CN203787493U - Isolating membrane of lithium ion battery - Google Patents
Isolating membrane of lithium ion battery Download PDFInfo
- Publication number
- CN203787493U CN203787493U CN201420144838.3U CN201420144838U CN203787493U CN 203787493 U CN203787493 U CN 203787493U CN 201420144838 U CN201420144838 U CN 201420144838U CN 203787493 U CN203787493 U CN 203787493U
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- Prior art keywords
- layer
- barrier
- lithium ion
- ion battery
- barrier layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses an isolating membrane of a lithium ion battery. The isolating membrane comprises a barrier layer and a supporting layer, wherein an adhesive layer is arranged between the barrier layer and the supporting layer. The problem that the barrier layer and the supporting layer are likely to be separated from each other due to different adhesion force produced by different melting points can be avoided through the adhesive layer; the supporting layer is made of a high heat-resisting base material, so that the thermal stability of the isolating membrane can be improved; the retraction property and transverse tensile strength of the isolating membrane can be effectively improved.
Description
Technical field
The utility model relates to technical field of lithium ion, especially relates to a kind of lithium ion battery barrier film.
Background technology
The lithium ion battery applications of high power capacity is upper at electronic (EV) or oily electric hybrid vehicle (HEV), in order to reach the characteristic of fast charging and discharging, in the selection of barrier film, for its porosity and heat-resisting character, has harsh requirement.
At present, lithium ion battery utilizes general being made of resin such as polyethylene, polypropylene with barrier film, and it exists the not good problem of thermal endurance.Along with the development of high-power lithium battery, the consideration of fail safe and increasingly important.Wherein do not losing under film fundamental characteristics, promoting the thermal stability of film high temperature, the target that Shi Gejia manufacturer does one's utmost to strive for.
Lithium ion battery is with in the preparation process of barrier film, and that can not avoid must extend film exactly, and barrier film product after extending exists the larger problem of shrinking; The transverse tensile strength of barrier film is not high, cannot effectively be improved always.
Utility model content
Not enough for prior art, technical problem to be solved in the utility model is to provide a kind of lithium ion battery barrier film, and shrinkage character and the transverse tensile strength of its barrier film are effectively improved.
For achieving the above object, the technical scheme that the utility model adopts is: a kind of lithium ion battery barrier film, comprise barrier layer and supporting layer, and between described barrier layer and supporting layer, be provided with bonding coat.
Described barrier layer is that barrier layer I and barrier layer II are two-layer, and described barrier layer I and barrier layer II are located at respectively the both sides of supporting layer.
The surface of described barrier layer is provided with one group of hole, and barrier layer thickness is at 8-100 μ, and surface apertures is at 0.1-1 μ.
The surface of described supporting layer is provided with one group of hole, and supporting layer thickness is at 8-100 μ, and surface apertures is at 0.001mm – 300mm.
Described supporting layer material is terylene or Fypro.
The thickness of described bonding coat is at 0.1-100 μ.
Described bonding coat material is silica gel or acrylic glue.
The temperature tolerance of described bonding coat is at 80-130 ℃.
The utility model compared with prior art, has the following advantages:
Between barrier layer and supporting layer, there is bonding coat, avoid barrier layer and supporting layer because melting point is different, to produce the different and problem easily peeled off of adhesion between two-layer; Supporting layer is selected the base material of high-fire resistance matter, promotes the thermal stability of barrier film; Guaranteeing that under the generally necessary characteristic of barrier film, the transverse tensile strength of its barrier film promotes 79%, barrier film is only 10% in the high-temperature shrinkage test of 130 ℃, 90 minutes, and the shrinkage character of barrier film and transverse tensile strength are effectively improved.
Accompanying drawing explanation
Below the expressed content of each width accompanying drawing of this specification and the mark in figure are briefly described:
Fig. 1 is the utility model barrier film structural representation.
Fig. 2 is the utility model barrier film manufacture method schematic flow sheet.
Fig. 3 is film A structural representation in Fig. 2.
Fig. 4 is film B structural representation in Fig. 2.
Fig. 5 is the vertical view of Fig. 4.
In figure: 1. unreeling structure I, 2. guide wheel I, 3. punch device, 4. guide wheel II, 5. festoon rack, 6. rolling-up mechanism I, 7. layering roll, 8. unreeling structure II, 9. laminating roller, 10. hot pressing wheel, 11. rolling-up mechanism II, 12. release film layer I, 13. bonding coat I, 14. supporting layers, 15. bonding coat II, 16. release film layer II, 17. punchings rete, 18. barrier layer I, 19. barrier layer II afterwards.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, embodiment of the present utility model is described in further detail.
As shown in Figure 1, this lithium ion battery barrier film, comprises barrier layer and supporting layer, between barrier layer and supporting layer, is provided with bonding coat.
Have three layers at least, its five layers better.Barrier layer is two-layer, be respectively barrier layer I 18 and barrier layer II 19, barrier layer I 18 and barrier layer II 19 are located at respectively the both sides of supporting layer 14, between barrier layer I 18 and supporting layer 14, be provided with bonding coat I 13, between barrier layer II 19 and supporting layer 14, be provided with bonding coat II 15, form the barrier film C of five layers.
Wherein, barrier layer is perforated membrane, and barrier layer thickness is at 8-100 μ, and surface apertures is at 0.1-1 μ; Its hole is for isolated battery plus-negative plate and ion conducting function is provided.Barrier layer structure can be compound for single or multiple lift.Barrier material can be the crystallizations such as PET/PP/PE/PVDF/PI/POM/TPX or amorphous macromolecular material.
