CN106207070A - Secondary cell - Google Patents
Secondary cell Download PDFInfo
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- CN106207070A CN106207070A CN201510292337.9A CN201510292337A CN106207070A CN 106207070 A CN106207070 A CN 106207070A CN 201510292337 A CN201510292337 A CN 201510292337A CN 106207070 A CN106207070 A CN 106207070A
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- Prior art keywords
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- electrode
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- negative
- secondary cell
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Providing a kind of secondary cell, described secondary cell can prevent electrode tabs from folding in the winding process of battery lead plate or tearing by forming circular portion in electrode tabs.Described secondary cell includes: electrode assemblie, including positive plate, negative plate and the dividing plate being placed between positive plate and negative plate；Electrode tabs, each extension from positive plate and negative plate and be projected into the top of electrode assemblie；Housing, accommodates electrode assemblie；Cover plate, the top of seal casinghousing；And electrode terminal, it is projected into the top of cover plate respectively and is connected to electrode tabs, wherein, each electrode tabs is included at the sidepiece of electrode tabs the circular portion being formed as circular.
Description
This application claims on January 28th, 2015 submit in Korean Intellectual Property Office
The priority of 10-2015-0013523 korean patent application, disclosure of which all comprises by quoting
In this.
Technical field
The present invention relates to a kind of secondary cell.
Background technology
Generally, being different from non-rechargeable one-shot battery, secondary cell can repeatedly charging and discharging.
Production according to technology development and the mobile device of such as mobile phone and notebook increases, right
Demand in the secondary cell as the energy increases the most rapidly.Recently, as Fossil fuel
Fungible energy source, the research to the secondary cell being used in electric vehicle or motor vehicle driven by mixed power is being entered energetically
OK.
Summary of the invention
The invention provides a kind of secondary cell, described secondary cell can be by shape in electrode tabs
Circular part prevents electrode tabs from folding in the winding process of battery lead plate or tearing.
The above and other target of the present invention by description below preferred embodiment is described or according to
Below preferred embodiment, description will be apparent from.
According to an aspect of the present invention, it is provided that a kind of secondary cell, described secondary cell includes: electrode
Assembly, including positive plate, negative plate and the dividing plate being placed between positive plate and negative plate；Electrode tabs,
Each extension from positive plate and negative plate and be projected into the top of electrode assemblie；Housing, accommodates electricity
Pole assembly；Cover plate, the top of seal casinghousing；And electrode terminal, it is projected into the top of cover plate respectively also
Being connected to electrode tabs, wherein, each electrode tabs is included at the sidepiece of electrode tabs and is formed
For circular circular portion.
The top-to-bottom that electrode tabs can have from separating with positive plate and negative plate is gradually increased
Width.
Electrode tabs can include with each first area directly contacted in positive plate and negative plate and
The second area separated with first area while parallel with first area, the length of first area can
With the length more than second area.
Circular portion can make first area and second area be connected to each other.
The radius of circular portion can be 1 to 1.5 times of the length of second area.
The radius of circular portion can be 0.35 to 1 times of the height of electrode tabs.
Can by laser treatment cutting positive plate and negative plate be not coated with positive active material and negative pole
The uncoated part of active substance forms electrode tabs.
As it has been described above, the secondary cell according to the present invention can be by forming rounded portions in electrode tabs
Dividing prevents electrode tabs from bending in the winding process of battery lead plate or tearing.
Accompanying drawing explanation
The preferred embodiments of the present invention are described in detail, the above and other feature of the present invention by referring to accompanying drawing
And advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the perspective view of secondary cell according to an embodiment of the invention；
Fig. 2 is the decomposition diagram of the secondary cell shown in Fig. 1；
Fig. 3 is to illustrate electrode tabs, contact conductor and the electrode in the secondary cell that figure 1 illustrates
The decomposition diagram of the annexation between each in terminal；
Fig. 4 is the perspective view of the electrode assemblie in secondary cell according to an embodiment of the invention；
Fig. 5 is the front view of the battery lead plate in secondary cell according to an embodiment of the invention；
Fig. 6 is the amplification front elevation of the electrode tabs in secondary cell according to an embodiment of the invention；
Fig. 7 illustrates the structure according to the electrode tabs in secondary cell according to an embodiment of the invention
Stress distribution；
Fig. 8 illustrates the electricity of the size with different numerical value in secondary cell according to an embodiment of the invention
The stress distribution of pole lug plate.
