CN207338526U - Battery core and secondary cell - Google Patents
Battery core and secondary cell Download PDFInfo
- Publication number
- CN207338526U CN207338526U CN201721341397.6U CN201721341397U CN207338526U CN 207338526 U CN207338526 U CN 207338526U CN 201721341397 U CN201721341397 U CN 201721341397U CN 207338526 U CN207338526 U CN 207338526U
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- Prior art keywords
- pole piece
- projection
- battery core
- lug
- active material
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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
-
- 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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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
This application involves energy storage device technical field, more particularly to a kind of battery core and secondary cell.Battery core includes the first pole piece and the second pole piece, and the first pole piece includes the first noumenon and the first lug for being connected to the first noumenon side, and the first noumenon includes Part I and Part II, and at least one surface of Part I has the first active material；Part II is arranged between Part I and the first lug；Second pole piece includes the second body and is connected to the second lug of the side of the second body, and the second body includes Part III, and at least one surface of Part III has the second active material；The first noumenon is oppositely arranged with the second body along the thickness direction of the first pole piece, and through-thickness, and the projection of the second lug is outside the projection of Part I, and the projection of the first lug is outside the projection of Part III.The application can ensure the charging effect of battery core, prevent battery core from causing to catch fire due to charging short circuit.
Description
Technical field
This application involves energy storage device technical field, more particularly to a kind of battery core and secondary cell.
Background technology
Hot with new-energy automobile market, power battery safety problem increasingly causes the concern of people.And produced
It is one of important step for improving power battery security reliability to the control of battery core security risk in journey.Specifically, battery core by
First pole piece, the second pole piece and the isolation film composition being interval between the first pole piece and the second pole piece, need to be die cut in production
Process makes the first pole piece, the second pole piece form the first lug and the second lug, and electricity then is made by up- coiler or laminating machine
Core.
However, die cutting procedure can cause the edge of the first pole piece and the second pole piece produce burr, burr may pierce through every
From film, the active contacts on the burr and the second pole piece of the first pole piece, or the burr of the second pole piece and the first pole are caused
The active contacts of on piece, make battery core that micro-short circuit or direct short-circuit occur in charging, cause battery core to be filled and do not power on, or even meeting
Battery core is caused to be caught fire.
Utility model content
This application provides a kind of battery core and secondary cell, can solve the above problems.
The first aspect of the application provides a kind of battery core, including：
First pole piece, including the first noumenon and the first lug for being connected to the first noumenon side, the first noumenon
Including Part I and Part II, at least one surface of the Part I has the first active material；Described second
Set up separately and be placed between the Part I and first lug；
Second pole piece, including the second body and be connected to second body side the second lug, described second
Body includes Part III, and at least one surface of the Part III has the second active material；
The first noumenon is oppositely arranged with second body along the thickness direction of first pole piece, and along the thickness
Direction is spent, outside the projection of the Part I, the projection of first lug is located at institute for the projection of second lug
Outside the projection for stating Part III.
Preferably, second body further includes Part IV, the Part IV be located at second lug with it is described
Between Part III.
Preferably, along the thickness direction, the projection of the Part II and projection at least part of the Part IV
It is overlapping.
Preferably, along the thickness direction, the Part IV with the Part II, one is projected in the electricity
In the short transverse of core in the projection of another one.
Preferably, first pole piece is positive plate, and second pole piece is negative plate.
Preferably, it is located at institute along the thickness direction, being projected in the short transverse of the battery core for the Part IV
State in the projection of Part II.
Preferably, it is upper along the thickness direction, the length direction for being projected in first pole piece of the Part I
In in the projection of the Part III.
Preferably, it is respectively provided with first active material along the thickness direction, the opposing sides of the Part I.
Preferably, it is respectively provided with second active material along the thickness direction, the opposing sides of the Part III.
The second aspect of the application provides a kind of secondary cell, including as above any one of them battery core.
