Cylindrical battery structure

Abstract

The present application relates to a cylindrical battery structure, comprising a winding core, a shell, a positive electrode assembly, and a negative electrode assembly; one end of the shell is an open end, and the end surface of the other end of the shell is provided with a through hole, the winding core is provided in the shell, the positive electrode assembly is connected to the other end of the shell, at least a portion of the positive electrode assembly passes through the through hole and is connected to the winding core, and the negative electrode assembly is connected to the open end of the shell and the winding core; wherein the positive electrode assembly is provided with a positive electrode injection hole and a plurality of positive electrode seepage holes, and the plurality of positive electrode seepage holes are arranged at intervals along the circumference of the positive electrode injection hole, and the negative electrode assembly is provided with a negative electrode injection hole and a plurality of negative electrode seepage holes, and the plurality of negative electrode seepage holes are arranged at intervals along the circumference of the negative electrode injection hole. When the cylindrical battery structure provided by the present application is filled with electrolyte, the electrolyte can be injected not only through the positive electrode injection hole and / or the negative electrode injection hole, but also through the positive electrode seepage hole and / or the negative electrode seepage hole, which is conducive to improving the injection efficiency.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cylindrical battery structure. Background Art

[0002] With the continuous development of the new energy sector, cylindrical batteries are becoming increasingly widely used due to their advantages such as high energy density. Cylindrical batteries consist of a coil, a shell, a positive electrode collector plate, and a negative electrode collector plate. Electrolyte is typically added through an injection port located at the end of the shell.

[0003] However, due to the structural limitations of the injection hole, the electrolyte penetrates faster near the injection hole and slower away from the injection hole. This will result in uneven electrolyte penetration, long injection time, and affect the electrolyte injection efficiency. Summary of the Invention

[0004] The present application provides a cylindrical battery structure to solve technical problems such as insufficient electrolyte injection efficiency of existing batteries.

[0005] According to one aspect of the present application, a cylindrical battery structure is provided, including a winding core, a shell, a positive electrode assembly and a negative electrode assembly; one end of the shell is an open end, and the end face of the other end of the shell is provided with a through hole, the winding core is arranged in the shell, the positive electrode assembly is connected to the other end of the shell, at least a portion of the positive electrode assembly passes through the through hole and is connected to the winding core, and the negative electrode assembly is connected to the open end of the shell and the winding core; wherein, the positive electrode assembly is provided with a positive electrode injection hole and a plurality of positive electrode seepage holes, and the plurality of positive electrode seepage holes are arranged at intervals along the circumference of the positive electrode injection hole, and the negative electrode assembly is provided with a negative electrode injection hole and a plurality of negative electrode seepage holes, and the plurality of negative electrode seepage holes are arranged at intervals along the circumference of the negative electrode injection hole.

[0006] According to the cylindrical battery structure provided by the present application, when adding electrolyte, the injection can be achieved through the positive electrode injection hole of the positive electrode assembly and / or the negative electrode injection hole of the negative electrode assembly. The injection operation is more flexible and the injection efficiency is higher. In addition, since the positive electrode assembly and the negative electrode assembly are respectively provided with multiple positive electrode seepage holes and multiple negative electrode seepage holes, the electrolyte can be injected not only through the positive electrode injection hole and / or the negative electrode injection hole, but also through the positive electrode seepage hole and / or the negative electrode seepage hole. The electrolyte is dispersed by using the positive electrode seepage hole and / or the negative electrode seepage hole, so that the electrolyte can be distributed as evenly as possible on the cross section of the roll core after passing through the positive electrode assembly and / or the negative electrode assembly into the roll core, thereby improving the consistency of the electrolyte injection and helping to improve the injection efficiency. In addition, multiple holes are opened on the positive electrode assembly and the negative electrode assembly, which can reduce the weight of the positive electrode assembly and the negative electrode assembly, which is conducive to improving the energy density of the corresponding battery.

[0007] In a further preferred embodiment, the positive electrode assembly includes a positive current collecting disc, a first insulating member, a positive electrode column and a first sealing member; the positive current collecting disc is arranged in the shell and connected to the end of the winding core, and the positive current collecting disc is provided with a first liquid injection hole and the positive electrode liquid seepage hole; the first insulating member is arranged in the shell and located between the positive current collecting disc and the shell, and the first insulating member is used to separate the positive current collecting disc and the end of the winding core from the shell; the positive electrode column passes through the through hole and is connected to the side of the positive current collecting disc away from the winding core, and the positive electrode column is provided with a second liquid injection hole, wherein the second liquid injection hole is connected to the first liquid injection hole to form the positive liquid injection hole; the first sealing member is arranged outside the shell and connected to the positive electrode column to seal the second liquid injection hole.

[0008] In this solution, a first injection hole and a positive electrode seepage hole are provided on the positive electrode current collector disc, and a second injection hole is provided on the positive electrode column. This allows the electrolyte to reach the positive electrode current collector disc through the second injection hole and then be dispersed and injected through the first injection hole and the positive electrode seepage hole, which helps improve injection efficiency. Furthermore, a first insulating member is provided between the positive electrode current collector disc and the housing. This first insulating member separates the positive electrode current collector disc and the ends of the winding core from the housing to prevent short circuits.

[0009] In a further preferred embodiment, the first insulating member includes a main body and an extension portion, the main body being arranged between the positive current collecting disc and the end surface of the shell, the extension being connected to the main body and extending along the axial direction of the shell, and an end of the extension away from the main body being provided with an inclined surface.

[0010] In this solution, the main body separates the positive electrode current collector and winding core from the end face of the casing, while the extension separates them from the side wall of the casing, effectively preventing short circuits. Furthermore, an inclined surface is provided on the end of the extension away from the main body, facilitating installation of the winding core within the cavity enclosed by the main body and extension, thereby improving battery assembly efficiency.

[0011] In a further preferred solution, a groove is provided on a side of the first sealing member facing the positive electrode column.

[0012] In this solution, a groove is provided in the first seal, which can be used as an escape space when the first seal is connected to the positive electrode column, so that the first seal and the positive electrode column can be quickly positioned and aligned, and the two can be tightly connected to improve assembly efficiency.

[0013] In a further preferred embodiment, a sealed cavity is formed between the first sealing member and the positive electrode column.