Detailed description of the invention
Reference will be made in detail now the embodiment provided of the present invention, the example of the present invention is illustrated in accompanying drawing
In.
Various aspects of the disclosure can be embodied in many different forms, and is not construed as limitation
In the example embodiment illustrated here.On the contrary, it is provided that these example embodiment of the disclosure so that these public affairs
Opening to be thoroughly with complete, and various aspects of the disclosure will be conveyed to those skilled in the art.
In the accompanying drawings, for clarity, the thickness in layer and region is exaggerated.Here, same accompanying drawing
Labelling indicates same element all the time.As it is used herein, term "and/or" includes one or more
Any and all combination of relevant Listed Items.
It addition, the term being used herein is only used for describing the purpose of specific embodiment, it is not intended to become
The restriction of the disclosure.As used herein, unless context shows expressly otherwise, otherwise odd number shape
Formula is intended to also include plural form.It will be further understood that term ought be used in this manual " to comprise "
And/or time " including ", illustrate to there is described feature, quantity, step, operation, element and/or assembly,
But do not preclude the presence or addition of one or more other features, quantity, step, operation, element, group
Part and/or their group.
It will be appreciated that, although term first, second grade here can be used for describing different component, unit
Part, region, layer and/or part, but these components, element, region, layer and/or part should not be subject to
The restriction of these terms.These terms are intended merely to a component, element, region, layer and/or part
Distinguish with another component, element, region, layer and/or part.It is therefoie, for example, without departing from this
In the case of disclosed teaching, the first component discussed below, the first element, first area, ground floor
And/or Part I can be referred to as second component, the second element, second area, the second layer and/or second
Part.
Fig. 1 is the perspective view of secondary cell according to an embodiment of the invention, and Fig. 2 is shown in Fig. 1
The decomposition diagram of secondary cell, Fig. 3 is to illustrate the electrode connection in the secondary cell that figure 1 illustrates
The decomposition diagram of the annexation between each in sheet, contact conductor and electrode terminal.
Referring to figs. 1 through Fig. 3, according to an embodiment of the invention secondary cell 100 include electrode assemblie 110,
Housing 120 and cover plate 140.
Electrode assemblie 110 includes positive plate 111, negative plate 112 and dividing plate 113, and can be with electrolysis
Matter (not shown) is contained in housing 120 together, is then sealed.
For example, it is possible to by the stacked structure of positive plate 111, negative plate 112 and dividing plate 113 is wound
Jellyroll constructions is become this stacked structure to be maybe stacked into the shape of rectangular parallelepiped protrusion part to form electrode assemblie
110.Here, positive plate 111 can be made up of aluminum (Al) paper tinsel, and negative plate 112 can be by copper (Cu)
Paper tinsel is made, and dividing plate 113 can be made up of polyethylene (PE) or polypropylene (PP), but the present invention
Many aspects are not limited to this.Electrolyte can serve as by during charging and discharging at secondary cell 100
Positive plate 111 and negative plate 112 between the move media of lithium ion that produces of electrochemical reaction.Electricity
Solve the non-aqueous organic bath that matter can be the mixture as lithium salts and highly purified organic solvent.It addition,
Electrolyte can be the polymer using polyelectrolyte.
