CN201904403U

CN201904403U - Special positive electrode for nickel-hydrogen power battery

Info

Publication number: CN201904403U
Application number: CN2010206670396U
Authority: CN
Inventors: 闫钱钱; 郑丽兰; 吉婷; 刘威; 周环波; 詹炳然; 詹金俊; 罗社科
Original assignee: XIAOGAN COLLEGE; Guangzhou Wintonic Battery & Magnet Co Ltd
Current assignee: XIAOGAN COLLEGE; Guangzhou Wintonic Battery & Magnet Co Ltd
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-07-20
Anticipated expiration: 2020-12-17

Abstract

The utility model discloses a special positive electrode for a nickel-hydrogen power battery, comprising three parts of a positive electrode active material coating, a positive electrode current collector, a positive electrode lug and the like, wherein the positive electrode active material coating consists of nano nickel hydroxide, nano graphite powder, PTFE (Polytetrafluoroethylene) emulsion, CMC (Carboxy Methylated Cellulose), carbon nano tube and nano cobalt oxide. The special positive electrode is characterized in that the positive electrode active material coating is coated on a single surface or two surfaces, so as to be stuck on the positive electrode current connector; and the positive electrode lug is welded on a reserved part of the positive electrode current collector made of nickel foils or nickel-aluminum alloy foils by laser or ultrasonic wave and is connected with an exposed part uncoated with positive electrode active materials. In the special positive electrode, the charging and discharging effects of the battery with large current are improved, the current collector is made of the nickel foil or the nickel aluminum alloy foil with smaller thickness and high toughness, more serious burr can not occur when an electrode piece is slit, the phenomenon of the fracture can not occur in the winding or folding process, and problems of short circuit, low volume and the like are effectively reduced, so that the cyclic service life of a produced motive power battery is prolonged.

Description

The special-purpose positive plate of a kind of Ni-MH power cell

Technical field

The utility model relates to battery and makes the field, more specifically relates to the special-purpose positive plate of a kind of Ni-MH power cell.The Ni-MH power cell battery anode slice that the utility model is designed can be used for making the takeup type or the collapsible ni-mh electrokinetic cell of various models.

Background technology

At present, the positive plate that the various model Ni-MH batteries that existing industry is made are used generally by: ball-shape nickel hydroxide (being called for short " ball nickel ") for positive active material, graphite are that conductive agent, PTFE emulsion are that bonding agent, CMC are that thickener and cobalt oxide are the cathode mix of forming of additive, nickel foam is that plus plate current-collecting body, nickel plated steel strip or nickel strap are that part constituted three of lugs etc.By the anode of nickel-metal hydride battery of prior art manufacturing because the collector that uses is nickel foam, in making the process of positive plate because burst or slicing process, inevitable generation metal nickel wire is exposed to the situation outside the active material, promptly produces so-called " burr " phenomenon; In addition, because the nickel foam of using is thicker relatively, the positive plate pliability of manufacturing is relatively poor, in coiling or the folding process damaged or fracture can take place; Because the ball-shape nickel hydroxide particle is thicker, thereby the inhomogeneous problems such as attached material heterogeneity in the starching process, dry back shedding or dry linting that influence can appear in the slurry of manufacturing.Because phenomenons such as burr, breakage or fracture, attached material are inhomogeneous, shedding or dry lintings, make the battery of existing technology manufacturing occur that high current charge-discharge weak effect, micro-short circuit, pole piece damage, battery capacity does not reach design capacity, recycle a series of problems such as the life-span is short.

The utility model content

In order to solve above-mentioned prior art problem, the purpose of this utility model is to be to provide a kind of Ni-MH power cell special-purpose positive plate, improved the high current charge-discharge effect of battery, because having adopted thickness is less, toughness the is high nickel foil or the material of nickel alumin(i)um alloy paper tinsel is collector, cut pole piece and can not produce more serious burr, the fracture imagination can not appear in winding process or folding process, effectively reduced problems such as short circuit, low capacity, thus the life-span that recycles of having improved the electrokinetic cell of producing.

The utility model is achieved by following technical proposals:

The special-purpose positive plate of a kind of Ni-MH power cell, the special-purpose positive plate of described a kind of Ni-MH power cell comprise that three parts such as positive active material coating 1, plus plate current-collecting body 2 and positive pole ear 3 constitute.The annexation of three parts is: the positive active material coating is that positive active material, Nano graphite powder are that conductive agent, PTFE emulsion, CMC, carbon nano-tube, nanometer cobalt oxide are formed by: nano-sized nickel hydroxide; The positive active material coating is coated in single face or dual coating, is adhered on the plus plate current-collecting body.Positive pole ear 3 usefulness laser welding or supersonic welding are connected to the reservation of nickel foil or nickel alumin(i)um alloy paper tinsel plus plate current-collecting body 2, the exposed part of uncoated positive active material is connected.