[0014] In this solution, a sealed cavity is provided between the first sealing member and the positive electrode column, and the sealed cavity can be used to reserve installation space for the first sealing member, so as to ensure a sealed and secure connection between the first sealing member and the positive electrode column.

[0015] In a further preferred embodiment, the positive electrode assembly also includes a second seal, at least a portion of which is arranged between the inner wall of the through hole and the outer wall of the positive electrode column to seal the gap between the inner wall of the through hole and the outer wall of the positive electrode column. Preferably, the second seal includes a first horizontal portion and a first vertical portion, the first horizontal portion is arranged in the shell and is located between the end face and the positive electrode column, the first vertical portion is connected to the first horizontal portion to form an L-shaped structure, and the first vertical portion extends along the through hole to the outside of the shell and is respectively connected to the inner wall of the through hole and the outer wall of the positive electrode column.

[0016] In this solution, a second seal is provided between the end face of the shell and the inner wall of the through hole and the positive electrode column. The second seal can be used to seal the through hole and the positive electrode column. This can prevent the electrolyte in the shell from leaking from between the through hole and the positive electrode column, and can also prevent external impurities such as dust from entering the shell.

[0017] In a further preferred embodiment, the positive electrode assembly also includes a second insulating member, which includes a second horizontal portion and a second vertical portion. The second horizontal portion and the second vertical portion are arranged outside the shell, and the second horizontal portion is connected to the end face and the positive electrode column. The second vertical portion and the second horizontal portion are connected to form an L-shaped structure, and the second vertical portion is arranged around the periphery of the positive electrode column and connected to the positive electrode column.

[0018] In this solution, a second insulating member is provided between the outer periphery of the positive electrode column and the end face of the shell. The second insulating member can separate the positive electrode column from the shell, thereby avoiding the problem of short circuit caused by direct contact and conduction between the positive electrode column and the shell.

[0019] In a further preferred embodiment, the positive electrode assembly further includes a pressure ring, which is arranged outside the shell, and the pressure ring is sleeved outside the positive electrode column and located above the second insulating member. The positive electrode column, the second sealing member, the pressure ring, and the second insulating member are riveted to the shell via the through hole.

[0020] In this solution, a pressure ring is provided on the outer sleeve of the positive electrode column, which helps to improve the pressure resistance of the positive electrode column and the shell when they are riveted together, thereby ensuring that the positive electrode column is not damaged.

[0021] In a further preferred embodiment, the positive electrode current collecting plate includes a first body and a plurality of first welding portions protruding from the first body; the first body is provided with the first injection hole, the positive electrode seepage hole and the positive electrode positioning hole, the first injection hole is located at the center of the first body, and the positive electrode seepage hole and the positive electrode positioning hole are arranged between adjacent first welding portions; a plurality of first welding portions are arranged at intervals along the circumference of the first injection hole and each first welding portion is extended radially along the first injection hole.

[0022] In this solution, the first welding portion protrudes from the first body, facilitating welding of the first welding portion to the first insulating member of the winding core. When the electrolyte reaches the positive electrode current collector through the second liquid injection hole of the positive electrode column, the electrolyte can be dispersed and injected through the multiple positive electrode liquid infiltration holes, which helps improve the injection efficiency. At the same time, the first welding portion can also serve to enhance the structural strength of the positive electrode current collector. In addition, a positive electrode positioning hole is provided on the first body. Using the positive electrode positioning hole for positioning, the first welding portion can be precisely aligned and connected to the winding core, which helps improve the assembly efficiency of the battery.

[0023] In a further preferred embodiment, the negative electrode assembly includes a negative electrode collecting disc and a cover plate, the negative electrode collecting disc is connected to the winding core, and the cover plate is connected to the negative electrode collecting disc and the shell; wherein, the negative electrode collecting disc includes a second body and a second welding portion protruding from the second body; the second body is connected to the cover plate, and the second body is provided with the negative electrode injection hole, the negative electrode seepage hole and the negative electrode positioning hole, the negative electrode injection hole is located at the center of the second body, and the negative electrode seepage hole and the negative electrode positioning hole are arranged between adjacent second welding portions; the second welding portion is connected to the winding core, and a plurality of second welding portions are arranged at intervals along the circumference of the negative electrode injection hole.

[0024] In this solution, the second weld protrudes from the second body, facilitating welding of the second weld to the winding core. When the electrolyte is injected through the negative electrode injection port, it can be dispersed through multiple negative electrode infiltration holes, improving injection efficiency. The second weld also enhances the structural strength of the negative electrode current collector. Furthermore, the second body is provided with a negative electrode positioning hole. Using this hole, the second weld can be precisely aligned and connected to the winding core, improving battery assembly efficiency.

[0025] In a further preferred embodiment, the negative electrode current collecting disc further includes a reinforcement portion, and the reinforcement portion is connected to the outer edge of the second body.

[0026] In this solution, a reinforcement portion is provided on the outer edge of the second body, which can not only improve the structural strength of the negative electrode current collecting disc itself, but also help to improve the connection strength between the negative electrode current collecting disc, the cover plate and the shell.

[0027] In a further preferred embodiment, the negative electrode current collecting plate further includes a third welding portion, which protrudes from the second body and is distributed in a ring shape on the periphery of the negative electrode injection hole. The second welding portion, the negative electrode seepage hole and the negative electrode positioning hole are arranged between the third welding portion and the negative electrode injection hole. The cover plate is provided with an annular welding surface, which is used to cooperate with the third welding portion for welding.

[0028] In this solution, the negative electrode current collector can be welded to the cover plate by a penetration welding method (hereinafter referred to as penetration welding), wherein the third welding portion protrudes from the second body to reserve a welding surface for penetration welding, thereby cooperating with the annular welding surface of the cover plate for welding to facilitate the assembly of the negative electrode current collector and the cover plate.

[0029] In a further preferred solution, a positioning notch is provided on the edge of the second body.

[0030] In this solution, the negative electrode current collector plate can be welded to the side wall of the housing through the positioning notch on the edge of the second body (hereinafter referred to as side wall welding), so as to facilitate the assembly of the negative electrode current collector plate and the housing. At the same time, the positioning notch can also play a role in welding positioning, thereby improving welding efficiency.

[0031] In a further preferred solution, the second welding portion has a fan-shaped structure.

