CN202917546U

CN202917546U - Protective cover plate of lithium battery and lithium battery with same

Info

Publication number: CN202917546U
Application number: CN2012202924072U
Authority: CN
Inventors: 孙嘉遥; 吴合年; 杨瑞远
Original assignee: HUBEI SANJUN BATTERY CO Ltd
Current assignee: In Science And Technology (shenzhen) Co Ltd Xiede
Priority date: 2012-06-21
Filing date: 2012-06-21
Publication date: 2013-05-01
Anticipated expiration: 2022-06-21

Abstract

The utility model relates to the field of battery products and in particular to a protective cover plate of a lithium battery and a lithium battery with the same. The protective cover plate comprises a plate body, a box-shaped insulating piece fixed at the lower end of the plate body, and a connecting sheet fixed below the insulating piece and electrically connected with the plate body, wherein a bottom box and a spacer ring are arranged on the insulating piece, an opening is formed at the top of the bottom box, the plate body is fixedly connected with the bottom of the bottom box, the connecting sheet is positioned inside the bottom of the bottom box, the spacer ring is fixed at the top of the bottom box, a hole is formed on the spacer ring in the position facing the opening of the bottom box, a clamp hole is formed on the side wall of the bottom box, and a clamp is arranged on the side face of the spacer ring and engaged with the clamp hole. The insulating piece and the spacer ring, which have the insulation functions, can prevent the contact between the cathode lug and the anode lug, the anode piece, the plate body and the housing, so as to eliminate the danger of short circuit caused by long cathode lugs or poor spot-welding.

Description

A kind of cover sheet of lithium battery and lithium battery thereof

Technical field

The utility model relates to the battery product field, is specifically related to a kind of cover sheet and lithium battery thereof of lithium battery

Background technology

Along with developing rapidly of high and new technology; nowadays the various portable digital products such as digital camera, Digital Video, MP3, MP4 have been used widely; and as the power supply of above-mentioned digital product, lithium battery because have high-energy-density, lightweight, high internal resistance, high cell voltage, cycle-index is many, self-discharge rate is low, be difficult for reaching and charge fully and the characteristic such as the circuit that needs protection.And compare with Ni-MH battery with NI-G, the energy density that lithium battery is higher, more cycle-index are the main causes of showing one's talent with lower self-discharge rate, therefore are widely used in the portable wireless electronics by it.

But existing lithium battery still exists many potential safety hazards; When the lithium battery short circuit, because battery current rises rapidly, it will cause the variation of positive active material structure and the oxidation Decomposition of electrolyte, and then produce a large amount of gas and emit a large amount of heat, cause inner pressure of battery and temperature sharply to rise, have the potential safety hazards such as blast, burning.Please refer to Fig. 1, lithium battery in the prior art is provided with shell 7 ', in this shell 7 ' battery 5 ' is installed, be fixed with cover plate at this shell 7 ', wherein this cover plate is provided with plate body 1 ', is fixed with insulating part 2 ' below this plate body 1 ', and the below of this insulating part 2 ' is fixed with the brace 4 ' that is electrically connected with this plate body 1 ', simultaneously be covered with spacer ring 3 ' in this battery 5 ', the lug 6 ' of this battery 5 ' passes spacer ring 3 ' and is electrically connected with brace 4 ' on the cover plate.But, in this structure, because between spacer ring 3 ' and the lug 6 ', between spacer ring 3 ' and the shell 7 ', and all there is the space between spacer ring 3 ' and the insulating part 2 ', lug 6 ' can exist runs into shell 7 ', or the danger that contacts positive pole ear, positive plate and plate body 1 ' is arranged, cause the potential safety hazard of battery short circuit

Summary of the invention

For overcoming defects, the purpose of this utility model namely is to provide a kind of cover sheet and lithium battery thereof of lithium battery.

The purpose of this utility model is achieved through the following technical solutions:

The cover sheet of a kind of lithium battery of the utility model, mainly comprise: plate body, the lower end of described plate body is fixed with a box-like insulating part, the below of described insulating part is fixed with the brace that is electrically connected with this plate body, described insulating part is provided with end box and spacer ring, the end face of this end box is formed with opening, described plate body is fixedly connected with the bottom of this end box, described brace is positioned at the bottom of this end box, this spacer ring is fixed on the end face of this end box, and the opening part of relatively described end box is formed with perforate on this spacer ring; The sidewall of box of the described end is provided with hole clipping, and the side of described spacer ring is provided with the snap fit that matches with described hole clipping.

Further, the bottom of box of the described end is to be fixed on the described plate body by rivet, and this rivet is fixed on brace the bottom in this end box simultaneously, and this brace forms with plate body by this rivet and is electrically connected.

