Collecting plate, connecting structure and cylindrical battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a collector plate, a connecting structure and a cylindrical battery. The collector plate is located between the pole and the pole roll and comprises a plate body and a convex hull, the plate body is connected to a tab on the pole roll in a welded mode, the convex hull is arranged on the plate body in a protruding mode in the direction towards the pole, the convex hull is in a step shape and comprises a base portion and a welding portion, the sectional areas of the base portion and the welding portion are sequentially reduced, a welding hole is formed in the pole in a penetrating mode, and the welding portion is inserted into the welding hole in a limited mode. And the outer side wall of the welding part is fixedly connected to the inner side wall of the welding hole in a welding manner. Other positions on the pole are welded with the convex hull, so that the condition that the pole is instably welded with the convex hull when the thickness size of the upset bottom of the pole is not uniform can be avoided, the problems of poor welding, insufficient welding and sealing-off of the pole and the collector plate in the prior art are solved, and the welding yield and the welding quality of the pole and the collector plate are effectively improved; and meanwhile, the thickness precision of the upsetting bottom of the pole does not need to be controlled, so that the production pressure is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a current collector, a connection structure, and a cylindrical battery. Background Technology

[0002] In the battery assembly process, after the electrode rolls are inserted into the battery casing and welded to the current collector, the current collector also needs to be welded to the terminal post. The welding quality between the cylindrical battery terminal post and the current collector has a significant impact on the subsequent manufacturing process of the cylindrical battery.

[0003] However, in cylindrical batteries, the terminals are usually formed by integral pressing, and the existing forming process will result in uneven thickness of the welding area at the bottom of the terminal pressing, which leads to unstable welding quality between the terminal and the current collector, and is prone to poor welding, cold welding, and desoldering.

[0004] Based on the above, there is an urgent need for a current collector, a connection structure, and a cylindrical battery to solve the problems existing in the prior art. Utility Model Content

[0005] The first objective of this invention is to provide a current collector that can increase the welding yield and improve the welding quality between the electrode post and the current collector.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A current collector, located between the electrode post and the electrode roll, includes a disk body and a bulge. The disk body is welded to the electrode lug on the electrode roll. Along the direction towards the electrode post, the bulge protrudes from the disk body. The bulge is stepped and includes a base and a welding part with successively decreasing cross-sectional area. A welding hole is opened through the electrode post. The welding part is inserted into the welding hole and the outer side wall of the welding part is fixed to the inner side wall of the welding hole by welding.

[0008] Preferably, the stepped connecting surface between the base and the welded part is fitted against the bottom of the pole post.

[0009] Preferably, the length of the welded portion in the vertical direction is in the range of 0.3-0.7 mm.

[0010] Preferably, the length of the welded part in the horizontal direction is in the range of 3-4 mm.

[0011] Preferably, the horizontal cross-sectional shape of the welded portion and the welded hole is circular.

[0012] Preferably, the bulge is formed by integral stamping of the disc body; and / or, the bulge is formed by integral stamping of the base and the welded portion.

[0013] Preferably, the upper surface of the welded part is provided with cross-shaped grooves.

[0014] The first objective of this utility model is to provide a collection connection structure. By using the aforementioned collector plate, the welding connection strength between the pole post and the collector plate can be improved, eliminating the risk of unstable welding quality between the pole post and the bulge due to uneven thickness at the bottom of the pole post, thereby improving production quality.

[0015] To achieve this objective, the present invention adopts the following technical solution:

[0016] The connection structure includes a battery cover and the aforementioned current collector plate. The current collector plate is welded to the tabs on the electrode roll. The battery cover plate is fitted and covered on the current collector plate. The battery cover plate includes a terminal post, which is welded to the current collector plate.

[0017] Preferably, the battery cover further includes a cover body and an upper plastic. The cover body has a terminal hole for the terminal to pass through, and an annular groove is provided around the terminal hole. The upper plastic is attached to the upper surface of the cover body and has an annular protrusion that is inserted into the annular groove.

