CN104466221A - Secondary battery - Google Patents
Secondary battery Download PDFInfo
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- CN104466221A CN104466221A CN201410478385.2A CN201410478385A CN104466221A CN 104466221 A CN104466221 A CN 104466221A CN 201410478385 A CN201410478385 A CN 201410478385A CN 104466221 A CN104466221 A CN 104466221A
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
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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
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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
- H01M50/572—Means for preventing undesired use or discharge
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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
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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)
- Secondary Cells (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A secondary battery which prevent a short circuit between electrodes with a simple structure and is easy to discharge gas generated in the electrodes is provided. A lithium ion battery (secondary battery) has a diaphragm arranged between the positive electrode and the negative electrode and overlapping cores of the positive electrode and the negative electrode alternately. The diaphragm, on its outer periphery, has a first side and the opposite side of the first side, namely a second side. The positive electrode has a positive electrode current collector, a positive electrode active material and an insulating part. The positive electrode current collector has a positive electrode lead wire more protrusive than the first side. The insulating part is formed on two surfaces of the positive electrode lead wire which is isolated from the edge of the positive electrode active material at least to the outer periphery of the diaphragm. The insulating part is, in a state that the cores are formed, encapsulates the first side of the diaphragm on two sides of the negative electrode in the overlapping direction.
Description
Technical field
The present invention relates to and barrier film is sandwiched between positive plate and negative plate, between the positive plate and the end of negative plate of alternately configuration, there is the secondary cell preventing short-circuit structure.
Background technology
The secondary cells such as lithium ion battery have and sandwich between positive plate and negative plate by barrier film, and the core of alternately configuration positive plate and negative plate.Usually have, between the positive plate of short-movie shape and negative plate, sandwich barrier film, by it to the repeatedly overlapping cascade type core of thickness direction, and sandwich barrier film between the negative plate of the positive plate of long ribbon shape, by the rollback type core of its roll overlap.Positive plate is, has the positive active material mixture layer being coated with positive active material on base material aluminium foil, and have the positive wire exposing aluminium foil at a lateral edges on two sides.Negative plate is, has the negative electrode active material mixture layer being coated with negative electrode active material on base material Copper Foil, and have the negative wire exposing Copper Foil at opposite side edge on two sides.
Positive wire and negative wire are outstanding to opposition side each other from the barrier film both sides of the edge configured between positive plate and negative plate.Now, because the width of the dispensing area of positive active material mixture layer is narrower than the width of the dispensing area of negative electrode active material mixture layer, so in the scope of negative electrode active material mixture layer and positive wire subtend, need consideration to make not to be short-circuited.
The reason of inter-electrode short-circuit may be that the foreign conducting matters such as the electrode fragment produced in the fabrication process cause.This foreign matter is not only in direct contact with between electrode and causes short circuit, and is dissolved in after electrolyte is ionized, and separates out and forms ingotism (Dendrite), also can cause short circuit in the reduction of negative pole place.
There is at the square lithium ion secondary battery of patent documentation 1 record the rolled electrode group (core) of rollback type.Positive plate is, has insulating barrier on the border of positive wire and positive active material mixture layer.This insulating barrier is, overlaps the lateral margin of positive active material mixture layer, and is formed with the thickness equal with positive active material mixture layer.Cover the basic courses department of positive wire with insulating barrier and barrier film, negative electrode active material mixture layer does not contact with positive wire thus.
But, in the discharge and recharge of the secondary cell as lithium ion battery after just manufacturing, the some gas of generation around electrode.If this gas residue in-between the electrodes, not only reduce the performance of battery, and be the Deformation Reasons making battery case expansion etc., so should discharge.The lithium ion battery disclosed at patent documentation 1 is example, forms insulating barrier with the thickness equal with positive active material mixture layer.This insulating barrier is, covers the basic courses department of positive wire together with barrier film, to make itself and surrounding isolate.Therefore, the gas of generation is difficult to discharge to insulating barrier side.
For the core of cascade type, the end of interface membrane, makes positive pole be not in contact with each other mutually with negative pole.But whenever stacked, in order to interface membrane, manufacturing process becomes complicated, and production efficiency reduces.And, if want interface membrane after stacked, then can not engage the scope between positive wire.In addition, for the core of rollback type, if to reel together with negative pole barrier film with positive pole, because the difference of circumference produces dislocation gradually.Therefore, if reel after interface membrane, then can produce distortion, junction surface may be peeled off.
Prior art document
Patent documentation 1
Japanese Patent Publication 2011-216403 publication
Summary of the invention
Given this, the invention provides one and prevent interelectrode short circuit with simple structure, and be easy to the secondary cell of discharging the gas produced at electrode.
Have according to the secondary cell of the present invention one example and sandwich barrier film between a positive electrode and a negative electrode, the core of alternately laminated positive pole and negative pole.Barrier film has the first limit and opposite side thereof and Second Edge in its outer peripheral edges.Just having positive electrode collector, positive active material and insulation division.Positive electrode collector possesses the positive wire more outstanding than the first limit of barrier film.Positive active material covers the two sides than the positive electrode collector of the outer peripheral edges inside scope of barrier film.Insulation division be from the edge isolation of positive active material at least to barrier film outer peripheral edges between the two sides of positive wire formed.Negative pole has negative electrode collector and negative electrode active material.Negative electrode collector possesses the negative wire more outstanding than the Second Edge of barrier film.Negative electrode active material, in the inside of the outer peripheral edges than barrier film, covers the two sides of the negative electrode collector of the wider scope formed than positive active material.And insulation division is, under the state forming core, for making the end of covering negative pole, close the first limit being configured in the barrier film of negative pole both sides with stacked direction.
