Cylindrical battery and electric equipment

Abstract

The utility model discloses a cylindrical battery and electric equipment. The cylindrical battery comprises a shell, a battery cover and a battery cover, a battery cell; the current collecting plate comprises a body and a second convex part, the second convex part is arranged on one side, close to the accommodating space, of the body, and the second convex part is connected with the other one of the positive pole lug and the negative pole lug; and a cap. According to the cylindrical battery disclosed by the utility model, the full-tab roll core and the shell can be directly welded without a collector plate; a second lug boss is arranged on the collector plate welded with the full-tab roll core, so that the combination process between the collector plate and the full-tab roll core is optimized, and the welding effect is improved; the number of integral parts of the cylindrical battery is reduced, the assembling process steps are reduced, the process efficiency is optimized, and the material cost is reduced; the number of parts is reduced, the number of interfaces on a heat conduction path is reduced, and the heat dissipation performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a cylindrical battery and electrical equipment. Background Art

[0002] With the continuous development of the new energy industry, consumers are increasingly demanding higher discharge power and fast charging performance from batteries. However, the small flow area and high heat generation caused by the single / multi-tab design of traditional cylindrical battery cells have become a hindrance to the high-power application of cylindrical cells.

[0003] To address this issue, the industry has introduced full-tab technologies such as cut-tab and rolled-tab technologies, but this has also led to changes in the structural design of traditional cylindrical cells. Currently, most full-tab cylindrical cell designs forgo the cap that provides both CID and explosion-proof functions, significantly limiting their application in the 3C industry.

[0004] Existing full-tab cylindrical cells, which retain a cap with CID and explosion-proof features, typically have the following design: positive and negative current collectors are welded to the positive and negative electrodes of the winding core. The positive collector is connected to the cap via a connecting handle, while the negative collector is spot-welded to the bottom of the casing. This demonstrates the complex structural design and manufacturing process of existing full-tab cylindrical cells, resulting in a high number of welds, low production efficiency, and high costs. Utility Model Content

[0005] One purpose of the present invention is to provide a cylindrical battery that can at least solve the technical problem of complex structural design process in the prior art.

[0006] Another object of the present invention is to provide an electrical device comprising the cylindrical battery.

[0007] In order to achieve the above objectives, the present utility model provides the following technical solutions.

[0008] According to the cylindrical battery of the embodiment of the first aspect of the present invention, it includes: a shell, which is cylindrical in shape, and a receiving space is defined in the shell. Along the axial direction of the shell, one end of the shell has an opening connected to the receiving space, and the inner wall of the other end of the shell has a first protrusion; a battery core, which is located in the receiving space and extends along the axial direction of the shell, and the battery core is a full-pole tab winding core, and the full-pole tab winding core includes a positive pole tab and a negative pole tab, and one of the positive pole tab and the negative pole tab is connected to the first protrusion by welding; a current collecting plate, which is located in the receiving space, and the current collecting plate includes a main body and a second protrusion, and the second protrusion is provided on a side of the main body close to the receiving space, and the second protrusion is connected to the other of the positive pole tab and the negative pole tab by welding; a cap, which is provided at the opening.

[0009] Optionally, one end of the first protrusion extends toward the central axis of the shell, and the other end of the first protrusion extends toward the outer edge of the shell along the radial direction of the shell; and / or, one end of the second protrusion extends toward the center position of the body, and the other end of the second protrusion extends toward the outer edge of the body and does not extend out of the outer edge of the body.

[0010] Optionally, the collecting plate further comprises: a connecting handle, the connecting handle being provided on the main body, the connecting handle and the orthographic projection of the second protrusion on the main body being staggered, and the connecting handle being connected to the cap.

[0011] Optionally, the connecting handle is connected to the cap after being bent, and the thickness of the connecting handle in the bending area is thinner, or the width is narrower, or it is pre-bent; and / or the number of the second protrusions is not less than three, and the multiple second protrusions are symmetrical relative to the connecting handle.

[0012] Optionally, there are multiple first protrusions, which are spaced apart and arranged around a central area of ​​the other end of the shell, and the central area of ​​the other end of the shell has a plane.

[0013] Optionally, the main body has a first through hole at the center position, and one end of the second protrusion extends toward the axial direction of the first through hole; and / or, the main body is provided with a second through hole, and the second through hole is located between two adjacent second protrusions; and / or, the outer edge of the main body has a notch.

