pack and a working method thereof. Background Art

[0002] Energy storage technology is an indispensable component of the current power system. Energy storage technology can be used to balance power supply loads, reduce peak loads and fill valleys, improve power quality, etc. Among them, electrochemical energy storage systems are favored for their high stability and high energy conversion efficiency. This system can make up for the intermittent and instability of renewable energy power generation, and can be flexibly deployed in scenarios of various sizes for wide application. Batteries generate a lot of heat during charging and discharging. Especially with the increase in electricity demand in various industries, battery capacity increases and is closely arranged, making it difficult to dissipate heat. Long-term operation in a high temperature environment will accelerate the attenuation of battery life and increase the risk of thermal runaway, posing a safety hazard. Therefore, in order to ensure the safe operation of lithium-ion batteries, a cooling structure is required to meet their long-term use requirements.

[0003] The cooling structure of the existing lithium-ion battery pack, such as the announcement number "CN115498311A", is named a multi-directional heat dissipation structure for a lithium-ion battery pack, which includes a battery pack shell, a rectangular groove is opened on the side wall of the battery pack shell, a central shaft is rotatably installed in the inner wall of the rectangular groove, a heat sink is fixedly installed on the side wall of the central shaft, a plate groove is opened on the upper end of the heat sink, a dustproof plate is slidably installed inside the plate groove, a T-shaped groove is opened on the inner wall of the battery pack shell, a circular groove is opened on the side wall of the battery pack shell adjacent to the heat sink, inner grooves are symmetrically opened on the side wall, and a lifting mechanism includes a lifting plate, the lifting plate is slidably arranged in the accommodating groove, first slide grooves are symmetrically opened on the side wall of the lifting plate, second slide grooves are opened in the inner walls of the two first slide grooves, sliders are slidably installed inside the two first slide grooves, and second extrusion springs are fixedly installed on the opposite ends of the two sliders.

[0004] However, although the above device can adjust the heat dissipation position of the fan, it still performs local cooling of the battery cell, which is not effective. In addition, affected by the traditional fan, the wind force is mainly concentrated in the middle, and the diffused wind around is small, resulting in uneven heat dissipation in the package. For this reason, we provide a lithium-ion battery pack thermal conductive cooling structure and a working method thereof. Summary of the invention

[0005] The object of the present invention is to provide a lithium-ion battery pack heat-conducting cooling structure and a working method thereof, so as to solve the problem that although the existing device proposed in the above background technology can adjust the heat dissipation position of the fan, it still performs local cooling of the battery cell, which is not effective, and is affected by the traditional fan, the wind force is mainly concentrated in the middle, and the diffused wind around is relatively small, resulting in uneven heat dissipation in the pack.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lithium-ion battery pack heat-conducting cooling structure, comprising a lithium battery base, wherein a lower limit groove is arranged inside the lithium battery base, and there are nine lower limit grooves, and the nine lower limit grooves are arranged in an array of three rows and three columns, and a lower ventilation groove is arranged on the lower surface of the lithium battery base, which is aligned with the lower limit groove, and the lower ventilation groove is connected with the lower limit groove, and a lithium battery cell is arranged inside the lower limit groove, and a lithium battery cover is installed above the lithium battery base, and an upper limit groove is arranged inside the lithium battery cover, which is aligned with the lower limit groove, and the upper surface of the lithium battery cover is provided with There is an upper ventilation slot aligned with the upper positioning slot, and the upper ventilation slot is connected to the upper positioning slot, an air inlet connection end is arranged at the front end of the lithium battery base, a lower air inlet duct is arranged below the rear end of the air inlet connection end, an upper air inlet duct is arranged above the rear end of the air inlet connection end, an air outlet connection end is arranged at the rear end of the lithium battery base, a lower air outlet duct is arranged below the air outlet connection end, and an upper air outlet duct is arranged above the air outlet connection end, two fan positioning slots are arranged on the end faces of the air inlet connection end and the air outlet connection end, wide-angle fans are installed on both sides of the air inlet connection end and the air outlet connection end, and the upper of the upper air inlet duct is provided with a lower air outlet duct. A wiring busbar is installed on the surface, a control box is installed above the wiring busbar, a connecting through hole is provided at the connection between the lithium battery cover and the lithium battery base, and a plurality of connecting through holes are provided, the lithium battery cover and the lithium battery base are connected by connecting through holes and screws, the fans in the air inlet connection end and the air outlet connection end respectively use blower blades and exhaust fan blades as fan blades, the blower blades are used by the air inlet connection end to draw air into the battery pack, and the exhaust fan blades in the air outlet connection end are used to exhaust air out of the battery pack, so as to significantly improve the heat dissipation effect, when assembling the battery pack, first place the lithium battery cell in the lower limit slot of the lithium battery base, and then cover Close the lithium battery cover, and use screws to cooperate with the corresponding connecting through holes on the lithium battery cover and the lithium battery base to fix the two, so as to clamp and position the lithium battery cell, and then connect the lithium battery cell to the wiring busbar on the upper air inlet duct. After completion, use the L-shaped plug-in slots on both sides of the upper air inlet duct and the lower air inlet duct to slide and connect with the L-shaped plug-in plates on the lithium battery base and the lithium battery cover until the air inlet connection end is attached to the end face of the lithium battery base, and then place the air outlet connection end on the other end of the lithium battery base, and use the connecting plate and bolts to lock it with the upper and lower air inlet ducts to realize the assembly of the air inlet connection end, the air outlet connection end and the lithium battery base.