On supporting layer 14, use machinery or radium-shine technology to be equipped with one group of hole, supporting layer thickness is at 8-100 μ, and surface apertures is at 0.001mm – 300mm.Supporting layer structure can be compound for single or multiple lift.Support layer material can be the materials such as PET/PP/PE/PVDF/PI/POM/TPX, selects terylene or Fypro better, in order to increase two-way mechanical strength and the heat-resisting character of barrier film.
The thickness of bonding coat is at 0.1-100 μ, and bonding coat material is silica gel or acrylic glue, and the temperature tolerance of bonding coat, at 80-130 ℃, wherein exists
better, by bonding coat avoid barrier layer and supporting layer two-layer between because the different problems that produce adhesion difference and easily peel off of melting point.
As shown in Figures 2 to 5, be the manufacturing approach craft flow process of lithium ion battery with barrier film, this manufacture method comprises the following steps:
First, film A in unreeling structure I 1 is unreeled to operation, wherein, film A comprises supporting layer 14 and release film layer, between supporting layer and release film layer, be provided with bonding coat, release film layer is two-layer, is located at the outermost layer of supporting layer both sides, be respectively release film layer I 12 and release film layer II 16, form five tunic structures;
By guide wheel I 2, the film A after unreeling is delivered to punch device 3 positions, carries out punch operation, wherein, punch device 3 can selector tool/radium-shine punch device;
Film after punching is delivered to one group of festoon rack 5 by guide wheel II 4, by being delivered to after festoon rack 5 in layering roll 7, by layering roll 7, outer field release film layer I 12 and release film layer II 16 are carried out to release operation, form film B, the release film layer after separation utilizes 6 rollings of rolling-up mechanism I;
Film B is delivered to laminating roller 9, the outer laminating barrier layer of bonding coat I 13 I 18, the outer laminating barrier layer of bonding coat II 15 II 19 by laminating roller 9 at film B;
After barrier layer I 18 and 19 laminatings of barrier layer II, by hot pressing, take turns 10 and carry out hot press operation, obtain finished product barrier film C, finally by rolling-up mechanism II 11, carry out rolling.
Embodiment 1, adopts above-mentioned manufacture method, and wherein, film A comprises five-layer structure, and release film layer I and release film layer II material are terylene, and thickness is 50 μ; Bonding coat I and bonding coat II material are acrylic glue, and thickness is 3 μ; Supporting layer material is terylene, and thickness is 3.5 μ.
The Circularhole diameter of film Α structure punching is 2-6mm, and rete 17 after the release rear formation punching of release film layer, fitting with barrier layer I and barrier layer II, forms barrier film C.Wherein, barrier layer I and barrier layer II are acrylic resin perforated membrane, and thickness is 14 μ, surface hole defect diameter <1 μ.
Barrier film C in embodiment 1 and the contrast of existing barrier film the performance test results, in Table 1.
Table 1 is barrier film performance test contrast table
Known by table 1 correction data, guaranteeing under the generally necessary characteristic of barrier film, the transverse tensile strength of its barrier film promotes 79%, and barrier film is only 10% in the high-temperature shrinkage test of 130 ℃, 90 minutes, and the shrinkage character of barrier film and transverse tensile strength are effectively improved.
By reference to the accompanying drawings the utility model is exemplarily described above; obviously the utility model specific implementation is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present utility model design and technical scheme carry out; or without improving, design of the present utility model and technical scheme are directly applied to other occasion, all within protection range of the present utility model.
Claims (8)
1. a lithium ion battery barrier film, is characterized in that: comprise barrier layer and supporting layer, between described barrier layer and supporting layer, be provided with bonding coat.
2. lithium ion battery barrier film as claimed in claim 1, is characterized in that: described barrier layer is that barrier layer I and barrier layer II are two-layer, and described barrier layer I and barrier layer II are located at respectively the both sides of supporting layer.
3. lithium ion battery barrier film as claimed in claim 1, is characterized in that: the surface of described barrier layer is provided with one group of hole, and barrier layer thickness is at 8-100 μ, and surface apertures is at 0.1-1 μ.
4. lithium ion battery barrier film as claimed in claim 1, is characterized in that: the surface of described supporting layer is provided with one group of hole, and supporting layer thickness is at 8-100 μ, and surface apertures is at 0.001mm – 300mm.
5. lithium ion battery barrier film as claimed in claim 1, is characterized in that: described supporting layer material is terylene or Fypro.
6. lithium ion battery barrier film as claimed in claim 1, is characterized in that: the thickness of described bonding coat is at 0.1-100 μ.
7. lithium ion battery barrier film as claimed in claim 1, is characterized in that: described bonding coat material is silica gel or acrylic glue.
8. lithium ion battery barrier film as claimed in claim 1, is characterized in that: the temperature tolerance of described bonding coat is at 80-130 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420144838.3U CN203787493U (en) | 2014-03-27 | 2014-03-27 | Isolating membrane of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420144838.3U CN203787493U (en) | 2014-03-27 | 2014-03-27 | Isolating membrane of lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203787493U true CN203787493U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420144838.3U Expired - Fee Related CN203787493U (en) | 2014-03-27 | 2014-03-27 | Isolating membrane of lithium ion battery |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904280A (en) * | 2014-03-27 | 2014-07-02 | 达尼特材料科技（芜湖）有限公司 | Isolating film for lithium ion battery and manufacturing method thereof |
-
2014
- 2014-03-27 CN CN201420144838.3U patent/CN203787493U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904280A (en) * | 2014-03-27 | 2014-07-02 | 达尼特材料科技（芜湖）有限公司 | Isolating film for lithium ion battery and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20160327 |