A loader lithium battery charging protection system

Abstract

The application discloses a loader lithium battery charging protection system, which comprises a temperature sensor, an alarm and an overcharge protection component. When overcharge occurs, the temperature of the lithium battery pack will rise. At this time, the temperature sensor will sense the temperature and trigger the alarm to give an alarm to remind the staff to cut off the power supply. In the process, the overcharge protection component will be triggered to protect the lithium battery pack from overcharge. The staff can be reminded to terminate charging in the first time. In different installation and use occasions, the cooperation of the top overcharge protection component and the first auxiliary component, the cooperation of the top overcharge protection component and the second auxiliary component, and the cooperation of the side overcharge protection component can realize rapid early warning and reminding of the lithium battery pack, and can also guarantee the overcharge heat dissipation of the lithium battery pack and improve the functionality of the overcharge protection.

Description

Technical Field

[0001] This invention relates to the field of lithium battery charging protection technology, specifically to a lithium battery charging protection system for a loader. Background Technology

[0002] With the development of the new energy industry, the demand for lithium batteries is increasing, and the types of lithium batteries are also becoming more and more diverse.

[0003] Under current technology, the following points should be noted regarding lithium battery charging: Moderate charging is essential; maintaining proper charging and discharging can extend battery life. Keeping the lithium-ion battery charge between 10% and 90% is beneficial for battery protection. The optimal charging temperature range for lithium batteries is 0 to 45 degrees Celsius. Overcharging must be avoided. Any form of overcharging will severely damage battery performance and may even lead to explosion.

[0004] In current technology, lithium batteries used in loaders are charged directly without disassembly. To ensure continuous operation, they need to be fully charged, which easily leads to overcharging, causing the battery pack to overheat and potentially explode, posing a safety hazard. Existing charging protection for lithium battery packs typically involves an external protective shell, which not only provides poor protection but also hinders heat dissipation. Furthermore, there are no warnings or corresponding protective measures for overheating during charging, preventing timely termination of charging and causing inconvenience. Therefore, improvements and optimizations are needed.

[0005] Therefore, this invention proposes a loader lithium battery charging protection system to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a lithium battery charging protection system for loaders to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a loader lithium battery charging protection system, including an overcharge protection cover and a lithium battery pack, wherein the lithium battery pack is fixedly installed on the overcharge protection cover, and a cable at one end of the lithium battery pack extends to the outside through the overcharge protection cover, and a temperature sensor is connected to the lithium battery pack, an alarm is connected to the outside of the overcharge protection cover, and a through groove is provided on the top of the overcharge protection cover.

[0008] An overcharge protection component is connected to the side of the through slot. The overcharge protection component protects the lithium battery pack from overcharge. The overcharge protection component includes a top overcharge protection component and a side overcharge protection component. The top overcharge protection component includes a top cover, a vent, a support rod, a support plate, a control telescopic rod, and a limiting plate. The side overcharge protection component includes a side cover, a rectangular hole, and a cover.

[0009] The connecting accessories include a movable sleeve, an auxiliary spring, a movable ring, an auxiliary pin, a threaded groove, an annular groove, a carrier plate, a limit plate, a first magnet block, a limit groove, a through groove, and a second magnet block.

[0010] The overcharge protection component provides auxiliary protection for the lithium battery pack through the auxiliary components. The auxiliary components include a first auxiliary component and a second auxiliary component. The first auxiliary component includes a splash-proof frame. The second auxiliary component includes a support frame, a round hole, a support post, a movable insert post, a protective spring, and a spherical shell cap.

[0011] Preferably, based on the actual space of the lithium battery pack, when there is sufficient space above it, the overcharge protection component is selected as the top overcharge protection component. The top cover is fixedly installed on the side of the through slot on the overcharge protection cover, and the four sides of the top cover are equidistantly provided with ventilation holes. A support rod is fixedly installed at the top of the top cover, and a support plate is fixedly installed at the top of the support rod. Control telescopic rods are symmetrically fixedly installed on both sides of the support plate, and a limit plate is welded to the bottom of the control telescopic rod.

[0012] Preferably, two control telescopic rods are symmetrically arranged on the support plate.

