Barrel type battery pack

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a cylindrical battery pack which comprises a cylinder, and a battery module, a first limiting assembly, a second limiting assembly and a circumferential limiting mechanism which are arranged in the cylinder, a gap is formed between the outer surface of the battery module and the inner wall of the cylinder, and the size of the battery module in the axial direction of the cylinder is smaller than the axial length of the cylinder; the circumferential limiting mechanism is arranged in a gap between the battery module and the cylinder, and the circumferential limiting mechanism is used for limiting the relative position of the battery module and the cylinder in the radial direction of the cylinder; the first limiting assembly and the second limiting assembly are connected with the cylinder, and the first limiting assembly and the second limiting assembly clamp the battery module through the two axial ends of the cylinder. According to the barrel-shaped battery pack provided by the embodiment of the invention, the square-block-shaped battery modules are assembled into the barrel-shaped cylinder to form the barrel-shaped battery pack, so that the industry blank is filled.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a cylindrical battery pack. Background Art

[0002] Many battery modules are usually composed of multiple flat battery cells, making the battery module in the shape of a cuboid or a cube. The battery module is installed in the battery pack. Due to the shape of the battery module and the difficulty of assembly, the battery pack is slightly larger in size than the battery module.

[0003] Currently, square battery packs cannot be applied to all scenarios, especially in some cases where a cylindrical battery pack is required. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: on the premise that the shape of the battery module remains unchanged, there is a lack of a cylindrical battery pack in the industry. The present invention provides a cylindrical battery pack.

[0005] To solve the above technical problem, an embodiment of the present invention provides a cylindrical battery pack, including a cylindrical tube with both ends open, and a battery module, a first limiting component, a second limiting component and a circumferential limiting mechanism arranged in the cylindrical tube;

[0006] There is a gap between the outer surface of the battery module and the inner wall of the cylindrical tube, and the dimension of the battery module along the axial direction of the cylindrical tube is smaller than the axial length of the cylindrical tube;

[0007] The circumferential limiting mechanism is arranged in the gap between the battery module and the cylindrical tube, and the circumferential limiting mechanism is used to define the relative position between the battery module and the cylindrical tube in the radial direction of the cylindrical tube;

[0008] The first limiting component and the second limiting component are connected to the cylindrical tube, and the first limiting component and the second limiting component clamp the battery module from both axial ends of the cylindrical tube to hold the battery module in the cylindrical tube.

[0009] Optionally, the side wall of the first end of the cylindrical tube is bent towards its central axis to form a first retaining ring;

[0010] The side wall of the second end of the cylindrical tube is bent towards its central axis to form a second retaining ring;

[0011] The first limiting component is in abutting cooperation with the first retaining ring;

[0012] The second limiting component is in abutting cooperation with the second retaining ring.

[0013] Optionally, a plurality of limiting strips surrounding the central axis of the cylindrical tube are arranged at both ends of the cylindrical tube, and the plurality of limiting strips are fixed on the inner wall of the cylindrical tube;

[0014] The first limiting component includes a first cover plate and a plurality of first arc rings. The first arc rings are provided with limiting grooves adapted to the limiting strips. The first arc rings are inserted on the cylinder through the limiting grooves. The plurality of first arc rings are arranged around the cylinder. The first arc rings are arranged between the first retaining ring and the battery module. The opposite two side surfaces of the first arc rings are respectively used for abutting and cooperating with the battery module and the first retaining ring;

[0015] The outer peripheral wall of the first cover plate abuts the inner ring surface of the first arc rings. The first cover plate connects the first arc rings, so that the first cover plate is arranged within the intervals of the plurality of first arc rings close to the central axis of the cylinder;

[0016] The second limiting component includes a second cover plate and a plurality of second arc rings. The second arc rings are provided with clamping grooves adapted to the limiting strips. The second arc rings are inserted on the cylinder through the clamping grooves. The plurality of second arc rings are arranged around the cylinder. The second arc rings are arranged between the second retaining ring and the battery module. The opposite two side surfaces of the second arc rings are respectively used for abutting and cooperating with the battery module and the second retaining ring;

[0017] The outer peripheral wall of the second cover plate abuts the inner ring surface of the second arc rings. The second cover plate connects the second arc rings, so that the second cover plate is arranged within the intervals of the plurality of second arc rings close to the central axis of the cylinder.

