Secondary battery

Abstract

The utility model relates to the technical field of battery manufacturing, and discloses a secondary battery. The secondary battery comprises a core body with a tab, a gasket and a collector plate, the gasket is arranged between the core body and the collector plate, the tab bypasses the gasket so that the end part of the tab is positioned on one side, deviating from the core body, of the gasket, and the collector plate and the tab are welded and connected on one side, deviating from the core body, of the gasket. According to the secondary battery provided by the utility model, the welding point of the tab and the collector plate extends to one side, deviating from the core body, of the gasket by arranging the gasket, so that on one hand, the tab and the collector plate are welded and connected, the virtual connection problem is avoided, the connection reliability is ensured, and a complicated connection mode is not needed; on the other hand, the problems that metal particles generated during welding of the current collecting plate and the tab slide into the core body, and a diaphragm is scalded during welding can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a secondary battery. Background Art

[0002] Existing multi-ear or full-ear cylindrical batteries generally use laser penetration to weld the collector plate and the ear to achieve electrical connection. However, the metal particles generated during the welding process have the risk of sliding along the gap between the ear and into the battery cell, and these metal particles are difficult to detect. The falling metal particles can easily cause a short circuit in the battery and cause thermal runaway of the battery. On the other hand, the internal welding condition is difficult to detect during laser welding, and the occasional fluctuation of the laser can easily weld through the ear, which will burn the diaphragm, causing the battery to be scrapped or forming a potential short circuit risk. Thirdly, due to the current cylindrical battery structure, the pole piece cannot be set with a pole ear in the initial length of winding (usually 200-300mm), which leads to uneven distribution of the pole piece current density, limiting the further improvement of the battery's fast charging capability. Therefore, the existing technology needs to be improved and perfected.

[0003] In this regard, Chinese invention patent CN101604737A provides a secondary battery, which includes a winding core and a cover plate, wherein a pole ear extends from the end of the winding core, and the battery is also provided with a pole ear lead-out device placed at the end of the winding core and a second gasket arranged between the pole ear lead-out device and the cover plate, wherein the pole ear at the end of the winding core extends through the outer edge of the pole ear lead-out device or the opening on the pole ear lead-out device, and the pole ear is pressed between the second gasket and the conductive layer of the pole ear lead-out device through a connecting piece, and during installation, the pole ear is pressed by a nut and a screw. This pressing method has the following defects:

[0004] (1) Mechanical pressing has poorer conductivity reliability than laser welding and has the risk of false connection;

[0005] (2) When the nut is being screwed, the gasket may rotate, which may cause the risk of the tab being torn. In addition, metal chips are easily generated during screwing, which may affect the safety performance of the battery.

[0006] (3) The nut and screw have a large mass, which is not conducive to improving the battery energy density. Utility Model Content

[0007] In order to solve the above technical problem or at least partially solve the above technical problem, the utility model provides a secondary battery.

[0008] The utility model provides a secondary battery, comprising a core body with a pole ear, a gasket and a current collecting plate, wherein the gasket is arranged between the core body and the current collecting plate, the pole ear bypasses the gasket so that the end of the pole ear is located on the side of the gasket away from the core body, and the current collecting plate is welded and connected to the pole ear on the side of the gasket away from the core body.

[0009] Optionally, the gasket adopts an annular structure, and there are multiple pole ears, and the multiple pole ears can bypass the gasket from the inside and / or outside of the gasket.

[0010] Optionally, an annular protrusion is provided on a side of the gasket facing the core body.

[0011] Optionally, the plurality of pole ears bypass the gasket from the inner side and the outer side of the gasket, and the ends of the plurality of pole ears form a groove, and a protrusion is provided on the side of the collecting plate at a position corresponding to the groove.

[0012] Optionally, the plurality of pole ears bypass the gasket from the inside and outside of the gasket, and a portion of the pole ears on one side can be located above the plurality of pole ears on the other side, and the edge of the current collecting plate is bent so that the current collecting plate can contact the pole ears on the outermost layer.

[0013] Optionally, the plurality of pole tabs bypass the gasket from the inside and outside of the gasket, and the portions of the pole tabs bypassing the gasket extend in a direction parallel to the plane of the gasket, and the current collecting plate contacts the pole tabs at the outermost layer.

[0014] Optionally, ends of the plurality of pole ears arranged on the same side are flush or uneven.

