CN219457721U - Battery winding core, cylindrical battery, battery module and electricity utilization device - Google Patents
Battery winding core, cylindrical battery, battery module and electricity utilization device Download PDFInfo
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- CN219457721U CN219457721U CN202222529813.2U CN202222529813U CN219457721U CN 219457721 U CN219457721 U CN 219457721U CN 202222529813 U CN202222529813 U CN 202222529813U CN 219457721 U CN219457721 U CN 219457721U
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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 application relates to a battery winding core, a cylindrical battery, a battery module and an electric device, wherein the battery winding core, the cylindrical battery, the battery module and the electric device comprise a positive electrode current collector, a positive electrode coating area is arranged on two side surfaces of the positive electrode current collector, a positive electrode active substance is coated in the positive electrode coating area, a positive electrode uncoated area is arranged on the side edge of the positive electrode current collector, and a positive electrode vacancy area is formed by cutting the head end of the positive electrode uncoated area; the two side surfaces of the negative electrode current collector are both provided with a negative electrode coating region, a negative electrode active substance is coated in the negative electrode coating region, the side edge of the negative electrode current collector is provided with a negative electrode uncoated region, and the head end of the negative electrode uncoated region is cut to form a negative electrode vacancy region; the separator, the negative electrode current collector, the separator and the positive electrode current collector are sequentially stacked from outside to inside, the positive electrode coating area and the negative electrode coating area cover two sides of the separator respectively, and after the battery winding core is wound, the front end height of the positive electrode uncoated area and the negative electrode uncoated area, which are positioned at the axle center, is lower than the tail end height. The problem of poor folds can be avoided, so that the welding quality can be improved, and the product yield of the battery coil after the battery coil is wound is ensured.
Description
Technical Field
The utility model relates to the technical field of lithium ion power batteries, in particular to a battery winding core, a cylindrical battery, a battery module and an electric device.
Background
With the rapid development of the new energy automobile industry, the demand for the power battery is increased explosively, and meanwhile, higher requirements are also put forward for the service performance of the power battery. For example, for a cylindrical battery, the conventional cylindrical battery is designed with a positive electrode tab and a negative electrode tab so as to be connected with the positive electrode and the negative electrode of the housing, but when the cylindrical battery with the positive electrode tab and the negative electrode tab is charged and discharged, the transverse movement path of electrons is long, the internal resistance can be inevitably increased, the energy of the battery can be lost, and the heating value can be increased, so that the use safety and reliability of the cylindrical battery are affected.
Aiming at the defects of the cylindrical battery with the electrode lugs, the cylindrical battery with the electrode lugs is introduced in the market in recent years, but the manufacturing process of the winding core of the cylindrical battery with the electrode lugs is not mature, the problem of poor pole piece wrinkling in the axial center area after the winding core is wound is serious, and the poor welding quality of the current collector and the positive electrode current collector can be caused, so that the processing quality and the yield of the cylindrical battery with the electrode lugs are greatly influenced.
Disclosure of Invention
Based on the above, it is necessary to provide a battery winding core, a cylindrical battery, a battery module and an electric device, which solve the problems of poor pole piece wrinkles and poor welding quality.
A battery winding core, comprising:
the positive electrode current collector is characterized in that positive electrode coating areas are formed on two side surfaces of the positive electrode current collector, positive electrode active substances are coated in the positive electrode coating areas, a positive electrode uncoated area is formed on the side edge of the positive electrode current collector, and a positive electrode vacancy area is formed by cutting the head end of the positive electrode uncoated area;
the negative electrode current collector is characterized in that negative electrode coating areas are formed on two side surfaces of the negative electrode current collector, negative electrode active substances are coated in the negative electrode coating areas, negative electrode uncoated areas are formed on the side edges of the negative electrode current collector, and negative electrode vacancy areas are formed by cutting the head ends of the negative electrode uncoated areas; and
the separator, the negative electrode current collector, the separator and the positive electrode current collector are sequentially stacked from outside to inside, the positive electrode coating area and the negative electrode coating area cover the two sides of the separator respectively, and after the battery winding core is wound, the head end height of the positive electrode uncoated area and the negative electrode uncoated area, which are positioned at the axle center, is lower than the tail end height.
In one embodiment, the positive electrode uncoated region and the negative electrode uncoated region are located at opposite ends of the separator in the width direction, respectively.
