CN104779402A - Novel ultrathin battery and preparation method thereof - Google Patents

Abstract

The invention discloses a novel ultra-thin battery and a preparation method thereof, wherein the novel ultra-thin battery comprises a battery positive base material, a battery negative base material, a positive metal net, a negative metal net, a positive granular material, a negative granular material, a barrier parts, the positive and negative tabs of the battery are respectively extended from the positive metal mesh and the negative metal mesh, and the positive metal mesh and the negative metal mesh are respectively bonded to the battery positive substrate and the battery negative substrate. material and the negative electrode granular material are respectively covered on the positive electrode substrate of the battery, the positive electrode metal mesh and the negative electrode substrate of the battery, and the negative electrode metal mesh. The base material of the positive electrode of the battery and the base material of the negative electrode of the battery are isolated from each other, and the surface of the battery is covered with a flexible insulating sealing layer. The novel ultra-thin battery and the preparation method thereof have the advantages of simplified production process, low battery production cost, large battery capacity, convenient application and the like.

Description

A novel ultra-thin battery and its preparation method

technical field

The invention relates to the application field of batteries, in particular to a novel ultra-thin battery and a preparation method thereof.

Background technique

With the continuous development of battery technology, people put forward more requirements for the performance of batteries. The ultra-thinning of batteries is an important development direction of batteries.

At present, those skilled in the art have realized the ultra-thin design of the battery, and proposed various implementation methods. However, the production and manufacture of ultra-thin batteries in the prior art still has the following defects, such as complex production process, difficult processing, large battery production consumables, high production cost, low battery capacity, insufficient capacity and so on.

The above technical defects seriously limit the development of ultra-thin batteries, and become an obstacle to further popularization and application in this field.

In view of this, the purpose of the present invention is to provide a new technical solution to solve the existing technical problems.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a novel ultra-thin battery and its preparation method, which solves the technical defects of the existing thin battery such as complex production process, many consumables, high cost, and low capacity.

The technical solution adopted by the present invention to solve its technical problems is:

A new type of ultra-thin battery, including battery positive electrode base material, battery negative electrode base material, positive electrode metal mesh, negative electrode metal mesh, positive electrode granular material, negative electrode granular material, and barriers. The negative electrode metal mesh is extended. The positive electrode metal mesh and the negative electrode metal mesh are respectively bonded to the battery positive electrode base material and the battery negative electrode base material. The positive electrode particle material and the negative electrode particle material are respectively covered on the battery positive electrode The net, the battery negative base material, and the negative metal grid, the above-mentioned barrier member is arranged between the battery positive base material and the battery negative base material, and the barrier member blocks the battery positive base material and the battery negative base material from each other.

As an improvement of the above technical solution, the positive electrode base material of the battery and the negative electrode base material of the battery are covered with an adhesive layer, and the positive electrode metal mesh and the negative electrode metal mesh are respectively bonded to the positive electrode base material of the battery and the negative electrode base material of the battery. Adhesive glue layer.

As a further improvement of the above technical solution, the adhesive adhesive layer is one or more mixed adhesive layers in polyethylene/polyethylene/polyimide/acrylic acid/rubber, and the thickness of the adhesive adhesive layer is 1μm-5μm.

As a further improvement of the above-mentioned technical solution, the materials used for the positive electrode base material of the battery and the negative electrode base material of the battery are polyvinyl chloride plastics/polyethylene terephthalate plastics/polyethylene plastics/polypropylene plastics/polystyrene plastics one or two.

As a further improvement of the above technical solution, the thickness of the battery positive electrode substrate and the battery negative electrode substrate is 3 μm-30 μm.

As a further improvement of the above technical solution, the material of the positive electrode metal mesh and the negative electrode metal mesh is a composite metal mesh formed by electroplating one or two or three metals in aluminum mesh/copper mesh/nickel mesh, and its thickness is 5μm-40μm.

As a further improvement of the above technical solution, the positive electrode particle material is one or more mixed materials in lithium cobaltate/lithium manganese oxide/nickel cobalt manganese ternary/lithium iron phosphate, and the negative electrode particle material is graphite/silicon One or more mixtures of powder/silicon-carbon/lithium titanate are mixed to form a material coating thickness of 5 μm-40 μm.

