Cylindrical battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a cylindrical battery and an electric device. The cylindrical battery comprises a shell, a cover plate and a battery cell, wherein the shell is provided with an opening; the cover plate covers the opening; the battery cell is arranged in the shell and comprises a battery cell main body and at least one first tab, the at least one first tab is led out from the end face of one end of the battery cell main body and is bent in the direction opposite to the center of the battery cell main body, and the first tab, the shell and the cover plate are integrally welded. According to the cylindrical battery and the electric device provided by the utility model, the welding process for assembling the cylindrical battery is reduced, and the production and assembly efficiency of the cylindrical battery is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery and an electrical device. Background Art

[0002] Cylindrical batteries are one of the important product forms of new energy power batteries. Due to their high energy density and low manufacturing cost, they are widely used in new energy vehicles and other electrical devices.

[0003] In the prior art, cylindrical batteries typically include a housing, a cover plate, a positive current collector plate, a negative current collector plate, a battery cell, and a positive electrode post. To achieve electrical connection between the various components, at least five welding steps are required when assembling a cylindrical battery. These steps include welding the positive current collector plate to the positive tab of the battery cell, welding the negative current collector plate to the negative tab of the battery cell, welding the positive current collector plate to the positive electrode post, welding the negative current collector plate to the housing, and finally welding the housing to the cover plate. This indicates that the prior art cylindrical batteries require numerous welding steps, resulting in low production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a cylindrical battery and an electrical device to solve the problems of multiple welding processes and low production efficiency in the prior art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Cylindrical batteries, including:

[0007] a housing, wherein the housing is a cylindrical structure having an opening;

[0008] a cover plate, the cover plate covering the opening;

[0009] A battery cell is arranged in the shell and includes a battery cell body and at least one first pole tab, at least one first pole tab is led out from the end face of one end of the battery cell body and bent in a direction away from the center of the battery cell body, and the first pole tab, the shell and the cover plate are welded as one.

[0010] Optionally, the edge of the cover plate is provided with a folded edge, and the end of the first tab away from the battery cell body is folded until it contacts the outer peripheral wall surface of the shell to form a folded portion, and the folded portion, the folded edge and the shell are welded as one.

[0011] Optionally, the folding portion, the folding edge and the outer peripheral wall of the shell are welded together to form a welding portion, and the welding portion is partially located inside the folding edge, partially located inside the folding portion, and partially located inside the shell. The welding portion seals the gap between the folding portion and the folding edge, and seals the gap between the folding portion and the shell. The extension direction of the welding portion is 30°-45° to the second direction, wherein the second direction is perpendicular to the axial direction of the shell.

[0012] Optionally, the length of the folded edge in the first direction is 3 mm to 7 mm; and / or the thickness of the folded edge is 0.5 mm to 0.8 mm, and the first direction is the axial direction of the shell.

[0013] Optionally, the orthographic projection of the folded portion in the second direction is located within the folded edge, and the minimum distance between the edge of the folded edge facing away from the cover plate and the edge of the folded portion is 0-1 mm, and the second direction is perpendicular to the axial direction of the shell.

[0014] Optionally, the first electrode tab comprises multiple layers of electrode tabs sequentially arranged along a preset direction, and each layer of electrode tabs has the folded portion; wherein the preset direction is perpendicular to the axis direction of the battery cell body;

[0015] The heights of the tabs in the same layer are the same, and the heights of the tabs gradually decrease in the direction from the center of the battery cell body to the edge.

[0016] Optionally, the height difference between two adjacent layers of the tabs in the preset direction is 0.3 mm to 0.4 mm; and / or,

[0017] The height of the innermost tab of the multiple tabs closest to the center of the battery cell body is 18 mm to 22 mm; and / or,

[0018] The height of the outer tab that is the longest distance from the center of the battery cell body in the preset direction is 2 mm to 6 mm.

[0019] Optionally, the first electrode tab includes a plurality of electrode tabs, and the end surfaces of the folded portions of the plurality of electrode tabs facing away from one end of the cover plate are flush.

[0020] Optionally, the cylindrical battery further includes a protective pad, which is provided between a preset end surface of the shell and the first tab; and / or the preset end surface of the shell is a curved surface, and the first tab contacts the preset end surface;

[0021] Wherein, the preset end face is the end face of the shell where the opening is provided.

