CN212011123U - Liquid leakage prevention tab of soft package lithium ion battery cell - Google Patents
Liquid leakage prevention tab of soft package lithium ion battery cell Download PDFInfo
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- CN212011123U CN212011123U CN202021057115.1U CN202021057115U CN212011123U CN 212011123 U CN212011123 U CN 212011123U CN 202021057115 U CN202021057115 U CN 202021057115U CN 212011123 U CN212011123 U CN 212011123U
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- tab
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- lug
- battery cell
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A soft-packaged lithium ion battery cell leakage-proof liquid tab is characterized in that two tab glue grooves extending along the length direction are symmetrically arranged in heat-sealing areas on the front side and the back side of a tab body, the tab body is divided into an upper tab part positioned outside a soft-packaged battery cell and a lower tab part positioned inside the soft-packaged battery cell through the tab glue grooves, the thicknesses of the upper tab part and the lower tab part are the same, the left side and the right side of the tab glue groove extend outwards to form a left tab wing and a right tab wing, the distance between the bottoms of the two tab glue grooves is the same as the thicknesses of the left tab wing and the right tab wing, the thicknesses are half of the thicknesses of the upper tab part and the lower tab part, and the widths; the width of the tab glue layer is greater than the tab left wing and the tab right wing and less than the width of the tab glue groove; the length of the tab glue layer is greater than the total length between the tab left wing and the tab right wing; the total thickness of the two tab glue layers bonded with the tab body exceeds the thickness of the upper portion of the tab by 0-30%; and the risk of battery leakage of the soft package battery in the subsequent use process is reduced.
Description
Technical Field
The utility model belongs to the technical field of soft packet of lithium ion battery makes and specifically relates to a soft packet of lithium ion battery cell leak protection liquid utmost point ear is related to.
Background
In the manufacturing process of the existing soft package lithium ion battery, the battery cell packaging has a great influence on the quality of a finished product of the battery cell, particularly, the top edge of the soft package battery cell is subjected to heat sealing, namely top sealing, an outer tab (with tab glue) needs to be melted and sealed with a pp layer of an outer packaging aluminum-plastic film in a heat sealing mode, so that the inside of the battery cell is isolated from the outside, and external air and moisture are prevented from entering the battery cell; meanwhile, electrolyte is prevented from leaking to the outside of the battery core. However, because the outer tab generally adopts a structure combining a strip-shaped metal conducting strip and tab glue, when the square groove heat sealing head is used for heat sealing, glue overflows from the steps at the two ends of the tab in the heat sealing area due to the inherent thicknesses of the metal conducting strip and the tab glue, so that the metal conducting strip and the tab glue become a weak packaging part and become a high-risk liquid leakage area in the subsequent use process of the battery cell. The leakage at the step of the tab is the most common condition in the poor leakage of the soft package lithium ion battery.
Disclosure of Invention
An object of the utility model is to improve the above-mentioned not enough of prior art and provide a soft packet of lithium ion battery cell leakage prevention liquid utmost point ear, can avoid utmost point ear heat-seal region step department both ends utmost point ear to glue the overflowed glue, reduce the battery weeping risk in follow-up electric core use.
A soft package lithium ion cell leakage-proof liquid tab comprises a tab body and two tab glue layers bonded on the tab body;
the heat-sealing areas on the front side and the back side of the tab body are symmetrically provided with two tab glue grooves which extend along the length direction and are used for bonding tab glue layers, the tab body is divided into an upper tab part positioned outside a soft-package battery core and a lower tab part positioned inside the soft-package battery core through the tab glue grooves, the thicknesses of the upper tab part and the lower tab part are the same, the left side and the right side of the tab glue groove extend outwards to form a left tab wing and a right tab wing, the distance between the bottoms of the two tab glue grooves is the same as the thicknesses of the left tab wing and the right tab wing, and is half of the thicknesses of the upper tab part and the lower tab part, and the widths of the two;
the width of the tab glue layer is greater than the tab left wing and the tab right wing and less than the width of the tab glue groove; the length of the tab glue layer is greater than the total length between the tab left wing and the tab right wing; the total thickness of the two tab glue layers bonded with the tab body exceeds the thickness of the upper portion of the tab by 0-30%.
The left side line of the tab left wing, the right side line of the tab right wing and the corresponding upper and lower edges are in smooth transition, and the tab glue layer is prevented from being damaged by the sharp-angled structure under the action of external force.
And fillets are arranged between the left side line of the left wing of the lug, the right side line of the right wing of the lug and the corresponding upper and lower edges, and the radius of each fillet is 0.5-3 mm.
Chamfers are arranged between the left side line of the left wing of the pole lug, the right side line of the right wing of the pole lug and the corresponding upper and lower edges, the width of each chamfer is 0.2mm-1mm, and the angle is 30-55 degrees.
