CN219800974U - Bare cell and battery - Google Patents
Bare cell and battery Download PDFInfo
- Publication number
- CN219800974U CN219800974U CN202321031712.0U CN202321031712U CN219800974U CN 219800974 U CN219800974 U CN 219800974U CN 202321031712 U CN202321031712 U CN 202321031712U CN 219800974 U CN219800974 U CN 219800974U
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- Prior art keywords
- bare cell
- holes
- hole
- plate
- diameter
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- 230000004888 barrier function Effects 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 8
- 230000008595 infiltration Effects 0.000 abstract description 8
- 238000001764 infiltration Methods 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- Secondary Cells (AREA)
Abstract
The utility model discloses a bare cell and a battery, wherein the bare cell is formed by laminating an isolating film, a positive plate and a negative plate, through holes are formed in the isolating film, the positive plate and the negative plate, and the through holes are at least partially overlapped in the direction perpendicular to the plane of the through holes. The bare cell provided by the utility model has the advantages that electrolyte can enter the cell through the through holes on the isolating film, the positive plate and the negative plate, so that the circulation performance of the cell is improved, and the electrolyte infiltration effect is improved.
Description
Technical Field
The utility model belongs to the technical field of battery manufacturing, and particularly relates to a bare cell and a battery.
Background
The power battery is used as a core part of a new energy automobile (namely an electric automobile), and the structural safety performance and the thermal management performance of the power battery are very important. The outer ring isolating film prevents electrolyte from infiltrating the pole pieces and the isolating film from the two sides of the bare cell, so that the infiltration channel for the electrolyte to enter the bare cell is reduced, the electrolyte cannot infiltrate the pole pieces sufficiently, and the performance of the cell is affected.
In order to improve the infiltration effect of the electrolyte on the pole piece, the prior method comprises the following steps: the patent CN106848187A discloses a method for improving the liquid absorption speed and the liquid absorption amount of a lithium ion battery pole piece, and the method adopts a continuous vacuum standing or intermittent vacuum standing method, so that the liquid absorption amount and the liquid absorption speed of the lithium ion battery pole piece can be improved, and the soaking time is shortened. However, the method is that the vacuum is pumped after the liquid is injected, the electrolyte is easily pumped out, and the packaging bag is polluted, so that the appearance is bad. As another example, patent CN 105470445a discloses a method for improving the wettability of the pole piece of the lithium ion battery, the method is to spray a layer of anti-sticking coating on the rolling roller, and the surface roughness of the pole piece after rolling is improved, so as to improve the wettability of the pole piece of the lithium ion battery. However, the pole piece prepared by the method has large surface roughness, the flatness is difficult to meet the requirement, and appearance quality is easy to be damaged.
In view of the above, it is necessary to provide a novel bare cell and a novel battery for improving the wetting effect of the electrolyte on the electrode sheet.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a bare cell and a battery. The bare cell provided by the utility model has the advantages that electrolyte can enter the cell through the through holes on the isolating film, the positive plate and the negative plate, so that the circulation performance of the cell is improved, and the electrolyte infiltration effect is improved.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the bare cell is formed by laminating an isolating film, a positive plate and a negative plate, through holes are formed in the isolating film, the positive plate and the negative plate, and the through holes are at least partially overlapped in the direction perpendicular to the plane of the through holes.
Preferably, the diameter of the through hole on the negative plate is smaller than that of the through hole on the positive plate.
Further preferably, the diameter of the through hole on the negative plate is between 1 and 10 mm.
Still further preferably, the diameter of the through hole in the negative electrode sheet is 1mm.
Further preferably, the diameter of the through hole on the positive plate is between 1 and 10 mm.
Still further preferably, the diameter of the through hole in the positive electrode sheet is 2mm.
Preferably, the diameter of the through hole on the isolating film is not smaller than the diameters of the through holes on the negative plate and the positive plate.
Further preferably, the diameter of the through hole on the isolating film is between 2 and 12 mm.
Preferably, the through holes are circular, oval, triangular, rectangular or other polygonal.
A battery includes a housing and the bare cell located inside the housing.
Compared with the prior art, the utility model has the following advantages:
the bare cell provided by the utility model has the advantages that electrolyte can enter the cell through the through holes on the isolating film, the positive plate and the negative plate, so that the circulation performance of the cell is improved, and the electrolyte infiltration effect is improved.
The bare cell can accelerate the production efficiency of the cell in the liquid injection and secondary liquid injection working section, and the production beat and the productivity can be improved because the infiltration effect is improved, so that the cost is reduced.
Drawings
Fig. 1 is a schematic perspective view of a bare cell according to the present utility model.
Fig. 2 is a schematic diagram of a partially exploded structure of a bare cell according to the present utility model.
