CN216793947U - Pole piece, cylindrical battery core and cylindrical battery - Google Patents
Pole piece, cylindrical battery core and cylindrical battery Download PDFInfo
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- CN216793947U CN216793947U CN202123218113.3U CN202123218113U CN216793947U CN 216793947 U CN216793947 U CN 216793947U CN 202123218113 U CN202123218113 U CN 202123218113U CN 216793947 U CN216793947 U CN 216793947U
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Abstract
The utility model discloses a pole piece, a cylindrical battery cell and a cylindrical battery. The utmost point ear includes two tip utmost point ears and middle part utmost point ear, and the tip utmost point ear is connected in pole piece body one side at the both ends of pole piece body, and the middle part utmost point ear is connected in pole piece body one side at the middle part of pole piece body, and the length that two tip utmost point ears extend from pole piece body one side is greater than the length that middle part utmost point ear extended. The diameter of the current collecting piece is smaller than that of the cylindrical battery cell so as to prevent the current collecting piece from being in direct contact with the shell to generate short circuit, the length of a lug at the end part of the pole piece is longer than that of a lug at the middle part of the pole piece, the length of the lug at the edge of the cylindrical battery cell and the length of the lug at the center of the cylindrical battery cell can be ensured to be capable of contacting the current collecting piece after the cylindrical battery cell is formed, the kneading plane contact stability of the current collecting piece and the cylindrical battery cell is enhanced, and the conductive effect of the cylindrical battery is further improved.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a lithium battery.
Background
The pole piece of the cylindrical battery is generally a long rectangular shape, in the manufacturing process, some active materials are coated on one side of the pole piece in the length direction, a narrow area is reserved to be used as an output pole lug, the active materials such as a conductive agent are used, and the part on one side is reserved to be used as the pole lug for outputting current.
In the manufacturing process of the cylindrical battery, two pole pieces need to be stacked together, a positive plate and a negative plate are separated by a diaphragm, the two pole pieces and the diaphragm are wound into a cylindrical battery cell, a through hole is reserved in the middle of the cylindrical battery cell and used for enabling a welding head to penetrate through the cylindrical battery cell to weld a current collecting plate and a pole, the pole lugs of the two pole pieces are respectively located at two ends of the cylindrical battery cell, one pole lug of each pole piece is a positive pole lug, and the other pole lug is used as a negative pole lug. In order to facilitate the current output from the tabs at the two ends and to reduce the occupied space of the tabs, the tabs at the two ends of the cylindrical battery cell are rolled by a pressing roller to form a kneading plane, and then the kneading plane and the current collecting piece are welded together. After the cylinder electricity core shaping, need to paint insulating material with the periphery of cylinder electricity core and prevent the outside casing of cylinder electricity core direct contact, the current collector piece also generally is the metal material and the centre also is equipped with the perforation in order to make things convenient for the soldered connection to pass, and the perforated diameter is greater than the through-hole diameter of cylinder electricity core in addition, in order to prevent current collector piece contact casing, generally can design the diameter of current collector piece into the tip diameter that is less than the cylinder electricity core, make the current collector piece install in cylinder electricity core tip back contactless casing.
The pole piece is the rectangle, behind the formation cylinder electricity core, the length that the utmost point ear at both ends extends along cylinder electricity core length direction is unanimous, all contact the current collector piece in order to make the utmost point ear of rubbing in the plane in order to form even welding, the edge utmost point ear of rubbing planar cylinder electricity core can be drawn close to the center, near the utmost point ear of through-hole can outwards be inclined, but because the utmost point ear length problem at the edge of cylinder electricity core, the edge of cylinder electricity core and near the utmost point ear of through-hole often can not contact the current collector piece, perhaps the contact is unstable, make the current collector piece can not weld the utmost point ear at the edge of cylinder electricity core and the utmost point ear of through-hole negative pole, electrically conductive effect can not reach the optimum.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a pole piece, a cylindrical battery cell and a cylindrical battery, so as to solve the problems in the prior art.