[0007] Preferably, narrow flow sections are provided on both sides of the middle part of the lithium battery base, and a middle air inlet screen is provided on the outer wall of the narrow flow section.

[0008] Preferably, a motor support net is installed at the front end of the wide-angle fan, a main air inlet and exhaust hood is arranged at the middle position of the rear end of the wide-angle fan, the four corners of the rear end of the wide-angle fan are chamfered surfaces, and an auxiliary air inlet and exhaust hood is arranged on the chamfered surface. A motor is installed inside the motor support net, a transmission main shaft is installed on the output end of the motor, an active bevel gear is installed on the outer wall of the transmission main shaft, a main fan is arranged at the front end of the active bevel gear, and the end of the transmission main shaft rotates with the main air inlet and exhaust hood through a first bearing seat A second bearing seat is installed inside the auxiliary air inlet and exhaust hood, a driven shaft is installed on the inner side of the second bearing seat, an auxiliary fan is installed on the outer wall of the driven shaft, a driven bevel gear is installed on the end of the driven shaft, and the driven bevel gear is meshingly connected with the active bevel gear. When the wide-angle fan is running, the transmission main shaft and the main fan on the transmission main shaft are driven by the motor to rotate, and at the same time, the auxiliary fan with its body tilted outward can be driven to run through the cooperation of the active bevel gear and the driven bevel gear, so as to make up for the defects of the conventional fan.

[0009] Preferably, a positioning frame is installed on the end face of the wide-angle fan, and positioning through holes are provided at the four corners of the fan positioning slot and the positioning frame, and the fan positioning slot and the positioning frame are connected via positioning through holes and screws.

[0010] Preferably, the ends of the lower air outlet duct, the upper air outlet duct, the lower air inlet duct, and the upper air inlet duct are all provided with connecting plates, and adjacent connecting plates are connected by bolts.

[0011] Preferably, L-shaped plug-in grooves are provided inside both sides of the lower air inlet duct and the upper air inlet duct, and L-shaped plug-in plates are provided on both sides of the bottom surface of the lithium battery base and the top surface of the lithium battery cover. The lower air inlet duct and the upper air inlet duct are respectively slidably connected with the L-shaped plug-in plates on the lithium battery base and the lithium battery cover through the L-shaped plug-in grooves.

[0012] Preferably, the rear ends of the lower air inlet duct and the upper air inlet duct are both provided with plug-in convex strips, and the lower air outlet duct and the upper air outlet duct are provided with slots corresponding to the plug-in convex strips.

[0013] Preferably, flame-retardant cotton strips are provided on the inner walls of the lower limit groove and the upper limit groove.

[0014] Preferably, a gap flow channel is provided between adjacent lithium battery cells, and a plurality of groups of air guide plates are provided inside the gap flow channel, with each group of air guide plates having two air guide plates arranged at a V-shaped angle.