[0018] The third objective of this invention is to provide a cylindrical battery that, by using the aforementioned connection structure, enhances the production efficiency and safety of the cylindrical battery during use.

[0019] To achieve this objective, the present invention adopts the following technical solution:

[0020] A cylindrical battery includes a battery casing, an electrode roll, and the aforementioned connecting structure. The battery casing is a hollow cylindrical structure. The electrode roll and the connecting structure are both housed within the battery casing. The connecting structure is connected to a tab on the electrode roll.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a collector plate in which a welding part is protruding from the convex bulge, and a welding hole is opened in the groove of the pole. After the welding part is inserted into the welding hole, the outer wall of the welding part and the inner wall of the welding hole are welded together. By welding to the convex bulge at other positions on the pole, the unstable welding situation when the thickness of the bottom of the pole is uneven can be avoided. This solves the problems of poor welding, false welding, and detachment between the pole and the collector plate in the prior art, effectively increasing the welding yield and welding quality between the two. At the same time, it is no longer necessary to control the thickness accuracy of the bottom of the pole, which greatly reduces the production pressure.

[0023] This utility model also provides a connection structure, which includes a battery cover and the aforementioned current collector. The battery cover is fitted onto the current collector and includes a terminal post with a welding hole. The welding part in the current collector is inserted into the welding hole, and the outer wall of the welding part is welded to the inner wall of the welding hole. This significantly improves the welding connection strength between the terminal post and the current collector, eliminating the risk of unstable welding quality between the terminal post and the bulge due to uneven thickness at the bottom of the terminal post. This effectively improves the production quality of the connection structure.

[0024] This utility model also provides a cylindrical battery, which includes a battery casing, electrode rolls, and the aforementioned connection structure. Because the cylindrical battery includes the aforementioned connection structure, and the welding strength between the electrode and the current collector in the connection structure is effectively improved, loosening between the electrode and the current collector is avoided. This improves the manufacturing efficiency of the connection structure, thereby significantly enhancing the production efficiency and safety of the cylindrical battery during use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the connection structure provided by this utility model;

[0026] Figure 2 An exploded view of the connection structure provided by this utility model;

[0027] Figure 3 This is a cross-sectional view of the connection structure provided by this utility model;

[0028] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0029] Figure 5 This is an exploded view of the battery cover provided by this utility model.

[0030] In the picture:

[0031] 1. Connection structure;

[0032] 11. Battery cover; 111. Terminal post; 1111. Groove; 1112. Welding hole; 111. 3-positioning ring; 1114. Riveted flange; 112. Cover body; 1121. Terminal post hole; 1122. Annular groove; 113. Upper plastic; 1131. Annular protrusion; 114. Lower plastic; 115. Sealing ring;

[0033] 12. Collector plate; 121. Plate body; 122. Convex bulge; 1221. Base; 1222. Welded part; 1223. Stepped connection surface. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

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

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] In the prior art, cylindrical batteries generally include a battery casing, electrode rolls, and a connecting structure. The battery casing is a hollow cylindrical structure. The electrode rolls are housed within the battery casing and are generally formed by winding electrode sheets. The electrode sheets include a positive electrode sheet, a negative electrode sheet, and a separator sheet, with the separator sheet sandwiched between the positive and negative electrode sheets. The electrode sheets generally have a coating area and a blank area, and the tabs are fixedly mounted on the blank area by welding. The connecting structure includes a battery cover plate 11 and a current collector plate 12. The current collector plate 12 and the battery cover plate 11 are stacked sequentially at the opening of the battery casing to seal the electrode rolls. The current collector plate 12 is welded to the tabs on the electrode rolls. The battery cover plate 11 includes a terminal post 111, which is welded to the current collector plate 12, allowing the current on the electrode rolls to be transferred to the terminal post 111 through the current collector plate 12.

