Battery

Abstract

The present invention belongs to the field of battery technology, and discloses a battery, which includes a shell, a winding core, a cover assembly, a liquid injection sealing nail, and an explosion-proof valve. The winding core is arranged inside the shell; the cover assembly is installed on the top of the shell, and the cover assembly includes a pole, and a liquid injection port connecting the outside of the battery and the inside of the shell is opened on the pole; the liquid injection sealing nail and the explosion-proof valve are both installed on the pole, and the liquid injection sealing nail and the explosion-proof valve are both arranged corresponding to the liquid injection port. The battery of the present invention can inject helium into the shell from the liquid injection port, shortening the subsequent helium inspection time.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, in particular to batteries. Background Art

[0002] Existing cylindrical batteries use a grooved sealing cover that is welded to the shell, making it impossible to fill the battery with helium. As a result, subsequent helium testing (using helium to test the sealing) takes too much time. For example, helium is infiltrated from the outside of the battery using a specific instrument, and then a helium test is performed. This often takes more than four hours, is cumbersome to operate, and is not conducive to battery batch testing. Summary of the invention

[0003] One object of the present invention is to provide a battery, which can inject helium into the interior of the shell from the liquid injection port to shorten the subsequent helium detection time.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Batteries, including:

[0006] case;

[0007] A winding core is arranged inside the shell;

[0008] A cover plate assembly is mounted on the top of the shell, the cover plate assembly includes a pole, and the pole is provided with a liquid injection port connecting the outside of the battery and the inside of the shell;

[0009] The liquid injection sealing nail and the explosion-proof valve are both installed on the pole, and the liquid injection sealing nail and the explosion-proof valve are both arranged corresponding to the liquid injection port.

[0010] As an optional technical solution, an explosion-proof cavity is provided inside the liquid injection sealing nail, the explosion-proof cavity is communicated with the liquid injection port, and the explosion-proof valve is arranged in the explosion-proof cavity.

[0011] As an optional technical solution, a receiving groove is provided on the pole, the receiving groove is communicated with the liquid injection port, and the liquid injection sealing nail is completely received in the receiving groove.

[0012] As an optional technical solution, the containing groove is located at the top of the pole, and the liquid injection port is located at the bottom of the pole.

[0013] As an optional technical solution, the side wall of the receiving groove is an inclined surface, and the bottom area of ​​the receiving groove is smaller than the groove opening area of ​​the receiving groove, and the peripheral surface of the liquid injection sealing nail is adapted to the side wall of the receiving groove.

[0014] As an optional technical solution, the area of ​​the liquid injection port is smaller than the bottom area of ​​the containing tank.

[0015] As an optional technical solution, the cover plate assembly further comprises a top cover plate, the periphery of the top cover plate is provided with a flange structure, and the flange structure is welded and sealed with the top port of the shell.

[0016] As an optional technical solution, the top cover is configured as a sunken platform structure, the top cover includes a sunken platform body, the pole seal is installed on the sunken platform body, and the flange structure is arranged on the periphery of the sunken platform body.

[0017] As an optional technical solution, a mounting hole is opened in the middle of the top cover plate, the pole is located in the mounting hole, and a sealing ring is provided between the outer wall of the pole and the inner wall of the mounting hole.

[0018] As an optional technical solution, the sealing ring includes an outer sealing ring and an inner sealing ring, the outer sealing ring and the inner sealing ring are separately arranged, the top cover plate and the shell form a loading cavity, the outer sealing ring is located outside the loading cavity, and the inner sealing ring is located in the loading cavity.

[0019] As an optional technical solution, the cover plate assembly further includes a limit member, which is located in the loading cavity, the upper end of the limit member abuts against the top cover plate, and the lower end of the limit member abuts against the winding core.

[0020] As an optional technical solution, the cover plate assembly also includes a pressure ring and a top current collecting plate. A ring groove is opened on the periphery of the pole, the inner ring of the pressure ring is embedded in the ring groove, the outer ring of the pressure ring is welded to the top current collecting plate, and the top current collecting plate is welded to the top pole ear of the winding core.

[0021] As an optional technical solution, the top current collecting disc is configured as a multi-layer laminate structure, the top laminate of the top current collecting disc is in contact with the pole and the pressure ring, and the bottom laminate of the top current collecting disc is in contact with the winding core.