[0022] An electric device includes the cylindrical battery as described above.

[0023] Beneficial effects of the utility model:

[0024] The cylindrical battery and electrical device provided in this embodiment include a battery cell including a battery cell body and at least one first pole ear. The first pole ear is led out from the end face of one end of the battery cell body and bent in a direction away from the center of the battery cell body, so that the end of the first pole ear facing away from the battery cell body can extend toward the edge of the cover plate and the side wall of the shell, and can contact the edge of the cover plate and the side wall of the shell, and the first pole ear, the shell and the cover plate can be welded as a whole. On the one hand, the first pole ear is directly welded to the cover plate without the need to set a collecting plate, thereby increasing the height of the battery cell body while keeping the height of the shell unchanged, thereby increasing space utilization and improving the energy density of the cylindrical battery. On the other hand, the first pole ear, the shell and the cover plate can be connected into a whole in a single welding process, reducing at least two welding processes between the pole ear and the shell and between the shell and the cover plate to one welding, reducing the welding process of assembling cylindrical batteries, and thereby improving the production and assembly efficiency of cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional view of a cylindrical battery provided by the present invention. Figure 1 ;

[0026] Figure 2 It is a schematic diagram of the battery cell provided by the utility model;

[0027] Figure 3 It is a schematic diagram of the cover provided by the utility model;

[0028] Figure 4 It is a partial enlarged view of the cross-sectional view of the cylindrical battery provided by the present invention;

[0029] Figure 5 This is a cross-sectional view of a cylindrical battery provided by the present invention. Figure 2 ;

[0030] Figure 6 It is a schematic diagram of the protective pad provided by the utility model;

[0031] Figure 7 It is a partial enlarged view of the shell provided by the utility model.

[0032] In the picture:

[0033] 100, shell; 110, opening; 120, shell end face; 200, cover; 210, folded edge; 220, liquid injection hole; 300, battery cell; 310, battery cell body; 311, first end; 312, second end; 320, first pole ear; 321, folded portion; 330, second pole ear; 340, center hole; 350, positive collecting plate; 400, protective pad; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0039] like Figures 1 to 7 As shown, this embodiment provides a cylindrical battery, which can reduce the number of welding times during the assembly process of the cylindrical battery and improve the production efficiency of the cylindrical battery.

[0040] For example, the cylindrical battery includes a shell 100, a cover plate 200 and a battery cell 300. The shell 100 has an opening 110. For example, the shell 100 can be cylindrical. In this embodiment, at least one end of the shell 100 in the axial direction is provided with an opening 110. In this embodiment, Figure 1 and Figure 7 As shown, the housing 100 is Figure 1 The top end is shown as having an opening 110. A cover plate 200 covers the opening 110, thereby forming a relatively closed inner cavity in conjunction with the housing 100. In this embodiment, the number of cover plates 200 is the same as the number of openings 110, and they correspond one to one. Each cover plate 200 is used to cover its corresponding opening 110.

[0041] In this embodiment, a battery cell 300 is disposed within the housing 100 and includes a battery cell body 310 and at least one first electrode tab 320. For example, the battery cell body 310 may be a wound core structure with a central hole 340 formed therein. This embodiment is not limited thereto. In this embodiment, multiple first electrode tabs 320 are provided.

[0042] like Figure 1 As shown, at least one first tab 320 extends from an end surface of the battery cell body 310 and is bent in a direction away from the center of the battery cell body 310. That is, the first tab 320 is bent toward the outer edge of the battery cell body 310. In addition, the first tab 320, the housing 100, and the cover plate 200 are welded together as an integral whole, so that the first tab 320, the housing 100, and the cover plate 200 can be connected in a single welding process, thereby reducing the number of welding operations and improving the assembly efficiency of the cylindrical battery.

