CN217009499U

CN217009499U - Tab and battery

Info

Publication number: CN217009499U
Application number: CN202220680618.7U
Authority: CN
Inventors: 时健; 单亚平; 邹浒
Original assignee: Zhuhai Cosmx Battery Co Ltd
Current assignee: Zhuhai Cosmx Battery Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-07-19
Anticipated expiration: 2032-03-25

Abstract

The utility model provides a tab and a battery, wherein the tab comprises a tab body and tab glue positioned on two sides of the tab body, the tab glue is provided with a bonding area and a non-bonding area which are connected with each other along the length direction of the tab body, and the bonding area is bonded on the tab body; the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end part of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the pole lug body. The utility model reduces the battery core protrusion, is beneficial to subsequent installation of a protection board and improves the energy density from the structural angle.

Description

Tab and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a tab and a battery.

Background

With the increasingly fierce market competition and the increasingly higher demands of people, how to distinguish from the fierce competition on the basis of meeting the demands of people is the focus of attention of a plurality of enterprises. The lithium battery is one of the most important hardware in a plurality of electronic products, and the quality of the performance of the lithium battery directly affects the comprehensive performance of the electronic products, so that no matter how a purchasing enterprise of the battery core or a company producing the battery core pays attention to how to improve the performance of the battery.

At present, a battery core is provided with a positive electrode lug, a negative electrode lug and an aluminum plastic film, the positive electrode lug and the negative electrode lug are wrapped by the aluminum plastic film respectively to protect the battery core, the positive electrode lug and the negative electrode lug are connected with a battery core pole piece through a welding process, and the main function of the electrode lugs is to serve as a battery core current collector, namely, a tie for outputting or storing electric energy of the battery core. The tab is composed of a tab body and tab glue, short circuit between the tab body and the aluminum plastic film is prevented when the tab glue is used for packaging, and liquid leakage is prevented by hot melting, sealing and bonding the aluminum plastic film together through heating during packaging.

However, when the tab glue in the conventional battery cell is packaged, part of the tab glue can be exposed out of the top sealing edge, so that the subsequent installation of a protection plate on the battery cell is influenced, the occupied space is increased, and the energy density is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the background art, embodiments of the present invention provide a tab and a battery, which reduce the protrusion of a battery cell, facilitate the subsequent installation of a protection plate, and improve the energy density from a structural perspective.

In order to achieve the above object, a first aspect of the present invention provides a tab, which includes a tab body and tab glues located at both sides of the tab body, wherein the tab glues have a bonding area and a non-bonding area connected with each other along the length direction of the tab body, and the bonding area is bonded to the tab body;

the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end part of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the tab body.

Through the arrangement, namely, the tab glue is designed into the bonding area and the non-bonding area which are mutually connected, after the packaging is carried out, the protruding part of the tab glue is the non-bonding area, so that the tab glue of the non-bonding area can be cut, and on one hand, the tab glue of the cut non-bonding area is not bonded with the tab body, so that the cutting of the tab glue can not affect the tab body, and further can not affect the tab; on the other hand, the battery core is reduced to be extended out, the occupied space can be further reduced, the energy density is improved, and the subsequent installation of the protection board is facilitated.

In the tab, optionally, the number of the tab glue is two, the two tab glues are oppositely arranged and connected with each other, the tab body is located between the two tab glues, and the non-bonding areas in the two tab glues are separated from each other.

In the tab, optionally, the extension length of the bonding area and the extension length of the non-bonding area are the same along the width direction of the tab body;

along the length direction of the tab body, the extension length of the bonding area is less than or equal to 5mm, and the extension length of the non-bonding area is less than or equal to 3 mm;

the thickness of each of the adhesive and non-adhesive regions is less than or equal to 0.2 mm.

The utility model provides a battery, which comprises a battery core and an aluminum-plastic film, wherein the battery core is wrapped by the aluminum-plastic film and comprises the tab.

In the above battery, optionally, the bonding region is located between the tab body and the aluminum plastic film, and the non-bonding region extends out of the aluminum plastic film.

In the above battery, optionally, the bonding region includes a first portion and a second portion, the first portion is located between the tab body and the aluminum plastic film, and the second portion extends out of the aluminum plastic film;

the non-bonding area extends out of the aluminum-plastic film.

In the above battery, optionally, the bonding region is located between the tab body and the aluminum plastic film;

the connecting end is positioned between the tab body and the aluminum-plastic film, and the free end extends out of the aluminum-plastic film.

