Battery case and battery

Abstract

The battery shell comprises a shell body and a plurality of end covers, the shell body is provided with a first containing cavity and a plurality of first openings communicated with the first containing cavity, and the end covers are provided with second containing cavities and second openings connected with the second containing cavities. The plurality of end covers respectively cover and are fixed at the plurality of first openings, the plurality of first openings are respectively butted with the plurality of second openings, so that the first accommodating cavity and the plurality of second accommodating cavities are communicated to form a battery cell accommodating cavity, and the extension direction of the plurality of first openings and the length direction of the battery shell form an included angle, so that the opening length of the first openings can be increased; therefore, the battery cell can be conveniently placed in the first accommodating cavity, and then the plurality of end covers are respectively covered and fixed at the plurality of first openings, so that the battery cell is packaged in the battery cell accommodating cavity, and the difficulty of packaging the battery cell in the battery shell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell and a battery. Background Art

[0002] At present, with the increasing miniaturization, lightness and portability of electronic products, such as cameras, notebooks and mobile phones, the driving power of these electronic products is also developing in the direction of high capacity, high safety and lightness. Batteries are widely used in electronic products due to their excellent characteristics such as high capacity.

[0003] The battery includes a shell, a top cover and a battery cell. The shell is provided with a shell cavity, and the battery cell is placed in the shell cavity. Two poles are provided on the top cover. The poles are electrically connected to the battery cell through a soft connecting piece and can be connected to the outside.

[0004] In the prior art, when the battery cell is long, it is difficult to insert the battery cell into the shell cavity. Utility Model Content

[0005] The utility model aims to provide a battery shell and a battery, aiming to solve the problem in existing battery assembly that when the battery core is long, it is difficult to insert the battery core into the shell cavity.

[0006] In a first aspect, the utility model provides a battery shell, comprising a shell and a plurality of end covers, the shell being provided with a first accommodating cavity and a plurality of first openings connected to the first accommodating cavity, the end cover being provided with a second accommodating cavity and a second opening connected to the second accommodating cavity, the plurality of end covers being respectively covered and fixed at the plurality of first openings, the plurality of first openings being respectively connected with the plurality of second openings so that the first accommodating cavity is connected with the plurality of second accommodating cavities to form a battery cell accommodating cavity, and the extension direction of the plurality of first openings being arranged at an angle to the length direction of the battery shell.

[0007] In one embodiment, a first plug-in portion is provided at the first opening, and a second plug-in portion adapted to be connected to the first plug-in portion is provided at the second opening, and the first plug-in portion and the second plug-in portion are plugged and fixed by welding.

[0008] In one embodiment, the shell includes a first side wall, a plurality of first connecting walls fixed to the first side wall, and a second connecting wall connecting the plurality of first connecting walls, the first side wall, the second connecting wall and the plurality of first connecting walls enclose the first accommodating cavity, and a plurality of first openings connected to the first accommodating cavity, and the maximum projection area of ​​the second connecting wall is smaller than the maximum projection area of ​​the first side wall.

[0009] In one embodiment, the end cover includes a second side wall, a third connecting wall fixed to the second side wall, and a plurality of fourth connecting walls connecting the second side wall and the third connecting wall, the second side wall, the third connecting wall and the plurality of fourth connecting walls enclose the second accommodating cavity, and a plurality of second openings communicating with the second accommodating cavity; the second side wall is fixedly docked with the first side wall, a plurality of the fourth connecting walls are respectively fixedly docked with a plurality of the first connecting walls, and the third connecting wall is fixedly docked with the second connecting wall to enclose the battery cell accommodating cavity; and / or,

[0010] The second connecting wall includes a plurality of welding walls, one side of each of the welding walls is respectively connected to the plurality of first connecting walls, and the other side is respectively formed with a protrusion, the protrusions of each of the welding walls are welded and fixed to each other, and the protrusion is a protrusion structure formed outside the battery shell.

[0011] In a second aspect, the utility model further provides a battery, comprising a battery cell and a battery shell according to any one of the above embodiments, wherein the battery cell is disposed in the battery shell.