[0043] When assembling the cylindrical battery provided in this embodiment, the battery cell 300 is placed in the shell 100, and then, each first pole ear 320 on the battery cell body 310 is bent in a direction away from the center of the battery cell body 310, so that each first pole ear 320 can extend to the edge of the cover plate 200 and the side wall of the shell 100, and then, the cover plate 200 is covered at the opening 110, and cooperates with the shell 100 to clamp the first pole ear 320, and then, by welding, the cover plate 200, the first pole ear 320 and the shell 100 are welded at the position where the first pole ear 320 contacts the cover plate 200 and the shell 100, so that the three are connected into one.

[0044] The cylindrical battery provided in this embodiment includes a battery cell 300 including a battery cell body 310 and at least one first tab 320. The first tab 320 is led out from the end face of one end of the battery cell body 310 and bent in a direction away from the center of the battery cell body 310, so that the end of the first tab 320 facing away from the battery cell body 310 can extend toward the edge of the cover plate 200 and the side wall of the shell 100, and can contact the edge of the cover plate 200 and the side wall of the shell 100, and the first tab 320, the shell 100 and the cover plate 200 can be welded as a whole. On the one hand, the first tab 320 and the cover plate 200 is directly welded without setting a collecting plate, so that the height of the battery cell main body 310 can be increased under the condition that the height of the shell 100 remains unchanged, thereby increasing the space utilization and improving the energy density of the cylindrical battery. On the other hand, the first pole ear 320, the shell 100 and the cover plate 200 can be connected into a whole in a single welding process, reducing at least two welding processes between the first pole ear 320 and the shell 100 and between the shell 100 and the cover plate 200 to one welding, reducing the welding process of assembling the cylindrical battery, and thus improving the production and assembly efficiency of the cylindrical battery.

[0045] For example, Figure 3 As shown, the edge of the cover plate 200 is provided with a folded edge 210, which is arranged perpendicular to the main portion of the cover plate 200 and extends away from the battery cell body 310. The cover plate 200 is also provided with an injection hole 220 for injecting electrolyte into the cylindrical battery. The injection hole 220 and the center hole 240 are arranged in a corresponding manner to facilitate the flow and infiltration of the electrolyte.

[0046] like Figure 4 As shown, one end of the first tab 320 away from the battery cell body 310 is folded until it contacts the outer peripheral wall of the shell 100 to form a folded portion 321 , wherein the folded portion 321 , the folded edge 210 and the shell 100 are integrally welded.

[0047] In this embodiment, the folding portion 321 is clamped between the folding edge 210 and the outer peripheral wall of the shell 100, so that the folding edge 210 and the outer peripheral wall of the shell 100 can limit and pre-fix the first pole tab 320, thereby improving the welding quality during welding. If the position of the first pole tab 320 is set inside the shell 100 for welding, since the first pole tab 320 is inside the shell 100, it is not visible during welding. Therefore, it is difficult to effectively limit the first pole tab 320, and it is impossible to predict whether the first pole tab 320 deviates from the preset position. Once the first pole tab 320 is deviated, the welding quality will be affected. In this embodiment, by setting the folding portion 321 relative to the outer peripheral wall of the shell 100 and the folding edge 210, the position of the folding portion 321 can be seen during welding, and then it can be determined whether the first pole tab 320 is deviated, which is conducive to improving the welding quality.

[0048] Furthermore, if the first pole tab 320 is designed to be located inside the housing 100, during welding, the welding energy must first penetrate the folded edge 210 and the housing 100 before welding to the first pole tab 320, resulting in a smaller welding window. If the welding power is too high, the first pole tab 320 may be broken down, thereby damaging the battery cell body 310. If the power is too low, the first pole tab 320 may not be effectively welded, or only a portion of the first pole tab 320 may be welded, resulting in a higher internal resistance of the battery cell 300. In this embodiment, the first pole tab 320 is designed to be located between the folded edge 210 and the outer peripheral wall of the housing 100. During welding, the welding energy penetrates the entire first pole tab 320 between the folded edge 210 and the housing 100 for welding, while forming a molten pool with the housing 100. However, it is difficult for the welding energy to pass through the side wall of the housing 100, thereby providing a wide welding window and a higher welding yield.

[0049] In some optional embodiments, the folded edge 210 is formed by bending the edge of the cover plate 200. That is, the folded edge 210 and the cover plate 200 are an integrated structure to provide higher strength and sealing. Of course, it is understood that the folded edge 210 can also be connected to the cover plate 200 by welding or other methods, which is not limited in this embodiment.

