Cover device and cylindrical battery

Abstract

The present application provides a cover plate device and a cylindrical battery. The above-mentioned current collecting disk includes a disk body and a deformable welding sheet, wherein the disk body is provided with a core welding area. The fixed end of the deformable welding sheet is connected to the disk body, and the free end of the deformable welding sheet is provided with a cover plate welding area. The fixed end and the free end of the deformable welding sheet are both used to be staggered with the center of the cover plate assembly, and the portion of the deformable welding sheet between the fixed end and the free end is used to be arranged relative to the center of the cover plate assembly. The deformable welding sheet is opened on the disk body when the core welding area is welded to the core. In this way, the amount of material consumed by the current collecting disk is reduced, the uniformity of the flow is improved, the stress concentration is reduced, and the risk of short circuit caused by the foil being inserted upside down into the core is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical batteries, and in particular to a cover device and a cylindrical battery. Background Art

[0002] The cylindrical battery includes a current collecting plate, which is welded to the cover plate and the winding core respectively. The current collecting plate is first welded to the cover plate, and then welded to the winding core, so that the winding core is electrically connected to the cover plate through the current collecting plate.

[0003] Conventional technology, such as the current collector tray and battery disclosed in document CN213584079U, uses a longer design to prevent the cover from interfering with the welding process between the tray and the winding core. This allows the cover to deviate from the welding position during welding. After welding the tray and the winding core, the tray is bent 180 degrees twice to align the cover with the winding core and fit over the cylindrical housing.

[0004] However, the longer length of the collecting plate will result in a larger amount of consumables for the collecting plate. In order for the collecting plate to be able to bend 180° twice, the bending part of the collecting plate needs to be thinned or dug, but this will cause uneven flow at the bending part, and uneven strength at the bending part, making the stress at the bending part more concentrated. In addition, each bending part has two bending angles, so that the collecting plate has four bending angles, resulting in a greater influence of the bending angle on the thickness of the collecting plate. When the actual bending angle is greater than the set bending angle, the actual thickness of the collecting plate is greater than the set thickness, resulting in pressure on the rolling surface of the core, and there is a risk of short circuit due to the foil being inserted into the core. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cover device and a cylindrical battery that reduce the amount of material consumed by the current collecting plate, improve the uniformity of the flow, reduce stress concentration, and avoid the risk of short circuit caused by the foil being inserted into the winding core.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] A collecting plate, comprising:

[0008] The disk body is provided with a core welding area, wherein the core welding area is used for welding to the core; and

[0009] A deformable welding piece, the fixed end of the deformable welding piece is connected to the disk body, and the free end of the deformable welding piece is provided with a cover welding area, and the cover welding area is used to be welded to the pole of the cover assembly; wherein, the fixed end and the free end of the deformable welding piece are both used to be staggered with the center of the cover assembly, and the part of the deformable welding piece between the fixed end and the free end is used to be arranged relative to the center of the cover assembly, and the deformable welding piece is opened on the disk body when the coil core welding area is welded to the coil core.

[0010] In one embodiment, the collecting disk forms two spaced-apart dividing grooves, the first end of each dividing groove extending to the outer peripheral wall of the collecting disk, so that the collecting disk forms the disk body and the deformable welding piece, the disk body is provided with two winding core welding areas, the deformable welding piece is located between the two dividing grooves, and the two winding core welding areas are respectively located on opposite sides of the deformable welding piece; and / or,

[0011] A deformation notch is formed at the fixed end of the deformation welding piece.

[0012] In one embodiment, the deformable welding piece includes a fixed piece and a welding piece connected to each other, the fixed piece is the fixed end of the deformable welding piece, the first end of the welding piece is bent to form the fixed piece, the welding piece is parallel to the fixed piece, and there is a height difference between the welding piece and the fixed piece, the first end of the welding piece is used to be arranged opposite to the center of the cover plate assembly, and the second end of the welding piece is the movable end of the deformable welding piece.

[0013] In one embodiment, the fixing plate forms a deformation notch.

[0014] In one embodiment, the number of the deformation notches is two, and the two deformation notches are respectively formed on two opposite sides of the fixing plate.

[0015] In one embodiment, the disk body is provided with two welding bosses, and the two winding core welding areas are respectively provided on the two welding bosses, and each welding boss is used to abut against a tab of the winding core; and / or,

[0016] The collecting plate is a stamping structure.

