A cylindrical battery

Abstract

The utility model discloses a cylindrical battery, including U type casing, roll core, bus bar, cover plate subassembly, one side of roll core is connected with U type casing through bus bar, and the other side of roll core is connected with cover plate subassembly through connecting piece, the one side of bus bar close to roll core is equipped with the fourth recess corresponding with thinning area, and the other side of bus bar is equipped with the second protruding corresponding with the fourth recess, be equipped with several even distribution's V type protruding on the bus bar, be equipped with several even distribution's round punching on the bus bar, be equipped with several even distribution's waist type punching on the bus bar, the center of bus bar is equipped with first through -hole, this scheme cylindrical battery is single -way opening casing and single cover plate assembly structure mode, compares with double -way double -cover plate structure battery, has reduced one side cover plate, insulating glue, sealing ring etc. structural member, can greatly reduce structural member cost.

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] 1. 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; 2. Existing cylindrical batteries do not have an explosion-proof pressure relief port on the bottom of the casing. In the event of thermal runaway, explosion-proof pressure relief is only achieved through the cover side, which is slow and has poor safety. 3. 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. 4. 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. This cylindrical aluminum-cased battery reduces the cost of structural components and manufacturing costs through the assembly appearance of a single-opening aluminum casing and a single cover plate, 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 via a connecting piece; The busbar is a one-piece molded structure. The side of the busbar near the core has a fourth groove, and the other side of the busbar has a second protrusion corresponding to the fourth groove. The busbar has several evenly distributed V-shaped protrusions; the V-shaped protrusions are connected to the pole lugs on one side of the winding core; The manifold has several evenly distributed circular perforations; The manifold has several evenly distributed waist-shaped punches; The manifold has a first through hole at its center.

[0006] Furthermore, the U-shaped housing of the battery has a boss on the side away from the cover plate assembly; the end of the U-shaped housing has several thinning areas and an explosion-proof area. And / or, the shape of the boss is either circular or polygonal; And / or, the thinning area is evenly distributed at the end of the U-shaped shell, and the thinning area corresponds to the fourth groove; And / or, the thinning area includes a first groove and a second groove, the first groove and the second groove being respectively disposed on the inner and outer sides of the end of the U-shaped shell; Alternatively, the thinning area may include a third groove and a first protrusion, with the third groove located on the outer side of the U-shaped shell end and the first protrusion located on the inner side of the U-shaped shell end. And / or, the explosion-proof zone is one of the following: circular explosion-proof markings, waist-shaped explosion-proof markings, line-segment explosion-proof markings, or welded explosion-proof valve.

[0007] Furthermore, there are four thinning zones, and the thickness of each thinning zone is 1 / 2 to 2 / 3 of the thickness of the shell bottom. The thinning zone can be one of the following shapes: rectangle, square, circle, fan, or ring.

[0008] Furthermore, the number of V-shaped protrusions is four; The number of circular punches is 4; The number of waist-shaped punches is 4.

[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 is equipped with an injection hole and an explosion-proof valve, and the pole is installed on the cover plate through the second through hole; The injection port and explosion-proof valve are located on both sides of the pole; 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 on the bottom of the rivet.

[0010] Furthermore, the lower plastic includes a circular plastic sheet and an arc-shaped plastic block boss, which are integrally molded structures; The lower plastic body is set below the cover plate; four arc-shaped plastic block protrusions are equidistantly set on the circular plastic sheet, and the 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 protrusions, which 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 mounting end and 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 third 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.

[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. The cylindrical battery in this design uses a single-opening casing and a single cover plate assembly structure. Compared with the double-opening double-cover plate structure battery, it reduces the number of structural components such as one side cover plate, insulating glue, and sealing ring, which can greatly reduce the cost of structural components.

[0016] 2. This design features explosion-proof pressure relief ports on one side of the cylindrical battery cover and one side of the casing, which allow for rapid pressure relief and improve battery safety.

