CN212874630U

CN212874630U - Battery cell adaptor, lithium ion battery and electric automobile

Info

Publication number: CN212874630U
Application number: CN202021493977.9U
Authority: CN
Inventors: 何庆庆; 戴亨伟; 杨伟; 陈虎
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-04-02
Anticipated expiration: 2030-07-24

Abstract

The utility model relates to a technical field is connected to lithium ion battery internal component, especially relates to an electricity core adaptor, lithium ion battery and electric automobile. The battery cell adapter is used for electrically connecting the positive plate to the outside of the battery or electrically connecting the negative plate to the outside of the battery, and the battery cell adapter is provided with a welding surface and a non-welding surface; the welding surface is welded and connected with a lug on the positive plate or a lug on the negative plate; and a plurality of welding contact increasing bulges or grooves are arranged on the welding surface. The utility model discloses an electricity core adaptor structure can increase utmost point ear and the area of contact of face of weld, reduce utmost point ear welding power, reduce welding defect, makes the welding peel off the volume of remaining increase and welding stretching resistance reinforcing simultaneously to improve utmost point ear welding goodness, reduce manufacturing cost.

Description

Battery cell adaptor, lithium ion battery and electric automobile

Technical Field

The utility model relates to a technical field is connected to lithium ion battery internal component, in particular to electricity core adaptor, lithium ion battery and electric automobile.

Background

With the progress of technology, the cost control requirements of power cell manufacturers on power cells are more and more strict, wherein the requirements include reducing the power of pins (or adapter sheets), tabs and welding protection sheets during welding, so that the manufacturing cost is reduced.

In the current lithium ion power battery structure, the welding tension and the residual stripping main measures for ensuring the welding of the pin (or the adapter sheet), the lug and the welding protection sheet are to improve the welding power, so that the pin (or the adapter sheet), the lug and the welding protection sheet are combined more tightly due to more sufficient melting, but the manufacturing cost of the battery cell is increased, and meanwhile, the defects of welding slag, explosion points, lug damage and the like are more easily generated during welding under high power, so that the excellent rate of manufacturing the battery cell is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electricity core adaptor aims at solving at least that current electricity core adaptor has the energy consumption that welding power height leads to high, and welding defect is many simultaneously, the optimal rate low scheduling problem.

And still further provide a lithium ion battery, electric automobile based on above-mentioned electricity core adaptor.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the battery cell adapter is used for electrically connecting the positive plate to the outside of the battery or electrically connecting the negative plate to the outside of the battery, and the battery cell adapter is provided with a welding surface and a non-welding surface; the welding surface is welded and connected with a lug on the positive plate or a lug on the negative plate;

and a plurality of welding contact increasing bulges or grooves are arranged on the welding surface.

Preferably, the height of the welding contact protrusion is 5-300 μm;

or the like, or, alternatively,

the depth of the depression of the welding contact groove is 5-300 mu m.

Preferably, the welding contact increasing bulge comprises any one of a casting bulge, a roll flower bulge and a notch bulge;

or the like, or, alternatively,

the welding contact increasing groove comprises any one of a roll flower groove and an indentation groove.

Preferably, the welding contact increasing protrusions comprise at least one of polygonal protrusions, circular protrusions, oval protrusions, elongated protrusions, curved protrusions and grid-shaped protrusions;

or the like, or, alternatively,

the welding contact increasing groove comprises at least one of a polygonal groove, a circular groove, an oval groove, a long-strip-shaped groove, a curved groove and a latticed groove.

Preferably, the polygonal protrusions comprise at least one of triangular protrusions, quadrangular protrusions, pentagonal protrusions, hexagonal protrusions, heptagonal protrusions, and octagonal protrusions;

the polygonal grooves comprise at least one of triangular grooves, quadrilateral grooves, pentagonal grooves, hexagonal grooves, heptagonal grooves and octagonal grooves.

Preferably, the cell adaptor is a pin or an adaptor sheet.

Correspondingly, the lithium ion battery comprises an adapter, a winding core and a pole, wherein the winding core is provided with a pole lug, one end of the adapter is connected with the pole lug in a welding way, the other end of the adapter is connected with the pole lug in a welding way,

the adaptor is the battery cell adaptor, and a welding surface of the battery cell adaptor is opposite to the lug and is in welded connection with the lug.

Preferably, the lithium ion battery further comprises a weld protection sheet;

the welding screening glass welding is in utmost point ear surface, the welding screening glass with electric core adaptor is just relative, just the welding screening glass with electric core adaptor does utmost point ear interval.

