CN220041907U - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN220041907U CN220041907U CN202321519562.8U CN202321519562U CN220041907U CN 220041907 U CN220041907 U CN 220041907U CN 202321519562 U CN202321519562 U CN 202321519562U CN 220041907 U CN220041907 U CN 220041907U
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- 238000000576 coating method Methods 0.000 claims abstract description 81
- 239000011248 coating agent Substances 0.000 claims abstract description 73
- 239000011247 coating layer Substances 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 4
- 238000005524 ceramic coating Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 239000012212 insulator Substances 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a battery cell and a battery, wherein the battery cell comprises: the positive plate comprises a positive main body part and a positive coating; the negative plate comprises a negative main body part and a negative coating; a first insulating member; wherein, positive plate and negative pole piece are convoluteed in order to form the electric core, define the afterbody that the electric core was convoluteed as the ending district, in the ending district, the both sides on the thickness direction of negative pole main part all are equipped with the negative pole coating, the positive pole main part of the positive plate that is located the outside of negative pole piece is including keeping away from the terminal first section of negative pole piece relatively and being close to the terminal second section of negative pole piece relatively, first section is equipped with the positive pole coating in the inboard towards the negative pole piece, the second section is equipped with first insulating part in the inboard towards the negative pole piece. The battery cell can prevent the battery cell ending region from deforming in the hot press molding and subsequent use processes of the battery, so as to ensure the cycle performance and the safety performance of the battery.
Description
Technical Field
The utility model relates to the technical field of new energy, in particular to a battery cell and a battery.
Background
Along with the development of scientific technology, the application of new energy batteries is more and more widespread, and the lithium ion batteries are widely applied to the fields of consumer electronics and power because of the characteristics of high energy density, quick charge capability, safety and the like, and the soft package batteries in the lithium ion batteries occupy a great proportion and are widely applied to portable equipment such as mobile phones and the like, so that the lithium ion batteries have higher requirements on the energy density and the cycle performance of the soft package batteries. When the soft package battery is designed and manufactured, in order to ensure the safety performance of the battery, the tail part of the battery cell, the negative electrode plate is normally ended, and partial areas on the positive electrode plate corresponding to the end part of the negative electrode plate are not coated with active coatings.
However, in the manufacturing process of the battery cell, hot pressing is performed after the positive and negative electrode plates are wound, and as the positive electrode plate is provided with a region without a coating, the tail of the battery cell may deform in the hot pressing process, and the deformation phenomenon is easy to occur at the tail of the battery cell of the soft package battery along with the continuous increase of the times of charging and discharging after the battery cell is formed, the deformed battery cell has the problems of poor appearance, capacity reduction, cycle performance, safety performance reduction and the like.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the battery cell, which can prevent the tail of the battery cell from deforming in the hot press molding and later use processes, thereby ensuring the cycle performance and the safety performance of the battery.
The utility model also provides a battery using the battery cell.
According to an embodiment of the first aspect of the present utility model, a battery cell includes:
the positive plate comprises a positive main body part and a positive coating;
the negative plate comprises a negative main body part and a negative coating;
a first insulating member;
the battery cell is formed by winding a positive plate and a negative plate, the tail of the battery cell is defined to be a tail-end area, in the tail-end area, negative coatings are arranged on two sides of the negative main body part in the thickness direction, the positive main body part of the positive plate positioned on the outer side of the negative plate comprises a first section relatively far away from the tail end of the negative plate and a second section relatively close to the tail end of the negative plate, the first section is provided with the positive coatings in the inner side direction of the negative plate, and the second section is provided with the first insulating part in the inner side direction of the negative plate.
The battery cell provided by the embodiment of the utility model has at least the following beneficial effects:
the battery cell of a winding core structure is generally arranged at the tail end of the battery cell towards the inner side of the negative electrode plate at the first end of the positive electrode main body part to prevent lithium from separating out, and a first insulating part is arranged in the area to prevent the height difference between the positive electrode plate and the negative electrode plate in the tail end area, so that deformation in the hot press forming and the subsequent use process of the battery is avoided, and the cycle performance and the safety performance of the battery are ensured.