[0015] Optionally, the plurality of pole tabs bypass the gasket from the inside or outside of the gasket, and the portion of the pole tabs bypassing the gasket extends in a direction parallel to the plane of the gasket, and the current collecting plate contacts the pole tabs at the outermost layer.

[0016] Optionally, ends of the plurality of pole tabs are flush or uneven.

[0017] Optionally, the gasket is made of insulating material or non-insulating material.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0019] The secondary battery provided by the utility model extends the welding point between the pole ear and the current collecting disk to the side of the gasket away from the core body by arranging a gasket. On the one hand, this design method enables the pole ear and the current collecting disk to be welded and connected, avoiding the problem of virtual connection and ensuring the reliability of the connection without the need for a complicated connection method, thus avoiding affecting the energy density of the battery. On the other hand, it can prevent the metal particles generated when the current collecting disk and the pole ear are welded and slip into the core body, and the diaphragm is burned by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0021] In order to more clearly illustrate the implementation mode of the utility model or the technical solution in the prior art, the drawings required for use in the implementation mode or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the secondary battery described in the embodiment of the utility model;

[0023] Figure 2 A cross-sectional view of a secondary battery according to a first embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A cross-sectional view of the design of the electrode tab and the current collecting plate in the secondary battery described in;

[0025] Figure 4 A cross-sectional view of a secondary battery according to a second embodiment of the present utility model;

[0026] Figure 5 for Figure 4 A cross-sectional view of the design of the electrode tab and the current collecting plate in the secondary battery described in;

[0027] Figure 6 A cross-sectional view of a secondary battery according to a third embodiment of the present utility model;

[0028] Figure 7 for Figure 6 A cross-sectional view of the design of the electrode tab and the current collecting plate in the secondary battery described in;

[0029] Figure 8 A cross-sectional view of a secondary battery according to a fourth embodiment of the present utility model;

[0030] Fig. 9 for Figure 8 A cross-sectional view of the design of the electrode tab and the current collecting plate in the secondary battery described in;

[0031] Fig.10 A cross-sectional view of a secondary battery according to a fifth embodiment of the present invention;

[0032] Fig.11 for Fig.10 A cross-sectional view of the design of the electrode tab and the current collecting plate in the secondary battery described in;

[0033] Fig.12This is a schematic diagram of the structure of the gasket described in the embodiment of the utility model;

[0034] Fig.13 This is a front view of the gasket described in the embodiment of the utility model;

[0035] Fig.14 This is a front view of the gasket provided with the annular protrusion in the embodiment of the utility model;

[0036] Fig.15 This is a schematic diagram of the structure of the current collecting plate described in the embodiment of the utility model;

[0037] Fig.16 A front view of the current collecting plate provided with the protrusion in the embodiment of the utility model;

[0038] Fig.17 This is a front view of the collector plate with bent edges according to an embodiment of the utility model;

[0039] Fig.18 This is a front view of the current collecting plate described in the embodiment of the utility model;

[0040] Fig.19 It is a structural schematic diagram of the winding method of the pole ear described in the embodiment of the utility model;

[0041] Fig. 20 It is a structural schematic diagram of the matching mode between the electrode tab and the current collecting plate described in the embodiment of the utility model.

[0042] Description of Reference Numerals

[0043] 1. Core; 11. Pole ear; 2. Gasket; 21. Annular protrusion; 3. Collecting plate; 31. Protrusion; 4. Shell; 5. Pole. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0045] The following description sets forth many specific details to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the implementation methods in the specification are only part of the implementation methods of the present invention, rather than all of the implementation methods.

[0046] Combination Figures 1 to 11As shown, the secondary battery provided by the embodiment of the utility model includes a core 1 with a pole ear 11, a gasket 2 and a current collecting plate 3. It is understandable that the secondary battery should also include a shell 4 and a pole 5 and other structures, wherein the core 1, the gasket 2 and the current collecting plate 3 and other components are all arranged in the shell 4, the pole 5 is penetrated through the top of the shell 4, and the pole 5 extends into the shell 4. One end of the pole 5 is connected to the current collecting plate 3, or, in some embodiments, the pole 5 and the current collecting plate 3 are an integrated structure. The gasket 2 is arranged between the core 1 and the current collecting plate 3, and the pole 5 is connected to the current collecting plate 3. Fig.19 and Fig. 20 As shown, the pole lug 11 bypasses the gasket 2 so that the end of the pole lug 11 is located on the side of the gasket 2 away from the core 1, wherein the pole lug 11 is in a strip structure, and the way in which the pole lug 11 bypasses the gasket 2 is not limited, and the specific way is described below. The collector plate 3 is welded to the pole lug 11 on the side of the gasket 2 away from the core 1, specifically, the part of the pole lug 11 away from the core 1 and the position in contact with the collector plate 3 is welded to the collector plate 3. Among them, the core 1 can be a winding core or other forms of battery cells, and the pole lug 11 can be a multi-pole lug, a full pole lug or other forms of pole lug 11, which are not restrictive.