[0032] In this solution, the second welding portion of the fan-shaped structure can be adapted to the negative electrode current collecting plate and the negative electrode injection hole in its center, so that multiple second welding portions are evenly distributed around the periphery of the negative electrode injection hole, which is beneficial to improving the welding strength between the negative electrode current collecting plate and the cover plate.

[0033] In a further preferred embodiment, explosion-proof engraved lines are provided on the surface of the cover plate, and the explosion-proof engraved lines are arranged along the circumference of the negative electrode liquid injection hole.

[0034] In this solution, the explosion-proof engraved lines can release pressure when the air pressure in the battery is abnormal, so as to avoid electrolyte leakage as much as possible and increase the safety of the battery.

[0035] In summary, the cylindrical battery structure provided by this application has at least the following beneficial effects:

[0036] The cylindrical battery structure provided herein includes a coil, a housing, a positive electrode assembly, and a negative electrode assembly. The positive electrode assembly is provided with a positive electrode injection hole and multiple positive electrode seepage holes distributed around the positive electrode injection hole. The negative electrode assembly is provided with a negative electrode injection hole and multiple negative electrode seepage holes distributed around the negative electrode injection hole. When adding electrolyte, injection can be achieved through the positive electrode injection hole of the positive electrode assembly and / or the negative electrode injection hole of the negative electrode assembly, which provides more flexible and efficient injection operations. Furthermore, since the positive electrode assembly and the negative electrode assembly are respectively provided with a plurality of positive electrode seepage holes and a plurality of negative electrode seepage holes, the electrolyte can be injected not only through the positive electrode injection hole and / or the negative electrode injection hole, but also through the positive electrode seepage hole and / or the negative electrode seepage hole. Thus, the electrolyte is dispersed by using the positive electrode seepage hole and / or the negative electrode seepage hole, so that the electrolyte can be distributed as evenly as possible on the cross section of the winding core after passing through the positive electrode assembly and / or the negative electrode assembly and entering the winding core, thereby improving the consistency of the electrolyte injection and facilitating the improvement of the injection efficiency. In addition, by providing a plurality of holes on the positive electrode assembly and the negative electrode assembly, the weight of the positive electrode assembly and the negative electrode assembly can be reduced, which is conducive to improving the energy density of the corresponding battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0038] Figure 1 A schematic diagram of the overall structure of a cylindrical battery structure provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the exploded structure of a cylindrical battery structure provided in an embodiment of the present application;

[0040] Figure 3 A schematic cross-sectional view of a cylindrical battery structure provided in an embodiment of the present application;

[0041] Figure 4 A schematic cross-sectional view of the connection between the positive electrode assembly and the housing provided in an embodiment of the present application;

[0042] Figure 5 A schematic structural diagram of the open end of the housing provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of the structure of the through hole of the housing provided in an embodiment of the present application;

[0044] Figure 7A schematic structural diagram of a first insulating member provided in an embodiment of the present application;

[0045] Figure 8 for Figure 7 Schematic diagram of the enlarged structure of part A;

[0046] Figure 9 A schematic diagram of the overall structure of the positive electrode column provided in an embodiment of the present application;

[0047] Figure 10 A schematic diagram of the side structure of the positive electrode column provided in an embodiment of the present application;

[0048] Figure 11 A schematic diagram of the overall structure of the first sealing member provided in an embodiment of the present application;

[0049] Figure 12 A schematic side view of the first sealing member provided in an embodiment of the present application;

[0050] Figure 13 A schematic diagram of the overall structure of the second sealing member provided in an embodiment of the present application;

[0051] Figure 14 A schematic diagram of the overall structure of the second insulating member provided in an embodiment of the present application;

[0052] Figure 15 A schematic diagram of the overall structure of the pressure ring provided in an embodiment of the present application;

[0053] Figure 16 A schematic diagram of the overall structure of the positive electrode current collecting disk provided in an embodiment of the present application;

[0054] Figure 17 A schematic diagram of the overall structure of the negative electrode current collecting disk provided in an embodiment of the present application;

[0055] Figure 18 A schematic diagram of the overall structure of a negative electrode current collecting disk provided in another embodiment of the present application;

[0056] Figure 19 A schematic diagram of the overall structure of the cover provided in an embodiment of the present application;

[0057] Figure 20 This is a schematic diagram of the cross-sectional structure of the cover plate provided in an embodiment of the present application.

[0058] The reference numerals are as follows:

[0059] 100, housing; 110, open end; 120, through hole;

[0060] 200, positive electrode assembly; 210, positive electrode current collecting plate; 211, first body; 212, first welding portion; 213, first liquid injection hole; 214, positive electrode liquid seepage hole; 215, positive electrode positioning hole; 220, first insulating member; 221, body portion; 221a, mounting hole; 222, extension portion; 222a, inclined surface; 230, positive electrode column; 231, second liquid injection hole; 240, first sealing member; 241, groove; 242, sealing cavity; 250, second insulating member; 251, second horizontal portion; 252, second vertical portion; 260, second sealing member; 261, first horizontal portion; 262, first vertical portion; 270, pressure ring;

[0061] 300, negative electrode assembly; 310, negative electrode current collecting plate; 311, second body; 312, second welding part; 313, negative electrode liquid injection hole; 314, negative electrode liquid seepage hole; 315, negative electrode positioning hole; 316, reinforcement part; 317, third welding part; 318, positioning notch; 320, cover plate; 321, explosion-proof scale line; 322, annular welding surface. DETAILED DESCRIPTION

[0062] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear to indicate the orientation or position relationship, unless otherwise specified, they are understood to be based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this application.

[0063] Furthermore, the use of "first" or "second" in describing features is for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features identified. Features identified as "first" or "second" may explicitly or implicitly include at least one of the identified features. The use of the word "plurality" generally implies at least two, such as two or three, unless otherwise specifically defined.

[0064] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; mechanical connections, electrical connections, direct connections, or indirect connections through an intermediary; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0065] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it 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 application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0066] Please refer to Figures 1-20 The cylindrical battery structure provided in the embodiment of the present application includes at least a winding core, a shell 100, a positive electrode assembly 200 and a negative electrode assembly 300.

[0067] The housing 100 is cylindrical in structure, with one end of the housing 100 being an open end 110, and the other end of the housing 100 being provided with a through hole 120. For example, the through hole 120 may be a circular hole, located at the center of the end surface of the housing 100 and extending through the end surface of the housing 100, for connecting the positive electrode assembly 200 to the housing 100. For another example, the steel housing is preferably made of SPCC nickel-plated material, i.e., cold-rolled carbon steel sheet nickel-plated material.

