CN204348846U - A kind of high safe lithium battery - Google Patents

Abstract

The open son of the utility model is a kind of simple and reasonable for structure, makes more stable, the safe and reliable high safe lithium battery of the operation of lithium battery.Comprise and to be reeled the battery core formed by positive/negative plate, be connected to the positive and negative lug of described positive/negative plate, housing and the corresponding block connected to described housing, described block comprises cover plate and O-ring seal, also or comprise cover plate, base plate and corresponding O-ring seal, described positive pole ear is connected between the head end being in the central authorities of described battery core of its positive plate and the base plate central authorities of described block, and described negative lug is connected between the tail end being in the outside of described battery core of its negative plate and the sidewall of housing.

Description

A kind of high safe lithium battery

Technical field

The utility model relates to a kind of lithium battery, particularly relates to a kind of high safe lithium battery.

Background technology

Lithium ion battery has the advantages such as capacity is high, volume is little, lightweight, is thus widely applied.Although along with continuous progress and the development of technology, the various application performance of lithium battery is enhanced.But one of lithium battery applications is compared distinct issues is exactly fail safe.There are positive pole and negative pole in the battery core inside of lithium battery, needs positive pole ear and negative lug the positive pole in battery core and negative pole to be drawn.The positive pole ear that in prior art, the battery core of general lithium battery is arranged respectively and negative lug are all arranged in the middle of winding battery core, and mutually adjacently both it only isolate one deck barrier film, like this because lug is welded to connect, be easy to when pole piece coiling, because of extruding or collision, short circuit phenomenon occurs, load shell time negative lug be directly be crimped on corresponding shell diapire or cause sidepiece, be easy to touch its left and right positive plate when negative lug root is bent and cause short circuit; Simultaneously, when battery makes, corresponding lug arranges insulation glue-line, usual prior art pastes two panels adhesive tape in the relative both sides of lug sheet to pressure viscosity, the two ends of its separate two panels adhesive tape are pasted mutually, this syndeton one is that its lug only has the relative two plate faces of pole piece to be connected with adhesive tape, its relative both sides side wall surface and adhesive tape Existential Space, effective connection area between lug and two panels adhesive tape is few, two is that two panels adhesive tape is easily peeled off, this all can cause lug exposed, and the problem such as be short-circuited.

In addition in prior art; when cell package, its potting cushion rubber is crimped on explosion-proof protective cover cap by limit, upper end separately, and then the limit, upper end of shell is crimped on O-ring seal; this its shell of the connected mode be separated disconnects mutually with cover plate, and cover plate is easily loosened.

Moreover, existing explosion-proof protective cover cap, its laser weld tabs and burst disk are by together with laser welding, and solder joint is two round dots protruded, and the area of contact position two boss is little, when this will make assembling overlap and contraposition inaccurate, easily cause sealing part to pull; And laser weld tabs is connected by two solder joints with two contact-making surfaces of burst disk, affects heavy-current discharge; Meanwhile, because laser solder joint is little, explosion-proof blade is thinner again, strictly must control, otherwise easily causes rosin joint, affect product qualified rate during spot weld operation.

Utility model content

The purpose of this utility model is the deficiency existed for above-mentioned prior art, provides a kind of high safe lithium battery.This high safe lithium battery is simple and reasonable for structure, makes the operation of lithium battery more stable, safe, reliable.

The technical solution of the utility model comprises and to be reeled the battery core formed by positive/negative plate, be connected to the positive and negative lug of described positive/negative plate, housing and the corresponding block connected to described housing, described block comprises cover plate and O-ring seal, also or comprise cover plate, base plate and corresponding O-ring seal, described positive pole ear is connected between the head end being in the central authorities of described battery core of its positive plate and the base plate central authorities of described block, and described negative lug is connected between the tail end being in the outside of described battery core of its negative plate and the sidewall of housing.

The utility model height safe lithium battery optimizes the syndeton of corresponding pole piece and lug, housing and the syndeton of block and the burst disk structure of block, each connecting portion connects reliable, the technique that the lug of battery core and burst disk boss face are welded to each other simply, easily controls, add the contact area of lug spot welding, make the mistake good in thermal property of battery; Link is few, and burst disk and cover plate corresponding site are superimposed with each other to be wrapped up by the corresponding position of O-ring seal and are connected and fixed; Burst disk and positive pole cover plate contact area increase, and improve the security performance of battery.

Fig. 1 is the utility model one example structure schematic diagram.Fig. 2 is O-ring seal in Fig. 1 and metal shell syndeton schematic diagram.Fig. 3 is the positive-negative plate structure schematic diagram in another embodiment of the utility model.Fig. 4 is the utility model example structure schematic diagram again.

Embodiment

For understanding the technical solution of the utility model further, existing by embodiment, also the utility model is described in further detail by reference to the accompanying drawings.