[0017] A pole comprises a column and an eccentric welding portion, wherein the first end of the eccentric welding portion is fixedly connected to the first end of the column, the column is used to be arranged opposite to the portion of the deformable welding piece between the fixed end and the movable end, the second end of the eccentric welding portion is staggered with the column, and the second end of the eccentric welding portion is used to be welded to the cover plate welding area of ​​the deformable welding piece.

[0018] A cover plate device comprises the collecting plate described in any of the above embodiments, and the cover plate device also includes a cover plate assembly, the fixed end and the free end of the deformable welding piece are staggered with the center of the cover plate assembly, the part of the deformable welding piece between the fixed end and the free end is arranged relative to the center of the cover plate assembly, and the cover plate welding area is welded to the cover plate assembly.

[0019] In one embodiment, the cover plate assembly includes a substrate, a pressure plate and the pole according to claim 7, the substrate forms a center hole, the column is passed through the center hole, the second end of the column is riveted to the pressure plate, the pressure plate and the eccentric welding part are respectively located on opposite sides of the substrate, and the second end of the eccentric welding part is welded to the cover plate welding area.

[0020] A cylindrical battery comprises a cylindrical shell, a winding core and the cover plate device described in any of the above embodiments, wherein the winding core and the collecting plate are both accommodated in the cylindrical shell, and each winding core welding area is welded to the winding core.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] 1. The deformable welding piece has a fixed end and a movable end, that is, the deformable welding piece is a cantilever beam structure, which means that the deformable welding piece can be opened on the disk body after being subjected to force; when the coil core welding area is welded to the coil core, since the free end of the deformable welding piece is welded to the pole of the cover plate assembly, the cover plate assembly is opened on the cylindrical shell, which can make the deformable welding piece opened on the disk body and make the cover plate assembly leave the welding path to ensure that the welding head can weld the coil core welding area to the coil core, that is, there is no need for a longer collecting plate to make the cover plate assembly deviate from the welding position, so that the length of the collecting plate is shorter, the amount of consumables of the collecting plate is reduced, and the manufacturing cost of the collecting plate is reduced.

[0023] 2. When the core welding area is welded to the core, the free end of the deformed welding piece is welded to the cover assembly, so the cover assembly is opened on the cylindrical shell, which can make the deformed welding piece open on the disk body and make the cover assembly leave the welding path, avoiding the 180° bending of the collecting plate, so there is no need to thin or dig holes in the collecting plate, which improves the uniformity of the current flow of the collecting plate, and improves the strength uniformity of the collecting plate, and reduces the stress concentration of the collecting plate.

[0024] 3. Since the collecting plate does not need to be bent 180°, the collecting plate is not affected by the bending angle, and the deformed welding piece can recover elastically after the force is unloaded, avoiding the problem of pressure on the rolling surface of the core, thereby avoiding the risk of short circuit caused by the foil being inserted into the core upside down. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of a cylindrical battery according to an embodiment;

[0027] Figure 2 for Figure 1 A schematic structural diagram of a cover device for a cylindrical battery shown;

[0028] Figure 3 for Figure 2 A cross-sectional view of the cover device of the cylindrical battery along line AA;

[0029] Figure 4 for Figure 1 An exploded view of the cover assembly of a cylindrical battery is shown;

[0030] Figure 5a for Figure 1 A schematic structural diagram of a current collecting plate of a cylindrical battery shown;

[0031] Figure 5b for Figure 1 The schematic diagram of the structure of the current collecting plate of the cylindrical battery shown in another perspective;

[0032] Figure 5c for Figure 1 The schematic structural diagram of the current collecting plate of the cylindrical battery shown in FIG.

[0033] Figure 6 for Figure 1 A schematic structural diagram of a cylindrical battery in another state is shown;

[0034] Figure 7 for Figure 6 An enlarged schematic diagram of the cylindrical battery shown at B;

[0035] Figure 8 Schematic diagram of the structure of a cover device according to another embodiment. DETAILED DESCRIPTION

[0036] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide the reader with a more thorough and comprehensive understanding of the present disclosure.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The present application provides a current collecting disc, which includes a disc body and a deformable welding sheet. The disc body is provided with a core welding area, which is used to weld to the core. The fixed end of the deformable welding sheet is connected to the disc body, and the free end of the deformable welding sheet is provided with a cover plate welding area, which is used to weld to the pole of the cover plate assembly. The fixed end and the free end of the deformable welding sheet are both used to be staggered with the center of the cover plate device, and the portion of the deformable welding sheet between the fixed end and the free end is used to be arranged relative to the center of the cover plate device. The deformable welding sheet is opened from the disc body when the core welding area is welded to the core.

