CN218160539U - Battery core and battery - Google Patents
Battery core and battery Download PDFInfo
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- CN218160539U CN218160539U CN202222277001.3U CN202222277001U CN218160539U CN 218160539 U CN218160539 U CN 218160539U CN 202222277001 U CN202222277001 U CN 202222277001U CN 218160539 U CN218160539 U CN 218160539U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model provides an electric core and a battery, wherein the electric core comprises a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, the polarities of the first pole piece and the second pole piece are opposite, and the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are sequentially stacked and wound; the first diaphragm and the second diaphragm are compounded on the two opposite side surfaces of the first pole piece respectively. The utility model provides a current electric core turn over the book toward electric core is inside under the exogenic action, produce the risk that makes the battery short circuit, influence the problem of battery security.
Description
Technical Field
The utility model relates to a lithium ion battery technical field particularly, relates to an electricity core and battery.
Background
The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
The main materials of the lithium ion battery include a positive electrode material, a negative electrode material, an electrolyte, a diaphragm, a shell and the like. The diaphragm is one of key inner layer structures, mainly plays a role in separating the positive electrode and the negative electrode of the battery, prevents the two electrodes from being in contact short circuit, and has an ion passing function. With the continuous progress of the manufacturing technology of the lithium ion battery and the higher and higher requirements of people on the energy density of lithium ions, the diaphragm used by the lithium ion battery is thinner and thinner, and the corresponding safety risk is likely to be higher and higher.
At present, in lithium ion battery's manufacture process, the diaphragm at electric core edge usually can outstanding partly, prevents that positive negative pole edge direct contact from leading to internal short circuit, but because the diaphragm is softer, the individual layer diaphragm turns over the book towards electric core inside under the exogenic action easily, leads to local positive negative pole direct contact, and electric core short circuit has serious safety risk.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving current electric core and roll over down electric core inside under the exogenic action and roll over, produce the risk that makes the battery short circuit, influence the problem of the security of battery.
In order to solve the above problems, a first aspect of the present invention provides an electrical core, which includes a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, wherein the polarities of the first pole piece and the second pole piece are opposite, and the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are sequentially stacked and wound;
the first diaphragm and the second diaphragm are compounded on two opposite side surfaces of the first pole piece respectively.
Further, the first pole piece comprises a first current collector and a first active material layer, and the first diaphragm is compounded with the first current collector and the first active material layer.
Further, the first diaphragm is compounded on the surface of the first pole piece, and the second diaphragm is compounded on the surfaces of the first pole piece and the second pole piece.
Further, the second electrode sheet includes a second current collector and a second active material layer, and the second separator is combined with the second current collector and the second active material layer.
Further, the head end of the first diaphragm and the head end of the second diaphragm both comprise extension sections, and the two extension sections are compounded to form the first isolation layer.
Further, the first isolation layer comprises a folded section bent towards the center of the battery core.
Further, the tail end of the first diaphragm and the tail end of the second diaphragm both include extension sections, the two extension sections are compounded to form a second isolation layer, the second isolation layer and the second pole piece are located at the outermost ring of the battery cell, and the projection of the tail end of the second isolation layer in the thickness direction of the battery cell covers the projection of the tail end of the second pole piece in the thickness direction of the battery cell.
Further, the range of the distance between the tail end of the second isolation layer and the tail end of the second pole piece is greater than or equal to 0.5mm.
Furthermore, the tail end of the battery cell is further covered with an adhesive paper layer, the first end of the adhesive paper layer is bonded with the tail end of the second pole piece, the second end of the adhesive paper layer is bonded with the second pole piece close to the outermost ring of the battery cell, and the adhesive paper layer covers the tail end of the second isolation layer.
Further, a range of a distance between the second end of the adhesive paper layer and the tail end of the second pole piece is greater than or equal to 1mm, and/or a range of a distance between the second end of the adhesive paper layer and the tail end of the second isolation layer is greater than or equal to 1mm.
Further, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.
