CN2739806Y

CN2739806Y - Cylindrical secondary battery

Info

Publication number: CN2739806Y
Application number: CNU200420081210XU
Authority: CN
Inventors: 汪鲁建; 吴强; 陈国藩
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2004-07-23
Filing date: 2004-07-23
Publication date: 2005-11-09
Anticipated expiration: 2014-07-23

Abstract

The utility model relates to a cylindrical secondary battery, which comprises a positive pole piece (07), a diaphragm (08), a negative pole piece (06), a surface pad (04), and a battery housing (05), wherein the surface pad (04) comprises a bottom surface (41); the bottom surface (41) is provided with an annular lug boss (42); a liquid filling hole (46) and a pole ear hole (47) are arranged in the bottom surface (41); the pole ear hole (47) is a quadrate through hole or a through hole presenting a quadrate shape approximately; the liquid filling hole (46) and the pole ear hole (47) are not communicated. The cylindrical secondary battery of the utility model has the advantages of lower rate of short circuit and higher rate of finished products.

Description

Column secondary battery

[technical field]

The utility model relates to a kind of column secondary battery, and in more detail, it relates to the face pad in the column secondary battery.

[background technology]

Along with being extensive use of of various portable electronics products, people are more and more higher to the performance requirement as the secondary cell of above-mentioned device stand-by power supply.Short circuit ratio is an importance of reflection battery performance, draw the column secondary battery of lug for adopting in the pole piece, thereby to draw between lug and the battery case, draw between lug and the Battery Pole Core, cause battery short circuit than being easier to contact between Battery Pole Core and the battery case.

In order to address the above problem, adopt the method that the insulation accessory is set at inside battery usually, the more employing face pad of this insulation accessory: in battery case, draw the probability that top that lug is placed on pole piece reduces internal short-circuit of battery thereby the face pad passes.In actual production, the rate of finished products influence that the difference of face mat structure is made battery is very big.

At present, more common face mat structure as depicted in figs. 1 and 2, comprise the annular boss 42 that bottom surface 41 and bottom surface 41 are provided with, be provided with centre bore 43, lug hole 44 and imbibing hole 45 in the bottom surface 41, centre bore 43, lug hole 44 and imbibing hole 45 all are positioned at the annular region that described annular boss 42 forms;

Centre bore 43 is the semi arch in the bottom surface 41;

The zone that lug hole 44 is made up of arc surface that overlaps with annular boss 42 inner wall section and the corresponding string of this arc surface forms;

Centre bore 43 is connected with lug hole 44 by the neck 48 of hollow, and neck 48 two sides of hollow are parallel to the centre symmetry line of centre bore 43 and the two-end-point that an end is cut in centre bore 43 outward, and the other end is connected with the string limit in lug hole 44;

Imbibing hole 45 is inscribed within the inwall of annular boss 42, and one of them imbibing hole is positioned on the centre symmetry line of centre bore 43.

In the face pad of said structure, bottom surface 41 and annular boss 42 can reduce to draw the short circuit probability between (particularly jet-bedding position), Battery Pole Core and the battery case between lug and the battery case, it is inaccurate that but the face pad is drawn the location of lug, thus when draw lug occur distorting or draw lug long during in bending easily the position in the neck 48 of hollow, imbibing hole 45, lug hole 44 take place with pole piece in another extremely contacted situation cause internal short-circuit of battery.

[summary of the invention]

The purpose of this invention is to provide a kind of column secondary battery with low short circuit ratio.

The objective of the invention is to realize by following technical proposal:

A kind of column secondary battery, it comprises scroll pole piece, face pad, battery case and the hat terminal of being reeled and being formed by positive plate, barrier film, negative plate lamination successively; On battery case, be provided with the jet-bedding position; Described positive plate or negative plate are provided with at least one and draw lug, draw lug and pass the face pad and be connected with the hat terminal and make described pad of pole piece be placed on the pole piece upper end;

Described pad comprises the annular boss that a bottom surface, described bottom surface are provided with; Jet-bedding position inwall on described annular boss and the battery case is adjacent; Be provided with liquid injection hole, lug hole in the described bottom surface, described liquid injection hole, lug hole all are positioned at the annular region that described annular boss forms;

Wherein, described lug hole is the through hole of square or squarish, and described liquid injection hole is not communicated with the lug hole.

