CN219534551U - Secondary cell positive plate assembly, secondary cell and electric equipment - Google Patents
Secondary cell positive plate assembly, secondary cell and electric equipment Download PDFInfo
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- CN219534551U CN219534551U CN202320487850.3U CN202320487850U CN219534551U CN 219534551 U CN219534551 U CN 219534551U CN 202320487850 U CN202320487850 U CN 202320487850U CN 219534551 U CN219534551 U CN 219534551U
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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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Abstract
The utility model belongs to the technical field of power batteries, and relates to a secondary battery positive plate assembly, a secondary battery and electric equipment. The secondary battery positive plate component comprises a positive plate, a positive active material layer and an insulating layer, wherein the positive plate is provided with a first surface, the positive active material layer is coated on the first surface, the insulating layer is distributed on two sides of the positive active material layer along a first direction, and the insulating layer is abutted against or at least partially covers two side edges of the positive active material layer. The beneficial effects include: the positive electrode plate is coated with the positive electrode active material layer and the insulating layer on the same side surface, and the insulating layer is arranged at two opposite side edges of the positive electrode active material layer, so that when the positive electrode plate component of the secondary battery is overlapped with the negative electrode plate, the weak area of the insulating layer and the negative electrode plate can be matched, the edge lithium precipitation is avoided, the process window is improved, the production difficulty is reduced, the cycling stability of the battery core is improved, and the reliability of the secondary battery and the electric equipment is improved.
Description
Technical Field
The utility model belongs to the technical field of power batteries, and particularly relates to a secondary battery positive plate assembly, a secondary battery and electric equipment.
Background
As one of the most core components of new energy automobiles, lithium ion batteries have the advantages of high energy density, long cycle life, safety, environmental protection and the like, and gradually become the main stream direction of the electric age. For the internal cell structure of a battery, from a large classification, there are mainly two types: the same side tab and the different side tab. For the same-side tab structure, the battery cell is mainly suitable for soft packages or square-shell same-side tab shells, and is suitable for battery cells with smaller length-width ratio; for the different-side tab structure, the battery cell is mainly suitable for different-side tab shells and is suitable for battery cells with larger length-width ratios. The same-side tab and different-side tab have a substantial influence on the performance of the battery, although the principle is basically equivalent.
For the same-side tab structure, because the positive electrode edge and the negative electrode edge are thinner, the N/P ratio of the positive electrode to the negative electrode (N refers to the negative electrode capacity in unit area, P refers to the positive electrode capacity in unit area, namely the ratio of the negative electrode capacity in unit area to the positive electrode capacity in unit area) can still maintain a larger proportion, and the lithium precipitation phenomenon can not occur in the circulating and quick charging processes; however, in the different-side tab structure, as the center of the pole piece is thicker, the edge area is thinner, the positive pole piece and the negative pole piece are overlapped and assembled, the positive pole thicker area is opposite to the negative pole thinner area, the N/P ratio of the edge area of the negative pole is greatly lower than that of the main structure, and the phenomena of lithium precipitation and even water jump easily occur in the circulation process and the quick charge process, so that the area becomes the weakest area inside the battery cell. Therefore, the N/P ratio and stability of the negative electrode edge region become the biggest bottleneck restricting the winding core on the opposite side of the positive electrode and the negative electrode.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a secondary battery positive electrode sheet assembly, a secondary battery and electric equipment, which are used for solving the problem of high risk of lithium precipitation at the negative electrode edge in the different-side tab structure in the prior art.
To achieve the above and other related objects, the present utility model provides a positive electrode tab assembly of a secondary battery, comprising:
a positive plate having a first surface;
a positive electrode active material layer coated on the first surface; and
and the insulating layers are coated on the first surface, are distributed on two sides of the positive electrode active material layer along the first direction, and are abutted against or at least partially cover two side edges of the positive electrode active material layer.
Optionally, in the first direction, a thickness of a middle portion of the positive electrode active material layer is greater than a thickness of both side edges of the positive electrode active material layer.
