CN213401325U

CN213401325U - Soft package battery

Info

Publication number: CN213401325U
Application number: CN202022064628.1U
Authority: CN
Inventors: 郑文; 金炜; 李升高; 周燕; 胡大林; 郭玉杰
Original assignee: Springpower Technology Shenzhen Co Ltd
Current assignee: Springpower Technology Shenzhen Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-06-08
Anticipated expiration: 2030-09-18

Abstract

The utility model belongs to the technical field of the battery, a laminate polymer battery is related to, including utmost point core, first half shell and second half shell, the open end of first half shell is provided with first flange, the open end of second half shell is provided with the second flange, first flange and second flange butt joint form the heat banding, utmost point core seals in the casing that first half shell and second half shell formed; the positive tab and the negative tab are led out of the pole core; a plurality of strip-shaped first cuts are cut on the hot sealing edge, and the first cuts extend from the outer edge of the hot sealing edge to the direction close to the pole core; the heat seal is locked to form a skirt around the periphery of the housing. Through surely going out first incision, be favorable to turning over a heat-seal limit and turn over, can not lead to the fact the extrusion injury to utmost point core when rolling over, the handing-over department of heat banding and casing perisporium can not produce crowded gluey phenomenon yet, has reduced the risk of laminate polymer battery corruption weeping, also makes the heat-seal limit can embrace more tightly simultaneously, has reduced laminate polymer battery radial ascending size.

Description

Soft package battery

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a laminate polymer battery.

Background

Pouch cells are cells that employ a polymer, typically an aluminum plastic film, as a housing. Compared with a hard-shell battery, the soft-package battery mainly has the following advantages:

(1) the security is good, and laminate polymer battery adopts the plastic-aluminum membrane packing structurally, and when taking place thermal management out of control or puncture, the plastic-aluminum membrane shell can provide buffer space for electric core, takes place bulging deformation, and only can generate heat or smoke finally, nevertheless can not take place to burn and explode.

(2) The soft-package battery is lighter than a steel-shell battery with the same capacity by 40% and lighter than an aluminum-shell battery by 20%, so that the soft-package battery generally has higher energy density.

(3) The electrochemical performance is good, the service life is long, the internal resistance of the soft package battery is small, the self-consumption of the battery can be greatly reduced, and the cycle life of the soft package battery is longer.

When the existing soft package battery is packaged, the aluminum plastic film needs to be punched to form an upper shell and a lower shell, the upper shell and the lower shell are spliced into a shell, a pole core is arranged in the shell, the horizontal package is provided with an upper edge sealing and a lower edge sealing which are formed after the lower shell is spliced, patterns are pressed on the edge sealing, the end face of the horizontal edge sealing is directly pushed to bend the edge sealing, the edge sealing is directly changed into a vertical direction (along the axial direction of the soft package battery) from the horizontal direction (along the radial direction of the soft package battery), and then the edge sealing is finished by an edge pressing mechanism.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the soft package battery is provided aiming at the problem that the existing soft package battery is easy to corrode and leak liquid.

In order to solve the technical problem, an embodiment of the present invention provides a pouch battery, including a pole piece, a first half shell and a second half shell, wherein an open end of the first half shell is provided with a first flange, an open end of the second half shell is provided with a second flange, the first flange and the second flange are butted to form a heat sealing edge, and the pole piece is sealed in a casing composed of the first half shell and the second half shell;

the pole core is led out of a positive pole lug and a negative pole lug, and the outer end of the positive pole lug and the outer end of the negative pole lug penetrate out of the shell through the heat-sealed edges;

a plurality of strip-shaped first notches are cut in the hot sealing edge, the first notches extend from the outer edge of the hot sealing edge to the direction close to the pole core, and the distance between one end, close to the pole core, of each first notch and the side wall of the shell is greater than 0;

the heat seal edge is locked to form a skirt around the periphery of the housing.

Optionally, the extending direction of the first notch is along the radial direction of the pole core.

Optionally, the extending direction of the first notch is at an angle to the radial direction of the pole core.

Optionally, a distance between an end of the first cutout near the pole piece and the side wall of the housing is at least 0.8 mm.

Optionally, the first cuts are evenly distributed along a circumferential direction of the heat seal edge.

Optionally, one end of the first notch close to the pole core is provided with a stop edge notch.

Optionally, the edge-stopping notch is an arc-shaped notch.