Technique scheme further is improved to:

Also be provided with imbibing hole in the described bottom surface, imbibing hole is positioned at the annular region that described annular boss forms.

Described liquid injection hole is positioned at the centre of bottom surface.

Described imbibing hole be not the center of circle with the imbibing hole center, is being center line with the centre symmetry line of lug hole by bottom center, clockwise 30 ° with counterclockwise 30 ° of sector regions that covered in.

The length in described lug hole and the difference of lug width are not less than 0.5mm, are not more than 3.0mm.

The diameter of described liquid injection hole is not less than 0.5mm, is not more than 3.0mm.

The diameter of described imbibing hole is not less than 0.5mm, is not more than the width of drawing lug.

The advantage of the utility model column secondary battery is: the short circuit ratio of battery is lower, and the rate of finished products of battery is higher.

[description of drawings]

Fig. 1 levels up the face structural representation for the prior art face

Fig. 2 is a prior art face pad profile

Fig. 3 is a face mat structure schematic diagram in the utility model

Fig. 4 is a face pad profile in the utility model

The part sectioned view of column secondary battery shown in Fig. 5 the utility model embodiment

Fig. 6 is another structural representation of face pad in the utility model

Fig. 7 is a face pad profile among Fig. 6

Fig. 8 is another structural representation of face pad in the utility model

Symbol description:

01-hat terminal 02-draws lug

04-face pad 05-battery case

06-negative plate 07-positive plate

08-barrier film 10-jet-bedding position

41-bottom surface 42-annular boss

43-centre bore 44,47-lug hole

45-imbibing hole 46-liquid injection hole

The 48-neck

[embodiment]

Below in conjunction with embodiment and accompanying drawing the utility model is further described.With cylindrical NI-G secondary cell is that example describes the utility model.

[embodiment]

Shown in Fig. 5-7, be the part sectioned view of cylindrical NI-G secondary cell shown in the utility model embodiment.Positive plate 07, negative plate 06 all adopts prior art to make, with positive plate 07, barrier film 08, negative plate 06 is the scroll pole piece of lamination coiling formation successively, face pad 04 is positioned over the pole piece upper end makes the bottom surface 41 in the face pad 04 contact with the pole piece upper end, and be accommodated in the battery case 05, at battery case 05 surperficial jet-bedding, annular boss 42 in the face pad 04 is adjacent with jet-bedding position 10 inwalls on the battery case 05, bottom surface 41 in the face pad 04 be fastened on jet-bedding position 10 below, can reduce Battery Pole Core like this with battery case 05 and draw the probability that lug 02 contacts with battery case 05, can prevent simultaneously that the string of pole piece in battery case 05 is moving, reduce the chance that internal short-circuit appears in battery; Positive plate or negative plate are provided with at least one draws lug 02 and passes face pad 04 and be connected with hat terminal 01 and make pole piece and hat terminal 01 form conductive channel; Inject alkaline electrolyte, then by the openend sealing of hat terminal 01 with battery case 05.So just obtain cylindrical NI-G secondary cell one Battery pack of the utility model structure, be designated as the A group.

Wherein, the structure that face pad 04 adopts as shown in Figure 6, profile is as shown in Figure 7.Described pad 04 comprises the annular boss 42 that a bottom surface 41 and bottom surface 41 are provided with, what bottom surface 41 and annular boss 42 can be for one, also can be for split; Be provided with liquid injection hole 46, lug hole 47 and imbibing hole 45 in the bottom surface 41, liquid injection hole 46, lug hole 47 and imbibing hole 45 all are positioned at the annular region that described annular boss 42 forms; Liquid injection hole 46 is positioned at the centre of bottom surface 41, and the alkaline electrolyte of injection is easy to each the position diffusion to Battery Pole Core; Lug hole 47 is the through hole of square or squarish, so not only can be conveniently to drawing the location of lug, and can reduce the long probability that lug contacts with the jet-bedding position of drawing; Liquid injection hole 46 is not communicated with lug hole 47, can prevent to draw lug and contact with pole piece when bending, thereby can reduce the internal short-circuit of battery probability; With imbibing hole 45 centers is the center of circle, with the centre symmetry line of lug hole 47 by 41 centers, bottom surface is center line, clockwise 30 ° with counterclockwise 30 ° of sector regions that covered in no imbibing hole, for having long battery of drawing lug, can prevent to draw lug and when bending or twisting, cause the short circuit of drawing between lug and Battery Pole Core; Imbibing hole 45 can have a plurality of.

