Cylindrical batteries and electrical equipment

Abstract

To provide a low-height cylindrical battery capable of reducing an occupied space when being attached inside a battery module.SOLUTION: A cylindrical battery includes a housing 1 and a first collector member 2. The housing includes an opening and a housing chamber 11 for housing an electrode body 3. The first collector member includes a first body part 21 located inside the housing chamber and connected to the electrode body, and a second body part 22 connected to the housing. A beading site 12a is provided on a side wall of the housing. The beading site is recessed to the housing chamber to form a first recess on an external side wall of the housing, and also correspondingly form a first projection on an internal side wall of the housing. The second body part extends from an edge of the first body part to a side of the first projection, the side facing the opening. The first collector member is welded to the side wall of the housing, and a welding section is welded to a projecting surface of the beading site by a beading process.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to the field of battery technology, and in particular to cylindrical batteries and electrical devices. [Background technology]

[0002] In the prior art, the height of the battery housing is increased due to the need to prepare welding positions and beading areas in advance in cylindrical batteries, which requires a larger internal space for the battery module when the batteries are assembled into the battery module, resulting in a significant decrease in energy density. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem to be solved by the present invention is to provide a low-profile cylindrical battery that can reduce the space occupied when mounted in a battery module. [Means for solving the problem]

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] The cylindrical battery includes a housing and a first current collecting member. The housing has an opening and a chamber for accommodating an electrode assembly. The first current collecting member is located within the chamber and includes a first body portion and a second body portion. The first body portion is connected to the electrode assembly, and the second body portion is connected to the housing. A beading portion is provided on a side wall of the housing, and the beading portion is recessed into the chamber to form a first recess in the outer side wall of the housing and a corresponding first protrusion in the inner side wall of the housing. The second body portion extends from an edge of the first body portion to the side of the first protrusion facing the opening.

[0006] Preferably, the second body portion includes a welded section and a position limiting section, the position limiting section connecting the welded section to the first body portion, and the second body portion connecting to the first protrusion via the welded section. Specifically, before the beading portion is recessed into the receiving chamber, the second main body portion includes a welded section and a buffer section located between the welded section and the first main body portion. The beading portion is configured to correspond to the buffer section, and the buffer section can be recessed inward and curved along with the beading portion. When the beading portion is recessed into the receiving chamber to form the first protrusion on the inner side wall of the housing, the first protrusion presses the buffer section to cause the buffer section to bend inward and form the position limiting section. Because the first protrusion and the position limiting section are formed together through a beading process, an additional process for fitting the position limiting section is not required.

[0007] Preferably, the housing has an opening communicating with the receiving chamber, and the welding section is located on one side of the first protrusion and faces the opening, allowing laser welding to be performed directly at the welding section, thereby fixedly connecting the welding section and the first protrusion.

[0008] Preferably, the position limiting section and the first protrusion have the same cross-sectional shape. By matching the shape of the molded position limiting section and the shape of the first protrusion, the first current collecting member can be fixed more reliably.

[0009] Preferably, the position limiting section and the first protrusion both have a V-shaped cross section, which can provide an excellent position limiting and fixing effect.

[0010] Preferably, the position limiting section and the welding section abut against a surface of the first protrusion, whereby the position limiting section abuts against the first protrusion to ensure a position limiting and fixing effect, and the welding section abuts against the first protrusion to facilitate welding work and improve welding results.

[0011] Preferably, the buffer section has a cross-sectional shape that is bent (e.g., inverted Z-shaped) or arc-shaped, and the bent shape and arc-shaped cross-section are both longer than a straight line between two points, so that the intermediate portion of the buffer section can provide a sufficient deformation length.

[0012] Preferably, the first body portion and the second body portion are integrally molded, so that the first body portion and the position limiting section and the welded section formed after deformation have reliable structural strength.

[0013] Preferably, the second body portion has an extension direction perpendicular to the first body portion. By making the second body portion perpendicular to the first body portion, the first current collecting member with the added buffer section can be directly installed in the accommodating chamber.

[0014] Preferably, the cylindrical battery further includes a cover plate assembly for covering the opening, the cover plate assembly including a cover plate and a first insulating sealing member, the cover plate being fitted into the first insulating sealing member to insulate it from the housing.

