A cylindrical battery

Abstract

The utility model discloses a cylindrical battery, including U type casing, roll core, busbar, cover plate subassembly, one side of roll core is connected with U type casing through busbar, and the other side of roll core is connected with cover plate subassembly through the connecting piece, the busbar is integrally formed structure, and one side of busbar near roll core is equipped with fourth recess, and the other side of busbar is equipped with the first protruding of corresponding position with fourth recess, two V type protrusions are symmetrically equipped on busbar, and V type protrusion is connected with the pole lug of roll core, the middle part of busbar is equipped with the first oval punching, and the both sides of busbar are equipped with the second oval punching. The present application reduces the cost of structural member and manufacturing cost, improves battery energy density, and is convenient for same side and opposite side external module and PACK connection, reduces battery production process time, and has two explosion -proof valves simultaneously, improves battery pressure -relief safety.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a cylindrical battery. Background Technology

[0002] Most existing cylindrical batteries have a double-through structure with two cover plate assemblies installed at both ends for circumferential sealing, resulting in relatively high cost of battery structural components; The existing cylindrical battery casing does not have an explosion-proof pressure relief port on the bottom. In the event of thermal runaway, the explosion-proof pressure relief is only carried out through the cover side, which is slow and has poor safety. The existing dual-channel, dual-cover aluminum-cased batteries have the positive and negative electrodes on opposite sides of the battery. The casing is not charged, which makes it prone to electrochemical corrosion. Furthermore, the positive and negative electrodes cannot be led to the same side, which is inconvenient for the design and welding of external modules or systems, and makes assembly less convenient. The existing double-pass, double-cover cylindrical battery design reduces the space used for the internal core, resulting in low cell capacity and low battery energy density. Utility Model Content

[0003] In view of this, the present invention aims to provide a cylindrical battery to solve at least one technical problem in the prior art.

[0004] The purpose of this utility model is to propose a cylindrical lithium-ion battery structure. This cylindrical aluminum-cased battery adopts an assembly appearance of a single-opening aluminum casing and a single cover plate. At the same time, the bottom of the casing integrates a liquid injection sealing explosion-proof port, which reduces the cost of structural components and manufacturing costs, improves the battery energy density, facilitates the connection of external modules and PACKs on the same side and opposite side, reduces the battery production process time, and has two explosion-proof valves at the top and bottom to improve the battery pressure relief safety.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A cylindrical battery includes a U-shaped casing, a winding core, a busbar, and a cover assembly; One side of the core is connected to the U-shaped housing via a manifold, and the other side of the core is connected to the cover plate assembly; The busbar is a one-piece molded structure. The side of the busbar near the core is provided with a fourth groove, and the other side of the busbar is provided with a first protrusion corresponding to the position of the fourth groove. The busbar has two symmetrical V-shaped protrusions, which are connected to the pole lugs of the winding core. The manifold has a first elliptical punch in the middle and a second elliptical punch on both sides.

[0006] Furthermore, the end of the battery's U-shaped casing is provided with a boss, several thinning zones, and a liquid injection zone; The injection area of ​​the U-shaped shell is the injection hole, and the injection hole of the U-shaped shell is provided with a stepped hole for installing the sealing explosion-proof plate. A sealing explosion-proof plate is installed at the stepped hole of the U-shaped shell; The boss can be either circular or polygonal in shape.

[0007] Furthermore, the thinning zones are symmetrically arranged on both sides of the boss of the U-shaped shell; The thinning area includes a first groove and a second groove, which are respectively located on the inner and outer sides of the end of the U-shaped shell; The thinning area may include a third groove and a second protrusion, with the third groove located on the outer side of the U-shaped shell end and the second protrusion located on the inner side of the U-shaped shell end. The shape of the thinning zone can be one of the following: rectangle, square, circle, sector, ring, or semi-ring. The number of thinning zones is 2; The thickness of the thinned zone is 1 / 2 to 2 / 3 of the thickness of the shell bottom.