And the electric automobile comprises a lithium ion battery pack formed by a plurality of lithium ion battery modules, wherein each lithium ion battery module is composed of a plurality of lithium ion batteries, and each lithium ion battery is the lithium ion battery.

The utility model has the advantages of:

compared with the prior art, the utility model discloses an electricity core adaptor through the face of weld increase weld contact arch or groove structure's design, can increase the area of contact of utmost point ear and face of weld, reduce utmost point ear welding power, reduce welding defect, make the welding peel off the volume of remaining increase and welding stretching resistance reinforcing simultaneously to improve utmost point ear welding goodness, reduce manufacturing cost.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings required to be used in the embodiments are briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Furthermore, these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Wherein:

fig. 1 is a schematic perspective view of a bare cell of a lithium ion battery;

fig. 2 is an explosion schematic diagram of a bare cell of a lithium ion battery;

fig. 3 is an explosion schematic diagram of a bare cell of a lithium ion battery of another configuration;

fig. 4 is a schematic front view of the cell adaptor of the present invention;

fig. 5 is a schematic view of the battery cell adapter of the present invention from the bottom;

FIG. 6 is an enlarged view of a portion M of FIG. 5;

FIG. 7 is an enlarged view of a portion N of FIG. 6;

FIG. 8 is an enlarged partial view of a portion M of FIG. 5 in an alternate configuration;

FIG. 9 is an enlarged partial view of the portion N of FIG. 6 in an alternative configuration;

FIG. 10 is an enlarged partial view of the portion M of FIG. 5 in an alternate configuration;

FIG. 11 is an enlarged partial view of the portion N of FIG. 6 in an alternative configuration;

FIG. 12 is an enlarged partial view of a portion M of FIG. 5 in an alternate configuration;

FIG. 13 is a schematic cross-sectional view taken along line A-A of FIG. 12;

FIG. 14 is an enlarged partial view of a portion M of FIG. 5 in an alternate configuration;

FIG. 15 is a schematic cross-sectional view taken along line B-B of FIG. 12;

fig. 16 is an exploded schematic view of a bare cell of a lithium ion battery of another configuration;

wherein the content of the first and second substances,

1-cell adapter, 11-welding surface, 111 welding contact protrusion or groove; 2-welding the protective sheet; 3-core winding, 31-tab; 4-a top cover;

h-build-up contact bump height or groove depth.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following description, with reference to the drawings of the embodiments of the present invention, is provided for clear and complete description of the technical solutions of the embodiments of the present invention.

It is to be understood that the embodiments described are only some of the disclosed embodiments of the invention, and not all of them. Based on the described embodiments, other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. As used herein, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

When an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly disposed on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solutions.

Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The meaning of "plurality" is two or more unless specifically limited otherwise. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

The noun defines: the utility model discloses in, pin or switching piece can be indicateed to the electric core adaptor, also can be the spare part that is used for drawing utmost point ear among the lithium ion battery of other structures, as long as these spare parts and utmost point ear welding are in the same place and draw utmost point ear in order to realize with the electricity of utmost point post being connected, all belong to the utility model discloses the electric core adaptor of saying.

Referring to fig. 2, 4, 5, 6, and 7, the present invention relates to a cell adaptor 1.

The cell adaptor 1 has a welding surface 11 and a non-welding surface (the non-welding surface is not labeled), where the welding surface 11 refers to the welding connection between the welding surface 11 and the tab 31 when the tab 31 of the winding core 3 is welded.

Wherein, roll up core 3 and include utmost point ear 31 to utmost point ear 31 includes anodal ear and negative pole ear, and electric core adaptor 1 generally includes electric core anodal adaptor and electric core negative pole adaptor, wherein electric core anodal adaptor with anodal ear welded connection, electric core negative pole adaptor with negative pole ear welded connection.

A plurality of solder contact bumps or grooves 111 are provided on the soldering surface 11.

In some embodiments, the bump height H of the solder build-up contact bump 111 is any height between 5 μm and 300 μm, such as 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 15 μm, 16 μm, 18 μm, 20 μm, 25 μm, 28 μm, 30 μm, and the like.

In some embodiments, the recess depth H of the solder contact increasing groove 11 is any depth between 5 μm and 300 μm, such as 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 15 μm, 16 μm, 18 μm, 20 μm, 25 μm, 28 μm, 30 μm, etc.

