CN220672607U - Pole piece and winding type battery cell - Google Patents
Pole piece and winding type battery cell Download PDFInfo
- Publication number
- CN220672607U CN220672607U CN202322194817.4U CN202322194817U CN220672607U CN 220672607 U CN220672607 U CN 220672607U CN 202322194817 U CN202322194817 U CN 202322194817U CN 220672607 U CN220672607 U CN 220672607U
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- active material
- material layer
- pole piece
- area
- bending
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- 238000004804 winding Methods 0.000 title abstract description 14
- 239000011149 active material Substances 0.000 claims abstract description 87
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000005452 bending Methods 0.000 claims abstract description 39
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052744 lithium Inorganic materials 0.000 abstract description 12
- 230000002687 intercalation Effects 0.000 abstract description 6
- 238000009830 intercalation Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 71
- 238000001556 precipitation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000926 separation 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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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a pole piece and a winding type battery cell, which comprises the following components: the lithium ion battery comprises a current collector, a first coating area and a second coating area, wherein the first coating area is positioned on the first surface of the current collector, the second coating area is positioned on the second surface of the current collector, the first coating area comprises a first straight area and a first bending area, the first straight area, the first bending area and the second coating area are respectively coated with a first active material layer, the surface of the first active material layer of the first bending area is coated with a second active material layer, and the capability of the second active material layer for embedding lithium ions is higher than that of the first active material layer. Carry out the subregion to first coating district to scribble simultaneously in first bending zone and establish first active material layer and second active material layer, utilize the lithium intercalation ability of second active material layer to be stronger than the characteristic on first active material layer, make lithium ion intercalation efficiency promote, and then improved the lithium problem that separates that the pole piece appears in the use greatly, for the normal use of battery provides guarantee and promotes the battery quality.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a pole piece and a winding type battery cell.
Background
The wound battery is one of lithium ion batteries, and is widely used because of its advantages such as high energy density and small self-discharge. The wound battery is formed by sequentially stacking a positive electrode sheet, a separator and a negative electrode sheet and winding the stacked positive electrode sheet and the separator. The wound battery core has a bending part, and the bending part has small spacing between the pole pieces, so that lithium ions are difficult to insert, and further, the phenomenon of lithium precipitation is caused, thereby greatly influencing the normal use and quality of the battery.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a pole piece and a winding type battery cell.
The utility model discloses a pole piece, which comprises: the lithium ion battery comprises a current collector, a first coating area and a second coating area, wherein the first coating area is positioned on the first surface of the current collector, the second coating area is positioned on the second surface of the current collector, the first coating area comprises a first straight area and a first bending area, the first straight area, the first bending area and the second coating area are respectively coated with a first active material layer, the surface of the first active material layer of the first bending area is coated with a second active material layer, and the capability of the second active material layer for embedding lithium ions is higher than that of the first active material layer.
According to one embodiment of the utility model, the thickness of the first bending region is less than or equal to the thickness of the first straight region in the thickness direction of the pole piece.
According to one embodiment of the utility model, the thickness of the first bending zone is less than the thickness of the first flat zone in the thickness direction of the pole piece.
According to one embodiment of the present utility model, the first bending region has a thickness W 1 Thickness of the first flat regionIs W 2 ，W 2 -W 1 ＝5-20μm。
According to an embodiment of the present utility model, the number of the first flat regions and the first bending regions is at least two, and the first flat regions and the first bending regions are staggered.
According to an embodiment of the present utility model, the first active material layer is a graphite layer of high gram capacity.
According to an embodiment of the present utility model, the second active material layer is a fast-charging graphite layer.
According to an embodiment of the present utility model, the second coating region includes a second flat region and a second inflection region, the second flat region and the second inflection region are coated with the first active material layer, and the surface of the first active material layer of the second inflection region is further coated with the second active material layer; the second straight area is arranged corresponding to the first straight area, and the second bending area is arranged corresponding to the first bending area.
According to one embodiment of the utility model, the thickness of the second bending region is less than or equal to the thickness of the second straight region in the thickness direction of the pole piece.
The utility model discloses a winding type battery cell, which comprises: the pole piece, the first straight area is located at the straight section of the winding type battery cell, and the first bending area is located at the bending section of the winding type battery cell.
