CN218274995U

CN218274995U - Power battery welding structure

Info

Publication number: CN218274995U
Application number: CN202222175331.1U
Authority: CN
Inventors: 贺智祺; 李聪利
Original assignee: Gree Altairnano New Energy Inc
Current assignee: Gree Altairnano New Energy Inc
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2023-01-10
Anticipated expiration: 2032-08-18

Abstract

The utility model discloses a power battery welded structure, this power battery welded structure are provided with utmost point post including lapping the subassembly on lapping the subassembly, are connected with the flexible coupling on the utmost point post, through interior outer lane open-ended welding orbit fixed connection between utmost point post and the flexible coupling. The utility model provides a power battery welded structure, through interior outer lane open-ended welding orbit fixed connection between utmost point post and the flexible coupling, when the electric current transmits to the welding area, the outside welding orbit can be shunted the electric current, make partial current flow in inside welding orbit department through the open region, the inside welding orbit of rethread transmits to utmost point post in, make full use of welding area, effective area when having improved the welding, be favorable to promoting the ability of overflowing of battery, and interior outer lane open-ended welding orbit easily realizes and operates, easily shaping in actual operation.

Description

Power battery welding structure

Technical Field

The utility model belongs to the technical field of the welding, especially, relate to a power battery welded structure.

Background

With the rapid development of the lithium battery industry, the lithium battery has been widely applied to electronic products in various fields. During the use process of the battery, the battery forms current through the movement of ions between the electrode assemblies, the current is transmitted to the flexible connection through the pole lugs, then is transmitted to the pole columns through the flexible connection, and finally is output to an electric appliance through the pole columns. And wherein the flexible coupling passes through laser welding with utmost point post and is connected, and the area of laser welding has decided the ability of overflowing between flexible coupling and the utmost point post.

The existing welding mode is closed-loop welding, such as circular welding, square welding, double-circular welding and the like, the effective overcurrent area is the welding area formed by the outermost circle of welding track, and when a battery forms larger overcurrent, a larger welding space is needed to meet the welding requirement; and the open welding, such as zigzag welding, spiral welding and the like, can meet the requirement of larger overflowing, but has higher difficulty in actual operation.

Therefore, it is necessary to design a welding structure for a power battery to solve the above-mentioned problems of requiring a large welding space when the battery is subjected to a large overcurrent and having high difficulty in welding operation.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems that a battery in the background art needs a large welding space when a large overcurrent is formed and the welding operation difficulty is high, a power battery welding structure is provided to solve the problems.

In order to achieve the above object, the utility model discloses a power battery welded structure's concrete technical scheme as follows:

the utility model provides a power battery welded structure, includes the apron subassembly, is provided with utmost point post on the apron subassembly, is connected with the flexible coupling on the utmost point post, and through interior outer lane open-ended welding orbit welded fastening between utmost point post and the flexible coupling.

Furthermore, the flexible connection is provided with an abutting part, the abutting part abuts against the pole, and the abutting part and the pole are welded and fixed on one surface of the abutting part away from the pole through the welding track of the inner ring opening and the outer ring opening.

Further, the welding track of the opening of the inner ring and the outer ring comprises an outer ring track and an inner ring track, and the shapes of the outer ring track and the inner ring track are the same.

Furthermore, a first opening is formed in the outer ring track, a second opening is formed in the inner ring track, and the directions of the first opening and the second opening are different.

Furthermore, a first opening is formed in the outer ring track, a second opening is formed in the inner ring track, and the directions of the first opening and the second opening are the same.

Furthermore, the opening size of the first opening is 1/5-1/4 of the outer ring track, and the opening size of the second opening is 1/5-1/4 of the inner ring track.

Furthermore, a third opening is formed in the outer track, and the inner track is closed.

Further, the outer and inner tracks are circular in shape.

Further, the outer and inner tracks are square in shape.

Further, the outer and inner tracks are elliptical in shape.

The utility model discloses a power battery welded structure has following advantage:

through interior outer lane open-ended welding orbit fixed connection between utmost point post and the flexible coupling, when the electric current transmits to the welding area, outside welding orbit can shunt the electric current, make partial electric current flow in inside welding orbit department through the open region, the inside welding orbit of rethread transmits to utmost point post in, make full use of welding area, effective area when having improved the welding, be favorable to promoting the ability of overflowing of battery, interior outer lane open-ended welding orbit easily realizes and operates moreover, easily shaping in actual operation.

Drawings

FIG. 1 is a first schematic view of a prior art welding track;

FIG. 2 is a second schematic diagram of a prior art welding track;

FIG. 3 is a third schematic view of a prior art welding track;

fig. 4 is a schematic structural view of the welding structure of the power battery of the present invention;

FIG. 5 is a schematic structural view of the positive flexible connection of the present invention;

FIG. 6 is a first schematic view of the welding track of the present invention;

FIG. 7 is a second schematic view of the welding track of the present invention;

fig. 8 is a third schematic structural view of the welding track of the present invention;

fig. 9 is a fourth schematic structural view of the welding track of the present invention;

fig. 10 is a fifth schematic structural view of the welding track of the present invention.

