CN221008978U - High-energy-density battery cell and lithium battery - Google Patents
High-energy-density battery cell and lithium battery Download PDFInfo
- Publication number
- CN221008978U CN221008978U CN202322199027.5U CN202322199027U CN221008978U CN 221008978 U CN221008978 U CN 221008978U CN 202322199027 U CN202322199027 U CN 202322199027U CN 221008978 U CN221008978 U CN 221008978U
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- China
- Prior art keywords
- cathode
- coating
- foil
- anode
- pole piece
- Prior art date
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 106
- 239000011248 coating agent Substances 0.000 claims abstract description 100
- 239000011888 foil Substances 0.000 claims abstract description 85
- 238000004804 winding Methods 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 239000011247 coating layer Substances 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 238000007755 gap coating Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000283070 Equus zebra Species 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
Classifications
-
- 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
-
- 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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- Primary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a high-energy-density battery cell and a lithium battery, wherein the battery cell comprises an anode pole piece and a cathode pole piece, the anode pole piece comprises an anode foil and an anode coating, the cathode pole piece comprises a cathode foil and a cathode coating, and the cathode pole piece and the anode pole piece are laminated and form a winding structure; the anode coating is coated on all surfaces of two sides of the anode foil, and the cathode coating is coated on part of surfaces of two sides of the cathode foil, so that the cathode foil comprises an empty foil area, a single-sided coating area and a double-sided coating area; the empty foil area is positioned at the inner ring of the winding structure and is independently coiled, and the double-sided coating area and the anode pole piece are overlapped to be coiled. The anode plate of the battery cell provided by the utility model is provided with the fully-covered anode coating, the hollow foil area and part of the single-sided coating area of the cathode plate are independently coiled in the inner circle, the problem of coating gap material of the anode plate existing in the conventional battery cell is solved, and the energy density of the battery cell is improved.
Description
Technical Field
The utility model relates to the technical field of camera shooting, in particular to a high-energy-density battery cell and a lithium battery.
Background
The battery core of the lithium battery is made by winding positive and negative pole pieces and a diaphragm, the pole pieces are generally made by coating active substances on metal foils, and the coating surface density of the active substances has a great influence on the charging rate of the lithium battery. At present, with the increasing requirement of electronic products on the charging rate, the battery core design is more and more prone to adopting a coating mode with thin surface density, so that the charging rate can be improved.
For example, the chinese patent document with application publication No. CN115084449a discloses a method for manufacturing a lithium battery fast-charging negative electrode plate and a lithium ion battery, and by optimizing a proper negative electrode surface density, the coating surface density is reduced, which is beneficial to shortening the lithium ion transmission distance and reducing the migration resistance of lithium ions; providing a more spacious lithium ion migration path by optimally selecting a suitable negative electrode compaction density; by precoating the current collector with the conductive carbon layer, the contact resistance between the negative electrode material and the current collector is reduced, and the adhesion capability between the negative electrode material and the current collector is improved, so that the quick charge performance of the battery is improved.
The existing pole piece coating process is that an anode pole piece (a cathode pole piece) and a cathode pole piece (an anode pole piece) are respectively manufactured into a pole piece for winding by adopting a zebra type gap coating mode through rolling, slitting and baking, wherein the pole piece generally comprises an empty foil area, a single-sided coating area and a double-sided coating area, and when a battery cell is wound, the empty foil area and/or the single-sided coating area of the anode pole piece are/is wound for a certain length independently and then are wound together with the cathode pole piece; the cathode and anode plates of the battery core manufactured by the method have similar structures, namely, the battery core is provided with an empty foil area, a single-side coating area and a double-side coating area, so that the coating process and the supervision content of the electrode plates are similar, and the production cost is reduced.
Under the prior coating process, the surface density of the coating is reduced, and the following technical problems are brought about: when the density of the coating surface of the anode pole piece is thinned, in the slurry coating process, slurry is brought to the empty foil at the coating gap of the anode pole piece because the viscosity of the anode slurry is generally much lower than that of the cathode slurry; in comparison, because the slurry viscosity of the cathode pole piece is high, the probability of generating gap strip materials during gap coating is low; therefore, the problem of anode pole piece coating gap strip material affects the coating quality of the pole piece and reduces the yield of products;
In addition, the anode pole piece of the existing battery cell generally adopts copper foil, the cathode pole piece adopts aluminum foil, and the copper foil is softer than the aluminum foil, so that the copper foil is easy to fold and fold when being wound, and when the empty foil area and/or the single-sided coating area of the anode pole piece are wound independently, the existing conventional battery cell structure needs to be stuck with crease-resistant gummed paper at the winding head of the anode pole piece, so that the thickness of the battery cell can be increased, and the energy density of a finished battery cell can be reduced.