In other embodiments of the present utility model, the positive electrode main body portion of the positive electrode sheet located inside the negative electrode sheet includes a third section relatively far from the negative electrode sheet end and a fourth section relatively close to the negative electrode sheet end, both sides of the third section in the thickness direction are provided with the positive electrode coating layer, the fourth section is provided with the positive electrode coating layer in the inside direction away from the negative electrode sheet end, and the fourth section is left white in the outside direction toward the negative electrode sheet end.
In other embodiments of the present utility model, the battery cell further includes a second insulating member, the positive electrode main body portion of the positive electrode sheet located inside the negative electrode sheet includes a third section relatively far from the negative electrode sheet end and a fourth section relatively close to the negative electrode sheet end in the ending region, both sides in the thickness direction of the third section are provided with the positive electrode coating layer, the fourth section is provided with the positive electrode coating layer in the inside direction away from the negative electrode sheet end, and the second insulating member is provided in the fourth section in the outside direction toward the negative electrode sheet end.
In other embodiments of the present utility model, the second segment and the fourth segment are equal in length in the length direction of the positive electrode sheet.
In other embodiments of the utility model, the first insulator and/or the second insulator is a ceramic coating.
In other embodiments of the present utility model, the amount of application of the positive electrode coating in the direction of the first segment toward the inside of the negative electrode sheet is smaller than the amount of application of the negative electrode coating in the corresponding negative electrode main body portion toward the outside of the first segment.
In other embodiments of the present utility model, the positive electrode coating layer in the direction of the inner side of the first section toward the negative electrode sheet has a plurality of grooves extending in the width direction of the positive electrode sheet, and the grooves are arranged at intervals in the length direction of the positive electrode sheet.
In other embodiments of the present utility model, the positive electrode tab further has an extension portion connected to the second section and extending along a circumferential direction of the battery cell to wrap the negative electrode tab.
In other embodiments of the utility model, the ratio of the length of the extension to the perimeter of the cell is no greater than 0.5.
A battery according to an embodiment of the second aspect of the present utility model includes:
the battery cell.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a cell in an embodiment of an aspect of the present utility model;
fig. 2 is an enlarged schematic view at a in fig. 1.
Reference numerals:
positive electrode sheet 100, positive electrode main body 110, first segment 111, second segment 112, third segment 113, fourth segment 114, extension 115, and positive electrode coating 120;
a negative electrode sheet 200, a negative electrode main body 210, and a negative electrode coating 220;
a first insulator 300;
a second insulator 400;
a septum 500.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 utility model provides a battery cell and a battery. The battery cell is of a coiled core structure, an insulating piece is additionally arranged between the positive plate and the negative plate in a tail-end area of the battery cell, deformation can be prevented in the hot press molding and the subsequent use process of the battery, and therefore the cycle performance and the safety performance of the battery are guaranteed. Embodiments of the present utility model are specifically described below with reference to the accompanying drawings.