[0050] Exemplarily, the folded edge 210 may be an annular structure, that is, the circumferential edge of the cover plate 200 is provided with a folded edge 210 to ensure the sealing performance of the inner cavity formed by the shell 100 and the cover plate 200 after connection.

[0051] In some optional embodiments, the folded portion 321, the folded edge 210, and the outer peripheral wall of the housing 100 are integrally welded to form a welded portion, and the welded portion is partially located inside the folded edge 210, partially located inside the folded portion 321, and partially located inside the housing 100. In this embodiment, the welded portion can be formed during the welding process by melting the solder, a portion of the folded edge 210, a portion of the housing 100, and a portion of the folded portion 321, and then cooling and shaping them.

[0052] Exemplarily, the welding portion seals the gap between the folded portion 321 and the folded edge 210, as well as the gap between the folded portion 321 and the shell 100, to ensure the overall sealing of the cylindrical battery and improve the waterproof and dustproof performance of the cylindrical battery. It can be seen that the molten pool formed during the welding process of this embodiment can play a sealing role. In some optional embodiments, the welding portion also covers the end surface of the end of the folded portion 321 to prevent the folded portion 321 from being exposed, which is beneficial to improving the safety performance of the cylindrical battery. Of course, it is understandable that the welding may not cover the end surface of the end of the folded portion 321.

[0053] In this embodiment, Figure 5As shown, the welding position of the folded portion 321, the folded edge 210, and the shell 100 is the end of the folded edge 210, and the welding direction is obliquely upward from the end of the folded edge 210, and the angle between the welding direction and the second direction is a, where 30°≤a≤45°, so that the extension direction of the welded portion formed after welding is 30°-45° with the second direction Y. The second direction Y is perpendicular to the axial direction of the shell 100, that is, the second direction Y is the radial direction of the shell 100. If the angle a between the welding direction and the second direction is too large, there is a risk that the folded portion 321 and the shell 100 cannot be effectively welded; if the angle a between the welding direction and the second direction is too small, the sealing performance of the formed welded portion for the cylindrical battery will be affected. For example, the angle a between the welding direction and the second direction is 30°, 35°, 40°, 43°, and 45°.

[0054] It should be noted that this embodiment uses a conventional welding method, namely laser penetration welding. However, for the structure in this embodiment, if penetration welding is performed from the side of the folded edge 210 (i.e., the surface of the folded edge 210 facing away from the folded portion 321) at an angle perpendicular to the folded edge 210, although the shell 100, the folded portion 321, and the folded edge 210 can be welded integrally, the sealing of the cylindrical battery and the prevention of exposure of the first tab 320 cannot be guaranteed. Based on this, this embodiment optimizes the welding position and welding angle (i.e., welding direction) during welding. From the end face of the folded edge 210, at a welding angle a, the folded edge 210 of the cover plate 200, the folded portion 321 of the first tab 320, and the shell 100 are connected by penetration welding. At the same time, the folded edge 210 and the shell 100 can form a molten pool to meet the purpose of sealing the cylindrical battery and preventing exposure of the first tab.

[0055] For example, Figure 1 As shown, the length of the folded edge 210 in the first direction X is 3mm-7mm. The first direction X is the axial direction of the housing 100, that is, the thickness direction of the cover plate 200. When the length of the folded edge 210 in the first direction X is too long, it will result in the folded portion 321 being unable to be welded during the welding process if the length of the folded portion 321 in the first direction X is small, resulting in a blank weld. If the length of the folded portion 321 in the first direction X is large, the length of the first tab 320 will be increased, increasing the cost and causing the battery cell 300 to have a larger internal resistance. When the length of the folded edge 210 in the first direction X is too small, the contact area between the folded edge 210 and the folded portion 321 is small, which will affect the welding effect and yield, and cause the folded edge 210 and the folded portion 321 to separate more easily. For example, the length of the folded edge 210 in the first direction X is 3mm, 4mm, 5mm, 6mm or 7mm.

