CN217507441U - Battery cell and lithium ion battery - Google Patents
Battery cell and lithium ion battery Download PDFInfo
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- CN217507441U CN217507441U CN202221192997.1U CN202221192997U CN217507441U CN 217507441 U CN217507441 U CN 217507441U CN 202221192997 U CN202221192997 U CN 202221192997U CN 217507441 U CN217507441 U CN 217507441U
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Abstract
The utility model provides an electric core and a lithium ion battery, wherein the electric core comprises a first diaphragm, a first pole piece, a second diaphragm and a second pole piece which are sequentially stacked; the first pole piece comprises a first body and a first pole lug connected with one side of the first body, the first body comprises a first area and a second area positioned between the first area and the first pole lug, and at least one surface of the first area is covered with a first active substance; along the direction from the first diaphragm to the second pole piece, the projection of the first area is positioned inside the projection of the first diaphragm and the second diaphragm, and the projection of the second area is beyond the projection of the first diaphragm and the second diaphragm. The utility model provides a cross cutting of the first pole piece that surpasss the terminal surface of electricity core requires lower and the burr of first pole piece terminal surface to impale the risk reduction of first diaphragm and second diaphragm.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, a electric core is related to, especially, relate to an electric core and lithium ion battery.
Background
Lithium ion batteries have been widely used in electronic products such as portable phones, digital cameras, notebook computers, electric tools, electric vehicles, and the like, because of their advantages of high voltage, high specific energy, wide working temperature range, stable discharge, greenness, no pollution, and good safety.
With the increasing number of personalized electronic products, such as flexible devices, the flexible devices are in the world, which puts higher demands on batteries: i.e. a flexible battery. However, in the bending process of the flexible battery, the interface inside the battery core is often a weak link and is very easy to be damaged, so that the performance of the flexible battery is poor.
The burrs of the end faces of the positive and negative pole pieces in the winding process of the lithium battery cell directly relate to the quality and the service life of the lithium battery. In the conventional cell winding, a first diaphragm is generally used for coating a negative plate, a negative plate is generally used for coating a second diaphragm, and the second diaphragm is generally used for coating a positive plate. The die cutting of the pole piece generally adopts hardware die cutting or laser film cutting, the size requirement on end surface burrs is higher, and further the requirements on hardware cutters and lasers are higher.
CN114050230A discloses a pole piece, electric core, battery cell and battery pack, the pole piece includes a main body, a tab and a support leg, the main body has a first end and a second end opposite to each other, the tab is connected to the first end of the main body and extends outwards, the support leg is connected to the second end of the main body, the first end can be called the tab end, and the second end can be called the non-tab end. The stabilizer blade is along the direction of extension of perpendicular to utmost point ear from a side edge of main part along stretching out set length, therefore, the stabilizer blade protrusion of pole piece in one side of main part, pole piece and the range upon range of formation electric core of diaphragm after, the stabilizer blade can carry on spacingly to the diaphragm in utmost point ear direction of extension, effectively avoid the removal at utmost point ear direction between the pole piece, electric core packs into behind the casing of battery cell, the stabilizer blade can be used to support and hold the casing, realize the support of the second end (non-utmost point ear end) of main part, thereby avoid unsettled, thereby help reinforcing steadiness and security.
CN113363595A discloses a power lithium ion battery and a preparation method thereof, relating to the technical field of battery manufacture, wherein the power lithium ion battery comprises a composite material belt used for winding to form a battery core, the composite material belt comprises a first diaphragm, an anode pole piece, a second diaphragm and a cathode pole piece which are sequentially stacked, the head of the first diaphragm is combined with the head of the second diaphragm to form a head composite area, and the tail of the first diaphragm is combined with the tail of the second diaphragm to form a tail composite area. Through head complex region and afterbody complex region, can carry out the position to the head of anode plate and cathode plate and prescribe a limit to, effectively improve head overlap's problem, simultaneously through the compound mode of head and the afterbody, can in time adsorb on new book needle after the compound material area cuts off, accomplish the diaphragm and at the needle of changing a roll of at the uniform velocity coiling to promote winding efficiency by a wide margin, be favorable to this power lithium ion battery's preparation.