In some embodiments, referring to fig. 1 and 2, the battery cell includes a positive electrode sheet 100 and a negative electrode sheet 200, where the positive electrode sheet 100 and the negative electrode sheet 200 are wound to form the battery cell, and at the tail of the battery cell, i.e., at a in fig. 1, we define the tail of the battery cell as a tail-out region for convenience of description. In the ending region, the negative electrode coating 220 is disposed in the thickness direction of the negative electrode main body 210 of the negative electrode sheet 200, the positive electrode coating 120 is not disposed on the outer side of the positive electrode main body 110 of the positive electrode sheet 100 located on the outer side of the negative electrode sheet 200 and far from the negative electrode sheet 200, and two regions, namely the first segment 111 and the second segment 112, are included on the inner side of the positive electrode main body 110 facing the negative electrode sheet 200. The outer side referred to herein is the inner side with respect to the winding center of the cell, and the outer side with respect to the winding center of the cell is the outer side in the radial direction of the cell. The first section 111 is a section relatively far away from the end of the negative electrode sheet 200, the second section 112 is a section relatively close to the end of the negative electrode sheet 200, the inner side of the first section 111 facing the negative electrode sheet 200 is provided with the positive electrode coating 120, the inner side of the second section 112 facing the negative electrode sheet 200 is provided with the first insulating member 300, and the thickness of the first insulating member 300 is equal to the thickness of the positive electrode coating 120. The thicknesses are not completely equal, and the difference in height between the negative electrode sheet 200 and the positive electrode sheet 100 may be reduced. It can be understood that the battery core forming process not only needs to wind the positive electrode sheet 100 and the negative electrode sheet 200, but also needs to perform other procedures such as hot pressing, and the first insulating member 300 is arranged on the inner side of the second section 112, so that deformation of a ending region in the hot pressing forming process can be prevented, and thus smooth forming of the battery is ensured, and when the battery is put into use after production, deformation of the tail of the battery core in the use process can be prevented by the first insulating member 300, so that the cycle life of the battery is prolonged, and the safety performance of the battery can be ensured.
It should be noted that, in the process of manufacturing the battery cell, in the process of winding the positive electrode sheet 100 and the negative electrode sheet 200 to form the battery cell, a diaphragm 500 is further required to be disposed between the positive electrode sheet 100 and the negative electrode sheet 200 (in the illustrated embodiment, the diaphragm 500 is disposed between the positive electrode sheet 100 and the negative electrode sheet 200), and in the ending region of the battery cell, both sides of the negative electrode main body 210 in the thickness direction are both provided with the negative electrode coating 220, while the positive electrode main body 110 of the positive electrode sheet 100 located outside the negative electrode sheet 200 is not provided with the positive electrode coating 120 away from the outside of the negative electrode sheet 200 (here, the positive electrode main body 110 does not have the negative electrode sheet 200 corresponding thereto, so that the positive electrode coating 120 is not provided), and the length of the positive electrode coating 120 disposed toward the inside of the negative electrode sheet 200 is smaller than the length of the negative electrode coating 220 on the negative electrode sheet 200 (that is, the positive electrode main body 110 includes the first section 111 and the second section 112, the first section 111 is disposed toward the inside of the negative electrode sheet 200, and the second section 112 is not disposed toward the inside of the negative electrode sheet 200), which is the working principle that the negative electrode coating 120 is disposed toward the outside of the negative electrode sheet 200, and the end of the negative electrode coating 120 is significantly reduced in the working principle that the end region of the negative electrode coating 200 is disposed toward the outside of the negative electrode coating 200, and the negative electrode coating 120 is disposed on the side of the negative electrode coating 120. The positive electrode coating 120 on the positive electrode sheet 100 outside the negative electrode sheet 200 in the ending region is shorter than the negative electrode coating 220 on the negative electrode sheet 200, thereby preventing the occurrence of the lithium precipitation phenomenon.
In some embodiments, referring to fig. 1 and 2, in the ending region, for convenience of description, we define that the positive body portion 110 of the positive electrode sheet 100 located inside the negative electrode sheet 200 has a third segment 113 and a fourth segment 114, where the fourth segment 114 is a segment near the end of the negative electrode sheet 200, positive electrode coatings 120 are disposed on both sides of the third segment 113 of the positive electrode body portion 110 in the thickness direction, positive electrode coatings 120 are also disposed on the inside of the fourth segment 114 far from the negative electrode sheet 200, corresponding to the negative electrode sheet 200 on the inside of the fourth segment 114, and no positive electrode coating 120 is disposed on the outside of the fourth segment 114 facing the negative electrode sheet 200.
