High-capacity lithium ion battery pack

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a high-capacity lithium ion battery pack which comprises a box body, a top plate is arranged at the top of the box body, a supporting plate is fixed in the middle of the box body, and the box body is divided into an upper mounting cavity and a lower air inlet cavity through the supporting plate; the placement rack comprises a mounting frame fixed at the top of the supporting plate, the middle of the mounting frame is divided into a plurality of placement cavities for mounting battery main bodies through partition plates, cavities are formed in the middles of the mounting frame and the partition plates, and first air outlet holes are uniformly distributed in the tops of the mounting frame and the partition plates; an air inlet communicated with the inner cavity is formed in the inner wall of the mounting frame; according to the battery pack, the mounting frame, the partition plate and the first air outlet holes are arranged to dissipate heat of the side edges of the battery main bodies, and the first air outlet holes are uniformly distributed below the peripheries of the plurality of battery main bodies, so that discharged airflow can be in contact with each side edge of the battery, the problem of uneven heat dissipation of the battery pack is effectively solved, and the risk of heat accumulation can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and specifically relates to a high-capacity lithium-ion battery pack. Background Art

[0002] In modern energy applications, high-capacity lithium-ion battery packs play a key role in multiple fields, including electric vehicles, hybrid vehicles, energy storage systems, and mobile devices. To achieve longer usage times and higher energy efficiency, high-capacity battery packs usually increase the energy storage capacity by increasing the volume and weight of the batteries, or achieve higher energy density by optimizing the battery materials and designs. Especially in the fields of electric vehicles and hybrid vehicles, the technological progress of high-capacity battery packs is a key factor in achieving long-distance driving and improving energy efficiency.

[0003] Lithium-ion batteries have become the mainstream choice in high-capacity battery packs due to their high energy density, long lifespan, high charge and discharge efficiency, etc. As the battery capacity increases, the thermal management problem of the battery pack gradually emerges. Especially in the heat dissipation of high-capacity battery packs, the increase in temperature may lead to a decline in battery performance or even failure. Therefore, the heat dissipation design is particularly important.

[0004] A patent for invention with the publication number of CN118315722B discloses a heat dissipation component for an energy storage battery box, which relates to the technical field of energy storage battery boxes and includes an I-shaped plate. Peripheral plates are fixedly connected to the front and rear edges of the upper end of the I-shaped plate, and a top plate is fixedly connected to the upper ends of the two peripheral plates. The gaps between multiple closely arranged batteries in the energy storage battery box can not only be increased, but also the box body of the energy storage battery box can be disassembled to a certain extent, which greatly increases the air circulation. Coupled with the air-cooling mechanism, the heat dissipation of the energy storage battery box can be greatly improved, avoiding the normal use of the energy storage battery box being affected by excessive temperature. Conversely, all the batteries will return to their original positions and be closely arranged, and the box body of the energy storage battery box will also close, thereby reducing the occupied space and dust prevention. The blowing of the air-cooling mechanism can be locally guided and redirected so that the batteries with position changes can still be blown, thereby further improving the heat dissipation effect.

[0005] In the above technology, the airflow generated by the cooling fan flows along the length direction of the box body. Although the air circulation is increased by increasing the distance between the batteries, the air intake volume between two adjacent batteries along the length direction of the box body is small, resulting in uneven distribution of the air-cooling airflow along the length direction of the box body. This may lead to insufficient heat dissipation of some batteries, thereby bringing the risk of local heat accumulation. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, the present invention provides a high-capacity lithium-ion battery pack to solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems includes:

[0008] A box body, a top plate is provided on the top of the box body, and a support plate is fixed in the middle of the box body. The box body is divided into an installation cavity above and a ventilation cavity below by the support plate;

[0009] A placement rack, the placement rack is arranged in a placement cavity above the support plate. The placement rack includes an installation frame fixed on the top of the support plate. A plurality of placement cavities for installing battery bodies are separated by partitions in the middle of the installation frame. Cavities are provided in the middle of the installation frame and the partitions. Air outlet holes I are evenly distributed on the tops of the installation frame and the partitions. Air inlet ports communicating with the internal cavities are opened on the inner wall of the installation frame;

[0010] An air-cooling component, the air-cooling component is arranged below the placement rack, and air is blown into the cavities between the installation frame and the partitions through the air-cooling component.