The technical solution that the application provides can reach following beneficial effect：
Battery core provided herein, sets Part I and Part II, along the thickness of the first pole piece on the first pole piece
Direction is spent, the projection of the first lug is outside the projection of the Part III of the second pole piece, the throwing of the second lug of the second pole piece
Shadow is located at outside the projection of the Part I of the first pole piece, even if in this way, in die cutting procedure the first pole piece or the second pole piece
Generate burr, burr is not opposite with Part I, Part III, and therefore, burr is difficult and the first active material or the
Two active contacts, so that when battery core charges, micro-short circuit or direct short-circuit, are protected as far as possible caused by can improving burr
The charging effect of battery core is demonstrate,proved, prevents battery core from causing to catch fire due to charging short circuit.
It should be appreciated that the general description and following detailed description of the above are only exemplary, this can not be limited
Application.
Brief description of the drawings
Fig. 1 is a kind of perspective view of specific embodiment of battery core provided herein；
Fig. 2 is a kind of explosive view of specific embodiment of battery core provided herein；
Fig. 3 is the sectional view of the line A-A along Fig. 1.
Reference numeral：
The first pole pieces of 10-；
11- the first noumenons；
111- Part I；
The first active materials of 1111-；
112- Part II；
The first lugs of 12-；
The second pole pieces of 20-；
The second bodies of 21-；
211- Part III；
The second active materials of 2111-；
212- Part IV；
The second lugs of 22-；
30- isolation films；
40- collectors.
Attached drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the application
Example, and be used to together with specification to explain the principle of the application.
Embodiment
The application is described in further detail below by specific embodiment and with reference to attached drawing.
As shown in Figs. 1-3, the embodiment of the present application provides a kind of battery core, which can be made up of winding process,
It can be made up of lamination process.Battery core includes the first pole piece 10 and the second pole piece 20, and the first pole piece 10 includes the first noumenon 11
With the first lug 12 for being connected to 11 side of the first noumenon, the first noumenon 11 includes Part I 111 and Part II 112, the
At least one surface of a part 111 has the first active material 1111；Part II 112 is arranged at Part I 111 and
Between one lug 12.Second pole piece 20 includes the second body 21 and is connected to the second lug 22 of the side of the second body 21, the
Two bodies 21 include Part III 211, and at least one surface of Part III 211 has the second active material 2111.
Specifically, as shown in Figure 1,3, the first noumenon 11 is opposite along the thickness direction X of the first pole piece 10 with the second body 21
Set, and the projection of the second lug 22, outside the projection of Part I 111, the projection of the first lug 12 is located at Part III
Outside 211 projection, wherein, along above-mentioned thickness direction, the projection of the second lug 22 can be with the projection section of Part II 112
Overlap, can also be located at outside the projection of Part II 112, or be fully located in the projection of Part II 112.
Usually, as shown in figure 3, the main body of the first pole piece 10 and the second pole piece 20 is collector 40, collector 40 is in piece
Shape structure, corresponded on collector 40 Part I 111, Part III 211 part coat the first active material 1111 or
Second active material 2111, i.e., form one layer on the surface of collector 40 and contain the first active material 1111 or the second active matter
The coat of matter 2111, so that the part forms Part I 111, Part III 211, uncoated first is active on collector 40
The region of 1111 or second active material 2111 of material forms clear area, Part II 112, the first lug 12, the second lug
22 are respectively positioned on the clear area, and then the collector 40 after coating is cut by die cutting procedure again, so that 40 shape of collector
Into 11 and first lug 12 of the first noumenon, or the second body 21 and the second lug 22 are formed, ultimately form the knot of above-mentioned battery core
Structure, i.e., set Part I 111 and Part II 112 on the first pole piece 10, along the thickness direction X of the first pole piece 10, first
The projection of lug 12 is outside the projection of the Part III 211 of the second pole piece 20, the throwing of the second lug 22 of the second pole piece 20
Shadow is located at outside the projection of the Part I 111 of the first pole piece 10, this structure, since the surface of Part II 112 is without the
One active material 1111, and the line of cut of collector 40 is located at the first pole piece 10 close to the side of the first lug 12, or second
Pole piece 20 is close to the side of the second lug 22, i.e., line of cut is either positioned at clear area or opposite with clear area.In this way, in mould
Even if the first pole piece 10 or the second pole piece 20 generate burr, burr and Part I 111, Part III 211 in cutting process
Not opposite, therefore, burr is difficult to be contacted with the first active material 1111 or the second active material 2111, can improve battery core
Micro-short circuit caused by burr or direct short-circuit during charging, ensure the charging effect of battery core as far as possible, prevent battery core due to charging
Short circuit causes to catch fire.