[0017] 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 connections. At the same time, the polarity of one side can be led through the casing to the cover side of the other side. Therefore, the positive and negative electrodes can be designed and welded in the same direction and on the same side for the busbar design of external modules or systems.

[0018] 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

[0019] 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 a U-shaped casing for a cylindrical battery according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the end face of the U-shaped casing of a cylindrical battery according to Embodiment 1 of this utility model; Figure 3 for Figure 2 A schematic diagram of AA; Figure 4 for Figure 2 A diagram of a BB; Figure 5 This is a schematic diagram of a busbar for a cylindrical battery according to Embodiment 1 of this utility model; Figure 6 This is a side view of the combiner plate of a cylindrical battery according to Embodiment 1 of this utility model; Figure 7 for Figure 5 A schematic diagram of AA; Figure 8 for Figure 5 A diagram of a BB; Figure 9 This is a schematic diagram of a cover plate assembly for a cylindrical battery according to Embodiment 1 of this utility model; Figure 10 This is a schematic diagram of the back of a cover plate assembly for a cylindrical battery according to Embodiment 1 of this utility model; Figure 11 This is a schematic diagram of a sealing pin for a cylindrical battery according to Embodiment 1 of this utility model; Figure 12 This is a cross-sectional schematic diagram of a sealing nail for a cylindrical battery according to Embodiment 1 of this utility model; Figure 13 This is a schematic diagram of a cylindrical battery according to Embodiment 1 of this utility model; Figure 14 This is a schematic diagram of the other side of a cylindrical battery according to Embodiment 1 of this utility model; 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.

[0020] 1. U-shaped shell; 2. Boss; 3. Thinning area; 301. First groove; 302. Second groove; 4. Explosion-proof area; 5. Combustion plate; 6. Fourth groove; 7. Second protrusion; 8. V-shaped protrusion; 9. Circular punch; 10. Waist-shaped punch; 11. First through hole; 12. Connecting piece; 1201. Main plate; 1202. Fixing handle; 1203. V-shaped stamping hole; 1204. Third through hole; 1205. Elliptical through hole; 1206. Strip-shaped stamped reinforcing rib; 1207. First bending notch; 1208. Second bending notch; 1209. Bending handle; 13. Cover plate; 14. Explosion-proof valve; 15. Rivet; 16. Upper plastic; 17. Injection hole; 18. Pole post; 19. Sealing ring; 20. Lower plastic; 2001. Circular film; 2002. Arc-shaped plastic block boss; 2003. Circular through hole; 21. L-shaped locking block protrusion; 24. Sealing nail. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] 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, are based on the orientation or positional relationships shown in the accompanying drawings and 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.

[0024] 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.

[0025] Example 1 like Figure 1-17 As shown, a cylindrical battery includes a U-shaped casing 1, a winding core, a junction plate 5, and a cover plate assembly. One side of the winding core is connected to the U-shaped casing 1 via the junction plate 5, and the other side of the winding core is connected to the cover plate assembly via a connecting piece 12. The junction plate 5 is an integrally formed structure. A fourth groove 6 is provided on the side of the junction plate 5 near the winding core, and a second protrusion 7 corresponding to the fourth groove 6 is provided on the other side of the junction plate 5. Several evenly distributed V-shaped protrusions 8 are provided on the junction plate 5. The V-shaped protrusions 8 are connected to the tabs on one side of the winding core. Several evenly distributed circular punches 9 are provided on the junction plate 5. Several evenly distributed waist-shaped punches 10 are provided on the junction plate 5. A first through hole 11 is provided in the center of the junction plate 5.