In order to solve the above problems, according to an aspect of the present invention, there is provided a pole piece applied to a cylindrical battery, the pole piece including a pole piece body and a tab. The pole piece body is long and coated with active materials, such as conductive particles. Utmost point ear extends from pole piece body along one side of length direction and forms, and utmost point ear includes two tip utmost point ears and middle part utmost point ear, and tip utmost point ear is connected in pole piece body one side at the both ends of pole piece body, and middle part utmost point ear is connected in pole piece body one side at the middle part of pole piece body, and the length that two tip utmost point ears extend from pole piece body one side is greater than the length that middle part utmost point ear extended. After the pole piece is wound into a cylindrical battery cell, a through hole is reserved in the center of the cylindrical battery cell for welding to pass through, the battery cells at two ends can be rolled by a compression roller to form a rubbing plane, a current collecting piece is installed, a through hole with the diameter larger than that of the through hole is also arranged in the center of the current collecting piece for welding, the diameter of the current collecting piece is smaller than that of the cylindrical battery cell so as to prevent the current collecting piece from being directly contacted with a shell to generate short circuit, after the lugs at two ends of the cylindrical battery cell are rubbed flat, the lug at the edge of the cylindrical battery cell and the lug at the center of the cylindrical battery cell can not be contacted with the current collecting piece due to the length problem, the current transmission effect of the current collecting piece is reduced, the length of the lug at the end part of the pole piece is longer than that of the lug at the middle part of the pole piece, the lengths of the lug at the edge of the cylindrical battery cell and the lug at the center of the cylindrical battery cell can be contacted with the current collecting piece, and the rubbing plane contact stability of the current collecting piece and the cylindrical battery cell is enhanced, thereby improving the conductive effect of the cylindrical battery.
In one embodiment, the ratio of the width of the end tab extending from the edge of the pole piece body to the width of the middle tab extending from the edge of the tab body ranges from 2 to 5.
In one embodiment, the two end tabs comprise a first end tab and a second end tab, and the length of the first end tab along the length direction of the pole piece body is greater than the length of the second end tab along the length direction of the pole piece body.
In one embodiment, the ratio of the length of the first end tab along the length direction of the pole piece body to the length of the middle tab along the length direction of the pole piece body ranges from 0.05 to 0.2.
In one embodiment, the ratio of the length of the second end tab along the length direction of the pole piece body to the length of the middle tab along the length direction of the pole piece body ranges from 0.05 to 0.2.
The utility model also relates to a cylindrical electrical core comprising:
the cylindrical core body is formed by winding the two pole pieces and the diaphragm arranged between the two pole pieces along the extending direction of one side of the pole piece body, so that the two pole lugs are respectively positioned at the two axial ends of the cylindrical core body;
and the two current collecting pieces are respectively connected to the lugs at the two axial ends of the cylindrical core body.
In one embodiment, the two current collecting pieces comprise a first current collecting piece and a second current collecting piece, the first current collecting piece comprises a current collecting piece body and an adapter piece, and one end of the adapter piece is connected to one side, far away from the cylindrical core body, of the current collecting piece body.
The utility model also relates to a cylindrical battery, which comprises a steel shell and the cylindrical battery core, wherein the cylindrical battery core comprises:
the steel casing, the steel casing includes the lateral wall and the top cap of bottom, cylinder, the bottom with the top cap connect in the both ends of lateral wall, cylinder electricity core install in the steel casing, two the current collector is connected respectively the bottom with the top cap.
The utility model also relates to a cylindrical battery, which comprises a steel shell and the cylindrical battery core, wherein the cylindrical battery core comprises:
the battery comprises a steel shell, a battery body and a battery cover, wherein the steel shell comprises a bottom cover, a cylindrical side wall and a top cover, the bottom cover and the top cover are connected to two ends of the side wall, a cylindrical battery cell is installed in the steel shell, and the top cover is provided with a pole;
the first current collecting piece is positioned at one end close to the top cover, and the adapter piece is connected to the pole;
the second current collecting piece is positioned at one end close to the bottom cover and connected to the bottom cover.