[0011] Preferably, the air-cooling component includes a fan, the fan is inlaid and fixed on the support plate, the fan is arranged below the middle of the installation frame, air inlet ports are provided on both sides of the box body and below the support plate, and a first filter screen is installed in the air inlet ports. An air outlet is provided in the middle of the top plate, and a second filter screen is fixed in the air outlet.

[0012] Preferably, the battery body is placed on the top of a support ring. The top end of the partition is flush with the top end of the installation frame. There is a gap between the bottom end of the partition and the support plate. A support ring is fixed at the bottom of the inner wall of the placement cavity surrounded by the installation frame and the partition. The battery body is installed above the support ring.

[0013] Preferably, electric push rods are symmetrically fixed on both sides of the support plate. A connecting plate is fixed on the top of the electric push rods. The top plate is fixed on the top of the connecting plate by bolts.

[0014] Preferably, sleeves are symmetrically fixed on both sides of the support plate. A piston rod is hermetically and slidably installed in the middle of the sleeves. The top end of the piston rod is fixed below the end of the connecting plate.

[0015] Preferably, a fixed frame is fixed between the air inlet ports on both sides of the box body. The first filter screen is arranged outside the fixed frame. A sliding rod is fixed on the side of the filter screen. The sliding rod slidably penetrates through a sliding hole opened on the fixed frame and extends into the box body. An activity plate is vertically arranged inside the fixed frame. The activity plate is fixedly connected to the end of the sliding rod. A spring is fixedly installed between the activity plate and the fixed frame. A plurality of arc-shaped bumps are evenly distributed on the side of the activity plate. A U-shaped pipe is arranged below the support plate. Both ends of the U-shaped pipe extend into the sleeves and are fixed to the bottom of the piston rod. A cross pipe is fixed to the bottom side of the U-shaped pipe through a connecting pipe. The cross pipe is adapted to the bumps.

[0016] Preferably, the U-shaped tube is hermetically and slidably arranged in a through hole formed in the support plate, air outlet holes II are uniformly distributed on the side wall of the horizontal tube, and a gas guiding hole is formed at the top end of the U-shaped tube.

[0017] Preferably, the mounting frame and the partition are made of copper material.

[0018] Preferably, a grille is fixed to the top of the filter screen II.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. For the large-capacity lithium-ion battery pack of the present invention, a plurality of battery bodies are installed in corresponding placement cavities, the battery bodies are installed and limited by the mounting frame and the partition, and the plurality of battery bodies are separated by the partition. When heat dissipation of the battery bodies is required, the air-cooling assembly blows air into the inner cavity between the mounting frame and the partition through the air inlet, and the air flow is discharged through the air outlet holes I at the top of the mounting frame and the partition, so as to dissipate heat from the sides of the battery bodies. The air outlet holes I are uniformly distributed below the peripheries of the plurality of battery bodies, so that the discharged air flow can contact each side of the battery, effectively solving the problem of uneven heat dissipation of the battery pack and reducing the risk of heat accumulation.

[0021] 2. For the large-capacity lithium-ion battery pack of the present invention, when the battery pack needs to quickly meet the requirements of high-power charging and discharging, more heat will be generated by the plurality of battery bodies than during normal operation. At this time, the electric push rod is used to push the connecting plate and the top plate to move upward, so that the top plate is separated from the box body, and the air circulation can be improved by increasing the opening area of the top cover, thereby enhancing the heat dissipation effect. Description of the Drawings

[0022] The present invention will be further described below with reference to the drawings.

[0023] Figure 1 is a perspective view of the present invention;

[0024] Figure 2 is an internal schematic diagram of the present invention;

[0025] Figure 3 is a partial structural cross-sectional view of the present invention;

[0026] Figure 4 is a cross-sectional view of the present invention;

[0027] Figure 5 is Figure 4 the enlarged view at A in

[0028] Figure 6 is Figure 5 the enlarged view at B in

[0029] Figure 7 It is a schematic diagram of the bottom of the placement rack of the present invention.

