CN217740742U

CN217740742U - Novel converging sheet structure of full-lug cylindrical lithium ion battery

Info

Publication number: CN217740742U
Application number: CN202221438091.3U
Authority: CN
Inventors: 刘国庆; 蒋亚东; 刘素娟; 高卫涛; 洪树
Original assignee: Tianjin Lishen Battery JSCL
Current assignee: Tianjin Lishen Battery JSCL
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-11-04
Anticipated expiration: 2032-06-10

Abstract

The utility model discloses a novel piece structure that converges of full utmost point ear cylinder lithium ion battery. The utility model is provided with six evenly distributed fan-shaped areas and central holes, and each fan-shaped area and the central hole are formed by mechanical punch; each sector area is respectively and fixedly and electrically connected with a current collector, a T-shaped elastic sheet is arranged between every two adjacent sector areas, and adjacent elastic sheets are separated or connected; the elastic sheet is connected with the shell by ultrasonic welding, resistance welding, laser welding, friction welding and the like, and the sector area is communicated with the shell through the T-shaped elastic sheet. The utility model discloses can solve and lead to the confluence piece to be connected inefficacy with the mass flow body electricity because of vibrations reason in the use of utmost point group to serious problem generates heat when arousing power battery heavy current and discharges, also can provide the multiple assembly form of confluence piece and casing simultaneously.

Description

Novel converging sheet structure of full-lug cylindrical lithium ion battery

Technical Field

The utility model relates to a lithium ion battery production field, it is specific relates to a novel conflux piece structure of full utmost point ear cylinder lithium ion battery.

Background

The lithium ion battery is not only applied to the fields of mobile communication, electric power energy storage and 3C, but also applied to the fields of electric tools and traffic power. With the rapid penetration of lithium ion batteries in the fields of electric automobiles and electric bicycles, the trend of electric motorization is clear, and therefore, among all kinds of lithium ion batteries, power batteries are concerned about due to large current, small heat generation and strong power.

The full tab (no tab) gradually becomes the mainstream of the assembly mode of the large cylindrical power battery, the tab is connected with the shell or the pole through the bus sheet, however, the vibration working condition proportion of the power battery is relatively high in the use process, and the condition that the electrode group is welded with the bus sheet due to vibration exists, so that the power of the battery is weakened, the heat productivity is increased, and safety accidents can be caused in serious cases. Therefore, the structure of the confluence piece is the key for stable connection of the three.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, a novel confluence piece structure of full utmost point ear cylinder lithium ion battery is provided.

The utility model discloses a novel confluence piece structure of a full-lug cylindrical lithium ion battery, wherein six evenly distributed fan-shaped areas and a central hole are arranged on a confluence piece, and each fan-shaped area and the central hole are formed by mechanical punch forming; each sector area is fixedly and electrically connected with a current collector, a T-shaped elastic sheet is arranged between every two adjacent sector areas, and adjacent elastic sheets are isolated or connected; the elastic sheet is connected with the shell by ultrasonic welding, resistance welding, laser welding, friction welding and the like, and the sector area is communicated with the shell through the T-shaped elastic sheet.

The utility model discloses the structure can be solved and extremely lead to the confluence piece to be connected inefficacy with the mass flow body electricity because of vibrations reason in the use to arouse the serious problem of generating heat when power battery heavy current discharges, also can provide the multiple assembly form of confluence piece and casing simultaneously.

A preparation method of a novel circular lithium ion battery structure comprises the following steps:

firstly, centering and aligning a converging sheet Z with the surface A1 of the pole group A through a circumferential positioning hole Z0;

secondly, laser welding is carried out on the surface A1 and the welding area Z1 of the confluence sheet Z by using laser welding equipment to obtain a component 1;

and thirdly, welding a confluence plate Z welding area Z2 in the component 1 with the X end surface X1 of the pole to obtain the component 2, wherein the welding mode is one of ultrasonic welding, resistance welding, laser welding, friction welding and the like.