[0068] The winding core is arranged in the shell 100. The winding core is also called a battery core. Its form is an existing structural form and will not be described in detail in the embodiments of this application.

[0069] The positive electrode assembly 200 is connected to the other end of the housing 100, that is, the end of the housing 100 provided with the through-hole 120. At least a portion of the positive electrode assembly 200 extends through the through-hole 120 and is connected to the winding core. The positive electrode assembly 200 is provided with a positive electrode liquid injection hole and a plurality of positive electrode liquid seepage holes 214. The plurality of positive electrode liquid seepage holes 214 are spaced apart along the circumference of the positive electrode liquid injection hole. For example, the positive electrode liquid injection hole can be a cylindrical hole, with the plurality of positive electrode liquid seepage holes 214 evenly distributed around the periphery of the positive electrode liquid injection hole. The positive electrode liquid injection hole and the positive electrode liquid seepage holes 214 are used to inject electrolyte into the housing 100.

[0070] The negative electrode assembly 300 is connected to the open end 110 of the housing 100 and the winding core. The negative electrode assembly 300 is provided with a negative electrode liquid injection hole 313 and multiple negative electrode liquid seepage holes 314. The multiple negative electrode liquid seepage holes 314 are spaced apart along the circumference of the negative electrode liquid injection hole 313. For example, the negative electrode liquid injection hole 313 can be a cylindrical hole, and the multiple negative electrode liquid seepage holes 314 are evenly distributed around the circumference of the negative electrode liquid injection hole 313. The negative electrode liquid injection hole 313 and the negative electrode liquid seepage holes 314 are used to inject electrolyte into the housing 100.

[0071] With the above structural design, when adding electrolyte, the electrolyte can be injected through the positive electrode injection hole of the positive electrode assembly 200 and / or the negative electrode injection hole 313 of the negative electrode assembly 300. Specifically, in some cases, the electrolyte can be injected through the positive electrode injection hole of the positive electrode assembly 200 instead of the negative electrode injection hole 313 of the negative electrode assembly 300; in some other cases, the electrolyte can be injected through the negative electrode injection hole 313 of the negative electrode assembly 300 instead of the positive electrode injection hole of the positive electrode assembly 200; in some other cases, the electrolyte can be injected through both the positive electrode injection hole of the positive electrode assembly 200 and the negative electrode injection hole 313 of the negative electrode assembly 300. The above injection method can make the injection operation more flexible and the injection efficiency higher.

[0072] Furthermore, since the positive electrode assembly 200 and the negative electrode assembly 300 are respectively provided with a plurality of positive electrode seepage holes 214 and a plurality of negative electrode seepage holes 314, the electrolyte can be injected not only through the positive electrode injection hole and / or the negative electrode injection hole 313, but also through the positive electrode seepage hole 214 and / or the negative electrode seepage hole 314, thereby utilizing the positive electrode seepage hole 214 and / or the negative electrode seepage hole 314 to disperse the electrolyte, so that after the electrolyte passes through the positive electrode assembly 200 and / or the negative electrode assembly 300 and enters the winding core, it can be distributed as evenly as possible on the cross section of the winding core, thereby improving the consistency of the electrolyte injection, which is beneficial to improving the injection efficiency, increasing the absorption rate of the electrolyte by the pole pieces of the winding core, and saving the injection time.

[0073] In addition, multiple holes are opened on the positive electrode assembly 200 and the negative electrode assembly 300, which can reduce the weight of the positive electrode assembly 200 and the negative electrode assembly 300, which is beneficial to improving the energy density of the corresponding battery and improving the battery performance.

[0074] As a further preferred embodiment, based on the above-mentioned solution, the specific embodiments of the present application may also include one or more of the following additions or combinations.

[0075] In some optional embodiments, the positive electrode assembly 200 includes a positive current collecting disc 210, a first insulating member 220, a positive electrode column 230 and a first sealing member 240; the positive current collecting disc 210 is arranged in the shell 100 and connected to the end of the winding core, and the positive current collecting disc 210 is provided with a first liquid injection hole 213 and a positive electrode seepage hole 214; the first insulating member 220 is arranged in the shell 100 and is located between the positive current collecting disc 210 and the shell 100, and the first insulating member 220 is used to separate the positive current collecting disc 210 and the end of the winding core from the shell 100; the positive electrode column 230 passes through the through hole 120 and is connected to the side of the positive current collecting disc 210 away from the winding core, and the positive electrode column 230 is provided with a second liquid injection hole 231, wherein the second liquid injection hole 231 is connected to the first liquid injection hole 213 to form a positive liquid injection hole; the first sealing member 240 is arranged in the shell 1 00 and connected to the positive electrode column 230 to block the second liquid injection hole 231.

[0076] In this embodiment, the positive electrode current collecting disc 210 is provided with a first liquid injection hole 213 and a positive electrode liquid seepage hole 214, and the positive electrode column 230 is provided with a second liquid injection hole 231. This allows the electrolyte to reach the positive electrode current collecting disc 210 through the second liquid injection hole 231 and be dispersed and injected through the first liquid injection hole 213 and the positive electrode liquid seepage hole 214, thereby improving liquid injection efficiency. Furthermore, a first insulating member 220 is provided between the positive electrode current collecting disc 210 and the housing 100. The first insulating member 220 is made of an insulating material such as PP (polypropylene). The first insulating member 220 separates the positive electrode current collecting disc 210 and the end of the winding core from the housing 100, preventing the positive electrode current collecting disc 210 and the end of the winding core from direct contact with the housing 100 and causing a short circuit.

[0077] For example, in some optional embodiments, a second liquid injection hole 231 with a diameter of 2-3 mm is provided through the center of the positive electrode column 230 to facilitate liquid injection.

[0078] For another example, the positive electrode current collecting disc 210 and / or the first sealing member 240 are preferably made of 1060 series aluminum material.

[0079] In some optional embodiments, the first insulating member 220 includes a main body portion 221 and an extension portion 222, the main body portion 221 is arranged between the positive current collecting disk 210 and the end face of the shell 100, the extension portion 222 is connected to the main body portion 221 and extends along the axial direction of the shell 100, and the extension portion 222 is provided with an inclined surface 222a at one end away from the main body portion 221.