[0047] The secondary battery provided by the utility model extends the welding point between the pole ear 11 and the current collecting disk 3 to the side of the gasket 2 away from the core 1 by setting the gasket 2. On the one hand, this design method enables the pole ear 11 to be welded and connected with the current collecting disk 3 to avoid the problem of virtual connection and ensure the reliability of the connection without the need for a complicated connection method to avoid affecting the energy density of the battery. On the other hand, it can prevent the metal particles generated when the current collecting disk 3 and the pole ear 11 are welded to slip into the core 1, and the diaphragm is burned by welding.

[0048] Combination Fig.12 and Fig.13 As shown, the gasket 2 of the present application adopts an annular structure, and there are multiple pole ears 11, and multiple pole ears 11 can bypass the gasket 2 from the inside and / or outside of the gasket 2. Among them, the design of the gasket 2 adopting an annular structure can reduce its own weight, and there are more ways for the pole ears 11 to bypass the gasket 2 to meet different winding requirements. The inside of the gasket 2 refers to the inner ring wall of the gasket 2, and the outside of the gasket 2 refers to the outer ring wall of the gasket 2. Multiple pole ears 11 can all bypass the gasket 2 from the inside of the gasket 2, or, multiple pole ears 11 can all bypass the gasket 2 from the outside of the gasket 2, or, some pole ears 11 bypass the gasket 2 from the inside of the gasket 2, and another part of the pole ears 11 bypass the gasket 2 from the outside of the gasket 2. These are not restrictive and can be selected according to actual needs.

[0049] Limited by the traditional cylindrical battery structure, the pole tab 11 cannot be set in the initial length of the winding pole piece, resulting in uneven distribution of the pole piece current density. The winding method of the pole tab 11 in the present application can set the pole tab 11 on the entire pole piece, so that the current density distribution of the battery cell pole piece can be more uniform.

[0050] like Fig.14 As shown, an annular protrusion 21 is provided on the side of the gasket 2 facing the core body 1. This design allows the pole ear 11 to extend along the inner and outer circumferences of the annular protrusion 21 toward the inside or outside of the gasket 2 and bypass the gasket 2, which facilitates the winding of the pole ear 11 during actual operation and improves work efficiency.

[0051] In some embodiments, the cross-section of the annular protrusion 21 is an inverted triangle, which further increases the winding effect of the tab 11 .

[0052] In some embodiments, the annular protrusion 21 and the gasket 2 are formed in an integral structure to increase the convenience of production.

[0053] The winding method of the pole ear 11 and the setting method of the current collecting plate 3 of the present application include but are not limited to the following embodiments:

[0054] First Implementation Method

[0055] Combination Figure 2 and Figure 3 As shown, a plurality of pole ears 11 bypass the gasket 2 from the inner side and the outer side, and the ends of the plurality of pole ears 11 form a groove, and a protrusion 31 is provided on the side of the collecting plate 3 at a position corresponding to the groove.

[0056] Specifically, the plurality of pole ears 11 are divided into two parts from the middle position, one part of the pole ears 11 bypasses the gasket 2 from the inner side of the gasket 2, and the other part of the pole ears 11 bypasses the gasket 2 from the outer side of the gasket 2, so that the plurality of pole ears 11 after bypassing the gasket 2 are divided into two corresponding parts. Among them, the lengths of the above-mentioned part of the pole ears 11 are the same or different, and correspondingly, the lengths of the other part of the pole ears 11 may also be the same or different, so that after the above-mentioned part of the pole ears 11 bypasses the gasket 2, among the part of the pole ears 11 located above the gasket 2, the length of the part of the pole ears 11 close to the gasket 2 is greater than the length of the part of the pole ears 11 far away from the gasket 2, and the lengths of the plurality of partial pole ears 11 at this location are decreasing from bottom to top. Similarly, the design method of the other part of the pole ears 11 is consistent with the design method of the part of the pole ears 11 at this location, so that the plurality of partial pole ears 11 located above the gasket 2 can form grooves. At this time, in order to increase the contact quantity and contact area between the collecting plate 3 and the pole ears 11, combined with Figure 2 , Figure 3 and Fig.16As shown, a protrusion 31 matching the groove is provided at a position on the side of the collecting plate 3 corresponding to the groove, so that the protrusion 31 of the collecting plate 3 can contact the ends of the plurality of pole tabs 11 and the contact position is welded.

