CN210926204U - Winding battery cell - Google Patents
Winding battery cell Download PDFInfo
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- CN210926204U CN210926204U CN201922120867.1U CN201922120867U CN210926204U CN 210926204 U CN210926204 U CN 210926204U CN 201922120867 U CN201922120867 U CN 201922120867U CN 210926204 U CN210926204 U CN 210926204U
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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 a coiling electricity core, include: the first pole piece comprises a first pole piece double-sided coating area; the second pole piece is opposite to the polarity of the first pole piece and comprises a second pole piece double-side coating area and a second pole piece single-side coating area; the second pole piece single-side coating area is arranged in a bending area when the second pole piece is wound, one side of the second pole piece single-side coating area, which is back to the winding center of the winding battery cell, is a coating area, and one side of the second pole piece single-side coating area, which faces the winding center of the winding battery cell, is an uncoated area; a diaphragm disposed between the first pole piece and the second pole piece. Compared with the prior art, the utility model discloses a first pole piece has left out the setting in single face coating district, and the department of buckling when the second pole piece is convoluteed sets up single face coating district, has improved the lithium risk of analysing that the single face district of coiling electric core exists at present, and the fracture risk does not appear in making the pole piece when improving the compaction density of pole piece, has reached the purpose that promotes electric core energy density.
Description
Technical Field
The utility model relates to a lithium ion battery field, concretely relates to coiling electricity core.
Background
Since the commercialization of lithium ion batteries, lithium ion batteries have been widely used in the fields of various electronic products such as mobile phones, tablets, notebook computers, mobile power supplies and the like due to their advantages of light weight, high energy density, long cycle life, good safety and the like; in recent years, with the development of thinning and lightening of electronic products such as mobile phones and flat panels, the demand for higher energy density of batteries has been increasing.
Currently, the negative electrodes of most manufacturers are continuously coated in a single-sided and double-sided staggered manner, because the compaction density of a negative electrode active material (such as one or more of artificial graphite, natural graphite, amorphous carbon, hard carbon and the like) is lower than that of a positive electrode active material, the compaction density of a single-sided coating area caused by the single-sided and double-sided staggered coating of the negative electrode in a rolling process is much smaller than that of the negative electrode double-sided coating area, and the difference between the resistance and impedance of a diaphragm of the single-sided coating area and the negative electrode double-sided area; in the circulation process of the lithium ion battery, the risk of preferential lithium precipitation in a single-side coating area is easily caused, and the circulation life and the safety performance of the battery are seriously influenced.
In addition, as the demand of higher energy density of the lithium ion battery is increasingly improved, in order to pursue higher energy density, the compaction density of the positive electrode active substance is increasingly higher, and meanwhile, the positive electrode current collector is increasingly thinner, so that the positive electrode sheet has the risk of sheet breakage after cold pressing; in addition, with the continuous cycle use of the battery under different conditions, the battery is easy to cause the risk of fragment of the inner ring of the winding core of the positive plate due to the expansion of the battery caused by the material and the structure of the battery, so that the battery is out of service.
In view of the above, it is necessary to provide a technical solution to the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the winding battery cell is provided, the single-side regional lithium precipitation risk is improved, the compaction density of the positive plate is improved, the risk of the positive plate breaking is avoided, and the purpose of improving the energy density of the battery cell is achieved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a wound cell, comprising:
the first pole piece comprises a first pole piece double-sided coating area;
the second pole piece is opposite to the polarity of the first pole piece and comprises a second pole piece double-side coating area and a second pole piece single-side coating area; the second pole piece single-side coating area is arranged in a bending area when the second pole piece is wound, one side of the second pole piece single-side coating area, which is back to the winding center of the winding battery cell, is a coating area, and one side of the second pole piece single-side coating area, which is facing to the winding center of the winding battery cell, is an uncoated area;
a diaphragm disposed between the first pole piece and the second pole piece.
