CN218004973U

CN218004973U - Battery and encapsulation head

Info

Publication number: CN218004973U
Application number: CN202222121400.0U
Authority: CN
Inventors: 黄昌华; 刘国平; 万经祥; 李扬
Original assignee: Chongqing Guanyu Battery Co ltd
Current assignee: Chongqing Guanyu Battery Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-12-09
Anticipated expiration: 2032-08-12

Abstract

The utility model provides a battery and encapsulation head, battery include the casing of electric core and encapsulation electricity core, form side banding, top banding and two banding behind the casing encapsulation electricity core, are provided with the pre-seal between top banding and the two banding, and the pre-seal lies in same one side with two banding, and the last border of pre-seal is not higher than the last border of top banding, and the last border of side banding is not higher than the last border of top banding. The utility model discloses a set up the pre-seal between top banding and the two banding for the one end that two banding are close to the top banding has one section region of sealing in advance, and the last border of pre-seal is not higher than the last border of top banding, and the last border of side banding is not higher than the last border of top banding, can avoid the excessive gluey risk that the part exceeds a banding of the top of two banding and the top of side banding, has solved the excessive gluey problem of top banding.

Description

Battery and encapsulation head

Technical Field

The utility model relates to a lithium ion battery technical field particularly, relates to a battery and encapsulation head.

Background

The lithium ion battery has the advantages of high voltage, high energy density, small self-discharge, no memory effect, wide working range and the like, so that the lithium ion battery is widely applied to various electronic products, particularly the field of consumer electronics. With the increasing demand for consumer electronics, the demand for the dimensional consistency of lithium ion batteries is also increasing.

In the production process of the soft package lithium ion battery, the aluminum plastic film, namely the battery shell, is sealed by mutually fusing PP layers of the aluminum plastic film. The principle of encapsulation is as follows: and at the temperature exceeding the melting point of the PP layer of the aluminum-plastic film, the PP layers of the two layers of aluminum-plastic films to be packaged are heated to be melted, and the two layers of aluminum-plastic films are melted under the action of pressure to bond the PP layers so as to complete the packaging of the battery and realize the sealing of the soft package lithium ion battery. The packaging of soft package lithium ion batteries generally adopts the following procedures: placing a naked battery cell in a pit of an aluminum-plastic film, folding the aluminum-plastic film along the bottom edge of the naked battery cell, and then packaging a side edge to form a side edge sealing, namely a side edge sealing process; then, sealing the top edge to form a top sealing edge, which is also called a top sealing process; and injecting electrolyte into the aluminum plastic film, packaging the other side edge, namely a first sealing process, degassing after formation, cutting off the air bag, and packaging the other side edge to form a second sealed edge, namely a second sealing process.

Because two side banding and two banding and top banding have partial coincidence position when the encapsulation, lead to electric core the longest position to be that side banding and two banding upwards extend and exceed the part above the top banding to some PP can spill over from the top banding because of the influence of encapsulation temperature and pressure, spill over partial PP and can exceed battery body, influence the outward appearance and the height of battery, overflow gluey part not only influences the uniformity of battery size, also influences the energy density of battery.

SUMMERY OF THE UTILITY MODEL

The utility model discloses when aiming at solving current laminate polymer battery encapsulation, there is excessive glue in top banding, and then influences the uniformity of battery and the energy density's of battery problem.

In order to solve the problem, the utility model provides a battery, including electric core and encapsulation the casing of electric core, the casing encapsulation form side seal, top banding and two banding behind the electric core, the top banding with be provided with the pre-seal between the two banding, the pre-seal with two banding are located same one side, just the last border of pre-seal is not higher than the last border of top banding, the last border of side banding is not higher than the last border of top banding.

Further, the lower edge of the pre-seal overlaps with the two seal edge portions.

Further, the size of the pre-seal along the width direction of the battery is larger than or equal to the size of the two sealing edges along the width direction of the battery.

