CN205319259U

CN205319259U - Cylindrical lithium ion battery rolls up core

Info

Publication number: CN205319259U
Application number: CN201620100015.XU
Authority: CN
Inventors: 陈佩
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2016-06-15
Anticipated expiration: 2026-02-01

Abstract

The utility model provides a cylindrical lithium ion battery rolls up core, it includes anodal pole piece, barrier film and negative pole pole piece to roll up the core, anodal pole piece, barrier film and negative pole pole piece are convoluteed to laminate and are in the same place, anodal pole piece includes the anodal mass flow body and coats anodal mass flow body positive electrode active material on the surface, the negative pole pole piece includes negative current collector and coats negative current collector negative electrode active material on the surface, its characterized in that be equipped with the extension that exceeds this end tip of the anodal mass flow body on negative current collector's the edge one end tip of direction of height, the extension with a negative current collector body coupling. The utility model discloses a make the negative current collector who rolls up core negative pole pole piece be higher than the anodal mass flow body to when making the encapsulation, can connect the some negative current collector that exceed together with direct book of the tip of casing, messenger's casing is with the negative current collector intercommunication and become the negative pole, and then improves casing and negative current collector's area of contact greatly, reaches and reduces internal resistance of cell, improves the purpose of battery performance.

Description

Column lithium ion battery core

[technical field]

The utility model relates to lithium ion battery, can improve contact area in particular to one, thus reduces battery internal resistance, it is to increase the column lithium ion battery core of battery performance.

[background technology]

Column lithium ion battery is the one in lithium ion battery, and it is by cathode pole piece, anode pole piece, electrolyte and prevents the isolation film of short circuit from forming between anode pole piece and cathode pole piece. Anode pole piece and cathode pole piece are processed to thin slice shape usually. By cathode pole piece, isolation film, anode pole piece in order stacking and reel, just cylindrical core is defined, then cylindrical core is loaded by, in the iron of stainless steel, nickel plating or the housing of aluminium, finally injecting electrolyte and just can be packaged into column lithium ion battery. In traditional method for packing, housing is one end open normally, and one end is closed, and core is normally welded with positive pole ear in one end, and the other end is welded with negative lug. During encapsulation, core is inserted in housing by the opening end of housing, make the closed end of negative lug corresponding to housing of core. Then use capillary is from the center of core by being just extremely inserted into negative pole end, negative lug is welded on housing inner bottom part, makes cathode pole piece be connected housing by negative lug, thus make housing become negative pole, completes the encapsulation of negative pole end. The encapsulation that battery is just extreme, positive pole block is normally utilized to block the mode connect: the close end just extreme at housing carries out roller groove, form convex edge in enclosure interior and core is stuck between convex edge and housing bottom, then positive pole block is welded together with anode pole piece, make it conducting, finally enter positive pole block at the opening end card of housing. Thereafter the marginal portion utilizing machinery that housing exceeds positive pole block is inwardly pressed, so that housing button lives positive pole block, makes positive pole cap sealed live the opening end of housing, and limits the displacement of core, thus completes the positive pole encapsulation of battery.

The two ends of traditional core, its anode pole piece and cathode pole piece are concordant respectively, and its negative pole end is connected with housing by welding negative lug, and the contact limited area of solder joint, thus the contact area causing pole piece and housing is less. And the contact area of cathode pole piece and housing is more big, the internal resistance of battery is more little, and the chemical property of battery is more good, and therefore, traditional core, is unfavorable for reducing the internal resistance of the rear battery of encapsulation, is unfavorable for improving the chemical property of battery.

[practical novel content]

The utility model is intended to solve the problem, and provides one can improve cathode pole piece and contact area with housing, thus reduces battery internal resistance, it is to increase the column lithium ion battery core of battery performance.

For achieving the above object, the utility model provides a kind of column lithium ion battery core, described core comprises anode pole piece, isolation film and cathode pole piece, described anode pole piece, isolation film and cathode pole piece winding fit together, the positive electrode active materials that described anode pole piece comprises plus plate current-collecting body and coats on plus plate current-collecting body surface, the negative active core-shell material that described cathode pole piece comprises negative current collector and coats on negative current collector surface, it is characterized in that, the end, one end in the height direction, edge of described negative current collector is provided with the extension portion exceeding this end end of plus plate current-collecting body, described extension portion is connected with described negative current collector one.

