CN211789320U - Soft-package button type lithium ion battery - Google Patents

Abstract

The utility model relates to a soft-package button type lithium ion battery, which comprises a soft shell, an electric core and an insulating rod, wherein the electric core and the insulating rod are accommodated in the soft shell; the battery cell comprises a central through hole; the device is in a spiral winding form and comprises a plurality of layers of anodes and a plurality of layers of cathodes which are alternately arranged; at least two layers of anodes in the multiple layers of anodes are provided with anode lugs; at least two layers of the multi-layer cathodes are provided with cathode ears; the positive electrode lug and the negative electrode lug are respectively positioned at two ends of the battery cell; the positive electrode lugs on the at least two layers of positive electrodes and the negative electrode lugs on the at least two layers of negative electrodes both comprise a first state and a second state; in the first state, the battery cell is arranged on one side of the central through hole in parallel, protrudes out of the end face of the battery cell and forms a set included angle with the end face of the battery cell; in the second state, the two are pressed downwards towards the central through hole under the action of external force to form a laminated structure for reducing internal resistance, and the output conductors are connected at the joints of the laminated structure and fixed in a heat sealing mode so as to lead out the electrodes. The battery has small internal resistance, good quick charging performance and high product yield.

Description

Soft-package button type lithium ion battery

Technical Field

The utility model relates to a lithium ion battery, more specifically say, relate to a soft packet of knot formula lithium ion battery.

Background

Soft-package button lithium ion battery application area is more extensive, along with the rise of wireless bluetooth headset, steel-clad button lithium ion battery increases the range very fast, the situation that the confession is short of asking appears, traditional soft-package button lithium ion battery welds the utmost point ear in the empty foil district of pole piece usually, paste insulating adhesive paper simultaneously, then the required pole piece of coiling process is cut into to the section, convolute positive pole, negative pole and diaphragm three together again on coiling equipment, because button cell pole piece width is very narrow, concentrate on 3-6mm, therefore, the regional cracked condition of foil material appears very easily, lead to battery appearance height internal resistance etc. bad, in case the pole piece fracture simultaneously, whole battery will scrap, lead to the defective rate high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a soft packet of knot formula lithium ion battery of modified.

The utility model provides a technical scheme that its technical problem adopted is: constructing a soft-package button type lithium ion battery, which comprises a soft shell, a battery cell accommodated in the soft shell, and an insulating rod which is arranged in the battery cell in a penetrating way and has the length larger than the height of the battery cell;

the battery cell comprises a central through hole for the insulating rod to penetrate through; the battery cell is in a spiral winding form and comprises a plurality of layers of anodes and a plurality of layers of cathodes which are alternately arranged; at least two layers of anodes in the multilayer anodes are provided with anode lugs; at least two layers of the multi-layer negative electrodes are provided with negative electrode lugs; the positive electrode lug and the negative electrode lug are respectively positioned at two ends of the battery cell;

the positive electrode lugs on the at least two layers of positive electrodes and the negative electrode lugs on the at least two layers of negative electrodes respectively comprise a first state and a second state;

in the first state, the anode lugs on at least two layers of anodes are arranged on one side of the central through hole side by side and protrude out of the end surface of the battery cell to form a set included angle with the end surface of the battery cell; the cathode lugs on at least two layers of cathodes are arranged on one side of the central through hole in parallel and protrude out of the end surface of the battery cell to form a set included angle with the end surface of the battery cell;

and in the second state, the positive lugs on the at least two layers of positive electrodes and the negative lugs on the at least two layers of negative electrodes are pressed downwards towards the central through hole under the action of external force to form a laminated structure for reducing internal resistance, and an output conductor which can penetrate through the soft shell and is provided with lug glue is connected at the joint of the laminated structure and is fixed in a heat sealing mode, so that the electrodes are led out.

Preferably, the battery cell is columnar, and the lengths of the positive electrode tab and the negative electrode tab are both larger than the radius of the battery cell and smaller than the diameter of the battery cell.

Preferably, the battery cell comprises a first diaphragm, a positive plate, a second diaphragm and a negative plate which are sequentially stacked;

the number of the positive lugs is multiple, and the positive lugs are arranged on the positive plate at equal intervals;

the negative pole ear is a plurality of, and a plurality of negative pole ear equidistance sets up on the negative pole piece.

Preferably, the first separator, the positive plate, the second separator and the negative plate are thermally bonded to form a composite plate;

the battery core is formed by winding the composite sheet.

