CN202839866U

CN202839866U - Novel square battery

Info

Publication number: CN202839866U
Application number: CN2012205185246U
Authority: CN
Inventors: 徐建贞; 朱玉法; 柳艾美; 孟庆帅
Original assignee: SHANDONG TIANYANG NEW ENERGY CO Ltd
Current assignee: SHANDONG TIANYANG NEW ENERGY CO Ltd
Priority date: 2012-10-11
Filing date: 2012-10-11
Publication date: 2013-03-27
Anticipated expiration: 2022-10-11

Abstract

The utility model belongs to the field of lithium ion batteries and in particular relates to a novel square battery. The technical scheme is as follows: the novel square battery consists of a rectangular shell, a cover plate and a roll. The cover plate consists of an anode current collecting column, a cathode current collecting column, an anti-explosion valve and an insulating piece. The roll is placed in the shell, and the anode lug and cathode lug of the roll are respectively connected with the anode current collecting column and the cathode current collecting column of the cover plate. The roll consists of a plurality of roll units of same specifications. The exteriors of the roll units are clamped by a roll assistant module and arranged, fixed and placed in the shell. According to the square lithium ion battery provided by the utility model, the cylindrical rolled cell is adopted, so that pole pieces are uniform in gaps and degree of tightness, and the production efficiency is high. The roll assistant module can support and protect the roll, so that the mechanical strength and safety of the novel square battery can be improved. The capacity of the battery can be increased by increasing the number of the roll units. The anode and cathode current collectors are not contacted with the shell, and the battery shell is electrically neutral, so that the using safety is improved.

Description

A kind of Novel square battery

Technical field

The utility model belongs to the rectangular lithium ion battery in lithium ion battery field, particularly Small And Medium Capacity.

Background technology

Lithium ion battery has been applied to the fields such as energy storage and power more and more with its high voltage, high-energy-density, the good advantages such as cycle performance.The lithium ion battery of at present common metal shell mainly contains cylindrical battery and rectangular cell two large classes.

The battery core of cylindrical battery is taked takeup type production.Coiled advantage mainly contains: (1) takeup type technical maturity is stable, and cost is low, and production efficiency is high.(2) the pole piece gap is even, high conformity.(3) the pole piece radius of curvature is large, and pole piece is difficult for falling material.These advantages are widely used winding process.Just take winding process such as 18650,26650 common cylindrical batteries such as grade.But winding process also has its limitation, can not do greatly such as capacity, and reason is that the coiling difficulty increases, rolls up degradation unfavorable factor appearance under the core degree of registration when pole piece is long.

Rectangular cell mainly is divided into two kinds: square takeup type and square laminated plates formula.The advantage of rectangular cell is that capacity is larger, but compare rectangular cell from the cylinder coiled battery its shortcoming is also arranged: the different pole piece gaps that cause, each position of (1) square coiled volume core radius of curvature are inhomogeneous, at the little place of volume core radius of curvature, the pole piece gap is little, falls easily material.This inconsistency can affect the performance of battery performance.(2) shortcoming of square laminated plates formula is complex process, and production cost is high, efficient is low.

Summary of the invention

The purpose of this utility model is the problem that exists for prior art, and a kind of Novel square battery that combines the advantage of cylindrical battery and rectangular cell is provided.

Its technical scheme is: a kind of rectangular lithium ion battery, formed by rectangle housing, cover plate and volume core, and cover plate is comprised of anode collection post, negative pole currect collecting post, explosion-proof valve and insulating trip; The volume core places in the housing, and anode ear, the negative electrode lug of volume core are connected with anode collection post, the negative pole currect collecting post of cover plate respectively; The volume core is that the volume core unit of a plurality of same specifications forms, and a plurality of volume core units outside is arranged by the clamping of volume core supplementary module and fixedly is placed in the housing.

Such scheme also comprises: described volume core unit is cylindrical takeup type structure, and volume core anode ear, negative electrode lug are separately positioned on the two ends of cylindrical roll core; Described volume core supplementary module is that two volume core supplementary modules are along the axially rectangle overall structure to being combined into of volume core, its outside and rectangular housing is pegged graft and is cooperated, inside is provided with and the cylindrical groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.