[0039] Furthermore, in the prior art, the current collector 12 includes a disk body 121 and a protrusion 122. The horizontal cross-sectional shape of the disk body 121, the battery cover plate 11, and the battery casing are all circular. The disk body 121 is welded to the electrode lug on the electrode roll. The protrusion 122 can be formed on the disk body 121 by integral stamping, which helps to improve the efficiency and accuracy of the protrusion 122 processing. In this embodiment, the electrode post 111 is integrally formed by pressing, and a groove 1111 is recessed downward on the surface of the electrode post 111, such as... Figure 4 As shown, a welding area is formed at the bottom of the tank 1111. This welding area needs to be closely connected to the top of the protrusion 122 to ensure the quality of the weld. However, due to the existing process, the thickness of the welding area at the bottom of the pole post 111 is uneven, resulting in an uneven welding area. This leads to unstable welding quality between the pole post 111 and the collector plate 12, making it prone to poor welding, incomplete welding, and detachment, and also making welding difficult.

[0040] Figure 1 This is a schematic diagram of the connection structure 1 of a cylindrical battery provided in an embodiment of the present invention. Figure 2 This is an exploded view of the connection structure 1 of a cylindrical battery provided in an embodiment of the present invention. Figure 3 This is a cross-sectional view of a connection structure 1 for a cylindrical battery provided in an embodiment of the present invention. Figure 4 For the image Figure 3 A magnified view of a portion of point A in the middle. Figure 5 This is an exploded view of the battery cover plate 11 of the connection structure 1 provided in this embodiment of the present utility model.

[0041] Combination Figure 1 , Figure 2 and Figure 4As shown, in the manifold 12 provided in this embodiment, the convex bulge 122 is stepped and includes a base 1221 and a welding part 1222 with the cross-sectional area decreasing sequentially. The bottom of the groove 1111 of the pole post 111 is provided with a welding hole 1112. After the welding part 1222 is inserted into the welding hole 1112, the operator can fix the outer wall of the welding part 1222 and the inner wall of the welding hole 1112 by laser welding.

[0042] The convex 122 provided in this embodiment has a protruding welding part 1222, and a welding hole 1112 is opened in the groove 1111 of the pole post 111. After the welding part 1222 is inserted into the welding hole 1112, the outer side wall of the welding part 1222 and the inner side wall of the welding hole 1112 are welded together. By welding the pole post 111 to the convex 122 at other positions on the pole post 111, the unstable welding of the pole post 111 to the convex 122 when the thickness of the bottom of the pole post 111 is uneven can be avoided. This solves the problems of poor welding, false welding and detachment between the pole post 111 and the collector plate 12 in the prior art, effectively increasing the welding yield and welding quality between the two. At the same time, it is no longer necessary to control the thickness accuracy of the bottom of the pole post 111, which greatly reduces the production pressure.

[0043] Furthermore, the vertical length h of the welding part 1222 ranges from 0.3 to 0.7 mm. For example, h can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm. It should be noted that if h is less than 0.3 mm, the contact area between the welding part 1222 and the welding hole 1112 will be too small, resulting in a small welding surface, which is detrimental to a stable connection between the two. If h is greater than 0.7 mm, the welding efficiency between the welding part 1222 and the pole post 111 will decrease, and effective welding between the two will be hindered. For example, in this embodiment, the vertical length h of the welding part 1222 is 0.5 mm.

[0044] Furthermore, the horizontal length 'a' of the welded part 1222 ranges from 3 to 4 mm. For example, 'a' can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, or 4 mm. It should be noted that if 'a' is less than 3 mm, the horizontal cross-sectional dimension of the welded part 1222 will be too small, which is detrimental to the forming of the welded part 1222 and its welding with the pole post 111, increasing the welding difficulty for workers. If 'h' is greater than 4 mm, it will increase the welding time and welding material costs to some extent, hindering the improvement of welding efficiency. For example, in this embodiment, the horizontal length 'a' of the welded part 1222 is 3.7 mm.

