CN206250307U

CN206250307U - A kind of chargeable lithium ion button cell

Info

Publication number: CN206250307U
Application number: CN201621293590.2U
Authority: CN
Inventors: 王昉; 孙法炯
Original assignee: Zhuhai Power Battery Co Ltd
Current assignee: Zhuhai Power Battery Co Ltd
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2017-06-13
Anticipated expiration: 2026-11-29

Abstract

The utility model discloses a kind of chargeable lithium ion button cell, it is desirable to provide a kind of simple structure, electric conductivity be high and class charged lithium ion button cell of long service life.The utility model includes seal casinghousing, electrode, electrolyte and barrier film；The seal casinghousing includes being provided with insulation cushion rubber between inner cap and shell and the inner cap and the shell, and the insulation cushion rubber includes a pin side and a stile；The electrode includes first electrode and second electrode, the first electrode is provided with the first conductive lug, the second electrode is provided with the second conductive lug, described first conductive lug is electrically connected with by sheet metal with shell, the sheet metal in the outer casing bottom with the pin side outside between, described second conductive lug is electrically connected with the inner cap top, and metal foil is provided between the sheet metal in the outer casing bottom.The utility model is applied to the technical field of rechargeable battery.

Description

A kind of chargeable lithium ion button cell

Technical field

The utility model is related to a kind of battery, more particularly to a kind of chargeable lithium ion button cell.

Background technology

Chargeable lithium ion battery and lithium soft-package battery are widely used in that electronic equipment, such as mobile phone and earphone can be held In.In especially small equipment such as audiphone, energy density per unit volume metric density is a critical consideration.Wang Fang etc. is published in 2011 U.S. patent (the US8,993,148 of entitled " a kind of button cell collocation method of new screw winding electrode " in April No. 21 in year B2 in), a kind of extremely dominant method of energy density per unit volume metric density in the button cell of lithium Soft Roll or multilayer electrode is elaborated. Comparing in detail on previous different process also all discusses in that part of patent.

In W. Gao Gele are published in the B of Chinese patent CN 102804473 in November, 2012 No. 28, screw winding electricity Pole is also employed but width is not gradually decreased.Instead it is outer in this patent and the compression of unused mechanicalness encapsulates battery Shell horizontal soil pressure is in cushion rubber and interior covers.This design has no longitudinal button side power in the battery, and the sealing of battery has lacked together Ensure.Electrode is welded on conductor first, and then conductor is hermetically laser welded on shell behind battery snap side in outside batteries. This method welds ecto-entad, and the heat of conduction will pass through housing, and control is very accurate, and rosin joint otherwise easily occurs causes weldering Connect bad, or weld and burn-through housing leakage excessively；Other center also needs to a larger winding core and carrys out supporting welding, the winding Core takes inner space causes battery capacity relatively low.

In Chinese patent application 200910213615.1 and 201410156913.2 and United States Patent (USP) (US8,993,148 B2 in), sheet metal is directly contacted with housing bottom inner plane, and contact is good between this requires two kinds of metals.Common metal piece Material be aluminium, and the material of housing is 304 or 316 stainless steels, because oxide layer on stainless steel surface is thicker, its contact resistance compared with Greatly, the internal resistance of cell for being done is big and uneven.If plating the metal such as nickel of last layer good conductivity in stainless steel surfaces, due to It is in inside battery, it is difficult to avoid the contact with electrolyte, nickel can lose electronics and progressively be dissolved in electricity in charge and discharge process In solution liquid, being finally deposited on electrode causes the cycle life of battery short.

Utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, there is provided a kind of simple structure, Electric conductivity is high and chargeable lithium ion button cell of long service life.

The technical scheme that the utility model is used is：The utility model is including seal casinghousing, located at the seal casinghousing Interior electrode, located at the seal casinghousing electrolyte inside and located at the seal casinghousing inner septum；In the seal casinghousing includes At least respectively there is inner cap top and outer casing bottom that a plane constitutes battery in lid and shell, the inner cap and the shell；Institute State and insulation cushion rubber is provided between inner cap and the shell, the insulation cushion rubber includes a pin side and a stile, the pin side Cover the edge of opening of the inner cap；The electrode includes first electrode and second electrode, and the first electrode is provided with the One conductive lug, the second electrode is provided with the second conductive lug, and the described first conductive lug is by sheet metal and shell electricity Property connection, between the sheet metal is outer with the pin side in the outer casing bottom, the second conduction lug is interior with described Tops are electrically connected with, and metal foil is provided between the sheet metal in the outer casing bottom.

