Roll core tab welding structure and battery core

Abstract

The utility model provides a roll core tab welding structure and a battery cell, and belongs to the technical field of new energy batteries. The roll core tab welding structure comprises a welding plate and at least one single core bag, a pole column is arranged on one side face of the welding plate, a positioning protrusion is arranged on the other side face of the welding plate, a turnover part is arranged at the top of the positioning protrusion, a tab is arranged on the single core bag in an extending mode, a mounting hole is formed in the tab, and the tab is arranged on the positioning protrusion in a sleeving mode through the mounting hole. And the folding part is folded towards the welding plate and is propped against the tab, so that the tab is fixed on the welding plate. By adopting the roll core tab welding structure and the battery core, the generation of welding slag can be reduced and avoided by optimizing the connecting and assembling mode between the tab and the battery core pole, and the safety of the battery core is improved.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a core electrode tab welding structure and a battery cell. Background Art

[0002] Lithium-ion batteries, as one of the mainstream energy storage devices, are widely used in new energy vehicles, various portable electronic devices, and communication equipment. With the continuous progress in the field of lithium-ion batteries, especially the explosive development of the new energy vehicle industry, people have put forward higher requirements for the overall lifespan of lithium-ion batteries in order to ensure driving range.

[0003] In related technologies, lithium-ion batteries typically employ multiple cells stacked to form a module, which is then housed within a battery casing to operate together. A single cell usually includes a cover plate, a housing, and an internal winding core. A tab extends from the top of the internal winding core. As a crucial component of the cell, the tab connects the internal winding core electrode sheet to the external terminal post, serving as a vital bridge for current transmission. The tab is typically welded to the terminal post on the cover plate via connecting tabs.

[0004] For traditional battery cells in related technologies, when the tabs are welded to the terminals via connecting pieces, the processing involves at least welding the tabs to the connecting pieces and welding the connecting pieces to the terminals. This welding process involves many steps and is prone to producing residual welding slag, which can lead to short circuits in the battery cells and cause safety accidents. Utility Model Content

[0005] This utility model provides a core-type electrode tab welding structure and a battery cell, which can reduce and avoid the generation of welding slag and improve the safety of the battery cell by optimizing the connection and assembly method between the electrode tab and the battery cell terminal. The technical solution is as follows:

[0006] In a first aspect, this utility model provides a core electrode lug welding structure, including a welding plate and at least one single core package. One side of the welding plate is provided with an electrode post, and the other side of the welding plate is provided with a positioning protrusion. The top of the positioning protrusion is provided with a folded portion. An electrode lug extends out of the single core package and is provided with an installation hole. The electrode lug is sleeved on the positioning protrusion through the installation hole. The folded portion folds towards the welding plate and abuts against the electrode lug to fix the electrode lug to the welding plate.

[0007] Optionally, the positioning protrusion is an annular protrusion, and the mounting hole is a circular hole that matches the annular protrusion.

[0008] Optionally, the sidewall of the positioning protrusion is provided with an axially extending folded slit, the folded slit is connected to the top of the positioning protrusion, and the segment of the positioning protrusion between two adjacent folded slits forms the folded portion.

[0009] Optionally, multiple folding seams are provided and are arranged at equal angular intervals along the circumference of the positioning protrusion.

[0010] Optionally, the thickness of the folded portion ranges from 0.1 to 0.3 mm.

[0011] Optionally, the positioning protrusion is a copper structural component or an aluminum structural component.

[0012] Secondly, this utility model embodiment also provides a battery cell, including the core electrode tab welding structure as described in the first aspect above, and also including a cover plate, wherein the electrode post is embedded and installed on the cover plate.

[0013] Optionally, it also includes an insulating plastic component disposed on the cover plate. The insulating plastic component has a snap-fit ​​groove on the side near the single core package. The pole is inserted into the insulating plastic component, and the welding plate is fixedly snapped into the snap-fit ​​groove.

[0014] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0015] The core tab welding structure provided in this embodiment of the invention differs from the traditional assembly method where the core pack tabs are welded to the cover plate core via connecting pieces. Instead, it utilizes a welding plate structure connected to the terminal post. A positioning protrusion is provided on the side of the welding plate away from the terminal post, which engages with the circular mounting holes on the individual core pack tabs for through-hole connection. After the positioning protrusion passes through the mounting holes on multiple stacked tabs, the top of the positioning protrusion is folded outwards towards the welding plate to physically clamp and position the tabs of the multiple individual core packs. This achieves a fixed current-passing connection between the welding plate and the terminal post, eliminating the need for welding connecting pieces or requiring only simple welding of the folded portion to the connected tabs to complete the overall assembly. This eliminates or significantly reduces welding steps, minimizes and avoids welding slag generation, and improves the safety of the battery cell. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of a battery cell provided in an embodiment of the present utility model;

[0018] Figure 2This is a cross-sectional view of the core electrode lug welding structure provided in this embodiment of the utility model;

[0019] Figure 3 yes Figure 2 A schematic diagram of the solidified structure of the central positioning protrusion;

[0020] Figure 4 yes Figure 2 Cross-sectional view of the structure after the folding of the upper folding part of the central positioning protrusion;

[0021] Figure 5 This is a partial top view of the welding plate provided in an embodiment of the present invention.

