CN2717038Y

CN2717038Y - Laminated lithium ion secondary battery

Info

Publication number: CN2717038Y
Application number: CNU2004200720273U
Authority: CN
Inventors: 肖峰; 吴光麟; 孙华军
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2004-07-23
Filing date: 2004-07-23
Publication date: 2005-08-10
Anticipated expiration: 2014-07-23

Abstract

The utility model relates to a laminated lithium-ion secondary battery with high space utilization rate, vibration resistance, drop resistance and excellent safety performance. The positive pole piece and the negative pole piece are sequentially stacked and arranged on both sides of the diaphragm to form an electrode core, and the battery is stored In a battery case with an opening at one end, the opening is sealed by a battery cover plate, and the positive and negative electrodes are formed by coating active materials on the surface of the substrate, and the thin neck extending from the substrate constitutes a current collector, wherein , the current collector is connected to the metal sheet, and the other ends of the metal sheet are connected to the terminals of the battery cover respectively, and an insulating tape for isolation is pasted on the metal sheet.

Description

Laminated Type Lithium Ion Secondary Battery

[technical field]

The utility model relates to a kind of lithium rechargeable battery, relates to a kind of anti-vibration, anti-drop, Laminated Type Lithium Ion Secondary Battery that security performance is excellent more specifically.

[background technology]

Along with the develop rapidly of science and technology, the miniaturization of electronic instrument and electronic equipment is more and more higher to the performance requirement of secondary cell, and from the combination property aspect, lithium rechargeable battery is the high energy secondary cell that has development and application prospect most.At present on market extensive use be that the cylindrical shape electricity core of and negative pole manufacturing anodal by membrane coil strip winding shape is contained in the cylindrical lithium ion secondary battery in the battery case, or after flat moulding, be contained in the square lithium ion secondary battery that forms in the rectangular cell shell by the electric core of membrane coil strip winding shape positive pole and negative pole manufacturing.

Square lithium ion secondary battery is widely used in the field of battery of mobile phone at present.At present requirement to lithium rechargeable battery high power capacity and heavy-current discharge performance, for improving the space availability ratio and the high-rate discharge ability of square lithium ion secondary battery, proposed afterwards by positive plate, negative plate stacks gradually the two sides that is arranged in barrier film and constitutes electrode cores, positive plate is to be that active material is coated in the aluminium foil matrix surface and forms by the composite oxides that contain the lithium that can embed and deviate from lithium ion and transition metal, the venturi portion that is extended out by the aluminium foil matrix is the collector of positive plate, negative plate is to be that active material is coated in the Copper Foil matrix surface and forms by containing the material with carbon element that can embed and deviate from lithium ion, and the venturi portion that is extended out by the Copper Foil matrix is the collector (as Fig. 1) of negative plate.Like this, positive plate, barrier film and negative plate stack gradually the Stacked Lithium Ion Secondary Battery with multilayer collector that forms, and its energy density and big multiplying power discharging property all are better than the lithium rechargeable battery that only has one deck collector (being lug again) by the formation of reeling.

At present, the multilayer collector of positive and negative plate is directly to be welded on positive and negative end of battery cover board, but the problem of this existence is: 1, easy sealing-off, because the material of cover plate generally is aluminium sheet or steel plate, the multilayer collector welds with it, insecure easy sealing-off.And, be difficult to resist vibration or fall because of no pooling feature.2, take up room, extend to the multilayer collector that welds with cover plate and can take many inside batteries space, reduce the battery space utilance.3, easy internal short-circuit does not have quarantine measures between another utmost point of multilayer collector and cover plate or the battery case, and in the process of vibrating or falling, another utmost point of multilayer collector and cover plate or shell contact the generation internal short-circuit easily, makes the battery heating even causes blast, and is dangerous.

Therefore, designing a kind of space availability ratio height, anti-vibration, Laminated Type Lithium Ion Secondary Battery anti-drop and that security performance is excellent is the problem that industry presses for solution.

[utility model content]

In view of the above-mentioned defective that exists in the prior art, the technical problems to be solved in the utility model is to provide a kind of space availability ratio height, anti-vibration, anti-drop and Laminated Type Lithium Ion Secondary Battery that security performance is excellent.

The purpose of this utility model is achieved through the following technical solutions:

A kind of Laminated Type Lithium Ion Secondary Battery, by positive plate, negative plate stacks gradually the two sides that is arranged in barrier film and constitutes electrode cores 3, and be accommodated in the open-ended battery case 5, peristome is by battery cover board 7 sealings, described positive plate, negative plate forms by active material is coated in matrix surface, the venturi portion that is extended out by matrix constitutes collector, wherein, collector 2 is connected with a sheet metal 6, collector 4 is connected with a sheet metal 8, sheet metal 6 is connected with the battery cover board two-terminal respectively with 8 the other end, has posted the insulating tape of buffer action on the sheet metal 6.

