CN201918456U - Lithium battery composite diaphragm and diaphragm bag - Google Patents
Lithium battery composite diaphragm and diaphragm bag Download PDFInfo
- Publication number
- CN201918456U CN201918456U CN2010205920178U CN201020592017U CN201918456U CN 201918456 U CN201918456 U CN 201918456U CN 2010205920178 U CN2010205920178 U CN 2010205920178U CN 201020592017 U CN201020592017 U CN 201020592017U CN 201918456 U CN201918456 U CN 201918456U
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- Prior art keywords
- diaphragm
- bag
- electrode plate
- lithium battery
- diaphragm bag
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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 relates to a lithium battery composite diaphragm and diaphragm bag, wherein the composite diaphragm is a composite structure comprising a non-woven diaphragm and an ion diaphragm. The diaphragm bag is made of the composite diaphragm and takes the shape of a bag which is sealed up at the lower end and is not sealed up at the upper end, and the size of the diaphragm bag is adaptable to that of an electrode plate. In the utility model, the diaphragm bag is used for mounting a positive electrode plate or a negative electrode plate and is sealed up all around, thereby avoiding possible short circuit in the battery caused by dropping of electrode powder; meanwhile, the positive electrode plate is not in direct contact with the negative electrode plate as the positive electrode plate or the negative electrode plate is not exposed, thereby avoiding the problem of short circuit caused by direct contact of the positive electrode plate and the negative electrode plate and greatly improving the safety performance of the battery.
Description
Technical field
The utility model relates to the technical field of battery, specifically, relates to a kind of lithium battery composite diaphragm and diaphragm bag.
Background technology
Lithium battery is as novel chemical power source, and its market makes rapid progress, and is the main fresh combatants of chemical cell, and range of application is extremely extensive.But the safety problem of lithium battery and high manufacturing cost have also restricted the development of lithium battery.Common lithium battery by just/negative material, electrolyte, barrier film and battery case packaging material form.In the structure of lithium battery, barrier film is one of crucial interior layer assembly.The performance of barrier film has determined the interfacial structure, internal resistance of battery etc., directly influences the characteristics such as capacity, circulation and security performance of battery, and the barrier film of excellent performance has important effect to the combination property that improves battery.
Because used electrolyte is an organic solvent, and is different with water solution system, therefore should put at first as the safety issue of septum for lithium ion battery, except that the key property that possesses general all barrier films of battery, also should have following characteristic:
1: the chemical stability in organic solvent;
2: the electronic conductivity of organic bath is lower than the aqueous solution, so electrode area is big, so barrier film is thin as far as possible;
3: and can fully be flooded by organic electrolyte, and its saturating machine of maintenance that can height when discharge, charging;
4: when battery takes place unusually, want the energy obturator hernia when battery temperature raises, reach the purpose of cutting off electric current.
The material of lithium battery diaphragm mainly adopts with ionic membrane or polypropylene non-woven fabric in the prior art.Ionic membrane is poor to the organic solvent imbibition moisture retention in the electrolyte, thus single use its as barrier film, the liquid absorption deficiency of battery; Polypropylene non-woven fabric be because the aperture can not produce closed pore greatly when battery temperature raises, thereby can not realize preventing electrolyte by reaching the purpose of partition electric current, so poor stability.Be open use in traditional lithium battery production septation in addition.The particulate of electrode comes off and can cause the micro-short circuit of battery, in use stays potential safety hazard for lithium battery, and fail safe is not high.
The utility model content
The utility model purpose aims to provide a kind of lithium battery composite diaphragm and diaphragm bag, improves the fail safe of lithium battery.
For achieving the above object, the utility model provides a kind of lithium battery composite diaphragm, for comprising the composite construction of nonwoven fabrics barrier film and ion diaphragm.
Described composite construction is specially three layers of barrier film: two-layer nonwoven barrier film and one deck ion diaphragm, ion diaphragm is between the two-layer nonwoven barrier film.
The utility model provides a kind of diaphragm bag, and described diaphragm bag is made with aforesaid composite diaphragm, and diaphragm bag is the bag shape of end closure upper end open-ended down, and size and pole piece size adapt.
Preferably, in the middle of diaphragm bag, be provided with packaging belt, make diaphragm bag be divided at least two son bags.
The number of described son bag is corresponding with the folding number of plies of the pole piece that needs encapsulation.
Being arranged on when diaphragm bag encapsulated of described packaging belt obtains by heat-sealing.
The diaphragm bag that the utility model provides is used to adorn positive plate or negative plate, and sealing has all around been avoided because the internal short-circuit of battery that utmost point powder comes off and might cause; Do not have exposed positive plate or negative plate simultaneously, thereby do not have direct contact the between positive plate and the negative plate, avoided having improved the security performance of battery greatly because of the direct short circuit problem that causes of contact of positive/negative plate.