[0015] Preferably, a working method of a heat-conducting cooling structure of a lithium-ion battery pack comprises the following steps:

[0016] Step 1: Drive the wide-angle fans in the air inlet connection end and the air outlet connection end of the battery pack to run synchronously, wherein the wide-angle fans in the air inlet connection end and the air outlet connection end respectively use blower blades and exhaust blades as fan blades. When the wide-angle fans are running, the motor drives the transmission main shaft and the main fan on the transmission main shaft to rotate, and at the same time, the active bevel gear on the outer wall of the transmission main shaft and the four driven bevel gears around it drive the auxiliary fan on the driven shaft to rotate, and the main fan is used to draw exhaust air to the gap formed between the lithium battery base and the lithium battery upper cover, and the auxiliary fans located around it introduce wind into the upper and lower air ducts of the battery pack, thereby forming an effect of heat dissipation of the middle part of the lithium battery cell by the central wind, and auxiliary heat dissipation of the electrode end of the bottom surface of the lithium battery cell by the upper and lower winds;

[0017] Step 2: After the central wind generated by the main fan enters the gap formed between the lithium battery base and the lithium battery cover, the wind flows along the gap flow channel between the lithium battery cells to the air outlet connection end. The gap flow channel is arranged with air guide plates set at a V-shaped angle. When the wind passes through, the narrow tube effect increases the flow rate and speeds up the removal of heat. The middle part of the lithium battery cell is a high heat source site. The middle part of the lithium battery base adopts a narrow flow section structure, which aggravates the narrow tube effect in the middle. At the same time, a central air inlet partition is opened on the narrow flow section. Under the exhaust action of the wide-angle fan in the air outlet connection end, the air induction structure is added to the middle of the battery pack to accelerate the central heat dissipation effect.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention arranges an air inlet connection terminal and an air outlet connection terminal at both ends of the lithium-ion battery pack, and arranges an air duct structure connected with the air inlet connection terminal and the air outlet connection terminal above and below the battery pack. Special wide-angle fans are arranged in the air inlet connection terminal and the air outlet connection terminal, and the fans in the air inlet connection terminal and the air outlet connection terminal respectively use blower blades and exhaust fan blades as fan blades. The air inlet connection terminal uses the blower blades to draw air into the battery pack, and cooperates with the exhaust fan blades in the air outlet connection terminal to exhaust air out of the battery pack, so as to significantly improve the heat dissipation effect. When the wide-angle fan is in operation, the transmission main shaft and the main fan on the transmission main shaft are driven by the motor to rotate, and at the same time, the active bevel gear and the driven bevel gear cooperate to drive the whole body to the outside. The tilted auxiliary fan is operated to make up for the problem that the wind force of conventional fans is mainly concentrated in the middle and the wind force is relatively low around. During the process, the main fan can lead exhaust air to the gap formed between the lithium battery base and the lithium battery cover, while the auxiliary fans located on the surrounding areas lead the wind into the upper and lower air ducts of the battery pack, thereby forming an effect in which the central wind dissipates the heat in the middle of the lithium battery cell, and the upper and lower winds assist in dissipating the heat at the electrode end on the bottom of the lithium battery cell, ensuring the uniformity of heat dissipation in the battery pack and solving the problem that although the existing device can adjust the heat dissipation position of the fan, it still performs local cooling of the battery cell with poor effect, and affected by the traditional fan, its wind force is mainly concentrated in the middle, and the diffused wind around is relatively small, resulting in uneven heat dissipation in the pack. The present invention arranges air guide plates arranged at a V-shaped angle in the gap flow channel between adjacent lithium battery cells. When wind passes through, the flow rate can be increased through the narrow tube effect to speed up the removal of heat. After the lithium battery cells are arranged, the heat of adjacent cells will affect each other and accumulate, and the cell located in the middle is affected by the heat of the surrounding cells and often has the highest temperature. Therefore, a narrow flow section structure is adopted in the middle of the lithium battery base to reduce the flow channel, so that the flow rate of wind can be further accelerated through the narrow tube effect when passing through, and the heat of the middle cell is quickly reduced. At the same time, a central air inlet screen is opened on the narrow flow section. Under the exhaust action of the wide-angle fan in the air outlet connection end, an air induction structure is added to the middle of the battery pack to accelerate the central heat dissipation and cooling effect.The battery pack has a nested assembly structure. During assembly, the lithium battery cell is first placed in the lower limit groove of the lithium battery base, and then the lithium battery cover is closed. The lithium battery cover and the corresponding connecting through holes on the lithium battery base are used to fix the two, thereby clamping and positioning the lithium battery cell. The lithium battery cell is then connected to the wiring busbar on the upper air inlet duct. After completion, the L-shaped plug-in slots on both sides of the upper and lower air inlet ducts are used to slide and connect with the L-shaped plug-in plates on the lithium battery base and the lithium battery cover until the air inlet connection end is abutted against the end face of the lithium battery base, and then the air outlet connection end is placed At the other end of the lithium battery base, it is locked with the upper and lower air inlet ducts by connecting plates and bolts to realize the assembly of the air inlet connection end, the air outlet connection end and the lithium battery base. Each structure is a nested structure layer by layer, which is linked together to ensure the structural strength while allowing each part to be replaced independently, reducing the subsequent maintenance cost. The upper and lower air duct structures not only enable the battery core to achieve better uniform heat dissipation, but also when the battery pack is impacted, the cavity structure of the upper and lower air ducts can play an auxiliary buffering effect, avoiding the battery core from being directly impacted, thereby improving the safety of the battery pack. Description of the drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the air inlet connection end and the air outlet connection end of the present invention in a separated state;

