CN221041215U - Composite coiled battery core - Google Patents
Composite coiled battery core Download PDFInfo
- Publication number
- CN221041215U CN221041215U CN202322613342.8U CN202322613342U CN221041215U CN 221041215 U CN221041215 U CN 221041215U CN 202322613342 U CN202322613342 U CN 202322613342U CN 221041215 U CN221041215 U CN 221041215U
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- China
- Prior art keywords
- battery
- core
- cell
- winding
- inner core
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 66
- 238000003475 lamination Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000008595 infiltration Effects 0.000 abstract description 7
- 238000001764 infiltration Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 206010017472 Fumbling Diseases 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
-
- 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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- Secondary Cells (AREA)
Abstract
The application belongs to the field of lithium battery manufacturing, and provides a composite coiled battery cell, which comprises: a battery inner core, a battery outer core and a tab; the battery outer core is of a winding core structure and is wound on the battery inner core, the battery inner core is of a lamination structure, lamination sheets are transversely arranged at equal width relative to the battery outer core, and the battery inner core and the battery outer core are composed of an anode, a diaphragm and a cathode; the battery inner core is provided with a plurality of tabs along a first direction, the battery outer core is provided with a plurality of tabs along a second direction, and the first direction is different from the second direction. The lamination of the battery inner core is wrapped in the battery outer core winding core to be transversely arranged, so that the occurrence of expansion of the winding core can be restrained, and the failure rate of the battery is effectively reduced. Meanwhile, the arrangement directions of the battery inner core lamination and the battery outer core winding core are different, the tightness degree of the winding core can be automatically adjusted in the liquid injection process, electrolyte infiltration defect caused by over-loosening or over-tightening of winding core is avoided, and further the performance of the battery core is improved.
Description
Technical Field
The application belongs to the field of lithium battery manufacturing, and particularly relates to a composite coiled battery cell.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the application and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
With the rapid development of the global electric automobile industry, high requirements are put on the ultra-long-endurance power battery, which means that the battery needs to have higher energy density and capacity, and the design and process of the battery are put on higher requirements. The current winding process has the condition that the R angle of the innermost 1 layer or a plurality of layers of pole pieces is small, and the problem that the innermost 1 layer or a plurality of layers of pole pieces are damaged frequently when the winding core is subjected to blanking, pressing and shaping. In order to reduce the damage proportion of the pole pieces at the inner layer of the winding core, the pressing and shaping pressure of the winding core can be reduced, but the problem cannot be thoroughly solved, and the material characteristics and the compaction density of the incoming material of the pole winding can greatly influence the winding core. Through dismantling the good battery, it is found that the damaged battery core of the internal pole piece flows out in a certain proportion, and the damaged battery core is difficult to detect and find, so that the quality of the battery is easily reduced, the customer satisfaction is reduced, and even customer complaints, complaints and the like are caused.
In addition, the electrolyte is often poorly infiltrated during the cell winding process. When the winding is loose, the pores between the anode material and the separator are larger, and too much electrolyte is accumulated, so that the uneven distribution of the electrolyte affects the performance of the battery. When the winding is tighter, the wetting speed and efficiency of the electrolyte are affected. Thereby causing the phenomenon that the performance of the battery cell is difficult to fully exert.
Therefore, a battery cell capable of solving the problems of poor electrolyte infiltration and too small R angle of the inner pole piece in the winding process is urgently needed in the industry.
Disclosure of utility model
In order to solve the problems, the application provides a composite coiled battery cell, which aims to solve the problems of poor electrolyte infiltration and over-small R angle of an inner pole piece in a coiling process. After the preparation of the winding core of the battery outer core is completed, a blanking clamping needle of a winding machine outwards props the winding core to flow out of a gap, then the prepared lamination pole group of the battery inner core is plugged into the gap, the positive pole and the negative pole of the battery outer core are connected with the positive pole and the negative pole of the battery inner core through pole lugs, and the lamination and winding core combined power battery pole group is successfully prepared.
In order to achieve the above purpose, the present application adopts the following technical scheme:
In a first aspect of the present application, there is provided a composite rolled cell comprising: a battery inner core, a battery outer core and a tab; the battery outer core is of a winding core structure and is wound on the battery inner core, the battery inner core is of a lamination structure, lamination sheets are transversely arranged at equal width relative to the battery outer core, and the battery inner core and the battery outer core are composed of an anode, a diaphragm and a cathode; the battery inner core is provided with a plurality of tabs along a first direction, the battery outer core is provided with a plurality of tabs along a second direction, and the first direction is different from the second direction.
The composite winding battery core can increase the R angle size of the pole piece in the winding core and solve the problem of pole piece breakage and material dropping caused by the too small R angle in the inner layer of the winding core. In addition, the lamination is filled in the gap of the coil core, so that the energy density of the battery core can be increased, and the space of the battery core is fully utilized.