The utility model has the beneficial effects that: carry out the subregion to first coating district to scribble simultaneously in first bending zone and establish first active material layer and second active material layer, utilize the lithium intercalation ability of second active material layer to be stronger than the characteristic on first active material layer, make lithium ion intercalation efficiency promote, and then improved the lithium problem that separates that the pole piece appears in the use greatly, for the normal use of battery provides guarantee and promotes the battery quality.
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 application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is one of the schematic cross-sectional views of a pole piece in the length direction;
FIG. 2 is a schematic view of the use of a pole piece in a roll core;
FIG. 3 is a second schematic cross-sectional view of a pole piece in the length direction;
FIG. 4 is a schematic view of the use of another pole piece applied to a winding core;
FIG. 5 is a third schematic cross-sectional view of the pole piece in the length direction;
fig. 6 is a schematic cross-sectional view of a pole piece in the length direction.
Reference numerals illustrate:
1-a current collector; 11-a first surface; 12-a second surface;
2-a first coating zone; 21-a first flat zone; 22-a first inflection region;
3-a second coating zone; 31-a second straight region; 32-a second inflection region;
4-a first active material layer;
5-a second active material layer;
6-a positive plate;
7-membrane.
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 purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.
In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. 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.
Example 1
As shown in fig. 1-2, fig. 1 is one of the schematic cross-sectional views of a pole piece; fig. 2 is a schematic illustration of a pole piece usage scenario. The pole piece comprises a current collector 1, a first coating area 2, a second coating area 3, a first active material layer 4 and a second active material layer 5, wherein the current collector 1 is provided with a first surface 11 and a second surface 12 which are opposite, the first coating area 2 is positioned on the first surface 11 of the current collector 1, the second coating area 3 is positioned on the second surface 12 of the current collector 1, the first active material layer 4 is coated on the first coating area 2 and the second coating area 3, and the second active material layer 5 is coated on the first active material layer 4.
In a specific application, the first coating region 2 has a first flat region 21 and a first inflection region 22, the first flat region 21 and the first inflection region 22 are spliced, meanwhile, the first active material layer 4 is coated on the first flat region 21 and the first inflection region 22, the second active material layer 5 is coated on the first inflection region 22, and the second active material layer 5 is coated on the surface of the first active material layer 4 in the first inflection region 22 far away from the current collector 1. After the second active material layer 5 is coated, the second active material layer 5 of the first inflection region 22 is flush with the first active material layer 4 of the first flat region 21, that is, the thickness of the first active material layer 4 in the first inflection region 22 is smaller than the first active material layer 4 in the first flat region 21, and specifically, the sum of the thickness of the first active material layer 4 and the thickness of the second active material layer 5 in the first inflection region 22 is equal to the thickness of the first active material layer 4 in the first flat region 21. Specifically, the number of the first flat regions 21 and the number of the first inflection regions 22 are plural, and the first flat regions 21 and the first inflection regions 22 are staggered, that is, one first inflection region 22 is located between two first flat regions 21, and one first flat region 21 is located between two first inflection regions 22. It should be noted that, the first coating area 2 and the second coating area 3 are only shown as areas, and are not meant to be one coating layer coated with a coating, and in actual use, the coating of the first active material layer 4 and the second active material layer 5 in the first flat area 21 and the first bending area 22 can be achieved in one coating process by using the existing gap double-layer coating technology.
In this embodiment, the first active material layer 4 and the second active material layer 5 are both existing paints, but two paints having different lithium intercalation abilities need to be selected, and the condition that the lithium intercalation ability of the second active material layer 5 is stronger than that of the first active material layer 4 needs to be satisfied; in specific use, the first active material layer 4 is graphite with high gram capacity, and the purpose of the first active material layer is to improve the energy density of the pole piece; for example, a graphite material of model BFC-P of company Bei Terui is selected. The second active material layer 5 is made of quick-charge graphite, the microstructure of the quick-charge graphite has anisotropy, the obstruction of lithium ions in the charging and embedding process is reduced by virtue of a magnet wire, and the problem of lithium precipitation in the first bending region 22 of the pole piece in use is further improved by improving the effect of lithium ion embedding; for example, the PQ2 series products of the electric department of middle school are selected.