Optionally, the edge-stopping cut is a circular hole.

Optionally, the first half shell is provided with a first pole core pit, the pole core being accommodated within the first pole core pit.

Optionally, the second half shell is provided with a second pole core pit, and after the first half shell and the second half shell are butted, the first pole core pit and the second pole core pit form a containing cavity for containing the pole core.

Compared with the prior art, the soft package battery provided by the embodiment of the utility model, through cutting many banding first incisions on the heat-seal edge, be favorable to turning over a motion to the heat-seal edge, and make turn over a motion and lock and form around the shirt rim of casing periphery to the heat-seal edge, can not cause extrusion injury to the utmost point core, the handing-over department of heat banding and casing perisporium can not produce crowded gluey phenomenon yet, has reduced the risk of soft package battery corruption weeping, also make the heat-seal edge can be locked tighter simultaneously, has reduced the radial ascending size of soft package battery; and the distance between the end of the first notch close to the pole core and the side wall of the shell is greater than 0, namely, a certain distance is reserved between the end of the first notch close to the pole core and the side wall of the shell, so that the heat-sealing edge still has a certain heat-sealing width, and the reliability of heat sealing is ensured.

Drawings

Fig. 1 is a schematic structural view illustrating a heat-sealed edge of a pouch battery folded into a skirt according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a pouch battery according to an embodiment of the present invention, in which a heat-sealed edge of the pouch battery is not folded into a skirt;

fig. 3 is a schematic structural view of a pouch battery according to an embodiment of the present invention, in which an extending direction of a first notch is along a radial direction of a pole core;

fig. 4 is a schematic structural diagram of a pouch battery according to an embodiment of the present invention, in which an extending direction of a first notch forms an angle with a radial direction of a pole core;

fig. 5 is a schematic structural view of a pouch battery according to another embodiment of the present invention, in which the heat-sealed edge of the pouch battery is not folded to form a skirt;

FIG. 6 is a schematic view of the heat-sealed sides of FIG. 5 folded over into a skirt.

The reference numerals in the specification are as follows:

1. a positive tab; 2. a negative tab;

3. a housing; 31. a first half shell; 32. a second half shell; 33. performing hot edge sealing; 331. a first cut; 332. edge stopping and cutting; 34. a skirt.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "upper", "lower", and the like, are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 1-4, the embodiment of the present invention provides a pouch battery, which includes a pole piece (not shown), a first half shell 31 and a second half shell 32, wherein an open end of the first half shell 31 is provided with a first flange, an open end of the second half shell 32 is provided with a second flange, the first flange and the second flange are butted to form a thermal sealing edge 33, and the pole piece is sealed in a housing 3 formed by the first half shell 31 and the second half shell 32;

the pole core is led out of the positive pole lug 1 and the negative pole lug 2, and the outer end of the positive pole lug 1 and the outer end of the negative pole lug 2 penetrate out of the shell 3 through the heat-sealing edges 33;

a plurality of strip-shaped first notches 331 are cut in the heat sealing edge 33, the first notches 331 extend from the outer edge of the heat sealing edge 33 to the direction close to the pole core, and the distance between one end, close to the pole core, of the first notches 331 and the side wall of the shell 3 is greater than 0;

the heat seal 33 is locked to form a skirt 34 around the periphery of the housing 3 (as shown in figure 1).

Compared with the prior art, the embodiment of the utility model provides a laminate polymer battery, through cutting out many banding first cuts 331 on heat-seal edge 33, be favorable to turning over a motion to heat-seal edge 33, and make turn over a motion and lock and form around the shirt rim 34 around casing 3 periphery to heat-seal edge 33, can not cause extrusion injury to the pole piece, the handing-over department of heat-seal edge 33 and casing 3 perisporium can not produce crowded gluey phenomenon yet, the risk of laminate polymer battery corruption weeping has been reduced, also make heat-seal edge 33 can be locked tighter simultaneously, the radial ascending size of laminate polymer battery has been reduced; and the distance between the end of the first notch 331 close to the pole core and the side wall of the housing 3 is greater than 0, that is, a certain distance (preferably enough to perform effective heat sealing) is provided between the end of the first notch 331 close to the pole core and the side wall of the housing 3, so that the heat-sealing edge 33 still has a certain heat-sealing width, and the reliability of heat sealing is ensured.