The notation in the figure is:

1. a cover plate assembly; 2. a pole column; 21. a positive pole column; 22. a negative electrode post; 3. soft connection; 31. the positive electrode is in soft connection; 311. a first abutting portion; 32. the negative electrode is in soft connection; 321. a second abutting portion; 4. an outer lane track; 41. a first opening; 42. a third opening; 5. an inner track; 51. a second opening; 6. spiral welding; 7. double-circle welding; 8. and (5) performing circular welding.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The power battery welding structure of the present invention is described below with reference to fig. 1 to 10.

With the rapid development of the lithium battery industry, the lithium battery has been widely applied to electronic products in various fields. And in the use process of the battery, the battery forms current through the ion movement between the electrode assemblies, the current is transmitted to the flexible connection 3 through the pole lugs, then is transmitted to the pole 2 through the flexible connection 3, and finally is output to an electric appliance through the pole 2.

The fixed mode between 3 and the utmost point post 2 of flexible coupling is very important, and flexible coupling 3 and utmost point post 2 are not fixed before, and flexible coupling 3 only contacts with utmost point post 2, and the centre has certain space, so can not necessarily electrically conduct between 3 and the utmost point post 2 of flexible coupling, even can electrically conduct after the contact, also can have great contact resistance, can produce a large amount of heats when using, is unfavorable for the stability of battery performance. After flexible coupling 3 and utmost point post 2 fixed connection, adopt welded mode fixed connection back between flexible coupling 3 and the utmost point post 2 promptly, flexible coupling 3 switches on through the welding with utmost point post 2, forms the road that can supply current to pass through. After the flexible coupling 3 is connected with utmost point post 2 through laser welding, the overcurrent ability between flexible coupling 3 and utmost point post 2 has been decided to laser welding's area.

The existing welding mode is closed-loop welding, such as circular welding, square welding, double-circle welding and the like, the effective area of overcurrent is the welding area formed by the outermost circle of welding tracks, when the battery forms larger overcurrent, a larger welding space is needed to meet the welding requirement, such as open welding, such as zigzag welding, spiral welding and the like, the welding mode can meet the larger overcurrent, but the welding tracks have a plurality of curvature changes or direction changes, the welding procedure is complex, accurate forming is difficult to achieve in the actual use process, and the difficulty is higher in actual operation.

As shown in fig. 1 to 3, the conventional circular welding tracks include a spiral welding 6, a double circular welding 7 and a circular welding 8. The spiral welding 6 can form a larger effective overcurrent area in a welding area, but because the welding track has more curvature change, the operation procedure of the equipment is complex, errors are easy to occur, and the actual operation is difficult to realize. The double-circle welding 7 enables the soft connection 3 to be better connected with the pole 2 than the circle welding 8, provides larger breaking force, but has little difference with the circle welding form in overcurrent capacity, so when the battery needs overlarge current, a larger welding area is needed to satisfy a larger welding track, and a larger overcurrent area is formed. Because the welding area increases, the corresponding welding area of the flexible connection 3 and the pole 2 also increases, which is not beneficial to the overall design of the pole 2 and the cover plate component 1.

As shown in fig. 4, the utility model provides a power battery welded structure, including apron subassembly 1, be provided with utmost point post 2 on the apron subassembly 1, be connected with flexible coupling 3 on the utmost point post 2, through interior outer lane open-ended welding orbit welded fastening between utmost point post 2 and the flexible coupling 3. In the use process of the battery, in the process of conducting current from the flexible connection 3 to the pole 2, the current firstly passes through the outer ring welding track, an unwelded area, namely an unwoven area, exists at the outer ring welding track, and the conductivity of the material is limited, so that redundant current can enter the interior from the unwelded area and then can be conducted through the inner conductive area.

Through interior outer lane open-ended welding track fixed connection between utmost point post 2 and the flexible coupling 3, when the electric current transmits to the welding area, outside welding track can shunt the electric current, make partial electric current flow in inside welding track department through the open region, the inside welding track of rethread transmits to utmost point post 2 in, make full use of welding area, effective area when having improved the welding, be favorable to promoting the current capacity of battery, interior outer lane open-ended welding track easily realizes and operates moreover, easily shaping in actual operation.

Further, as shown in fig. 4, the post 2 includes a positive post 21 and a negative post 22, and the flexible connection 3 includes a positive flexible connection 31 and a negative flexible connection 32. The positive electrode post 21 and the negative electrode post 22 are respectively installed through the cap assembly 1. The positive electrode flexible connector 31 is welded on the positive electrode pole 21, and the negative electrode flexible connector 32 is welded on the negative electrode pole 22.

