WO2022242228A1

WO2022242228A1 - Battery

Info

Publication number: WO2022242228A1
Application number: PCT/CN2022/074623
Authority: WO
Inventors: 李琼源; 陶芝勇; 赵映军; 章勇; 刘惠君
Original assignee: 深圳市拓邦锂电池有限公司
Priority date: 2021-05-16
Filing date: 2022-01-28
Publication date: 2022-11-24
Also published as: CN113270696A; CN117099257A

Abstract

The present invention provides a battery, comprising a metal shell, a battery cell provided in the metal shell, and a negative electrode busbar provided at the bottom of the metal shell and below the battery cell. The metal shell covers the side surface and the bottom surface of the battery cell, the bottom of the metal shell is provided with a first welding groove, the negative electrode busbar is provided with an electrode part and a second welding groove, the bottom of the metal shell is welded to the negative electrode busbar by means of the first welding groove, the electrode part is welded to the bottom of the metal shell, and the negative electrode busbar is welded to a negative electrode of the battery cell by means of the second welding groove. According to the battery, a battery cell is electrically connected to a steel shell by means of a negative electrode busbar, a first welding groove is formed in the lower side of the bottom of the metal shell, and an electrode part and a second welding groove are formed in the negative electrode busbar, the contact area between the steel shell and the negative electrode busbar is increased, the guide flow is increased, the battery has smaller internal resistance and discharge temperature rise, the battery performance is better guaranteed, and the customer satisfaction is improved.

Description

Battery

technical field

The invention relates to the technical field of batteries.

Background technique

Traditional batteries usually include a metal shell and a battery cell set in the metal shell, such as a cylindrical battery, whether it is a small battery of 18650, a medium battery of 40140 or a large battery of 63280, the negative electrode of the battery is generally center spot welded. Weld the metal shell with the welding needle. The welding needle is generally copper needle or aluminum oxide copper needle, or there is a tungsten steel head at the welding position of the copper needle. Due to the small contact area of this method, the conductivity is also small, and it needs to be carried out. Improve.

technical problem

The technical problem to be solved by the present invention is to provide an improved battery for the above-mentioned defects in the related art.

technical solution

The technical solutions adopted by the present invention to solve the technical problems include: providing a battery, including a metal case, an electric cell disposed in the metal case, and a battery disposed at the bottom of the metal case and below the electric cell Negative electrode bus piece, the metal shell covers the side and bottom surface of the battery core, the bottom of the metal shell is provided with a first welding groove, the negative electrode bus piece is provided with an electrode part and a second welding groove, and the metal shell The bottom is welded to the negative busbar through the first welding groove, the electrode part is welded to the bottom of the metal shell, and the negative busbar is welded to the negative electrode of the cell through the second welding groove.

Preferably, the bottom of the metal shell is provided with a sunken portion that sinks downward, and the electrode portion on the negative electrode bus piece protrudes downward and is in contact with the sunken portion.

Preferably, the first welding groove surrounds the periphery of the electrode part.

Preferably, the first welding groove surrounds the periphery of the second welding groove, and the positions of the first welding groove and the second welding groove do not overlap.

Preferably, the first welding groove is provided on the lower side of the bottom of the metal shell, protrudes upwards and contacts the negative electrode bus piece.

Preferably, the second welding groove is provided on the lower side of the negative electrode bus piece, and is in the shape of a strip, a ring or a polygon.

Preferably, the number of the second welding grooves is at least two and are respectively provided on both sides of the electrode part, and each of the second welding grooves is elongated.

Preferably, there are at least two second welding grooves intersecting each other, and the intersection point is the electrode part.

Preferably, the second welding groove is in the form of a ring around the periphery of the electrode part.

Preferably, the metal shell is cylindrical.

Beneficial effect

Implementing the technical solution of the present invention has at least the following beneficial effects: the battery realizes the electrical connection between the battery core and the steel shell through the negative busbar, the metal shell is provided with a first welding groove on the lower side of the upper bottom, and the negative busbar is provided with an electrode The inner part and the second welding groove increase the contact area between the steel shell and the negative electrode bus piece, increase the conduction capacity, make the battery have smaller internal resistance and discharge temperature rise, better guarantee the battery performance, and improve customer satisfaction.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a sectional view taken along an axis of a battery according to an embodiment of the present invention.

Fig. 2 is a partially enlarged view of part A in Fig. 1 .

FIG. 3 is a perspective view of an embodiment of a negative bus tab of the battery of FIG. 1 .

FIG. 4 is a perspective view of another embodiment of the negative bus tab of the battery of FIG. 1 .

Fig. 5 is a battery performance comparison table between the battery of the present invention and the traditional spot-welded metal shell battery mentioned in the background art.

The reference numerals in the figure indicate: metal shell 1 , sinking portion 11 , first welding groove 12 , negative electrode bus piece 2 , electrode portion 21 , second welding groove 22 , and battery core 3 .