[0008] Furthermore, the number of first elliptical punches is 1, and the number of second elliptical punches is 2.

[0009] Furthermore, the cover plate assembly includes a cover plate, a pole, an upper plastic piece, a connecting piece, a rivet, a lower plastic piece, and a sealing ring; The cover plate has an injection hole and a sealing explosion-proof plate. The pole is installed on the cover plate through the first through hole. The explosion-proof sealing plate is located on one side of the pole post; The pole is riveted together with the cover plate, upper plastic, sealing ring and lower plastic in sequence by rivets. The upper plastic is provided between the pole and the cover plate, and the lower plastic is provided below the cover plate. The connecting piece is located below the lower plastic and is installed and connected to the bottom of the rivet.

[0010] Furthermore, the lower plastic component includes a circular plastic sheet, an arc-shaped plastic block boss, and an arc-shaped plastic strip. The circular plastic sheet, arc-shaped plastic block boss, and arc-shaped plastic strip are integrally molded structures, with the circular plastic sheet positioned below the cover plate. Two arc-shaped adhesive strips are symmetrically arranged on the circular film, and two arc-shaped adhesive block protrusions are symmetrically arranged on both sides of the arc-shaped adhesive strips; The circular film is located below the cover plate; the four arc-shaped plastic block protrusions are provided with several evenly distributed circular through holes; The connecting piece is positioned between two arc-shaped rubber block protrusions and is installed at a 90° angle to the injection hole and explosion-proof valve hole on the lower plastic.

[0011] Furthermore, the lower plastic has two symmetrically arranged L-shaped locking protrusions, and the L-shaped locking protrusions are positioned between the two arc-shaped plastic block protrusions.

[0012] Furthermore, the connecting piece includes a main disc body and a conductive handle, with the conductive handle disposed on one side of the main disc body, and the main disc body and the conductive handle being an integrally formed structure; The conductive handle includes a fixed handle and a bent handle. The fixed handle is located on one side of the bent handle. The fixed handle is fixed to the bottom of the rivet by the L-shaped locking block protrusion of the lower plastic and corresponds to the L-shaped locking block protrusion. The bent handle of the conductive handle is located between the two arc-shaped plastic block protrusions. The main body has several V-shaped stamping holes; The main body has a second through hole at its center, corresponding to the center of the winding core; The main body of the disk is evenly provided with radially arranged elliptical through holes around its perimeter; The bent handle of the conductive handle is provided with two parallel strip-shaped stamped reinforcing ribs; The main body has a first bending notch symmetrically provided on the side near the conductive handle, and a second bending notch symmetrically provided at the connection between the fixed handle and the bent handle of the conductive handle.

[0013] Furthermore, the injection hole of the cover plate is equipped with a sealing pin, which is a one-piece stamped structure. The sealing pin has a tapered step below it, and the sealing pin is installed concentrically with the injection hole.

[0014] Furthermore, the core is one of a full-tab core, a slit-tab core, or a multi-tab core.