[0080] For example, refer to Figure 7 and Figure 8The main body 221 is a circular flat plate-shaped structure. A mounting hole 221a is provided through the center of the main body 221. The mounting hole 221a can be used to position the installation of the main body 221, thereby improving assembly efficiency. In addition, when assembling the battery, the positive electrode post 230 can enter the shell 100 from the open end 110 of the shell 100, and then pass through the mounting hole 221a and the through hole 120 in sequence, and then connect the positive electrode post 230 to the shell 100 by riveting. The mounting hole 221a is preferably arranged to coincide with the center line of the through hole 120 on the end face of the shell 100, so that the positive electrode post 230 can quickly pass through the mounting hole 221a and the through hole 120 in sequence, thereby improving battery assembly efficiency.

[0081] The extension portion 222 is an annular structure that fits against the inner wall of the housing 100 and separates the positive end of the winding core formed by the flattened positive tab and the positive current collecting disk 210 from the side wall of the housing 100. In addition, the end of the extension portion 222 away from the main body 221 is provided with an inclined surface 222a so that when the winding core is installed, the winding core can pass smoothly and quickly through the end of the extension portion 222. For example, the angle between the inclined surface 222a and the inner wall of the housing 100 can be 20°-25°, that is, Figure 7 In the illustrated case, the axial angle between the inclined surface 222a and the mounting hole 221a is 20°-25°.

[0082] Thus, the main body 221 separates the positive current collecting disc 210 and the winding core from the end surface of the housing 100, while the extension 222 separates the positive current collecting disc 210 and the winding core from the side wall of the housing 100. This allows the first insulating member 220 to encase the ends of the winding core and the positive current collecting disc 210. This effectively prevents short circuits without encapsulating the winding core ends, thereby improving battery safety. Furthermore, an inclined surface 222a is provided at the end of the extension 222 facing away from the main body 221. This facilitates installation of the winding core within the cavity enclosed by the main body 221 and the extension 222, thereby improving battery assembly efficiency.

[0083] In some optional embodiments, a groove 241 is provided on the side of the first sealing member 240 facing the positive electrode column 230 . After the first sealing member 240 and the positive electrode column 230 are welded, a sealed cavity is formed between the first sealing member 240 and the positive electrode column 230 .

[0084] Reference Figure 4 、 Figures 9 to 12The groove 241 can be used as a clearance when the first seal 240 is connected to the positive electrode post 230, so that the first seal 240 and the positive electrode post 230 can be quickly positioned and aligned, and the two can be tightly connected to improve assembly efficiency. The sealed cavity 242 can be used to reserve installation space for the first seal 240 to ensure a sealed and stable connection between the first seal 240 and the positive electrode post 230.

[0085] Furthermore, a 120° chamfer is provided at the connection between the top of the positive electrode column 230 and the first sealing member 240 to facilitate the mating connection between the first sealing member 240 and the positive electrode column 230 .

[0086] For example, the first sealing member 240 may be connected to the positive electrode column 230 by laser welding or by sealant, and a groove 241 with a diameter of 0.2 mm may be provided at the center of the first sealing member 240 to provide an escape space.

[0087] In some optional embodiments, the positive electrode assembly 200 further includes a second seal 260 , at least a portion of which is disposed between the inner wall of the through hole 120 and the outer wall of the positive electrode column 230 to seal the gap between the inner wall of the through hole 120 and the outer wall of the positive electrode column 230 .

[0088] For example, the second seal 260 can be disposed inside the housing 100 and extend toward the through-hole 120. In this case, the second seal 260 can be used to seal the gap between the inner wall of the through-hole 120 and the outer wall of the positive electrode post 230. For another example, the second seal 260 can be disposed outside the housing 100 and extend toward the through-hole 120. In this case, the second seal 260 can also be used to seal the gap between the inner wall of the through-hole 120 and the outer wall of the positive electrode post 230. For another example, one second seal 260 can be disposed inside and one outside the housing 100. The second seal 260 inside the housing 100 extends from the inside of the housing 100 toward the through-hole 120, while the second seal 260 outside the housing 100 extends from the outside of the housing 100 toward the through-hole 120. In this case, the two second seals 260 can cooperate to seal the gap between the inner wall of the through-hole 120 and the outer wall of the positive electrode post 230.

[0089] In some preferred embodiments, the second seal 260 includes a first horizontal portion 261 and a first vertical portion 262, the first horizontal portion 261 is arranged in the shell 100 and is located between the end face of the shell 100 and the positive electrode column 230, the first vertical portion 262 is connected to the first horizontal portion 261 to form an L-shaped structure, and the first vertical portion 262 extends along the through hole 120 to the outside of the shell 100 and is respectively connected to the inner wall of the through hole 120 and the outer wall of the positive electrode column 230.

[0090] Reference Figure 4 and Figure 13The first horizontal portion 261 is annular and extends in the horizontal direction, and the first vertical portion 262 is annular and extends in the vertical direction, so that the cross section of the second sealing member 260 is L-shaped. Figure 4 A second sealing member 260 is provided between the end surface of the housing 100 and the inner wall of the through hole 120 and the positive electrode post 230. The second sealing member 260 can seal the through hole 120 and the positive electrode post 230, thereby preventing the electrolyte in the housing 100 from leaking from between the through hole 120 and the positive electrode post 230 and preventing external impurities such as dust from entering the housing 100.

[0091] Furthermore, the second sealing member 260 is made of an insulating material to prevent the positive electrode column 230 from being in contact with and connected to the housing 100 via the second sealing member 260 and thus causing a short circuit.

[0092] Preferably, the second sealing member 260 is made of fluororubber. More preferably, both the second sealing member 260 and the second insulating member 250 are made of rubber, thereby reducing deformation during riveting of the positive electrode assembly 200 and the housing 100, improving the appearance consistency of the overall riveted assembly, and enhancing the riveting strength.

[0093] In some optional embodiments, the positive electrode assembly 200 also includes a second insulating member 250, the second insulating member 250 includes a second horizontal portion 251 and a second vertical portion 252, the second horizontal portion 251 and the second vertical portion 252 are arranged outside the shell 100, the second horizontal portion 251 is connected to the end surface of the shell 100 and the positive electrode column 230, the second vertical portion 252 is connected to the second horizontal portion 251 to form an L-shaped structure, and the second vertical portion 252 is arranged around the periphery of the positive electrode column 230 and connected to the positive electrode column 230.