Further, the top seal edge comprises a top seal edge sealing area, a top seal edge unsealing area and a top seal edge glue overflowing area extending out of the top seal edge sealing area, the top seal edge unsealing area is located on one side of the length direction of the battery, and the length of the top seal edge glue overflowing area is smaller than that of the top seal edge unsealing area.

Further, the pre-seal further comprises a pre-seal glue overflow area extending out of the pre-seal, and the length of the pre-seal glue overflow area is smaller than that of the top seal edge un-seal area.

Further, the side sealing edge comprises a side sealing edge sealing area and a side sealing edge glue overflowing area extending out of the side sealing edge sealing area, and the length of the side sealing edge glue overflowing area is smaller than that of the top sealing edge non-sealing area.

Further, the shell is an aluminum-plastic film, and the aluminum-plastic film comprises a protective outer layer, an aluminum layer and a packaging inner layer which are sequentially arranged; the protective outer layer is a nylon layer, and the packaging inner layer is a polypropylene layer.

The utility model discloses the second aspect provides an encapsulation head for encapsulate the first aspect the two banding of battery, include: the sealing device comprises a first sealing head and a second sealing head which can move relative to the first sealing head;

the first end socket comprises a first end face, and a first groove is formed in the first end face;

the second end socket comprises a second end face arranged opposite to the first end face, the second end face is provided with a second groove, and the second groove is arranged opposite to the first groove;

the first groove and the second groove are used for accommodating a top seal edge and a part of pre-seal.

Further, the first groove and the second groove have the same size, the length of the first groove is larger than that of the top seal edge, and the length of the groove is smaller than or equal to the sum of the lengths of the top seal edge and the pre-seal edge.

Further, still including being used for fixing the anchor clamps of battery, anchor clamps include first spacing portion and the spacing portion of second, first spacing portion with the spacing portion symmetry of second sets up the relative both sides of anchor clamps, just first spacing portion with form between the spacing portion of second and hold the holding tank of battery, first spacing portion with interval between the spacing portion of second is greater than the length of battery.

The battery, through setting up the pre-seal between top banding and two banding, make two banding be close to the one end of top banding and have a section of region that has sealed in advance, and the upper border of pre-seal is not higher than the upper border of top banding, the upper border of side banding is not higher than the upper border of top banding, can avoid the excessive glue part of the top of two banding and top of side banding to exceed the risk of top banding, can solve the problem of excessive glue of top banding, thus can improve the uniformity of battery size, improve the size harmfulness and the outward appearance of battery, reduce the volume of battery, improve the energy density of battery, in addition, can also avoid the incident because of excessive glue causes, improve the security performance of battery;

encapsulation head, through set up first recess and second recess respectively at first head and second head, be convenient for avoid overflowing glue and avoid the border position encapsulation, be favorable to improving the effect of encapsulation to improve the efficiency of encapsulation.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery before a secondary sealing process in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a secondary battery sealing process in an embodiment of the present invention;

fig. 4 is a schematic structural view of the package head in the embodiment of the present invention;

FIG. 5 is a schematic structural view of a clamp according to an embodiment of the present invention;

fig. 6 is a schematic structural view of the clamp for clamping the battery according to the embodiment of the present invention.

Description of the reference numerals:

100-electric core; 200-side edge sealing; 300-top edge sealing; 310-top edge sealing area; 320-top seal edge unsealed area; 400-secondary edge sealing; 500-pre-sealing; 600-packaging a seal head; 610-a first end socket; 611 — a first groove; 620-a second end socket; 621-second groove; 630-a clamp; 631-a holder; 632-a first limit part; 633-second limiting part.

Detailed Description

The technical solution of the present invention is clearly and exhaustively described below with reference to the accompanying drawings. In the description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, only for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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 to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In addition, in the description of the present invention, "at least one" means one or more than one, and "at least two" means two or more than two, unless otherwise specifically limited.

In the description of the present specification, the term "on the basis of the above-described embodiments" means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation 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.