[0022] As an optional technical solution, an avoidance gap is provided on the periphery of the limiting member, and the avoidance gap is used to avoid the top collecting plate.

[0023] As an optional technical solution, a bottom collecting plate is arranged between the bottom pole ear of the winding core and the bottom wall of the shell, a boss is arranged at the center of the bottom collecting plate, the side of the boss facing the bottom wall is welded to the bottom wall, and a spacing space is formed between the side of the boss facing the winding core and the winding core.

[0024] As an optional technical solution, the bottom collecting plate is radially provided with a plurality of fan-shaped platforms, the plurality of fan-shaped platforms are arranged around the periphery of the boss, the fan-shaped platforms are welded to the bottom wall on the side facing the bottom wall, and a spacing space is formed between the fan-shaped platforms and the winding core on the side facing the winding core.

[0025] As an optional technical solution, ventilation holes are provided on the fan-shaped platform.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a battery, which includes a shell, a winding core, a cover plate assembly, a liquid injection sealing nail and an explosion-proof valve. When assembling the battery, an open formation process is used at the liquid injection port, and the gas generated by the winding core passes through the liquid injection port, the explosion-proof valve and the liquid injection sealing nail and is discharged to the outside of the battery, thereby reducing the gas pressure inside the shell; helium is injected into the shell from the liquid injection port, and the helium passes through the liquid injection port, the explosion-proof valve and the liquid injection sealing nail and enters the shell, thereby shortening the subsequent helium inspection time; the explosion-proof valve and the liquid injection sealing nail are installed on the pole and correspond to the liquid injection port, thereby improving the space utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described in detail below based on the accompanying drawings and embodiments;

[0029] Figure 1 An exploded view of the structure of the battery described in the embodiment;

[0030] Figure 2 is a cross-sectional view of a battery according to an embodiment;

[0031] Figure 3 for Figure 2 A partial enlarged view of position A in the middle;

[0032] Figure 4 for Figure 2 A partial enlarged view of position B in the middle;

[0033] Figure 5 for Figure 2 A partial enlarged view of the C position in the middle;

[0034] Figure 6 It is a structural assembly diagram of the pole, liquid injection sealing nail and explosion-proof valve described in the embodiment;

[0035] Figure 7 It is a structural assembly diagram of the cover plate assembly described in the embodiment;

[0036] Figure 8 It is a structural schematic diagram of the position limiting member described in the embodiment;

[0037] Fig. 9It is a schematic structural diagram of the bottom current collecting plate described in the embodiment.

[0038] In the figure:

[0039] 1. Shell; 11. Loading cavity; 12. Bottom wall;

[0040] 2. Roll core;

[0041] 3. Cover plate assembly; 31. Pole; 311. Liquid injection port; 312. Accommodation groove; 313. Ring groove; 32. Top cover plate; 321. Flanging structure; 322. Sink body; 33. Outer sealing ring; 34. Inner sealing ring; 35. Stopper; 351. Avoidance gap; 36. Pressing ring; 361. Inner ring; 362. Outer ring; 37. Top collector plate; 371. Top lamination; 372. Bottom lamination;

[0042] 4. Liquid injection sealing nail; 41. Explosion-proof chamber; 42. Liquid injection hole;

[0043] 5. Explosion-proof valve;

[0044] 6. Bottom collecting plate; 61. Boss; 62. Fan-shaped platform; 63. Vent hole. DETAILED DESCRIPTION

[0045] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", etc., and the like, are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0050] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0051] During the formation, capacity division and recycling process of the battery, gas is generated inside the battery, causing the structure of the battery shell to swell and deform.

[0052] like Figures 1 to 9 As shown, in order to solve the above problems, the battery provided in this embodiment includes a shell 1, a winding core 2, a cover assembly 3, a liquid injection sealing nail 4 and an explosion-proof valve 5; the winding core 2 is arranged inside the shell 1; the cover assembly 3 is installed on the top of the shell 1, and the cover assembly 3 includes a pole 31, and the pole 31 is provided with a liquid injection port 311 connecting the outside of the battery with the inside of the shell 1; the liquid injection sealing nail 4 and the explosion-proof valve 5 are both installed on the pole 31, and the liquid injection sealing nail 4 and the explosion-proof valve 5 are both arranged corresponding to the liquid injection port 311.