[0014] Optionally, the other end of the shell is stamped to form the first protrusion, and the outer side of the other end of the shell has a first groove corresponding to the first protrusion; and / or, the body is stamped to form the second protrusion on one side, and the other side of the body has a second groove corresponding to the second protrusion.

[0015] Optionally, the outer contour of the cross section of the second protrusion is a trapezoid or a rectangle. When the outer contour is a trapezoid, the short side of the trapezoid is close to the axial direction of the full-tab winding core. When the outer contour is a rectangle, the two ends of the rectangle are straight sides or semicircular sides.

[0016] The electrical equipment according to the embodiment of the second aspect of the present invention includes any of the cylindrical batteries described above, or a cylindrical battery prepared by any of the methods for preparing cylindrical batteries described above.

[0017] According to the cylindrical battery of the embodiment of the present invention, on the one hand, the full-tab core and the shell can be directly welded without a current collecting plate; on the other hand, the current collecting plate welded to the full-tab core is provided with a second protrusion, which optimizes the joining process between the current collecting plate and the full-tab core and improves the welding effect; on the other hand, through the combination of the above two aspects, the number of overall parts of the cylindrical battery is reduced, the assembly process steps are reduced, the process efficiency is optimized, and the material cost is reduced. It can be seen that the cylindrical battery of the embodiment of the present invention, while maintaining the cap with CID and explosion-proof functions of the cylindrical battery, optimizes the structural design and assembly process, reduces the process steps, improves production efficiency, and reduces material and process costs; in addition, it also reduces the number of parts, reduces the number of interfaces on the heat conduction path, and improves the heat dissipation performance of the battery cell.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0020] Figure 1 This is a front view of a cylindrical battery according to one embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the three-dimensional structure of a cylindrical battery according to one embodiment of the present invention;

[0022] Figure 3 A partial exploded view of a cylindrical battery according to one embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a cylindrical battery according to one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the assembly of a cylindrical battery according to one embodiment of the present invention;

[0025] Figure 6 This is a structural schematic diagram of a current collecting plate with three second protrusions according to an embodiment of the present utility model;

[0026] Figure 7 This is a structural schematic diagram of a current collecting plate with four second protrusions according to an embodiment of the present utility model;

[0027] Figure 8 This is a structural schematic diagram of a current collecting plate with five second protrusions according to an embodiment of the present utility model;

[0028] Figure 9 Schematic diagram of a current collecting plate with a notch according to one embodiment of the present utility model;

[0029] Figure 10 Schematic diagram of a current collecting plate with a second through hole according to one embodiment of the present utility model;

[0030] Figure 11 Schematic diagram of a current collecting plate having a plurality of second through holes and a plurality of notches according to an embodiment of the present utility model;

[0031] Figure 12 This is a schematic diagram of a housing having a first protrusion according to an embodiment of the present utility model;

[0032] Figure 13 This is a schematic diagram of a housing having two first protrusions according to an embodiment of the present utility model;

[0033] Figure 14 This is a schematic diagram of a housing having three first protrusions according to an embodiment of the present utility model;

[0034] Figure 15 is a schematic diagram of a housing having three first protrusions according to another embodiment of the present utility model;

[0035] Figure 16 This is a schematic diagram of a housing having four first protrusions according to an embodiment of the present utility model;

[0036] Figure 17 is a schematic diagram of a housing having four first protrusions according to another embodiment of the present utility model;

[0037] Figure 18 This is a schematic diagram of a housing having five first protrusions according to an embodiment of the present utility model;

[0038] Figure 19 It is a schematic diagram of a shell having four first protrusions according to an embodiment of the present utility model.

[0039] Figure Numbers

[0040] Cylindrical battery 100;

[0041] Housing 10; receiving space 11; opening 12; first protrusion 13; first groove 14;

[0042] Battery cell 20;

[0043] Collecting plate 30; body 31; second protrusion 32; connecting handle 33; first through hole 34; second through hole 35; notch 36; second groove 37;

[0044] Cap 40;

[0045] Insulation layer 50. DETAILED DESCRIPTION

[0046] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0047] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0050] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] The cylindrical battery 100 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0052] like Figures 1 to 19As shown, a cylindrical battery 100 according to an embodiment of the present invention includes: a housing 10 , a battery cell 20 , a current collecting plate 30 and a cap 40 .

