A high-performance lithium battery pack suitable for low-altitude unmanned aerial vehicles

Abstract

The application relates to the technical field of unmanned aerial vehicle battery packs, in particular to a high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles, which comprises a row of main-position batteries connected in series, standby batteries distributed on one side of the row of main-position batteries, a series connection line group used for realizing series connection of the circuit of the row of main-position batteries, a temperature detector installed on each main-position battery, a pressure device used for establishing connection between the series connection line group and the temperature detector, a double connection line group connected to the standby batteries, and a battery replacement device used for realizing power supply switching of the main-position batteries and the standby batteries; if a single main-position battery fails and overheats, the standby battery can automatically replace the overheated main-position battery to ensure that the series circuit is stable and supplies power to the unmanned aerial vehicle; if the series circuit fails and loses power, the unmanned aerial vehicle falls in the air, and the weightlessness falling condition of the unmanned aerial vehicle is detected by a weightlessness detection rod; the standby battery can automatically trigger emergency power supply to the unmanned aerial vehicle, so that the unmanned aerial vehicle can safely fly and land.

Description

Technical Field

[0001] This invention relates to the field of drone battery technology, specifically to a high-efficiency lithium battery pack suitable for low-altitude drones. Background Technology

[0002] The main shortcomings of existing drone battery packs include short battery life, limited flight time, long charging time, and safety issues. These shortcomings mainly stem from factors such as battery technology, operating environment, and user operation. During low-altitude drone flight, if the battery pack malfunctions and stops supplying power, the drone will fall directly into the air, potentially causing damage and property loss, or injuring people or damaging important objects. If the drone battery pack had an automatic recharging function, it would automatically trigger emergency recharging when the drone falls, allowing it to land slowly and avoiding the safety problems associated with a direct fall. Furthermore, the short battery life of drones is a significant issue. Drone batteries are easily affected by environmental factors during use; for example, overheating can cause batteries to bulge, expand, or even crack. If the emergency recharging battery could automatically replace the overheated working battery in the battery pack, it could prevent the safety problems caused by the working battery continuously overheating. Summary of the Invention

[0003] The purpose of this invention is to provide a high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles (UAVs) to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles, comprising a row of main batteries connected in series, backup batteries distributed on one side of the row of main batteries, a series wire group for realizing the series connection of the main batteries, a temperature sensor installed on each main battery, a pressure device for establishing a connection between the series wire group and the temperature sensor, a double-wire group connected to the backup batteries, and a battery swapping device for realizing the power supply switching between the main batteries and the backup batteries, wherein the battery swapping device includes:

[0005] F-type frame, one end of which is externally fixed to the outer casing of the battery pack;

[0006] The F-frame upper limit support gear switching device, the gear switching device realizes emergency power supply of backup battery through switching circuit, and the pressure device intercepts and locks the gear switching device;

[0007] The weightlessness detection bar installed on the gear shifting device senses the weightlessness of the drone when it loses power in mid-air, thereby adjusting the drive of the gear shifting device and triggering the gear shifting device's switching circuit.

[0008] The series wire group includes:

[0009] A cross-frame connector group is provided between the two electrode connectors on each main battery.

[0010] The middle section conductor connecting two adjacent cross-bracket joint groups, the first incoming conductor connected to one end of a row of cross-bracket joint groups, and the first loop conductor connected to the other end of a row of cross-bracket joint groups.

[0011] Two first external conductors are distributed at the external terminals of the first incoming conductor and the first loop conductor.

[0012] The dual-connection group includes:

[0013] A second inlet wire connected to the positive terminal of the backup battery and a second outlet wire connected to the negative terminal of the backup battery;

[0014] The backup battery has two branch wires connected to its two electrode terminals, and the two branch wires are connected to a cross-branch connector group to enable the backup battery to supply power to replace the single primary battery.

[0015] Two second external conductors are distributed at the external terminals of the second incoming conductor and the second loop conductor.

