CN219226550U - Cell structure - Google Patents
Cell structure Download PDFInfo
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- CN219226550U CN219226550U CN202320011326.9U CN202320011326U CN219226550U CN 219226550 U CN219226550 U CN 219226550U CN 202320011326 U CN202320011326 U CN 202320011326U CN 219226550 U CN219226550 U CN 219226550U
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- 238000003466 welding Methods 0.000 claims abstract description 87
- 239000011888 foil Substances 0.000 claims abstract description 49
- 229910018054 Ni-Cu Inorganic materials 0.000 claims description 3
- 229910018481 Ni—Cu Inorganic materials 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000013461 design Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 101100460844 Mus musculus Nr2f6 gene Proteins 0.000 description 1
- 102100023170 Nuclear receptor subfamily 1 group D member 1 Human genes 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a battery cell structure. The electrode plate comprises an electrode lug welded on the electrode plate, wherein a welding area between the electrode lug and the electrode plate is 〦 -shaped, and an empty foil area of the electrode plate corresponding to the welding area is 〦 -shaped. The upper area of the shape of the welding area 〦 is smaller than or equal to the lower area. The electrode lug welding area-shaped structure in the prior art is designed into a 〦 -shaped structure, the length of the welding area is increased, the height of the welding area is shortened, the mechanical property of the electrode core is improved, and the deformation problem of the electrode core in the later period of circulation is improved.
Description
Technical Field
The utility model relates to the technical field of lithium ion batteries, in particular to a battery cell structure.
Background
In the existing battery core manufacturing technology, a bare battery core is directly placed inside a shell and led out to the outside of the battery core through a transfer welding tab. The transfer welding tab is a metal conductor led out from the positive electrode plate and the negative electrode plate of the battery, and the conventional tab is divided into an Al tab and a Ni tab at present.
Because the battery is in the charge-discharge circulation state for a long time, the welding area between the tab and the pole piece which are deep into the battery can generate larger heat, so that the aging degree of the welding area is accelerated, and the height difference can be generated due to the convenience of the welding area and the peripheral ground for a long time. As shown in fig. 1, a positive electrode welding area 1-1 (or a negative electrode welding area 2-1) between a positive electrode tab 1 (or a negative electrode tab 2) and a positive electrode tab 3 (or a negative electrode tab 4) penetrating into the battery in the prior art is shaped like a letter |. As shown in fig. 2, the structure of the positive electrode blank foil region 3-1 (or the negative electrode blank foil region 4-1) corresponds to the structure of the positive electrode welding region 1-1 (or the negative electrode welding region 2-1) in the prior art, and is also in the shape of |. The longer the tab goes deep into the length of the winding core, the larger the height difference area of the welding area is, the deformation can occur in the height difference area of the welding area after long-term charge and discharge circulation, and even when fatigue safety tests (such as a roller, a drop and a micro drop) are carried out for many times, the fracture situation can occur in the height difference area of the welding area, so that the battery cell has no voltage, infinite internal resistance and other phenomena.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a battery cell structure, wherein the welding area-shaped structure of the lug in the prior art is designed into a 〦 -shaped structure, the length of the welding area is increased, the height of the welding area is shortened, the mechanical property of the battery cell is improved, and the problem of deformation of the battery cell easily occurs in the later period of circulation is solved.
In order to achieve the above purpose, the battery cell structure designed by the utility model comprises a tab welded on a pole piece, and is characterized in that: the welding area between the tab and the pole piece is 〦 -shaped, and the empty foil area of the pole piece corresponding to the welding area is 〦 -shaped.
Further, the upper area of the welding area 〦 is smaller than or equal to the lower area.
Furthermore, the upper length and the height of the shape of the blank foil area 〦 are larger than those of the welding area 〦, and the lower length and the height of the shape of the blank foil area 〦 are larger than those of the welding area 〦.
Further, the tab is a positive tab, the pole piece is a positive pole piece, the welding area is a positive welding area, and the empty foil area is a positive empty foil area.
Further, the positive tab is an Al tab.
Further, the tab is a negative tab, the pole piece is a negative pole piece, the welding area is a negative electrode welding area, and the empty foil area is a negative electrode empty foil area.
Further, the negative electrode lug is a Ni electrode lug or a Ni-Cu electrode lug.