As shown in Figure 1, the novel lithium battery of the present embodiment comprises the battery core 10 be made up of the mutual stacked winding of positive plate 16, barrier film and negative plate 17, be connected to the positive and negative lug 6 and 7 of positive/negative plate 16 and 17, metal shell 8, and to the corresponding block 9 stated metal shell 8 and connect.Described barrier film is Ceramic Composite barrier film, and its Ceramic Composite barrier film comprises diaphragm body, and described diaphragm body comprises barrier film basic unit and is located at the ceramic material layer in this barrier film basic unit.

Block 9 comprise base plate 14, burst disk 2 and O-ring seal 3, the inner circumferential sidewall of O-ring seal 3 is provided with a ring groove 3a, and the plastic cement cylindrical shell upper and lower side of ring groove 3a is formed to the bending of corresponding direction.The respective face of burst disk 2 convexes to form a boss face 2a protruded to direction inside battery core 10 toward side, the surrounding main body wall of boss face 2a and burst disk 2 is interconnected by inclined wall 2b.Its inclined wall 2b relatively increases the boss face area of burst disk 2, has better protected effect.

The burst disk 2 of block 9 is between cover plate 1 and base plate 14, burst disk 2, cover plate 1 and base plate 14 are placed in the ring groove 3a of O-ring seal 3 from its outer peripheral portion respectively, by the ring groove 3a of O-ring seal 3 by base plate 14, burst disk 2 and cover plate 1 from corresponding outer peripheral portion divide be interconnected and by O-ring seal 3 formed seal fixing.Block 9 and the connection of metal shell 8 be the corresponding upper periphery of the upper periphery of O-ring seal 3 plastic cement cylindrical shell and metal shell 8 mutual stacked while be crimped on the surrounding upper wall surface (as shown in Figure 3) of cover plate 1 to inward side to bending.Its connection not easily loosens, structure is more reliable and stable.The ring groove 3a upper corner internal face of O-ring seal 3 is provided with the annular buckle convex body 3b corresponding with cover plate 1 upper wall surface edge.It has spacing fastening effect well.

The positive pole ear 6 of battery core 10 is connected to the head end of the pole piece coiling of positive plate 16, and it is in the central authorities of battery core 10; Negative lug 7 is connected to the tail end of the pole piece coiling of negative plate 17 relative to positive pole ear 6, it is in the outside by battery core 10.The diapire central authorities of the base plate 14 of block 9 offer a lug guide hole 15, and the positive pole ear 6 of battery core 10 connects guide hole 15 laser spot welding from its convex section by lug simultaneously and is directly connected with the boss face 2a of burst disk 2; On the bottom wall edge that the negative lug 7 of battery core 10 is directly connected in corresponding housing from its wall simultaneously and/or sidewall.The fail safe that its lug connects is higher, relatively takies volume little.

The corresponding site of positive pole ear 6 and negative lug 7 is respectively equipped with insulating barrier, and its insulating barrier is that a slice is directly wound around and is pasted on positive pole ear 6 and pastes with the mutual head and the tail in four peripheral wall surfaces of negative lug 7 adhesive tape 18 be connected.Its lug and only very close to each other between a slice adhesive tape and dead band, effective connection area of lug and adhesive tape is large, has very high connection reliability and fail safe.

Another embodiment of the utility model as shown in Figure 3, cathode pole piece 17 is provided with two negative lug 7.Two negative lug 7 are arranged at the opposite end of negative plate 17 respectively, form the be placed in relative both sides of battery core of its two negative lug after battery core be connected in the middle of corresponding housing and on a corresponding side wall surface at pole piece coiling.Negative plate is arranged two lugs when same material and volume, its lithium battery internal resistance can significantly reduce, the corresponding increase of lithium battery discharge-rate, makes lithium battery have relatively larger power output.All the other structures of this example etc. can with above-described embodiment roughly the same.

A utility model again embodiment as shown in Figure 4, is provided with elastic insert 13 between the upper end of the block upper wall surface of 9 or the external wall of upper portion face of flanging and metal shell 8 or flanging internal face.When temperature raises and produces and expand, there is certain flame proof cushioning effect.And its syndeton shock resistance is strong, structure is more reliable and stable.All the other structures of this example etc. can with above-mentioned any embodiment roughly the same.

In the another embodiment of the utility model, block comprises burst disk and cover plate, burst disk and cover plate are placed in the ring groove of O-ring seal from its outer peripheral portion respectively, by the ring groove of O-ring seal by burst disk and cover plate from corresponding outer peripheral portion divide be interconnected and by O-ring seal formed seal fixing.All the other structures of this example etc. can with above-mentioned any embodiment roughly the same.

Other modified products based on the technical solution of the utility model all belong to protection range of the present utility model; Above-described embodiment is not the exhaustive of embodiment of the present utility model.

Claims (1)

1. a high safe lithium battery, comprise and to be reeled the battery core formed by positive/negative plate, be connected to the positive and negative lug of described positive/negative plate, housing and the corresponding block connected to described housing, described block comprises cover plate and O-ring seal, also or comprise cover plate, base plate and corresponding O-ring seal, it is characterized in that described positive pole ear is connected between the head end being in the central authorities of described battery core of its positive plate and the base plate central authorities of described block, described negative lug is connected between the tail end being in the outside of described battery core of its negative plate and the sidewall of housing.