CN209401732U - Electrode assembly and secondary cell - Google Patents
Electrode assembly and secondary cell Download PDFInfo
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- CN209401732U CN209401732U CN201920385298.0U CN201920385298U CN209401732U CN 209401732 U CN209401732 U CN 209401732U CN 201920385298 U CN201920385298 U CN 201920385298U CN 209401732 U CN209401732 U CN 209401732U
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- collector
- pole piece
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- electrode assembly
- diaphragm
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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
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 separates the first pole piece and the second pole piece.First pole piece includes the first collector, the first active material layer and the first tab, and the first active material layer is set to the surface of the first collector, and the first tab extends from the edge of the first collector in the width direction.Second pole piece includes the second collector, the second active material layer and the second tab, and the second active material layer is set to the surface of the second collector, and the second tab extends from the edge of the second collector in the width direction.The electrode assembly further includes the first protective layer, and the first protective layer is set to the surface of close first pole piece of diaphragm and is located at the end of diaphragm in the width direction.Along the first pole piece, the stacking direction of the second pole piece and diaphragm, the edge for being connected to the first tab of the first collector is Chong Die with the first protective 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
Electrode assembly is the core component that secondary cell realizes charging/discharging function.Electrode assembly generally include anode pole piece,
Cathode pole piece and the diaphragm for separating anode pole piece.In the production process of pole piece, it usually needs cut, and cut out to pole piece
The part cut is easy to produce burr, and burr is easy to puncture diaphragm, causes short-circuit risks.
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 reduce the risk that diaphragm is punctured, and avoid short circuit, improve security performance.
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 separates the first pole piece and the second pole piece.First
Pole piece includes the first collector, the first active material layer and the first tab, and the first active material layer is set to the first collector
Surface, the first tab extend from the edge of the first collector in the width direction.Second pole piece includes the second collector, the second activity
Material layer and the second tab, the second active material layer are set to the surface of the second collector, and the second tab is from the second collector edge
The edge of width direction extends.The electrode assembly further includes the first protective layer, the first protective layer be set to diaphragm close to the
The surface of one pole piece and be located at the end of diaphragm in the width direction.Along the first pole piece, the stacking direction of the second pole piece and diaphragm,
The edge for being connected to the first tab of one collector is Chong Die with the first protective layer.
Along the stacking direction, the edge for being connected to the second tab of the second collector is also Chong Die with the first protective layer.
The electrode assembly also further includes the second protective layer, and the second protective layer is set to the table close to the second pole piece of diaphragm
Face and the end for being located at diaphragm.Along the stacking direction, the edge for being connected to the second tab of the second collector and the second protection
Layer overlapping.
In the width direction, the edge of the first active material layer exceeds the edge of the second active material layer.
In the width direction, the edge for being connected to the second tab of the second collector exceeds the edge of the second active material layer.
In the width direction, the second protective layer is located at the outside of the second active material layer.
First protective layer with a thickness of 10 μm -50 μm.
In the width direction, the size of the first protective layer is 0.1mm-1.5mm.
First pole piece, the second pole piece and membrane winding are integrated.
Secondary cell includes the electrode assembly.
The beneficial effects of the utility model are as follows: in this application, the first protective layer can be by the edge of the first collector
On burr separated with diaphragm, reduce the risk that is punctured of diaphragm, avoid short circuit, improve security performance.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the electrode assembly of the utility model.
Fig. 2 is the cross-sectional view that A-A makes along Fig. 1.
Fig. 3 is the cross-sectional view for the embodiment that B-B makes along Fig. 1.
Fig. 4 is the enlarged drawing of Fig. 3 dotted box portion.
Schematic diagram of first pole piece in unfolded state that Fig. 5 is Fig. 3.
Schematic diagram of second pole piece in unfolded state that Fig. 6 is Fig. 3.
Fig. 7 is the cross-sectional view for another embodiment that B-B makes along Fig. 1.
Fig. 8 is the enlarged drawing of Fig. 7 dotted box portion.
Schematic diagram of first pole piece in unfolded state that Fig. 9 is Fig. 7.