[0022] In the diagram: 1-Welding plate; 2-Single core package; 3-Cover plate; 4-Insulating plastic part; 11-Pole post; 12-Positioning protrusion; 21-Pole lug; 41-Snap-fit ​​groove; 121-Folding part; 122-Folding seam; 211-Mounting hole. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a partial structural schematic diagram of a battery cell provided in an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the core electrode lug welding structure provided in this embodiment of the utility model; Figure 3 yes Figure 2 A schematic diagram of the solidified structure of the central positioning protrusion; Figure 4 yes Figure 2 Cross-sectional view of the structure after the folding of the upper folding part of the central positioning protrusion; Figure 5 This is a partial top view of the welding plate provided in an embodiment of the present invention.

[0025] like Figures 1 to 5 As shown, this embodiment of the utility model provides a core electrode lug welding structure, including a welding plate 1 and at least one single core package 2. One side of the welding plate 1 is provided with an electrode post 11, and the other side of the welding plate 1 is provided with a positioning protrusion 12. The top of the positioning protrusion 12 is provided with a folded portion 121. An electrode lug 21 extends from the single core package 2, and an mounting hole 211 is provided on the electrode lug 21. The electrode lug 21 is fitted onto the positioning protrusion 12 through the mounting hole 211. The folded portion 121 folds towards the welding plate 1 and abuts against the electrode lug 21 to fix the electrode lug 21 onto the welding plate 1.

[0026] In this embodiment of the invention, the core electrode welding structure includes a welding plate 1 for connecting to the top cover plate of the battery cell and two individual core packages 2. The two individual core packages 2 are arranged in parallel using electrodes and are connected to the terminals 11 on the welding plate 1 for overcurrent connection to improve the overall capacity of the assembled battery cell. During assembly, the two individual core packages 2 that need to be welded in parallel are arranged opposite each other on their electrode outlet sides, with two electrodes 21 spaced apart on their respective electrode outlet sides, corresponding to the positive and negative terminals of the battery cell. Two terminals 11 are also spaced apart on one side of the welding plate, while on the other side, two positioning protrusions 12 are respectively provided at corresponding positions of the two terminals 11. In this embodiment of the invention, the positioning protrusions 12 are generally annular protrusions with a certain thickness, and the electrodes 21 of the individual core packages 2 are provided with circular mounting holes 211 with a diameter matching the outer diameter of the annular protrusion. By aligning the circular mounting hole 211 with the positioning protrusion 12, the same-pole tabs of the two individual core packages 2 are sequentially stacked on the positioning protrusion 12. After the top of the positioning protrusion 12 completely passes through the two tabs 21, the folded part 121 located at the top of the positioning protrusion 12 is folded outward radially, that is, folded outward toward the welding plate 1, so that the folded part 121 abuts against the tab 21 located on the upper layer, so as to clamp and fix the tabs of the two individual core packages 2 between the folded part 121 and the welding plate 1, thus completing the assembly.

[0027] Compared with the traditional assembly method of welding the core package tabs to the cover plate cell via connecting pieces, the spiral core tab welding structure provided by this utility model embodiment uses a welding plate 1 structure connected to the pole post 11. A positioning protrusion 12 is provided on the side of the welding plate 1 away from the pole post 11. It is used to connect with the circular mounting holes 211 on the tabs 21 of the individual core package 2. After the positioning protrusion 12 passes through the mounting holes 211 on the multiple stacked tabs 21, the tabs 21 of the multiple individual core packages 2 are positioned by physically abutting and clamping the folded part 121 located on the top of the positioning protrusion 12 towards the welding plate 1. The welding plate 1 and the pole post 11 are fixed and connected for overcurrent. There is no need to weld the connecting pieces, or only a simple welding of the folded part 121 to the connected tabs 21 is required to complete the overall assembly. This eliminates or greatly reduces the welding processing steps, reduces and avoids the generation of welding slag, and improves the safety of the cell.

[0028] Optionally, a folding slit 122 extending axially is provided on the side wall of the positioning protrusion 12. The folding slit 122 communicates with the top of the positioning protrusion 12, and the segment of the positioning protrusion 12 between two adjacent folding slits 122 forms a folded portion 121. Exemplarily, in this embodiment of the present invention, by providing a folding slit 122 longitudinally on the top of the annular positioning protrusion 12, and by connecting the folding slit 122 with the top end face to form a notch for folding, a separate folded portion 121 is defined between two adjacent folding slits 122. This design facilitates the manual pressing and folding of the folded portion 121 by workers or by using relevant equipment after the electrode tab 21 has been inserted and positioned, so as to achieve uniform and accurate fixing of the electrode tab 21.