Further, the utility model comprises following content:

The special-purpose positive plate of described a kind of Ni-MH power cell, it is characterized in that, described positive active material coating is that positive active material, Nano graphite powder are conductive agent, PTFE emulsion (20 ~ 35% solution) for bonding agent, CMC (10 ~ 25% solution) are additive for thickener and carbon nano-tube and nanometer cobalt oxide by: nano-sized nickel hydroxide, is that the mixture of 80～100:10～25:0.5～2:5～15:5～10:1～3 is formed by mass ratio; Make through operations such as slurrying, coating and dryings, single face or dual coating, be adhered on the plus plate current-collecting body.

The special-purpose positive plate of described a kind of Ni-MH power cell is characterized in that: described plus plate current-collecting body is that the material of 0.01～0.5mm nickel foil or nickel alumin(i)um alloy paper tinsel is made by thickness.

The special-purpose positive plate of described a kind of Ni-MH power cell, it is characterized in that: described positive pole ear is that nickel strap or the nickel alumin(i)um alloy band of 0.02～0.5mm made by thickness, becomes one through laser welding or ultrasonic bonding and nickel foil or nickel alumin(i)um alloy paper tinsel plus plate current-collecting body.

Adopt the technical solution of the utility model, can obtain following obvious effects: the Ni-MH power cell of producing with the special-purpose positive plate of a kind of Ni-MH power cell of technical solutions of the utility model manufacturing, because adopting the less nano-sized nickel hydroxide of particle diameter is positive active material, Nano graphite powder is a conductive agent, carbon nano tube and numb cobalt oxide are anode additive, thereby make that the anode sizing agent of making is even, attached material homogeneous on the collector in the coating process, problems such as shedding or dry linting can not occur after the drying, thereby make the battery of producing to make full use of positive active material and improve the battery actual capacity; Simultaneously owing to use Nano graphite powder to be anode additive, thereby improved the high current charge-discharge effect of battery greatly as conductive agent, carbon nano-tube and nanometer cobalt oxide; Because having adopted thickness is less, toughness the is high nickel foil or the material of nickel alumin(i)um alloy paper tinsel is collector, cut pole piece and can not produce more serious burr, the fracture imagination can not appear in winding process or folding process, can effectively reduce problems such as short circuit, low capacity, thereby improve the life-span that recycles of the electrokinetic cell of producing.

The utility model is applicable to the Ni-MH battery of all kinds, various models.

Description of drawings

Fig. 1 is the schematic top plan view of the special-purpose positive plate of a kind of Ni-MH power cell: (Fig. 1 a) and three lugs (Fig. 1 b) electrode for two lugs;

Fig. 2 is the schematic side view of the special-purpose positive plate of a kind of Ni-MH power cell: two lug coated on both sides (Fig. 2 a), four lug coated on both sides (Fig. 2 b) and two lug single face coating (Fig. 2 c) electrodes;

Fig. 3 is the schematic perspective view of the special-purpose positive plate of a kind of Ni-MH power cell: the monopole ear coated on both sides (Fig. 3 a), two lug coated on both sides (Fig. 3 b) and monopole ear single face coating (Fig. 3 c) electrode.

Wherein: positive active material coating 1, collector 2, positive pole ear 3.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail:

As Fig. 1, Fig. 2 and shown in Figure 3, be schematic top plan view, schematic side view and the schematic perspective view of the special-purpose positive plate of a kind of Ni-MH power cell of the utility model specific embodiment.The utility model is the special-purpose positive plate of a kind of Ni-MH power cell, and the special-purpose positive plate of this Ni-MH power cell is by three parts: positive active material coating 1(Fig. 1, Fig. 2 and Fig. 3), collector 2(Fig. 1, Fig. 2 and Fig. 3), positive pole ear 3(Fig. 1, Fig. 2 and Fig. 3).The annexation of three parts is: positive active material coating 1 is that positive active material, Nano graphite powder are that conductive agent, PTFE emulsion, CMC, carbon nano-tube, nanometer cobalt oxide are formed by: nano-sized nickel hydroxide; Positive active material coating 1 is coated in single face or dual coating, is adhered on the plus plate current-collecting body 2.Positive pole ear 3 usefulness laser welding or supersonic welding is connected to the reservation of nickel foil or nickel alumin(i)um alloy paper tinsel plus plate current-collecting body 2, the exposed part of uncoated positive active material is connected.

Described plus plate current-collecting body (2) thickness is 0.01～0.5mm.

Described positive pole ear (3) thickness is 0.02～0.5mm.

Yet the above is a preferred embodiment of the present utility model only, is not so limits to scope of the present utility model, and equivalences that all utilization the utility model description are carried out change, and all are included in equally in the scope of the present utility model.

Claims

1. the special-purpose positive plate of a Ni-MH power cell, it is characterized in that: positive active material coating (1) is coated in single face or dual coating, be adhered on the plus plate current-collecting body (2), positive pole ear (3) with laser welding or supersonic welding be connected to the reservation of nickel foil or nickel alumin(i)um alloy paper tinsel plus plate current-collecting body (2), the exposed part of uncoated positive active material is connected.

2. the special-purpose positive plate of a kind of Ni-MH power cell according to claim 1, it is characterized in that: described plus plate current-collecting body (2) thickness is 0.01～0.5mm.

3. the special-purpose positive plate of a kind of Ni-MH power cell according to claim 1, it is characterized in that: described positive pole ear (3) thickness is 0.02～0.5mm.