[0015] Compared with the prior art, the cylindrical battery described in this utility model has the following advantages: 1. This design for cylindrical batteries uses a single-opening casing and a single cover plate assembly structure. Compared to batteries with a double-opening, double-cover structure, it reduces the need for one side cover plate, insulating adhesive, sealing rings, and other structural components. Furthermore, the bottom of the casing integrates an electrolyte injection and explosion-proof sealing port, significantly reducing the cost of structural components. 2. This design features explosion-proof pressure relief ports on one side of the cylindrical battery cover and one side of the casing, which provide rapid pressure relief and improve battery safety. 3. After the cylindrical battery is assembled in this solution, electrical connections can be made at opposite ends of the battery to meet the requirements for high-rate battery pack connection; at the same time, the polarity of one side can be led to the other side of the cover plate through the casing. Therefore, the positive and negative electrodes can be designed and welded as busbars for external modules or systems in the same direction and on the same side. 4. The cylindrical aluminum-cased battery in this design uses a single-pass casing, which reduces the number of cover plates on one side, improves the space utilization of the battery core, and increases the battery energy density. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the casing structure of a cylindrical battery proposed in this utility model; Figure 2 This is a side view of the casing structure of a cylindrical battery proposed in this utility model; Figure 3 for Figure 2 AA section diagram; Figure 4 for Figure 2 BB cross-section diagram; Figure 5 This is a schematic diagram of the liquid injection area of ​​the casing structure of a cylindrical battery proposed in this utility model; Figure 6 This is a schematic diagram of a combiner plate for a cylindrical battery according to the present invention. Figure 7 This is a side view of the combiner plate of a cylindrical battery proposed in this utility model. Figure 8 for Figure 6 AA section diagram; Figure 9 for Figure 6 BB cross-section diagram; Figure 10 This is a schematic diagram of a cover plate assembly for a cylindrical battery according to the present invention. Figure 11 This is a schematic diagram of the back of a cover plate assembly for a cylindrical battery according to the present invention. Figure 12 This is a schematic diagram of a sealing and explosion-proof sheet for a cylindrical battery according to the present invention. Figure 13 This is a schematic diagram of the assembly of a cylindrical battery proposed in this utility model; Figure 14 This is a schematic diagram of the other side of the assembly of a cylindrical battery according to the present invention; Figure 15 This is a schematic diagram of a multi-pole winding core of a cylindrical battery according to Embodiment 1 of this utility model; Figure 16 This invention relates to a cylindrical battery with a full-pole loop core as described in Embodiment 1 of this utility model. Figure 17 This invention relates to a stacked electrode core for a cylindrical battery, as proposed in Embodiment 1 of this utility model.

[0017] 1. U-shaped housing; 2. Boss; 3. Injection area; 301. Injection hole; 302. Stepped hole; 303. Sealing explosion-proof sheet; 4. Thinning area; 401. First groove; 402. Second groove; 5. L-shaped locking block boss; 6. Explosion-proof valve; 7. Through hole; 8. Manifold; 9. Fourth groove; 10. First protrusion; 11. V-shaped protrusion; 12. First elliptical punch; 13. Second elliptical punch; 14. Cover plate; 15. Pole post; 16. Upper plastic; 17. Connecting piece ; 1701, Main disc body; 1702, Fixing handle; 1703, Bending handle; 1704, V-shaped stamping hole; 1705, Second through hole; 1706, Elliptical through hole; 1707, Strip-shaped stamping reinforcing rib; 1708, First bending notch; 1709, Second bending notch; 18, Rivet; 19, Lower plastic; 1901, Circular film; 1902, Arc-shaped plastic block boss; 1903, Arc-shaped plastic strip; 1904, Circular through hole; 20, Explosion-proof valve; 21, Sealing ring. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1 A cylindrical battery, characterized in that it includes a U-shaped shell 1, a winding core, a busbar 8, and a cover plate assembly; one side of the winding core is connected to the U-shaped shell 1 via the busbar 8, and the other side of the winding core is connected to the cover plate assembly via a connecting piece; the busbar 8 is an integrally formed structure, with a fourth groove 9 on the side of the busbar 8 near the winding core, and a first protrusion 10 corresponding to the position of the fourth groove 9 on the other side of the busbar 8; two V-shaped protrusions 11 are symmetrically arranged on the busbar 8, and the V-shaped protrusions 11 are connected to the tabs of the winding core; a first elliptical punch 12 is provided in the middle of the busbar 8, and second elliptical punches 13 are provided on both sides of the busbar 8.

[0023] The end of the U-shaped housing 1 is provided with a boss 2, several thinning areas 4 and a liquid injection area 3; the liquid injection area 3 of the U-shaped housing 1 is a liquid injection hole 301, and the liquid injection hole 301 of the U-shaped housing 1 is provided with a stepped hole 302 for installing a sealing explosion-proof sheet 303; the sealing explosion-proof sheet 303 is installed at the stepped hole 302 of the U-shaped housing 1; the boss 2 is square in shape.

