CN208819984U - Electrode assembly and secondary cell - Google Patents
Electrode assembly and secondary cell Download PDFInfo
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- CN208819984U CN208819984U CN201821778805.9U CN201821778805U CN208819984U CN 208819984 U CN208819984 U CN 208819984U CN 201821778805 U CN201821778805 U CN 201821778805U CN 208819984 U CN208819984 U CN 208819984U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a kind of electrode assembly and secondary cell.Electrode assembly includes the first pole piece, the second pole piece and diaphragm, and diaphragm is set between the first pole piece and the second pole piece.First pole piece includes the first collector and the first active material layer, and the first collector includes the first protrusion of the first main part and uncoated first active material layer coated with the first active material layer.Second pole piece includes the second collector and the second active material layer, and the second collector includes the second protrusion of the second main part and uncoated second active material layer coated with the second active material layer.First active material layer is equipped with first buffering area domain, the thickness of the thickness in first buffering area domain less than other regions of the first active material layer in the end close to the first protrusion.Diaphragm includes matrix part and the first extension, and the first extension extends from one end of matrix part, and the thickness of the first extension is greater than the thickness of matrix part.First extension is opposite with the first buffering area domain of the first active material layer.
Description
Technical field
The utility model relates to field of batteries more particularly to a kind of electrode assemblies and secondary cell.
Background technique
The electrode assembly of secondary cell is the core component that it realizes charging/discharging function, and electrode assembly is usually by first
Pole piece 1, diaphragm 3 and the second pole piece 2 are wound, wherein the first pole piece 1 and 2 polarity of the second pole piece on the contrary, diaphragm 3 by first
Pole piece 1 and the second pole piece 2 separate.Referring to Fig.1, the first pole piece 1 include the first collector 11 and the first active material layer 12, first
Collector 11 includes the of the first main part 111 and uncoated first active material layer 12 coated with the first active material layer 12
One protrusion 112.In the forming process of the first pole piece 1, it usually needs the first active material layer of roll-in 12, to improve the first activity
The density of material layer 12.
However, due between the first active material layer 12 and the first protrusion 112 there are difference in height, in roll-in, answer
Power is concentrated in the intersection of the first active material layer 12 and the first protrusion 112, and the first active material layer 12 is caused to fall off, and first
It is cracked on collector 11.In order to discharge stress, it will usually reduce the first active material layer 12 close to the first protrusion 112
The thickness of end, and then form a lesser region of thickness.
In electrode assembly, the lesser region of thickness will increase the first active material layer 12 and diaphragm 3 in end
Gap, be unfavorable for the performance of capillarity, can reduce in this way electrolyte infiltration electrode assembly speed.Meanwhile gap increases
When can extend the transmission path of lithium ion, cause polarization to become larger and cause analysis lithium, influence the performance of secondary cell.
Utility model content
In view of the problems in the background art, the purpose of this utility model is to provide a kind of electrode assemblies and secondary electricity
Pond can improve the wellability of electrolyte, avoid analysis lithium, improve the performance of secondary cell.
To achieve the goals above, the utility model provides a kind of electrode assembly and secondary cell.
Electrode assembly includes the first pole piece, the second pole piece and diaphragm, and diaphragm is set between the first pole piece and the second pole piece.
First pole piece includes the first collector and the first active material layer for being set to the first collection liquid surface, and the first collector includes applying
It is covered with the first main part of the first active material layer and the first protrusion of uncoated first active material layer.Second pole piece includes the
Two collectors and the second active material layer for being set to the second collection liquid surface, the second collector include being coated with the second active matter
Second protrusion of the second main part of matter layer and uncoated second active material layer.First active material layer is close to the first protrusion
End be equipped with first buffering area domain, and the thickness in first buffering area domain is less than the thickness in other regions of the first active material layer
Degree.Diaphragm includes matrix part and the first extension, and matrix part is between the first active material layer and the second active material layer, and
One extension extends from one end of matrix part, and the thickness of the first extension is greater than the thickness of matrix part.First extension and
The first buffering area domain of one active material layer is opposite.
Along the direction close to the first protrusion, the thickness in first buffering area domain is gradually reduced；Direction of the edge far from matrix part, the
The thickness of one extension is gradually increased.
Diaphragm includes substrate and the first coating and second coating for being respectively arranged at two surfaces of substrate.
In one embodiment, substrate includes first part and the second part that extends from first part, and second part
Thickness is greater than the thickness of first part.First part and first coating coated on first part and second coating form matrix
Portion, second part and first coating and second coating the first extension of formation coated on second part.
In one embodiment, first coating includes Part III and the Part IV that extends from Part III, and the 4th
The thickness divided is greater than the thickness of Part III；Region that Part III, substrate are covered by Part III and second coating with
The corresponding region of Part III forms matrix part, region that Part IV, substrate are covered by Part IV and second coating
Region corresponding with Part IV forms the first extension.
In one embodiment, the second active material layer is equipped with second buffering area domain, and the in the end close to the second protrusion
Thickness of the thickness of two buffer areas less than other regions of the second active material layer.First protrusion and the second protrusion are located at described
The same end of electrode assembly；First extending part is between first buffering area domain and second buffering area domain.Preferably, first extends
Portion is prominent relative to two surfaces of matrix part.
In one embodiment, the second active material layer is equipped with second buffering area domain, and the in the end close to the second protrusion
Thickness of the thickness of two buffer areas less than other regions of the second active material layer.Diaphragm further includes the second extension, and first
Extension and the second extension extend from the both ends of matrix part respectively, and the thickness of the second extension is greater than the thickness of matrix part.
First protrusion and the second protrusion are located at the both ends of the electrode assembly.The second of second extension and the second active material layer
Buffer area is opposite.Preferably, the first extension is prominent relative to the surface opposite with the first active material layer of matrix part, the
Two extensions are prominent relative to the surface opposite with the second active material layer of matrix part.
The beneficial effects of the utility model are as follows: and the application is reduced by the thickness of the first extension of increase diaphragm
The wellability of electrolyte is improved to enhance capillarity in gap between first extension and first buffering area domain, shortens lithium
The transmission path of ion avoids analysis lithium, improves the performance of secondary cell.
Detailed description of the invention
Fig. 1 is the schematic diagram of the electrode assembly of the prior art.
Fig. 2 is the schematic diagram according to an embodiment of the secondary cell of the utility model.
Fig. 3 is a schematic diagram of the electrode assembly of Fig. 2.
Schematic diagram after the first pole piece expansion that Fig. 4 is Fig. 3.
Fig. 5 is another schematic diagram of the electrode assembly of Fig. 2.
Fig. 6 is the schematic diagram of the first embodiment of diaphragm.
Fig. 7 is the schematic diagram of the second embodiment of diaphragm.
Fig. 8 is the schematic diagram according to another embodiment of the secondary cell of the utility model.
Fig. 9 is a schematic diagram of the electrode assembly of Fig. 8.
Figure 10 is another schematic diagram of the electrode assembly of Fig. 8.
Figure 11 is the schematic diagram of the 3rd embodiment of diaphragm.
Figure 12 is the schematic diagram of the fourth embodiment of diaphragm.
Wherein, the reference numerals are as follows:
1 first pole piece, 32 first coating
11 first collector, 321 Part III
111 first main part, 322 Part IV
112 first protrusion, 33 second coating
12 first active material layer, 331 Part VI
121 first buffering area domain, 332 Part VII
2 second pole piece, 4 electrode assembly
21 second collector, 5 shell
211 second main part, 6 cover board
212 second protrusion, 7 electrode terminal
22 second active material layers 8 confluence component
221 second buffering area domain P1 matrix parts
3 the first extensions of diaphragm P2
31 the second extensions of substrate P3
311 first part's X width directions
312 second part Y thickness directions
313 Part V Z height directions
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the application and its application or making
Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are in no development creative work premise
Under every other embodiment obtained, shall fall in the protection scope of this application.