[0053] Specifically, the housing 10 is cylindrical in shape and defines a receiving space 11 therein. An opening 12 is formed at one end of the housing 10 in communication with the receiving space 11 along its axial direction, and a first protrusion 13 is formed on the inner wall of the other end of the housing 10. A battery cell 20 is located in the receiving space 11 and extends axially along the housing 10. The battery cell 20 is a full-tab winding core, comprising a positive tab and a negative tab, one of which is welded to the first protrusion 13. A current collecting tray 30 is located in the receiving space 11 and comprises a main body 31 and a second protrusion 32. The second protrusion 32 is disposed on a side of the main body 31 proximal to the receiving space 11 and is welded to the other of the positive tab and the negative tab. A cap 40 is disposed in the opening 12. In other words, the full-tab winding core can be directly welded to the second protrusion 32.

[0054] In other words, the cylindrical battery 100 according to an embodiment of the present invention is primarily composed of a housing 10, a battery cell 20, a current collecting plate 30, and a cap 40. The housing 10 is cylindrical in shape, defining a receiving space 11 therein. Along the axial direction of the housing 10, one end of the housing 10 has an opening 12 that communicates with the receiving space 11. In other words, the housing 10 is a straight cylindrical structure, with an opening 12 at the top or bottom of the housing 10. The inner wall of the housing 10 is provided with a protruding first protrusion 13. For example, the bottom of the housing 10 is sealed without an opening, and a ridge extending radially along the inner side of the bottom is provided as the first protrusion 13. That is, the first protrusion 13 protrudes from the inner side of the bottom toward the interior of the housing 10. The number of first protrusions 13 can be one or more, and is not limited herein. For example, the number of first protrusions 13 can be one, two, three, four, five, or six. Optionally, when there are multiple first protrusions 13, the outer edges of some or all of the first protrusions 13 in the longitudinal direction can extend to the outer edge of the bottom surface of the shell 10, or be flush with the outer edge of the bottom surface of the shell 10, thereby expanding the connection area between the first protrusion 13 and the battery cell 20.

[0055] A battery cell 20 is mounted within the housing space 11. This cell 20 is a full-tab core that extends axially along the housing 10. For example, the central axis of the housing 10 is vertical, meaning that the housing 10 is a cylindrical member extending vertically. The height of the full-tab core within the housing 10 is also vertical. The full-tab core includes both positive and negative tabs. For example, the upper end of the full-tab core includes the positive tab, while the lower end includes the negative tab; or the upper end of the full-tab core includes the negative tab, while the lower end includes the positive tab. Furthermore, one of the positive and negative tabs is welded to the first protrusion 13. In other words, in this embodiment, either the positive or negative tab can be welded to the first protrusion 13. In other words, in this embodiment, the housing 10 is optimized to allow direct welding between the full-tab core and the housing 10, eliminating the need for a current collecting plate 30 and reducing assembly steps.

[0056] In addition, a current collecting tray 30 is installed in the receiving space 11. The current collecting tray 30 mainly consists of a main body 31 and a second protrusion 32. The second protrusion 32 is located on the side of the main body 31 close to the receiving space 11. The second protrusion 32 is welded to the other of the positive and negative electrode tabs. The cap 40 is located in the opening 12. For example, the positive electrode tab of a full-tab winding core is welded to the first protrusion 13 in the housing 10, and the negative electrode tab of a full-tab winding core is welded to the second protrusion 32 on the current collecting tray 30. The cylindrical battery 100 of this embodiment can be processed in a variety of sequences. For example, the lower end of the full-tab core can be welded to the first protrusion 13 in the shell 10, and then the upper end of the full-tab core can be welded to the second protrusion 32 on the current collecting plate 30. Alternatively, the upper end of the full-tab core can be welded to the second protrusion 32 of the current collecting plate 30, and then the full-tab core and the current collecting plate 30 are combined into a small integral body before being inserted into the shell, thereby improving assembly efficiency. In this embodiment, by adopting a design in which the second protrusion 32 protrudes from the body 31, the protrusion is pressed into the core tab during welding, ensuring close contact between the parts to be welded, reducing the risk of cold welding and improving the welding yield. It can be seen that the welding method of the current collecting plate 30 and the full-tab core can be optimized, thereby improving the welding yield.