Fourthly, positioning and pressing the confluence sheet B and the surface A2 of the pole group A in the component 2 through a central hole;

step five, laser welding equipment is used for carrying out laser welding on the welding area B1 of the pole group A and the bus plate B in the previous step to obtain a component 3;

sixthly, assembling the component 3 obtained in the last step with a shell C;

welding the converging sheet B in the second step with a T-shaped elastic sheet B2 and the inner wall C1 of the shell C through welding equipment to obtain a component 4;

step eight, injecting, forming and exhausting the component 4;

and step nine, welding the side edge D1 of the cover plate D with the outer wall C2 of the shell C in the component 4 through laser welding equipment to finish sealing.

The utility model discloses following beneficial effect has:

1) The shape of the bus bar is centrosymmetric, and the current distribution condition is uniform.

2) The bus bar is suitable for various circular multi-lug and full-lug (no-lug) processes.

3) The bus bar can be integrally formed by punching, and has simple manufacturing process and low cost.

4) The cylindrical battery adopting the bus bar piece structure has stronger anti-seismic performance, and the risk of welding failure under the vibration working condition is reduced.

Drawings

Fig. 1 is a top view of a positive current collecting plate structure in an embodiment of the present invention;

fig. 2 is a top view of an embodiment of the present invention showing a structure of an anode current collecting plate;

fig. 3 is a front view of an expansion structure of an elastic sheet of the anode current collecting plate in the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a lithium battery applying the structure in an embodiment of the present invention;

fig. 5 is a schematic view of three electrical connection structures of the bus bar of the present invention.

Detailed Description

The following examples are given to further illustrate the present invention with reference to the accompanying drawings.

The utility model is provided with six evenly distributed fan-shaped areas and central holes, and each fan-shaped area and the central hole are formed by mechanical punch; each sector area is fixedly and electrically connected with a current collector, a T-shaped elastic sheet is arranged between every two adjacent sector areas, and adjacent elastic sheets are separated or connected. Description of the invention: the collector plate is a collector plate.

The following supplements the difference between the positive bus bar and the negative bus bar:

as shown in figure 1, the positive bus bar is made of aluminum and is formed by mechanical stamping, wherein the thickness of the positive bus bar is 0.1-0.5mm, the thickness of the negative bus bar is slightly smaller than that of the positive bus bar when the positive bus bar and the negative bus bar are used in a matched manner, wherein Z1 and Z2 are welding sites of the positive bus bar, Z1 is a welding site at the A1 end of the positive bus bar and the positive bus bar, Z2 is a welding site of the positive bus bar and a positive pole, and after the welding sites of Z1 and Z2 are implemented, the pole group realizes a damping function through a fan-shaped cutting area, namely when the pole group is subjected to position deviation, the fan-shaped cutting area realizes mutual dislocation of the welding sites of Z1 and Z2 so as to achieve a damping effect, and the positive bus bar is made of aluminum and is made of aluminum through mechanical stamping

The pole confluence sheet is provided with a positioning hole for positioning and welding the tool, so that the confluence sheet is prevented from deviating during welding.