[0013] Preferably, based on the actual space of the lithium battery pack, when there is sufficient space on both sides, the overcharge protection component is selected as a side overcharge protection component. The overcharge protection cover is provided with a side groove, and a side cover is fixedly provided at the side position of the groove opening. Rectangular holes are provided at equal intervals on the upper and lower sides of the side cover, and a cover is fixedly provided at the side position of the opening of the rectangular hole.

[0014] Preferably, the opening of the cover faces the overcharge protection cover; and two side covers are symmetrically arranged on the overcharge protection cover.

[0015] Preferably, the movable sleeve is movably disposed at one end of the control telescopic rod, one end of the auxiliary spring is fixedly disposed on the limiting plate, and the other end is fixedly disposed with a movable ring. The movable ring is movably sleeved on the control telescopic rod, and the inner side wall of one end of the movable sleeve is provided with a connecting thread. The outer side wall of one end of the auxiliary pin is provided with a connecting thread and is threadedly connected to the threaded groove. The threaded groove is disposed on the carrier plate, and an annular groove is provided on the side of the threaded groove. The inner side wall of the annular groove is provided with a connecting thread and is threadedly connected to the movable sleeve. A limiting plate is fixedly disposed at one end of the carrier plate. First magnet blocks are symmetrically fixedly disposed on both sides of the limiting plate, and the limiting plate is adapted to and engaged with the limiting slot. A through groove is provided in the limiting slot, and the through groove is adapted to and inserted into the carrier plate. Second magnet blocks are symmetrically fixedly disposed in the limiting slot.

[0016] Preferably, the second magnet block and the first magnet block are positioned correspondingly and have the same number of sets, and they attract each other; the threaded groove and the annular groove are positioned correspondingly and have the same number of sets, and their center lines are on the same straight line.

[0017] Preferably, when the overcharge protection component is a top overcharge protection component, an auxiliary component is provided for it. When the auxiliary component is a first auxiliary component, the splash guard is fixedly installed at the bottom of the control telescopic rod by connecting accessories. The limiting slots are symmetrically arranged on both sides of the splash guard, and the through slot is installed through the splash guard. The inner side length of the splash guard is greater than the side length of the top cover. That is, when the splash guard moves down to the top cover position, the inner side wall of the splash guard does not contact the outer side wall and has a gap.

[0018] Preferably, when the second auxiliary component is selected, the splash-proof frame in the first auxiliary component is replaced with a support frame. The support frame is also fixedly installed at the bottom of the control telescopic rod by connecting accessories. The four side walls of the support frame are provided with circular holes at equal intervals, and support columns are fixedly installed at equal intervals on the sides of the circular holes. A movable insert is movably installed in the support column. A protective spring is fixedly installed at one end of the movable insert, and the other end of the protective spring is fixedly installed in the support column. The other end of the movable insert is fixedly installed on the end face of the spherical shell cap.

[0019] Preferably, the support frame is adapted to fit the top cover, that is, when the support frame moves down to the position of the top cover, the inner sidewall of the support frame contacts the outer sidewall of the top cover; and the circular holes on the support frame and the ventilation holes on the top cover are positioned correspondingly, have the same number of sets, and have the same diameter.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention primarily improves and optimizes overcharge protection during the charging process of lithium battery packs on loaders. Specifically, it utilizes a combination of a temperature sensor, an alarm, and an overcharge protection component. When overcharging occurs, the temperature of the lithium battery pack rises. The temperature sensor detects this and triggers the alarm, alerting the operator to disconnect the power. Simultaneously, the overcharge protection component activates, preventing or minimizing the risk of explosion during power disconnection. This provides overcharge protection, ensuring immediate intervention to stop charging. In various installation and usage scenarios, the combination of the top overcharge protection component with a first auxiliary component, the top overcharge protection component with a second auxiliary component, and the side overcharge protection component not only provides rapid warnings but also ensures proper heat dissipation during overcharge, effectively protecting the battery pack and enhancing its overcharge protection functionality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the front connection of the lithium battery charging protection structure of the loader of the present invention;

[0023] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the connection between the middle structures;

[0024] Figure 3 This is a top view of the loader lithium battery charging protection structure connection of the present invention;

[0025] Figure 4 This is a partial cross-sectional view showing the connection between the overcharge protection shield and the lithium battery pack structure of the present invention.