Description of drawings
Fig. 1 a is the application schematic diagram of the utility model embodiment composite diaphragm;
Fig. 1 b is the structural representation of the utility model embodiment composite diaphragm;
Fig. 2 a is the application schematic diagram of the utility model embodiment composite diaphragm;
Fig. 2 b is the structural representation of the utility model embodiment composite diaphragm;
Fig. 3 a is the structural representation of the utility model embodiment diaphragm bag;
Fig. 3 b is the another kind of structural representation of the utility model embodiment diaphragm bag;
Fig. 4 a and Fig. 4 b are the encapsulation schematic diagram of the utility model embodiment diaphragm bag;
Fig. 5 a and Fig. 5 b are the another kind encapsulation schematic diagram of the utility model embodiment diaphragm bag;
Fig. 5 b is the another kind of structural representation of the utility model embodiment diaphragm bag;
Fig. 6 a is the square winding-structure schematic diagram of the utility model embodiment;
Fig. 6 b is that the circular roll of the utility model embodiment is around structural representation;
Fig. 6 c is the separation lamination schematic diagram of the utility model embodiment;
Fig. 6 d is the continuous lamination schematic diagram of the utility model embodiment.
Embodiment
Shown in Fig. 1 a and Fig. 1 b, the lithium battery composite diaphragm 101 that the utility model provides, for comprising the composite construction of nonwoven fabrics barrier film 102 and ion diaphragm 103, be specifically as follows and comprise two-layer barrier film: nonwoven fabrics barrier film 102 and ion diaphragm 103, the preparation method can be for after superposeing ion diaphragm 102 and polypropylene non-woven fabric 103, the cut-off knife that utilization is cut makes two kinds of barrier films be combined with each other when bundling, forms new composite diaphragm.
Shown in Fig. 2 a and Fig. 2 b, the utility model also provides a kind of lithium battery composite diaphragm 101, and composite construction is specifically as follows three layers of barrier film: two-layer nonwoven barrier film 102 and one deck ion diaphragm 103, ion diaphragm 103 is between two-layer nonwoven barrier film 102.The preparation method can utilize the cut-off knife of cutting that two kinds of barrier films are combined with each other for after ion diaphragm 102 and two layers of polypropylene nonwoven fabrics 103 are superposeed, and forms new composite diaphragm.
Shown in Fig. 3 a, the utility model also provides a kind of diaphragm bag, and diaphragm bag is to be made with the composite diaphragm in the previous embodiment.Diaphragm bag side and lower end are provided with packaging belt 204, form down the bag shape of end closure upper end open-ended, and size and pole piece size adapt.
Preferably, shown in Fig. 3 b,, in the middle of diaphragm bag, be provided with packaging belt 204, make diaphragm bag be divided at least two son bags for the new core strueture with continuous lamination adapts.Particularly, the number of son bag is corresponding with the folding number of plies of the pole piece that needs encapsulation.Preferably, being arranged on of packaging belt carried out diaphragm bag when encapsulation to pole piece and finished by heat-sealing according to the folding interval on the pole piece.
The diaphragm bag that the utility model provides is used to adorn positive plate or negative plate, and sealing has all around been avoided because the internal short-circuit of battery that utmost point powder comes off and might cause; Do not have exposed positive plate or negative plate simultaneously, thereby do not have direct contact the between positive plate and the negative plate, avoided having improved the security performance of battery greatly because of the direct short circuit problem that causes of contact of positive/negative plate.
Preparation method and method for packing with regard to diaphragm bag specifically describes below:
S1: with ionic membrane and polypropylene compound after, the waste heat that utilizes the cut-off knife of cutting to produce when bundling is combined with each other two kinds of barrier films, forms new composite diaphragm;
S2: utilize heat sealing machine that three faces of composite diaphragm are sealed, make diaphragm bag 308;
S3: in the pole piece 306 that will cut (positive pole or the negative pole) diaphragm bag of packing into and seal;
Particularly, a certain amount of both positive and negative polarity active material, adhesive and solvent fully are mixed and made into anode and cathode slurry with certain ratio, slurry is coated on the both positive and negative polarity collector equably, obtain positive/negative plate after the dry calendering; With the positive/negative plate ora terminalis bonding or the welding certain width lug 305; Shown in Fig. 4 a, the positive/negative plate 306 of moulding is put into diaphragm bag 308; Shown in Fig. 4 b, the upper end is sealed with heat sealing machine; Lug 305 is exposed at the outside of diaphragm bag 308.
Preferably, when the mode of lamination was continuous lamination shown in Fig. 6 d, shown in Fig. 4 a, step S3 was specially:
Particularly, a certain amount of both positive and negative polarity active material, adhesive and solvent fully are mixed and made into anode and cathode slurry with certain ratio, slurry is coated on the both positive and negative polarity collector equably, obtain positive/negative plate after the dry calendering; Lug 305 with welding certain width on the pad 309 of positive/negative plate ora terminalis; Shown in Fig. 5 a, the positive plate of moulding is put into diaphragm bag 308; Shown in Fig. 5 b, seal on folding gap according to the folding gap on the positive plate with heat sealing machine; Reusable heat envelope machine seals the upper end of diaphragm bag 308, lug 305 is exposed at the outside of diaphragm bag 308.