[0022] Figure 3 It is a schematic structural diagram of the air inlet connection end and the wide-angle fan in a separated state of the present invention;

[0023] Figure 4 It is a front structural schematic diagram of the wide-angle fan of the present invention;

[0024] Figure 5 It is a schematic diagram of the back structure of the wide-angle fan of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal structure of the wide-angle fan of the present invention;

[0026] Figure 7 It is a schematic structural diagram of the lithium battery base, lithium battery cell and lithium battery cover in the combined state of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the lithium battery upper cover and the lithium battery base in a separated state of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the lithium battery base and the lithium battery core of the present invention in a separated state;

[0029] Fig.10 This is a schematic diagram of the bottom surface structure of the lithium battery upper cover of the present invention;

[0030] In the figure: 1. lithium battery base; 2. narrow flow section; 3. lithium battery cover; 4. middle air inlet screen; 5. air inlet connection end; 6. lower air inlet duct; 7. upper air inlet duct; 8. fan positioning slot; 9. wide-angle fan; 901. positioning frame; 902. positioning through hole; 903. chamfered cut surface; 904. main air inlet and exhaust hood; 905. auxiliary air inlet and exhaust hood; 906. first bearing seat; 907. second bearing seat; 908. motor support net; 909. motor; 910. transmission main shaft; 911. active bevel gear; 912. main air Fan; 913, driven shaft; 914, auxiliary fan; 915, driven bevel gear; 10, air outlet connection end; 11, lower air outlet duct; 12, upper air outlet duct; 13, connecting piece; 14, bolt; 15, wiring busbar; 16, control box; 17, L-shaped plug-in slot; 18, plug-in convex strip; 19, lithium battery cell; 20, L-shaped plug-in board; 21, connecting through hole; 22, upper ventilation slot; 23, lower ventilation slot; 24, lower limit slot; 25, flame-retardant cotton strip; 26, gap flow channel; 27, air guide plate; 28, upper limit slot. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-10The present invention provides an embodiment: a lithium-ion battery pack heat conduction cooling structure, including a lithium battery base 1, the lithium battery base 1 is provided with a lower limit groove 24, the lower limit groove 24 is provided with nine, and the nine lower limit grooves 24 are arranged in an array of three rows and three columns, the lower surface of the lithium battery base 1 is provided with a lower ventilation groove 23 aligned with the lower limit groove 24, and the lower ventilation groove 23 is connected to the lower limit groove 24, the lower limit groove 24 is provided with a lithium battery cell 19, the lithium battery A lithium battery cover 3 is installed above the battery base 1, an upper limit slot 28 aligned with the lower limit slot 24 is arranged inside the lithium battery cover 3, an upper ventilation slot 22 aligned with the upper limit slot 28 is arranged on the upper surface of the lithium battery cover 3, and the upper ventilation slot 22 is connected to the upper limit slot 28, an air inlet connection terminal 5 is arranged at the front end of the lithium battery base 1, a lower air inlet duct 6 is arranged below the rear end of the air inlet connection terminal 5, an upper air inlet duct 7 is arranged above the rear end of the air inlet connection terminal 5, and the lithium battery base An air outlet connection terminal 10 is provided at the rear end of the seat 1, a lower air outlet duct 11 is provided below the air outlet connection terminal 10, an upper air outlet duct 12 is provided above the air outlet connection terminal 10, two fan positioning grooves 8 are provided on the end faces of the air inlet connection terminal 5 and the air outlet connection terminal 10, wide-angle fans 9 are installed on both sides of the air inlet connection terminal 5 and the air outlet connection terminal 10, a wiring busbar 15 is installed on the upper surface of the upper air inlet duct 7, and a control box 16 is installed above the wiring busbar 15, a connecting through hole 21 is provided at the connection between the lithium battery cover 3 and the lithium battery base 1, and a plurality of connecting through holes 21 are provided, the lithium battery cover 3 and the lithium battery base 1 are connected by the connecting through hole 21 and screws, the battery pack can be equipped with a temperature sensor or a wind speed sensor according to actual needs, any failure of the air inlet and air outlet fans, resulting in temperature or wind speed changes, can be detected and judged in time, and feedback to the terminal maintenance, so as to avoid high temperature damage to the battery as much as possible and improve the safety of the battery pack.