In some embodiments, the weld-build contact bumps 111 comprise any of cast bumps, roll-patterned bumps, and scored bumps. That is, the weld-adding protrusion 111 on the cell adaptor 1 may be a cast protrusion on the welding surface 11 of the cell adaptor 1 by means of a casting mold structure in the casting process of the cell adaptor 1, or may be a roll-patterned protrusion on the welding surface 11 of the cell adaptor 1 by embossing or roll-patterned process, or may be a notch protrusion on the welding surface 11 of the cell adaptor 1 by etching the cell adaptor 1.

In some embodiments, the weld-build contact groove 111 comprises any of a knurled groove, a scored groove. The formation process of the embossed groove and the indented groove can refer to the process of increasing the welding contact protrusion 111.

In addition, the weld-increasing contact projection or groove 111 may also be formed by cold heading.

In some embodiments, the solder contact bumps 111 include at least one of polygonal bumps, circular bumps, elliptical bumps, elongated bumps, curvilinear bumps, grid-like bumps, and the like.

In some embodiments, the polygonal protrusions include at least one of triangular protrusions, quadrilateral protrusions, pentagonal protrusions, hexagonal protrusions, heptagonal protrusions, octagonal protrusions, and the like. The polygonal bulges can be regular polygonal bulges or irregular regular polygonal bulges. Regular polygonal projections such as regular triangular projections, regular quadrangular projections, regular pentagonal projections, regular hexagonal projections, regular octagonal projections, and the like are preferable. The regular polygonal protrusions are beneficial to enabling the lug to be in uniform contact with each protrusion, and the problem that the lug is wrinkled or warped due to uneven stress is reduced.

Referring to fig. 4-15, in some embodiments, the solder contact increasing grooves 111 include at least one of polygonal grooves, circular grooves, elliptical grooves, elongated grooves, curved grooves, and grid-shaped grooves.

Fig. 6 and 7 are partially enlarged schematic diagrams of fig. 4 and 5, which show that elongated grooves are formed on the welding surface 11 of the cell adaptor 1, and the orientation of the elongated grooves is perpendicular to the long side of the cell adaptor 1, and these elongated grooves are the weld-increasing contact grooves 111. The truncation surfaces of the strip-shaped grooves are triangular.

Fig. 8 and 9 are partially enlarged schematic views of another form of fig. 4 and 5, which show that elongated grooves are formed on the welding surface 11 of the cell adaptor 1, and the orientation of the elongated grooves forms an included angle of 30 ° to 60 ° with the long side of the cell adaptor 1, and these elongated grooves are the increase welding contact grooves 111. The truncation surfaces of the strip-shaped grooves are triangular.

Fig. 10 and 11 are enlarged partial schematic views of another form of fig. 4 and 5, which show that grid-shaped grooves, namely weld-increasing contact grooves 111, are formed on the welding surface 11 of the cell adaptor 1, and the cross sections of the grid-shaped grooves are triangular.

Fig. 12 and 13 are enlarged partial views of another form of fig. 4 and 5, which show that square grooves, i.e., weld-on contact grooves 111, are formed on the welding surface 11 of the cell adapter 1, and the cross sections of the square grooves are square or rectangular.

Fig. 14 and 15 are enlarged partial views of another form of fig. 4 and 5, which show that circular grooves, i.e., weld-adding contact grooves 111, are formed on the welding surface 11 of the cell adapter 1, and the cross sections of the circular grooves are semicircular.

In some embodiments, the polygonal grooves include at least one of triangular grooves, quadrangular grooves, pentagonal grooves, hexagonal grooves, heptagonal grooves, octagonal grooves, and the like.

Referring to fig. 1 and fig. 2, there are shown schematic diagrams of an explosion of a cell adaptor 1, a welding protection sheet 2, a winding core 3, and a top cover 4.

The cell adaptor 1 in the figure can be called as pins, each pin is provided with two welding surfaces 11, each welding surface 11 is provided with the welding contact protrusion or groove 111 mentioned above, and one pin can be welded with two winding cores 3, so that the multi-winding core 3 can be welded.

Referring to fig. 3, an explosion diagram of a cell adaptor 1, a welding protection sheet 2, a winding core 3, and a top cover 4 with one structure is shown.

The cell adapter 1 of the figure can also be referred to as pins, each pin has a soldering surface 11, and the soldering surface 11 has the above-mentioned soldering contact protrusion or groove 111, and a pin can be soldered to a single winding core 3, thereby realizing soldering of the single winding core 3.

Referring to fig. 16, an exploded view of a cell adaptor 1, a welding protection sheet 2, a winding core 3, and a top cover 4 is shown.

The cell adaptor 1 of the figure can be called an adaptor sheet, each adaptor sheet has two welding surfaces 11, each welding surface 11 has the welding contact protrusion or groove 111 mentioned above, and one adaptor sheet can be welded with two winding cores 3, thereby realizing the welding of the double winding cores 3.