In the description of the present application, it is to be understood that limit zero using the words such as " first ", " second ", " third "
Component, it is only for convenient for distinguishing to corresponding components, do not have Stated otherwise such as, above-mentioned word contains there is no special
Justice, therefore should not be understood as the limitation to the application protection scope.
Referring to Fig. 2, the secondary cell of the application can be lithium ion battery.
In the first embodiment, secondary cell includes electrode assembly 4, shell 5, cover board 6, electrode terminal 7 and confluence component
8。
Referring to Fig. 3, electrode assembly 4 includes that the first pole piece 1, the second pole piece 2 and diaphragm 3, diaphragm 3 are set to the first pole piece
1 and second between pole piece 2.First pole piece 1, diaphragm 3 and the second pole piece 2 are stacked and are wound as flat.Electrode assembly 4 is secondary
The core component of battery realization charging/discharging function.
Referring to Fig. 4 and Fig. 5, the first pole piece 1 includes the first collector 11 and is set to the first of 11 surface of the first collector
Active material layer 12, the first collector 11 include the first main part 111 and uncoated the coated with the first active material layer 12
First protrusion 112 of one active material layer 12.First pole piece 1 can be cathode pole piece, and accordingly, the first collector 11 can be copper
Foil, the first active material layer 12 are interior including graphite or silicon isoreactivity material.
First active material layer 12 can be arranged to the surface of the first collector 11 by way of coating.It can be by active material
Slurry is made in (such as graphite or silicon), binder, conductive agent and solvent, then slurry is coated on to two of the first collector 11
Surface forms the first active material layer 12 after slurry curing.
Second pole piece 2 includes the second collector 21 and the second active material layer 22 for being set to 21 surface of the second collector,
Second collector 21 includes the second main part 211 and uncoated second active material layer 22 coated with the second active material layer 22
The second protrusion 212.Second pole piece 2 can be anode pole piece, and the second collector 21 can be aluminium foil, and the second active material layer 22 can wrap
Include LiMn2O4, LiFePO4 isoreactivity material.Second active material layer 22 can also be arranged to the second afflux by way of coating
The surface of body 21.
Shell 5 can have hexahedral shape or other shapes.Accommodating chamber is formed inside shell 5, with 4 He of accommodate electrod component
Electrolyte.Shell 5 forms opening at one end, and electrode assembly 4 can be placed into the accommodating chamber of shell 5 via described be open.Shell 5
It can be made, can also be made of insulating materials such as plastic cement of the material of the conductive metals such as aluminum or aluminum alloy.
Cover board 6 is set to shell 5 and covers the opening of shell 5, so that electrode assembly 4 is enclosed in shell 5.Electrode tip
Son 7 is set to cover board 6, and the upper end of electrode terminal 7 is projected into 6 upside of cover board, and lower end may pass through cover board 6 and extend in shell 5.
Electrode terminal 7 is two and is connected respectively with two confluence components 8.
Referring to Fig. 4, the first pole piece 1 includes multiple spaced first protrusions 112.When the first pole piece 1, diaphragm 3 and
When two pole pieces 2 are wound as electrode assembly 4, the multiple first protrusion, 112 arranged stacked is simultaneously fixed to a confluence component simultaneously
8.Similarly, the second pole piece 2 also includes multiple spaced second protrusions 212, when the first pole piece 1, diaphragm 3 and the second pole piece
2 when being wound as electrode assembly 4, and the multiple second protrusion, 212 arranged stacked is simultaneously fixed to another confluence component 8 simultaneously.
First protrusion 112 and the second protrusion 212 are located at the same end of the electrode assembly 4.Referring to Fig. 2, the first protrusion 112
Electrode assembly 4 can be located at along the upper end of short transverse Z with the second protrusion 212.
Referring to Fig. 5, the first active material layer 12 is equipped with first buffering area domain 121 in the end close to the first protrusion 112, and
Thickness of the thickness in first buffering area domain 121 less than other regions of the first active material layer 12.Due to first buffering area domain 121
Thickness it is smaller, therefore, in the nipping process of the first pole piece 1, pressure suffered by first buffering area domain 121 is smaller, to keep away
Exempt from the removing of the active material in first buffering area domain 121 or fall off, prevents the boundary of the first protrusion 112 and the first main part 111
Place cracks.
Referring to Fig. 6, diaphragm 3 includes that matrix part P1 and the first extension P2, matrix part P1 are located at the first active material layer 12
And second between active material layer 22, the first extension P2 extends from one end of matrix part P1, and the thickness of the first extension P2
Greater than the thickness of matrix part P1.The first buffering area domain 121 of first extension P2 and the first active material layer 12 is opposite.Along height
The ratio between width and the overall width of diaphragm 3 of direction Z, matrix part P1 can be 60%~95%.The thickness of matrix part P1 is uniform.
If 3 integral thickness of diaphragm is uniform, after 4 coiling and molding of electrode assembly, first buffering area domain 121 and diaphragm
Gap between 3 is bigger than normal, and gap bigger than normal is unfavorable for the performance of capillarity, and the speed for causing electrolyte to infiltrate reduces.Meanwhile
Gap bigger than normal can also extend the transmission path of lithium ion, cause polarization to become larger and cause analysis lithium, influence the performance of secondary cell.
And the application reduces the buffering of the first extension P2 and first by the thickness of the first extension P2 of increase diaphragm 3
The wellability of electrolyte is improved to enhance capillarity in gap between region 121, shortens the transmission path of lithium ion, keeps away
Exempt to analyse lithium, improves the performance of secondary cell.
Along the direction close to the first protrusion 112, the thickness in first buffering area domain 121 is gradually reduced, in this way can be in roll-in
Dispersive stress in the process avoids the removing of the active material in first buffering area domain 121 or falls off, and prevents the first protrusion 112 and
The intersection of one main part 111 cracks.Accordingly, between guarantee first buffering area domain 121 and the first extension P2
In the range of setting, along the direction far from matrix part P1, the thickness of the first extension P2 is gradually increased in gap.
Diaphragm 3 includes substrate 31 and the first coating 32 and second coating 33 that are respectively arranged at 31 two surfaces of substrate.Base
Material 31 can for polyethylene (PE) film, polypropylene (PP) film, PP PE PP sandwich diaphragm.
First coating 32 and second coating 33 can be ceramic coating.The ceramic coating include but be not limited to aluminium, titanium,
One of barium, the oxide of silicon, nitride, carbide are a variety of.Preferably, the ceramic coating includes aluminium oxide.Oxidation
Aluminized coating has heat-resisting quantity, the intact form of diaphragm 3 is still able to maintain at 180 DEG C, aluminum oxide coating layer can also neutralize electrolysis
The hydrofluoric acid to dissociate in liquid, improves the acid resistance and safety of secondary cell, meanwhile, aluminum oxide coating layer also has good imbibition
And liquid-keeping property.
Certainly, first coating 32 and second coating 33 can also be other coatings.For example, by conducting polymer, solid electrolytic
Slurry is made in matter, binder and solvent, and slurry is applied to two surfaces of substrate 31, forms first coating 32 after slurry curing
With second coating 33.The conducting polymer is selected from polypyrrole, polyaniline, polythiophene, polyhenylene, polyacetylene, polyphenylene ethylene
At least one of with poly bis alkynes, the solid electrolyte is selected from polyethylene glycol oxide base polymer electrolyte, polyvinylidene fluoride
At least one of polymer dielectric, polyacrylonitrile-radical polymer based electrolyte, the binder are selected from carboxymethyl cellulose
Sodium, Kynoar, polyacrylonitrile, polyacrylic acid, polystyrenebutadienes copolymer, polyvinyl alcohol, polyene acid esters, poly- ammonia
At least one of ester, chlorinated rubber and epoxy resin.Conducting polymer and solid electrolyte can be improved the dynamic of secondary cell
Mechanical property.
