CN202495509U - A flexible packaging lithium-ion power battery tab - Google Patents

Abstract

The utility model belongs to the technical field of lithium ion battery, in particular to soft-packing lithium ion power battery utmost point ear, it includes two piece at least utmost point ear lamellar bodies, and sets up between the utmost point ear lamellar body and setting up the utmost point ear sealant in the utmost point ear lamellar body outside. Compared with the prior art, the utility model discloses flexible package lithium ion power battery utmost point ear is multilayer sandwich structure, under the certain condition of power battery utmost point ear area of overflowing, individual layer utmost point ear lamellar body thickness is 1/n (n is greater than or equal to 2) of design utmost point ear thickness, and n is the integer, and be provided with utmost point ear sealed glue between every layer utmost point ear of piece body, it is in the same place to tightly heat-seal easily when utmost point ear lamellar body and utmost point ear sealed glue hot pressing, the utmost point ear that makes the preparation has good leakproofness and insulating nature, the poor problem of utmost point ear edge leakproofness in having avoided present single thick utmost point ear hot pressing preparation process, thereby the battery weeping and the gas scheduling problem that expands that power type flexible package lithium ion leads to because utmost point ear leakproofness is poor.

Description

A flexible packaging lithium-ion power battery tab

technical field

The utility model belongs to the technical field of lithium-ion batteries, in particular to a soft-packaged lithium-ion power battery tab.

Background technique

With the development of modern society, people's awareness of environmental protection is constantly increasing. In recent years, with the aggravation of environmental pollution and the depletion of traditional energy sources, people are eager to replace traditional energy sources with new clean energy sources. The development of environmentally friendly and clean energy with many advantages such as high platform and low self-discharge rate has become an inevitable trend. Up to now, more and more devices have chosen to use lithium-ion batteries as power sources, such as mobile phones, laptops, MP3 and other portable devices, as well as electric vehicles and energy storage power stations. Among them, lithium-ion batteries used in electric vehicles generally have the characteristics of large capacity.

Lithium-ion power batteries currently used in electric vehicles can be divided into two types according to the shell: one is a hard shell battery, mainly made of metal aluminum or stainless steel; the other is a soft pack battery, mainly made of aluminum-plastic composite film for the shell material. Among them, flexible packaging lithium-ion power batteries are widely used due to their light weight, high mass specific energy and good insulation. Due to the large capacity of the power battery and the large overcurrent of the tabs, the thickness of the tabs of the battery is correspondingly thickened. At present, the tabs used in flexible packaging lithium-ion power batteries are generally a single aluminum sheet or nickel sheet that is integrally formed. Due to the large thickness, there is currently no good way to solve the problems of packaging, sealing and insulation of such tabs. In particular, the edge sealing and insulation of the tabs can easily cause problems such as battery leakage and flatulence.

In view of this, it is indeed necessary to provide a tab structure capable of solving the package sealing and insulation of the soft-packaged lithium-ion power battery, so as to solve and improve the problems of battery leakage and flatulence of the battery.

Utility model content

The purpose of the utility model is to provide a tab structure capable of solving the sealing and insulating properties of the soft-packed lithium-ion power battery in order to solve and improve the problems of battery leakage and flatulence in view of the deficiencies of the prior art .

In order to achieve the above object, the utility model adopts the following technical solutions:

A flexible package lithium-ion power battery tab, which includes at least two tab pieces, and a tab sealant arranged between the tab pieces and outside the tab pieces. The structure of the tab is a multi-layer sandwich integrated structure, and its sequence is tab sealant, tab body, tab sealant..., tab body, tab sealant. Among them, the tab sealant plays the role of bonding the tab body together, and bonding the whole tab with the aluminum-plastic composite film.

As an improvement of the tab of the flexible packaging lithium-ion power battery of the utility model, the thickness of the tab body is 0.1 mm to 0.6 mm. The material of the tab body used is copper sheet, nickel sheet, aluminum sheet, steel sheet, copper alloy sheet, aluminum alloy sheet or steel alloy sheet.

As an improvement of the tab of the flexible package lithium-ion power battery of the utility model, the thickness of the tab sealant is 0.05 mm to 0.3 mm. The material of the lug sealant used is polyethylene, polypropylene, modified polyethylene, modified polypropylene, polytetrafluoroethylene and vinyl acetate, or one or more composite materials.

As an improvement of the tab of the flexible package lithium-ion power battery of the present invention, the length of the tab sealant is greater than the length of the tab body. During packaging, the tab sealant that is longer than the tab body can well bond the tab and the aluminum-plastic composite film used for the soft-packed lithium-ion power battery together by thermal fusion, thus effectively solving the problem of the tab The sealing and insulation of the edge packaging and other issues have greatly improved the reliability and safety of the soft-pack lithium-ion power battery.