[0040] The present application also provides a pole, including a column and an eccentric welding part, the column is used to be arranged opposite to the part of the deformable welding piece between the fixed end and the movable end, the first end of the eccentric welding part is fixedly connected to the first end of the column, the second end of the eccentric welding part is staggered with the column, and the second end of the eccentric welding part is used to be welded to the cover plate welding area of ​​the deformable welding piece.

[0041] The present application also provides a cover plate device, including the above-mentioned collecting plate and cover plate assembly, the fixed end and the free end of the deformable welding piece are staggered with the center of the cover plate assembly, the part of the deformable welding piece between the fixed end and the free end is arranged relative to the center of the cover plate assembly, and the cover plate welding area is welded to the cover plate assembly.

[0042] The present application also provides a cylindrical battery, comprising a cylindrical shell, a winding core and the above-mentioned cover plate device, wherein the winding core and the collecting plate are both accommodated in the cylindrical shell, and each winding core welding area is welded to the winding core.

[0043] The above-mentioned current collecting plate, cover plate device and cylindrical battery, the deformable welding piece has a fixed end and a movable end, that is, the deformable welding piece is a cantilever beam structure, which means that the deformable welding piece can be flipped up on the plate body after being subjected to force; when the core welding area is welded to the core, the free end of the deformable welding piece is welded to the pole of the cover plate assembly, and the cover plate assembly is flipped up on the cylindrical shell, which can make the deformable welding piece flip up on the plate body and make the cover plate assembly leave the welding path to ensure that the welding head can weld the core welding area to the core, that is, there is no need for a longer current collecting plate to make the cover plate assembly deviate from the welding position, so that the length of the current collecting plate is shorter, the amount of consumables of the current collecting plate is reduced, and the manufacturing cost of the current collecting plate is reduced; at the same time, it also avoids bending the current collecting plate 180°, so there is no need to thin or dig holes in the current collecting plate, which improves the current flow uniformity of the current collecting plate, improves the strength uniformity of the current collecting plate, and reduces the stress concentration of the current collecting plate. In addition, since there is no need to bend the collecting plate 180°, the collecting plate is not affected by the bending angle, and the deformed welding piece can elastically recover after the force is unloaded, avoiding the problem of pressure on the rolling surface of the core, and thus avoiding the risk of short circuit caused by the foil being inserted upside down into the core.

[0044] The above-mentioned pole, the column is used to be arranged at the center of the cover plate assembly, the column is used to be arranged relative to the part between the fixed end and the free end of the deformed welding piece, and the column is also used to be staggered with the fixed end and the free end of the deformed welding piece. The second end of the eccentric welding part is used to weld with the cover plate welding area on the movable end of the deformed welding piece, so that the cover plate assembly can drive the deformed welding piece to be opened on the disk body, and then the cover plate assembly can deviate from the welding path to ensure that the welding head can weld the core welding area to the core, avoiding the use of a longer traditional collecting plate, making the length of the collecting plate shorter, reducing the amount of consumables of the collecting plate, reducing the manufacturing cost of the collecting plate, and also avoiding 180° bending of the collecting plate, so that there is no need to thin or dig holes in the collecting plate, improving the current uniformity of the collecting plate, and improving the strength uniformity of the collecting plate, reducing the stress concentration of the collecting plate. In addition, since there is no need to bend the collecting plate 180°, the collecting plate is not affected by the bending angle, and the deformed welding piece can elastically recover after the force is unloaded, avoiding the problem of pressure on the rolling surface of the core, and thus avoiding the risk of short circuit caused by the foil being inserted upside down into the core.

[0045] To better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below with reference to specific embodiments:

[0046] like Figure 1 As shown, a cylindrical battery 10 according to an embodiment includes a cylindrical shell 10a, a winding core, and a cover device 10b. The winding core is accommodated in the cylindrical shell 10a, and the cover device 10b is welded to the winding core.