[0053] Specifically, when assembling the battery, an open formation process is used at the liquid injection port 311, and the gas generated by the core 2 passes through the liquid injection port 311, the explosion-proof valve 5 and the liquid injection sealing nail 4 and is discharged to the outside of the battery, thereby reducing the gas pressure inside the shell 1; helium is injected into the shell 1 from the liquid injection port 311, and the helium passes through the liquid injection port 311, the explosion-proof valve 5 and the liquid injection sealing nail 4 and enters the shell 1, thereby shortening the subsequent helium inspection time; the explosion-proof valve 5 and the liquid injection sealing nail 4 are installed on the pole 31 and correspond to the liquid injection port 311, thereby improving space utilization.

[0054] The installation space of the cover assembly 3 is limited. If the explosion-proof valve 5 is set on one side of the liquid injection port 311, it will affect the welding of other structural components such as connecting plates. To solve this technical problem, this embodiment sets the explosion-proof valve 5 corresponding to the liquid injection port 311 to improve space utilization.

[0055] Optionally, the material of the housing 1 is nickel-plated steel or aluminum alloy.

[0056] In this embodiment, an explosion-proof cavity 41 is opened inside the liquid injection sealing nail 4, and the explosion-proof cavity 41 is connected to the liquid injection port 311. The explosion-proof valve 5 is arranged in the explosion-proof cavity 41, which saves the space of the cover plate assembly 3 separately set up for installing the explosion-proof valve 5. For example, this embodiment saves the space of the top cover plate 32 separately set up for installing the explosion-proof valve 5, and when the explosion-proof valve 5 is opened, it can prevent the structural parts in the cover plate assembly 3 from splashing. The liquid injection sealing nail 4 can protect the explosion-proof valve 5 and prevent the explosion-proof valve 5 from being subjected to direct radial force from the outside.

[0057] In this embodiment, the liquid injection sealing nail 4 is provided with a plurality of liquid injection holes 42 , and the liquid injection holes 42 are communicated with the explosion-proof cavity 41 .

[0058] In this embodiment, the injection hole 42 is located above the explosion-proof cavity 41. After the explosion-proof valve 5 is opened, the gas first passes through the explosion-proof valve 5 and the explosion-proof cavity 41 and then passes through the injection hole 42, thereby improving the smoothness of gas discharge; objects from the outside that move axially cannot pass through the injection hole 42 and cannot directly act on the explosion-proof valve 5.

[0059] In some other embodiments, the injection hole 42 is located below the explosion-proof chamber 41 , and after the explosion-proof valve 5 is opened, the gas first passes through the injection hole 42 and then passes through the explosion-proof valve 5 and the explosion-proof chamber 41 .

[0060] Optionally, the explosion-proof valve 5 is cross-shaped or circular-shaped.

[0061] In this embodiment, a receiving groove 312 is provided on the pole 31, and the receiving groove 312 is connected to the liquid injection port 311. The liquid injection sealing nail 4 is completely accommodated in the receiving groove 312 to prevent the liquid injection sealing nail 4 from being radially impacted by external forces, thereby ensuring the installation stability of the liquid injection sealing nail 4 in the receiving groove 312.

[0062] In this embodiment, the accommodating groove 312 is located at the top of the pole 31, and the injection port 311 is located at the bottom of the pole 31, that is, the injection sealing nail 4 is located outside the loading cavity 11, which is convenient for loading the injection sealing nail 4 and is beneficial to the welding work of the injection sealing nail 4.

[0063] In some other embodiments, the containing groove 312 is located at the bottom of the pole 31 , and the liquid injection port 311 is located at the top of the pole 31 .

[0064] Optionally, the side wall of the receiving groove 312 is an inclined surface, and the bottom area of ​​the receiving groove 312 is smaller than the notch area of ​​the receiving groove 312 , and the peripheral surface of the liquid injection sealing nail 4 is adapted to the side wall of the receiving groove 312 .