According to the utility model, the guide effect and welding stability of the current collecting plate of the cylindrical battery are improved by changing the length of the end tab of the pole piece, so that the conductivity of the battery can be enhanced, and the quality of the battery is improved.
Drawings
FIG. 1 is a schematic diagram of a pole piece of one embodiment of the present invention.
Fig. 2 and 3 are schematic diagrams of cylindrical cells of an embodiment of the utility model.
Fig. 4 is a schematic diagram of a cylindrical cell and current collector sheet according to an embodiment of the utility model.
Reference numerals: 1. pole pieces; 11. a pole piece body; 12. a tab; 121. an end tab; 1211. a first end tab; 1212. a second end tab; 122. a middle tab; 2. a cylindrical cell; 3. a current collector; 31. a collector body; 32. a patch;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the utility model can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
The utility model relates to a pole piece 1, wherein the pole piece 1 is applied to a cylindrical battery, and the pole piece 1 comprises a pole piece body 11 and a pole lug 12. The pole piece body 11 is strip-shaped and coated with active substances, such as conductive particles. Tab 12 extends from pole piece body 11 along one side of length direction width direction bar and forms, and tab 12 includes two tip utmost point ears 121 and middle part utmost point ear 122, and tip utmost point ear 121 connects in pole piece body 11 one side at the both ends of pole piece body 11, and middle part utmost point ear 122 connects in pole piece body 11 one side at the middle part of pole piece body 11, and the length that two tip utmost point ears 121 extend from pole piece body 11 one side is greater than the length that middle part utmost point ear 122 extends. After the pole piece 1 is wound into the cylindrical battery core 2, a through hole is reserved in the center of the cylindrical battery core 2 and used for being welded to penetrate through, the battery cores at two ends can be rolled by the compression roller to form a rubbing plane, and then the current collecting piece 3 is installed. For welding, the center of the current collecting piece 3 is also provided with a through hole with a diameter larger than that of the through hole, the diameter of the current collecting piece 3 is smaller than that of the cylindrical battery core 2 so as to prevent the current collecting piece 3 from being in direct contact with a shell to cause short circuit, after the lugs 12 at the two ends of the cylindrical battery core 2 are kneaded, the lugs 12 at the edge of the cylindrical battery core 2 and the lugs 12 at the center of the cylindrical battery core 2 can not contact the current collecting piece 3 due to the length problem, so that the effect of current transmission of the current collecting piece 3 is reduced, the length of the lug 121 at the end part of the pole piece 1 is longer than that of the lug 12 at the middle part, the lugs 12 at the edge of the cylindrical battery core 2 and the lugs 12 at the center of the cylindrical battery core 2 can contact the current collecting piece 3 after the cylindrical battery core 2 is formed, the kneading plane contact stability of the current collecting piece 3 and the cylindrical battery core 2 is enhanced, and the conductive effect of the cylindrical battery is further improved.
In order to ensure that the tab 12 at the edge of the cylindrical battery cell 2 can contact the periphery of the current collecting plate 3, the length of the end tab 121 needs to be ensured, in practice, the specifications of the cylindrical battery cells 2 are different, the perimeter of the edge of the cylindrical battery cell 2 needs to be determined according to the size of the cylindrical battery cell, and the length of the end tab 121 in the length direction of the pole piece 1 and the width extending from the edge of the pole piece 1 are determined according to the size of the through hole of the cylindrical battery cell 2 and the size of the current collecting plate 3. The length of the pole piece 1 of each cylindrical cell 2 is determined, and the perimeter of the edge of the cylindrical cell 2 and the length of the pole tab 12 in the center of the through hole can be determined according to the length of the pole piece 1, so as to determine the width or length ratio of the end pole tab 121 and the middle pole tab 122, preferably, the length ratio of the end pole tab 121 to the middle pole tab 122 ranges from 0.05 to 0.2, and the width of the end pole tab 121 extending from the edge of the pole piece body 11 and the width ratio of the middle pole tab 122 extending from the edge of the pole tab body 12 range from 2 to 5.
