CN208820001U - Secondary cell - Google Patents
Secondary cell Download PDFInfo
- Publication number
- CN208820001U CN208820001U CN201821528113.9U CN201821528113U CN208820001U CN 208820001 U CN208820001 U CN 208820001U CN 201821528113 U CN201821528113 U CN 201821528113U CN 208820001 U CN208820001 U CN 208820001U
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- Prior art keywords
- protrusion
- electrode
- secondary cell
- diaphragm
- lamina tecti
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- 238000002347 injection Methods 0.000 claims abstract description 48
- 239000007924 injection Substances 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000011149 active material Substances 0.000 claims description 29
- 238000003466 welding Methods 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 46
- 239000003792 electrolyte Substances 0.000 description 39
- 238000010586 diagram Methods 0.000 description 13
- 230000005611 electricity Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000003116 impacting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a kind of secondary cell comprising electrode assembly, shell and cap assembly.Electrode assembly includes first electrode component, second electrode component and diaphragm, and diaphragm is set between first electrode component and second electrode component.Shell has opening and receiving electrode assembly.Cap assembly includes lamina tecti and the first electrode terminal for being set to lamina tecti, and lamina tecti covers the opening of shell；Lamina tecti has liquid injection hole.First electrode component includes main part, the first protrusion and the second protrusion, and the first protrusion is connected to one end of the close lamina tecti of main part, and the second protrusion connects the first protrusion and first electrode terminal.In the direction of the width, the first protrusion extends to the downside of liquid injection hole, and the first protrusion exceeds the second protrusion close to the first end of liquid injection hole.
Description
Technical field
The utility model relates to field of batteries more particularly to a kind of secondary cells.
Background technique
Secondary cell includes electrode assembly, cap assembly and shell, and shell accommodates electrode assembly, the lamina tecti of cap assembly
It is fixed on shell and electrode assembly is enclosed in shell.Electrode assembly include first electrode component, second electrode component and
The diaphragm that first electrode component and second electrode component are separated.In fluid injection, electrolyte can impact diaphragm, if liquid filling pressure
Larger, diaphragm is easy to appear fold, and the end of the end and second electrode component that lead to first electrode component is exposed, and causes short circuit
Risk.
Utility model content
In view of the problems in the background art, the purpose of this utility model is to provide a kind of secondary cells, can subtract
The probability that micromesentery is turned down in fluid injection reduces short-circuit risks.
To achieve the goals above, the utility model provides a kind of secondary cell comprising electrode assembly, shell and
Cap assembly.Electrode assembly includes first electrode component, second electrode component and diaphragm, and diaphragm is set to first electrode component
Between second electrode component.Shell has opening and receiving electrode assembly.Cap assembly includes lamina tecti and is set to top cover
The first electrode terminal of plate, lamina tecti cover the opening of shell；Lamina tecti has liquid injection hole.First electrode component includes main body
Portion, the first protrusion and the second protrusion, the first protrusion are connected to one end of the close lamina tecti of main part, the second protrusion connection first
Protrusion and first electrode terminal.In the direction of the width, the first protrusion extends to the downside of liquid injection hole, and the first protrusion is close to fluid injection
The first end in hole exceeds the second protrusion.
In the width direction, the first protrusion exceeds the second protrusion far from the second end of liquid injection hole.First end exceeds second
The length of protrusion is L1, and length of the second end beyond the second protrusion is L2, and L1 is greater than L2.
First protrusion extends from one end of main part along the direction close to lamina tecti, and the first protrusion far from main part the
Three ends are opposite with lamina tecti and are connected to the second protrusion.
The third end of first protrusion is without departing from diaphragm, and the rigidity of the first protrusion is greater than the rigidity of diaphragm.
Second protrusion includes the first bonding pad and the second bonding pad, and the first bonding pad is connected to first electrode terminal and extension
To the downside of liquid injection hole, the second bonding pad bends relative to the first bonding pad and connects the first protrusion and the first bonding pad.
