The electric core and the coiling type lithium battery of coiling type lithium battery
Technical field
The present invention relates to field of batteries, especially relate to a kind of electric core and coiling type lithium battery of coiling type lithium battery.
Background technology
Storage battery kind as energy storage unit has lead-acid battery, Ni-MH battery, lithium battery etc., and the price of lead acid accumulator is minimum, and its shortcoming is that specific volume is little, that is to say, under same capacity, battery weight and volume are all big, and efficiency for charge-discharge is low, and the life-span is short; The specific volume of Ni-MH battery is well more a lot of than lead acid accumulator, and the life-span of cell is also relatively good, and its large current density electrical characteristics are also good than lead acid accumulator, but compare with lithium battery, and its raw-material cost is in rising trend; The specific volume of lithium battery is better than Ni-MH battery, and the parameter of its weight, charge efficiency and life-span aspect is also all good than Ni-MH battery.Therefore, lithium battery is able to use widely at present, and more high-energy, the development of bigger sense of current of lithium battery forward.
Making the comparatively general method of lithium battery electric core now is to adopt stacked and takeup type dual mode.
Stacked is earlier positive plate and negative plate all to be die-cut into small pieces one small pieces, has lug on the every pole piece, the positive plate of small pieces and negative plate is separated with lamination machine slices with barrier film to gather into folds again; Draw positive pole and negative pole after more all anode ears and negative electrode lug being welded together respectively, the internal resistance of cell of this structure is less, and specific power is big; But in order to guarantee to cut precision, high to cutting the mould and die accuracy requirement, equipment drops into high; And technology is comparatively complicated, and production efficiency is low.
Coiled lithium battery cell is strip positive plate and negative plate to be separated being stacked together back with barrier film form with special-purpose core winding machine coiling; Conventional mode is to reserve a part of non-coating at an end of pole piece; Lug is welded in this non-coating draws anodal and negative pole (as shown in Figure 1); The defective that the electric core of this structure exists is: derive or import because battery electric current when charge and discharge all will be concentrated from an end of lug, cause on CURRENT DISTRIBUTION highly inhomogeneously, electrochemical polarization is very serious; The internal resistance of battery is big, and rapid heating phenomenon takes place under the situation of power charge and discharge.
China's CN101106203A patent " lithium battery and manufacturing approach thereof with new electrode structure " discloses a kind of core strueture of lithium battery; This structure is on pole piece, to be provided with a plurality of lug sheets with preset distance, so that a plurality of lug sheet overlaids form lug after reeling.The mode that this kind is provided with a plurality of lug sheets has reduced the internal resistance of battery to a certain extent, has solved the uneven problem of CURRENT DISTRIBUTION.But its lug sheet is to be provided with at interval, because of certain distance (as for 100 meters long pole pieces, therebetween at a distance from about 10 meters) is still arranged at interval, still exists the internal resistance of cell big to a certain extent, the uneven problem of CURRENT DISTRIBUTION.
Summary of the invention
Problem to be solved by this invention is the defective that overcomes above-mentioned prior art, effectively solves the uneven problem of coiled lithium battery cell CURRENT DISTRIBUTION, and the electric core and the coiling type lithium battery of the little coiling type lithium battery of a kind of internal resistance of cell is provided.
Technical scheme of the present invention is: the electric core of coiling type lithium battery of the present invention comprises positive plate, negative plate, barrier film, anode collection plate and negative pole currect collecting plate; The upper end of said positive plate and the lower end of said negative plate are provided with uncoated blank tape; After said positive plate and said negative plate separate coiling with barrier film; The blank tape of the formation circle on said anode collection plate lower surface and the said positive plate is closely contact mutually, and the blank tape of the formation circle on said negative pole currect collecting plate upper surface and the said negative plate closely contacts mutually.
The inside bending of blank tape of the formation circle of said positive plate and said negative plate all overlaps the every circle of blank tape mutually with the inner ring that is adjacent.