[0047] like Figures 2 to 3As shown, in one embodiment, the cover plate device 10b includes a collecting plate 100 and a cover plate assembly 300. The collecting plate 100 is accommodated in the cylindrical shell 10a, and the collecting plate 100 is welded to the cover plate assembly 300 and the winding core respectively.

[0048] like Figure 4 As shown in Figure 5, in one embodiment, the collecting disk 100 includes a disk body 110 and a deformable welding piece 120. The disk body 110 is provided with a core welding area 111, and the core welding area 111 is used for welding to the core. The deformable welding piece 120 is a cantilever beam structure. The fixed end of the deformable welding piece 120 is connected to the disk body 110 so that the deformable welding piece 120 can be opened on the disk body 110. The free end of the deformable welding piece 120 is provided with a cover welding area 1201, and the cover welding area 1201 is used for welding to the pole 330 of the cover assembly 300. The welding area of ​​the pole 330 is set away from the center of the cover assembly 300. Among them, the fixed end and the free end of the deformable welding piece 120 are used to be staggered with the center of the cover assembly 300, and the part of the deformable welding piece 120 between the fixed end and the free end is used to be set relative to the center of the cover assembly 300. The deformable welding piece 120 is flipped over the disk body 110 when the core welding area 111 is welded to the core, so that the cover assembly 300 deviates from the welding path.

[0049] like Figure 4 As shown in Figure 5 , in this embodiment, the welding area of ​​the pole 330 is offset from the center of the cover plate assembly 300. The cover plate welding area 1201 is used to weld to the pole 330 of the cover plate assembly 300, electrically connecting the current collecting tray 100 and the cover plate assembly 300. The current collecting tray 100 and the cover plate assembly 300 together form the cover plate assembly 10b. The core welding area 111 is also used to weld to the core. That is, the core welding area 111 is welded to the core, electrically connecting the current collecting tray 100 and the core, and further electrically connecting the core to the cover plate assembly 300 through the current collecting tray 100.

[0050] like Figure 6 and Figure 7As shown, further, before the winding core welding area 111 is welded to the winding core, the collecting plate 100 and the cover plate assembly 300 together form a cover plate device 10b, and the winding core is accommodated in the cylindrical shell 10a. When welding the core welding area 111 of the collecting disk 100 to the core, first fix the disk body 110 on the core so that the core welding area 111 contacts the core. At this time, the cover assembly 300 covers the cylindrical shell 10a, and then the cover assembly 300 is opened on the cylindrical shell 10a to make the cover assembly 300 deviate from the welding path. Since the cover welding area 1201 of the movable end of the deformation welding piece 120 is welded to the cover assembly 300, the deformation welding piece 120 is synchronously opened on the disk body 110, and then the core welding area 111 of the disk body 110 is welded to the core. Finally, the force of the cover assembly 300 is removed, that is, the force of the deformation welding piece 120 is removed, so that the deformation welding piece 120 elastically recovers and drives the cover assembly 300 to cover the cylindrical shell 10a.

[0051] The above-mentioned cylindrical battery 10, cover plate device 10b and current collecting plate 100, the deformable welding piece 120 has a fixed end and a movable end, that is, the deformable welding piece 120 is a cantilever beam structure, which causes the deformable welding piece 120 to be opened on the plate body 110 after being subjected to force; when the winding core welding area 111 is welded to the winding core, since the free end of the deformable welding piece 120 is welded to the pole 330 of the cover plate assembly 300, the cover plate assembly 300 is opened on the cylindrical shell 10a, which can make the deformable welding piece 120 open on the plate body 110 and make the cover plate assembly 300 leave. The welding path ensures that the welding head can weld the core welding area 111 to the core. That is, there is no need for a longer collecting plate 100 to cause the cover plate assembly 300 to deviate from the welding position, making the collecting plate 100 shorter, reducing the amount of material consumables of the collecting plate 100, and reducing the manufacturing cost of the collecting plate 100. At the same time, it also avoids bending the collecting plate 100 by 180 degrees, so there is no need to thin or dig holes in the collecting plate 100, improving the uniformity of the flow of the collecting plate 100, and improving the uniformity of the strength of the collecting plate 100, reducing the stress concentration of the collecting plate 100. In addition, since there is no need to bend the collecting plate 100 by 180 degrees, the collecting plate 100 is not affected by the bending angle, and the deformed welding piece 120 can elastically recover after the force is released, avoiding the problem of pressure on the rolling surface of the core, and thus avoiding the risk of short circuit caused by the foil being inserted into the core upside down.