Preferably, a first empty foil area is arranged on the long edge of one side, close to the positive plate, of the positive plate;

the plurality of positive lugs are arranged in the first empty foil area side by side at intervals;

a second empty foil area is arranged on the long edge of one side, close to the negative plate, of the negative plate;

the negative electrode tabs are arranged in the second empty foil area side by side at intervals.

Preferably, the set included angle is 0-90 degrees.

Preferably, the positive tab and the negative tab are in a longitudinal sheet shape, and the width of the positive tab and/or the negative tab is 3-6 mm.

Preferably, each layer of the positive electrode is arranged corresponding to one positive electrode tab.

Preferably, each layer of the negative electrode is arranged corresponding to one negative electrode tab.

Preferably, the soft shell is an aluminum plastic film.

Implement the utility model discloses a soft packet of knot formula lithium ion battery has following beneficial effect: the soft-package button type lithium ion battery is characterized in that positive lugs are arranged on at least two layers of positive poles in a multilayer positive pole of a battery core in a soft shell, negative lugs are arranged on at least two layers of negative poles in a multilayer negative pole, and the positive lugs and the negative lugs are divided into two ends positioned at the battery core, when the soft-package button type lithium ion battery is assembled, the positive lugs and the negative lugs which are arranged in a first state and protrude out of the end surface of the battery core at a set included angle with the end surface of the battery core can be pressed downwards to form a laminated structure capable of reducing internal resistance through the action of external force, an output conductor with lug glue can be arranged on the soft shell through connection at the joint of the laminated structure, the output conductor is fixed through a heat sealing mode so as to lead out electrodes, the positive lugs are arranged on at least two layers of positive poles, the negative lugs are arranged on at least two layers of negative poles, the scrapp, the internal resistance of the battery can be greatly reduced, and the quick charging characteristic of the battery can be improved. The soft-package button type lithium ion battery has the advantages of simple structure, small internal resistance, good quick charging performance and high product yield.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic diagram of a partial structure of a soft-packed button lithium ion battery according to some embodiments of the present invention;

fig. 2 is a schematic structural diagram of a cell of the soft-package button type lithium ion battery shown in fig. 1.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 and 2 show some preferred embodiments of the soft-packaged button lithium ion battery of the present invention. This soft packet of knot formula lithium ion battery can be widely applied to various fields such as 3C digit, intelligence are dressed, electric automobile, medical treatment, military affairs, and it can avoid leading to the battery to scrap after single utmost point ear fracture, and it can make the battery internal resistance reduce by a wide margin, thereby promotes the fast characteristic of filling of battery, thereby promotes the product yield. The soft-package button type lithium ion battery has the advantages of simple structure, small internal resistance, good quick charging performance and high product yield.

Further, as shown in fig. 1 and 2, in some embodiments, the soft-packaged button-type lithium ion battery may include a soft case 10, a cell 20, and an insulating rod 30. Further, in some embodiments, the soft casing 10 can be used to house the battery cell 20 and the insulating rod 30. The battery cell 20 may be disposed in the soft casing 10, and may generate electric energy through an electrochemical reaction. The insulating rod 20 may be inserted into the cell 20, and may be used to adsorb and store the electrolyte injected into the winding core 10.

Further, in some embodiments, the soft casing 10 may be a thin film, and in particular, in some embodiments, the soft casing 10 may be an aluminum plastic film, and the battery cell 20 may be protected by the good oxygen barrier, moisture resistance, puncture resistance, high strength, high toughness, one-way or two-way ventilation, ultraviolet resistance, and chemical resistance of the aluminum plastic film. It is understood that in other embodiments, the soft shell 10 may not be limited to aluminum plastic film. In some embodiments, the soft casing 10 may be a column shape, and it may wrap the periphery of the battery cell 20.

Further, in some embodiments, the battery cell 20 may have a cylindrical shape, and may include a central through hole 21, where the central through hole 21 may be used for an insulating rod to pass through. The cell 20 may be in the form of a spiral winding, which may include a plurality of layers of positive electrodes and a plurality of layers of negative electrodes alternately disposed, and a separator disposed between the adjacently disposed positive electrodes and negative electrodes. Further, specifically, the battery cell 20 may include a first separator, a positive electrode sheet, a second separator, and a negative electrode sheet, which are sequentially stacked. The composite sheet is formed by winding the composite sheet formed by hot lamination of the first diaphragm, the positive plate, the second diaphragm and the negative plate which are sequentially stacked. The winding of the positive electrode sheet can form a multi-layer positive electrode, the winding of the negative electrode sheet can form a multi-layer negative electrode, and the winding of the second separator can form a multi-layer separation layer.