Referring to fig. 1 to fig. 3, a first aspect of the present embodiment provides a battery, which includes a battery core 100 and a casing encapsulating the battery core 100, where the casing encapsulates the battery core to form a side sealing edge 200, a top sealing edge 300, and two sealing edges 400, a pre-seal 500 is disposed between the top sealing edge 300 and the two sealing edges 400, the pre-seal 500 and the two sealing edges 400 are located on the same side of the casing, an upper edge of the pre-seal 500 is not higher than an upper edge of the top sealing edge 300, and an upper edge of the side sealing edge 200 is not higher than an upper edge of the top sealing edge 300.

In this embodiment, through setting up the pre-seal between top banding and two banding, make two banding be close to the one end of top banding and have one section region of having sealed in advance, and the last border of pre-seal is not higher than the last border of top banding, the last border of side banding is not higher than the last border of top banding, can avoid the excessive gluey risk that part surpasses top banding of the top of two banding and the top of side banding, can solve the excessive gluey problem of top banding, thereby can improve the uniformity of battery size, improve the size harmfulness and the outward appearance harmfulness of battery, reduce the volume of battery, improve the energy density of battery, furthermore, can also avoid the incident because of excessive gluey leading to, improve the security performance of battery.

Note that the longitudinal direction in the present embodiment refers to a direction indicated by the y-axis in fig. 3, and the width direction refers to a direction indicated by the x-axis in fig. 3.

The pre-seal 500 can be synchronously packaged when the top sealing process is carried out and the top sealing edge 300 is packaged, so that extra packaging time and steps are avoided, and the packaging efficiency is improved.

On the basis of the above embodiment, the lower edge of the pre-seal 500 is partially overlapped with the secondary sealing edge 400, that is, during the secondary sealing process, a part of the secondary sealing edge 400 falls on the pre-seal 500, so that the pre-seal 500 is partially overlapped with the secondary sealing edge 400, thereby ensuring the sealing property of the case, and avoiding the risk of liquid leakage of the battery due to a gap between the pre-seal 500 and the secondary sealing edge 400.

The size of the overlapping portion of the lower edge of the pre-seal 500 and the secondary sealing edge 400 is not further limited in this embodiment, and can be determined by those skilled in the art according to actual conditions, but in order to ensure the sealing performance of the housing, the length of the overlapping portion of the lower edge of the pre-seal 500 and the secondary sealing edge 400 is not less than 0.1mm, for example, the length of the overlapping portion of the lower edge of the pre-seal 500 and the secondary sealing edge 400 is 0.1mm or 0.2mm, etc.

On the basis of the above embodiment, the size of the pre-seal 500 in the width direction of the battery is greater than or equal to the size of the secondary sealing edge 400 in the width direction of the battery, that is, the width of the pre-seal 500 is greater than or equal to the width of the secondary sealing edge 400, so that the width of the sealing edge is not less than the width of the secondary sealing edge 400 in the secondary sealing process, and the sealing performance of the battery can be further ensured.

Based on the above embodiment, the top sealing edge 300 includes a top sealing edge sealing area 310, a top sealing edge non-sealing area 320, and a top sealing edge glue overflowing area (not shown) extending upward along the top sealing edge sealing area 310, the top sealing edge non-sealing area 320 is located on one side of the length direction of the battery, the length of the top sealing edge glue overflowing area is smaller than the length of the top sealing edge non-sealing area 320, that is, the length of the top sealing edge glue overflowing area is greater than the length of the top sealing edge sealing area 310 and smaller than the length of the top sealing edge non-sealing area 320, thereby, the top sealing edge non-sealing area 320 is located on one side of the length direction of the battery, the top sealing edge sealing area 310 is located between the pre-sealing area 500 and the top sealing edge non-sealing area 320, the top sealing edge glue overflowing area can be ensured to be located in the top sealing edge non-sealing area 320, and the top sealing edge glue overflowing area is prevented from exceeding the top sealing edge non-sealing area 320, thereby reducing the overall length of the battery, improving the energy density of the battery, and improving the uniformity of the size of the battery.