[0052] like Figure 3As shown in Figure 5, in one embodiment, the pole 330 includes a column 331 and an eccentric welding portion 332, the column 331 is used to be arranged at the center of the cover plate assembly 300, the column 331 is used to be arranged opposite to the portion of the deformable welding piece 120 between the fixed end and the movable end, the first end of the eccentric welding portion 332 is fixedly connected to the first end of the column 331, the second end of the eccentric welding portion 332 is staggered from the column 331, and the second end of the eccentric welding portion 332 is used to be welded to the cover plate welding area 1201 of the deformable welding piece 120 of the collecting plate 100.

[0053] The above-mentioned pole, the column 331 is used to be arranged at the center of the cover assembly 300, the column 331 is used to be arranged relative to the portion between the fixed end and the free end of the deformable welding piece 120, and the column 331 is also used to be staggered with the fixed end and the free end of the deformable welding piece 120. The second end of the eccentric welding portion 332 is used to be welded to the cover welding area 1201 on the movable end of the deformable welding piece 120, so that the cover assembly 300 can drive the deformable welding piece 120 to be opened on the disk body 110, thereby allowing the cover assembly 300 to The welding path is deviated to ensure that the welding head can weld the core welding area 111 to the core, avoiding the use of a traditional long current collecting plate, making the length of the current collecting plate 100 shorter, reducing the amount of consumables of the current collecting plate 100, and reducing the manufacturing cost of the current collecting plate 100. At the same time, it also avoids the need to bend the current collecting plate 100 by 180 degrees, so there is no need to thin or dig holes in the current collecting plate 100, improving the uniformity of the flow of the current collecting plate 100, and improving the uniformity of the strength of the current collecting plate 100, and reducing stress concentration in the current collecting plate 100. In addition, since the current collecting plate 100 does not need to be bent by 180 degrees, the current collecting plate 100 is not affected by the bending angle, and the deformed welding piece 120 can elastically recover after the force is released, avoiding the problem of pressure on the flat surface of the core, and thus avoiding the risk of short circuit caused by the foil being inserted into the core upside down.

[0054] like Figure 3 and Figure 4 As shown, in one embodiment, the cover assembly 300 includes a substrate 310, a pressure plate 320 and a pole 330, the substrate 310 forms a center hole 311, and the column 331 is passed through the center hole 311, so that the column 331 is set at the center of the cover assembly 300, and the second end of the column 331 is riveted to the pressure plate 320, and the pressure plate 320 and the eccentric welding part 332 are respectively located on opposite sides of the substrate 310, and the second end of the eccentric welding part 332 is welded to the cover welding area 1201.

[0055] like Figure 4 As shown, in one embodiment, the eccentric welding portion 332 is perpendicular to the column 331 , so that the extension direction of the eccentric welding portion 332 is parallel to the extension direction of the base plate 310 , thereby improving the structural compactness of the cover plate assembly 300 .

[0056] like Figure 5a As shown, in one embodiment, the outer peripheral wall of the collecting plate 100 is in an arc shape, so that the collecting plate 100 is adapted to the cover plate assembly 300 .

[0057] like Figure 4 and Figure 5a As shown, in one embodiment, the collecting plate 100 forms two spaced-apart dividing grooves 101, and the first end of each dividing groove 101 extends to the outer peripheral wall of the collecting plate 100, so that the collecting plate 100 forms a plate body 110 and a deformable welding piece 120, and the plate body 110 is provided with two winding core welding areas 111, and the deformable welding piece 120 is located between the two dividing grooves 101. The two winding core welding areas 111 are respectively located on opposite sides of the deformable welding piece 120, so that the collecting plate 100 has a symmetrical structure.

[0058] like Figure 5a As shown, in one embodiment, a deformation notch 1202 is formed at the fixed end of the deformable welding piece 120, so that the fixed end of the deformable welding piece 120 is easier to deform, thereby making it easier for the deformable welding piece 120 to be opened from the disk body 110, and suppressing the stress concentration of the deformable welding piece 120, thereby reducing the risk of the fixed end of the deformable welding piece 120 breaking.