The positive plate can comprise a positive substrate and a positive material coated on the positive substrate. The anode substrate can be a current collector made of aluminum foil and can be in a strip shape. In some embodiments, the positive electrode tab is provided with a first empty foil zone near one long side thereof. The anode material can be uniformly coated on the anode substrate and is positioned outside the first empty foil area.

The negative electrode sheet may include a negative electrode substrate and a negative electrode material coated on the negative electrode substrate. The negative electrode substrate can be a current collector made of copper foil, and can also be in a strip shape. The long edge of the negative plate close to one side of the negative plate is provided with a second empty foil area, and the negative material can be uniformly coated on the negative substrate and is positioned outside the second empty foil area.

The first diaphragm can be arranged on one side of the positive plate and is positioned on the uppermost layer of the composite sheet. One side of the first membrane is coated with a hot melt material. The hot melt material may be coated on a side of the first separator disposed opposite to the positive electrode tab. The hot melt material can be hot melt adhesive which can be melted under a heating state to rapidly bond the first diaphragm and the positive plate.

The second diaphragm can be arranged between the positive plate and the negative plate, hot melt materials are coated on two sides of the second diaphragm, the hot melt materials can be melted under a heating state, and the second diaphragm is rapidly bonded with the positive plate and the negative plate respectively.

In some embodiments, the battery core 10 is wound by using the composite sheet, so that the winding efficiency can be improved, the first diaphragm, the positive plate, the second diaphragm and the negative plate are prevented from being dislocated, meanwhile, the influence of dust and water vapor can be avoided due to the contact of hands, and the quality of the lithium battery can be improved to the maximum extent. In addition, the composite sheet is formed by hot compressing, so that a die cutting process can be omitted, burrs can be reduced, and the risk of low-voltage fracture of the battery is avoided.

Further, in some embodiments, at least two of the multiple layers of positive electrodes are provided with positive tabs 22. Specifically, in some embodiments, the positive tab 22 may be multiple, the multiple positive tabs 22 may be disposed corresponding to the multiple layers of positive electrodes, and each layer of positive electrodes may be disposed corresponding to one layer of positive tab. Specifically, in some embodiments, the plurality of positive electrode tabs 22 may be disposed on the positive electrode sheet at equal intervals, and the center distance between two adjacent positive electrode tabs 22 may be adapted to the circumference of the battery cell, so that after the positive electrode sheet is wound, the plurality of positive electrode tabs 22 may all be located on the same side of the central through hole 21. In some embodiments, specifically, the plurality of positive tabs 22 can be positioned side-by-side and spaced apart in the first empty foil zone by ultrasonic welding or laser welding prior to heat bonding of the positive plates.

Further, in some embodiments, the positive tab 22 may be an elongated sheet, which may be an aluminum metal strip, which may have a width of 3-6 mm. It is understood that in other embodiments, the width of the positive tab 22 may not be limited to 3-6 mm. In some embodiments, the length of the positive tab 22 is greater than the radius of the battery cell 20 and less than the diameter of the battery cell 20, so as to extend along the radial direction of the battery cell 20, cover the central through hole 21, and avoid protruding the outer periphery of the battery cell 20, thereby preventing the positive tab from being unable to be installed in the soft casing 10. In some embodiments, the plurality of positive ears 22 may be equally long. Of course, it will be appreciated that in other embodiments, the length decreases slightly towards the central through hole.

Further, in some embodiments, the positive tab 22 can include a first state and a second state. The first state is a pre-assembly state. The second state is an assembled state. When the positive tab 22 is in the first state, the positive tabs 22 on the at least two layers of positive electrodes may be disposed side by side on one side of the central through hole 21 and protrude out of the end surface of the battery cell 20 to form a set included angle with the end surface of the battery cell 20. Specifically, the positive tab 22 may be disposed perpendicular to the end surface of the battery cell 20, and the set included angle may be 90 °. Of course, it is understood that in other embodiments, the angle may not be limited to a right angle, and may be an acute angle, and the angle set by the included angle may be 0 to 90 °. When the positive tab 22 is in the second state, it can be pressed down toward the central through hole 21 under the action of external force, the positive tabs 22 on the at least two layers of positive electrodes can be stacked to form a laminated structure and can be abutted against the end of the insulating rod 30, an output conductor with tab glue is connected at the joint of the laminated structure and penetrates out of the soft shell 10 and is fixed in a heat-sealing manner so as to lead out an electrode, specifically, the output conductor with tab glue can be fixed at the joint of the laminated structure by welding, the single positive tab can be prevented from being scrapped after being broken by arranging a plurality of positive tabs 22, and a parallel circuit structure can be formed, namely, several batteries can be connected in parallel, so that the internal resistance of the batteries can be reduced, the quick charging characteristic of the batteries can be improved, and the product yield can be improved.