In one embodiment, the first notch 331 extends in a radial direction of the pole core, as shown in fig. 3, or the first notch 331 extends at an angle with respect to the radial direction of the pole core, as shown in fig. 4. It depends mainly on the direction of the knife, so long as it cuts the first slit 331 in the form of a strip extending from the outer edge of the heat-seal land 33 toward the pole core.

Preferably, the first incisions 331 are evenly distributed along the circumferential direction of the heat seal 33, which is more advantageous for the folding action of the heat seal 33.

In one embodiment, the distance between the end of the first cutout 331 near the pole piece and the side wall of the housing 3 is at least 0.8 mm. So that the heat seal edge 33 still has a certain heat seal width, and the reliability of heat seal is ensured.

In one embodiment, as shown in fig. 1-6, the first notch 331 is provided with a cut-out 332 at an end thereof adjacent to the pole piece. When the first notch is cut, the heat-seal edge at the termination end of the first notch (the end of the first notch 331 close to the pole core) is not easy to tear, the heat-seal effect of the heat-seal edge is effectively improved, and the heat-seal effect of the heat-seal edge cannot be influenced by cutting the first notch 331.

Preferably, the edge-stop notch 332 is an arc-shaped notch or a circular hole. It should be noted that the arcuate cut or circular hole should not be too large to interfere with the heat sealing effect of the heat sealed edges.

The embodiment of the utility model provides a laminate polymer battery obtains through following step:

s10: obtaining a pole core with a positive pole lug 1 and a negative pole lug 2; the positive tab 1 and the negative tab 2 are not particularly limited, and may be selected according to actual requirements, for example, metal strips or metal sheets made of gold, platinum, aluminum, copper, or other materials may be used; the pole core is not particularly limited, and a winding core or a lamination structure cell commonly used in the art can be adopted; the flexible packaging film is preferably an aluminum-plastic composite film which has good compression resistance, heat sealing performance and sealing performance, can effectively prevent the leakage of the battery in the flexible package battery, and prolongs the service life of the flexible package battery;

s20: obtaining a first half-shell 31 with a first edge seal and a second half-shell 32 with a second edge seal, formed by soft packaging film stamping;

s30: the pole piece is placed in the first half shell 31;

s40: butting the first sealing edge and the second sealing edge, so that the first half shell 31 and the second half shell 32 form a shell 3 containing the pole core, and the outer end of the positive pole lug 1 and the outer end of the negative pole lug 2 respectively penetrate through the space between the first sealing edge and the second sealing edge;

s50: heat sealing the first and second seals to form a hot seal 33;

s60: a plurality of strip-shaped first notches 331 are cut from the outer edge of the heat-sealing edge 33 to the direction close to the pole core, and a certain distance is reserved between one end of each first notch 331 close to the pole core and the side wall of the shell 3; the first cut 331 can be cut by a cutter.

S70: the heat seal 33 is folded over and locked to form a skirt 34 around the periphery of the housing 3.

In step S20, a first half shell 31 having a first hem seal and a second half shell 32 having a second hem seal, which are formed by soft packaging film stamping, are obtained. Wherein the first half-shell 31, which may be stamped, has a first pole core pit for accommodating the pole core, and the second half-shell 32 does not have a pole core pit for accommodating the pole core, the entire pole core being accommodated in the first pole core pit; the first half shell 31 may be formed by stamping and has a first pole core pit, the second half shell 32 may be formed by stamping and has a second pole core pit, and after the first half shell 31 and the second half shell 32 are butted, the first pole core pit and the second pole core pit form a containing cavity for containing a pole core, and the pole core is contained in the containing cavity.

Wherein, the depth of first pole core hole and second pole core hole can be the same also can be different, the utility model discloses do not do the restriction here.

The first half shell 31 and the second half shell 32 can be formed on the same flexible packaging film, and when the first half shell 31 and the second half shell 32 are to form the shell 3 containing the pole core, the first half shell 31 and the second half shell 32 can be butted only by folding along a symmetry line between the two, as shown in fig. 5 and 6, the structure of the flexible packaging battery obtained in this way is schematically illustrated, wherein the negative electrode tab 2 is not shown, and can be led out from the axial end face of the shell 3; in the alternative, the first and second sets of the first,

the first half-shell 31 and the second half-shell 32 can be formed on different flexible packaging films (i.e. independent of each other), and when the first half-shell 31 and the second half-shell 32 are to be formed into the housing 3 for containing the pole core, the two independent of each other are butted, as shown in fig. 1 to 4, which are schematic structural views of the pouch battery obtained in this way.

