A kind of battery pole group and collector combining structureTechnical field
The utility model belongs to battery manufacturing field, particularly relates to a kind of battery pole group and collector combining structure.
Background technology
Battery is without under service condition, and electricity reduces automatically or the phenomenon that disappears is called self discharge, and self-discharge phenomenon can affect the useful life of battery.The internal resistance of battery refers to that battery operationally, and electric current flows through the resistance suffered by inside battery, and it comprises ohmic internal resistance and polarization resistance; Internal resistance can affect the discharge platform of battery, and battery increases with internal resistance, and discharge platform can reduce, and battery performance also can decline.Promoting its discharge platform while how reducing self-discharge of battery is the problem that those skilled in the art pay close attention to always.
Current battery pole group and the way of current collector structure: separate with diaphragm paper between both positive and negative polarity pole piece, flatten pole group after winding together, then spot welding collector, and the thickness of its collector is generally 0.15mm.
On this basis, want while reduction self-discharge of battery, to promote its discharge platform further, promoting the electrical property of battery, is a technical problem received much concern.
Summary of the invention
For solving the problem, the utility model provide a kind of reduce self-discharge of battery while promote the battery pole group of discharge platform and collector combining structure, concrete scheme is as follows:
A kind of battery pole group and collector combining structure, comprise pole group and collector; Described pole group comprises positive plate, negative plate and the diaphragm paper between positive plate and negative plate composition; Described collector connects the positive plate of pole group; Described negative plate surface is provided with polytetrafluoroethylene floor, and the thickness of described collector is more than 0.2mm.
Preferably, the thickness of described polytetrafluoroethylene floor is 0.005-0.01mm.
Preferably, the thickness of described collector is 0.2-0.25mm.
Preferably, described pole group is the column of positive plate, negative plate and diaphragm paper winding.
Preferably, in the column pole group of described winding, negative plate extends the bottom of column pole group, and positive plate extends the top of column pole group; Diaphragm paper is between positive plate and negative plate, and its upper end is between the upper end and the upper end of positive plate of negative plate; Its lower end is between the lower end and the lower end of positive plate of negative plate.
One end that described positive plate extends column pole group is pressing end, and the end face of pressing end is the plane that pressing end is formed after the group axis direction pressing of column pole; Described collector is connected with the end face of pressing end.
Preferably, described collector is made up of the chassis of circle and the Liang Zhi ear of connecting base plate side, and Liang Zhi ear is symmetrical on the side of chassis; The center on collector chassis is provided with circular hole; The circular of center chassis is provided with two small sircle holes, and small sircle hole is mainly used in the absorption of alkali lye.
Preferably, the chassis of described collector is connected by spot welding with the end face of the pressing end of positive plate.
Preferably, described negative plate is copper alloy, utilizes copper mesh rolls alloyed powder (dry method) to make, and described alloyed powder comprises nickel, cobalt, rare earth.
Described positive plate is carrier with nickel foam, rolls mixed powder and makes mixture, and described mixed powder comprises nickel, cobalt, zinc; Positive plate does not roll mixed powder near the region of pressing end 2-3mm, does not roll mixed powder region and forms nickel foam end face for pressing, but the region of rolling mixed powder needs all to be covered by diaphragm paper.
The thickness of polytetrafluoroethylene is 0.005-0.01mm, and this polytetrafluoroethylene should not be too thick, if its heavy-current discharge platform too thick can be deteriorated, if its self discharge too thin is difficult to reduce; Collector thickness is preferably 0.20mm, and its thickness is more thick better theoretically, but thickness be greater than 0.25mm operation easier can be larger, qualification rate can be affected.
The utility model is after negative plate surface arranges polytetrafluoroethylene floor, and self-discharge of battery can reduce, but its internal resistance increases, and internal resistance increases makes battery discharge platform reduce; And changing collector thickness into 0.2mm more than by 0.15mm, collector resistance decreasing, internal resistance of cell value is diminished, and discharge platform raises; It is less that the two combines self discharge when can make high-rate battery discharge, and discharge platform remains unchanged or promotes further, and battery performance is promoted further.
Accompanying drawing explanation
Fig. 1 is the structure chart of battery pole group and collector combining structure in the utility model embodiment;
Fig. 2 is the Rotating fields sectional view of the utility model embodiment battery pole group;
Fig. 3 is the Rotating fields expanded view of the utility model embodiment battery pole group.
Embodiment
In order to more fully understand technology contents of the present utility model, below in conjunction with specific embodiment the technical solution of the utility model being introduced further and illustrating.
Embodiment
Battery pole group as Figure 1-3 and collector combining structure, comprise battery pole group 6 and collector 5.
Battery pole group 6 is made up of positive plate 1, negative plate 2, diaphragm paper 3, polytetrafluoroethylene floor 4.Positive plate 1 is carrier with nickel foam, rolls mixed powder and makes mixture, and wherein mixed powder comprises nickel, cobalt, zinc, and mixed powder is not rolled in the region reserving 2-3mm of nickel foam; Negative plate is copper mesh rolls alloyed powder (dry method) to make, and alloyed powder comprises nickel, cobalt, rare earth; Polytetrafluoroethylene floor 4 is coated in the surface of negative plate 2, and thickness is 0.005-0.01mm; Diaphragm paper 3 is between positive plate 1 and negative plate 2; Positive plate 1, diaphragm paper 3, negative plate 2 misplace stacked in the direction of the width successively, and then reel pillared battery pole group 6 along its length.
The upper end of the pillared pole group 6 that reels extends one side that positive plate 1 does not roll mixed powder, and the other end extends negative plate 2.The upper end of diaphragm paper 3 higher than the upper end of negative plate 2, lower than the upper end of positive plate 1; Lower end, higher than the lower end of negative plate 2, lower than the lower end of positive plate 1, makes positive plate 1 and negative plate 2 keep apart.It should be noted that, diaphragm paper 3 is preferably lower than positive plate upper end 1-2mm, to ensure that diaphragm paper 3 positive plate 1 will roll the region overlay of mixed powder.
One end that positive plate 1 extends pole group 6 is pressing end, and pressing end does not roll the region of mixed powder through forming an end face after the pressing of pole group 6 axis direction, and this end face is for connecting collector 5.
Collector 5 is made up of the chassis 51 of circle and the Liang Zhi ear 52 of connecting base plate 51 side, and thickness is 0.2mm.Liang Zhi ear 52 is symmetrical on the side of chassis 51; The center on collector 5 chassis 51 is provided with circular hole 53; The circular hole 53 surrounding symmetry at center, chassis 5 be provided with two small sircle holes 54.
Chassis 51 on collector 5 is connected by spot welding with the end face of the pressing end of positive plate 1.
The above only further illustrates technology contents of the present utility model with embodiment; so that reader is easier to understand; but do not represent execution mode of the present utility model and be only limitted to this, any technology done according to the utility model extends or recreation, all by protection of the present utility model.