As an embodiment of the above technical solution, the barrier is a diaphragm layer, the material of the diaphragm layer is one or more layers of PP/PE/non-woven fabric, and the surface is coated with PVDF/Al2O3/Si One or more materials of O2, the thickness of the diaphragm layer is 2μm-10μm.

As another embodiment of the above technical solution, the barrier member is a solid electrolyte layer disposed between the battery positive electrode substrate and the battery negative electrode substrate, and the thickness of the solid electrolyte layer is 2 μm-10 μm.

A method for preparing an ultra-thin battery, comprising the following steps:

(1) First prepare the positive electrode sheet of the battery: apply an adhesive layer on the positive electrode substrate of the plastic battery, cover the positive electrode metal mesh, and then grind the positive electrode material into powder to make the positive electrode granular material, and then spray it on the positive electrode metal mesh In the surface and gaps, a positive current collector is made;

(2) Next, prepare the negative electrode sheet of the battery: apply an adhesive layer on the negative electrode base material of the plastic battery, cover the negative electrode metal mesh, and then grind the negative electrode material into powder to make the negative electrode granular material, and spray it on the negative electrode metal mesh In the surface and gap of the negative electrode collector;

(3) Cover the prepared negative electrode sheet with a separator or a solid electrolyte layer, then drop an appropriate amount of electrolyte solution, close the positive electrode sheet, and press to obtain an ultra-thin battery.

The beneficial effects of the present invention are: the present invention provides a novel ultra-thin battery and its preparation method, the battery and the preparation method do not use the pulping process, which simplifies the production process; in addition, there is no need to use aluminum-plastic film for the outer packaging For battery packaging, there is no need to set up special tabs, which saves production materials, and at the same time can greatly reduce the thickness of the battery, achieve the production of ultra-thin batteries, and increase the capacity of the battery. In addition, the flexible sealing covering layer covering the battery surface can enhance the insulation and reliability of the battery on the one hand, and can also deform the battery on the other hand, which is flexible in application and easy to use. The novel ultra-thin battery and its preparation method solve the technical defects of the existing thin battery such as complex production process, many consumable materials, high cost, and low capacity.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a schematic diagram of the assembly process of the present invention.

Detailed ways

The idea, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts belong to The protection scope of the present invention. In addition, all the connection/connection relationships involved in the patent do not simply refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions. Each technical feature in the invention can be combined interactively on the premise of not conflicting with each other, refer to Fig. 1 and Fig. 2 .

A new type of ultra-thin battery, including battery positive electrode base material 1, battery negative electrode base material 5, positive electrode metal mesh 2, negative electrode metal mesh 4, positive electrode granular material, negative electrode granular material, barrier 3, positive electrode ear and negative electrode ear of the battery respectively Extended from the positive metal mesh 2 and the negative metal mesh 4, the positive metal mesh 2 and the negative metal mesh 4 are respectively bonded to the battery positive substrate 1 and the battery negative substrate 5, and the positive particle material and the negative particle The materials are respectively covered on the battery positive substrate 1, the positive metal mesh 2, the battery negative substrate 5, and the negative metal mesh 4, and the above-mentioned barrier 3 is arranged between the battery positive substrate 1 and the battery negative substrate 5. The barrier 3 isolates the positive electrode substrate 1 of the battery and the negative electrode substrate 5 of the battery from each other, and the surface of this kind of battery is covered with a flexible insulating sealing layer.

Preferably, the positive electrode substrate 1 of the battery and the negative electrode substrate 5 of the battery are covered with an adhesive layer, and the positive metal mesh 2 and the negative metal mesh 4 are respectively bonded to the positive electrode substrate 1 of the battery and the negative electrode substrate of the battery. 5 on the adhesive layer.

Preferably, the adhesive layer is one or more mixed adhesive layers of polyethylene/polyethylene/polyimide/acrylic/rubber, and the thickness of the adhesive layer is 1 μm-5 μm.

Preferably, the material used for the positive electrode substrate 1 of the battery and the negative electrode substrate 5 of the battery is one of polyvinyl chloride plastics/polyethylene terephthalic plastics/polyethylene plastics/polypropylene plastics/polystyrene plastics or two kinds.

Preferably, the thickness of the battery positive electrode substrate 1 and the battery negative electrode substrate 5 is 3 μm-30 μm.