Optionally, in the first direction, the thickness of the positive electrode active material layer gradually decreases from the middle portion of the positive electrode active material layer to two side edges.
Alternatively, the difference between the maximum thickness of the middle portion of the positive electrode active material layer and the minimum thickness of both side edges of the positive electrode active material layer is 5 μm to 20 μm.
Optionally, in the first direction, the width D2 of the insulating layer is 2mm to 10mm.
To achieve the above and other related objects, the present utility model also provides a secondary battery comprising:
a positive electrode sheet assembly, which is a secondary battery positive electrode sheet assembly as described above;
a negative electrode sheet assembly including a negative electrode sheet coated with a negative electrode active material layer on a side of the negative electrode sheet facing the positive electrode active material layer, the negative electrode active material layer exceeding the positive electrode active material layer in the first direction;
and the separator is arranged in a lamination manner with the positive plate component and the negative plate component, and is positioned between the positive plate component and the negative plate component.
Alternatively, the width D3 of the anode active material layer beyond the cathode active material layer in the first direction is 0.5mm to 3mm.
Optionally, in the first direction, the insulating layer exceeds the anode active material layer.
Alternatively, in the first direction, the thicknesses of both sides of the anode active material layer are respectively greater than the thicknesses of the cathode active material layers of the corresponding sides.
To achieve the above object and other related objects, the present utility model also provides an electric device, including the positive electrode tab assembly of a secondary battery as described above or the secondary battery as described above.
As described above, the secondary battery positive plate component, the secondary battery and the electric equipment have at least the following beneficial effects: the same side surface of the positive plate is coated with a positive electrode active material layer and an insulating layer, and the insulating layer is positioned at two opposite side edges of the positive electrode active material layer, so that when the secondary battery positive plate component is overlapped with the negative plate, the insulating layer can be matched with the weak area of the negative plate, thereby avoiding edge lithium precipitation, improving a process window, reducing the production difficulty and improving the cycling stability of the battery core; in addition, the burrs of the positive plate can be prevented from being contacted with the negative plate through the insulating layer, the risks of self-discharging and internal short circuit of the battery core are greatly reduced, and the safety performance of the secondary battery and electric equipment is improved.
Drawings
Fig. 1 is a front view of an embodiment of a positive electrode tab assembly of a secondary battery of the present utility model;
fig. 2 is a top view of the positive electrode tab assembly of the secondary battery of fig. 1;
fig. 3 is a schematic structural view of an embodiment of a secondary battery of the present utility model;
fig. 4 is a schematic structural diagram of the positive electrode sheet assembly and the negative electrode sheet assembly in fig. 3.
Description of the part reference numerals
Positive electrode sheet assembly 100, positive electrode sheet 101, positive electrode active material layer 102, insulating layer 103, negative electrode sheet assembly 200, negative electrode sheet 201, negative electrode active material layer 202, and separator 300.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Referring to fig. 1 to 4, in an alternative embodiment, the present utility model provides a secondary battery including a positive electrode tab assembly 100, a negative electrode tab assembly 200, and a separator 300. The separator 300, the positive electrode sheet assembly 100, and the negative electrode sheet assembly 200 are stacked, and the separator 300 is positioned between the positive electrode sheet assembly 100 and the negative electrode sheet assembly 200.
Alternatively, the negative electrode tab assembly 200 includes a negative electrode tab 201, and the negative electrode tab 201 is coated with a negative electrode active material layer 202.
Referring to fig. 1 to 4, in an alternative embodiment, the positive electrode tab assembly 100 in the above embodiment is a secondary battery positive electrode tab assembly 100 provided by the present utility model, and includes a positive electrode tab 101, a positive electrode active material layer 102, and an insulating layer 103. The positive electrode sheet 101 has a first surface, a positive electrode active material layer 102 and an insulating layer 103 are coated on the first surface, and the insulating layer 103 is distributed on both sides of the positive electrode active material layer 102 in a first direction and abuts against or at least partially covers both side edges of the positive electrode active material layer 102. In the present utility model, the first direction may be the width direction of the positive electrode sheet 101, that is, the X direction in the drawing, the length direction of the positive electrode sheet 101 is the Y direction, and the thickness directions of the insulating layer 103 and the positive electrode active material layer 102 are the Z direction.