Described volume core unit is cylindrical takeup type structure, and volume core anode ear, negative electrode lug are separately positioned on the two ends of cylindrical roll core; Described volume core supplementary module is that two volume core supplementary modules are along the rectangle overall structure of neighboring to being combined into of volume core, its outside and rectangular housing is pegged graft and is cooperated, inside is provided with and the arc groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.Two volume core supplementary modules comprise upper and lower butted structure or left and right butted structure along the involutory mode in neighboring of rolling up core.

Volume core supplementary module after involutory arranges respectively plus plate current-collecting body, negative current collector in anode ear, negative electrode lug joint portion with cylindrical roll core two ends, the equal correspondence of anode ear, negative electrode lug of each volume core unit is connected on plus plate current-collecting body, the negative current collector, and plus plate current-collecting body, negative current collector are pegged graft respectively and be fixed on end corresponding to volume core supplementary module.

Plus plate current-collecting body, negative current collector are connected with anode collection post, the negative pole currect collecting post of cover plate respectively, and between its connecting portion the collector isolation module are set.The collector isolation module is the notch of middle with hole.

Rectangular lithium ion battery of the present utility model, employing be the combination of the coiled volume core unit of cylinder, have the advantage of cylinder takeup type battery core, the combination of rolling up simultaneously core unit has broken through the bottleneck of cylinder takeup type battery capacity.Wherein: the volume core is to be combined by several volume core units, and each volume core unit is identical, and what all take is cylinder takeup type structure, and the number that increases the volume core unit can increase the capacity of rectangular cell; The volume core is protected and supported to volume core supplementary module effectively, and used metal shell thickness requirement is reduced; Plus plate current-collecting body and negative current collector by collector isolation module and the isolation of volume core, can guarantee that shell is not charged by insulating trip and the cover plate isolation of cover plate like this, improve the safety in utilization of battery.

Description of drawings

Fig. 1 is a kind of overall schematic of Novel lithium ion cell in square.

Fig. 2 a is a kind of vertically right view of involutory volume core supplementary module, and Fig. 2 b is a kind of vertically front view of involutory volume core supplementary module, and Fig. 2 c is a kind of vertically vertical view of involutory volume core supplementary module.

Fig. 3 is another kind of along the involutory volume core supplementary module installation diagram in the volume left and right sides, core neighboring.

Fig. 4 is the three-view diagram of collector isolation module 4.

Embodiment

Below in conjunction with accompanying drawing; the technical solution of the utility model is clearly and completely described; obviously; described embodiment only is the present invention's part embodiment; rather than whole embodiment; based on embodiments of the invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belongs to the scope of protection of the invention.

A kind of rectangular lithium ion battery forms the cuboid external packing by housing 10, cover plate 1; Be provided with the anode collection post and negative pole currect collecting post 2, explosionproof hole 3(take into account liquid injection port at cover plate 1), insulating trip 5; Volume core supplementary module (6 or 6 ') and volume core 8 are set in housing 10 inside, are connected with both positive and negative polarity current-collecting pole 2 after the positive and negative lug 7 of volume core 8 is connected to both positive and negative polarity collector 11.Wherein:

Housing 10 materials are aluminum hull, and thickness is 0.25-0.5mm.

Anode collection post and negative pole currect collecting post 2 length in the cover plate 1 are shorter, can reduce the bulk of battery.The insulating trip effect is that cover plate and positive and negative electrode collector are kept apart.

Volume core 8 is to be combined by several volume core units, and each volume core unit is identical, and what all take is that cylinder takeup type technique is made.Cylinder takeup type technical maturity is stable, can effectively guarantee battery performance and quality.The number that increases the volume core unit can increase the capacity of rectangular cell.Preferably, take 2 to 4 of the numbers of volume core unit are the best.

Volume core supplementary module can be divided into two kinds according to the structure difference, and is a kind of along rolling up mandrel to involutory structure, shown in Fig. 2 a-2c.Another kind be along volume core neighboring involutory about or up-down structure, as shown in Figure 3.Number difference according to protection volume core unit is divided into two kinds, and a kind of is single volume core protection, and another kind is a plurality of volume core protections.The preferred Fig. 2 a-2c of present embodiment and volume core

supplementary module

6 and 6 shown in Figure 3 ' describe.