[0059] like Figure 5a As shown, in one embodiment, the inner wall of the deformation notch 1202 is arc-shaped to reduce stress concentration of the deformable welding piece 120 at the deformation notch 1202 .

[0060] like Figure 5a and Figure 5b As shown, in one embodiment, the deformable welding piece 120 includes a connected fixing piece 121 and a welding piece 122, the fixing piece 121 is the fixed end of the deformable welding piece 120, the first end of the welding piece 122 is bent to form the fixing piece 121, so that a fold 123 is formed between the welding piece 122 and the fixing piece 121, the welding piece 122 is parallel to the fixing piece 121, and there is a height difference between the welding piece 122 and the fixing piece 121, the first end of the welding piece 122 is used to be arranged relative to the center of the cover plate assembly 300, and the second end of the welding piece 122 is the movable end of the deformable welding piece 120.

[0061] like Figure 5a and Figure 5bAs shown, in this embodiment, the fold 123 formed between the welding piece 122 and the fixing piece 121 improves the resilience of the deformable welding piece 120, making it easier to unfold the deformable welding piece 120 from the disk body 110 and return to its pre-folded position after the force is released. Because the welding piece 122 is parallel to the fixing piece 121 and there is a height difference between the welding piece 122 and the fixing piece 121, the bending angle of the deformable welding piece 120 at the fold 123 is less than 180 degrees. Consequently, the deformable welding piece 120 does not need to be thinned or perforated at the fold 123, ensuring good flow uniformity and strength uniformity at the fold 123.

[0062] like Figure 5a As shown, in one embodiment, the fixing plate 121 forms a deformation notch 1202, making the fixing plate 121 easier to deform. Specifically, the fixed end of the deformable welding plate 120 is easier to deform, thereby making it easier for the deformable welding plate 120 to be lifted off the plate body 110, suppressing stress concentration on the deformable welding plate 120, and reducing the risk of breakage at the fixed end of the deformable welding plate 120. In this embodiment, the fixing plate 121 forms a deformation notch 1202, and a fold 123 is formed between the fixing plate 121 and the welding plate 122. This improves the resilience of the deformable welding plate 120, making it easier for the deformable welding plate 120 to be lifted off the plate body 110, suppressing the problem of breakage of the deformable welding plate 120, and allowing the deformable welding plate 120 to more easily return to its original shape, thus ensuring the shape consistency of the current collecting plate 100 before and after welding.

[0063] like Figure 5a As shown, in one embodiment, the inner wall of the deformation notch 1202 is arc-shaped to reduce stress concentration of the deformable welding piece 120 at the deformation notch 1202 .

[0064] like Figure 5a As shown, in one embodiment, the deformable welding piece 120 is rectangular. Of course, in other embodiments, the deformable welding piece 120 can also be square, triangular or other existing shapes.

[0065] like Figure 5a As shown, in one embodiment, the number of the deformation notches 1202 is two, and the two deformation notches 1202 are respectively formed on two opposite sides of the fixing plate 121, so that the area between the two deformation notches 1202 is easier to deform, thereby improving the resilience of the deformation welding plate 120.

[0066] like Figures 5a to 5cAs shown, in one embodiment, the disk body 110 is provided with two welding bosses 110a, and two core welding areas 111 are provided on the two welding bosses 110a. Each welding boss 110a is used to be set toward the core, and each welding boss 110a is used to abut against the pole ear of the core, so that each welding boss 110a compacts the pole ear of the core, thereby improving the welding quality of the core.

[0067] like Figure 5c As shown, in one embodiment, the collecting plate 100 is a stamping structure, which improves the manufacturing efficiency of the collecting plate 100.

[0068] like Figure 8 As shown, in another embodiment, the pole 330 is entirely disposed away from the center of the cover plate assembly 300 , and one end of the pole 330 is welded to the cover plate welding area 1201 .

