CN2604780Y

CN2604780Y - Alkaline secondary cell

Info

Publication number: CN2604780Y
Application number: CNU032243634U
Authority: CN
Inventors: 李维; 汪鲁建; 毕国忠; 王合祥; 张金涛
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2003-03-13
Filing date: 2003-03-13
Publication date: 2004-02-25
Anticipated expiration: 2013-03-13

Abstract

The utility model relates to an alkali secondary cell, which comprises a swirl electrode assembly composed of a strip-shaped positive electrode plate, a strip-shaped negative electrode plate and a diaphragm, a current collector welded at the end surface of the electrode assembly, and a current collector structure which is arranged in a metal casing the same with the current collector and has an improved end surface weld. The current collector is provided with an extracting electrode ear, and the main body of the extracting electrode ear is provided with an opening and is provided with a flange rib structure. The extracting electrode ear can be firmly welded with each ring of terminals at the end surface of the whole swirl electrode assembly. The cell has superior high-current charging and discharging performance and higher discharge capacity.

Description

Alkaline secondary cell

[technical field]

The utility model relates to secondary cell, and in more detail, it is good that it relates to a kind of high rate during charging-discharging, the alkaline secondary cell of high discharge capacity.

[background technology]

Along with being extensive use of of various portable electronics products and electric tool, people are more and more higher to the performance requirement as the secondary cell of above-mentioned device stand-by power supply.Particularly, require it to have good high rate during charging-discharging and higher heavy-current discharge capacity for the instrument battery.

In order to improve the high-rate performance of instrument battery, weld this method and adopted more and more by electrode being carried out end face.When electrode being carried out the end face welding, the shape of current-collector and structure have considerable influence to the discharge performance of battery.Generally be perforation or opening on current-collector at present, make to form uniform burr, join and touch welding thereby help current-collector and pole piece.In Chinese patent 98105286.X, a kind of current collector structure has been proposed, this current-collector is a plurality of opening features to be housed and from extending to its neighboring near the center with radial manner, the projecting part that edge of opening forms is with the interlock of electrode terminal edge and weld.This kind structure has improved the speed that discharges and recharges of battery effectively, but because it will guarantee the intensity of current-collector itself, opening can not be too near near the center, and this just makes the inner ring of its scroll electrode terminal can not get welding, and influences the current collection effect of end face.What is more important for making the electrode conducting that is connected with the shape for hat terminal of cell sealing cover top portion, must have a connection piece, has so just increased the inside contact resistance of battery, influences its high-rate performance.

Therefore, further improve the high-rate performance of instrument battery, just must improve its current-collector and connector.Farthest reduce the internal resistance of cell, make its end face effect of confluxing reach best, thereby provide high-rate performance good secondary cell.

[utility model content]

The purpose of the utility model is to provide a kind of secondary cell, and this internal resistance of rechargeable battery is low, and CURRENT DISTRIBUTION is even, has good high rate during charging-discharging and higher discharge capacity.

The purpose of this utility model realizes by following technical proposal:

A kind of alkaline secondary cell, it comprises one by positive electrode plate, the scroll electrode assemblie that negative electrode plate and barrier film are formed, a current-collector that is welded in the electrode assemblie end face, be placed in jointly in the metal shell, by the shape for hat terminal sealing, the overall structure that wherein said current-collector partly is made up of main part and lug, its main part is the metallic plate of center drilling, with the Kong Xinwei reference point, at the plate face opening is set and extends to the plate neighboring, projecting rib and the interlock intersected with each other of scroll electrode assemblie end face that the downward flange in the marginal portion of opening forms, and be welded to one another in a plurality of positions; This current-collector lug is partly drawn from main part, and top and shape for hat terminal are welded to one another and conducting.

As further improvement of the utility model, the part opening of current collector body part is near the hole heart, its projecting rib can with the inside circumference interlock welding each other of scroll electrode assemblie, this will greatly improve the effect of confluxing of end face.

Further improve as the utility model, the number of the part opening of the close hole heart should be 25%～50% of opening sum again.Such ratio not only makes the effect of confluxing better, and can not make the intensity of current collector body part be subjected to too much influence.

When the utility model was further improved again, when adopting the number of opening to be 2～7, the projecting rib components number was 4～14, and it is more that the end face welding of battery is counted, and welding effect is better.

The utility model alkaline secondary cell accessory is simple, the overall structure current-collector of brace is saved in use, the internal resistance of cell is low, the welding that has the end face of the opening of rib structure and electrode assemblie has greatly improved the uniformity that electrode current distributes in the battery, has improved battery high rate during charging-discharging and discharge capacity.

The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.

[description of drawings]

Fig. 1 is the schematic partial sectional view of NI-G secondary cell shown in the utility model embodiment.

Fig. 2 a is the vertical view that the utility model embodiment battery uses the current-collector flat.

Fig. 2 b is that current-collector shown in Fig. 2 a is along the amplification view of A-A line.

Fig. 3 is the vertical view of the current-collector flat shown in the utility model comparative example.

Fig. 4 is the utility model embodiment and comparative example battery welding effect contrast schematic top plan view.

