Cathode collector plate and battery

Abstract

The invention relates to the technical field of battery parts, in particular to a negative electrode collector plate and a battery. The invention provides a cathode confluence plate, which comprises a cathode confluence plate main body, the middle area of the cathode confluence plate main body is provided with a protruding part, the outside of the protruding part is provided with a plurality of reinforcing rib groups, the reinforcing rib groups are fixed on the cathode confluence plate main body, and the cathode confluence plate main body is also provided with a plurality of through holes penetrating through the cathode confluence plate main body. Each reinforcing rib set comprises a plurality of reinforcing ribs, the through holes are formed among the reinforcing ribs in the single reinforcing rib set, and a plurality of hollow buffer grooves are formed between the protruding parts and the reinforcing rib sets. According to the invention, the connection stability and reliability of the cathode of the cylindrical battery cell can be improved, and the damage to the welding strength caused by slight displacement of the roll core due to pole piece expansion or battery cell vibration and the like in the charging and discharging process of the battery cell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery components, and in particular to a negative electrode busbar and a battery. Background Art

[0002] With the in-depth development of the energy storage industry, cylindrical batteries have become a major pillar in the energy storage field due to their advantages such as high production efficiency, high energy density and low manufacturing cost. The difficulty in manufacturing cylindrical batteries lies in the connection of the tabs, mainly concentrated on the connection between the tab foil of the core and the outer tab. Usually the connection of the tabs is completed through a busbar, and the existing busbar structure is usually a circular plane. When the battery cell is charged and discharged or experiences external vibration, the slight displacement of the core inside the shell will pull the welding position of the busbar and the core, affecting the stability of the weld, and then affecting the electrical connection performance and safety performance of the battery cell. Summary of the invention

[0003] In view of the technical problem in the prior art that when the battery cell is charged and discharged or experiences external vibration, the winding core undergoes slight displacement inside the shell, which causes pulling on the welding position between the busbar and the winding core, affecting the stability of the weld, and further affecting the electrical connection performance and safety performance of the battery cell, the present invention provides a negative busbar and a battery, which can improve the stability and reliability of the negative connection of the cylindrical battery cell, and improve the damage to the welding strength caused by slight displacement of the winding core due to stage expansion during the charging and discharging process of the battery cell or vibration of the battery cell during transportation and use.

[0004] The present invention provides a negative electrode busbar, comprising a negative electrode busbar main body, a protruding boss is arranged in the middle area of ​​the negative electrode busbar main body, a plurality of reinforcing rib groups are arranged outside the protruding boss, the reinforcing rib group is fixed to the negative electrode busbar main body, the negative electrode busbar main body is also provided with a plurality of through holes penetrating the negative electrode busbar main body, the reinforcing rib group comprises a plurality of reinforcing ribs, the through holes are arranged between a plurality of reinforcing ribs in a single reinforcing rib group, and a plurality of hollow buffer grooves are arranged between the protruding boss and the reinforcing rib group.

[0005] Furthermore, a single reinforcing rib group includes two reinforcing ribs arranged opposite to each other, and the through hole is arranged between the two reinforcing ribs.

[0006] Furthermore, a plurality of reinforcing rib groups are evenly arranged on the negative electrode busbar body in a circle with the middle of the negative electrode busbar body as the center.

[0007] Furthermore, a connecting rib is provided between two mutually adjacent reinforcing ribs in two adjacent reinforcing rib groups.

[0008] Furthermore, the negative electrode busbar body is provided with three groups of reinforcing ribs, and the three groups of reinforcing ribs are distributed in a centrally symmetrical manner with the middle position of the negative electrode busbar body as the rotation center.

[0009] Furthermore, two reinforcing ribs in the reinforcing rib group are axially symmetrically distributed.

[0010] Furthermore, two reinforcing rib axes in the reinforcing rib group are distributed parallel to each other.

[0011] The present invention provides a battery, comprising a negative busbar, and also comprising a pole and a winding core fixedly connected to a negative busbar body, wherein the pole is fixedly connected to a protrusion, and a portion of the winding core is fixed between two oppositely arranged reinforcing ribs in a reinforcing rib group.

[0012] Furthermore, the pole is connected to the protruding portion by welding, and the pole ear of the winding core is connected to the busbar body by welding.