[0026] The battery's U-shaped casing 1 has a boss 2 on the side away from the cover plate assembly; the end of the U-shaped casing 1 has several thinning areas 3 and an explosion-proof area 4; the boss 2 is circular in shape. Thinning areas 3 are evenly distributed at the ends of the U-shaped shell 1. Thinning areas 3 correspond to the fourth groove 6. Thinning areas 3 include a first groove 301 and a second groove 302. The first groove 301 and the second groove 302 are respectively distributed on the inner and outer sides of the ends of the U-shaped shell 1. The explosion-proof zone 4 is a circular explosion-proof groove. There are 4 thinning zones 3, and the thickness of the thinning zone 3 is 1 / 2 to 2 / 3 of the thickness of the shell bottom; the shape of the thinning zone 3 is rectangular.

[0027] There are 4 V-shaped protrusions (8); 4 circular punches (9); and 4 waist-shaped punches (10).

[0028] The cover plate assembly includes a cover plate 13, an electrode post 18, an upper plastic piece 16, a connecting piece 12, a rivet 15, a lower plastic piece 20, and a sealing ring 19; the cover plate 13 is provided with an injection hole 17 and an explosion-proof valve 14, and the electrode post 18 is installed on the cover plate 13 through a second through hole; the injection hole 17 and the explosion-proof valve 14 are located on both sides of the electrode post 18; The pole post is riveted together with the cover plate 13, the upper plastic 16, the sealing ring 19, and the lower plastic 20 in sequence by rivets 15. The upper plastic 16 is provided between the pole post 18 and the cover plate 13, and the lower plastic 20 is provided below the cover plate 13. The connecting piece 12 is located below the lower plastic 20 and is installed and connected to the bottom of the rivet 15.

[0029] The lower plastic 20 includes a circular plastic sheet 2001 and an arc-shaped plastic block boss 2002, which are integrally molded structures. A circular film 2001 is positioned below the cover plate 13; four arc-shaped rubber block protrusions 2002 are equidistantly positioned on the circular film 2001, and the arc-shaped rubber block protrusions 2002 are provided with several evenly distributed circular through holes 2003; a connecting piece 12 is positioned between two arc-shaped rubber block protrusions 2002 and is installed at a 90° angle to the injection hole and explosion-proof valve hole on the lower plastic.

[0030] The lower plastic 20 has two symmetrically arranged L-shaped locking protrusions 21, and the L-shaped locking protrusions 21 are located between the two arc-shaped plastic block protrusions 2002.

[0031] The connecting piece 12 includes a main disc body 1201 and a conductive handle. The conductive handle is located on one side of the main disc body 1201, and the main disc body 1201 and the conductive handle are integrally formed. The conductive handle includes a fixing handle 1202 and a bending handle 1209. The fixing handle is located on one side of the mounting end, and the fixing handle 1209 is fixedly connected to the bottom of the rivet 15 by the L-shaped locking protrusion 21 of the lower plastic 20 and corresponds to the L-shaped locking protrusion 21. The bending handle 1209 of the conductive handle is located between two arc-shaped plastic block protrusions 2002. The main disc body 12 The main body 1201 has several V-shaped stamping holes 1203; the center of the main body 1201 has a third through hole 1204 corresponding to the center of the core; the main body 1201 has radially arranged elliptical through holes 1205 evenly distributed around its perimeter; the bending handle 1209 of the conductive handle has two parallel strip-shaped stamping reinforcing ribs 1206; the main body 1201 has a first bending notch 1207 symmetrically arranged on the side near the conductive handle, and a second bending notch 1208 symmetrically arranged at the connection between the fixing handle 1202 of the conductive handle and the bending handle 1209. During installation, the second bending notch 1208 is bent first to bend the bending handle 1209, and then the first bending notch 1207 is bent.

[0032] The cover plate 13 has a sealing nail 24 on the injection hole 17. The sealing nail 24 is an integral stamped structure. A tapered step is provided below the sealing nail 24. The sealing nail 24 is installed and fitted concentrically with the injection hole 17.

[0033] The core is one of the following: full-pole core, slit-pole core, or multi-pole core.