[0018] Optionally, there are two first arc rings, and the sum of the radian of the two first arc rings is less than 360 degrees. The two first arc rings are symmetrically distributed at the first end of the battery module. The first cover plate connects the two first arc rings respectively;

[0019] There are four second arc rings, and the sum of the radian of the four second arc rings is less than 360 degrees. The second arc rings are evenly distributed at the second end of the battery module. The first cover plate connects the four second arc rings.

[0020] Optionally, the first arc ring includes a first inner arc ring and a first outer arc ring arranged along the axial direction of the cylinder. The first inner arc ring and the first outer arc ring are fixedly connected or integrally formed. The first inner arc ring is arranged on the side of the first outer arc ring away from the first retaining ring;

[0021] The outer ring surfaces of the first inner arc ring and the first outer arc ring both abut against the inner wall of the cylinder. The inner ring surface of the first inner arc ring is closer to the central axis of the cylinder than the inner edge of the first retaining ring. The outer peripheral wall of the first cover plate fits against the inner ring surface of the first outer arc ring. The surface of the first cover plate close to the battery module fits against the surface of the first inner arc ring away from the battery module. The first cover plate is detachably connected to the first inner arc ring.

[0022] Optionally, the second arc ring includes a second inner arc ring and a second outer arc ring. The second inner arc ring is disposed on the side of the second outer arc ring close to the battery module. The surface of the second inner arc ring away from the battery module abuts against the surface of the second outer arc ring close to the battery module.

[0023] The inner ring surface of the second inner arc ring is closer to the central axis of the cylinder than the inner edge of the second retaining ring.

[0024] The outer peripheral wall of the second cover plate fits against the inner ring surface of the second outer arc ring. The surface of the second cover plate close to the battery module fits against the surface of the second inner arc ring away from the battery module. The second cover plate is detachably connected to the second inner arc ring.

[0025] Optionally, first sub-card slots are respectively provided on the sides of the plurality of first inner arc rings close to the battery module. The plurality of first sub-card slots form a first card slot for one end of the battery module to be inserted.

[0026] The second inner arc ring is provided with second sub-card slots on the side close to the battery module. The plurality of second sub-card slots form a second card slot for the other end of the battery module to be inserted.

[0027] Optionally, the circumferential limiting mechanism includes a plurality of limiting plates and a plurality of buffer rings. The limiting plates and the buffer rings are in one-to-one correspondence. The plurality of limiting plates are evenly distributed along the length direction of the battery module.

[0028] The limiting plate is a circular plate. A through hole is provided in the middle of the limiting plate. The limiting plate is sleeved outside the battery module. The buffer ring is sleeved on the limiting plate. The outer surface of the buffer ring abuts against the inner wall of the cylinder.

[0029] Optionally, an installation groove is provided on the outer peripheral wall of the limiting plate. A part of the buffer ring is embedded in the installation groove.

[0030] Optionally, the limiting plate includes two sub-plates. The sub-plates are semi-circular. Sub-holes are provided on the sub-plates. The two sub-plates are spliced to form the limiting plate. The sub-holes on the two sub-plates are spliced to form the through hole on the limiting plate. The sub-plates are detachably connected to the battery module.

[0031] According to the cylindrical battery pack of the embodiment of the present invention, without changing the shape of the square battery module, the battery module is assembled into a cylindrical barrel, and finally a cylindrical battery pack is formed, which fills the gap in the industry. Brief Description of the Drawings

[0032] Figure 1 is an overall schematic diagram of the cylindrical battery pack provided by the first embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the internal structure of the barrel of the cylindrical battery pack provided by the first embodiment of the present invention;

[0034] Figure 3 is a semi-sectional schematic diagram of the barrel of the cylindrical battery pack provided by the first embodiment of the present invention;

[0035] Figure 4 is an overall semi-sectional schematic diagram of the cylindrical battery pack provided by the first embodiment of the present invention;

[0036] Figure 5 is a first perspective schematic diagram of the first limiting component and the second limiting component of the cylindrical battery pack provided by the first embodiment of the present invention;

[0037] Figure 6 is a first perspective exploded schematic diagram of the first limiting component and the second limiting component of the cylindrical battery pack provided by the first embodiment of the present invention;

[0038] Figure 7 is a second perspective schematic diagram of the first limiting component and the second limiting component of the cylindrical battery pack provided by the first embodiment of the present invention;

[0039] Figure 8 is a second perspective exploded view of the first limiting component and the second limiting component of the cylindrical battery pack provided by the first embodiment of the present invention.