Compare with the lamination that separates shown in Fig. 6 c, the technology for manufacturing electric core of lamination is simpler continuously.Separating lamination need seal each negative or positive electrode of sharing, and if any 4 lamination sheets, just need carry out 4 encapsulation, and this continuous lamination only need seal once, can simplified manufacturing technique, and the minimizing manufacturing cost.
S4: the diaphragm bag that is packaged with positive/negative plate is carried out post-processed form lithium battery.
Particularly, will work as above-mentioned barrier film packed be positive plate the time, add a negative plate in the diaphragm bag outside or outside diaphragm bag both sides add two negative plates and build up a combining structure;
When above-mentioned barrier film packed be negative plate the time, add a positive plate in the diaphragm bag outside or outside diaphragm bag both sides add two positive plates and build up a combining structure; Again this combining structure is reeled or lamination.Wherein the mode of Juan Raoing can be the square coiling shown in Fig. 6 a, also can for the circular roll shown in Fig. 6 b around, the mode of lamination can be the separation lamination shown in Fig. 6 c, also can be the continuous lamination shown in Fig. 6 d.
The diaphragm bag that the utility model provides is sealing all around in preparation process, has avoided because the internal short-circuit of battery that utmost point powder comes off and might cause; Do not have exposed positive plate or negative plate simultaneously, thereby do not have direct contact the between positive plate and the negative plate, avoided having improved the security performance of battery greatly because of the direct short circuit problem that causes of contact of positive/negative plate.
More than technical scheme that the utility model embodiment is provided be described in detail, used specific case herein principle and the execution mode of the utility model embodiment are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as restriction of the present utility model.
Claims (6)
1. a lithium battery composite diaphragm is characterized in that, for comprising the composite construction of nonwoven fabrics barrier film and ion diaphragm.
2. lithium battery composite diaphragm as claimed in claim 1 is characterized in that, composite construction is three layers of barrier film: two-layer nonwoven barrier film and one deck ion diaphragm, ion diaphragm is between the two-layer nonwoven barrier film.
3. the diaphragm bag that the lithium battery composite diaphragm that provides according to claim 1 or 2 is made is characterized in that, diaphragm bag is the bag shape of end closure upper end open-ended down, and size and pole piece size adapt.
4. diaphragm bag as claimed in claim 3 is characterized in that, is provided with packaging belt in the middle of diaphragm bag, makes diaphragm bag be divided at least two son bags.
5. diaphragm bag as claimed in claim 4 is characterized in that, the number of described son bag is corresponding with the folding number of plies of the pole piece that needs encapsulation.
6. diaphragm bag as claimed in claim 4 is characterized in that, being arranged on when diaphragm bag encapsulated of described packaging belt obtains by heat-sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205920178U CN201918456U (en) | 2010-10-21 | 2010-10-28 | Lithium battery composite diaphragm and diaphragm bag |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020572148 | 2010-10-21 | ||
| CN201020572148.X | 2010-10-21 | ||
| CN2010205920178U CN201918456U (en) | 2010-10-21 | 2010-10-28 | Lithium battery composite diaphragm and diaphragm bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201918456U true CN201918456U (en) | 2011-08-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205920178U Expired - Fee Related CN201918456U (en) | 2010-10-21 | 2010-10-28 | Lithium battery composite diaphragm and diaphragm bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201918456U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089749A1 (en) * | 2013-12-17 | 2015-06-25 | 深圳市格瑞普电池有限公司 | Lithium-ion battery provided with non-dust cloth |
| CN105390751A (en) * | 2015-12-17 | 2016-03-09 | 佛山市南海区欣源电子有限公司 | High security soft package lithium ion battery core and manufacture method thereof |
-
2010
- 2010-10-28 CN CN2010205920178U patent/CN201918456U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015089749A1 (en) * | 2013-12-17 | 2015-06-25 | 深圳市格瑞普电池有限公司 | Lithium-ion battery provided with non-dust cloth |
| CN105390751A (en) * | 2015-12-17 | 2016-03-09 | 佛山市南海区欣源电子有限公司 | High security soft package lithium ion battery core and manufacture method thereof |
| CN105390751B (en) * | 2015-12-17 | 2023-10-10 | 佛山市欣源电子股份有限公司 | High-safety flexible package lithium ion battery core |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Yichang Lijia Technology Co., Ltd. Assignor: Lijia Power Source Technology (Shenzhen) Co.,Ltd Contract record no.: 2012440020209 Denomination of utility model: Lithium battery composite diaphragm and diaphragm bag Granted publication date: 20110803 License type: Exclusive License Record date: 20120725 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Lijia Power Source Technology (Shenzhen) Co.,Ltd Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Lijia Power Source Technology (Shenzhen) Co.,Ltd Document name: Notification of Termination of Patent Right |
|
| 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: 20110803 Termination date: 20181028 |