In the above battery, a cutting area cut independently from the tab body is optionally formed between the free end and the connection end.

In the above battery, optionally, the side of the free end facing the aluminum plastic film has a folded edge, and the folded edge covers the edge part of the aluminum plastic film.

In the above battery, optionally, the height of the flanging exceeding the edge part of the aluminum-plastic film is less than 0.5 mm.

The utility model provides a tab and a battery, wherein the battery comprises a battery cell and an aluminum-plastic film, the battery cell is wrapped by the aluminum-plastic film, and the battery cell comprises the tab. The tab comprises a tab body and tab glue positioned on two sides of the tab body, the tab glue is provided with a bonding area and a non-bonding area which are connected with each other along the length direction of the tab body, and the bonding area is bonded on the tab body; the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end part of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the pole lug body. The tab glue is designed into the bonding area and the non-bonding area which are mutually connected, after the packaging is carried out, the part of the tab glue extending out is the non-bonding area, so the tab glue of the non-bonding area can be cut, on one hand, the tab glue of the cut non-bonding area is not bonded with the tab body, so the cutting of the tab glue can not affect the tab body, and further the tab can not affect the tab; on the other hand, can reduce occupation space, improve energy density, be favorable to follow-up installation protection shield.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the drawings without inventive labor.

Fig. 1 is a first view structural diagram of a tab provided in an embodiment of the present application;

fig. 2 is a structural schematic diagram of a second view angle of a tab provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a third view angle of a tab provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery adopting a first mode according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a battery adopting a second mode according to an embodiment of the present application;

fig. 6 is a side view of a battery according to a second embodiment of the present disclosure.

Description of reference numerals:

100-pole ear;

110-a tab body;

120-tab glue;

121-an adhesive region;

122-non-adhesive region;

1221-flanging;

200-a battery;

210-a cell;

220-an aluminum plastic film;

221-edge portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. All other embodiments obtained are within the scope of protection of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the prior art, a battery core is provided with a positive tab and a negative tab and an aluminum-plastic film, the positive tab and the negative tab are wrapped by the aluminum-plastic film respectively to protect the battery core, the positive tab and the negative tab are connected with a battery core pole piece through a welding process, and the tabs mainly serve as a battery core current collector, namely a tie for outputting or storing electric energy of the battery core. The tab is composed of a tab body and tab glue, the tab body and the aluminum plastic film are prevented from being short-circuited during the action of the tab glue during packaging, and the aluminum plastic film is sealed and bonded together in a hot melting manner through heating during packaging so as to prevent liquid leakage. However, when the tab glue in the conventional battery cell is packaged, because a part of the tab glue can be exposed out of the top sealing edge, the subsequent installation of the protection board on the battery cell is influenced, and the tab glue can occupy space and influence energy density.

In order to overcome the defects in the prior art, the tab and the battery provided by the utility model have the advantages that the tab glue is designed into the bonding area and the non-bonding area which are mutually connected, and after packaging, the extending part of the tab glue is the non-bonding area, so that the tab glue of the non-bonding area can be cut; on the other hand, the battery core is reduced to be extended out, the occupied space can be further reduced, the energy density is improved, and the subsequent installation of the protection board is facilitated.

The present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can more clearly understand the content of the present invention in detail.

Fig. 1 is a schematic view of a first view angle structure of a tab provided in an embodiment of the present application, fig. 2 is a schematic view of a second view angle structure of the tab provided in the embodiment of the present application, fig. 3 is a schematic view of a third view angle structure of the tab provided in the embodiment of the present application, and fig. 4 is a schematic view of a battery adopting a first mode provided in the embodiment of the present application.

Example one

Referring to fig. 1 to 4, the present embodiment provides a tab 100, which includes a tab body 110 and tab glue 120 located on both sides of the tab body 110.

It should be noted that the battery 200 is divided into positive and negative electrodes, the tabs are metal conductors that lead the positive and negative electrodes out of the battery cell 210, and the tabs 100 are divided into three materials: the positive electrode of the battery 200 is made of aluminum material, the negative electrode of the battery 200 is made of nickel material, or the negative electrode of the battery 200 is also made of copper-nickel material, and the positive electrode and the negative electrode are both formed by combining the tab body 110 and the tab glue 120.