[0030] In the figure: 1. Box body; 2. Top plate; 3. First filter screen; 4. Second filter screen; 5. Support plate; 6. Installation frame; 7. Battery main body; 8. Electric push rod; 9. Sleeve; 10. Piston rod; 11. Connecting plate; 12. Partition board; 13. Support ring; 14. First air outlet; 15. Fan; 16. Air inlet; 17. U-shaped pipe; 18. Connecting pipe; 19. Horizontal pipe; 20. Fixed frame; 21. Air guide hole; 22. Second air outlet; 23. Movable plate; 24. Convex block; 25. Slide bar; 26. Spring; 27. Grille. Specific embodiments

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0032] Embodiment 1: As Figures 1 to 7 shown, a large-capacity lithium-ion battery pack described in an embodiment of the present invention includes:

[0033] A box body 1, with a top plate 2 provided at the top of the box body 1, and a support plate 5 fixed in the middle of the box body 1. The box body 1 is divided into an upper installation cavity and a lower air inlet cavity by the support plate 5;

[0034] A placement rack, which is arranged in a placement cavity above the support plate 5. The placement rack includes an installation frame 6 fixed on the top of the support plate 5. A plurality of placement cavities for installing the battery main body 7 are separated by a partition board 12 in the middle of the installation frame 6. Cavities are provided in the middle of the installation frame 6 and the partition board 12. First air outlets 14 are evenly distributed on the tops of the installation frame 6 and the partition board 12. An air inlet 16 communicating with the internal cavity is opened on the inner wall of the installation frame 6;

[0035] An air cooling component, which is arranged below the placement rack, and blows air into the cavities between the installation frame 6 and the partition board 12 through the air cooling component;

[0036] During operation, a plurality of battery main bodies 7 are installed in the corresponding placement cavities. The battery main bodies 7 are installed and limited by the installation frame 6 and the partition board 12. The plurality of battery main bodies 7 are separated by the partition board 12. When heat dissipation of the battery main bodies 7 is required, the air cooling component blows air into the internal cavities between the installation frame 6 and the partition board 12 through the air inlet 16. The air flow is discharged through the first air outlets 14 on the tops of the installation frame 6 and the partition board 12, so as to dissipate heat from the sides of the battery main bodies 7. The first air outlets 14 are evenly distributed below the peripheries of the plurality of battery main bodies 7, so that the discharged air flow can contact each side of the battery, effectively solving the problem of uneven heat dissipation of the battery pack and reducing the risk of heat accumulation.

[0037] It should be noted that for the series connection of multiple battery bodies 7, the positive and negative interfaces of the battery pack (not shown in the figure) are arranged on the side wall of the box body.

[0038] The air-cooling component includes a fan 15, which is fixedly installed on the support plate 5 in an embedded manner. The fan 15 is arranged below the middle of the installation frame 6. Air inlets are provided on both sides of the box body 1 and below the support plate 5, and a first filter screen 3 is installed in the air inlets. An air outlet is provided in the middle of the top plate 2, and a second filter screen 4 is fixed in the air outlet. During operation, the fan 15 is started to accelerate the flow of gas inside the box body 1. Air is introduced into the air inlet cavity at the bottom of the box body 1 through the air inlets, and then the air is introduced into the internal cavities of the placement frame and the partition 12 by the fan 15. The air is discharged from the first air outlet holes 14 and finally discharged from the air outlet, so that the air continuously circulates inside the box body 1, thereby facilitating continuous heat dissipation from the side walls of the battery body 7. The dust in the air is filtered by the first filter screen 3 and the second filter screen 4 to prevent dust from accumulating on the surfaces of the battery body 7 and related electronic components, which may affect the equipment.

[0039] The battery body 7 is placed on the top of the support ring 13. The top end of the partition 12 is flush with the top end of the installation frame 6, and there is a gap between the bottom end of the partition 12 and the support plate 5. The support ring 13 is fixed to the bottom of the inner wall of the placement cavity formed by the installation frame 6 and the partition 12. The battery body 7 is installed above the support ring 13. During operation, the installation frame 6, the partition 12, and the support ring 13 enclose a placement cavity for installing the battery body 7. During the heat dissipation process, the fan 15 blows air upward, and the air flow contacts the bottom of the battery through the support ring 13 to dissipate heat from the bottom of the battery. Moreover, the air flow flows in the space below the support ring 13 and carries the heat at the bottom of the battery body 7 into the inner cavity of the installation frame 6 and the partition 12 through the air inlet 16, and finally is discharged from the first air outlet, so as to dissipate heat from the battery body 7 more comprehensively.

