CN201294240Y

CN201294240Y - Lithium battery with safety device

Info

Publication number: CN201294240Y
Application number: CNU2008200642624U
Authority: CN
Inventors: 杨鲁义
Original assignee: CHENGDU JIANZHONG LITHIUM BATTERY Co Ltd
Current assignee: CHENGDU JIANZHONG LITHIUM BATTERY Co Ltd
Priority date: 2008-07-15
Filing date: 2008-07-15
Publication date: 2009-08-19
Anticipated expiration: 2018-07-15

Abstract

The utility model discloses a lithium battery with a safety device, which comprises a casing, an upper cover and an anode pole, wherein the upper portion of the upper cover is provided with a safety device which comprises a thermosensitive resistor PTC element, a plastic cover and an anode cover, wherein an extracting end of the PTC element is welded with the anode of a battery, and the other extracting end is welded with an anode cover 6, and a plastic insulating strip is arranged on the upper cover. Compared with a battery which is not provided with a safety device, the lithium battery has an unchanged appearance size, and can protect batteries after an outer circuit is in short circuit accidentally. When the lithium battery is assembled to be a battery group to use, only one battery is needed to be equipped with a safety device. The lithium battery has low production cost and high reliability. The safety device is modularized, improves assembling efficiency, simplifies technique, and has simple operation. The lithium battery is suitable for column lithium batteries of WR34615, ER34615M types and the like.

Description

The lithium battery that has safeties

Affiliated technical field

The utility model relates to a kind of lithium battery, and especially pillar lithium-manganese cell and battery pack belong to technical field of chemical power.

Background technology

At present, lithium battery in use as the external circuit short circuit that meets accident, will cause battery drain even blast, and the battery pack that particularly is assembled into will cause casualties and device damage as being short-circuited.In order to prevent the generation of this class accident, generally be Fuse Type or composite are set on the outer wall of column type lithium cell, be temperature-sensitive resistance (PTC) safeties, when the former meets accident short circuit when external circuit, safeties fusing, cut off external circuit to guarantee cell safety, but need more renew safeties, battery just may work on; And the composite safeties are quite different, and after the external circuit short circuit, safeties work; the protection cell safety, and after the short trouble elimination, it is normal that safeties recover automatically; battery can work on and need not any processing, but both all need take bigger space outerpace in addition.

The utility model content

For the lithium battery that overcomes existing band safeties can not recover the deficiency using and take up room, the utility model provides a kind of composite and the lithium battery that has safeties of the occupying volume external space not.

The technical scheme that its technical problem that solves the utility model adopts is: the lithium battery that has safeties, comprise shell (battery cathode) 1, loam cake 2, positive terminal 3, loam cake 2 tops are provided with by PTC element 4, vinyl cover 5, positive cover 6 forms safeties, exit 4-1 of PTC element 4 and positive terminal 3 welding, another exit 4-2 welds with positive cover 6; Be provided with insulating trip 10 above the loam cake 1.

At the space mounting PTC element 4 of original column type lithium cell top perfusion resin, PTC element 4 is connected in series with battery, and when normally using, PTC element 4 presents Low ESR, and circuit is not had influence; When external circuit was short-circuited, overcurrent made PTC element 4 present high impedance, made external current be limited in a smaller value, and after short circuit was removed, PTC element 4 recovered Low ESR, and battery can normally use.

The beneficial effects of the utility model are, compare with the battery that does not add safeties, and its profile size is constant, after external circuit meets accident short circuit, can protect battery, and fault is eliminated the back battery and can be recovered to use.Being assembled into when battery pack is used only needs a battery installation insurance device wherein to get final product, so cost is low, and the reliability height.Since realized Arming Device Assembliesization having improved efficiency of assembling, work simplification, simple to operate.

Description of drawings

Fig. 1 is the utility model safeties Facad structure schematic diagram;

Fig. 2 is the A-A profile of Fig. 1;

Fig. 3 is the utility model general structure schematic diagram.