Preferably, the material of the positive electrode metal mesh 2 and the negative electrode metal mesh 4 is a composite metal mesh formed by electroplating one or two or three metals in aluminum mesh/copper mesh/nickel mesh, and its thickness is 5 μm-40 μm .

Preferably, the positive electrode particle material is one or more mixed materials in lithium cobalt oxide/lithium manganese oxide/nickel cobalt manganese ternary/lithium iron phosphate, and the negative electrode particle material is graphite/silicon powder/silicon-carbon One or more kinds of lithium titanate are mixed. The material coating thickness of the positive electrode granular material and the negative electrode granular material is 5 μm-40 μm.

Preferably, the barrier 3 is a diaphragm layer, the material of the diaphragm layer is one or more layers of PP/PE/non-woven fabric, and the surface is coated with one or more of PVDF/Al2O3/SiO2 materials, and the thickness of the diaphragm layer is 2 μm-10 μm.

Preferably, the barrier 3 is a solid electrolyte layer disposed between the battery positive electrode substrate and the battery negative electrode substrate, and the thickness of the solid electrolyte layer is 2 μm-10 μm.

Example 1:

The positive electrode particle material is LiCoO2, the negative electrode particle material is graphite, the battery positive electrode base material 1 and the battery negative electrode base material 5 are both made of polyethylene terephthalate (PET), the diaphragm is made of polypropylene PP film, and the positive electrode metal mesh 2 is made of aluminum mesh , the negative electrode metal mesh 4 is made of copper mesh, and the adhesive is made of rubber.

On the 10 μm battery positive electrode substrate 1 (PET), evenly coat 2 μm of viscous rubber, cut the 12 μm aluminum mesh into the shape of the positive electrode metal mesh in Figure 2, cover it on the battery positive electrode substrate 1, and grind LiCoO2 After sieving to particles below 20 μm, spray LiCoO2 particles evenly on the surface and gap of the aluminum mesh by spraying to obtain a positive electrode sheet. The final total thickness of the positive electrode sheet is between 58 μm and 65 μm;

Evenly coat 2 μm viscous rubber on the 10 μm battery negative base material 5 (PET), cut the 6 μm copper mesh into the shape of the negative metal mesh in Figure 2, cover it on the battery negative base material 5, and grind the graphite After sieving to particles below 10 μm, use the spray method to evenly spray graphite particles on the surface and gap of the copper mesh to obtain the negative electrode sheet. The final total thickness of the negative electrode sheet is between 30 μm and 36 μm;

Cover the negative electrode sheet with a cut PP separator, the thickness of the separator is 16 μm, drop about 0.1 g of electrolyte on the surface of the separator in the glove box, close the positive electrode sheet, and press it to obtain the battery.

Example 2

The positive electrode particle material and the negative electrode particle material are all made of graphene, the battery positive electrode base material 1 and the battery negative electrode base material 5 are both made of polypropylene plastic (PP), the separator is made of polyethylene PE film, the positive electrode metal mesh 2 is made of nickel mesh, and the negative electrode metal mesh 4 Nickel mesh is used, and acrylic glue is used as the adhesive.

Evenly coat 2 μm viscous acrylic glue on two pieces of 8 μm insulating substrate PP, cut the 10 μm nickel mesh into the shape of the metal mesh in Figure 2, cover it on the insulating substrate, grind and sieve the graphene into After the particles are below 15 μm, use the sputtering method to evenly spray graphene particles on the surface and gap of the nickel mesh to obtain the pole piece. The final total thickness of the pole piece is between 42 μm and 46 μm;

Cover the two pole pieces with a cut PE diaphragm, the thickness of the diaphragm is 12 μm, drop about 0.1g of electrolyte on the surface of the diaphragm in the glove box, close the two pole pieces, and press them together to obtain a battery.

