CN214477790U

CN214477790U - High anti-falling soft package battery structure

Info

Publication number: CN214477790U
Application number: CN202120460761.0U
Authority: CN
Inventors: 但德鑫; 陈军; 窦元运; 陶柱晨
Original assignee: Wuhu Etc Battery Ltd
Current assignee: Wuhu Etc Battery Ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-10-22
Anticipated expiration: 2031-03-03

Abstract

The invention discloses a high-drop-resistance soft package battery structure, which belongs to the technical field of soft package battery manufacturing, and comprises a roll core and an aluminum-plastic film coated outside the roll core, wherein the roll core comprises an anode pole piece, a cathode pole piece and a roll layer which is positioned between the anode pole piece and the cathode pole piece and is wound by a diaphragm, two sides of the roll layer respectively exceed a distance from the anode pole piece, the exceeding parts of two sides of the roll layer are respectively tightened and positioned by a hot-melt adhesive tape to form a buffer area after being bent, and the buffer area is bonded with two ends of the aluminum-plastic film through hot-pressing of the hot-melt adhesive tape.

Description

High anti-falling soft package battery structure

Technical Field

The utility model relates to a laminate polymer battery makes technical field, especially relates to a high anti droppable laminate polymer battery structure.

Background

With the coming of the information age, more and more portable digital products are produced. The complex use environment makes people put higher demands on the safety of the devices. With the increasingly prominent advantages of pouch batteries, they are occupying a larger and larger proportion of power and consumer batteries. Because the shell of the device is mostly made of flexible polymer materials such as aluminum plastic films, the anti-falling performance of the device is directly related to the safety performance of the device.

The electric core falls and mainly receives level or perpendicular effort, if inside book core and membrane shell take place relative slip this moment, can cause risk such as utmost point ear department tears, pole piece bending. At present, most battery factories adopt a mode of sticking a double-faced adhesive tape at the winding ending part to improve the anti-falling performance of batteries, however, the effect brought by the method is not obvious. Because the head and the tail of the battery cell are impacted most often in the falling process, the key for solving the problems is the protection of the head and the tail. It is also reported that protective devices are added at the head and the tail of the cell, but the method can lose the volume energy density of the whole cell, and the added protective devices can not influence the chemical system of the cell. For the above reasons, the improvement of the drop performance of the high energy density pouch battery is still a challenging issue.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a high anti falling nature laminate polymer battery structure can prevent to roll up the deformation that the core head and the tail are direct to be strikeed and lead to through the buffering of coiling the diaphragm, hot melt adhesive tape's fixed to can reach the purpose that promotes the anti falling performance of roll core, can not lose the holistic volume energy density of roll core moreover.

In order to achieve the above object, the present invention provides a technical solution for solving the technical problem: the high-drop-resistance soft package battery structure comprises a roll core and an aluminum-plastic film wrapped outside the roll core, wherein the roll core comprises an anode pole piece, a cathode pole piece and a roll layer which is positioned between the anode pole piece and the cathode pole piece and is wound by a diaphragm, two sides of the roll layer respectively exceed the anode pole piece by a distance, the parts of the two sides of the roll layer which exceed the two sides of the roll layer are respectively tightened and positioned by a hot melt adhesive tape to form a buffer area after being bent, and the buffer area is bonded with two ends of the aluminum-plastic film by hot melt adhesive tape in a hot-pressing mode.

Further, the anode pole piece is wound outside the cathode pole piece, the width of the cathode pole piece is smaller than that of the anode pole piece, the width of the anode pole piece is smaller than that of the diaphragm, and two sides of the diaphragm respectively exceed two sides of the anode pole piece by 4-5 mm.

Furthermore, the anode pole piece is connected with an anode tab, the cathode pole piece is connected with a cathode tab, and the anode tab and the cathode tab penetrate through the buffer area on one side of the winding core.

Furthermore, the buffer areas on two sides of the winding core are respectively tightened and positioned on the upper surface and the lower surface of the winding core through a plurality of hot melt adhesive tapes.

Further, the diaphragm is wound outwards from the centers of the anode plate and the cathode plate, and the winding ending part of the diaphragm is coated with a hot-melt adhesive tape and is bonded with the upper inner surface and the lower inner surface of the aluminum-plastic film through the hot-melt adhesive tape in a hot-pressing mode.