[0040] The reference numerals in the specification are as follows:

[0041] 1, barrel; 11, first retaining ring; 12, first protruding ring; 13, second retaining ring; 14, second protruding ring; 15, limiting strip; 2, battery module; 3, first arc ring; 31, first inner arc ring; 32, first outer arc ring; 33, first card slot; 34, limiting slot; 4, first cover plate; 5, second arc ring; 51, second inner arc ring; 52, second outer arc ring; 53, second card slot; 54, clamping slot; 6, second cover plate; 7, limiting plate; 71, sub-plate; 72, mounting slot; 8, guiding hole. Detailed Description of the Embodiment

[0042] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] First Embodiment

[0044] As Figure 1 , Figure 2 and Figure 3 shown, a cylindrical battery pack provided by the first embodiment of the present invention includes a cylinder 1 with openings at both ends and a battery module 2, a first limiting component, a second limiting component and a circumferential limiting mechanism arranged in the cylinder 1; the cylinder 1 is in a cylindrical shape, the inside of the cylinder 1 is hollow, one end of the cylinder is the first end, and the other end is the second end. There is a gap between the outer surface of the battery module 2 and the inner wall of the cylinder 1, and the length of the battery module 2 is less than the length of the cylinder 1. The battery module 2 is in a cuboid or cube shape, and the length direction of the battery module 2 is the same as the length direction of the cylinder 1 (the central axis direction of the cylinder 1).

[0045] The circumferential limiting mechanism is arranged in the gap between the battery module 2 and the cylinder 1, and the circumferential limiting mechanism is used to limit the relative position between the battery module 2 and the cylinder 1 in the radial direction of the cylinder 1. The first limiting component and the second limiting component are respectively arranged at both ends of the cylinder 1 and sandwich the battery module 2, and the first limiting component and the second limiting component are connected to the cylinder 1 to maintain the battery module 2 in the cylinder 1.

[0046] The battery module 2 of the prior art and its outer shell are both square, which is convenient for assembly. Also for the reason of convenient assembly, there is a lack of production equipment for cylindrical battery modules 2 in the industry, which makes the processing and assembly difficulty of the cylindrical battery module 2 rise sharply. In this embodiment, without changing the shape of the battery module 2, a cylindrical battery pack is assembled to fill the industry gap.

[0047] In this embodiment, the circumferential limiting mechanism includes a plurality of limiting plates 7 and a plurality of buffer rings. The limiting plates 7 and the buffer rings correspond one by one, and the plurality of limiting plates 7 are evenly distributed along the length direction of the battery module 2. The limiting plate 7 is a circular plate, and a through hole is provided in the middle of the limiting plate 7 so that the limiting plate 7 is sleeved outside the battery module 2, the buffer ring is sleeved outside the limiting plate 7, and the outer surface of the buffer ring abuts against the inner wall of the cylinder 1. An installation groove 72 is provided on the outer peripheral wall of the limiting plate 7, and a part of the buffer ring is embedded in the installation groove 72.

[0048] Referring to Figure 3 and Figure 4, in this embodiment, the battery module 2 and the inner wall of the cylinder 1 are arranged at intervals. During the assembly process and the use process, especially during the use process, the battery module 2 is prone to bending or shaking, so that the battery module 2 collides with the cylinder 1, generating noise. Seriously, the cylinder 1 is damaged. Therefore, in this embodiment, the limiting plate 7 and the buffer ring are used to fix the relative position of the battery module 2 in the cylinder 1 unchanged, reducing the occurrence of the above adverse phenomena.

[0049] For the convenience of assembly, the limiting plate 7 includes two sub-plates 71. The sub-plates 71 are semicircular. Sub-holes are provided on the sub-plates 71. The two sub-plates 71 are spliced to form the limiting plate 7. The sub-holes on the two sub-plates 71 are spliced to form the through-hole on the limiting plate 7. The sub-plates 71 are detachably connected to the battery module 2. In this embodiment, the two sub-plates 71. During the assembly process, the two sub-plates 71 are spliced from the up and down directions respectively. A buffer ring is sleeved outside the two sub-plates 71 to avoid hard contact between the limiting plate 7 and the inner wall of the cylinder 1.

[0050] Further, holes are provided on the lower sub-plate 71 for the slide rail to penetrate during the assembly process, accelerating the assembly.

