Cylindrical battery and battery pack

Abstract

The utility model discloses a cylindrical battery and a battery pack, and belongs to the technical field of batteries, the cylindrical battery comprises a shell, and the shell is provided with an accommodating cavity and an opening communicated with the accommodating cavity in a first direction; at least part of the electrode assembly is arranged in the accommodating cavity; the first current collecting disc comprises a main disc body and a connecting part connected with the main disc body, the main disc body and the electrode assembly are arranged in the first direction, the main disc body is connected with the electrode assembly, at least part of the connecting part is arranged on the side, away from the electrode assembly, of the shell, and the connecting part is connected with the shell; and the end cover covers the opening, and the electrode assembly and the first collector plate are both located between the end cover and the shell. The electric connection precision of the first current collecting plate is improved, the overcurrent capacity of the first current collecting plate is improved, and the problems of pollution, short circuit and the like to the interior of the shell due to welding of the first current collecting plate are reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a cylindrical battery and a battery pack. Background Art

[0002] Currently, the electrical connections for current collectors in cylindrical batteries are often made using methods such as laser penetration welding to connect end caps and side welding to connect the battery casing. Laser penetration welding itself requires high tolerances for battery assembly, making it challenging to control the quality of manufactured products. Side welding, on the other hand, is often performed inside the battery casing, where dust and slag can easily enter, potentially causing internal contamination and short circuits. Utility Model Content

[0003] Purpose of the utility model: The embodiment of the present application provides a cylindrical battery, aiming to solve the above-mentioned technical problems; another purpose of the present application is to provide a battery pack using the above-mentioned cylindrical battery.

[0004] Technical solution: A cylindrical battery according to an embodiment of the present application includes:

[0005] a housing, the housing having a receiving cavity and an opening communicating with the receiving cavity in a first direction;

[0006] an electrode assembly, at least a portion of which is disposed in the accommodating cavity;

[0007] a first current collecting disk, comprising a main disk body and a connecting portion connected to the main disk body; the main disk body and the electrode assembly are arranged along the first direction, and the main disk body is connected to the electrode assembly; at least a portion of the connecting portion is provided on a side of the housing facing away from the electrode assembly, and the connecting portion is connected to the housing;

[0008] An end cover is provided on the opening, and the electrode assembly and the first current collecting plate are both located between the end cover and the shell.

[0009] In some embodiments, the housing includes a bottom wall, a first circumferential wall, and a second circumferential wall;

[0010] The bottom wall is connected to one end of the first circumferential wall in the first direction;

[0011] The second circumferential wall is provided at an end of the first circumferential wall away from the bottom wall and is connected to the first circumferential wall;

[0012] The bottom wall, the first circumferential wall, and the second circumferential wall form the accommodating cavity, the first circumferential wall and the second circumferential wall respectively surround the electrode assembly, and the opening is provided at an end of the second circumferential wall away from the bottom wall, and at least a portion of the connecting portion is connected to a side of the second circumferential wall away from the electrode assembly;

[0013] The end cover includes a main cover portion and a side portion connected to the main cover portion, the main cover portion is arranged on the side of the main disk body away from the electrode assembly, the side portion is connected to the first circumferential wall, and the side portion is arranged on the side of the connecting portion away from the second circumferential wall.

[0014] In some embodiments, the first circumferential wall includes a main body portion and an extension portion connected to each other, the main body portion and the extension portion are arranged in the first direction, and the extension portion is located on the side of the main body portion away from the bottom wall, the extension portion surrounds the second circumferential wall, the extension portion and the second circumferential wall form a clamping groove, and the extension portion and the second circumferential wall clamp the connecting portion.

[0015] In some embodiments, the connecting portion includes a plurality of connecting sub-portions, and the plurality of connecting sub-portions surround the second circumferential wall and are spaced apart.

[0016] And / or, the second circumferential wall includes a plurality of spacer portions, and the plurality of spacer portions surround the central axis of the cylindrical battery and are arranged at intervals.

[0017] In some embodiments, in a plane perpendicular to the first direction, the first circumferential wall forms a first orthographic projection, and the second circumferential wall forms a second orthographic projection;

[0018] At least a portion of the outer contour of the first orthographic projection is located outside the second orthographic projection.

