CN209929401U - Utmost point ear and lithium ion battery with dysmorphism utmost point ear is glued - Google Patents

Abstract

The utility model belongs to the technical field of the battery, especially, relate to a utmost point ear with dysmorphism utmost point ear is glued, including strap and symmetry set up in the dysmorphism utmost point ear on strap two surfaces is glued, dysmorphism utmost point ear is glued including integrated into one piece's first colloid portion and second colloid portion, the length of first colloid portion is greater than the length of second colloid portion, first colloid portion with form at least one breach between the second colloid portion. Additionally, the utility model discloses still relate to one kind and include the utility model discloses a lithium ion battery of utmost point ear. Compared with the prior art, the utility model discloses a utmost point ear is satisfying under the condition of limit design, and its special-shaped utmost point ear glue in the partial side seal technology that does not participate in the battery of dew, be favorable to improving the encapsulation reliability and the security of electric core.

Description

A kind of pole ear and lithium ion battery with special-shaped pole ear glue

technical field

The utility model belongs to the technical field of batteries, in particular to a pole ear with special-shaped pole ear glue and a lithium ion battery.

Background technique

Soft-pack lithium-ion batteries have been widely used in digital/power cells. Compared with steel-aluminum shell cells, they have advantages in energy density and customization, but their safety and reliability have always been concerned by the industry.

The flexible packaging lithium-ion battery industry generally adopts the process of winding or stacking the positive electrode sheet, the separator and the negative electrode sheet in turn to form a battery cell. The positive electrode sheet leads out a positive electrode tab, and the negative electrode sheet leads out a negative electrode tab; The film wraps the cell in it, performs top sealing and side sealing processes, and finally folds the side sealing edge inward to form a flexible packaged lithium-ion battery.

The tabs are generally composed of metal strips and tabs symmetrically attached to both surfaces of the metal strips. The tab glue mainly plays an insulating role to prevent the metal strips from directly contacting the aluminum-plastic film and forming a short circuit. The shape of the existing tab glue is generally a regular square, and the tab glue is generally divided into three areas, namely the exposed area, the encapsulated area and the inner exposed area. The exposed area is exposed outside the aluminum plastic film, and the encapsulated area participates in the aluminum plastic film. the top seal, and the exposed area is located in the aluminum plastic film. However, in the case of meeting the limit design, that is, the tabs should be set as close to the edge of the cell as possible. At this time, the tab glue in the exposed area will participate in the side sealing of the aluminum plastic film, which will increase the hardness of the side sealing. , when the side sealing edge is folded inward, the formed folded corner will squeeze the winding core, causing a certain safety risk to the battery.

Utility model content

One of the purposes of the present utility model is to provide a tab with special-shaped tab glue in view of the deficiencies of the prior art, and under the circumstance of satisfying the limit design, the exposed part of the special-shaped tab glue does not participate in the operation of the battery. In the side sealing process, the folded corners are prevented from squeezing the winding core, and the safety of the battery core is improved.

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

A pole ear with special-shaped pole-ear glue, comprising a metal strip and special-shaped pole-ear glue symmetrically arranged on both surfaces of the metal strip, wherein the special-shaped pole-ear glue comprises a first colloid part and a second colloid part which are integrally formed, The length of the first colloidal portion is greater than the length of the second colloidal portion, and at least one gap is formed between the first colloidal portion and the second colloidal portion.

As an improvement of the tab with special-shaped tab glue of the present invention, when the number of the notches is one, both the first and second colloidal parts have one end aligned. . When the number of gaps is one, it is only necessary to set the position of the gap corresponding to the corresponding position of the side sealing edge, which can also solve the problems of high hardness of the side sealing edge and angled extrusion of the battery cell caused by the traditional tab glue.

As an improvement of the tab with special-shaped tab glue of the present invention, when the number of the notches is two, the centers of the first colloidal part and the second colloidal part are located at the same center in a straight line. When the number of notches is set to two, no matter which one of the notches is correspondingly arranged at the corresponding position of the side sealing edge, the problems of high hardness of the side sealing edge caused by the traditional tab glue and the battery cell being squeezed by the corner can be solved.

As an improvement of the tab with special-shaped tab glue of the present invention, the transition connection between the first glue part and the second glue part is provided with a rounded corner structure.