[0024] Thinning regions 4 are symmetrically arranged on both sides of the boss 2 of the U-shaped shell 1; thinning regions 4 include a first groove 401 and a second groove 402, the first groove 401 and the second groove 402 are respectively arranged on the inner and outer sides of the end of the U-shaped shell 1; The thinning zone 4 is semi-circular in shape; there are two thinning zones 4; the thickness of the thinning zone 4 is 1 / 2 to 2 / 3 of the thickness of the shell bottom.

[0025] The number of first elliptical punches 12 is 1, and the number of second elliptical punches 13 is 2.

[0026] The cover plate assembly includes a cover plate 14, an electrode post 15, an upper plastic piece 16, a connecting piece 17, a rivet 18, a lower plastic piece 19, and a sealing ring 21; the cover plate 14 is provided with an injection hole 301 and an explosion-proof valve 206, and the electrode post 15 is installed on the cover plate 14 through the first through hole 7; the explosion-proof valve 206 is located on one side of the electrode post 15; The pole post 15 is riveted together with the cover plate 14, the upper plastic 16, the sealing ring 21, and the lower plastic 19 in sequence by the rivet 18. The upper plastic 16 is provided between the pole post 15 and the cover plate 14, and the lower plastic 19 is provided below the cover plate 14. The connecting piece 17 is located below the lower plastic 19 and is installed and connected to the bottom of the rivet 18.

[0027] The lower plastic 19 includes a circular plastic sheet 1901, an arc-shaped plastic block boss 1902, and an arc-shaped plastic strip 1903. The circular plastic sheet 1901, the arc-shaped plastic block boss 1902, and the arc-shaped plastic strip 1903 are integrally molded. The circular plastic sheet 1901 is located below the cover plate 14. Two arc-shaped plastic strips 1903 are symmetrically arranged on the circular plastic sheet 1901, and two arc-shaped plastic block bosses 1902 are symmetrically arranged on both sides of the arc-shaped plastic sheet. The arc-shaped plastic strips 1903 correspond to the inner wall of the U-shaped shell 1. The arc-shaped plastic block bosses 1902 are provided with a number of evenly distributed circular through holes 1904. The connecting piece 17 is located between the two arc-shaped plastic strips 1903. The lower plastic 19 is provided with two symmetrically arranged L-shaped locking bosses 5, and the L-shaped locking bosses 5 are located between the two arc-shaped plastic block bosses 1902.

[0028] The upper plastic 16 and the lower plastic 19 are insulating materials, which can serve as insulation and fixation. The connecting piece 17 includes a main disc body 1701 and a conductive handle. The conductive handle is located on one side of the main disc body 1701, and the main disc body 1701 and the conductive handle are integrally formed. The conductive handle includes a fixed handle 1702 and a bent handle 1703. The fixed handle 1702 is located on one side of the bent handle 1703. The fixing handle 1702 is fixedly connected to the bottom of the rivet 18 by the L-shaped locking block protrusion 5 of the lower plastic 19; and corresponds to the L-shaped locking block protrusion 5. The bending handle 1703 of the conductive handle is located between two arc-shaped rubber block protrusions 1902; the main plate 1701 is provided with several V-shaped stamping holes 1704; the center of the main plate 1701 is provided with a second through hole 17057 corresponding to the center of the core; the main plate 1701 is provided with radially elliptical through holes 17067 evenly around its perimeter; the bending handle 1703 of the conductive handle is provided with two parallel strip-shaped stamping reinforcing ribs 1707; the main plate 1701 is provided with a first bending notch 1708 symmetrically on the side near the conductive handle; the connection between the fixing handle 1702 and the bending handle 1703 of the conductive handle is provided with a second bending notch symmetrically.

[0029] The sealing explosion-proof sheet 303 is a metal stamping structure, and the sealing explosion-proof sheet 303 is concentrically installed and fitted with the injection hole 301. The core is one of a full-pole lug core, a slit-lap lug core, or a multi-pole lug core.

