CN210006846U

CN210006846U - lithium battery suitable for round battery cabin

Info

Publication number: CN210006846U
Application number: CN201920592722.9U
Authority: CN
Inventors: 杨维元
Original assignee: Huizhou Searle Amperex Technology Ltd
Current assignee: Feng Leihua
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-01-31
Anticipated expiration: 2029-04-28

Abstract

The utility model relates to an lithium cells suitable for round battery compartment, the lithium cell is the cake type, the lithium cell lateral wall outside is encircleed there is the kink, the kink with wherein terminal surface body coupling of lithium cell, the anodal utmost point ear of lithium cell, negative pole utmost point ear are passed through by the lithium cell is inside the kink is drawn forth the lithium cell and the round battery compartment phase-match that removes portable electronic product, the packing into in the round battery compartment of the same diameter the utility model provides a cake type lithium cell is compared in packing into current square lithium cell, and battery capacity can improve at least 25%.

Description

lithium battery suitable for round battery cabin

Technical Field

The invention relates to the field of electrochemistry, in particular to lithium ion batteries and a manufacturing method thereof.

Background

The lithium ion battery is used as energy forms in a chemical power supply, has the advantages of high working voltage, high energy density, light weight, small volume, good safety, long cycle life, environmental protection and the like, and has broad application prospect in the aspects of mobile electronic appliances, electric tools and the like.

The reason that the battery compartment of the mobile portable electronic product is generally manufactured into a round type is that in the batch production and manufacturing process, the round type structure is simpler in processing process, lower in cost and the best in yield compared with other structures, so that in order to improve the cruising ability of the mobile portable electronic product, the development of lithium batteries with excellent performance and suitable for the round type battery compartment is of great significance.

Disclosure of Invention

The invention aims to provide lithium batteries suitable for circular battery bins, wherein the lithium batteries are of a round cake shape and are matched with the circular battery bins of mobile portable electronic products, and compared with the prior square lithium batteries, the round cake lithium batteries filled in the circular battery bins with the same diameter can improve the battery capacity by at least 25 percent.

lithium cell, lithium cell are the cake form, and the lithium cell lateral wall outside is around there being the kink, and the kink and the wherein terminal surface body coupling of lithium cell, the anodal utmost point ear of lithium cell, negative pole utmost point ear are drawn forth through the kink by lithium cell inside for the tie point of the positive negative pole that matches the circular battery storehouse and set up, the contained angle between the anodal utmost point ear of lithium cell and the negative pole utmost point ear can become arbitrary angle.

, the battery core of the lithium battery is a winding structure, and the assembly mode of the diaphragm and the pole piece during winding can adopt a diaphragm bag-making coating positive pole piece and then winding the positive pole piece with the negative pole, and can also adopt a roll-to-roll double-layer diaphragm and positive and negative pole piece winding mode.

, the lithium battery package case is made of aluminum or aluminum alloy.

, the electrolyte used in the lithium battery can be gel polymer solid electrolyte or conventional liquid electrolyte.

The invention discloses methods for manufacturing the round cake-shaped lithium battery, which specifically comprise the following steps:

, preparing anode slurry according to a conventional method, wherein the current collector of the anode plate is a rectangular aluminum foil, coating the anode slurry on the two end faces of the aluminum foil of the current collector of the anode plate along the width direction, leaking 1-5mm of aluminum foil on the two end faces of the tail end of the anode plate for connecting an anode tab, and drying and rolling a film to obtain the anode plate;

preparing negative electrode slurry according to a conventional method, then performing gap coating on the current collector copper foil of the negative electrode plate along the width direction, drying, rolling, cutting and cutting to obtain a negative electrode plate with the current collector copper foil leaking 1-4mm from the end of the height direction of the electrode plate, preferably, the leaked current collector copper foil is arranged at the tail part of the negative electrode plate and is used for connecting a negative electrode tab;

respectively connecting the leaking parts of the positive plate and the negative plate with a positive electrode lug and a negative electrode lug, and then pasting gummed paper on two end faces of the leaking parts of the positive plate and the negative plate;