In view of this, improvements in the structure of the existing battery cells are needed.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model provides a high-energy-density battery cell and a lithium battery, which are used for solving the problem of coating gap material on an anode pole piece in the existing battery cell and improving the energy density of the battery cell.
The utility model discloses a high-energy-density battery cell, which comprises an anode pole piece and a cathode pole piece, wherein the anode pole piece comprises an anode foil and an anode coating, the cathode pole piece comprises a cathode foil and a cathode coating, and the cathode pole piece and the anode pole piece are laminated and form a winding structure; the anode coating is coated on all surfaces of two sides of the anode foil, and the cathode coating is coated on part of surfaces of two sides of the cathode foil, so that the cathode foil comprises an empty foil area, a single-sided coating area and a double-sided coating area; the empty foil area is positioned at the inner ring of the winding structure and is independently coiled, and the double-sided coating area and the anode pole piece are overlapped to be coiled.
Preferably, a portion of the segment of the single-sided coated region adjacent to the empty foil region is individually rolled.
Preferably, the portions of the single-sided coating region other than the single-sided coating region are overlapped with the anode sheet to be rolled.
Preferably, one turn of the outermost layer of the winding structure is the single-sided coating area of the cathode pole piece.
Preferably, the cathode coating of the single-sided coating region faces the inner side of the cell winding structure, and the exposed region of the cathode foil of the single-sided coating region faces the outer side of the cell winding structure.
Preferably, a plurality of gummed papers are stuck on the cathode pole piece, wherein one gummed paper is stuck on the cathode coating of the single-sided coating area, and the cathode coating of the single-sided coating area is positioned at the initial end of the inner ring of the battery cell.
Preferably, the cathode coating of the other piece of gummed paper attached to the double-sided coating area is located at the starting end of the inner ring of the battery cell.
Preferably, each piece of the gummed paper has a part of the gummed paper covered on the cathode foil and another part of the gummed paper covered on the surface of the cathode coating, and the gummed paper has a length of 0.5-10 mm covered on the cathode foil and a length of 0.5-10 mm covered on the cathode coating in the winding direction.
Preferably, the anode foil is copper foil and the cathode foil is aluminum foil.
The utility model discloses a lithium battery which comprises any one of the battery cores.
The utility model has the beneficial effects that:
The cathode pole piece is arranged to be in a structure of an empty foil area, a single-sided coating area and a double-sided coating area, and the anode pole piece is arranged to be in a structure of double-sided covered by the anode coating, and in a winding structure of the battery core, partial areas of the empty foil area and the single-sided coating area of the cathode pole piece are independently wound on the winding inner ring, so that the phenomena of folding and wrinkling easily occurring when the anode foil is independently wound on the winding inner ring can be avoided, and crease-resistant gummed paper is not required to be attached on the inner ring of the battery core, the thickness of the battery core after winding is reduced, and the integral energy density of the battery core is improved;
In addition, the anode plate is set to be fully covered by the active coating, and in the coating process, the active coating on the anode plate can be continuously coated without setting a gap, so that the problem of coating gap material on the anode plate existing in the conventional battery cell is solved, the coating quality is improved, the yield of products is greatly improved, and the product quality of the battery cell manufactured after winding is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic view of the structure of a developed cathode sheet;
FIG. 2 is a schematic view of the structure of the expanded anode sheet;
Fig. 3 is a schematic structural diagram of a battery cell according to the present utility model.
Reference numerals illustrate: 1. a battery cell; 11. an anode pole piece; 111. an anode foil; 112. an anode coating; 12. a cathode pole piece; 1201. an empty foil region; 1202. a single-sided coating zone; 1203. a double-sided coating zone; 121. a cathode foil; 122. a cathode coating; 123. glue paper; 13. a diaphragm.