The utility model has the advantages that:

1. the utility model discloses a width of diaphragm is tailor into the width that is greater than anode pole piece and cathode pole piece, at the in-process that the diaphragm convoluteed between anode pole piece and cathode pole piece, make the roll layer both ends of coiling surpass the both ends of anode pole piece and cathode pole piece, the part that will surpass is tightened the back and is tightened the location through hot melt adhesive tape and form the buffer zone, the buffer zone passes through the hot melt adhesive tape to the both ends hot pressing bonding of plastic-aluminum membrane, this kind of structural design has played the effect of buffer protection to the book core that falls, absorb the impact that receives when falling, can restrain effectively that roll core removes in inside, and receive the impact after, the buffer zone can be fine prevent that the pole piece from taking place to warp and cause the safety risk after the impact of roll core head and tail ability.

2. The utility model discloses a coiling of diaphragm ending department coating has the hot melt adhesive tape to through the upper and lower internal surface hot pressing bonding of hot melt adhesive tape and plastic-aluminum membrane, further increased the adhesion between core and the plastic-aluminum membrane, further prevented to roll up the slip of core inside the plastic-aluminum membrane, further improved laminate polymer battery's anti falling nature.

To sum up, this laminate polymer battery structure overall structure is simple, and compact structure has played the effect of buffer protection to the core that rolls down, has prevented to roll up the core head and the tail and directly receive the impact and the deformation that leads to, has inhibited effectively that the core that rolls up is at the inside removal of plastic-aluminum membrane, has promoted the holistic anti falling performance of battery.

Drawings

The contents of the various figures of the specification and the labels in the figures are briefly described as follows:

fig. 1 is a schematic external structural view of the present invention;

FIG. 2 is a longitudinal cross-sectional view of FIG. 1;

the labels in the above figures are: 1. the structure comprises a roll core, 2 parts of an anode pole piece, 3 parts of a cathode pole piece, 4 parts of a diaphragm, 5 parts of a roll layer, 6 parts of a hot melt adhesive tape, 7 parts of a buffer area, 8 parts of a positive tab and 9 parts of a negative tab.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments, and the following embodiments are used for illustrating the present invention, but do not limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model discloses specific embodiment does: as shown in figures 1 and 2, a high anti-falling soft package battery structure, including roll up core 1 and the outer plastic-aluminum membrane that wraps up, roll up core 1 and include anode plate 2, cathode plate 3 and lie in the roll layer 5 that becomes by the coiling of diaphragm 4 between anode plate 2 and the cathode plate 3, the both sides of roll layer 5 surpass anode plate 2 one section distance respectively, the part that roll layer 5 both sides surpass is tightened the location through hot melt adhesive tape 6 respectively after buckling and is formed buffer 7, buffer 7 passes through the hot melt adhesive tape 6 and the both ends hot pressing bonding of plastic-aluminum membrane, this kind of structural design has played the effect of buffer protection to roll core 1 that falls, the impact that receives when the fall is absorbed, can restrain roll core 1 effectively and remove in inside, and receive the impact after, buffer 7 can be fine prevent that the pole piece from taking place to warp and cause the safety risk after the impact at roll core head and the tail.

Specifically, the anode piece 2 is convoluteed to the outside of cathode piece 3 wherein, the width of cathode piece 3 is less than the width of anode piece 2, the width of anode piece 2 is less than the width of diaphragm 4, the effect of preventing the short circuit has been played, 4 ~ 5mm in both sides that exceed anode piece 2 respectively of diaphragm 4, the location can not occupy too big space through hot melt adhesive tape gluing after 5 buckles with rolling up the layer, both can play the effect of buffer protection, can also guarantee to roll up the energy density of core.

Specifically, the anode tab 2 is connected with the anode tab 8, the cathode tab 3 is connected with the cathode tab 9, the anode tab 8 and the cathode tab 9 penetrate through the buffer area 7 on one side of the winding core 1, when the exceeding part of the winding layer 5 is bent downwards, the anode tab 8 and the cathode tab 9 can penetrate through the diaphragm 4, and when the hot melt adhesive tape 6 is used for tightly binding and positioning the exceeding part of the winding layer 5 to form the buffer area 7, the anode tab 8 and the cathode tab 9 also have a certain positioning effect.