[0026] Figure 5 This is a bottom view of the internal structure of the overcharge protection cover of the present invention.

[0027] Figure 6 This is a partial cross-sectional view of the left side of the connection between the connecting accessory and the first auxiliary component structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the connection structure of the intermediate connecting parts;

[0029] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the connection structure between the central splash guard frame and connecting accessories;

[0030] Figure 9 This is a partial cross-sectional view of the connection between the connecting accessory and the first auxiliary component structure of the present invention, on the right side.

[0031] Figure 10For the present invention Figure 9 Enlarged schematic diagram of the connection between the middle structures;

[0032] Figure 11 This is a schematic diagram of the connection structure of the second auxiliary component of the present invention;

[0033] Figure 12 For the present invention Figure 11 Enlarged schematic diagram of the connection between the middle structures;

[0034] Figure 13 This is a partial sectional view of the connection structure of the second auxiliary component of the present invention;

[0035] Figure 14 This is a schematic diagram showing the structural connection between the overcharge protection cover and the side overcharge protection component of the present invention;

[0036] Figure 15 For the present invention Figure 14 Enlarged schematic diagram of the connection of the middle structure.

[0037] In the diagram: 1. Overcharge protection cover; 2. Lithium battery pack; 3. Temperature sensor; 4. Alarm; 5. Through slot; 6. Top overcharge protection component; 6. Top cover; 601. Vent hole; 602. Support rod; 603. Support plate; 604. Control telescopic rod; 605. Limiting plate; 606. Connecting accessories; 7. Movable sleeve; 701. Auxiliary spring; 702. Movable ring; 703. Auxiliary pin; 704. Threaded groove; 705. Annular groove; 706. Carrier plate; 707. Limiting plate; 708. First magnet block; 709. Limiting slot; 710. Through slot; 711. Second magnet block; 712. First auxiliary component; 8. Splash shield; 801. Second auxiliary component; 9. Support frame; 901. Round hole; 902. Support column; 903. Movable insert; 904. Protective spring; 905. Spherical shell cap; 906. Side overcharge protection component; 10. Side cover; 1001. Rectangular hole; 1003. Cover. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0039] Example 1: Please refer to Figure 1-15 A loader lithium battery charging protection system includes an overcharge protection cover 1 and a lithium battery pack 2. The lithium battery pack 2 is fixedly installed on the overcharge protection cover 1, and a cable at one end of the lithium battery pack 2 extends through the overcharge protection cover 1 to the outside. A temperature sensor 3 is connected to the lithium battery pack 2, an alarm 4 is connected to the outside of the overcharge protection cover 1, and a through groove 5 is provided on the top of the overcharge protection cover 1.

[0040] An overcharge protection cover 1 is connected to an overcharge protection component at the side of the through slot 5. The overcharge protection component protects the lithium battery pack 2 from overcharge. The overcharge protection component includes a top overcharge protection component 6 and a side overcharge protection component 10. The top overcharge protection component 6 includes a top cover 601, a vent 602, a support rod 603, a support plate 604, a control telescopic rod 605, and a limiting plate 606. The side overcharge protection component 10 includes a side cover 1001, a rectangular hole 1002, and a cover 1003.

[0041] Connecting accessory 7 includes a movable sleeve 701, an auxiliary spring 702, a movable ring 703, an auxiliary pin 704, a threaded groove 705, an annular groove 706, a carrier plate 707, a limiting plate 708, a first magnet block 709, a limiting groove 710, a through groove 711, and a second magnet block 712.

[0042] The overcharge protection component provides auxiliary protection for the lithium battery pack 2 through the auxiliary components. The auxiliary components include a first auxiliary component 8 and a second auxiliary component 9. The first auxiliary component 8 includes a splash-proof frame 801. The second auxiliary component 9 includes a support frame 901, a round hole 902, a support post 903, a movable insertion post 904, a protective spring 905, and a spherical shell cap 906.