The battery further comprises a first tab and a second tab, wherein a first tab protection glue covers the first tab, the first tab protection glue and a first diaphragm are compounded together, and the first diaphragm covers the first tab protection glue; the second electrode lug is covered with second electrode lug protection glue, the second electrode lug protection glue and the second diaphragm are compounded together, and the second diaphragm covers the second electrode lug protection glue.
Further, the second tab and the second separator are compounded together.
The utility model discloses the second aspect provides a battery, including casing and the arbitrary any of first aspect electric core, electric core encapsulate in the casing.
The utility model provides an electricity core and battery, first diaphragm and second diaphragm are compound respectively at the both sides surface that first pole piece is relative, be in the same place diaphragm and pole piece complex, can avoid individual layer diaphragm to fold over the phenomenon of rolling over or fold toward the inside of electric core under the exogenic action, thereby avoid the problem that local positive negative pole direct contact caused electric core short circuit, and diaphragm and pole piece complex make the thickness homogeneous of electric core structure together, and the roughness is high, be difficult to take place the first pole piece and the not enough condition of second pole piece coverage area, avoid taking place to analyse safety risks such as lithium, the security performance of electric core structure and the battery that uses this electric core structure has been improved.
Drawings
Fig. 1 is a schematic structural diagram of an electrical core provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another electrical core provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the pole piece and the diaphragm provided in the embodiment of the present invention before being combined;
fig. 4 is a schematic structural diagram of a composite of a pole piece and a diaphragm according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of the composite of the pole piece and the diaphragm provided by the embodiment of the present invention.
Description of reference numerals:
10-a first pole piece; 20-a second pole piece; 30-a first membrane; 40-a second membrane; 50-a gummed paper layer; 60-a first tab; 70-a second tab; 80-a first isolation layer; 90-a second isolation layer;
11-a first current collector; 12-a first active material layer; 21-a second current collector; 22-a second active material layer.
Detailed Description
The technical solution of the present invention will be described in detail and clearly with reference to the accompanying drawings. In the description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, only for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. Furthermore, in the description of the present invention, "at least one" means one or more unless specifically limited otherwise.
With reference to fig. 1 and fig. 2, the present embodiment provides a battery cell, which includes a first pole piece 10, a second pole piece 20, a first diaphragm 30, and a second diaphragm 40, where polarities of the first pole piece 10 and the second pole piece 20 are opposite, and the first diaphragm 30, the first pole piece 10, the second diaphragm 40, and the second pole piece 20 are sequentially stacked and wound from a head end to a tail end, so as to form the battery cell.
Referring to fig. 4, the first separator 30 and the second separator 40 may be respectively compounded on two opposite side surfaces of the first pole piece 10, and a schematic structural diagram of a cell formed by the first pole piece 10, the first separator 30 and the second separator 40, and the second pole piece 20 is shown in fig. 1.
As shown in fig. 5, the first separator 30 may be combined on the surface of the first pole piece 10, and the second separator 40 may be combined on the surfaces of the first pole piece 10 and the second pole piece 20; specifically, the first surfaces of the first diaphragm 30 and the second diaphragm 40 are respectively compounded on the two opposite side surfaces of the first pole piece 10, the second surface of the second diaphragm 40 is compounded on the surface of the second pole piece 20, and the first surface and the second surface of the second diaphragm 40 are respectively the two opposite side surfaces of the second diaphragm, so that the first diaphragm 30, the first pole piece 10, the second diaphragm 40 and the second pole piece 20 are compounded into a whole. Fig. 2 shows a schematic structural diagram of a cell formed by combining the first separator 30, the first pole piece 10, the second separator 40, and the second pole piece 20.
The electric core that this embodiment provided, first diaphragm and second diaphragm are compound respectively on the both sides surface that first pole piece is relative, be in the same place diaphragm and pole piece complex, can avoid individual layer diaphragm to turn over the phenomenon of rolling over or fold toward the inside of electric core under the exogenic action, thereby avoid local positive negative pole direct contact to cause the problem of electric core short circuit, and diaphragm and pole piece complex make the thickness homogeneous of electric core structure together, the roughness is high, be difficult to take place the first pole piece and the not enough condition of second pole piece coverage area, avoid taking place to analyse safety risks such as lithium, the security performance of electric core structure and the battery that uses this electric core structure has been improved.