The tab glue 120 is an insulating part of the tab 100, and is used for preventing a short circuit between the tab body 110 and an aluminum-plastic film as a packaging body during packaging, and is hot-melt sealed and bonded with the aluminum-plastic film in a heating manner during packaging to prevent liquid leakage. Therefore, the sealing performance of the tab glue 120 package is critical to the performance of the entire lithium ion battery 200.

Specifically, the tab body 110 may be welded to the battery cell 210 in a welding manner, for example: the tab body 110 may be disposed on the battery cell 210 in other manners, which is not further limited in this embodiment.

As shown in fig. 1, the tab film 120 has a bonding region 121 and a non-bonding region 122 connected to each other along the length direction of the tab body 110, and the bonding region 121 is bonded to the tab body 110, that is, the non-bonding region 122 is not bonded to the tab body 110.

The non-adhesive region 122 has a connecting end and a free end, the connecting end and the free end are respectively located at two opposite ends of the non-adhesive region 122, the connecting end is connected with the end of the adhesive region 121, so as to ensure the connection between the non-adhesive region 122 and the adhesive region 121, the free end deviates from the connecting end, and the tab body 110 is movably arranged opposite to the tab body 110.

Specifically, the bonding region 121 is bonded to the tab body 110 through a hot pressing process, a high-frequency forming process, or the bonding region 121 may also be bonded to the tab body 110 through other manners, which is not further limited in this embodiment.

Specifically, the tab glue 120 is designed into the bonding area 121 and the non-bonding area 122 which are mutually connected, after packaging, the protruding part of the tab glue 120 is the non-bonding area 122, so that the tab glue 120 of the non-bonding area 122 can be cut, on one hand, the tab glue 120 of the cut non-bonding area 122 is not bonded with the tab body 110, so that the cutting of the tab glue does not affect the tab body 110, and further does not affect the tab 100; on the other hand, the battery core is reduced to be extended out, the occupied space can be further reduced, the energy density is improved, and the subsequent installation of the protection board is facilitated.

In some embodiments, as shown in fig. 1, the length direction of the tab compound 120 is perpendicular to the length direction of the tab body 110, that is, the length direction of the tab compound 120 is the same as the width direction of the tab body 110, and the tab compound 120 and the tab body 110 are alternately arranged perpendicular to each other.

In an alternative embodiment, optionally, as shown in fig. 2 and 3, there are two tab glues 120, the two tab glues 120 are oppositely disposed and connected to each other, and the tab body 110 is located between the two tab glues 120, so as to ensure that the tab glue 120 completely covers the tab body 110 to the maximum extent, and ensure the stability of the package to the maximum extent.

As shown in fig. 3, the non-adhesive regions 122 in the two tab pastes 120 are separated from each other.

In some embodiments, the bonding zone 121 includes a base material and a bonding layer, the bonding layer covers the outer circumferential surface of the base material, and the bonding layer is bonded to the tab body 110.

Optionally, a circle of adhesive layer is arranged along the outer circumferential surface of the base material, or the adhesive layer covers the base material, wherein one side surface of the adhesive layer is adhered to the base material, and the other side surface of the adhesive layer is adhered to the tab body 110.

In the present embodiment, the thicknesses of the base material and the adhesive layer are not limited to any more, and may be set according to actual needs.

In some embodiments, the surface area of the bonding layer is greater than or equal to the surface area of the substrate, that is, the surface area of the bonding layer has two instances, the first being: the surface area of the bonding layer is larger than that of the substrate, and the second type is: the surface area of the adhesive layer is equal to the surface area of the substrate. In either case, the bonding between the bonding layer and the tab body 110 can be ensured to be firmer.

And/or, wherein the bonding area of the bonding layer bonded to the tab body 110 is smaller than or equal to the area of the bonding region 121, that is, the bonding area of the bonding layer bonded to the tab body 110 has two conditions, the first is: the bonding area of the bonding layer bonded with the tab body 110 is smaller than the area of the bonding area 121, and the second type is: the bonding layer is bonded to the tab body 110 in an area equal to the area of the bonding region 121.

It should be noted that, in a general packaging process, the sealing performance and the safety of the finished battery cell 210 need to be ensured. Through top seal, side seal, the glue film fuses airtightly between the plastic-aluminum membrane, has completely cut off moisture and oxygen among the external environment, ensures electric core 210's leakproofness, prevents that the inside system of electric core 210 from taking place the side reaction, and then influences electric core 210 performance. The top seal enables the aluminum plastic film and the adhesive layer of the tab adhesive 120 to be fused and sealed, so that the aluminum plastic film and the tab body 110 are isolated, the safety of the battery cell 210 is ensured, and the battery cell 210 is prevented from being corroded due to the formation of an electronic channel.

