CN212366046U

CN212366046U - Lithium battery tab assembly structure

Info

Publication number: CN212366046U
Application number: CN202021375919.6U
Authority: CN
Inventors: 徐双杰
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-01-15
Anticipated expiration: 2030-07-14

Abstract

The utility model discloses a lithium battery tab assembly structure relates to lithium battery processing technology field. The lithium battery tab assembly structure comprises a cover plate, a current collecting disc and tabs. The cover plate is connected with the current collecting disc. The two ends of the lug are respectively fixedly connected with the cover plate and the current collecting disc, the lug is provided with a bending part and a positioning part, the lug can be bent along the bending part, and after the bending, the current collecting disc can be folded to one side of the cover plate; location portion includes first location portion and second location portion, locates the both sides of kink respectively relatively, and utmost point ear back of buckling, first location portion and second location portion can joint each other. The lithium battery tab assembly structure shortens the tab length, saves the manufacturing cost and reduces the risk of thermal runaway caused by tab heating; and the bending times and bending size control points are also reduced, the defective product proportion caused by the abnormal bending size of the lug is reduced, and the production efficiency of a production line is improved. And realize the location through the mutual joint of first location portion and second location portion, improve the accuracy of buckling.

Description

Lithium battery tab assembly structure

Technical Field

The utility model relates to a lithium cell processing technology field especially relates to a lithium cell utmost point ear assembly structure.

Background

The cylindrical aluminum shell lithium ion battery with the full tabs is a common assembly mode at present, the two ends of each tab are respectively connected with a current collecting disc and a cover plate, a pole is arranged at the center of the cover plate, the current collecting discs are folded to one side of the cover plate through bending of the tabs, the current collecting discs correspond to the cover plate, and the assembly of a tab structure of the lithium ion battery is realized through welding and fixing of the current collecting discs and the tabs and fixing of the tabs and the cover plate poles.

In the existing tab assembly structure, one end of a tab extends out from the edge of the current collecting disc, and the end surface of the other end of the tab is provided with a welding point so as to be welded and fixed with a projecting post on a cover plate. During assembly, the current collecting disc is bent twice through the lugs (namely the lugs are in a Z shape), the bent current collecting disc is parallel to the cover plate, and assembly and fixation are further achieved through welding. When the current collector is used, current flows to the cover plate from the current collecting disc through the pole lugs and the pole columns, and the current guiding effect is achieved. However, the tab is longer due to two times of bending, and firstly, from the physical point of view, under the condition that the material, the sectional area and the like of the tab are consistent, the longer the tab is, the more serious the heating is when the current passes through, which is unfavorable for the safety of the battery; secondly, from the manufacturing process of the battery, the number of control points required in the two-time bending process is large, and once the size of one bending process is deviated, the current collecting disc and the cover plate are dislocated, so that the cover plate and the opening of the battery shell cannot be properly aligned, manual repair treatment is needed, and the automatic production efficiency is affected.

Therefore, a tab assembly structure for a lithium battery is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pair of lithium battery tab assembly structure can shorten utmost point ear length, practices thrift manufacturing cost, reduces utmost point ear and generates heat the thermal runaway risk that leads to, improves the accuracy of buckling to improve whole production line production efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

a lithium battery tab assembly structure includes:

a cover plate;

the current collecting disc is connected with the cover plate:

the two ends of the lug are respectively fixedly connected with the cover plate and the current collecting disc, a bending part and a positioning part are arranged on the lug, the lug can be bent along the bending part, and after the lug is bent, the current collecting disc can be folded to one side of the cover plate;

the positioning part comprises a first positioning part and a second positioning part which are respectively and oppositely arranged on two sides of the bending part, and the first positioning part and the second positioning part can be mutually clamped after the tab is bent.

Optionally, one of the first positioning portion and the second positioning portion is a positioning groove, and the other is a positioning protrusion, and the positioning protrusion can be clamped in the positioning groove.

Optionally, the first positioning portion is disposed away from the collecting tray, and the first positioning portion is in contact with the cover plate.

Optionally, a plurality of welding regions are further arranged on the current collecting disc, and the plurality of welding regions are circumferentially distributed on the current collecting disc at intervals.