[0040] Electric push rods 8 are symmetrically and fixedly installed on both sides of the support plate 5. A connecting plate 11 is fixed to the top of the electric push rods 8, and the top plate 2 is fixed to the top of the connecting plate 11 by bolts. During operation, when the battery pack needs to quickly meet the requirements of high-power charging and discharging, more heat will be generated by the multiple battery bodies 7 than during normal operation. At this time, the electric push rods 8 are used to push the connecting plate 11 and the top plate 2 upward, so that the top plate 2 is separated from the box body 1. By increasing the opening area of the top cover, the air circulation can be improved, and thus the heat dissipation effect can be enhanced.

[0041] Sleeves 9 are symmetrically and fixedly installed on both sides of the support plate 5. A piston rod 10 is installed in the middle of the sleeve 9 in a sealed and sliding manner. The top end of the piston rod 10 is fixed below the end of the connecting plate 11. During operation, the sleeves 9 and the piston rod 10 are provided to support both ends of the connecting plate 11, so that the installation of the top plate 2 is more stable.

[0042] A fixing frame 20 is fixed in the middle of the air inlets on both sides of the box body 1. The first filter screen 3 is arranged outside the fixing frame 20. A sliding rod 25 is fixed on the side of the filter screen. The sliding rod 25 slidably penetrates through a sliding hole opened on the fixing frame 20 and extends into the box body 1. An activity plate 23 is vertically arranged inside the fixing frame 20. The activity plate 23 is fixedly connected to the end of the sliding rod 25. A spring 26 is fixedly installed between the activity plate 23 and the fixing frame 20. A plurality of arc-shaped bumps 24 are evenly distributed on the side of the activity plate 23. A U-shaped pipe 17 is arranged below the support plate 5. Both ends of the U-shaped pipe 17 extend into the sleeve 9 and are fixed to the bottom of the piston rod 10. A horizontal pipe 19 is fixedly connected to the bottom side of the U-shaped pipe 17 through a connecting pipe 18. The horizontal pipe 19 is adapted to the bumps 24;

[0043] During operation, when the electric push rod 8 pushes the connecting plate 11 and the top plate 2 to move upward, the piston rod 10 relatively moves upward along the sleeve 9. The piston rod 10 drives the U-shaped pipe 17, the connecting pipe 18 and the horizontal pipe 19 to move upward simultaneously. During the upward movement of the horizontal pipe 19, it contacts a plurality of arc-shaped bumps 24 in sequence. When the horizontal pipe 19 contacts the bump 24, it can push the activity plate 23 to approach the fixing frame 20, and push the first filter screen 3 to separate from the fixing frame 20 through the sliding rod 25. During this process, the spring 26 is compressed. When the horizontal pipe 19 passes through the highest point of the bump 24, the spring 26 rebounds, pushing the activity plate 23, the sliding rod 25 and the first filter screen 3 to move back until they are completely reset. In this way, the first filter screen 3 can reciprocate left and right intermittently, so as to intermittently touch the fixing frame 20, generating vibration, so as to vibrate the dust and impurities attached to the outer surface of the first filter screen 3, avoid blocking the first filter screen 3, and make the air circulation smoother.

[0044] The U-shaped pipe 17 is hermetically and slidably arranged in a through hole opened on the support plate 5. A plurality of second air outlet holes 22 are evenly distributed on the side wall of the horizontal pipe 19. A gas guide hole 21 is opened at the top end of the U-shaped pipe 17; During operation, when the piston rod 10 drives the U-shaped pipe 17 to move upward, the volume of the lower inner cavity of the sleeve 9 increases, and negative pressure is generated in the inner cavity. Air is inhaled into the inner cavity through the U-shaped pipe 17, the connecting pipe 18, the horizontal pipe 19, the second air outlet holes 22 and the gas guide hole 21. When the electric push rod 8 drives the top plate 2 to move downward to cover the top of the box body 1, the fan 15 is turned off, and the piston rod 10 moves downward synchronously, and at the same time, the air in the inner cavity of the sleeve 9 is discharged. The air passes through the inner cavities of the U-shaped pipe 17, the connecting pipe 18 and the horizontal pipe 19, and then is ejected from the second air outlet holes 22, blowing air from the inside of the first filter screen 3 to the outside, so as to blow off the dust and impurities attached to the outer surface of the first filter screen 3 and further improve the dust removal effect.