First electrode component includes collector, active material layer and conductive structure, and collector is for stepped construction and including exhausted
Edge matrix and the conductive layer for being set to insulating body surface.Conductive layer include first part and be extended from first part the
Two parts, first part are covered far from the surface of insulating body by active material layer, surface of the second part far from insulating body
It is not covered by active material layer.Conductive structure is welded in second part and forms the first welding area, and conductive structure is towards far from the
The direction of a part extends.The region of active material layer, first part and insulating body covered by first part forms master
Body portion, second part, the region of insulating body covered by second part and the area Chong Die with second part of conductive structure
Domain forms the first protrusion, and the region beyond second part of conductive structure forms the second protrusion.
The surface of first welding area has multiple recess portions.The distribution density of recess portion is 0.4-0.9/mm, and the depth of recess portion
Degree is 8 μm -16 μm.
There are gaps between first welding area and first part, and insulating layer is equipped in the gap.
Conductive layer further includes Part III, and Part III is connected with one end of the separate first part of second part, and the
Surface of the three parts far from insulating body is not covered by active material layer.In the width direction, the width of Part III is less than second
Partial width.Conductive structure is welded in Part III and forms the second welding area, and the second welding area is connected with the first welding area.
The beneficial effects of the utility model are as follows: in the secondary cell of the application, liquid injection hole is opposite with the first protrusion；?
When fluid injection, electrolyte can impact the first protrusion and diaphragm, and the first protrusion and diaphragm are able to bear at the same time the impact force of electrolyte, subtract
The probability of micromesentery fold, reduces short-circuit risks；Meanwhile two adjacent the first protrusions can limit diaphragm between the two,
Increase resistance of the diaphragm to contract, reduce the shrinkage degree of diaphragm, active material layer is avoided to expose, reduces short-circuit risks.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the secondary cell of the utility model.
Fig. 2 is the enlarged drawing of the dotted box portion of Fig. 1.
Fig. 3 is the cross-section diagram according to the electrode assembly of the utility model.
Fig. 4 is the schematic diagram according to an embodiment of the first electrode component of the utility model.
Fig. 5 is the cross-sectional view that A-A makes along Fig. 4.
Schematic diagram after the first electrode component winding that Fig. 6 is Fig. 4.
Fig. 7 is according to first protrusion of the utility model and the schematic diagram of the second protrusion.
Fig. 8 is the schematic diagram according to first protrusion and the second protrusion of the utility model before fluid injection.
Fig. 9 is the schematic diagram according to first protrusion and the second protrusion of the utility model in injection process.
Figure 10 is the schematic diagram according to another embodiment of the first electrode component of the utility model.
Figure 11 is the enlarged drawing of the dotted box portion of Figure 10.
Figure 12 is the cross-sectional view that B-B makes along Figure 11.
Schematic diagram after the first electrode component winding that Figure 13 is Figure 10.
Figure 14 is the collector of the first electrode component of Figure 10 and the schematic diagram of active material layer.
Wherein, the reference numerals are as follows:
1 electrode assembly, 33 second electrode terminal
11 first electrode component, 4 switching piece
111 collector, 5 explosion-proof valve
1111 insulating body, 6 electrolyte
1112 conductive layer P1 main parts
11121 the first protrusions of first part P2
11122 second part P21 first ends
11123 Part III P22 the second ends
112 active material layer P23 third ends
113 the second protrusions of conductive structure P3
114 the first bonding pads insulating layer P31
12 the second bonding pads second electrode component P32
13 diaphragm C recess portions
2 the first welding areas shell W1
3 the second welding areas cap assembly W2
31 lamina tecti X width directions
311 liquid injection hole Y thickness directions
32 first electrode terminal Z height directions
Specific embodiment
It is described in detail the secondary cell of utility model with reference to the accompanying drawings.
Referring to figs. 1 to Fig. 3, the secondary cell of the utility model includes electrode assembly 1, shell 2 and cap assembly 3.