[0043] During the charging process of lithium battery pack 2, if overcharging occurs, the temperature of lithium battery pack 2 will rise. At this time, temperature sensor 3 will sense the temperature and trigger alarm 4 to sound an alarm, reminding the staff to cut off the power. In addition, overcharge protection component 6 will be triggered to protect lithium battery pack 2 from overcharging, preventing explosion or reducing the damage caused by explosion during the power-off process. This achieves overcharge protection for lithium battery pack 2 and also protects the personal safety of the staff.

[0044] Example 2: Please refer to Figure 3-10 Based on Embodiment 1, and considering the actual space of the lithium battery pack 2, when there is sufficient space above it, the overcharge protection component is selected as the top overcharge protection component 6. The top cover 601 is fixedly installed on the side of the through groove 5 on the overcharge protection cover 1, and the four sides of the top cover 601 are equidistantly provided with ventilation holes 602. The top of the top cover 601 is fixedly provided with a support rod 603, and the top of the support rod 603 is fixedly provided with a support plate 604. The two sides of the support plate 604 are symmetrically fixedly provided with control telescopic rods 605, and the bottom of the control telescopic rod 605 is welded with a limit plate 606.

[0045] Two control telescopic rods 605 are symmetrically arranged on the support plate 604.

[0046] When the lithium battery pack 2 is overcharged, the control telescopic rod 605 will push down the splash guard 801, causing the splash guard 801 to cover the top cover 601, with a gap between the splash guard 801 and the top cover 601. This is to prevent fragments from flying out through the vents 602 on the top cover 601 after the lithium battery pack 2 explodes, and it will not affect the heat dissipation and cooling of the lithium battery pack 2 by the vents 602 on the top cover 601. The splash guard 801 can be disassembled through the connecting accessories 7, facilitating future maintenance and replacement. For the installation of the splash guard 801, first, it is slipped down from above the top cover 601. After reaching the appropriate position, the carrier plate 707 is inserted into the through groove 711 on the splash guard 801 until the limiting plate 708 is engaged in the limiting slot 710, and fixed by the mutual attraction of the first magnet 709 and the second magnet 712. One end of the auxiliary pin 704 is threaded and fixed in the threaded groove 705, and then one end of the movable sleeve 701 is threaded and fixed in the annular groove 706. At the same time, one end of the auxiliary pin 704 contacts the limiting plate 606 at the end of the control telescopic rod 605, and the auxiliary spring 702 and the movable ring 703 are squeezed by the movable sleeve 701. The auxiliary spring 702 is in a compressed state, and the movable sleeve 701 is highly stable under the rebound action of the auxiliary spring 702. The installation of the splash guard 801 can be completed quickly and the operation is simple. For its disassembly, simply loosen the movable sleeve 701 so that one end of the movable sleeve 701 separates from the annular groove 706 on the carrier plate 707. The fixed connection between the carrier plate 707 and the control telescopic rod 605 can be released. Then, loosen and remove the auxiliary pin 704, push out the carrier plate 707, and finally remove the splash guard 801.

[0047] Example 3: Please refer to Figure 11-13 Based on Embodiment 2, when the second auxiliary component 9 is selected as the auxiliary component, the splash-proof frame 801 in the first auxiliary component 8 is replaced with a support frame 901. The support frame 901 is also fixedly installed at the bottom end of the control telescopic rod 605 through the connecting accessory 7. The four side walls of the support frame 901 are provided with circular holes 902 at equal intervals, and the side positions of the circular holes 902 are fixedly provided with support columns 903 at equal intervals. The support column 903 is movably provided with a movable insert 904. One end of the movable insert 904 is fixedly provided with a protective spring 905, the other end of the protective spring 905 is fixedly installed in the support column 903, and the other end of the movable insert 904 is fixedly installed on the end face of the spherical shell cap 906.

[0048] The support frame 901 is adapted to fit the top cover 601, that is, when the support frame 901 moves down to the position of the top cover 601, the inner side wall of the support frame 901 contacts the outer side wall of the top cover 601; and the circular hole 902 on the support frame 901 and the ventilation hole 602 on the top cover 601 are positioned correspondingly, have the same number of sets, and have the same diameter.

