CN206322808U - Ultrathin secondary cell battery core - Google Patents
Ultrathin secondary cell battery core Download PDFInfo
- Publication number
- CN206322808U CN206322808U CN201621452180.8U CN201621452180U CN206322808U CN 206322808 U CN206322808 U CN 206322808U CN 201621452180 U CN201621452180 U CN 201621452180U CN 206322808 U CN206322808 U CN 206322808U
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- Prior art keywords
- barrier film
- battery core
- pole piece
- initiating terminal
- lug
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a kind of ultrathin secondary cell battery core, it is the flat battery core that winding is sequentially stacked by the first pole piece, the first barrier film, the second pole piece, the second barrier film, it is in winding, strictly control the winding starting point of the position at each layer of place, make the inside of battery core without blank coil membrane layer, so as to reduce the thickness of battery core, the energy density of secondary cell is improved.In addition, using the barrier film of superthin structure, the first pole piece and the second pole piece structure, also rolling and being provided the foundation for ultra-thin finished product for battery battery core.
Description
Technical field
The utility model is related to field of batteries technology, refers in particular to a kind of ultrathin secondary cell battery core.
Background technology
Wide variety of secondary cell, is all made up of the battery core and shell of secondary cell in the market.Wherein, battery core is
Active component, typically by anode pole piece, cathode pole piece and the barrier film being arranged between anode pole piece and cathode pole piece stacking or
Person's winding is formed.Positive plate includes plus plate current-collecting body and is coated in the positive active material on plus plate current-collecting body surface；Negative plate bag
Include negative current collector and be coated in the negative electrode active material on negative current collector surface.
With the further development of commercial cells, market to the requirement more and more higher of secondary cell energy density (ED),
At present in traditional winding method, the set location of lug is core shift structure, pole piece and membrane winding into flat battery core, every
Need sky around half cycle from film initiating terminal, form the barrier film of two layers of blank coil, not only cause the waste of barrier film, and cause isolation
Film is overlapping in a thickness direction with positive pole ear, negative lug, therefore increases the thickness of battery core so as to which the energy for reducing battery core is close
Degree.In consideration of it, special propose the application.
Utility model content
In view of this, in view of the existing deficiencies of the prior art, its main purpose is to provide a kind of ultrathin type to the utility model
Secondary cell battery core.
To achieve the above object, the utility model is using following technical scheme：
A kind of ultrathin secondary cell battery core, is folded successively by the first pole piece, the first barrier film, the second pole piece, the second barrier film
Put the flat battery core of winding；
First barrier film and the second barrier film are ultrathin multilayer shut-off micropore polyolefin barrier diaphragm, including positioned at middle part
Microporous polyethylene layer, the microporous polypropylene layer positioned at microporous polyethylene layer two sides, positioned at the ceramics of microporous polypropylene layer lateral surface
Layer；
First pole piece is anode composite piece, includes the first nylon layer of the first barrier film of contact, the table of the first nylon layer
Face is provided with positive collector, and the surface of positive collector is provided with positive pole diaphragm；
Second pole piece is composite negative plate, includes the second nylon layer of the first barrier film of contact, the table of the second nylon layer
Face is provided with negative collector, and the surface for bearing collector is provided with cathode membrane；
The center line of the flat battery core in the direction of the width is battery core center line N, and the winding initiating terminal of the first pole piece is
First initiating terminal, the first initiating terminal connects the first lug, and the site that the first pole piece is bent for the first time is the first turning point；Institute
The initiating terminal for stating the first barrier film is the first barrier film head；The second pole piece coiling initiating terminal is the second initiating terminal, the second starting
The second lug of end connection, the site that the second pole piece is bent for the first time is the second turning point；The initiating terminal of second barrier film
For the second barrier film head；
First lug is located at the battery core center line N left and right sides and misaligned, first initiating terminal with the second lug
Positioned at battery core center line N left side；The first barrier film head, the second barrier film head end and the second initiating terminal are respectively positioned on battery core center line N
Right side, the second barrier film head end is concordant with the second initiating terminal, and the first barrier film head extends to battery core center line N right side, and
The second barrier film head end and the second initiating terminal are coated after turnover；First turning point is respectively positioned on battery core center line with the second turning point
N the same side.