Second active material layer 22 is equipped with second buffering area domain 221, and the second buffering in the end close to the second protrusion 212
Thickness of the thickness in region 221 less than other regions of the second active material layer 22.Similarly, due to second buffering area domain 221
Thickness it is smaller, therefore, in the nipping process of the second pole piece 2, pressure suffered by second buffering area domain 221 is smaller, to keep away
Exempt from the removing of the active material in second buffering area domain 221 or fall off, prevents the boundary of the second protrusion 212 and the second main part 211
Place cracks.
First extension P2 is between first buffering area domain 121 and second buffering area domain 221.The application by increase every
The thickness of first extension P2 of film 3 reduces the gap between the first extension P2 and second buffering area domain 221, to enhance
Capillarity improves the wellability of electrolyte, shortens the transmission path of lithium ion, avoids analysis lithium, improves the performance of secondary cell.
Diaphragm 3 can be adjusted by different molding modes.
For example, in one embodiment, referring to Fig. 6, substrate 31 has uniform thickness, it can be by adjusting 32 He of first coating
The thickness of second coating 33 controls the thickness of diaphragm 3.First coating 32 includes Part III 321 and prolongs from Part III 321
The Part IV 322 stretched, and the thickness of Part IV 322 is greater than the thickness of Part III 321.Second coating 33 includes the 6th
Divide 331 and the Part VII 332 from the extension of Part VI 331, and the thickness of Part VII 332 is greater than the thickness of Part VI 331
Degree.Wherein, Part III 321 and Part VI 331 are corresponding in size and position, and Part IV 322 and Part VII 332 exist
It is corresponding in size and position.
The region and Part VI 331 that Part III 321, substrate 31 are covered by Part III 321 form matrix part P1,
The region and Part VII 332 that Part IV 322, substrate 31 are covered by Part IV 322 form the first extension P2.
At this point, Part IV 322 is prominent relative to Part III 321, Part VII 332 is prominent relative to Part VI 331
Out, that is to say, that the first extension P2 is prominent relative to two surfaces of matrix part P1.Due to first buffering area domain 121 and
Two buffer areas 221 are located at the two sides of the first extension P2, therefore, when the first extension P2 relative to matrix part P1 two
When a surface is prominent, the consistency of two side clearance of the first extension P2 can be improved.
Alternatively, of course, in another embodiment, have uniformly referring to Fig. 7, first coating 32 and second coating 33
Thickness can control the thickness of diaphragm 3 by adjusting the thickness of substrate 31.Substrate 31 is including first part 311 and from first
Divide 311 second parts 312 extended, and the thickness of second part 312 is greater than the thickness of first part 311.First part 311 with
And first coating 32 coated on first part 311 and second coating 33 form matrix part P1, second part 312 and are coated on
The first coating 32 and second coating 33 of second part 312 form the first extension P2.
Preferably, second part 312 is prominent relative to two surfaces of first part 311；And due to 32 He of first coating
Second coating 33 has uniform thickness, and therefore, the first extension P2 is prominent relative to two surfaces of matrix part P1.
Second embodiment is illustrated below.To simplify the description, second embodiment and first are only mainly introduced below
The difference of embodiment, the part not described are referred to first embodiment and are understood.
Referring to Fig. 8, in a second embodiment, the first protrusion 112 and the second protrusion 212 difference position electrode assembly 4 are along width
The both ends of direction X, that is to say, that the position in the first extension P2 and second buffering area domain 221 does not correspond to.