The present invention also provides a method for preparing an ultra-thin battery, comprising the following steps:

(1) First prepare the positive electrode sheet of the battery: apply an adhesive layer on the positive electrode substrate 1 of the plastic battery, cover the positive electrode metal mesh 2, and then grind the positive electrode material into powder to make the positive electrode granular material, and then spray it on the positive electrode In the surface and gap of the metal mesh 2, a positive current collector is made;

(2) Next, prepare the negative electrode sheet of the battery: apply an adhesive layer on the negative electrode substrate 5 of the plastic battery, cover the negative electrode metal mesh 4, and then grind the negative electrode material into powder to make negative electrode granular materials, and then spray it on the negative electrode In the surface and gap of the metal mesh 4, a negative electrode current collector is made;

(3) Cover the prepared negative electrode sheet with a separator or a solid electrolyte layer, then drop an appropriate amount of electrolyte solution, close the positive electrode sheet, and press to obtain an ultra-thin battery.

The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the described embodiments, those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present invention , these equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (10)

1. a new type superthin battery, it is characterized in that: comprise anode base material, battery cathode base material, cathode metal net, negative metal net, positive electrode particle material, negative pole granular materials, barriers, the anode ear of battery, negative electrode lug is respectively by cathode metal net, the extension of negative metal net forms, described cathode metal net, negative metal net is bonded in anode base material respectively, on battery cathode base material, described positive electrode particle material and negative pole granular materials cover anode base material respectively, cathode metal net and battery cathode base material, negative metal is online, described anode base material, above-mentioned barriers is provided with and anode base material and battery cathode base material intercept by described barriers mutually between battery cathode base material, this kind of battery appearance is coated with flexible insulation sealant.

2. a kind of new type superthin battery according to claim 1, it is characterized in that: described anode base material, battery cathode base material are coated with bonding glue-line, described cathode metal net, negative metal net are bonded on the bonding glue-line of anode base material, battery cathode base material respectively.

3. a kind of new type superthin battery according to claim 2, is characterized in that: described bonding glue-line is one or more mixing adhesive linkages in polyethylene/polyethylene/polyimide/acrylonitrile acid/rubber, and the thickness of described bonding glue-line is 1 μm-5 μm.

4. a kind of new type superthin battery according to claim 1, is characterized in that: described anode base material, battery cathode base material material used is one or both in igelite/poly terephthalic acid class plastics/vinyon/polypropylene plastics/polystyrene plastics.

5. a kind of new type superthin battery according to claim 4, is characterized in that: the thickness of described anode base material, battery cathode base material is 3 μm-30 μm.

6. a kind of new type superthin battery according to claim 1, it is characterized in that: the material of described cathode metal net and negative metal net is the composite metal net that in aluminium net/copper mesh/nickel screen, one or both or three kinds of metals are electroplated mutually, and its thickness is 5 μm-40 μm.

7. a kind of new type superthin battery according to claim 1, it is characterized in that: described positive electrode particle material is one or more composite materials in cobalt acid lithium/LiMn2O4/nickel-cobalt-manganese ternary/LiFePO4, described negative pole granular materials is one or more mixing described positive electrode particle materials of mixing of graphite/silica flour/silico-carbo/lithium titanate and the material coating thickness of negative pole granular materials is 5 μm-40 μm.

8. a kind of new type superthin battery according to claim 1, it is characterized in that: described barriers is a membrane layer, the material of described membrane layer is one or more layers of PP/PE/ nonwoven fabrics, and surface-coated has one or more materials of PVDF/Al2O3/Si O2, the thickness of membrane layer is 2 μm-10 μm.

9. a kind of new type superthin battery according to claim 1, is characterized in that: described barriers is a solid state electrolysis liquid layer being arranged between anode base material and battery cathode base material, and the thickness of described solid state electrolysis liquid layer is 2 μm-10 μm.

10. a preparation method for slimline battery, is characterized in that: comprise the following steps:

(1) first battery anode slice is prepared: be coated with on plastic battery positive-pole base material and be covered with bonded adhesives layer, cathode metal net in covering, after again positive electrode grind into powder being made positive electrode particle material, splash, in the surface and gap of cathode metal net, makes plus plate current-collecting body;

(2) secondly battery cathode sheet is prepared: be coated with on plastic battery base material of cathode and be covered with bonded adhesives layer, negative metal net in covering, after again negative material grind into powder being made negative pole granular materials, splash, in the surface and gap of negative metal net, makes negative current collector;

(3) will the negative plate prepared be covered with barrier film or solid state electrolysis liquid layer, then drip appropriate electrolyte, close positive plate, obtains slimline battery after pressing.