A kind of lithium battery of the utility model mainly comprises: shell, in this shell battery is installed, and be fixed with aforesaid cover sheet at this shell, the perforate that the lug of described battery passes this cover sheet is electrically connected with brace.

The utility model utilizes the insulation function of insulating part and spacer ring, and isolated negative lug contacts with positive pole ear, positive plate, plate body and shell, avoids or the spot welding bad danger that causes short circuit partially long because of negative lug.Namely in the quality that guarantees lithium battery, improve the fail safe of battery, rationally utilized the box body of the insulation and obturation shape that insulating part and spacer ring form, with brace and negative lug fully and plate body and shell isolated, even run into that negative lug is partially long, spot welding is bad or the folding lug after the situations such as shape is improper, lug also only can be run on the box wall of insulating part, or run into spacer ring, do not have the danger of contact positive pole ear, positive plate, plate body and shell, and insulating part and spacer ring all insulate, and have therefore reduced the potential safety hazard of battery short circuit.

Description of drawings

In order to be easy to explanation, the utility model is done to describe in detail by following preferred embodiment and accompanying drawing.

Fig. 1 is the cross-sectional view of lithium battery in the prior art;

Fig. 2 is the stereochemical structure decomposing schematic representation of the cover sheet of lithium battery of the present utility model;

Fig. 3 is the cross-sectional view of the cover sheet of lithium battery of the present utility model;

Fig. 4 is the cross-sectional view of lithium battery of the present utility model.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

See also Fig. 2 and Fig. 3, the cover sheet of a kind of lithium battery of the utility model, mainly comprise: plate body 1, the lower end of described plate body 1 is fixed with a box-like insulating part 2, the below of described insulating part 2 is fixed with the brace 4 that is electrically connected with this plate body 1, described insulating part 2 is provided with end box 21 and spacer ring 23, the end face of this end box 21 is formed with opening, described plate body 1 is fixedly connected with the bottom of this end box 21, described brace 4 is positioned at the bottom of this end box 21, this spacer ring 23 is fixed on the end face of this end box 21, and the opening part of relatively described end box 21 is formed with perforate 29 on this spacer ring 23; The sidewall of box of the described end 21 is provided with hole clipping 25, and the side of described spacer ring is provided with the snap fit 27 that matches with described hole clipping 25.

Further, the bottom of box of the described end 21 is to be fixed on the described plate body 1 by rivet 28, and this rivet 28 is fixed on brace 4 bottom in this end box 21 simultaneously, and this brace 4 forms with plate body 1 by this rivet 28 and is electrically connected.

Please refer to Fig. 4, lithium battery of the present utility model, be provided with shell 7, in this shell 7 battery 5 is installed, be fixed with the cover plate of said structure at this shell 7, wherein the lug 6 of this battery 5 is the perforates 29 on the spacer ring 23 that passes on the cover plate and then forms and be electrically connected with brace 4 in the end box 21.Obviously, lug 6 all is folded in the box-like insulating space of end box 21 and spacer ring 23 formed sealing attitudes, if lug 6 is partially long or spot welding is bad, lug also only can bump on end box 21 or spacer ring 23, and can not contact with positive plate, positive pole ear or plate body 1, shell 7 etc. and cause short circuit.And the snap fit on the spacer ring 23 27 can well be buckled on the end box 21, and is bad with regard to not cooperating with insulating part 2 because of spacer ring 23 like this, and causes battery short circuit so that lug 6 stretches out joint.

The above only is preferred embodiment of the present utility model, not in order to limiting the utility model, all any modifications of doing within spirit of the present utility model and principle, is equal to and replaces and improvement etc., all should be included within the protection range of the present utility model

Claims

1. the cover sheet of a lithium battery, it is characterized in that, comprise: plate body, the lower end of described plate body is fixed with a box-like insulating part, the below of described insulating part is fixed with the brace that is electrically connected with this plate body, described insulating part is provided with end box and spacer ring, the end face of this end box is formed with opening, described plate body is fixedly connected with the bottom of this end box, described brace is positioned at the bottom of this end box, this spacer ring is fixed on the end face of this end box, and the opening part of relatively described end box is formed with perforate on this spacer ring; The sidewall of box of the described end is provided with hole clipping, and the side of described spacer ring is provided with the snap fit that matches with described hole clipping.

2. the cover sheet of a kind of lithium battery as claimed in claim 1; it is characterized in that: the bottom of box of the described end is to be fixed on the described plate body by rivet; this rivet is fixed on brace the bottom in this end box simultaneously, and this brace forms with plate body by this rivet and is electrically connected.

3. a lithium battery is characterized in that, comprising: shell, in this shell battery is installed, and be fixed with such as each described cover sheet of claim 1 to 2 at this shell, the perforate that the lug of described battery passes this cover sheet is electrically connected with brace.