[0030] Example 2 A cylindrical battery structure includes: a single-through U-shaped casing, a core, a busbar 8, a cover assembly, and a sealing explosion-proof sheet 303. The cylindrical battery casing is a single-through U-shaped structure with one side closed and the other side open. The bottom of the casing is a centrally stamped rectangular protrusion, which improves the positioning and electrical connection convenience during subsequent battery assembly and PACK. Two semi-annular areas are provided at the bottom, which are thinned by stamping the inner and outer sides of the casing to facilitate the penetration welding of the battery polarity at one end. At the same time, a recessed through hole 7 is provided at the bottom of the casing for electrolyte injection. After electrolyte injection, the explosion-proof sheet is welded to it to provide sealing and explosion-proof pressure relief functions. The core can be one of the following: a cut-and-stacked tab core, a multi-tab core, or a flattened full-tab core, to facilitate rapid absorption and wetting of electrolyte and high-rate battery switching. The busbar 8 is a one-piece stamped metal sheet structure with two "V-shaped" protrusions, the "V-shaped" protrusions of which are welded to the tab side of the core. Opposite to the "V-shaped" protrusion, there are two semi-annular stamped protrusions that are welded through to the recessed area inside the semi-annular part of the bottom of the casing for heat and electricity conduction. The cover assembly consists of a cover plate 14, a terminal post 15, upper insulating adhesive, a sealing ring 21, and lower plastic parts 19, riveted together with rivets 18. The conductive handle-type connecting piece 17 is welded to the other side of the core and then electrically connected to the other side of the polarity through rivets 18 and the terminal post 15. The cover assembly is equipped with an explosion-proof valve 206. After this cylindrical battery is assembled, it can be electrically connected to the opposite sides of the battery to meet the requirements of high-rate battery pack connection. At the same time, the polarity of one side can be led through the casing to the other side of the cover plate 14. Therefore, the positive and negative electrodes can be designed and welded in the same direction and on the same side for external modules or system busbars. At the same time, the bottom of the casing adopts a through welding method, reducing one side of the cover plate 14, reducing the cost of structural components, and improving the capacity and energy density of the product. In addition, the design of double explosion-proof valves 206 on the upper and lower sides improves the battery safety performance.

[0031] Example 3 The cylindrical battery structure comprises a core, a single-pass casing, a busbar 8, a cover assembly, and a sealing explosion-proof sheet 303, etc.; the core is one of a full-tab core, a slit-tab core, or a multi-tab core. Slit-tab cores or multi-tab cores are used for rapid absorption and wetting of electrolyte, while full-tab cores are suitable for high-rate batteries; core switching can be performed quickly according to core performance requirements. The cylindrical battery casing has a U-shaped structure with one side closed and the other side open. The bottom of the casing is a rectangular protrusion stamped in the center. This design facilitates positioning and electrical connection during subsequent battery assembly and packing, and improves the cost-effectiveness of high-rate electrical connections on the opposite side. Two semi-circular areas are set at the bottom. These areas are formed by stamping, and the inner and outer parts of the shell bottom are thinned to form a thinning zone 4. The residual thickness of the thinning zone 4 is about 1 / 3 to 1 / 2 of the shell bottom thickness. The thinning of the area facilitates the penetration welding of the polarity at one end of the battery, improves the welding qualification rate, and meets the requirements of high-rate charging and discharging.

[0032] The bottom of the casing is also provided with an injection hole 301, which can be used as an electrolyte injection port for the battery. After the electrolyte is injected into the injection hole 301, an explosion-proof plate is installed and welded on. This serves both as a seal and a safety pressure relief and explosion-proof function. The explosion-proof plate can be used with an initiation pressure of 0.5-1.8MPa for battery safety explosion relief. This design satisfies the electrolyte injection requirements while also providing explosion-proof and pressure relief functions, thus reducing manufacturing costs.

