CN218919077U

CN218919077U - Soft package lithium ion battery structure

Info

Publication number: CN218919077U
Application number: CN202223514116.6U
Authority: CN
Inventors: 余勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-25
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses a soft-package lithium ion battery structure, which belongs to the field of lithium ion batteries and comprises a liquid lithium ion battery, wherein a soft-package structure is packaged outside the liquid lithium ion battery, the soft-package structure consists of a base layer and a functional film, the functional film is positioned on the outer layer of the base layer, the base layer comprises a positive electrode, a diaphragm, a negative electrode and an aluminum plastic film, and the functional film comprises one or more combinations of a transition layer, an insulating layer, a heat conducting layer and a scratch-resistant layer. By adding the functional film outside the traditional aluminum plastic film, the three-side notch positions in the soft-package lithium battery are effectively coated, and the film layer has stronger adhesive force. Meanwhile, the novel soft-package lithium battery has the advantages of good insulating property, low water absorption, cold and hot shock resistance, good waterproof property, good salt fog resistance, good acid and alkali corrosion resistance, good heat conducting property, good scratch resistance and the like. By adopting the structure, large-scale automatic production can be realized, compared with the traditional edge sealing by sticking the high-temperature adhesive tape, the cost is reduced and the safety is greatly improved.

Description

Soft package lithium ion battery structure

Technical Field

The utility model relates to the field of lithium ion batteries, in particular to a soft package lithium ion battery structure.

Background

The soft package lithium battery is only sleeved with a polymer shell. The battery pack is packaged by adopting an aluminum plastic film structurally, and the soft package battery can only be inflated to split at most under the condition of potential safety hazard, can not explode like a steel shell aluminum shell battery core, has higher safety, and has lighter weight compared with the steel shell battery and the aluminum shell battery with the same capacity.

However, the existing soft-package lithium battery cannot be completely sealed due to the designed shell, but the existing battery has poor waterproof and salt fog preventing performances, and the battery is easy to fail when being used in a severe environment, so that the whole electronic product is poor. In addition, in the use process, the aluminum plastic film has poor heat conducting property, is easy to cause heat aggregation, and can seriously cause the battery swelling phenomenon. In addition, the edge part of the cut aluminum-plastic film is not insulated, and the cut aluminum-plastic film needs to be wrapped by adhesive paper, and the main defects are as follows: 1. the rubberizing paper has complex process, needs to be finished manually and has higher cost; 2. the three-sided gummed paper occupies space, so that the energy density is reduced; 3. in the use process, the gummed paper is de-adhered and even falls off due to temperature impact and other reasons, so that the quality hidden trouble is caused.

Disclosure of Invention

The utility model mainly aims to provide a soft package lithium ion battery structure which can effectively solve the problems in the background technology.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a soft packet of lithium ion battery structure, includes liquid lithium ion battery, the outside of liquid lithium ion battery has packaged one deck soft packet of structure, soft packet of structure comprises basal layer and functional film, the functional film is located the skin of basal layer, protects the basal layer.

Preferably, the inside of the liquid lithium ion battery is connected with a positive electrode lug and a negative electrode lug, and sealing parts of the extending parts of the positive electrode lug and the negative electrode lug are respectively provided with an insulating sheet.

Preferably, the base layer comprises an anode layer and a cathode layer, a diaphragm is arranged between the anode layer and the cathode layer, the outermost layer of the soft package structure is an aluminum plastic film, and the aluminum plastic film is attached to the surface of the cathode layer.

Preferably, the thickness of the functional film is 1-80um, the transition layer is positioned at the innermost layer, the transition layer is clung to the aluminum plastic film, and the thickness of the transition layer is 50nm-10um.

Preferably, the second layer of the functional film is an insulating layer, and the thickness of the insulating layer is between 1 and 40 um.

Preferably, the third layer of the functional film is a heat conducting layer for leading out the heat inside the battery, and the thickness of the third layer is 10nm-10um.

Preferably, the outermost layer of the functional film is a scratch-resistant layer, and the thickness of the scratch-resistant layer is 50nm-20um.

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

according to the utility model, by designing a new soft-package lithium battery structure, on the premise that the basic structure (anode, diaphragm, cathode and aluminum-plastic film) of the traditional soft-package lithium battery is unchanged, a functional film is added outside the aluminum-plastic film, and the first layer of the functional film is a transition layer, so that the adhesive force between the aluminum-plastic film and other external coatings is enhanced; the second layer is an insulating layer, and the internal battery is protected by excellent high temperature resistance, electrical insulation and corrosion resistance; the third layer is a heat conducting layer and is used for guiding out heat in the working process of the battery; the outermost layer is a scratch-resistant layer and is mainly used for improving the surface hardness of a work product and preventing the product from being scratched. Through the structure, the three incision positions in the soft-packaged lithium battery are effectively coated, and the film adhesive force of the soft-packaged lithium battery is better than that of the traditional adhesive tape. Meanwhile, the novel soft-package lithium battery has the advantages of good insulating property, low water absorption, good cold and hot shock resistance, good salt fog resistance, good acid and alkali corrosion resistance, good heat conduction performance and the like. And moreover, the structure can be used for large-scale automatic production, and the production efficiency is greatly improved, so that the cost of the soft-package lithium battery is reduced, and the safety of the soft-package lithium battery is also greatly improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a soft-pack lithium ion battery according to the present utility model;

fig. 2 is a schematic view of a soft package structure of the soft package lithium ion battery structure according to the present utility model;

FIG. 3 is a schematic view of the basic layer structure of a soft-pack lithium ion battery structure according to the present utility model;

fig. 4 is a schematic diagram of a functional film structure of a soft-pack lithium ion battery structure according to the present utility model.