Positive plate 111 can be by just coating at least one surface of plus plate current-collecting body (not shown)
Pole active substance is formed.Similarly, negative plate 112 can be by negative current collector (not shown)
Coat negative electrode active material at least one surface to be formed.Such as, in an embodiment of the present invention, positive pole
Plate 110 can be arranged on the most external of electrode assemblie 110, and this is in order to relatively great amount of by producing
The plus plate current-collecting body (not shown) of heat is arranged into the outside being adjacent to housing 120 and is promoted by housing 120
Enter thermal-radiating purpose.Such as, plus plate current-collecting body (not shown) directly can contact with housing 120 or
Person at least can thermally contact housing 120.Here, statement " thermo-contact " is even if may refer to two elements
May not be in direct contact with one another, allow also to the heat exchange between two elements of thermal contact with one another.
Cathode-chip wiring 114 and cathode wiring plate 115 may be coupled to positive plate 111 and negative plate 112
At least one or more position.Cathode-chip wiring 114 and cathode wiring plate 115 are usually formed as tool
There is the height in the range of 10mm to 30mm.In the entire disclosure of the present invention, positive terminal
Sheet 114 and cathode wiring plate 115 may be collectively termed as electrode tabs 114 and 115.
High power capacity, high output secondary cell in the case of, multiple cathode-chip wirings 114 and multiple negative
Pole lug plate 115 can extend from electrode assemblie 110.More particularly, each cathode-chip wiring 114
By cutting the uncoated part of the positive pole being not coated with positive active material of positive plate 111 and can be formed
Lug plate is formed.It addition, cathode wiring plate 115 can also be by cutting the uncoated of negative plate 112
There is the uncoated part of negative pole of negative electrode active material and form lug plate and formed.Secondary cell can pass through
Multiple cathode-chip wirings 114 and cathode wiring plate 115 obtain high power electric current.Here it is possible to it is individually accurate
Standby each cathode-chip wiring 114 and each cathode wiring plate 115, then attach it to positive plate 111
Uncoated part with negative plate 112.
Meanwhile, electrode tabs 114 and 115 can be formed as including being formed at its side and opposite side
Circular portion 114c and 115c.When forming electrode tabs 114 and 115, it is possible to use at laser
Reason promotes the formation of circular portion 114c and 115c.The radius of circular portion 114c and 115c can be
In the range of 7mm to 30mm.Circular portion 114c and 115c is described in greater detail below.
Cathode-chip wiring 114 may be coupled to cover plate 140 itself, and cathode wiring plate 115 can connect
Receive the negative terminal 145 of the top surface extending to cover plate 140.Such as, positive terminal 144 and negative pole
Terminal 145 can be exposed to the top surface of cover plate 140.Here, cathode-chip wiring 114 may be coupled to
Positive wire 134 is to be then electrically connected to positive terminal 144.It addition, cathode wiring plate 115 can connect
Receive negative wire 135 to be then electrically connected to negative terminal 145.In the entire disclosure of the present invention,
Positive wire 134 and negative wire 135 may be collectively termed as contact conductor 134 and 135.
Before electrode tabs 114 and 115 is connected to contact conductor 134 and 135, multiple electrodes connect
Line sheet 114 and 115 can pass through spot welding (tack welding) and be concentrated into single bundle (Dan Shu).Pass through spot welding
The electrode tabs 114 and 115 being concentrated into single bundle can be easily connected to contact conductor 134 He
135。
Electrode assemblie 110 and electrolyte (not shown) are contained in housing 120.Housing 120 has top
End opening also can be formed by deep draw.The top end opening of housing 120 can be sealed by cover plate 140.
Here, the contact portion of cover plate 140 and housing 120 can be bonded to each other by laser welding.Housing 120
Can be made up of the one selecting from steel, aluminum and equivalent thereof, but the many aspects of the present invention are not limited to
This.