[0033] See also Figure 1 Narrow flow sections 2 are provided on both sides of the middle of the lithium battery base 1, and a middle air inlet screen 4 is provided on the outer wall of the narrow flow section 2. The middle of the lithium battery cell 19 is a high heat source site. After the lithium battery cells 19 are arranged, the heat of adjacent cells will affect each other and accumulate, and the cell located in the middle is affected by the heat of the surrounding cells and often has the highest temperature. Therefore, the middle of the lithium battery base 1 adopts a narrow flow section 2 structure to narrow the flow channel, so that the wind can accelerate the flow rate through the narrow tube effect when passing through, and quickly reduce the heat of the middle cell. At the same time, a middle air inlet screen 4 is opened on the narrow flow section 2. Under the exhaust action of the wide-angle fan 9 in the air outlet connection end 10, an air induction structure is added to the middle of the battery pack to accelerate the central heat dissipation effect.

[0034] See also Figure 3-6A motor support net 908 is installed at the front end of the wide-angle fan 9, a main air inlet and exhaust cover 904 is arranged at the middle position of the rear end of the wide-angle fan 9, the four corners of the rear end of the wide-angle fan 9 are chamfered cut surfaces 903, and an auxiliary air inlet and exhaust cover 905 is arranged on the chamfered cut surface 903, a motor 909 is installed inside the motor support net 908, a transmission main shaft 910 is installed on the output end of the motor 909, an active bevel gear 911 is installed on the outer wall of the transmission main shaft 910, and a main fan 9 is arranged at the front end of the active bevel gear 911 12, the end of the transmission main shaft 910 is rotatably connected to the main air inlet and exhaust cover 904 through the first bearing seat 906, the second bearing seat 907 is installed inside the auxiliary air inlet and exhaust cover 905, the driven shaft 913 is installed on the inner side of the second bearing seat 907, the auxiliary fan 914 is installed on the outer wall of the driven shaft 913, the end of the driven shaft 913 is installed with a driven bevel gear 915, and the driven bevel gear 915 is meshed and driven with the active bevel gear 911, and the air inlet connection end 95 and the air outlet connection end 10 are connected to the wide-angle fan 915. The blower blades and the exhaust blades are respectively used as the fan blades. The air inlet connection end 5 uses the blower blades to draw air into the battery pack, and cooperates with the exhaust blades in the air outlet connection end 10 to exhaust air outside the battery pack, so as to significantly improve the heat dissipation effect. When the wide-angle fan 9 is running, the motor 909 drives the transmission main shaft 910 and the main fan 912 on the transmission main shaft 910 to rotate, and at the same time, the active bevel gear 911 on the outer wall of the transmission main shaft 910 and the four driven bevel gears 915 around it drive the auxiliary fan 91 on the driven shaft 913. 4 rotates, and the auxiliary fans 914 on all sides make up for the problem that the wind force of the conventional fan is mainly concentrated in the middle and the wind force on all sides is relatively low, so as to avoid the uneven heat dissipation in the battery pack. During the process, the main fan 912 is relied on to lead the exhaust air to the gap formed between the lithium battery base 1 and the lithium battery cover 3, and the auxiliary fans 914 located on all sides lead the wind into the upper and lower air ducts of the battery pack, so as to form the effect that the central wind dissipates the heat to the middle of the lithium battery cell 19, and the upper and lower winds assist in the heat dissipation of the electrode end at the bottom of the lithium battery cell 19.