[0013] The beneficial effects of the present invention are: The present invention can improve the stability and reliability of the negative electrode connection of the cylindrical battery cell, improve the damage to the welding strength caused by the slight displacement of the winding core due to the expansion of the stage sheet during the charging and discharging process of the battery cell or the vibration of the battery cell during transportation and use, and improve the reliability of the connection at the welding point of the negative electrode of the battery cell during manufacturing and use. The reinforcing ribs increase the structural strength of the busbar. At the same time, the winding core is fixed between two oppositely arranged reinforcing ribs in the reinforcing rib group. The busbar has a sunken surface for placing the winding core, which will increase the interference degree in the height direction of the cylindrical battery cell in the shell, and generate a certain pressure on the position of the winding core pole ear to ensure the connection effect between the winding core and the busbar.

[0014] The design of the hollow buffer groove can accelerate the infiltration speed of the electrolyte into the core, and the hollow buffer groove increases the elastic deformation of the negative electrode after welding, increases the elastic stroke of the weld, and ensures the strength stability of the weld, thereby improving the tearing of the busbar and the core ear when the cylindrical battery cell expands internally or external vibration occurs, and improves the reliability of the connection at the negative electrode welding point of the battery cell during manufacturing and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments 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.

[0016] Figure 1 It is a schematic diagram of the structure of the negative electrode busbar in the prior art.

[0017] Figure 2 The figure is a schematic structural diagram of an embodiment of a negative electrode busbar.

[0018] Explanation of main figure marks: 1-negative busbar body, 2-raised portion, 3-reinforcement rib, 4-through hole, 5-hollow buffer groove, 6-connecting rib, 7-through hole. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the busbar structure in the prior art is usually a circular plane and is provided with a plurality of circular through holes 7 .

[0021] like Figure 2 As shown, an embodiment of the present invention provides a negative busbar, including a negative busbar body 1, a protruding protrusion 2 is provided in the middle area of ​​the negative busbar body 1, and a plurality of reinforcing ribs 3 are provided outside the protrusion 2, the reinforcing ribs 3 are fixed to the negative busbar body 1, the reinforcing ribs 3 include two reinforcing ribs 3, the two reinforcing ribs 3 are arranged oppositely to form a winding core groove for accommodating a winding core between the two reinforcing ribs 3, and the negative busbar body 1 is also provided with a plurality of through holes 4 penetrating the negative busbar body 1. The design of the reinforcing ribs 3 increases the structural strength of the busbar, and at the same time, the busbar has a sunken surface for placing a fixed winding core, which increases the interference degree in the height direction of the cylindrical battery core in the shell, generates a certain pressure on the position of the winding core pole ear to ensure the connection effect between the winding core and the busbar, and the through hole 4 is arranged between two oppositely arranged reinforcing ribs 3 in the reinforcing rib 3 group. A hollow buffer groove 5 is also provided between two oppositely arranged reinforcing ribs 3 in the group of reinforcing ribs 3. The hollow buffer groove 5 is provided in the negative electrode busbar body 1, which increases the elastic deformation of the negative electrode after welding, increases the elastic stroke of the welding point, and ensures the strength stability of the welding, thereby improving the tearing of the busbar and the winding core pole ear when the cylindrical battery cell expands internally or vibrates externally, and improving the reliability of the connection at the welding point of the negative electrode of the battery cell during manufacturing and use. In one embodiment, two mutually parallel hollow buffer grooves 5 are provided in a single group of reinforcing ribs 3, and the through hole 4 is provided between the two hollow buffer grooves 5. The provision of the hollow buffer groove 5 can also accelerate the infiltration speed of the electrolyte into the winding core.

[0022] A plurality of reinforcing ribs 3 groups are uniformly arranged on the negative electrode busbar body 1 in a circle with the middle position of the negative electrode busbar body 1 as the center. In a preferred embodiment, the negative electrode busbar body 1 is provided with three groups of reinforcing ribs 3 groups, and the three groups of reinforcing ribs 3 groups are centrally symmetrically distributed with the middle position of the negative electrode busbar body 1 as the rotation center. A connecting rib 6 is connected between two mutually adjacent reinforcing ribs 3 in two adjacent groups of reinforcing ribs 3 to enhance the overall stability of the negative electrode busbar. The two reinforcing ribs 3 in a single group of reinforcing ribs 3 are axially symmetrically distributed, and preferably, the two reinforcing ribs 3 in a single group of reinforcing ribs 3 are axially parallel to each other.

[0023] Comparing the existing technical solution with the technical solution in this embodiment, the existing technical solution (comparative example) is designed as a solution in which the busbar structure is a circular plane and the technical solution in this embodiment. In this comparative experiment, the radius of the busbar in the comparative example and the embodiment is 21mm, the radius of the through hole 4 is 1mm, the cross-section of the protrusion in the embodiment is circular and has a radius of 5mm, the reinforcing rib 3 is 0.2mm deep, and the hollow buffer groove 5 extends from the edge of the busbar to the edge of the protrusion. The welding strength before vibration of both the comparative example and the embodiment is designed to be 9.5N. After receiving the same vibration, the welding strength after vibration of the comparative example is 3.5N, and the welding strength after vibration of the embodiment is 6.5N, which is much greater than the welding strength after vibration of the prior art solution. The embodiment can improve the stability and reliability of the negative electrode connection of the cylindrical battery cell, and improve the damage to the welding strength caused by the slight displacement of the winding core due to the expansion of the stage sheet or the vibration of the battery cell during transportation and use during the charging and discharging process of the battery cell.

[0024] An embodiment of the present invention further provides a battery, including a negative busbar, a pole and a winding core, wherein the pole is fixedly connected to the protrusion 2, and the winding core is fixed between two oppositely arranged reinforcing ribs 3 in the reinforcing rib 3 group. In a preferred embodiment, the pole is fixedly connected to the protrusion 2 by laser welding, and the winding core is welded to the busbar body. When connecting, the pole is first connected to the central protrusion of the negative busbar by laser welding, and then the negative side of the winding core is closely attached to the two reinforcing ribs 3 of the single reinforcing rib 3 group, and the winding core pole ear is connected to the negative busbar by laser welding to complete the welding of the entire negative electrode.

[0025] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A negative busbar, comprising a negative busbar body, characterized in that: A protruding boss is provided in the middle area of ​​the negative electrode busbar body, and a plurality of reinforcing rib groups are provided outside the protruding boss. The reinforcing rib group is fixed to the negative electrode busbar body. The negative electrode busbar body is also provided with a plurality of through holes penetrating the negative electrode busbar body. The reinforcing rib group includes a plurality of reinforcing ribs. The through holes are provided between a plurality of reinforcing ribs in a single reinforcing rib group. A plurality of hollow buffer grooves are provided between the protruding boss and the reinforcing rib group.

2. A negative busbar as claimed in claim 1, characterized in that: A single reinforcing rib group includes two reinforcing ribs arranged opposite to each other, and a through hole is arranged between the two reinforcing ribs.

3. A negative busbar as claimed in claim 1, characterized in that: The plurality of reinforcing rib groups are evenly arranged on the negative electrode busbar body in a circle with the middle of the negative electrode busbar body as the center.

4. A negative busbar as claimed in claim 2, characterized in that: A connecting rib is provided between two mutually adjacent reinforcing ribs in two adjacent reinforcing rib groups.

5. A negative busbar as claimed in claim 3, characterized in that: The negative electrode busbar body is provided with three groups of reinforcing ribs, and the three groups of reinforcing ribs are symmetrically distributed with the middle position of the negative electrode busbar body as the rotation center.

6. A negative busbar as claimed in claim 1, characterized in that: The two stiffeners in the stiffener group are symmetrically distributed along the axis.

7. A negative busbar as claimed in claim 1, characterized in that: The two reinforcing rib axes in the reinforcing rib group are distributed parallel to each other.

8. A battery, characterized in that: It comprises the negative busbar as described in any one of claims 1-7, and also comprises a pole and a winding core fixedly connected to the negative busbar body, the pole is fixedly connected to the protrusion, and part of the winding core is fixed between two oppositely arranged reinforcing ribs in the reinforcing rib group.

9. A battery as claimed in claim 8, characterized in that: The pole is connected to the protruding portion by welding, and the pole ear of the winding core is connected to the busbar body by welding.

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