Optionally, the positive electrode sheet 101 further has a second surface disposed opposite to the first surface, and the second surface is also coated with the positive electrode active material layer 102 and the insulating layer 103. The distribution position and thickness of the cathode active material layer 102 and the insulating layer 103 coated on the second surface may correspond to those of the cathode active material layer 102 and the insulating layer 103 distributed on the first surface. Further, the positive electrode sheet 101 may have a square structure.
Optionally, the material of the positive electrode sheet 101 includes aluminum foil, and the material of the negative electrode sheet 201 includes copper foil. It is to be understood that the materials used for the positive electrode sheet 101 and the negative electrode sheet 201 are not limited to the above-described materials, and that other materials suitable for electrode reactions may be used for the positive electrode sheet 101 and the negative electrode sheet 201.
Alternatively, the material of the insulating layer 103 may be a mixture of dried mixed slurry of electrodeless nonmetallic ceramic particles and a binder; or the insulating layer 103 may be made of a mixture of organic polymer materials as a main material.
Alternatively, in the first direction, the thickness of the middle portion of the positive electrode active material layer 102 is greater than the thickness of both side edges of the positive electrode active material layer 102. Further, in the first direction, the thickness of the positive electrode active material layer 102 gradually decreases from the middle portion to both side edges of the positive electrode active material layer 102. In the production process, since the positive electrode sheet 101 needs to be coated with the positive electrode active material layer 102 before being transported to the next process and cut into the positive electrode sheet assembly 100, in order to facilitate transportation, the positive electrode sheet 101 coated with the positive electrode active material layer 102 needs to be wound to form a wound body, if the thick areas of the positive electrode active material layer 102 are concentrated at two side edges, the winding process is wound around the X direction all the time, the two side edges are thicker, the positive electrode sheet 101 is easy to be broken or the cold-pressed edges are broken, the thicknesses of the two side edges of the positive electrode active material layer 102 arranged in the embodiment are smaller than the thickness of the middle part, and the risk that the edges of the wound body, which are caused by the fact that the thickness of the edges of the positive electrode sheet 101 is larger than the thickness of the middle part, break the edges of the positive electrode sheet 101 and the cold-pressed edges when in the winding process are broken can be effectively avoided.
Alternatively, the difference between the maximum thickness of the middle portion of the positive electrode active material layer 102 and the minimum thickness of both side edges of the positive electrode active material layer 102 is 5 μm to 20 μm. Further, the difference between the maximum thickness of the middle portion of the positive electrode active material layer 102 and the minimum thickness of both side edges of the positive electrode active material layer 102 may be any one of values of 5 μm, 6 μm, 12 μm, 17 μm, or 20 μm. In the present embodiment, the average thickness of the middle width D1 of the positive electrode active material layer 102 may be taken as the maximum thickness of the middle of the active material layer 102, and the average thickness of the edge width D5 of the positive electrode active material layer 102 may be taken as the minimum thickness of the edge of the active material layer 102 in the first direction; wherein, D1 can be 2mm, and D5 can be 2mm, is favorable to reducing the detection degree of difficulty of anodal active material layer 102 thickness to reduce the degree of difficulty of manufacturing. It will be appreciated that the values of D1 and D5 may be selected as desired and are not limited to the exemplary 2mm values.
Alternatively, the width D2 of the insulating layer 103 is 2mm to 10mm in the first direction. Further, D2 may be any one of 2mm, 3mm, 4.5mm, 6mm, 8mm, 9mm, 10mm, etc.