[0019] In some embodiments, in a plane perpendicular to the first direction, the side portion forms a third orthographic projection, and an outer contour of the first orthographic projection surrounds an outer contour of the third orthographic projection;

[0020] Alternatively, in a plane perpendicular to the first direction, the side portion forms a third orthographic projection, and an outer contour of the first orthographic projection coincides with an outer contour of the third orthographic projection.

[0021] In some embodiments, the connecting portion surrounds the second circumferential wall, the cylindrical battery has a second direction, and the second direction intersects the first direction;

[0022] In a plane perpendicular to the first direction, the connecting portion forms a third orthographic projection, and the second circumferential wall forms a second orthographic projection;

[0023] In the second direction, the maximum size of the inner contour of the third orthographic projection is a, and the maximum size of the outer contour of the second orthographic projection is b, satisfying: |ab|<0.05 mm.

[0024] In some embodiments, the first circumferential wall has a first end and a second end oppositely disposed in the first direction, the bottom wall is connected to the first end, and the side portion is connected to the second end;

[0025] The second end is provided with a first welding groove surrounding the electrode assembly, wherein the opening of the first welding groove faces a side of the first circumferential wall away from the electrode assembly;

[0026] And / or, a second welding groove is formed on an end surface of the side portion facing the second end and surrounding the electrode assembly, and a notch of the second welding groove faces a side of the side portion away from the electrode assembly.

[0027] In some embodiments, the cylindrical battery further includes a second current collecting disc and a pole, the second current collecting disc being arranged in the accommodating cavity, the second current collecting disc being located on the side of the electrode assembly facing away from the first current collecting disc, and the second current collecting disc being connected to the electrode assembly, the pole penetrating the bottom wall in the first direction, and the pole being connected to the second current collecting disc.

[0028] Correspondingly, a battery pack described in an embodiment of the present application includes the above-mentioned cylindrical battery.

[0029] Beneficial Effects: A cylindrical battery according to an embodiment of the present application includes a housing, an electrode assembly, a first current collecting disc, and an end cap. The housing has a housing cavity and an opening communicating with the housing cavity in a first direction. At least a portion of the electrode assembly is disposed within the housing cavity. The first current collecting disc includes a main disc body and a connecting portion connected to the main disc body. The main disc body and the electrode assembly are arranged in the first direction. The main disc body is connected to the electrode assembly. At least a portion of the connecting portion is disposed on a side of the housing facing away from the electrode assembly and connected to the housing. The end cap covers the opening. The electrode assembly and the first current collecting disc are both located between the end cap and the housing. The connecting portion assists in positioning the main disc body for connection to the electrode assembly, improving the accuracy of the electrical connection of the entire first current collecting disc. The connecting portion further increases the contact area between the first current collecting disc and the housing, thereby improving the current carrying capacity of the first current collecting disc. Furthermore, at least a portion of the connecting portion is disposed outside the housing. The connecting portion and the housing can be welded outside the housing cavity, thereby preventing dust and other impurities generated by welding from entering the housing cavity and reducing contamination and short circuits within the housing caused by welding the first current collecting disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1Schematic diagram of the structure of the battery in Example 1 of the present application;

[0032] Figure 2 This is a schematic diagram of the explosion structure of the battery in Example 1 of the present application;

[0033] Figure 3 This is a structural diagram of the main cover portion viewed from the front in Example 1 of the present application;

[0034] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0035] Figure 5 yes Figure 4 A partial enlarged view of part B;

[0036] Figure 6 This is a schematic structural diagram of the battery in Example 2 of the present application;

[0037] Figure 7 This is a schematic diagram of the explosion structure of the battery in Example 2 of the present application;

[0038] Figure 8 This is a structural diagram of the main cover portion viewed from the front in Example 2 of the present application;

[0039] Figure 9 yes Figure 8 Schematic diagram of the cross-sectional structure along the CC line;

[0040] Figure 10 yes Figure 9 A partial enlarged view of part D in the middle;