Further, in some embodiments, negative electrode tabs 23 are provided on at least two of the multiple layers of negative electrodes. The positive tab 22 and the negative tab 23 may be respectively located at two ends of the battery cell 20. Specifically, in some embodiments, the negative electrode tab 23 may be a plurality of negative electrode tabs 23, the plurality of negative electrode tabs 23 may be disposed corresponding to the plurality of layers of negative electrodes, and each layer of negative electrodes may be disposed corresponding to one layer of negative electrode tabs. Specifically, in some embodiments, the plurality of negative electrode tabs 23 may be disposed on the negative electrode sheet at equal intervals, and the center distance between two adjacent negative electrode tabs 23 may be adapted to the circumference of the battery cell, so that after the negative electrode sheet is wound, the plurality of negative electrode tabs 23 may all be located on the same side of the central through hole 21. In some embodiments, specifically, the plurality of negative electrode tabs 23 may be disposed side by side and spaced apart at the first empty foil region by ultrasonic welding or laser welding before the negative electrode tab is thermally bonded.

Further, in some embodiments, the negative tab 23 may be an elongated sheet, which may be a copper metal strip, whose width may be 3-6 mm. It is understood that the width of the negative electrode tab 23 may not be limited to 3-6mm in other embodiments. In some embodiments, the length of the negative tab 23 is greater than the radius of the battery cell 20 and less than the diameter of the battery cell 20, so as to extend along the radial direction of the battery cell 20, cover the central through hole 21, and avoid protruding the outer periphery of the battery cell 20 to cause the battery cell to be unable to be installed in the soft casing 10. In some embodiments, the plurality of negative electrode tabs 22 may be arranged at equal lengths. Of course, it will be appreciated that in other embodiments, the length decreases slightly towards the central through hole.

Further, in some embodiments, the negative tab 23 can include a first state and a second state. The first state is a pre-assembly state. The second state is an assembled state. When the negative electrode tab 23 is in the first state, the negative electrode tabs 23 on the at least two layers of negative electrodes may be disposed side by side on one side of the central through hole 21 and protrude out of the end surface of the battery cell 20 to form a set included angle with the end surface of the battery cell 20. Specifically, the negative electrode tab 23 may be disposed perpendicular to the end surface of the battery cell 20, and the set included angle may be 90 °. Of course, it is understood that in other embodiments, the angle may not be limited to a right angle, and may be an acute angle, and the angle set by the included angle may be 0 to 90 °. When the negative electrode tab 23 is in the second state, it can be pressed downward toward the central through hole 21 under the action of external force, the negative electrode tabs 23 on the at least two layers of negative electrodes can be stacked to form a laminated structure and can be abutted against the end of the insulating rod 30, an output conductor with tab glue is connected at the joint of the laminated structure and penetrates out of the soft shell 10 and is fixed in a heat sealing manner so as to lead out an electrode, specifically, the output conductor with tab glue can be fixed at the joint of the laminated structure by welding, and the arrangement of the plurality of negative electrode tabs 23 can prevent the whole battery from being scrapped after the single negative electrode tab is broken. And, positive tab 22, negative pole tab 23 are all set up side by side, and are located this central through-hole 21 double-phase contralateral side respectively, and positive tab 22 and negative pole tab 23 on the positive pole that sets up adjacently can form a set of electrode with the negative pole tab to form the parallelly connected circuit structure of multiunit, can be equivalent to several batteries and connect in parallel, and then can reduce electric core internal resistance, promote the quick charge characteristic of battery, promote the product yield.