[0012] In one embodiment, the battery further includes a first pole and a second pole, and the first pole and the second pole are both mounted on the battery shell;

[0013] At least one of the first pole and the second pole is a composite pole, and the composite pole includes a first pole ear and a second pole ear; a connecting ring is provided on the first pole ear, and a connecting column is provided on the second pole ear, and the outer wall of the connecting column is fitted and connected with the inner wall of the connecting ring, and the inner wall of the connecting ring is formed with a first limiting portion, and the outer wall of the connecting column is formed with a second limiting portion for positioning and cooperating with the first limiting portion.

[0014] In one embodiment, the first limiting portion is an annular protrusion structure extending circumferentially on the inner side wall of the connecting ring, and the second limiting portion is an annular groove structure extending circumferentially on the outer side wall of the connecting column; and / or,

[0015] The inner side wall of the connecting ring is fixed to the end edge of the connecting column by welding.

[0016] In one embodiment, the battery further includes a first plastic plate, a second plastic plate and a first sealing ring, the first plastic plate is arranged between the outer wall of the battery shell and the first pole ear, the second plastic plate is arranged between the inner wall of the battery shell and the second pole ear, and the first sealing ring is arranged around the composite pole and elastically abuts between the composite pole and the battery shell.

[0017] In one embodiment, the battery further includes a first pole and a second pole, and the first pole and the second pole are both mounted on the battery shell;

[0018] At least one of the first pole and the second pole is a battery pole, and the battery pole includes a third pole lug formed by stretching and a fourth pole lug formed by stacking, and the third pole lug and the fourth pole lug are integrally formed.

[0019] In one embodiment, the battery further includes a third plastic plate, a fourth plastic plate and a second sealing ring, the third plastic plate is arranged between the outer wall of the battery shell and the third pole ear, the fourth plastic plate is arranged between the inner wall of the battery shell and the fourth pole ear, and the second sealing ring is arranged on the battery pole and elastically abuts between the battery pole and the battery shell.

[0020] The following beneficial effects are achieved by using the embodiments of the present invention:

[0021] With the battery shell and battery of the utility model, the shell is provided with a first accommodating cavity, and a plurality of first openings connected to the first accommodating cavity. The extension direction of the plurality of first openings is arranged at an angle with the length direction of the battery shell, which can increase the opening length of the first opening, so that the battery cell can be placed in the first accommodating cavity more conveniently. Thereafter, the plurality of end covers are respectively covered and fixed at the plurality of first openings to encapsulate the battery cell in the battery cell accommodating cavity, thereby reducing the difficulty of encapsulating the battery cell in the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] in:

[0024] Figure 1 Schematic diagram of a battery in one embodiment.

[0025] Figure 2 for Figure 1 An enlarged view of section A of the battery shown.

[0026] Figure 3 for Figure 1 Exploded view of the battery case in the battery shown.

[0027] Figure 4 for Figure 3 Enlarged schematic diagram of part B in the middle.

[0028] Figure 5 for Figure 1 Schematic diagram of the end caps in the battery shown.

[0029] Figure 6 for Figure 5 Enlarged schematic diagram of part C in the middle.

[0030] Figure 7 for Figure 1 Schematic diagram of the first state of the composite electrode in the battery shown.

[0031] Figure 8 for Figure 1 Schematic diagram of the second state of the composite electrode in the battery shown.

[0032] Fig. 9 for Figure 1 Schematic diagram of the battery terminals in the battery shown.

[0033] Reference numerals: 100, composite pole; 110, first pole ear; 111, connecting ring; 112, first stopper; 120, second pole ear; 121, connecting pole; 122, second stopper; 210, first plastic plate; 220, second plastic plate; 230, first sealing ring; 240, third plastic plate; 250, fourth plastic plate; 260, second sealing ring; 300, battery pole; 310, third pole ear; 320, fourth pole ear; 400, shell Body; 410, first side wall; 420, first connecting wall; 430, second connecting wall; 431, welding wall; 4311, raised portion; 401, first accommodating cavity; 402, first opening; 403, first plug-in portion; 500, end cover; 510, second side wall; 520, third connecting wall; 530, fourth connecting wall; 540, fifth connecting wall; 501, second accommodating cavity; 502, second opening; 503, second plug-in portion; 504, pole hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the said features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0037] See also Figures 1 to 9 The embodiment of the utility model discloses a battery shell, which is used to encapsulate a battery cell. The battery shell includes a shell 400 and a plurality of end covers 500. The shell 400 is provided with a first accommodating cavity 401 and a plurality of first openings 402 connected to the first accommodating cavity 401. The end cover 500 is provided with a second accommodating cavity 501 and a second opening 502 connected to the second accommodating cavity 501. The plurality of end covers 500 are respectively covered and fixed at the plurality of first openings 402. The plurality of first openings 402 are respectively connected with the plurality of second openings 502, so that the first accommodating cavity 401 is connected with the plurality of second accommodating cavities 501 to form a battery cell accommodating cavity. The extension direction of the plurality of first openings 402 is arranged at an angle with the length direction of the battery shell.

