CN211605331U - Button type lithium ion battery - Google Patents

Abstract

The utility model relates to a button lithium ion battery, which comprises a hard shell, an electric core accommodated in the hard shell, and an insulating rod which is arranged in the electric core in a penetrating way and has the length larger than the height of the electric core; the battery cell comprises a central through hole for the insulation rod to penetrate through; 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 respectively comprise a first state which is arranged on one side of the central through hole side by side and protrudes out of the end face of the battery cell and forms a set included angle with the end face of the battery cell, and a second state which is pressed downwards towards the direction of the central through hole under the action of external force to form a laminated structure capable of reducing internal resistance and is supported by the insulating rod to be attached to the inner side wall of the hard shell to be in conductive connection. The battery has the advantages of small internal resistance, good quick charging performance and high product yield.

Description

Button type lithium ion battery

Technical Field

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

Background

The application field of the steel shell button lithium ion battery is wide, along with the rise of a wireless Bluetooth headset, the increase range of the steel shell button lithium ion battery is very fast, and the situation that supply is short of demand appears, the traditional button lithium ion battery usually welds a tab in an empty foil area of a pole piece, and meanwhile, the traditional button lithium ion battery is pasted with insulating gummed paper, then the traditional button lithium ion battery is cut into a pole piece required by a winding process, and the anode, the cathode and a diaphragm are wound together on a winding device, because the width of the button battery pole piece is very narrow, the button lithium ion battery is concentrated at 3-6mm, therefore, the situation that the foil area is broken easily appears, the battery is caused to have high internal resistance and other defects, and once the pole piece is broken, the whole battery is scrapp.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in that, a modified knot formula lithium ion battery is provided.

The utility model provides a technical scheme that its technical problem adopted is: constructing a button type lithium ion battery, which comprises a hard shell, a battery cell accommodated in the hard 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;

at least two-layer anodal ear and at least two-layer negative pole on the negative pole ear all including set up side by side one side and the protrusion of central through-hole the terminal surface of electricity core and with the electricity core terminal surface forms the first state of setting for the contained angle setting to and under the exogenic action court central through-hole orientation pushes down and forms the lamination structure that can reduce internal resistance and by the insulating rod support with the second state of rigid housing inside wall laminating in order to carry out conductive connection.

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 hard shell is a steel shell;

the hard shell comprises an upper pole shell and a lower pole shell matched with the upper pole shell;

when the battery is in the second state, the positive lug is attached to the inner wall of the upper pole shell so as to be in conductive connection with the upper pole shell; the negative pole lug is attached to the inner wall of the lower pole shell so as to be in conductive connection with the lower pole shell.

Implement the utility model discloses a knot formula lithium ion battery has following beneficial effect: the button lithium ion battery is characterized in that positive lugs are arranged on at least two layers of positive electrodes in the multilayer positive electrodes of the battery core, negative electrode ears are arranged on at least two layers of negative electrodes in the multilayer negative electrodes, the positive electrode ears and the negative electrode ears are divided into two ends positioned on the battery core, when the button lithium ion battery is assembled, the anode lug and the cathode lug groove which are arranged in a first state and protrude out of the end surface of the battery cell and form a set included angle with the end surface of the battery cell are pressed downwards in the direction of the central through hole of the groove to form a laminated structure capable of reducing internal resistance, the laminated structure is supported by an insulating rod and is attached to the inner side wall of the hard shell for conducting connection, the anode lugs are arranged on at least two layers of anodes, the negative electrode lugs arranged on the at least two layers of negative electrodes can avoid scrapping of the battery after the single lug is broken, and the at least two lugs form a laminated structure, so that the internal resistance of the battery can be greatly reduced, and the quick charging characteristic of the battery can be improved. The 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 button-type lithium ion battery according to some embodiments of the present invention;