[0035] See also Figure 3 and Figure 5 A positioning frame 901 is installed on the end face of the wide-angle fan 9, and positioning through holes 902 are provided at the four corners of the fan positioning slot 8 and the positioning frame 901, and the fan positioning slot 8 and the positioning frame 901 are connected through the positioning through holes 902 and screws. The wide-angle fan 9 is an independent and detachable structure, which is convenient for maintenance and replacement.

[0036] See also Figure 1 and Figure 2The ends of the lower air outlet 11, the upper air outlet 12, the lower air inlet 6, and the upper air inlet 7 are all provided with connecting pieces 13, and the adjacent connecting pieces 13 are connected by bolts 14. The interiors of both sides of the lower air inlet 6 and the upper air inlet 7 are provided with L-shaped plug-in grooves 17, and the bottom surface of the lithium battery base 1 and the top surface of the lithium battery cover 3 are both provided with L-shaped plug-in plates 20. The lower air inlet 6 and the upper air inlet 7 are respectively connected to the L-shaped plug-in grooves 17 on the lithium battery base 1 and the lithium battery cover 3. The plug-in board 20 is slidably connected, the rear ends of the lower air inlet 6 and the upper air inlet 7 are provided with plug-in convex strips 18, and the lower air outlet 11 and the upper air outlet 12 are provided with slots corresponding to the plug-in convex strips 18. When the battery pack is assembled, the lithium battery cell 19 is first placed in the lower limit groove 24 of the lithium battery base 1, and then the lithium battery cover 3 is covered, and the lithium battery cover 3 and the lithium battery base 1 are fixed by screws in conjunction with the connecting through holes 21 aligned on the lithium battery cover 3 and the lithium battery base 1, so as to clamp and position the lithium battery. The battery cell 19 is then connected to the wiring busbar 15 on the upper air inlet duct 7. After completion, the L-shaped plug-in grooves 17 on both sides of the upper air inlet duct 7 and the lower air inlet duct 6 are used to slide and connect with the L-shaped plug-in plates 20 on the lithium battery base 1 and the lithium battery upper cover 3 until the air inlet connection terminal 5 is abutted against the end face of the lithium battery base 1. Then, the air outlet connection terminal 10 is placed on the other end of the lithium battery base 1, and is locked with the upper air inlet duct 7 and the lower air inlet duct 6 by using the connecting piece 13 and the bolt 14 to realize the assembly of the air inlet connection terminal 5, the air outlet connection terminal 10 and the lithium battery base 1. The structures are nested layer by layer, interlocking with each other, which ensures the structural strength while allowing each part to be replaced independently, reducing the subsequent maintenance cost. The upper and lower air duct structures not only enable the battery cells to achieve better uniform heat dissipation, but also when the battery pack is impacted, the cavity structure of the upper and lower air ducts can play an auxiliary buffering effect, avoiding direct impact on the battery cell part, thereby improving the safety of the battery pack.

[0037] See also Fig. 9 and Fig.10 Flame-retardant cotton strips 25 are provided on the inner walls of the lower limit groove 24 and the upper limit groove 28. On the one hand, the flame-retardant cotton strips 25 rely on their own flexibility to fill the tightness of the connection between the lithium battery cell 19 and the limit groove, making the lithium battery cell 19 more stable after installation. On the other hand, its flexible material can play a buffering effect to a certain extent when the lithium battery cell 19 is subjected to external impact.

[0038] See also Figure 8 and Fig. 9 A gap flow channel 26 is arranged between adjacent lithium battery cells 19, and a plurality of groups of air guide plates 27 are arranged inside the gap flow channel 26. Each group of air guide plates 27 is provided with two and are arranged at a V-shaped angle. The air guide plates 27 arranged at the V-shaped angle can increase the flow rate through the narrow tube effect when the wind passes through, thereby accelerating the removal of heat.

[0039] See also Figure 1-10 , a working method of a heat-conducting cooling structure of a lithium-ion battery pack, comprising the following steps:

[0040] Step 1: Drive the wide-angle fans 9 in the air inlet connection end 5 and the air outlet connection end 10 of the battery pack to operate synchronously, wherein the wide-angle fans 9 in the air inlet connection end 5 and the air outlet connection end 10 respectively use blower blades and exhaust blades as fan blades. When the wide-angle fans 9 are in operation, the motor 909 drives the transmission main shaft 910 and the main fan 912 on the transmission main shaft 910 to rotate, and at the same time, the active bevel gear 911 on the outer wall of the transmission main shaft 910 and the four driven bevel gears 915 around it drive the auxiliary fan 914 on the driven shaft 913 to rotate, and the main fan 912 is used to draw exhaust air into the gap formed between the lithium battery base 1 and the lithium battery upper cover 3, and the auxiliary fans 914 located around it draw wind into the upper and lower air ducts of the battery pack, thereby forming an effect in which the central wind dissipates heat to the middle of the lithium battery cell 19, and the upper and lower winds assist in dissipating heat to the electrode end of the bottom surface of the lithium battery cell 19;

