CN220510123U

CN220510123U - Soft package battery

Info

Publication number: CN220510123U
Application number: CN202320909256.9U
Authority: CN
Inventors: 谭景力; 陈霖; 迟永堂
Original assignee: Shenzhen Xinjie Energy Technology Co ltd
Current assignee: Shenzhen Xinjie Energy Technology Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2024-02-20
Anticipated expiration: 2033-04-17

Abstract

The utility model discloses a soft package battery, which comprises a package shell, a battery core and an external tab; the battery cell is located the main chamber that holds that is formed with in the encapsulation shell, and the front end of encapsulation shell is formed with the bellying, is formed with in the bellying and holds the chamber from holding the front end intercommunication in chamber and the main chamber that holds, and external utmost point ear passes the front end of bellying, is connected with the battery cell utmost point ear electricity of battery cell, and makes the connection welding seal that forms between external utmost point ear and the battery cell utmost point ear be located from holding the intracavity. The soft package battery has higher volume energy density, lower production cost and higher energy utilization rate.

Description

Soft package battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a soft package battery.

Background

The soft package battery belongs to a common battery type, is packaged by an aluminum plastic film, and can be manufactured into various sizes according to specific requirements. And the soft package battery has the advantages of small volume, light weight, high specific energy, high safety, flexible design and the like, and is mainly applied to equipment with requirements on equipment weight and compact space, such as unmanned aerial vehicles, unmanned vehicles, intelligent robots, portable equipment and the like.

At present, as shown in fig. 1, the soft package battery comprises a package shell 1, a battery cell 2 and an external electrode lug 3, wherein the battery cell 2 is packaged in the package shell 1, and the external electrode lug 3 passes through the package shell 1 to be electrically connected with the battery cell 2; wherein, a connecting welding stamp 4 with a certain space volume is formed between the external electrode lug 3 and the battery core electrode lug of the battery core 2; when the front end of the soft package battery is packaged, a direct packaging mode is generally adopted, namely, the front side edge of the package shell 1 is packaged into a straight line, and because the connecting welding mark 4 is required to be sealed in the package shell 1, a large idle space exists between the front side edge of the battery core 2 and the front side edge of the package shell 1, the whole length of the soft package battery is prolonged, and the volume energy density of the soft package battery is reduced.

Disclosure of Invention

In view of the above, the present utility model discloses a soft pack battery to overcome or at least partially solve the above problems.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a soft package battery, which comprises a package shell, a battery core and an external tab;

the battery cell is located in the main accommodating cavity, a protruding portion is formed at the front end of the packaging shell, a secondary accommodating cavity is formed in the protruding portion, the rear end of the secondary accommodating cavity is communicated with the front end of the main accommodating cavity, the external electrode lug penetrates through the front end of the protruding portion and is electrically connected with the battery cell electrode lug of the battery cell, and the connection welding mark formed between the external electrode lug and the battery cell electrode lug is located in the secondary accommodating cavity.

Further, a first preset distance is formed between the connection welding marks formed between the external electrode lugs and the battery core electrode lugs and the inner wall of the accommodating cavity.

Further, the shape of the protruding part is semicircular, square, rectangular or triangular.

Further, corners on the convex parts are rounded.

Further, the front end of the packaging shell is provided with the protruding part, the external electrode lug comprises an external positive electrode lug and an external negative electrode lug, and the battery cell electrode lug comprises a battery cell positive electrode lug and a battery cell negative electrode lug;

the positive electrode connection welding marks formed between the external positive electrode lug and the battery cell positive electrode lug and the negative electrode connection welding marks formed between the external negative electrode lug and the battery cell negative electrode lug are all positioned in the accommodating cavity and are spaced by a second preset distance.

Further, the second preset distance is 3 mm-15 mm.

Further, two protruding portions are formed at the front end of the packaging shell, the external electrode lug comprises an external positive electrode lug and an external negative electrode lug, and the battery cell electrode lug comprises a battery cell positive electrode lug and a battery cell negative electrode lug;

the positive electrode connection welding marks formed between the external positive electrode lugs and the battery cell positive electrode lugs are located in the accommodating cavity in one protruding portion, and the negative electrode connection welding marks formed between the external negative electrode lugs and the battery cell negative electrode lugs are located in the accommodating cavity in the other protruding portion.