[0041] Figure markings: 1. Shell; 10. Accommodating cavity; 11. Opening; 12. Bottom wall; 13. First circumferential wall; 130. Main body; 131. Extension portion; 132. First end; 133. Second end; 14. Second circumferential wall; 140. Spacer portion; 15. Clamping groove; 16. First welding groove; 2. Electrode assembly; 3. First collecting disk; 30. Main disk body; 31. Connecting portion; 310. Connecting sub-portion; 4. End cover; 40. Main cover portion; 41. Side portion; 42. Second welding groove; 43. Liquid injection hole; 44. Sealing sheet; 5. Second collecting disk; 6. Pole; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0043] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do 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 a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0044] Currently, the electrical connection of the current collecting plate of a cylindrical battery is often achieved by methods such as laser penetration welding to connect the end cap and side welding to connect the battery shell.

[0045] Laser penetration welding itself requires high tolerances for battery assembly, making it difficult to control the quality rate of manufactured products. Side welding, on the other hand, is often performed inside the battery casing, where dust and slag can easily enter, causing internal contamination and short circuits.

[0046] Furthermore, due to the structural limitations of the collector plate, the side weld provides a relatively small welding area, which not only limits the overall weld strength but also affects the cylindrical battery's current handling capacity. Setting the collector plate side height too high will excessively occupy the battery's internal space, reducing the battery's energy density. Setting the collector plate side height too low can easily cause the weld trajectory to deviate, affecting weld quality.

[0047] In view of this, combined with Figures 1 to 10 , an embodiment of the present application provides a cylindrical battery, aiming to overcome at least one of the above-mentioned technical problems.

[0048] It should be noted that, in order to facilitate the description of the structure of the cylindrical battery in the embodiment of the present application, an intersecting first direction X and second direction Y are introduced in the embodiment of the present application, wherein the first direction X is actually parallel to the axial direction of the cylindrical battery itself, and the second direction Y is actually parallel to the extension direction of any diameter of the cylindrical battery.

[0049] Reference Figures 1 to 5 A cylindrical battery includes a shell 1, an electrode assembly 2, a first current collecting plate 3 and an end cover 4.

[0050] The housing 1 has a housing cavity 10 and an opening 11 communicating with the housing cavity 10 in a first direction X. At least a portion of the electrode assembly 2 is disposed within the housing cavity 10. The first current collecting tray 3 includes a main tray body 30 and a connecting portion 31 connecting the main tray body 30. The main tray body 30 and the electrode assembly 2 are arranged along the first direction X, with the main tray body 30 connected to the electrode assembly 2. At least a portion of the connecting portion 31 is disposed on a side of the housing 1 facing away from the electrode assembly 2, where it is connected to the housing 1. An end cap 4 covers the opening 11, with the electrode assembly 2 and the first current collecting tray 3 positioned between the end cap 4 and the housing 1.

[0051] It should be noted that the first current collecting plate 3 of this embodiment corresponds to the negative electrode current collecting plate of the cylindrical battery. Figure 4 and Figure 5 One end of the electrode assembly 2 in the first direction X protrudes from the opening 11 and is connected to the main disk body 30 , and the connecting portion 31 extends toward the outside of the shell 1 in the first direction X and is connected to the shell 1 .

[0052] During the assembly of cylindrical batteries, if the electrode assembly 2 is first installed into the shell 1, the connecting portion 31 can assist the main disk body 30 in positioning and connecting the electrode assembly 2, thereby improving the accuracy of the electrical connection between the overall first collecting disk 3 and the electrode assembly 2 and the shell 1. The electrode assembly 2 can also be connected to the main disk body 30 first, and then the electrode assembly 2 can be installed into the shell 1. The design of the connecting portion 31 that fits the shell 1 has the ability to absorb tolerances, which can reduce the fitting accuracy requirements of the electrode assembly 2 and the main disk body 30 when assembled into the shell 1. That is, there are errors in the assembly positions of the electrode assembly 2 and the main disk body 30 themselves, but the electrode assembly 2 mainly relies on the connecting portion 31 to be electrically connected to the shell 1. At this time, the structure of the connecting portion 31 can be more stably connected to the shell 1, which is beneficial to improving the quality rate of the electrical connection of the negative electrode of the cylindrical battery.