Therefore, the area of the bonding region 121 and the area of the entire tab adhesive 120 need to be increased, and besides a part of the tab needs to be bonded to the tab body 110, a corresponding part needs to be ensured to be bonded to the aluminum plastic film in a hot-melt sealing manner, so as to prevent leakage.

In some embodiments, as shown in fig. 1, the area where the bonding layer is bonded to the tab body 110 is the middle of the tab glue 120, that is, the area where the bonding layer is bonded to the tab body 110 divides the tab glue 120 into two symmetrical structures, which can ensure the stability of the whole structure of the tab glue 120.

Optionally, the tab glue 120 is divided into a left symmetrical structure and a right symmetrical structure by the bonding layer and the bonding area of the tab body 110, wherein the size of the left structure and the right structure can be less than or equal to 3mm, and specifically, the corresponding size can be adjusted according to the actual situation, without being limited too much.

In an alternative embodiment, as shown in fig. 1, the extension length of the bonded region 121 and the extension length of the non-bonded region 122 are the same along the width direction of the tab body 110, so as to ensure the stability of the overall structure of the tab adhesive 120 and to enable better hot melt sealing with the aluminum plastic film.

Specifically, the extension length of the bonding region 121 and the extension length of the non-bonding region 122 are both greater than the extension width of the tab body 110.

In the length direction of the tab body 110, the extension length of the bonding region 121 is less than or equal to 5mm, and the extension length of the non-bonding region 122 is less than or equal to 3 mm.

In some embodiments, the extension length of the bonding region 121 may be 1mm, 2mm, 3mm, 4mm, or 5mm along the length direction of the tab body 110.

In this embodiment, the extension lengths of the adhesive region 121 and the non-adhesive region 122 are not further limited, and may be set according to actual needs.

Wherein the thickness of the bonding area 121 and the non-bonding area 122 is less than or equal to 0.2 mm.

For example, the thicknesses of the bonding region 121 and the non-bonding region 122 may be the same or different, as long as the subsequent encapsulation and the energy density of the battery cell 210 are not affected.

Illustratively, the bonded regions 121 and the unbonded regions 122 may have a thickness of 0.05mm, 0.1mm, 0.15mm, or 0.2 mm.

In this embodiment, the thicknesses of the adhesive region 121 and the non-adhesive region 122 are not further limited, and may be specifically set according to actual needs.

In some embodiments, the bonded region 121 has an extension of 2.5mm to 3.5mm and the non-bonded region 122 has an extension of 1.5mm to 2.5mm along the length of the tab body 110.

Illustratively, the extension of the adhesive region 121 may be 2.5mm, 3mm, or 3.5 mm. Likewise, the extension of the non-adhesive zone 122 may be 1.5mm, 2mm or 2.5 mm. By defining the extension of the bonded region 121 and the extension of the non-bonded region 122 in the lengthwise direction of the tab body 110, it can be seen that the extension of the bonded region 121 is greater than the extension of the non-bonded region 122, and on the one hand, the reliability of the bonding between the bonded region 121 and the tab body 110 can be ensured; on the other hand, the non-bonding region 122 is not bonded to the tab body 110, when the tab body 110 is required to be cut, the size of the whole structure of the tab glue 120 is not affected while the tab body 110 is not affected, and meanwhile, the extending non-bonding region 122 can reduce the occupied space, improve the energy density and facilitate subsequent installation of the protection plate after cutting.

It should be noted that, when the battery cell 210 protrudes less or other factors cause the battery cell 210 to protrude less, and the non-bonding region 121 is sealed inside the top seal edge, due to the existence of the bonding region 121 of the tab glue 120, the electrolyte cannot leak out through the tab body 110 and the tab glue 120, and the tab glue 120 of the non-bonding region 121 can be sealed together with the aluminum plastic film by hot melting, so as to prevent the leakage from occurring between the tab glue 120 and the aluminum plastic film, and therefore, when the tab glue 120 protrudes less, the overall sealing effect of the battery cell 210 cannot be damaged.