It should be noted that above-mentioned first active material, 1111 and second active material 2111 is not limited by the side of coating
Formula is formed in the surface of Part I 111 or Part III 211, can also be formed using other manner, such as inkjet printing side
Formula.
It is to be appreciated that battery core further includes the isolation film 30 being arranged between the first pole piece 10 and the second pole piece 20, with every
From the first pole piece 10 and the second pole piece 20, prevent the two is directly contacted from causing short circuit.
In general, along the short transverse Y of battery core, Part II 112 is located at the side of Part I 111, the first lug 12
In the side of Part II 112, and the first lug 12 and the second lug 22 are located at the homonymy of battery core.
In another embodiment of the application, the second body 21 further includes Part IV 212, the surface of Part IV 212
It is upper also to be located at the clear area of the collector 40 of the second pole piece 20, and the 4th without the second active material 2111, i.e. Part IV 212
Part 212 is between the second lug 22 and Part III 211.After battery core using the above structure, due to Part II 112,
Coat is not provided with Part IV 212, therefore, it is possible to increase the collection of 40 and second pole piece 20 of collector of the first pole piece 10
The distance between fluid 40, that is, add the distance between each collector 40 and isolation film 30 of white space, in electric core winding
Or after lamination, even if the edge of the first pole piece 10 and the second pole piece 20 is squeezed, it can also be better protected from burr puncture
Isolation film 30, is further ensured that the security of battery core.Certainly, Part II 112, and the second pole piece are set in only the first pole piece 10
20 when being not provided with Part IV 212 (i.e. the second lug 22 is directly connected with Part III 211), can also increase by the first pole piece 10
Collector 40 and the distance between isolation film 30, and then avoid burr from wearing isolation film 30.
In the various embodiments described above, be projected as first projection of the Part II 112 along above-mentioned thickness direction X, Part IV 212
Along second projection that is projected as of above-mentioned thickness direction X, Part II 112 and the set-up mode of Part IV 212 can use down
State several：
First way, along above-mentioned thickness direction X, the projection of Part II 112 is not weighed with the projection of Part IV 212
Folded, i.e., the first projection is projected on above-mentioned short transverse Y with second to be staggeredly located, and can be located at Part I 111 with the second projection
Along along the projection of above-mentioned thickness direction X；Or first projection positioned at Part III 211 along the projection of above-mentioned thickness direction X.
The second way, along above-mentioned thickness direction X, the projection of Part II 112 and the projection at least portion of Part IV 212
Point overlapping, i.e., the first projection and second is projected on above-mentioned short transverse Y there are overlapping part, in this way, can be contracted
Small battery core improves the volume energy density of battery core along the size on above-mentioned short transverse Y.
, can be with the only first projection and a part of overlapping, the remainder of the two in the second projection in the second way
The two both sides of lap along above-mentioned short transverse Y can be located at.In order to further reduce the volume of battery core, along above-mentioned thickness
In direction X, Part IV 212 and Part II 112, one of which is projected on above-mentioned short transverse Y positioned at another one
In projection, i.e., during the first projection is projected with second, at least part of another one that is located at of one is the one of above-mentioned short transverse Y
Side, as shown in Figure 1,3, the second projection (i.e. the projection of Part III 211) is on above-mentioned short transverse Y without departing from the first projection
(projection of Part II 112).
In charging, the lithium ion in active material on positive plate is moved to the active material on negative plate, in order to anti-
Lithium ion stacked structure caused by only analysing lithium, or even analysis lithium pierces through isolation film 30, along above-mentioned thickness direction X, is set on positive plate
The region of active material is often positioned in setting in the region of active material on negative plate, is positive plate in the first pole piece 10, and second
When pole piece 20 is negative plate, along above-mentioned thickness direction X, being projected on above-mentioned short transverse Y for Part I 111 is located at the 3rd
Divide in 211 projection, i.e., be projected as the 3rd projection, the projection of Part III 211 along above-mentioned thickness direction X, Part I 111
For the 4th projection, then, on above-mentioned short transverse Y, the both ends of the 3rd projection are without departing from the 4th projection.