Schematic diagram of second pole piece in unfolded state that Figure 10 is Fig. 7.
Figure 11 is the schematic diagram according to the secondary cell of the utility model.
Wherein, the reference numerals are as follows:
1 first pole piece
11 first collectors
12 first active material layers
13 first tabs
2 second pole pieces
21 second collectors
22 second active material layers
23 second tabs
3 diaphragms
4 first protective layers
5 second protective layers
6 shells
7 lamina tectis
8 electrode terminals
9 switching pieces
X stacking direction
Y width direction
Z length direction
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, and
It is not used in restriction the application.
In the description of the present application unless specifically defined or limited otherwise, term " first ", " second " are only used for describing
Purpose, be not understood to indicate or imply relative importance；Term " multiple " refers to more than two (including two)；Unless
It stating otherwise or illustrates, term " connection ", " fixation " etc. shall be understood in a broad sense, for example, " connection " may be a fixed connection,
It can be and be detachably connected, or be integrally connected, or electrical connection or signal connection；" connection " can be directly connected, can also be with
Indirectly connected through an intermediary.For the ordinary skill in the art, above-mentioned art can be understood as the case may be
The concrete meaning of language in this application.
In the description of this specification, it is to be understood that the nouns of locality such as "upper", "lower" described in the embodiment of the present application are
With angle shown in the drawings come what is be described, the restriction to the embodiment of the present application should not be construed as.Below by specific reality
It applies example and the application is described in further detail in conjunction with attached drawing.
The secondary cell of the application includes electrode assembly, and electrode assembly is the core that secondary cell realizes charging/discharging function
Part.
Secondary cell can be soft-package battery, and electrode assembly is directly encapsulated into packaging bag, and the packaging bag can be aluminum plastic film.
Certainly, the secondary cell of the application can also be hard shell battery.Specifically, referring to Fig.1 1, secondary cell includes also wrapping
Include shell 6, lamina tecti 7, electrode terminal 8 and switching piece 9.Shell 6 can have hexahedral shape or other shapes.Inside shell 6
Accommodating chamber is formed, with accommodate electrod component and electrolyte.Shell 6 forms opening at one end, and electrode assembly can be opened via described
Mouth is placed into the accommodating chamber of shell 6.Shell 6 can be made of the material of the conductive metals such as aluminum or aluminum alloy, can also be exhausted by plastic cement etc.
Edge material is made.Lamina tecti 7 is set to shell 6 and covers the opening of shell 6, so that electrode assembly is enclosed in shell 6.Electricity
Extreme son 8 is set to lamina tecti 3, and the upper end of electrode terminal 8 is projected into 7 upside of lamina tecti, and lower end may pass through lamina tecti 7 and extend
Into shell 6.Switching piece 9 is set in shell 6 and is fixed on electrode terminal 8.Electrode terminal 8 and switching piece 9 are two.
In the first embodiment, referring to Fig. 2, electrode assembly includes the first pole piece 1, the second pole piece 2 and diaphragm 3, and diaphragm 3 will
First pole piece 1 and the second pole piece 2 separate.The electrode assembly of the application can be takeup type structure, wherein the first pole piece 1, the second pole
Piece 2 and the winding of diaphragm 3 are integrated, and press to form flat structure by pressure.
Referring to Fig. 3, the first pole piece 1 includes the first collector 11, the first active material layer 12 and the first tab 13, and first is living
Two surfaces to the first collector 11 can be arranged in property material layer 12 by way of coating.Referring to Fig. 4, in the present embodiment,
Along the width direction Y of electrode assembly, two edges 111 of the first collector 11 respectively with two sides of the first active material layer 12
Edge 121 flushes.Referring to Fig. 5, the first tab 13 can be from an edge 111 of the first collector 111 towards far from the first active material
The direction of layer 12 extends.Width direction Y is in substantially parallel relationship to the wireline reel of electrode assembly.First tab 13 can be via a switching piece
9 are electrically connected with an electrode terminal 8.
First collector 11 and the first tab 13 can be integrally formed by metal foil.First pole piece 1 needs in forming process
When cutting, and cutting, burr will form on an edge 111 for being connected to the first tab 13 for the first collector 11.