[0094] Reference Figure 4 and Figure 14 The second horizontal portion 251 is annular and extends in the horizontal direction, and the second vertical portion 252 is annular and extends in the vertical direction, so that the cross section of the second insulating member 250 is L-shaped. Figure 4 The perspective shown is for reference only. A second insulating member 250 is disposed between the outer periphery of the positive electrode column 230 and the end surface of the housing 100. The second insulating member 250 can separate the positive electrode column 230 from the housing 100, thereby preventing direct contact between the positive electrode column 230 and the housing 100 and causing a short circuit. For example, the second insulating member 250 can be made of PFA (soluble polytetrafluoroethylene) or PPS (polyphenylene sulfide).

[0095] In some optional embodiments, the positive electrode column 230 is riveted to the housing 100 via the through hole 120, such as Figure 9 and Figure 10 The diagram shows the structure of the positive electrode column 230 after riveting. It can be seen that the positive electrode column 230 is roughly in the shape of an "I" after riveting. The positive electrode assembly 200 also includes a pressure ring 270, which is arranged outside the shell 100. The pressure ring 270 is sleeved outside the positive electrode column 230 and is located above the second insulating member 250. The pressure ring 270 and the positive electrode column 230, the second insulating member 250, the second sealing member 260 and the shell 100 are riveted together as an integral whole.

[0096] Reference Figure 4 and Figure 15 The pressure ring 270 is annularly sleeved outside the positive electrode column 230. The pressure ring 270 helps to improve the pressure resistance of the positive electrode column 230 and the shell 100 when they are riveted together, thereby ensuring that the positive electrode column 230 is not damaged.

[0097] Optionally, the pressure ring 270 is made of stainless steel, which is helpful to further improve the pressure resistance of the battery.

[0098] In some optional embodiments, the positive electrode current collecting plate 210 includes a first body 211 and a plurality of first welding portions 212 protruding from the first body 211; the first body 211 is provided with a first liquid injection hole 213, a positive electrode liquid seepage hole 214 and a positive electrode positioning hole 215, the first liquid injection hole 213 is located at the center of the first body 211, and the positive electrode liquid seepage hole 214 and the positive electrode positioning hole 215 are arranged between adjacent first welding portions 212; a plurality of first welding portions 212 are arranged at intervals along the circumference of the first liquid injection hole 213 and each first welding portion 212 is extended radially along the first liquid injection hole 213.

[0099] For example, refer to Figure 16 The first body 211 is provided with eight first welding portions 212 in a cross-shaped pattern. The eight first welding portions 212 are evenly distributed around the periphery of the first liquid injection hole 213. The first body 211 is provided with a plurality of positive electrode liquid infiltration holes 214 and positive electrode positioning holes 215. The positive electrode liquid infiltration holes 214 and positive electrode positioning holes 215 are also evenly distributed around the periphery of the first liquid injection hole 213 and are arranged between adjacent first welding portions 212.

[0100] The first welding portion 212 protrudes from the first body 211. One side of the first body 211 is welded to the winding core via the first welding portion 212 by laser pulses, and the other side of the first body 211 is welded to the positive electrode column 230 via the raised portion at the center of the first body 211. In the process of the electrolyte being injected through the second injection hole 231 of the positive electrode column 230 until it reaches the negative electrode current collecting disc 310, the electrolyte can be dispersed and injected through the multiple positive electrode seepage holes 214, which is beneficial to improving the injection efficiency. At the same time, the first welding portion 212 can also serve as a reinforcement rib of the first body 211, thereby playing a role in improving the structural strength of the positive electrode current collecting disc 210. In addition, a positive electrode positioning hole 215 is also provided on the first body 211. The positive electrode positioning hole 215 is used for welding positioning to accurately align and connect the first welding portion 212 with the winding core, which is beneficial to improving the assembly efficiency of the battery.

[0101] Furthermore, after a plurality of positive electrode liquid seepage holes 214 and positive electrode positioning holes 215 are provided on the first body, it is convenient to inject the electrolyte and reduce the weight of the positive electrode current collecting plate 210, which is beneficial to improve the mass energy density of the battery and thus improve the performance of the corresponding battery.

[0102] In some optional embodiments, the negative electrode assembly 300 includes a negative electrode collecting disc 310 and a cover plate 320, the negative electrode collecting disc 310 is connected to the winding core, and the cover plate 320 is connected to the negative electrode collecting disc 310 and the shell 100; wherein, the negative electrode collecting disc 310 includes a second body 311 and a second welding portion 312 protruding from the second body 311; the second body 311 is connected to the cover plate 320, and the second body 311 is provided with a negative electrode injection hole 313, a negative electrode seepage hole 314 and a negative electrode positioning hole 315, the negative electrode injection hole 313 is located at the center of the second body 311, and the negative electrode seepage hole 314 and the negative electrode positioning hole 315 are arranged between adjacent second welding portions 312; the second welding portion 312 is welded to the winding core, and multiple second welding portions 312 are arranged at intervals along the circumference of the negative electrode injection hole 313.

[0103] For example, refer to Figure 17 The second body 311 is provided with four second welding portions 312 arranged in a cross shape. The four second welding portions 312 are evenly distributed around the periphery of the negative electrode liquid injection hole 313. The second body 311 is provided with a plurality of negative electrode liquid seepage holes 314 and negative electrode positioning holes 315. The negative electrode liquid seepage holes 314 and negative electrode positioning holes 315 are also evenly distributed around the periphery of the negative electrode liquid injection hole 313 and are located between adjacent second welding portions 312.

[0104] The second welding portion 312 protrudes from the second body 311. One side of the second body 311 is welded to the winding core via the second welding portion 312 by laser pulses, and the other side of the second body 311 is welded to the cover plate 320 via the third welding portion 317 described in the following embodiments. When the electrolyte is injected through the negative electrode injection hole 313, the electrolyte can be dispersed and injected through the multiple negative electrode seepage holes 314, which is beneficial to improving the injection efficiency. At the same time, the second welding portion 312 can also serve as a reinforcement rib of the second body 311, thereby playing a role in improving the structural strength of the negative electrode current collecting plate 310. In addition, a negative electrode positioning hole 315 is also provided on the second body 311. The second welding portion 312 and the cover plate 320 can be accurately aligned and connected by using the negative electrode positioning hole 315 for welding positioning, which is beneficial to improving the assembly efficiency of the battery.

