CN201450079U

CN201450079U - Cylinder type lithium ion battery core

Info

Publication number: CN201450079U
Application number: CN2009200578995U
Authority: CN
Inventors: 曾建华; 胡常青; 周清; 朱燕飞
Original assignee: ZHUHAI HANGE BATTERY TECH CO LTD
Current assignee: ZHUHAI HANGE BATTERY TECH CO LTD
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-05-05
Anticipated expiration: 2019-06-05

Abstract

The utility model discloses a cylinder type lithium ion battery core. The cylinder type lithium ion battery core comprises a housing, a positive pole winding core and a negative pole winding core, wherein the housing is formed by reeling a aluminum-plastic composite membrane with a double-circular arc groove, the positive pole winding core and the negative pole wingding core are located in the double-circular arc groove, the positive pole winding core is formed in the way that a positive pole base wraps an aluminium tab, the negative pole winding core is formed in the way that a negative pole base wraps a nickel tab, and the aluminium tab and the nickel tab are respectively as aluminium sheet and a nickel sheet, both surfaces of which are compounded with a tab rubber. According to the utility model, the battery core is sealed in the way that the resin on the tab and the resin in the internal layer of the aluminum-plastic composite membrane are intermiscible, thus the liquid leakage ratio and the production disability rate of the cylinder type lithium ion battery core are low, the energy of the battery is high, the safety is good, compared with the conventional steel casing and aluminium casing encapsulated cylinder type lithium ion battery, a large number of mould-opening expenditure and time can be saved.

Description

A kind of cylinder type lithium ion battery cell

Technical field:

The utility model relates to the battery technology field, especially relates to the cylinder type lithium ion battery cell technical field.

Background technology:

Traditional small diameter cylinders lithium ion battery cell employing box hat or aluminum hull are as the case material of battery, seal and adopt mechanical presses sealing or laser welded seal, have leakage rate height, produce the scrappage height, problems such as poor safety performance are not suitable for using in some miniature electric consumer goods.

The utility model content:

The purpose of this utility model is to provide a kind of new cylinder type lithium ion battery cell, to solve existing cylinder type lithium ion battery cell leakage rate that exists and the problem of producing scrappage height, poor stability.

For achieving the above object, cylinder type lithium ion battery cell of the present utility model includes shell, anodal volume core and negative pole volume core, and described shell is reeled by the aluminum-plastic composite membrane with two arc grooves and formed, and anodal volume core and negative pole volume core are positioned at two arc grooves; Anodal volume core is made of anodal base stage metallized aluminum lug, and negative pole volume core coats the nickel lug by the negative pole base stage and constitutes, and aluminium pole ears and nickel lug then are respectively two-sided aluminium flake and the nickel sheet that is compounded with lug glue.

Described aluminum-plastic composite membrane has 3～7 layers layer structure, its thickness is 110um～260um, wherein containing a layer thickness at least is linear low-molecular polypropylene class or the polythylene resin of 30um～100um, one layer thickness is the nylon of 30um～60um, and a layer thickness is the function of glue coating of 5um～20um.

The beneficial effects of the utility model are: because the sealing of battery battery core is to realize by the resin of resin on the lug and plastic-aluminum combined film inner layer is fused mutually, make that the leakage rate of cylinder type lithium ion battery cell and production scrappage are low; Battery quality specific energy height, high safety is good; Compare with the cylindrical lithium ion battery of aluminum hull encapsulation with traditional box hat, can save a large amount of die sinking expenses and die sinking time.

Description of drawings:

Below in conjunction with accompanying drawing the utility model is described further:

Accompanying drawing 1 is the schematic diagram of a plurality of aluminium pole ears that link together and nickel lug;

Accompanying drawing 2 is for cutting into the aluminium pole ears and the nickel lug schematic diagram of monomer shape;

Accompanying drawing 3 is the connection diagram of aluminium pole ears and anodal base stage;

Accompanying drawing 4 is the connection diagram of nickel lug and negative pole base stage;

Accompanying drawing 5 is for being used for the mould structure schematic diagram of punching press aluminum-plastic composite membrane;

Accompanying drawing 6 is for having the aluminum-plastic composite membrane end view of two arc grooves;

Accompanying drawing 7 is for having the aluminum-plastic composite membrane vertical view of two arc grooves;

Accompanying drawing 8 is positive pole (negative pole) the volume core schematic diagram after reeling;

Accompanying drawing 9 is put into the electric core schematic diagram that obtains after aluminum-plastic composite membrane seals for the volume core;

Accompanying drawing 10 carries out electric core schematic diagram after the vacuum-pumping and sealing for side;

Accompanying drawing 11 is the electric core schematic diagram behind the unnecessary aluminum-plastic composite membrane of excision;

Accompanying drawing 12 is a finished product electricity core schematic diagram of the present utility model.