Optionally, an opening is formed in the edge of the current collecting plate, one end of the tab is fixedly connected with one of the welding areas through the opening, and the other end of the tab extends out of the opening and is fixedly connected with the cover plate.

Optionally, a first through hole and a second through hole are further formed in the current collecting disc, the first through hole is located in a gap between two adjacent welding areas, and the second through hole is formed in the center of the current collecting disc.

Optionally, the bent portion is not disposed beyond an edge of the cover plate.

Optionally, a liquid injection hole is formed in the cover plate.

Optionally, the liquid injection hole is disposed between the bending part and the edge of the cover plate.

Optionally, a positioning pole is arranged at the center of the cover plate, a welding point is arranged on the tab, and the welding point is welded and fixed with the positioning pole.

The utility model has the advantages that:

the utility model provides a lithium battery tab assembly structure, once through the kink the current collection dish of buckling just can roll over to apron one side and realize the installation fixed, has shortened utmost point ear length, practices thrift manufacturing cost and has reduced the thermal runaway risk that utmost point ear generated heat and arouse. The bending times and the bending size control points are reduced by one-time bending, the defective product proportion caused by the abnormal bending size of the tab is reduced, and the production efficiency of a production line is improved. The location is realized through the mutual joint of first location portion and second location portion during buckling, improves the accuracy of buckling.

Drawings

Fig. 1 is a schematic overall structure diagram i of a tab assembly structure of a lithium battery provided in an embodiment of the present invention;

fig. 2 is a schematic view of an overall structure of a tab assembly structure of a lithium battery according to an embodiment of the present invention;

fig. 3 is a schematic view of a bent overall structure of a tab assembly structure of a lithium battery according to an embodiment of the present invention;

fig. 4 is a schematic diagram of the bent overall structure of the tab assembly structure of a lithium battery according to an embodiment of the present invention.

In the figure:

1. a cover plate; 11. a liquid injection hole; 12. positioning the pole; 2. a current collecting plate; 21. a welding area; 22. a first through hole; 23. a second through hole; 3. a tab; 31. a bending section; 32. a positioning part; 321. a first positioning portion; 322. a second positioning portion; 33. and (7) welding points.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting 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" and "second" 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.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1-4, the tab assembly structure for a lithium battery comprises a cover plate 1, a current collecting disc 2 and tabs 3, wherein the cover plate 1 is connected with the current collecting disc 2 through the tabs 3. The cap plate 1 is coupled to a battery case for sealing the battery. The collecting tray 2 is used for collecting current for the battery and transmitting the current to the cover plate 1. Two ends of the tab 3 are respectively fixedly connected with the cover plate 1 and the current collecting disc 2, a bending part 31 and a positioning part 32 are arranged on the tab 3, the tab 3 can be bent along the bending part 31, and after the bending, the current collecting disc 2 is folded towards one side of the cover plate 1. The positioning portion 32 includes a first positioning portion 321 and a second positioning portion 322, which are respectively disposed at two sides of the bending portion 31, and after the tab 3 is bent, the first positioning portion 321 and the second positioning portion 322 can be engaged with each other. The current collecting disc 2 can be folded towards one side of the cover plate 1 through one-time bending of the bending part 31 to realize installation and fixation, the length of the lug 3 is shortened, the manufacturing cost is saved, and the thermal runaway risk caused by heating of the lug 3 is reduced. The bending times and the bending size control points are reduced by one-time bending, the defective product proportion caused by abnormal bending size of the tab 3 is reduced, and the production efficiency of a production line is improved. And the first positioning part 321 and the second positioning part 322 are clamped with each other to realize positioning, so that the bending accuracy is improved.

As shown in fig. 1, optionally, the cover plate 1 is a circular cover plate, and in other embodiments, the cover plate 1 may be rectangular or in other shapes as needed, which is not limited to the embodiment. Furthermore, in order to conveniently inject electrolyte into the battery, the cover plate 1 is also provided with an injection hole 11, the injection hole 11 is a circular through hole, the diameter of the injection hole is 1.0mm-1.5mm, and the distance between the circle center of the injection hole and the edge of the cover plate 1 is 2mm-4 mm. The liquid injection hole 11 may be provided in plural to improve the liquid injection efficiency. The central position of the cover plate 1 is also provided with a positioning pole post 12, the positioning pole post 12 is a circular bulge and can be formed by a stamping process, and the diameter of the positioning pole post is 3mm-8 mm.