[0105] Furthermore, after a plurality of negative electrode liquid seepage holes 314 and negative electrode positioning holes 315 are provided on the second body 311, it is convenient to inject electrolyte, and it can also reduce the weight of the negative electrode collecting plate 310, improve the mass energy density of the battery, and thus help improve the performance of the corresponding battery.

[0106] For another example, the negative electrode current collecting disk 310 is preferably made of T2 copper plated with nickel.

[0107] In some optional embodiments, the negative electrode current collecting disc 310 further includes a reinforcement portion 316 , which is connected to the outer edge of the second body 311 .

[0108] For example, the reinforcing portion 316 can be annular and connected to the outer edge of the second body 311. The reinforcing portion 316 can act as a reinforcing rib, thereby not only improving the structural strength of the negative electrode current collecting disc 310 itself, but also helping to improve the connection strength between the negative electrode current collecting disc 310, the cover plate 320 and the shell 100.

[0109] In some optional embodiments, the negative electrode current collecting plate 310 further includes a third welding portion 317, which protrudes from the second body 311 and is distributed in a ring shape around the outer periphery of the negative electrode injection hole 313, and the second welding portion 312, the negative electrode seepage hole 314 and the negative electrode positioning hole 315 are arranged between the third welding portion 317 and the negative electrode injection hole 313.

[0110] Reference Figure 17 and Figure 19 The welding method between the cover plate 320 and the negative electrode current collecting plate 310 can be penetration welding. The third welding portion 317 is configured to protrude from the second body 311 toward the cover plate. The third welding portion 317 is used to reserve a welding surface for penetration welding. A corresponding position on the cover plate 320 is provided with an annular welding surface 322 that cooperates with the third welding portion 317, thereby facilitating the assembly of the negative electrode current collecting plate 310 and the cover plate 320.

[0111] Furthermore, if penetration welding is used to connect the housing 100 and the Figure 17 When assembling the battery, the negative electrode current collecting disc 310 shown in the figure can be welded to the positive electrode current collecting disc 210 and the negative electrode current collecting disc 310 before being placed into the shell 100. After the cover plate 320 and the shell 100 are welded, the negative electrode current collecting disc 310 and the cover plate 320 are further welded by penetration welding to improve their connection strength.

[0112] In some optional embodiments, a positioning notch 318 is provided on the edge of the second body 311 .

[0113] Reference Figure 18 The second body 311 has three positioning notches 318 evenly distributed along its edge. For example, the width of the positioning notches 318 can be 1.8 mm. The negative electrode current collecting disc 310 can be welded to the sidewall of the housing 100 via the positioning notches 318 on the edge of the second body 311, facilitating assembly of the negative electrode current collecting disc 310 and the housing 100. The positioning notches 318 also serve as welding positioning, eliminating manual positioning and improving welding efficiency.

[0114] Furthermore, if the side wall welding is used to connect the housing 100 and the Figure 18 When assembling the battery, the negative electrode current collecting disc 310 shown in the figure can be welded to the positive electrode current collecting disc 210 and the negative electrode current collecting disc 310 before being placed into the shell 100. The shell 100 and the negative electrode current collecting disc 310 are then welded using side wall welding, and then the cover plate 320 is welded.

[0115] In some optional embodiments, the second welding portion 312 has a fan-shaped structure. The fan-shaped second welding portion 312 can adapt to the negative electrode current collecting disc 310 and the negative electrode liquid injection hole 313 in its center, so that multiple second welding portions 312 are evenly distributed around the periphery of the negative electrode liquid injection hole 313, which helps to improve the welding strength between the negative electrode current collecting disc 310 and the cover plate 320.

[0116] In some optional embodiments, explosion-proof score lines 321 are provided on the surface of the cover plate 320 , and the explosion-proof score lines 321 are arranged along the circumference of the negative electrode liquid injection hole 313 .

[0117] Reference Figure 19 and Figure 20 The explosion-proof score line 321 is distributed in a circular shape in a plane perpendicular to the center line of the cover plate 320 and surrounds the outer periphery of the negative electrode injection hole 313. The explosion-proof score line 321 can release pressure when the air pressure in the battery is abnormal to minimize electrolyte leakage and increase the safety of the battery.

[0118] In some preferred embodiments, the thickness of the explosion-proof scoreline 321 is not uniform. Specifically, the thickness of the explosion-proof scoreline 321 is unevenly arranged around the circumference of the negative electrode injection hole 313. For example, a certain section of the explosion-proof scoreline 321 is thinner, making it more susceptible to damage by high pressure, while another section of the explosion-proof scoreline 321 is thicker, making it less susceptible to damage by high pressure. As a result, when the air pressure in the battery becomes abnormal, the explosion-proof scoreline 321 will be partially damaged (the thinner portion), thereby releasing pressure, while the thicker portion of the explosion-proof scoreline 321 will be less susceptible to damage, thus avoiding the problem of the entire explosion-proof scoreline 321 being completely damaged, causing part of the cover plate 320 to be directly ejected by high pressure.

[0119] For example, the cover plate 320 is preferably made of SPCC nickel-plated material, that is, cold-rolled carbon steel sheet nickel-plated material.