[0057] Compared with the prior art, the cylindrical battery 100 of the embodiment of the present invention does not require two current collecting plates 30, but only requires one current collecting plate 30, that is, the assembly between the full-tab winding core, the shell 10 and the current collecting plate 30 can be realized, that is, the full-tab winding core and the shell 10 can be directly welded without the current collecting plate 30.

[0058] Therefore, according to the cylindrical battery 100 of the embodiment of the present invention, on the one hand, the full-tab core and the shell 10 can be directly welded without the need for a current collecting plate 30; on the other hand, the current collecting plate 30 welded to the full-tab core is provided with a second protrusion 32, which optimizes the joining process between the current collecting plate 30 and the full-tab core and improves the welding effect; on the other hand, through the combination of the above two aspects, the number of overall parts of the cylindrical battery 100 is reduced, the assembly process steps are reduced, the process efficiency is optimized, and the material cost is reduced. It can be seen that the cylindrical battery 100 of the embodiment of the present invention, while maintaining the cap 40 with CID and explosion-proof functions of the cylindrical battery 100, optimizes the structural design and assembly process, reduces the process steps, improves production efficiency, and reduces material and process costs; in addition, it also reduces the number of parts, reduces the number of interfaces on the heat conduction path, and improves the heat dissipation performance of the battery cell.

[0059] According to one embodiment of the present invention, one end of the first protrusion 13 extends toward the central axis of the shell 10, and the other end of the first protrusion 13 extends radially toward the outer edge of the shell 10. For example, the first protrusion 13 is provided on the bottom surface of the shell 10, and the extension direction of the first protrusion 13 is the radial direction of the bottom surface. In this embodiment, since the full-tab winding core is formed by winding the pole pieces, it can be approximately regarded as a multi-layer concentric circle structure. Therefore, one end of the first protrusion 13 faces the center of the bottom surface of the shell 10, and the other end of the first protrusion 13 faces the outer edge of the shell 10. The first protrusion 13 extends radially along the bottom surface of the shell 10, which can cover most of the layers of the full-tab winding core with the shortest path, and achieve as many connection points as possible with the smallest welding path, effectively improving the welding efficiency and reducing the internal resistance of the battery cell.

[0060] According to one embodiment of the present invention, Figures 6 to 11 As shown, one end of the second protrusion 32 extends toward the center of the body 31, while the other end of the second protrusion 32 extends toward the outer edge of the body 31 without extending beyond the outer edge of the body 31. That is, it is spaced apart from or flush with the outer edge of the body 31. For example, if the body 31 is a circular disc, the second protrusion 32 extends radially along the disc, with the inner end of the second protrusion 32 facing the center of the disc and the outer end of the second protrusion 32 facing the outer edge of the disc without extending beyond the outer edge of the disc. In this embodiment, the radial extension of the second protrusion 32 can cover the maximum number of core layers with the shortest distance, which is not described in detail here.

[0061] In some specific embodiments of the present invention, Figures 4 to 11As shown, the collecting tray 30 also includes: a connecting handle 33, which is provided on the main body 31. The connecting handle 33 and the second protrusion 32 are staggered in their orthographic projections on the main body 31, and the connecting handle 33 is connected to the cap 40. That is, in this embodiment, the collecting tray 30 may include the main body 31, the second protrusion 32 and the connecting handle 33. For example, the main body 31 is a circular piece, and the connecting handle 33 is extended from one side edge of the circular piece, and one end of the connecting handle 33 is oriented toward the center position of the circular piece. In the area where the connecting handle 33 is not provided on the collecting tray 30, the second protrusion 32 is provided on the collecting tray 30. It should be noted that in the embodiment of the utility model, the main body 31 of the circular piece can be a perfect circle, an ellipse, a quasi-circular shape, etc., which is not limited here.

[0062] Among them, the orthographic projections of the connecting handle 33 and the second protrusion 32 on the main body 31 are staggered. For example, the collecting plate 30 extends in the horizontal direction. Under the projection of the vertically downward light, the orthographic projection of the connecting handle 33 and the orthographic projection of the second protrusion 32 do not overlap. That is, in this embodiment, the connecting handle 33 and the second protrusion 32 do not overlap, which can avoid mutual interference between the two and help reduce the difficulty of manufacturing the two.