As a kind of preferred scheme, the gross thickness of the multilayer shut-off micropore polyolefin barrier diaphragm is 4~20 μm.
As a kind of preferred scheme, the microporous polyethylene thickness degree of first barrier film and the second barrier film is 1.5~6 μm.
As a kind of preferred scheme, the microporous polypropylene layer thickness of first barrier film and the second barrier film is 1~4 μm.
As a kind of preferred scheme, the positive collector of first pole piece is provided with the first lug, the first lug and Zheng Ji
Fluid is structure as a whole；The negative collector of second pole piece is provided with the second lug, and the second lug is integrated with negative collector
Structure.
As a kind of preferred scheme, first lug is aluminium foil strip, and the second lug is nickel foil band.
As a kind of preferred scheme, the 2nd PP around the first PP layers, the cathode membrane around the positive pole diaphragm
Layer.
The utility model has clear advantage and beneficial effect compared with prior art, specifically, by above-mentioned technology
Scheme understand, this secondary cell battery core be by the first pole piece, the first barrier film, the second pole piece, the second barrier film be sequentially stacked winding and
Into flat battery core, it strictly controls the winding starting point of the position at each layer of place in winding, make the inside of battery core without
Blank coil membrane layer is needed, so as to reduce the thickness of battery core, the energy density of secondary cell is improved.In addition, using superthin structure
Barrier film, the first pole piece and the second pole piece structure, also roll and provided the foundation for ultra-thin finished product for battery battery core.
More clearly to illustrate architectural feature of the present utility model and effect, come below in conjunction with the accompanying drawings with specific embodiment pair
The utility model is described in detail.
Brief description of the drawings
Fig. 1 is the schematic perspective view of the battery core of the embodiment of the utility model.
Fig. 2 is the interior roll of the battery core of the embodiment of the utility model around structure chart.
Fig. 3 is the layer structure figure of the barrier film of the first barrier film/second of the embodiment of the utility model.
Fig. 4 is the first pole piece of the embodiment of the utility model and the layer structure figure of the second pole piece.
Fig. 5 is the first lug schematic diagram of the embodiment of the utility model.
Fig. 6 is the first lug schematic diagram of the embodiment of the utility model.
Accompanying drawing identifier declaration：
10th, the first pole piece 11, the first initiating terminal
12nd, the first turning point 13, the first nylon layer
14th, positive collector 15, positive pole diaphragm
16th, the first PP layers
20th, the first barrier film 21, the first barrier film head
22nd, microporous polyethylene layer 23, microporous polypropylene layer
24th, ceramic layer 30, the second pole piece
31st, the second initiating terminal 32, the second turning point
33rd, the second nylon layer 34, negative collector
35th, PP layers of cathode membrane the 36, the 2nd
40th, the second barrier film
41st, the second barrier film head 50, the first lug
60th, the second lug.
Embodiment
It refer to shown in Fig. 1 to Fig. 6, be a kind of that show the concrete structure of the preferred embodiment of the utility model
Ultrathin secondary cell battery core, is to be sequentially stacked volume by the first pole piece 10, the first barrier film 20, the second pole piece 30, the second barrier film 40
Around flat battery core.
Wherein, as shown in Fig. 2 the center line of the flat battery core in the direction of the width is battery core center line N, the first pole piece
10 winding initiating terminal is the first initiating terminal 11, and the first initiating terminal 11 connects the first lug 50, and the first pole piece 10 occurs for the first time
The site of bending is the first turning point 12；The initiating terminal of first barrier film 20 is the first barrier film head 21；Second pole piece
30 winding initiating terminals are the second initiating terminal 31, and the second initiating terminal 31 connects the second lug 60, and the second pole piece 30 occurs curved for the first time
The site of folding is the second turning point 32；The initiating terminal of second barrier film 40 is the second barrier film head 41.