Referring to Fig. 3, electrode assembly 1 includes first electrode component 11, second electrode component 12 and diaphragm 13, and diaphragm 13 is set
It is placed between first electrode component 11 and second electrode component 12.Electrode assembly 1 is by first electrode component 11, second electrode component
12 and diaphragm 13 around the wireline reel coil of wire around formation, the winding axis can be parallel to short transverse Z.Diaphragm 13 is along wireline reel
Two ends in line direction are wound as helical form, and each end approximately forms an end face.
Shell 2 can have hexahedral shape or other shapes.Accommodating chamber is formed inside shell 2, with 1 He of accommodate electrod component
Electrolyte.Shell 2 forms opening at one end, and electrode assembly 1 can be placed into the accommodating chamber of shell 2 via described be open.Shell 2
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.
Cap assembly 3 includes lamina tecti 31 and the first electrode terminal 32 and second electrode terminal that are set to lamina tecti 31
33.Lamina tecti 31 is fixed on shell 2 and covers the opening of shell 2, and electrode assembly 1 is enclosed in shell 2.Second electrode end
Son 33 is electrically connected with second electrode component 12.Cap assembly 3 further includes switching piece 4, connects first electrode terminal 32 and the first electricity
Pole component 11.
Lamina tecti 31 is provided with liquid injection hole 311.In the fluid injection process of battery, liquid-injection equipment can be used for by liquid injection hole 311
Electrolyte is injected into shell 2；Fluid injection is completed, in 311 upside welded seal piece of liquid injection hole；Liquid injection hole 311 and 13 edge of diaphragm
The end of winding axis direction is correspondingly arranged.
Fig. 4 is the schematic diagram of the first electrode component 11 of first embodiment after deployment, and Fig. 5 is that A-A makes along Fig. 4
Cross-sectional view.
Referring to Fig. 4 and Fig. 5, first electrode component 11 includes collector 111 and the active material for being set to collection liquid surface
Layer 112.The material of collector 111 and active material layer 112 can be determined according to the polarity of first electrode component 11.Work as first electrode
When component 11 is anode, collector 111 can be aluminium foil, and active material layer 112 may include positive electrode active materials, such as LiMn2O4,
LiFePO4 etc.；When first electrode component 11 is cathode, collector 111 can be copper foil, and active material layer 112 may include cathode
Active material, such as graphite, silicon etc..
The part of active material layer 112 and collector 111 covered by active material layer 112 forms first electrode component
11 main part P1.Collector 111 also has the protrusion not covered by active material layer 112, and the protrusion can be multiple.It is each prominent
Portion is greater than the width of the second protrusion P3 according to the width that the difference of width is divided into the first protrusion P2 and the second protrusion P3, the first protrusion P2
Degree, and the first protrusion P2 connection main part P1 and the second protrusion P3.
Referring to Fig. 6, after first electrode 11 coiling and molding of component, the multiple protrusion through-thickness Y of collector 111
It is corresponding.Referring to Fig. 7, the multiple protrusion of collector 111 is stacked together and is connected to first electrode terminal 32.
Referring to Figures 1 and 2, the first protrusion P2 and the second protrusion P3 is located at the side of the close lamina tecti 31 of main part P1,
That is, the first protrusion P2 and the second protrusion P3 are located at main part P1 along the upside of short transverse Z.In the secondary battery, more
A second protrusion P3 is stacked together and is welded to switching piece 4.First protrusion P2 may be disposed between diaphragm 13.
On width direction X, the first protrusion P2 extends to the downside of liquid injection hole 311；Along short transverse Z, liquid injection hole 311
It projects Chong Die with the projection of the first protrusion P2.
First protrusion P2 exceeds the second protrusion P3 close to the first end P21 of liquid injection hole 311.Referring to Figures 1 and 2, fluid injection
Hole 311 may be disposed between first electrode terminal 32 and second electrode terminal 33, along the direction close to second electrode terminal 33, the
The first end P21 of one protrusion P2 exceeds the second protrusion P3.Alternatively, liquid injection hole 311 may also set up in first electrode terminal
The side of 32 separate second electrode terminal 33, along the direction far from second electrode terminal 33, the first end of the first protrusion P2
P21 exceeds the second protrusion P3.