The utility model discloses a first pole piece adopts two-sided continuous coating, and does not have the condition of dislocation coating, because first pole piece has left out single face coating district to avoided the diaphragm resistance that arouses by single face coating district and corresponding impedance relative main part increase, lead to the condition of analysing the lithium risk, improved life cycle and security performance. Additionally, the utility model discloses a second pole piece has included single face coating district, with single face coating district setting bending zone when convoluteing and at the outside coating active material in bending zone for the second pole piece has guaranteed its active material at the roll-in-process and has not received under the condition damaged or destruction, has promoted the compaction density of pole piece and has not aroused the broken piece risk that coiling formula electricity core bending department caused, thereby is showing and has promoted energy density.
Preferably, the first pole piece further comprises a first empty foil area arranged at the end of the first pole piece; the second pole piece further comprises a second empty foil area arranged at the tail end of the second pole piece, and the first empty foil area and the second empty foil area are arranged oppositely.
Preferably, the first empty foil area is connected with a first tab, and the second empty foil area is connected with a second tab. If the tab is arranged in the winding interior, a blank foil area needs to be reserved in the winding interior, and the reserved blank foil area is often larger than the area of the tab, so that an unnecessary blank foil area exists between the tab and the coating area, and a height difference exists between the blank foil area and the coating area, and meanwhile, the unnecessary blank foil area is opposite to the coating area on the other pole piece, namely, a coating area which does not correspond to the coating area is formed, namely, a situation of dislocation exists, and therefore, the energy density of the battery cell is reduced. And the utility model discloses set up utmost point ear on the empty paper tinsel district of electric core outer lane, because this empty paper tinsel district corresponds be the empty paper tinsel district on another pole piece promptly, avoided the aforesaid the situation to the energy density of electric core has been improved.
Preferably, the first tab is integrally formed with the first empty foil area or the first tab is welded to the first empty foil area; the second tab and the second empty foil area are integrally formed or the second tab is welded to the second empty foil area.
Preferably, the first tab is arranged in parallel to the width direction of the first pole piece; the second pole lug is arranged in parallel to the width direction of the second pole piece.
Preferably, the bending region comprises a bending part and two end extension regions adjacent to the bending part. Expanding the uncoated area to extend the uncoated area to both end areas increases the stress range of the second pole piece during rolling, reducing the risk of its breaking at the bend.
Preferably, the second pole piece single-side coated area comprises a first single-side coated area, and the first single-side coated area is arranged in a first bending area when the second pole piece is wound.
Preferably, the second pole piece single-side coated area further comprises a second single-side coated area, and the second single-side coated area is arranged in a second bending area when the second pole piece is wound.
Preferably, the second pole piece single-side coating area further comprises a third single-side coating area, and the third single-side coating area is arranged in a third bending area when the second pole piece is wound. In the roll-in process, the bending part of the preceding several times of coiling of electric core is because the aforesaid does not have the stress condition that corresponding thickness can reduce its bending part, and it is very big fragment risk to be present in the coiling earlier stage of electric core promptly, the utility model discloses the coiling bending zone of cubic uses the single face coating in the past, sets up the inboard of bending zone into not coating the district, has reduced the active material of inboard bending part and has aroused the fragment risk because of the roll-in, also can make simultaneously the second pole piece guarantee in the roll-in-process that its active material does not receive under the condition of damage or destruction, improve active material's compaction density and do not arouse the fragment risk that coiling electric core bending part led to the fact to show the energy density who has promoted electric core.
Preferably, the lengths of the uncoated areas of the first single-side coated area, the second single-side coated area and the third single-side coated area are all 2-8 mm. More preferably, the lengths of the uncoated areas of the first single-side coated area, the second single-side coated area and the third single-side coated area are all 3-6 mm. If the length of the uncoated region is too large, the range of the empty foil region is too large, which will cause the situation that the coated region does not have a corresponding coated region, and thus the energy density of the cell is reduced; on the contrary, if the length range of the uncoated zone is too small, the effect of reducing the risk of chipping cannot be satisfied, and therefore it is sufficient to keep the uncoated zone within this range.
Preferably, at the winding center of the winding battery cell, the head end of the first pole piece and the head end of the second pole piece form an opposite insertion type structure. The head end of first pole piece is relative and have the partial overlap setting with the head end of second pole piece promptly, and this kind is to inserting formula coiling and can show save material and promote the energy density of electric core.
Preferably, the tail end of the second pole piece further comprises a section of empty foil area to form an enclosure to enclose the second pole piece.
