CN214505731U - Utmost point ear structure and lithium cell - Google Patents
Utmost point ear structure and lithium cell Download PDFInfo
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- CN214505731U CN214505731U CN202120835802.XU CN202120835802U CN214505731U CN 214505731 U CN214505731 U CN 214505731U CN 202120835802 U CN202120835802 U CN 202120835802U CN 214505731 U CN214505731 U CN 214505731U
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- tab
- utmost point
- point ear
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a battery protection technology field discloses a utmost point ear structure, including interior utmost point ear, connection piece and outer utmost point ear. One end of the inner lug is connected to the battery core, the other end of the inner lug is connected to the connecting sheet, one end of the connecting sheet, which is not connected with the inner lug, is connected to the outer lug, the inner lug is connected with the connecting sheet in a welding mode, and a welding mark formed by welding the inner lug and the connecting sheet is located on the upper surface or the lower surface of the inner lug and the connecting sheet. When the lithium battery is externally short-circuited, instantaneous large current is generated in the battery, the connecting sheet can be fused, and the welding mark is not clamped between the end face of the inner lug and the end face of the connecting sheet so as to save welding space, so that the phenomenon that the inner lug is too short to break due to the arrangement of the connecting sheet is avoided, and the influence on the normal use of the battery is caused. The utility model also discloses a lithium cell with this utmost point ear structure, when the outside short circuit of lithium cell, the connection piece will be fused to further avoid taking place the lithium cell and catching fire, explosion etc..
Description
Technical Field
The utility model relates to a battery protection technical field especially relates to a utmost point ear structure and lithium cell.
Background
The soft-package lithium battery is widely applied to electric automobiles and energy storage systems due to the advantages of high energy density, small internal resistance, flexible design and the like. However, as the range of applications of batteries is expanded, battery explosion accidents occur occasionally, and a short circuit outside the battery is one of the main causes of battery explosion.
Because the battery is under the condition of external short circuit, battery discharge current increases, leads to electric core to generate heat, and high temperature can make the inside diaphragm shrink of electric core or by destruction completely, causes the inside short circuit of battery to arouse that subsequent battery is on fire and the explosion leads to electric core to generate heat. The battery tab is used as a metal conductor leading out the positive electrode and the negative electrode from the battery cell and is also a necessary contact point when the battery cell is charged and discharged, and the structural design of the tab has important influence on the safety of the soft package battery. Specifically, press from both sides the connection piece through the structure at utmost point ear and establish to form the fusible structure, thereby guarantee the security of electric core when the outside short circuit of battery, but the design of fusing structure has also correspondingly caused the loss of battery inner space utilization, and this can cause utmost point ear welding position and electric core interval short excessively, then takes place the cracked problem of individual inside utmost point ear easily, thereby influences the normal performance of battery.
Therefore, a tab structure and a lithium battery are needed to ensure the safety of the battery cell when the battery is short-circuited externally and to avoid affecting the normal use performance of the battery.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a utmost point ear structure and lithium cell both can realize guaranteeing the security of electric core when the outside short circuit of battery, can avoid again influencing the normal performance of battery.
As the conception, the utility model adopts the technical proposal that:
the utility model provides a tab structure, includes interior utmost point ear, connection piece and outer utmost point ear, the one end of interior utmost point ear is connected in electric core, the other end of interior utmost point ear connect in the connection piece, the connection piece is not connected the one end of interior utmost point ear connect in outer utmost point ear, interior utmost point ear with connection piece welded connection, just interior utmost point ear with the welding impression that the connection piece welding formed is located interior utmost point ear with the upper surface or the lower surface of connection piece.
Further, the solder print is bent toward a side close to the battery cell.
Furthermore, the tab structure further comprises an insulating gasket, and the insulating gasket is clamped between the inner tab and the welding seal.
Further, the inner tab is connected to the positive plate and/or the negative plate of the battery cell.
Further, the connecting piece and the outer pole lug are arranged integrally.
Further, the welding is ultrasonic welding.
Furthermore, the connecting piece is provided with a fusing hole.
Further, the fusing hole is provided in plurality.
Further, still provide a lithium cell, including electric core, plastic-aluminum membrane shell and as above arbitrary utmost point ear structure, electric core, interior utmost point ear with the connection piece all is located in the plastic-aluminum membrane shell, outer utmost point ear partly is located in the plastic-aluminum membrane shell, another part stretches out outside the plastic-aluminum membrane shell.
Further, the lithium battery also comprises a hot melt adhesive arranged on the outer pole lug, and the hot melt adhesive is configured to be capable of bonding the aluminum plastic film shell and the outer pole lug.
The utility model has the advantages that:
the utility model provides a pair of utmost point ear structure, including interior utmost point ear, connection piece and outer utmost point ear, the one end of interior utmost point ear is connected in electric core, and the other end of interior utmost point ear is connected in the connection piece, and the one end of utmost point ear is connected in outer utmost point ear in the connection piece is not connected, interior utmost point ear and connection piece welded connection, and the upper surface or the lower surface of utmost point ear and connection piece are located to the seal of welding that interior utmost point ear and connection piece welding formed. When a short circuit occurs outside the lithium battery, instantaneous large current is generated inside the battery, the connecting sheet can be fused, the welding mark is arranged on the extension surface of the inner lug and the connecting sheet instead of being clamped between the inner lug and the connecting sheet, so that the space of the welding area is saved, the problem that the inner lug is too short due to the arrangement of the connecting sheet to cause the breakage of the individual inner lug is avoided, and the influence on the normal use of the battery due to the arrangement of the connecting sheet is avoided.