CN207338526U discloses a battery cell and a secondary battery. The battery cell comprises a first pole piece and a second pole piece, wherein the first pole piece comprises a first body and a first pole lug connected to one side of the first body, the first body comprises a first part and a second part, and at least one surface of the first part is provided with a first active substance; the second part is arranged between the first part and the first tab; the second pole piece comprises a second body and a second pole lug connected to one side of the second body, the second body comprises a third part, and at least one surface of the third part is provided with a second active substance; the first body and the second body are arranged oppositely along the thickness direction of the first pole piece, the projection of the second pole lug is positioned outside the projection of the first part along the thickness direction, and the projection of the first pole lug is positioned outside the projection of the third part. This application can guarantee the effect of charging of electric core, prevents that electric core from causing owing to the short circuit that charges to catch fire.
The electric core disclosed at present all has certain defect, thereby has the burr that positive plate and negative plate edge produced to impale the risk that the barrier film caused the electric core short circuit, simultaneously, thereby the cross cutting of pole piece is higher to the burr size requirement of terminal surface and is higher to the requirement of five metals cutter and laser. Therefore, it is important to develop and design a novel cell and a lithium ion battery.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide an electricity core and lithium ion battery, the utility model provides a first pole piece of electricity core surpasss the terminal surface of first diaphragm and second diaphragm, and the cross cutting of the first pole piece that surpasss the terminal surface requires the burr of lower and first pole piece terminal surface to pierce through the risk reduction of first diaphragm and second diaphragm.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the utility model provides an electric core, which comprises a first diaphragm, a first pole piece, a second diaphragm and a second pole piece which are stacked in sequence;
the first pole piece comprises a first body and a first pole lug connected with one side of the first body, the first body comprises a first area and a second area positioned between the first area and the first pole lug, and at least one surface of the first area is covered with a first active substance;
the second pole piece comprises a second body and a second pole lug connected with one side of the second body, the second body comprises a third area, and at least one surface of the third area is covered with a second active substance;
along the direction from the first diaphragm to the second pole piece, the projection of the first area is positioned inside the projection of the first diaphragm and the second diaphragm, and the projection of the second area is beyond the projection of the first diaphragm and the second diaphragm.
The utility model provides a first pole piece is when convoluteing, and the second area of the first body of being connected with first utmost point ear is not covered by first diaphragm and second diaphragm completely to the terminal surface burr that has reduced first pole piece after the coiling pierces through the risk that first diaphragm leads to electric core short circuit with the second diaphragm.
The utility model discloses well cross cutting position is located the second region of the first body of being connected with first utmost point ear, and the second region is not covered by first diaphragm and second diaphragm completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
The utility model provides a first pole piece of electricity core surpasss the terminal surface of first diaphragm and second diaphragm, and the cross cutting of the first pole piece that surpasss the terminal surface requires the lower just burr of first pole piece terminal surface to pierce through the risk reduction of first diaphragm and second diaphragm.
As an optimized technical scheme of the utility model, follow first diaphragm is to the direction of second pole piece, the projection of third region is located inside the projection of first region.
As a preferred technical solution of the present invention, the second body further includes a fourth region, and the fourth region is located between the third region and the second tab.
As an optimized technical solution of the present invention, along the direction from the first diaphragm to the second pole piece, the projection of the fourth region exceeds the projection of the first diaphragm and the second diaphragm.
The utility model provides a second pole piece is when convoluteing, and the fourth region of the second body of being connected with the second pole ear is not covered by first diaphragm and second diaphragm completely to the terminal surface burr that has reduced the coiling back second pole piece pierces through the risk that first diaphragm leads to electric core short circuit with the second diaphragm.
The utility model discloses well cross cutting position is located the fourth region with the second body that the second ear is connected, and the fourth region is not covered by first diaphragm and second diaphragm completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
The utility model provides a second pole piece of electricity core surpasss the terminal surface of first diaphragm and second diaphragm, and the cross cutting that surpasss the second pole piece of terminal surface requires lower just the burr of second pole piece terminal surface to pierce through the risk reduction of diaphragm.
As a preferred technical solution of the present invention, along the direction from the first diaphragm to the second pole piece, the two opposite surfaces of the first region are covered with the first active material;
and a second active substance is covered on two opposite surfaces of the third area along the direction from the first diaphragm to the second pole piece.