The upper surface of said anode collection plate is provided with some radial slots that are uniformly distributed with and reaches roughly the connector of shape axisymmetricly; Said anode collection plate is provided with the hole that at least one electrolysis liquid injects.
The lower surface of said negative pole currect collecting plate is provided with some radial slots that are uniformly distributed with; Said negative pole currect collecting plate is provided with the logical hole of at least one electrolysis flow.
Coiling type lithium battery of the present invention comprises battery container, is positioned over coiling electricity core and cell cover in the battery container; Said electric core comprises positive plate, negative plate, barrier film, anode collection plate and negative pole currect collecting plate; The upper end of said positive plate and the lower end of said negative plate are provided with uncoated blank tape; After said positive plate and said negative plate separate coiling with barrier film; The blank tape of the formation circle on said anode collection plate lower surface and the said positive plate is closely contact mutually, and the blank tape of the formation circle on said negative pole currect collecting plate upper surface and the said negative plate closely contacts mutually; Said anode collection plate is electrically connected with said cell cover, and said negative pole currect collecting plate is electrically connected with said housing.
Between said anode collection plate and the said battery container, between said cell cover and the said battery container insulated enclosure circle is housed all.
Said cell cover is provided with liquid injection port.
The invention has the beneficial effects as follows: the present invention is provided with uncoated blank tape in the upper end and the negative plate lower end of positive plate respectively; After positive plate and negative plate separated coiling with barrier film; The blank tape that forms circle on anode collection plate lower surface and the positive plate closely contacts; The blank tape that forms circle on negative pole currect collecting plate upper surface and the negative plate closely contacts; Draw positive pole and negative pole by anode collection plate and negative pole currect collecting plate respectively, solved the uneven problem of CURRENT DISTRIBUTION dramatically, reduced the internal resistance of battery; The inside bending of blank tape of the formation circle of positive plate and negative plate all overlaps the every circle of blank tape mutually with the inner ring that is adjacent; Can guarantee that each point on the blank tape all links to each other with collector plate, thus the heat that can effectively derive or import electric current and effectively derive electric in-core portion; Anode collection plate upper surface and negative pole currect collecting plate lower surface are equipped with some radial slots that are uniformly distributed with, and reduce the collector plate thickness of trench bottom, can make the laser penetration collector plate realize effectively welding between collector plate and the pole piece.
Description of drawings
Fig. 1 is the structural representation of a kind of pole piece of prior art;
Fig. 2 is the structural representation of the another kind of pole piece of prior art;
Fig. 3 is the structural representation of positive plate of the present invention;
Fig. 4 is the structural representation of negative plate of the present invention;
Fig. 5 is the structural representation of the present invention's electricity core;
Fig. 6 is the I portion enlarged diagram among Fig. 5;
Fig. 7 is the II portion enlarged diagram among Fig. 5;
Fig. 8 is the plan structure sketch map of anode collection plate of the present invention;
Fig. 9 is the A-A cutaway view among Fig. 8;
Figure 10 is the B-B cutaway view among Fig. 8;
Figure 11 is the structural representation of looking up of negative pole currect collecting plate of the present invention;
Figure 12 is the C-C cutaway view among Figure 11;
Figure 13 is the D-D cutaway view among Figure 11;
Figure 14 is the structural representation of battery of the present invention;
Figure 15 is the sectional structure sketch map of cell cover of the present invention;
Figure 16 is the structural representation of looking up of cell cover of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are done concrete the detailed description.