The core supplementary module of volume shown in Fig. 2 a-2c be by two identical volume core supplementary modules 6 along the volume cores axially to being combined into.The volume core is protected and supported in act as (1) of this module.(2) auxiliary electrolyte infiltrates the volume core.Volume core supplementary module is the PP material, adds fire retardant and glass fibre, improves security performance and mechanical strength, can effectively protect and support battery core.The involutory surface of volume core supplementary module 6 is provided with projection 6-2 and shrinkage pool 6-1.To roll up core 8 after projection 6-2 and shrinkage pool 6-1 grafting cooperation achieve a butt joint is fixed therein.At the default groove 6-3 of the outside stile of volume core supplementary module 6, peg graft and draw the passage of volume core lug as plus plate current-collecting body and negative current collector.Also being provided with bar shaped hole slot 6-4(on volume core supplementary module 6 is 9 among Fig. 1), be the passage that electrolyte infiltrates the volume core.Be shaped with in advance deep-slotted chip breaker in volume core supplementary module 6 inside, be used for the assembling of cylindrical roll core unit and fixing.

Volume core supplementary module shown in Figure 3 be by two identical volume core supplementary modules 6 ' along the volume core the neighboring about to being combined into.The mode of its structure and connected mode and volume core supplementary module 6 is similar.

With reference to Fig. 4, collector isolation module 4 is comprised of the draw-in groove of middle with hole, and its effect is: will roll up the anode collection of core and negative pole currect collecting and volume core and keep apart.Middle aperture is the passage that electrolyte infiltrates the volume core.

The both positive and negative polarity collector is connected the both positive and negative polarity current-collecting pole and is taked the form of laser welding or ultrasonic bonding to connect with lug.

For the above-mentioned explanation of the disclosed embodiments, only be preferred embodiment of the present invention, be not to limit practical range of the present invention.Be that every equivalence of doing according to the content in the present patent application claim changes and modification, all should be technology category of the present invention.

Claims

1. a Novel square battery is comprised of housing, cover plate and volume core, and cover plate is comprised of anode collection post, negative pole currect collecting post, explosion-proof valve and insulating trip; The volume core places in the housing, and anode ear, the negative electrode lug of volume core are connected with anode collection post, the negative pole currect collecting post of cover plate respectively, and it is characterized in that: housing is the cuboid cavity structure; The volume core is that the volume core unit of a plurality of same specifications forms, and a plurality of volume core units outside is arranged by the clamping of volume core supplementary module and fixedly is placed in the housing.

2. Novel square battery according to claim 1, it is characterized in that: described volume core unit is cylindrical takeup type structure, volume core anode ear, negative electrode lug are separately positioned on the two ends of cylindrical roll core; Described volume core supplementary module is that two volume core supplementary modules are along the axially rectangular structure to being combined into of volume core, its outside pegging graft with the housing of cuboid cooperates, inside is provided with and the cylindrical groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.

3. Novel square battery according to claim 1, it is characterized in that: described volume core unit is cylindrical takeup type structure, volume core anode ear, negative electrode lug are separately positioned on the two ends of cylindrical roll core; Described volume core supplementary module is that two volume core supplementary modules are along the rectangular structure of neighboring to being combined into of volume core, its outside pegging graft with the housing of cuboid cooperates, inside is provided with and the arc groove of rolling up core and pegging graft and to cooperate, two volume core supplementary modules are provided with projection and the groove that mutual grafting cooperates at its involutory surface, and volume core supplementary module is provided with inside and outside through hole or the groove that connects.

4. Novel square battery according to claim 3 is characterized in that: roll up the core supplementary modules for two and comprise upper and lower butted structure or left and right butted structure along the involutory mode in neighboring of rolling up core.

5. according to claim 2,3 or 4 described Novel square batteries, it is characterized in that: the volume core supplementary module after involutory arranges respectively plus plate current-collecting body, negative current collector in anode ear, negative electrode lug joint portion with cylindrical roll core two ends, the equal correspondence of anode ear, negative electrode lug of each volume core unit is connected on plus plate current-collecting body, the negative current collector, plus plate current-collecting body, negative current collector are pegged graft respectively and are fixed on end corresponding to volume core supplementary module, and plus plate current-collecting body, negative current collector are connected with anode collection post, the negative pole currect collecting post of cover plate respectively.

6. Novel square battery according to claim 5, it is characterized in that: the collector isolation module is set between its connecting portion, and the collector isolation module is the notch of middle with hole.