And the upper part of the lug and the left and right ends of the lower part of the lug are provided with fillets with the radius of 1-3 mm.
The thicknesses of the upper part and the lower part of the tab are 0.3mm-2 mm; the distance between the bottoms of the two tab glue grooves and the thickness of the tab left wing and the tab right wing are 0.15mm-1 mm.
After the tab glue layers are bonded, the vertical distance from the upper edge of the tab glue layer to the upper edge of the tab glue groove is more than or equal to 0.5mm, and the vertical distance from the lower edge of the tab glue layer to the lower edge of the tab glue groove is more than or equal to 0.5 mm.
After the lug glue layers are bonded, the vertical distance between the upper edges of the lug glue layers and the upper ends of the left wing and the right wing of the lug is more than or equal to 1mm, the vertical distance between the lower edges of the lug glue layers and the lower ends of the left wing and the right wing of the lug is more than or equal to 1mm, the vertical distance between the left end of the lug glue layer and the left wing of the lug is 2mm-8mm, and the vertical distance between the right end of the lug glue layer and the right wing of the lug is 2 mm.
The vertical distance from the upper edge of the tab glue groove to the upper ends of the tab left wing and the tab right wing is 1mm-2.5 mm; the vertical distance from the lower edge of the tab glue groove to the lower ends of the tab left wing and the tab right wing is 1mm-2.5 mm.
The lug body, the lug left wing and the lug right wing are metal conducting strips; the tab glue layer is made of one or more materials of PP, PE and PVC.
The beneficial effects of the utility model reside in that: compared with the prior pole ear, the utility model can avoid the glue overflow of the pole ear glue at the two ends of the step of the pole ear heat-sealing area by changing the thickness of the metal conducting strip (namely, the pole ear glue groove) of the heat-sealing area, and reduce the thickness difference between the top-sealing pole ear area and the non-pole ear area; secondly, by adding the left wing and the right wing of the tab, the stress distribution of the battery top sealing area when the battery top sealing area is pulled by external force in the subsequent use process is changed, and the force which is originally concentrated on the junction position of the tab and the aluminum-plastic film is dispersed to the two wings, so that the heat sealing area can bear larger destructive force; finally, the left wing and the right wing of the tab are added, so that the leakage track and the leakage path of the electrolyte are prolonged, the permeation direction of the electrolyte is changed, and the possibility of leakage at the tab position is reduced to the maximum extent.
Drawings
Fig. 1 is a schematic structural view of a tab body of the present invention;
fig. 2 is a front view of the tab body of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 3 at A;
FIG. 4 is a partial enlarged view of FIG. 3 at B;
fig. 5 is a schematic structural diagram of the present invention;
FIG. 6 is a schematic view showing the permeation trace and permeation direction of the electrolyte in the present heat-seal land;
in the figure: 1. the tab upper part, 2, the tab lower part, 3, the tab left wing, 4, the tab right wing, 5, the tab glue groove, 6, the tab glue groove upper edge, 7, the tab glue groove lower edge, 8, the tab glue layer, 9, the tab glue upper edge, 10, the tab glue lower edge, 11, the tab glue left end, 12 and the tab glue right end; 13. top seal heat seal area, 14, electrolyte penetration trace.
Detailed Description
The technical solution in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings, which are simplified schematic drawings and only schematically illustrate the basic structure of the present invention.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
According to fig. 1, 2 and 3, the utility model discloses a utmost point ear body, two utmost point ear glue films 8, utmost point ear body heat-seal area front and back sets up symmetrical utmost point ear glue groove 5, utmost point ear glue groove 5 divides utmost point ear body into utmost point ear upper portion 1, utmost point ear lower part 2, utmost point ear glue groove 5 left and right sides outwards extends to form has utmost point ear left wing 3, utmost point ear right wing 4 integrally formed, utmost point ear upper portion 1, utmost point ear lower part 2, utmost point ear left wing 3, utmost point ear right wing 4 integrally formed structure; the thickness of the upper part 1 of the tab is the same as that of the lower part 2 of the tab, and the thickness ranges are as follows: 0.3mm-2 mm; the left end and the right end of the upper part and the lower part of the tab are rounded, and the radius of the rounded angle is 1-3 mm; the 5 tank bottoms intervals of two utmost point ear glue tanks are the same with utmost point ear left wing 3, 4 thickness three of utmost point ear right flank, and are half of utmost point ear upper portion 1, 2 thicknesses in utmost point ear lower part, thickness scope: 0.15mm-1 mm; the vertical distance from the upper edge 6 of the tab glue groove to the upper ends of the tab left wing 3 and the tab right wing 4 is 1mm-2.5 mm; the vertical distance from the lower edge 7 of the tab glue groove to the lower ends of the tab left wing 3 and the tab right wing 4 is 1mm-2.5 mm; the width of the two tab glue grooves 5 is larger than that of the tab left wing 3 and the tab right wing 4; the tab body, the tab left wing 3 and the tab right wing 4 are metal conducting strips; the width of the tab glue layer 8 is larger than that of the tab left wing 3 and the tab right wing 4 and smaller than that of the tab glue groove 5; the length of the tab glue layer 8 is greater than the total length between the tab left wing 3 and the tab right wing 4; the total thickness of two utmost point ear glue films 8 after bonding with utmost point ear body surpasss 1 thickness on utmost point ear upper portion scope and is 0% -30%, and this design can reduce heat-seal district (utmost point ear glue groove position promptly) thickness, can avoid utmost point ear heat-seal district step department both ends utmost point ear glue to overflow to glue, and it is poor to have reduced the thickness of heat-seal district and utmost point ear upper portion 1, utmost point ear lower part 2, when guaranteeing the heat-seal effect for the regional outward appearance of top seal is more level and more smooth.