It can be understood that after the pole piece 1 is wound into the cylindrical battery cell 2, one of the end tabs 121 is located near the through hole in the center of the cylinder, and the other is located at the edge of the cylindrical battery cell 2, the length and width of the two end tabs 12 may not be consistent, and the end tab 121 at the edge generally needs to be longer than the length or width of the tab 12 near the through hole of the cylindrical battery cell 2. Two end tabs 121 are defined as a first end tab 1211 and a second end tab 1212, the first end tab 1211 is located at the edge of the cylindrical battery cell 2, the second end tab 1212 is located near the through hole of the cylindrical battery cell 2, and the length of the first end tab 1211 along the length direction of the pole piece body 11 is greater than the length of the second end tab 1212 along the length direction of the pole piece body 11. Preferably, the ratio of the length of the first end tab 1211 in the length direction of the pole piece body 11 to the length of the middle tab 122 in the length direction of the pole piece body 11 ranges from 0.05 to 0.2. Optionally, the ratio of the length of the second end tab 1212 in the length direction of the pole piece body 11 to the length of the middle tab 122 in the length direction of the pole piece body 11 ranges from 0.05 to 0.2.
The utility model also relates to a cylindrical battery cell 2, wherein the cylindrical battery cell 2 comprises the cylindrical battery cell 2 and two current collecting plates 3. The cylindrical core body is formed by winding the two pole pieces 1 and the diaphragm arranged between the two pole pieces 1 along the extending direction of one side of the pole piece body 11, so that the two pole lugs 12 are respectively positioned at two axial ends of the cylindrical core body. Specifically, winding is started from the second end tab 1212 to the first end tab 1211, so that the second end tab 1212 is located at the through hole at both ends of the cylindrical cell 2 and the first end tab 1211 is located at the edge of both ends of the cylindrical cell 2. The two current collecting plates 3 are respectively positioned at two ends of the cylindrical battery core 2 and respectively connected to the lugs 12 at two axial ends of the cylindrical core, namely, the lug 12 is rolled by a press roll to form a kneading plane. Specifically, the cylindrical battery comprises the cylindrical battery core 2 and the steel shell. The steel casing includes the lateral wall and the top cap of bottom, cylinder for the cylinder, and bottom and top cap are connected in the both ends of lateral wall, and cylinder electricity core 2 is installed in the steel casing, and bottom and top cap are connected respectively to two current collector pieces 3, specifically, one of them current collector piece 3 connects the utmost point post on the top cap, and utmost point post and top cap pass through insulating material and insulate.
Optionally, the two current collecting sheets 3 include a first current collecting sheet and a second current collecting sheet, the first current collecting sheet includes a current collecting sheet body 31 and an adaptor sheet 32, and one end of the adaptor sheet 32 is connected to one side of the current collecting sheet body 31 away from the cylindrical core body. In practice, the current collecting plate 3 at the negative electrode is directly connected to the casing, the current collecting plate 3 at the positive electrode needs to be insulated from the casing, a pole column is generally arranged on the casing at the positive electrode, the pole column and the casing are insulated by an insulating material, and the current collecting plate 3 at the positive electrode is provided with an adapter plate 32 which is connected to the pole column through the adapter plate 32. Specifically, this cylinder battery includes cylinder electricity core 2 and box hat, and the box hat is the cylinder and includes bottom, the lateral wall and the top cap of cylinder, and bottom and top cap are connected in the both ends of lateral wall, and cylinder electricity core 2 is installed in the box hat, and first current collector is connected in the anodal utmost point ear 12 of cylinder electricity core 2 and is located the position that is close to the top cap, and second current collector is connected in the negative pole utmost point ear 12 of cylinder electricity core 2 and is located the position that is close to the bottom. The top cover is provided with a pole, the first current collecting piece is positioned at one end close to the top cover, and the adapter piece 32 is connected with the pole; the second current collecting piece is positioned at one end close to the bottom cover and connected to the bottom cover.