[0063] Furthermore, the connecting handle 33 can be connected to the cap 40, that is, one end of the connecting handle 33 can be connected to the body 31, and the other end can be connected to the cap 40; or one end of the connecting handle 33 can be connected to the body 31, and after the connecting handle 33 is bent, the bent upper side of the connecting handle 33 is connected to the cap 40. In this embodiment, the use of the connecting handle 33 helps to improve the tightness of the connection between the cap 40 and the collecting plate 30, etc., and simplifies the structure of the cap 40, etc.

[0064] According to one embodiment of the present invention, Figure 4 and Figure 5 As shown, the connecting handle 33 is connected to the cap 40 after being bent. The connecting handle 33 is thinner or narrower in the bent area, or is pre-bent. In other words, the area corresponding to the bend can be weakened on the connecting handle 33 to achieve the purpose of controlling the bending position of the connecting handle 33 during assembly.

[0065] In some specific embodiments of the present invention, the number of the second protrusions 32 is not less than three, for example, the number of the second protrusions 32 is three, four, five, etc., and the plurality of second protrusions 32 are symmetrical with respect to the connecting handle 33. For example, the number of the second protrusions 32 is three, each second protrusion 32 is a convex strip extending radially along the body 31, the lower end of the connecting handle 33 before being bent is connected to the upper edge of the body 31, the left end of the first second protrusion 32 extends toward the upper left, and the right end extends toward the center of the body 31; the left end of the second second protrusion 32 extends toward the center of the body 31, and the right end extends toward the upper right; the upper end of the third second protrusion 32 extends toward the center of the body 31, and the lower end extends downward. In this embodiment, by adopting a number of second protrusions 32 of not less than three and the multiple second protrusions 32 being symmetrical relative to the connecting handle 33, the collecting plate 30 itself can be designed as an axisymmetric, which can reduce the risk of uneven force on the welding parts on both sides of the collecting plate 30 when bending the connecting handle 33 after the welding of the collecting plate 30 and the full-pole ear core is completed, and the risk of deflection of the collecting plate 30 or partial detachment of the weld can be reduced.

[0066] According to one embodiment of the present invention, there are multiple first protrusions 13, and the multiple first protrusions 13 are spaced apart and arranged around the central area of ​​the other end of the shell 10, and the central area of ​​the other end of the shell 10 has a plane. For example, the other end of the shell 10 is the lower end of the shell 10, and the lower end of the shell 10 includes a circular flat plate structure extending in the horizontal direction, and the center of the circular flat plate structure is the center position of the circle. It can be understood that when the lower end of the shell 10 includes structures of other shapes, the center of the lower end of the shell 10 is the geometric center position. For the convenience of explanation, as shown in FIG. Figure 4 As shown, the central area of ​​the other end of the housing 10 is defined as area A, and multiple first protrusions 13 are spaced apart and distributed, and the multiple first protrusions 13 form an annular structure. The annular structure is arranged around area A, that is, area A is located in the hollow interior of the annular structure. It should be noted that by setting the central area to have a plane, that is, area A has not undergone additional processing, the surface of area A is flat, and there is no metal foreign matter. Therefore, it is compatible with connecting existing equipment at the bottom center of the housing 10. For example, existing test equipment and module welding equipment usually set the test probe (needle point) or busbar welding position to the center of the bottom of the battery cell.

[0067] In some specific embodiments of the present invention, Figures 6 to 11As shown, the body 31 has a first through-hole 34 at its center, with one end of the second protrusion 32 extending toward the axis of the first through-hole 34; and / or, the body 31 has a second through-hole 35 located between two adjacent second protrusions 32; and / or, the outer edge of the body 31 has a notch 36. For example, the body 31 with the notch 36 may be shaped like a Y, a four-leaf clover, or a snowflake. For example, the body 31 may have a first through-hole 34 at its center and four second protrusions 32 disposed thereon. Each second protrusion 32 has its inner end facing the center of the body 31 and its outer end facing the outer edge of the body 31. A second through-hole 35 is disposed between every two second protrusions 32, and three notches 36 are disposed on the outer edge of the body 31. In this embodiment, the provision of at least one of the first through-hole 34, the second through-hole 35, and the notch 36 can reduce the weight of the collecting plate 30 and increase the gas-liquid passageway.

[0068] According to one embodiment of the present invention, Figure 4 、 Figures 12 to 19 As shown, the other end of the housing 10 is stamped to form a first protrusion 13, and the outer side of the other end of the housing 10 has a first groove 14 corresponding to the first protrusion 13; and / or, as shown Figure 3 and Figure 4 As shown, the body 31 is embossed to form a second protrusion 32 on one side, and the other side of the body 31 has a second groove 37 corresponding to the second protrusion 32 .

