Seat post battery and power-assisted bicycle

Abstract

The utility model relates to the technical field of seat post batteries, and discloses a seat post battery and a power-assisted bicycle, the seat post battery comprises an upper end cover assembly, a lower end cover assembly and a post body assembly. The upper end cover assembly is used for connecting a cushion; the lower end cover assembly is located below the upper end cover. The two ends of the pipe body assembly are connected to the upper end cover assembly and the lower end cover assembly respectively. According to the seat post battery disclosed by the utility model, the problem of difficulty in disassembly and assembly caused by mutual interference between the seat post battery and the seat cushion is avoided, and meanwhile, the problem that a power-assisted bicycle is unbalanced easily due to the fact that the battery pack is mounted on one side of the frame is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of seat tube batteries, in particular to a seat tube battery and a power-assisted bicycle. Background Art

[0002] A power-assisted bicycle is a new type of two-wheeled vehicle, a type of bicycle. It uses a battery as an auxiliary power source, is equipped with an electric motor, and has a power assist system. It is a new type of transportation tool that can integrate human riding and motor assistance.

[0003] In the prior art, power-assisted bicycles are provided with a battery pack for supplying energy to the motor. Typically, the battery pack is installed on one side of the frame, which can easily interfere with the seat during installation or removal, making assembly and disassembly difficult. Moreover, since the battery pack is installed on one side of the frame, the power-assisted bicycle can easily become unbalanced, and the installation of the battery pack occupies a large space, thereby affecting the user's riding experience.

[0004] Therefore, it is urgent to propose a seat tube battery and a power-assisted bicycle to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the present invention provides a seat tube battery and a power-assisted bicycle, which avoids the problem of interference between the seat tube battery and the seat, thereby making disassembly and assembly difficult, and also avoids the problem of imbalance of the power-assisted bicycle caused by the battery pack being installed on one side of the frame.

[0006] The technical effects to be achieved by the present invention are achieved through the following aspects:

[0007] In a first aspect, the present invention provides a seat tube battery, comprising:

[0008] An upper end cover assembly, used for connecting to a seat cushion;

[0009] a lower end cover assembly, located below the upper end cover; and

[0010] A tube body assembly, with two ends respectively connected to the upper end cover assembly and the lower end cover assembly;

[0011] In which, the upper end cover assembly includes an upper end cover body, a seat cushion connecting part, a locking structure and a connecting piece, the first end of the upper end cover body is connected to the tube body assembly, the seat cushion connecting part abuts against the second end of the upper end cover body away from the tube body assembly, the locking structure is used to lock the seat cushion connecting part on the upper end cover body, the connecting piece is simultaneously passed through the upper end cover body, the seat cushion connecting part and the locking structure from bottom to top, and the outer periphery of one end of the connecting piece away from the upper end cover body is provided with a threaded surface for screwing to the seat cushion.

[0012] In some implementations, the locking structure includes a locking member, and the locking member is provided with a first threaded hole that is threadedly connected to the threaded surface of the connecting member.

[0013] In this implementation, by rotating the locking member, the first threaded hole rotates relative to the threaded surface, so that the locking member can move along the connecting member, thereby pressing and fixing the seat cushion connecting part to the upper end cover or adjusting the distance between the seat cushion and the seat cushion connecting part.

[0014] In some implementations, a first orientation portion extends from the second end of the upper end cover body, and the seat cushion connecting portion is provided with a second orientation portion that cooperates with and is oriented to the first orientation portion; the first orientation portion includes a mounting groove, and the second orientation portion includes a protrusion that adapts to the mounting groove.

[0015] In this implementation, the mounting groove cooperates with the protrusion to securely mount the seat cushion connection portion to the upper end cover, thereby ensuring the connection stability between the upper end cover and the seat cushion connection portion.

[0016] In some implementations, the seat cushion connection portion includes an upper connecting block and a lower connecting block that are connected to each other, and a side of the lower connecting block facing away from the upper connecting block abuts against the upper end cover body, and the upper connecting block and the lower connecting block jointly form a mounting hole for fixing the seat cushion.

