CN206401455U - A kind of takeup type battery core - Google Patents
A kind of takeup type battery core Download PDFInfo
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- CN206401455U CN206401455U CN201621440649.6U CN201621440649U CN206401455U CN 206401455 U CN206401455 U CN 206401455U CN 201621440649 U CN201621440649 U CN 201621440649U CN 206401455 U CN206401455 U CN 206401455U
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- Prior art keywords
- battery core
- pole piece
- barrier film
- lug
- takeup type
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The application is related to secondary cell field, specifically, is related to a kind of takeup type battery core.The takeup type battery core of the application includes the flat battery core by the first barrier film, the first pole piece, the second barrier film and the second pole piece coiling, on battery core thickness direction, continuous the first overlapping barrier film in battery core most inner side of the correspondence position of the first lug or the second lug and the second barrier film sum are no more than two layers；Second pole piece is at least that part relative away from the face at battery core center with the second Kong Bo areas on the second Kong Bo areas, the first pole piece includes the first Kong Bo areas in the part of the outermost half-turn positioned at takeup type battery core.The outmost turns of the takeup type battery core of the application set Kong Bo areas, so that vest area is formed in the side of the thickness direction of battery core, so as to improve the security of battery core；Meanwhile, the application is further reducing barrier film in battery core interior roll around shared space, improves the energy density of battery core.
Description
Technical field
The application is related to secondary cell field, specifically, is related to a kind of takeup type battery core.
Background technology
Improved constantly with the demand of battery durable ability, the energy density to polymer Li-ion battery is also constantly being carried
Go out new challenge, conventional method improve the approach of battery energy density mainly for battery component (as using thinner collector,
Barrier film, Soft Roll film etc.) and production technology (such as improving the compacted density of both positive and negative polarity active material to improve unit capacity), but
For example collector, the further reduction of isolation film thickness add the risk that short circuit occurs for battery, many high-energy-densities on the contrary
Battery core face the risk being difficult to by some safety tests, such as acupuncture and hit safety test.Meanwhile, existing winding-structure
Middle innermost layer barrier film inflection is taken up too much space, and the energy density to raising battery is unfavorable.
In consideration of it, special propose the application.
Utility model content
Present invention purpose is to propose a kind of takeup type battery core.
In order to complete the purpose of the application, the technical scheme used for：
A kind of takeup type battery core of the application, the takeup type battery core include by the first barrier film, the first pole piece, the second barrier film and
It is connected with the first lug, second pole piece and connects on the flat battery core of second pole piece coiling, first pole piece
There is the second lug；On the flat battery core thickness direction, the correspondence position of first lug or second lug
Battery core most continuous overlapping first barrier film in inner side and the second barrier film sum are no more than two layers；
Second pole piece is the second Kong Bo areas at least in the part of the outermost half-turn positioned at the takeup type battery core, described
The part relative away from the face at battery core center with the second Kong Bo areas includes the first Kong Bo areas on first pole piece.
It is preferred that, the part relative with the face at the second Kong Bo areas towards the battery core center includes the on first pole piece
One empty set fluid zone.
It is preferred that, on the flat battery core thickness direction, the corresponding position of first lug and second lug
The battery core put most continuous overlapping first barrier film in inner side and the second barrier film sum are no more than two layers.
It is preferred that, on the flat battery core thickness direction, the takeup type battery core most inner side is continuous overlapping described
First barrier film and the second barrier film sum are no more than two layers.
It is preferred that, the initiating terminal of first barrier film is connected with the initiating terminal of second barrier film.
It is preferred that, the site that first pole piece is bent for the first time is the first bending place, of first pole piece
Top to the distance between first bending place be the first pole piece head；The site that second pole piece is bent for the first time
For the second bending place, the distance between initiating terminal of second pole piece to second bending place is the second pole piece head；
First lug is arranged in the first pole piece head, and/or, second lug is arranged at described second
In pole piece head.