Further, the package case includes an upper case and a lower case;

the edge of the upper shell is connected with the edge of the lower shell in a heat sealing way to form a seal edge, and the width of the seal edge is 2-10 mm.

Further, an insulating protective adhesive is arranged between the external tab and the protruding part.

Further, the insulating protective glue is polypropylene glue.

The utility model has the advantages and beneficial effects that:

in the soft-packaged battery, the bulge part is arranged at the front end of the packaging shell, and the connecting welding mark used for accommodating the external electrode lug and the battery core electrode lug is formed in the bulge part, so that the distance between the front side edge of the packaging shell and the front side edge of the battery core is closer, the generation of an idle space is effectively prevented, the space utilization rate of the soft-packaged battery is improved, and the soft-packaged battery has higher volume energy density; and moreover, the soft package battery structure can reasonably utilize the welding area between the external electrode lug and the battery core electrode lug, so that the length of the external electrode lug is reduced, and the production cost of the soft package battery is further reduced.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 is a view showing a structure of a conventional soft pack battery;

fig. 2 is a perspective view of a pouch electric battery according to the present utility model;

FIG. 3 is a front view of a pouch cell according to the present utility model;

fig. 4 is a packaging structure diagram of a soft pack battery according to the present utility model.

In the figure: 1. packaging the shell; 2. a battery cell; 3. externally connected electrode lugs; 3-1, externally connecting a positive tab; 3-2, externally connecting a negative electrode lug; 4. connecting and welding; 4-1, positive electrode connection welding; 4-2, connecting and welding the negative electrode; 5. a boss; 6. insulating protective glue.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to specific embodiments of the present utility model and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, for ease of understanding, the front end/front side in the following embodiments of the present utility model refers to the upper side or upper side in fig. 2.

The following describes in detail the technical solutions provided by the embodiments of the present utility model with reference to the accompanying drawings.

In one embodiment of the present utility model, as shown in fig. 2 to 4, a soft package battery is provided, which includes a package case 1, an electric core 2, and an external tab 3.

Specifically, a main accommodating cavity is formed in the packaging shell 1, the battery cell 2 is located in the main accommodating cavity, a protruding portion 5 is formed at the front end of the packaging shell 1, a secondary accommodating cavity is formed in the protruding portion 5, the rear end of the secondary accommodating cavity is communicated with the front end of the main accommodating cavity, the external electrode lug 3 penetrates through the front end of the protruding portion 5 and is electrically connected with the battery cell electrode lug of the battery cell 2, and a connection welding stamp 4 formed between the external electrode lug 3 and the battery cell electrode lug is located in the secondary accommodating cavity, so that the front side edge of the packaging shell 1 and the front side edge of the battery cell 2 are closer to each other, the length of a soft package battery body can be reduced, and compared with the existing soft package battery structure, the theoretical volume energy density of the soft package battery of the embodiment is improved by about 21.9%. In addition, the external tab is required to be set longer, so that the external tab and the electric device are convenient to electrically connect, and the soft package battery of the embodiment can reasonably utilize the welding area between the external tab and the battery core tab, namely, the height of the protruding part is reasonably utilized, so that the length required by the external tab is reduced, the production cost of the soft package battery is further saved, the overall heat generation condition of the battery core is improved, and the energy utilization rate of the soft package battery is improved.

In summary, in the soft-packaged battery of the embodiment, the protruding portion is disposed at the front end of the packaging shell, and the connection welding mark for accommodating the external electrode tab and the battery core electrode tab is formed in the protruding portion, so that the front side edge of the packaging shell and the front side edge of the battery core are closer to each other, the generation of an idle space is effectively prevented, the space utilization rate of the soft-packaged battery is improved, and the soft-packaged battery has higher volume energy density; and moreover, the soft package battery structure can reasonably utilize the welding area between the external electrode lug and the battery core electrode lug, so that the length of the external electrode lug is reduced, and the production cost of the soft package battery is further reduced.

In this embodiment, as shown in fig. 4, the connection solder 4 formed between the external tab 3 and the battery cell tab is spaced apart from the inner wall of the accommodating chamber by a first predetermined distance. Wherein the first preset distance is not less than 3mm. In this way, electrical insulation between the connection pad 4 and the package 1 can be achieved, preventing the electrical core 2 from being shorted.

The shape of the boss 5 is rectangular; of course, the shape of the protruding portion may be semicircular, square, or triangular.

In addition, the packaging shell comprises an upper shell and a lower shell; wherein, upper shell and inferior valve are plastic-aluminum membrane material.