[0017] In some implementations, the tube assembly includes a shell, a battery cell module, and a circuit board. The battery cell module is disposed inside the shell, and the circuit board is disposed between the shell and the battery cell module.

[0018] In this implementation, the circuit board is arranged between the battery module and the shell and is electrically connected to the battery module, and is used to conduct the electrical energy of the battery module to the outside, thereby ensuring the reliability of the seat tube battery power supply.

[0019] In some implementations, the battery cell module includes multiple battery cells and a fixing frame, the fixing frame is provided with multiple battery cell mounting positions, and the multiple battery cells are respectively installed in the battery cell mounting positions, so that the multiple battery cells are arranged in a preset manner in the shell.

[0020] In some implementations, the upper cover assembly further includes a charge and discharge interface assembly and a mounting platform, wherein the mounting platform is disposed on a side surface of the upper cover body, and the mounting platform has a mounting plane perpendicular to a radial direction of the upper cover body; a mounting opening is provided on the mounting plane, and the charge and discharge interface assembly is mounted on the mounting plane and extends to the interior of the upper cover body through the mounting opening.

[0021] In this implementation, the bolts are more stable when they are simultaneously passed through the charge and discharge interface assembly and the mounting plane, thereby improving the stability of the structural assembly.

[0022] In some implementations, a seal is provided between the charge and discharge interface assembly and the mounting plane.

[0023] In some implementations, the lower end cover assembly includes a lower end cover body and a universal wheel, the lower end cover body is connected to the tube body assembly, and the universal wheel is connected to an end of the lower end cover body facing away from the tube body assembly.

[0024] In a second aspect, the utility model provides a power-assisted bicycle, comprising a frame and the above-mentioned seat tube battery, wherein the frame is provided with a battery mounting base for mounting the seat tube battery.

[0025] In summary, the present invention has at least the following advantages:

[0026] The seat tube battery provided by the present invention has a connecting piece that is simultaneously passed through the upper end cover body, the seat cushion connecting part and the locking structure from bottom to top, and a threaded surface is provided on the outer periphery of one end of the connecting piece away from the upper end cover body, which is screwed to the seat cushion of the power-assisted bicycle, so that the seat cushion is connected to the seat tube battery. In this way, the seat tube battery can be installed in the center of the power-assisted bicycle, and installation or removal is more convenient, avoiding the problem of mutual interference between the seat tube battery and the seat cushion, which makes installation and removal difficult, and also avoiding the problem of imbalance of the power-assisted bicycle caused by the battery pack being installed on one side of the frame. The overall structure is more compact and occupies less space, so it can be compatible with more power-assisted bicycles with small installation space for battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the seat tube battery structure of Example 1;

[0028] Figure 2 for Figure 1 A schematic cross-sectional view of the upper end cover assembly shown;

[0029] Figure 3 for Figure 1 A schematic structural diagram of the locking structure shown;

[0030] Figure 4 Schematic diagram of the seat tube battery structure of Example 2;

[0031] Figure 5 for Figure 4 The structural diagram of the installation platform shown;

[0032] Figure 6 for Figure 4 A schematic structural diagram of the lower end cover assembly shown;

[0033] Figure 7 for Figure 6 The structural schematic diagram of the second threaded hole is shown.

[0034] Markings in the figure:

[0035] 1. Upper end cover assembly; 11. Upper end cover body; 111. First orientation portion; 112. Mounting groove; 12. Cushion connection portion; 121. Second orientation portion; 122. Protrusion; 123. Upper connection block; 124. Lower connection block; 125. Mounting hole; 13. Locking structure; 131. Locking member; 132. First threaded hole; 14. Connecting member; 141. Threaded surface; 15. Control switch; 16. Charge and discharge interface assembly; 17. Mounting platform; 18. Mounting plane; 181. Mounting port; 19. Sealing member;

[0036] 2. Lower end cover assembly; 21. Lower end cover body; 211. Second threaded hole; 22. Universal wheel;

[0037] 3. Tube assembly; 31. Shell; 32. Cell module; 321. Cell; 322. Fixing bracket; 323. Cell mounting position; 33. Circuit board. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Please see the attached Figure 1 ~Attached Figure 3 The seat tube battery of the present invention includes an upper end cover assembly 1, a lower end cover assembly 2 and a tube body assembly 3.