[0045] The mounting frame 6 and the partition 12 are made of copper materials; during operation, using copper materials to manufacture the mounting frame 6 and the partition 12 can significantly improve the heat dissipation performance. The high thermal conductivity of copper enables it to quickly conduct the heat on the surface of the battery body 7, preventing the battery body 7 from overheating and ensuring that it operates within a safe and efficient temperature range; moreover, when the air flow passes through the middle cavity between the mounting frame 6 and the partition 12, the heat can be quickly discharged to improve the heat dissipation performance.

[0046] Embodiment 2: As Figure 1 shown, compared with Embodiment 1, another implementation manner of the present invention is that a grille 27 is fixed to the top of the second filter screen 4; during operation, the grille 27 is provided to protect the second filter screen 4 from being damaged by external impact.

[0047] Working principle: A plurality of battery bodies 7 are installed in the corresponding placement cavities. The battery bodies 7 are installed and limited by the mounting frame 6 and the partition 12, and the plurality of battery bodies 7 are separated by the partition 12. When heat dissipation of the battery bodies 7 is required, the air-cooling assembly blows air into the middle cavity between the mounting frame 6 and the partition 12 through the air inlet 16, and the air flow is discharged through the first air outlet holes 14 at the top of the mounting frame 6 and the partition 12 to dissipate heat from the sides of the battery bodies 7. The first air outlet holes 14 are evenly distributed below the peripheries of the plurality of battery bodies 7, so that the discharged air flow can contact each side of the battery, effectively solving the problem of uneven heat dissipation of the battery pack and reducing the risk of heat accumulation;

[0048] When the battery pack needs to quickly meet the requirements of high-power charging and discharging, more heat is generated by the plurality of battery bodies 7 than during normal operation. At this time, the electric push rod 8 is used to push the connecting plate 11 and the top plate 2 upward, so that the top plate 2 is separated from the box body 1. By increasing the opening area of the top cover, the air circulation can be improved, thereby enhancing the heat dissipation effect;

[0049] When the electric push rod 8 is used to push the connecting plate 11 and the top plate 2 upward, the piston rod 10 relatively moves upward along the sleeve 9. The piston rod 10 drives the U-shaped tube 17, the connecting tube 18, and the cross tube 19 to move upward simultaneously. During the upward movement of the cross tube 19, it successively contacts a plurality of arc-shaped protrusions 24. When the cross tube 19 contacts the protrusion 24, it can push the movable plate 23 closer to the fixed frame 20, and the first filter screen 3 is pushed away from the fixed frame 20 by the slide rod 25. In this process, the spring 26 is compressed. When the cross tube 19 passes through the highest point of the protrusion 24, the spring 26 rebounds, pushing the movable plate 23, the slide rod 25, and the first filter screen 3 to move back until they are completely reset. In this way, the first filter screen 3 can move left and right reciprocally at intervals, thereby intermittently touching the fixed frame 20 to generate vibration, so as to vibrate the dust and impurities attached to the outer surface of the first filter screen 3, prevent the first filter screen 3 from being blocked, and make the air circulation smoother;

[0050] When the piston rod 10 drives the U-shaped tube 17 to move upward, the volume of the lower inner cavity of the sleeve 9 increases, and a negative pressure is generated in the inner cavity. Air is inhaled into the inner cavity through the U-shaped tube 17, the connecting pipe 18, the horizontal pipe 19, the second air outlet 22 and the air guiding hole 21. When the electric push rod 8 drives the top plate 2 to move downward and cover the top of the box body 1, the fan 15 is turned off, and the piston rod 10 moves downward synchronously. At the same time, the air in the inner cavity of the sleeve 9 is discharged. The air passes through the inner cavities of the U-shaped tube 17, the connecting pipe 18 and the horizontal pipe 19, and then is ejected from the second air outlet 22 and blows outward from the inside of the first filter screen 3, so as to blow off the dust and impurities attached to the outer surface of the first filter screen 3 and further improve the dust removal effect.