Based on the above embodiments, the pre-seal 500 further includes a pre-seal glue-overflowing area (not labeled in the figure) extending out of the pre-seal 500, the length of the pre-seal glue-overflowing area is smaller than the length of the top seal edge non-sealing area 320, and the pre-seal glue-overflowing area and the top seal edge glue-overflowing area are at least partially overlapped. Specifically, the pre-sealing glue-overflowing area may be located in the top sealing edge sealing area 310, and the pre-sealing glue-overflowing area may also be located in the top sealing edge non-sealing area 320.

On the basis of the above embodiment, the side sealing edge 200 includes a side sealing edge sealing area and a side sealing edge glue overflow area (not labeled in the figures) extending upward along the side sealing edge 200, the side sealing edge glue overflow area extends out of the side sealing edge sealing area, and the length of the side sealing edge glue overflow area is smaller than that of the top sealing edge non-sealing area 320, so that the overall length of the battery can be reduced, the energy density of the battery can be improved, and the size consistency of the battery can be improved.

In this embodiment, the casing is the plastic-aluminum membrane, and the plastic-aluminum membrane is including the protection skin, aluminium lamination and the encapsulation inlayer that set gradually. Therefore, the shell combined by the multilayer structure can improve the structural strength of the shell, improve the sealing property of the shell, and improve the insulation property and the use safety of the battery.

On the basis of the embodiment, the outer protective layer is a nylon layer, and the inner packaging layer is a polypropylene layer.

The battery in this embodiment further includes a positive tab and a negative tab, both of which are electrically connected to the battery cell 100, and the positive tab and the negative tab extend from the top sealing edge 300 to the outside of the case.

Referring to fig. 4, a second aspect of the present embodiment further provides a sealing head 600, where the sealing head 600 is used to seal the second sealing edge 400 of the battery in the first aspect, the sealing head 600 includes a first sealing head 610 and a second sealing head 620, the first sealing head 610 and the second sealing head 620 are used to hot press and melt an aluminum plastic film shell, the first sealing head 610 and the second sealing head 620 may be disposed opposite to each other, and the first sealing head 610 and the second sealing head 620 may move relative to each other, it is understood that, during sealing, the second sealing head 620 may move towards the first sealing head 610, and the first sealing head 610 may also move towards the second sealing head 620, so as to seal the shell.

Specifically, the first seal head 610 comprises a first end face, a first groove 611 is formed in the first end face, the second seal head 620 comprises a second end face arranged opposite to the first end face, a second groove 621 is formed in the second end face, the second groove 621 and the first groove 611 can be arranged in an up-and-down direction, in the secondary sealing process, the top seal edge 300 and part of the pre-seal 500 are accommodated between the first groove 611 and the second groove 621, the top seal edge 300 is not encapsulated by the first seal head 610 and the second seal head 620, the situation that the glue overflow area of the top seal edge exceeds the non-seal area 320 of the top seal edge is avoided, the size and consistency of the battery are affected, only part of the pre-seal 500 is accommodated in the first groove 611 and the second groove 621, namely the first seal head 610 and the second seal head 620 encapsulate part of the pre-seal 500, the pre-seal 500 and the second seal edge 400 can be partially overlapped, and the sealing performance of the housing can be guaranteed.

The encapsulation head in this embodiment sets up first recess and second recess respectively through first head and second head, is convenient for avoid overflowing gluey and avoid the marginal position encapsulation, is favorable to improving the effect of encapsulation to improve the efficiency of encapsulation.

On the basis of the above embodiment, the sizes of the first groove 611 and the second groove 621 may be the same, the length of the first groove 611 is greater than the length of the top seal 300, the length of the first groove 611 is less than or equal to the sum of the length of the top seal 300 and the length of the pre-seal 500, the length of the second groove 621 is greater than the length of the top seal 300, and the length of the second groove 621 is less than or equal to the sum of the length of the top seal 300 and the length of the pre-seal 500, thereby ensuring that the first seal head 610 and the second seal head 620 encapsulate part of the pre-seal 500, not encapsulating the top seal 300, and enabling the top seal 300 to move in the first groove 611 and the second groove 621 all the time.

