Mortise-and-tenon-like connection structure for lithium ion battery

Abstract

The utility model discloses a similar tenon-and-mortise type connecting structure for lithium ion battery, which comprises a pole, a connecting piece and a pole group, the pole penetrates through a battery cover plate, the connecting piece adopts an inverted L-shaped structure, a connecting hole is formed in a horizontal section of the top of the connecting piece, a vertical section of the connecting piece is positioned on one side of the pole group, and tabs are arranged on two sides of the pole group. The pole lug wraps the vertical section of the connecting piece, the pole lug and the connecting piece are connected through a welding seam, a boss matched with the connecting hole is arranged at the bottom of the pole column, and the boss and the connecting hole are connected through a butt welding seam. The connecting piece and the pole adopt a tenon-and-mortise-like connecting structure and adopt laser welding, so that the thickness of the battery connecting structure can be reduced, and the utilization rate of the internal space of the battery is improved. Compared with a traditional stacking welding structure, the weight of the connecting piece is reduced, and the energy density of the battery can be improved. And butt seam welding is adopted, so that the welding area is easy to control, the over-current capability of the battery structural member is improved, and the battery safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery manufacturing technical field especially relates to lithium ion battery connecting structure. BACKGROUND

[0002] In recent years, lithium ion battery develops towards higher energy density, and correspondingly, lithium ion battery structure develops towards higher space utilization, light weight and stronger safety, therefore, it is necessary to develop new battery connecting structure.

[0003] The existing lithium ion battery adopts the structure that the pole post is arranged on the top, the pole post is welded with the connecting sheet, and the connecting sheet is connected with the pole group lug. However, the pole post and the connecting sheet are mostly stacked and laser welded, the connecting structure is thick and heavy, occupies the internal space structure of the battery, makes the space utilization rate lower, and the stacked structure increases the weight of the battery structure. When the pole group is connected with the connecting sheet, the conventional method adopts the butterfly welding process, the space utilization rate is low in the height direction of the battery, and the volume energy density of the battery is affected. UTILITY MODEL CONTENTS

[0004] The utility model discloses a tenon-and-mortise type connecting structure for lithium ion battery, which can reduce the thickness of the battery connecting structure, improve the internal space utilization rate of the battery, reduce the weight of the battery and improve the volume energy density of the battery.

[0005] The utility model discloses a tenon-and-mortise type connecting structure for lithium ion battery, which can reduce the thickness of the battery connecting structure, improve the internal space utilization rate of the battery, reduce the weight of the battery and improve the volume energy density of the battery.

[0006] A positioning hole is arranged on the top horizontal section of the connecting sheet, and a positioning block that is consistent with the positioning hole is arranged at the bottom of the pole post.

[0007] Full lugs are arranged on both sides of the pole group, the full lugs are wrapped on the vertical section of the connecting sheet, and the two are connected through a welding seam.

[0008] The advantages and positive effects of this invention are as follows: The connecting piece and the terminal post adopt a mortise-and-tenon joint-like connection structure and are laser welded, which can reduce the thickness of the battery connection structure and improve the utilization rate of the battery's internal space. Compared with the traditional stacked welding structure, this structure reduces the weight of the connecting piece and can improve the battery's energy density. The use of butt-seam welding makes it easy to control the welding area, which is beneficial to improving the current carrying capacity of the battery structural components and increasing battery safety. The electrode tab and the connecting piece are welded to the side of the battery, eliminating space waste in the height direction of the battery and improving the utilization rate of the battery's internal space. The width of the connecting piece is easy to set, and the electrode tab has a large current collecting area, which can improve the battery's power performance. Attached Figure Description

[0009] Fig. 1 This is an exploded structural diagram of the pole post and connecting piece of this utility model;

[0010] Fig. 2 This is a schematic diagram of the welding structure of the pole and connecting piece of this utility model;

[0011] Fig. 3 This is a schematic diagram of the structure of the connecting piece and the electrode assembly before welding.

[0012] Fig. 4 This is a schematic diagram of the structure of the connecting piece and the electrode assembly after welding.

[0013] In the diagram: 1-1, boss; 1-2, positioning block; 2, connecting piece; 2-1, connecting hole; 2-2, positioning hole; 3, battery cover; 4, electrode assembly. Detailed Implementation

[0014] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0015] Please see Figs. 1-4 A mortise and tenon type connection structure for lithium-ion batteries includes an electrode post, a connecting piece 2, and an electrode group 4 that penetrates through a battery cover plate 3. The connecting piece 2 adopts an inverted L-shaped structure, with a connecting hole 2-1 on the top horizontal section and a vertical section located on one side of the electrode group 4.

[0016] The electrode assembly 4 has tabs on both sides, which wrap around the vertical section of the connecting piece and are connected by a weld. The tabs on both sides of the electrode assembly are welded to the connecting piece on the side of the battery, eliminating wasted space in the battery's height direction and improving the utilization of internal battery space. The width of the connecting piece is easy to set, and the large current-collecting area of ​​the tabs can improve battery power performance.

[0017] A boss 1-1 that matches the connection hole is provided at the bottom of the pole post, and the boss 1-1 and the connection hole 2-1 are connected by a butt weld.

[0018] The connecting pieces and terminals employ a mortise-and-tenon-like connection structure and laser welding, which reduces the thickness of the battery connection structure and improves the utilization of internal battery space. Compared to traditional stacked welding structures, this structure reduces the weight of the connecting pieces, thereby increasing the battery's energy density. The butt-seam welding method facilitates control of the welding area, which is beneficial for improving the current-carrying capacity of battery components and enhancing battery safety.

[0019] In this embodiment, a positioning hole 2-2 is provided on the top horizontal section of the connecting piece 2, and a positioning block 1-2 that matches the positioning hole is provided at the bottom of the electrode post, which can improve the assembly efficiency and assembly accuracy of the electrode post and the connecting piece. Full tabs are provided on both sides of the electrode group 4, and the full tabs wrap around the vertical section of the connecting piece 2. The two are connected by a weld, which can improve the battery power performance.

[0020] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these all fall within the protection scope of the present invention.

Claims

1. A mortise-and-tenon type connection structure for lithium-ion batteries, comprising a terminal post, a connecting piece, and an electrode assembly penetrating the battery cover, characterized in that, The connecting piece adopts an inverted L-shaped structure, with a connecting hole on the top horizontal section and a vertical section located on one side of the electrode group. The electrode group has electrode tabs on both sides, and the electrode tabs wrap around the vertical section of the connecting piece. The two are connected by a weld. A boss that matches the connecting hole is provided at the bottom of the pole post. The boss and the connecting hole are connected by a butt weld.

2. The mortise-and-tenon type connection structure for lithium-ion batteries according to claim 1, characterized in that, A positioning hole is provided on the top horizontal section of the connecting piece, and a positioning block that matches the positioning hole is provided at the bottom of the pole post.

3. The mortise-and-tenon type connection structure for lithium-ion batteries according to claim 1, characterized in that, The electrode assembly has full-pole tabs on both sides, which wrap around the vertical section of the connecting piece, and the two are connected by a weld.

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