[0069] In some specific embodiments of the present invention, the cross-sectional outer contour of the second raised portion 32 is trapezoidal or rectangular. When the outer contour is trapezoidal, the short side of the trapezoid is close to the axial direction of the full tab winding core. When the outer contour is rectangular, the two ends of the rectangle are straight or semicircular. For example, four second raised portions 32 are formed on a body 31 by downward stamping. The body 31 is disc-shaped. The four second raised portions 32 are spaced and evenly and symmetrically distributed around the central axis of the disc. Each second raised portion 32 has a trapezoidal cross-sectional shape. The short side can be close to the central axis of the disc, and the long side can be away from the central axis of the disc. For another example, the cross-sectional shape of the second raised portion 32 is an elongated strip, with the two short sides being arc-shaped, and the centers of the arcs being close to the central axis of the elongated strip.

[0070] Optionally, the collecting tray 30 is made of aluminum or nickel-plated aluminum. Using such materials facilitates the provision of the second protrusion 32 on the collecting tray 30. Furthermore, when the collecting tray 30 includes a connecting handle 33, using such materials to manufacture the collecting tray 30 also facilitates the manufacture and bending of the connecting handle 33.

[0071] Optionally, the shell 10 is made of steel, nickel-plated steel or stainless steel. The shell 10 made of the above materials has a certain strength and is not easily deformed.

[0072] Alternatively, as Figure 3 and Figure 4 As shown, the cylindrical battery 100 further includes an insulating layer 50, which is located outside at least a portion of the battery cell 20 and the current collecting plate 30. Optionally, the insulating layer 50 is an insulating sleeve or insulating rubber coating. In this embodiment, the use of the insulating layer 50 can improve safety performance.

[0073] The present invention also provides a method for manufacturing a cylindrical battery 100. The cylindrical battery 100 is any of the cylindrical batteries 100 in the above embodiments. The manufacturing method includes the following steps:

[0074] Connect the second protrusion 32 on the current collecting plate 30 to one end of the battery cell 20 by laser welding;

[0075] Place the current collecting plate 30 and the battery cell 20 together in the housing 10;

[0076] The other end of the battery cell 20 is connected to the first protrusion 13 of the housing 10 by laser welding.

[0077] That is, in this embodiment, the present invention also provides a method for manufacturing a cylindrical battery 100, in which the current collecting tray 30 and the battery cell 20 can be first assembled into a small unit, and then the small unit can be installed inside the housing 10. More specifically, when assembling the small unit, the second protrusion 32 of the current collecting tray 30 can be connected to one end of the battery cell 20 through a laser welding process; when assembling the small unit into the housing 10, the other end of the battery cell 20 can be connected to the first protrusion 13 inside the housing 10 through a laser welding process.

[0078] For example, Figure 5 As shown, the assembly process includes the following steps:

[0079] S1. Place the second protrusion 32 on the current collecting plate 30 toward the full-tab winding core and press it into one end of the positive electrode of the full-tab winding core for assembly.

[0080] S2. The full tab winding core and the collecting plate 30 are welded by irradiating the second groove 37 corresponding to the second protrusion 32 with a laser. After the welding is completed, the connecting handle 33 is bent to 90 degrees to be perpendicular to the main body 31. During this process, the main body 31 and the full tab winding core can be kept concentric.

[0081] S3. Wrap the full-tab core and the current collecting disk 30 with an insulating layer 50, and then put them into the shell 10; apply pressure to the full-tab core from the side where the current collecting disk 30 is located, so that the first protrusion 13 of the bottom inner wall of the shell 10 is pressed into one end of the negative electrode of the full-tab core; and irradiate the first groove 14 corresponding to the first protrusion 13 at the bottom of the shell 10 with a laser to weld the full-tab core and the shell 10.

[0082] S4. Grooving of the shell 10.

[0083] S5. Inject electrolyte.

[0084] S6. Weld the connecting handle 33 and the cap 40. The cap 40 may be located on a side of the connecting handle 33 that is close to the central axis of the battery cell 20 after the connecting handle 33 is erected.

[0085] S7, bend the connecting handle 33, put the cap 40 into the housing 10, and press and seal it.