[0045] Furthermore, in this embodiment, the horizontal cross-sectional shape of both the welded part 1222 and the welded hole 1112 is circular. The circular cross-section is relatively simple, which facilitates the processing and manufacturing of the welded part 1222 and the welded hole 1112. Moreover, the circular cross-section can make the connection between the welded part 1222 and the welded hole 1112 more sealed and compact, so that the welded hole 1112 can better fuse with the welded part 1222 to form a uniform weld, thereby effectively improving the sealing performance.

[0046] In this embodiment, the base 1221 and the welding part 1222 are also formed on the disc body 121 by integral stamping, so as to accurately control the length of the welding part 1222 in the horizontal and vertical directions, so that the welding requirements of the pole post 111 and the welding part 1222 can be met under the characteristic conditions.

[0047] Optionally, in this embodiment, the upper surface of the welded portion 1222 is provided with a cross-shaped notch (not shown in the figure). When the internal pressure of the cylindrical battery is greater than the preset pressure (for example, when excessive gas is generated due to overcharging), the cross-shaped notch can be opened more quickly, forming a tear for gas to escape. The tear can quickly release the gas generated inside the cylindrical battery, thereby relieving the internal pressure of the cylindrical battery and reducing the risk of the cylindrical battery exploding. The shape of the cross-shaped notch is not limited in this embodiment. As long as it can rupture under a certain pressure to effectively release the internal pressure of the cylindrical battery, it is within the protection scope of this utility model.

[0048] Optionally, in this embodiment, a stepped connecting surface 1223 is formed between the base 1221 and the welding part 1222. The stepped connecting surface 1223 fits against the bottom of the pole post 111 so that the outer side of the welding part 1222 and the inner side of the welding hole 1112 can fit together to the maximum extent, thereby improving the welding safety and reliability and welding quality between the pole post 111 and the collector plate 12. It can also improve the installation stability of the collector plate 12 during welding and avoid the risk of the collector plate 12 tilting or deflecting to the left or right.

[0049] This embodiment also provides a connection structure 1, which includes a battery cover plate 11 and the aforementioned current collector plate 12. The battery cover plate 11 is fitted onto the current collector plate 12. The battery cover plate 11 includes a terminal post 111, which is welded to a welding portion 1222 on the current collector plate 12. The plate body 121 of the current collector plate 12 is welded to a tab on the electrode roll of the cylindrical battery. Because the connection structure 1 includes the aforementioned current collector plate 12, the welding connection strength between the terminal post 111 and the current collector plate 12 is significantly improved. This eliminates the risk of unstable welding quality between the terminal post 111 and the protrusion 122 due to uneven thickness at the bottom of the terminal post 111, effectively improving the production quality of the connection structure 1.

[0050] Combination Figure 3 and Figure 5 As shown, the battery cover 11 provided in this embodiment also includes a cover body 112, an upper plastic 113, a lower plastic 114, and a sealing ring 115. The cover body 112 has a terminal hole 1121, through which the terminal 111 can be fixed to the cover body 112. Specifically, one end of the terminal 111 forms a limiting ring. During assembly, the terminal 111 first passes through the terminal hole 1131 on the cover body 112 from the inside out until the limiting ring abuts against the inner wall of the cover body 112. Then, a riveting operation is performed on the end of the terminal 111 extending out of the cover body 112 to form a riveting flange 1114, thus fixing the terminal 111 to the cover body 112. Furthermore, the pole post 111 is insulated from the cover plate body 112. The inner and outer sides of the cover plate body 112 are respectively provided with a lower plastic 114 and an upper plastic 113. Both the lower plastic 114 and the upper plastic 113 can be molded from insulating materials such as rubber. The lower plastic 114 is sandwiched between the limiting ring and the inner wall of the cover plate body 112, and the upper plastic 113 is sandwiched between the riveted flange 1114 and the outer wall of the cover plate body 112. A sealing ring 115 is fitted onto the pole post 111 so that the sealing ring 115 can fill the space between the outer peripheral wall of the pole post 111 and the inner peripheral wall of the hole in the pole post 111, thereby achieving complete sealing and insulation between the pole post 111 and the cover plate body 112.