In one embodiment, both sides in the height direction or the width direction of the separator exceed the sides of the positive electrode coating region and the negative electrode coating region.
In one embodiment, the head end of the positive electrode uncoated region is cut to form a first kerf; the head end of the negative electrode uncoated region is cut to form a second kerf.
In one embodiment, the positive electrode uncoated region is cut to form a plurality of first notches, and the first notches are arranged at intervals along the length extension direction of the positive electrode uncoated region; the widths X1, X2, X3, X4 to Xy of the first gaps are not equal;
the negative electrode uncoated region is cut to form a plurality of second gaps, and the second gaps are arranged at intervals along the length extending direction of the negative electrode uncoated region; the widths Y1, Y2, Y3, Y4 to Yx of the second notches are not equal.
In one embodiment, the positive uncoated region and the negative uncoated region are pre-bent prior to winding the battery winding core;
the bending direction is bending in the central hole of the battery winding core or bending outside the central hole of the battery winding core, and the bending angle range is more than 0 degrees and less than 90 degrees.
In one embodiment, the positive uncoated region and the negative uncoated region are each formed in a 360 ° spiral structure after the winding of the battery core is completed.
A cylindrical battery comprising a battery cell as described above.
A battery module comprises a plurality of cylindrical batteries, wherein the plurality of cylindrical batteries are arranged in an array structure and are connected in parallel or in series.
An electric device comprises the battery module.
The beneficial effects of the technical scheme are as follows:
the two sides of the positive electrode current collector are both provided with positive electrode coating areas, positive electrode active substances are coated in the positive electrode coating areas, the side edges of the positive electrode current collector are provided with positive electrode uncoated areas, and the head ends of the positive electrode uncoated areas are cut to form positive electrode vacancy areas; the two side surfaces of the negative electrode current collector are both provided with a negative electrode coating region, a negative electrode active substance is coated in the negative electrode coating region, the side edge of the negative electrode current collector is provided with a negative electrode uncoated region, and the head end of the negative electrode uncoated region is cut to form a negative electrode vacancy region; the separator is laminated between the positive current collector and the negative current collector, the positive coating area and the negative coating area cover the two sides of the separator respectively, and after the battery winding core is wound, the head end height of the positive uncoated area and the negative uncoated area, which are positioned at the axle center, is lower than the tail end height. That is, the positive electrode uncoated area (serving as a positive electrode tab) and the negative electrode uncoated area (serving as a negative electrode tab) are bent inwards because of sufficient space in the positive electrode vacancy area and the negative electrode vacancy area, and the inner and outer multilayer winding structures are bent and attached orderly and tightly, so that the problem of poor wrinkles can be avoided, the welding quality can be improved, and the product yield of the battery after winding the battery winding core is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a partially rolled structure of a battery core of the present application;
FIG. 2 is an exploded view of the battery core of FIG. 1;
FIG. 3 is a schematic view of an expanded planar structure of a positive current collector;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a schematic view of another embodiment of the battery core of FIG. 1;
FIG. 6 is a schematic view of a structure in which a plurality of first notches have unequal widths;
FIG. 7 is a schematic view of a structure in which the second notches have different widths;
fig. 8 is a schematic structural view of the positive electrode uncoated region and the negative electrode uncoated region bent into the central hole;
fig. 9 is a schematic structural view of the positive electrode uncoated region and the negative electrode uncoated region bent outward of the central hole.
Reference numerals illustrate:
100. a battery winding core; 10. a positive electrode current collector; 11. a positive electrode coating region; 12. a positive electrode uncoated region; 121. a first notch; 13. a positive electrode vacancy region; 20. a negative electrode current collector; 21. a negative electrode coating region; 22. a negative electrode uncoated region; 221. a second notch; 23. a negative electrode vacancy region; 30. a diaphragm.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 4, a battery winding core 100 according to an embodiment includes: the positive electrode current collector 10, the two sides of the positive electrode current collector 10 are respectively provided with a positive electrode coating area 11, a positive electrode active substance is coated in the positive electrode coating areas 11, the side edge of the positive electrode current collector 10 is provided with a positive electrode uncoated area 12, and the head end of the positive electrode uncoated area 12 is cut to form a positive electrode vacancy area 13; the negative electrode current collector 20, the both sides of the negative electrode current collector 20 are provided with a negative electrode coating area 21, a negative electrode active substance is coated in the negative electrode coating area 21, the side edge of the negative electrode current collector 20 is provided with a negative electrode uncoated area 22, and the head end of the negative electrode uncoated area 22 is cut to form a negative electrode vacancy area 23; and a separator 30, wherein the separator 30, the negative electrode current collector 20, the separator 30 and the positive electrode current collector 10 are sequentially stacked from outside to inside, the positive electrode coating region 11 and the negative electrode coating region 21 respectively cover two sides of the separator 30, and after the battery winding core 100 is wound, the front end height of the positive electrode uncoated region 12 and the negative electrode uncoated region 22, which are positioned at the axle center, is lower than the tail end height.