In the secondary battery, one end of the close lamina tecti 31 of diaphragm 13 is needed beyond main part P1, thus by the first electricity
Pole component 11 is separated with second electrode component 12, is contacted to avoid active material layer 112 with second electrode component 12, is prevented short
Road.Since the rigidity of diaphragm 13 is smaller, if electrolyte directly impacts diaphragm 13, the close lamina tecti 31 of diaphragm 13 in fluid injection
One end can fold inward shrink, cause active material layer 112 close to lamina tecti 31 end expose, the active material layer of exposing
112 are easy to contact with second electrode component 12, cause short-circuit risks.
And in the secondary cell of the application, liquid injection hole 311 is opposite with the first protrusion P2；In fluid injection, electrolyte can be rushed
The first protrusion P2 and diaphragm 13 are hit, the first protrusion P2 and diaphragm 13 are able to bear at the same time the impact force of electrolyte, reduce diaphragm 13
The probability of fold reduces short-circuit risks；Meanwhile two adjacent the first protrusion P2 can limit diaphragm 13 between the two, increase
Macromesenterium 13 reduces the shrinkage degree of diaphragm 13 to the resistance of contract, and active material layer 112 is avoided to expose, and reduces short-circuit wind
Danger.In addition, intensity of the first electrode component 11 at the first protrusion P2 can also be increased by the width for increasing the first protrusion P2
And conveyance capacity.
In order to reduce the space occupied on short transverse Z of electrode assembly 1, energy density is improved, the application dashes forward second
Portion P3 is bent to two parts.It specifically, include the first bonding pad P31 and the second bonding pad P32 referring to Fig. 7, the second protrusion P3, the
One bonding pad P31 is fixed on first electrode terminal 32 by laser welding, and the second bonding pad P32 is relative to the first bonding pad P31
It bends and connects the first protrusion P2 and the first bonding pad P31；Close lamina tecti of the first bonding pad P31 from the second bonding pad P32
31 one end extends, and the extending direction of the first bonding pad P31 and the thickness direction Y of electrode assembly 1 are unanimous on the whole.Second protrusion
P3 be it is multiple, so multiple first bonding pad P31 are stacked together and are welded to switching piece 4, and multiple second bonding pad P32 that
This independence, does not weld together.Similarly, multiple first protrusion P2 are also independent of each other, and adjacent two first prominent
There is gap, electrolyte can flow into inside electrode assembly 1 out of described gap between portion P2.
In order to improve the conveyance capacity of the second protrusion P3, it will usually the size for increasing the second protrusion P3 X in the width direction, because
This, can extend to the downside of liquid injection hole 311 referring to Fig. 2, the first bonding pad P31 of the second protrusion P3.Referring to Fig. 8, the first connection
A part of area P31 is welded in switching piece 4, and the first bonding pad P31 extends to the part at least covering part of 311 downside of liquid injection hole
The liquid injection hole 311 divided.
Referring to Fig. 9, in fluid injection, electrolyte 6 impacts the first bonding pad P31, and the first bonding pad P31 can stop to be electrolysed
Liquid；Under the percussion of electrolyte, the first bonding pad P31 is bent downward far from one end of switching piece 4, and electrolyte is along curved
The first bonding pad P31 flowing of folding；First bonding pad P31 can reduce the flow velocity of electrolyte, change the flow direction of electrolyte, thus
Reduce impact of the electrolyte to diaphragm 13.Certainly, if the first protrusion P2 is close to the first end P21 of liquid injection hole 311 and second
Protrusion P3 is flushed, then electrolyte still can impact diaphragm 13 after changing flow direction.And in this application, the first protrusion P2 is close
The first end P21 of liquid injection hole 311 exceeds the second protrusion P3, so can impact along the electrolyte that the first bonding pad P31 flows
It is able to bear the impact force of electrolyte to the first protrusion P2, the first protrusion P2, reduces the probability that diaphragm 13 turns down, reduces short-circuit wind
Danger.