The head end refers to one end of the first pole piece 10 and the second pole piece 20, which start to be wound in the winding process of the battery cell, and the tail end refers to one end of the first pole piece 10 and the second pole piece 20, which finish to be wound in the winding process of the battery cell.
As shown in fig. 3 and 4, the first pole piece 10 includes a first current collector 11 and a first active material layer 12, and the first separator 30 is combined with the first current collector 11 and the first active material layer 12, specifically, the first pole piece 10 has a first side adjacent to the first separator 30, and a second side adjacent to the second separator 40, and the second side and the first side are located on two opposite sides of the first pole piece 10; the first current collector 11 or the first active material layer 12 is located at the position where the first side surface and the first separator 30 are combined, and the first current collector 11 or the first active material layer 12 is located at the position where the second side surface and the second separator 40 are combined.
The first pole piece 10 is a sheet structure in which first active material layers 12 are coated on set areas on two opposite sides of a first current collector 11, and a person skilled in the art can set the set areas according to actual conditions, generally speaking, the first pole piece 10 includes a first pole piece double-sided coating area, a first pole piece single-sided coating area, and a first pole piece double-sided empty foil area, where the first pole piece double-sided coating area refers to that two opposite surfaces of the first current collector 11 are both covered with the first active material layers 12; the first pole piece single-side coating area refers to the situation that one of two opposite surfaces of the first current collector 11 is covered with the first active material layer 12, and the other surface is not covered with the first active material layer 12; the first pole piece double-sided empty foil area means that the first active material layer 12 is not covered on two opposite surfaces of the first current collector 11. If the first active material layer 12 is disposed in the local area of the first side surface, the first separator 30 is combined on the surface of the first active material layer 12, and if the first active material layer 12 is not disposed in the local area of the first side surface, the first separator 30 is combined on the surface of the first current collector 11, and the combination position of the second side surface and the second separator 40 is the same, which is not described herein again.
The winding length of the first diaphragm 30 is greater than that of the first pole piece 10, and the winding length of the second diaphragm 40 is greater than that of the first pole piece 10, so that the battery cell can be better protected.
As shown in fig. 3 and 5, the second electrode sheet 20 includes a second current collector 21 and a second active material layer 22, the second separator 40 is combined with the second current collector 21 and the second active material layer 22, specifically, the second electrode sheet 20 has a third side adjacent to the second separator 40, and the second current collector 21 or the second active material layer 22 is at the position where the third side is combined with the second separator 40.
The second pole piece 20 is a sheet structure in which the second active material layer 22 is coated on the set areas on the two opposite sides of the second current collector 21, and the set areas can be set by those skilled in the art according to practical situations, generally speaking, the second pole piece 20 includes a second pole piece 20 double-sided coating area, a second pole piece 20 single-sided coating area, and a second pole piece 20 double-sided empty foil area, and the second pole piece 20 double-sided coating area means that the two opposite surfaces of the second current collector 21 are both covered with the second active material layer 22; the second pole piece single-side coating area means that one of two opposite surfaces of the second current collector 21 is covered with the second active material layer 22, and the other surface is not covered with the second active material layer 22; the second electrode double-sided empty foil region means that both opposite surfaces of the second current collector 21 are not covered with the second active material layer 22. If the second active material layer 22 is provided in a partial region of the third side surface, the second separator 40 is combined with the surface of the second active material layer 22, and if the second active material layer 22 is not provided in a partial region of the third side surface, the second separator 40 is combined with the surface of the second current collector 21.
The winding length of the first separator 30 is greater than the winding lengths of the first and second pole pieces 10 and 20, and the winding length of the second separator 40 is greater than the winding lengths of the first and second pole pieces 10 and 20, so that the battery cell can be better protected.
Along the winding direction, the head end of first pole piece 10 and the head end dislocation set of second pole piece 20, the tail end of first pole piece 10 and the tail end of second pole piece 20 also dislocation set, from this, be favorable to reducing the space volume of electric core, improve the energy density of electric core.