[0053] At the same time, the connecting portion 31 further increases the contact area between the first current collecting disc 3 and the housing 1 , which is beneficial to improving the flow capacity of the first current collecting disc 3 .

[0054] In addition, at least part of the connecting portion 31 is arranged on the outside of the shell 1. When the connecting portion 31 and the shell 1 are side-welded, the welding position of the first collecting plate 3 and the shell 1 is located outside the accommodating cavity 10, thereby preventing impurities such as dust and welding slag generated during the welding process from entering the accommodating cavity 10, which is beneficial to reducing the pollution, short circuit and other problems inside the shell 1 caused by welding the first collecting plate 3.

[0055] Specifically, in some embodiments, referring to Figure 2 、 Figure 4 and Figure 5 The housing 1 includes a bottom wall 12 , a first circumferential wall 13 and a second circumferential wall 14 .

[0056] The bottom wall 12 is connected to one end of the first circumferential wall 13 in the first direction X. The second circumferential wall 14 is provided at an end of the first circumferential wall 13 away from the bottom wall 12 and is connected to the first circumferential wall 13. The bottom wall 12, the first circumferential wall 13, and the second circumferential wall 14 form a housing chamber 10. The first circumferential wall 13 and the second circumferential wall 14 respectively surround the electrode assembly 2, and the opening 11 is provided at the end of the second circumferential wall 14 away from the bottom wall 12. The connecting portion 31 extends in the first direction X to the side of the second circumferential wall 14 facing away from the electrode assembly 2, and the connecting portion 31 is connected to the second circumferential wall 14. To improve the structural strength of the overall housing 1, the bottom wall 12, the first circumferential wall 13, and the second circumferential wall 14 can be integrally formed.

[0057] The end cover 4 includes a main cover portion 40 and a side portion 41 connected to the main cover portion 40 .

[0058] The main cover portion 40 is arranged on the side of the main disk body 30 away from the electrode assembly 2, and the side portion 41 extends in the first direction X to the side of the connecting portion 31 away from the second circumferential wall 14. The side portion 41 surrounds the connecting portion 31, and the side portion 41 is connected to the first circumferential wall 13 at one end away from the main cover portion 40 in the first direction X.

[0059] In addition, if Figure 2 and Figure 4 The main cover 40 is also provided with an injection hole 43 and a sealing sheet 44 for sealing the injection hole 43. The electrolyte is injected into the accommodating cavity 10 from the injection hole 43. After the injection is completed, it can be sealed by the sealing sheet 44 to prevent leakage of the electrolyte.

[0060] During the actual assembly process, the main disk body 30 is welded to the electrode assembly 2 in advance. After the electrode assembly 2 is installed into the shell 1, the connecting portion 31 can fit with the second circumferential wall 14. The connecting portion 31 and the second circumferential wall 14 can be welded, thereby realizing the electrical connection between the first collecting disk 3 and the electrode assembly 2 and the shell 1.

[0061] After the first current collecting disc 3 is welded to the shell 1 , the end cover 4 is assembled with the shell 1 and sealed by welding, that is, the main cover 40 and the side portion 41 cover the opening 11 and the first current collecting disc 3 to seal the first current collecting disc 3 and the electrode assembly 2 .

[0062] In some embodiments, reference Figure 2 and Figure 5 The connecting portion 31 includes a plurality of connecting sub-portions 310 , and the plurality of connecting sub-portions 310 surround the second circumferential wall 14 and are arranged at intervals.

[0063] It can be understood that the plurality of connecting sub-portions 310 surround and connect the second circumferential wall 14, which is beneficial to improving the stability of the connection between the connecting portion 31 and the second circumferential wall 14. Figure 2The connecting sub-portion 310 can be configured as an arc-shaped sheet structure to conform to the outer peripheral contour of the second circumferential wall 14. The orthographic projection of the large surface of the connecting sub-portion 310 within the plane defined by the first direction X and the second direction Y can be a rectangle. In other embodiments, other polygonal or circular shapes can also be used, which will not be described in detail here.

[0064] Furthermore, in some embodiments, the connecting portion 31 may also be an annular structure that entirely surrounds the second circumferential wall. This differs from a design with multiple connecting sub-portions 310 in that the integral annular connecting portion 31 provides a larger flow area for the cylindrical battery, allowing the design structure of the connecting portion 31 to be flexibly adjusted as needed. It is understood that the distributed design of multiple connecting sub-portions 310, due to its greater deformability, can more easily accommodate the tolerances of the electrode assembly 2 and the main disk 30 when installed in the housing 1, compared to a integral annular connecting portion 31.

[0065] In some embodiments, reference Figure 2 and Figure 5 In this embodiment, the second circumferential wall 14 is configured as an annular structure surrounding the electrode assembly 2. It is understood that in other embodiments, the second circumferential wall 14 may also include a plurality of spacer portions 140, and the plurality of spacer portions 140 are spaced apart and arranged around the central axis of the cylindrical battery.

[0066] Similarly, the spacer portion 140 can also be configured as an arc-shaped sheet structure to conform to the circumferential contour of the first circumferential wall 13. The orthographic projection of the large surface of the spacer portion 140 within the plane defined by the first direction X and the second direction Y can be a rectangle. In other embodiments, other polygonal or circular shapes can also be used, which will not be further described here.

[0067] In addition, it should be noted that, in some embodiments, reference Figure 2 、 Figure 4 and Figure 5 In a plane perpendicular to the first direction X, the first circumferential wall 13 forms a first orthographic projection, and the second circumferential wall 14 forms a second orthographic projection. An outer contour of at least part of the first orthographic projection is located outside the second orthographic projection.

[0068] Specifically, such as Figure 4 and Figure 5 As shown, in this embodiment, the second circumferential wall 14 is completely arranged in the first circumferential wall 13 as an example. At this time, the corresponding shell 1 forms a necking design at the opening 11, which is conducive to the assembly of the connecting part 31 and reduces the influence of the connecting part 31 on the overall shape of the cylindrical battery.

[0069] On this basis, in some embodiments, reference Figure 2 、 Figure 4 and Figure 5In a plane perpendicular to the first direction X, the side portion 41 forms a third orthographic projection, and the outer contour of the first orthographic projection coincides with the outer contour of the third orthographic projection.

[0070] Specifically, such as Figure 4 and Figure 5 As shown, in this embodiment, when the integral end cover 4 covers the opening 11, the end cover 4 and the shell 1 form a cylindrical shape, that is, the constriction formed on the shell 1 at the opening 11 is designed as the side portion 41 and provides an assembly avoidance space to avoid the side portion 41 protruding from the first circumferential wall 13 in the second direction Y.

[0071] Furthermore, it is understood that in other embodiments, the outer contour of the first orthographic projection may surround the outer contour of the third orthographic projection, or the outer contour of the third orthographic projection may surround the outer contour of the first orthographic projection, in a plane perpendicular to the first direction X. In terms of structure, the side portion 41 is located inside the first circumferential wall 13 or protrudes from the first circumferential wall 13 in the second direction Y.

[0072] In some embodiments, reference Figure 4 , in the second direction Y, the maximum size of the inner contour of the third orthographic projection is a, and the maximum size of the outer contour of the second orthographic projection is b, satisfying: |ab|<0.05mm.

[0073] Specifically, in some embodiments, the connection portion 31 and the second circumferential wall 14 may be clearance-fitted, where the clearance between the connection portion 31 and the second circumferential wall 14 is less than 0.05 mm. When the clearance between the connection portion 31 and the second circumferential wall 14 is greater than or equal to 0.05 mm, the connection portion 31 and the second circumferential wall 14 are prone to poor fit, which can easily lead to cold welds.

[0074] In some embodiments, the connection portion 31 and the second circumferential wall 14 may also be an interference fit, with the maximum interference between the connection portion 31 and the second circumferential wall 14 being less than 0.05 mm. When the interference fit is greater than or equal to 0.05 mm, the connection portion 31 and the second circumferential wall 14 may easily interfere with each other, resulting in the problem of not being able to be smoothly installed in the housing 1.

[0075] In some embodiments, reference Figure 4 and Figure 5 The first circumferential wall 13 has a first end 132 and a second end 133 that are oppositely arranged in the first direction X, the bottom wall 12 is connected to the first end 132 , and the side portion 41 is connected to the second end 133 .