Positive wire 134 electrically connects cathode-chip wiring 114, cover plate 140 and positive terminal 144.Positive pole draws
Line 134 may be constructed such that and bends with generally " L " shape.More particularly, positive wire 134 can
To extend in two different directions to bend subsequently.The Part I 134a of positive wire 134 is permissible
It is set in the face of the basal surface of cover plate 140 is to be subsequently incorporated into cover plate 140.It addition, with Part I
Sides different for 134a upwardly extending Part II 134b could be arranged in the face of cathode-chip wiring 114 with
After be attached to cathode-chip wiring 114.In order to form the connection between cover plate 140 and cathode-chip wiring 114,
Positive wire 134 may be constructed such that and bends in a different direction with in the face of element in connection.
Negative wire 135 electrically connects cathode wiring plate 115 and negative terminal 145.Negative wire 135 can
To be configured to bend with generally " L " shape.More particularly, the Part I of negative wire 135
135a could be arranged in the face of the basal surface of cover plate 140 is to be subsequently incorporated into cover plate 140.Here, negative pole
Insulation board 132 can be placed between Part I 135a and cover plate 140 so that Part I 135a and
Cover plate 140 can be not connected to by electricity each other.It addition, it is upwardly extending in the side different from Part I 135a
The Part II 135b of negative wire 135 could be arranged in the face of cathode wiring plate 115 is to be subsequently incorporated into
Cathode wiring plate 115.In order to form the connection between cover plate 140 and cathode wiring plate 115, negative wire
135 may be constructed such that and bend with in the face of element in connection in a different direction, but the present invention
Many aspects are not limited to this.Such as, negative wire 135 can have the shape of flat board.
Negative insulation plate 132 is placed between the basal surface of negative wire 135 and cover plate 140, so that negative pole
Lead-in wire 135 and cover plate 140 electric insulation.Negative insulation plate 132 can together with the liner 142 described subsequently
So that negative wire 135 and cover plate 140 electric insulation.It addition, negative insulation plate 132 is possible to prevent to be electrically connected
The cover plate 140 of the cathode-chip wiring 114 receiving electrode assemblie 110 conducts electricity into contrary polarity.For permitting
Perhaps terminal hole 135' and 132' that negative terminal 145 passes through can be formed at negative wire 135 and bear
In pole insulation board 132.
Meanwhile, and the situation class that is arranged between cover plate 140 and negative wire 135 of negative insulation plate 132
Seemingly, positive pole insulation board 131 can be arranged between cover plate 140 and positive wire 134.Just can arrange
Pole insulation board 131 is to set up the balance relative to negative insulation plate 13.It is to say, may be inserted into positive pole
Insulation board 131 is to be maintained at the height between cover plate 140 and positive wire 134 and at cover plate 140 with negative
The balance of the height between pole lead-in wire 135.It addition, positive pole insulation board 131 can be placed in cover plate 140 with
Between positive wire 134, to use the combination pin 141 described subsequently to increase during combining in compression
Big bond strength.
Cover plate 140 can be sizing and be configured to the metallic plate corresponding with the top end opening of housing 120.
Cover plate 140 includes combining pin 141, positive terminal 144, negative terminal 145 and liner 142.
In conjunction with pin 141, positive wire 134 is securely combined with cover plate 140.For example, it is possible to assemble from
The combination pin 141 that the basal surface of cover plate 140 highlights is with through positive wire 134, from the end of cover plate 140
The bottom of the combination pin 141 that surface is prominent can be compressed be attached to positive wire by riveting or rotation
The basal surface of 134.Such as, in the case of being combined by riveting, by using hammer from cover plate
The bottom of the combination pin 141 that the basal surface of 140 is prominent, draws the bottom combining pin 141 relative to positive pole
The basal surface compression of line 134.In the case of being combined by rotation, rotated at high speeds by use
Handling implement compacting is exposed to the bottom of the combination pin 141 of the basal surface of positive wire 134, will be in conjunction with pin
The bottom of 141 is compressed relative to the basal surface of positive wire 134.Meanwhile, in other embodiments, just
Pole lead-in wire 134 and cover plate 140 can be bonded to each other by welding.