[0086] In summary, according to the cylindrical battery 100 and the manufacturing method thereof of the embodiment of the present invention, on the one hand, the shell 10 and the full-pole lug core are directly connected, which reduces the number of parts and process steps, improves production efficiency, and reduces production costs; on the other hand, by welding the first protrusion 13 and the full-pole lug core, and by welding the second protrusion 32 and the full-pole lug core, the welding effect can be improved, the internal resistance of the battery cell 20 can be reduced, and the performance of the battery cell 20 can be improved.

[0087] The present invention also provides an electrical device comprising the cylindrical battery 100 of any of the above embodiments, or a cylindrical battery 100 manufactured by the method for manufacturing the cylindrical battery 100 of any of the above embodiments. Since the cylindrical battery 100 of the present invention has advantages such as high welding yield and reduced parts and process steps, the electrical device of the present invention also has the same advantages, which will not be described in detail here.

[0088] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A cylindrical battery (100), characterized in that: include: A housing (10), the housing (10) being cylindrical in shape, defining a receiving space (11) therein, one end of the housing (10) having an opening (12) communicating with the receiving space (11) along the axial direction of the housing (10), and an inner wall of the other end of the housing (10) having a first protrusion (13); A battery core (20), the battery core (20) being located in the receiving space (11) and extending along the axial direction of the housing (10), the battery core (20) being a full-tab winding core, the full-tab winding core comprising a positive tab and a negative tab, one of the positive tab and the negative tab being connected to the first protrusion (13) by welding; A current collecting plate (30), the current collecting plate (30) is located in the receiving space (11), the current collecting plate (30) comprises a body (31) and a second protrusion (32), the second protrusion (32) is provided on a side of the body (31) close to the receiving space (11), and the second protrusion (32) is connected to the other of the positive electrode tab and the negative electrode tab by welding; A cap (40) is provided on the opening (12).

2. The cylindrical battery (100) according to claim 1, characterized in that One end of the first protrusion (13) extends toward the central axis of the housing (10), and the other end of the first protrusion (13) extends along the radial direction of the housing (10) toward the outer edge of the housing (10); and / or, One end of the second protrusion (32) extends toward the center of the body (31), and the other end of the second protrusion (32) extends toward the outer edge of the body (31) and does not extend beyond the outer edge of the body (31).

3. The cylindrical battery (100) according to claim 1, characterized in that The collecting plate (30) further comprises: A connecting handle (33) is provided on the body (31), the connecting handle (33) and the second protrusion (32) are staggered in their orthographic projections on the body (31), and the connecting handle (33) is connected to the cap (40).

4. The cylindrical battery (100) according to claim 3, characterized in that The connecting handle (33) is connected to the cap (40) after being bent, and the connecting handle (33) is thinner in the bent area, or narrower in width, or is pre-bent; and / or, The number of the second protrusions (32) is not less than three, and the plurality of second protrusions (32) are symmetrical relative to the connecting handle (33).

5. The cylindrical battery (100) according to claim 1, characterized in that There are multiple first protrusions (13), which are spaced apart and arranged around the central area of ​​the other end of the shell (10), and the central area of ​​the other end of the shell (10) has a plane.

6. The cylindrical battery (100) according to claim 1, characterized in that The body (31) has a first through hole (34) at its center, and one end of the second protrusion (32) extends toward the axial direction of the first through hole (34); and / or, the body (31) is provided with a second through hole (35), and the second through hole (35) is located between two adjacent second protrusions (32); and / or, the outer edge of the body (31) has a notch (36).

7. The cylindrical battery (100) according to claim 1, characterized in that The other end of the shell (10) is embossed to form the first protrusion (13), and the outer side of the other end of the shell (10) has a first groove (14) corresponding to the first protrusion (13); and / or, The body (31) is embossed to form the second convex portion (32) on one side, and the other side of the body (31) has a second groove (37) corresponding to the second convex portion (32).

8. The cylindrical battery (100) according to claim 7, characterized in that The outer contour of the cross section of the second protrusion (32) is a trapezoid or a rectangle. When the outer contour is a trapezoid, the short side of the trapezoid is close to the axial direction of the full-tab winding core. When the outer contour is a rectangle, both ends of the rectangle are straight sides or semicircular sides.

9. An electrical device, characterized in that: The cylindrical battery (100) comprises any one of claims 1 to 8.

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