CN203377304U

CN203377304U - Lithium ion secondary battery

Info

Publication number: CN203377304U
Application number: CN201320452104.7U
Authority: CN
Inventors: 王继生; 孟亚斌
Original assignee: SHENZHEN UTILITY POWER SOURCE Co Ltd
Current assignee: Shenzhen Youteli Energy Co ltd
Priority date: 2013-07-26
Filing date: 2013-07-26
Publication date: 2014-01-01
Anticipated expiration: 2023-07-26

Abstract

The utility model is applicable to the field of batteries and discloses a lithium ion secondary battery. The lithium ion secondary battery comprises a cylindrical metal shell body with an inner cavity, a rolled core arranged in the shell body, a positive electrode lug or a negative electrode lug with ends which are electrically connected with the rolled core, and an insulation spacer arranged on the end of the rolled core, wherein the shell body is provided with a closed end and an opened end; the other end of the positive electrode lug or the negative electrode lug penetrates through the insulation spacer and electrically connected with a conductive metal sheet; the metal sheet is opposite to the closed end of the shell body; the edge of the metal sheet is propped against the inner shell surface of the shell body. By using the lithium ion secondary battery, the positive electrode lug or the negative electrode lug is not welded at the bottom of the shell body directly, but the positive electrode lug or the negative electrode lug is welded on the metal sheet firstly, and then the metal sheet is fixed in the shell body, so that the electrode plugs can be welded on the exterior of the shell body; compared with the blinding welding structure manner of the prior art, the reliability of the finished product is higher, and the welding rework rate is low, so that the cost of the products is lower.

Description

A kind of lithium rechargeable battery

Technical field

The utility model belongs to the battery technology field, relates in particular to a kind of lithium rechargeable battery.

Background technology

For traditional cylindricality lithium rechargeable battery, as shown in Figure 1, its housing adopts steel or aluminium to make usually, for the cylindricality lithium rechargeable battery with blind end, the bottom lug is generally at the bottom of the mode of employing welding directly is welded on shell, but, due to the housing bottom blind end that is cylindrical body, can't see and look at all when welding, for " blind weldering ", bonding power is on the low side, and rosin joint occurs, if bonding power is higher, can destroy again the coating on bottom shell surface, cause bottom corrosion or protruding spot, thereby this welding manner poor reliability, the battery poor reliability produced, and blind weldering easily causes lug and bottom contact-making surface out-of-flatness and causes occurring spark phenomenon, has potential safety hazard, further, whether this kind of welding manner, can only good by follow-up check checking welding because can't be visual during welding, if failure welding, the welding of need doing over again, so repeatedly, cause production efficiency lowly, production cost increases, moreover, in the design of multi pole ears volume core, if adopt the mode of the blind weldering in bottom, the consistency of the reliability of multi pole ears welding and welding impedance can't ensure, thereby cause the disequilibrium of gathering at multi pole ears place electric current, the product and the design parameter that produce differ greatly.

The utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and the lithium rechargeable battery that a kind of production efficiency is high, production cost is low, product reliability is good is provided.

The utility model is achieved in that a kind of lithium rechargeable battery, comprise tubular metal shell with inner chamber, be located at volume core in described housing, anode ear or the negative electrode lug of end and the electric connection of described volume core and be located at the insulation spacer of described volume core end, described housing has a blind end and an openend, the sheet metal that the other end of described anode ear or negative electrode lug passes through described insulation spacer and a conduction is electrically connected, described sheet metal is relative with the blind end of described housing, and the edge of described sheet metal and the internal valve of described housing connect.

Particularly, the position that described housing is relative with the edge of described sheet metal and there is a groove around the edge of described sheet metal, described sheet metal edge is supported mutually with the bottom of described groove.

Particularly, the shape of described sheet metal is corresponding with the cross sectional shape of described housing inner chamber.

More specifically, described anode ear or negative electrode lug and described sheet metal are welded to connect.

Particularly, the cross sectional shape of described housing is circle or polygon.

More specifically, described volume core is stacked volume core or takeup type volume core.

The lithium rechargeable battery that the utility model provides, it by welding the anode ear of battery roll core end or negative electrode lug outside battery container with a conductive metal sheet, afterwards this assembly is sunk to the blind end of battery container, make sheet metal relative with the blind end of housing, by channelling machine, sheet metal is fixed in to enclosure interior again, with lug in prior art, directly in housing, with the shell face welding of housings close end, compare, this kind of structure is converted into visual welding by traditional " blind weldering ", thereby avoided rosin joint, the quality problem such as alopecia areata appear, also can avoid causing occurring spark phenomenon because blind weldering causes lug and bottom contact-making surface out-of-flatness, further, because be visual welding, can greatly improve reliability and the success rate of welding, do over again thereby can reduce, enhance productivity, reduce the manufacturing cost of product, simultaneously, visual welding can improve consistency and the reliability of multi pole ears bottom welding, thereby has guaranteed the balance of the electric current of lithium rechargeable battery

The accompanying drawing explanation

Fig. 1 is the schematic diagram of the lithium rechargeable battery of the prior art that provides of the utility model;