[0016] The crossbar connector assembly includes an insulating crossbar, L-shaped conductive posts fixed at both ends of the insulating crossbar, and S-shaped conductive springs fixedly connected to each L-shaped conductive post. Multiple S-shaped conductive springs are also fixedly connected to the ends of the middle section conductor, the first incoming conductor, or the first return conductor nearby. The L-shaped conductive posts can be moved to selectively connect between the branch conductor and the main battery electrode connector.

[0017] The pressure device includes a fixed frame column with one end fixed to an F-type frame, a movable frame column that locks onto a gear shifting device, a row of unit square columns supported on the fixed frame column, a round locking column fixed at one end of each unit square column, a tension spring fitted on each round locking column, and a pressure dividing group correspondingly set at one end of each round locking column. The tension spring is supported between the unit square column and the movable frame column. The other end of each unit square column is connected to a thermometer. The unit square column slides through a square hole opened on the fixed frame column, and the round locking column slides through a cylindrical hole opened on the movable frame column.

[0018] The temperature sensor includes a plate frame fixedly connected to the unit column, a deformable rod with one end in contact with the plate frame, and a semi-column frame for binding and limiting the deformable rod. The semi-column frame is fixed to the outer shell of the main battery and has space left inside for the deformable rod to expand and deform thermally. A row of deformable rods is provided on both sides of the main battery plate. The deformable rods push the plate frame by thermal expansion.

[0019] The pressure device also includes multiple T-shaped columns and a corresponding return spring on each T-shaped column. One end of the T-shaped column is fixed to the fixed frame column, and the T-shaped column slides through the cylindrical hole opened on the movable frame column. The other end of the T-shaped column is provided with a disc, and the return spring is supported between the disc of the T-shaped column and the movable frame column.

[0020] The pressure-dividing assembly includes a sub-frame fixed to a fixed column, a multi-control plate supported on the sub-frame, and a pressure-control spring with one end resting on the multi-control plate. The other end of the pressure-control spring is fixed to the sub-frame. One side of the multi-control plate slides through a square hole in the sub-frame via a first protruding plate. The multi-control plate contacts the middle of the insulating crossbar via an inclined surface. The insulating crossbar slides through a plate hole in the sub-frame via a flat plate. The other side of the multi-control plate rests against the outer wall of a circular locking post via a second protruding plate. The circular locking post has a plate hole for the insertion of the second protruding plate of the multi-control plate.

[0021] The gear shifting device includes a concave frame that slides through a hole in an F-shaped frame plate, a pull control spring piece fixed at one end to the concave frame, an L-shaped locking plate that slides through a hole in the concave frame, and two concave conductive spring pieces fixed at both ends of the concave frame. One end of the movable frame column intercepts the L-shaped locking plate, and the other end of the pull control spring piece is fixed to the F-shaped frame. The concave frame moves to control the concave conductive spring pieces originally connected between the first external conductor and the first circuit conductor and the concave conductive spring pieces connected between the first incoming conductor and the first external conductor to move away synchronously. The concave frame also moves to control a concave conductive spring piece to be connected between the second circuit conductor and the second external conductor, and a concave conductive spring piece to be connected between the second incoming conductor and the second external conductor.

[0022] The weightlessness detection rod includes a worm gear that is meshed with a row of teeth on an L-plate, a tube fixed on a concave frame, a weight ball, a piston rod and a compression spring disposed in the tube, and a U-shaped frame that establishes a transmission between the piston rod and the worm gear. One end of the worm gear is movably sleeved in a through hole opened on the concave frame.

[0023] The piston rod is slidably disposed in the tube. A row of stacked heavy balls is disposed at the upper end of the piston rod. An anti-compression spring is supported between the lower end of the piston rod and the intercepting ring disposed in the tube. One end of the U-shaped frame is fixed to the piston rod, and the other end of the U-shaped frame is connected to the shaft gear disposed on the worm gear by a row of teeth.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention uses a series of primary batteries connected in series to power the drone. If a single primary battery fails and overheats, the backup battery will automatically replace the overheated primary battery to ensure that the series circuit provides stable power to the drone. If the series circuit fails and loses power, the drone will fall from the sky. The drone's weightlessness and fall will be detected by the weightlessness detection rod, which will automatically trigger the backup battery to provide emergency power to the drone, ensuring that the drone can fly and land safely.

[0026] 2. If multiple primary batteries in the series circuit overheat unexpectedly, the replacement mechanism of the backup battery will not be automatically triggered. The damage caused by the overheating of multiple primary batteries is difficult to control. Therefore, the series circuit is directly powered off, and the backup battery is put into emergency power supply on its own. In this way, the drone can fly and land safely. Regardless of whether the backup battery is in the series circuit, the backup battery will automatically be triggered to supply power independently when the drone crashes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram showing the location of the main battery.

[0029] Figure 3 This is a schematic diagram of the battery swapping device.

[0030] Figure 4 This is a schematic diagram of a series wire group structure.

[0031] Figure 5 This is a schematic diagram of the crossbeam joint assembly structure.

[0032] Figure 6 This is a schematic diagram of the branch conductor location.

[0033] Figure 7 This is a schematic diagram of the pressure device.

[0034] Figure 8 This is a schematic diagram of the temperature sensor structure.

[0035] Figure 9 This is a schematic diagram of the pressure divider assembly.

[0036] Figure 10 This is a schematic diagram of a fixed-column structure.

[0037] Figure 11 This is a schematic diagram of the gear shifting device.

[0038] Figure 12 This is a schematic diagram of the weightlessness detection rod structure.

[0039] Figure 13 This is a schematic diagram of a U-shaped frame structure.

[0040] In the diagram: 1. Main battery; 2. Backup battery; 3. Series connection group; 4. Temperature sensor; 5. Pressure device; 6. Battery swapping device; 7. F-frame; 8. Gear shifting device; 9. Weightlessness detection rod; 10. Double wiring group; 11. Horizontal frame connector group; 12. Middle section conductor; 13. First incoming conductor; 14. First circuit conductor; 15. Second incoming conductor; 16. Second circuit conductor; 17. Branch conductor; 18. Second external conductor; 19. S-type conductive spring; 20. Insulating crossbar; 21. L 22. Conductive post 23. Pressure divider group 24. Round clamp post 25. Force spring 26. T-shaped post 27. Return spring 28. Fixed frame post 29. Unit square post 30. Flexible frame post 31. Half column long frame 32. Deformable rod 32. Plate frame 33. Sub-frame 34. Multi-control plate 35. Pressure control spring 36. L-shaped clamp plate 37. Pull control spring 38. Concave frame 39. Concave conductive spring 40. Weight ball 41. Tube 42. Piston post 43. Compression spring 44. Worm gear 45. U-shaped frame 46. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 13 This invention provides a technical solution: a high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles, comprising a row of main batteries 1 connected in series, backup batteries 2 distributed on one side of the row of main batteries 1, a series wire group 3 for realizing the series circuit of the row of main batteries 1, a temperature sensor 4 installed on each main battery 1, a pressure device 5 establishing a connection between the series wire group 3 and the temperature sensor 4, a double wire group 10 connected to the backup batteries 2, and a battery swapping device 6 for realizing the power supply switching between the main batteries 1 and the backup batteries 2, the battery swapping device 6 comprising:

[0043] F-type bracket 7, one end of which is externally fixed to the outer casing of the battery pack;

[0044] The F-type frame 7 provides upper limit support for the gear shifting device 8. The gear shifting device 8 uses a switching circuit to provide emergency power to the backup battery 2. The pressure device 5 intercepts and blocks the gear shifting device 8.

[0045] The weightlessness detection rod 9 installed on the gear shifting device 8 adjusts the drive gear shifting device 8 by sensing the weightlessness of the drone when it loses power in the air, thereby triggering the switching circuit of the gear shifting device 8.

[0046] refer to Figure 4 Understood, series line group 3 includes:

[0047] A cross-bracing connector group 11 is provided between the two electrode connectors on each main battery 1;

[0048] The middle section conductor 12 connecting two adjacent cross frame joint groups 11, the first incoming conductor 13 connected to one end of a row of cross frame joint groups 11, and the first loop conductor 14 connected to the other end of a row of cross frame joint groups 11.

[0049] Two first external conductors 15 are distributed at the external terminals of the first incoming conductor 13 and the first loop conductor 14.

[0050] refer to Figure 4 Understood, the dual-connection group 10 includes:

[0051] The second inlet wire 16 is connected to the positive terminal of the backup battery 2 and the second outlet wire 17 is connected to the negative terminal of the backup battery 2;

[0052] Two branch wires 18 are also connected to the two electrode connectors of the backup battery 2, and the two branch wires 18 are connected to a cross frame connector group 11 to realize the backup battery 2 to supply power to replace the single main battery 1.

[0053] Two second external conductors 19 are distributed at the external terminals of the second incoming conductor 16 and the second loop conductor 17.

[0054] The UAV battery pack of this invention adopts a series connection. The series connection can provide the required higher voltage to meet the high current demand of the UAV, while the parallel connection has limitations in meeting the high current demand. In this invention, a row of main batteries 1 supplies power to the UAV through a series connection group 3, and the backup battery 2 is also connected to the UAV's flight drive mechanism through a double connection group 10. Under normal circumstances, the backup battery 2 does not supply power to the flight mechanism. The main batteries 1 and the backup battery 2 supply power to the UAV's flight drive mechanism independently. When a row of main batteries 1 is engaged in power supply, if a main battery 1 fails, the series circuit stops supplying power, and the UAV crashes in the air. The weightlessness is detected by the weightlessness detection rod 9, which automatically triggers the backup battery 2 to provide emergency power. In this way, the UAV can restore power in the air and land safely and slowly. In addition, if any main battery 1 overheats, the replacement mechanism will be automatically triggered, and the backup battery 2 will automatically replace the overheated main battery 1 and be engaged in the series circuit.

[0055] refer to Figure 5Understandably, the crossbar connector assembly 11 includes an insulating crossbar 21, L-shaped conductive posts 22 fixed at both ends of the insulating crossbar 21, and S-shaped conductive springs 20 fixedly connected to each L-shaped conductive post 22. Multiple S-shaped conductive springs 20 are also fixedly connected to the ends of the middle section conductor 12, the first incoming conductor 13, or the first return conductor 14 nearby. The L-shaped conductive posts 22 can be moved to selectively connect between the branch conductor 18 and the electrode connector of the main battery 1.

[0056] refer to Figure 7 The pressure device 5 includes a fixed frame column 28 with one end fixed to the F-type frame 7, a movable frame column 30 that engages with the gear shifting device 8, a row of unit square columns 29 supported on the fixed frame column 28, a round locking column 24 fixed at one end of the unit square column 29, a tension spring 25 fitted on each round locking column 24, and a pressure dividing group 23 correspondingly set at one end of the round locking column 24. The tension spring 25 is supported between the unit square column 29 and the movable frame column 30. The other end of each unit square column 29 is connected to a temperature sensor 4. The unit square column 29 slides through the square hole opened on the fixed frame column 28, and the round locking column 24 slides through the cylindrical hole opened on the movable frame column 30.

[0057] refer to Figure 8 The temperature sensor 4 includes a plate frame 33 fixedly connected to the unit column 29, a deformable rod 32 with one end in contact with the plate frame 33, and a semi-column frame 31 that binds and limits the deformable rod 32. The semi-column frame 31 is fixed to the outer shell of the main battery 1 and has space left inside for the thermal expansion and deformation of the deformable rod 32. A row of deformable rods 32 is provided on both sides of the main battery 1. The deformable rods 32 push the plate frame 33 by thermal expansion and elongation.

[0058] The pressure device 5 also includes a plurality of T-shaped columns 26, and a return spring 27 corresponding to each T-shaped column 26. One end of the T-shaped column 26 is fixed to the fixed frame column 28, and the T-shaped column 26 slides through the cylindrical hole opened on the movable frame column 30. The other end of the T-shaped column 26 is provided with a disc, and the return spring 27 is supported between the disc of the T-shaped column 26 and the movable frame column 30.