Accordingly, as shown in fig. 1 and 2, the current collecting plate 2 is a circular thin plate, but in other embodiments, the current collecting plate 2 may be a rectangular shape or other shapes as needed, and is not limited to this embodiment. Preferably, the collecting disc 2 is concentrically arranged with the cover plate 1, and the diameter of the collecting disc 2 is smaller than that of the cover plate 1. The diameter of the collecting plate 2 is set to 24mm-28 mm. Furthermore, a plurality of welding areas 21 are arranged on the current collecting plate 2, and the plurality of welding areas 21 are circumferentially distributed on the current collecting plate 2 at intervals. Illustratively, the weld area 21 is a scalloped groove formed by a stamping process. The current collecting disk 2 is joined to the battery active part by laser welding the fan-shaped groove region. In this embodiment, three fan-shaped grooves are uniformly distributed on the current collecting plate 2, so as to improve the welding stability. The edge of the collecting tray 2 is also provided with an opening.

Further, in order to facilitate the circulation of the electrolyte, the collecting tray 2 is further provided with a first through hole 22 and a second through hole 23, the first through hole 22 is located in a gap between two adjacent welding areas 21, and the second through hole 23 is arranged at the center of the collecting tray 2. Illustratively, the first through-hole 22 is an elongated hole disposed along the length of the gap. In the present embodiment, the number of the first through holes 22 is three, that is, one first through hole 22 is provided at the gap between every two fan-shaped grooves. The second through hole 23 is a circular hole. In other embodiments, the shapes of the first through hole 22 and the second through hole 23 may be set according to needs, and are not limited to this embodiment.

As shown in fig. 2, alternatively, one end of the tab 3 is fixedly connected to one of the welding regions 21 through an opening, and the other end of the tab 3 extends out of the opening and is fixedly connected to the cover plate 1. Illustratively, the tab 3 includes a circular region and a rectangular region connected. The diameter of the circular area is 14mm-20mm, the circular area and the cover plate 1 are arranged concentrically, and the area of the circular area is smaller than that of the cover plate 1 and the current collecting disc 2, namely, the installation of the cover plate 1 and the battery shell is not influenced. The center of the circular area is provided with a welding point 33, and the welding point 33 and the positioning pole 12 are welded by laser to realize the fixed connection of the pole ear 3 and the cover plate 1. The rectangular area extends from the edge of the circular area and is fixedly connected with one of the welding areas 21 of the current collecting plate 2 through the opening. The length of the rectangular area (along the direction from the center of the collecting plate 2 to the center of the cover plate 1) is 8mm-12mm, and the width is 16mm-18 mm.

As shown in fig. 2 and 3, the bent portion 31 is provided in the rectangular region, and the bent portion 31 facilitates the bending of the current collecting plate 2 toward the cover plate 1, thereby improving the bending efficiency. The length of the bent part 31 is equal to the width of the rectangular area, and the bent part 31 is not disposed beyond the edge of the cover plate 1, so that the disposition of the bent part 31 does not affect the installation of the battery case. Since the gap between the bent portion 31 and the edge of the cover plate 1 is large relative to the other regions of the cover plate 1 not covered by the tab 3, the diameter of the liquid injection hole 11 can be increased as appropriate to facilitate liquid injection by providing the liquid injection hole 11 at this position. As shown in fig. 4, after being bent by the bent portion 31, a gap is formed between the current collecting disk 2 and the circular region of the tab 3 to buffer the battery winding core.

