CN216750231U - Lithium ion battery tab and battery - Google Patents
Lithium ion battery tab and battery Download PDFInfo
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- CN216750231U CN216750231U CN202122884320.6U CN202122884320U CN216750231U CN 216750231 U CN216750231 U CN 216750231U CN 202122884320 U CN202122884320 U CN 202122884320U CN 216750231 U CN216750231 U CN 216750231U
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Abstract
The utility model belongs to the technical field of battery production and manufacture, and particularly relates to a lithium ion battery tab and a battery, which comprise a tab body, a tab body and a battery cover, wherein the tab body comprises a first metal belt (1) and a second metal belt (2); first strap (1) with second strap (2) form the integral type structure through hot rolling complex, the naked one side of first strap (1) is used for with the welding of negative pole mass flow body (3), the naked one side of second strap (2) is used for with the welding of positive pole mass flow body (4). The utility model adopts a composite tab structure, can balance the heat productivity of two tabs during external short circuit, controls the temperature rise of the tabs in a safe range and reduces the test failure risk.
Description
Technical Field
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a lithium ion battery tab and a battery.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
When the lithium ion battery is subjected to an external short circuit test, because the internal resistance difference between the anode nickel tab and the cathode aluminum tab is large, the internal resistance of the nickel tab with the same specification is about 2.5 times that of the aluminum tab, under the same current intensity, the temperature rise of the nickel tab is far higher than that of the aluminum tab, and the excessively high temperature rise may cause the diaphragm to be burnt through, thereby causing a short circuit or even thermal runaway in the battery.
SUMMERY OF THE UTILITY MODEL
One of the objects of the present invention is: aiming at the defects of the prior art, the lithium ion battery tab is provided, a composite tab structure is adopted, the heat productivity of two tabs during external short circuit can be balanced, the tab temperature rise is controlled within a safety range, and the test failure risk is reduced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium ion battery tab comprises a tab body, a first metal strip and a second metal strip, wherein the tab body comprises the first metal strip and the second metal strip; the first metal strap with the second metal strap passes through the hot rolling complex and forms integral type structure, the naked one side of first metal strap is used for with the welding of negative pole current collector, the naked one side of second metal strap is used for with the welding of positive pole current collector.
Preferably, the first metal strip is an aluminum strip, and the second metal strip is a nickel strip.
Preferably, the ratio of the thickness of the first metal strip to the second metal strip is 1: 1.
Preferably, the width of the tab body is 5 mm-7 mm.
Preferably, the width of the tab body is 6 mm.
Preferably, the first metal strip and the second metal strip are each 0.1mm thick.
Preferably, the high-temperature green glue is covered on the welding position of the first metal belt and the cathode current collector, and/or the high-temperature green glue is covered on the welding position of the second metal belt and the anode current collector.
The utility model also provides a battery, which comprises the lithium ion battery tab.
The utility model has the beneficial effects that the tab comprises a tab body, a tab body and a tab body, wherein the tab body comprises a first metal belt and a second metal belt; the first metal strap with the second metal strap passes through the hot rolling complex and forms integral type structure, the naked one side of first metal strap is used for with the welding of negative pole current collector, the naked one side of second metal strap is used for with the welding of positive pole current collector. Because the internal resistance difference between the anode nickel tab and the cathode aluminum tab is larger, the internal resistance of the nickel tab with the same specification is about 2.5 times that of the aluminum tab, under the same current intensity, the temperature rise of the nickel tab is far higher than that of the aluminum tab, and the overhigh temperature rise can cause the burning-through of a diaphragm, thereby causing the internal short circuit and even thermal runaway of a battery, therefore, the first metal belt and the second metal belt are heated for a preset time at high temperature, then the baked first metal belt and the baked second metal belt are subjected to composite hot rolling to form a tab body with a two-layer structure, which is beneficial to reducing the temperature rise of the tab body, thereby reducing the external short circuit failure risk, in addition, in order to ensure the welding strength, the exposed surface of the first metal belt is welded after being attached to a cathode current collector, the exposed surface of the second metal belt is welded after being attached to an anode current collector, not only when an external short circuit test is carried out, the heating value of the cathode and the anode is kept consistent basically, the condition that the temperature of a single tab is ultrahigh is avoided, the failure risk is reduced, the stability between the tab body and a current collector is improved, and the probability that the tab body falls off is reduced. The utility model adopts a composite tab structure, can balance the heat productivity of two tabs during external short circuit, controls the temperature rise of the tabs in a safe range and reduces the test failure risk.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic cross-sectional view of a first embodiment of the present invention.