insulating the positive plate, placing the positive plate between two layers of diaphragms, sealing the edges of the two layers of diaphragms to sleeve the parts of the positive plate except the tail end, wherein a gap of 1-5mm is formed between the head of the positive plate and the end of the sealed diaphragm, and the gap is used for preventing the positive plate from expanding to puncture the diaphragm when the lithium battery is charged and discharged circularly;

and step five, winding, namely laminating the positive plate and the negative plate after the insulation treatment, separating and insulating the positive plate and the negative plate by using a diaphragm, starting to wind from the head end of the positive plate to obtain a cylindrical winding core, and ending by adopting a tab. When winding, the positive plate is wound at the outermost layer around the negative plate on the inner layer, and adhesive tapes for fixing are arranged at the tail parts of the positive plate and the negative plate on the outer layer of the cylindrical winding core. The winding can also be carried out by adopting the double-negative-pole piece to clamp the positive-pole piece;

step six, packaging, namely, packaging a lithium battery package shell by adopting a sheet of aluminum or aluminum alloy, wherein the sheet is provided with a circular groove, a cylindrical roll core is placed into the groove, an anode tab and a cathode tab in the vertical direction are bent by 90 degrees, the sheet is folded and pressed to seal the groove, the pressing can adopt a conventional technical means applied to a soft package lithium battery, top sealing and side sealing are sequentially carried out, gummed paper is pasted on two end faces of a part, between two layers of sheets, of the anode tab and the cathode tab, and flaring, liquid injection, formation and secondary sealing are sequentially carried out by adopting the conventional technical means;

and step seven, forming the lithium battery, namely punching the folded connecting surface of the sheet into a circular surface by adopting a punching mode, wherein the circular surface and the groove are concentric circles, the diameter of the circular surface is larger than that of the groove, the part of the circular surface, which is larger than the groove, is bent towards the direction of the groove to form a bent part, and the leaked positive electrode lug and the leaked negative electrode lug are bent towards the direction far away from the groove.

And step eight, charging and discharging the battery according to a conventional method to activate the battery to obtain a round cake type lithium battery product.

Preferably, in the sixth step, the lithium battery packaging shell adopts an aluminum-plastic film, and the thickness of the aluminum-plastic film is 70-90 microns.

Drawings

The figures illustrate the present invention further , but the embodiments in the figures are not meant to be limiting in any way.

Fig. 1 is a schematic structural diagram of a lithium battery of a disk type provided in embodiment 1 of of the present invention.

Fig. 2 is a schematic structural diagram of a positive electrode sheet of a lithium battery provided in embodiment 1 of of the present invention.

Fig. 3 is a schematic diagram of a package of a lithium battery provided in embodiment 1 of of the present invention.

Fig. 4 is a schematic structural diagram of punching and forming of a lithium battery provided in embodiment 1 of of the present invention.

Fig. 5 is a schematic structural diagram of a lithium battery of a disk type according to embodiment 2 of of the present invention.

Fig. 6 is a schematic structural diagram of a lithium battery of a disk type according to embodiment 3 of of the present invention.

Wherein the reference numerals are: 1. a lithium battery; 10. a bending section; 2. a positive electrode tab; 3. a negative electrode tab; 4. insulating gummed paper; 5. a positive plate; 6. a diaphragm; 7. an aluminum-plastic film; 8. a groove; 9. high-temperature insulating gummed paper.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

Example 1

As shown in FIG. 1, kinds of lithium batteries 1, lithium battery 1 are the cake form, lithium battery 1 lateral wall outside is around having kink 10, kink 10 and terminal surface body coupling wherein of lithium battery 1, and anodal utmost point ear 2, the negative pole utmost point ear 3 of lithium battery 1 are drawn forth through kink 10 by lithium battery 1 is inside, anodal utmost point ear 2 and negative pole utmost point ear 3 are drawn forth in parallel.