[0065] In this embodiment, the liquid injection sealing nail 4 is a truncated cone structure, and the receiving groove 312 is an inverted truncated cone groove structure. The liquid injection sealing nail 4 is inverted in the receiving groove 312, and the side wall of the receiving groove 312 supports the liquid injection sealing nail 4. During welding, there is no need to set up additional support parts to support the liquid injection sealing nail 4.

[0066] In some other embodiments, the liquid injection sealing nail 4 is a prism structure, and the receiving groove 312 is an inverted prism groove structure.

[0067] In this embodiment, the peripheral surface of the liquid injection sealing nail 4 is welded to the side wall of the accommodating groove 312, thereby improving the connection stability and reducing the number of fastening parts.

[0068] In this embodiment, the area of ​​the liquid injection port 311 is smaller than the bottom area of ​​the receiving groove 312. The bottom of the receiving groove 312 can support the liquid injection sealing nail 4.

[0069] In this embodiment, the containing groove 312 and the liquid injection port 311 are coaxially arranged.

[0070] In this embodiment, the cover plate assembly 3 also includes a top cover plate 32, and a flange structure 321 is provided on the periphery of the top cover plate 32. The flange structure 321 is welded and sealed with the top port of the shell 1 to improve welding convenience to ensure sealing performance and supporting strength.

[0071] In this embodiment, the top cover 32 is configured as a sunken platform structure, the top cover 32 includes a sunken platform body 322, the pole 31 is sealed and installed on the sunken platform body 322, and the flange structure 321 is arranged on the periphery of the sunken platform body 322 to improve the axial space utilization.

[0072] In this embodiment, a mounting hole is provided in the middle of the top cover sheet 32, the pole 31 is located in the mounting hole, and a sealing ring is provided between the outer wall of the pole 31 and the inner wall of the mounting hole to improve the sealing performance between the pole 31 and the top cover sheet 32. Specifically, the mounting hole is located in the middle of the sink body 322.

[0073] In this embodiment, the sealing ring includes an outer sealing ring 33 and an inner sealing ring 34. The outer sealing ring 33 and the inner sealing ring 34 are separately arranged. The top cover plate 32 and the shell 1 form a loading cavity 11. The outer sealing ring 33 is located outside the loading cavity 11, and the inner sealing ring 34 is located in the loading cavity 11. During assembly production, the outer sealing ring 33 and the inner sealing ring 34 are installed separately, which is convenient for installation operation.

[0074] In some other embodiments, the outer sealing ring 33 and the inner sealing ring 34 are integrally provided.

[0075] In this embodiment, the cover plate assembly 3 further includes a stopper 35, which is located in the loading inner cavity 11, the upper end of the stopper 35 abuts against the top cover sheet 32, and the lower end of the stopper 35 abuts against the winding core 2. When welding the flange structure 321, the stopper 35 can support the cover plate assembly 3 to prevent the top cover sheet 32 ​​from tipping over and causing poor welding. Specifically, the upper end of the stopper 35 abuts against the sink body 322.

[0076] Optionally, the limiting member 35 is made of plastic material to reduce weight.

[0077] In this embodiment, the cover plate assembly 3 also includes a pressure ring 36 and a top current collecting plate 37. An annular groove 313 is opened on the periphery of the pole 31. The inner ring portion 361 of the pressure ring 36 is embedded in the annular groove 313. The outer ring portion 362 of the pressure ring 36 is welded to the top current collecting plate 37. The top current collecting plate 37 is welded to the top pole ear of the winding core 2. The pressure ring 36 limits the pole 31 to be pressed against the top current collecting plate 37, thereby ensuring the abutment stability between the pole 31 and the top current collecting plate 37.

[0078] In this embodiment, the top current collecting disc 37 is configured as a multi-layer laminate structure, the top laminate 371 of the top current collecting disc 37 is in contact with the pole 31 and the pressure ring 36 at the same time, and the bottom laminate 372 of the top current collecting disc 37 is in contact with the winding core 2 to improve the conductivity.