According to the secondary battery positive plate assembly 100 of the embodiment, the insulating layers 103 are distributed on two sides of the positive electrode active material layer 102, so that the insulating layers 103 coated on the positive electrode plate 101 can be matched with the weak areas of the negative electrode plate 201, excessive thinning of the negative electrode edge areas formed after the positive electrode plate assembly 100 and the negative electrode plate assembly 200 are overlapped relative to other areas is avoided, the N/P ratio and stability of the negative electrode edge areas are improved, edge lithium precipitation is effectively avoided, a process window is improved, production difficulty is reduced, and the battery cell circulation stability is greatly improved.
Referring to fig. 1 and 4, in an alternative embodiment, the thickness of both sides of the anode active material layer 202 is greater than the thickness of the cathode active material layer 102 on the corresponding side, respectively, in the first direction, that is, the thickness of the anode active material layer 202 on the same side edge is greater than the thickness of the cathode active material layer 102 in the X direction, which is advantageous in ensuring that the N/P ratio is in a proper range, preventing lithium precipitation. It is understood that the edge thickness of the anode active material layer 202 mentioned in this embodiment may be an average thickness of the anode active material layer 202 within a certain width range in the first direction, and the edge thickness of the cathode active material layer 102 may be an average thickness of the cathode active material layer 102 within a certain width range in the first direction; specifically, for example, the negative electrode active material layer 202 has an average thickness when the edge width D6 is 1mm, and the positive electrode active material layer 102 has an average thickness when the edge width D5 is 1 mm.
Referring to fig. 1, 3 and 4, in an alternative embodiment, the negative electrode sheet 201 is coated with a negative electrode active material layer 202 on a side facing the positive electrode active material layer 102, the negative electrode active material layer 202 exceeding the positive electrode active material layer 102 in the first direction.
Alternatively, the width D3 of the anode active material layer 202 beyond the cathode active material layer 102 in the first direction is 0.5mm to 3mm. Further, D3 may be any one of values of 0.5mm, 1mm, 1.5mm, 1.8mm, 2.5mm, or 3mm. The D3 adopts a proper numerical range, so that the difficulty in processing is reduced due to the difficulty in ensuring the capability of the working procedure due to the excessively small D3 value, and the waste caused by the excessively large D3 value is avoided.
Alternatively, in the first direction, the insulating layer 103 exceeds the anode active material layer 202, ensuring that burrs on the surface of the positive electrode sheet 101 do not contact the anode active material layer 202 on the anode sheet 201.
Alternatively, both ends of the separator 300 protrude beyond the insulating layer 103 in the first direction, that is, both ends of the separator 300 protrude beyond the anode active material layer 202 and the cathode active material layer 102 in the first direction. The negative electrode tab 201 protrudes from one end of the separator 300 in the first direction, the positive electrode tab 101 protrudes from the other end of the separator 300 in the first direction, the portion of the negative electrode tab 201 protruding from the separator 300 may be formed as a negative electrode tab, the portion of the positive electrode tab 101 protruding from the separator 300 may be formed as a negative electrode tab, and the structural design enables the positive electrode tab and the negative electrode tab to be arranged on opposite sides. Wherein the weak area of the negative electrode active material is near one end of the negative electrode sheet 201 protruding from the separator 300.
In the secondary battery of the above embodiment, the insulating layer 103 exceeds the negative electrode active material layer 202, so that the surface burrs of the positive electrode plate 101 are effectively prevented from contacting the negative electrode active material layer 202 on the negative electrode plate 201, the risks of self-discharge and internal short of the battery core are greatly reduced, and the safety performance of the secondary battery is improved.
Referring to fig. 3, in an alternative embodiment, the number of the positive electrode sheet assemblies 100, the separator 300, and the negative electrode sheet assemblies 200 is multiple, and the positive electrode sheet assemblies 100, the separator 300, and the negative electrode sheet assemblies 200 are sequentially stacked in the Z-direction; in the Z-direction, the negative electrode sheet 201 is coated with the negative electrode active material layer 202 on both sides opposite to each other, that is, the side of the negative electrode sheet 201 facing the first surface of the positive electrode sheet 101 and the side facing the second surface of the positive electrode sheet 101 are coated with the negative electrode active material layer 202.