Wherein, when the extension length of the bonding region 121 is in the range of 2.5mm-3.5mm and the extension length of the non-bonding region 122 is in the range of 1.5mm-2.5mm, the thickness of the bonding region 121 and the non-bonding region 122 is 0.08mm, thereby ensuring the stability of the overall structure of the tab glue 120.

The tab provided by the embodiment of the application comprises a tab body and tab glue positioned on two sides of the tab body, wherein the tab glue is provided with a bonding area and a non-bonding area which are connected with each other along the length direction of the tab body, and the bonding area is bonded on the tab body; the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end part of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the tab body. The tab glue is designed into the bonding area and the non-bonding area which are mutually connected, after the packaging is carried out, the part of the tab glue extending out is the non-bonding area, so the tab glue of the non-bonding area can be cut, on one hand, the tab glue of the cut non-bonding area is not bonded with the tab body, so the cutting of the tab glue can not affect the tab body, and further the tab can not affect the tab; on the other hand, reduce the electric core and lean out, further can reduce occupation space, improve energy density, be favorable to follow-up installation protection shield.

Example two

Fig. 5 is a schematic structural diagram of a battery adopting a second mode according to an embodiment of the present application; fig. 6 is a side view of a battery according to a second embodiment of the present disclosure.

As shown in fig. 4, fig. 5, and fig. 6, on the basis of the first embodiment, a battery 200 is further provided in the second embodiment of the present application, and includes a battery cell 210 and an aluminum-plastic film 220, the battery cell 210 is wrapped by the aluminum-plastic film 220, and the battery cell 210 includes the tab 100.

Specifically, the aluminum-plastic film 220 wraps the battery cell 210, and can protect the battery cell 210, so as to avoid the battery cell 210 from being contaminated by the outside.

In an alternative embodiment, as shown in fig. 1 to 6, the bonded region 121 is optionally located between the tab body 110 and the aluminum plastic film 220, and the non-bonded region 122 extends out of the aluminum plastic film 220.

It should be noted that the bonding region 121 in the tab glue 120 is located between the aluminum plastic film 220 and the tab body 110, so as to prevent the aluminum plastic film 220 from contacting the tab body 110, thereby preventing a short circuit phenomenon.

In an alternative embodiment, the bonding region 121 may optionally include a first portion located between the tab body 110 and the aluminum plastic film 220 and a second portion extending out of the aluminum plastic film;

the non-bonding area extends out of the aluminum-plastic film.

Specifically, the tab body 110 is also a metal band. It can be understood that, generally, since the tab body 110 and the aluminum plastic film 220 are made of metal, when the tab body 110 contacts with the aluminum plastic film 220, a short circuit may occur between the tab body 110 and the aluminum plastic film 220, and therefore, the tab compound 120 is disposed between the aluminum plastic film 220 and the tab body 110.

It should be noted that, in the state that the second portion of the bonding region 121 extends out of the aluminum-plastic film 220, due to the existence of the bonding region 121 of the tab glue 120, the electrolyte does not leak out through the space between the tab body 110 and the tab glue 120, and the tab glue 120 extending out of the non-bonding region 121 of the aluminum-plastic film 220 can be hot-melted and sealed with the aluminum-plastic film 220, so as to prevent leakage between the tab glue 120 and the aluminum-plastic film 220, and therefore, when the second portion of the tab glue 120 extends out of the aluminum-plastic film 220, the overall sealing effect of the battery cell 210 is not damaged.

Specifically, the location of the bonding region 121 in the tab glue 120 is not limited too much.

In an alternative embodiment, the bonding region 121 is optionally located between the tab body 110 and the aluminum plastic film 220;

the connecting end is positioned between the tab body 110 and the aluminum-plastic film 220, and the free end extends out of the aluminum-plastic film 220.

It should be noted that, at this time, the non-bonding region 121 is in a state of being sealed inside the top seal edge, and due to the existence of the bonding region 121 of the tab glue 120, the electrolyte does not leak out through between the tab body 110 and the tab glue 120, and the tab glue 120 of the non-bonding region 121 can be also hot-melt sealed with the aluminum plastic film, so as to prevent the leakage between the tab glue 120 and the aluminum plastic film, and therefore, when the non-bonding region 121 is sealed inside the top seal edge, the overall sealing effect of the battery cell 210 is not damaged.

In an alternative embodiment, a cutting area cut independently from the tab body 110 is optionally formed between the free end and the connection end.

