CN221328048U - Electric connection piece and electric core - Google Patents

Abstract

The utility model discloses an electric connection sheet and an electric core, wherein the electric connection sheet is used for being electrically connected with a current collector of the electric core, the electric connection sheet comprises a structural member body, one end of the structural member body, which is used for being electrically connected with the current collector, is a first end, the first end is provided with a first through hole penetrating up and down, the structural member body is provided with a first welding area and a second welding area along the length direction, the first welding area and the second welding area are respectively positioned at two sides of the first through hole, and the first welding area and the second welding area are used for being welded and connected with the current collector. The electric connecting piece is through setting up first via hole on the structure body to with first welded zone and second welded zone setting in the both sides of via hole, the mass flow of electric core can be welded at first welded zone and second welded zone respectively with the electric connecting piece, realizes twice main welding, even when the main position of welding of a department goes wrong, still has a main welding can charge and discharge safely, avoids appearing separating lithium because of the welded zone structure fracture, thereby improves welding strength and reliability.

Description

Electric connection piece and electric core

Technical Field

The utility model relates to an electric connection sheet and an electric core.

Background

Currently, with the development of new energy industries, lithium ion batteries are widely used. The lithium ion battery production plant usually adopts ultrasonic welding or laser welding to connect structural members, wherein the ultrasonic welding is used for welding and connecting the electric connection sheet with a current collector on the battery cell by utilizing ultrasonic vibration.

Ultrasonic welding utilizes ultrasonic vibration to plastically connect the electric connecting sheet and the current collector so as to realize the functions of heat conduction and electric conduction. The ultrasonic welding needs to input proper amplitude, energy and pressure parameters to realize proper welding tension, so that the problems of cold joint, overselding, welding mark cracking and the like are avoided. In addition, the horn and the mount of ultrasonic welding may be worn out with use, degrading the penetration ability of the weld, and even causing cold joint. At present, the lithium ion battery is welded by adopting primary main welding, when the primary main welding has a problem, the performance of the battery core is attenuated, and when the primary main welding is serious, lithium is separated from the battery core, and even safety accidents are caused.

Disclosure of utility model

The utility model aims to overcome the defect of poor welding quality of a current collector and an electric connecting sheet of an electric core in the prior art, and provides the electric connecting sheet and the electric core.

The utility model solves the technical problems by the following technical scheme:

The utility model provides an electric connection piece, its mass flow body electricity that is used for with electric core is connected, the electric connection piece includes the structure body, the structure body be used for with the one end that the mass flow body electricity is connected is first end, first end has the first via hole that runs through from top to bottom, the structure body is equipped with first welded zone and second welded zone along length direction, first welded zone with the second welded zone is located respectively the both sides of first via hole, first welded zone with the second welded zone be used for with mass flow body welded connection.

In this scheme, this electric connection piece is through setting up first via hole on the structure body to with first welded zone and second welded zone setting in the both sides of via hole, the mass flow of electric core can be welded at first welded zone and second welded zone respectively with the electric connection piece, realizes twice main welding, even when the main position of welding of a department goes wrong, still one main welding can carry out charge and discharge safely, avoids appearing separating lithium because of the welded zone structural fracture to improve welding strength and reliability, reduced the security risk that current electric connection piece leads to because of once main welding goes wrong, thereby improve electric core security and reliability.

Preferably, the first via hole is a rectangular hole, and a width range of the rectangular hole along the length direction is greater than or equal to 1 and less than or equal to 2mm.

In this scheme, set up the convenient processing of rectangular hole, rectangular hole's width scope is more than or equal to 1 and less than or equal to 2mm, the size matching with flat collector of being convenient for.

Preferably, the length of the rectangular hole is not less than the width of the current collector.

In the scheme, the structure is adopted, so that the current collector is smaller than the width of the electric connecting sheet, and electric connection is facilitated.

Preferably, the rectangular hole has a length greater than the width of the current collector by a difference ranging from 3mm or more to 5mm or less.

In this scheme, adopt above-mentioned structure setting, improve assembly accuracy.