[0057] In this design, the tabs 11 can be concentrated to the maximum extent between the current collecting plate 3 and the gasket 2, the number of welded tabs 11 is large, the utilization rate of the tabs 11 is high, the length of the tabs 11 in the unwelded area is minimized, and the uniformity of current distribution is improved. The extension method of the gasket 2 and the design method of the current collecting plate 3 can increase the contact area between the current collecting plate 3 and the tabs 11, reduce the situation of false welding and leaking welding, and ensure the performance of the battery.

[0058] In other embodiments, multiple pole lugs 11 bypass the gasket 2 from the inside and outside of the gasket 2, and a portion of the pole lugs 11 on one side can be located above the multiple pole lugs 11 on the other side, and the edge of the collecting plate 3 is bent so that the collecting plate 3 can contact the pole lug 11 on the outermost layer. Specifically, among the multiple pole lugs 11 bypassing the gasket 2 from the inside, the pole lug 11 located on the outermost layer contacts the collecting plate 3, and among the multiple pole lugs 11 bypassing the gasket 2 from the outside, the pole lug 11 located on the outermost layer contacts the collecting plate 3.

[0059] Specifically, the plurality of pole ears 11 are divided into two parts from the middle position, one part of the pole ears 11 bypasses the gasket 2 from the inner side of the gasket 2, and the other part of the pole ears 11 bypasses the gasket 2 from the outer side of the gasket 2, so that the plurality of pole ears 11 after bypassing the gasket 2 are divided into two corresponding parts.

[0060] In the present application, after the pole lug 11 bypasses the gasket 2 from the outside of the gasket 2, a part of the multiple pole lugs 11 is located above the gasket 2, and the pole lug 11 located at the top of the part of the pole lugs 11 is called the outermost pole lug 11, and the outermost pole lug 11 is in contact with the current collecting plate 3. Similarly, after the pole lug 11 bypasses the gasket 2 from the inside of the gasket 2, a part of the multiple pole lugs 11 is located above the gasket 2, and the pole lug 11 located at the top of the part of the pole lugs 11 is also called the outermost pole lug 11, and the outermost pole lug 11 is in contact with the current collecting plate 3.

[0061] Second implementation method

[0062] As a feasible implementation method, Figure 4 and Figure 5As shown, in some use scenarios, the multiple pole ears 11 bypassed from the outside of the gasket 2 overlap with the multiple pole ears 11 bypassed from the inside of the gasket 2, and a part of the multiple pole ears 11 bypassed from the outside of the gasket 2 can be located above the pole ears 11 bypassed from the inside of the gasket 2. At this time, the top of the two parts of the pole ears 11 is an irregular shape. Therefore, in order to increase the contact area between the collector plate 3 and the pole ears 11, the collector plate 3 is combined with the pole ears 11 to form an irregular shape. Figure 4 , Figure 5 and Fig.17 As shown, the edge of the collecting plate 3 can be bent, wherein the bending area of ​​the collecting plate 3 protrudes upward, so that the bending area of ​​the collecting plate 3 can avoid the end of a portion of the pole ear 11 bypassing the outside of the gasket 2 and contact the top surface of the portion of the pole ear 11 (the outermost pole ear 11), thereby increasing the welding area.

[0063] As another feasible implementation, in some usage scenarios, the multiple pole tabs 11 bypassed from the outside of the gasket 2 overlap with the multiple pole tabs 11 bypassed from the inside of the gasket 2, and a portion of the multiple pole tabs 11 bypassed from the inside of the gasket 2 can be located above the pole tabs 11 bypassed from the outside of the gasket 2. At this time, the shape formed by the tops of the two parts of the pole tabs 11 is an irregular shape. Therefore, in order to increase the contact area between the current collecting plate 3 and the pole tabs 11, the edge of the current collecting plate 3 can be bent and arranged, wherein the edge of the current collecting plate 3 is bent downward so that the edge of the current collecting plate 3 can contact the top surface of a portion of the pole tabs 11 bypassed from the outside of the gasket 2 (the outermost pole tabs 11), thereby increasing the welding area.

[0064] It can be seen that under this design, the collector plate 3 can choose the edge bending method according to the winding state of the pole lug 11, so that the collector plate 3 and the pole lug 11 fit better during welding, reducing the phenomenon of cold welding and leaking welding, and the length design of the pole lug 11 is more flexible.

[0065] The third implementation method

[0066] In other embodiments, in combination Figure 6 and Figure 7 As shown, a plurality of tabs 11 bypass the gasket 2 from the inside and outside of the gasket 2 , and some of the tabs 11 bypassing the gasket 2 extend in a direction parallel to the plane of the gasket 2 , and the current collecting plate 3 contacts the tabs 11 at the outermost layer.

[0067] Specifically, the plurality of pole ears 11 are divided into two parts from the middle position, one part of the pole ears 11 bypasses the gasket 2 from the inner side of the gasket 2, and the other part of the pole ears 11 bypasses the gasket 2 from the outer side of the gasket 2, so that the plurality of pole ears 11 after bypassing the gasket 2 are divided into two corresponding parts, and the top surfaces of the part of the pole ears 11 located above the gasket 2 are in the same plane, and the collecting plate 3 contacts and welds with the top surfaces of the part of the pole ears 11 located above the gasket 2 to increase the welding area.

[0068] Further optimization, continue to refer to Figure 6 and Figure 7 The ends of the multiple pole lugs 11 arranged on the same side are flush or uneven. This design method makes the portion of the pole lugs 11 located above the gasket 2 have a larger length, thereby increasing the contact area between the outermost pole lug 11 and the current collecting plate 3, and the length of each layer of pole lugs 11 can be the same or different, as long as the portion of the pole lugs 11 is located above the gasket 2.

[0069] In other embodiments, in combination Figures 8 to 11 As shown, a plurality of pole tabs 11 bypass the gasket 2 from the inside or outside, and some of the pole tabs 11 bypassing the gasket 2 extend in a direction parallel to the plane of the gasket 2 , and the current collecting plate 3 contacts the outermost pole tabs 11 .

[0070] Fourth Implementation Method

[0071] As a feasible implementation method, Figure 8 and Fig. 9 As shown, a plurality of pole tabs 11 bypass the gasket 2 from the outside of the gasket 2, and some of the pole tabs 11 bypassing the gasket 2 extend in the horizontal direction. The current collecting plate 3 contacts the pole tabs 11 at the outermost layer, and the contact positions are welded.

[0072] Fifth Implementation Method

[0073] As another feasible implementation, combining Fig.10 and Fig.11 As shown, a plurality of pole tabs 11 bypass the gasket 2 from the inner side thereof, and some of the pole tabs 11 bypassing the gasket 2 extend in the horizontal direction. The current collecting plate 3 contacts the pole tabs 11 at the outermost layer, and the contact positions are welded.

[0074] Further optimized, the ends of the multiple pole ears 11 are flush or uneven. Among them, the ends of the multiple pole ears 11 are flush. This design method allows the portion of the pole ears 11 located above the gasket 2 to have a larger length, thereby increasing the contact area between the outermost pole ears 11 and the current collecting disk 3, and the length of each layer of pole ears 11 is the same to increase the contact area between the two adjacent layers of pole ears 11. In addition, the ends of the multiple pole ears 11 may not be flush, but the ends of the outermost pole ears 11 are flush. This design method allows the outermost pole ears 11 to have a larger length, thereby increasing the contact area between the outermost pole ears 11 and the current collecting disk 3.

[0075] In the battery under the above-mentioned design, multiple pole tabs 11 bypass the gasket 2 from the inner and outer sides of the gasket 2 or any single side of the gasket 2 to extend to the top of the gasket 2, thereby minimizing the length of the unwelded pole tab 11 area, improving the utilization rate of the pole tab 11, improving the uniformity of current distribution, and effectively improving the fast charging capability of the battery. The current collecting plate 3 and the pole tab 11 are welded on the gasket 2 to prevent the metal particles generated during welding from sliding into the core 1 or scalding the core 1 diaphragm. Specifically, the battery under this design can effectively prevent the metal particles generated during the welding process of the pole tab 11 from sliding into the battery cell along the gap of the pole tab 11. On the other hand, it can effectively prevent the high defective rate of the product and potential safety risks caused by the scalding of the diaphragm due to the welding of the pole tab 11.