As shown in fig. 1 and fig. 2, the head end of the first diaphragm 30 and the head end of the second diaphragm 40 both include extension sections, the two extension sections are combined to form the first isolation layer 80, and the first isolation layer 80 includes a folding section that is folded toward the center of the battery core, so that the battery core is conveniently clamped in the winding process of the battery core, and the phenomenon that the head end of the battery core is folded or folded can be avoided.
It should be noted that, in this embodiment, the length of the folded section is not further limited, and those skilled in the art can set the length according to actual situations.
As shown in fig. 1 and fig. 2, the tail ends of the first diaphragm 30 and the second diaphragm 40 each include an extension section, the two extension sections are combined to form a second isolation layer 90, the innermost ring of the battery cell is the first pole piece 10 and the first isolation layer 80, the outermost ring of the battery cell is the second pole piece 20 and the second isolation layer 90, that is, the tail ends of the second pole piece 20 and the second isolation layer 90 are located at the outermost ring of the battery cell, the projection of the tail end of the second isolation layer 90 in the thickness direction of the battery cell covers the projection of the tail end of the second pole piece 20 in the thickness direction of the battery cell, that is, the projection of the tail end of the first diaphragm 30 in the thickness direction of the battery cell covers the projection of the tail end of the second pole piece 20 in the thickness direction of the battery cell, and the projection of the tail end of the second diaphragm 40 in the thickness direction of the battery cell covers the projection of the tail end of the second pole piece 20 in the thickness direction of the battery cell. From this, at the tail end of electric core, first diaphragm 30 and second diaphragm 40's length all is longer than second pole piece 20, make the tail end of electric core have one section not compound empty diaphragm layer with the pole piece, this section empty diaphragm layer is favorable to compound electric core to cut off when the coiling is concluded, realize the continuous winding when pole piece and the whole complex of diaphragm, in addition, this section empty diaphragm layer can also prevent when concluding, the diaphragm turns over a book or fold, thereby make the length of diaphragm be short in the pole piece, the diaphragm is located the inside of pole piece, cause the unable problem that detects of diaphragm.
Specifically, a range of a distance between the tail end of the second isolation layer 90 and the tail end of the second pole piece 20 may be greater than or equal to 0.5mm, that is, a range of a distance between the tail end of the first diaphragm 30 and the tail end of the second pole piece 20 may be greater than or equal to 0.5mm, and a range of a distance between the tail end of the second diaphragm 40 and the tail end of the second pole piece 20 may be greater than or equal to 0.5mm, for example: the range of the distance between the tail end of the first diaphragm 30 and the tail end of the second pole piece 20 may be 0.5mm, 0.8mm, 1mm, or the like, and the range of the distance between the tail end of the second diaphragm 40 and the tail end of the second pole piece 20 may be 0.6mm, 0.9mm, 1.5mm, or the like, so that the problem that the diaphragm cannot be detected due to folding or wrinkling can be further avoided.
The tail end of electric core has still covered glued paper layer 50, the first end of glued paper layer 50 bonds with the position that is close to the tail end of second pole piece 20, the second end of glued paper layer 50 bonds with the second pole piece 20 that is close to the electric core outermost circle, and glued paper layer 50 covers the tail end of second isolation layer 90 to make the tail end of second pole piece 20, the tail end of first diaphragm 30 and the tail end of second diaphragm 40 all be located between the first end and the second end of glued paper layer 50, promptly, glued paper layer 50 covers the tail end of second pole piece 20, the tail end of first diaphragm 30 and the tail end of second diaphragm 40. From this, set up adhesive tape layer 50 at the tail end of electric core, second pole piece 20, first diaphragm 30 and the second diaphragm 40 that can make the electric core tail end all wrap up in adhesive tape layer 50, can carry out better protection to electric core to can further prevent that the diaphragm from turning over a book or fold.
If the cell is wound by N turns, the outermost turn of the cell refers to the nth turn of the cell, and the second pole piece 20 close to the outermost turn of the cell refers to the second pole piece 20 of the (N-1) th turn.