[0069] Compared with the prior art, the present invention has at least the following advantages:

[0070] 1. The deformable welding piece 120 has a fixed end and a movable end, that is, the deformable welding piece 120 is a cantilever beam structure, which means that the deformable welding piece 120 can be opened on the disk body 110 after being subjected to force; when the core welding area 111 is welded to the core, since the free end of the deformable welding piece 120 is welded to the pole 330 of the cover plate assembly 300, the cover plate assembly 300 is opened on the cylindrical shell 10a, which can make the deformable welding piece 120 opened on the disk body 110 and make the cover plate assembly 300 leave the welding path to ensure that the welding head can weld the core welding area 111 to the core, that is, there is no need for a longer collecting plate 100 to make the cover plate assembly 300 deviate from the welding position, so that the length of the collecting plate 100 is shorter, the amount of consumables of the collecting plate 100 is reduced, and the manufacturing cost of the collecting plate 100 is reduced.

[0071] 2. When the core welding area 111 is welded to the core, since the free end of the deformable welding piece 120 is welded to the cover plate assembly 300, the cover plate assembly 300 is opened on the cylindrical shell 10a, which can make the deformable welding piece 120 open on the disk body 110, and make the cover plate assembly 300 leave the welding path, avoiding the 180° bending of the collecting plate 100, so there is no need to thin or dig holes in the collecting plate 100, thereby improving the flow uniformity of the collecting plate 100, and improving the strength uniformity of the collecting plate 100, reducing the stress concentration of the collecting plate 100.

[0072] 3. Since the collecting plate does not need to be bent 180°, the collecting plate 100 is not affected by the bending angle, and the deformed welding piece 120 can elastically recover after the force is unloaded, thereby avoiding the problem of pressure on the rolling surface of the core, and thus avoiding the risk of short circuit caused by the foil being inserted upside down into the core.

[0073] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A cover device, characterized in that: It includes a collecting plate and a cover plate assembly, and the collecting plate includes: The disk body is provided with a core welding area, wherein the core welding area is used for welding to the core; and A deformable welding piece, wherein a fixed end of the deformable welding piece is connected to the disk body, a free end of the deformable welding piece is provided with a cover welding area, and the deformable welding piece is opened from the disk body when the core welding area is welded to the core; The deformable welding piece includes a fixed piece and a welding piece connected to each other, the fixed piece being the fixed end of the deformable welding piece, the first end of the welding piece being bent and formed on the fixed piece, the welding piece being parallel to the fixed piece, and there being a height difference between the welding piece and the fixed piece, the first end of the welding piece being used to be arranged opposite to the center of the cover plate assembly, and the second end of the welding piece being the movable end of the deformable welding piece; The cover plate assembly includes a base plate, a pressure plate and a pole; the pole includes a column and an eccentric welding portion, the first end of the eccentric welding portion is fixedly connected to the first end of the column; the base plate forms a central hole, the column is passed through the central hole, and the second end of the column is riveted to the pressure plate; the column and the deformation welding piece are arranged opposite to each other between the fixed end and the movable end, the second end of the eccentric welding portion is staggered with the column, the pressure plate and the eccentric welding portion are respectively located on opposite sides of the base plate, and the second end of the eccentric welding portion is welded to the cover plate welding area; The fixed end and the free end of the deformation welding piece are staggered with respect to the center of the cover plate assembly; The collecting plate is a stamping structure.

2. The cover device according to claim 1, characterized in that: The collecting disk is formed with two spaced-apart dividing grooves, the first end of each dividing groove extending to the outer peripheral wall of the collecting disk, so that the collecting disk forms the disk body and the deformable welding piece, the disk body is provided with two winding core welding areas, the deformable welding piece is located between the two dividing grooves, and the two winding core welding areas are respectively located on opposite sides of the deformable welding piece; and / or, A deformation notch is formed at the fixed end of the deformation welding piece.

3. The cover device according to claim 1, characterized in that: A deformation notch is formed at the fixed end of the deformation welding piece. The number of the deformation notches is two, and the two deformation notches are respectively formed on two opposite sides of the fixing piece.

4. The cover device according to claim 1, characterized in that: The disc body is convexly provided with two welding bosses, and the two winding core welding areas are respectively provided on the two welding bosses, and each welding boss is used to abut against the pole ear of the winding core.

5. A cylindrical battery, characterized in that: It comprises a cylindrical shell, a winding core and the cover plate device according to any one of claims 1 to 4, wherein the winding core and the collecting plate are both accommodated in the cylindrical shell, and each winding core welding area is welded to the winding core.

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