fig. 2 is a schematic structural diagram of a cell of the button 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 button lithium ion batteries of the present invention. The button type lithium ion battery can be widely applied to various fields such as 3C digital, intelligent wearing, electric automobiles, medical treatment, military affairs and the like, can avoid scrapping of the battery after the single tab is broken, can greatly reduce the internal resistance of the battery, and further improves the quick charging characteristic of the battery and the product yield. The 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 button-type lithium ion battery may include a hard case 10, a battery cell 20, and an insulating rod 30. Further, in some embodiments, the hard casing 10 may be a pole casing, which may be used to house the battery cell 20 and the insulating rod 30. The battery cell 20 may be disposed in the hard case 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 hard shell 10 may be a metal shell, in particular, in some embodiments, the hard shell 10 may be a steel shell, and it is understood that in other embodiments, the hard shell 10 may not be limited to a steel shell. The hard shell 10 may include an upper pole shell and a lower pole shell. The upper polar shell can be matched with the lower polar shell. The upper pole case may include a first pole case body, a positive electrode disposed in the first pole case body, and a first opening. The first pole shell body is of a hollow structure, and an accommodating cavity can be formed on the inner side of the first pole shell body. The first opening may be disposed at one end of the first electrode casing body, and may be communicated with the accommodating cavity, which may be used for the battery cell 10 to be installed therein. The lower pole piece can include a second pole piece housing body, a negative pole disposed in the second pole piece housing body in isolation from the positive pole, and a second opening. The second diode shell body is of a hollow structure, and an accommodating cavity can be formed on the inner side of the second diode shell body. The second pole piece housing body can be slightly larger than the first pole piece housing body in size, and can be sleeved on the periphery of the first pole piece housing body from the first opening of the first pole piece housing body along the direction of the first pole piece housing body. The second opening can be arranged at one end of the second pole piece shell body, can be communicated with the containing cavity and can be used for the first pole piece shell body to be installed.

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 the side of the first separator 100b 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 rigid casing 10. In some embodiments, the plurality of positive tabs 22 may be provided at equal lengths such that each positive tab may contact the inner wall of the rigid housing 10. 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 pushed down towards 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 part of the insulating rod 30, the insulating rod 30 supports and is attached to the inner side wall of the hard shell 10, so that conductive connection is realized, the whole battery can be prevented from being scrapped after the single positive tab is broken, a parallel circuit structure can be formed, namely, the parallel connection of several batteries can be realized, the internal resistance of the battery core can be reduced, the quick charging characteristic of the battery is improved, and the product yield is improved. Specifically, it can be attached to the inner wall of the upper electrode case to be conductively connected to the positive electrode in the upper electrode case, so that the conductive stability 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, thereby preventing the battery cell from being unable to be installed in the rigid casing 10. In some embodiments, the plurality of negative tabs 22 may be arranged at equal lengths such that each negative tab may contact the inner wall of the rigid casing 10. 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 down towards 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 part of the insulating rod 30, the insulating rod 30 supports and is attached to the inner side wall of the hard shell 10 to realize conductive connection, the rejection of the whole battery after the fracture of a single negative electrode tab can be avoided, in addition, the positive electrode tab 22 and the negative electrode tab 23 are arranged side by side and are respectively positioned on two opposite sides of the central through hole 21, the positive electrode tab 22 and the negative electrode tab 23 on the adjacent positive electrode and negative electrode can form a group of electrodes, so that a plurality of parallel circuit structures can be formed, namely, the parallel connection of several batteries can be equivalent to the parallel connection of the battery core, the internal resistance of the battery core can be. Specifically, it can be attached to the inner wall of the upper electrode shell to be conductively connected to the negative electrode in the lower electrode shell, so that the conductive stability can be improved.

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 button type lithium ion battery is characterized by comprising a hard shell (10), a battery cell (20) accommodated in the hard shell (10), and an insulating rod (30) which is arranged in the battery cell (20) in a penetrating way and has a length larger than the height of the battery cell (20);

the battery core (20) comprises a central through hole (21) for the insulating rod (30) 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);

at least two-layer anodal ear (22) and at least two-layer negative pole on negative pole ear (23) all including set up side by side one side and the protrusion of central through-hole (21) the terminal surface of electricity core (20) and with electricity core (20) terminal surface forms the first state of setting for the contained angle setting, and under the exogenic action court central through-hole (21) orientation pushes down and form the lamination structure that can reduce internal resistance and by insulating rod (30) support with stereoplasm casing (10) inside wall laminating is in order to carry out the second state of conductive connection.

2. The button 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 button lithium ion battery according to claim 1, wherein the battery core (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 button 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 button lithium ion battery according to claim 3, wherein the long side of the positive plate near one side 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 button lithium ion battery according to claim 1, wherein the predetermined angle is 0-90 °.

7. The button 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 button lithium ion battery according to claim 1, wherein each layer of the positive electrode is disposed corresponding to one of the positive tab.

9. The 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. Button lithium ion battery according to claim 1 characterized in that the hard casing (10) is a steel shell;

the hard shell (10) comprises an upper pole shell and a lower pole shell matched with the upper pole shell;

when the lithium battery is in the second state, the positive lug (22) is attached to the inner wall of the upper pole shell so as to be in conductive connection with the upper pole shell; and the negative electrode lug (23) is attached to the inner wall of the lower electrode shell so as to be in conductive connection with the lower electrode shell.

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