[0038] It can be understood that since the extension direction of the plurality of first openings 402 is set at an angle with the length direction of the battery shell, the opening length of the first openings 402 can be increased, so that the battery cell can be placed more conveniently in the first accommodating cavity 401. Thereafter, the plurality of end covers 500 are respectively covered and fixed on the plurality of first openings 402 to encapsulate the battery cell in the battery accommodating cavity, thereby reducing the difficulty of encapsulating the battery cell in the battery shell.

[0039] In one embodiment, see Figures 1 to 5 The first opening 402 is provided with a first plug-in portion 403, and the second opening 502 is provided with a second plug-in portion 503 adapted to be connected with the first plug-in portion 403. The first plug-in portion 403 and the second plug-in portion 503 are plugged and welded to form a welding connection. The welding line can be formed outside the battery shell to avoid damaging the battery cell. Furthermore, due to the first plug-in portion 403 and the second plug-in portion 503, the connection firmness of the plurality of end covers 500 respectively covering and fixing at the plurality of first openings 402 can also be increased.

[0040] Specifically, the first plug-in portion 403 is a stepped protrusion formed outside the battery cell accommodating cavity, and in this case, the second plug-in portion 503 can be inserted inside the first plug-in portion 403. Of course, in other embodiments, the second plug-in portion 503 can also be a protrusion structure formed outside the battery cell accommodating cavity, and in this case, the first plug-in portion 403 can be inserted inside the second plug-in portion 503.

[0041] In one embodiment, see Figures 1 to 5 The shell 400 includes a first side wall 410, a plurality of first connecting walls 420 fixed to the first side wall 410, and a second connecting wall 430 connecting the plurality of first connecting walls 420. The first side wall 410, the second connecting wall 430 and the plurality of first connecting walls 420 enclose a first accommodating cavity 401, and a plurality of first openings 402 communicating with the first accommodating cavity 401. The maximum projection area of ​​the second connecting wall 430 is smaller than the maximum projection area of ​​the first side wall 410. By such a configuration, the extension direction of the plurality of first openings 402 can be set at an angle to the length direction of the battery shell, thereby increasing the opening length of the first opening 402, so that the battery cell can be placed in the first accommodating cavity 401 more conveniently.

[0042] Furthermore, the first plug-in portion 403 is formed on the first connecting wall 420, and the first plug-in portion 403 is not provided on the first side wall 410 and the second connecting wall 430, thereby ensuring that the outer walls at the first side wall 410 and the second connecting wall 430 are straight and smooth, facilitating close fitting of the heat-conducting components and facilitating heat dissipation.

[0043] Specifically, two first connecting walls 420 are provided and are arranged in parallel on both sides of the first side wall 410. Further, the first connecting wall 420 is trapezoidal. The battery case of the utility model is a rectangular parallelepiped structure. Of course, in other embodiments, the maximum projection area of ​​the second connecting wall 430 can also be equal to the maximum projection area of ​​the first side wall 410. In this case, the first connecting wall 420 is a non-right-angled parallelogram.

[0044] In one embodiment, see Figures 1 to 5The end cap 500 includes a second side wall 510, a third connecting wall 520 fixed to the second side wall 510, and a plurality of fourth connecting walls 530 connecting the second side wall 510 and the third connecting wall 520. The second side wall 510, the third connecting wall 520 and the plurality of fourth connecting walls 530 enclose a second accommodating cavity 501, and a plurality of second openings 502 connected to the second accommodating cavity 501; the second side wall 510 is fixedly docked with the first side wall 410, the plurality of fourth connecting walls 530 are respectively fixedly docked with the plurality of first connecting walls 420, and the third connecting wall 520 is fixedly docked with the second connecting wall 430 to enclose a battery cell accommodating cavity. By setting the second accommodating cavity 501, the end cap 500 can be sleeved on the portion of the battery cell exposed in the first accommodating cavity 401, so as to facilitate the assembly of the battery cell on the battery shell.