The beneficial effects of the utility model are as follows:
1. according to the utility model, the welding area of the electrode lug shaped like the Chinese character 'i' in the prior art is designed into the shape of 〦, so that the length of the welding area is increased, the welding point parallel to the length direction of the electrode piece can be counteracted with impact force received by collision and drop in the using process of the battery cell, the welding tension parallel to the length direction of the electrode piece is increased, and the mechanical property of the battery cell is improved; the height of the welding area of the electrode lug is greatly shortened, the length of the electrode lug penetrating into the winding core is reduced, and the deformation problem and the deformation proportion of the battery core which are easy to occur in the later period of circulation are improved;
2. according to the utility model, the lug welding area adopts a 〦 -shaped structure, the upper area of the lug welding area is smaller than or equal to the lower area, and the overcurrent design is ensured;
3. the electrode plate empty foil area adopts a structural design corresponding to the 〦 -shaped structure of the electrode lug welding area, and compared with the i-shaped structure of the electrode plate empty foil area in the prior art, the 〦 -shaped structure has a total area smaller than the i-shaped structure, so that the area of active material coating on the electrode plate is increased, and the energy density of the battery cell is increased;
the electrode lug welding area-shaped structure in the prior art is designed into a 〦 -shaped structure, the length of the welding area is increased, the height of the welding area is shortened, the mechanical property of the electrode core is improved, and the deformation problem of the electrode core in the later period of circulation is improved.
Drawings
FIG. 1 is a schematic diagram of a welding area between a tab and a pole piece penetrating into the battery in the prior art;
FIG. 2 is a schematic diagram of the structure of an empty foil area of a pole piece in the prior art;
FIG. 3 is a schematic view of the welding area between the tab and the pole piece penetrating into the battery;
FIG. 4 is a schematic view of the structure of the empty foil area of the pole piece of the present utility model;
FIG. 5 is an enlarged view of a portion of FIG. 4;
in the figure: positive electrode tab 1, negative electrode tab 2, positive electrode tab 3, and negative electrode tab 4;
the positive electrode tab 1 includes: positive electrode welding area 1-1;
the negative electrode tab 2 includes: a cathode welding area 2-1;
the positive electrode sheet 3 includes: a positive electrode empty foil area 3-1;
the negative electrode tab 4 includes: negative electrode blank foil area 4-1.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise. "plurality" means "two or more".
As shown in fig. 3-5, the battery cell structure comprises a tab welded on a pole piece, wherein a welding area between the tab and the pole piece is 〦 -shaped, and an empty foil area of the pole piece corresponding to the welding area is 〦 -shaped.
Specifically, the cell structure comprises a positive electrode lug 1 welded on a positive electrode plate 3 and a negative electrode lug 2 welded on a negative electrode plate 4. The positive electrode welding area 1-1 between the positive electrode lug 1 and the positive electrode plate 3 is 〦 -shaped, and the negative electrode welding area 2-1 between the negative electrode lug 2 and the negative electrode plate 4 is 〦 -shaped; the positive electrode plate 3 is 〦 -shaped corresponding to a positive electrode empty foil area 3-1 of the positive electrode welding area 1-1, and the negative electrode plate 4 is 〦 -shaped corresponding to a negative electrode empty foil area 4-1 of the negative electrode welding area 2-1.
According to the utility model, the positive electrode welding area 1-1 and the negative electrode welding area 2-1 in the shape of the I in the prior art are designed to be 〦, the length of the positive electrode welding area 1-1 and the length of the negative electrode welding area 2-1 are increased by the 〦 -shaped structure, so that welding spots parallel to the length direction of the electrode plate can be counteracted with impact forces received by collision and falling in the using process of the battery cell, the welding tension parallel to the length direction of the electrode plate is increased, and the mechanical property of the battery cell is improved; and 〦 style of calligraphy structure shortens anodal welded zone 1-1 and negative pole welded zone 2-1 height greatly, reduces anodal ear 1 and negative pole ear 2 and gets deep into the length of rolling up the core, improves the deformation problem that the electric core appears easily in the later stage of circulation, and deformation proportion.
Preferably, the upper area of the welding area 〦 is smaller than or equal to the lower area.
Specifically, the upper area of the positive electrode welding area 1-1 〦 is smaller than or equal to the lower area, and the upper area of the negative electrode welding area 2-1 〦 is smaller than or equal to the lower area, so that the overcurrent design is ensured.
Preferably, the upper length and the height of the shape of the blank foil area 〦 are larger than those of the welding area 〦, and the lower length and the height of the shape of the blank foil area 〦 are larger than those of the welding area 〦. In general, a welded positive electrode empty foil area 3-1 is reserved on the positive electrode plate 3, and a welded negative electrode empty foil area 4-1 is reserved on the negative electrode plate 4.
Specifically, the upper length and the height of the 3-1 〦 -shaped positive electrode blank foil area are larger than the upper length and the height of the 1-1 〦 -shaped positive electrode welding area, and the lower length and the height of the 3-1 〦 -shaped positive electrode blank foil area are larger than the lower length and the height of the 1-1 〦 -shaped positive electrode welding area; the length and the height of the upper part of the shape of the negative electrode blank foil area 4-1 〦 are both larger than those of the upper part of the shape of the negative electrode welding area 2-1 〦, and the length and the height of the lower part of the shape of the negative electrode blank foil area 4-1 〦 are both larger than those of the lower part of the shape of the negative electrode welding area 2-1 〦.