Referring to Fig. 7, the first bonding pad P31 generally tabular, generally perpendicular to the inflow direction of electrolyte, by electricity
When solving liquid impact, the first bonding pad P31 bears biggish impact force, is easy to appear deformation, meanwhile, electrolyte can only be along first
Bonding pad P31 is spread to surrounding, cannot be introduced into main part P1.Preferably, the first protrusion P2 is leaned on from one end of main part P1 edge
The direction of nearly lamina tecti 31 extends, the angle of the inflow direction of the extending direction and electrolyte of the first protrusion P2 less than 90 degree, and
Third end P23 of the first protrusion P2 far from main part P1 and lamina tecti 31 are opposite.Due to the first protrusion P2 extending direction with
Less than 90 degree, (extending direction of part the first protrusion P2 can be approximately parallel to the stream of electrolyte to the angle of the inflow direction of electrolyte
Enter direction), so the third end P23 of the first protrusion P2 can divide electrolyte, electrolyte is reduced to third end P23's
Impact force reduces the deformation of third end P23；Furthermore electrolyte can between multiple first protrusion P2 flow into main part P1,
The wetting efficiency of main part P1 can be increased.Third end P23 is connected to the second protrusion P3, so impacting third end in electrolyte
When P23, third end P23 is not easy fold inward.
The third end P23 of first protrusion P2 is without departing from diaphragm 13, that is to say, that along close to lamina tecti 31 direction, every
Film 13 exceeds third end P23.Two adjacent the first protrusion P2 are separated by diaphragm 13.In fluid injection, electrolyte can rush first
Hit diaphragm 13, diaphragm 13 may fold inward shrink, so that the third end P23 of the first protrusion P2 be exposed；The exposed
Three end P23 can bear the impact force of electrolyte, so diaphragm 13 will not be further continued for contract, diaphragm 13 can be maintained at adjacent
The first protrusion P2 between, active material layer 112 would not also be exposed, to reduce short-circuit risks.It supplements herein, edge
Close to the direction of lamina tecti 31, the third end P23 of the first protrusion P2 can exceed the second afflux component 12, so even if third end
Portion P23 exposes, and will not contact with the second afflux component 12.
The rigidity of first protrusion P2 is greater than the rigidity of diaphragm 13.The rigidity of diaphragm 13 is less than normal, so can be just electrolysed
Liquid turns down when impacting, and the first protrusion P2 is metal material, has biggish rigidity, is able to bear biggish impact force.Diaphragm
13 parts beyond third end P23 may be folded on the P23 of third end, and since the rigidity of the first protrusion P2 is larger,
So the first protrusion P2 can effectively support diaphragm 13, reduce the contraction of diaphragm 13.
X in the width direction, the first protrusion P2 exceed the second protrusion P3 far from the second end P22 of liquid injection hole 311.Namely
It saying, the second end P22 and first end P21 of the first protrusion P2 exceeds the second protrusion P3 along 1 width direction X of electrode assembly,
The width of the first protrusion P2 can be further increased in this way, improve conveyance capacity.Furthermore when fluid injection, also there is the electrolyte of part
It is flowed along the first bonding pad P31 towards the direction close to the second end P22, and the second end P22 of the first protrusion P2 is beyond the
The part of two protrusion P3 can also effectively stop electrolyte, reduce the probability that diaphragm 13 turns down.
The length of X in the width direction, first end P21 beyond the second protrusion P3 is L1, and the second end P22 is prominent beyond second
The length of portion P3 is L2, and L1 is greater than L2.Referring to Fig. 9, when fluid injection, most electrolyte is because the blocking of other mechanical parts is towards close
The direction of first end P21 is flowed, and first end P21 is relatively close apart from fluid injection 311, and first end P21 exceeds the second protrusion P3
Part need the impact born larger, and only a small amount of electrolyte is flowed towards the direction close to the second end P22, second end
Portion P22 is smaller beyond the impact that the part of the second protrusion P3 needs to bear, and therefore, L1 usually requires to be greater than L2.In addition, referring to figure
2, on width direction X, the second protrusion P3 and the distance between shell 2 are limited, so the value of L2 is less than normal.