0 and Figure 11 referring to Fig.1, diaphragm 3 further include the second extension P3, the first extension P2 and the second extension P3 difference
Extend from the both ends of matrix part P1, and the thickness of the second extension P3 is greater than the thickness of matrix part P1；Second extension P3 and
The second buffering area domain 221 of two active material layers 22 is opposite.The application passes through the thickness for increasing the second extension P3 of diaphragm 3,
Reduce the gap between the second extension P3 and second buffering area domain 221, to enhance capillarity, improves the infiltration of electrolyte
Property, shorten the transmission path of lithium ion, avoid analysis lithium, improves the performance of secondary cell.
Diaphragm 3 can be adjusted by different molding modes.
For example, in one embodiment, referring to Fig.1 1, substrate 31 has uniform thickness, can be by adjusting first coating 32
The thickness of diaphragm 3 is controlled with the thickness of second coating 33.First coating 32 includes Part III 321 and from Part III 321
The Part IV 322 of extension, and the thickness of Part IV 322 is greater than the thickness of Part III 321.Second coating 33 includes the 6th
Part 331 and the Part VII 332 extended from Part VI 331, and the thickness of Part VII 332 is greater than Part VI 331
Thickness.Wherein, Part IV 322 and Part VII 332 both ends that be located at X in the width direction opposite.
Region that Part IV 322, substrate 31 are covered by Part IV 322 and Part VI 331 and Part IV
322 corresponding regions form the first extension P2, region that Part VII 332, substrate 31 are covered by Part VII 332 and the
The region corresponding with Part VII 332 of three parts 321 forms the second extension P3, the first extension P2 and the second extension P3
Between part be matrix part P1.
Since the first extension P2 is only opposite with first buffering area domain 121, the first extension P2 only need to be relative to base
The surface opposite with the first active material layer 12 of body portion P1 is prominent.Similarly, the second extension P3 is relative to matrix part
The surface opposite with the second active material layer 22 of P1 is prominent.
In another embodiment, referring to Fig.1 2, first coating 32 and second coating 33 have uniform thickness, can pass through tune
The thickness of integral basis material 31 controls the thickness of diaphragm 3.Substrate 31 includes first part 311, second part 312 and Part V
313, second part 312 and Part V 313 extend from the both ends of first part 311 respectively, and the thickness of second part 312 and
The thickness of Part V 313 is all larger than the thickness of first part 311.
First part 311 and first coating 32 coated on first part 311 and second coating 33 form matrix part P1,
Second part 312 and first coating 32 coated on second part 312 and second coating 33 form the first extension P2, and the 5th
Part 313 and first coating 32 coated on Part V 313 and second coating 33 form the second extension P3.
Preferably, second part 312 is prominent relative to the surface opposite with the first active material layer 12 of first part 311
Out, Part V 313 is prominent relative to the surface opposite with the second active material layer 22 of first part 311.
Claims (10)
1. a kind of electrode assembly, including the first pole piece (1), the second pole piece (2) and diaphragm (3), diaphragm (3) are set to the first pole piece
(1) between the second pole piece (2)；
First pole piece (1) includes the first collector (11) and the first active material layer for being set to the first collector (11) surface
(12), the first collector (11) includes the first main part (111) and uncoated first coated with the first active material layer (12)
The first protrusion (112) of active material layer (12)；
Second pole piece (2) includes the second collector (21) and the second active material layer for being set to the second collector (21) surface
(22), the second collector (21) includes the second main part (211) and uncoated second coated with the second active material layer (22)
The second protrusion (212) of active material layer (22)；
First active material layer (12) is equipped with first buffering area domain (121) in the end close to the first protrusion (112), and first is slow
Rush the thickness of the thickness in region (121) less than other regions of the first active material layer (12)；
Diaphragm (3) includes matrix part (P1) and the first extension (P2), matrix part (P1) be located at the first active material layer (12) and
Between second active material layer (22), the first extension (P2) extends from one end of matrix part (P1), and the first extension (P2)
Thickness be greater than matrix part (P1) thickness；
The first buffering area domain (121) of first extension (P2) and the first active material layer (12) is opposite.