[0051] Refer to Figure 3 , in this embodiment, the end side wall of the first end of the cylinder 1 is bent towards its central axis to form a first retaining ring 11. The first retaining ring 11 is perpendicular to the inner wall of the cylinder 1. Then the first retaining ring 11 is bent again in the direction away from the battery module 2 to obtain a protruding ring 12. The protruding ring 12 and the inner wall of the cylinder 1 are coaxial, and the outer diameter of the protruding ring 12 is naturally smaller than the inner wall of the cylinder 1. The inner diameter of the first retaining ring 11 can allow the battery module 2 to pass through. Similarly, a second retaining ring 13 and a second protruding ring 14 are formed at the end of the second end of the cylinder 1. The first limiting component and the second limiting component are arranged at both ends of the cylinder 1 and inside the cylinder 1. The first limiting component is in blocking cooperation with the first retaining ring 11, and the second limiting component is in blocking cooperation with the second retaining ring 13 to prevent the battery module 2 from detaching from the two ends of the cylinder 1.

[0052] In this embodiment, a plurality of limiting strips 15 surrounding the central axis of the cylinder 1 are provided at both ends of the cylinder 1. The plurality of limiting strips 15 are fixed on the inner wall of the cylinder 1; the first limiting component includes a first cover plate 4 and a plurality of first arc rings 3. The first arc rings 3 are provided with limiting grooves 34 adapted to the limiting strips 15. The first arc rings 3 are inserted on the cylinder 1. The plurality of first arc rings 3 are arranged around the cylinder 1. The first arc rings 3 are arranged between the first retaining ring 11 and the battery module 2. The opposite two side surfaces of the first arc rings 3 are respectively used for blocking cooperation with the battery module 2 and the first retaining ring 11.

[0053] Refer to Figure 4 , Figure 5 and Figure 6, the limiting groove 34 on the first arc ring 3 cooperates with the limiting strip 15 on the inner wall of the cylinder 1 to prevent the first arc ring 3 from sliding along the inner wall of the cylinder 1, so that the position of the first arc ring 3 relative to the inner wall of the cylinder 1 remains fixed. The first arc ring 3 is arranged between the battery module 2 and the first retaining ring 11. In this embodiment, the cross-section of the battery module 2 is smaller than that of the first retaining ring 11, and the battery module 2 will not break away from the first end of the cylinder 1 due to the blocking of the first arc ring 3.

[0054] Refer to Figure 4 , Figure 7 and Figure 8 Similarly, the battery module 2 will not break away from the second end of the cylinder 1 due to the blocking of the second arc ring 5, which is specifically as follows: The second limiting component includes a second cover plate 6 and a plurality of second arc rings 5. The second arc ring 5 is provided with a clamping groove 54 adapted to the limiting strip 15. The second arc ring 5 is inserted on the cylinder 1 through the clamping groove 54. A plurality of second arc rings 5 are arranged around the cylinder 1. The second arc ring 5 is arranged between the second retaining ring 13 and the battery module 2. The opposite two side surfaces of the second arc ring 5 are respectively used for blocking and cooperating with the battery module 2 and the second retaining ring 13.

[0055] Refer to Figure 5 and Figure 6 , the outer peripheral wall of the first cover plate 4 abuts against the inner ring surface of the first arc ring 3, and the first cover plate 4 is connected to the first arc ring 3, so that the first cover plate 4 is arranged within the interval close to the central axis of the cylinder 1 of the plurality of first arc rings 3. Moreover, the first cover plate 4 further closes the opening of the first retaining ring 11. Not only that, the first cover plate 4 also plays a role in connecting the plurality of first arc rings 3, making the plurality of first arc rings 3 an integral whole.

[0056] Similarly, the outer peripheral wall of the second cover plate 6 abuts against the inner ring surface of the second arc ring 5, and the second cover plate 6 is connected to the second arc ring 5, so that the second cover plate 6 is arranged within the interval close to the central axis of the cylinder 1 of the plurality of second arc rings 5.

[0057] Refer to Figure 5 and Figure 6 , in this embodiment, there are two first arc rings 3, the sum of the radian measures of the two first arc rings 3 is less than 360 degrees, and the two first arc rings 3 are symmetrically distributed on both sides of the first end of the battery module 2. The first cover plate 4 is respectively connected to the two first arc rings 3. There are four second arc rings 5, the sum of the radian measures of the four second arc rings 5 is less than 360 degrees, the four second arc rings 5 are evenly distributed at the second end of the battery module 2, the four second arc rings 5 are arranged around the axial direction of the cylinder 1, and the first cover plate 4 is connected to the four second arc rings 5.