[0033] The busbar 8 is a one-piece stamped metal sheet structure. One side of the busbar 8 has two "V-shaped" protrusions, the ends of which are welded to the tab side of the core. Opposite to the "V-shaped" protrusions are two semi-annular stamped protrusions, which are welded through to the recessed area inside the semi-annular shell bottom for heat and electricity conduction. The busbar 8 has several elliptical perforations. These perforations facilitate the flow and absorption of electrolyte from the core, reduce the weight of the busbar 8, and increase the energy density of the battery cell.

[0034] The cover plate assembly consists of a cover plate 14, a terminal post 15, an upper insulating adhesive, a sealing ring 21, a lower plastic piece 19, and a connecting piece 17, all riveted together with rivets 18. The cover plate 14 has an injection hole 301 and an explosion-proof plate located on both sides of the terminal post 15 at a 180° angle. After battery assembly, the injection and explosion-proof functions are concentrated on one side, forming a double explosion-proof valve 206 with the bottom explosion-proof valve 206. This ensures rapid pressure relief and high safety in the event of thermal runaway. The connecting piece 17 consists of a main disc body 1701 and a conductive handle. The main disc body 1701 has a stamped shape consistent with the busbar 8, featuring three "V-shaped" stamped structures. It has a central through-hole 7 corresponding to the center of the core, and radial elliptical through-holes 17067 around its perimeter to facilitate electrolyte flow. The conductive handle has strip-shaped stamped reinforcing ribs 1707, allowing the conductive handle to be bent along predetermined notch positions.

[0035] The aforementioned sealing explosion-proof sheet 303 is a metal stamped into a thin sheet structure, and the explosion-proof sheet can be used with an initiation pressure of 0.5-1.8MPa.

[0036] The assembled cylindrical battery has the following appearance and functions; The polarity of one side of the core is led to the bottom of the shell through the busbar 8 and welded to the bottom of the shell. It is then combined with the polarity of the other side of the core to lead to the terminal post 15, forming a group welding at both ends of the battery. This method is suitable for high-rate battery pack assembly. Meanwhile, the polarity on one side of the core is welded to the bottom of the shell through the busbar 8, and the shell leads to the side of the cover plate 14, which is combined with the pole post 15. Therefore, the polarity on both sides is in the same direction and on the same side, which facilitates the design and welding of the busbar of the module or system. At the same time, the shell is charged, which can reduce electrochemical corrosion. The above two methods can be flexibly grouped or system-wide welded, and are highly cost-effective; After the cylindrical battery is assembled, the cover plate assembly has an explosion-proof valve 206 on one side, and the bottom of the battery also has an explosion-proof valve 206. When thermal runaway occurs, the explosion-proof valve 206 is installed, which has a fast pressure relief speed and high safety. Compared to the double-opening, double-cover battery structure, the single-opening casing and single-cover assembly method reduces the number of structural components such as one-side cover 14, insulating adhesive, and sealing ring 21, significantly reducing component costs. Simultaneously, the single through-hole 7 at the bottom of the casing provides liquid filling and an explosion-proof function, further lowering structural and manufacturing costs. Because the bottom of the battery is welded through and one side cover plate 14 is reduced, the space utilization of the core is improved, thereby increasing the battery capacity and energy density.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery, characterized in that: Includes U-shaped housing, core, manifold, and cover plate assembly; One side of the core is connected to the U-shaped housing via a manifold, and the other side of the core is connected to the cover plate assembly via a connecting piece; The busbar is a one-piece molded structure. The side of the busbar near the core is provided with a fourth groove, and the other side of the busbar is provided with a first protrusion corresponding to the position of the fourth groove. The busbar has two symmetrical V-shaped protrusions, which are connected to the pole lugs of the winding core. The manifold has a first elliptical punch in the middle and a second elliptical punch on both sides.