Fig. 2 is a top view of the first embodiment of the present invention.
FIG. 3 is a schematic view of the welding of the first embodiment of the present invention to a cathode.
FIG. 4 is a schematic view of the first embodiment of the present invention and anodic bonding.
Wherein the reference numerals are as follows:
1-a first metal strip;
2-a second metal strip;
3-a cathode current collector;
4-an anode current collector;
5-high temperature green glue.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1 to 4, but the present invention is not limited thereto.
Implementation mode one
The first embodiment will be described with reference to the accompanying drawings 1 to 4
The lithium ion battery tab comprises a tab body, a first electrode and a second electrode, wherein the tab body comprises a first metal belt 1 and a second metal belt 2; the first metal belt 1 and the second metal belt 2 are compounded to form an integral structure through hot rolling, wherein the exposed surface of the first metal belt 1 is used for being welded with a cathode current collector 3, and the exposed surface of the second metal belt 2 is used for being welded with an anode current collector 4.
Because the internal resistance difference between the anode nickel tab and the cathode aluminum tab is larger, the internal resistance of the nickel tab with the same specification is about 2.5 times that of the aluminum tab, under the same current intensity, the temperature rise of the nickel tab is far higher than that of the aluminum tab, and the overhigh temperature rise may cause the burning-through of a diaphragm, thereby causing the internal short circuit and even thermal runaway of the battery, therefore, the first metal belt 1 and the second metal belt 2 are heated for a preset time at high temperature, then the baked first metal belt 1 and the baked second metal belt 2 are subjected to composite hot rolling to form a tab body with a two-layer structure, which is beneficial to reducing the temperature rise of the tab body, thereby reducing the failure risk of the external short circuit, in addition, in order to ensure the welding strength, the exposed surface of the first metal belt 1 is welded after being attached to the cathode current collector 3, the exposed surface of the second metal belt 2 is welded after being attached to the anode current collector 4, not only when the external short circuit test is carried out, the heating value of the cathode and the anode is kept consistent basically, the condition that the temperature of a single tab is ultrahigh is avoided, the failure risk is reduced, the stability between the tab body and a current collector is improved, and the probability that the tab body falls off is reduced.
In the lithium ion battery tab according to the present invention, the first metal strip 1 is an aluminum strip, and the second metal strip 2 is a nickel strip. Specifically, negative pole mass flow body 3 is the aluminium foil, positive pole mass flow body 4 is the copper foil, first strap 1 is the aluminium strip, second strap 2 is the nickel strap, when the cathodic welding, the one side and the aluminium foil laminating of aluminium strip, utmost point ear splice pastes 5 covers of high temperature green glue, when the anodic welding, the one side and the copper foil laminating of nickel strap, utmost point ear splice pastes 5 covers of high temperature green glue, when carrying out outside short circuit test, negative and positive poles calorific capacity keeps unanimous basically, avoid appearing the super high condition of single utmost point ear temperature, reduce the risk of failure.
In the lithium ion battery tab according to the present invention, the ratio of the thicknesses of the first metal strip 1 and the second metal strip 2 is 1: 1. Specifically, the thickness ratio of the first metal strip 1 to the second metal strip 2 is (50 ± 5): (50 ± 5), the thicknesses of the first metal strip 1 and the second metal strip 2 may be the same or different within a tolerance.