First lug 50 is located at the battery core center line N left and right sides and misaligned, the first with the second lug 60
Top 11 is located at battery core center line N left side；The first barrier film head 21, the second barrier film head 41 and the equal position of the second initiating terminal 31
In battery core center line N right side, the second barrier film head 41 is concordant with the second initiating terminal 31, and the first barrier film head 21 extends to battery core
The second barrier film head 41 and the second initiating terminal 31 are coated behind center line N right side, and turnover；First turning point 12 and
Two turning points 32 are respectively positioned on battery core center line N the same side.So, the inside of battery core is without blank coil membrane layer, so as to reduce electricity
The thickness of core, improves the energy density of secondary cell.
As shown in figure 3, the barrier film 40 of the first barrier film 20 and second is ultrathin multilayer shut-off micropore polyolefin barrier diaphragm,
Including the microporous polyethylene layer 22 positioned at middle part, the microporous polypropylene layer 23 positioned at 22 two sides of microporous polyethylene layer, positioned at micropore
The ceramic layer 24 of the lateral surface of polypropylene layer 23.In the present embodiment, the gross thickness of multilayer shut-off micropore polyolefin barrier diaphragm for 4~
20μm.Microporous polyethylene 22 thickness of layer of the barrier film 40 of first barrier film 20 and second are 1.5~6 μm.First barrier film 20
The thickness of microporous polypropylene layer 23 with the second barrier film 40 is 1~4 μm.So as to which the thickness of the first barrier film 20 and the second barrier film 40 is non-
It is often thin, provide basis for the making of ultra-thin battery core.
As shown in figure 4, first pole piece 10 is anode composite piece, include the first nylon layer of the first barrier film 20 of contact
13, the surface of the first nylon layer 13 is provided with positive collector 14, and the surface of positive collector 14 is provided with positive pole diaphragm 15.Second pole
Piece 30 is composite negative plate, includes the second nylon layer 33 of the first barrier film 20 of contact, the surface of the second nylon layer 33 is provided with negative collection
Fluid 34, the surface for bearing collector 34 is provided with cathode membrane 35.First PP layers 16, the negative pole around the positive pole diaphragm 15
2nd PP layers 36 around diaphragm 35.As shown in figure 5, the positive collector 14 of first pole piece 10 is provided with the first lug 50,
First lug 50 is structure as a whole with positive collector 14；As shown in fig. 6, the negative collector 34 of second pole piece 30 is provided with the
Two lugs 60, the second lug 60 is structure as a whole with negative collector 34.In the present embodiment, first lug 50 is aluminium foil strip,
Second lug 60 is nickel foil band.This structure design make it that battery core has certain flexibility, battery core is realized length and width
0-180 ° of bending and folding on direction are spent, is easy to the installation forming in battery case.
The above, is only preferred embodiment of the present utility model, and not technical scope of the present utility model is made
Any limitation, therefore every any trickle amendment made according to technical spirit of the present utility model to above example, equivalent change
Change with modification, in the range of still falling within technical solutions of the utility model.