It is preferred that, first lug is arranged in the first Kong Bo areas, and/or, second lug is arranged at institute
State in the second Kong Bo areas.
It is preferred that, the site that first pole piece is bent for the first time is the first bending place, second pole piece first
The secondary site bent is the second bending place；First pole piece includes the first active material layer, first active material
The end of layer is the first active material layer end；Second pole piece includes the second active material layer, second active material
The end of layer is the second active material layer end；
First bending place is provided with to the first pole piece between the first active material layer end exposes blank collection
First groove of fluid, first lug is fixed in first groove；And/or, second bending place to described
The second pole piece between two active material layer ends is provided with the second groove for exposing blank collector, and second lug is fixed
In second groove.
It is preferred that, initiating terminal inflection formation first inflection section, institute inside the flat battery core of first pole piece
The inflection site for stating the first inflection section is the first inflection site；And/or, the initiating terminal of second pole piece is in flat electricity
Core inner inflection forms the second inflection section, and the inflection site of the second inflection section is the second inflection site.
It is preferred that, the initiating terminal of the initiating terminal of first barrier film and second barrier film is inside the flat battery core
Inflection forms barrier film revers turn part.
The technical scheme of the application at least has following beneficial effect：
The outmost turns of the takeup type battery core of the application set Kong Bo areas, so as to form horse in the side of the thickness direction of battery core
First area, when battery core is by abusing, short circuit can preferentially occur for vest area, and avoid burning or the safety problem such as explode, so that
Improve the security of battery core；Meanwhile, the application is further reducing barrier film in battery core interior roll around shared space, improves
The energy density of battery core.
Brief description of the drawings
Fig. 1 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 2 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 3 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 4 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 5 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 6 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 7 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 8 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
Fig. 9 is the takeup type core strueture schematic diagram in a certain embodiment of the application；
1- takeup type battery cores；
The pole pieces of 10- first；
The first Kong Bo of 101- areas；
The bending places of 102- first；
The first empty sets of 103- fluid zone；
The pole pieces of 20- second；
The second Kong Bo of 201- areas；
The bending places of 202- second；
The inflection of 203- second section；
The barrier films of 30- first；
The barrier films of 40- second；
The lugs of 50- first；
The lugs of 60- second；
70- barrier film revers turn parts；
80- barrier films ending section.
Embodiment
With reference to specific embodiment, the application is expanded on further.It should be understood that these embodiments are merely to illustrate the application
Rather than limitation scope of the present application.
The invention relates to a kind of takeup type battery core 1, including by the first barrier film 30, the first pole piece 10, the second barrier film
40 and the second flat battery core that winds of pole piece 20, it is connected with the first lug 50, the second pole piece 20 on the first pole piece 10
It is connected with the second lug 60；On battery core thickness direction (T-T ' directions), the correspondence position of the first lug 50 or the second lug 60
Continuous the first overlapping barrier film 30 in battery core most inner side and the sum of the second barrier film 40 be no more than two layers；So as to reduce barrier film and pole
The superposition of ear thickness, further reduces battery core thickness, improves the energy density of battery core.
As shown in figure 1, the first barrier film 30 and the second inflection inside battery core of barrier film 40 form barrier film revers turn part 70, barrier film
Revers turn part 70 is not overlapped on battery core thickness direction with the first lug 50.The design of barrier film revers turn part 70 facilitates electric core winding process
It is middle that barrier film is fixed on volume pin, consequently facilitating production, can improve production efficiency.
In the embodiment of the present application, as shown in figure 1, the second pole piece 20 is at least in the outermost half-turn positioned at takeup type battery core
Part is that part relative away from the face at battery core center with the second Kong Bo areas 201 on the second Kong Bo areas 201, the first pole piece 10 includes
First Kong Bo areas 101；So as to form vest area in the side of the thickness direction of battery core, when battery core is by abusing, vest area can
Occur short circuit with preferential, and avoid burning or the safety problem such as explode, so as to improve the security of battery core.
It is further preferred that part bag relative with the face at the second Kong Bo areas 201 towards battery core center on the first pole piece 10
Include the first empty set fluid zone 103.So as to also form vest between the second Kong Bo areas 201 another side relative with the first pole piece 10
Area, further increases the security of battery core.
It is further preferred that on battery core thickness direction, the battery core of the correspondence position of the first lug 50 and the second lug 60
Continuous the first overlapping barrier film 30 in most inner side and the sum of the second barrier film 40 are no more than two layers；So as to further avoid barrier film and pole
The superposition of ear thickness, further reduces battery core thickness.As shown in Fig. 2 the first barrier film 30 and the second barrier film 40 are inside battery core
Inflection forms barrier film revers turn part 70, and barrier film revers turn part 70 is equal with the first lug 50 and the second lug 60 on battery core thickness direction
It is misaligned.
In the embodiment of the present application, wind for convenience, as seen in figures 3-5, the initiating terminal of the first barrier film 30 and second every
The initiating terminal of film 40 can be joined directly together and connect, i.e., above-mentioned takeup type battery core is prepared using a complete barrier film, so as to simplify system
Standby technique, improves production efficiency.Without the need for the carry out inflection processing to barrier film initiating terminal, so as to further reduce electricity
The thickness of core.In figures 4 and 5, on flat battery core thickness direction, battery core most inner side is without continuous the first overlapping barrier film
30 and second barrier film 40；It is the feelings for most saving barrier film and in Fig. 4, barrier film is joined directly together in the initiating terminal of the first pole piece 10
Condition.
In the embodiment of the present application, the first lug 50 and/or the second lug 60 can be located at the head of pole piece.Such as the institute of Fig. 1~5
Show, the site that the first pole piece 10 is bent for the first time is the first bending place 102, the initiating terminal of the first pole piece 10 is bent to first
Place the distance between 102 is the first pole piece head；The site that second pole piece 20 is bent for the first time is the second bending place 202,
The initiating terminal of second pole piece 20 to the distance between the second bending place 202 be the second pole piece head；First lug 50 is arranged at
In one pole piece head, the second lug 60 is arranged in the second pole piece head.
In the embodiment of the present application, the first lug 50 and/or the second lug 60 can be located at the afterbody of pole piece, as shown in fig. 6,
First lug 50 is arranged in the first Kong Bo areas 101.In addition, the second lug 60 is also disposed in the second Kong Bo areas 201.
In the embodiment of the present application, as shown in fig. 7, the first pole piece 10 includes the first active material layer, the first active material
The end of layer is the first active material layer end；The first pole piece between first bending place the 102 to the first active material layer end
10 are fixed in the first groove provided with the first groove (not shown on figure) for exposing blank collector, the first lug 50.
In addition, the second pole piece 20 includes the second active material layer, the end of the second active material layer is the second active material
It can be also provided with the second pole piece 20 between layer end, second bending place the 202 to the second active material layer end and expose blank collection
Second groove of fluid, the second lug 60 is fixed in the second groove.
Wherein, groove may be designed to the short groove that three side sealing is closed, one side is open, and may be designed as running through pole piece width
Long recess, i.e. two face closures, two sides opening.
In the embodiment of the present application, in the case of not off-energy density, for the ease of batch production, as shown in figure 8,
The inflection inside battery core of the initiating terminal of second pole piece 20 forms the second inflection section 203, and the inflection site of the second inflection section 203 is the
Two inflection sites, the direction of inflection can be identical or opposite with coiling direction.In addition, the initiating terminal of the first pole piece 10 is in battery core
Internal inflection forms the first inflection section, and the inflection site of the first inflection section is the first inflection site.
In the embodiment of the present application, in order to improve the bonding between naked battery core and packaging bag, improve anti-dropping capability, takeup type
Battery core end is provided with one section of barrier film ending section 80 being only made up of the first barrier film 30 and the second barrier film 40, as shown in figure 9, so as to
Increase the frictional force between naked battery core lateral surface and packaging bag, be conducive to improving the drop resistance of battery.Wherein, barrier film ending section
80 can be made up of the first barrier film 3 or the second barrier film 40.
It is further preferred that in the embodiment of the present application, lug can be integrally formed with collector, for example, lug directly by
Collector cutting is formed.Or, lug independently forms and is fixed on corresponding blank collector, or lug is fixed on the recessed of pole piece
On blank collector at groove.It is further preferred that after the welding of the first lug 50 and the first collector maximum gauge be less than or
Equal to 1.5 times of the first lug 50 and the thickness sum of the first collector；And/or, the weldering of the second lug 60 and the second collector
Connect 1.5 times that rear maximum gauge is less than or equal to the thickness sum of the second lug 60 and the second collector.So that lug knot
The thickness of structure is suitable, it is to avoid because the thickness of extreme ear structure is excessive and caused by the excessive defect of welding kesistance, improve the interior of battery core
Portion's symmetry, adds the reliability of extreme ear structure, so as to avoid deformation, improves the overall performance of battery.
In above-mentioned takeup type battery core in the embodiment of the present application, the first pole piece 10 is cathode sheet, and the second pole piece 20 is
Anode pole piece；Or, first pole piece 10 be anode pole piece, the second pole piece 20 be cathode sheet.
It is not for limiting claim, any this area skill although the application is disclosed as above with preferred embodiment
Art personnel can make some possible variations and modification on the premise of the application design is not departed from, therefore the application
The scope that protection domain should be defined by the application claim is defined.
Claims (10)
1. a kind of takeup type battery core, the takeup type battery core is included by the first barrier film, the first pole piece, the second barrier film and the second pole piece
It is connected with the flat battery core of winding, first pole piece on the first lug, second pole piece and is connected with the second pole
Ear；
Characterized in that,
On the flat battery core thickness direction, the battery core of the correspondence position of first lug or second lug is most interior
Continuous overlapping first barrier film in side and the second barrier film sum are no more than two layers；
Second pole piece is the second Kong Bo areas, described first at least in the part of the outermost half-turn positioned at the takeup type battery core
The part relative away from the face at battery core center with the second Kong Bo areas includes the first Kong Bo areas on pole piece.
2. takeup type battery core according to claim 1, it is characterised in that with the second Kong Bo areas on first pole piece
Include the first empty set fluid zone towards the relative part in the face at battery core center.
3. takeup type battery core according to claim 1, it is characterised in that on the flat battery core thickness direction, institute
State continuous overlapping first barrier film in battery core most inner side and described the of the correspondence position of the first lug and second lug
Two barrier film sums are no more than two layers.
4. takeup type battery core according to claim 1, it is characterised in that on the flat battery core thickness direction, institute
Takeup type battery core most continuous overlapping first barrier film in inner side and the second barrier film sum is stated to be no more than two layers.
5. takeup type battery core according to claim 1, it is characterised in that the initiating terminal of first barrier film and described second
The initiating terminal of barrier film is connected.
6. takeup type battery core according to claim 1, it is characterised in that
The site that first pole piece is bent for the first time is the first bending place, the initiating terminal of first pole piece to described the
The distance between one bending place is the first pole piece head；The site that second pole piece is bent for the first time is the second bending
Place, the distance between the initiating terminal of second pole piece to second bending place is the second pole piece head；
First lug is arranged in the first pole piece head, and/or, second lug is arranged at second pole piece
In head.
7. takeup type battery core according to claim 1, it is characterised in that first lug is arranged at the described first empty paper tinsel
Qu Shang, and/or, second lug is arranged in the second Kong Bo areas.
8. takeup type battery core according to claim 1, it is characterised in that the position that first pole piece is bent for the first time
Point is the first bending place, and the site that second pole piece is bent for the first time is the second bending place；First pole piece includes
First active material layer, the end of first active material layer is the first active material layer end；Second pole piece includes
Second active material layer, the end of second active material layer is the second active material layer end,
First bending place is provided with to the first pole piece between the first active material layer end exposes blank collector
The first groove, first lug is fixed in first groove；And/or, second bending place to described second is lived
Property material layer end between the second pole piece be provided with and expose the second groove of blank collector, second lug is fixed on institute
State in the second groove.
9. takeup type battery core according to claim 1, it is characterised in that the initiating terminal of first pole piece is described flat
Inflection forms the first inflection section inside shape battery core, and the inflection site of the first inflection section is the first inflection site；And/or, institute
State initiating terminal inflection formation second inflection section inside the flat battery core of the second pole piece, the inflection of the second inflection section
Site is the second inflection site.
10. takeup type battery core according to claim 1, it is characterised in that the initiating terminal of first barrier film and described
The inflection inside the flat battery core of the initiating terminal of two barrier films forms barrier film revers turn part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621440649.6U CN206401455U (en) | 2016-12-27 | 2016-12-27 | A kind of takeup type battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621440649.6U CN206401455U (en) | 2016-12-27 | 2016-12-27 | A kind of takeup type battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206401455U true CN206401455U (en) | 2017-08-11 |
Family
ID=59510910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621440649.6U Active CN206401455U (en) | 2016-12-27 | 2016-12-27 | A kind of takeup type battery core |
Country Status (1)
| Country | Link |
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| CN (1) | CN206401455U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117499A (en) * | 2020-09-30 | 2020-12-22 | 珠海冠宇电池股份有限公司 | Battery and method for manufacturing battery |
| CN112687831A (en) * | 2020-12-24 | 2021-04-20 | 宁德新能源科技有限公司 | Electrode assembly and secondary battery |
| WO2021195923A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| WO2021195926A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| CN113795939A (en) * | 2020-03-31 | 2021-12-14 | 宁德新能源科技有限公司 | Electrode assembly and battery cell |
| CN114069025A (en) * | 2021-11-17 | 2022-02-18 | 珠海冠宇电池股份有限公司 | Roll up core structure and battery |
| CN115064783A (en) * | 2017-12-01 | 2022-09-16 | 宁德新能源科技有限公司 | Winding type battery cell |
| CN115133142A (en) * | 2021-03-24 | 2022-09-30 | 宁德新能源科技有限公司 | Battery cell, battery and electric equipment |
-
2016
- 2016-12-27 CN CN201621440649.6U patent/CN206401455U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064783A (en) * | 2017-12-01 | 2022-09-16 | 宁德新能源科技有限公司 | Winding type battery cell |
| WO2021195923A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| WO2021195926A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| CN113795939A (en) * | 2020-03-31 | 2021-12-14 | 宁德新能源科技有限公司 | Electrode assembly and battery cell |
| CN113826256A (en) * | 2020-03-31 | 2021-12-21 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| CN113875059A (en) * | 2020-03-31 | 2021-12-31 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| CN113875059B (en) * | 2020-03-31 | 2023-06-06 | 宁德新能源科技有限公司 | Battery cell structure and battery |
| CN112117499A (en) * | 2020-09-30 | 2020-12-22 | 珠海冠宇电池股份有限公司 | Battery and method for manufacturing battery |
| CN112687831A (en) * | 2020-12-24 | 2021-04-20 | 宁德新能源科技有限公司 | Electrode assembly and secondary battery |
| CN112687831B (en) * | 2020-12-24 | 2022-03-22 | 宁德新能源科技有限公司 | Electrode assembly and secondary battery |
| CN115133142A (en) * | 2021-03-24 | 2022-09-30 | 宁德新能源科技有限公司 | Battery cell, battery and electric equipment |
| CN114069025A (en) * | 2021-11-17 | 2022-02-18 | 珠海冠宇电池股份有限公司 | Roll up core structure and battery |
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