[0045] Specifically, the second side wall 510 and the third connecting wall 520 are vertically arranged, and further, there is an arc transition between the second side wall 510 and the third connecting wall 520. The second side wall 510 is further provided with a fifth connecting wall 540, and the fifth connecting wall 540 is connected and fixed to the first side wall 410.

[0046] In this embodiment, the battery case further includes an explosion-proof valve, which is installed on the second side wall 510 and / or the third connecting wall 520. The second side wall 510 and / or the third connecting wall 520 are also provided with a liquid injection hole and a pole hole 504. Specifically, the end cover 500 can be made of plate materials welded together, and of course, the end cover 500 can also be formed by integrally stretching the plate materials.

[0047] It is understandable that the angle between the extension direction of the first openings 402 and the length direction of the battery shell can be adjusted as needed to meet more installation position requirements for the pole hole 504, explosion-proof valve, pole structure, injection hole, etc.

[0048] In one embodiment, see Figures 1 to 5 The second connecting wall 430 includes a plurality of welding walls 431, one side of each of the welding walls 431 is connected to the plurality of first connecting walls 420, and the other side is formed with a protrusion 4311, and the protrusions 4311 of the welding walls 431 are welded and fixed to each other, and the protrusion 4311 is a protrusion structure formed outside the battery shell. By such an arrangement, the protrusions 4311 of the welding walls 431 are welded to each other to form a weld portion, and the weld portion is arranged to protrude outward relative to the outer wall surface of the welding wall 431, thereby preventing the burrs generated at the welding position from contacting the battery cell, thereby preventing the battery cell from being damaged or short-circuited. Specifically, the shell 400 is a cavity structure formed by bending a plate and welding it.

[0049] Furthermore, by setting the raised structure of the first plug-in portion 403 and the raised portion 4311, the rigidity of the battery shell can be enhanced, and the deformation of the shell 400 caused by welding can be prevented, thereby reducing the deformation of the battery shell after welding and reducing the risk of air leakage in the weld.

[0050] See also Figures 1 to 9 The embodiment of the utility model further discloses a battery, the battery comprising a battery cell and a battery shell of any of the above embodiments, wherein the battery cell is disposed in the battery shell. It is understandable that, since the extension direction of the plurality of first openings 402 is arranged at an angle to the length direction of the battery shell, the opening length of the first openings 402 can be increased, so that the battery cell can be placed in the first accommodating cavity 401 more conveniently, and thereafter, the plurality of end covers 500 are respectively covered and fixed to the plurality of first openings 402 to encapsulate the battery cell in the battery accommodating cavity, thereby reducing the difficulty of encapsulating the battery cell in the battery shell.

[0051] In one embodiment, see Figure 1 , Figure 7 and Figure 8 The battery further includes a first electrode and a second electrode, both of which are mounted on the battery shell; at least one of the first electrode and the second electrode is a composite electrode 100, and the composite electrode 100 includes a first pole ear 110 and a second pole ear 120; a connecting ring 111 is provided on the first pole ear 110, and a connecting column 121 is provided on the second pole ear 120, and the outer wall of the connecting column 121 is fitted and connected with the inner wall of the connecting ring 111, thereby increasing the contact area between the first pole ear 110 and the second pole ear 120, thereby enhancing the conductivity between the first pole ear 110 and the second pole ear 120.

[0052] In this embodiment, the inner wall of the connecting ring 111 is formed with a first limiting portion 112, and the outer wall of the connecting column 121 is formed with a second limiting portion 122 for positioning and cooperating with the first limiting portion 112. By axially positioning the connecting ring 111 and the connecting column 121, the axial displacement resistance between the first pole ear 110 and the second pole ear 120 can be improved, thereby ensuring the reliability of preventing the first pole ear 110 and the second pole ear 120 from loosening.