[0029] Optionally, multiple folding seams 122 are provided and arranged at equal angular intervals along the circumference of the positioning protrusion 12. For example, in this embodiment of the invention, three folding seams 122 may be provided at equal angles, with an included angle of 120° between adjacent folding seams 122. In other possible implementations, the number of folding seams 122 may also be two, four, or more; this embodiment of the invention does not limit this.

[0030] For example, in this embodiment of the present invention, the thickness of the folding part 121, that is, the annular positioning protrusion 12, is set to be 0.1 to 0.3 mm, and can be made of aluminum or copper depending on the corresponding positive and negative poles.

[0031] refer to Figure 1 This utility model embodiment also provides a battery cell, including as follows: Figures 2 to 5 The illustrated core electrode lug welding structure also includes a cover plate 3, with the electrode post 11 embedded in the cover plate 3. Exemplarily, in this embodiment of the invention, when the core electrode lug welding structure is assembled within a complete battery cell, it is connected to the cover plate 3, which serves as the battery cell housing, via a welding plate 1. The electrode post 11 is fixedly embedded on one side of the cover plate 3 and protrudes from the other side, serving as a connection end to external copper busbars or other current-carrying components. Afterwards, by bending the two individual core packages 2 towards each other at 90°, they can be placed together into the corresponding battery cell housing and sealed by the cover plate 3 to complete the installation. The structure is simple and easy to assemble.

[0032] Optionally, it also includes an insulating plastic component 4, which is disposed on the cover plate 3. The insulating plastic component 4 has a snap-fit ​​groove 41 on the side near the individual core package 2. The electrode post 11 passes through the insulating plastic component 4, and the welding plate 1 is fixedly snapped into the snap-fit ​​groove 41. Exemplarily, in this embodiment of the present invention, by providing the insulating plastic component 4 on the side of the cover plate 3 near the individual core package 2, after the battery cell is formed by closing the cover, the insulating plastic component 4 is used to isolate and support the metal from the cover plate 3 and the internal individual core package 2, preventing segmentation. At the same time, the insulating plastic component 4 can also use the snap-fit ​​groove 41 on it to pre-install and limit the welding plate 1, ensuring that the welding plate 1 and the electrode post 11 are installed and embedded in the correct position in the cover plate 3, avoiding relative shaking during subsequent use, and further improving assembly stability.

[0033] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A core electrode lug welding structure, characterized in that, include: The welding plate (1) and at least one single core package (2) are provided. One side of the welding plate (1) is provided with a pole post (11) and the other side of the welding plate (1) is provided with a positioning protrusion (12). The top of the positioning protrusion (12) is provided with a folded part (121). The single core package (2) is provided with a tab (21). The tab (21) is provided with a mounting hole (211). The tab (21) is sleeved on the positioning protrusion (12) through the mounting hole (211). The folded part (121) is folded towards the welding plate (1) and abuts against the tab (21) to fix the tab (21) on the welding plate (1).

2. The core electrode lug welding structure according to claim 1, characterized in that, The positioning protrusion (12) is an annular protrusion, and the mounting hole (211) is a circular hole that matches the annular protrusion.

3. The core electrode lug welding structure according to claim 2, characterized in that, The positioning protrusion (12) has an axially extending folded slit (122) on its side wall. The folded slit (122) is connected to the top of the positioning protrusion (12). The segment of the positioning protrusion (12) between two adjacent folded slits (122) forms the folded portion (121).

4. The core electrode lug welding structure according to claim 3, characterized in that, Multiple folding seams (122) are provided and are arranged at equal angular intervals along the circumference of the positioning protrusion (12).

5. The core electrode lug welding structure according to claim 3, characterized in that, The thickness of the folded portion (121) ranges from 0.1 to 0.3 mm.

6. The core electrode lug welding structure according to claim 1, characterized in that, The positioning protrusion (12) is a copper structural component or an aluminum structural component.

7. A battery cell comprising the core electrode tab welding structure as described in any one of claims 1 to 6, characterized in that, It also includes a cover plate (3), on which the pole post (11) is embedded.

8. The battery cell according to claim 7, characterized in that, It also includes an insulating plastic part (4), which is disposed on the cover plate (3). The insulating plastic part (4) has a snap-fit ​​groove (41) on the side near the single core package (2). The pole post (11) passes through the insulating plastic part (4), and the welding plate (1) is fixedly snapped into the snap-fit ​​groove (41).

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