Detailed Description
Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.
It should be noted that all directional indicators such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the utility model, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
Referring to fig. 1-3, in order to disclose a high energy density battery cell according to the present utility model, the battery cell 1 includes an anode pole piece 11, a cathode pole piece 12 and a diaphragm 13, the anode pole piece 11, the cathode pole piece 12 and the diaphragm 13 are stacked on each other, and the diaphragm 13 is disposed between the anode pole piece 11 and the cathode pole piece 12, and the three are wound to form the above-mentioned battery cell 1 structure.
Referring to fig. 2, the anode sheet 11 for winding the above-described battery cell 1 includes an anode foil 111 and an anode coating layer 112, wherein the anode foil 111 is a metal foil, specifically, the anode foil 111 employs a copper foil, the anode foil 111 is a strip-shaped structure, the anode coating layer 112 is coated on both side surfaces of the anode foil 111, and on each side surface of the anode foil 111, the anode coating layer 112 is continuously coated along the length direction of the anode foil 111, and the surface of the anode foil 111 is entirely covered, so that the anode sheet 11 as a whole presents a structure in which the anode coating layer 112 is continuously distributed in the length direction thereof.
Referring to fig. 1, the cathode sheet 12 for winding the above-mentioned battery cell 1 includes a cathode foil 121 and a cathode coating layer 122, wherein the cathode foil 121 is a metal foil, specifically, the cathode foil 121 is an aluminum foil, the cathode foil 121 is a strip structure, the cathode coating layer 122 is coated on both side surfaces of the cathode foil 121, but the cathode coating layer 122 does not entirely cover the surface of the cathode foil 121 on each side surface of the cathode foil 121, so that the surface of the cathode foil 121 has a bare empty foil.
Referring to fig. 1, specifically, the cathode coatings 122 are spaced apart along the length direction of the cathode sheet 12 such that the cathode sheet 12 forms an empty foil region 1201 in which both side surfaces of the cathode foil 121 are empty foils coated with the cathode-free coating 122, a single-sided coating region 1202 in which one side surface of the cathode foil 121 is covered with the cathode coating 122 and the other side is covered with the cathode-free coating 122, and a double-sided coating region 1203 in which both side surfaces of the cathode foil 121 are covered with the cathode coating 122.
Referring to fig. 1 to 3, in the winding structure of the cell 1, the empty foil region 1201 of the cathode electrode sheet 12 is located at the inner ring of the winding structure, and the empty foil region 1201 of the cathode electrode sheet 12 does not overlap with the anode electrode sheet 11, i.e., the empty foil region 1201 of the cathode electrode sheet 12 is individually rolled at the initial portion of the inner ring of the cell 1, whereas only a portion of the segment of the single-sided coating region 1202 of the cathode adjacent to the empty foil region 1201 is not overlapped with the anode electrode sheet 11 and is individually rolled, and the remaining portions are all overlapped and wound with the anode electrode sheet 11; the outermost circle of the winding structure of the battery cell 1 is covered by the cathode pole piece 12, the outermost circle is a single-sided coating area 1202 of the cathode pole piece 12, the cathode coating 122 of the single-sided coating area 1202 faces the inner side of the battery cell 1, and the surface of the cathode foil 121 coated by the cathode-free coating 122 faces the outer side of the battery cell 1; all areas of the anode sheet 11 overlap with the single-sided coated area 1202 and/or the double-sided coated area 1203 of the cathode sheet 12.
Referring to fig. 3, the cathode coating 122 of the single-sided coating area 1202 of the cathode pole piece 12 is adhered with a gummed paper 123 at the initial end of the inner ring of the cell 1, and the cathode coating 122 of the double-sided coating area 1203 is also adhered with a gummed paper 123 at the initial end of the inner ring of the cell 1, each gummed paper 123 has a part covered on the cathode foil 121 and another part covered on the surface of the cathode coating 122, the gummed paper 123 has a length of 0.5-10 mm covering the cathode foil 121 and a length of 0.5-10 mm covering the cathode coating 122, and the gummed paper 123 can protect the initial position of the cathode coating 122.
The utility model also discloses a lithium battery, which comprises the battery core 1.