[embodiment]

Please refer to Fig. 1, be the schematic partial sectional view of NI-G secondary cell shown in the utility model embodiment.Battery A has the Sc type NI-G secondary cell that nominal capacity is 1700mAh, and its concrete structure and manufacturing process are as follows:

Make the cadmium cathode plate 2 that nickel positive electrode plate 1 that a size is about 205mm * 33mm * 0.53mm and size are about 250mm * 33.6mm * 0.50mm.The terminal edge of positive plate on its length direction is equipped with exposed nickel chip part 3, between battery lead plate, insert a barrier film, positive/negative plate is staggered on its Width, and make exposed nickel chip part outside, twine whole assembly spirally to form the scroll electrode assemblie, the entire electrode assembly is placed in the battery case 4, positive plate nickel chip part 3 is positioned at the upper end, having the current-collector 5 of drawing lug with one simultaneously settles on it, the terminal edge that its main part and scroll electrode assemblie end face protrude upward is welded, with its lug part external part and 6 welding of pole plate terminal.In battery, the alkaline electrolyte of predetermined quantity is injected battery case, the plate of fitting tight simultaneously 7, and to battery seal.Obtain battery A of the present utility model like this.

Shown in Fig. 2 a, be soldered to the overall structure that the current-collector of electrode plate assembly upper end is made up of lug part 8 and main part 9, integrally-built current-collector will reduce the contact internal resistance of inside battery greatly, for the big electric current of raising battery facilitates.Current collector body part 9 is the plate of center drilling, with the Kong Xinwei reference point, at the plate face 4

oblong openings

11a, 11b, 11c, 11d are set, extend to the plate neighboring, the opposite edges of each opening part all downwards flange form the projecting rib 12 of proper alignment, (please refer to Fig. 2 b) its thickness is identical with plate part, when welding, intersected with each other and the interlock of nickel chip part that each projecting rib and scroll positive electrode plate edge are exposed is welded them securely by welding electrode.In 4 openings, opening 11a is near the hole heart, its projecting rib can with the inner terminal edge interlock welding each other of scroll electrode assemblie, will make the entire electrode CURRENT DISTRIBUTION even like this, it is optimum that the effect of confluxing of electrode end surface reaches.

For comparing the battery of said structure, make 50 battery A, be called battery A group.

Comparative example

Make battery B: use the current-collector of drawing lug that has as shown in Figure 3, this current collector structure is close with the current-collector that example battery A uses, just 4 opening 15a, 15b, 15c, the 15d of its main part all keep clear of the hole heart, that is: its projecting rib all not with the inner terminal intersect edge interlock of scroll electrode assemblie.The same embodiment of battery manufacturing process.Make 50 battery B, be called battery B group.

A, B Battery pack are carried out the discharge performance test: the battery of battery A group and battery B group was charged 75 minutes with 1700mA, control-Δ V=15mV, shelved 30 minutes, being discharged to voltage with 1700mA then is 1.0V, discharge capacity is designated as the 1C discharge capacity, with discharge time (minute) represent its discharge capacity.Test result sees Table 1:

Table 1

Battery	Battery A group	Battery B group
Battery	Battery A group	Battery B group	Average discharge capacity (min)	63.5	62

As shown in table 1, the discharge capacity of the cell ratio with battery A structure has battery B discharge capacity of the cell mean height 1.5min structurally.

In order to check the difference of battery pad, dismounting A Battery pack and B Battery pack, find between current-collector and the electrode welding effect as shown in Figure 4, wherein the pad design sketch of left side signal is a battery B group, the welding effect figure of right side signal is battery A group, stain signal pad.As seen, adopt the utility model, current-collector is welded mutually with the entire electrode that comprises electrode slice coiling beginning one end, effectively improve the uniformity of CURRENT DISTRIBUTION in the electrode, improved the discharge capacity of battery.

The utility model example describes with nickel-cadmium Sc battery, but for other alkaline secondary cell, as: ni-MH battery, nickel-zinc cell are suitable for too.

The current collector body of drawing lug that has of the utility model example battery partly describes with 4 openings, and for the different battery of cross-sectional sizes, its opening number can be preferred among 2～7 in the reality.And the shape of main part can be circular or square or sub-circular square structure according to the battery production concrete condition.

Claims

1, a kind of alkaline secondary cell, it comprises one by positive electrode plate, the scroll electrode assemblie that negative electrode plate and barrier film are formed, a current-collector that is welded in the electrode assemblie end face, be placed in jointly in the metal shell, by the shape for hat terminal sealing, it is characterized in that: the overall structure that this current-collector partly is made up of main part and lug, its main part is the metallic plate of center drilling, with the Kong Xinwei reference point, at the plate face opening is set and extends to the plate neighboring, projecting rib and the interlock intersected with each other of scroll electrode assemblie end face that the downward flange in the marginal portion of opening forms, and be welded to one another in a plurality of positions; This current-collector lug is partly drawn from main part, and top and shape for hat terminal are welded to one another and conducting.

2, alkaline secondary cell as claimed in claim 1 is characterized in that: the part opening of described current collector body part is near the hole heart, its projecting rib can with the inside circumference interlock welding of scroll electrode assemblie.

3, alkaline secondary cell as claimed in claim 2 is characterized in that: the number of the part opening of the described close hole heart is 25%～50% of an opening sum.

4, as any one described alkaline secondary cell in the claim 1 to 3, it is characterized in that: the number of the opening of described current collector body part is 2～7.