Positive terminal 144 can be the part highlighted integratedly from cover plate 140 or can be formed as knot
Conjunction is to cover the single component of the top surface of cover plate 140.It addition, be similar to cover plate 140, positive terminal
Son 144 can have positive polarity.Positive terminal 144 can be connected to electrode group by positive wire 134
The positive pole 111 of part 110.
Negative terminal 145 can be assembled with through cover plate 140.Negative terminal 145 can be set up and cover plate
The insulation of 140 connects and extends to the top surface of cover plate 140.Negative terminal 145 can be by negative
Pole lead-in wire 135 is connected to the negative pole 112 of electrode assemblie 110.
More particularly, negative terminal 145 can be assembled with through cover plate 140, insulation board 132 and negative
Terminal hole 140', 132' and 135' of pole lead-in wire 135, the bottom of negative terminal 145 is divided and is crushed on negative pole and draws
On the basal surface of line 135, so that cover plate 140, insulation board 132 and negative wire 135 are with position pair
Neat state combines integrally with each other.
Such as, cover plate 140, insulation board 132 and negative wire 135 stack to cover each other, negative pole end
Son 145 is inserted into assembled with one another terminal hole 140', 132' and 135' from the top of cover plate 140 continuously,
Perform riveting from the bottom of the basal surface being exposed to negative wire 135 of negative terminal 145 or rotate, from
And the state being crushed on the basal surface of negative wire 135 with negative terminal 145 assembles negative terminal 145.
The bottom compression of negative terminal 145 is attached to the basal surface of negative wire 135.But, also to negative
The bottom of extreme son 145 performs welding, thus by negative terminal 145 and negative wire 135 more closely
It is bonded to each other.The combination of negative terminal 145 and negative wire 135 forms the charge/discharge path of negative pole.
Meanwhile, the top of negative terminal 145 highlights, then relative to lid with the shape of plate from its cylinder-shaped body
The top surface of plate 140 is compressed.
Meanwhile, liner 142 is placed between negative terminal 145 and cover plate 140.It is to say, negative pole end
Son 145 assembles with cover plate 140 by being inserted between negative terminal 145 and cover plate 140 by liner 142.
Here, the terminal hole 140' for allowing negative terminal 145 to pass through is formed in cover plate 140.Negative
The state that extreme son 145 is inserted between negative terminal 145 and cover plate 140 with liner 142 is inserted into lid
In the terminal hole 140' of plate 140, so that negative terminal 145 and cover plate 140 electric insulation.Liner 142
The outer peripheral areas of sealed end sub-aperture 140', thus prevent the electrolyte (not shown) being contained in housing 120
Leakage and perform sealing function to prevent foreign matter from penetrating in cover plate 140.
Fig. 4 is the perspective view of the electrode assemblie in secondary cell according to an embodiment of the invention, and Fig. 5 is
The front view of the battery lead plate in secondary cell according to an embodiment of the invention, Fig. 6 is according to the present invention
The amplification front elevation of the electrode tabs in the secondary cell of embodiment.Due to electrode assemblie and above description
Essentially identical, therefore will no longer provide the repetitive description of electrode assemblie and explained below will be concentrated
Structure in electrode tabs.
With reference to Fig. 4 to Fig. 6, electrode assemblie 110 includes positive plate 111, negative plate 112 and is placed in positive pole
Dividing plate 113 between plate 111 and negative plate 112.It addition, electrode assemblie 110 includes being connected to positive plate
111 with the cathode-chip wiring 114 that projects upwards subsequently and are connected to negative plate 112 to project upwards subsequently
Cathode wiring plate 115.
Cathode-chip wiring 114 is formed as being projected into the top of positive plate 111.Here, cathode-chip wiring 114
Including with the first area 114a that positive plate 111 directly contacts, while parallel with first area 114a
The second area 114b that separates with first area 114a and be connected first area 114a and second area
The circular portion 114c of 114b.Here, first area 114a preferably has than second area 114b's
The length that length is big.Furthermore, it is preferred that form circular portion 114c by rounding technique.