Described extension portion is located at the end, one end along height direction of the negative current collector outside core.

The end in described extension portion is concordant with the end along its length of described negative current collector.

Described negative current collector is Copper Foil, and described plus plate current-collecting body is aluminium foil.

Described plus plate current-collecting body is connected with positive pole ear.

Described negative active core-shell material coats the middle part of negative current collector along the length direction of negative current collector, forms the blank district of uncoated negative active core-shell material in the both sides of the edge along height direction of described negative current collector.

Described extension portion is continuous print rectangular configuration.

Described extension portion is made up of some spaced extension portion unit, and described extension portion unit is connected with described negative current collector one respectively.

Favorable attributes of the present utility model is, it efficiently solves the problems referred to above. The utility model is by making the negative current collector of core cathode pole piece higher than plus plate current-collecting body, so that during encapsulation, can by the part negative current collector that exceeds together with the direct cigarette in the end of housing, the housing made directly is connected with negative current collector and becomes negative pole, and then greatly improve the contact area of housing and negative current collector, reach and reduce battery internal resistance, it is to increase the object of battery performance.

[accompanying drawing explanation]

Fig. 1 is structure block diagram of the present utility model.

Fig. 2 is cross-sectional view of the present utility model.

Fig. 3 is using state structure schematic diagram of the present utility model, i.e. the encapsulation structure schematic diagram of core and housing.

Fig. 4 is structure schematic diagram during cathode pole piece of the present utility model expansion.

Fig. 5 is another structure schematic diagram during cathode pole piece of the present utility model expansion.

Wherein, core 1, anode pole piece 11, positive pole ear 111, isolation film 12, cathode pole piece 13, negative current collector 131, negative active core-shell material 132, extension portion 133, extension portion unit 1331, housing 2, convex edge 21, positive pole block a shot 3.

[specific embodiment party formula]

The following example is to further explanation of the present utility model and supplements, and is not constituted any limitation by the utility model.

As shown in Fig. 1～Fig. 5, the broad outlines of column lithium ion battery core of the present utility model is, make the local, end of negative current collector 13 higher than plus plate current-collecting body, so that the negative current collector that local exceeds can be used for directly being fixedly connected with housing, thus reach the object increasing and contacting area with housing, realize reducing battery internal resistance, it is to increase the object of battery performance.

As shown in Figure 2, described core 1 comprises anode pole piece 11, isolation film 12 and cathode pole piece 13.

As shown in Figure 1, described anode pole piece 11 comprises plus plate current-collecting body, positive electrode active materials. Described plus plate current-collecting body and positive electrode active materials all can select known material. Described positive electrode active materials coats the both side surface of described plus plate current-collecting body by known technique. For lithium ion battery, usually choosing aluminium foil as plus plate current-collecting body, therefore, in the present embodiment, described plus plate current-collecting body is aluminium foil. In other embodiments, described plus plate current-collecting body also can be other metal formings. Being connected with positive pole ear 111 on described plus plate current-collecting body, this positive pole ear 111 is for connecting positive pole block 3. Described positive pole ear 111 is connected with described plus plate current-collecting body in known manner.

As shown in Figure 1, described cathode pole piece 13 comprises negative current collector 131, negative active core-shell material 132. Described negative current collector 131 and negative active core-shell material 132 all can select known material. Described negative active core-shell material 132 coats the both side surface of described negative current collector 131 by known technique. For lithium ion battery, usually choosing Copper Foil as negative current collector 131, therefore, in the present embodiment, described negative current collector 131 is Copper Foil, and in other embodiments, described negative current collector 131 also can be other metal formings. As shown in Figure 4, Figure 5, described negative current collector 131 is in strip, described negative active core-shell material 132 coats the mid portion of negative current collector 131 along its length, so that negative current collector 131 is blank district along the both sides of the edge in height direction, uncoated on it have negative active core-shell material 132. The end, one end in the height direction, edge of described negative current collector 131 is provided with the extension portion 133 exceeding this end margin. Described extension portion 133 is connected for being fixed with the end of housing. In the present embodiment, described extension portion 133 is near negative current collector 131 end along its length, and concordant with the end along its length of negative current collector 131, so that when pole piece coiling becomes core 1, the extension portion 133 on cathode pole piece 13 can be positioned at the outermost position of core 1. The shape in described extension portion 133 can be arranged as required, it can be arranged to various ways, as it can be continuous print rectangular configuration (as shown in Figure 4), or can be made up of (as shown in Figure 5) some spaced extension portion unit 1331. For increasing the negative current collector 131 contact area with housing, in the present embodiment, described extension quality award from the ministry selects continuous print rectangular configuration, and its length can reel in annular as good taking the cathode pole piece 13 time delay extending portion 133 that reels. Described extension portion 133 is connected with described negative current collector 131 one, and this extension portion 133 is also Copper Foil.