The beneficial effects of the utility model reside in that:
1) the utility model provides a coiling electricity core, include: the first pole piece comprises a first pole piece double-sided coating area; the second pole piece is opposite to the polarity of the first pole piece and comprises a second pole piece double-side coating area and a second pole piece single-side coating area; the second pole piece single-side coating area is arranged in a bending area when the second pole piece is wound, one side of the second pole piece single-side coating area, which is back to the winding center of the winding battery cell, is a coating area, and one side of the second pole piece single-side coating area, which is facing to the winding center of the winding battery cell, is an uncoated area; a diaphragm disposed between the first pole piece and the second pole piece. Compared with the prior art, the utility model discloses a single face coating district has been omitted to first pole piece, has avoided the diaphragm resistance that arouses by single face coating district and has corresponded the relative main part of impedance increase, lead to the condition of analysing the lithium risk, has improved life cycle and security performance. And the utility model discloses a second pole piece has included single face coating district, has set up the district of buckling when convoluteing and at the outside coating active material in the district of buckling with single face coating district for the second pole piece has guaranteed its active material at the roll-in-process and has not received under the condition damaged or destroyed, has promoted the compaction density of pole piece and has not aroused the broken piece risk that coiling formula electricity core department of buckling caused, thereby is showing and promotes energy density. The utility model discloses improve the lithium risk of analysing that the single face district of coiling electric core exists at present, when improving the compaction density of pole piece and do not make the pole piece appear the fragment risk, reached the purpose that promotes electric core energy density.
2) The utility model discloses a second pole piece single face coating district includes that first, second and third when convoluteing buckle the department and set up first single face coating district, second single face coating district and third single face coating district respectively, through the setting in cubic single face coating district, has guaranteed that the stability of second pole piece has promoted its compaction density simultaneously.
Drawings
Fig. 1 is one of the schematic structural diagrams of the present invention.
Fig. 2 is a second schematic structural diagram of the present invention.
In the figure: 1-a first pole piece; 11-a first pole piece double-sided coating area; 12-a first empty foil area; 13-a first tab; 2-a second pole piece; 21-a second pole piece single-side coating area; 211-a first single-coated area; 212-a second single-coated area; 213-a third single-sided coating zone; 22-second pole piece double-sided coating zone; 23-a second empty foil area; 24-a second tab; 3-a diaphragm.
Detailed Description
As shown in fig. 1 to 2, a winding battery cell includes:
the first pole piece 1 comprises a first pole piece double-sided coating area 11 and a first empty foil area 12 arranged at the tail end of the first pole piece 1, the first empty foil area 12 is connected with a first pole lug 13, the first pole lug 13 and the first empty foil area 12 are integrally formed or the first pole lug 13 is welded to the first empty foil area 12, and the first pole lug 13 is arranged in parallel to the width direction of the first pole piece 1; the first pole piece double-sided coating area 11 is formed by coating first active substances on the first current collector on two sides, and the projection surfaces of the active substances on the front side and the back side are consistent, namely, a staggered coating area does not exist;
a second pole piece 2, the polarity of the second pole piece 2 is opposite to that of the first pole piece 1, the second pole piece 2 comprises a second pole piece double-sided coating area 22, a second pole piece single-sided coating area 21 and a second empty foil area 23 which is arranged at the tail end of the second pole piece 2 and is opposite to the first empty foil area 12; the second pole piece single-side coating area 21 is arranged in a bending area when the second pole piece 2 is wound, the bending area comprises a bending part and two end extension areas close to the bending part, one side of the second pole piece single-side coating area 21, which is back to the winding center of the winding electric core, is a coating area, and one side of the second pole piece single-side coating area 21, which faces the winding center of the winding electric core, is an uncoated area; the second empty foil area 23 is connected with a second tab 24, the second tab 24 and the second empty foil area 23 are integrally formed or the second tab 24 is welded to the second empty foil area 23, and the second tab 24 is arranged in parallel to the width direction of the second pole piece 2; the second electrode plate double-side coating area 22 is formed by coating a second active material on the second current collector on two sides; the second diode single-sided coating region 21 includes a first single-sided coating region 211, a second single-sided coating region 212, and a third single-sided coating region 213; the lengths of uncoated areas of the first single-side coating area 211, the second single-side coating area 212 and the third single-side coating area 213 are all 2-8 mm, and preferably, the lengths of the uncoated areas are all 3-6 mm;
a separator 3 disposed between the first pole piece 1 and the second pole piece 2; then winding the first pole piece 1, the diaphragm 3 and the second pole piece 2 in sequence to form a flat battery core; in addition, the head end of the first pole piece 1 and the head end of the second pole piece 2 are in an opposite insertion type structure, so that the winding center of the winding battery cell forms an opposite insertion type structure; the end of the second pole piece 2 further comprises a section of empty foil to form an enclosure surrounding the second pole piece 2.