First protrusion P2 may also extend into the downside of explosion-proof valve 5.Referring to Fig. 7, the first protrusion P2 is multiple and interval setting,
So the production gas in electrode assembly 1 can be discharged via the gap between the first protrusion P2.When there is short circuit in secondary cell, electricity
The production gas of pole component 1 directly can be discharged and break through explosion-proof valve from the gap between the first protrusion P2, so that discharge produces gas in time, keep away
Exempt from secondary cell explosion.
Figure 10 is the schematic diagram of the first electrode component 11 of second embodiment after deployment, and Figure 11 is Figure 10 dotted box portion
Enlarged drawing, Figure 12 is the cross-sectional view made of B-B along Figure 11, the signal after the first electrode component winding that Figure 13 is Figure 10
Figure, Figure 14 are the collector of the first electrode component of Figure 10 and the schematic diagram of active material layer.
Referring to Fig.1 0 to Figure 12, the first electrode component 11 of the utility model second embodiment includes collector 111, activity
Material layer 112 and conductive structure 113, collector 111 for stepped construction and including insulating body 1111 and are set to insulating body
The conductive layer 1112 on 1111 surfaces.Conductive layer 1112 and conductive structure 113 can be metal foil.
Conductive layer 1112 includes first part 11121 and the second part 11122 being extended from first part 11121,
Surface of the first part 11121 far from insulating body 1111 is covered by active material layer 112, and second part 11122 is far from insulation
The surface of matrix 1111 is not covered by active material layer 112.
Conductive structure 113 is welded in second part 11122 and forms the first welding area W1, and conductive structure 113 is towards separate
The direction of first part 11121 extends.Conductive structure 113 can be by being fixedly welded on switching piece 4.Referring to Fig.1 3, when the first electricity
After 11 coiling and molding of pole component, multiple 113 through-thickness Y of conductive structure are opposite.
The area of active material layer 112, first part 11121 and insulating body 1111 covered by first part 11121
Domain forms main part P1, second part 11122, the region of insulating body 1111 covered by second part 11122 and conduction
The region Chong Die with second part 11122 of structure 113 forms the first protrusion P2, and conductive structure 113 exceeds second part
11122 region forms the second protrusion P3.After first electrode 11 coiling and molding of component, multiple second protrusion P3 through-thickness
Y is stacked, and multiple first protrusion P2 through-thickness Y are stacked.
First protrusion P2 is connected to one end of the close lamina tecti 31 of main part P1, second protrusion P3 the first protrusion of connection P2
With switching piece 4.On width direction X, the first protrusion P2 extends to the downside of liquid injection hole 311, and the first protrusion P2 is close to fluid injection
The first end P21 in hole 311 exceeds the second protrusion P3
And in the secondary cell of the application, liquid injection hole 311 is opposite with the first protrusion P2；In fluid injection, electrolyte can be rushed
It hits on the first protrusion P2, the first protrusion P2 is able to bear the impact force of electrolyte, reduces the probability that diaphragm 13 turns down, and reduces short
Transportation work style danger.First welding area W1 be formed in the first protrusion P2 and have biggish rigidity, so the first protrusion P2 be able to bear compared with
Large impact power is less prone to fold.
Since the collector 111 of first electrode component 11 is provided with insulating body 1111, it is possible to reduce conductive layer
1112 thickness；When foreign matter pierces through first electrode component 11, since 1112 thickness of conductive layer is smaller, conductive layer 1112 exists
The burr that the position pierced through by foreign matter generates is smaller, is difficult to puncture diaphragm 13, to avoid short circuit, improves security performance.
In this application, second part 11122 has biggish width, meanwhile, electric current can be directly via the first welding
Area W1 flows into conductive structure 113, can improve the conveyance capacity of first electrode component 11.