Referring to Fig. 3, the second pole piece 2 includes the second collector 21, the second active material layer 22 and the second tab 23, and second is living
Two surfaces to the second collector 21 can be arranged in property material layer 22 by way of coating.Referring to Fig. 4, along the width of electrode assembly
Direction Y is spent, two edges 211 of the second collector 21 are flushed with two edges 221 of the second active material layer 22 respectively.Reference
Fig. 6, the second tab 23 can extend from an edge 211 of the second collector 21 towards the direction far from the second active material layer 22.
Second tab 23 can be electrically connected via another switching piece 9 with another electrode terminal 8.
Second collector 21 and the second tab 23 can be integrally formed by metal foil.Second pole piece 2 needs in forming process
When cutting, and cutting, burr will form on an edge 211 for being connected to the second tab 23 for the second collector 21.
Referring to Fig. 4, the electrode assembly further includes the first protective layer 4, the first protective layer 4 be set to diaphragm 3 close to the
The surface of one pole piece 1.First protective layer 4 can be for insulating cement and coated on the surface of diaphragm 3.First protective layer 4 is located at 3 edge of diaphragm
The end of width direction Y, in other words, the first protective layer 4 close to diaphragm 3 in the width direction Y an edge 31 be arranged.First
The rigidity of protective layer 4 is greater than the rigidity of diaphragm 3.
Along the stacking direction X of the first pole piece 1, the second pole piece 2 and diaphragm 3, the first collector 11 is connected to the first tab
13 edge 111 is Chong Die with the first protective layer 4.In other words, the edge 111 for being connected to the first tab 13 of the first collector 11
The projection of X is located in the first protective layer 4 in the stacking direction.Stacking direction X is in substantially parallel relationship to the thickness direction of diaphragm 3.
In this application, the first protective layer 4 can separate the burr on the edge 111 of the first collector 11 with diaphragm 3,
The risk that diaphragm 3 is punctured is reduced, short circuit is avoided, improves security performance.
Preferably, along the stacking direction X, the edge 211 for being connected to the second tab 23 of the second collector 21 is also with
The overlapping of one protective layer 4.In other words, the throwing of the edge 211 for being connected to the second tab 23 of the second collector 21 X in the stacking direction
Shadow also is located in the first protective layer 4.At this point, even if the burr at the edge 211 of the second collector 21 punctures diaphragm 3, the first protection
Layer 4 can also separate the edge 211 of the second collector 21 and the first pole piece 1, to reduce short-circuit risks, improve safety
Energy.
Further, the electrode assembly also further includes the second protective layer 5, and the second protective layer 5 is set to the close of diaphragm 3
The surface of second pole piece 2.Second protective layer 5 can be for insulating cement and coated on the surface of diaphragm 3.Second protective layer 5 is located at diaphragm 3
End, in other words, the second protective layer 5 close to diaphragm 3 in the width direction Y an edge 31 be arranged.X in the stacking direction,
First protective layer 4 is Chong Die with the second protective layer 5.The rigidity of second protective layer 5 is greater than the rigidity of diaphragm 3.
Along the stacking direction X, the edge 211 for being connected to the second tab 23 and the second protective layer 5 of the second collector 21
Overlapping.That is, the projection of the edge 211 for being connected to the second tab 23 of the second collector 21 X in the stacking direction is located at the
In two protective layers 5.Second protective layer 5 can be punctured to avoid diaphragm 3 by the edge 211 of the second collector 21, to provide bilayer
Protection, further increases security performance.
In this application, the first pole piece 1 can be cathode pole piece, and specifically, the first collector 11 is copper foil, the first active matter
Matter layer 12 includes graphite or silicon isoreactivity material.Accordingly, the second pole piece 2 is anode pole piece 2, and the first collector 21 is aluminium foil,
Second active material layer 22 includes LiMn2O4 or LiFePO4.In the course of work of electrode assembly, the second active material layer 22
In lithium ion need across diaphragm 3 and be embedded into the first active material layer 12, if the first active material layer 12 is along width side
Size to Y is less than normal, then lithium ion can not be completely embedded into the first active material layer 12, so as to cause analysis lithium.Therefore, in order to
Guarantee that lithium ion can be embedded into the first active material layer 12 as far as possible, it is preferable that the first active material layer 12 is along width side
It is greater than the size of the second active material layer 22 Y in the width direction to the size of Y.