Referring to fig. 5 and 6, the sealing head 600 further includes a fixture 630 for fixing the battery, the fixture 630 includes a fixing seat 631, a first limiting portion 632 and a second limiting portion 633, the first limiting portion 632 and the second limiting portion 633 are both disposed on the fixing seat 631, the first limiting portion 632 and the second limiting portion 633 are symmetrically disposed on two opposite sides of the fixing seat 631, an accommodating groove for accommodating the battery is formed between the first limiting portion 632 and the second limiting portion 633, a distance between the first limiting portion 632 and the second limiting portion 633 is greater than a length of the battery, that is, a length of L1 in fig. 5 is greater than a length of L2 in fig. 6, so that the top sealing edge 300 can always move in the first groove 611 and the second groove 621, and the top sealing edge 300 is guaranteed not to be sealed in the second sealing process.

On the basis of the above embodiment, the shapes of the first limiting portion 632 and the second limiting portion 633 are both "L" shapes, and thus, the length of L1 is greater than the length of L3, so that the first limiting portion 632 and the second limiting portion 633 can clamp the side edge seal 200 in the second sealing process, the side edge seal 200 is limited, the shell is prevented from moving, and the top edge seal 300 can be moved in the first groove 611 and the second groove 621 all the time.

In this embodiment, because the excessive risk of gluing of top banding has been reduced, consequently can cancel current teflon thermal-insulated in two processes, can make the plastic-aluminum membrane casing be heated more fast, make the heated time of plastic-aluminum membrane can reduce 1s to 6s on present basis, be favorable to improving the efficiency of two processes.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims

1. The utility model provides a battery, its characterized in that, includes electric core and encapsulation the casing of electric core, the casing encapsulation form side banding, top banding and two banding behind the electric core, the top banding with be provided with the pre-seal between the two banding, the pre-seal with two banding lie in same one side, just the last border of pre-seal is not higher than the last border of top banding, the last border of side banding is not higher than the last border of top banding.

2. The battery of claim 1, wherein the lower edge of the pre-seal overlaps the two sealed edge portions.

3. The battery of claim 1, wherein the pre-seal has a dimension in the width direction of the battery that is greater than or equal to a dimension of the two sealing edges in the width direction of the battery.

4. The battery of claim 1, wherein the top seal edge comprises a top seal edge seal area, a top seal edge non-seal area and a top seal edge glue overflow area extending beyond the top seal edge seal area, the top seal edge non-seal area is located at one side of the battery in the length direction, and the length of the top seal edge glue overflow area is less than the length of the top seal edge non-seal area.

5. The battery of claim 4, wherein the pre-seal further comprises a pre-seal flash area extending beyond the pre-seal, the pre-seal flash area having a length less than a length of the top seal edge non-seal area.

6. The battery of claim 4, wherein the side seal comprises a side seal land and a side seal flash zone extending beyond the side seal land, the side seal flash zone having a length less than a length of the top seal land non-seal zone.

7. The battery of claim 1, wherein the housing is an aluminum-plastic film comprising an outer protective layer, an aluminum layer and an inner packaging layer arranged in sequence; the protective outer layer is a nylon layer, and the packaging inner layer is a polypropylene layer.

8. A packaging header for packaging a battery of any of claims 1 to 7, comprising: the sealing device comprises a first sealing head and a second sealing head which can move relative to the first sealing head;

9. The packaging head of claim 8, wherein the first groove and the second groove are the same size, wherein the first groove has a length greater than the top seal edge, and wherein the groove has a length less than or equal to the sum of the lengths of the top seal edge and the pre-seal.

10. The packaging head according to claim 8, further comprising a clamp for fixing the battery, wherein the clamp comprises a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are symmetrically arranged on two opposite sides of the clamp, an accommodating groove for accommodating the battery is formed between the first limiting portion and the second limiting portion, and the distance between the first limiting portion and the second limiting portion is greater than the length of the battery.