[0059] The pressure dividing assembly 23 includes a dividing frame 34 fixed on a fixed frame column 28, a multi-control plate 35 supported on the dividing frame 34, and a pressure control spring 36 with one end resting on the multi-control plate 35. The other end of the pressure control spring 36 is fixed on the dividing frame 34. One side of the multi-control plate 35 slides through a square hole opened on the dividing frame 34 by a first protrusion plate. The multi-control plate 35 contacts the middle of the insulating cross column 21 by an inclined surface. The insulating cross column 21 slides through a plate hole opened on the dividing frame 34 by a flat plate. The other side of the multi-control plate 35 abuts against the outer wall of the circular locking post 24 by a second protrusion plate. The circular locking post 24 has a plate hole for the insertion of the second protrusion plate of the multi-control plate 35.

[0060] The gear shifting device 8 includes a concave frame 39 that slides through the hole in the F-type frame 7, a pull control spring 38 fixed at one end to the concave frame 39, an L-type card plate 37 that slides through the hole in the concave frame 39, and two concave conductive springs 40 fixed at both ends of the concave frame 39. One end of the movable frame column 30 intercepts the L-type card plate 37, and the other end of the pull control spring 38 is fixed to the F-type frame 7. The concave frame 39 moves to control the concave conductive springs 40 originally connected between the first external conductor 15 and the first circuit conductor 14 and the concave conductive springs 40 connected between the first incoming conductor 13 and the first external conductor 15 to leave synchronously. The concave frame 39 also moves to control a concave conductive spring 40 to be connected between the second circuit conductor 17 and the second external conductor 19, and a concave conductive spring 40 to be connected between the second incoming conductor 16 and the second external conductor 19.

[0061] The weightlessness detection rod 9 includes a worm gear 45 that is meshed and connected to a row of teeth on the L-plate 37, a tube 42 fixed on the concave frame 39, a weight ball 41, a piston column 43 and a compression spring 44 disposed in the tube 42, and a U-shaped frame 46 that establishes a transmission between the piston column 43 and the worm gear 45. One end of the worm gear 45 is movably sleeved in a through hole opened on the concave frame 39.

[0062] The piston column 43 is slidably disposed in the tube 42. A row of stacked heavy balls 41 is disposed at the upper end of the piston column 43. The anti-compression spring 44 is supported between the lower end of the piston column 43 and the intercepting ring disposed in the tube 42. One end of the U-shaped frame 46 is fixed on the piston column 43, and the other end of the U-shaped frame 46 is connected to the shaft gear disposed on the worm 45 by a row of teeth.

[0063] When the primary battery 1 overheats, it affects the two deformation rods 32. The deformation rods 32 are made of a material that expands and contracts with temperature changes, as is common in the prior art. The deformation rods 32 expand and elongate when heated, pushing the plate frame 33. The plate frame 33 then drives the unit square column 29, which in turn drives the round locking column 24 to move axially. When the plate hole on the round locking column 24 is fully exposed below the second protrusion of the multi-control plate 35, the second protrusion of the multi-control plate 35, under the pressure of the pressure control spring 36, inserts into the plate hole of the round locking column 24. The multi-control plate 35 then pushes the insulating horizontal column 21, which in turn drives the L-shaped conductive columns 22 at both ends. (Reference) Figure 5 The two L-shaped conductive posts 22 move synchronously to the right, and each L-shaped conductive post 22 is connected to a corresponding branch wire 18. In this way, the series circuit includes the branch wire 18 and the backup battery 2. Figure 5 The primary battery 1 on the left side will be shielded from the series circuit, so that the backup battery 2 will automatically replace the overheated primary battery 1 and be put into the series power supply circuit.

[0064] The above describes the replacement process for a single overheated primary battery 1. If other primary batteries 1 overheat, this replacement process will not occur because the damage caused by multiple overheated primary batteries 1 is uncontrollable. Therefore, the entire series circuit will stop supplying power, and instead, backup battery 2 will start supplying power independently. In this way, backup battery 2 will take over the work, providing low-power power to the drone's flight drive mechanism, allowing the drone to descend safely and slowly. The principle is as follows: if multiple primary batteries 1 overheat... Figure 7 Multiple unit columns 29 will translate and push the tension springs 25. The multiple tension springs 25 are compressed, thus providing a stronger thrust, causing the frame column 30 to translate to the right, triggering subsequent interception release. Previously, when a single main battery 1 overheated, the thrust generated by the compression of a single tension spring 25 was small and did not trigger subsequent interception release. Interception release refers to... Figure 11 After the movable frame column 30 in the middle is moved, it no longer locks the L-plate 37. In this way, the concave frame 39 drives the L-plate 37 to move to the right. The external terminals of the second incoming line wire 16 and the second circuit wire 17 are successfully connected, while the external terminals of the first incoming line wire 13 and the first circuit wire 14 are disconnected from the outside world. Thus, the series circuit loses its function, the backup battery 2 is connected to the external circuit, and the backup battery 2 begins to supply power to the drone.