[0079] In this embodiment, the periphery of the limiter 35 is provided with an avoidance notch 351, and the avoidance notch 351 is used to avoid the top current collecting plate 37. The top current collecting plate 37 of this embodiment is set as a two-layer laminated structure, and some other embodiments are three-layer or four-layer laminated structures. Before assembly production, the top current collecting plate 37 is a single-layer sheet structure. First, one end of the top current collecting plate 37 is extended to the bottom of the limiter 35 and abuts against the pole 31 and the pressure ring 36 at the same time. The other end of the top current collecting plate 37 is still at the periphery of the limiter 35. At this time, the top current collecting plate 37 passes through the avoidance notch 351, and the top current collecting plate 37 is not subjected to the pressure force of the limiter 35, so as to avoid product scrapping due to different subsequent bending positions.

[0080] In this embodiment, a bottom collecting plate 6 is arranged between the bottom pole ear of the winding core 2 and the bottom wall 12 of the shell 1, and a boss 61 is arranged at the center of the bottom collecting plate 6. The side of the boss 61 facing the bottom wall 12 is welded to the bottom wall 12, and a spacing space is formed between the side of the boss 61 facing the winding core 2 and the winding core 2.

[0081] In this embodiment, the bottom collecting plate 6 is radially provided with a plurality of fan-shaped platforms 62, which are arranged around the periphery of the boss 61, and the side of the fan-shaped platform 62 facing the bottom wall 12 is welded to the bottom wall 12, and a spacing space is formed between the side of the fan-shaped platform 62 facing the winding core 2 and the winding core 2.

[0082] Optionally, the bottom end surface of the shell 1 is set to be a smooth plane, and the outer surface of the bottom wall 12 is a smooth plane.

[0083] Optionally, a vent hole 63 is provided on the fan-shaped platform 62 .

[0084] The assembly and production of the battery of this embodiment includes the following steps:

[0085] Step 1: Weld the bottom collecting plate 6 to the bottom end of the winding core 2, then install the winding core 2 and the bottom collecting plate 6 into the shell 1, and weld the bottom collecting plate 6 to the bottom wall 12 by laser penetration welding, resistance welding or ultrasonic torque welding.

[0086] Step 2: Weld the explosion-proof valve 5 into the explosion-proof cavity 41 of the liquid injection sealing nail 4.

[0087] Step 3: Bond the limiting member 35 to the bottom of the sink body 322 .

[0088] Step 4: sleeve the outer sealing ring 33 on the outer periphery of the pole 31 , and then insert the pole 31 into the mounting hole of the sink body 322 and the middle through hole of the limiter 35 after completing step 3.

[0089] Step 5: sleeve the inner sealing ring 34 onto the outer circumference of the pressing ring 36 , and then insert the inner ring portion 361 of the pressing ring 36 into the annular groove 313 of the pole 31 completed in step 4.

[0090] Step six: Weld one end of the sheet-shaped top current collecting plate 37 to the bottom of the pressure ring 36 that has completed step five.

[0091] Step 7: Fold the other end of the top current collecting plate 37 in step 6 to the bottom of the pressing ring 36 so that the top current collecting plate 37 forms a multi-layer laminate structure.

[0092] Step eight: install the whole structure after step seven into the top of the shell 1 after step one, and weld the flange structure 321 to the top port of the shell 1 .

[0093] Step nine: inject liquid into the liquid injection port 311 of the pole 31 after completing step eight, fill it with helium, and weld the liquid injection density nail 4 after completing step two to the receiving groove 312.

[0094] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery, characterized in that include: Housing (1); A winding core (2) is arranged inside the shell (1); A cover plate assembly (3) is mounted on the top of the shell (1), the cover plate assembly (3) comprises a pole (31), and the pole (31) is provided with a liquid injection port (311) connecting the outside of the battery with the inside of the shell (1); A liquid injection sealing nail (4) and an explosion-proof valve (5), wherein the liquid injection sealing nail (4) and the explosion-proof valve (5) are both installed on the pole (31), and the liquid injection sealing nail (4) and the explosion-proof valve (5) are both arranged corresponding to the liquid injection port (311); The liquid injection sealing nail (4) is provided with an explosion-proof cavity (41) inside, the explosion-proof cavity (41) is communicated with the liquid injection port (311), and the explosion-proof valve (5) is arranged in the explosion-proof cavity (41); the liquid injection sealing nail (4) is also provided with a plurality of liquid injection holes (42), the liquid injection holes (42) are communicated with the explosion-proof cavity (41); the liquid injection holes (42) are located above the explosion-proof cavity (41).