Reference numerals illustrate: 1-bare cell; 11-a separation membrane; 12-positive plate; 13-a negative plate; 14-through holes.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present utility model, preferred embodiments of the present utility model will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
As shown in fig. 1-2, the utility model provides a bare cell, wherein the bare cell 1 is formed by stacking a separation film 11, a positive electrode plate 12 and a negative electrode plate 13, through holes 14 are formed in the separation film 11, the positive electrode plate 12 and the negative electrode plate 13, and the through holes 14 are at least partially overlapped in the plane direction perpendicular to the through holes 14. One or more through holes 14 may be provided on the separator 11, the positive electrode sheet 12, and the negative electrode sheet 13 to regulate the flow rate of the electrolyte.
Specifically, the through holes 14 arranged on the positive electrode plate 12 and the negative electrode plate 13 are realized by laser cutting, the through holes 14 are preferably designed by round holes, the round holes are generally positioned in the middle of the pole piece and the isolating film 11, and the strength of the pole piece and the isolating film 11 is not influenced to the greatest extent.
As shown in fig. 2, the diameter of the through hole 14 on the negative electrode plate 13 is smaller than that of the through hole 14 on the positive electrode plate 12, so that AC Overhang is ensured, and cyclic lithium precipitation of the battery cell is avoided. Among them, the diameter of the through hole 14 in the negative electrode sheet 13 is between 1 and 10mm, and it is most preferable that the diameter is 1mm. The diameter of the through hole 14 in the positive electrode sheet 12 is between 1 and 10mm, and it is most preferable that the diameter is 2mm.
As shown in fig. 2, the diameter of the through hole 14 on the separator 11 is not smaller than the diameters of the through holes 14 on the negative electrode sheet 13 and the positive electrode sheet 12, and the diameter of the through hole 14 on the separator 11 is between 2 and 12mm, so as to ensure that the through holes 14 on the negative electrode sheet 13 and the positive electrode sheet 12 can have sufficient circulation space.
The bare cell 1 provided by the utility model realizes that electrolyte can enter the cell through the through holes 14 on the isolating film 11, the positive plate 12 and the negative plate 13, so that the circulation performance of the cell is improved, and the electrolyte infiltration effect is improved.
The bare cell 1 can accelerate the production efficiency of the cell in the liquid injection and secondary liquid injection working sections, and can improve the production beat and the productivity because of improving the infiltration effect, thereby reducing the cost.
Based on the structural design of the bare cell 1, the utility model also provides a battery, which comprises a shell and the bare cell 1 positioned inside the shell. Wherein the housing comprises any one of a square housing, a cylindrical housing, or a composite housing. Firstly, cutting the anode and cathode raw materials into rectangular pole pieces with the same size, respectively stacking the rectangular pole pieces on the isolating film 11, passing the isolating film 11, separating the two poles, and finally packaging. Because the outermost layer is a pole piece and is easy to cause short circuit and scratch, the outermost ring is generally wound with a separation film 11 for one to two circles for protection, and finally the battery is assembled by assembling a shell.
The bare cell and the battery of the present utility model can be easily manufactured or used by those skilled in the art based on the description of the present utility model and the accompanying drawings, and can produce the positive effects described in the present utility model.
Unless specifically stated otherwise, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present utility model and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present utility model are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (10)
1. Naked electric core, naked electric core (1) are formed by barrier film (11), positive pole piece (12) and negative pole piece (13) range upon range of, its characterized in that: through holes (14) are formed in the isolating film (11), the positive electrode plate (12) and the negative electrode plate (13), and the through holes (14) are at least partially overlapped in the direction perpendicular to the plane of the through holes (14).
2. The bare cell of claim 1 wherein: the diameter of the through hole (14) on the negative electrode plate (13) is smaller than that of the through hole (14) on the positive electrode plate (12).
3. The bare cell of claim 2 wherein: the diameter of the through hole (14) on the negative plate (13) is between 1 and 10 mm.
4. The bare cell of claim 3 wherein: the diameter of the through hole (14) on the negative plate (13) is 1mm.
5. The bare cell of claim 2 wherein: the diameter of the through hole (14) on the positive plate (12) is 1-10 mm.
6. The bare cell of claim 5 wherein: the diameter of the through hole (14) on the positive plate (12) is 2mm.
7. The bare cell of claim 1 wherein: the diameter of the through hole (14) on the isolating film (11) is not smaller than the diameters of the through holes (14) on the negative plate (13) and the positive plate (12).
8. The bare cell of claim 7 wherein: the diameter of the through hole (14) on the isolating film (11) is between 2 and 12 mm.
9. The bare cell of claim 1 wherein: the through holes (14) are circular, elliptical, triangular, rectangular or other polygonal shapes.
10. A battery, characterized in that: the battery comprises a housing and a bare cell (1) according to any of claims 1-9 inside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321031712.0U CN219800974U (en) | 2023-04-25 | 2023-04-25 | Bare cell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321031712.0U CN219800974U (en) | 2023-04-25 | 2023-04-25 | Bare cell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219800974U true CN219800974U (en) | 2023-10-03 |
Family
ID=88178274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321031712.0U Active CN219800974U (en) | 2023-04-25 | 2023-04-25 | Bare cell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219800974U (en) |
-
2023
- 2023-04-25 CN CN202321031712.0U patent/CN219800974U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |