CN203377274U

CN203377274U - Lithium ion secondary battery

Info

Publication number: CN203377274U
Application number: CN201320451695.6U
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 case, a roll core, a positive pole tab or a negative pole tab, and an insulating washer, wherein the cylindrical metal case is provided with an inner cavity, the roll core is arranged in the case, the positive pole tab or the negative pole tab is guided out from the end of the roll core, the insulating washer is arranged at the end of the roll core, a bottom case is arranged at the end of the case, an opening is formed in the bottom case, and the other end of the case is an open end; the other end of the positive pole tab or the negative pole tab is electrically connected with a conductive metal cover plate after sequentially penetrating through the insulating washer and the opening of the bottom case, the metal cover plate covers the opening of the bottom case. According to the lithium ion secondary battery, the problems that the battery with an aluminum cylindrical case with two through ends in the prior art is low in pass percent and high in cost can be solved, and the steel case with openings at two ends in the prior art can also be thinner, so that more materials can be saved; furthermore, the problem that blind welding between the closed end of the case and the tab in the prior art causes poor welding reliability and low production efficiency is also solved.

Description

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

The metal shell of existing lithium rechargeable battery has following several types usually: the square tube body that two ends connect or cylinder, an end seal five cylindrical shells of an end opening or cylinder or the square tube body that an end seals an end opening.Metal shell for aluminum, because of the aluminium quality softer, stress deformation very easily, therefore, be subject to the restriction of material and processes difficulty, with existing aluminum hull processing, usually by drawing process, process, the square tube body that the two ends that the manufacture shell is aluminum connect or the lithium rechargeable battery of cylinder, its qualification rate is lower, production cost is higher; The housing that the two ends that process connect, when follow-up welding, because housing is yielding, thereby can cause the seal cover board of housing port to be difficult for aliging with the edge of port, very easily misplaces, thereby directly affect the seal welding of housing.

Housing for end opening one an end sealing of aluminum or steel, follow-up when lug directly is welded on to the blind end of housing, due to the housing bottom blind end that is cylindrical body, can't see and look at all when welding, be " 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 or cause the phenomenon of bottom protrusion, corrosion, thus this welding manner poor reliability, the battery poor reliability produced; And during blind weldering, because the control difficulty of lug and bottom contact-making surface planarization is high, be easy to cause spark phenomenon, have 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.

For the metal shell of existing steel or aluminum, keep certain intensity for making housing, not yielding, need do thicklyer by housing, this objectively will increase the manufacturing cost of product, simultaneously also can the decrease of power density.

The utility model content

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of lithium rechargeable battery of aluminium casing of both ends open is provided, and this kind of structure can be avoided blind weldering, and its production efficiency is high while being produced in batches, production cost is low.

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, anode ear or the negative electrode lug of being drawn by described volume core end in described housing and the insulation spacer of being located at described volume core end, described shell end has a drain pan, offer an opening on described drain pan, the other end of described housing is open end; The metal cover board that the other end of described anode ear or negative electrode lug passes through described insulation spacer and described drain pan opening and a conduction successively is electrically connected, and described metal cover board is covered on described drain pan opening.

Particularly, described anode ear or negative electrode lug and described metal cover board are welded to connect.

Particularly, described volume core is stacked volume core or takeup type volume core.

More specifically, described drain pan opening is circle, ellipse or polygon, and described metal cover board should be circle, ellipse or polygon mutually.

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

More specifically, described anode ear or negative electrode lug are at least one.

The lithium rechargeable battery that the utility model provides, it by offering an opening on the integrated barrel-type casing with blind end and openend, this opening is opened on the blind end of this housing, the lug that volume core end is drawn is welded on a metal cover board from described housings close end opening passes, then this metal cover board is covered on this housings close end opening, thereby solved in the prior art, produces the problem that aluminum barrel-type casing qualification rate is lower, production cost is higher that two ends connect in enormous quantities; And the steel barrel-type casing connected with respect to two ends of the prior art, this kind of structure is because the sidewall of blind end opening and housing has one " shirt rim ", thereby can form centripetal-stress to the sidewall of housing, housing sidewall is had to certain supporting role, thereby can do thinlyyer by housing, more save material; Middle lug and an end seal the mode that the blind end of the housing of an end opening carries out " blind weldering " compared to existing technology, because its lug is in outside and metal cover board welding, are visual welding, therefore can greatly improve welding quality and welding efficiency; Moreover, the consistency of welding when visual welding can improve the multi pole ears bottom welding and reliability, avoid the poor situation that causes the battery charging and discharging current imbalance of welding consistency caused because of blind weldering, thereby cause the disequilibrium of gathering at multi pole ears place electric current, the product and the design parameter that produce differ greatly.