The beneficial effects of the technical scheme are as follows: the two side surfaces of the positive current collector 10 are respectively provided with a positive electrode coating area 11, positive electrode active substances are coated in the positive electrode coating areas 11, the side edges of the positive current collector 10 are provided with positive electrode uncoated areas 12, and the head ends of the positive electrode uncoated areas 12 are cut to form positive electrode vacancy areas 13; the two sides of the negative electrode current collector 20 are respectively provided with a negative electrode coating area 21, a negative electrode active substance is coated in the negative electrode coating areas 21, the side edge of the negative electrode current collector 20 is provided with a negative electrode uncoated area 22, and the head end of the negative electrode uncoated area 22 is cut to form a negative electrode vacancy area 23; the separator 30 is stacked between the positive electrode current collector 10 and the negative electrode current collector 20, the positive electrode coating region 11 and the negative electrode coating region 21 cover two sides of the separator 30 respectively, and after the battery winding core 100 is wound, the front end height of the positive electrode uncoated region 12 and the negative electrode uncoated region 22 at the axle center is lower than the tail end height. That is, the positive electrode uncoated region 12 (serving as a positive electrode tab) and the negative electrode uncoated region 22 (serving as a negative electrode tab) have sufficient space to bend inwards due to the existence of the positive electrode vacancy region 13 and the negative electrode vacancy region 23, and the inner and outer multi-layer winding structures are orderly and tightly bent and bonded, so that the problem of poor wrinkles can be avoided, the welding quality can be improved, and the product yield of the wound battery core 100 is ensured.
In one embodiment, the positive electrode uncoated region 12 and the negative electrode uncoated region 22 are located at opposite ends of the separator 30 in the width direction, respectively. Therefore, after the battery winding core 100 is wound, the anode uncoated area 12 and the cathode uncoated area 22 can be overlapped to form an anode and a cathode, so that the anode and the cathode are welded and connected with the connecting piece of the shell, and the internal circuit of the cylindrical battery is completed.
Further, both sides in the height direction or the width direction of the separator 30 are beyond the side edges of the positive electrode coating region 11 and the negative electrode coating region 21. This ensures that the separator 30 can complete a completely reliable separation of the positive electrode active material in the positive electrode coating region 11 from the negative electrode active material in the negative electrode coating region 21 on both sides.
Referring to fig. 2 and 3, in a manufacturing scheme of a winding core, a first slit is required to be cut at the head end of the positive electrode uncoated region 12 before winding; the head end of the negative uncoated region 22 is cut to form a second slit. The first and second slits help to bend and gather the positive and negative uncoated regions 12 and 22 in the axial direction in a space required for the positive and negative uncoated regions to fit tightly, fold in order, and have a small gap.
With continued reference to fig. 5 to 9, in another embodiment of the manufacturing method of the winding core, the positive electrode uncoated area 12 is cut to form a plurality of first notches 121, and the plurality of first notches 121 are arranged at intervals along the length extension direction of the positive electrode uncoated area 12; the widths X1, X2, X3, X4 to Xy of the respective first notches 121 are not equal. The cathode uncoated region 22 is cut to form a plurality of second notches 221, and the plurality of second notches 221 are arranged at intervals along the length extending direction of the cathode uncoated region 22; the widths Y1, Y2, Y3, Y4 to Yx of the respective second notches 221 are not equal. When the battery winding core 100 is wound and folded, the first notch 121 and the second notch 221 can provide a space required for bending and gathering the positive electrode uncoated region 12 and the negative electrode uncoated region 22 towards the axial direction, ensure compact lamination, are orderly folded, have small gaps, and facilitate subsequent welding processing. In addition, the widths of the first notch 121 and the second notch 221 are not equal, so that different widths can be cut according to the process, the later welding position can be greatly adapted, and the welding position can be changed at any time.