Cathode wiring plate 115 can have the structure identical with the structure of cathode-chip wiring 114.Namely
Saying, cathode wiring plate 115 includes the first area 115a directly contacted with negative plate 112, with first
The second area 115b that separates with first area 115a while region 115a is parallel and be connected first
The circular portion 115c of region 115a and second area 115b.
Can be by using laser cut (laser notching) device cutting positive plate 111 and negative plate
The uncoated part of 112 (hereinafter, being referred to as battery lead plate) is to form cathode-chip wiring 114 and negative pole
Lug plate 115 (hereinafter, being referred to as electrode tabs).In such a manner, will have electrode
The battery lead plate 111 and 112 of lug plate 114 and 115 is placed between battery lead plate 111 and 112 with dividing plate 113
Mode wind, thus form electrode assemblie 110.Here, use includes for transmission electrode plate 111
Rolled electrode plate 111 He is carried out with the coiled sheet winding apparatus (not shown) of 112 and multiple rollers of dividing plate 113
112 and dividing plate 113.
The length of first area 114a and 115a of electrode tabs 114 and 115 is more than second area 114b
With the length of 115b, circular portion 114c is formed between first area 114a and second area 114b,
Circular portion 115c is formed between first area 115a and second area 115b, thus prevent by thin,
The electrode tabs 114 and 115 that soft material is made quilt during rolled electrode plate 111 and 112
Roller folds or tear.
More particularly, electrode tabs 114 and 115 or use roller transmission electrode plate 111 is being processed
During 112, if applying tension force to battery lead plate 111 and 112, then stress can concentrate on electrode
Lug plate 114 and 115.The bottom being concentrated in electrode tabs 114 and 115 of stress, i.e. the
One region 114a and 115a.Here, the width of first area 114a and 115a is made larger than the secondth district
The width of territory 114b and 115b, thus prevent the concentration of stress.It addition, circular portion 114c is formed at
Between first area 114a and second area 114b, circular portion 115c is formed at first area 115a
And between second area 115b, can more effectively dispersive stress, thus be effectively prevented electrode tabs
The folding of 114 and 115 or tear.Even if it addition, the width of first area 114a and 115a is by rounded portions
114c and 115c is divided to increase, it is also possible to prevent the overall width of electrode tabs 114 and 115 to heavens
Increase.
Can be the 1 of length B of second area 114b with reference to Fig. 6, the radius A of circular portion 114c
To 1.5 times.If length B that the radius A of circular portion 114c is less than second area 114b, then divide
Dissipate stress low effort, cathode-chip wiring 114 can during rolled electrode assembly 110 fold or
Tear.If it addition, the radius A of circular portion 114c is more than length B of second area 114b
1.5 times, then the length of first area 114a can increase to heavens.It is to say, due to first area 114a
Length increase, distance between the most each cathode-chip wiring 114 reduces, and this is less desirable.
Simultaneously as the radius A of circular portion 114c is the 1 to 1.5 of the length of second area 114b
Times, therefore the length of first area 114a can be 3 to 4 times of length of second area 114b.
It addition, the radius A of circular portion 114c can be the 0.35 of the height C of cathode-chip wiring 114
To 1 times.If the radius A of circular portion 114c is less than the 0.35 of the height C of cathode-chip wiring 114
Times, then the low effort of dispersive stress, cathode-chip wiring 114 can be in the process of rolled electrode assembly 110
Middle folding or tear.If it addition, the radius A of circular portion 114c is more than the height of cathode-chip wiring 114
Degree C, then the length of first area 114a can increase to heavens.Finally, each cathode-chip wiring 114 it
Between distance can reduce, this is less desirable.
Meanwhile, in the case of cathode wiring plate 115, the radius of circular portion 115c can be the secondth district
1 to 1.5 times of the length of territory 115b.It addition, the radius of circular portion 115c can be cathode wiring plate
0.35 to 1 times of the height of 115, this is essentially identical with the situation of cathode-chip wiring 114, will no longer give
Go out repetitive description.