Specifically, a range of a distance between the second end of the adhesive tape layer 50 and the tail end of the second pole piece 20 may be greater than or equal to 1mm, and a range of a distance between the second end of the adhesive tape layer 50 and the tail end of the second isolation layer 90 is greater than or equal to 1mm, that is, a range of a distance between the second end of the adhesive tape layer 50 and the tail end of the first diaphragm 30 may be greater than or equal to 1mm, and a range of a distance between the second end of the adhesive tape layer 50 and the tail end of the second diaphragm 40 may be greater than or equal to 1mm, for example: a distance between the second end of the adhesive paper layer 50 and the tail end of the second pole piece 20 may range to 1.5mm, a distance between the second end of the adhesive paper layer 50 and the tail end of the first separator 30 may range to 1mm, and a distance between the second end of the adhesive paper layer 50 and the tail end of the second separator 40 may range to 1mm.
The first pole piece 10 can be a positive pole piece, and correspondingly, the second pole piece 20 is a negative pole piece; the first pole piece 10 may be a negative pole piece and correspondingly the second pole piece 20 is a positive pole piece. However, in order to avoid the formation of a primary battery by the pole piece of the outermost ring of the battery cell and the casing of the battery, which causes electrochemical corrosion and damage and leakage of the battery, the first pole piece 10 is a negative pole piece, the second pole piece 20 is a positive pole piece, and the outermost ring of the battery cell is the second pole piece 20.
In this embodiment, the battery cell further includes a first tab 60 and a second tab 70, where the first tab 60 may be located between two ends of the first pole piece 10 along the winding direction, specifically, the first tab 60 may be disposed near two ends of the first pole piece 10 along the winding direction, and the first tab 60 may also be located between two ends of the first pole piece 10 along the winding direction, that is, the first tab 60 may be close to the head end or the tail end of the battery cell, and the first tab 60 may also be located in the middle of the battery cell; the second tab 70 may be located between two ends of the second pole piece 20 along the winding direction, specifically, the second tab 70 may be disposed near two ends of the second pole piece 20 along the winding direction, and the second tab 70 may also be located between two ends of the second pole piece 20 along the winding direction, that is, the second tab 70 may be close to the head end or the tail end of the battery cell, and the second tab 70 may also be located in the middle of the battery cell.
The surfaces of the first tab 60 and the second tab 70 are covered with tab protection glue (not marked in the figure), wherein the first tab 60 is covered with the first tab protection glue, the first tab protection glue and the first membrane 30 are combined together, and the first membrane 30 covers the first tab protection glue; the second tab 70 is covered with a second tab protection adhesive, the second tab protection adhesive and the second membrane 40 are combined together, and the second membrane 40 covers the second tab protection adhesive. Therefore, the safety performance of the battery cell can be further improved.
As shown in fig. 5, the first separator 30 is combined on the surface of the first pole piece 10, and the second separator 40 is combined on the surfaces of the first pole piece 10 and the second pole piece 20, so that the second tab 70 may be combined with the second separator 40, or the second tab 70 may not be combined with the second separator 40, but on the basis of the above embodiment, the second tab 70 is combined with the second separator 40 in order to avoid the second pole piece 20 at the head end of the cell from wrinkling or tilting.
In this embodiment, the first pole piece 10 and the second pole piece 20 may be one or more of metal foils such as aluminum foil, copper foil, nickel foil, gold foil, or platinum foil, and preferably, the first pole piece 10 is aluminum foil, the second pole piece 20 is copper foil, the first tab 60 is also aluminum foil, and the second tab 70 is also copper foil.
In the present embodiment, the first active material layer 12 includes a first active material therein, and the first active material may be graphite, silicon, carbon, or other materials with a low potential. The second active material layer 22 includes therein a second active material, which may be lithium cobaltate, lithium iron phosphate, lithium manganate, lithium nickel manganate, etc., but may be other high potential materials in some examples. This embodiment does not further limit this, and those skilled in the art can select the method according to actual situations.
The second aspect of the present embodiment also provides a battery, wherein the battery may be a lithium ion battery, a button battery, or the like, and the battery may be applied to electronic devices such as a mobile phone, a camera, a bluetooth headset, an electronic watch, and an electric toy to provide power for the electronic devices.