[0065] Regardless of whether the backup battery 2 replaces the single overheated primary battery 1, if the weightlessness detection rod 9 detects that the drone is falling and experiencing weightlessness, the backup battery 2 immediately and independently supplies power to the drone, thereby ensuring that the drone regains its flight capability and then slowly flies to a landing. The principle is that during normal flight, the stacked heavy balls 41 compress the piston rod 43, while during the drone's fall and weightlessness, the heavy balls 41 are in a weightless state within the tube 42. Thus, the piston rod 43 is reset and moved under the push of the anti-compression spring 44. Figure 12 The piston rod 43 rises to drive the U-shaped frame 46 to move, which in turn drives the worm gear 45 to rotate. The worm gear 45 controls the L-plate 37 to move horizontally. After the L-plate 37 moves horizontally, it no longer blocks the movable frame rod 30. Thus, the concave frame 39 moves horizontally under the pressure of the pull control spring 38, causing the second incoming wire 16 and the second circuit wire 17 to be successfully energized at their external terminals, while the first incoming wire 13 and the first circuit wire 14 are disconnected from the power supply.

[0066] Compared to existing temperature detectors that use electrical signals to power backup batteries, this invention's mechanical control eliminates the dependence on electricity. If the drone loses power, causing the detector to lose power, the battery swapping function will also fail. Furthermore, the drone has a limited battery capacity, so it is necessary to concentrate the power supply to the flight drive mechanism as much as possible.

[0067] The battery swapping in this invention is completed instantly. The key to the switching is that the multi-control board 35 is instantly inserted into the hole on the round card post 24, the main control battery is disconnected, and then the branch circuit is immediately connected.

[0068] When the drone falls due to weightlessness, the heavy ball can still play a stable role, and the heavy ball immediately loses its pressure on the piston rod 43.

[0069] 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 high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles, characterized in that: The system includes a row of primary batteries connected in series, backup batteries distributed on one side of the primary batteries, a series wiring group for connecting the primary batteries in series, a temperature sensor installed on each primary battery, a pressure device establishing a connection between the series wiring group and the temperature sensor, a double wiring group connected to the backup batteries, and a battery swapping device for switching power supply between the primary and backup batteries. The battery swapping device includes: F-type frame, one end of which is externally fixed to the outer casing of the battery pack; The F-frame upper limit support gear switching device, the gear switching device realizes emergency power supply of backup battery through switching circuit, and the pressure device intercepts and locks the gear switching device; The weightlessness detection bar installed on the gear shifting device senses the weightlessness of the drone when it loses power in the air, thereby adjusting the drive of the gear shifting device and triggering the gear shifting device's switching circuit. The pressure device includes a fixed frame column with one end fixed to an F-type frame, a movable frame column that locks onto a gear shifting device, a row of unit square columns supported on the fixed frame column, a round locking column fixed at one end of each unit square column, a tension spring fitted on each round locking column, and a pressure dividing group correspondingly set at one end of each round locking column. The tension spring is supported between the unit square column and the movable frame column. The other end of each unit square column is connected to a thermometer. The unit square column slides through a square hole opened on the fixed frame column, and the round locking column slides through a cylindrical hole opened on the movable frame column. The temperature measuring device includes a plate frame fixedly connected to the unit square column, a deformable rod with one end in contact with the plate frame, and a semi-column long frame for binding and limiting the deformable rod. The semi-column long frame is fixed on the outer shell of the main battery and has space left inside for the thermal expansion and deformation of the deformable rod. A row of deformable rods is provided on both sides of the plate surface of the main battery. The deformable rods push the plate frame by thermal expansion and elongation. The pressure device also includes multiple T-shaped columns and a corresponding return spring on each T-shaped column. One end of the T-shaped column is fixed to the fixed frame column, and the T-shaped column slides through the cylindrical hole opened on the movable frame column. The other end of the T-shaped column is provided with a disc, and the return spring is supported between the disc of the T-shaped column and the movable frame column. The pressure-dividing assembly includes a sub-frame fixed on a fixed frame column, a multi-control plate supported on the sub-frame, and a pressure-control spring piece with one end resting on the multi-control plate. The other end of the pressure-control spring piece is fixed on the sub-frame. One side of the multi-control plate slides through a square hole opened in the sub-frame via a first protrusion plate. The multi-control plate contacts the middle of the insulating cross column via an inclined surface. The insulating cross column slides through a plate hole opened in the sub-frame via a flat plate. The other side of the multi-control plate rests against the outer wall of the circular locking post via a second protrusion plate. The circular locking post has a plate hole for the insertion of the second protrusion plate of the multi-control plate. The gear shifting device includes a concave frame that slides through the hole in the F-shaped frame plate, a pull control spring piece fixed at one end to the concave frame, an L-shaped card plate that slides through the hole in the concave frame plate, and two concave conductive spring pieces fixed at both ends of the concave frame. One end of the movable frame column is locked to intercept the L-shaped card plate, and the other end of the pull control spring piece is fixed to the F-shaped frame.