[0042] Please combine Figure 1 and Figure 2 , Figure 1 The diagram shows the structural relationship between the upper end cover assembly 1, the lower end cover assembly 2 and the tube body assembly 3 in the embodiment of the present utility model. Figure 2The figure shows the specific structure of the upper end cover assembly 1 in the embodiment of the present invention. Specifically, the upper end cover assembly 1 is used to connect the seat cushion; the lower end cover assembly 2 is located below the upper end cover; and the two ends of the tube body assembly 3 are respectively connected to the upper end cover assembly 1 and the lower end cover assembly 2. Among them, the upper end cover assembly 1 includes an upper end cover body 11, a seat cushion connecting portion 12, a locking structure 13 and a connector 14. The first end of the upper end cover body 11 is connected to the tube body assembly 3, the seat cushion connecting portion 12 abuts against the second end of the upper end cover body 11 away from the tube body assembly 3, the locking structure 13 is used to lock the seat cushion connecting portion 12 on the upper end cover body 11, and the connector 14 is simultaneously provided through the upper end cover body 11, the seat cushion connecting portion 12 and the locking structure 13 from bottom to top. The outer periphery of the end of the connector 14 away from the upper end cover body 11 is provided with a threaded surface 141 for being screwed to the seat cushion.

[0043] In this embodiment, the tube assembly 3 is disposed between the upper end cover assembly 1 and the lower end cover assembly 2, and is used to provide power to the seat tube battery, thereby ensuring the reliability of the seat tube battery's power supply. A connector 14 is simultaneously disposed from bottom to top through the upper end cover 11, the seat connection portion 12, and the locking structure 13. A threaded surface 141 is provided on the outer periphery of the end of the connector 14 away from the upper end cover 11. The threaded surface 141 is threadedly engaged with the seat of the power-assisted bicycle, thereby securing the seat to the connector 14, and thus to the upper end cover assembly 1, further ensuring the reliability of the connection between the seat and the seat tube battery. The locking structure 13 is used to secure the seat connection portion 12 to the upper end cover 11 and can be moved relative to the seat connection portion 12 along the connector 14, thereby adjusting the position of the seat screwed to the connector 14, that is, adjusting the distance of the seat relative to the seat connection portion 12. This allows for adjustable seat height, making the power-assisted bicycle more suitable for different riders. When the seat tube battery is installed in a power-assisted bicycle, since the seat of the power-assisted bicycle is connected to the connector 14 of the seat tube battery, the seat tube battery can be installed in the center of the power-assisted bicycle, avoiding the problem of imbalance of the power-assisted bicycle caused by the battery pack being installed on one side of the frame.

[0044] The above-mentioned seat tube battery, the connecting member 14 is simultaneously penetrated from bottom to top through the upper end cover body 11, the seat cushion connecting part 12 and the locking structure 13, and the outer periphery of the end of the connecting member 14 away from the upper end cover body 11 is provided with a threaded surface 141, and the threaded surface 141 is screwed to the seat cushion of the power-assisted bicycle, so that the seat cushion is connected to the seat tube battery. In this way, the seat tube battery can be installed in the center of the power-assisted bicycle, and the installation or removal is more convenient, avoiding the problem of mutual interference between the seat tube battery and the seat cushion, which makes the disassembly and assembly difficult, and at the same time avoiding the problem of imbalance of the power-assisted bicycle caused by the battery pack being installed on one side of the frame, and the overall structure is more compact and occupies less space, so it can be compatible with more power-assisted bicycles with small battery pack installation space.

[0045] In some preferred embodiments, see Figure 3 , Figure 3 The diagram illustrates the structural relationship between the locking member 131 and the connecting member 14 in an embodiment of the present invention. Specifically, the locking structure 13 includes the locking member 131, which defines a first threaded hole 132 that is threadedly connected to a threaded surface 141 of the connecting member 14. By rotating the locking member 131, the first threaded hole 132 rotates relative to the threaded surface 141, allowing the locking member 131 to move along the connecting member 14. This allows the seat connection portion 12 to be pressed and fixed to the upper end cover 11, or the distance between the seat and the seat connection portion 12 to be adjusted. This ensures the reliability of the locking structure 13 and further makes the power-assisted bicycle more suitable for different riders.