[0058] The reason why there are multiple first arc rings 3 in this embodiment instead of using a single first arc ring 3 with a major arc is as follows: The inner diameters of both the first arc ring 3 and the second arc ring 5 are larger than the inner diameter of the retaining ring 11. If a single first arc ring 3 is used, it cannot enter the inner wall of the cylinder 1 through the opening of the first retaining ring 11. The same applies to the second arc ring 5.

[0059] In this embodiment, the first arc ring 3 includes a first inner arc ring 31 and a first outer arc ring 32 arranged along the axial direction of the cylinder 1. The first inner arc ring 31 and the first outer arc ring 32 are fixedly connected or integrally formed, and the first inner arc ring 31 is arranged on the side of the first outer arc ring 32 away from the first retaining ring 11. The outer ring surfaces of both the first inner arc ring 31 and the first outer arc ring 32 abut against the inner wall of the cylinder 1. The inner ring surface of the first inner arc ring 31 is closer to the central axis of the cylinder 1 than the inner ring surface of the first inner arc ring 31. The outer peripheral wall of the first cover plate 4 fits against the inner ring surface of the first outer arc ring 32, and the surface of the first cover plate 4 close to the battery module 2 fits against the surface of the first inner arc ring 31 away from the battery module 2. The first cover plate 4 is detachably connected to the first inner arc ring 31.

[0060] The second arc ring 5 includes a second inner arc ring 51 and a second outer arc ring 52. The second inner arc ring 51 is arranged on the side of the second outer arc ring 52 close to the battery module 2, and the surface of the second inner arc ring 51 away from the battery module 2 abuts against the surface of the second outer arc ring 52 close to the battery module 2;

[0061] The inner ring surface of the second inner arc ring 51 is closer to the central axis of the cylinder 1 than the inner ring surface of the second outer arc ring 52; The outer peripheral wall of the second cover plate 6 fits against the inner ring surface of the second outer arc ring 52, and the surface of the second cover plate 6 close to the battery module 2 fits against the surface of the second inner arc ring 51 away from the battery module 2. The second cover plate 6 is detachably connected to the second inner arc ring 51.

[0062] Although the first arc ring 3 and the second arc ring 5 in this embodiment have similar structures, the first inner arc ring 31 and the first outer arc ring 32 are fixedly connected, while the second inner arc ring 51 and the second outer arc ring 52 are only in abutment. This difference is mainly due to assembly reasons. In this embodiment, the first arc ring 3 is first placed into the first end of the cylinder 1, then the battery module 2 is placed, and finally the second inner arc ring 51 is placed at the second end of the cylinder 1. After each second inner arc ring 51 is placed, a second outer arc ring 52 is placed accordingly. Therefore, the first inner arc ring 31 and the first outer arc ring 32 are pre-placed into the cylinder 1 as a whole, and after the battery module 2 is placed into the cylinder 1, the second inner arc ring 51 and the second outer arc ring 52 can be placed quickly in this sequential manner. Only a gentle tap on the second outer arc ring 52 is needed to make the second outer arc ring 52 fit into the space between the second retaining ring 13 and the second inner arc ring 51.

[0063] Refer to Figure 7 and Figure 8, in this embodiment, on the side of the plurality of first inner arc rings 31 close to the battery module 2, first sub-card slots are respectively provided, and the plurality of first sub-card slots form a first card slot 33 for the first end of the battery module 2 to be snapped into; refer to Figure 4 and Figure 5 , on the side of the second inner arc ring 51 close to the battery module 2, second sub-card slots are provided, and the plurality of second sub-card slots form a second card slot 53 for the end of the second end of the battery module 2 to be snapped into.

[0064] In this embodiment, the first card slot 33 and the second card slot 53 have the same function, that is, the first arc ring 3 and the second arc ring 5 limit the battery module 2 to prevent the battery from shaking randomly.