As an improvement of the tab with special-shaped tab glue of the present invention, the metal strip includes any one of a nickel strip, an aluminum strip, a copper strip, and an aluminum-to-nickel strip. The special-shaped tab glue of the present invention is suitable for any tab, including but not limited to nickel strips, aluminum strips, copper strips and aluminum-to-nickel strips.

Another object of the present invention is to provide a lithium ion battery, including a battery cell and a packaging bag, wherein a positive electrode tab and a negative electrode tab are drawn from the battery cell, and the packaging bag is formed with a top sealing edge and a side sealing edge , the positive electrode tab and the negative electrode tab are both tabs with special-shaped tab glue as described in any preceding paragraph.

As an improvement of the lithium-ion battery of the present invention, in the positive electrode tab, a part of the first colloid part is located outside the top sealing edge, and another part of the first colloid part is sealed in the The top sealing edge and the second colloid part are located inside the packaging bag, and any one of the gaps is correspondingly arranged at the position where the side sealing edge is located.

As an improvement of the lithium ion battery of the present invention, in the negative electrode tab, a part of the first colloid part is located outside the top sealing edge, and another part of the first colloid part is sealed in the The top sealing edge and the second colloid part are located inside the packaging bag, and any one of the gaps is correspondingly arranged at the position where the side sealing edge is located.

Compared with the prior art, the beneficial effects of the present utility model are:

1) The pole ear of the present utility model has a special-shaped pole-ear glue. The special-shaped pole ear glue is composed of a first colloidal part with a longer length and a second colloidal part with a shorter length, and a gap is formed between the two. Therefore, in the In the case of satisfying the limit design, a part of the first colloid part participates in the top sealing process, the other part of the first colloid part is exposed, and the second colloid part is exposed inside and does not participate in the side sealing process, thus solving the problem of traditional polar ear glue. Participate in the side sealing to increase the hardness of the side sealing edge and the problem of squeezing the battery cell at the corner;

2) The lithium ion battery of the present invention uses the tabs with special-shaped tabs of the present invention as the positive tab and the negative tab, and the positive tab and the negative tab can not only be arranged as close to the edge of the cell as possible, Moreover, the tab glue on the tabs will not affect the side sealing and folding process of the battery, and will not cause the folded corners to squeeze the battery cells, which improves the packaging reliability of the battery and reduces the potential safety hazard of the battery.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

3 is a schematic structural diagram of Embodiment 3 of the present invention.

FIG. 4 is a schematic structural diagram of Embodiment 4 of the present invention.

FIG. 5 is a schematic structural diagram of Embodiment 5 of the present invention.

FIG. 6 is a schematic structural diagram of Embodiment 6 of the present invention.

Among them: 1-metal strip, 2-special-shaped tab glue, 3-battery core, 4-packaging bag, 5-positive tab, 6-negative tab, 21-first gel part, 22-second gel part, 23-notch, 24-rounded corner structure, 41-top edge, 42-side edge.

Detailed ways

As used in the specification and claims, certain terms are used to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different nouns. The description and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As mentioned in the entire specification and claims, "comprising" is an open-ended term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range, and basically achieve the technical effect.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. The orientation or positional relationship shown in the figures is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as Limitations of the present invention.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The present utility model will be further described in detail below in conjunction with the accompanying drawings, but it is not intended to limit the present utility model.

Example 1

As shown in FIG. 1, a tab with special-shaped tab glue includes a metal strip 1 and a special-shaped tab glue 2 symmetrically arranged on both surfaces of the metal strip 1. The special-shaped tab glue 2 includes an integrally formed first colloid part 21 and the second colloidal portion 22, the length of the first colloidal portion 21 is greater than the length of the second colloidal portion 22, both the first colloidal portion 21 and the second colloidal portion 22 have one end aligned, and the first colloidal portion 21 and the second colloidal portion 22 are aligned. A gap 23 is formed between the two colloidal parts 22 . The metal strip 1 includes any one of a nickel strip, an aluminum strip, a copper strip, and an aluminum-to-nickel strip.

Example 2

As shown in FIG. 2 , the difference from Embodiment 1 is that a rounded corner structure 24 is provided at the transition connection between the first colloidal portion 21 and the second colloidal portion 22 in this embodiment.

The rest are the same as in Embodiment 1, and are not repeated here.