[0049] The fixed connection method of the support frame 901 and the control telescopic rod 605 is the same as the connection method of the splash-proof frame 801 and the control telescopic rod 605. When the support frame 901 moves down to the position of the top cover 601, the two fit together, and the round hole 902 on the support frame 901 is aligned with the vent hole 602 on the top cover 601. This ensures heat dissipation when the lithium battery pack 2 is overcharged. A spherical shell cap 906 is set on the side of the round hole 902. The spherical shell cap 906 is elastically set through the cooperation of the support column 903, the movable insert 904, and the protective spring 905. That is, when the lithium battery pack 2 explodes due to overcharging, the spherical shell cap 906 can block the flying fragments and avoid injury to the surrounding personnel. While providing explosion protection, it also ensures heat dissipation for the lithium battery pack 2, giving the personnel enough time to cut off the power. This ensures the overcharge protection of the lithium battery pack 2, avoids explosion as much as possible, and minimizes the damage caused by overcharge explosion.

[0050] Example 4: Please refer to Figure 14-15 Based on Embodiment 3, according to the actual space of the lithium battery pack 2, when there is sufficient space on both sides, the overcharge protection component is selected as the side overcharge protection component 10. The overcharge protection cover 1 is provided with a side groove, and a side cover 1001 is fixedly provided at the side position of the groove opening. Rectangular holes 1002 are provided at equal intervals on the upper and lower sides of the side cover 1001, and a cover 1003 is fixedly provided at the side position of the opening of the rectangular hole 1002.

[0051] The cover opening of the cover 1003 faces the overcharge protection cover 1; and two side covers 1001 are symmetrically arranged on the overcharge protection cover 1.

[0052] The rectangular holes 1002 symmetrically arranged on the top and bottom of the side cover 1001 are used to ensure normal cooling when the lithium battery pack 2 is overcharged and heated, and to protect its normal operating temperature. A cover 1003 is provided at the opening of the rectangular hole 1002, with the opening of the cover 1003 facing the overcharge protection cover 1. In the event of an overcharge explosion, the flying fragments will not fly in all directions, thus protecting the personnel in the vicinity and improving the overcharge protection functionality of the lithium battery pack 2.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A loader lithium battery charging protection system, comprising an overcharge protection cover (1) and a lithium battery pack (2), wherein the lithium battery pack (2) is fixedly installed in the overcharge protection cover (1), and a cable at one end of the lithium battery pack (2) extends through the overcharge protection cover (1) to the outside, and a temperature sensor (3) is connected to the lithium battery pack (2), an alarm (4) is connected to the outside of the overcharge protection cover (1), and a through groove (5) is provided on the top of the overcharge protection cover (1); Its features are: An overcharge protection cover (1) is connected to an overcharge protection component at the side of the through slot (5). The overcharge protection component provides overcharge protection for the lithium battery pack (2). The overcharge protection component includes a top overcharge protection component (6) and a side overcharge protection component (10). The top overcharge protection component (6) includes a top cover (601), a vent (602), a support rod (603), a support plate (604), a control telescopic rod (605), and a limiting plate (606). The side overcharge protection component (10) includes a side cover (1001), a rectangular hole (1002), and a cover (1003). According to the actual space of the lithium battery pack (2), when there is sufficient space above it, the overcharge protection component is selected as the top overcharge protection component (6). The top cover (601) is fixedly installed on the side of the through groove (5) on the overcharge protection cover (1), and the four sides of the top cover (601) are equidistantly provided with ventilation holes (602). The top of the top cover (601) is fixedly provided with a support rod (603), the top of the support rod (603) is fixedly provided with a support plate (604), and the two sides of the support plate (604) are symmetrically fixedly provided with control telescopic rods (605). The bottom end of the control telescopic rod (605) is welded with a limit plate (606). The connecting fitting (7) includes a movable sleeve (701), an auxiliary spring (702), a movable ring (703), an auxiliary pin (704), a threaded groove (705), an annular groove (706), a carrier plate (707), a limiting plate (708), a first magnet (709), a limiting groove (710), a through groove (711), and a second magnet (712). The overcharge protection component provides auxiliary protection for the lithium battery pack (2) through the auxiliary components. The auxiliary components include a first auxiliary component (8) and a second auxiliary component (9). The first auxiliary component (8) includes a splash guard (801). The second auxiliary component (9) includes a support frame (901), a round hole (902), a support post (903), a movable insert post (904), a protective spring (905), and a spherical shell cap (906).