The accompanying drawing explanation

Fig. 1 is the structural representation of the lithium rechargeable battery that provides of the utility model embodiment mono-;

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

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 1-2, comprise the tubular metal shell 1 with inner chamber, the insulation spacer (not shown) of being located at the volume core 2 in housing 1, anode ear or the negative electrode lug 3 of being drawn by volume core 2 ends and being located at volume core 2 ends, housing 1 has a drain pan 11, sidewall 12 one of itself and housing process, offer an opening 110 on drain pan 11, the other end of housing 1 is open end; The metal cover board 4 that the other end of anode ear or negative electrode lug 3 passes through insulation spacer and drain pan opening 110 and a conduction successively is electrically connected, and metal cover board 4 is covered on drain pan opening 110.Its structural stability of this lithium rechargeable battery is good, simultaneously, and because its anode ear or negative electrode lug are electrically connected with metal cover board outside housing, therefore can avoid the problem such as rosin joint; Simultaneously, have a sealing " shirt rim " between sidewall due to drain pan opening and housing, this " shirt rim " has certain centripetal application to the sidewall of housing, thereby has certain constraint supporting role for whole housing, make it not produce easily distortion, thereby can solve the problem that the aluminium casing both ends open easily produces deformation, and for steel shell, due to the supporting role of " shirt rim ", compare the mode that two ends connect, it can do thinlyyer, thereby more saves material, and cost performance is higher.

Particularly, insulation spacer 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.

Anode ear or negative electrode lug 3 are with metal cover board 4 for being welded to connect, and it,, when guaranteeing to make anode ear or negative electrode lug 3 be fixedly connected on metal cover board 4, also guarantees to have good conducting property between anode ear or negative electrode lug 3 and metal cover board 4.

Further, volume core 2 be stacked volume core or takeup type volume core, and embodiment as shown in Figure 1, be the example that takeup type is rolled up core, and embodiment as shown in Figure 2 is the example of stacked volume core; Stacked volume core adopts above-mentioned " stacked " processing technology, and takeup type volume core adopts above-mentioned " coiling " processing technology, and these two kinds volume cores are the volume cored structure commonly used in this area, in this not fine elaboration.

Particularly, drain pan opening 110 can be circle, ellipse, as shown in Figure 1, be the example of a circular base shell opener, it also can be polygon, as shown in Figure 2, be the example of a square base shell opener, correspondingly, metal cover board 4 is complementary with drain pan opening 110, can correspond to circle, ellipse or polygon.

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

Further, anode ear or negative electrode lug 3 can be one, also can be a plurality ofly, and when anode ear or negative electrode lug 3, while being a plurality of, this lithium rechargeable battery is high power battery.

These are 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, anode ear or the negative electrode lug of being drawn by described volume core end in described housing and the insulation spacer of being located at described volume core end, it is characterized in that, described shell end has a drain pan, offer an opening on described drain pan, the other end of described housing is open end; The metal cover board that the other end of described anode ear or negative electrode lug passes through described insulation spacer and described drain pan opening and a conduction successively is electrically connected, and described metal cover board is covered on described drain pan opening.

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

3. lithium rechargeable battery as claimed in claim 1, is characterized in that, described volume core is stacked volume core or takeup type volume core.

4. lithium rechargeable battery as claimed in claim 1, is characterized in that, described drain pan opening is circle, ellipse or polygon, and described metal cover board should be circle, ellipse or polygon mutually.

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 anode ear or negative electrode lug are at least one.