[0034] Example 2 This patent discloses a cylindrical battery, including: a single-through U-shaped shell, a core, a busbar, a cover assembly, and sealing pins. The cylindrical battery shell is a U-shaped single-through shell with an opening at one end and a closed end. The bottom of the shell is formed by a cylindrical protrusion stamped outward from the center, which improves the positioning and electrical connection convenience during subsequent battery assembly and PACK. Four rectangular thinning areas are evenly distributed on the bottom to facilitate the penetration welding of the battery polarity at one end, and explosion-proof grooves are provided on the bottom of the shell. The core is one of the following forms: 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 is a one-piece stamped structure made of metal sheet with four "V-shaped" protrusions. The "V-shaped" protrusions are welded to the tab side of one side of the core. In the opposite direction from the "V-shaped" protrusions, there are four rectangular stamped protrusions, which are contacted with the recessed area inside the rectangular bottom of the shell for penetration welding to conduct heat and electricity. The cover assembly consists of a cover plate, terminals, upper insulating adhesive, sealing ring, and lower plastic parts riveted together. A conductive handle-type connecting piece is welded to the other side of the core and then electrically connected to the other side's polarity via rivets and terminals. The cover assembly includes an injection hole and an explosion-proof valve. After assembly, this cylindrical battery allows for electrical connection at both ends, meeting the requirements for high-rate battery pack connections. Simultaneously, one side's polarity can be led through the casing to the other side of the cover plate. Therefore, positive and negative electrodes can be designed and welded to external modules or systems in the same direction and on the same side. Furthermore, the bottom of the casing uses through-welding, reducing the need for one side of the cover plate, lowering structural component costs, and increasing product capacity and energy density. Additionally, the design of dual explosion-proof valves on both the top and bottom sides enhances battery safety.

[0035] Example 3 The cylindrical battery comprises a core, a single-pass casing, a busbar 5, a cover plate assembly, and sealing nails 24; the core is one of a full-tab core, a folded-tab core, or a multi-tab core, and the core adopts existing technology.

[0036] Cut-and-stack 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 centrally stamped as a cylindrical protrusion, which facilitates positioning and cross-side electrical connections during subsequent battery assembly and PACKing, and improves the cost-effectiveness of cross-side high-rate electrical connections. Four rectangular areas are evenly distributed at the bottom 90°. These areas are formed by stamping, and the inner and outer parts of the shell bottom are pressed thin to form thinning area 3. The residual thickness of thinning area 3 is about 1 / 3 to 1 / 2 of the shell bottom thickness. This thinning area 3 facilitates the penetration welding of the polarity at one end of the battery, improving the welding qualification rate.

[0037] The U-shaped housing 11 also features stamped explosion-proof grooves with an initiation pressure of 0.5-1.8 MPa, used for battery safety venting. This explosion-proof stamped groove design not only reduces costs but also provides explosion-proof pressure relief, improving safety performance. The busbar 5 is a one-piece stamped metal sheet structure. One side of the busbar 5 has four V-shaped protrusions 8, the ends of which are welded to the tab side of the core. Opposite to the V-shaped protrusions 8 are four rectangular stamped protrusions, which are welded through to the recessed area inside the rectangular bottom of the casing for heat and electricity conduction. The busbar 5 has several circular and oblong perforations 10. These perforations facilitate the wetting and absorption of electrolyte by the core, reduce the weight of the busbar 5, and increase the energy density of the battery cell.

[0038] The cover plate assembly consists of a cover plate 13, a terminal post 18, an upper insulating adhesive, a sealing ring 19, a lower plastic 20, and a connecting piece 12, all riveted together with rivets 15. The cover plate 13 has an injection hole 17 and an explosion-proof valve 14 located on both sides of the terminal post 18 at a 180° angle. After battery assembly, the injection and explosion-proof functions are concentrated on one side, forming a double explosion-proof valve 14 with the bottom explosion-proof valve 14. This ensures rapid pressure relief and high safety in the event of thermal runaway. The connecting piece 12 is divided into a main disc body 1201 and a conductive handle. The main disc body 1201 has the same stamped shape as the busbar 5, with three V-shaped stamped holes 1203, a third through hole 1204 in the center corresponding to the center of the core, and radial elliptical through holes 1205 around the perimeter to facilitate electrolyte flow. The conductive handle has a strip-shaped stamped reinforcing rib 1206 structure to facilitate bending of the conductive handle along the predetermined notch position.