Further, referring to Fig. 3 and Fig. 4, in one end of electrode assembly Y in the width direction, the first active material layer 12
One edge 121 exceeds an edge 221 of the second active material layer 22.In the other end of electrode assembly Y in the width direction,
Another edge 121 of one active material layer 12 exceeds another edge 221 of the second active material layer 22.
Preferably, the first protective layer 4 with a thickness of 10 μm -50 μm.If the thickness of the first protective layer 4 less than 10 μm, that
, there is the risk punctured by burr in the low strength of the first protective layer 4.If the thickness of the first protective layer 4 is greater than 50 μm, the
One protective layer, 4 the space occupied is larger, reduces the energy density of electrode assembly.Similarly, the thickness of the second protective layer 5 can also be
10μm-50μm。
Preferably, Y, the size of the first protective layer 4 are 0.1mm-1.5mm in the width direction.In winding, the first collector
11 edge 111 is easy to appear dislocation；If the size of the first protective layer 4 is less than 0.1mm, when the side of the first collector 11
When edge 111 misplaces, the first protective layer 4 is difficult to the edge 111 of the first collector 11 and diaphragm 3 is completely separated, initiation safety wind
Danger.If the size of the first protective layer 4 is greater than 1.5mm, the first protective layer 4 can occupy biggish space, increase electrode group
The weight of part, to being affected for the energy density of electrode assembly.
The second embodiment of the secondary cell of the application is illustrated below.To simplify the description, only main below to be situated between
The difference of the second embodiment that continues and first embodiment, the part not described are referred to first embodiment and are understood.
Referring to Fig. 7 to Figure 10, in a second embodiment, Y, the second collector 21 are connected to the second tab in the width direction
23 edge 211 exceeds the edge 221 of the second active material layer 22.That is, the ruler of the second collector 21 Y in the width direction
The very little size for being greater than the second active material layer 22 Y in the width direction.
Referring to Fig. 4, in the first embodiment, in order to guarantee that lithium ion can be embedded into the first active material layer as far as possible
12, the edge 121 of the first active material layer 12 exceeds the edge 221 of the second active material layer 22；Accordingly, the first collector 11
Edge 111 also above the second collector 21 edge 211.At this point, on width direction Y, the edge 111 of the first collector 11
There is biggish spacing with the edge 211 of the second collector 21；And in order to simultaneously by the edge 111 and second of the first collector 11
The edge 211 of collector 21 is separated with diaphragm 3, and the first protective layer 4 and the second protective layer 5 need to have biggish size.
And in a second embodiment, by increasing the size of the second collector 21, it can reduce the side of the first collector 11
Spacing of the edge 211 of edge 111 and the second collector 21 on width direction Y protects the first protective layer 4 and second to reduce
Material is saved in the requirement of sheath 5 dimensionally, improves energy density.
Preferably, Y, the second protective layer 5 are located at the outside of the second active material layer 22 in the width direction.That is,
On stacking direction X, the second protective layer 5 is not Chong Die with the second active material layer 22.At this point, the second protective layer 5 can make full use of
The space in 22 outside of the second active material layer, avoids being superimposed on thickness with the second active material layer 22, to reduce electrode group
The volume of part improves energy density.