In the lithium ion battery tab according to the utility model, a high-temperature green glue 5 is further included, the high-temperature green glue 5 covers the welding position of the first metal belt 1 and the cathode current collector 3, and/or the high-temperature green glue 5 covers the welding position of the second metal belt 2 and the anode current collector 4. The high-temperature green glue 5 serves as a tab glue, plays insulating and heat-insulating roles and can protect a tab body.
The working principle of the utility model is as follows:
when the cathode is welded, one surface of the aluminum strip is attached to the aluminum foil, the lug welding position is attached to the high-temperature green adhesive 5 to cover the high-temperature green adhesive, when the anode is welded, one surface of the nickel strip is attached to the copper foil, the lug welding position is attached to the high-temperature green adhesive 5 to cover the high-temperature green adhesive, when an external short circuit test is carried out, the heat productivity of the cathode and the anode is basically kept consistent, the condition that the temperature of a single lug is ultrahigh is avoided, and the failure risk is reduced.
The method comprises the following specific steps:
a. heating the aluminum base band and the nickel base band at 140 ℃ for 90 min;
b. carrying out composite rolling on the baked aluminum-based belt and the baked nickel-based belt to form a composite belt;
c. and (4) slitting the composite tape, wherein the slitting width is 6 mm.
Second embodiment
The difference from the first embodiment is that: the width of the tab body of the present embodiment is 5mm to 7 mm. The width of the pole lug body is limited, and the phenomenon that the width of the pole lug body is too large, so that the production cost is increased is prevented.
Other structures are the same as those of the first embodiment, and are not described herein again.
Third embodiment
The difference from the first embodiment is that: the width of the tab body of the present embodiment is 6mm, and the thicknesses of the first metal strip 1 and the second metal strip 2 are both 0.1 mm. The width of injecing utmost point ear body is median, satisfies the structure of matching the battery, can also reduce the manufacturing cost of battery, and wherein, the thickness of first strap 1 and second strap 2 can be adjusted according to the structure and the market demand of actual battery, preferably adopts 0.1 mm.
Other structures are the same as those of the first embodiment, and are not described herein again.
Battery with a battery cell
The present invention includes the lithium ion battery tab of embodiments one to three.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art to which the utility model pertains based upon the disclosure and teachings of the above specification. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A lithium ion battery tab, comprising:
the tab body comprises a first metal belt (1) and a second metal belt (2);
first strap (1) with second strap (2) form the integral type structure through hot rolling complex, the naked one side of first strap (1) is used for with the welding of negative pole mass flow body (3), the naked one side of second strap (2) is used for with the welding of positive pole mass flow body (4).
2. The lithium ion battery tab of claim 1, wherein: the first metal belt (1) is an aluminum belt, and the second metal belt (2) is a nickel belt.
3. The lithium ion battery tab of claim 1, wherein: the ratio of the thicknesses of the first metal strip (1) and the second metal strip (2) is 1: 1.
4. The lithium ion battery tab of claim 1, wherein: the width of the tab body is 5-7 mm.
5. The lithium ion battery tab of claim 1, wherein: the width of utmost point ear body is 6 mm.
6. The lithium ion battery tab of claim 1, wherein: the first metal strip (1) and the second metal strip (2) both have a thickness of 0.1 mm.
7. The lithium ion battery tab of claim 1, wherein: the high-temperature green glue (5) is covered at the welding position of the first metal belt (1) and the cathode current collector (3), and/or the high-temperature green glue (5) is covered at the welding position of the second metal belt (2) and the anode current collector (4).
8. A battery, characterized by: comprising the lithium ion battery tab of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884320.6U CN216750231U (en) | 2021-11-23 | 2021-11-23 | Lithium ion battery tab and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884320.6U CN216750231U (en) | 2021-11-23 | 2021-11-23 | Lithium ion battery tab and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216750231U true CN216750231U (en) | 2022-06-14 |
Family
ID=81929458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122884320.6U Active CN216750231U (en) | 2021-11-23 | 2021-11-23 | Lithium ion battery tab and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216750231U (en) |
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2021
- 2021-11-23 CN CN202122884320.6U patent/CN216750231U/en active Active
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