[0041] Step 2: After the central wind generated by the main fan 912 enters the gap formed between the lithium battery base 1 and the lithium battery cover 3, the wind flows along the gap flow channel 26 between the lithium battery cells 19 to the air outlet connection end 10. The gap flow channel 26 is arranged with an air guide plate 27 set at a V-shaped angle. When the wind passes through, the narrow tube effect increases the flow rate and speeds up the removal of heat. The middle part of the lithium battery cell 19 is a high heat source site. The middle part of the lithium battery base 1 adopts a narrow flow section 2 structure, which intensifies the middle narrow tube effect. At the same time, a middle air inlet partition 4 is opened on the narrow flow section 2. Under the exhaust action of the wide-angle fan 9 in the air outlet connection end 10, an air induction structure is added to the middle of the battery pack to accelerate the central heat dissipation effect.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A lithium-ion battery pack heat conduction cooling structure, comprising a lithium battery base (1), characterized in that: The lithium battery base (1) is provided with a lower limit groove (24) inside, and there are nine lower limit grooves (24), and the nine lower limit grooves (24) are arranged in an array of three rows and three columns. The lower surface of the lithium battery base (1) is provided with a lower ventilation groove (23) aligned with the lower limit groove (24), and the lower ventilation groove (23) is connected to the lower limit groove (24). The lower limit groove (24) is provided with a lithium battery cell (19). A lithium battery upper cover (3) is installed on the upper side, an upper limit groove (28) aligned with the lower limit groove (24) is arranged inside the lithium battery upper cover (3), an upper ventilation groove (22) aligned with the upper limit groove (28) is arranged on the upper surface of the lithium battery upper cover (3), and the upper ventilation groove (22) is connected to the upper limit groove (28), and an air inlet connection end (5) is arranged at the front end of the lithium battery base (1), and a lower air inlet duct (6) is arranged below the rear end of the air inlet connection end (5). ), an upper air inlet duct (7) is arranged above the rear end of the air inlet connection end (5), an air outlet connection end (10) is arranged at the rear end of the lithium battery base (1), a lower air outlet duct (11) is arranged below the air outlet connection end (10), an upper air outlet duct (12) is arranged above the air outlet connection end (10), two fan positioning grooves (8) are arranged on the end surfaces of the air inlet connection end (5) and the air outlet connection end (10), and the air inlet connection end (5) and the air outlet connection end (10) are arranged on the rear end surfaces of the air inlet connection end (5) and the air outlet connection end (10). Wide-angle fans (9) are installed on both sides of the connection terminal (10); a wiring busbar (15) is installed on the upper surface of the upper air inlet duct (7); a control box (16) is installed above the wiring busbar (15); a connection through hole (21) is provided at the connection between the lithium battery upper cover (3) and the lithium battery base (1); and a plurality of connection through holes (21) are provided; the lithium battery upper cover (3) and the lithium battery base (1) are connected via the connection through holes (21) and screws; Narrow flow sections (2) are provided on both sides of the middle of the lithium battery base (1), and a middle air inlet screen (4) is provided on the outer wall of the narrow flow section (2); A motor support net (908) is installed at the front end of the wide-angle fan (9); a main air inlet and exhaust hood (904) is arranged at the middle position of the rear end of the wide-angle fan (9); the four corners of the rear end of the wide-angle fan (9) are chamfered cut surfaces (903); an auxiliary air inlet and exhaust hood (905) is arranged on the chamfered cut surfaces (903); a motor (909) is installed inside the motor support net (908); a transmission main shaft (910) is installed on the output end of the motor (909); active bevel gears (911) are installed on the outer wall of the transmission main shaft (910); the active bevel gears (911) are installed on the outer wall of the transmission main shaft (910); and the active bevel gears (911) are installed on the outer wall of the transmission main shaft (910). A main fan (912) is arranged at the front end of the transmission main shaft (910), the end of the transmission main shaft (910) is rotatably connected to the main air inlet and exhaust cover (904) via a first bearing seat (906), a second bearing seat (907) is installed inside the auxiliary air inlet and exhaust cover (905), a driven shaft (913) is installed on the inner side of the second bearing seat (907), an auxiliary fan (914) is installed on the outer wall of the driven shaft (913), a driven bevel gear (915) is installed at the end of the driven shaft (913), and the driven bevel gear (915) is meshingly transmission-connected with the driving bevel gear (911); A gap flow channel (26) is provided between adjacent lithium battery cells (19), and a plurality of groups of air guide plates (27) are provided inside the gap flow channel (26), with each group of air guide plates (27) having two air guide plates arranged at a V-shaped angle; The end surface of the wide-angle fan (9) is provided with a positioning frame (901), the fan positioning groove (8) and the four corners of the positioning frame (901) are provided with positioning through holes (902), and the fan positioning groove (8) and the positioning frame (901) are connected via the positioning through holes (902) and screws, the ends of the lower air outlet duct (11), the upper air outlet duct (12) and the lower air inlet duct (6), and the upper air inlet duct (7) are provided with connecting pieces (13), and adjacent connecting pieces (13) are connected via bolts (14), and the lower air inlet duct (6) and the upper air inlet duct (7) are provided with connecting pieces (13) on both sides. L-shaped plug-in grooves (17) are provided inside the lithium battery base (1), L-shaped plug-in plates (20) are provided on both sides of the bottom surface of the lithium battery base (1) and the top surface of the lithium battery cover (3), the lower air inlet duct (6) and the upper air inlet duct (7) are respectively connected to the L-shaped plug-in plates (20) on the lithium battery base (1) and the lithium battery cover (3) through the L-shaped plug-in grooves (17), the rear ends of the lower air inlet duct (6) and the upper air inlet duct (7) are provided with plug-in convex strips (18), and the lower air outlet duct (11) and the upper air outlet duct (12) are provided with slots corresponding to the plug-in convex strips (18).