Further, the first electrode, the second electrode and the barrier film form circular or ellipse by winding Helical coil and the helical coil are perpendicular to the shell and the plane of inner cap.

Further, the described second conductive lug is connected by welding with the inner cap top；Described first conductive lug leads to Welding is crossed to be connected with the sheet metal.

Further, a kind of chargeable lithium ion button cell also includes a felt pad, and the felt pad is in welding Before be affixed on the sheet metal, another circular felt pad is sticked after with first electrode welding, it is ensured that described the One conductive lug is exposed in electrolyte with the joint face of the sheet metal without metal.

Further, the uncoated area and disconnected area of the described first conductive lug and the second conductive lug are equipped with absolutely Edge adhesive tape is covered, and is ensured without metal in electrolyte with this.

Further, the metal foil be by aluminium, the metal material such as copper by the thin slice obtained by calendering or electrolytic method, Its thickness can be between 0.001-0.1 millimeters.

Further, the metal foil is closely linked together with the shell by welding or rolling methods.

The beneficial effects of the utility model are：Because the utility model is including seal casinghousing, in the seal casinghousing Electrode, located at the seal casinghousing electrolyte inside and located at the seal casinghousing inner septum；The seal casinghousing includes inner cap And shell, at least respectively there is inner cap top and outer casing bottom that a plane constitutes battery in the inner cap and the shell；It is described Insulation cushion rubber is provided between inner cap and the shell, the insulation cushion rubber includes a pin side and a stile, and the pin side is covered Cover the edge of opening of the inner cap；The electrode includes first electrode and second electrode, and the first electrode is provided with first Conductive lug, the second electrode is provided with the second conductive lug, and the described first conductive lug is electrical with shell by sheet metal Connection, between the sheet metal is outer with the pin side in the outer casing bottom, the second conduction lug and the inner cap Top is electrically connected with, and metal foil is provided between the sheet metal in the outer casing bottom, so the utility model structure is simple List and electric conductivity is strong；The packing ring and the insulating tape are prevented from the short circuit between electrode edge and cap, and can carry The cycle life of battery high.First be welded on the aluminium foil of one piece of circle on its bottom inner plane using preceding by metal shell, also may be used Directly with stainless steel and the composite steel band of aluminium, wherein aluminium internally.Its thickness can be between 0.001-0.1 millimeters, generally thick Degree is between 0.005-0.02 millimeters.Cathode tab is welded on circular aluminium flake, the aluminium flake is squeezed in shell bottom by cushion rubber On the aluminium foil in portion, so can be in close contact therewith.This mode is simply welded on aluminium flake using one piece of minimum lug.So The aluminum flake surface for being welded is attached to using insulation spacer afterwards, to prevent it to be exposed in electrolyte, battery short circuit is reduced with this and is prolonged Its service life cycle long.

Brief description of the drawings

Fig. 1 is internal structure schematic diagram of the present utility model.

Specific embodiment

As shown in figure 1, the utility model is including seal casinghousing, the electrode in the seal casinghousing, located at described close Electrolyte and located at the seal casinghousing inner septum 6 in capsule body；The seal casinghousing includes inner cap 1 and shell 3, the inner cap 1 and the shell 3 at least respectively there is plane and constitute the inner cap top 1a and outer casing bottom 3a of battery and perpendicular to the two The profile that the periphery in face is enclosed can be circular or ellipse；Insulation cushion rubber 2 is provided between the inner cap 1 and the shell 3, The insulation cushion rubber 2 includes that a pin side 2b and stile a 2a, the pin side 2b cover the edge of opening of the inner cap 1, Shell aperture edge 3c acts on the power on inner cap bending part 1b to realize the sealing to battery using mechanical clasps side by cushion rubber； The electrode includes first electrode and second electrode, and the first electrode is provided with the first conductive lug 7, in the second electrode The second conductive lug 13 is provided with, the described first conductive lug 7 is electrically connected with by sheet metal 10 with shell, and the sheet metal 10 sets Between outer with the pin side 2b in the outer casing bottom 3a, the described second conductive lug 13 electrically connects with the inner cap top 1a Connect；The first electrode, the second electrode and the barrier film 6 form the helical coil of circular or ellipse and described by winding Helical coil is perpendicular to the shell 3 and the plane of inner cap 1；In the outer casing bottom 3a gold is provided between the sheet metal 10 Category paper tinsel 15, the metal foil 15 is the thin slice by calendering or electrolysis etc. obtained by method by metal materials such as aluminium or copper, its Thickness can between 0.001-0.1 millimeters, the electric conductivity of battery can so significantly be lifted.