[0076] The second end 133 defines a first welding groove 16 surrounding the electrode assembly 2 . The opening of the first welding groove 16 faces the side of the first circumferential wall 13 away from the electrode assembly 2 .

[0077] In some embodiments, similarly, a second welding groove 42 is formed on the end surface of the side portion 41 facing the second end 133 around the electrode assembly 2 , and the notch of the second welding groove 42 faces the side of the side portion 41 away from the electrode assembly 2 .

[0078] The welding groove structure formed by the butt joint of the first welding groove 16 and the second welding groove 42 facilitates providing a solder melting area for the sealing welding end cover 4 .

[0079] In addition, in some embodiments, the first current collecting disc 3 shown in this embodiment is a negative electrode current collecting disc, and the cylindrical battery further includes a second current collecting disc 5 and a terminal 6. The second current collecting disc 5 corresponds to the positive electrode current collecting disc of the cylindrical battery. The second current collecting disc 5 is disposed in the accommodating cavity 10. The second current collecting disc 5 is located on the side of the electrode assembly 2 facing away from the first current collecting disc 3 and is connected to the electrode assembly 2. The terminal 6 extends through the bottom wall 12 in the first direction X and is connected to the second current collecting disc 5.

[0080] Furthermore, in some embodiments, reference Figures 5 to 10 , which is different from the above embodiment, is that the first circumferential wall 13 includes a main body portion 130 and an extension portion 131 connected to each other, the main body portion 130 and the extension portion 131 are arranged in the first direction X, and the extension portion 131 is located on the side of the main body portion 130 away from the bottom wall 12, and the extension portion 131 surrounds the outer periphery of the second circumferential wall 14.

[0081] Specifically, based on the constricted design of the second circumferential wall 14, the extension portion 131 can form a clamping groove 15 with the second circumferential wall 14. The connecting portion 31 extends into the clamping groove 15, and the extension portion 131 and the second circumferential wall 14 clamp the connecting portion 31. This helps improve the assembly stability of the connecting portion 31 and further increases the contact area between the connecting portion 31 and the housing 1, thereby improving the flow capacity of the connecting portion 31.

[0082] In addition, it should be noted that, referring to Figure 10 The second end 133 is located on the side of the extension portion 131 away from the main body portion 130, and at this time the second end 133 is flush with the end of the second circumferential wall 14 away from the first circumferential wall 13 in the first direction X, the side portion 41 is connected to the second end 133, and the corresponding first welding groove 16 is actually provided on the extension portion 131.

[0083] Accordingly, an embodiment of the present application provides a battery pack, which includes the above-mentioned battery. It is understandable that the battery pack can have all the technical features and corresponding beneficial effects of the above-mentioned battery, which will not be repeated here.

[0084] The above is a detailed introduction to a battery and a battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylindrical battery, characterized in that: include: A housing (1), the housing (1) having a receiving cavity (10) and an opening (11) communicating with the receiving cavity (10) in a first direction (X); an electrode assembly (2), at least a portion of the electrode assembly (2) being disposed in the accommodating cavity (10); A first current collecting disk (3), comprising a main disk body (30) and a connecting portion (31) connected to the main disk body (30); the main disk body (30) and the electrode assembly (2) are arranged along the first direction (X), and the main disk body (30) is connected to the electrode assembly (2); at least a portion of the connecting portion (31) is provided on a side of the housing (1) facing away from the electrode assembly (2), and the connecting portion (31) is connected to the housing (1); An end cover (4) is provided to cover the opening (11), and the electrode assembly (2) and the first current collecting plate (3) are both located between the end cover (4) and the shell (1).