[0076] In some embodiments, in combination Fig.13 , Fig.15 and Fig.18 As shown, the current collecting plate 3 is of sheet structure, and the gasket 2 is of annular structure. The current collecting plate 3 of sheet structure can increase the connection area, and the annular gasket 2 facilitates the pole ear 11 to bypass the pole ear 11 from the inner side of the gasket 2 .

[0077] It can be understood that when the current collecting disk 3 is used as a positive current collecting disk and connected to the pole 5, in order to ensure the connection effect, the current collecting disk 3 is set to a disc shape. When the current collecting disk 3 is used as a negative current collecting disk, the current collecting disk 3 can be set to a disc shape or a ring shape.

[0078] It is understandable that when multiple tabs 11 bypass the inner and outer sides of the gasket 2, the gasket 2 needs to be set into a ring structure. When multiple tabs 11 bypass only the outer side of the gasket 2, the gasket 2 can be set into a disc or ring shape.

[0079] It can be seen that the design of the collecting plate 3 and the gasket 2 of the present application is not limited and can be selected according to actual needs.

[0080] The gasket 2 of the present application is made of insulating material or non-insulating material. It can be seen that the material of the gasket 2 of the present application is not limited and can be designed according to actual needs.

[0081] It is understandable that the Figure 2 , Figure 4 , Figure 6 , Figure 8 as well as Fig.10 Both illustrate the positive electrode part of the secondary battery, but do not illustrate the negative electrode part of the secondary battery. The difference is that the positive electrode current collector needs to be connected to the pole, so the current collector 3 is a disc structure, but the negative electrode current collector can be annular or disc-shaped.

[0082] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0083] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A secondary battery, characterized in that: The invention comprises a core (1) having a pole ear (11), a gasket (2) and a current collecting plate (3), wherein the gasket (2) is arranged between the core (1) and the current collecting plate (3), the pole ear (11) bypasses the gasket (2) so that the end of the pole ear (11) is located on the side of the gasket (2) facing away from the core (1), and the current collecting plate (3) and the pole ear (11) are welded and connected on the side of the gasket (2) facing away from the core (1).

2. The secondary battery according to claim 1, characterized in that: The gasket (2) adopts an annular structure, and the pole ears (11) are multiple, and the multiple pole ears (11) can bypass the gasket (2) from the inside and / or outside of the gasket (2).

3. The secondary battery according to claim 2, characterized in that: An annular protrusion (21) is provided on one side of the gasket (2) facing the core (1).

4. The secondary battery according to claim 2, characterized in that: The plurality of pole ears (11) bypass the gasket (2) from the inner side and the outer side of the gasket (2), and the ends of the plurality of pole ears (11) form a groove, and a protrusion (31) is provided on the side of the collecting plate (3) at a position corresponding to the groove.

5. The secondary battery according to claim 2, characterized in that: The plurality of pole lugs (11) bypass the gasket (2) from the inner side and the outer side of the gasket (2), and a portion of the pole lugs (11) on one side can be located above the plurality of pole lugs (11) on the other side, and the edge of the current collecting plate (3) is bent so that the current collecting plate (3) can contact the pole lugs (11) on the outermost layer.

6. The secondary battery according to claim 2, characterized in that: The plurality of pole lugs (11) bypass the gasket (2) from the inner side and the outer side of the gasket (2), and the portion of the pole lugs (11) bypassing the gasket (2) extends in a direction parallel to the plane in which the gasket (2) is located, and the current collecting plate (3) is in contact with the pole lugs (11) at the outermost layer.

7. The secondary battery according to claim 6, characterized in that: The ends of the plurality of pole ears (11) arranged on the same side are flush or uneven.

8. The secondary battery according to claim 2, characterized in that: The plurality of pole lugs (11) bypass the gasket (2) from the inner side or the outer side of the gasket (2), and the portion of the pole lugs (11) bypassing the gasket (2) extends in a direction parallel to the plane in which the gasket (2) is located, and the current collecting plate (3) is in contact with the pole lugs (11) at the outermost layer.

9. The secondary battery according to claim 8, characterized in that: The ends of the plurality of pole ears (11) are flush or uneven.

10. The secondary battery according to any one of claims 1 to 9, characterized in that: The gasket (2) is made of insulating material or non-insulating material.

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