The utility model also provides a lithium battery, including electric core, plastic-aluminum membrane shell and foretell utmost point ear structure, when the outside short circuit of battery, the connection piece in the utmost point ear structure will be fused to protect electric core, and then avoid arousing catching fire and the explosion of lithium cell.
Drawings
Fig. 1 is a schematic view of a tab structure according to a first viewing angle provided by the present invention;
fig. 2 is a schematic view of a second viewing angle of the tab structure provided by the present invention.
In the figure:
1. an inner tab; 11. an insulating spacer;
2. connecting sheets; 21. a fuse hole;
3. an outer tab;
4. welding and printing;
5. hot melt adhesive;
6. and (5) battery cores.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to 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" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present embodiment provides a tab structure including an inner tab 1, a connecting tab 2, and an outer tab 3. One end of the inner lug 1 is connected to the electric core 6, the other end of the inner lug 1 is connected to the connecting sheet 2, the end of the connecting sheet 2, which is not connected with the inner lug 1, is connected to the outer lug 3, the inner lug 1 is connected with the connecting sheet 2 in a welding manner, and the welding mark 4 formed by welding the inner lug 1 and the connecting sheet 2 is positioned on the upper surface or the lower surface of the inner lug 1 and the connecting sheet 2. Under this setting, when the short circuit takes place outside the lithium cell, its instantaneous current surpassed and predetermine the upper limit value, and connection piece 2 can be fused to reach the purpose of protection electricity core 6, catch fire and explosion etc. with the lithium cell of effectively avoiding arousing because of the outside short circuit of lithium cell, guarantee the security of lithium cell. Wherein the seal 4 of welding of interior utmost point ear 1 and connection piece 2 is not set up between the terminal surface of utmost point ear 1 and the terminal surface of connection piece 2 including, but set up in the upper surface or the lower surface of utmost point ear 1 and connection piece 2, then be in order to save this welding area's space, avoid because of setting up connection piece 2 and lead to the welding position of interior utmost point ear 1 and electric core 6 interval short, lead to the problem that utmost point ear 1 takes place the fracture in individuality easily, in order to ensure that the utmost point ear structure that this embodiment provided can not cause the influence because of being provided with connection piece 2 to the normal use of lithium cell.
In addition, the welding mark 4 formed by welding the inner tab 1 and the connecting piece 2 is bent toward the side close to the battery cell 6. In consideration of the requirement of the heat sealing process of the lithium battery in the processing process, the welding mark 4 is designed to be bent towards one side close to the battery core 6 during welding, so that the bulges at the welding mark 4 of the inner pole lug 1 and the connecting sheet 2 are gentle, and the bulge problem of the lithium battery caused by the protrusion of the welding mark 4 is relieved.
Further, the tab structure further comprises an insulating gasket 11 sandwiched between the inner tab 1 and the welding seal 4. The setting of insulating pad 11 can play certain supporting role to seal 4, avoids when carrying out the heat-seal to electric core 6 and utmost point ear structure etc. seal 4 causes the fracture because of receiving the exogenic action to influence the welding effect of utmost point ear structure.
It should be noted that the tab structure may be used for the positive electrode of the battery cell 6, and may also be used for the negative electrode of the battery cell 6. Specifically, in the present embodiment, the inner tab 1 is connected to the positive electrode tab or the negative electrode tab of the battery cell 6. On the premise of optimizing the process, the tab structure provided in this embodiment is only selectively disposed on the positive electrode or the negative electrode of the battery cell 6, and the conventional tab is disposed on the negative electrode or the positive electrode of the battery cell 6 that is not provided with the tab structure, which still can achieve the purpose of protecting the battery cell 6 from ignition or explosion of the battery when the battery is short-circuited externally. However, in another embodiment, the tab structure may be provided at both the positive electrode and the negative electrode of the battery cell 6, that is, the inner tab 1 is connected to the positive electrode sheet and the negative electrode sheet of the battery cell 6.
Optionally, in the present embodiment, the connecting sheet 2 and the outer tab 3 are integrally provided. The thickness of the connecting piece 2 and the width perpendicular to the extending direction of the connecting piece 2 are consistent with the outer tab 3, the length of the connecting piece 2 can be different from that of the outer tab 3, and the lengths of the connecting piece 2 and the outer tab can be adjusted according to actual conditions.
Optionally, in this embodiment, ultrasonic welding is adopted between the inner tab 1 and the connecting plate 2.
Furthermore, in order to ensure that the connecting piece 2 can be fused in time when short circuit occurs, in the embodiment, the connecting piece 2 is provided with a fusing hole 21.