Claims (7)
1. a kind of ultrathin secondary cell battery core, is by the first pole piece（10）, the first barrier film（20）, the second pole piece（30）, second
Barrier film（40）It is sequentially stacked the flat battery core of winding；It is characterized in that：
First barrier film（20）With the second barrier film（40）Ultrathin multilayer shut-off micropore polyolefin barrier diaphragm is, including in
The microporous polyethylene layer in portion（22）, the microporous polypropylene layer positioned at microporous polyethylene layer two sides（23）, positioned at microporous polypropylene layer
The ceramic layer of lateral surface（24）；
First pole piece（10）For anode composite piece, include the first nylon layer of the first barrier film of contact（13）, the first nylon layer
Surface be provided with positive collector（14）, the surface of positive collector is provided with positive pole diaphragm（15）；
Second pole piece（30）For composite negative plate, include the second nylon layer of the first barrier film of contact（33）, the second nylon layer
Surface be provided with negative collector（34）, the surface for bearing collector is provided with cathode membrane（35）；
The center line of the flat battery core in the direction of the width is battery core center line N, the first pole piece（10）Winding initiating terminal be
First initiating terminal（11）, the first initiating terminal the first lug of connection（50）, the site that the first pole piece is bent for the first time is first
Turning point（12）；The second pole piece coiling initiating terminal is the second initiating terminal（31）, the second initiating terminal the second lug of connection（60）,
The site that second pole piece is bent for the first time is the second turning point（32）；The initiating terminal of first barrier film is the first diaphragm heads
Portion（21）；Second barrier film（40）Initiating terminal be the second barrier film head（41）；
First lug is located at the battery core center line N left and right sides and misaligned, first initiating terminal with the second lug（11）
Positioned at battery core center line N left side；The first barrier film head（21）, the second barrier film head（41）With the second initiating terminal（31）Equal position
In battery core center line N right side, the second barrier film head is concordant with the second initiating terminal, the first barrier film head（21）Extend in battery core
The second barrier film head and the second initiating terminal are coated behind line N right side, and turnover；First turning point（12）With second turn
At folding（32）It is respectively positioned on battery core center line N the same side.
2. ultrathin secondary cell battery core according to claim 1, it is characterised in that：The multilayer turns off micropore polyolefin
The gross thickness of barrier film is 4~20 μm.
3. ultrathin secondary cell battery core according to claim 2, it is characterised in that：First barrier film and the second barrier film
Microporous polyethylene layer（22）Thickness is 1.5~6 μm.
4. ultrathin secondary cell battery core according to claim 2, it is characterised in that：First barrier film and the second barrier film
Microporous polypropylene layer（23）Thickness is 1~4 μm.
5. ultrathin secondary cell battery core according to claim 1, it is characterised in that：The positive collector of first pole piece
（14）It is provided with the first lug（50）, the first lug is structure as a whole with positive collector；Second pole piece（30）Negative afflux
Body（34）It is provided with the second lug（60）, the second lug is structure as a whole with negative collector.
6. ultrathin secondary cell battery core according to claim 5, it is characterised in that：First lug（50）For aluminium foil
Band, the second lug（60）For nickel foil band.
7. ultrathin secondary cell battery core according to claim 1, it is characterised in that：The positive pole diaphragm（15）Around
First PP layers（16）, the cathode membrane（35）Around the 2nd PP layers（36）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621452180.8U CN206322808U (en) | 2016-12-28 | 2016-12-28 | Ultrathin secondary cell battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621452180.8U CN206322808U (en) | 2016-12-28 | 2016-12-28 | Ultrathin secondary cell battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206322808U true CN206322808U (en) | 2017-07-11 |
Family
ID=59259806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621452180.8U Active CN206322808U (en) | 2016-12-28 | 2016-12-28 | Ultrathin secondary cell battery core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206322808U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103470A (en) * | 2020-09-29 | 2020-12-18 | 宁德新能源科技有限公司 | Secondary battery and battery module |
| WO2023246202A1 (en) * | 2022-06-23 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
-
2016
- 2016-12-28 CN CN201621452180.8U patent/CN206322808U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103470A (en) * | 2020-09-29 | 2020-12-18 | 宁德新能源科技有限公司 | Secondary battery and battery module |
| CN112103470B (en) * | 2020-09-29 | 2022-02-22 | 宁德新能源科技有限公司 | Secondary battery and battery module |
| WO2023246202A1 (en) * | 2022-06-23 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric device |
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