[0056] Exemplarily, the thickness of the folded edge 210 is 0.5mm-0.8mm to ensure that there is a sufficient molten pool to act as a seal during welding. It should be noted that the thickness direction of the folded edge 210 is perpendicular to the first direction X. If the folded edge 210 is too thick, the lateral dimension of the cylindrical battery will be increased, making the overall size of the cylindrical battery larger, which is not conducive to improving the energy density of the cylindrical battery; if the folded edge 210 is too thin, a sufficient molten pool cannot be formed during welding, which will affect the sealing after welding. For example, the thickness of the folded edge 210 is 0.5mm, 0.6mm, 0.7mm, and 0.8mm.

[0057] Optionally, the orthographic projection of the folded portion 321 in the second direction Y is located within the folded edge 210, wherein the second direction Y is perpendicular to the axial direction of the housing 100. By setting the orthographic projection of the folded portion 321 in the second direction Y to be within the folded edge 210, the folded portion 321 does not protrude from the folded edge 210 in the first direction X. On the one hand, this avoids safety risks caused by the exposure of the first tab 320. On the other hand, the folded portion 321 does not affect the formation of the molten pool during welding, thereby ensuring sealing during welding.

[0058] In some optional embodiments, such as Figure 4 As shown, the minimum distance d between the edge of the folded edge 210 facing away from the cover plate 200 and the edge of the folded portion 321 is 0-1mm. Based on the welding position and welding direction of this solution, if the minimum distance d between the edge of the folded edge 210 facing away from the cover plate 200 and the edge of the folded portion 321 is designed to be greater than 1mm, since the first pole tab 320 is far away from the welding position, it is easy to cause insufficient welding of the first pole tab 320, thereby causing the welding position to be detached, reducing the current capacity of the battery cell 300 and causing the internal resistance of the battery cell 300 to be high. When the minimum distance d between the edge of the folded edge 210 facing away from the cover plate 200 and the edge of the folded portion 321 is less than 0mm, that is, the first pole tab 320 extends out of the folded edge 210, the first pole tab 320 will be exposed, causing safety risks. At the same time, it is easy to affect the formation of the molten pool between the folded edge 210 and the shell 100 during welding, thereby affecting the sealing of the welding. Therefore, the minimum distance d between the edge of the folded edge 210 facing away from the cover plate 200 and the edge of the folded portion 321 is designed to be 0-1 mm. For example, the minimum distance d between the edge of the folded edge 210 facing away from the cover plate 200 and the edge of the folded portion 321 is 0, 0.2 mm, 0.6 mm, 0.8 mm, and 1 mm.

[0059] In some optional embodiments, the first tab 320 includes multiple layers of tabs sequentially arranged along a preset direction, and each layer of tabs has a fold-over portion 321, that is, each tab can be folded over onto the outer peripheral wall of the housing 100. The preset direction is perpendicular to the axial direction of the battery cell body 310. When the battery cell body 310 and the housing 100 are coaxially arranged, the preset direction is the second direction Y. It should be noted that the multiple tabs in each layer are spaced apart along the circumference of the battery cell body 310, and a slit is formed between adjacent tabs.

[0060] In this embodiment, the heights of the pole tabs in the same layer are the same, and in the direction from the center of the battery cell body 310 to the edge, the heights of the pole tabs in different layers gradually decrease to ensure that each pole tab can extend to the outside of the shell 100 to be folded, and will not protrude the folded edge 210 in the first direction X and be exposed.

[0061] Optionally, the height difference between two adjacent layers of tabs in the preset direction is 0.3mm-0.4mm. If the height difference between two adjacent layers of tabs in the preset direction is too large, the ends of the multiple tabs will be severely uneven, thereby affecting the formation of the molten pool and the welding effect. If the height difference between two adjacent layers of tabs in the preset direction is too small, the ends of the multiple tabs will also be uneven. For example, the height difference between two adjacent layers of tabs in the preset direction is 0.3mm, 0.35mm, and 0.4mm.

[0062] By being arranged in the direction from the center of the battery cell body 310 to the edge, the height of the pole ear gradually decreases, and the height difference of the pole ears of two adjacent layers in the preset direction is controlled within a certain range, so that the end faces of the folded portions 321 of multiple pole ears facing away from the cover plate 200 can be relatively flat, that is, the distance between the end edge of each folded portion 321 and the edge of the folded edge 210 facing away from the cover plate 200 is close, so that during welding, the folded portion 321 of each pole ear can be welded, thereby reducing the probability of welding leaks and further improving the welding quality.