2. A heat-conducting cooling structure for a lithium-ion battery pack according to claim 1, characterized in that: Flame-retardant cotton strips (25) are provided on the inner walls of the lower limit groove (24) and the upper limit groove (28).

3. A working method of a lithium-ion battery pack heat-conducting cooling structure, based on the lithium-ion battery pack heat-conducting cooling structure of claim 2, characterized in that: The following steps are involved: Step 1: driving the wide-angle fans (9) in the air inlet connection end (5) and the air outlet connection end (10) of the battery pack to operate synchronously, wherein the wide-angle fans (9) in the air inlet connection end (5) and the air outlet connection end (10) respectively use blower blades and exhaust blades. When the wide-angle fans (9) are in operation, the motor (909) drives the transmission main shaft (910) and the main fan (912) on the transmission main shaft (910) to rotate, and at the same time, the active bevel gears (912) on the outer wall of the transmission main shaft (910) are driven to rotate. 11) is driven by four driven bevel gears (915) on the periphery to drive the auxiliary fan (914) on the driven shaft (913) to rotate, and the main fan (912) is used to draw exhaust air into the gap formed between the lithium battery base (1) and the lithium battery cover (3), while the auxiliary fans (914) located on the periphery draw air into the upper and lower air ducts of the battery pack, thereby forming an effect in which the central wind dissipates heat to the middle of the lithium battery cell (19), and the upper and lower winds assist in dissipating heat to the electrode end of the bottom surface of the lithium battery cell (19); Step 2: After the central wind generated by the main fan (912) enters the gap formed between the lithium battery base (1) and the lithium battery upper cover (3), the wind flows along the gap flow channel (26) between the lithium battery cells (19) toward the air outlet connection end (10). The gap flow channel (26) is provided with air guide plates (27) arranged at a V-shaped angle. When the wind passes through, the narrow tube effect increases the flow velocity and accelerates the removal of heat. The middle of the lithium battery cell (19) is a high heat source site. The middle of the lithium battery base (1) adopts a narrow flow section (2) structure, which intensifies the narrow tube effect in the middle. At the same time, a middle air inlet screen (4) is provided on the narrow flow section (2). Under the exhaust action of the wide-angle fan (9) in the air outlet connection end (10), an air induction structure is added to the middle of the battery pack to accelerate the central heat dissipation effect.

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