In some embodiments, the battery cell further has a second insulating member 400, where the length of the second insulating member 400 corresponds to the length of the fourth segment 114, and is disposed on the outer side of the fourth segment 114 facing the negative electrode sheet 200, so as to prevent a height difference between the positive electrode sheet 100 and the negative electrode sheet 200 from being generated when the fourth segment 114 is not provided with the positive electrode coating 120, and the second insulating member 400 is disposed on the outer side of the fourth segment 114, that is, in a blank area, so that deformation of the tail of the battery cell during hot press molding and later use of the battery cell can be prevented, thereby ensuring the cycle life of the battery cell, and also ensuring the safety performance of the battery cell.
It should be noted that, during the operation of the battery core, the negative electrode sheet 200 in the ending region is taken as a reference, the positive electrode coating 120 on the positive electrode sheet 100 on the inner side of the negative electrode sheet 200 facing the outer side of the negative electrode sheet 200 corresponds to the negative electrode coating 220 on the inner side of the negative electrode sheet 200, the positive electrode coating 120 on the inner side of the positive electrode sheet 100 far from the negative electrode sheet 200 corresponds to the negative electrode coating 220 on the other negative electrode sheet 200 on the inner side of the negative electrode sheet 200 far from the ending region, so that the positive electrode coating 120 is disposed on the inner sides of the third section 113 and the fourth section 114 of the positive electrode main body 110 in the embodiment, and the negative electrode sheet 200 is disposed on the inner side of the positive electrode sheet 100 in the embodiment, and if the corresponding negative electrode sheet 200 is not disposed on the inner sides of the third section 113 and the fourth section 114 in other embodiments, the positive electrode coating 120 is not required to be disposed on the inner side.
In some embodiments, the lengths of the second segment 112 and the fourth segment 114 correspond to each other in the length direction of the positive electrode sheet 100, that is, the lengths of the second segment 112 and the fourth segment 114 are equal (it should be noted that, the equality is not necessarily identical, and there may be some errors in the lengths between the two due to processing precision in actual production). It can be appreciated that the lengths of the second section 112 and the fourth section 114 are equal, and the two areas are set to be left white in actual production more simply and quickly, and it is to be noted that the positive electrode coating 120 on the positive electrode sheet 100 is generally coated by a coating machine, the white left in the coating process of the coating machine is generally realized by the structural design of the coating machine, the lengths of the second section 112 and the fourth section 114 are the same, and the structure of the coating machine can simultaneously satisfy the white left in the two areas, thereby reducing the difficulty of production and processing.
Meanwhile, because the lengths of the second section 112 and the fourth section 114 are the same, the first insulating piece 300 and the second insulating piece 400 are respectively arranged at the positions of the second section 112 and the fourth section 114, and the specifications and the sizes of the first insulating piece 300 and the second insulating piece 400 can be designed to be consistent, and batch production and production can be carried out, so that the difficulty and the cost of manufacturing the battery cells can be further reduced.
In some embodiments, the materials of the first insulating member 300 and the second insulating member 400 are the same and are ceramic coatings, it can be understood that the first insulating member 300 and the second insulating member 400 mainly prevent the height difference between the positive plate 100 and the negative plate 200, avoid deformation at the tail of the battery cell, influence normal use of the battery, and the two also need to have insulating properties to prevent the battery cell from being shorted.
In some embodiments, the amount of application of the positive electrode coating 120 of the first segment 111 on the inside toward the negative electrode sheet 200 is less than the corresponding amount of application of the negative electrode coating 220 on the outside of the negative electrode body portion 210 toward the first segment 111. It should be noted that, in the tail portion of the battery cell, that is, in the ending region, both sides of the negative main body portion 210 of the negative electrode plate 200 are provided with the negative electrode coating 220, the coating amount of the negative electrode coating 220 on the outer side facing the first section 111 needs to be more than the coating amount of the positive electrode coating 120 on the inner side facing the negative electrode plate 200 of the first section 111, which is to prevent the battery cell from having too many local lithium ions on the positive electrode plate 100 on the outer side of the negative electrode plate 200 in the ending region and no empty lithium intercalation on the negative electrode plate 200 in the use process, thereby generating a lithium precipitation phenomenon, affecting the normal use of the battery cell.
In some embodiments, on the positive electrode coating 120 on the inner side of the first segment 111 toward the negative electrode sheet 200, there are a plurality of grooves extending along the width direction of the positive electrode sheet 100, and the respective grooves are arranged at intervals along the length direction of the positive electrode sheet 100, so that the coating amount of the positive electrode coating 120 on the inner side of the first segment 111 toward the negative electrode sheet 200 is smaller than the coating amount of the corresponding negative electrode sheet 200 toward the negative electrode coating 220 on the outer side of the first segment 111, to prevent lithium precipitation, and the provision of the plurality of grooves achieves this object, it is possible to prevent the thickness of the positive electrode coating 120 of the first segment 111 toward the inner side of the negative electrode sheet 200 from being changed, to avoid a height difference between the positive electrode sheet 100 and the negative electrode sheet 200 in the region of the first segment 111 after the first insulator 300 is provided, and to be deformed.
It can be understood that in practical application, the positive electrode coating 120 is not provided in the groove, but the thickness of the positive electrode coating 120 in the groove is smaller than the thicknesses of other positions to define the groove, in the actual production and manufacturing process, the first section 111 is coated once towards the inner side of the negative electrode sheet 200 to form a complete positive electrode coating 120, then the jump coating is performed to form the positive electrode coating 120 with a plurality of grooves, the thickness of the positive electrode coating 120 at the groove is smaller than the thicknesses of the positive electrode coating 120 at other positions, the problem that lithium is separated from the battery in the tail-ending region of the battery is solved, and meanwhile, the excessive reduction of the energy density of the battery can be avoided, so that the energy density of the battery is ensured to meet the requirement.
It should be noted that in some embodiments, the groove is not a specific groove body, but a region, and each region has a plurality of groove points therein, where the groove points are arranged in a certain arrangement manner to form a groove, so that the coating amount of the positive electrode coating 120 on the inner side of the first section 111 facing the negative electrode sheet 200 is smaller than the coating amount of the negative electrode coating 220 on the outer side of the negative electrode sheet 200 facing the first section 111, so as to ensure that no lithium precipitation phenomenon occurs in the ending region of the battery cell. In other embodiments, the first section 111 is provided with a plurality of grooves on the positive electrode coating 120 on the inner side facing the negative electrode sheet 200, the grooves penetrate to one side of the positive electrode coating 120 far away from the positive electrode main body 110 along the thickness direction of the positive electrode sheet 100, a plurality of groove points are provided on the groove wall on one side of the groove near the positive electrode main body 110, and each groove point is arranged in the groove according to a certain arrangement manner, so that after the positive electrode sheet 100 and the negative electrode sheet 200 are wound to form a battery cell, the possibility of lithium precipitation in the ending region of the battery cell is further reduced.
In some embodiments, referring to fig. 1, the positive electrode tab 100 further has an extension portion 115, where the extension portion 115 is connected to the second segment 112, in practical application, the extension portion 115 and the second segment 112 are in an integral structure, and the extension portion 115 is disposed along the circumferential extension of the battery core so as to wrap the negative electrode tab 200 in the ending region, it can be understood that after the battery core is wound, the ending generally needs to be performed by ending the positive electrode tab 100, and the negative electrode tab 200 is fully wrapped, and then the end portion of the positive electrode tab 100, that is, the end portion of the extension portion 115, is bonded by an adhesive tape or other means, so as to ensure the normal use of the battery.
In some embodiments, the ratio of the length of the extension portion 115 to the circumference of the battery cell is not greater than 0.5, it can be understood that the extension portion 115 extends along the circumference of the battery cell, so as to completely wrap the negative electrode sheet 200 in the ending region, so as to avoid the exposure of the negative electrode sheet 200, and also can play a certain role in protecting the internal structure of the battery cell, but the length of the extension portion 115 is not too long, and is generally set to be not greater than half the circumference of the battery cell, so that the waste of resources is prevented on the premise that the battery cell can be normally used, and the manufacturing cost is saved.