Fig. 2 is the structural representation of the lithium rechargeable battery that provides of the utility model embodiment;

Fig. 3 is the enlarged diagram to the part of the A in Fig. 2 that the utility model embodiment provides.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

The utility model provides a kind of lithium rechargeable battery, as shown in Figure 2, it comprises the tubular metal shell 1 with inner chamber, the insulation spacer 4 of being located at anode ear or the negative electrode lug 2 of volume core 3, end and 3 electric connections of volume core in housing 1 and being located at volume core 3 ends, housing 1 has a blind end 11 and an openend, the sheet metal 5 that the other end of anode ear or negative electrode lug 2 passes through insulation spacer 4 and a conduction is electrically connected, sheet metal 5 is relative with the blind end 11 of housing 1, and the internal valve of the edge of sheet metal 5 and housing 1 connects.The lithium rechargeable battery that the utility model provides, its anode ear or negative electrode lug directly do not weld with housing bottom, but will after anode ear or negative electrode lug and sheet metal electric connection, this integral body be sunk in housing outside housing, and then more described sheet metal is fixed on housing, realize the indirect conducting between anode ear or negative electrode lug and housing, thereby can avoid causing occurring spark phenomenon because blind weldering causes lug and bottom contact-making surface out-of-flatness, also avoid the problem of the failure welding that causes because of " blind weldering "; Further, because it is visual welding, therefore greatly improved efficiency and the reliability of welding, thereby can reduce, do over again, reduce the manufacturing cost of product, the consistency of welding in the time of can also improving the multi pole ears bottom welding and reliability, avoid because of the poor situation that causes the battery charging and discharging current imbalance of blind weldering welding consistency.

Particularly, insulation spacer 4 is located at volume core 3 ends, can prevent that the end face of rolling up core 3 ends from contacting with housing 1, thereby can prevent from rolling up the electrode slice that the interior polarity of core 3 is different from housing 1, with housing, contacts conducting, causes short circuit.

Particularly, as shown in Figures 2 and 3, the position that housing 1 is relative with the edge of sheet metal 5 and there is a groove 12 around the edge of sheet metal 5, the edge of sheet metal 5 is supported mutually with the bottom of groove 12, groove 12 is processed by channelling machine, it pushes sheet metal 5 and housing 1 is fixed by brute force, simultaneously, has also realized indirectly electrically conducting of anode ear or negative electrode lug 2 and housing 1.

For channelling machine is worked adding man-hour more easily, sheet metal 5 is realized to better slot rolling fixation, simultaneously, also for make sheet metal 5 can with housing 1 butt closely, the cross sectional shape of the shape of sheet metal 5 and housing 1 inner chamber is relative should be good; Preferably, the area of sheet metal 5 is slightly less than the area of section of housing 1 inner chamber, thereby can guarantee that sheet metal 5 can more easily sink to the bottom of housing 1, and can slot rolling add man-hour can with housing 1 on groove 12 butt closely.

Particularly, between anode ear or negative electrode lug 2 and sheet metal 5 for being welded to connect, thereby guarantee good conducting property when achieving a fixed connection.

Particularly, the cross sectional shape of housing 1 can be the polygons such as circle, square or pentagon, and correspondingly, housing 1 is cylindrical shape, square tube shape, five multiaspect tubular constructions such as tubular.

Further, volume core 3 can be stacked volume core or takeup type volume core, when volume core 3 is stacked volume core, it is made by " stacked " processing technology, when volume core 3 is rolled up core for takeup type, it is made by " coiling " processing technology, and these two kinds volume cores are volume cored structure form comparatively common in this area, at this, describe in detail no longer one by one.

Further, described housing can adopt stainless steel or aluminium material to make.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace or improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a lithium rechargeable battery, comprise tubular metal shell with inner chamber, be located at volume core in described housing, anode ear or the negative electrode lug of end and the electric connection of described volume core and be located at the insulation spacer of described volume core end, described housing has a blind end and an openend, it is characterized in that, the sheet metal that the other end of described anode ear or negative electrode lug passes through described insulation spacer and a conduction is electrically connected, described sheet metal is relative with the blind end of described housing, and the edge of described sheet metal and the internal valve of described housing connect.

2. lithium rechargeable battery as claimed in claim 1, is characterized in that, the position that described housing is relative with the edge of described sheet metal and there is a groove around the edge of described sheet metal, and described sheet metal edge is supported mutually with the bottom of described groove.

3. lithium rechargeable battery as claimed in claim 1, is characterized in that, the shape of described sheet metal is corresponding with the cross sectional shape of described housing inner chamber.

4. lithium rechargeable battery as claimed in claim 1, is characterized in that, described anode ear or negative electrode lug and described sheet metal are welded to connect.

5. lithium rechargeable battery as claimed in claim 1, is characterized in that, the cross sectional shape of described housing is circle or polygon.

6. as the described lithium rechargeable battery of claim 1-5 any one, it is characterized in that, described volume core is stacked volume core or takeup type volume core.