2. The battery according to claim 1, characterized in that The pole (31) is provided with a receiving groove (312), the receiving groove (312) is communicated with the liquid injection port (311), and the liquid injection sealing nail (4) is completely received in the receiving groove (312).

3. The battery according to claim 2, characterized in that The containing groove (312) is located at the top of the pole (31), and the liquid injection port (311) is located at the bottom of the pole (31).

4. The battery according to claim 3, characterized in that The side wall of the receiving groove (312) is an inclined surface, and the bottom area of ​​the receiving groove (312) is smaller than the notch area of ​​the receiving groove (312), and the peripheral surface of the liquid injection sealing nail (4) is adapted to the side wall of the receiving groove (312).

5. The battery according to claim 4, characterized in that The area of ​​the liquid injection port (311) is smaller than the bottom area of ​​the containing groove (312).

6. The battery according to claim 1, characterized in that The cover plate assembly (3) further comprises a top cover plate (32), the periphery of which is provided with a flange structure (321), and the flange structure (321) is welded and sealed with the top port of the shell (1).

7. The battery according to claim 6, characterized in that The top cover plate (32) is configured as a sunken platform structure, the top cover plate (32) comprises a sunken platform body (322), the pole (31) is sealingly mounted on the sunken platform body (322), and the flange structure (321) is disposed on the periphery of the sunken platform body (322).

8. The battery according to claim 6 or 7, characterized in that: A mounting hole is provided in the middle of the top cover sheet (32), the pole (31) is located in the mounting hole, and a sealing ring is provided between the outer wall of the pole (31) and the inner wall of the mounting hole.

9. The battery according to claim 8, characterized in that The sealing ring comprises an outer sealing ring (33) and an inner sealing ring (34); the outer sealing ring (33) and the inner sealing ring (34) are arranged separately; the top cover sheet (32) and the shell (1) form a loading cavity (11); the outer sealing ring (33) is located outside the loading cavity (11), and the inner sealing ring (34) is located inside the loading cavity (11).

10. The battery according to claim 9, characterized in that The cover plate assembly (3) further comprises a limiting member (35), wherein the limiting member (35) is located in the loading inner cavity (11), the upper end of the limiting member (35) abuts against the top cover plate (32), and the lower end of the limiting member (35) abuts against the winding core (2).

11. The battery according to claim 10, characterized in that The cover plate assembly (3) further comprises a pressure ring (36) and a top current collecting plate (37); an annular groove (313) is provided on the periphery of the pole (31); an inner ring portion (361) of the pressure ring (36) is embedded in the annular groove (313); an outer ring portion (362) of the pressure ring (36) is welded to the top current collecting plate (37); and the top current collecting plate (37) is welded to the top pole ear of the winding core (2).

12. The battery according to claim 11, characterized in that The top current collecting disc (37) is configured as a multi-layer laminate structure, the top laminate (371) of the top current collecting disc (37) is in contact with the pole (31) and the pressure ring (36), and the bottom laminate (372) of the top current collecting disc (37) is in contact with the winding core (2).

13. The battery according to claim 12, characterized in that The periphery of the limiting member (35) is provided with an avoidance notch (351), and the avoidance notch (351) is used to avoid the top current collecting plate (37).

14. The battery according to any one of claims 1 to 7, characterized in that: A bottom current collecting plate (6) is arranged between the bottom pole ear of the winding core (2) and the bottom wall (12) of the shell (1); a boss (61) is arranged at the center of the bottom current collecting plate (6); a side of the boss (61) facing the bottom wall (12) is welded to the bottom wall (12); and a spacing space is formed between a side of the boss (61) facing the winding core (2) and the winding core (2).

15. The battery according to claim 14, characterized in that The bottom collecting plate (6) is provided with a plurality of fan-shaped platforms (62) along the radial direction. The plurality of fan-shaped platforms (62) are arranged around the periphery of the boss (61). The side of the fan-shaped platforms (62) facing the bottom wall (12) is welded to the bottom wall (12), and a spacing space is formed between the side of the fan-shaped platforms (62) facing the winding core (2) and the winding core (2).

16. The battery according to claim 15, characterized in that The fan-shaped platform (62) is provided with a vent hole (63).

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