Fig. 7 illustrates the structure according to the electrode tabs in secondary cell according to an embodiment of the invention
Stress distribution.
With reference to Fig. 7, use computer-aided engineering (CAE) to simulate and all include difform electrode
Lug plate (that is, rectangular electrode lug plate (a), trapezoidal electrode tabs b and circular electrode lug plate c)
The winding process of battery lead plate, and its result is shown.Here, will there is 8 μm thickness to 12 μm
Copper Foil or aluminium foil are used as each battery lead plate.It addition, by using rectangular laser to process the uncoated of battery lead plate
Part forms electrode tabs.Additionally, each battery lead plate passes roller at the winding speed with 780mm/s
While be wound.Here, identical tension force is applied to each battery lead plate.In the figure 7, figure is occurred in
Circular strip index stress distributing line and the part instruction of redness in electrode tabs shown in 7 have
The most heavily stressed region.Generally, the band of circular fingernail shape is formed in electrode tabs and electrode connects
Line sheet can fold along this band or tear during rolled electrode plate.
As it is shown in fig. 7, the matrix of electrode tabs (that is, the first area of electrode tabs) is the biggest,
Stress is the least.Therefore, the first area of electrode tabs is the biggest, it is contemplated that minimum to electrode tabs
Degree folds.Specifically, present the stress weakened significantly to concentrate.There is the electrode of circular portion
Lug plate c presents the highest stress dispersion effect, and wherein, electrode tabs c has and connects as electrode
The relatively wide first area of the matrix of line sheet, the overall width of electrode tabs does not increases simultaneously.Therefore,
In the case of using there is the electrode tabs of circular portion, electrode tabs be folded in rolled electrode
It is minimized during plate.
Meanwhile, such as understand from the analog result shown in Fig. 7, when holding under the high speed of 780mm/s
During row winding, the electrode tabs only with circular portion does not fold.Therefore, it is understood that
This electrode tabs illustrates the most desired characteristic based on winding speed.It is to say, there is circle in use
In the case of the electrode tabs of shape part, even if electricity can also be made during the high-speed winding of battery lead plate
The folding of pole lug plate minimizes.
Fig. 8 illustrates the electricity of the size with different numerical value in secondary cell according to an embodiment of the invention
The stress distribution of pole lug plate.
With reference to Fig. 8, by changing the radius of each circular portion and on the top of each electrode tabs
Second area length use computer-aided engineering (CAE) simulate all include circle electrode connect
The winding process of the battery lead plate of line sheet.Table below lists the radius according to circular portion and second area
Length each electrode tabs folding occur or nonevent analog result.
Table 1
(zero: fold and occur, ×: fold and do not occur)
In Table 1, in units of millimeter, all measure the length of second area and the radius of circular portion,
Electrode tabs has the height of fixing 28mm.
As shown in Fig. 8 and Biao 1, electrode tabs d, g and h fold, it will be apparent that stress distribution
Line is shown in other electrode tabs, implies that it folds.It is to say, when connecing at each electrode
When in line sheet, the radius of circular portion is less than the length of second area, electrode tabs a, b, c, e, f
Fold with i.But, when the radius of circular portion equals to or more than the length of second area, as
In electrode tabs d, g and h, fold and do not occur.Therefore, based on analog result, it is understood that
The radius of circular portion is preferably larger or equal than the length of second area.It addition, in order to prevent and electrode
The length of the first area that the matrix of lug plate is corresponding increases to heavens, and the radius of circular portion is the least
In the length of second area 1.5 times.
As it has been described above, in secondary cell according to an embodiment of the invention, formed in electrode tabs
Circular portion is to make firstth district being longer than second area relatively close to battery lead plate of electrode tabs
Territory.Here, circular portion can have the radius of 1 to 1.5 times of length of second area.It addition,
The radius of circular portion can be 0.35 to 1 times of the height of electrode tabs.