Preferably, the thickness of the first welding zone and/or the thickness of the second welding zone is smaller than the thickness of the structural member body.

In this scheme, adopt above-mentioned structure setting, be convenient for structure body and the welding of mass flow body, the surface after also being convenient for guarantee structure body and the welding of mass flow body is leveled simultaneously.

Preferably, the thickness of the first welding area and/or the thickness of the second welding area is in a range of 0.05mm or more and 0.1mm or less.

In this scheme, adopt above-mentioned structure setting to simplify the structure of structure body, guarantee the intensity of structure body simultaneously.

Preferably, the width of the first welding area along the length direction and/or the width of the second welding area along the length direction is greater than or equal to 1mm and less than or equal to 3mm.

In this scheme, adopt above-mentioned structure setting for guarantee sufficient welding area, after the welding is accomplished, make have sufficient joint strength and overcurrent area between the electric connection piece and the current collector.

Preferably, the structural member body is further provided with a protection sheet, two ends of the protection sheet are connected to edges of the first welding area to form a second via hole, the first welding area is arranged on the inner wall of the second via hole, and the second via hole is used for the current collector to penetrate through.

In the scheme, the protection sheet and the structural member body form a second through hole, the current collector penetrates through the second through hole to form a fixing effect on the current collector, meanwhile, the protection sheet is arranged on the current collector, and when in welding, the protection sheet can protect the first-layer foil.

Preferably, the protective sheet is further used for welding connection with the current collector.

In the scheme, the structure is adopted, so that the current collector and the electric connecting sheet have enough connection strength, and overload is avoided when current flows.

Preferably, the first end of the electric connection sheet is further provided with a protective sleeve, and the protective sleeve is used for protecting a welding area between the electric connection sheet and the current collector.

In this scheme, adopt above-mentioned structure setting, be used for protecting the welding position through setting up the protective sheath, prevent that the welded zone from being destroyed, improve the reliability.

Preferably, the protective sleeve is made of rubber.

In this scheme, rubber material's protective sheath has elasticity, can establish through the cover and install on the welded zone after the welding, forms protection architecture, also is convenient for utilize elasticity simultaneously to dismantle.

The battery cell comprises the electric connecting sheet, the shell and the winding core, wherein the winding core is arranged in the shell, a current collector is formed on the winding core, and the current collector is respectively connected with the first welding area and the second welding area of the electric connecting sheet in a welding mode.

In this scheme, the electric current collector of this electric core can weld with the first welded area and the second welded area of electric connection piece simultaneously, realizes twice main welding, even when the main position of welding of a department goes wrong, still has a main welding can charge and discharge safely, avoids appearing separating lithium because of the welded area fracture to improve welding strength and reliability, reduced the present electric connection piece because of the main safety risk that leads to that the problem appears that welds once, thereby improve electric core security and reliability.

On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.

The utility model has the positive progress effects that: this electric connection piece is through setting up first via hole on the structure body to with first welded zone and second welded zone setting in the both sides of via hole, the mass flow of electric core can be welded at first welded zone and second welded zone respectively with the electric connection piece, realizes twice main welding, even when the main position of welding of a department goes wrong, still one main welding can carry out charge and discharge safely, avoids appearing separating lithium because of welded zone structural fracture to improve welding strength and reliability, reduced the present electric connection piece because of the main safe risk that leads to that the problem appears that welds once, thereby improve electric core security and reliability.

Drawings

Fig. 1 is a schematic structural view of an electrical connection sheet according to a preferred embodiment of the present utility model.

Fig. 2 is an exploded view of the current collector and the electrical connection pad according to a preferred embodiment of the present utility model.

Fig. 3 is a schematic structural view of an electrical connection pad welded on a current collector of a battery cell according to a preferred embodiment of the present utility model.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Reference numerals illustrate:

Shell 1

Current collector 11

Structural member body 2

First end 21

First via 211

First bonding region 212

Second bonding region 213

Protective sheet 214

Second via 215

Protective sleeve 22

Lengthwise direction 100

Detailed Description

The utility model will now be more fully described by way of example only and with reference to the accompanying drawings, but the utility model is not thereby limited to the scope of the examples described.