Preferably, the positive electrode uncoated region 12 and the negative electrode uncoated region 22 are pre-bent in the axial direction before the battery winding core 100 is wound. The negative uncoated region 22 is pre-bent before the battery core 100 is wound; the bending direction is bending in the central hole of the battery winding core or bending outside the central hole of the battery winding core, and the bending angle range is more than 0 degrees and less than 90 degrees. This reduces the difficulty in processing the tabs formed by the positive electrode uncoated region 12 and the negative electrode uncoated region 22 of each winding layer after winding to finally bend and contact. After the winding of the battery core is completed, the positive electrode uncoated region 12 and the negative electrode uncoated region 22 are each formed in a 360 ° spiral structure. The structural arrangement is more beneficial to secondary bending and leveling in the follow-up process, and improves welding quality.
In summary, the present application further discloses an electric device, which includes a battery module. The battery module comprises a plurality of cylindrical batteries which are arranged in an array structure and are connected in parallel or in series. The cylindrical battery includes a case and a battery pack 100, and the battery pack 100 is mounted in the case.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A battery roll core, comprising:
the positive electrode current collector is characterized in that positive electrode coating areas are formed on two side surfaces of the positive electrode current collector, positive electrode active substances are coated in the positive electrode coating areas, a positive electrode uncoated area is formed on the side edge of the positive electrode current collector, and a positive electrode vacancy area is formed by cutting the head end of the positive electrode uncoated area;
the negative electrode current collector is characterized in that negative electrode coating areas are formed on two side surfaces of the negative electrode current collector, negative electrode active substances are coated in the negative electrode coating areas, negative electrode uncoated areas are formed on the side edges of the negative electrode current collector, and negative electrode vacancy areas are formed by cutting the head ends of the negative electrode uncoated areas; and
the separator, the negative electrode current collector, the separator and the positive electrode current collector are sequentially stacked from outside to inside, the positive electrode coating area and the negative electrode coating area cover the two sides of the separator respectively, and after the battery winding core is wound, the head end height of the positive electrode uncoated area and the negative electrode uncoated area, which are positioned at the axle center, is lower than the tail end height.
2. The battery winding core according to claim 1, wherein the positive electrode uncoated region and the negative electrode uncoated region are located at opposite ends of the separator in the width direction, respectively.
3. The battery winding core according to claim 1, wherein both sides in a height direction or a width direction of the separator exceed sides of the positive electrode coating region and the negative electrode coating region.
4. The battery winding core of claim 1, wherein a head end of the positive uncoated region is cut to form a first slit; the head end of the negative electrode uncoated region is cut to form a second kerf.
5. The battery winding core according to claim 1, wherein the positive electrode uncoated region is cut to form a plurality of first notches, and the plurality of first notches are arranged at intervals along the length extension direction of the positive electrode uncoated region; the widths X1, X2, X3, X4 to Xy of the first gaps are not equal;
the negative electrode uncoated region is cut to form a plurality of second gaps, and the second gaps are arranged at intervals along the length extending direction of the negative electrode uncoated region; the widths Y1, Y2, Y3, Y4 to Yx of the second notches are not equal.
6. The battery winding of claim 1, wherein the positive uncoated region and the negative uncoated region are pre-bent prior to winding the battery winding;
the bending direction is bending in the central hole of the battery winding core or bending outside the central hole of the battery winding core, and the bending angle range is more than 0 degrees and less than 90 degrees.
7. The battery winding core of claim 6, wherein the positive uncoated region and the negative uncoated region are each formed in a 360 ° spiral structure after the battery winding core is wound.
8. A cylindrical battery comprising a battery core as claimed in any one of claims 1 to 7.
9. A battery module comprising a plurality of cylindrical batteries according to claim 8, wherein the plurality of cylindrical batteries are arranged in an array configuration and are connected in parallel or series with each other.
10. An electrical device comprising a battery module according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222529813.2U CN219457721U (en) | 2022-09-23 | 2022-09-23 | Battery winding core, cylindrical battery, battery module and electricity utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222529813.2U CN219457721U (en) | 2022-09-23 | 2022-09-23 | Battery winding core, cylindrical battery, battery module and electricity utilization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219457721U true CN219457721U (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222529813.2U Active CN219457721U (en) | 2022-09-23 | 2022-09-23 | Battery winding core, cylindrical battery, battery module and electricity utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219457721U (en) |
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- 2022-09-23 CN CN202222529813.2U patent/CN219457721U/en active Active
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