Embodiment:

Therefore the following stated only for embodying the preferred embodiment of the utility model principle, does not limit protection range of the present utility model.

Battery battery core of the present utility model includes shell, anodal volume core and negative pole volume core, and shell is reeled by the aluminum-plastic composite membrane with two arc grooves and formed, and anodal volume core and negative pole volume core are positioned at two arc grooves; Anodal volume core is made of anodal base stage metallized aluminum lug, and negative pole volume core coats the nickel lug by the negative pole base stage and constitutes, and aluminium pole ears and nickel lug then are respectively two-sided aluminium flake and the nickel sheet that is compounded with lug glue.

Be 7.5mm below with the diameter, length is that the cylinder type lithium ion battery cell of 40.0mm is that example illustrates manufacture method of the present utility model and core strueture.

The aluminum-plastic composite membrane that this battery battery core employing thickness is (113 ± 2) um is as sheathing material.

See shown in the accompanying drawing 1: at first, selecting width for use is 2.0mm, and thickness is the aluminium strip (nickel strap) of 0.10mm, and the disconnected aluminium flake (nickel sheet) that is cut into equal in length carries out oil removing, decontamination processing, carries out surface oxidation-resistant, anticorrosive and cleaning and dried then.Selecting width for use is 5.0mm, and thickness is the binary composition lug glue of (0.10 ± 0.01) mm, is fixed in aluminium flake (nickel sheet) tow sides by hot pressing, and natural cooling is made into a plurality of aluminium pole ears that link together or nickel lug 10 (20).

See shown in the accompanying drawing 2: after the lug preparation finishes, cut into the monomer shape; Afterwards, see shown in accompanying drawing 3 and the accompanying drawing 4: the mode by supersonic welding or electric resistance welding or Laser Welding with nickel lug 20 and negative pole matrix 21 firm welding, obtains positive plate and negative plate with aluminium pole ears 10 and anodal matrix 11 firm welding.

Employing has the arc structure mould that diameter is 6.5mm (seeing accompanying drawing 5) punching press aluminum-plastic composite membrane 30, obtains having the aluminum-plastic composite membrane (seeing accompanying drawing 6 and accompanying drawing 7) of two arc grooves 31.

See shown in the accompanying drawing 8: positive plate and negative plate are placed on the special equipment reel, obtain anodal volume core and negative pole volume core 40 (50).

Positive pole that resistance is qualified volume core 40 and negative pole volume core 50 are put into the aluminum-plastic composite membrane 30 with two arc grooves 31, carry out both ends of the surface and seal, and sealing temperature is (180 ± 5) ℃, and pressure is 3kgf/cm ², the time of sealing is 3S, the electric core 60 after sealing is as shown in Figure 9.

The electricity core injects a certain amount of Li that contains after baking ⁺Electrolyte, shelve a period of time and carry out laggard line precharge, after preliminary filling finishes, shelve a period of time, electric core side is carried out vacuum-pumping and sealing, see shown in the accompanying drawing 10.Excise the electric core 60 of unnecessary aluminum-plastic composite membrane 30 and see shown in the accompanying drawing 11 that the electric core of finished product then as shown in Figure 12.

Claims

1. cylinder type lithium ion battery cell, it includes shell, anodal volume core and negative pole volume core, it is characterized in that: described shell is reeled by the aluminum-plastic composite membrane with two arc grooves and is formed, and anodal volume core and negative pole volume core are positioned at pair arc grooves; Anodal volume core is made of anodal base stage metallized aluminum lug, and negative pole volume core coats the nickel lug by the negative pole base stage and constitutes, and aluminium pole ears and nickel lug then are respectively two-sided aluminium flake and the nickel sheet that is compounded with lug glue.

2. cylinder type lithium ion battery cell according to claim 1, it is characterized in that: described aluminum-plastic composite membrane has 3～7 layers layer structure, its thickness is 110um～260um, wherein containing a layer thickness at least is linear low-molecular polypropylene class or the polythylene resin of 30um～100um, one layer thickness is the nylon of 30um～60um, and a layer thickness is the function of glue coating of 5um～20um.