The cell adaptor 1 of the utility model has the advantages that the welding surface is provided with the welding contact protrusion or groove structure, so that the contact area between the lug and the welding surface of the cell adaptor can be effectively increased, and the power required by welding the lug can be reduced, thereby reducing the welding defects such as explosion points, welding slag and damaged lug; on the basis, the welding stripping residual quantity is increased, the welding tensile resistance is enhanced, the welding quality rate of the pole lug is improved, and the manufacturing cost is reduced.

Based on foretell electric core adaptor 1, the utility model discloses still further provide a lithium ion battery.

The lithium ion battery at least comprises an adapter, a winding core and a pole.

The winding core is provided with tabs which comprise a positive tab and a negative tab, and the positive/negative tabs are provided with a first surface and a second surface;

the adapter comprises a positive adapter and a negative adapter, the adapter is the battery cell adapter 1, and a welding surface 11 of the battery cell adapter 1 is opposite to and in welding connection with the first or second surface of the positive/negative electrode lug.

The lithium ion battery also comprises a welding protection sheet 2, when the welding surface 11 of the battery cell adapter piece 1 is welded with the first surface of the positive/negative electrode lug, the welding protection sheet 2 is welded with the second surface of the positive/negative electrode lug, and the welding protection sheet 2 is opposite to the welding surface 11 of the battery cell adapter piece 1, so that the welding protection effect is achieved; when the welding surface 11 of the cell adaptor 1 is welded with the second surface of the positive/negative electrode lug, the welding protection sheet 2 is welded with the first surface of the positive/negative electrode lug, and the welding protection sheet 2 is opposite to the welding surface 11 of the cell adaptor 1, so that the welding protection effect is achieved.

Based on foretell electric core adaptor 1 and lithium ion battery, the utility model discloses still further provide a lithium ion battery module.

The lithium ion battery module comprises a plurality of lithium ion batteries, and the used lithium ion batteries are the lithium ion batteries.

Furthermore, on the basis of the lithium ion battery module, a lithium ion battery pack is provided.

The lithium ion battery pack comprises a plurality of lithium ion battery modules, the related lithium ion battery modules are the lithium ion battery modules, and the lithium ion battery pack can be applied to electric vehicles, such as pure Electric Vehicles (EV), Hybrid Electric Vehicles (HEV), plug-in hybrid electric vehicles (PHEV) and the like.

Finally, on the basis of the lithium ion battery pack, the electric automobile is provided.

The electric automobile comprises a battery pack, and the related battery pack is the lithium ion battery pack.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.

Claims

1. The battery cell adapter is used for electrically connecting the positive plate to the outside of the battery or electrically connecting the negative plate to the outside of the battery, and is characterized by comprising a welding surface and a non-welding surface; the welding surface is used for being welded and connected with a lug on the positive plate or a lug on the negative plate;

2. The cell interposer of claim 1, wherein the build-up contact bumps have a bump height of 5 μ ι η to 300 μ ι η;

or the like, or, alternatively,

the depth of the depression of the welding contact groove is 5-300 mu m.

3. The cell interposer of claim 1 or 2, wherein the weld-build contact protrusion comprises any one of a cast protrusion, a knurled protrusion, and a scored protrusion;

or the like, or, alternatively,

4. The cell adaptor of claim 1 or 2, wherein the weld-adding contact protrusions comprise at least one of polygonal protrusions, circular protrusions, oval protrusions, elongated protrusions, curved protrusions, and grid-shaped protrusions;

or the like, or, alternatively,

5. The cell adaptor of claim 4, wherein the polygonal protrusion comprises at least one of a triangular protrusion, a quadrilateral protrusion, a pentagonal protrusion, a hexagonal protrusion, a heptagonal protrusion, and an octagonal protrusion;

6. The cell interposer of claim 4, wherein the cell interposer is a pin or an interposer.

7. Lithium ion battery, including adaptor, roll up core, utmost point post, it has utmost point ear to roll up the core, adaptor one end with utmost point ear welded connection, the other end with utmost point post welded connection, its characterized in that, the adaptor be claim 1 ~ 6 any electricity core adaptor, the face of weld of electricity core adaptor with utmost point ear just to and welded connection.

8. The lithium ion battery of claim 7, further comprising a weld protection sheet;

9. An electric vehicle comprising a lithium ion battery pack formed from a plurality of lithium ion battery modules, said lithium ion battery modules comprising a plurality of lithium ion batteries, wherein said lithium ion batteries are the lithium ion batteries of claim 8.