Referring to fig. 1 to 4, in an alternative embodiment, the present utility model further provides an electrical device, including the secondary battery positive electrode sheet assembly or the secondary battery according to any of the above embodiments.
Optionally, the electric equipment can be a battery module, a battery pack or an electric automobile.
According to the secondary battery positive plate assembly 100, the secondary battery and the electric equipment, through improving the structure of the positive plate assembly, the insulating layers 103 are arranged on the two opposite sides of the positive electrode active material layer 102, so that the insulating layers 103 matched with the weak areas of the negative electrode active material layer 202 are arranged, the N/P ratio of the negative electrode edge area after the positive electrode plate 101 and the negative electrode plate 201 are laminated is effectively prevented from being greatly lower than that of the main structure, the N/P ratio and the stability of the negative electrode edge area are improved, lithium precipitation at the edge is avoided, and the safety and the reliability of the secondary battery and the electric equipment are improved.
In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A secondary battery positive electrode sheet assembly, comprising:
a positive plate having a first surface;
a positive electrode active material layer coated on the first surface; and
and the insulating layers are coated on the first surface, are distributed on two sides of the positive electrode active material layer along the first direction, and are abutted against or at least partially cover two side edges of the positive electrode active material layer.
2. The secondary battery positive electrode tab assembly of claim 1 wherein: in the first direction, the thickness of the middle part of the positive electrode active material layer is greater than the thickness of both side edges of the positive electrode active material layer.
3. The secondary battery positive electrode tab assembly of claim 1 wherein: in the first direction, the thickness of the positive electrode active material layer gradually decreases from the middle portion of the positive electrode active material layer to both side edges.
4. The secondary battery positive electrode tab assembly according to claim 2 or 3, wherein: the difference between the maximum thickness of the middle part of the positive electrode active material layer and the minimum thickness of both side edges of the positive electrode active material layer is 5-20 μm.
5. The secondary battery positive electrode tab assembly of claim 1 wherein: in the first direction, the width D2 of the insulating layer is 2mm to 10mm.
6. A secondary battery, characterized by comprising:
a positive electrode sheet assembly, which is the secondary battery positive electrode sheet assembly according to any one of claims 1 to 5;
a negative electrode sheet assembly including a negative electrode sheet coated with a negative electrode active material layer on a side of the negative electrode sheet facing the positive electrode active material layer, the negative electrode active material layer exceeding the positive electrode active material layer in the first direction;
and the separator is arranged in a lamination manner with the positive plate component and the negative plate component, and is positioned between the positive plate component and the negative plate component.
7. The secondary battery according to claim 6, wherein: the width D3 of the negative electrode active material layer beyond the positive electrode active material layer in the first direction is 0.5mm to 3mm.
8. The secondary battery according to claim 6, wherein: in the first direction, the insulating layer exceeds the anode active material layer.
9. The secondary battery according to any one of claims 6 to 8, wherein: in the first direction, the thicknesses of both sides of the anode active material layer are respectively greater than the thicknesses of the cathode active material layers of the corresponding sides.
10. An electrical consumer, characterized in that: a secondary battery positive electrode sheet assembly comprising any one of claims 1 to 5 or a secondary battery as claimed in any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487850.3U CN219534551U (en) | 2023-03-14 | 2023-03-14 | Secondary cell positive plate assembly, secondary cell and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320487850.3U CN219534551U (en) | 2023-03-14 | 2023-03-14 | Secondary cell positive plate assembly, secondary cell and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219534551U true CN219534551U (en) | 2023-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320487850.3U Active CN219534551U (en) | 2023-03-14 | 2023-03-14 | Secondary cell positive plate assembly, secondary cell and electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219534551U (en) |
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2023
- 2023-03-14 CN CN202320487850.3U patent/CN219534551U/en active Active
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