2. The cylindrical battery according to claim 1, characterized in that: The housing (1) comprises a bottom wall (12), a first circumferential wall (13) and a second circumferential wall (14); The bottom wall (12) is connected to one end of the first circumferential wall (13) in the first direction (X); The second circumferential wall (14) is provided at one end of the first circumferential wall (13) away from the bottom wall (12) and is connected to the first circumferential wall (13); The bottom wall (12), the first circumferential wall (13) and the second circumferential wall (14) enclose the accommodating cavity (10); the first circumferential wall (13) and the second circumferential wall (14) respectively surround the electrode assembly (2); the opening (11) is provided at an end of the second circumferential wall (14) away from the bottom wall (12); and at least a portion of the connecting portion (31) is connected to a side of the second circumferential wall (14) away from the electrode assembly (2); The end cover (4) includes a main cover portion (40) and a side portion (41) connected to the main cover portion (40), the main cover portion (40) is arranged on a side of the main disk body (30) away from the electrode assembly (2), the side portion (41) is connected to the first circumferential wall (13), and the side portion (41) is arranged on a side of the connecting portion (31) away from the second circumferential wall (14).

3. The cylindrical battery according to claim 2, characterized in that: The first circumferential wall (13) includes a main body portion (130) and an extension portion (131) connected to each other. The main body portion (130) and the extension portion (131) are arranged in the first direction (X), and the extension portion (131) is located on the side of the main body portion (130) away from the bottom wall (12). The extension portion (131) surrounds the second circumferential wall (14). The extension portion (131) and the second circumferential wall (14) are surrounded by a clamping groove (15), and the extension portion (131) and the second circumferential wall (14) clamp the connecting portion (31).

4. The cylindrical battery according to claim 2, characterized in that: The connecting portion (31) includes a plurality of connecting sub-portions (310), and the plurality of connecting sub-portions (310) surround the second circumferential wall (14) and are arranged at intervals; And / or, the second circumferential wall (14) includes a plurality of spacer portions (140), and the plurality of spacer portions (140) surround the central axis of the cylindrical battery and are arranged at intervals.

5. The cylindrical battery according to claim 2, characterized in that: In a plane perpendicular to the first direction (X), the first circumferential wall (13) forms a first orthographic projection, and the second circumferential wall (14) forms a second orthographic projection; At least a portion of the outer contour of the first orthographic projection is located outside the second orthographic projection.

6. The cylindrical battery according to claim 5, characterized in that: In a plane perpendicular to the first direction (X), the side portion (41) forms a third orthographic projection, and the outer contour of the first orthographic projection surrounds the outer contour of the third orthographic projection; Alternatively, in a plane perpendicular to the first direction (X), the side portion (41) forms a third orthographic projection, and an outer contour of the first orthographic projection coincides with an outer contour of the third orthographic projection.

7. The cylindrical battery according to claim 2, characterized in that: The connecting portion (31) surrounds the second circumferential wall (14), the cylindrical battery has a second direction (Y), and the second direction (Y) intersects the first direction (X); In a plane perpendicular to the first direction (X), the connecting portion (31) forms a third orthographic projection, and the second circumferential wall (14) forms a second orthographic projection; In the second direction (Y), the maximum size of the inner contour of the third orthographic projection is a, and the maximum size of the outer contour of the second orthographic projection is b, satisfying: |ab|<0.05mm.

8. The cylindrical battery according to claim 2, characterized in that: The first circumferential wall (13) has a first end (132) and a second end (133) arranged opposite to each other in the first direction (X), the bottom wall (12) is connected to the first end (132), and the side portion (41) is connected to the second end (133); The second end (133) is provided with a first welding groove (16) surrounding the electrode assembly (2), and the notch of the first welding groove (16) faces the side of the first circumferential wall (13) away from the electrode assembly (2); And / or, a second welding groove (42) is provided on the end surface of the side portion (41) facing the second end (133) around the electrode assembly (2), and the notch of the second welding groove (42) faces the side of the side portion (41) away from the electrode assembly (2).

9. The cylindrical battery according to claim 2, characterized in that: The cylindrical battery further includes a second current collecting disc (5) and a pole (6), wherein the second current collecting disc (5) is arranged in the accommodating cavity (10), the second current collecting disc (5) is located on a side of the electrode assembly (2) away from the first current collecting disc (3), and the second current collecting disc (5) is connected to the electrode assembly (2), the pole (6) passes through the bottom wall (12) in the first direction (X), and the pole (6) is connected to the second current collecting disc (5).

10. A battery pack, characterized in that: The invention comprises a cylindrical battery as claimed in any one of claims 1 to 9.

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