CN219937077U - Winding cell and secondary battery - Google Patents
Winding cell and secondary battery Download PDFInfo
- Publication number
- CN219937077U CN219937077U CN202223241958.9U CN202223241958U CN219937077U CN 219937077 U CN219937077 U CN 219937077U CN 202223241958 U CN202223241958 U CN 202223241958U CN 219937077 U CN219937077 U CN 219937077U
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- China
- Prior art keywords
- negative
- negative electrode
- ceramic layer
- battery cell
- pole piece
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- 238000004804 winding Methods 0.000 title abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 39
- 239000003792 electrolyte Substances 0.000 claims abstract description 15
- 230000004888 barrier function Effects 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 239000002985 plastic film Substances 0.000 claims 1
- 229920006255 plastic film Polymers 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 238000001556 precipitation Methods 0.000 abstract description 8
- 238000009792 diffusion process Methods 0.000 abstract description 6
- 230000008093 supporting effect Effects 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 26
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model belongs to the technical field of secondary batteries, and particularly relates to a winding battery cell which comprises a first isolating film, a positive plate, a second isolating film and a negative plate, wherein the first isolating film, the positive plate, the second isolating film and the negative plate are sequentially stacked and placed to form a composite pole piece, the composite pole piece is wound to obtain the winding battery cell, the winding battery cell comprises a flattening part and corner parts arranged at two ends of the flattening part, and a negative ceramic layer is arranged on at least one surface of the negative plate, which is positioned at the corner parts. According to the winding battery cell, the negative electrode ceramic layer is arranged at the corner of the winding battery cell, so that the battery cell provides a supporting effect in the charge-discharge cycle process, the situation that the diaphragm film is excessively tightly adhered to the negative electrode sheet to influence the diffusion of electrolyte is avoided, the adverse conditions of extrusion deformation, wrinkling, black spots, lithium precipitation and the like caused by expansion of the electrode sheet are avoided, and the cycle life of the battery is further prolonged.
Description
Technical Field
The utility model belongs to the technical field of secondary batteries, and particularly relates to a winding battery core and a secondary battery.
Background
In the charging process of the lithium ion battery, lithium ions can be released from the positive electrode and intercalated into the negative electrode. However, if some abnormal conditions occur and lithium ions released from the positive electrode cannot be inserted into the negative electrode, lithium ions are precipitated only on the surface of the negative electrode, so that a gray substance is formed, which is called lithium precipitation.
After lithium precipitation occurs, the battery performance is reduced, the cycle life is greatly shortened, the quick charge capacity of the battery is limited, and the disastrous consequences such as combustion, explosion and the like can be caused.
In the circulation process, the electrode expansion of the battery cell extrudes the corner part, so that electrolyte near the corner in the circulation process cannot be timely supplemented into the pole piece, the electrolyte at the corner is dried up, lithium is separated out, the thickness of the battery cell is increased along with the accumulation of the lithium separation, and the circulation expansion failure is caused, and therefore, a technical scheme for solving the problems is needed.
Disclosure of Invention
The utility model aims at: aiming at the defects of the prior art, the winding battery cell is provided, the negative electrode plate is provided with the negative electrode ceramic layer at the corner of the winding battery cell, so that the battery cell provides a supporting function in the charge-discharge cycle process, the adhesion of a diaphragm film and the negative electrode plate is avoided, the diffusion of electrolyte is influenced, and the adverse conditions of extrusion deformation, wrinkling, black spots, lithium precipitation and the like caused by the expansion of a pole piece are avoided, thereby prolonging the cycle life of the battery.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a coiling electricity core, includes first barrier film, positive plate, second barrier film, negative plate, first barrier film the positive plate the second barrier film with the negative plate stacks gradually and places the compound pole piece of formation, compound pole piece coiling obtains coiling electricity core, coiling electricity core includes the plain end and sets up in the corner at the both ends of plain end, the negative plate is located at least one surface of corner and is provided with negative electrode ceramic layer.
Wherein the thickness of the negative electrode ceramic layer is 5-40 mu m.
Wherein the thickness of the negative electrode ceramic layer is 10-30 mu m.
Wherein the coating surface density of the negative electrode ceramic layer is 0.1-20 mg/1540.25mm 2 。
Wherein the coating surface density of the negative electrode ceramic layer is 5-10 mg/1540.25mm 2 。
Wherein the negative electrode ceramic layer is made of ceramic powder.
The negative electrode plate further comprises a negative electrode current collector and a negative electrode active coating arranged on at least one surface of the negative electrode current collector, and the negative electrode ceramic layer is arranged on at least one surface of the negative electrode active coating.
Wherein the negative current collector is copper foil.
The second object of the present utility model is: in order to overcome the shortcomings of the prior art, a secondary battery is provided, which has a good cycle life.
A secondary battery comprises electrolyte, a shell and the winding battery core, wherein the shell is used for packaging the electrolyte and the winding battery core.
Wherein, the material of casing is one of stainless steel, plastic-aluminum membrane, steel casing.
Compared with the prior art, the utility model has the beneficial effects that: according to the winding battery cell, the negative electrode ceramic layer is arranged at the corner of the winding battery cell, so that the battery cell provides a supporting effect in the charge-discharge cycle process, the situation that the diaphragm film is excessively tightly adhered to the negative electrode sheet to influence the diffusion of electrolyte is avoided, the adverse conditions of extrusion deformation, wrinkling, black spots, lithium precipitation and the like caused by expansion of the electrode sheet are avoided, and the cycle life of the battery is further prolonged.
Drawings
Fig. 1 is a schematic structural view of a wound cell of the present utility model.
Wherein: 1. a separation film; 2. a positive plate; 3. a negative plate.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; 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 can be understood by those of ordinary skill in the art according to the specific circumstances.