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantageous effects will be described in further detail below with reference to the accompanying drawings of the detailed description and the specification, but the present invention is not limited thereto.
Example 1
A wound cell, comprising:
the negative plate comprises a negative plate double-side coating area and a first empty foil area 12 arranged at the tail end of the negative plate, the first empty foil area 12 is connected with a negative electrode tab, the negative electrode tab and the first empty foil area 12 are integrally formed or the negative electrode tab is welded on the first empty foil area 12, and the negative electrode tab is arranged in parallel to the width direction of the negative plate; the negative plate double-side coating area is formed by coating negative active materials on the negative current collector on the two sides, the projection surfaces of the active materials on the front side and the back side are consistent, namely, the dislocation coating area does not exist, and the negative current collector can adopt copper foil;
the positive plate comprises a positive plate double-sided coating area, a positive plate single-sided coating area and a second empty foil area 23 which is arranged at the tail end of the positive plate and is opposite to the first empty foil area 12; the positive plate single-side coating area is arranged in a bending area when the positive plate is wound, the bending area comprises a bending part and two end extension areas close to the bending part, one side of the positive plate single-side coating area, which is back to the winding center of the winding electric core, is a coating area, and one side of the positive plate single-side coating area, which faces the winding center of the winding electric core, is an uncoated area, namely an empty foil area; the second empty foil area 23 is connected with a positive tab, the positive tab and the second empty foil area 23 are integrally formed or the positive tab is welded on the second empty foil area 23, and the positive tab is arranged in parallel to the width direction of the positive plate; the positive plate double-side coating area is formed by coating positive active substances on the positive current collector on the two sides; preferably, the single-side coating area of the positive plate comprises a first single-side coating area 211, a second single-side coating area 212 and a third single-side coating area 213, the lengths of uncoated areas of the first single-side coating area 211, the second single-side coating area 212 and the third single-side coating area 213 are all 2-8 mm, and preferably, the lengths of the uncoated areas are all 3-6 mm;
the diaphragm 3 is arranged between the positive plate and the negative plate; then winding according to the order of negative pole piece, diaphragm 3 and positive plate and forming the flat electric core, in addition, the head end of negative pole piece is to inserting formula structure with the head end of positive plate to make the winding center of coiling electric core form one kind to inserting formula structure; the tail end of the positive plate also comprises a section of empty foil area to form an enclosing ring to enclose the positive plate.