It should be noted that above-mentioned first pole piece 10 can be negative plate, the second pole piece 20 is positive plate, can also second
Pole piece 20 is negative plate, and the first pole piece 10 is positive plate.In general, the collector 40 of positive plate is copper foil, the collector of negative plate
40 be aluminium foil.
It is to be appreciated that the short circuit manner of positive plate and negative plate have it is following several：The collector of positive plate passes through thereon
Burr and negative plate on active material short circuit, the collector of negative plate pass through the active matter on burr and positive plate thereon
Matter short circuit, the collector short circuit of the collector of positive plate and negative plate, the activity on active material and negative plate on positive plate
Material short circuit, by test of many times, in above-mentioned short circuit manner, the short circuit of the active material on the burr and positive plate of negative plate is made
Into danger it is more other several big.And since the elongation percentage of aluminium foil is bigger than copper foil, when cross cutting, aluminium foil compares copper
Paper tinsel is more also easy to produce burr.In a kind of preferred embodiment, the first pole piece 10 is positive plate, when the second pole piece 20 is negative plate, is adopted
With this setup, when only the first pole piece 10 sets Part II 112, the second pole piece 20 is not provided with Part IV
It when 212, can also ensure burr not only positioned at the outside of Part I 111 and Part III 211, but also can ensure along above-mentioned thickness
Direction X is spent, the projection of Part I 111 is in the projection of Part III 211, so as to prevent burr from piercing through isolation film as far as possible
And the generation of analysis lithium phenomenon.Further, along above-mentioned thickness direction X, the length for being projected in the first pole piece 10 of Part I 111
Spend on the Z of direction in the projection of Part III 211, analysis lithium occurs to be better protected from battery core, or even cause short circuit.It can manage
Xie Di, is setting Part II 112 and during Part IV 212, and the burr of the first pole piece 10 is respectively positioned on Part II 112 or the
One lug 12, the burr of Part IV 212 are located at 212 or second lug 22 of Part IV.
It is positive plate in the first pole piece 10, when the second pole piece 20 is negative plate, preferably along above-mentioned thickness direction X, the 4th
Points 212 be projected on above-mentioned short transverse Y in the projection of Part II 112, i.e., make above-mentioned on above-mentioned short transverse Y
First projection is in the second projection, so that the burr of positive plate is located at the outside of negative plate, in this way, further increasing cathode
The contact difficulty of the burr of piece and the active material of negative plate, the collector of negative plate, to better ensure that the security of battery core.
Clearly as being provided with coat on collector, therefore, (i.e. Part I 111 exists the thickness of Part I 111
Size on above-mentioned thickness direction X) be more than Part II 112 thickness (i.e. Part II 112 is on above-mentioned thickness direction X
Size), when battery core is made by winding method, the stress of Part II 112 is less than the stress of Part I, in this way, also can
Enough reduce the risk that burr pierces through isolation film 30.
Along above-mentioned thickness direction X, Part I 111 includes opposite two sides, can one side only therein have first live
Property material, can also opposite two sides be respectively provided with the first active material, can when opposing sides is respectively provided with the first active material
Increase the space between the collector 40 of 40 and second pole piece 20 of collector of the first pole piece 10, thus further avoid burr with
First active material 1111 or the second active material 2111 contact.
Similarly, include opposite two sides along above-mentioned thickness direction X, Part III 211, can one side only therein have the
Two active materials 2111, can also opposite two sides be respectively provided with the second active material 2111, be respectively provided with the second work in opposing sides
During property material 2111, by increasing capacitance it is possible to increase the space between the collector 40 of 40 and first pole piece 10 of collector of the second pole piece 20, from
And burr is further avoided to be contacted with the first active material 1111 or the second active material 2111.