Embodiments of the present invention

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that if the orientation or positional relationship indicated by "upper", "lower", "top", "bottom", "inner" and "outer" in the text is based on the orientation or positional relationship shown in the drawings, The construction and operation in a specific orientation is only for the convenience of describing the technical solution, but does not indicate that the device or element referred to must have a specific orientation, so it should not be construed as a limitation of the present invention. It should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "connection", "fixation" and "setup" should be understood in a broad sense if they appear in the text, for example, it can be a fixed connection or a Detachable connection, or integration; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element, or one or more intervening elements may also be present. If the terms "first", "second", "third", etc. appear in the text, they are only for the convenience of describing the technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, Thus, a feature defined as "first", "second", "third", etc. may expressly or implicitly include one or more of that feature. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Referring to FIGS. 1-3 , a battery in one embodiment of the present invention includes a metal case 1 , a cell 3 disposed in the metal case 1 , and a negative electrode collector disposed at the bottom of the metal case 1 and below the cell 3 Sheet 2, the metal shell 1 covers the side and bottom of the battery cell 3, the bottom of the metal shell 1 is provided with a first welding groove 12, the negative electrode bus piece 2 is provided with an electrode part 21 and a second welding groove 22, the metal shell 1 The bottom is welded to the negative electrode bus piece 2 through the first welding groove 12, specifically laser spot welding; the electrode part 21 of the negative electrode bus piece 2 is welded to the bottom of the metal shell 1, specifically resistance welding can be used; the negative electrode bus piece 2 is welded through the second welding The slot 22 is welded to the negative electrode of the battery cell 3 , and may be welded to the negative electrode current collector of the battery cell 3 .

The battery of the present invention realizes the electrical connection between the battery core 3 and the steel shell through the negative electrode bus piece 2. The metal shell 1 is provided with a first welding groove 12 on the upper bottom and lower side, and the negative electrode bus piece 2 is provided with an electrode part 21 and a second welding groove. The groove 22 increases the contact area between the steel shell and the negative electrode bus piece 2, increases the conduction capacity, makes the battery have smaller internal resistance and discharge temperature rise, better guarantees battery performance, and improves customer satisfaction.

Preferably, the metal shell 1 is integrally formed and may be a steel shell. The bottom of the metal case 1 is provided with a sinking portion 11 that sinks downward, and the electrode portion 21 on the negative electrode bus piece 2 protrudes downward and contacts the sinking portion 11 .

Preferably, the first welding groove 12 is annular and surrounds the periphery of the electrode part 21 and the periphery of the sinking part 11 . The first welding groove 12 surrounds the periphery of the second welding groove 22 , and the positions of the first welding groove 12 and the second welding groove 22 do not overlap. The first welding groove 12 is provided on the lower side of the bottom of the metal shell 1 , protrudes upwards and contacts the negative electrode bus piece 2 .

Preferably, the second welding groove 22 is provided on the lower side of the negative busbar 2 and is in the shape of a strip, a ring or a polygon.

Preferably, UV glue is coated on the second welding groove 22 for rust prevention.

Referring to FIG. 3 , in some embodiments, there are at least two second welding grooves 22 respectively provided on both sides of the electrode portion 21 , and each second welding groove 22 is elongated.

Referring to FIG. 4 , in some other embodiments, there are at least two second welding grooves 22 that intersect each other, and the intersection point is the electrode part 21 .

In some other embodiments, the second welding groove 22 is in the form of a ring around the periphery of the electrode portion 21 .

Preferably, the metal case 1 is cylindrical, and may be cylindrical, that is, the battery is a cylindrical battery, such as a small cylindrical battery of 18650, a medium cylindrical battery of 40140 or a large cylindrical battery of 63280.

It can be seen from the table in Fig. 5 that the battery of the present invention has smaller internal resistance and good discharge temperature, and its performance is obviously better than that of the traditional battery.

To sum up, the battery of the present invention realizes the electrical connection between the cell 3 and the steel shell through the negative bus piece 2, the metal shell 1 is provided with a first welding groove 12 on the upper bottom and the lower side, and the negative bus piece 2 is provided with an electrode part 21 and The second welding groove 22 increases the contact area between the steel shell and the negative electrode bus piece 2, increases the conduction capacity, makes the battery have smaller internal resistance and discharge temperature rise, better guarantees battery performance, and improves customer satisfaction.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications, combinations and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims

A battery, characterized in that it comprises a metal case (1), a cell (3) disposed in the metal case (1), and a bottom disposed in the metal case (1) and on the cell (3) The negative electrode bus piece (2) below, the metal shell (1) covers the side and bottom surface of the cell (3), and the bottom of the metal shell (1) is provided with a first welding groove (12) , the negative electrode bus piece (2) is provided with an electrode part (21) and a second welding groove (22), and the bottom of the metal shell (1) is connected to the negative electrode bus piece through the first welding groove (12) (2) Welding, the electrode part (21) is welded to the bottom of the metal shell (1), and the negative electrode bus piece (2) passes through the second welding slot (22) and the battery core (3) Negative welding.
The battery according to claim 1, characterized in that, the bottom of the metal shell (1) is provided with a sinking part (11) that sinks downward, and the electrode part (21) on the negative electrode bus piece (2) is ) protrudes downward and contacts with the sinking part (11).
The battery according to claim 1, characterized in that, the first welding groove (12) surrounds the periphery of the electrode part (21).
The battery according to claim 3, characterized in that, the first welding groove (12) surrounds the periphery of the second welding groove (22), and the first welding groove (12) and the second welding groove The positions of the grooves (22) do not overlap.
The battery according to claim 1, characterized in that, the first welding groove (12) is provided on the lower side of the bottom of the metal shell (1), protrudes upwards and contacts the negative electrode bus piece (2).
The battery according to claim 1, characterized in that, the second welding groove (22) is arranged on the lower side of the negative electrode bus piece (2), and is in the shape of a strip, a ring or a polygon.
The battery according to claim 6, characterized in that, the number of the second welding grooves (22) is at least two and are respectively provided on both sides of the electrode part (21), and each of the second welding grooves ( 22) In the shape of a long strip.
The battery according to claim 6, characterized in that the number of the second welding grooves (22) is at least two and intersect each other, and the intersection point is the electrode part (21).
The battery according to claim 6, characterized in that, the second welding groove (22) is annular around the periphery of the electrode part (21).
The battery according to claim 1, characterized in that, the metal shell (1) is cylindrical.