[0046] In some preferred embodiments, please continue to see Figure 3 , Figure 3 The diagram illustrates the structural relationship between the first orientation portion 111 and the second orientation portion 121 in an embodiment of the present invention. Specifically, the first orientation portion 111 extends from the second end of the upper cover 11, and the seat cushion connection portion 12 is provided with a second orientation portion 121 that cooperates with the first orientation portion 111 for orientation. The first orientation portion 111 includes a mounting groove 112, and the second orientation portion 121 includes a protrusion 122 that adapts to the mounting groove 112. The mounting groove 112 cooperates with the protrusion 122 to achieve fixed installation of the seat cushion connection portion 12 on the upper cover 11, ensuring the stability of the connection between the upper cover 11 and the seat cushion connection portion 12. At the same time, the mounting groove 112 serves as a guide, facilitating the smooth installation of the seat cushion connection portion 12 on the upper cover 11, thereby improving assembly convenience.

[0047] Furthermore, the mounting groove 112 has a first anti-slip surface, and the protrusion 122 has a second anti-slip surface that cooperates with the first anti-slip surface to prevent slipping. The first anti-slip surface and the second anti-slip surface are both inclined in the same direction, thereby ensuring the compactness of the overall structure and the reliability of the connection.

[0048] In some more preferred embodiments, the seat cushion connection portion 12 includes an upper connection block 123 and a lower connection block 124 that are connected to each other, and the side of the lower connection block 124 facing away from the upper connection block 123 abuts against the upper end cover 11, and the upper connection block 123 and the lower connection block 124 jointly form a mounting hole 125 for fixing the seat cushion. The seat of the power-assisted bicycle is provided with a fixing member, which is passed through the mounting hole 125 to fix the seat cushion to the seat cushion connection portion 12, thereby ensuring the reliability of the connection between the seat cushion and the seat cushion connection portion 12. Preferably, the mounting holes 125 are symmetrically arranged, and the two fixing members are respectively passed through the two mounting holes 125 to ensure that the seat cushion can firmly support the weight of the rider, so that the seat cushion can maintain balance during riding and reduce the discomfort caused by bumps or turns. The fixing member can be a steel wire rope.

[0049] Example 2:

[0050] The difference between this embodiment and embodiment 1 is that this embodiment further optimizes the structure of the seat tube battery of the utility model. Figure 4 ~Attached Figure 7 .

[0051] Among them, see Figure 4 , Figure 4 The diagram illustrates the structural relationship between the housing 31, the battery module 32, and the circuit board 33 in the embodiment of the present invention. Specifically, the tube assembly 3 includes the housing 31, the battery module 32, and the circuit board 33. The battery module 32 is disposed inside the housing 31, and the circuit board 33 is disposed between the housing 31 and the battery module 32.

[0052] In this embodiment, the battery module 32 is housed within the housing 31, which protects the module from scratches and potential malfunctions. A circuit board 33 is located between the module and the housing 31 and is electrically connected to the module. This circuit board is used to transfer power from the module to the outside, thereby ensuring reliable power supply from the seat tube battery.

[0053] In some preferred embodiments, the battery module 32 includes multiple battery cells 321 and a mounting bracket 322. The mounting bracket 322 defines multiple battery cell mounting positions 323, and the multiple battery cells 321 are respectively mounted in the battery cell mounting positions 323, so that the multiple battery cells 321 are arranged in a predetermined manner within the housing 31. The mounting bracket 322 serves to secure the multiple battery cells 321, preventing interference and collision between the multiple battery cells 321, which could lead to malfunctions. Since the multiple battery cells 321 are arranged in a predetermined manner within the housing 31, the power supply reliability of the battery module 32 is ensured, thereby ensuring the reliability of the seat tube battery.