Conductive structure 113 can pass through ultrasonic bonding connection to second part 11122.1 and Figure 12 referring to Fig.1 welds shape
At the first welding area W1 surface have multiple recess portion C.Recess portion C will increase the coefficient of friction on the surface of the first welding area W1,
Slow down the flowing velocity of electrolyte, to reduce electrolyte to the impact force of diaphragm 13.
The distribution density of recess portion C is 0.4-0.9/mm2.Density is too small, conductive structure 113 and second part 11122
Bonding strength is relatively low, while causing the skin-friction force of the first welding area W1 insufficient；Density is excessive, then is easily destroyed conductive structure
113 with second part 11122.
The depth of recess portion C is 8 μm -16 μm.Depth is too small, and conductive structure 113 and the bonding strength of second part 11122 are inclined
It is low；Depth is excessive, and the first welding area W1 may extend to insulating body 1111, causes the damage of insulating body 1111.Meanwhile
The depth of recess portion C also will affect the skin-friction force of the first welding area W1.
There are gaps between first welding area W1 and first part 11121, and insulating layer 114 is equipped in the gap.Absolutely
The hardness of edge layer 114 is greater than the hardness of conductive layer 1112, and such insulating layer 114 can provide support force for second part 11122,
The deformation of second part 11122 is limited, so that conductive layer 1112 be prevented to be broken, improves the conveyance capacity of first electrode component 11.
Insulating layer 114 can also improve the impact resistance of the first protrusion P2, and the first protrusion P2 is avoided to turn down under the impact of electrolyte.
Referring to Fig.1 4, conductive layer 1112 further includes Part III 11123, Part III 11123 and second part 11122
One end far from first part 11121 is connected, and surface of the Part III 11123 far from insulating body 1111 be not by active material
Layer 112 covers.X in the width direction, the width of Part III 11123 are less than the width of second part 11122.Conductive structure 113
It is welded in Part III 11123 and forms the second welding area W2, the second welding area W2 is connected with the first welding area W1.Part III
11123 can increase the bonding strength of conductive layer 1112 Yu conductive structure 113, meanwhile, electric current can be directly from the first welding area W1
The second welding area W2 is flowed into, the conveyance capacity between conductive structure 113 and conductive layer 1112 is improved.
Claims (11)
1. a kind of secondary cell, which is characterized in that including electrode assembly (1), shell (2) and cap assembly (3)；
Electrode assembly (1) includes first electrode component (11), second electrode component (12) and diaphragm (13), diaphragm (13) setting
Between first electrode component (11) and second electrode component (12)；
Shell (2) has opening and receiving electrode assembly (1)；
Cap assembly (3) includes lamina tecti (31) and the first electrode terminal (32) for being set to lamina tecti (31), lamina tecti (31)
Cover the opening of shell (2)；
Lamina tecti (31) has liquid injection hole (311)；
First electrode component (11) includes main part (P1), the first protrusion (P2) and the second protrusion (P3), and the first protrusion (P2) is even
It is connected to one end of the close lamina tecti (31) of main part (P1), the second protrusion (P3) connects the first protrusion (P2) and first electrode end
Sub (32)；
On width direction (X), the first protrusion (P2) extends to the downside of liquid injection hole (311), and the first protrusion (P2) is close to note
The first end (P21) of fluid apertures (311) exceeds the second protrusion (P3).
2. secondary cell according to claim 1, which is characterized in that (X) in the width direction, the first protrusion (P2) is far from note
The second end (P22) of fluid apertures (311) exceeds the second protrusion (P3).
3. secondary cell according to claim 2, which is characterized in that (X) in the width direction, first end (P21) exceed
The length of second protrusion (P3) is L1, and length of the second end (P22) beyond the second protrusion (P3) is L2, and L1 is greater than L2.