Specifically, in order to further improve the structural stability of the buffer areas 7, the buffer areas 7 on both sides of the winding core 1 are respectively tied and positioned on the upper and lower surfaces of the winding core 1 by a plurality of hot melt adhesive tapes 6.

Specifically, the diaphragm 4 is wound outwards from the centers of the anode plate 2 and the cathode plate 3, the hot-melt adhesive tape 6 is coated at the winding end of the diaphragm 4, and the hot-melt adhesive tape 6 is bonded with the upper inner surface and the lower inner surface of the aluminum plastic film in a hot-pressing manner, so that the adhesive force between the winding core 1 and the aluminum plastic film is further increased, the sliding of the winding core 1 in the aluminum plastic film is further prevented, and the falling resistance of the soft package battery is further improved.

The preparation method of the soft package battery structure comprises the following steps:

1) respectively coating the prepared cathode slurry on a cathode current collector, and forming a cathode pole piece by cold pressing and stripping; respectively coating the prepared anode slurry on an anode current collector, and forming an anode pole piece by cold pressing and stripping; the anode pole piece 2 is connected with an anode tab 8, and the cathode pole piece 3 is connected with a cathode tab 9.

2) The width of the diaphragm 4 is increased by 8-10 mm compared with the width of the anode pole piece 2, and the diaphragm is wound with the cathode pole piece 3 and the anode pole piece 2.

3) After winding, the diaphragm 4 beyond the two ends of the winding core 1 is bent downwards and then respectively pasted with a hot melt adhesive tape 6 to form a buffer area 7, and the ending part of the winding core 1 is pasted with the hot melt adhesive tape 6.

4) And packaging the wound roll core 1 into an aluminum-plastic film, and forming hot pressing to bond the aluminum-plastic film and the hot melt adhesive tape 6 on the roll core 1 together.

The foregoing is merely illustrative of some of the principles of the present invention and the description is not intended to limit the invention to the specific constructions and applications shown, so that all modifications and equivalents that may be utilized are within the scope of the invention.

Claims

1. The utility model provides a high anti-falling soft package battery structure, its characterized in that, includes roll core (1) and the outer plastic-aluminum membrane that wraps thereof, roll core (1) including anode plate (2), cathode plate (3) and lie in between anode plate (2) and cathode plate (3) by roll layer (5) that diaphragm (4) convoluteed, the both sides of roll layer (5) are surpassed respectively anode plate (2) a section distance, the part that surpasss in roll layer (5) both sides is tightened respectively through hot melt adhesive tape (6) after buckling and is fixed a position and form buffer (7), buffer (7) are through hot melt adhesive tape (6) and plastic-aluminum membrane's both ends hot-pressing bonding.

2. The high drop resistance pouch cell structure of claim 1, wherein: the outside coiling of negative pole piece (3) positive pole piece (2), the width of negative pole piece (3) is less than the width of positive pole piece (2), the width of positive pole piece (2) is less than the width of diaphragm (4), the both sides of diaphragm (4) surpass respectively 4 ~ 5mm in the both sides of positive pole piece (2).

3. The high drop resistance pouch cell structure of claim 1, wherein: the cathode plate is characterized in that the anode plate (2) is connected with an anode tab (8), the cathode plate (3) is connected with a cathode tab (9), and the anode tab (8) and the cathode tab (9) penetrate through a buffer area (7) on one side of the winding core (1).

4. The high drop resistance pouch cell structure of claim 3, wherein: buffer areas (7) on two sides of the roll core (1) are tightly tied and positioned on the upper surface and the lower surface of the roll core (1) through a plurality of hot melt adhesive tapes (6).

5. The high drop resistance soft package battery structure according to any one of claims 1 to 4, characterized in that: the diaphragm (4) is wound outwards from the centers of the anode plate (2) and the cathode plate (3), and the winding ending part of the diaphragm (4) is coated with a hot-melt adhesive tape (6) and is in hot-press adhesion with the upper inner surface and the lower inner surface of the aluminum plastic film through the hot-melt adhesive tape (6).