Claims (10)
1. a kind of electrode assembly, which is characterized in that including the first pole piece (1), the second pole piece (2) and diaphragm (3), diaphragm (3) will
First pole piece (1) and the second pole piece (2) separate；
First pole piece (1) includes the first collector (11), the first active material layer (12) and the first tab (13), the first active matter
Matter layer (12) is set to the surface of the first collector (11), the first tab (13) from the first collector (11) in the width direction (Y)
Edge (111) extend；
Second pole piece (2) includes the second collector (21), the second active material layer (22) and the second tab (23), the second active matter
Matter layer (22) is set to the surface of the second collector (21), the second tab (23) from the second collector (21) in the width direction (Y)
Edge (211) extend；
The electrode assembly further includes the first protective layer (4), and the first protective layer (4) is set to close first pole piece of diaphragm (3)
(1) surface and the end for being located at diaphragm (3) (Y) in the width direction；
Along the stacking direction (X) of the first pole piece (1), the second pole piece (2) and diaphragm (3), the first collector (11) is connected to
The edge (111) of one tab (13) is Chong Die with the first protective layer (4).
2. electrode assembly according to claim 1, which is characterized in that along the stacking direction (X), the second collector (21)
The edge (211) for being connected to the second tab (23) it is also Chong Die with the first protective layer (4).
3. electrode assembly according to claim 1 or 2, which is characterized in that
The electrode assembly also further includes the second protective layer (5), and the second protective layer (5) is set to close second pole of diaphragm (3)
The surface of piece (2) and the end for being located at diaphragm (3)；
Along the stacking direction (X), the edge (211) for being connected to the second tab (23) of the second collector (21) and the second protection
Layer (5) overlapping.
4. electrode assembly according to claim 3, which is characterized in that (Y) in the width direction, the first active material layer (12)
Edge (121) exceed the second active material layer (22) edge (221).
5. electrode assembly according to claim 4, which is characterized in that (Y) in the width direction, the company of the second collector (21)
The edge (211) for being connected to the second tab (23) exceeds the edge (221) of the second active material layer (22).
6. electrode assembly according to claim 5, which is characterized in that (Y) in the width direction, the second protective layer (5) are located at
The outside of second active material layer (22).
7. electrode assembly according to claim 1, which is characterized in that the first protective layer (4) with a thickness of 10 μm -50 μm.
8. electrode assembly according to claim 1, which is characterized in that (Y) in the width direction, the ruler of the first protective layer (4)
Very little is 0.1mm-1.5mm.
9. electrode assembly according to claim 1, which is characterized in that the first pole piece (1), the second pole piece (2) and diaphragm (3)
Winding is integrated.
10. a kind of secondary cell, which is characterized in that including electrode assembly of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920385298.0U CN209401732U (en) | 2019-03-25 | 2019-03-25 | Electrode assembly and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920385298.0U CN209401732U (en) | 2019-03-25 | 2019-03-25 | Electrode assembly and secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209401732U true CN209401732U (en) | 2019-09-17 |
Family
ID=67899950
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920385298.0U Active CN209401732U (en) | 2019-03-25 | 2019-03-25 | Electrode assembly and secondary cell |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310574A (en) * | 2020-09-30 | 2021-02-02 | 宁德时代新能源科技股份有限公司 | Cylindrical battery cell, battery, electric device, manufacturing method and manufacturing system |
| 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 |
| CN114447442A (en) * | 2022-02-07 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Battery core and battery |
| CN115064843A (en) * | 2022-07-20 | 2022-09-16 | 宁德新能源科技有限公司 | Battery and power consumption device thereof |
| CN115552657A (en) * | 2021-08-10 | 2022-12-30 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
-
2019
- 2019-03-25 CN CN201920385298.0U patent/CN209401732U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310574A (en) * | 2020-09-30 | 2021-02-02 | 宁德时代新能源科技股份有限公司 | Cylindrical battery cell, battery, electric device, manufacturing method and manufacturing system |
| WO2022068449A1 (en) * | 2020-09-30 | 2022-04-07 | 宁德时代新能源科技股份有限公司 | Cylindrical battery cell, battery, electric device, manufacturing method, and manufacturing system |
| 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 |
| CN112820851B (en) * | 2020-12-31 | 2022-07-08 | 宁德新能源科技有限公司 | Battery cell, battery and power utilization device |
| CN115552657A (en) * | 2021-08-10 | 2022-12-30 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114447442A (en) * | 2022-02-07 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Battery core and battery |
| CN115064843A (en) * | 2022-07-20 | 2022-09-16 | 宁德新能源科技有限公司 | Battery and power consumption device thereof |
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