[0065] In this embodiment, the first inner arc ring 31, the first cover plate 4, the second inner arc ring 51, the second cover plate 6, and the limiting plate 7 are respectively provided with a plurality of guiding holes 8. The plurality of guiding holes 8 are respectively arranged at the four corners of the first inner arc ring 31, the second inner arc ring 51, and the limiting plate 7. The guiding holes 8 on the first inner arc ring 31, the second inner arc ring 51, and the limiting plate 7 located in the same corner are coaxial. The function of the guiding holes 8 is to facilitate the penetration of external devices to define the specific positions of the first inner arc ring 31, the second inner arc ring 51, and the limiting plate 7 in the cylinder 1 and prevent offset.

[0066] Refer to Figure 2 and Figure 4 , finally, the assembly process in this embodiment is described: after the cylinder 1 is fixed to the external device, first place the first arc ring 3 at the first end of the cylinder 1 and connect the first cover plate 4, then place the sub-board 71 at the second end of the cylinder 1, and use a rod-shaped external device (referred to as a guiding rod) to coaxially align the guiding holes 8 on the first arc ring 3 and the guiding holes 8 on the sub-board 71 and penetrate the guiding rod. At this time, the sub-board 71 will not rotate relative to the inner wall of the cylinder 1;

[0067] Assemble the slide rail, pass the slide rail through the holes of the lower sub-board 71, hoist the battery module 2 on the slide rail, and use the slide rail to pass the battery module 2 into the cylinder 1 from the second end and abut against the first arc ring 3; during the process of feeding the battery module 2 by the slide rail, every time the battery module 2 moves a certain distance, connect a pair of upper and lower distributed sub-boards 71 to the battery module 2 by bolts respectively, and the pair of upper and lower distributed sub-boards 71 are spliced into a limiting plate 7;

[0068] After the battery module 2 abuts against the first arc ring 3, place the second inner arc ring 51. After placing each second inner arc ring 51, then place the corresponding second outer arc ring 52, and use equipment such as a rubber hammer to knock the second outer arc ring 52 into the interval between the second retaining ring 13 and the second inner arc ring 51. Finally, connect the second cover plate 6 so that the second cover plate 6 and the plurality of second inner arc rings 51 are connected into a whole. Thus, the cylindrical battery pack is assembled.

[0069] After removing the external devices, specifically, remove the slide rail and the guide rod.

[0070] Finally, seal the cylinder 1 according to customer requirements.

[0071] Second Embodiment

[0072] The barrel-shaped battery pack according to the second embodiment of the present invention is different from the first embodiment in that the first arc ring or the second arc ring is three and is arranged around the central axis of the cylinder at an interval of 120 degrees.

[0073] Third Embodiment

[0074] The barrel-shaped battery pack according to the second embodiment of the present invention is different from the first embodiment in that the outer diameter of the limiting plate in this embodiment is smaller than the diameter of the first retaining ring or the second retaining ring, and the gap between the limiting plate and the inner wall of the cylinder is compensated by a buffer ring.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylindrical battery pack, characterized in that, It includes a cylinder with both ends open, as well as a battery module, a first limiting component, a second limiting component and a circumferential limiting mechanism arranged inside the cylinder; There is a gap between the outer surface of the battery module and the inner wall of the cylinder, and the dimension of the battery module along the axial direction of the cylinder is smaller than the axial length of the cylinder; The circumferential limiting mechanism is arranged in the gap between the battery module and the cylinder, and the circumferential limiting mechanism is used to define the relative position between the battery module and the cylinder in the radial direction of the cylinder; The first limiting component and the second limiting component are connected to the cylinder, and the first limiting component and the second limiting component sandwich the battery module from both axial ends of the cylinder to hold the battery module in the cylinder.

2. The cylindrical battery pack according to claim 1, characterized in that, The side wall of the first end of the cylinder bends towards its central axis to form a first retaining ring; The side wall of the second end of the cylinder bends towards its central axis to form a second retaining ring; The first limiting component is in a blocking fit with the first retaining ring; The second limiting component is in a blocking fit with the second retaining ring.

