CN215451472U

CN215451472U - Ultrathin energy storage device

Info

Publication number: CN215451472U
Application number: CN202121730382.5U
Authority: CN
Inventors: 肖伟; 史皓天
Original assignee: Suzhou Rouneng Nano Technology Co ltd
Current assignee: Suzhou Rouneng Nano Technology Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-07
Anticipated expiration: 2031-07-28

Abstract

An ultrathin energy storage device belongs to the technical field of batteries. The ultrathin energy storage device is of an annular sheet structure and comprises a first current collector and a second current collector which are arranged in a stacked mode, wherein at least one positive electrode or at least one negative electrode or at least one positive electrode and at least one negative electrode are printed on the surface of the first current collector, a negative electrode is printed on the surface of the second current collector corresponding to the positive electrode on the surface of the first current collector, a positive electrode is printed on the surface of the second current collector corresponding to the negative electrode on the surface of the first current collector, a diaphragm is arranged between the upper positive electrode and the lower positive electrode which are arranged in pairs, and adjacent electrodes on the surface of the same current collector are arranged in a separated mode; the second current collector leads out two mutually separated lugs to the hollow area of the annular sheet structure. The electrode lug is positioned in the hollow area, so that the transmission distance of ions and electrons is shortened, the internal resistance of the battery can be reduced, and the performance of the battery is improved.

Description

Ultrathin energy storage device

Technical Field

The utility model relates to the technology in the field of batteries, in particular to an ultrathin energy storage device.

Background

The flexible ultrathin battery is a soft and deformable portable power supply, and the thickness of the flexible ultrathin battery is generally not more than 1.2 mm. In recent years, the rapid development of the fields of logistics, medical treatment, wearable equipment and the like promotes the rapid development of flexible ultrathin batteries. With the internal structure design of products becoming more compact, the design requirement on the flexible ultrathin battery becomes higher and higher, and how to improve the performance of the flexible ultrathin battery as far as possible in a limited space becomes a concern.

The present invention has been made to solve the above-mentioned problems occurring in the prior art.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides the ultrathin energy storage device which can reduce the internal resistance of the battery and improve the performance of the battery.

The utility model is in a ring-shaped sheet structure, and comprises a first current collector and a second current collector which are arranged in a stacked manner, wherein the surface of the first current collector is printed with at least one positive electrode, or at least one negative electrode, or at least one positive electrode and at least one negative electrode; the second current collector leads out two mutually separated lugs to the hollow area of the annular sheet structure.

Preferably, the second current collector comprises two parts separated from each other, and each part leads out a tab.

Technical effects

Compared with the prior art, the utility model has the following technical effects:

1) the battery adopts an annular structure, and the positive electrode tab and the negative electrode tab are both positioned in a hollow area at the inner side of the annular structure; under the same battery area, the structure greatly shortens the transmission distance of electron ions, is favorable for reducing the internal resistance of the battery, and is particularly suitable for flexible thin large-area batteries;

2) the device can be completely attached to a load circuit, so that the space is saved;

3) is suitable for various battery systems, including primary batteries (such as lithium/manganese batteries, zinc/manganese batteries and the like), secondary batteries (such as lithium ion batteries, zinc/manganese batteries and the like), and air batteries (such as aluminum/air batteries, zinc/air batteries and the like).

Drawings

FIG. 1 is a schematic diagram of an ultra-thin energy storage device of example 1;

FIG. 2 is an exploded view of the ultra-thin energy storage device of example 1;

FIG. 3 is an exploded view of an ultra-thin energy storage device according to example 2;

the figure includes: the current collector comprises a first current collector 1, a second current collector 2, a negative electrode 3, a positive electrode 4, a sealant 5, a sealing area 6, a tab 7 and a hollow area 8.

Detailed Description

The utility model is described in detail below with reference to the drawings and the detailed description.

Example 1

As shown in fig. 1 and 2, the present embodiment employs a ring-structured battery pack (circular battery pack) including two zinc/manganese unit cells connected in series, and the overall thickness is not more than 1 mm. In addition to the circular shape, the ring-structured battery pack may be provided in a convex polygonal shape.

The battery pack with the annular structure comprises a first current collector 1 and a second current collector 2 which are arranged in a stacked mode, wherein the first current collector 1 and the second current collector 2 are respectively printed on the surface of a high polymer material base film; preferably, the first current collector 1 is annular, the second current collector 2 is composed of two parts which are separated and symmetrically arranged, and the outer edge of the second current collector 2 is aligned with the outer edge of the first current collector 1 up and down. The inner edge and the outer edge of the current collector are both provided with annular sealing areas 6, the sealing areas 6 play a role in separating and sealing, and the width is preferably 3 mm.

A negative electrode 3 and a positive electrode 4 are respectively printed on the surfaces of the first current collector 1 and the second current collector 2, as shown in fig. 2, preferably, the positive electrode and the negative electrode are in arch bridge shapes; the second current collector 2 is printed with a positive electrode 4 corresponding to the negative electrode 3 printed on the first current collector 1, and the second current collector 2 is printed with a negative electrode 3 corresponding to the positive electrode 4 printed on the first current collector 1.

Two parts of the second current collector 2 respectively lead out a tab 7, the two tabs are separated from each other by a sealing area 6, and the two tabs extend into a hollow area 8.