As an improvement of the tab of the flexible package lithium-ion power battery of the utility model, the tab body is two pieces.

As an improvement of the tabs of the soft-packaged lithium-ion power battery of the utility model, the tab bodies are three pieces. The tabs of these two structures are relatively convenient to assemble, which is beneficial to improving production efficiency.

As an improvement of the tab of the flexible package lithium-ion power battery of the utility model, the tab sealant is bonded and connected to the tab body by glue or heat fusion.

Compared with the prior art, the tabs of the soft-packed lithium-ion power battery of the utility model have a multi-layer sandwich structure. Under the condition of a certain flow area of the tabs of the power battery, the thickness of the single-layer tab body is 1 of the designed tab thickness. /n (n≥2, and n is an integer), and there is a tab sealant between each layer of the tab body, and the tab body and the tab sealant are easily fused together tightly during hot pressing, so that The produced tab has good sealing and insulation, which avoids the problem of poor sealing of the tab edge in the current single thick tab hot-pressing preparation process, thus effectively solving the problem of poor sealing of the tab for power-type flexible packaging lithium ions. Problems such as battery leakage and flatulence have greatly improved the reliability and safety of the soft-pack lithium-ion power battery.

Description of drawings

Fig. 1 is a sectional view of the utility model;

Fig. 2 is a schematic view of the front structure of the utility model.

Detailed ways

Below in conjunction with specific embodiment and accompanying drawing, the beneficial effect of the present utility model is further described:

As shown in Figures 1 and 2, the utility model is a soft-packed lithium-ion power battery tab, including at least two tab bodies 1, and is arranged between the tab bodies 1 and is arranged on the tab body. Tab sealant 2 on the outside of sheet body 1. The structure of the tab is a multi-layer sandwich integrated structure, and its sequence is tab sealant 2, tab body 1, tab sealant 2..., tab body 1, tab sealant 2. The tab body 1 is equivalent to a sandwich layer.

Wherein, the thickness of the tab body 1 is 0.1 mm to 0.6 mm, and the material of the tab body 1 can be copper sheet, nickel sheet, aluminum sheet, steel sheet, copper alloy sheet, aluminum alloy sheet or steel alloy piece.

The thickness of the lug sealant 2 is 0.05mm-0.3mm. The material of the lug sealant 2 used can be one or more composite materials of polyethylene, polypropylene, modified polyethylene, modified polypropylene, polytetrafluoroethylene and vinyl acetate.

The length of the tab sealant 2 is greater than the length of the tab body 1 .

Preferably, the tab body 1 is two or three pieces.

The tab sealant 2 is bonded and connected to the tab body 1 by glue or heat fusion.

During actual assembly, at least two pieces of tab bodies 1 are prepared first, and then the tab sealant 2 is bonded between the tab bodies 1 and the outside of the tab bodies 1 by glue or heat fusion. Making it present a "sandwich" structure is to complete the assembly of the tabs of the flexible packaging lithium-ion power battery of the present invention, wherein the tab body 1 is equivalent to a sandwich layer.

The assembled tabs are welded on the pole piece of the cell, and after being assembled into a cell by winding or stacking, put the cell into a packaging bag of aluminum-plastic composite film, inject liquid, seal, and package the tab. The part of the tab sealant 2 that is longer than the tab body 1 can well bond the tab and the aluminum-plastic composite film used for the soft-packed lithium-ion power battery by thermal fusion, thus effectively solving the problem of the tab Problems such as package sealing and insulation have greatly improved the reliability and safety of soft-pack lithium-ion power batteries.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (7)

1. A flexible package lithium-ion power battery tab, characterized in that: it comprises at least two tab pieces (1), and is arranged between the tab pieces (1) and on the tab Tab sealant (2) on the outside of the sheet body (1). 2. The tab of a soft-packaged lithium-ion power battery according to claim 1, characterized in that: the tab body (1) has a thickness of 0.1 mm to 0.6 mm. 3. The tab of the soft-packaged lithium-ion power battery according to claim 1, characterized in that: the tab sealant (2) has a thickness of 0.05 mm to 0.3 mm. 4. The tab of the soft-packaged lithium-ion power battery according to claim 1, characterized in that the length of the tab sealant (2) is greater than the length of the tab body (1). 5. The tab of the soft-packaged lithium-ion power battery according to claim 1, characterized in that: the tab body (1) is two pieces. 6. The tab of the soft-packaged lithium-ion power battery according to claim 1, characterized in that: the tab body (1) is three pieces. 7. The tab of the soft-packaged lithium-ion power battery according to claim 1, characterized in that: the tab sealant (2) is bonded and connected to the tab body (1) by glue or heat fusion.

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