The negative bus bar is made of a copper nickel-plated material and is formed by mechanical stamping, wherein the thickness of the negative bus bar is 0.1-0.5mm, when the positive and negative bus bars are matched for use, the thickness of the negative return bar is smaller than that of the positive return bar, which is related to the fact that the positive and negative return bars are made of different materials, the negative return bars directly influence laser welding parameters, and the thickness of the positive and negative bus bars is closely related to the welding effect, wherein B1 and B2 are welding sites of the negative bus bar, B1 is a welding site of the negative bus bar and the end face of the flattened end A2 of the negative bus bar, B2 is a welding site of the negative bus bar and a shell, a welding site is not arranged in the central area of the negative bus bar, when the welding sites B1 and B2 are simultaneously implemented, a damping function is realized by a cutting area between a sector area and a T-shaped elastic sheet, namely, when the pole group is impacted by external force, the sector-shaped cutting area between the welding sites of the B1 and the B2 is free of a connection point, stress buffering space is larger, and further the damping effect is achieved, and when the welding sites of the pole group are simultaneously implemented, the pole group is impacted by external force, the U-shaped elastic sheet, the buffer distance between the T-shaped elastic sheet and the T-shaped elastic sheet is displayed in figure 3, and the T-shaped elastic sheet is displayed, and the buffer distance between the adjacent two adjacent T-shaped elastic sheets is between the T-shaped elastic sheet B1 and the T-shaped elastic sheet is between the positioning hole.

A method for preparing a novel round lithium ion battery structure, as shown in fig. 1-5, comprises the following steps:

firstly, centering and aligning a welding position of a confluence sheet Z and the surface A1 of a pole group A through a circumferential positioning hole Z0;

secondly, laser welding is carried out on the surface A1 and a welding area Z1 of the confluence sheet Z by using laser welding equipment to obtain a component 1;

Fourthly, positioning and pressing the converging piece B and the surface A2 of the pole group A in the component 2 through a central hole;

sixthly, assembling the component 3 obtained in the last step with a shell C;

welding the converging sheet B2 and the inner wall C1 of the shell C by welding equipment to obtain a component 4;

step eight, injecting, forming and exhausting the component 4;

Example one

A circular lithium ion battery structure combination indication applying a novel bus bar comprises the following steps:

after the full-lug winding forming pole group A is kneaded, a positive pole converging sheet Z is used for being pressed with the end of a positive pole kneading flat end A1, laser welding is adopted, a certain number of points are uniformly welded in a petal area through pulse spot welding, the converging sheet Z and a pole X are welded through the center hole of the pole group A through a welding needle at the bottom, the welding method is resistance welding, and the combination sequence is as shown in a schematic diagram of fig. 4. The diameter of the confluence sheet is slightly smaller than the inner diameter of the steel shell, so that the confluence sheet can conveniently enter the shell and is insulated, and the pole X and the steel shell C are fixed and combined by an insulating part, a sealing part and a riveting component simultaneously.

And welding the negative pole confluence sheet B with the negative pole flattening end A2 at the side of the pole group A, and adopting a preset welding parameter in the same way as the welding of the positive pole A1 side with the positive pole confluence sheet Z. The elastic sheet C1 of the negative bus bar B and the steel shell C are welded in a laser continuous line mode, the steel shell C and the end cover D are welded in the same welding mode, and meanwhile the sealing effect is guaranteed. As shown in fig. 5, in some embodiments, the negative end cap adopts a concave structure design, and is fusion welded with the contact area of the bus bar spring plate in the concave structure; in some embodiments, the open end surface of the shell C adopts a roller groove structure, the end cover D adopts a combined sealing assembly, and the elastic sheets B2 can be selectively welded on two sides of the groove position.

Claims

1. A novel confluence piece structure of a full-lug cylindrical lithium ion battery is characterized in that a confluence piece consists of a positive pole confluence piece and a negative pole return piece, each confluence piece is provided with six uniformly distributed fan-shaped areas and a central hole, and each fan-shaped area and the central hole are formed by mechanical punch forming; each sector area is respectively and fixedly and electrically connected with a current collector, a T-shaped elastic sheet is arranged between every two adjacent sector areas, and adjacent elastic sheets are separated or connected.

2. The novel bus bar structure of the full-lug cylindrical lithium ion battery as claimed in claim 1, wherein the spring plate is connected with the housing or the pole by ultrasonic welding, resistance welding, laser welding or friction welding.

3. The novel bus bar structure of the full-lug cylindrical lithium ion battery of claim 1, wherein each sector area is respectively connected with the housing or the pole through a T-shaped spring.