The battery at least comprises a battery cell and a casing, wherein the battery cell adopts the above battery cell structure, and the battery cell is packaged in the casing.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications are intended to fall within the scope of the disclosure.
Claims (14)
1. The battery cell is characterized by comprising a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, wherein the polarities of the first pole piece and the second pole piece are opposite, and the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are sequentially stacked and wound;
the first diaphragm and the second diaphragm are compounded on two opposite side surfaces of the first pole piece respectively.
2. The cell of claim 1, wherein the first pole piece comprises a first current collector and a first active material layer, and the first separator is composited with the first current collector and the first active material layer.
3. The cell of claim 1, wherein the first membrane is laminated to the surface of the first pole piece, and the second membrane is laminated to the surfaces of the first pole piece and the second pole piece.
4. The cell of claim 3, wherein the second pole piece comprises a second current collector and a second active material layer, and the second separator is composited with the second current collector and the second active material layer.
5. The cell of claim 1, wherein the head end of the first separator and the head end of the second separator each comprise an extension, and the two extensions are combined to form the first separation layer.
6. The cell of claim 5, wherein the first isolation layer comprises a folded back section that is folded toward a center of the cell.
7. The battery core according to claim 1, wherein the tail end of the first separator and the tail end of the second separator each include an extension section, the two extension sections are combined to form a second isolation layer, the second isolation layer and the second pole piece are located at the outermost circle of the battery core, and a projection of the tail end of the second isolation layer in the thickness direction of the battery core covers a projection of the tail end of the second pole piece in the thickness direction of the battery core.
8. The cell of claim 7, wherein a range of a spacing between the tail end of the second isolation layer and the tail end of the second pole piece is greater than or equal to 0.5mm.
9. The electric core according to claim 7, wherein a glue paper layer covers the tail end of the electric core, a first end of the glue paper layer is bonded to the tail end of the second pole piece, a second end of the glue paper layer is bonded to the second pole piece close to the outermost ring of the electric core, and the glue paper layer covers the tail end of the second isolation layer.
10. The battery cell of claim 9, wherein a range of a spacing between the second end of the adhesive paper layer and the tail end of the second pole piece is greater than or equal to 1mm, and/or a range of a spacing between the second end of the adhesive paper layer and the tail end of the second isolation layer is greater than or equal to 1mm.
11. The electrical core of any one of claims 1 to 10, wherein the first pole piece is a negative pole piece and the second pole piece is a positive pole piece.
12. The battery cell of claim 3, further comprising a first tab and a second tab, wherein the first tab is covered with a first tab protection glue, the first tab protection glue and the first membrane are combined together, and the first membrane covers the first tab protection glue; the second pole ear is covered with the second pole ear protection glue, the second pole ear protection glue and the second diaphragm are compounded together, and the second diaphragm covers the second pole ear protection glue.
13. The electrical core of claim 12, wherein the second tab and the second separator are compounded together.
14. A battery comprising a cell of any of claims 1 to 13 and a casing, the cell being encapsulated within the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222277001.3U CN218160539U (en) | 2022-08-29 | 2022-08-29 | Battery core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222277001.3U CN218160539U (en) | 2022-08-29 | 2022-08-29 | Battery core and battery |
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| Publication Number | Publication Date |
|---|---|
| CN218160539U true CN218160539U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222277001.3U Active CN218160539U (en) | 2022-08-29 | 2022-08-29 | Battery core and battery |
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| CN (1) | CN218160539U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116130850A (en) * | 2023-04-13 | 2023-05-16 | 宁德新能源科技有限公司 | Secondary battery and electric equipment |
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2022
- 2022-08-29 CN CN202222277001.3U patent/CN218160539U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116130850A (en) * | 2023-04-13 | 2023-05-16 | 宁德新能源科技有限公司 | Secondary battery and electric equipment |
| CN116130850B (en) * | 2023-04-13 | 2024-01-16 | 宁德新能源科技有限公司 | Secondary battery and electric equipment |
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