As shown in Figure 2, described isolation film 12 is located between anode pole piece 11 and cathode pole piece 13, and it is for isolating anode pole piece 11 with cathode pole piece 13 to prevent short circuit. Described anode pole piece 11, isolation film 12, cathode pole piece 13 is superimposed successively and reels and forms core 1. Described cathode pole piece 13 is concordant with one end of anode pole piece 11, and its other end part edge is concordant with anode pole piece 11 edge, and its extension portion 133 is higher than the edge of this end of anode pole piece.

By this, column lithium ion battery core of the present utility model is just defined. During use, as shown in Figure 3, core 1 is inserted in the housing 2 of both ends open, the inside of housing forms the convex edge 21 that can support core in advance, when core is inserted in housing 2, the extension portion 133 of core 1 just can stretch between convex edge 21 and shell end, thus can be fixed together in the extension portion 133 of the end of housing 2 and core negative current collector 131, as jointly by curling outside to inside and link together, and then the housing 2 made becomes negative pole. Owing to the extension portion 133 of negative current collector 133 end of core 1 can directly be connected with housing, thus the contact area of negative current collector 133 with housing 2 is considerably increased, thus it is beneficial to the internal resistance reducing battery, reduce from consuming energy source, reduce fuel factor, improve the discharge-rate of battery, battery is used safer.

Although the utility model having been disclosed by above embodiment, but scope of the present utility model is not limited thereto, when not deviateing the utility model design, above each component can be replaced with the similar or equivalent element that art personnel understand.

Claims

1. a column lithium ion battery core, described core (1) comprises anode pole piece (11), isolation film (12) and cathode pole piece (13), described anode pole piece (11), isolation film (12) and cathode pole piece (13) winding fit together, the positive electrode active materials that described anode pole piece (11) comprises plus plate current-collecting body and coats on plus plate current-collecting body surface, the negative active core-shell material (132) that described cathode pole piece (13) comprises negative current collector (131) and coats on negative current collector (131) surface, it is characterized in that, the end, one end in the height direction, edge of described negative current collector (131) is provided with the extension portion (133) exceeding this end end of plus plate current-collecting body, described extension portion (133) is connected with described negative current collector (13) one.

2. column lithium ion battery core as claimed in claim 1, it is characterised in that, described extension portion (133) is located at the end, one end along height direction of the negative current collector (131) near core (1) outside.

3. column lithium ion battery core as claimed in claim 2, it is characterised in that, the end of described extension portion (133) is concordant with the end along its length of described negative current collector (131).

4. column lithium ion battery core as claimed in claim 3, it is characterised in that, described negative current collector (131) is Copper Foil, and described plus plate current-collecting body is aluminium foil.

5. column lithium ion battery core as claimed in claim 4, it is characterised in that, described plus plate current-collecting body is connected with positive pole ear.

6. column lithium ion battery core as claimed in claim 5, it is characterized in that, described negative active core-shell material (132) coats the middle part of negative current collector (13) along the length direction of negative current collector (13), forms the blank district of uncoated negative active core-shell material (132) in the both sides of the edge along height direction of described negative current collector (13).

7. column lithium ion battery core as claimed in claim 1, it is characterised in that, described extension portion (133) is in continuous print rectangular configuration.

8. column lithium ion battery core as claimed in claim 1, it is characterized in that, described extension portion (133) is made up of some spaced extension portions unit (1331), and described extension portion unit (1331) is connected with described negative current collector (131) one respectively.