It can be understood that the cutting area is an area between the free end and the connecting end, so that the cutting is convenient, and the specific cutting position can be adjusted according to actual conditions without being limited too much.

As shown in fig. 4, the cut may be made at a position along line a.

In an alternative embodiment, as shown in fig. 5 and 6, the free end of the non-adhesive region 122 has a flanged edge 1221 on the side facing the aluminum plastic film 220, and the flanged edge 1221 covers the edge portion 221 of the aluminum plastic film 220.

In an alternative embodiment, the height of the flanging edge 1221 beyond the edge portion 221 of the aluminum plastic film 220 is less than 0.5mm, such as 0.1mm, 0.2mm, 0.3mm, or 0.4 mm.

It can be understood that, with such a design, it is possible to prevent the aluminum layer in the aluminum plastic film 220 at the position of the tab 100 from being exposed to contact with other metal conductors such as the metal strip of the tab body 110, and further cause short circuit, and the edge part 221 of the aluminum plastic film 220 is covered by the turned edge 1221 to prevent short circuit, wherein the turned edge 1221 is located at the top sealing edge of the battery 200, and the projection of the turned edge 1221 in the thickness direction of the battery 200 does not overlap with the projection of the tab body 110.

Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.

The battery that this application embodiment provided, battery include electric core and plastic-aluminum membrane, and the plastic-aluminum membrane parcel electric core, electric core include foretell utmost point ear. The tab comprises a tab body and tab glue positioned on two sides of the tab body, the tab glue is provided with a bonding area and a non-bonding area which are connected with each other along the length direction of the tab body, and the bonding area is bonded on the tab body; the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end part of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the tab body. The tab glue is designed into the bonding area and the non-bonding area which are mutually connected, after packaging is carried out, the part, extending out of the tab glue, of the tab glue is the non-bonding area, so that the tab glue of the non-bonding area can be cut, and on one hand, the cut tab glue of the non-bonding area is not bonded with the tab body, so that the cutting of the tab glue cannot influence the tab body, and further the tab cannot be influenced; on the other hand, the battery core is reduced to be extended out, the occupied space can be further reduced, the energy density is improved, and the subsequent installation of the protection board is facilitated.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The tab is characterized by comprising a tab body and tab glue positioned on two sides of the tab body, wherein the tab glue is provided with an adhesive area and a non-adhesive area which are connected with each other along the length direction of the tab body, and the adhesive area is adhered to the tab body;

the non-bonding area is provided with a connecting end and a free end, the connecting end is connected with the end of the bonding area, and the free end deviates from the connecting end and is movably arranged relative to the pole lug body.

2. The tab as claimed in claim 1, wherein there are two tab adhesives, two tab adhesives are oppositely disposed and connected to each other, the tab body is located between the two tab adhesives, and the non-adhesive regions of the two tab adhesives are separated from each other.

3. The tab as claimed in claim 1, wherein the extension length of the bonding region and the extension length of the non-bonding region are the same in the width direction of the tab body;

in the length direction of the tab body, the extension length of the bonding area is less than or equal to 5mm, and the extension length of the non-bonding area is less than or equal to 3 mm;

the adhesive region and the non-adhesive region each have a thickness of less than or equal to 0.2 mm.

4. A battery, comprising a cell and an aluminum-plastic film, wherein the aluminum-plastic film wraps the cell, and the cell comprises the tab of any one of claims 1-3.

5. The battery of claim 4, wherein the bonding region is located between the tab body and the aluminum plastic film;

the non-bonding area extends out of the aluminum-plastic film.

6. The battery of claim 4, wherein the bonding region includes a first portion and a second portion, the first portion being located between the tab body and the aluminum plastic film, the second portion extending beyond the aluminum plastic film;

the non-bonding area extends out of the aluminum-plastic film.

7. The battery of claim 4, wherein the bonding region is located between the tab body and the aluminum plastic film;

the connecting end is located between the tab body and the aluminum-plastic film, and the free end extends out of the aluminum-plastic film.

8. The cell defined in claim 4, wherein the free end and the connection end define a cut-out area therebetween that is cut out separately from the tab body.

9. The battery of claim 4, wherein a side of the free end facing the aluminum-plastic film has a flanging covering an edge portion of the aluminum-plastic film.

10. The battery of claim 9, wherein the height of the flanging beyond the edge portion of the aluminum plastic film is less than 0.5 mm.