In the existing structural design, the length of the 3-1 〦 -shaped upper part (or the 4-1 〦 -shaped upper part) of the positive electrode blank foil area is 2-4 mm longer than that of the 1-1 〦 -shaped upper part (or the 2-1 〦 -shaped upper part) of the positive electrode welding area, and the height of the 3-1 〦 -shaped upper part (or the 4-1 〦 -shaped upper part) of the positive electrode blank foil area is 1-2 mm higher than that of the 1-1 〦 -shaped upper part (or the 2-1 〦 -shaped upper part) of the positive electrode welding area; the length of the lower part of the shape of the positive electrode blank foil area 3-1 〦 (or the lower part of the shape of the negative electrode blank foil area 4-1 〦) is 2-4 mm longer than that of the lower part of the shape of the positive electrode welding area 1-1 〦 (or the lower part of the shape of the negative electrode welding area 2-1 〦), and the height of the lower part of the shape of the positive electrode blank foil area 3-1 〦 (or the lower part of the shape of the negative electrode blank foil area 4-1 〦) is 1-2 mm higher than that of the lower part of the shape of the positive electrode welding area 1-1 〦 (or the lower part of the shape of the negative electrode welding area 2-1 〦).
As shown in fig. 5, the upper part of the positive electrode blank foil area 3-1 (or the negative electrode blank foil area 4-1) 〦 is shaped like a letter D, the height is H, and the upper part of the 〦 is shaped like a letter d×h; the lower part of the positive electrode empty foil area 3-1 (or the negative electrode empty foil area 4-1) is 〦 in a shape of d, the height is h, and the lower area of the 〦 is d multiplied by h. In order to ensure the design of the overcurrent, the size requirements of the positive electrode empty foil area 3-1 and the negative electrode empty foil area 4-1 meet the following relation: d.times.h.gtoreq.DXH.
In addition, the positive electrode empty foil area 3-1 (or the negative electrode empty foil area 4-1) adopts a structural design corresponding to the 〦 -shaped structure of the positive electrode welding area 1-1 (or the negative electrode welding area 2-1), and compared with the i-shaped structure of the empty foil area of the pole piece in the prior art, the 〦 -shaped structure has a total area smaller than the i-shaped structure, so that the area coated by active substances on the positive electrode pole piece 3 (or the negative electrode pole piece 4) is increased, and the energy density of the battery cell is increased.
Specifically, the positive tab 1 is an Al tab. The negative electrode lug 2 is a Ni electrode lug or a Ni-Cu electrode lug.
The electrode lug welding area-shaped structure in the prior art is designed into a 〦 -shaped structure, the length of the welding area is increased, the height of the welding area is shortened, the mechanical property of the electrode core is improved, and the deformation problem of the electrode core in the later period of circulation is improved.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (7)
1. The utility model provides an electricity core structure, includes the utmost point ear of welding on the pole piece, its characterized in that: the welding area between the tab and the pole piece is 〦 -shaped, and the empty foil area of the pole piece corresponding to the welding area is 〦 -shaped.
2. The cell structure of claim 1, wherein: the upper area of the shape of the welding area 〦 is smaller than or equal to the lower area.
3. The cell structure of claim 2, wherein: the length and the height of the upper part of the shape of the blank foil area 〦 are both larger than those of the upper part of the shape of the welding area 〦, and the length and the height of the lower part of the shape of the blank foil area 〦 are both larger than those of the lower part of the shape of the welding area 〦.
4. A cell structure according to claim 3, wherein: the electrode lug is an anode electrode lug (1), the electrode plate is an anode electrode plate (3), the welding area is an anode welding area (1-1), and the empty foil area is an anode empty foil area (3-1).
5. The cell structure of claim 4, wherein: the positive electrode lug (1) is an Al electrode lug.
6. A cell structure according to claim 3, wherein: the electrode lug is a negative electrode lug (2), the electrode piece is a negative electrode piece (4), the welding area is a negative electrode welding area (2-1), and the empty foil area is a negative electrode empty foil area (4-1).
7. The cell structure of claim 6, wherein: the negative electrode lug (2) is a Ni electrode lug or a Ni-Cu electrode lug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320011326.9U CN219226550U (en) | 2023-01-04 | 2023-01-04 | Cell structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320011326.9U CN219226550U (en) | 2023-01-04 | 2023-01-04 | Cell structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219226550U true CN219226550U (en) | 2023-06-20 |
Family
ID=86740427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320011326.9U Active CN219226550U (en) | 2023-01-04 | 2023-01-04 | Cell structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219226550U (en) |
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2023
- 2023-01-04 CN CN202320011326.9U patent/CN219226550U/en active Active
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| GR01 | Patent grant | ||
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