Face pad 04 also can adopt structure as shown in Figure 3, and profile is as shown in Figure 4, and is simple in structure, and it is convenient to draw lug location, and the battery assembling is more convenient, and draw that lug is not easy and Battery Pole Core between short circuit.

Face pad 04 can also adopt structure as shown in Figure 8, and lug hole 47 is square, can make extraction pole ear location more accurate, draw that lug is not easy when bending or twisting and Battery Pole Core between be short-circuited.

The difference of the length in lug hole 47 and lug width preferably is not less than 0.5mm, is not more than 3.0mm, and is too little, and in the process of battery assembling, operation is difficulty relatively; Too big, then the lug hole is too big to the space, location of drawing lug and reserving, and increases with the pole piece contact probability after drawing the lug bending or twisting.

The diameter of liquid injection hole 46 preferably is not less than 0.5mm, is not more than 3.0mm, and the diameter of imbibing hole 45 preferably is not less than 0.5mm, is not more than the lug width, and is too little, and electrolyte infiltration in the pole piece is slower, and battery manufacturing process is longer; Too big, cause the internal short-circuit of battery probability to increase thereby draw back contact of lug bending distortion with pole piece.

[comparative example]

The preparation of comparative example battery: except adopting face pad as shown in Figure 1, all the other same embodiment obtain the corresponding one group cylindrical NI-G secondary cell identical with embodiment quantity, are designated as the B group.

[performance test]

Battery short circuit rate test: the short circuit ratio situation that adopts universal instrument test implementation example and comparative example, through statistics, the short circuit ratio that draws the A Battery pack is 2968ppm, is 5036ppm than the short circuit ratio of B Battery pack, the short circuit ratio of A Battery pack reduces 2069ppm than B Battery pack, and reduced rate is 41%.

In sum, the utility model column secondary battery short circuit ratio is lower, and the rate of finished products of battery is higher.

Claims

1, a kind of column secondary battery, it comprises scroll pole piece, face pad (04), battery case (05) and the hat terminal (01) of being reeled and being formed by positive plate (07), barrier film (08), negative plate (06) lamination successively; Wherein, on described battery case (05), be provided with jet-bedding position (10);

Wherein, described positive plate or negative plate are provided with at least one and draw lug (02), draw lug (02) and pass face pad (04) and be connected with hat terminal (01), and described pad (04) is placed on the pole piece upper end;

Described pad (04) comprises the annular boss (42) that a bottom surface (41), described bottom surface (41) are provided with; Described annular boss (42) is adjacent with jet-bedding position (10) inwall on the battery case (05); Be provided with liquid injection hole (46), lug hole (47) in the described bottom surface (41), described liquid injection hole (46), lug hole (47) all are positioned at the annular region that described annular boss (42) forms;

It is characterized in that: described lug hole (47) is the through hole of square or squarish, and described liquid injection hole (46) is not communicated with lug hole (47).

2, column secondary battery as claimed in claim 1 is characterized in that: also be provided with imbibing hole (45) in described bottom surface (41), imbibing hole (45) is positioned at the annular region that described annular boss (42) forms.

3, column secondary battery as claimed in claim 2 is characterized in that: described liquid injection hole (46) is positioned at the centre of bottom surface (41).

4, as claim 2 or 3 described column secondary batteries, it is characterized in that: described imbibing hole (45) be not the center of circle with imbibing hole (45) center, is being center line with lug hole (47) centre symmetry line by center, bottom surface (41), clockwise 30 ° with counterclockwise 30 ° of sector regions that covered in.

5, column secondary battery as claimed in claim 1 is characterized in that: the length in described lug hole (47) is not less than 0.5mm with the difference of drawing the lug width, is not more than 3.0mm.

6, column secondary battery as claimed in claim 1 is characterized in that: the diameter of described liquid injection hole (46) is not less than 0.5mm, is not more than 3.0mm.

7, as claim 2 or 3 described column secondary batteries, it is characterized in that: the diameter of described imbibing hole (45) is not less than 0.5mm, is not more than the width of drawing lug.