As an optimized technical solution of the present invention, the first tab and the second tab are located on two sides of the battery cell.
As an optimal technical scheme of the utility model, first pole piece is the negative pole piece, the second pole piece is positive pole piece.
As an optimal technical scheme of the utility model, form lamination electricity core or begin to coil along length direction from the coiling end and obtain coiling electricity core after first pole piece, first diaphragm, second pole piece and the coincide of second diaphragm.
In a second aspect, the present invention provides a lithium ion battery, which includes the electrical core of the first aspect.
As an optimal technical scheme of the utility model, lithium ion battery is square shell battery, cylinder battery or laminate polymer battery.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides a first pole piece is when convoluteing, and the second area of the first body of being connected with first utmost point ear is not covered by first diaphragm and second diaphragm completely to the terminal surface burr that has reduced first pole piece after the coiling pierces through the risk that first diaphragm leads to electric core short circuit with the second diaphragm.
(2) The utility model discloses well cross cutting position is located the second region of the first body of being connected with first utmost point ear, and the second region is not covered by first diaphragm and second diaphragm completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
(3) The utility model provides a second pole piece is when convoluteing, and the fourth region of the second body of being connected with the second pole ear is not covered by first diaphragm and second diaphragm completely to the terminal surface burr that has reduced the coiling back second pole piece pierces through the risk that first diaphragm leads to electric core short circuit with the second diaphragm.
(4) The utility model discloses well cross cutting position is located the fourth region with the second body that the second ear is connected, and the fourth region is not covered by first diaphragm and second diaphragm completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
Drawings
Fig. 1 is a schematic structural diagram of the first pole piece after being unfolded according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the battery cell provided by an embodiment of the present invention after being unfolded.
Fig. 3 is a schematic structural diagram of the first pole piece, the first diaphragm, the second pole piece and the second diaphragm stacked in sequence according to an embodiment of the present invention.
Wherein, 1-a first membrane; 2-a first pole piece; 3-a second membrane; 4-a second pole piece; 5-a first tab; 6-a first region; 7-a second region; 8-a second tab; 9-a third region; 10-fourth region.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In a specific embodiment, the present invention provides an electrical core, as shown in fig. 1, the electrical core includes a first diaphragm 1, a first pole piece 2, a second diaphragm 3, and a second pole piece 4 stacked in sequence;
as shown in fig. 2, the first pole piece 2 includes a first body and a first tab 5 connected to one side of the first body, the first body includes a first region 6 and a second region 7 located between the first region 6 and the first tab 5, at least one surface of the first region 6 is covered with a first active material;
the second pole piece 4 comprises a second body and a second pole lug 8 connected with one side of the second body, the second body comprises a third area 9, and at least one surface of the third area 9 is covered with a second active substance;
as shown in fig. 3, in the direction from the first membrane 1 to the second pole piece 4, the projection of the first area 6 is located inside the projection of the first membrane 1 and the second membrane 3, and the projection of the second area 7 is beyond the projection of the first membrane 1 and the second membrane 3.
The utility model provides a first pole piece 2 is when convoluteing, and the second region 7 of the first body of being connected with first utmost point ear 5 is not covered by first diaphragm 1 and second diaphragm 3 completely to the terminal surface burr that has reduced first pole piece 2 after the coiling pierces through the risk that first diaphragm 1 leads to electric core short circuit with second diaphragm 3.
The utility model discloses well cross cutting position is located the second region 7 of the first body of being connected with first utmost point ear 5, and second region 7 is not covered by first diaphragm 1 and second diaphragm 3 completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
The utility model provides a first pole piece 2 of electricity core surpasss first diaphragm 1 and second diaphragm 3's terminal surface, surpasss the cross cutting of the first pole piece 2 of terminal surface and requires the lower just burr of 2 terminal surfaces of first pole piece to pierce through the risk reduction of first diaphragm 1 and second diaphragm 3.
Further, the projection of the third area 9 is located inside the projection of the first area 6 in the direction of the first membrane 1 to the second pole piece 4.
Further, the second body further comprises a fourth region 10, and the fourth region 10 is located between the third region 9 and the second pole ear 8.
Further, in the direction from the first membrane 1 to the second pole piece 4, the projection of the fourth area 10 is beyond the projection of the first membrane 1 and the second membrane 3.