[0051] Furthermore, in this embodiment, an annular groove 1122 is provided on the cover plate body 112 around the hole of the pole post 111, and the bottom of the upper plastic 113 has an annular protrusion 1131. The annular protrusion 1131 is inserted into the annular groove 1122 to limit the upper plastic 113, thereby enhancing the thrust and torque of the pole post 111.

[0052] This embodiment also provides a cylindrical battery, which includes a battery casing, electrode rolls, and the aforementioned connection structure 1. Because the cylindrical battery includes the aforementioned connection structure 1, and the welding strength between the electrode post 111 and the current collector 12 in the connection structure 1 is effectively improved, loosening between the electrode post 111 and the current collector 12 is avoided. This improves the manufacturing efficiency of the connection structure 1, thereby significantly enhancing the production efficiency and safety of the cylindrical battery during use.

[0053] It should be noted that cylindrical batteries can be classified into single-tab, multi-tab, and full-tab structures based on the different settings of the tabs on the electrode roll. This utility model does not limit the type of cylindrical battery. When the connecting structure 1 in the cylindrical battery is used for a multi-tab cylindrical battery or a full-tab cylindrical battery, some or all of the tabs can be selected and extended to the disk body 121 of the current collector 12 after being rolled up, and then welded to the disk body 121 according to actual needs.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A current collector plate between a pole (111) and a pole roll, characterized in that The current collecting plate (12) comprises a plate body (121) and a convex bump (122), the plate body (121) is welded to the tab on the pole roll, the convex bump (122) is arranged on the plate body (121) in the direction towards the pole column (111), the convex bump (122) is in a stepped shape and comprises a base (1221) and a welding part (1222) with gradually decreasing cross-sectional areas, the pole column (111) is provided with a welding hole (1112) penetrating through, the welding part (1222) is limitingly inserted into the welding hole (1112), and the outer side wall of the welding part (1222) is fixedly connected to the inner side wall of the welding hole (1112) by welding.

2. The current plate of claim 1, wherein The stepped connecting surface (1223) between the base (1221) and the welding part (1222) is abutted to the bottom of the pole column (111).

3. The current plate of claim 1, wherein The length of the welding part (1222) in the vertical direction ranges from 0.3 to 0.7 mm.

4. The current plate of claim 1, wherein, The length of the welding part (1222) in the horizontal direction ranges from 3 to 4 mm.

5. The current plate of claim 1, wherein, The horizontal cross-sectional shape of the welding part (1222) and the welding hole (1112) is circular.

6. The current plate of claim 1, wherein, The plate body (121) forms the convex bump (122) by integral stamping; and / or, the convex bump (122) forms the base (1221) and the welding part (1222) by integral stamping.

7. The current plate of claim 1, wherein The upper surface of the welding part (1222) is provided with cross-shaped notches.

8. A connection structure characterized by The connecting structure (1) comprises a battery cover plate (11) and the current collecting plate (12) according to any one of claims 1-7, the current collecting plate (12) is welded to the tab on the pole roll, the battery cover plate (11) is abutted and covers the current collecting plate (12), and the battery cover plate (11) comprises a pole column (111) welded to the current collecting plate (12).

9. The connection structure according to claim 8, characterized in that The battery cover plate (11) further comprises a cover plate body (112) and an upper plastic (113), the cover plate body (112) is provided with a pole column hole (1121) for the pole column (111) to pass through, and the cover plate body (112) is provided with an annular groove (1122) around the pole column hole (1121), the upper plastic (113) is abutted and arranged on the upper surface of the cover plate body (112), and the upper plastic (113) is provided with an annular protrusion (1131) limitingly inserted into the annular groove (1122).

10. A cylindrical battery characterized by The cylindrical battery comprises a battery shell, a pole roll and the connecting structure (1) according to any one of claims 8-9, the battery shell is in a hollow cylindrical structure, the pole roll and the connecting structure (1) are accommodated in the battery shell, and the connecting structure (1) is connected to the tab on the pole roll.

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