The implementation principle and the beneficial effects of the utility model are that the cathode pole piece 12 is arranged into a structure of the empty foil area 1201, the single-sided coating area 1202 and the double-sided coating area 1203, and the anode pole piece 11 is arranged into a structure of which both sides are fully covered by the anode coating 112, and in the winding structure of the battery core 1, partial areas of the empty foil area 1201 and the single-sided coating area 1202 of the cathode pole piece 12 are singly coiled at the winding inner ring, so that the phenomena of folding and wrinkling which are easy to occur when the anode foil 111 is singly coiled at the winding inner ring can be avoided, the anti-wrinkling gummed paper 123 is not required to be stuck at the inner ring of the battery core 1, the thickness of the battery core 1 after the winding is reduced, and the integral energy density of the battery core 1 is improved;
In addition, the anode pole piece 11 is arranged to be fully covered by the active coating, and in the coating process, the active coating on the anode pole piece 11 can be continuously coated without a gap, so that the problem of gap material carrying in the coating of the anode pole piece 11 of the traditional battery cell 1 is solved, the coating quality is improved, the product yield is greatly improved, and the product quality of the battery cell 1 manufactured after winding is improved.
The above is merely an embodiment of the present utility model, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.
Claims (10)
1. A high energy density cell, characterized in that the cell (1) comprises an anode pole piece (11) and a cathode pole piece (12), the anode pole piece (11) comprises an anode foil (111) and an anode coating (112), the cathode pole piece (12) comprises a cathode foil (121) and a cathode coating (122), and the cathode pole piece (12) and the anode pole piece (11) are laminated and form a winding structure;
The anode coating (112) is coated on all surfaces of both sides of the anode foil (111), and the cathode coating (122) is coated on part of the surfaces of both sides of the cathode foil (121), so that the cathode foil (121) comprises an empty foil region (1201), a single-sided coating region (1202) and a double-sided coating region (1203);
The empty foil area (1201) is positioned on the inner ring of the winding structure and is rolled independently, and the double-sided coating area (1203) is overlapped with the anode pole piece (11) to be rolled.
2. The high energy density cell of claim 1, wherein a portion of the segments of the single-sided coated region (1202) adjacent to the empty foil region (1201) are individually rolled.
3. The high energy density cell of claim 2, wherein portions of the single-sided coated region (1202) other than the individual rolls overlap the anode electrode sheet (11) in rolls.
4. A high energy density cell according to any of claims 1-3, characterized in that the outermost turn of the winding structure is the single-sided coated area (1202) of the cathode sheet (12).
5. The high energy density cell of claim 4, wherein the cathode coating (122) of the single sided coating region (1202) is directed towards the inside of the cell (1) winding structure and the bare area of the cathode foil (121) of the single sided coating region (1202) is directed towards the outside of the cell (1) winding structure.
6. A high energy density cell according to any one of claims 1-3, wherein a plurality of glue papers (123) are attached to the cathode pole piece (12), wherein one of the glue papers (123) is attached to the cathode coating (122) of the single-sided coating area (1202) at the starting end of the inner ring of the cell (1).
7. The high energy density cell of claim 6, wherein the cathode coating (122) of the other piece of said gummed paper (123) applied to the double coated area (1203) is located at the starting end of the inner ring of the cell (1).
8. The high energy density cell of claim 7, wherein each of said webs (123) has a portion covering said cathode foil (121) and another portion covering said cathode coating (122), said webs (123) covering said cathode foil (121) by a length of 0.5 to 10mm and said cathode coating (122) by a length of 0.5 to 10mm in a winding direction.
9. A high energy density cell according to any of claims 1-3, wherein the anode foil (111) is copper foil and the cathode foil (121) is aluminum foil.
10. A lithium battery, characterized in that it comprises a cell (1) according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322199027.5U CN221008978U (en) | 2023-08-15 | 2023-08-15 | High-energy-density battery cell and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322199027.5U CN221008978U (en) | 2023-08-15 | 2023-08-15 | High-energy-density battery cell and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221008978U true CN221008978U (en) | 2024-05-24 |
Family
ID=91120646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322199027.5U Active CN221008978U (en) | 2023-08-15 | 2023-08-15 | High-energy-density battery cell and lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221008978U (en) |
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2023
- 2023-08-15 CN CN202322199027.5U patent/CN221008978U/en active Active
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