2. electrode assembly according to claim 1, which is characterized in that
Along the direction close to the first protrusion (112), the thickness of first buffering area domain (121) is gradually reduced；
Along the direction far from matrix part (P1), the thickness of the first extension (P2) is gradually increased.
3. electrode assembly according to claim 1, which is characterized in that diaphragm (3) includes substrate (31) and is respectively arranged at
The first coating (32) and second coating (33) on (31) two surfaces of substrate.
4. electrode assembly according to claim 3, which is characterized in that
Substrate (31) includes first part (311) and the second part (312) that extends from first part (311), and second part
(312) thickness is greater than the thickness of first part (311)；
First part (311) and the first coating (32) and second coating (33) formation matrix for being coated on first part (311)
Portion (P1), second part (312) and the first coating (32) and second coating (33) formation for being coated on second part (312)
One extension (P2).
5. electrode assembly according to claim 3, which is characterized in that
First coating (32) includes Part III (321) and the Part IV (322) that extends from Part III (321), and the 4th
Partially the thickness of (322) is greater than the thickness of Part III (321)；
Region that Part III (321), substrate (31) are covered by Part III (321) and second coating (33) with third portion
(321) corresponding region is divided to form matrix part (P1), the area that Part IV (322), substrate (31) are covered by Part IV (322)
Domain and the region corresponding with Part IV (322) of second coating (33) form the first extension (P2).
6. electrode assembly according to any one of claims 1-5, which is characterized in that
Second active material layer (22) is equipped with second buffering area domain (221) in the end close to the second protrusion (212), and second is slow
Rush the thickness of the thickness in region (221) less than other regions of the second active material layer (22)；
First protrusion (112) and the second protrusion (212) are located at the same end of the electrode assembly；
First extension (P2) is located between first buffering area domain (121) and second buffering area domain (221).
7. electrode assembly according to claim 6, which is characterized in that the first extension (P2) is relative to matrix part (P1)
Two surfaces are prominent.
8. electrode assembly according to any one of claims 1-5, which is characterized in that
Second active material layer (22) is equipped with second buffering area domain (221) in the end close to the second protrusion (212), and second is slow
Rush the thickness of the thickness in region (221) less than other regions of the second active material layer (22)；
Diaphragm (3) further includes the second extension (P3), and the first extension (P2) and the second extension (P3) are respectively from matrix part
(P1) both ends extend, and the thickness of the second extension (P3) is greater than the thickness of matrix part (P1)；
First protrusion (112) and the second protrusion (212) are located at the both ends of the electrode assembly；
The second buffering area domain (221) of second extension (P3) and the second active material layer (22) is opposite.
9. electrode assembly according to claim 8, which is characterized in that the first extension (P2) is relative to matrix part (P1)
The surface opposite with the first active material layer (12) is prominent, and the second extension (P3) is relative to matrix part (P1) and second activity
The opposite surface of material layer (22) is prominent.
10. a kind of secondary cell, including electrode assembly of any of claims 1-9.
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| CN201821778805.9U CN208819984U (en) | 2018-10-31 | 2018-10-31 | Electrode assembly and secondary cell |
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|---|---|---|---|
| CN201821778805.9U CN208819984U (en) | 2018-10-31 | 2018-10-31 | Electrode assembly and secondary cell |
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| CN112310409A (en) * | 2019-08-14 | 2021-02-02 | 宁德时代新能源科技股份有限公司 | Electrode assembly and secondary battery |
| CN112366393A (en) * | 2019-07-23 | 2021-02-12 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN112820851A (en) * | 2020-12-31 | 2021-05-18 | 宁德新能源科技有限公司 | Battery cell, battery and power utilization device |
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