As shown in fig. 1-4, this embodiment discloses an electrical connection piece, which is used for being electrically connected with a current collector 11 of an electrical core, and the electrical connection piece includes a structural member body 2, wherein one end of the structural member body 2, which is used for being electrically connected with the current collector 11, is a first end 21, the first end 21 is provided with a first through hole 211 penetrating up and down, the structural member body 2 is provided with a first welding area 212 and a second welding area 213 along the length direction 100, the first welding area 212 and the second welding area 213 are respectively located at two sides of the first through hole 211, and the first welding area 212 and the second welding area 213 are used for being welded and connected with the current collector 11.

As shown in fig. 1 to fig. 4, in this embodiment, by disposing the first via hole 211 on the structural member body 2 and disposing the first welding area 212 and the second welding area 213 on two sides of the via hole, the current collector 11 of the electric core and the electric connecting sheet can be welded respectively at the first welding area 212 and the second welding area 213, so as to implement two main welds, and even if a problem occurs at a main welding position, still another main weld can safely perform charging and discharging, thereby avoiding lithium precipitation caused by structural fracture of the welding area, improving welding strength and reliability, and reducing safety risk caused by a problem occurring in one main weld of the existing electric connecting sheet, so as to improve safety and reliability of the electric core.

As shown in fig. 1 and 4, the first via hole 211 is a rectangular hole, and the width of the rectangular hole along the length direction 100 ranges from 1 to 2mm. The rectangular holes are convenient to process, and the width range of the rectangular holes is more than or equal to 1 and less than or equal to 2mm, so that the rectangular holes are convenient to match with the size of the flat current collector 11.

As shown in fig. 1 and 4, the length of the rectangular hole is not smaller than the width of the current collector 11, so that the width of the current collector 11 is smaller than the width of the electric connection sheet, thereby facilitating electric connection.

As shown in fig. 4, the difference range of the length of the rectangular hole to the width of the current collector 11 is 3mm or more and 5mm or less, so that the current collector 11 is positioned within the rectangular hole when passing through the rectangular hole, to improve the assembly accuracy.

In an embodiment, the thickness of the first welding area 212 or the thickness of the second welding area 213 is smaller than the thickness of the structural member body 2, so that the structural member body 2 and the current collector 11 are welded conveniently, and the surface of the structural member body 2 and the current collector 11 after being welded is smooth.

In another embodiment, the thickness of the first welding area 212 and the thickness of the second welding area 213 are smaller than the thickness of the structural member body 2, so that the structural member body 2 and the current collector 11 are welded, and the surface of the structural member body 2 and the current collector 11 after being welded is smooth.

In an embodiment, the thickness of the first welding area 212 or the thickness of the second welding area 213 ranges from 0.05mm or more to 0.1mm or less, so as to simplify the structure of the structural member body 2 and ensure the strength of the structural member body 2.

In another embodiment, the thickness of the first welding area 212 and the thickness of the second welding area 213 range from 0.05mm or more to 0.1mm or less to simplify the structure of the structural member body 2 while securing the strength of the structural member body 2.

In an embodiment, the width of the first welding area 212 along the length direction 100 or the width of the second welding area 213 along the length direction 100 ranges from 1mm to 3mm, so as to ensure a sufficient welding area, and after the welding is completed, the electric connection piece and the current collector 11 have sufficient connection strength and an overcurrent area.

In another embodiment, the width of the first welding area 212 and the width of the second welding area 213 are in the range of 1mm or more and 3mm or less to ensure a sufficient welding area, and after the welding is completed, the electric connection piece and the current collector 11 have sufficient connection strength and an overcurrent area.

