Battery negative electrode current collector and battery

Abstract

The utility model relates to a battery technical field, concretely relates to a battery negative electrode current collecting disc and battery. The utility model provides a battery negative electrode current collecting disc, including current collecting disc main part, current collecting disc main part includes: main part department, the main part department is provided with the negative electrode connecting portion fixed connection with negative pole post; current collecting piece, current collecting piece is connected with main part department, and multiple current collecting pieces surround the circumference array arrangement of main part department, and current collecting piece is provided with the buffer groove of openwork, and current collecting piece is still provided with the roll core connecting portion fixed connection with negative pole lug, and the roll core connecting portion is located in the region of the buffer groove of current collecting piece towards main part department, and current collecting piece is concave along the direction of the roll core towards main part department relatively. The utility model is stable in structure, and the anti -deformation ability is strong, and the connection is reliable.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery negative electrode current collector and a battery. Background Technology

[0002] The energy storage industry is developing rapidly, and lithium-ion batteries are widely used in daily life and production. This also places higher demands on the consistency, size specifications, and structural reliability of battery cells. Large-diameter cylindrical lithium-ion batteries, with their unique cell structure design, high energy density, and excellent structural safety, have gained widespread attention.

[0003] Among the many components of a cylindrical battery, the negative electrode current collector gathers the current. It needs to connect the tab at the negative end of the core to the external circuit of the negative electrode post to form a current loop. In these assembly and connection processes, a variety of welding processes are usually involved, generally laser penetration welding and other fusion welding.

[0004] To ensure effective penetration depth, laser penetration welding requires high power, which can cause thermal stress deformation of the negative electrode current collector, affecting welding reliability, manufacturing stability, and product consistency. Furthermore, during cell use, the current collector can also be subjected to stress and deformation due to cell charging and discharging heat, electrode expansion, or core vibration displacement, affecting the connection stability between the current collector and the core. Utility Model Content

[0005] In view of the technical problems in the existing technology where the connection stability between the negative electrode current collector and the core is affected during the assembly process of laser penetration welding and during the use of the battery cell, this utility model provides a battery negative electrode current collector and battery, which has a stable structure, strong resistance to deformation, and reliable connection.

[0006] This utility model provides a battery negative electrode current collector, including a current collector body. The current collector body includes: a main body portion, which is provided with a negative electrode connection portion fixedly connected to the negative electrode post; current collector plates, which are connected to the main body portion, and multiple current collector plates are arranged in a circumferential array around the main body portion. The current collector plates are provided with hollowed-out buffer grooves, and the current collector plates are also provided with core connection portions fixedly connected to the negative electrode tabs. The core connection portions are located in the area of ​​the current collector plate where the buffer grooves face the main body portion, and the current collector plates are recessed relative to the main body portion in the direction towards the core.

[0007] Furthermore, the buffer groove is arc-shaped.

[0008] Furthermore, the buffer groove is centered on the main body of the collector plate, and the groove span is 80°.

[0009] Furthermore, the negative electrode post and the negative electrode connection part are fixedly connected by laser penetration welding, and the welding line trajectory of the penetration welding is a multi-layer equidistant ripple shape.

[0010] Furthermore, the negative electrode tab and the core connection are fixedly connected by laser penetration welding, and the welding line trajectory of the penetration welding is a radial straight line.

[0011] Furthermore, the portion of the main body located between two adjacent collector plates is provided with a through hole.

[0012] Furthermore, a rounded corner transition is provided at the step where the collector plate connects to the main body.

[0013] Furthermore, the outer edge of the main body located between two adjacent collector plates has rounded corners at the connection point between the collector plates and the outer edge.

[0014] Furthermore, the current collector is fan-shaped, and there are three current collectors.

[0015] This utility model provides a battery, including the aforementioned battery negative electrode current collector, and also includes a negative electrode post, which is connected to the main body by through-welding; it also includes an electrode tab, which is connected to the core connection part by through-welding.

[0016] The beneficial effects of this utility model are as follows: This invention is designed based on the structural features of the negative electrode current collector, providing a stress release channel and improving the current collector's resistance to stress deformation.

[0017] The buffer groove design can release the stress generated inside or on the surface of the current collector plate due to welding heat or battery vibration. Multiple individual current collector plates and evenly distributed hollow buffer grooves enhance the ability of the current collector plate body to release internal stress, improve the deformation of the current collector plate during the welding process between the current collector plate and the battery core, and improve welding stability and cell assembly efficiency.

[0018] Through holes can be used for assembly positioning, improving production efficiency.

[0019] The raised sections in the central area of ​​the current collector plate and the connection area of ​​the three current collector plates effectively connect the three current collector plates, ensuring the integrity of the main body and increasing the strength of the current collector plate. The current collector plates are recessed relative to other parts of the current collector plate body, ensuring full contact between the bottom surface of the current collector plate and the core electrode lugs, preventing incomplete soldering. The raised sections in the central area of ​​the current collector plate body and the current collector plate connection area, relative to the current collector plates, increase the overall rigidity of the current collector plate through their undulating structure. The stepped raised design and hollowed-out buffer grooves in the current collector plate body and current collector plates accelerate the wetting speed of the electrolyte within the core.

[0020] The connection between the current collector body, the negative electrode post, and the core is achieved through automated laser penetration welding, with a rationally and scientifically designed weld line trajectory. Specifically, the weld line at the core connection is a radial straight line. Due to the design of the hollowed-out buffer groove, the thermal stress generated inside the current collector due to this welding process can be fully released. Furthermore, the hollowed-out structure design of the current collector increases the elasticity of the current collector body, ensuring the stability of the welded connection and product consistency when the electrode sheets expand during battery charging and discharging, or when external vibrations apply stress to the current collector. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 Top view of the manifold of this utility model Figure 1 A schematic diagram of the structure of one embodiment; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 for Figure 3 Enlarged view of section B in the middle.

[0023] Explanation of main reference numerals: 1-Collector main body; 2-Collector plate; 3-Buffer groove; 4-Main body; 5-Core connecting part; 6-Through hole. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] like Figure 1-2As shown, one embodiment of this utility model provides a battery negative electrode current collector, including a current collector body 1. The current collector body 1 includes a main body portion 4 and current collector plates 2. The current collector plates 2 are connected to the main body portion 4. Multiple current collector plates 2 are arranged in a circumferential array around the main body portion 4. The current collector plates 2 are provided with hollowed-out buffer grooves 3. The current collector plates 2 are also provided with core connecting portions 5 that are fixedly connected to the negative electrode tabs. The core connecting portions 5 are located in the area of ​​the current collector plate 2 facing the main body portion 4 from the buffer grooves 3. The current collector plate 2 is recessed relative to the main body portion 4 in the direction towards the core. The main body portion 4 is provided with a negative electrode connecting portion that is fixedly connected to the negative electrode post. The portion of the main body portion 4 between two adjacent current collector plates 2 is provided with a through hole 6. The buffer groove 3 is an arc-shaped buffer groove 3 that penetrates the current collector body 1. The hollowed-out buffer groove 3 is used to release the stress inside the current collector plates 2 and alleviate the deformation of the current collector. The stress and deformation mainly suppressed come from the thermal stress generated during the welding process between the current collector body 1 and the core. Therefore, it can improve the cell assembly efficiency and ensure the consistency of the produced products. When the battery is subjected to vibration, impact, or thermal expansion and contraction during assembly or use, the current collector plate will generate stress. At this time, the hollowed-out buffer groove 3 can first undergo slight elastic deformation to absorb and disperse these stresses, forming a buffer zone, effectively preventing the stress from being directly transmitted to the welding point of the fragile battery core connection part 5. The connecting protrusion area of ​​the current collector plate 2 and the main body part 4 and the through hole 6 also work together to enhance the overall rigidity and provide additional stress relief points, thereby ensuring the long-term stability and reliability of the welded connection between the electrode tab and the current collector plate. In a preferred embodiment, the buffer groove 3 is centered on the center of the current collector plate body 1, and the groove opening spans 80°.

[0026] The protrusions in the central area of ​​the collector plate body 1 and the connecting area of ​​the three collector plates 2 effectively connect the three collector plates 2, ensuring the integrity of the body and increasing the strength of the collector plate. The collector plates 2 are recessed relative to other parts of the collector plate body 1, ensuring full contact between the bottom surface of the collector plate and the core electrode lugs, preventing incomplete soldering. The central area of ​​the collector plate body 1 and the connecting area of ​​the collector plates 2 protrude relative to the collector plates 2, and this undulating structure increases the overall rigidity of the collector plate. The stepped protrusions and hollowed-out buffer grooves 3 of the collector plate body 1 and the collector plates 2 accelerate the wetting speed of the electrolyte within the core.

[0027] The negative electrode post and the negative electrode connection are fixedly connected by laser penetration welding, and the weld line trajectory of the penetration weld is a multi-layered equidistant ripple shape. The negative electrode tab and the core connection part 5 are fixedly connected by laser penetration welding, and the weld line trajectory of the penetration weld is a radial straight line. This welding method has a high CPK (CPK is the process capability index), ensuring the reliability of the connection between the current collector and the core tabs. The weld line of the core connection part 5 is a radial straight line. Due to the design of the hollow buffer groove 3, the thermal stress generated inside the current collector due to this welding can be fully released. The hollow structure design of the current collector increases the elasticity of the current collector body 1, ensuring the stability of the welded connection and product consistency when the electrode sheet expands during battery charging and discharging, or when external vibrations apply stress to the current collector.

[0028] like Figure 2 , Figure 3 , Figure 4 As shown, in a preferred embodiment, the collector plate 2 is fan-shaped, and there are three collector plates 2. A rounded corner transition is provided at the step where the collector plate 2 connects to the main body 4. The outer edge of the portion of the main body 4 located between two adjacent collector plates 2 has rounded corners at the connection point.

[0029] One embodiment of this utility model provides a battery, which further includes a negative electrode post, which is connected to the main body 4 by through-welding, and the weld line trajectory of the through-welding is a multi-layer equidistant ripple shape; it also includes an electrode tab, which is connected to the core connection part 5 by through-welding, and the weld line trajectory of the through-welding is a radial straight line.

[0030] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A battery negative electrode current collector, comprising a current collector body, characterized in that, The main body of the collector panel includes: The main body is provided with a negative electrode connection part that is fixedly connected to the negative electrode post; The current collector is connected to the main body. Multiple current collectors are arranged in a circular array around the main body. The current collector is provided with a hollowed-out buffer groove. The current collector is also provided with a core connecting part that is fixedly connected to the negative electrode tab. The core connecting part is located in the area of ​​the current collector's buffer groove facing the main body. The current collector is concave relative to the main body in the direction towards the core.

2. The battery negative electrode current collector as described in claim 1, characterized in that, The buffer groove is arc-shaped.

3. A battery negative electrode current collector as described in claim 2, characterized in that, The buffer trough is centered on the main body of the collector plate, and the trough span is 80°.

4. A battery negative electrode current collector as described in claim 1, characterized in that, The negative electrode post and the negative electrode connection part are fixedly connected by laser penetration welding. The weld line trajectory of the penetration welding is a multi-layer equidistant ripple shape.

5. A battery negative electrode current collector as described in claim 1, characterized in that, The negative electrode tab and the core connection are fixedly connected by laser penetration welding, and the welding line trajectory of the penetration welding is a radial straight line.

6. A battery negative electrode current collector as described in claim 1, characterized in that, The main body section located between two adjacent collector plates has a through hole.

7. A battery negative electrode current collector as described in claim 1, characterized in that, The step where the collector plate connects to the main body is rounded for transition.

8. A battery negative electrode current collector as described in claim 1, characterized in that, The outer edge of the main body located between two adjacent collector plates has rounded corners.

9. A battery negative electrode current collector as described in claim 1, characterized in that, The current collector is fan-shaped, and there are three current collectors.

10. A battery, characterized in that, The battery negative electrode current collector includes a negative electrode post as described in any one of claims 1-9, and is connected to the main body by through-welding; it also includes a tab, which is connected to the core connection part by through-welding.

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