[0120] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A cylindrical battery structure, characterized in that: It comprises a winding core, a shell (100), a positive electrode assembly (200) and a negative electrode assembly (300); One end of the shell (100) is an open end (110), and the end surface of the other end of the shell (100) is provided with a through hole (120). The winding core is provided in the shell (100), and the positive electrode assembly (200) is connected to the other end of the shell (100). At least a portion of the positive electrode assembly (200) passes through the through hole (120) and is connected to the winding core. The negative electrode assembly (300) is connected to the open end (110) of the shell (100) and the winding core. The positive electrode assembly (200) is provided with a positive electrode injection hole and a plurality of positive electrode seepage holes (214), and the plurality of positive electrode seepage holes (214) are arranged at intervals along the circumference of the positive electrode injection hole; the negative electrode assembly (300) is provided with a negative electrode injection hole (313) and a plurality of negative electrode seepage holes (314), and the plurality of negative electrode seepage holes (314) are arranged at intervals along the circumference of the negative electrode injection hole (313); The positive electrode assembly (200) comprises a positive electrode current collecting disc (210), a first insulating member (220), a positive electrode column (230) and a first sealing member (240); The positive electrode current collecting disc (210) is arranged in the housing (100) and connected to the end of the winding core, and the positive electrode current collecting disc (210) is provided with a first liquid injection hole (213) and the positive electrode liquid seepage hole (214); The first insulating member (220) is disposed in the housing (100) and is located between the positive electrode current collecting disc (210) and the housing (100), and the first insulating member (220) is used to separate the positive electrode current collecting disc (210) and the end of the winding core from the housing (100); The positive electrode column (230) passes through the through hole (120) and is connected to the side of the positive electrode current collecting disc (210) away from the winding core. The positive electrode column (230) is provided with a second liquid injection hole (231), wherein the second liquid injection hole (231) is connected with the first liquid injection hole (213) to form the positive electrode liquid injection hole, so that the electrolyte reaches the positive electrode current collecting disc (210) through the second liquid injection hole (231) and is dispersed and injected through the first liquid injection hole (213) and the positive electrode liquid seepage hole (214), which is conducive to improving the liquid injection efficiency; The first sealing member (240) is arranged outside the housing (100) and connected to the positive electrode column (230) to seal the second liquid injection hole (231); The positive electrode assembly (200) further includes a second seal (260), the second seal (260) being made of an insulating material, and at least a portion of the second seal (260) being arranged between the inner wall of the through hole (120) and the outer wall of the positive electrode column (230) to seal the gap between the inner wall of the through hole (120) and the outer wall of the positive electrode column (230).

2. The cylindrical battery structure according to claim 1, characterized in that: The first insulating member (220) comprises a main body (221) and an extension (222), the main body (221) being arranged between the positive electrode current collecting disc (210) and the end face of the shell (100), the extension (222) being connected to the main body (221) and extending along the axial direction of the shell (100), and an inclined surface (222a) being provided at one end of the extension (222) away from the main body (221); and / or A groove (241) is provided on a side of the first sealing member (240) facing the positive electrode column (230); and / or A sealed cavity (242) is formed between the first sealing member (240) and the positive electrode column (230).

3. The cylindrical battery structure according to claim 1, characterized in that: The second sealing member (260) includes a first horizontal portion (261) and a first vertical portion (262), wherein the first horizontal portion (261) is arranged in the shell (100) and is located between the end surface and the positive electrode column (230), and the first vertical portion (262) and the first horizontal portion (261) are connected to form an L-shaped structure, and the first vertical portion (262) extends along the through hole (120) to the outside of the shell (100) and is respectively connected to the inner wall of the through hole (120) and the outer wall of the positive electrode column (230).

4. The cylindrical battery structure according to claim 3, characterized in that: The positive electrode assembly (200) further includes a second insulating member (250), the second insulating member (250) including a second horizontal portion (251) and a second vertical portion (252), the second horizontal portion (251) and the second vertical portion (252) being arranged outside the shell (100), the second horizontal portion (251) being connected to the end surface and the positive electrode column (230), the second vertical portion (252) and the second horizontal portion (251) being connected to form an L-shaped structure, and the second vertical portion (252) being arranged around the outer periphery of the positive electrode column (230) and connected to the positive electrode column (230).

5. The cylindrical battery structure according to claim 4, characterized in that: The positive electrode assembly (200) further includes a pressure ring (270), which is arranged outside the shell (100). The pressure ring (270) is sleeved outside the positive electrode column (230) and is located above the second insulating member (250). The positive electrode column (230), the second sealing member (260), the pressure ring (270), and the second insulating member (250) are riveted and connected to the shell (100) via the through hole (120).

6. The cylindrical battery structure according to any one of claims 1 to 5, characterized in that: The positive electrode current collecting plate (210) comprises a first body (211) and a plurality of first welding portions (212) protruding from the first body (211); The first body (211) is provided with the first liquid injection hole (213), the positive electrode liquid seepage hole (214) and the positive electrode positioning hole (215); the first liquid injection hole (213) is located at the center of the first body (211); the positive electrode liquid seepage hole (214) and the positive electrode positioning hole (215) are arranged between adjacent first welding portions (212); A plurality of first welding portions (212) are arranged at intervals along the circumference of the first liquid injection hole (213), and each first welding portion (212) is extended along the radial direction of the first liquid injection hole (213).

7. The cylindrical battery structure according to claim 1, characterized in that: The negative electrode assembly (300) comprises a negative electrode current collecting disc (310) and a cover plate (320), wherein the negative electrode current collecting disc (310) is connected to the winding core, and the cover plate (320) is connected to the negative electrode current collecting disc (310) and the housing (100); The negative electrode current collecting plate (310) comprises a second body (311) and a second welding portion (312) protruding from the second body (311); The second body (311) is connected to the cover plate (320), and the second body (311) is provided with the negative electrode injection hole (313), the negative electrode seepage hole (314) and the negative electrode positioning hole (315). The negative electrode injection hole (313) is located at the center of the second body (311), and the negative electrode seepage hole (314) and the negative electrode positioning hole (315) are arranged between adjacent second welding parts (312); The second welding portion (312) is connected to the winding core, and a plurality of the second welding portions (312) are arranged at intervals along the circumference of the negative electrode liquid injection hole (313).

8. The cylindrical battery structure according to claim 7, characterized in that: The negative electrode current collecting disc (310) further includes a reinforcing portion (316), the reinforcing portion (316) being connected to the outer edge of the second body (311); and / or The negative electrode current collecting plate (310) further includes a third welding portion (317), the third welding portion (317) protruding from the second body (311) and distributed in an annular shape around the periphery of the negative electrode liquid injection hole (313), the second welding portion (312), the negative electrode liquid seepage hole (314) and the negative electrode positioning hole (315) are arranged between the third welding portion (317) and the negative electrode liquid injection hole (313), the cover plate (320) is provided with an annular welding surface (322), and the annular welding surface (322) is used for cooperating with the third welding portion (317) for welding; and / or The edge of the second body (311) is provided with a positioning notch (318); and / or The second welding portion (312) has a fan-shaped structure.

9. The cylindrical battery structure according to claim 7, characterized in that: The surface of the cover plate (320) is provided with explosion-proof engraved lines (321), and the explosion-proof engraved lines (321) are arranged along the circumference of the negative electrode liquid injection hole (313).

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