When the electrode plate is used, the electrode plate is used as a negative electrode plate, and is wound with the positive electrode plate and the diaphragm to form, after winding, one side of the electrode plate, which is provided with the first coating area 2, is used as an outer ring, and one side of the electrode plate, which is provided with the second coating area 3, is used as an inner ring, wherein the outer ring refers to the condition that the positive electrode plate wraps the electrode plate; the inner ring refers to the condition that the positive pole piece is wrapped by the pole piece; in the present embodiment, the second coating region 3 exists as an inner ring, which is only required to coat the first active material layer 4 without dividing the first inflection region 22 and coating the second active material layer 5 in the first inflection region 22.
Example two
As shown in fig. 3-4, fig. 3 is a second schematic cross-sectional view of the pole piece; fig. 4 is a schematic view of another pole piece usage scenario. The difference between this embodiment and the first embodiment is that: the thickness of the first inflection region 22 is smaller than that of the first straight region 21, i.e. the thickness of the first inflection region 22 is W 1 The first flat region 21 has a thickness W 2 ，W 1 ＜W 2 The method comprises the steps of carrying out a first treatment on the surface of the Further, W 2 -W 1 The first flat region 21 is higher than the first bending region 22 by 5-20 μm in the thickness direction by the interval range value of 5-20 μm, and the distance between the first bending region 22 and the positive electrode plate is increased by reducing the thickness of the first bending region 22, so that the obstruction of lithium ion movement is reduced, and the problem of lithium precipitation is improved.
Example III
As shown in FIG. 5, FIG. 5 is a third schematic cross-sectional view of the pole piece. The difference between this embodiment and the first embodiment is that: the second coating region 3 has a second flat region 31 and a second inflection region 32, the second flat region 31 is spliced with the second inflection region 32, the second flat region 31 is arranged corresponding to the first flat region 21, the second inflection region 32 is arranged corresponding to the first inflection region 22, meanwhile, the first active material layer 4 is coated on the second flat region 31 and the second inflection region 32, the second active material layer 5 is coated on the second inflection region 32, and the second active material layer 5 is coated on the surface of the first active material layer 4 away from the current collector 1 in the second inflection region 32. After the second active material layer 5 is coated, the second active material layer 5 of the second inflection region 32 is flush with the first active material layer 4 of the second flat region 31, that is, the thickness of the first active material layer 4 in the second inflection region 32 is smaller than the thickness of the first active material layer 4 in the second flat region 31, and specifically, the sum of the thickness of the first active material layer 4 and the thickness of the second active material layer 5 in the second inflection region 32 is equal to the thickness of the first active material layer 4 in the second flat region 31. Specifically, the number of the second flat regions 31 and the second inflection regions 32 is at least two, and the at least two second flat regions 31 and the at least two second inflection regions 32 are staggered, that is, one second inflection region 32 is located between the two second flat regions 31, and one second flat region 31 is located between the two second inflection regions 32. And the energy density is synchronously improved at the inner ring and the outer ring of the pole piece, and the lithium precipitation problem is improved.
Example IV
As shown in fig. 6, fig. 6 is a schematic cross-sectional view of a pole piece. The difference between this embodiment and the second embodiment is that: the second coating region 3 has a second flat region 31 and a second inflection region 32, the second flat region 31 is spliced with the second inflection region 32, the second flat region 31 is arranged corresponding to the first flat region 21, the second inflection region 32 is arranged corresponding to the first inflection region 22, meanwhile, the first active material layer 4 is coated on the second flat region 31 and the second inflection region 32, the second active material layer 5 is coated on the second inflection region 32, and the second active material layer 5 is coated on the surface of the first active material layer 4 away from the current collector 1 in the second inflection region 32. After the second active material layer 5 is coated, the second active material layer 5 of the second inflection region 32 is flush with the first active material layer 4 of the second flat region 31, that is, the thickness of the first active material layer 4 in the second inflection region 32 is smaller than the thickness of the first active material layer 4 in the second flat region 31, and specifically, the sum of the thickness of the first active material layer 4 and the thickness of the second active material layer 5 in the second inflection region 32 is equal to the thickness of the first active material layer 4 in the second flat region 31. Specifically, the number of the second flat regions 31 and the second inflection regions 32 is at least two, and the at least two second flat regions 31 and the at least two second inflection regions 32 are staggered, that is, one second inflection region 32 is located between the two second flat regions 31, and one second flat region 31 is located between the two second inflection regions 32. The lithium separation problem is further improved by synchronously increasing the distance between the inner ring and the outer ring of the pole piece.
Example five
The winding type battery cell comprises a positive electrode plate 6, a negative electrode plate and a diaphragm 7, wherein the negative electrode plate adopts the structure of the electrode plate in the first embodiment, the second embodiment, the third embodiment or the fourth embodiment; meanwhile, the coiled battery cell is provided with a straight section and a bending section, the first straight section 21 is positioned in the straight section, and the first bending section 22 is positioned in the bending section.
Example six
The battery comprises a winding type battery cell and a shell, wherein the winding type battery cell adopts the structure in the fifth embodiment.
Example seven
The battery pack of the present application includes a plurality of connected batteries, wherein the battery adopts the structure in embodiment six.
The foregoing description is only illustrative of the utility model and is not to be construed as limiting the 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 pole piece, comprising: the lithium ion battery comprises a current collector (1), a first coating area (2) and a second coating area (3), wherein the first coating area (2) is located on a first surface (11) of the current collector (1), the second coating area (3) is located on a second surface (12) of the current collector (1), the first coating area (2) comprises a first flat area (21) and a first bending area (22), the first flat area (21), the first bending area (22) and the second coating area (3) are respectively coated with a first active material layer (4), the surface of the first active material layer (4) of the first bending area (22) is coated with a second active material layer (5), and the capacity of embedding lithium ions of the second active material layer (5) is stronger than that of the first active material layer (4).
2. A pole piece according to claim 1, characterized in that the thickness of the first bending zone (22) in the thickness direction of the pole piece is smaller than or equal to the thickness of the first flat zone (21).
3. Pole piece according to claim 1, characterized in that in the pole piece thickness direction the thickness of the first bending zone (22) is < the thickness of the first flat zone (21).
4. A pole piece according to claim 3, characterized in that the thickness of the first bending zone (22) is W 1 The first flat region (21) has a thickness W 2 ，W 2 -W 1 ＝5μm-20μm。
5. Pole piece according to claim 2, characterized in that the number of the first flat areas (21) and the first bending areas (22) is at least two, and the first flat areas (21) and the first bending areas (22) are staggered.
6. Pole piece according to claim 1, characterized in that the first active material layer (4) is a graphite layer of high gram capacity.
7. Pole piece according to claim 6, characterized in that the second active material layer (5) is a fast-charging graphite layer.
8. Pole piece according to any of claims 1-7, characterized in that the second coating zone (3) comprises a second flat zone (31) and a second bent zone (32), the second flat zone (31) and the second bent zone (32) being coated with the first active material layer (4), respectively, the surface of the first active material layer (4) of the second bent zone (32) being further coated with the second active material layer (5); the second straight region (31) is arranged corresponding to the first straight region (21), and the second bending region (32) is arranged corresponding to the first bending region (22).
9. A pole piece according to claim 8, characterized in that the thickness of the second bending zone (32) in the thickness direction of the pole piece is smaller than or equal to the thickness of the second flat zone (31).
10. A coiled electrical cell, comprising: a pole piece according to any of claims 1-9, wherein the first straight region (21) is located in a straight section of the wound cell and the first bent region (22) is located in a bent section of the wound cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322194817.4U CN220672607U (en) | 2023-08-14 | 2023-08-14 | Pole piece and winding type battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322194817.4U CN220672607U (en) | 2023-08-14 | 2023-08-14 | Pole piece and winding type battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220672607U true CN220672607U (en) | 2024-03-26 |
Family
ID=90343791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322194817.4U Active CN220672607U (en) | 2023-08-14 | 2023-08-14 | Pole piece and winding type battery cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220672607U (en) |
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2023
- 2023-08-14 CN CN202322194817.4U patent/CN220672607U/en active Active
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