[0063] Further optionally, when the first electrode tab 320 includes multiple electrode tabs, the end surfaces of the folded portions 321 of the multiple electrode tabs facing away from the cover plate 200 are flush, further reducing the probability of welding leaks and further improving welding quality.

[0064] Of course, it is understandable that not all tabs may have the folded portion 321 , that is, some tabs may not have the folded portion 321 , and this embodiment does not limit this.

[0065] Exemplarily, the height of the innermost tab of the multi-layer tab closest to the center of the battery cell body 310 is 18 mm to 22 mm, that is, the height of the tab of the layer closest to the center of the battery cell body 310 is 18 mm to 22 mm, that is, the height of the tabs located in the inner circle are all 18 mm to 22 mm, so as to have sufficient height to extend to the outside of the housing 100. For example, the height of the innermost tab of the multi-layer tab closest to the center of the battery cell body 310 is 18 mm, 19 mm, 20 mm, 21 mm, and 22 mm.

[0066] For example, the height of the outer tabs that are the longest distance from the center of the battery cell body 310 in the preset direction is 2 mm to 6 mm. That is, the height of the tabs located in the outer circle is 2 mm to 6 mm, so that the length of the tabs extending to the outside of the housing 100 is not too long or too short. For example, the height of the outer tabs that are the longest distance from the center of the battery cell body 310 in the preset direction is 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0067] In some optional embodiments, such as Figure 5 and Figure 6 As shown, the cylindrical battery further includes a protective pad 400. The protective pad 400 is disposed between a predetermined end face of the housing 100 and the first tab 320 to protect the first tab 320. The predetermined end face is the end face of the housing 100 at the end where the opening 110 is provided. Because the first tab 320 is folded away from the center of the battery cell body 310, the cover plate 200 presses down on the first tab 320 during assembly. The first tab 320 is typically made of metal foil and is relatively weak. Therefore, the provision of the protective pad 400 prevents the first tab 320 from being cut by the edges of the end of the housing 100, thereby reducing the risk of the end of the housing 100 damaging the first tab 320.

[0068] For example, Figure 6 As shown, the protection pad 400 is annular in shape to fully protect the first electrode tab 320. The protection pad 400 can be made of PP, rubber, silicone, etc., and has good electrolyte corrosion resistance.

[0069] Optionally, the thickness of the protective pad 400 (i.e., the length in the first direction X) is designed to be 0.15mm-0.25mm. For example, the thickness of the protective pad 400 is 0.15mm, 0.2mm, or 0.25mm. The width of the protective pad 400 is 1mm, and the outer diameter of the protective pad 400 is the same as the outer diameter of the housing 100 so as not to extend beyond the outer peripheral wall of the housing 100. The protective pad 400 can have a certain strength and can provide elastic support for the first tab 320, thereby improving the reliability of the cylindrical battery during manufacturing and use.

[0070] Optionally, the preset end face of the shell 100 is an arc surface, and the first pole tab 320 contacts the preset end face. The arc-shaped preset end face can reduce the risk of cutting the first pole tab 320, thereby improving the reliability of the cylindrical battery during manufacturing and use.

[0071] Optionally, in order to further improve the reliability of the cylindrical battery, the preset end surface of the shell 100 can be a curved surface and can also be provided with a protection pad 400, which is not limited in this embodiment.

[0072] For example, Figure 1 As shown, the battery cell 300 further includes at least one second tab 330 . The polarity of the second tab 330 is opposite to that of the first tab 320 . The battery cell body 310 includes a first end 311 and a second end 312 disposed opposite to the first end 311 .

[0073] In some optional embodiments, the first electrode tab 320 is extended from the end surface of the first end 311, and the second electrode tab 330 is extended from the end surface of the second end 312 and bent toward the center of the battery cell body 310. The first electrode tab 320 is a negative electrode tab, and the second electrode tab 330 is a positive electrode tab. The second electrode tab 330 can be electrically connected to the positive current collecting plate 350.