2. The high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 1, characterized in that: The series wire group includes: A cross-frame connector group is provided between the two electrode connectors on each main battery. The middle section conductor connecting two adjacent cross-bracket joint groups, the first incoming conductor connected to one end of a row of cross-bracket joint groups, and the first loop conductor connected to the other end of a row of cross-bracket joint groups. Two first external conductors are distributed at the external terminals of the first incoming conductor and the first loop conductor.

3. A high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 2, characterized in that: The dual-connection group includes: A second inlet wire connected to the positive terminal of the backup battery and a second outlet wire connected to the negative terminal of the backup battery; Two branch wires are also connected to the two electrode terminals of the backup battery, and the two branch wires are connected to a cross-branch connector group to enable the backup battery to supply power to replace the single main battery. Two second external conductors are distributed at the external terminals of the second incoming conductor and the second loop conductor.

4. A high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 3, characterized in that: The crossbar connector assembly includes an insulating crossbar, L-shaped conductive posts fixed at both ends of the insulating crossbar, and S-shaped conductive springs fixedly connected to each L-shaped conductive post. Multiple S-shaped conductive springs are also fixedly connected to the ends of the middle section conductor, the first incoming conductor, or the first return conductor nearby. The L-shaped conductive posts are selectively connected between the branch conductor and the main battery electrode connector by moving.

5. A high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 4, characterized in that: The concave frame moves to control the concave conductive spring originally connected between the first outer conductor and the first circuit conductor, and the concave conductive spring connected between the first incoming conductor and the first outer conductor to move away synchronously. The concave frame also moves to control a concave conductive spring to be connected between the second circuit conductor and the second outer conductor, and a concave conductive spring to be connected between the second incoming conductor and the second outer conductor.

6. A high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 5, characterized in that: The weightlessness detection rod includes a worm gear that is meshed with a row of teeth on an L-plate, a tube fixed on a concave frame, a weight ball, a piston rod and a compression spring disposed in the tube, and a U-shaped frame that establishes a transmission between the piston rod and the worm gear. One end of the worm gear is movably sleeved in a through hole opened on the concave frame.

7. A high-efficiency lithium battery pack suitable for low-altitude unmanned aerial vehicles according to claim 6, characterized in that: The piston rod is slidably disposed in the tube. A row of stacked heavy balls is disposed at the upper end of the piston rod. An anti-compression spring is supported between the lower end of the piston rod and the intercepting ring disposed in the tube. One end of the U-shaped frame is fixed to the piston rod, and the other end of the U-shaped frame is connected to the shaft gear disposed on the worm gear by a row of teeth.

Images