Parts and numbering among the figure:

1---shell; 2---loam cake; 3---positive terminal;

4---PTC element, 4-1---exit, 4-2---exit;

5---vinyl cover, 5-1---bar hole, 5-2---bulge loop;

6---positive cover, 6-1 a---sheet;

7---the long weld tabs of PTC; 8---the short weld tabs of PTC;

9---the plastic insulation ring; 10---insulating trip.

Embodiment

Below in conjunction with accompanying drawing and exemplifying embodiment the utility model is further specified.

The lithium battery that has safeties, comprise shell 1, loam cake 2, positive terminal 3, loam cake 2 tops are provided with by PTC element 4, vinyl cover 5, positive cover 6 forms safeties, exit 4-1 of PTC element 4 and positive terminal 3 welding, and another exit 4-2 welds with positive cover 6; Be provided with plastic insulation sheet 10 above the loam cake 2.

PTC element 4 is the sheet semi-round ring shape, and two outer surfaces are exit 4-1,4-2, and intermediate course is a ptc material.Be provided with plastic insulation ring 9 below the PTC element 4.

As Fig. 1,2, close circumference place at round plastic lid 5 is provided with four bar hole 5-1, four sheet 6-1 of positive cover 6 pass from bar hole 5-1 and are folding, short weld tabs 8 welding of exit 4-2 of sheet semi-round ring shape PTC element 4 and PTC, long weld tabs 7 welding of another exit 4-1 and PTC, semi-round ring shape PTC element 4 places and round plastic lid concentric position, the other end of the short weld tabs 8 of PTC and one of them sheet 6-1 welding, this sheet is folding outside circumference with another relative sheet, it is folding in circumference that other two sheets pass plastic insulation ring 9, the other end of the long weld tabs 7 of PTC passes from the hole of plastic insulation ring 9, promptly constitutes safeties.

Insulating trip 10 is the plastic insulation sheet.

As Fig. 3, one plastic insulation sheet 10 is installed on cell cover 2, the other end and 3 welding of anode post with the long weld tabs 8 of PTC, and place on the plastic insulation sheet 10, the bulge loop 5-2 of vinyl cover 5 is embedded in the battery case 1, then safeties are installed in the space of cell cover 2, install external packing additional, then finish the battery assembling.These safeties are applicable to the assembling of model column type lithium cells such as WR34615, ER34615M.

When the assembled battery group, only need to install safeties additional on the monocell therein, can play safety effect.

In conjunction with the accompanying drawings embodiment of the present utility model has been carried out exemplary description above, obviously the utility model is not limited thereto, and the various remodeling that carry out in the utility model scope all do not exceed protection range of the present utility model.

Claims

1, a kind of lithium battery that has safeties, comprise shell (1), loam cake (2), positive terminal (3), it is characterized in that, loam cake (2) top is provided with by PTC element (4), vinyl cover (5), positive cover (6) forms safeties, an exit (4-1) of PTC element (4) and positive terminal (3) welding, another exit (4-2) and positive cover (6) welding; Be provided with insulating trip (10) above the loam cake (2).

2, the lithium battery that has safeties according to claim 1 is characterized in that, described PTC element (4) is the sheet semi-round ring shape, and two outer surfaces are exit (4-1,4-2), and intermediate course is a ptc material.

3, the lithium battery that has safeties according to claim 1 is characterized in that, by the long weld tabs of PTC (7) welding, the long weld tabs of PTC (7) welds with positive terminal (3) again between an exit (4-1) of described PTC element (4) and the positive terminal (3); Weld by the short weld tabs of PTC (8) between another exit (4-2) and the positive cover (6).

4, the lithium battery that has safeties according to claim 1 is characterized in that, is provided with plastic insulation ring (9) below the described PTC element (4).

5, the lithium battery that has safeties according to claim 1 is characterized in that, described insulating trip (10) is the plastic insulation sheet.