4. secondary cell according to claim 1, which is characterized in that the first protrusion (P2) is from one end edge of main part (P1)
Direction close to lamina tecti (31) extends, and third end (P23) and lamina tecti of the first protrusion (P2) far from main part (P1)
(31) opposite and be connected to the second protrusion (P3).
5. secondary cell according to claim 4, which is characterized in that the third end (P23) of the first protrusion (P2) does not surpass
Diaphragm (13) out, and the rigidity of the first protrusion (P2) is greater than the rigidity of diaphragm (13).
6. secondary cell according to claim 1, which is characterized in that the second protrusion (P3) includes the first bonding pad (P31)
First electrode terminal (32) is connected to the second bonding pad (P32), the first bonding pad (P31) and extends to liquid injection hole (311)
Downside, the second bonding pad (P32) bend relative to the first bonding pad (P31) and connect the first protrusion (P2) and the first bonding pad
(P31)。
7. secondary cell according to claim 1 to 6, which is characterized in that
First electrode component (11) includes collector (111), active material layer (112) and conductive structure (113), collector
(111) for stepped construction and including insulating body (1111) and it is set to the conductive layer (1112) on insulating body (1111) surface；
Conductive layer (1112) includes first part (11121) and the second part extended from first part (11121)
(11122), surface of the first part (11121) far from insulating body (1111) is covered by active material layer (112), second part
(11122) surface far from insulating body (1111) is not covered by active material layer (112)；
Conductive structure (113) is welded in second part (11122) and forms the first welding area (W1), and conductive structure (113) court
Direction far from first part (11121) extends；
Active material layer (112), first part (11121) and insulating body (1111) are covered by first part (11121)
Region formed main part (P1), second part (11122), insulating body (1111) by second part (11122) cover
Region and the region Chong Die with second part (11122) of conductive structure (113) form the first protrusion (P2), conductive structure
(113) the region beyond second part (11122) forms the second protrusion (P3).
8. secondary cell according to claim 7, which is characterized in that the surface of the first welding area (W1) has multiple recess portions
(C)。
9. secondary cell according to claim 8, which is characterized in that the distribution density of recess portion (C) is 0.4-0.9/mm2,
And the depth of recess portion (C) is 8 μm -16 μm.
10. secondary cell according to claim 7, which is characterized in that the first welding area (W1) and first part
(11121) there are gaps between, and are equipped with insulating layer (114) in the gap.
11. secondary cell according to claim 7, which is characterized in that
Conductive layer (1112) further includes Part III (11123), and Part III (11123) is separate with second part (11122)
One end of first part (11121) is connected, and surface of the Part III (11123) far from insulating body (1111) be not by active matter
Matter layer (112) covering；
(X) in the width direction, the width of Part III (11123) are less than the width of second part (11122)；
Conductive structure (113) is welded in Part III (11123) and forms the second welding area (W2), the second welding area (W2) and the
One welding area (W1) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821528113.9U CN208820001U (en) | 2018-09-18 | 2018-09-18 | Secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821528113.9U CN208820001U (en) | 2018-09-18 | 2018-09-18 | Secondary cell |
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| Publication Number | Publication Date |
|---|---|
| CN208820001U true CN208820001U (en) | 2019-05-03 |
Family
ID=66277615
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821528113.9U Active CN208820001U (en) | 2018-09-18 | 2018-09-18 | Secondary cell |
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| Country | Link |
|---|---|
| CN (1) | CN208820001U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911723A (en) * | 2018-09-18 | 2020-03-24 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| US11855304B2 (en) | 2019-08-27 | 2023-12-26 | Contemporary Amperex Technology Co., Limited | Secondary battery |
-
2018
- 2018-09-18 CN CN201821528113.9U patent/CN208820001U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911723A (en) * | 2018-09-18 | 2020-03-24 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| CN110911723B (en) * | 2018-09-18 | 2024-10-18 | 宁德时代新能源科技股份有限公司 | Secondary battery |
| US11855304B2 (en) | 2019-08-27 | 2023-12-26 | Contemporary Amperex Technology Co., Limited | Secondary battery |
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