[0053] In one embodiment, see Figure 7 and Figure 8 The first limiting portion 112 is a limiting protrusion formed on the inner wall of the connecting ring 111, and the second limiting portion 122 is a limiting groove formed on the outer wall of the connecting column 121, so that the connecting ring 111 and the connecting column 121 are axially positioned through the positioning cooperation of the limiting protrusion and the limiting groove.

[0054] Furthermore, in this embodiment, the first limiting portion 112 is an annular protrusion structure extending circumferentially on the inner side wall of the connecting ring 111, and the second limiting portion 122 is an annular groove structure extending circumferentially on the outer side wall of the connecting column 121, so as to ensure the firmness of the positioning fit between the limiting protrusion and the limiting groove. Of course, the first limiting portion 112 can also be a plurality of protrusion structures arranged at intervals in the circumferential direction on the inner side wall of the connecting ring 111, and the second limiting portion 122 can also be a plurality of groove structures arranged at intervals in the circumferential direction on the outer side wall of the connecting column 121.

[0055] Preferably, the inner side wall of the connecting ring 111 is welded to the end edge of the connecting column 121, so as to further enhance the firmness of the connection between the connecting ring 111 and the connecting column 121. Specifically, the second electrode tab 120 is formed by integrally pressing a copper material.

[0056] Of course, in other embodiments, the first limiting portion 112 may also be a groove structure formed on the inner wall of the connecting ring 111 , and the second limiting portion 122 may also be a protrusion structure formed on the outer wall of the connecting column 121 .

[0057] In one embodiment, the battery further includes a first plastic plate 210, a second plastic plate 220 and a first sealing ring 230. The first plastic plate 210 is arranged between the outer wall of the battery shell and the first pole ear 110, the second plastic plate 220 is arranged between the inner wall of the battery shell and the second pole ear 120, and the first sealing ring 230 is arranged around the composite pole 100 and elastically abuts between the composite pole 100 and the battery shell, thereby realizing the assembly of the composite pole 100 on the battery shell.

[0058] In one embodiment, see Figure 1 and Fig. 9 At least one of the first pole and the second pole is a battery pole 300, and the battery pole 300 includes a third pole ear 310 formed by stretching and a fourth pole ear 320 formed by stacking. The third pole ear 310 and the fourth pole ear 320 are integrally formed. Through the arrangement of the battery pole 300, the installation process of the pole structure is simplified, the preparation and assembly cost of the pole structure is reduced, and the conductivity of the battery pole 300 is ensured to be good.

[0059] Specifically, the battery pole 300 is a pole structure formed by stacking sheets after being stretched integrally, and the fourth pole ear 320 is located in the battery shell and can be used as a soft connecting piece. The longitudinal section of the battery pole 300 is in the shape of an "I".

[0060] Furthermore, in the present embodiment, the battery also includes a third plastic plate 240, a fourth plastic plate 250 and a second sealing ring 260. The third plastic plate 240 is arranged between the outer wall of the battery shell and the third pole ear 310, and the fourth plastic plate 250 is arranged between the inner wall of the battery shell and the fourth pole ear 320. The second sealing ring 260 is arranged around the battery pole 300 and elastically abuts between the battery pole 300 and the battery shell, thereby realizing the assembly of the battery pole 300 on the battery shell.

[0061] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A battery case, characterized in that: The battery shell comprises a shell (400) and a plurality of end covers (500); the shell (400) is provided with a first accommodating cavity (401) and a plurality of first openings (402) connected to the first accommodating cavity (401); the end cover (500) is provided with a second accommodating cavity (501) and a second opening (502) connected to the second accommodating cavity (501); the plurality of end covers (500) are respectively covered and fixed on the plurality of first openings (402); the plurality of first openings (402) are respectively connected to the plurality of second openings (502) so that the first accommodating cavity (401) is connected to the plurality of second accommodating cavities (501) to form a battery cell accommodating cavity; and the extension direction of the plurality of first openings (402) is arranged at an angle to the length direction of the battery shell.

2. The battery case according to claim 1, characterized in that: The first opening (402) is provided with a first plug-in portion (403), and the second opening (502) is provided with a second plug-in portion (503) adapted to be connected with the first plug-in portion (403). The first plug-in portion (403) and the second plug-in portion (503) are plugged and fixed with each other by welding.