In step S50, heat sealing the first and second seals to form the hot seal 33; and when the first sealing edge and the second sealing edge are heat sealed, the heat sealing machine can carry out heat sealing.

The position of the positive tab 1 led out from the casing 3 and the position of the negative tab 2 led out from the casing 3 may be any angle position on the circumference, and the present invention is not limited herein.

The extending direction of the first notch 331 is along the radial direction of the pole core, or the extending direction of the first notch 331 is at an angle with the radial direction of the pole core. It depends mainly on the direction of the knife, so long as it cuts the first slit 331 in the form of a strip extending from the outer edge of the heat-seal land 33 toward the pole core.

Before step S60, that is, before the first cuts are made in the direction from the outer edge of the heat seal edge to the direction close to the pole core, the method further includes step S80: a cut-off edge 332 is cut in the heat-seal land 33 as a terminal end of the first cut 331. Make when cutting out first incision, the heat-seal limit of the termination department of first incision is difficult to tear, and the effectual heat-seal effect that improves hot banding can not influence the heat-seal effect of hot banding because of having cut first incision 331.

Preferably, the edge-stop slits 332 may be arc-shaped slits, or they may be circular slits, and it should be noted that the arc-shaped slits or the circular holes may not be too large so as not to affect the heat-sealing effect of the heat-sealed edges.

Step S70, namely, folding and locking the heat sealing edge 33 to form a skirt 34 around the periphery of the housing 3, specifically including: the heat sealing edge 33 is turned over towards the axial direction of the pole core through the edge folding clamp, an angle is formed between the turned heat sealing edge 33 and the radial direction of the pole core, the value range of the angle is 0-80 degrees, and the turned heat sealing edge 33 is locked through the edge ironing clamp to form a skirt 34 around the periphery of the shell 3. Wherein the flanging clamp and the edge ironing clamp can adopt the existing mechanisms.

Or step S70, namely, folding and locking the heat sealing edge 33 to form a skirt 34 around the outer periphery of the housing 3, specifically including: the heat sealing edge 33 is turned over towards the axial direction of the pole core by the edge folding clamp, and the turned heat sealing edge 33 forms an angle with the radial direction of the pole core, wherein the angle ranges from 80 degrees to 90 degrees, so that a skirt 34 surrounding the periphery of the shell 3 is formed. Because the heat sealing edge 33 is turned to 80-90 degrees, the skirt 34 surrounding the periphery of the shell 3 can be formed without adopting an edge ironing clamp, and one-step forming is realized.

After step S50, i.e. after heat sealing the first and second seals to form the hot seal 33, step S90 is further included: the hot seal 33 is cut to remove excess trim. Wherein the hot seal 33 may be cut by a guillotine.

After step S70, namely after folding and locking heat seal 33 to form skirt 34 around the outer periphery of housing 3, step S100 is further included: and sleeving a sleeve on the periphery of the skirt edge 34 through a film sleeving machine so as to protect the soft package battery.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a laminate polymer battery, its characterized in that includes utmost point core, first half shell and second half shell, the open end of first half shell is provided with first flange, the open end of second half shell is provided with the second flange, first flange with the butt joint of second flange forms the heat banding, utmost point core seals in the casing that first half shell and second half shell are constituteed;

2. The pouch cell according to claim 1, wherein the first cut extends in a radial direction of the pole piece.

3. The pouch cell according to claim 1, characterized in that the first cut-out extends at an angle to the radial direction of the pole piece.

4. The pouch cell according to claim 1, wherein the distance between the end of the first cutout near the pole piece and the side wall of the case is at least 0.8 mm.

5. The pouch cell according to claim 1, wherein the first slits are evenly distributed along a circumferential direction of the heat seal edge.

6. The pouch battery according to claim 1, wherein the end of the first cutout near the pole core is provided with an edge stop cutout.

7. The pouch cell defined in claim 6, wherein the edge stop cut is an arcuate cut.

8. The pouch cell according to claim 6, wherein the edge-stopping cut is a circular hole.

9. The pouch cell according to claim 1, wherein the first half shell is provided with a first pole core pit, the pole core being received within the first pole core pit.

10. The laminate battery according to claim 9, wherein the second half shell is provided with a second pole core pit, and the first pole core pit and the second pole core pit constitute a receiving cavity for receiving the pole core.