[0051] The above front, back, left, right, up and down are all based on the Figure 1 description in the accompanying drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 should not be construed as limiting the protection scope of the present invention.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-capacity lithium-ion battery pack, characterized in that: Comprising: A box body (1), a top plate (2) is provided on the top of the box body (1), and a support plate (5) is fixed in the middle of the box body (1). The box body (1) is divided into an upper installation cavity and a lower air inlet cavity by the support plate (5); A placement rack, the placement rack is arranged in the placement cavity above the support plate (5). The placement rack includes a mounting frame (6) fixed to the top of the support plate (5). A plurality of placement cavities for mounting battery bodies (7) are separated by a partition plate (12) in the middle of the mounting frame (6). Cavities are provided in the middle of the mounting frame (6) and the partition plate (12). Air outlet holes one (14) are evenly distributed on the tops of the mounting frame (6) and the partition plate (12). An air inlet (16) communicating with the internal cavity is formed on the inner wall of the mounting frame (6); An air-cooling component, the air-cooling component is arranged below the placement rack, and air is blown into the cavity between the mounting frame (6) and the partition plate (12) through the air-cooling component.

2. The large-capacity lithium-ion battery pack according to claim 1, wherein: The air-cooling component includes a fan (15), the fan (15) is fixedly mounted on the support plate (5) in an inlaid manner, the fan (15) is arranged below the middle of the mounting frame (6), air inlets are provided on both sides of the box body (1) and below the support plate (5), and a first filter screen (3) is installed in the air inlets. An air outlet is provided in the middle of the top plate (2), and a second filter screen (4) is fixed in the air outlet.

3. A large-capacity lithium-ion battery pack according to claim 1, characterized in that: The battery body (7) is placed on the top of the support ring (13). The top end of the partition plate (12) is flush with the top end of the mounting frame (6). There is a gap between the bottom end of the partition plate (12) and the support plate (5). A support ring (13) is fixed to the bottom of the inner wall of the placement cavity surrounded by the mounting frame (6) and the partition plate (12). The battery body (7) is installed above the support ring (13).

4. A large-capacity lithium-ion battery pack according to claim 1, characterized in that: Electric push rods (8) are symmetrically fixed on both sides of the support plate (5). A connecting plate (11) is fixed to the top of the electric push rods (8). The top plate (2) is fixed to the top of the connecting plate (11) by bolts.

5. A large-capacity lithium-ion battery pack according to claim 4, characterized in that: Sleeves (9) are symmetrically fixed on both sides of the support plate (5). A piston rod (10) is hermetically and slidably installed in the middle of the sleeves (9). The top end of the piston rod (10) is fixed below the end of the connecting plate (11).

6. The large-capacity lithium-ion battery pack according to claim 2, characterized in that: A fixing frame (20) is fixed in the middle of the air inlets on both sides of the box body (1). The first filter screen (3) is arranged outside the fixing frame (20). A sliding rod (25) is fixed on the side of the filter screen. The sliding rod (25) slidably penetrates through a sliding hole formed in the fixing frame (20) and extends into the box body (1). An activity plate (23) is vertically arranged inside the fixing frame (20). The activity plate (23) is fixedly connected to the end of the sliding rod (25). A spring (26) is fixedly installed between the activity plate (23) and the fixing frame (20). A plurality of arc-shaped bumps (24) are evenly distributed on the side of the activity plate (23). A U-shaped pipe (17) is arranged below the support plate (5). Both ends of the U-shaped pipe (17) extend into the sleeve (9) and are fixed to the bottom of the piston rod (10). A horizontal pipe (19) is fixed to the bottom side of the U-shaped pipe (17) through a connecting pipe (18). The horizontal pipe (19) is adapted to the bumps (24).

7. A large-capacity lithium-ion battery pack according to claim 6, characterized in that: The U-shaped pipe (17) is hermetically and slidably arranged in a through hole formed in the support plate (5). A plurality of second air outlet holes (22) are evenly distributed on the side wall of the horizontal pipe (19). A gas guide hole (21) is formed at the top of the U-shaped pipe (17).

8. A large-capacity lithium-ion battery pack according to claim 1, characterized in that: The mounting frame (6) and the partition plate (12) are made of copper material.

9. A large-capacity lithium-ion battery pack according to claim 2, characterized in that: A grille (27) is fixed to the top of the second filter screen (4).

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