The method for producing a cake-shaped lithium battery provided in production example 1 specifically includes the steps of:

step , preparing anode slurry, coating the anode slurry on the two end faces of the aluminum foil of the anode plate 5 along the width direction by adopting a rectangular aluminum foil as a current collector of the anode plate 5, leaking 3mm of aluminum foil on the two end faces of the tail end of the anode plate 5 for connecting an anode tab 3, drying and rolling to obtain the anode plate 5;

preparing negative electrode slurry, then performing gap type coating on a current collector copper foil of a negative electrode plate along the width direction, drying, rolling a film, cutting and cutting to obtain a negative electrode plate, and arranging a current collector copper foil with the leakage length of 3mm at the tail part of the negative electrode plate for connecting a negative electrode tab 3;

respectively connecting the leaking parts of the positive plate 5 and the negative plate with a positive electrode tab 2 and a negative electrode tab 3, and then sticking high-temperature insulating gummed paper 9 to the two end faces of the leaking parts of the positive plate 5 and the negative plate;

step four, as shown in fig. 2, insulating the positive plate 5, placing the positive plate 5 between two layers of diaphragms 6, sealing the edges of the two layers of diaphragms 6 to sleeve the parts of the positive plate 5 except the tail ends, and arranging a gap of 3mm between the head of the positive plate 5 and the end of the sealed diaphragm 6;

and step five, winding, namely laminating the positive plate 5 and the negative plate after the insulation treatment, separating and insulating the positive plate and the negative plate by using a diaphragm 6, starting to wind from the head end of the positive plate 5 to obtain a cylindrical winding core, and ending by adopting a tab. When winding, the positive electrode sheet 5 is wound around the negative electrode sheet of the inner layer at the outermost layer;

sixthly, as shown in fig. 3, packaging is carried out, the lithium battery packaging shell adopts an aluminum-plastic film 7, a circular groove 8 is formed in the aluminum-plastic film 7, a cylindrical roll core is placed in the groove 8, the positive electrode tab 2 and the negative electrode tab 3 which are in the vertical direction are bent by 90 degrees, the aluminum-plastic film 7 is folded in half and is subjected to hot pressing to seal the groove 8, insulating gummed paper 4 is pasted on the two end faces of the part, between the two layers of the aluminum-plastic films 7, of the positive electrode tab 2 and the negative electrode tab 3, and flaring, liquid injection, formation and secondary sealing are sequentially carried out;

seventhly, as shown in fig. 4, forming by punching, punching the folded connecting surface of the aluminum-plastic film 7 into a circular surface, wherein the circular surface and the groove 8 are concentric circles, the diameter of the circular surface is larger than that of the groove 8, bending the part of the circular surface larger than the groove 8 towards the groove 8 to form a bent part 10, and bending the leaked positive electrode tab 2 and negative electrode tab 3 away from the groove to obtain the lithium battery 1 shown in fig. 1.

And step eight, performing charge and discharge activation on the lithium battery 1 according to a conventional method.

Compared with the existing square battery, the round cake lithium battery 1 provided in this embodiment 1 has the following capacity comparison table under the condition that the diameter of the round battery compartment is not changed:

example 2

As shown in FIG. 5, kinds of lithium batteries 1, lithium battery 1 is the cake form, lithium battery 1 lateral wall outside around have a kink 10, kink 10 and terminal surface body coupling wherein of lithium battery 1, the anodal utmost point ear 2 of lithium battery 1, negative pole utmost point ear 3 draw out through kink 10 from lithium battery 1 inside, anodal utmost point ear 2 and negative pole utmost point ear 3 form 180 and draw out.

Example 3

As shown in FIG. 6, kinds of lithium batteries 1, lithium battery 1 is the cake form, lithium battery 1 lateral wall outside around have a kink 10, kink 10 and terminal surface body coupling wherein of lithium battery 1, the anodal utmost point ear 2 of lithium battery 1, negative pole utmost point ear 3 draw out through kink 10 from lithium battery 1 inside, anodal utmost point ear 2 and negative pole utmost point ear 3 form 90 and draw out.

Claims

The lithium battery is characterized in that the lithium battery is in a round cake shape, a bent part is arranged on the outer side of the side wall of the lithium battery in a surrounding mode, the bent part is connected with a end face body of the lithium battery, and a positive pole lug and a negative pole lug of the lithium battery are led out from the inside of the lithium battery through the bent part.
2. The lithium battery of claim 1, wherein the cells of the lithium battery are in a coiled configuration.
3. The lithium battery as claimed in claim 2, wherein the package casing is made of aluminum or aluminum alloy.