As shown in fig. 1 and 4, the structural member body 2 is further provided with a protection sheet 214, two ends of the protection sheet 214 are connected to edges of the first welding area 212 to form a second via hole 215, the first welding area 212 is disposed on an inner wall of the second via hole 215, and the second via hole 215 is used for penetrating the current collector 11. The protection sheet 214 forms a second through hole 215 with the structural member body 2, the current collector 11 is arranged in the second through hole 215 in a penetrating mode, a fixing effect is achieved on the current collector 11, meanwhile, the protection sheet 214 is arranged on the current collector 11, and the protection sheet 214 can protect a first layer of foil material during welding.

The protective sheet 214 is also used for welding connection with the current collector 11, so that the current collector 11 and the electric connection sheet have enough connection strength, and the current is not overloaded when flowing.

As shown in fig. 1-4, the first end 21 of the electrical connection pad is further provided with a protective sleeve 22, the protective sleeve 22 being used to protect the welding zone between the electrical connection pad and the current collector 11. By providing the protective sleeve 22 for protecting the welding position, the welding area is prevented from being damaged, and the reliability is improved.

The protective sleeve 22 is made of rubber. The rubber protective sleeve 22 has elasticity, can be installed on the welding area through the cover after welding, forms protection architecture, is convenient for also utilize elasticity to dismantle simultaneously.

The electric connection sheet is also called Tab structure, which is a structure formed by copper sheet or aluminum sheet and seleant glue and used for connecting the winding body of the battery cell.

The embodiment also discloses a battery cell, which comprises the electric connection sheet, the shell 1 and the winding core, wherein the winding core is arranged in the shell 1, the winding core is provided with the current collector 11, and the current collector 11 is respectively connected with the first welding area 212 and the second welding area 213 of the electric connection sheet in a welding way. The current collector 11 of this electric core can weld simultaneously with the first welding zone 212 and the second welding zone 213 of electric connection piece, realizes twice main welding, even when the main position of welding of a department goes wrong, still has a main welding to weld and can charge and discharge safely, avoids appearing separating lithium because of the welded zone fracture to improve welding strength and reliability, reduced the present electric connection piece because of the main safety risk that leads to that the problem appears of welding once, thereby improve electric core security and reliability.

In the description herein, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. The utility model provides an electric connection piece, its is used for being connected with the mass flow body electricity of electric core, its characterized in that, electric connection piece includes the structure body, the structure body be used for with the one end that the mass flow body electricity is connected is first end, first end has the first via hole that runs through from top to bottom, the structure body is equipped with first welded zone and second welded zone along length direction, first welded zone with the second welded zone is located respectively the both sides of first via hole, first welded zone with the second welded zone be used for with mass flow body welded connection.

2. The electrical connection pad of claim 1, wherein the first via is a rectangular hole having a width in the length direction ranging from 1 to 2mm.

3. The electrical connection pad of claim 2, wherein the rectangular aperture has a length that is not less than the width of the current collector.

4. An electrical connection sheet according to claim 3, wherein the rectangular hole has a length greater than the width of the current collector by a difference in the range of 3mm or more and 5mm or less.

5. An electrical connection pad according to claim 1, wherein the thickness of the first bonding pad and/or the thickness of the second bonding pad is less than the thickness of the structural member body.

6. The electrical connection pad of claim 5, wherein the thickness of the first bonding pad and/or the thickness of the second bonding pad ranges from 0.05mm or more to 0.1mm or less.

7. The electrical connection pad of claim 5, wherein a width of the first bonding pad along the length direction and/or a width of the second bonding pad along the length direction ranges from 1mm or more to 3mm or less.

8. The electrical connection pad of claim 1, wherein the structural member body is further provided with a protective sheet, two ends of the protective sheet are connected to edges of the first welding area to form a second via, the first welding area is disposed on an inner wall of the second via, and the second via is used for penetrating the current collector.

9. The electrical connection pad of claim 8, wherein said protective pad is further adapted for welded connection with said current collector.

10. An electrical core, comprising a housing, a winding core and an electrical connection pad according to any one of claims 1-8, wherein the winding core is mounted inside the housing, and a current collector is formed on the winding core and is welded to the first welding area and the second welding area of the electrical connection pad, respectively.