Further, as shown in fig. 4, the flexible connection 3 is provided with an abutting portion, the abutting portion abuts against the pole 2, and the abutting portion is fixedly connected with the pole 2 through the welding track of the inner and outer ring openings on the surface of the abutting portion away from the pole 2. Specifically, the positive electrode flexible connection 31 is provided with a first contact portion 311, and the negative electrode flexible connection 32 is provided with a second contact portion 321. The first abutting portion 311 abuts against the positive electrode post 21, the second abutting portion 321 abuts against the negative electrode post 22, the first abutting portion 311 and the positive electrode post 21 are fixedly connected through the welding track of the inner and outer ring openings on the surface of the first abutting portion 311 away from the positive electrode post 21, and the second abutting portion 321 and the negative electrode post 22 are fixedly connected through the welding track of the inner and outer ring openings on the surface of the second abutting portion 321 away from the negative electrode post 22. In this embodiment, for the convenience of connection, the first abutting portion 311 and the second abutting portion 321 are both convex structures.

Welding is performed in a welding area on the back surface of the first abutting portion 311 on the positive electrode flexible connection 31, welding is performed in a welding area on the back surface of the second abutting portion 321 on the negative electrode flexible connection 32, and laser welding is performed in the welding areas of the positive electrode flexible connection 31 and the negative electrode flexible connection 32 through a welding device to form a welding track with an opening on the inner ring and the outer ring. Since the laser welding is performed by molten metal, the current is transmitted between the positive electrode soft joint 31 and the positive electrode tab 21 mainly through the weld metal formed by welding. The current is transmitted between the positive electrode soft joint 31 and the negative electrode post 22 mainly through the weld metal formed by welding.

Further, as shown in fig. 5 to 10, the welding locus of the inner and outer ring openings includes an outer ring locus 4 and an inner ring locus 5, and the outer ring locus 4 and the inner ring locus 5 are identical in shape. The outer track 4 is provided with a first opening 41, the inner track 5 is provided with a second opening 51, and the first opening 41 and the second opening 51 are different in direction. In other embodiments, the welding track may be formed by forming a first opening 41 on the outer track 4, forming a second opening 51 on the inner track 5, and forming the first opening 41 and the second opening 51 in the same direction. In other embodiments, the welding track may also be formed by opening the third opening 42 on the outer track 4 and closing the inner track 5.

Further, as shown in fig. 5 to 10, the opening size of the first opening 41 is 1/5 to 1/4 of the outer track 4, and the opening size of the second opening 51 is 1/5 to 1/4 of the inner track 5. The sizes of the first opening 41, the second opening 51 and the third opening 42 of the welding track are 1/5-1/4 of the respective closed tracks, the openings are large, the effective overcurrent area is small, and the electric core is not beneficial to having overlarge current; the opening is small, and a closed welding track is easy to form during welding, so that the current entering the inner welding track is reduced, and the inner welding track only plays a role in strengthening connection. In the present embodiment, the outer track 4 and the inner track 5 are circular in shape. In other embodiments, the outer track 4 and the inner track 5 may be square in shape. In other embodiments, the outer track 4 and the inner track 5 may also be elliptical in shape. The shapes of the outer track 4 and the inner track 5 may be other shapes as long as the outer track 4 and the inner track 5 have openings to satisfy the functions of the embodiment.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a power battery welded structure, its characterized in that, includes the apron subassembly, is provided with utmost point post on the apron subassembly, is connected with the flexible coupling on the utmost point post, and through interior outer lane open-ended welding track welded fastening between utmost point post and the flexible coupling.

2. The power battery welding structure according to claim 1, wherein the flexible connection is provided with a butting portion, the butting portion butts against the pole, and the butting portion and the pole are welded and fixed through a welding track of the inner ring opening and the outer ring opening on one surface of the butting portion, which is far away from the pole.

3. The power battery welding structure according to claim 1, wherein the welding tracks of the inner and outer ring openings comprise an outer ring track and an inner ring track, and the outer ring track and the inner ring track are identical in shape.

4. The welding structure for the power battery as claimed in claim 3, wherein the outer track is provided with a first opening, the inner track is provided with a second opening, and the first opening and the second opening are different in direction.

5. The power battery welding structure according to claim 3, wherein a first opening is formed in the outer ring track, a second opening is formed in the inner ring track, and the first opening and the second opening are in the same direction.

6. The power battery welding structure according to claim 4 or 5, wherein the opening size of the first opening is 1/5-1/4 of the track of the outer ring, and the opening size of the second opening is 1/5-1/4 of the track of the inner ring.

7. The welding structure for the power battery as claimed in claim 3, wherein the outer track is provided with a third opening, and the inner track is closed.

8. The power cell welding structure according to claim 6, wherein the outer race track and the inner race track are circular in shape.

9. The power battery welding structure according to claim 6, wherein the outer ring track and the inner ring track are square in shape.

10. The power battery welding structure according to claim 6, wherein the outer ring track and the inner ring track are elliptical in shape.