[0074] In some other optional embodiments, the first pole tab 320 and the second pole tab 330 are both led out from the end face of the first end 311 or the end face of the second end 312, and the first pole tab 320 and the second pole tab 330 are staggered in the circumferential direction of the battery cell body 310 to prevent short circuit. Those skilled in the art are capable of adjusting the electrical connection relationship of the cylindrical battery according to actual conditions, which will not be elaborated here.

[0075] This embodiment also provides an electrical device including the above-mentioned cylindrical battery, and the electrical device can have higher assembly efficiency.

[0076] Optionally, electrical devices include but are not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0077] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Cylindrical battery, characterized in that, include: A housing (100), wherein the housing (100) has an opening (110); a cover plate (200), the cover plate (200) covering the opening (110); A battery cell (300) is disposed in the shell (100) and comprises a battery cell body (310) and at least one first pole lug (320), wherein the at least one first pole lug (320) is led out from an end face of one end of the battery cell body (310) and bent in a direction away from the center of the battery cell body (310), and the first pole lug (320), the shell (100) and the cover plate (200) are welded together as a whole.

2. The cylindrical battery according to claim 1, characterized in that: The edge of the cover plate (200) is provided with a folded edge (210), and one end of the first pole tab (320) facing away from the battery cell body (310) is folded until it contacts the outer peripheral wall surface of the shell (100) to form a folded portion (321), and the folded portion (321), the folded edge (210) and the shell (100) are welded as a whole.

3. The cylindrical battery according to claim 2, characterized in that: The folding portion (321), the folding edge (210) and the outer peripheral wall of the shell (100) are welded together to form a welding portion. The welding portion is partially located inside the folding edge (210), partially located inside the folding portion (321), and partially located inside the shell (100). The welding portion seals the gap between the folding portion (321) and the folding edge (210), and seals the gap between the folding portion (321) and the shell (100). The extension direction of the welding portion is 30°-45° with the second direction (Y), wherein the second direction (Y) is perpendicular to the axial direction of the shell (100).

4. The cylindrical battery according to claim 2, characterized in that: The length of the folded edge (210) in the first direction (X) is 3 mm to 7 mm; and / or the thickness of the folded edge (210) is 0.5 mm to 0.8 mm, and the first direction (X) is the axial direction of the shell (100).

5. The cylindrical battery according to claim 2, characterized in that: The orthographic projection of the folding portion (321) in the second direction (Y) is located within the folding edge (210), and the minimum distance between the edge of the folding edge (210) facing away from the cover plate (200) and the edge of the folding portion (321) is 0-1 mm, and the second direction (Y) is perpendicular to the axial direction of the shell (100).

6. The cylindrical battery according to claim 2, characterized in that: The first pole tab (320) comprises multiple layers of pole tabs sequentially arranged along a preset direction, and each layer of pole tabs has the folded portion (321); wherein the preset direction is perpendicular to the axial direction of the battery cell body (310); The heights of the tabs in the same layer are the same, and the heights of the tabs gradually decrease in the direction from the center of the battery cell body (310) to the edge.

7. The cylindrical battery according to claim 6, characterized in that: The height difference between the two adjacent layers of tabs in the preset direction is 0.3mm-0.4mm; and / or, The height of the inner layer of the multiple layers of the tabs, which is closest to the center of the battery cell body (310), is 18 mm to 22 mm; and / or, The height of the outer tab that is the longest distance from the center of the battery cell body (310) in the preset direction is 2 mm to 6 mm.

8. The cylindrical battery according to claim 2, characterized in that: The first pole tab (320) comprises a plurality of pole tabs, and the end surfaces of the folded portions (321) of the plurality of pole tabs facing away from one end of the cover plate (200) are flush.

9. The cylindrical battery according to any one of claims 1 to 8, characterized in that: The cylindrical battery further comprises a protective pad (400), the protective pad (400) being arranged between a preset end face of the shell (100) and the first tab (320); and / or the preset end face of the shell (100) is a curved surface, and the first tab (320) is in contact with the preset end face; The preset end face is the end face of the housing (100) at one end where the opening (110) is provided.

10. An electrical device, characterized in that: A cylindrical battery comprising the cylindrical battery according to any one of claims 1 to 9.

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