Alternatively, as shown in fig. 2 to 4, the first positioning portion 321 and the second positioning portion 322 are respectively disposed in parallel at two sides of the bending portion 31, and the length thereof is consistent with the width of the rectangular region of the tab 3. One of the first positioning portion 321 and the second positioning portion 322 is a positioning groove, and the other is a positioning protrusion, and the positioning protrusion can be clamped in the positioning groove. First location portion 321 is kept away from current collecting disc 2 and is set up, and first location portion 321 and apron 1 contact, according to this setting, and partial electric current passes through first location portion 321 and directly transmits to apron 1, and the current realization reposition of redundant personnel on the utmost point ear 3 further alleviates utmost point ear 3 condition of generating heat. In this embodiment, the first positioning portion 321 is a positioning groove, the bottom of the positioning groove contacts with the surface of the cover plate 1, and the second positioning portion 322 is a positioning protrusion to be engaged with the positioning groove.

Therefore, the utility model provides a lithium battery tab assembly structure, once through kink 31 buckle, current collection dish 2 just can roll over to 1 one side of apron and realize the installation fixed, has shortened utmost point ear 3 length, practices thrift manufacturing cost and has reduced utmost point ear 3 and generate heat the thermal runaway risk that leads to. The bending times and the bending size control points are reduced by one-time bending, the defective product proportion caused by abnormal bending size of the tab 3 is reduced, and the production efficiency of a production line is improved. When the bending machine is bent, the first positioning part 321 and the second positioning part 322 are clamped with each other to realize positioning, and the bending accuracy is improved.

Further, the first positioning portion 321 is disposed away from the current collecting plate 2, and the first positioning portion 321 contacts the cover plate 1, so that a part of the current is directly transmitted to the cover plate 1 through the first positioning portion 321, and the current on the tab 3 is shunted, thereby further reducing the heat generation of the tab 3.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a lithium battery tab assembly structure which characterized in that includes:

a cover plate (1);

current collection dish (2), current collection dish (2) with apron (1) is connected:

the two ends of the tab (3) are respectively fixedly connected with the cover plate (1) and the current collecting disc (2), a bending part (31) and a positioning part (32) are arranged on the tab (3), the tab (3) can be bent along the bending part (31), and after bending, the current collecting disc (2) can be folded to one side of the cover plate (1);

the positioning portion (32) comprises a first positioning portion (321) and a second positioning portion (322) which are respectively arranged on two sides of the bending portion (31) relatively, and the first positioning portion (321) and the second positioning portion (322) can be clamped with each other after the tab (3) is bent.

2. The tab assembly structure for a lithium battery as claimed in claim 1, wherein one of the first positioning portion (321) and the second positioning portion (322) is a positioning groove, and the other one is a positioning protrusion, and the positioning protrusion can be engaged with the positioning groove.

3. The tab assembling structure for lithium batteries according to claim 1 or 2, wherein the first positioning part (321) is disposed away from the current collecting plate (2), and the first positioning part (321) is in contact with the cap plate (1).

4. The tab assembly structure for lithium batteries according to claim 1 or 2, wherein the current collecting disc (2) is further provided with a plurality of welding regions (21), and the plurality of welding regions (21) are circumferentially distributed on the current collecting disc (2) at intervals.

5. The tab assembly structure for a lithium battery as claimed in claim 4, wherein the edge of the current collecting disc (2) is provided with an opening, one end of the tab (3) is fixedly connected with one of the welding areas (21) through the opening, and the other end of the tab (3) extends out of the opening and is fixedly connected with the cover plate (1).

6. The tab assembly structure for a lithium battery as claimed in claim 4, wherein the current collecting plate (2) is further provided with a first through hole (22) and a second through hole (23), the first through hole (22) is located at a gap between two adjacent welding regions (21), and the second through hole (23) is provided at a central position of the current collecting plate (2).

7. The lithium battery tab assembling structure as claimed in claim 1 or 2, wherein the bent portion (31) is not disposed beyond the edge of the cap plate (1).

8. The tab assembling structure for lithium batteries according to claim 7, wherein the cover plate (1) is provided with a liquid injection hole (11).

9. The lithium battery tab assembling structure according to claim 8, wherein the liquid injection hole (11) is provided between the bent portion (31) and the edge of the lid plate (1).

10. The lithium battery tab assembly structure as claimed in claim 1 or 2, wherein a positioning post (12) is disposed at the center of the cover plate (1), a welding point (33) is disposed on the tab (3), and the welding point (33) is welded and fixed to the positioning post (12).