According to a second aspect of the present utility model, a battery is disclosed, including the above-mentioned battery cell, and an electrolyte and a housing, wherein the housing defines a cavity for accommodating the battery cell and the electrolyte, and it can be understood that the battery cell and the electrolyte are both disposed in the cavity defined by the housing, and the electrolyte wets the positive electrode tab 100 and the negative electrode tab 200, so as to ensure normal use of the battery.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The electric core, its characterized in that includes:
the positive plate comprises a positive main body part and a positive coating;
the negative plate comprises a negative main body part and a negative coating;
a first insulating member;
the battery cell is formed by winding a positive plate and a negative plate, the tail of the battery cell is defined to be a tail-end area, in the tail-end area, negative coatings are arranged on two sides of the negative main body part in the thickness direction, the positive main body part of the positive plate positioned on the outer side of the negative plate comprises a first section relatively far away from the tail end of the negative plate and a second section relatively close to the tail end of the negative plate, the first section is provided with the positive coatings in the inner side direction of the negative plate, and the second section is provided with the first insulating part in the inner side direction of the negative plate.
2. The cell according to claim 1, wherein in the ending region, the positive electrode main body portion of the positive electrode sheet located inside the negative electrode sheet includes a third section relatively far from the negative electrode sheet end and a fourth section relatively close to the negative electrode sheet end, both sides in a thickness direction of the third section are provided with the positive electrode coating layer, the fourth section is provided with the positive electrode coating layer in an inside direction away from the negative electrode sheet end, and the fourth section is provided with a margin in an outside direction toward the negative electrode sheet end.
3. The cell according to claim 1, further comprising a second insulating member, wherein in the ending region, the positive electrode main body portion of the positive electrode sheet located inside the negative electrode sheet includes a third section relatively distant from the negative electrode sheet end and a fourth section relatively close to the negative electrode sheet end, both sides in a thickness direction of the third section are provided with the positive electrode coating, the fourth section is provided with the positive electrode coating in an inside direction distant from the negative electrode sheet end, and the second insulating member is provided in the fourth section in an outside direction toward the negative electrode sheet end.
4. A cell according to claim 2 or 3, wherein the lengths of the second and fourth sections are equal in the length direction of the positive electrode sheet.
5. A cell according to claim 3, wherein the first and/or second insulating member is a ceramic coating.
6. The cell according to claim 1, wherein an application amount of the positive electrode coating in an inner direction of the first segment toward the negative electrode tab is smaller than an application amount of the negative electrode coating in an outer direction of the corresponding negative electrode main body portion toward the first segment.
7. The battery cell according to claim 6, wherein the positive electrode coating layer in the direction of the inner side of the first segment toward the negative electrode sheet has a plurality of grooves extending in the width direction of the positive electrode sheet, and the grooves are arranged at intervals in the length direction of the positive electrode sheet.
8. The cell of claim 1, wherein the positive electrode tab further has an extension connected to the second segment and extending along a circumference of the cell to encase the negative electrode tab.
9. The cell of claim 8, wherein the ratio of the length of the extension to the perimeter of the cell is no greater than 0.5.
10. A battery, comprising:
the cell of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321519562.8U CN220041907U (en) | 2023-06-14 | 2023-06-14 | Battery cell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321519562.8U CN220041907U (en) | 2023-06-14 | 2023-06-14 | Battery cell and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220041907U true CN220041907U (en) | 2023-11-17 |
Family
ID=88738961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321519562.8U Active CN220041907U (en) | 2023-06-14 | 2023-06-14 | Battery cell and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220041907U (en) |
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2023
- 2023-06-14 CN CN202321519562.8U patent/CN220041907U/en active Active
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