And a plurality of fusing holes 21 are provided in order to secure the fusing effect. The number, shape and area of the fusing holes 21 may be varied according to actual design requirements. In the present embodiment, to ensure the convenience of processing, the fusing hole 21 is preferably a circular hole. Of course, in other embodiments, the fusing hole 21 may be designed as a rectangular hole, a diamond hole, or the like. The sum of the cross-sectional areas of the fusing holes 21 is preferably 30% to 50% of the cross-sectional area of the connecting tab 2 so that the connecting tab 2 may be fused when the internal current of the battery becomes slightly large. In addition, the position of the fusing hole 21 is set, so that the linear distance between the inner tab 1 and the outer tab 3 of the edge distance of each fusing hole 21 is greater than or equal to 0.5mm, namely, the connecting piece 2 is ensured to be not easily broken on the premise of ensuring the fusing effect of the connecting piece 2, and the normal use function of the lithium battery is not influenced.
The embodiment also provides a lithium battery, which comprises a battery core 6, an aluminum plastic film shell and the tab structure. The battery core 6, the inner electrode lug 1 and the connecting piece 2 are all positioned in the aluminum-plastic film shell, one part of the outer electrode lug 3 is positioned in the aluminum-plastic film shell, and the other part of the outer electrode lug extends out of the aluminum-plastic film shell.
In order to realize the sealing effect of the aluminum plastic film shell on other parts of the lithium battery, the lithium battery provided by the embodiment further comprises a hot melt adhesive 5 arranged on the outer tab 3, and the aluminum plastic film shell and the outer tab 3 can be bonded by the hot melt adhesive 5. Specifically, hot melt adhesive 5 encircles and locates outer utmost point ear 3 surfaces, and under hot pressing technology, the part that contains hot melt adhesive 5 on outer utmost point ear 3 can be in the same place with the inlayer of plastic-aluminum membrane shell bonding under the hot pressing, and then all seals electric core 6, interior utmost point ear 1 and connection piece 2 inside the plastic-aluminum membrane shell.
The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a tab structure, its characterized in that, includes interior utmost point ear (1), connection piece (2) and outer utmost point ear (3), the one end of interior utmost point ear (1) is connected in electric core (6), the other end of interior utmost point ear (1) connect in connection piece (2), connection piece (2) are not connected the one end of interior utmost point ear (1) connect in outer utmost point ear (3), interior utmost point ear (1) with connection piece (2) welded connection, just interior utmost point ear (1) with welding impression (4) that connection piece (2) welded and formed are located interior utmost point ear (1) with the upper surface or the lower surface of connection piece (2).
2. The tab structure of claim 1, wherein the weld (4) is bent toward a side adjacent to the cell (6).
3. The tab structure as claimed in claim 2, further comprising an insulating gasket (11), wherein the insulating gasket (11) is sandwiched between the inner tab (1) and the weld stamp (4).
4. The tab structure of claim 1, wherein the inner tab (1) is connected to a positive tab and/or a negative tab of the battery cell (6).
5. A tab structure as claimed in claim 1, characterized in that the connecting tab (2) is provided integrally with the outer tab (3).
6. A tab structure as claimed in claim 1, wherein the welding is ultrasonic welding.
7. The tab structure as claimed in claim 1, wherein the connecting piece (2) is provided with a fusing hole (21).
8. The tab structure as claimed in claim 7, wherein the fusing hole (21) is provided in plurality.
9. A lithium battery, comprising an electric core (6), an aluminum-plastic film casing and the tab structure of any one of claims 1 to 8, wherein the electric core (6), the inner tab (1) and the connecting piece (2) are all located in the aluminum-plastic film casing, and one part of the outer tab (3) is located in the aluminum-plastic film casing and the other part of the outer tab extends out of the aluminum-plastic film casing.
10. A lithium battery as claimed in claim 9, characterized in that it further comprises a hot melt adhesive (5) provided on the external tab (3), the hot melt adhesive (5) being configured to enable bonding of the aluminum plastic film casing and the external tab (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120835802.XU CN214505731U (en) | 2021-04-22 | 2021-04-22 | Utmost point ear structure and lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120835802.XU CN214505731U (en) | 2021-04-22 | 2021-04-22 | Utmost point ear structure and lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214505731U true CN214505731U (en) | 2021-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120835802.XU Active CN214505731U (en) | 2021-04-22 | 2021-04-22 | Utmost point ear structure and lithium cell |
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| Country | Link |
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| CN (1) | CN214505731U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188673A (en) * | 2021-12-09 | 2022-03-15 | 远景动力技术(江苏)有限公司 | Naked electric core, electric core and electronic equipment |
| WO2024159413A1 (en) * | 2023-01-31 | 2024-08-08 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
-
2021
- 2021-04-22 CN CN202120835802.XU patent/CN214505731U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188673A (en) * | 2021-12-09 | 2022-03-15 | 远景动力技术(江苏)有限公司 | Naked electric core, electric core and electronic equipment |
| CN114188673B (en) * | 2021-12-09 | 2024-03-19 | 远景动力技术(江苏)有限公司 | Battery cell and electronic equipment |
| WO2024159413A1 (en) * | 2023-01-31 | 2024-08-08 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric device |
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