Preferably, in the battery inner core, the width of the lamination is 10 mm-30 mm. The lamination is transversely arranged in the winding core, and in the use process of the battery, the lamination expands and is transversely unfolded, so that the expansion of the winding core can be restrained. In addition, the winding cores and the lamination are arranged in different directions, so that the tightness degree of the winding cores can be automatically adjusted in the liquid injection process, the wettability of electrolyte is improved, and the capacity loss caused by poor infiltration is reduced.
Preferably, the first direction is perpendicular to the second direction, so that the connection between the tab and the shell is facilitated, and the installation requirement of a specific scene is met.
Preferably, the electric core is located inside the battery shell, the positive electrode lugs of the battery outer core and the battery inner core are electrically connected with the positive electrode leading-out end of the battery shell through conductive connecting pieces, and the battery outer core and the negative electrode lugs of the battery inner core are electrically connected with the negative electrode leading-out end of the battery shell through conductive connecting pieces so as to form the composite power battery pole group.
Preferably, in the battery outer core and the battery inner core, each layer of positive plate is connected with one positive electrode tab, and each layer of negative plate is connected with one negative electrode tab. So that the outer core and the inner core of the battery are in electrical contact with the external element, and the transmission efficiency is improved.
Preferably, at least one layer of diaphragm is arranged between the positive electrode and the negative electrode, so that the stability of the battery is improved through the adjustment of the number of diaphragm layers.
Preferably, the battery outer core is formed by winding a battery outer core positive plate, a battery outer core diaphragm and a battery outer core negative plate.
Preferably, the battery inner core is formed by stacking a battery inner core positive plate, a battery inner core diaphragm and a battery inner core negative plate.
Preferably, the length of the laminate sheet is the same as the width of the cell outer core.
The beneficial effects of the application are that
(1) According to the application, the inner lamination of the battery inner core is transversely arranged by controlling, and the lamination is plugged into the core winding gap of the battery outer core to form a lamination and core winding composite structure, so that the R angle at two ends of the core winding is enlarged, the space of the R angle can be utilized as much as possible, the energy density is improved, and the problem of pole piece breakage and material dropping caused by too small R angle in the inner layer of the core winding is solved.
(2) The lamination of the battery inner core is wrapped in the battery outer core winding core to be transversely arranged, so that the occurrence of expansion of the winding core can be restrained, and the failure rate of the battery is effectively reduced. Meanwhile, the arrangement directions of the battery inner core lamination and the battery outer core winding core are different, the tightness degree of the winding core can be automatically adjusted in the liquid injection process, electrolyte infiltration defect caused by over-loosening or over-tightening of winding core is avoided, and further the performance of the battery core is improved.
In summary, the composite winding structure is used for a power battery, and compared with the prior art, the composite winding structure can promote the infiltration of electrolyte, inhibit the expansion of a winding core and promote the energy density and the safety performance of the battery core.
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.
Fig. 1 is a schematic diagram of the internal structure of a composite winding cell according to the present application, wherein: 1. the battery outer core diaphragm, the battery outer core negative electrode plate, the battery outer core positive electrode plate, the battery inner core diaphragm, the battery inner core negative electrode plate and the battery inner core positive electrode plate are respectively arranged in the battery outer core diaphragm, the battery outer core negative electrode plate and the battery inner core positive electrode plate respectively;
Fig. 2 is a perspective view of a composite winding and stacking cell according to the present application, wherein: 7. the battery inner core lamination, 8, the battery outer core winding core, 9, the battery inner core tab, 10, the battery outer core tab;
Fig. 3 is a side view of a composite rolled cell of the present application, wherein: 9-1, 9-2, 10-1, 10-2, and the battery inner core anode tab.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Interpretation of the terms
In the application, the lamination is transversely arranged relative to the battery outer core, which means that: each lamination is arranged in turn perpendicular to the longer center line in the cell outer core.
The application will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
As shown in fig. 1 and 2, the application provides a composite winding and folding electric core, which is positioned in a battery shell and is respectively connected with an anode lead-out end and a cathode lead-out end of the battery shell through conductive connecting pieces, wherein the electric core mainly comprises a battery inner core and a battery outer core; the battery inner core is of a lamination structure, the outer core of the battery is of a winding core structure 8 and is wound on the battery inner core, and the battery inner core is formed by sequentially laminating and placing a battery inner core positive plate 6, a battery inner core diaphragm 4 and a battery inner core negative plate 5. The battery outer core is formed by sequentially winding and placing a battery outer core positive plate 3, a battery outer core diaphragm 1 and a battery outer core negative plate 2.
As shown in fig. 3, the battery inner core is in a lamination structure, and the lamination 7 is transversely arranged at equal width relative to the battery outer core.
Each layer of positive plate 3 of the battery outer core is connected with a positive lug 10-1 of the battery outer core; each layer of negative electrode plate 2 of the battery outer core is connected with a negative electrode tab 10-2 of the battery outer core; each layer of positive plate 6 of the battery inner core is connected with a positive lug 9-1 of the battery inner core; each layer of negative electrode plate 5 of the battery inner core is connected with a negative electrode lug 9-2 of the battery inner core; the battery outer core and the battery inner core positive electrode lug are connected with the battery shell positive electrode leading-out end through a conductive connecting piece; the battery outer core and the battery inner core negative electrode tab are connected with the battery shell negative electrode leading-out end through the conductive connecting piece.
The application makes a fumbling on the length of L to save raw materials as much as possible while suppressing the expansion of the winding core and improving the wettability of the electrolyte. The results show that: l is more than or equal to 10mm and less than or equal to 30mm, and the expected effects of inhibiting the expansion of the winding core and improving the wettability of the electrolyte can be obtained.
The composite winding battery core can increase the R angle size of the pole piece in the winding core and solve the problem of pole piece breakage and material dropping caused by the too small R angle in the inner layer of the winding core. In addition, the lamination is filled in the gap of the coil core, so that the energy density of the battery core can be increased, and the space of the battery core is fully utilized.
The lamination is transversely arranged in the winding core at equal width, and in the using process of the battery, the lamination expands and is transversely unfolded, so that the expansion of the winding core can be restrained. In addition, the winding cores and the lamination are arranged in different directions, so that the tightness degree of the winding cores can be automatically adjusted in the liquid injection process, the wettability of electrolyte is improved, and the capacity loss caused by poor infiltration is reduced.
The preparation method comprises the following steps:
1) According to the method, as shown in fig. 1, corresponding positive and negative pole pieces are cut, the width of each negative pole piece is L, the width of each positive pole piece is L-1, the length of each positive and negative pole piece is consistent with the width of the outer winding core, a lamination machine is used for preparing a lamination pole group, and the thickness of a lamination is consistent with the requirement of an assembled battery.
2) The winding core is normally wound, a blanking winding needle of the winding machine outwards expands the hollow winding core during blanking to form a gap with the diameter slightly larger than L, and the laminated pole groups are transversely arranged and plugged into the gap in the middle of the winding core by the aid of the guide device to form the composite winding pole group, as shown in fig. 2.
3) The composite laminated pole group is connected with the winding core through the positive pole lug and the negative pole lug, as shown in figure 3, and becomes a complete winding pole group.
Wherein: l is more than or equal to 10mm and less than or equal to 30mm.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A composite rolled cell, comprising: a battery inner core, a battery outer core and a tab; the battery outer core is of a winding core structure and is wound on the battery inner core, the battery inner core is of a lamination structure, lamination sheets are transversely arranged at equal width relative to the battery outer core, and the battery inner core and the battery outer core are composed of an anode, a diaphragm and a cathode; the battery inner core is provided with a plurality of tabs along a first direction, the battery outer core is provided with a plurality of tabs along a second direction, and the first direction is different from the second direction.
2. The composite rolled cell of claim 1, wherein the laminate sheet has a width of 10mm to 30mm in the cell core.
3. The composite roll-up cell of claim 1, wherein the first direction is perpendicular to the second direction.
4. The composite rolled battery cell of claim 1, wherein the battery cell is positioned inside a battery housing, positive tabs of the battery outer core and the battery inner core are electrically connected to a positive lead-out terminal of the battery housing via conductive connectors, and negative tabs of the battery outer core and the battery inner core are electrically connected to a negative lead-out terminal of the battery housing via conductive connectors.
5. The composite rolled cell of claim 1, wherein each layer of positive electrode tab is connected to one positive electrode tab in the outer cell and the inner cell.
6. The composite rolled cell of claim 1, wherein each layer of negative electrode tab is connected to one negative electrode tab in the outer cell and the inner cell.
7. The composite rolled cell of claim 1, wherein at least one separator is disposed between the positive electrode and the negative electrode.
8. The composite rolled cell of claim 1, wherein the outer cell is formed by rolling an outer cell positive plate, an outer cell separator, and an outer cell negative plate.
9. The composite rolled battery cell of claim 1, wherein the battery core is formed by stacking a battery core positive electrode sheet, a battery core separator, and a battery core negative electrode sheet.
10. The composite rolled cell of claim 1, wherein the length of the laminate sheet is the same as the cell outer width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322613342.8U CN221041215U (en) | 2023-09-25 | 2023-09-25 | Composite coiled battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322613342.8U CN221041215U (en) | 2023-09-25 | 2023-09-25 | Composite coiled battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221041215U true CN221041215U (en) | 2024-05-28 |
Family
ID=91135341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322613342.8U Active CN221041215U (en) | 2023-09-25 | 2023-09-25 | Composite coiled battery core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221041215U (en) |
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2023
- 2023-09-25 CN CN202322613342.8U patent/CN221041215U/en active Active
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