In the figure: 1. a liquid lithium ion battery; 2. a positive electrode tab; 3. a negative electrode ear; 4. an insulating sheet; 5. a soft package structure; 6. a base layer; 7. a functional film; 8. a positive electrode layer; 9. a diaphragm; 10. a negative electrode layer; 11. an aluminum plastic film; 12. a transition layer; 13. an insulating layer; 14. a heat conducting layer; 15. scratch resistant layer.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

As shown in fig. 1-4, a soft package lithium ion battery structure comprises a liquid lithium ion battery 1, wherein an anode lug 2 and a cathode lug 3 are connected in the liquid lithium ion battery 1, an insulating sheet 4 is respectively assembled at the sealing parts of the extending parts of the anode lug 2 and the cathode lug 3, a soft package structure 5 is packaged outside the liquid lithium ion battery 1, the soft package structure 5 consists of a base layer 6 and a functional film 7, the base layer 6 comprises an anode layer 8 and a cathode layer 10, a diaphragm 9 is arranged between the anode layer 8 and the cathode layer 10, the outermost layer of the soft package structure 5 is an aluminum plastic film 11, and the aluminum plastic film 11 is attached to the surface of the cathode layer 10.

As the improvement of the scheme, the thickness of the functional film 7 is 1-80um, the transition layer 12 is positioned at the innermost layer, the transition layer 12 is tightly attached to the aluminum plastic film 11, the adhesive force between the aluminum plastic film and other external coatings is enhanced, the transition layer is generally one or more of silane coupling agent, polyamide and polyimide, and the polyamide or polyimide has the advantages of excellent comprehensive properties such as alkali chemical corrosion stability, heat resistance, insulativity and the like, and is easy to process. Polyimide PI has excellent high and low temperature resistance, electrical insulation and mechanical properties, and all meet the requirements of the transition layer performance, and the thickness of the polyimide PI is 50nm-10um.

As an improvement of the scheme, the second layer of the functional film 7 is an insulating layer 13, and the material is acrylic, nylon PA, polypropylene PP, acrylic resin, organic silicon resin or epoxy resin, and the layer is an insulating layer, and has good insulating property. The epoxy resin and the organic silicon resin have excellent high temperature resistance, electrical insulation, corrosion resistance and the like, meet the requirements of a film layer, comprehensively consider the protection and cost factors of the epoxy resin and the organic silicon resin to the battery, and have the thickness of 1-40 um.

As an improvement of the scheme, the third layer of the functional film 7 is a heat conducting layer 14 for conducting heat in the battery operation, and the material mainly comprises graphene, boron nitride, aluminum nitride, silicon carbide, zinc oxide and the like, and the thickness of the material is 10nm-10um.

As an improvement of the scheme, the outermost layer of the functional film 7 is a scratch-resistant layer 15 which is mainly used for improving the surface hardness of a work product and preventing the product from being scratched. The main materials are nano ceramic materials such as alumina, zirconia and the like, and the thickness of the nano ceramic materials is 50nm-20um.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a soft packet of lithium ion battery structure, includes liquid lithium ion battery (1), the outside of liquid lithium ion battery (1) has packaged one deck soft packet of structure (5), its characterized in that: the soft package structure (5) is composed of a base layer (6) and a functional film (7), wherein the functional film (7) is positioned on the outer layer of the base layer (6) and is used for protecting the base layer (6).

2. The soft pack lithium ion battery structure of claim 1, wherein: the inside of liquid lithium ion battery (1) has connected anodal ear (2) and negative pole ear (3), anodal ear (2) and the stretching out partial seal of negative pole ear (3) are equipped with insulating piece (4) respectively.

3. The soft pack lithium ion battery structure of claim 1, wherein: the base layer (6) comprises an anode layer (8) and a cathode layer (10), a diaphragm (9) is arranged between the anode layer (8) and the cathode layer (10), the outermost layer of the soft package structure (5) is an aluminum plastic film (11), and the aluminum plastic film (11) is attached to the surface of the cathode layer (10).

4. The soft pack lithium ion battery structure of claim 2, wherein: the thickness of the functional film (7) is 1-80um, the transition layer (12) is positioned at the innermost layer, the transition layer (12) is tightly attached to the aluminum plastic film (11), and the thickness of the transition layer is 50nm-10um.

5. The soft pack lithium ion battery structure of claim 4, wherein: the second layer of the functional film (7) is an insulating layer (13) with a thickness of between 1 and 40 um.

6. The soft pack lithium ion battery structure of claim 4, wherein: the third layer of the functional film (7) is a heat conducting layer (14) for leading out the heat inside the battery, and the thickness of the third layer is 10nm-10um.

7. The soft pack lithium ion battery structure of claim 4, wherein: the outermost layer of the functional film (7) is a scratch-resistant layer (15), and the thickness of the scratch-resistant layer is 50nm-20um.