[0015] The present invention further discloses an electrical device including the cylindrical battery described above. The electrical device may be a mobile phone, a wristwatch, a vehicle, an electric toy, an electric tool, or the like. The specific configuration of the specific product is similar to that of the prior art and will not be described further, but the main difference is that the cylindrical battery according to the present invention is used. [Effects of the Invention]

[0016] The cylindrical battery according to the present invention has the following technical advantages. Because the buffer section is provided corresponding to the beading portion of the housing, when the inner wall of the beading portion protrudes during the beading process of the cylindrical battery, the buffer section also bends and deforms accordingly. In this case, the buffer section undergoes tensile deformation. The welded section abuts against the protruding surface of the beading portion, and the welded section and the protruding surface of the beading portion are welded together. By providing a welding position corresponding to the beading portion, there is no need to prepare two positions on the battery housing, which reduces the height of the battery. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional schematic diagram of a side structure of a cylindrical battery according to the prior art. [Figure 2] 1 is a cross-sectional schematic view of the side structure of a cylindrical battery according to the present invention when a beading process has not been performed and a cover plate assembly has not been attached. [Figure 3] FIG. 2 is an enlarged schematic view of a partial structure of part A in FIG. [Figure 4] 1 is a cross-sectional schematic diagram of the side structure of a cylindrical battery according to the present invention after the beading process is completed but before the cover plate assembly is attached. [Figure 5] FIG. 4 is an enlarged schematic view of a partial structure of part B in FIG. [Figure 6] 2 is a cross-sectional schematic diagram of the side structure of a cylindrical battery according to the present invention after the beading process is completed and the cover plate assembly is attached. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below in conjunction with the following embodiments, which should not be construed as limiting the present invention.

[0019] 1, in a cylindrical battery according to the related art, a first polarity connection plate is welded to a first polarity tab, a second polarity connection plate is welded to a second polarity tab, the first polarity connection plate is welded to a first polarity terminal, the circumferential side wall of the second polarity connection plate 7 is welded to the inner wall of the housing 1, the beading portion 12 protrudes inward through the beading process to form a boss 17, a cover plate assembly 51 (not shown) covers the opening 14 and abuts against the boss 17, and the welding position 71 between the second polarity connection plate 7 and the housing side wall is located below the boss 17. The inventors discovered that because the welding position 71 and the beading portion 12 need to be prepared in advance, the height of the battery housing increases, resulting in a larger occupied space. In view of this, the present disclosure provides a cylindrical battery, which will be described in detail with reference to the following embodiments.

[0020] <Embodiment 1> As shown in Figures 2 to 5, the cylindrical battery includes a housing 1, an accommodating chamber 11 provided in the housing 1, and an opening 14 and a terminal through-hole 15 that communicate with the accommodating chamber 11. An electrode body 3, and a first current collecting member 2 and a second current collecting member 4 that are connected to both ends of the electrode body 3 are attached within the accommodating chamber 11. The first current collecting member 2 is a negative electrode connecting member and is provided so as to face the opening 14, and the second current collecting member 4 is a positive electrode connecting member and is provided so as to face the terminal through-hole 15. The housing 1 is made of a steel material. The first current collecting member 2 includes a first body portion 21 electrically connected to the tab by welding, and a second body portion 22 extending outward from an edge of the first body portion 21. The second body portion 22 includes a buffer section 23 and a welding section 24, one end of the buffer section 23 being connected to the first body portion 21 and the other end being connected to the welding section 24. A beading portion 12 is provided on a side wall of the housing 1, and the beading portion 12 is provided corresponding to the buffer section 23. After the beading process is performed on the cylindrical battery, the beading portion 12 of the housing 1 is recessed inward to form a first recess 16 on the outer side wall of the housing 1 and a corresponding first protrusion 13 on the inner side wall of the housing 1. The top of the first protrusion 13 presses against the buffer section 23, causing the buffer section 23 to bend and deform, forming a position limiting section 25. At this time, the second body portion 22 extends from the edge of the first body portion 21 to the side of the first protrusion 13 facing the opening 14. Here, the first protrusion 13 and the position limiting section 25 have the same cross-sectional shape (for example, both have a V-shaped cross-sectional shape). The position limiting section 25 and the welding section 24 abut against the first protrusion 13. The cylindrical battery further includes a cover plate assembly 5 that covers the opening 14 and a terminal assembly 6 that is connected to the second current collecting member 4. The cover plate assembly 5 and the opening 14 are crimped and sealed. The cover plate assembly 5 includes a cover plate 51 and a first insulating sealing member 52. The cover plate 51 is fitted to the first insulating sealing member 52 and crimped, and is then insulated from the housing 1. A liquid filling hole is provided at the center of the cover plate 51, and the cover plate 51 further includes a thin annular region that is used to release pressure and prevent explosion. The terminal assembly 6 includes a terminal 61, a second insulating sealing member 62, and an insulating member 63. One end of the terminal 61 is connected to the second current collecting member 4, and the other end passes through the terminal through-hole 15. The second insulating sealing member 62 is provided around the edge of the terminal through-hole 15, and the second insulating sealing member 62 tightly contacts the terminal 61 to achieve sealing. The insulating member 63 is provided between the second insulating sealing member 62 and the second current collecting member 4.