The utility model provides a second pole piece 4 is when convoluteing, and the fourth region 10 of the second body of being connected with second pole ear 8 is not covered by first diaphragm 1 and second diaphragm 3 completely to the terminal surface burr that has reduced coiling back second pole piece 4 pierces through the risk that first diaphragm 1 leads to electric core short circuit with second diaphragm 3.
The utility model discloses well cross cutting position is located the fourth region 10 of the second body of being connected with second utmost point ear 8, and fourth region 10 is not covered by first diaphragm 1 and second diaphragm 3 completely to lead to the reduction and the extension of cross cutting equipment life to the requirement of five metals cross cutting or laser membrane cutting equipment.
The utility model provides a second pole piece 4 of electricity core surpasss first diaphragm 1 and second diaphragm 3's terminal surface, surpasss the cross cutting of second pole piece 4 of terminal surface and requires the lower and burr of 4 terminal surfaces of second pole piece to pierce through the risk reduction of diaphragm.
Further, in the direction from the first separator 1 to the second electrode 4, the first region 6 is covered with a first active material on both of the opposite surfaces;
in the direction from the first separator 1 to the second electrode 4, the third region 9 is covered with a second active material on both opposite surfaces.
Further, the first tab 5 and the second tab 8 are located on two sides of the battery cell.
Further, the first pole piece 2 is a negative pole piece, and the second pole piece 4 is a positive pole piece.
Further, the first pole piece 2, the first diaphragm 1, the second pole piece 4 and the second diaphragm 3 are stacked to form a laminated cell or wound from a winding end along the length direction to obtain a wound cell.
In another embodiment, the present invention provides a lithium ion battery comprising the cell of the first aspect.
Further, the lithium ion battery is a square-shell battery, a cylindrical battery or a soft package battery.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. The battery cell is characterized by comprising a first diaphragm, a first pole piece, a second diaphragm and a second pole piece which are sequentially stacked;
the first pole piece comprises a first body and a first pole lug connected with one side of the first body, the first body comprises a first area and a second area positioned between the first area and the first pole lug, and at least one surface of the first area is covered with a first active substance;
the second pole piece comprises a second body and a second pole lug connected with one side of the second body, the second body comprises a third area, and at least one surface of the third area is covered with a second active substance;
along the direction from the first diaphragm to the second pole piece, the projection of the first area is positioned inside the projection of the first diaphragm and the second diaphragm, and the projection of the second area is beyond the projection of the first diaphragm and the second diaphragm.
2. The cell of claim 1, wherein a projection of the third region is located within a projection of the first region in a direction from the first membrane to the second pole piece.
3. The cell of claim 1, wherein the second body further comprises a fourth region located between the third region and the second pole ear.
4. The cell of claim 3, wherein a projection of the fourth region in a direction from the first membrane to the second pole piece is beyond a projection of the first membrane and the second membrane.
5. The cell of claim 1, wherein, in a direction from the first separator to the second pole piece, opposite surfaces of the first region are covered with a first active material;
and a second active substance is covered on two opposite surfaces of the third area along the direction from the first diaphragm to the second pole piece.
6. The cell of claim 1, wherein the first and second tabs are located on opposite sides of the cell.
7. The electrical core of claim 1, wherein the first pole piece is a negative pole piece and the second pole piece is a positive pole piece.
8. The cell of claim 1, wherein the first pole piece, the first separator, the second pole piece, and the second separator are stacked to form a laminated cell or are wound in a length direction from a winding end to obtain a wound cell.
9. A lithium ion battery, characterized in that the lithium ion battery comprises the battery cell of any one of claims 1 to 8.
10. The lithium ion battery of claim 9, wherein the lithium ion battery is a square-can battery, a cylindrical battery, or a pouch battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221192997.1U CN217507441U (en) | 2022-05-17 | 2022-05-17 | Battery cell and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221192997.1U CN217507441U (en) | 2022-05-17 | 2022-05-17 | Battery cell and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217507441U true CN217507441U (en) | 2022-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221192997.1U Active CN217507441U (en) | 2022-05-17 | 2022-05-17 | Battery cell and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217507441U (en) |
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2022
- 2022-05-17 CN CN202221192997.1U patent/CN217507441U/en active Active
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