2. The loader lithium battery charging protection system according to claim 1, characterized in that: Two control telescopic rods (605) are symmetrically arranged on the support plate (604).

3. The loader lithium battery charging protection system according to claim 1, characterized in that: According to the actual space of the lithium battery pack (2), when there is sufficient space on both sides, the overcharge protection component is selected as the side overcharge protection component (10). The overcharge protection cover (1) is provided with a side groove, and a side cover (1001) is fixedly provided at the side position of the groove opening. Rectangular holes (1002) are provided at equal intervals on the upper and lower sides of the side cover (1001), and a cover (1003) is fixedly provided at the side position of the opening of the rectangular hole (1002).

4. The loader lithium battery charging protection system according to claim 3, characterized in that: The cover (1003) faces the overcharge protection cover (1); and two side covers (1001) are symmetrically arranged on the overcharge protection cover (1).

5. The loader lithium battery charging protection system according to claim 1, characterized in that: The movable sleeve (701) is movably mounted on one end of the control telescopic rod (605). One end of the auxiliary spring (702) is fixedly mounted on the limiting plate (606), and the other end is fixedly mounted with a movable ring (703). The movable ring (703) is movably sleeved on the control telescopic rod (605). The inner wall of one end of the movable sleeve (701) is provided with a connecting thread. The outer wall of one end of the auxiliary pin (704) is provided with a connecting thread and is threaded to the threaded groove (705). The threaded groove (705) is located on the carrier plate (707), and the side position of the threaded groove (705) is... An annular groove (706) is provided, and the inner wall of the annular groove (706) is provided with a connecting thread, which is adapted to the movable sleeve (701) for threaded connection. A limit plate (708) is fixedly provided at one end of the carrier plate (707). A first magnet block (709) is symmetrically fixed on both sides of the limit plate (708), and the limit plate (708) is adapted to the limit groove (710) for snap-fit. A through groove (711) is provided in the limit groove (710), and the through groove (711) is adapted to the carrier plate (707) for insertion. A second magnet block (712) is symmetrically fixed in the limit groove (710).

6. The loader lithium battery charging protection system according to claim 5, characterized in that: The second magnet block (712) is positioned in the same way as the first magnet block (709) and has the same number of sets, and the two attract each other; the threaded groove (705) and the annular groove (706) are positioned in the same way and have the same number of sets, and their center lines are on the same straight line.

7. The loader lithium battery charging protection system according to claim 1, characterized in that: When the overcharge protection component is selected as the top overcharge protection component (6), an auxiliary component is set for it. When the auxiliary component is selected as the first auxiliary component (8), the splash frame (801) is fixedly set at the bottom end of the control telescopic rod (605) by the connecting fitting (7). The limiting slot (710) is symmetrically set on both sides of the splash frame (801), and the through slot (711) is set through the splash frame (801). The inner side length of the splash frame (801) is greater than the side length of the top cover (601). That is, when the splash frame (801) moves down to the position of the top cover (601), the inner side wall of the splash frame (801) does not contact the outer side wall and has a gap.

8. The loader lithium battery charging protection system according to claim 1, characterized in that: When the second auxiliary component (9) is selected as the auxiliary component, the splash-proof frame (801) in the first auxiliary component (8) is replaced with the support frame (901). The support frame (901) is also fixedly installed at the bottom of the control telescopic rod (605) by the connecting fitting (7). The four side walls of the support frame (901) are provided with round holes (902) at equal intervals, and the side positions of the round holes (902) are provided with support columns (903) at equal intervals. The support column (903) is movably installed with a movable insert (904). One end of the movable insert (904) is fixedly installed with a protective spring (905), and the other end of the protective spring (905) is fixedly installed in the support column (903). The other end of the movable insert (904) is fixedly installed on the end face of the spherical shell cap (906).

9. A loader lithium battery charging protection system according to claim 8, characterized in that: The support frame (901) is adapted to fit the top cover (601), that is, when the support frame (901) moves down to the position of the top cover (601), the inner side wall of the support frame (901) contacts the outer side wall of the top cover (601); and the circular hole (902) on the support frame (901) and the ventilation hole (602) on the top cover (601) are set in corresponding positions, have the same number of sets, and have the same diameter.

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