[0021] In this embodiment, the welding section 24 is located on one side of the first protrusion 13 and faces the opening 14, so that welding can be performed directly through the opening 14, facilitating welding. Furthermore, the welding section 24 abuts against the upper surface of the first protrusion 13, resulting in a high yield rate of welding. The upper surface of the first protrusion 13 refers to the surface of the first protrusion 13 facing the opening 14.

[0022] In this embodiment, the length of the welding section 24 is shorter than the length of the position limiting section 25. With this design, the position limiting section 25 has a sufficient length to cover the top of the first protrusion 13, thereby improving the position limiting and fixing effect of the position limiting section 25 on the first protrusion 13.

[0023] In this embodiment, the buffer section 23 has a folded cross section (e.g., an inverted Z-shape). The length of the middle part of the folded cross section ensures a sufficient length for deformation and also provides a sufficient length for the welded section 24 to elongate during welding, thereby ensuring the release of the buffer section 23.

[0024] The manufacturing process of the cylindrical battery according to this embodiment includes the following two main steps.

[0025] First type: In step 1, a cylindrical bare electrode body is obtained by winding. In step 2, rub the positive and negative tabs flat. In step 3, the positive electrode tab is welded to the second current collecting member 4, and the negative electrode tab is welded to the first current collecting member 2. In step 4, the electrode assembly is placed in the housing. In step 5, the second current collecting member 4 is ultrasonically torque welded to the positive electrode terminal 61. In step 6, by grooving, the beading portion 12 of the housing 1 is recessed inward, the outer side wall of the beading portion 12 is recessed to form a first recess 16, and the inner side wall is protruded to form a first protrusion 13, the buffer section 23 is pressed by the first protrusion 13 and bent to form a position limiting section 25, and the first protrusion 13 tightly abuts against the groove formed by the position limiting section 25, and the first protrusion 13 and the position limiting section 25 are fixed. In step 7, the weld section 24 is welded to the first protrusion 13 on the upper surface of the first protrusion 13. In step 8, the cover plate assembly 5 is attached and crimped to seal the opening.

[0026] Second type: In step 1, the positive and negative electrode plates are die-cut to form multiple tabs. In step 2, the electrode is wound to obtain a cylindrical bare electrode body, and the positive and negative electrode tabs are hammered flat. In step 3, the positive electrode tab is welded to the second current collecting member 4, and the negative electrode tab is welded to the first current collecting member 2. In step 4, the electrode assembly is placed in the housing. In step 5, the second current collecting member 4 is ultrasonically torque welded to the positive terminal 61. In step 6, by grooving, the beading portion 12 of the housing 1 is recessed inward, the outer side wall of the beading portion 12 is recessed to form a first recess 16, and the inner side wall is protruded to form a first protrusion 13, the buffer section 23 is pressed by the first protrusion 13 and bent to form a position limiting section 25, and the first protrusion 13 tightly abuts against the groove formed by the position limiting section 25, and the first protrusion 13 and the position limiting section 25 are fixed. In step 7, the weld section 24 is welded to the first protrusion 13 on the upper surface of the first protrusion 13. In step 8, the cover plate assembly 5 is attached and crimped to seal the opening.

[0027] In the cylindrical battery of this embodiment, the beading process step causes the beading portion 12 of the housing 1 to be recessed inward, and therefore the first protrusion 13 formed by the protrusion of the inner side wall of the beading portion 12 presses against the buffer section 23, bending and deforming it. In this case, the buffer section 23 is tensile deformed, and the first protrusion 13 and the position limiting section 25 both have a V-shaped cross-section. The welded section 24 abuts against the upper surface of the first protrusion 13, and the welded section 24 is further welded directly to the upper surface of the boss 13. During welding, the welded section 24 stretches, but because the position limiting section 25 is connected to the welded section 24, sufficient length is provided when the welded section 24 stretches.