Technique scheme further is improved to:

In the utility model Laminated Type Lithium Ion Secondary Battery, on collector 2, posted the insulating tape of buffer action.

In the utility model Laminated Type Lithium Ion Secondary Battery, collector 2 is connected with sheet metal 6, the other end of sheet metal 6 with one from cover plate terminal 12 extended conductive clips 10 be connected.

In the utility model Laminated Type Lithium Ion Secondary Battery, the two ends of sheet metal 6 are electric resistance welding with cover plate terminal 12 with collector 2 and are connected.

In the utility model Laminated Type Lithium Ion Secondary Battery, the two ends of sheet metal 6 are electric resistance welding with conductive clips 10 with collector 2 and are connected.

In the utility model Laminated Type Lithium Ion Secondary Battery, the two ends of sheet metal 8 are supersonic welding with cover plate terminal 14 with collector 4 and are connected.

In the utility model Laminated Type Lithium Ion Secondary Battery, described positive plate, negative plate and barrier film are the routine techniquess that adopts existing lithium rechargeable battery to make, and there is no particular limitation.Wherein positive plate is to be that active material is coated in the aluminium foil matrix surface and forms by the composite oxides that contain the lithium that can embed and deviate from lithium ion and transition metal, and negative plate is to be that active material is coated in the Copper Foil matrix surface and forms by containing the material with carbon element that can embed and deviate from lithium ion.The routine techniques that described battery case and battery cover board also adopt existing lithium rechargeable battery to make, there is no particular limitation.

The advantage of the utility model Laminated Type Lithium Ion Secondary Battery is:

(1), because of needn't directly being connected with cover plate with the collector of multilayer, the sheet metal of using individual layer instead connects, thereby has omitted part multilayer collector occupation space.

(2), be connected with collector with cover plate, can improve welding effect, prevent the phenomenon of sealing-off, improve resistant and oscillation resistant and fallen ability because of adopting the single-layer metal sheet.

(3), because of on sheet metal and collector, having pasted the insulating tape of a buffer action, prevented between sheet metal in vibration or the falling process or collector and the shell or with another utmost point of cover plate between contact, thereby prevented internal short-circuit.

(4), adopted the conductive clips structure, enlarge bonding area on the one hand, improve welding effect, avoid on the other hand because of the cover plate two-terminal closely, the easy contact of two collectors and internal short-circuit takes place.

(5), if battery adopts aluminum shell and aluminium cover plate structure commonly used, then adopt sheet metal 6 to be the nickel sheet, be connected with adopting electric resistance welding between collector and the cover plate terminal, sheet metal 8 is an aluminium flake, and adopt the supersonic welding ways of connecting between collector and the cover plate terminal, can improve weld strength, further improve resistant and oscillation resistant and fallen ability.

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 utility model Laminated Type Lithium Ion Secondary Battery positive plate and negative plate shape schematic diagram.

Fig. 2 is the annexation figure of the preceding sheet metal 6 of the utility model Laminated Type Lithium Ion Secondary Battery sealing.

Fig. 3 is the partial enlarged drawing of Fig. 2.

Fig. 4, Fig. 5 paste the insulating tape schematic diagram on the utility model Laminated Type Lithium Ion Secondary Battery sheet metal 6 and the collector 2.

Fig. 6 is the annexation figure of the preceding sheet metal 8 of the utility model Laminated Type Lithium Ion Secondary Battery sealing.

[embodiment]

As shown in Figure 1, in the utility model Laminated Type Lithium Ion Secondary Battery, positive plate is to be that active material is coated in the aluminium foil matrix surface and forms by the composite oxides that contain the lithium that can embed and deviate from lithium ion and transition metal, negative plate is to be that active material is coated in the Copper Foil matrix surface and forms by containing the material with carbon element that can embed and deviate from lithium ion, the venturi portion that extends out from aluminium foil and Copper Foil constitutes collector respectively, be connected with miscellaneous part, play the effect of drawing and introduce electric current.Positive and negative plate is as shown in Figure 1 stacked gradually the two sides that is arranged in barrier film, just constituted the lamination type electric pole piece.