In the present embodiment, the described second conductive lug 13 is connected by welding with the inner cap top 1a；Described first Conductive lug 7 is connected by welding with the sheet metal 10.

In the present embodiment, a kind of chargeable lithium ion button cell also includes a felt pad 11a, the insulation Pad 11a is affixed on the sheet metal 10 before welding, and another circular felt pad 11 is after with first electrode welding Stick, it is ensured that the described first conductive lug 7 is exposed in electrolyte with the joint face of the sheet metal 10 without metal, can so be prevented Short circuit and battery only can be extended between electrode and lid shell.

In the present embodiment, the metal foil 15 is closely connected to the shell 3 by methods such as welding, roll-ins Together.

The utility model is applied to the technical field of rechargeable battery.

Although embodiment of the present utility model is described with practical solution, do not constitute and the utility model is contained The limitation of justice, for those skilled in the art, the group according to this specification to the modification of its embodiment and with other schemes Conjunction will be apparent from.

Claims

1. a kind of chargeable lithium ion button cell, including seal casinghousing, the electrode in the seal casinghousing, located at described Electrolyte in seal casinghousing and the barrier film in the seal casinghousing（6）；The seal casinghousing includes inner cap（1）And shell （3）, the inner cap（1）With the shell（3）At least respectively there is the inner cap top that a plane constitutes battery（1a）With shell bottom Portion（3a）；The inner cap（1）With the shell（3）Between be provided with insulation cushion rubber（2）, the insulation cushion rubber（2）Including a pin Side（2b）With a stile（2a）, the pin side（2b）Cover the inner cap（1）Edge of opening；The electrode includes first Electrode and second electrode, the first electrode are provided with the first conductive lug（7）, the second electrode is provided with the second conductive electrode Ear（13）, the described first conductive lug（7）By sheet metal（10）It is electrically connected with shell, the sheet metal（10）Located at described Outer casing bottom（3a）It is interior with the pin side（2b）Between outer, the described second conductive lug（13）With the inner cap top（1a）Electrically Connection, it is characterised in that：The outer casing bottom（3a）It is interior with the sheet metal（10）Between be provided with metal foil（15）.

2. a kind of chargeable lithium ion button cell according to claim 1, it is characterised in that：The first electrode, institute State second electrode and the barrier film（6）The helical coil and the helical coil of circular or ellipse are formed by winding perpendicular to described Shell（3）With inner cap（1）Plane.

3. a kind of chargeable lithium ion button cell according to claim 2, it is characterised in that：Described second conductive lug （13）By welding and the inner cap top（1a）Connection；Described first conductive lug（7）By welding and the sheet metal （10）Connection.

4. a kind of chargeable lithium ion button cell according to claim 3, it is characterised in that：A kind of chargeable lithium Ion button cell also includes a felt pad（11a）, the felt pad（11a）The sheet metal is affixed on before welding（10） On, another circular felt pad（11）Sticked after with first electrode welding, it is ensured that the described first conductive lug（7）With The sheet metal（10）Joint face without metal in the electrolyte.

5. a kind of chargeable lithium ion button cell according to claim 4, it is characterised in that：Described first conductive lug （7）With the described second conductive lug（13）Uncoated area and disconnected area be equipped with insulating tape and cover, nothing is ensured with this Metal is in electrolyte.

6. a kind of chargeable lithium ion button cell according to claim 1, it is characterised in that：The metal foil（15）It is By aluminium or copper metal material by the thin slice obtained by calendering or electrolytic method, its thickness can be 0.001-0.1 millimeters Between.

7. a kind of chargeable lithium ion button cell according to claim 1, it is characterised in that：The metal foil（15）It is By welding or rolling methods and the shell（3）Closely link together.