[0028] By providing the buffer section 23, performing the beading process, groove-grooving, and then welding, the weld section 24 is welded to the protruding surface of the beading region 12, improving the yield rate of the weld. Furthermore, by providing the welding position corresponding to the beading region 12, it is no longer necessary to prepare two positions on the battery housing, thereby reducing the height of the battery. Furthermore, providing the buffer section 23 significantly reduces stress caused by welding and bending, effectively preventing cracks in the first current collecting member 2, improving the structural rigidity and stability at the welded portion, and ensuring the stability and durability of the cylindrical battery in use.

[0029] <Embodiment 2> An electrical device includes the cylindrical battery. The electrical device may be a vehicle, a mobile phone, a portable device, a laptop, a steamship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a gasoline-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be an electric vehicle, a hybrid vehicle, or a range-extender vehicle, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy may be a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, or an electric airplane toy. The electric tool may be a metal cutting power tool, a polishing power tool, an assembly power tool, or a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer. The embodiment of the present application is not particularly limited to the above electric device.

[0030] In the description of the present invention, the orientations and positional relationships indicated by directional terms such as "center," "lateral direction (X)," "longitudinal direction (Y)," "height direction (Z)," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," and "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are intended only to facilitate the description of the present invention and simplify the explanation. They do not indicate or imply that such devices or parts have a specific orientation or are constructed or operated in a specific orientation, and should not be understood as limitations on the specific protection scope of the present invention.

[0031] Furthermore, terms such as "first," "second," etc. are used merely for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a feature described as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present invention, "plurality" means two or more than two, unless otherwise specified.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms "assemble," "connect," "connect" and the like should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection, a mechanical connection, a direct connection or a connection via an intermediate medium, or an internal communication between two elements. Those skilled in the art can understand the specific meaning of these terms in the present invention based on the specific circumstances.

[0033] The above-described embodiments merely illustrate some embodiments of the present invention, and although the description is specific and detailed, it should not be understood as a limitation on the scope of the present invention. It should be noted that a person skilled in the art may make some modifications and improvements without departing from the concept of the present invention, and all of these fall within the scope of protection of the present invention. That is, the scope of protection of the present invention should be regulated by the appended claims. [Explanation of symbols]

[0034] 1. Housing 11 Containment Room 12 Beading area 13 1st protrusion 14 Aperture 15 Terminal through hole 16 First recess 17 Boss 2 First current collecting member 21 First main body part 22 Second main body part 23 Buffer Zone 24 Welding Section 25 Location Restriction Section 3 Electrode body 4 Second current collecting member 5 Cover plate assembly 51 Lid plate 52 First insulating sealing member 6 Terminal Assembly 61 terminals 62 Second insulating sealing member 63 Insulating materials 7 Second polarity connection plate 71 Welding position

Claims

1. A cylindrical battery, The battery includes a housing (1) and a first current collecting member (2), The housing (1) has an opening (14) and a chamber (11) for accommodating the electrode body (3), The first current collecting member (2) is located in the storage chamber (11) and includes a first body portion (21) and a second body portion (22), the first body portion (21) is connected to the electrode body (3), and the second body portion (22) is connected to the housing (1); The housing (1) has a side wall provided with a beading portion (12), which is recessed into the receiving chamber (11) to form a first recess (16) on the outer side wall of the housing (1) and a corresponding first protrusion (13) on the inner side wall of the housing (1); The second body portion (22) extends from an edge of the first body portion (21) to a side of the first projection (13) facing the opening (14), The second body portion (22) includes a welding section (24) and a position limiting section (25), the position limiting section (25) connects the welding section (24) and the first body portion (21), and the second body portion (22) is connected to the first protrusion (13) by the welding section (24); The welding section (24) is located on the side of the first projection (13) facing the opening (14), The length of the welding section (24) is shorter than the length of the position limiting section (25), The position limiting section (25) and the welding section (24) abut against the surface of the first protrusion (13), The position limiting section (25) and the first protrusion (13) have the same cross-sectional shape. A cylindrical battery characterized by:

2. The position limiting section (25) and the first protrusion (13) both have a V-shaped cross section.

2. The cylindrical battery according to claim 1 .

3. The first body portion (21) and the second body portion (22) are integrally formed.

2. The cylindrical battery according to claim 1 .

4. The device further includes a cover plate assembly (5) that covers the opening (14), the cover plate assembly (5) including a cover plate (51) and a first insulating sealing member (52), the cover plate (51) being fitted into the first insulating sealing member (52) to insulate it from the housing (1).

2. The cylindrical battery according to claim 1 .

5. An electrical device, A cylindrical battery according to any one of claims 1 to 4 is included. An electrical device characterized by:

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