[0039] The sealing nail 24 is an integral stamped structure, and the tapered step facilitates concentric installation and mating with the injection hole 17.

[0040] 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 5 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 18, 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 5, and the shell leads to the side of the cover plate 13, which is combined with the pole post 18. 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 for modules or systems. At the same time, the shell is charged, which can reduce electrochemical corrosion. Both of the above can be flexibly grouped or system-wide welded, and are highly cost-effective; After the cylindrical battery is assembled, the battery explosion-proof valve 14 and the liquid injection hole 17 are concentrated on one side of the cover plate 13. The bottom of the battery also has an explosion-proof valve 14. In case of thermal runaway, the double explosion-proof valves 14 provide fast pressure relief and high safety. Compared with the double-opening, double-cover battery structure, the single-opening shell and single-cover assembly method reduces the number of structural components such as one-side cover 13, insulating adhesive (upper plastic 16, lower plastic 20), and sealing ring 19, which can greatly reduce the cost of structural components.

[0041] The upper plastic 16 and lower plastic 20 are insulating materials, which can serve as insulation and fixation.

[0042] Because the bottom of the battery is welded through and one side cover plate 13 is reduced, the space utilization of the core is improved, thereby increasing the battery capacity and energy density.

[0043] 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 has a fourth groove, and the other side of the busbar has a second protrusion corresponding to the fourth groove. The busbar has several evenly distributed V-shaped protrusions; the V-shaped protrusions are connected to the pole lugs on one side of the winding core; The manifold has several evenly distributed circular perforations; The manifold has several evenly distributed waist-shaped punches; The manifold has a first through hole at its center.

2. A cylindrical battery according to claim 1, characterized in that: The battery's U-shaped casing has a boss on the side away from the cover assembly; the end of the U-shaped casing has several thinning zones and an explosion-proof zone. And / or, the shape of the boss is either circular or polygonal; And / or, the thinning area is evenly distributed at the end of the U-shaped shell, and the thinning area corresponds to the fourth groove; And / or, the thinning area includes a first groove and a second groove, the first groove and the second groove being respectively disposed on the inner and outer sides of the end of the U-shaped shell; Alternatively, the thinning area includes a third groove and a first protrusion, with the third groove located on the outer side of the U-shaped shell end and the first protrusion located on the inner side of the U-shaped shell end; And / or, the explosion-proof zone is one of the following: circular explosion-proof markings, waist-shaped explosion-proof markings, line-segment explosion-proof markings, or welded explosion-proof valve.

3. A cylindrical battery according to claim 2, characterized in that: There are 4 thinning zones, and the thickness of each thinning zone is 1 / 2 to 2 / 3 of the thickness of the shell bottom. The thinning zone can be one of the following shapes: rectangle, square, circle, fan, or ring.

4. A cylindrical battery according to claim 2, characterized in that: There are 4 V-shaped protrusions; The number of circular punches is 4; The number of waist-shaped punches is 4.

5. A cylindrical battery according to claim 4, 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 equipped with an injection hole and an explosion-proof valve, and the pole is installed on the cover plate through the second through hole; The injection port and explosion-proof valve are located on both sides of the pole; 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 and an arc-shaped plastic block boss, which are integrally molded structures. A circular film is set below the cover plate; four arc-shaped rubber block protrusions are equidistantly set on the circular film, and the arc-shaped rubber 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 has two symmetrically arranged L-shaped protrusions, which are positioned between two arc-shaped plastic block protrusions.

8. A cylindrical battery according to claim 7, 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 mounting end and 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 third 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 liquid 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.

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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