Like Fig. 5, Fig. 6, shown in Figure 7, the electric core of coiling type lithium battery of the present invention is column type, comprises positive plate 4, negative plate 5, barrier film 6, anode collection plate 7 and negative pole currect collecting plate 8.As shown in Figure 3, positive plate 4 upper ends are provided with uncoated blank tape 41; As shown in Figure 4, negative plate 5 lower ends are provided with uncoated blank tape 51; After positive plate 4 separates coiling with negative plate 5 usefulness barrier films 6; The blank tape 41 of the formation circle on anode collection plate 7 lower surfaces and the positive plate 4 is closely contact mutually; The blank tape 51 of the formation circle on negative pole currect collecting plate 8 upper surfaces and the negative plate 5 is closely contact mutually, and wherein all inside bending of the blank tape of the formation circle of positive plate 4 and negative plate 5 all overlaps the every circle of blank tape mutually with the inner ring that is adjacent.
Like Fig. 8, Fig. 9, shown in Figure 10; Anode collection plate 7 is a disc-shaped plate; Evenly be provided with a plurality of radial slots 71 at anode collection plate 7 upper surfaces, groove 71 radially along elongation the blank tape 41 on positive plate 4 tops is all contacted with the opposite face of bottom land to inner ring from outmost turns.Anode collection plate 4 middle parts are provided with through hole, separate near outer cause radial slot 71 evenly to be provided with a plurality of holes 72, for the injection of electrolyte.Anode collection plate 7 upper surface middle part also are provided with connector 73, and this connector 73 is to be separated a plurality of column-like heads that are centrosymmetric by an annulus column by radial slot 71, and the upper surface of these a plurality of column-like heads is in same plane.
Like Figure 11, Figure 12, shown in Figure 13; Negative pole currect collecting plate 8 also is a circular slab; Lower surface at negative pole currect collecting plate 7 is provided with the radial slot 81 that is uniformly distributed with, groove 81 radially along elongation the blank tape 51 of negative plate 5 bottoms is all contacted with the opposite face of bottom land to inner ring from outmost turns.Negative pole currect collecting plate 8 middle parts are provided with through hole, are separated by radial slot 81 also evenly to be provided with a plurality of holes 82, for the circulation of electrolyte.
On anode collection plate 7 and the negative pole currect collecting plate 8 radial slot is set,, can makes the laser penetration collector plate realize the effective welding between collector plate and the pole piece in order to reduce the collector plate thickness of trench bottom.
Shown in figure 14, coiling type lithium battery of the present invention comprises battery container 9, is positioned over takeup type electricity core and cell cover 10 in the battery container, and electric core comprises positive plate 4, negative plate 5, barrier film 6, anode collection plate 7 and negative pole currect collecting plate 8.
Battery container 9 is cylinders of an open upper end, and its inner bottom part and negative pole currect collecting plate 8 closely contacts and be electrically connected, and outer bottom central authorities are provided with the column type boss, and boss is provided with screw so that the negative pole of battery is connected with external device.
Cell cover 10 is discoid lids (like Figure 15, shown in Figure 16) suitable with battery container 9 tops; The plane that its underpart is provided with downward protrusion closely contacts and is electrically connected with anode collection plate 7; Between anode collection plate 7 and the battery container 9 insulated enclosure circle 11 is housed; Bottom, cell cover 10 upper edge is provided with step 103 to hold the insulated enclosure circle 12 of device between cell cover 10 and the battery container 9; Cell cover 10 center upper portion are provided with column type boss 102 upwards, and boss 102 is provided with screw so that the positive pole of battery is connected with external device.Cell cover 10 is provided with electrolyte inlet 101, and electrolyte injects the back with 13 sealings of sealing nail.
Anode collection plate 7 of the present invention closely contacts to form whole anodal exit with the blank tape 41 of positive plate 4 upper ends; Negative pole currect collecting plate 8 closely contacts to form whole negative pole exit with the blank tape 51 of negative plate 5 lower ends; Thereby reduce the internal resistance of cell; Not only efficiently solve the uneven problem of coiled lithium battery cell CURRENT DISTRIBUTION; And anode collection plate 7 and negative pole currect collecting plate 8 can also effectively derive the heat of electric in-core portion, dispels the heat effectively through battery container 9 and boss on the cell cover 10 then, prolonged the life-span of battery.