Example 3

As shown in FIG. 3 , a tab with special-shaped tab glue includes a metal strip 1 and a special-shaped tab glue 2 symmetrically arranged on both surfaces of the metal strip 1 , and the special-shaped tab glue 2 includes a first colloid part integrally formed 21 and the second colloidal part 22, the length of the first colloidal part 21 is greater than the length of the second colloidal part 22, the centers of the first colloidal part 21 and the second colloidal part 22 are located on the same straight line, and the first colloidal part 21 and the Two notches 23 are formed between the second colloidal parts 22 . The metal strip 1 includes any one of a nickel strip, an aluminum strip, a copper strip, and an aluminum-to-nickel strip.

Example 4

As shown in FIG. 4 , the difference from Embodiment 1 is that a rounded corner structure 24 is provided at the transition connection between the first colloidal portion 21 and the second colloidal portion 22 in this embodiment.

The rest are the same as in Embodiment 1, and will not be repeated here.

Example 5

As shown in FIG. 5, a lithium-ion battery includes a cell 3 and a packaging bag 4. The cell 3 leads out a positive electrode tab 5 and a negative electrode tab 6, and the packaging bag 4 is formed with a top sealing edge 41 and a side sealing edge 42. Both the positive electrode tab 5 and the negative electrode tab 6 are the tabs with special-shaped tab glue of Example 1.

In the positive electrode tab 5, a part of the first colloidal part is located outside the top sealing edge 41, another part of the first colloidal part is encapsulated on the top sealing edge 41, the second colloidal part is located inside the packaging bag 4, and the gap is correspondingly provided on the side seal where edge 42 is located.

In the negative electrode tab 6 , a part of the first colloidal part is located outside the top sealing edge 41 , another part of the first colloidal part is encapsulated on the top sealing edge 41 , the second colloidal part is located inside the packaging bag 4 , and the gap is correspondingly provided on the side sealing edge 41 . where edge 42 is located.

Example 6

As shown in FIG. 6 , the difference from Embodiment 5 is that the positive electrode tabs 5 and the negative electrode tabs 6 of the present embodiment are both tabs with special-shaped tab glue of Embodiment 3.

The rest are the same as in Embodiment 5, and are not repeated here.

The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as the exclusion of other embodiments, but the available Various other combinations, modifications and environments, and can be modified from the above teachings or skill or knowledge in the relevant fields, within the scope of the inventive concept described herein. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (8)

1. The utility model provides a utmost point ear with dysmorphism utmost point ear is glued which characterized in that: including strap and symmetry set up in the dysmorphism utmost point ear of strap two surfaces is glued, dysmorphism utmost point ear is glued including integrated into one piece's first colloidal substance portion and second colloidal substance portion, the length of first colloidal substance portion is greater than the length of second colloidal substance portion, first colloidal substance portion with form at least one breach between the second colloidal substance portion.

2. The tab with the special-shaped tab glue as claimed in claim 1, wherein: when the number of the notches is one, one end parts of the first rubber part and the second rubber part are aligned.

3. The tab with the special-shaped tab glue as claimed in claim 1, wherein: when the number of the notches is two, the centers of the first colloid part and the second colloid part are positioned on the same straight line.

4. The tab with the special-shaped tab glue as claimed in claim 1, wherein: and a fillet structure is arranged at the transition connection part of the first colloid part and the second colloid part.

5. The tab with the special-shaped tab glue as claimed in claim 1, wherein: the metal belt comprises any one of a nickel belt, an aluminum belt, a copper belt and an aluminum-to-nickel belt.

6. A lithium ion battery comprises an electric core and a packaging bag, wherein a positive pole tab and a negative pole tab are led out of the electric core, and the packaging bag is provided with a top edge sealing and a side edge sealing, and is characterized in that the positive pole tab and the negative pole tab are the tabs with the special-shaped tab glue of any one of claim 1 ~ 5.

7. The lithium ion battery of claim 6, wherein: in the positive pole lug, a part of the first colloid part is located the top sealing edge outside, the other part of the first colloid part is packaged in the top sealing edge, the second colloid part is located inside the packaging bag, any one the notch corresponds to be arranged at the side sealing edge position.

8. The lithium ion battery of claim 6, wherein: in the negative pole utmost point ear, partly the first colloid portion is located the top banding outside, another part of first colloid portion encapsulate in the top banding, the second colloid portion is located inside the encapsulation bag, arbitrary breach correspondence set up in side banding position.

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