[0054] In some preferred embodiments, the upper cover 11 is provided with a control switch 15 electrically connected to the circuit board 33. By pressing the control switch 15, the circuit board 33 and the battery module 32 are electrically conductive, thereby enabling the battery module 32 to output electrical energy, thereby ensuring the reliability of the seat tube battery.

[0055] In some preferred embodiments, see Figure 5 , Figure 5The diagram illustrates the structural relationship between the upper cover body 11, the mounting platform 17, and the charge-discharge interface assembly 16 in an embodiment of the present invention. Specifically, the upper cover assembly 1 also includes a charge-discharge interface assembly 16 and a mounting platform 17. The mounting platform 17 is provided on the side of the upper cover body 11, and the mounting platform 17 has a mounting plane 18 perpendicular to the radial direction of the upper cover body 11; the mounting plane 18 is provided with a mounting opening 181, and the charge-discharge interface assembly 16 is mounted on the mounting plane 18 and extends to the interior of the upper cover body 11 through the mounting opening 181. This makes it more stable when the bolts are simultaneously passed through the charge-discharge interface assembly 16 and the mounting plane 18, thereby improving the stability of the structural assembly. Furthermore, the charge-discharge interface assembly 16 includes a charging interface and a discharging interface. The charging interface is used to connect to an external power source to replenish power for the seat tube battery, and the discharging interface is used to connect to the motor of the power-assisted bicycle to enable the motor to work normally, thereby ensuring the reliability of the power-assisted bicycle.

[0056] In some preferred embodiments, a seal 19 is provided between the charge and discharge interface assembly 16 and the mounting plane 18. This further improves the connection stability and sealing between the charge and discharge interface assembly 16 and the mounting plane 18, provides dust and water resistance, and prevents moisture from penetrating into the upper cover 11 and causing malfunctions.

[0057] In some more preferred embodiments, see Figure 6 , Figure 6 The diagram shows the structural relationship between the lower end cover 21 and the universal wheel 22 in an embodiment of the present invention. Specifically, the lower end cover assembly 2 includes the lower end cover 21 and the universal wheel 22. The lower end cover 21 is connected to the tube assembly 3, and the universal wheel 22 is connected to the end of the lower end cover 21 that is away from the tube assembly 3. When the seat tube battery is removed from the power-assisted bicycle, the operator can drag the seat tube battery to a place where it can be charged, which improves the convenience of use. It can be understood that due to the certain weight of the battery, by installing the universal wheel 22 on the lower end cover 21, the seat tube battery can be moved without lifting it, which is faster and more labor-saving when removing and charging. Please refer to Figure 7 Preferably, a second threaded hole 211 is opened from bottom to top at the center of the lower end cover body 21, and the universal wheel 22 is screwed into the second threaded hole 211. When the universal wheel 22 is damaged, it is convenient to replace the universal wheel 22.

[0058] Example 3:

[0059] This embodiment provides a power-assisted bicycle based on the above embodiments.

[0060] Among them, a power-assisted bicycle includes a frame and a seat tube battery, and the frame is provided with a battery mounting seat for mounting the seat tube battery.

[0061] In this embodiment, a battery mounting base is provided on the frame, a seat tube battery is installed in the battery mounting base, and the seat cushion is connected to the seat tube battery, so that the frame, seat tube battery and seat cushion are firmly connected, thereby ensuring the reliability of the power-assisted bicycle.

[0062] In the power-assisted bicycle of the present invention, a connecting member 14 is simultaneously passed through the upper end cover body 11, the seat cushion connecting portion 12 and the locking structure 13 from bottom to top, and a threaded surface 141 is provided on the outer periphery of one end of the connecting member 14 away from the upper end cover body 11. The threaded surface 141 is screwed to the seat cushion of the power-assisted bicycle, so that the seat cushion is connected to the seat tube battery. In this way, the seat tube battery can be centrally installed on the power-assisted bicycle, and installation or removal is more convenient, avoiding the problem of mutual interference between the seat tube battery and the seat cushion, which makes installation and removal difficult, and also avoiding the problem of imbalance of the power-assisted bicycle caused by the battery pack being installed on one side of the frame. The overall structure is more compact and occupies less space, so it can be compatible with more power-assisted bicycles with small battery pack installation space.

[0063] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0064] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0065] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0066] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] Although the present invention has been described with reference to the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, modifications and variations are included within the spirit and scope of the appended claims.

Claims

1. A seat tube battery, characterized in that: include: An upper end cover assembly (1) for connecting to a seat cushion; A lower end cover assembly (2), located below the upper end cover; as well as A tube body assembly (3), both ends of which are connected to the upper end cover assembly (1) and the lower end cover assembly (2) respectively; The upper end cover assembly (1) comprises an upper end cover body (11), a cushion connection portion (12), a locking structure (13) and a connecting piece (14); a first end of the upper end cover body (11) is connected to the tube body assembly (3); the cushion connection portion (12) abuts against a second end of the upper end cover body (11) away from the tube body assembly (3); the locking structure (13) is used to lock the cushion connection portion (12) on the upper end cover body (11); the connecting piece (14) is simultaneously passed through the upper end cover body (11), the cushion connection portion (12) and the locking structure (13) from bottom to top; and a threaded surface (141) for being screwed to the cushion is provided on the outer periphery of one end of the connecting piece (14) away from the upper end cover body (11).

2. The seat tube battery according to claim 1, characterized in that: The locking structure (13) comprises a locking member (131), wherein the locking member (131) is provided with a first threaded hole (132) threadedly connected to a threaded surface (141) of the connecting member (14).

3. The seat tube battery according to claim 1, characterized in that: A first orientation portion (111) extends from the second end of the upper end cover (11), and the cushion connecting portion (12) is provided with a second orientation portion (121) that cooperates with and is oriented to the first orientation portion (111); the first orientation portion (111) includes a mounting groove (112), and the second orientation portion (121) includes a protrusion (122) that is adapted to the mounting groove (112).

4. The seat tube battery according to claim 1, characterized in that: The seat cushion connection portion (12) comprises an upper connection block (123) and a lower connection block (124) connected to each other, and a side of the lower connection block (124) facing away from the upper connection block (123) abuts against the upper end cover (11), and the upper connection block (123) and the lower connection block (124) jointly form a mounting hole (125) for fixing the seat cushion.

5. The seat tube battery according to claim 1, characterized in that: The tube assembly (3) comprises a shell (31), a battery module (32) and a circuit board (33); the battery module (32) is arranged inside the shell (31), and the circuit board (33) is arranged between the shell (31) and the battery module (32).

6. The seat tube battery according to claim 5, characterized in that: The battery cell module (32) comprises a plurality of battery cells (321) and a fixing frame (322); the fixing frame (322) is provided with a plurality of battery cell mounting positions (323); the plurality of battery cells (321) are respectively mounted on the battery cell mounting positions (323), so that the plurality of battery cells (321) are arranged in a preset manner in the housing (31).

7. The seat tube battery according to claim 1, characterized in that: The upper end cover assembly (1) further comprises a charge and discharge interface assembly (16) and a mounting platform (17); the mounting platform (17) is arranged on a side surface of the upper end cover body (11), and the mounting platform (17) has a mounting plane (18) perpendicular to the radial direction of the upper end cover body (11); the mounting plane (18) is provided with a mounting opening (181); the charge and discharge interface assembly (16) is mounted on the mounting plane (18) and extends into the interior of the upper end cover body (11) through the mounting opening (181).

8. The seat tube battery according to claim 7, characterized in that: A sealing member (19) is provided between the charge and discharge interface assembly (16) and the mounting plane (18).

9. The seat tube battery according to claim 1, characterized in that: The lower end cover assembly (2) comprises a lower end cover body (21) and a universal wheel (22), wherein the lower end cover body (21) is connected to the tube body assembly (3), and the universal wheel (22) is connected to an end of the lower end cover body (21) facing away from the tube body assembly (3).

10. A power-assisted bicycle, characterized in that: The bicycle comprises a frame and a seat tube battery according to any one of claims 1 to 9, wherein the frame is provided with a battery mounting base for mounting the seat tube battery.

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