3. The battery case according to claim 2, characterized in that: The shell (400) comprises a first side wall (410), a plurality of first connecting walls (420) fixed to the first side wall (410), and a second connecting wall (430) connecting the plurality of first connecting walls (420); the first side wall (410), the second connecting wall (430) and the plurality of first connecting walls (420) enclose the first accommodating cavity (401), and a plurality of first openings (402) connected to the first accommodating cavity (401); the maximum projection area of ​​the second connecting wall (430) is smaller than the maximum projection area of ​​the first side wall (410).

4. The battery case according to claim 3, characterized in that: The end cover (500) comprises a second side wall (510), a third connecting wall (520) fixed to the second side wall (510), and a plurality of fourth connecting walls (530) connecting the second side wall (510) and the third connecting wall (520), wherein the second side wall (510), the third connecting wall (520) and the plurality of fourth connecting walls (530) are combined to form the second accommodating cavity (501), and a plurality of second openings (502) communicating with the second accommodating cavity (501); the second side wall (510) is fixedly docked with the first side wall (410), the plurality of fourth connecting walls (530) are respectively fixedly docked with the plurality of first connecting walls (420), and the third connecting wall (520) is fixedly docked with the second connecting wall (430), so as to form the battery cell accommodating cavity; and / or, The second connecting wall (430) includes a plurality of welding walls (431), one side of each of the welding walls (431) is respectively connected to the plurality of first connecting walls (420), and the other side is respectively formed with a protrusion (4311), the protrusions (4311) of the plurality of welding walls (431) are welded and fixed to each other, and the protrusion (4311) is a protrusion structure formed outside the battery shell.

5. A battery, characterized in that: The battery comprises a battery cell and a battery shell according to any one of claims 1 to 4, wherein the battery cell is disposed in the battery shell.

6. The battery according to claim 5, characterized in that The battery further comprises a first pole and a second pole, wherein the first pole and the second pole are both mounted on the battery shell; At least one of the first pole and the second pole is a composite pole (100), and the composite pole (100) comprises a first pole ear (110) and a second pole ear (120); the first pole ear (110) is provided with a connecting ring (111), and the second pole ear (120) is provided with a connecting column (121); the outer wall of the connecting column (121) is fittedly connected to the inner wall of the connecting ring (111), the inner wall of the connecting ring (111) is formed with a first limiting portion (112), and the outer wall of the connecting column (121) is formed with a second limiting portion (122) for positioning and cooperating with the first limiting portion (112).

7. The battery according to claim 6, characterized in that The first limiting portion (112) is an annular protrusion structure extending circumferentially from the inner wall of the connecting ring (111), and the second limiting portion (122) is an annular groove structure extending circumferentially from the outer wall of the connecting column (121); and / or, The inner side wall of the connecting ring (111) is fixed to the end edge of the connecting column (121) by welding.

8. The battery according to claim 6, characterized in that The battery further comprises a first plastic plate (210), a second plastic plate (220) and a first sealing ring (230); the first plastic plate (210) is arranged between the outer wall of the battery shell and the first pole lug (110); the second plastic plate (220) is arranged between the inner wall of the battery shell and the second pole lug (120); the first sealing ring (230) is arranged around the composite pole (100) and elastically abuts between the composite pole (100) and the battery shell.

9. The battery according to claim 5, characterized in that The battery further comprises a first pole and a second pole, wherein the first pole and the second pole are both mounted on the battery shell; At least one of the first pole and the second pole is a battery pole (300), the battery pole (300) comprising a third pole lug (310) formed by stretching and a fourth pole lug (320) formed by stacking, the third pole lug (310) and the fourth pole lug (320) being integrally formed.

10. The battery according to claim 9, characterized in that The battery further comprises a third plastic plate (240), a fourth plastic plate (250) and a second sealing ring (260); the third plastic plate (240) is arranged between the outer wall of the battery shell and the third pole lug (310); the fourth plastic plate (250) is arranged between the inner wall of the battery shell and the fourth pole lug (320); the second sealing ring (260) is arranged around the battery pole (300) and elastically abuts between the battery pole (300) and the battery shell.

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