According to the illustration of fig. 4, a fillet is arranged between the left sideline of the left wing 3 of the tab, the right sideline of the right wing 4 of the tab and the corresponding upper and lower edges, and the radius of the fillet is 0.5mm-3 mm; the tab compound is not limited to a fillet, and can also be a chamfer or other shapes, so that stress concentration caused by sharp corners (acute angles) on the structure is prevented, and the tab compound is more easily damaged at the position under the action of external force; furthermore, chamfers are arranged between the left side line of the left lug wing 3 and the right side line of the right lug wing 4 and the corresponding upper and lower edges, the width of the chamfers is 0.2mm-1mm, and the angle is 30-55 degrees.
As shown in fig. 5, the tab glue layer 8 is made of one or more materials selected from PP, PE and PVC, which may be transparent, translucent or opaque; the two tab glue layers 8 are bonded in the tab glue grooves 5 on the front and back surfaces of the tab body through adhesives, and then are subjected to hot melting and pressing, so that the tab glue completely wraps and melts the tab left wing 3 and the tab right wing 4 to form sealing, and the tab glue is thoroughly isolated from the outside; the vertical distance from the upper edge 9 of the tab glue layer to the upper edge 6 of the tab glue groove is more than or equal to 0.5mm, and the vertical distance from the lower edge 10 of the tab glue layer to the lower edge 7 of the tab glue groove is more than or equal to 0.5mm, so that a space is reserved for deformation when the tab body and the aluminum-plastic film are melted and heat-sealed; the vertical distance of the upper edge 9 of the tab glue layer protruding out of the left wing and the upper end of the right wing of the tab is more than or equal to 1mm, the vertical distance of the lower edge 10 of the tab glue layer protruding out of the left wing and the lower end of the right wing of the tab is more than or equal to 1mm, the vertical distance of the left end 11 of the tab glue layer protruding out of the left wing of the tab is 2mm-8mm, and the vertical distance of the right end 12 of the tab glue layer protruding out of the right wing of.
As shown in fig. 6, in order to permeate from the tab position, a smooth permeation path is required, wherein the dotted line is an electrolyte permeation track 14, and the black arrow is an electrolyte permeation direction. Compared with the rectangle utmost point ear, the utility model discloses changed the regional atress distribution when receiving external force and dragging in follow-up use of battery top seal, will concentrate on the power dispersion to the two wings of utmost point ear with plastic-aluminum membrane boundary position originally for the heat-seal region can tolerate bigger destructive power, is more difficult to form unblocked infiltration passageway, has changed electrolyte direction of penetration moreover and has prolonged the infiltration orbit, has reduced the possibility that forms unblocked infiltration passageway, and then reaches the prevention of leakage liquid purpose.
The present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes without creative labor from the above conception, and all the changes fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a soft packet of lithium ion cell leak protection liquid utmost point ear which characterized in that: comprises a tab body and two tab glue layers (8) bonded on the tab body;
the heat-sealing areas on the front side and the back side of the tab body are symmetrically provided with two tab glue grooves (5) which extend along the length direction and are used for bonding tab glue layers (8), the tab body is divided into a tab upper part (1) positioned outside a soft-package battery core and a tab lower part (2) positioned inside the soft-package battery core through the tab glue grooves (5), the thicknesses of the tab upper part (1) and the tab lower part (2) are the same, the left side and the right side of the tab glue grooves (5) extend outwards to form a tab left wing (3) and a tab right wing (4), the distance between the bottoms of the two tab glue grooves (5) is the same as the thicknesses of the tab left wing (3) and the tab right wing (4), the distances are half of the thicknesses of the tab upper part (1) and the tab lower part (2), and the widths of the two tab glue grooves;
the width of the tab glue layer (8) is greater than that of the tab left wing (3) and the tab right wing (4) and is less than that of the tab glue groove (5); the length of the tab glue layer (8) is greater than the total length between the tab left wing (3) and the tab right wing (4); the total thickness of the two tab glue layers (8) bonded with the tab body exceeds the thickness of the upper portion (1) of the tab by 0-30%.
2. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: the left side line of utmost point ear left-hand wing (3), the right side line of utmost point ear right flank (4) and correspond between the lower limb smooth transition for prevent that the closed angle structure from leading to damaging utmost point ear glue film (8) when receiving the exogenic action.
3. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 2, characterized in that: and fillets are arranged between the left side line of the lug left wing (3), the right side line of the lug right wing (4) and the corresponding upper and lower edges, and the radius of each fillet is 0.5-3 mm.
4. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 2, characterized in that: chamfers are arranged between the left side line of the tab left wing (3), the right side line of the tab right wing (4) and the corresponding upper and lower edges, the width of each chamfer is 0.2mm-1mm, and the angle is 30-55 degrees.
5. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: and the left and right ends of the upper part (1) and the lower part (2) of the lug are provided with fillets with the radius of 1-3 mm.
6. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: the thicknesses of the upper part (1) and the lower part (2) of the tab are 0.3mm-2 mm; the distance between the bottoms of the two tab glue grooves (5) and the thickness of the tab left wing (3) and the tab right wing (4) are 0.15mm-1 mm.
7. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: after the tab glue layers (8) are bonded, the vertical distance from the upper edges (9) of the tab glue layers to the upper edges (6) of the tab glue grooves is more than or equal to 0.5mm, and the vertical distance from the lower edges (10) of the tab glue layers to the lower edges (7) of the tab glue grooves is more than or equal to 0.5 mm.
8. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 7, characterized in that: after the lug glue layer (8) is bonded, the vertical distance of the upper edge (9) of the lug glue layer protruding out of the left wing and the upper end of the right wing of the lug is more than or equal to 1mm, the vertical distance of the lower edge (10) of the lug glue layer protruding out of the left wing and the lower end of the right wing of the lug is more than or equal to 1mm, the vertical distance of the left end (11) of the lug glue layer protruding out of the left wing of the lug is 2mm-8mm, and the vertical distance of the right end (12) of the lug glue layer protruding out of the.
9. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: the vertical distance from the upper edge (6) of the tab glue groove to the upper ends of the tab left wing (3) and the tab right wing (4) is 1mm-2.5 mm; the vertical distance from the lower edge (7) of the tab glue groove to the lower ends of the tab left wing (3) and the tab right wing (4) is 1mm-2.5 mm.
10. The liquid leakage preventing tab of the soft package lithium ion battery cell of claim 1, characterized in that: the lug body, the lug left wing (3) and the lug right wing (4) are metal conducting strips; the tab glue layer (8) is made of one or more materials of PP, PE and PVC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021057115.1U CN212011123U (en) | 2020-06-10 | 2020-06-10 | Liquid leakage prevention tab of soft package lithium ion battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021057115.1U CN212011123U (en) | 2020-06-10 | 2020-06-10 | Liquid leakage prevention tab of soft package lithium ion battery cell |
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| CN212011123U true CN212011123U (en) | 2020-11-24 |
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| CN202021057115.1U Active CN212011123U (en) | 2020-06-10 | 2020-06-10 | Liquid leakage prevention tab of soft package lithium ion battery cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210036272A1 (en) * | 2017-10-23 | 2021-02-04 | Lg Chem, Ltd. | Rechargeable Battery |
| CN114361735A (en) * | 2022-01-04 | 2022-04-15 | 万向一二三股份公司 | Pole lug metal conductor structure for improving sealing performance of soft package lithium ion battery |
-
2020
- 2020-06-10 CN CN202021057115.1U patent/CN212011123U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210036272A1 (en) * | 2017-10-23 | 2021-02-04 | Lg Chem, Ltd. | Rechargeable Battery |
| CN114361735A (en) * | 2022-01-04 | 2022-04-15 | 万向一二三股份公司 | Pole lug metal conductor structure for improving sealing performance of soft package lithium ion battery |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210901 Address after: 441000 No.18 Wuxi Road, high tech Zone, Xiangyang City, Hubei Province Patentee after: CAMEL GROUP NEW ENERGY CELL Co.,Ltd. Address before: Floor g6-1001, Wuhan New Energy Research Institute building, 999 Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee before: Camel Group Wuhan New Energy Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |