CN106058296A - Secondary battery cell - Google Patents
Secondary battery cell Download PDFInfo
- Publication number
- CN106058296A CN106058296A CN201610638640.4A CN201610638640A CN106058296A CN 106058296 A CN106058296 A CN 106058296A CN 201610638640 A CN201610638640 A CN 201610638640A CN 106058296 A CN106058296 A CN 106058296A
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- China
- Prior art keywords
- lug
- battery core
- distance
- barrier film
- pole piece
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of a secondary battery and concretely relates to a secondary battery cell. The secondary battery cell is a coiled flat cell, an initiating terminal of a first pole sheet is a first initiating terminal, an initiating terminal of a second pole sheet is a second initiating terminal, the central line of the flat cell along a width direction is a cell central line, a first folded position of the first pole sheet is a first folded position, a line going through the first folded position and parallel to the cell central line is a folded lime, a distance between the first initiating terminal and/or the second initiating terminal is less than a distance between the cell central line and the folded line, and a first tab and a second tab are located at the same side of the cell central line and are not coincident. The secondary battery cell is free of an inner empty coil diaphragm layer so that cell thickness is reduced and secondary battery energy density is improved.
Description
Technical field
The application relates to secondary cell field, specifically, relating to a kind of secondary cell battery core.
Background technology
The most wide variety of secondary cell, all battery core and shell by secondary cell form.Wherein, battery core is
Active component, typically by anode pole piece, cathode pole piece and the barrier film stacking being arranged between anode pole piece and cathode pole piece or
Person's winding forms.Positive plate includes plus plate current-collecting body and is coated in the positive active material of anode collection surface；Negative plate bag
Include negative current collector and be coated in the negative electrode active material of negative pole currect collecting surface.
Along with the further development of commercial cells, market is more and more higher to the requirement of secondary cell energy density (ED),
In the most traditional winding method, as depicted in figs. 1 and 2, the position that arranges of lug is also core shift structure, pole piece and membrane winding
Becoming the battery core of flat, isolating membrane initiating terminal needs empty around half cycle, forms the isolating membrane of two-layer blank coil, not only causes isolating membrane
Waste, and make isolating membrane and positive pole ear, negative lug the most overlapping, therefore increase battery core thickness thus
Reduce the energy density of battery core.
In consideration of it, special, the application is proposed.
Summary of the invention
The primary goal of the invention of the application is to propose a kind of secondary cell battery core.
In order to complete present invention purpose, the technical scheme of employing is:
The application relates to a kind of secondary cell battery core, described secondary cell battery core be by the first pole piece, the first barrier film, second
The flat battery core that pole piece, the second barrier film are sequentially stacked and wind, the head of described first pole piece is Kong Bo district and is electrically connected
Being connected to the first lug, the head of described second pole piece is Kong Bo district and is electrically connected with the second lug；Initiateing of described first pole piece
End is the first top, and the initiating terminal of described second pole piece is the second initiating terminal；Described flat battery core is in the direction of the width
Centrage is battery core center line；Described first pole piece occurs for the first time the site of bending to be the first bending place, by described first curved
At folding and the line parallel with described battery core center line is folding line；The initiating terminal of described first barrier film is between described second lug
Distance is the first barrier film head, and the distance between the initiating terminal of described second barrier film to described second lug is the second diaphragm heads
Portion；
Described the first top and/or described second initiating terminal arrive to the distance of described folding line less than described battery core center line
Distance between described folding line；Described first lug is positioned at the homonymy of described battery core center line with described second lug and does not weighs
Close.
Preferably, described first barrier film head is put down along the length direction of described flat battery core with described second barrier film head
Row is arranged.
Preferably, described first barrier film head is formed in the internal inflection of described flat battery core with described second barrier film head
Barrier film inflection section, described barrier film inflection Duan Jun does not overlaps with described first lug and described second lug.
Preferably, the inflection point of described barrier film inflection section is arranged at around described battery core center line.
Preferably, described the first top to described folding line distance less than described battery core center line to described folding line it
Between distance, the distance between described first lug to described folding line more than the second lug between described folding line away from
From.
Preferably, described first barrier film head is formed in the internal inflection of described flat battery core with described second barrier film head
Barrier film inflection section, described barrier film inflection section is positioned between described first lug and described second lug.
Preferably, described second initiating terminal to the distance of folding line less than described battery core center line between described folding line
Distance, the distance between described first lug to folding line is less than the distance between the second lug to folding line.
Preferably, described first lug to the distance between described folding line less than the second lug to described folding line between
Distance, the distance of described second initiating terminal to folding line more than described battery core center line to the distance between described folding line, institute
Stating the second initiating terminal to the distance between described second lug is the second pole piece head；Described second pole piece head and described first
Barrier film head is bent to form inflection section together with the second barrier film head.
Preferably, the first lug described in described inflection Duan Buyu and described second lug overlap.
Preferably, described first pole piece is anode pole piece, and described first lug is positive pole ear, and described second pole piece is negative
Pole pole piece, described second lug is negative lug；Or, described first pole piece is cathode pole piece, and described first lug is negative pole
Lug, described second pole piece is anode pole piece, and described second lug is positive pole ear.
The technical scheme of the application at least has a following beneficial effect:
The secondary cell battery core of the application, without one layer of membrane layer of blank coil again inside battery core, thus decreases the thickness of battery core
Degree, improves secondary cell energy density.
Accompanying drawing explanation
Fig. 1 is existing secondary core strueture schematic diagram；
Fig. 2 is existing secondary core strueture schematic diagram；
Fig. 3 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 4 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 5 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 6 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 7 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 8 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application；
Fig. 9 is the secondary core strueture schematic diagram in a certain detailed description of the invention of the application.
Wherein:
1-flat battery core；
10-the first pole piece；11-the first lug；101-the first top；102-the first bending place；
20-the second pole piece；21-the second lug；201-the second initiating terminal；
30-the first barrier film；301-the first barrier film head；
40-the second barrier film；401-the second barrier film head；
L-battery core center line.
Detailed description of the invention
Below in conjunction with specific embodiment, the application is expanded on further.Should be understood that these embodiments are merely to illustrate the application
Rather than restriction scope of the present application."front", "rear" described in literary composition is all with the laying state of the secondary cell battery core in accompanying drawing
For reference.
The application relates to a kind of secondary cell battery core, by first pole piece the 10, first barrier film the 30, second pole piece 20, second every
The flat battery core 1 that film 40 is sequentially stacked and winds, the head of the first pole piece 10 is Kong Bo district and is electrically connected with the first pole
Ear 11, the head of the second pole piece 20 is Kong Bo district and is electrically connected with the second lug 21, the first pole piece 10 include the first collector and
Being coated on first active material layer on the first collector two surface, the second pole piece 20 includes the second collector and is coated on the second collection
Second active material layer on fluid two surface；
The initiating terminal of the first pole piece 10 is the first top 101, and the initiating terminal of the second pole piece is the second initiating terminal 201, the
One pole piece 10 occurs the site of bending to be the first bending place 102 for the first time, puts down by the first bending place 102 and with battery core center line L
The line of row is folding line；The initiating terminal of the first barrier film 30 is the first barrier film head 301 to the distance between the second lug 21, second
The initiating terminal of barrier film 40 is the second barrier film head 401 to the distance between the second lug 21, and flat battery core 1 is in the direction of the width
Centrage be battery core center line L；
The first top 101 and/or the second initiating terminal 201 to folding line distance less than battery core center line L to folding line it
Between distance；First lug 11 and the second lug 21 are positioned at the homonymy of battery core center line L and misaligned.At the application pole piece and barrier film
During winding battery core, when pole piece and barrier film edge counterclockwise or are wound clockwise, the first lug 11 and the second lug
21 homonymies being respectively positioned on battery core center line L, the first barrier film head 301 and the second barrier film head 401 form the initial layers of battery core, it is not necessary to
One layer of membrane layer of blank coil again, thus decrease the thickness of battery core.And in the prior art, as depicted in figs. 1 and 2, the first lug
11 lay respectively on different layers from barrier film initiation region, and the second lug 21 is positioned on different layers from barrier film initiation region, every
Film initiation region formed blank coil membrane layer, the membrane layer of blank coil be electrically connected with the first pole piece 10 of the first lug 11 and be electrically connected
The thickness of the second pole piece 20 being connected to the second lug 21 is superimposed, adds the thickness of battery core, have impact on the energy of secondary cell
Density.
In this application, the first barrier film head 301 is parallel along the length direction of flat battery core with the second barrier film head 401
Arrange, it is possible to inflection occurs inside battery core further, and the direction of inflection can be identical or different with electric core winding direction.
In this application, the first barrier film 30 and the second barrier film 40 can equal or different length, convenient in order in the course of processing
Property, preferred length is identical or has the assembling deviation of several millimeters.Preferably, the initiating terminal of the first barrier film 30 is between folding line
The initiating terminal of distance and the second barrier film 40 is 0～5mm to the difference between the distance between folding line.
In this application, the initiating terminal of the first barrier film to the distance between folding line be smaller than battery core center line to folding line it
Between distance, the distance between the initiating terminal of the second barrier film to folding line is smaller than battery core center line to the distance between folding line；
The initiating terminal of the i.e. first barrier film, the initiating terminal of the second barrier film and the first lug, the second lug are positioned at the homonymy of battery core center line, such as figure
Shown in 3, the length of the first barrier film and the second barrier film only needs to meet will not come in contact i.e. between the first pole piece and the second pole piece
Can.In secondary cell battery core as shown in Figure 3, the distance at the first top 101 to folding line is less than battery core center line L to folding line
Between distance；First lug 11 to the distance between folding line more than the distance between the second lug 21 to folding line, i.e. the
One lug 11 is front, and the second lug 21 is rear.First barrier film head 301 and the second barrier film head 401 are straight, form battery core
Initial layers, the distance between the second initiating terminal 201 to folding line less than the first lug 11 to the distance between folding line, to keep away
Exempt between the collector of the second pole piece and the first lug, to form thickness and form superposition.
In this application, the initiating terminal of the first barrier film to the distance between folding line can more than battery core center line to folding line it
Between distance, the distance between the initiating terminal of the second barrier film to folding line can be more than battery core center line to the distance between folding line；
The initiating terminal of the i.e. first barrier film, the initiating terminal of the second barrier film and the first lug, the second lug lay respectively at the both sides of battery core center line.
As shown in Figure 4, although relatively Fig. 3 wastes portion septum, but the winding of battery core of being more convenient for, and the symmetry of battery core can be increased,
The battery core thickness avoiding lug offside is too small.
In this application, the first barrier film head 301 and the second barrier film head 401 carry out inflection inside flat battery core 1
Forming barrier film revers turn part, barrier film revers turn part does not overlaps with the first lug 11 and the second lug 21.Barrier film revers turn part not with lug
Overlap, thus without the thickness increasing battery core.Second pole piece can be completely enclosed after barrier film inflection, thus ensure that isolation effect
Really.
In this application, the inflection point of barrier film revers turn part is arranged at around battery core center line L, i.e. barrier film revers turn part can be along battery core
Near the L of center, position carries out inflection, as shown in Figure 5.Meanwhile, barrier film revers turn part may be alternatively located at the same of the first lug and the second lug
Side, the i.e. inflection point of barrier film revers turn part are arranged between the first lug and the second lug, as shown in Figure 6.Further, barrier film returns
Folding part may also be disposed on the first lug and the offside of the second lug.
In this application, as it is shown in fig. 7, the distance between the first lug 11 to folding line arrives curved less than the second lug 21
During distance between broken line, i.e. when the second lug 21 at front, the first lug 11 when rear, the second initiating terminal 201 arrives folding line
Distance is less than the distance between battery core center line L to folding line；The first top 101 is less than the second pole to the distance between folding line
Ear 21 is to the distance between folding line, to avoid the thickness between the collector of the first pole piece and the second lug to form superposition.
In this application, as shown in Figure 8, the distance between the first lug 11 to folding line arrives curved less than the second lug 21
During distance between broken line, at once the second lug 21 at front, the first lug 11 when rear；Second initiating terminal 201 arrives folding line
Distance is less than the distance between battery core center line L to folding line；The first top 101 is less than the second pole to the distance between folding line
Ear 21 to the distance between folding line, forms superposition to avoid forming thickness between the collector of the first pole piece and the second lug.
First barrier film head 301 and the second barrier film head 401 carry out inflection inside flat battery core 1 and form barrier film revers turn part, barrier film
Revers turn part does not overlaps with the first lug 11 and the second lug 21, to avoid thickness superposition.
In this application, as it is shown in figure 9, the distance between the first lug 11 to folding line arrives curved less than the second lug 21
During distance between broken line, the distance of the second initiating terminal 201 to folding line more than the distance between battery core center line L to folding line,
Distance between second initiating terminal the 201 to the second lug is the second pole piece head；Second pole piece head and the first barrier film head 301
Inflection forms revers turn part together with the second barrier film head 401, and revers turn part does not overlaps with the first lug 11 and the second lug 21, to keep away
Exempt from thickness superposition.
In above detailed description of the invention, the first pole piece 10 is anode pole piece, and the first lug 11 is positive pole ear, the second pole
Sheet 20 is cathode pole piece, and the second lug 21 is negative lug；Or, the first pole piece 10 is cathode pole piece, and the first lug 11 is negative
Pole lug, the second pole piece 20 amasss sheet for positive pole, and the second lug 21 is positive pole ear.According to the needs of design, the first barrier film is permissible
It is combined into a barrier film with the second barrier film.
Although the application is open as above with preferred embodiment, but is not for limiting claim, any this area skill
Art personnel, on the premise of conceiving without departing from the application, can make some possible variations and amendment, therefore the application
Protection domain should be defined in the range of standard with the application claim.
Claims (10)
1. a secondary cell battery core, described secondary cell battery core be by the first pole piece, the first barrier film, the second pole piece, second every
The flat battery core that film is sequentially stacked and winds, the head of described first pole piece is Kong Bo district and is electrically connected with the first pole
Ear, the head of described second pole piece is Kong Bo district and is electrically connected with the second lug；It is characterized in that,
The initiating terminal of described first pole piece is the first top, and the initiating terminal of described second pole piece is the second initiating terminal；Described flat
Flat-shaped battery core centrage in the direction of the width is battery core center line；Described first pole piece occurs the site of bending to be first for the first time
Bending place, is folding line by described first bending place and the line parallel with described battery core center line；Initiateing of described first barrier film
Holding the distance between described second lug is the first barrier film head, the initiating terminal of described second barrier film to described second lug it
Between distance be the second barrier film head；
Described the first top and/or described second initiating terminal to the distance of described folding line less than described battery core center line to described
Distance between folding line；Described first lug and described second lug are positioned at the homonymy of described battery core center line and misaligned.
Secondary cell battery core the most according to claim 1, it is characterised in that described first barrier film head with described second every
Film head be arranged in parallel along the length direction of described flat battery core.
Secondary cell battery core the most according to claim 1, it is characterised in that described first barrier film head with described second every
Film head forms barrier film inflection section in the internal inflection of described flat battery core, described barrier film inflection Duan Jun not with described first lug
Overlap with described second lug.
Secondary cell battery core the most according to claim 3, it is characterised in that the inflection point of described barrier film inflection section is arranged at
Around described battery core center line.
Secondary cell battery core the most according to claim 1, it is characterised in that described the first top is to described folding line
Distance is less than the distance between described battery core center line to described folding line, the distance between described first lug to described folding line
More than the distance between the second lug to described folding line.
Secondary cell battery core the most according to claim 5, it is characterised in that described first barrier film head with described second every
Film head forms barrier film inflection section in the internal inflection of described flat battery core, described barrier film inflection section be positioned at described first lug and
Between described second lug.
Secondary cell battery core the most according to claim 1, it is characterised in that described second initiating terminal is to described folding line
Distance is less than the distance between described battery core center line to described folding line, the distance between described first lug to described folding line
Less than the distance between the second lug to described folding line.
Secondary cell battery core the most according to claim 1, it is characterised in that between described first lug to described folding line
Distance less than the second lug to the distance between described folding line, the distance of described second initiating terminal to described folding line is more than
Described battery core center line is to the distance between described folding line；Described second initiating terminal is to the distance between described second lug
Two pole piece heads, the inflection together with described first barrier film head and described second barrier film head of described second pole piece head is formed back
Trisection.
Secondary cell battery core the most according to claim 8, it is characterised in that the first lug described in described inflection Duan Buyu and
Described second lug overlaps.
10. according to the secondary cell battery core described in claim 1～9 any one, it is characterised in that described first pole piece is just
Pole pole piece, described first lug is positive pole ear, and described second pole piece is cathode pole piece, and described second lug is negative lug；
Or, described first pole piece is cathode pole piece, and described first lug is negative lug, and described second pole piece is anode pole piece, institute
Stating the second lug is positive pole ear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638640.4A CN106058296B (en) | 2016-08-05 | 2016-08-05 | A kind of secondary cell battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638640.4A CN106058296B (en) | 2016-08-05 | 2016-08-05 | A kind of secondary cell battery core |
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| Publication Number | Publication Date |
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| CN106058296A true CN106058296A (en) | 2016-10-26 |
| CN106058296B CN106058296B (en) | 2019-02-05 |
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| CN201610638640.4A Active CN106058296B (en) | 2016-08-05 | 2016-08-05 | A kind of secondary cell battery core |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106803565A (en) * | 2017-02-28 | 2017-06-06 | 宁德新能源科技有限公司 | Battery |
| WO2018036489A1 (en) * | 2016-08-23 | 2018-03-01 | 宁德新能源科技有限公司 | Spiral-wound battery |
| CN108598491A (en) * | 2018-06-22 | 2018-09-28 | 宁德时代新能源科技股份有限公司 | Secondary battery and pole piece thereof |
| CN109524606A (en) * | 2018-11-05 | 2019-03-26 | 宁德新能源科技有限公司 | Pole piece, battery core and battery |
| WO2019200538A1 (en) * | 2018-04-17 | 2019-10-24 | 宁德新能源科技有限公司 | Battery cell and battery |
| CN111081905A (en) * | 2018-10-18 | 2020-04-28 | 宁德新能源科技有限公司 | Packaging bag and battery |
| WO2021195906A1 (en) * | 2020-03-31 | 2021-10-07 | 东莞新能安科技有限公司 | Electrochemical apparatus and electronic apparatus using electrochemical apparatus |
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| WO2021195906A1 (en) * | 2020-03-31 | 2021-10-07 | 东莞新能安科技有限公司 | Electrochemical apparatus and electronic apparatus using electrochemical apparatus |
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| Publication number | Publication date |
|---|---|
| CN106058296B (en) | 2019-02-05 |
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