Example 2
A wound cell, comprising:
the positive plate comprises a positive plate double-sided coating area and a first empty foil area 12 arranged at the tail end of the positive plate, the first empty foil area 12 is connected with a positive tab, the positive tab and the first empty foil area 12 are integrally formed or the positive tab is welded on the first empty foil area 12, and the positive tab is arranged in parallel to the width direction of the positive plate; the positive plate double-side coating area is formed by coating negative active materials on the positive current collector on two sides, the projection surfaces of the active materials on the positive side and the negative side are consistent, namely, a staggered coating area does not exist, and the positive current collector can adopt aluminum foil;
the negative plate comprises a negative plate double-sided coating area, a negative plate single-sided coating area and a second empty foil area 23 which is arranged at the tail end of the negative plate and is opposite to the first empty foil area 12; the negative plate single-side coating area is arranged in a bending area when the negative plate is wound, the bending area comprises a bending part and two end extension areas close to the bending part, one side of the negative plate single-side coating area, which is back to the winding center of the winding electric core, is a coating area, and one side of the negative plate single-side coating area, which faces the winding center of the winding electric core, is an uncoated area, namely an empty foil area; the second empty foil area 23 is connected with a negative electrode tab, the negative electrode tab and the second empty foil area 23 are integrally formed or the negative electrode tab is welded on the second empty foil area 23, and the negative electrode tab is arranged in parallel to the width direction of the negative electrode plate; the negative plate double-side coating area is formed by coating negative active substances on the negative current collector on the two sides; preferably, the negative plate single-side coating area comprises a first single-side coating area 211, a second single-side coating area 212 and a third single-side coating area 213, the lengths of uncoated areas of the first single-side coating area 211, the second single-side coating area 212 and the third single-side coating area 213 are all 2-8 mm, and preferably, the lengths of the uncoated areas are all 3-6 mm;
the diaphragm 3 is arranged between the positive plate and the negative plate; then winding according to the order of negative pole piece, diaphragm 3 and positive plate and forming the flat electric core, in addition, the head end of negative pole piece is to inserting formula structure with the head end of positive plate to make the winding center of coiling electric core form one kind to inserting formula structure; the tail end of the negative plate also comprises a section of empty foil area to form an enclosure to enclose the negative plate.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A wound cell, comprising:
the first pole piece comprises a first pole piece double-sided coating area;
the second pole piece is opposite to the polarity of the first pole piece and comprises a second pole piece double-side coating area and a second pole piece single-side coating area; the second pole piece single-side coating area is arranged in a bending area when the second pole piece is wound, one side of the second pole piece single-side coating area, which is back to the winding center of the winding battery cell, is a coating area, and one side of the second pole piece single-side coating area, which is facing to the winding center of the winding battery cell, is an uncoated area;
a diaphragm disposed between the first pole piece and the second pole piece.
2. The wound cell of claim 1, wherein the first pole piece further comprises a first empty foil region disposed at an end of the first pole piece; the second pole piece further comprises a second empty foil area arranged at the tail end of the second pole piece, and the first empty foil area and the second empty foil area are arranged oppositely.
3. The wound cell of claim 2, wherein a first tab is connected to the first empty foil region and a second tab is connected to the second empty foil region.
4. The wound cell of claim 3, wherein the first tab is integrally formed with or welded to the first empty foil zone; the second tab and the second empty foil area are integrally formed or the second tab is welded to the second empty foil area.
5. The winding cell of claim 1, wherein the bend region comprises a bend and two end extensions adjacent to the bend.
6. The wound cell of claim 1, wherein the second pole piece single-side coated region comprises a first single-side coated region disposed at a first fold region of the second pole piece as it is wound.
7. The wound cell of claim 6, wherein the second pole piece single-side coated region further comprises a second single-side coated region disposed at a second fold region of the second pole piece as it is wound.
8. The wound cell of claim 7, wherein the second pole piece single-sided coating region further comprises a third single-sided coating region disposed at a third fold region of the second pole piece during winding.
9. The wound cell of claim 8, wherein the uncoated regions of the first, second and third single-coated regions are each 2-8 mm in length.
10. The wound cell of claim 1, wherein the first end of the first pole piece and the second pole piece form an interdigitated structure at the winding center of the wound cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922120867.1U CN210926204U (en) | 2019-12-02 | 2019-12-02 | Winding battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922120867.1U CN210926204U (en) | 2019-12-02 | 2019-12-02 | Winding battery cell |
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| Publication Number | Publication Date |
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| CN210926204U true CN210926204U (en) | 2020-07-03 |
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| CN201922120867.1U Active CN210926204U (en) | 2019-12-02 | 2019-12-02 | Winding battery cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122321A (en) * | 2021-11-25 | 2022-03-01 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
| WO2024120492A1 (en) * | 2022-12-08 | 2024-06-13 | 湖北亿纬动力有限公司 | Winding-type positive electrode sheet and preparation method therefor, and winding core |
-
2019
- 2019-12-02 CN CN201922120867.1U patent/CN210926204U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122321A (en) * | 2021-11-25 | 2022-03-01 | 珠海冠宇电池股份有限公司 | Battery with a battery cell |
| WO2024120492A1 (en) * | 2022-12-08 | 2024-06-13 | 湖北亿纬动力有限公司 | Winding-type positive electrode sheet and preparation method therefor, and winding core |
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