The present utility model will be described in further detail below with reference to the drawings, but is not limited thereto.
The winding battery cell comprises a first isolating film 1, a positive electrode plate 2, a second isolating film 1 and a negative electrode plate 3, wherein the first isolating film 1, the positive electrode plate 2, the second isolating film 1 and the negative electrode plate 3 are sequentially stacked to form a composite electrode plate, the composite electrode plate is wound to obtain the winding battery cell, the winding battery cell comprises a flat portion and corner portions arranged at two ends of the flat portion, and at least one surface of the negative electrode plate 3, which is positioned at the corner portion, is provided with a negative electrode ceramic layer.
As shown in fig. 1, the negative electrode plate 3 is provided with the negative electrode ceramic layer at the corner of the winding battery core, so that the battery core provides a supporting effect in the charge-discharge cycle process, the adhesion of a diaphragm film and the negative electrode plate 3 is avoided, the diffusion of electrolyte is influenced, gaps exist between ceramic powders, channels can be provided for the diffusion of the electrolyte, the electrolyte in the cycle process can be timely supplemented to the corner, the lithium precipitation at the corner of the battery core is improved, the effect of improving the expansion of the battery core is achieved, the adverse conditions of extrusion deformation, wrinkling, black spots, lithium precipitation and the like caused by the expansion of a pole piece are avoided, and the cycle life of the battery is prolonged. The negative electrode ceramic layer is only arranged at the corner of the battery cell, so that the overall thickness of the battery cell is not increased, and the energy density of the battery cell is improved.
The negative electrode plate 3 is provided with a plurality of negative electrode ceramic layers, the interval between two adjacent negative electrode ceramic layers is L, the width of each negative electrode ceramic layer is M, the corresponding circle radius of each negative electrode ceramic layer at the corner of the bare cell is N (according to the number of non-layers being N1, N2, N3 and the like respectively), the thickness of the bare cell is H, the width is W, the width M=pi/2*N delta (size deviation) (N is calculated according to the corresponding radius size selected by the N in different layers), and the ceramic coating interval L=the width W of the bare cell to the thickness H+delta (size deviation) of the bare cell.
In the winding battery cell of this embodiment, the thickness of the negative electrode ceramic layer is 5-40 μm. Preferably, the thickness of the negative electrode ceramic layer is 5 μm, 10 μm, 20 μm, 30 μm, 40 μm. Specifically, the thickness of the negative electrode ceramic layer was 20 μm.
The material of the negative electrode ceramic layer in this embodiment is ceramic powder. The ceramic powder has good insulativity, is coated on the corner piece of the negative electrode piece 3 after being prepared into coating slurry, and can form an electrolyte diffusion channel between the isolating membrane 1 and the negative electrode piece 3 due to the fact that the ceramic powder has a certain particle size, so that electrolyte can be timely supplemented to the corner in the circulation process, lithium precipitation at the corner of the battery cell is improved, and the effect of battery cell expansion is improved.
The negative electrode sheet 3 of this embodiment further includes a negative electrode current collector and a negative electrode active coating layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode ceramic layer is disposed on at least one surface of the negative electrode active coating layer, and the coating surface density of the negative electrode ceramic layer is 0.1-20 mg/1540.25mm 2 . The negative electrode ceramic layer is provided with a certain coating surface density, so that the negative electrode ceramic layer has a certain supporting function and also has a certain electrolyte conducting function.
While the foregoing description illustrates and describes several preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.
Claims (10)
1. The utility model provides a coiling electricity core, its characterized in that includes first barrier film, positive plate, second barrier film, negative pole piece, first barrier film positive plate second barrier film with the negative pole piece stacks gradually and places the formation compound pole piece, compound pole piece coiling obtains coiling electricity core, coiling electricity core includes the plain end portion and sets up in the corner at the both ends of plain end portion, the negative pole piece is located at least one surface of corner and is provided with negative pole ceramic layer.
2. The wound cell of claim 1, wherein the negative ceramic layer has a thickness of 5-40 μm.
3. The wound cell of claim 2, wherein the negative ceramic layer has a thickness of 10-30 μm.
4. The wound cell of claim 1, wherein the negative ceramic layer has a coated surface density of 0.1-20 mg/1540.25mm 2 。
5. The coiled electrical cell of claim 4, wherein the negative ceramic layer has a coated surface density of 5-10 mg/1540.25mm 2 。
6. The wound cell of claim 1, wherein the negative ceramic layer is a ceramic powder.
7. The wound cell of claim 1, wherein the negative electrode tab further comprises a negative electrode current collector and a negative electrode active coating disposed on at least one surface of the negative electrode current collector, and wherein the negative electrode ceramic layer is disposed on at least one surface of the negative electrode active coating.
8. The wound cell of claim 7, wherein the negative current collector is copper foil.
9. A secondary battery comprising an electrolyte, a case, and the wound cell according to any one of claims 1 to 8, wherein the case is used to package the electrolyte and the wound cell according to any one of claims 1 to 8.
10. The secondary battery according to claim 9, wherein the case is made of one of stainless steel, an aluminum plastic film, and a steel case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241958.9U CN219937077U (en) | 2022-12-05 | 2022-12-05 | Winding cell and secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241958.9U CN219937077U (en) | 2022-12-05 | 2022-12-05 | Winding cell and secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219937077U true CN219937077U (en) | 2023-10-31 |
Family
ID=88501795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223241958.9U Active CN219937077U (en) | 2022-12-05 | 2022-12-05 | Winding cell and secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219937077U (en) |
-
2022
- 2022-12-05 CN CN202223241958.9U patent/CN219937077U/en active Active
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