3. The cylindrical battery pack according to claim 2, characterized in that, A plurality of limiting strips surrounding the central axis of the cylinder are arranged at both ends of the cylinder, and the plurality of limiting strips are fixed on the inner wall of the cylinder; The first limiting component includes a first cover plate and a plurality of first arc rings. The first arc rings are provided with limiting grooves adapted to the limiting strips. The first arc rings are inserted on the cylinder through the limiting grooves. The plurality of first arc rings are arranged around the cylinder. The first arc rings are arranged between the first retaining ring and the battery module. The opposite side surfaces of the first arc rings are respectively used for blocking and cooperating with the battery module and the first retaining ring; The outer peripheral wall of the first cover plate abuts against the inner ring surface of the first arc ring, and the first cover plate is connected to the first arc ring, so that the first cover plate is arranged in the interval close to the central axis of the cylinder among the plurality of first arc rings; The second limiting component includes a second cover plate and a plurality of second arc rings. The second arc rings are provided with clamping grooves adapted to the limiting strips. The second arc rings are inserted on the cylinder through the clamping grooves. The plurality of second arc rings are arranged around the cylinder. The second arc rings are arranged between the second retaining ring and the battery module. The opposite side surfaces of the second arc rings are respectively used for blocking and cooperating with the battery module and the second retaining ring; The outer peripheral wall of the second cover plate abuts against the inner ring surface of the second arc ring, and the second cover plate is connected to the second arc ring, so that the second cover plate is arranged in the interval close to the central axis of the cylinder among the plurality of second arc rings.

4. The cylindrical battery pack according to claim 1, characterized in that, There are two first arc rings, and the sum of the radian measures of the two first arc rings is less than 360 degrees. The two first arc rings are symmetrically distributed at the first end of the battery module, and the first cover plate is respectively connected to the two first arc rings; There are four second arc rings, and the sum of the radian measures of the four second arc rings is less than 360 degrees. The second arc rings are evenly distributed at the second end of the battery module, and the first cover plate is connected to the four second arc rings.

5. The cylindrical battery pack according to claim 1, characterized in that, The first arc ring includes a first inner arc ring and a first outer arc ring arranged along the axial direction of the cylinder. The first inner arc ring and the first outer arc ring are fixedly connected or integrally formed. The first inner arc ring is arranged on the side of the first outer arc ring away from the first retaining ring. The outer ring surfaces of both the first inner arc ring and the first outer arc ring abut against the inner wall of the cylinder. The inner ring surface of the first inner arc ring is closer to the central axis of the cylinder than the inner edge of the first retaining ring. The outer peripheral wall of the first cover plate fits against the inner ring surface of the first outer arc ring. The surface of the first cover plate close to the battery module fits against the surface of the first inner arc ring away from the battery module. The first cover plate is detachably connected to the first inner arc ring.

6. The cylindrical battery pack according to claim 1, characterized in that, The second arc ring includes a second inner arc ring and a second outer arc ring. The second inner arc ring is arranged on the side of the second outer arc ring close to the battery module. The surface of the second inner arc ring away from the battery module abuts against the surface of the second outer arc ring close to the battery module. The inner ring surface of the second inner arc ring is closer to the central axis of the cylinder than the inner edge of the second retaining ring. The outer peripheral wall of the second cover plate fits against the inner ring surface of the second outer arc ring. The surface of the second cover plate close to the battery module fits against the surface of the second inner arc ring away from the battery module. The second cover plate is detachably connected to the second inner arc ring.

7. The cylindrical battery pack according to claim 1, characterized in that, On the side of the plurality of first inner arc rings close to the battery module, first sub-card slots are respectively provided. The plurality of first sub-card slots form a first card slot for the first end of the battery module to be inserted. On the side of the second inner arc ring close to the battery module, second sub-card slots are provided. The plurality of second sub-card slots form a second card slot for the second end of the battery module to be inserted.

8. The cylindrical battery pack according to claim 1, characterized in that, The circumferential limiting mechanism includes a plurality of limiting plates and a plurality of buffer rings. The limiting plates and the buffer rings correspond one by one. The plurality of limiting plates are evenly distributed along the length direction of the battery module. The limiting plate is a circular plate, and a through hole is provided in the middle of the limiting plate. The limiting plate is sleeved outside the battery module. The buffer ring is sleeved on the limiting plate, and the outer surface of the buffer ring abuts against the inner wall of the cylinder.

9. The cylindrical battery pack according to claim 8, characterized in that, An installation groove is provided on the outer peripheral wall of the limiting plate, and a part of the buffer ring is embedded in the installation groove.

10. The cylindrical battery pack according to claim 8, characterized in that, The limiting plate includes two sub-plates. The sub-plates are semi-circular, and sub-holes are provided on the sub-plates. The two sub-plates are spliced to form the limiting plate. The sub-holes on the two sub-plates are spliced to form the through hole on the limiting plate. The sub-plate is detachably connected to the battery module.

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