As Fig. 2, shown in Figure 3, above-mentioned electrode cores 3 is accommodated in the battery case 5, battery case 5 adopts aluminum hull, constitutes collector 2 from the extended part of the Copper Foil of negative plate, and sheet metal 6 is the nickel sheet.Cover plate 7 is an aluminium cover plate, and cover plate terminal 12 is a nickel matter rivet, by the insulating resin seal isolation, is electrically connected with the battery positive and negative plate respectively between cover plate terminal 12 and the cover plate 7, has constituted as battery two electrodes that connect external circuit.Conductive clips 10 is nickel sheet or nickel plating sheet metal, one end and 12 riveted joints of cover plate terminal, the other end and sheet metal 6 adopts electric resistance weldings to be connected, and the other end of sheet metal 6 also adopts electric resistance welding to be connected with collector 2, because be connected more firm between nickel sheet and nickel sheet or the copper sheet with electric resistance welding.Sheet metal 8 is an aluminium flake, constitutes collector 4 from the extended part of the aluminium foil of positive plate, and an end of sheet metal 8 adopts supersonic welding to be connected with collector 4, because connect more firm with supersonic welding between the aluminium flake.In the secondary cell of the present utility model, sheet metal 6 also can directly carry out resistance welded with the cover plate terminal that does not have conductive clips 10, can realize welding effect equally.

As Fig. 4, shown in Figure 5, conductive clips 10 is turn 90 degrees according to the default indentation folding on it, insulating tape is wrapped on the structure of forming by collector 2, sheet metal 6, conductive clips 10 again.Conductive clips is returned to original position, as shown in Figure 6, adopts supersonic welding to be connected the other end of sheet metal 8 and cover plate terminal 14 (in fact just aluminium cover plate itself) again.At last electrode cores 3 is sunk in the battery case 5 fully, cover plate and aluminum hull are carried out the Laser Welding sealing, and finish follow-up making step in the usual way.

The utility model Laminated Type Lithium Ion Secondary Battery also can adopt box hat and steel cover plate shell and the cover plate as battery, the same, electrode cores 3 is accommodated in the battery case 5, battery case 5 adopts box hat, constitutes collector 2 from the extended part of the aluminium foil of positive plate, and cover plate 7 is the steel cover plate, cover plate terminal 12 is an aluminium matter rivet, by the insulating resin seal isolation, be electrically connected with the battery positive and negative plate respectively between cover plate terminal 12 and the cover plate 7, constituted two electrodes of battery connection external circuit.Sheet metal 6 is an aluminium flake, the two ends of sheet metal 6 adopt supersonic welding to be connected with cover plate terminal 12 with collector 2 respectively, sheet metal 8 is the nickel sheet, constitutes collector 4 from the extended part of the Copper Foil of negative plate, and the two ends of sheet metal 8 adopt electric resistance welding to be connected with collector 4 and cover plate terminal.The box hat battery except above-mentioned welding manner with aluminum hull is different, it is fully identical with aluminum-shell battery that it pastes step such as insulating tape.

Claims

1. A laminated lithium-ion secondary battery, consisting of a positive electrode sheet and a negative electrode sheet sequentially stacked on both sides of the diaphragm to form an electrode core (3), and accommodated in a battery case (5) with an open end, the opening Sealed by the battery cover plate (7), the positive electrode sheet and the negative electrode sheet are formed by coating the active material on the surface of the substrate, and the thin neck part extending from the substrate constitutes the current collector, which is characterized in that the current collector (2) It is connected with a metal sheet (6), the current collector (4) is connected with a metal sheet (8), and the other ends of the metal sheets (6) and (8) are respectively connected with the two terminals of the battery cover, and the metal sheet (6) Insulating tape for isolation is pasted on it.

2. The laminated lithium-ion secondary battery according to claim 1, characterized in that an insulating adhesive tape for isolation is pasted on the current collector (2).

3. The laminated lithium-ion secondary battery according to claim 1 or 2, characterized in that the current collector (2) is connected to the metal sheet (6), and the other end of the metal sheet (6) is connected to a secondary cover plate The conductive leads (10) extending from the terminals (12) are connected to each other.

4. The laminated lithium-ion secondary battery according to claim 1 or 2, characterized in that the metal sheet (6) is a nickel sheet, and the two ends of the nickel sheet are connected to the cover plate terminal (12), the current collector (2 ) are connected by resistance welding.

5. The laminated lithium-ion secondary battery according to claim 3, characterized in that the metal sheet (6) is a nickel sheet, and both ends of the nickel sheet are connected to the conductive lead sheet (10) and the current collector (2). For resistance welded connections.

6. The laminated lithium-ion secondary battery according to claim 1 or 2, characterized in that the metal sheet (8) is an aluminum sheet, and the two ends of the aluminum sheet are connected to the cover plate terminal (14) and the current collector (4) ) are connected by ultrasonic welding.

7. The laminated lithium-ion secondary battery according to claim 3, characterized in that the metal sheet (8) is an aluminum sheet, and the two ends, the cover plate terminal (14) and the current collector (4) are ultrasonic Solder connection.