It is to say, form circular portion in electrode tabs to increase the length of the matrix of electrode tabs
Degree, thus be effectively prevented stress during rolled electrode plate and concentrate on electrode tabs.Therefore,
It is possible to prevent stress to concentrate on electrode tabs, so that the folding of electrode tabs or tear minimize.
Even if it addition, during high-speed winding battery lead plate, it is also possible to prevent the folding of battery lead plate.Therefore,
High-quality electrode tabs can be obtained, thus prevent two caused due to the fault of electrode tabs
The deterioration of the performance of primary cell or catch fire.
Although the exemplary embodiment with reference to the present invention has specifically illustrated and has described the present invention, but this
Ordinarily skilled artisan will understand that of field, the present invention limited without departing from claim spirit and
In the case of scope, this can be carried out the various changes in form and details.Therefore, it is desirable that, give
The embodiment gone out is considered ginseng that is illustrative rather than restrictive, that make claim in all respects
Examine rather than description above shows the scope of the present invention.
Claims (7)
1. a secondary cell, described secondary cell includes:
Electrode assemblie, including positive plate, negative plate and the dividing plate being placed between positive plate and negative plate；
Electrode tabs, each extension from positive plate and negative plate and be projected into the upper of electrode assemblie
Portion；
Housing, accommodates electrode assemblie；
Cover plate, the top of seal casinghousing；And
Electrode terminal, is projected into the top of cover plate respectively and is connected to electrode tabs,
Wherein, each electrode tabs is included at the sidepiece of electrode tabs the rounded portions being formed as circular
Point.
Secondary cell the most according to claim 1, wherein, electrode tabs have from positive plate
The width that the top-to-bottom separated with negative plate is gradually increased.
Secondary cell the most according to claim 1, wherein, electrode tabs include with positive plate and
The first area of each direct contact in negative plate with while parallel with first area with first area
The second area separated, the length of first area is more than the length of second area.
Secondary cell the most according to claim 3, wherein, circular portion makes first area and second
Region is connected to each other.
Secondary cell the most according to claim 3, wherein, the radius of circular portion is second area
1 to 1.5 times of length.
Secondary cell the most according to claim 1, wherein, the radius of circular portion is electrode connection
0.35 to 1 times of the height of sheet.
Secondary cell the most according to claim 1, wherein, by laser treatment cutting positive plate and
The uncoated part being not coated with positive active material and negative electrode active material of negative plate connects to form electrode
Line sheet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150013523A KR102324345B1 (en) | 2015-01-28 | 2015-01-28 | secondary battery |
| KR10-2015-0013523 | 2015-01-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106207070A true CN106207070A (en) | 2016-12-07 |
| CN106207070B CN106207070B (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510292337.9A Active CN106207070B (en) | 2015-01-28 | 2015-06-01 | Secondary battery |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102324345B1 (en) |
| CN (1) | CN106207070B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024000785A1 (en) * | 2022-06-28 | 2024-01-04 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, and electric device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180097087A (en) * | 2017-02-22 | 2018-08-30 | 삼성에스디아이 주식회사 | Secondary battery having symmetrical multi-tap |
| KR20200041625A (en) * | 2018-10-12 | 2020-04-22 | 삼성에스디아이 주식회사 | Secondary battery |
| JP2024516737A (en) * | 2021-08-05 | 2024-04-16 | エルジー エナジー ソリューション リミテッド | Electrode assembly, battery, battery pack including same, and automobile |
| KR102406005B1 (en) * | 2021-10-28 | 2022-06-08 | 이계설 | Flagforming device after laser notching of secondary batteries for electric vehicles |
| KR20240075735A (en) * | 2022-11-16 | 2024-05-29 | 주식회사 엘지에너지솔루션 | Electrode assembly and battery including same, and battery pack and automobile including such battery |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106207070B (en) | 2020-12-04 |
| KR20160092748A (en) | 2016-08-05 |
| KR102324345B1 (en) | 2021-11-10 |
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