The edge of the upper shell is connected with the edge of the lower shell in a heat sealing way to form a seal edge, the width of the seal edge is 2-10 mm, and therefore the volume of the soft package battery is smaller and the volume energy density is higher on the premise of ensuring the sealing effect of the package shell.

Further, the corner on the protruding portion is a round angle, the radius of the round angle is 1-10 mm, and therefore the upper shell and the lower shell of the soft package battery can be effectively prevented from being separated at the corner of the protruding portion in the long-term use process, and the sealing performance of the package shell is guaranteed.

In this embodiment, as shown in fig. 2 to 4, two protruding portions 5 are formed at the front end of the package case 1, and an interval between the two protruding portions 5 is 1 mm-1000 mm, the external electrode tab 3 includes an external positive electrode tab 3-1 and an external negative electrode tab 3-2, and the battery cell electrode tab includes a battery cell positive electrode tab and a battery cell negative electrode tab.

Specifically, the positive electrode connection welding stamp 4-1 formed between the external positive electrode lug 3-1 and the battery cell positive electrode lug is positioned in the accommodating cavity in one protruding part 5, and the negative electrode connection welding stamp 4-2 formed between the external negative electrode lug 3-2 and the battery cell negative electrode lug is positioned in the accommodating cavity in the other protruding part 5. Thus, the mutual influence between the positive electrode connecting welding marks 4-1 and the negative electrode connecting welding marks 4-2 can be prevented, and the front side edge of the packaging shell is closer to the front side edge of the battery cell. The position of the protruding part at the front end of the packaging shell can be adjusted according to the position of the battery cell lug on the battery cell.

And, be equipped with insulating protection glue 6 between external utmost point ear 3 and the bellying 5, can prevent to switch on between external utmost point ear 3 and the bellying 5, guaranteed the security of soft packet of battery.

The insulating protective glue is polypropylene glue, so that the sealing effect and the insulating effect between the external electrode lug and the protruding part are better. Of course, the insulating protective glue can also be other glue with insulating and sealing effects, and the insulating protective glue is also within the protection scope of the utility model.

In other embodiments, the front end of the package case is formed with a protruding portion, the external tab includes an external positive tab and an external negative tab, and the battery cell tab includes a battery cell positive tab and a battery cell negative tab.

Specifically, the positive electrode connection welding marks formed between the external positive electrode lug and the battery cell positive electrode lug and the negative electrode connection welding marks formed between the external negative electrode lug and the battery cell negative electrode lug are all positioned in the secondary accommodating cavity, namely the positive electrode connection welding marks and the negative electrode connection welding marks are positioned in the same secondary accommodating cavity, so that the front end structure of the soft package battery is simpler and convenient to process; and the positive electrode connection pad and the negative electrode connection pad are spaced apart by a second predetermined distance. Wherein the second preset distance is 3 mm-15 mm, and the short circuit between the positive electrode connection welding mark and the negative electrode connection welding mark can be prevented.

The foregoing is merely a specific embodiment of the utility model and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the utility model more fully, and that the scope of the utility model is defined by the appended claims.

Claims

1. The soft package battery is characterized by comprising a package shell, a battery core and an external tab;

2. The pouch cell of claim 1, wherein a first predetermined distance is provided between the connection pad formed between the external tab and the cell tab and the inner wall of the receiving chamber.

3. The pouch cell of claim 1, wherein the protrusion has a semicircular, rectangular or triangular shape.

4. The pouch cell of claim 1, wherein the corners on the protrusions are rounded.

5. The flexible battery pack according to claim 1, wherein the front end of the package case is formed with one protruding portion, the external tab includes an external positive tab and an external negative tab, and the cell tab includes a cell positive tab and a cell negative tab;

6. The pouch cell of claim 5, wherein the second predetermined distance is 3mm to 15mm.

7. The flexible battery pack according to claim 1, wherein the front end of the package case is formed with two protruding portions, the external tab includes an external positive tab and an external negative tab, and the cell tab includes a cell positive tab and a cell negative tab;

8. The pouch cell of claim 1, wherein the encapsulation comprises an upper case and a lower case;

9. The flexible battery according to any one of claims 1 to 8, wherein an insulating protective adhesive is provided between the external tab and the protruding portion.

10. The pouch cell of claim 9, wherein the insulating protective gel is a polypropylene gel.