Applying a sealant 5 on the surface of a sealing area 6 on the second current collector 2, and attaching a separator paper with the same shape as the electrode on the surface of the electrode on the second current collector 2; according to the requirements that the anode and the cathode are arranged in pairs up and down and the outer side sealing area 6 on the first current collector 1 and the outer side sealing area 6 on the second current collector 2 are overlapped up and down, the first current collector 1 and the second current collector 2 are attached to form two single batteries, namely, the two single batteries in the battery pack are separated by the sealing areas 6 at the inner edge and the outer edge of the current collectors; after alignment, the sealing area of each battery monomer is ensured to be provided with an air outlet with the width of at least 1-2cm, then the two battery monomers are vacuumized simultaneously, and the first current collector 1 and the second current collector 2 are completely pressed and sealed along the sealing area 6, so that the sealing assembly of the annular structure battery pack is completed. And finally, cutting along the sealed positions of the inner edge and the outer edge of the battery to obtain the finished battery.

Compared with the outer pole lug structure and two zinc/manganese single batteries connected in series, the inner pole lug structure can reduce the internal resistance of 28-35 omega to 12-19 omega.

Example 2

As shown in fig. 1 and 3, the present embodiment employs a ring-structured battery pack including four zinc/manganese unit cells connected in series, and having an overall thickness of not more than 1 mm.

The annular structure battery pack is provided with a first current collector 1 and a second current collector 2 which are arranged in a stacked mode, and the first current collector 1 and the second current collector 2 are respectively printed on the surface of a high polymer material base membrane; preferably, the first current collector 1 is composed of two separated and symmetrically arranged parts, both of which are arched; the second current collector 2 is composed of three parts, a semicircular part, two parts separated and symmetrical with each other, and the outer edge of the second current collector 2 is aligned up and down with the outer edge of the first current collector 1. The inner edge and the outer edge of the current collector are both provided with annular sealing areas 6, the sealing areas 6 play a role in separating and sealing, and the width is preferably 6 mm.

The first current collector 1 and the second current collector 2 are printed with two negative electrodes 3 and two positive electrodes 4 on the surfaces, as shown in fig. 3, preferably, the positive electrodes and the negative electrodes are in arch bridge shapes; the second current collector 2 is printed with a positive electrode 4 corresponding to the negative electrode 3 printed on the first current collector 1, and the second current collector 2 is printed with a negative electrode 3 corresponding to the positive electrode 4 printed on the first current collector 1.

Two mutually separated and symmetrical parts on the second current collector 2 are respectively led out of a tab 7, the two tabs are also separated from each other, and the two tabs extend out of the hollow area 8.

Applying a sealant 5 on the surface of a sealing area 6 on the second current collector 2, and attaching a separator paper with the same shape as the electrode on the surface of the electrode on the second current collector 2; according to the requirements that the positive electrode and the negative electrode are arranged in pairs up and down, and the outer side sealing area 6 on the first current collector 1 and the outer side sealing area 6 on the second current collector 2 are overlapped up and down, the first current collector 1 and the second current collector 2 are attached to form four single batteries, namely, the four single batteries in the battery pack are separated through the sealing areas 6 at the inner edge and the outer edge of the current collectors; after alignment, the sealing area of each battery monomer is ensured to be provided with an air outlet with the width of at least 1-2cm, then the four battery monomers are simultaneously vacuumized, and then the first current collector 1 and the second current collector 2 are completely pressed and sealed along the sealing area 6, so that the sealing assembly of the annular structure battery pack is completed. And finally, cutting along the sealed positions of the inner edge and the outer edge of the battery to obtain the finished battery.

Compared with an outer lug structure and four zinc/manganese single batteries connected in series, the inner lug structure can reduce the internal resistance of 40-60 omega to 15-30 omega.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. An ultrathin energy storage device is characterized by being of an annular sheet structure and comprising a first current collector and a second current collector which are arranged in a stacked mode, wherein at least one positive electrode or at least one negative electrode or at least one positive electrode and at least one negative electrode are printed on the surface of the first current collector, a negative electrode is printed on the surface of the second current collector corresponding to the positive electrode on the surface of the first current collector, a positive electrode is printed on the surface of the second current collector corresponding to the negative electrode on the surface of the first current collector, a diaphragm is arranged between the upper positive electrode and the lower positive electrode which are arranged in pairs, and adjacent electrodes on the surface of the same current collector are arranged in a separated mode; the second current collector leads out two mutually separated lugs to the hollow area of the annular sheet structure.

2. The ultra-thin energy storage device of claim 1, wherein the outer edge of the second current collector is aligned with the outer edge of the first current collector.

3. The ultra-thin energy storage device of claim 1, wherein the ultra-thin energy storage device is closed at its inner and outer edges, respectively, to form a convex polygon or a circle.

4. The ultra-thin energy storage device of claim 3, wherein said inner and outer edges are sealed and a sealant is disposed between two pairs of adjacent positive and negative electrodes at the separation.

5. The ultra-thin energy storage device of claim 1, wherein said positive and negative electrodes are arranged in pairs above and below.

6. The ultra-thin energy storage device of claim 5, wherein said positive and negative electrodes are provided in two pairs.

7. The ultra-thin energy storage device of claim 5, wherein there are four pairs of said positive and negative electrodes.

8. The ultra-thin energy storage device of claim 1, wherein the thickness of the ultra-thin energy storage device is no more than 1 mm.