In order to ensure that the first pole piece 10 is consistent with the second pole piece 20, make the chemical reaction inside battery core more balanced, along upper
Thickness direction X is stated, the opposite two sides of Part I 111 is respectively provided with the first active material 1111, the opposite two sides of Part III 211
It is respectively provided with the second active material 2111.
In addition, present invention also provides a kind of secondary cell, including the battery core described in the various embodiments described above, it is possible to understand that
Ground, secondary cell further include housing and electrolyte, and housing can be duricrust, or soft shell, battery core are arranged in housing, electricity
Solution liquid is arranged in housing, and infiltrates the first pole piece 10 and the second pole piece 20.
The foregoing is merely the preferred embodiment of the application, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
- A kind of 1. battery core, it is characterised in that including：First pole piece, including the first noumenon and the first lug for being connected to the first noumenon side, the first noumenon include Part I and Part II, at least one surface of the Part I have the first active material；The Part II is set It is placed between the Part I and first lug；Second pole piece, including the second body and be connected to second body side the second lug, the second body bag Part III is included, at least one surface of the Part III has the second active material；The first noumenon is oppositely arranged with second body along the thickness direction of first pole piece, and along the thickness side Projection to, second lug is outside the projection of the Part I, and the projection of first lug is positioned at described the Outside the projection of three parts.
- 2. battery core according to claim 1, it is characterised in that second body further includes Part IV, and the described 4th Part is between second lug and the Part III.
- 3. battery core according to claim 2, it is characterised in that along the thickness direction, the projection of the Part II with The projection of the Part IV is least partially overlapped.
- 4. battery core according to claim 3, it is characterised in that along the thickness direction, the Part IV and described the In two parts, one is projected in the short transverse of the battery core in the projection of another one.
- 5. battery core according to claim 2, it is characterised in that first pole piece is positive plate, and second pole piece is Negative plate.
- 6. battery core according to claim 5, it is characterised in that along the thickness direction, the Part IV is projected in In the short transverse of the battery core in the projection of the Part II.
- 7. battery core according to claim 5, it is characterised in that along the thickness direction, the Part I is projected in On the length direction of first pole piece in the projection of the Part III.
- 8. according to claim 1-7 any one of them battery cores, it is characterised in that along the thickness direction, the Part I Opposing sides be respectively provided with first active material.
- 9. according to claim 1-7 any one of them battery cores, it is characterised in that along the thickness direction, the Part III Opposing sides be respectively provided with second active material.
- 10. a kind of secondary cell, it is characterised in that including such as claim 1-9 any one of them battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721341397.6U CN207338526U (en) | 2017-10-18 | 2017-10-18 | Battery core and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721341397.6U CN207338526U (en) | 2017-10-18 | 2017-10-18 | Battery core and secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207338526U true CN207338526U (en) | 2018-05-08 |
Family
ID=62365520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721341397.6U Active CN207338526U (en) | 2017-10-18 | 2017-10-18 | Battery core and secondary cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207338526U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113330631A (en) * | 2020-09-08 | 2021-08-31 | 东莞新能安科技有限公司 | Electrode assembly, electrochemical device, and electronic device |
| CN114122327A (en) * | 2022-01-29 | 2022-03-01 | 宁德时代新能源科技股份有限公司 | Pole piece and secondary battery with same |
| CN115020630A (en) * | 2022-06-23 | 2022-09-06 | 三一技术装备有限公司 | Pole piece and pole piece unit processing method, pole piece, battery and pole lug roller cutting device |
-
2017
- 2017-10-18 CN CN201721341397.6U patent/CN207338526U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113330631A (en) * | 2020-09-08 | 2021-08-31 | 东莞新能安科技有限公司 | Electrode assembly, electrochemical device, and electronic device |
| CN113330631B (en) * | 2020-09-08 | 2022-12-20 | 东莞新能安科技有限公司 | Electrode assembly, electrochemical device, and electronic device |
| CN114122327A (en) * | 2022-01-29 | 2022-03-01 | 宁德时代新能源科技股份有限公司 | Pole piece and secondary battery with same |
| CN115020630A (en) * | 2022-06-23 | 2022-09-06 | 三一技术装备有限公司 | Pole piece and pole piece unit processing method, pole piece, battery and pole lug roller cutting device |
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