2. A cylindrical battery according to claim 1, characterized in that: The end of the battery's U-shaped casing is provided with a boss, several thinning zones, and an electrolyte injection zone; The injection area of ​​the U-shaped shell is the injection hole, and the injection hole of the U-shaped shell is provided with a stepped hole for installing the sealing explosion-proof plate. A sealing explosion-proof plate is installed at the stepped hole of the U-shaped shell; The boss can be either circular or polygonal in shape.

3. A cylindrical battery according to claim 1, characterized in that: The thinning zones are symmetrically arranged on both sides of the boss in the U-shaped shell; The thinning area includes a first groove and a second groove, which are respectively located on the inner and outer sides of the end of the U-shaped shell; The thinning area may include a third groove and a second protrusion, with the third groove located on the outer side of the U-shaped shell end and the second protrusion located on the inner side of the U-shaped shell end. The shape of the thinning zone can be one of the following: rectangle, square, circle, sector, ring, or semi-ring. The number of thinning zones is 2; The thickness of the thinned zone is 1 / 2 to 2 / 3 of the thickness of the shell bottom.

4. A cylindrical battery according to claim 1, characterized in that: The number of first elliptical punches is 1, and the number of second elliptical punches is 2.

5. A cylindrical battery according to claim 1, characterized in that: The cover plate assembly includes a cover plate, pole post, upper plastic, connecting piece, rivet, lower plastic, and sealing ring; The cover plate is provided with an injection hole and an explosion-proof valve, and the pole is installed on the cover plate through the first through hole; The explosion-proof valve is located on one side of the pole post; The pole is riveted together with the cover plate, upper plastic, sealing ring and lower plastic in sequence by rivets. The upper plastic is provided between the pole and the cover plate, and the lower plastic is provided below the cover plate. The connecting piece is located below the lower plastic and is installed and connected to the bottom of the rivet.

6. A cylindrical battery according to claim 5, characterized in that: The lower plastic part includes a circular plastic sheet, an arc-shaped plastic block boss, and an arc-shaped plastic strip. The circular plastic sheet, arc-shaped plastic block boss, and arc-shaped plastic strip are integrally molded structures. The circular plastic sheet is located below the cover plate. Two arc-shaped adhesive strips are symmetrically arranged on the circular film, and two arc-shaped adhesive block protrusions are symmetrically arranged on both sides of the arc-shaped adhesive strips; The circular film is located below the cover plate; the four arc-shaped plastic block protrusions are provided with several evenly distributed circular through holes; The connecting piece is positioned between two arc-shaped rubber block protrusions and is installed at a 90° angle to the injection hole and explosion-proof valve hole on the lower plastic.

7. A cylindrical battery according to claim 6, characterized in that: The lower plastic part has two symmetrically arranged L-shaped locking protrusions, and the L-shaped locking protrusions are positioned between the two arc-shaped plastic block protrusions.

8. A cylindrical battery according to claim 6, characterized in that: The connecting piece includes a main plate and a conductive handle. The conductive handle is located on one side of the main plate, and the main plate and the conductive handle are integrally formed. The conductive handle includes a fixed handle and a bent handle. The fixed handle is located on one side of the bent handle. The fixed handle is fixed to the bottom of the rivet by the L-shaped locking block protrusion of the lower plastic. The bent handle of the conductive handle is located between two arc-shaped rubber block protrusions; The main body has several V-shaped stamping holes; The main body has a second through hole at its center, corresponding to the center of the winding core; The main plate has radially elliptical through holes evenly distributed around its perimeter. The bent handle of the conductive handle is provided with two parallel strip-shaped stamped reinforcing ribs; The main body has a first bending notch symmetrically provided on the side near the conductive handle, and a second bending notch symmetrically provided at the connection between the fixed handle and the bent handle of the conductive handle.

9. A cylindrical battery according to claim 6, characterized in that: The sealing explosion-proof sheet is a metal stamping structure, and the sealing explosion-proof sheet is installed concentrically with the liquid injection hole.

10. A cylindrical battery according to claim 6, characterized in that: The core is one of the following: full-pole core, slit-pole core, or multi-pole core.

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