Further, in some embodiments, the insulating rod 30 may be inserted into the central through hole 21, and the length thereof may be greater than the height of the battery cell 20, and both ends thereof may penetrate through the central through hole 21, so as to support the positive tab 22 and the negative tab 23 in the second state, so that the positive tab 22 is isolated from the positive electrode, and the negative tab 23 is isolated from the negative electrode, thereby avoiding short circuit, and improving the yield of products. Further, in some embodiments, the shape and size of the insulating rod 30 may be comparable to the shape and size of the central through hole 11. The insulating rod 30 may be cylindrical, and its outer diameter may be slightly smaller than the inner diameter of the central through hole 11. Of course, it is understood that in other embodiments, the outer diameter of the insulating rod 20 may be equal to the inner diameter of the central through hole 11, and thus may closely fit the inner sidewall of the central through hole 11. In some embodiments, the insulating rod 30 may be made of an insulating material, and particularly, it may be made of PP or PET.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. The soft-package button type lithium ion battery is characterized by comprising a soft shell (10), a battery cell (20) accommodated in the soft shell (10), and an insulating rod (30) which is arranged in the battery cell (20) in a penetrating manner and has a length greater than the height of the battery cell (20);

the battery core (20) comprises a central through hole (21) for the insulating rod to penetrate through; the battery core (20) is in a spiral winding form and comprises a plurality of layers of anodes and a plurality of layers of cathodes which are alternately arranged; at least two layers of anodes in the multilayer anodes are provided with anode lugs (22); at least two layers of the multi-layer negative electrodes are provided with negative electrode ears (23); the positive electrode lug (22) and the negative electrode lug (23) are respectively positioned at two ends of the battery cell (20);

the positive electrode tabs (22) on the at least two layers of positive electrodes and the negative electrode tabs (23) on the at least two layers of negative electrodes both comprise a first state and a second state;

in the first state, the positive lugs (22) on at least two layers of positive electrodes are arranged on one side of the central through hole (21) side by side and protrude out of the end surface of the battery cell (20) to form a set included angle with the end surface of the battery cell (20); the negative electrode lugs (23) on at least two layers of negative electrodes are arranged on one side of the central through hole (21) side by side and protrude out of the end face of the battery cell (20) to form a set included angle with the end face of the battery cell (20);

and in the second state, the positive lugs (22) on the at least two layers of positive electrodes and the negative lugs (23) on the at least two layers of negative electrodes are pressed downwards towards the central through hole (21) under the action of external force to form a laminated structure for reducing internal resistance, and an output conductor which can penetrate through the soft shell (10) and is provided with lug glue is connected at the joint of the laminated structure and fixed in a heat sealing mode, so that the electrodes are led out.

2. The soft-packaging button type lithium ion battery according to claim 1, wherein the battery core (20) is cylindrical, and the length of the positive tab (22) and the length of the negative tab (23) are both larger than the radius of the battery core (20) and smaller than the diameter of the battery core (20).

3. The soft-package button type lithium ion battery according to claim 1, wherein the battery cell (20) comprises a first diaphragm, a positive plate, a second diaphragm and a negative plate which are sequentially stacked;

the number of the positive lugs (22) is multiple, and the positive lugs (22) are arranged on the positive plate at equal intervals;

the negative electrode tabs (23) are multiple, and the negative electrode tabs (23) are arranged on the negative electrode sheet at equal intervals.

4. The soft-packing button type lithium ion battery according to claim 3, wherein the first separator, the positive plate, the second separator and the negative plate are thermally compressed to form a composite sheet;

the battery core (20) is formed by winding the composite sheet.

5. The soft-packaging button type lithium ion battery according to claim 3, wherein the long side of the positive plate near one side thereof is provided with a first empty foil area;

the positive lugs (22) are arranged in the first empty foil area side by side at intervals;

a second empty foil area is arranged on the long edge of one side, close to the negative plate, of the negative plate;

the negative electrode tabs (23) are arranged in the second empty foil area side by side at intervals.

6. The soft-packing button type lithium ion battery according to claim 1, wherein the set included angle is 0-90 degrees.

7. The soft-packaging button type lithium ion battery according to claim 1, wherein the positive tab (22) and the negative tab (23) are in the shape of a long sheet, and the width of the positive tab (22) and/or the negative tab (23) is 3-6 mm.

8. The soft-packaged button lithium ion battery according to claim 1, wherein each layer of the positive electrode is arranged corresponding to one positive tab.

9. The soft-package button lithium ion battery according to claim 1, wherein each layer of the negative electrode is disposed corresponding to one of the negative electrode tabs.

10. The soft-packaged button lithium ion battery according to claim 1, wherein the soft casing (10) is an aluminum plastic film.

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