According to the utility model, the length of the end tab 121 of the pole piece 1 is changed, and the guide effect and welding stability of the current collecting piece 3 of the cylindrical battery are increased and changed, so that the conductivity of the battery can be enhanced, and the quality of the battery is improved.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the utility model can be effected therein by those skilled in the art after reading the above teachings of the utility model. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (9)
1. A pole piece, comprising:
the pole piece body is in a long strip shape;
the utmost point ear, utmost point ear is followed pole piece body one side is extended and is formed, utmost point ear includes two tip utmost point ears and middle part utmost point ear, the tip utmost point ear is in the both ends of pole piece body connect in pole piece body one side, middle part utmost point ear is in the middle part of pole piece body connect in pole piece body one side, two the tip utmost point ear is followed the length that pole piece body one side was extended is greater than the length that middle part utmost point ear was extended.
2. The pole piece of claim 1 wherein the pole piece is applied to a cylindrical battery with the ratio of the width of the end tab extending from the edge of the pole piece body to the width of the middle tab extending from the edge of the tab body ranging from 2 to 5.
3. The pole piece of claim 1 wherein the two pieces of end tabs comprise a first end tab and a second end tab, the first end tab having a length along the length of the pole piece body that is greater than the length of the second end tab along the length of the pole piece body.
4. The pole piece of claim 3 wherein a ratio of a length of the first end tab along the length of the pole piece body to a length of the middle tab along the length of the pole piece body ranges from 0.05 to 0.2.
5. The pole piece of claim 3 wherein the ratio of the length of the second end tab along the length of the pole piece body to the length of the middle tab along the length of the pole piece body ranges from 0.05 to 0.2.
6. A cylindrical electrical core, comprising:
a cylindrical core body formed by winding the two pole pieces of claim 1 and a diaphragm arranged between the two pole pieces along an extending direction of one side of the pole piece body, so that the two pole lugs are respectively positioned at two axial ends of the cylindrical core body;
and the two current collecting pieces are respectively connected to the lugs at the two axial ends of the cylindrical core body.
7. The cylindrical battery cell of claim 6, wherein the two current collectors include a first current collector and a second current collector, the first current collector includes a current collector body and an adaptor, and one end of the adaptor is connected to a side of the current collector body away from the cylindrical core.
8. A cylindrical battery, characterized in that the cylindrical battery comprises:
the cylindrical cell of claim 6;
the steel casing, the steel casing includes the lateral wall and the top cap of bottom, cylinder, the bottom with the top cap connect in the both ends of lateral wall, cylinder electricity core install in the steel casing, two the current collector is connected respectively the bottom with the top cap.
9. A cylindrical battery, characterized in that the cylindrical battery comprises:
the cylindrical cell of claim 7;
the battery comprises a steel shell, a battery body and a battery cover, wherein the steel shell comprises a bottom cover, a cylindrical side wall and a top cover, the bottom cover and the top cover are connected to two ends of the side wall, a cylindrical battery cell is installed in the steel shell, and the top cover is provided with a pole;
the first current collecting piece is positioned at one end close to the top cover, and the adapter piece is connected to the pole;
the second current collecting piece is positioned at one end close to the bottom cover and connected to the bottom cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123218113.3U CN216793947U (en) | 2021-12-20 | 2021-12-20 | Pole piece, cylindrical battery core and cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123218113.3U CN216793947U (en) | 2021-12-20 | 2021-12-20 | Pole piece, cylindrical battery core and cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216793947U true CN216793947U (en) | 2022-06-21 |
Family
ID=82008574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123218113.3U Active CN216793947U (en) | 2021-12-20 | 2021-12-20 | Pole piece, cylindrical battery core and cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216793947U (en) |
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2021
- 2021-12-20 CN CN202123218113.3U patent/CN216793947U/en active Active
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