Now, insulation division is formed at least to the scope of barrier film outer peripheral edges from the scope inside formed than negative electrode active material.In addition, as long as insulation division is formed with the parts comprising the saturable majority of an electrolyte emptying aperture.In addition, insulation division comprises: cover positive wire and formed, and the first solid insulating barrier not allowing electrolyte pass through; And cover the first insulating barrier and formed, and comprise the second insulating barrier of the saturable majority of an electrolyte emptying aperture.The thickness of insulation division is, in the outer peripheral edges position of barrier film, with the thickness of the positive active material formed at side of the positive electrode, and formed at the thickness that the thickness of the negative electrode active material of negative side formation is added respectively, described in the Thickness Ratio of described first insulating barrier, the thickness of positive active material is thin.The thickness of described first insulating barrier is even, and gradually thickeningly the thickness of described second insulating barrier formed to the end of described positive pole.
According to secondary cell of the present invention, the lead-in wire of positive pole has insulation division.Sandwich barrier film between a positive electrode and a negative electrode, form the core of stacked positive pole and negative pole, thus along the negative end on the first limit of barrier film with stacked direction, the first limit being configured in the barrier film of negative pole both sides covers.Therefore, even if the foreign conducting matters such as the electrode fragment produced in the fabrication process are mixed into secondary cell, the short circuit between the positive pole that also can prevent foreign matter from causing and negative pole.
In addition, according to the secondary cell of the present invention forming insulant from the scope inside formed than negative electrode active material at least to the scope of barrier film outer peripheral edges, the position of the positive wire extended from the first limit can be held.According to the secondary cell of the present invention forming insulation division with the parts comprising the saturable majority of an electrolyte emptying aperture, during assembling, electrolyte easily soaks into, and easily discharges the gas produced in discharge and recharge afterwards.
In addition, comprise according to insulation division: cover positive wire and formed, and the first solid insulating barrier not allowing electrolyte pass through; And cover the first insulating barrier and formed, and comprise the secondary cell of the present invention of the second insulating barrier of the saturable majority of an electrolyte emptying aperture, can not generation tree dendrite from positive wire.In addition, even if when the metal dissolving in electrolyte and exist is separated out near positive wire, the metal of precipitation is stoped arrival positive wire by the first insulating barrier.Therefore, the short circuit of positive pole and negative pole can be prevented.
According to the outer peripheral edges position at barrier film, the thickness of insulation division is with the thickness of the positive active material formed at side of the positive electrode, and formed at the thickness that the thickness of the negative electrode active material of negative side formation is added respectively, and the secondary cell of the present invention that the thickness of the Thickness Ratio positive active material of the first insulating barrier is thin, really can cover the negative end of the first avris with barrier film, electrolyte is supplied to positive pole through the second insulating barrier of insulation division simultaneously.And, through the electrolyte of the second insulating barrier also through barrier film, be also supplied to negative pole thus.In addition, the gas produced near the positive pole and negative pole of the first avris can be discharged by the second insulating barrier.
Accompanying drawing explanation
Fig. 1 is the secondary cell stereogram according to the present invention first example.
Fig. 2 is the core exploded perspective view of secondary cell shown in Fig. 1.
Fig. 3 is the laminated portions amplification view of core shown in Fig. 2.
Fig. 4 is the core cutaway view of the secondary cell according to the present invention second example.
Description of reference numerals
1: lithium ion battery (secondary cell) 10: core
11: positive pole 111: positive electrode collector
112: positive active material 113: positive wire
12: negative pole 121: negative electrode collector
122: negative electrode active material 123: negative wire
13: barrier film 131: the first limit
132: Second Edge 13A: outer peripheral edges
14: insulation division 141: the first insulating barrier
142: the second insulating barrier T1:(positive active materials) thickness
T2:(negative electrode active material) thickness
The thickness of the thickness of positive active material and negative electrode active material is added by T4:() thickness
Embodiment
To the secondary cell according to the present invention first example, the situation being useful in lithium ion battery 1 is example, is described referring to figs. 1 through Fig. 3.Be that core 10 and electrolyte are housed in housing 2 at the lithium ion battery 1 shown in Fig. 1, peristome 21 is provided with lid 3.Housing 2 is, except square container as shown in Figure 1, can be cylinder type, can also be the pouch-type formed with laminated film.Positive terminal 101 and negative terminal 102 through lid 3 and arranging respectively.
Core 10 has and is sandwiched between positive pole 11 and negative pole 12 by barrier film 13, and the structure of alternately laminated configuration positive pole 11 and negative pole 12.The core 10 of this example is, as shown in Figure 2, sandwiches between positive pole 11 and negative pole 12 by the longer barrier film 13 of band shape, will be respectively the rollback type core 10 of banded longer positive pole 11 and negative pole 12 winding equally.
In this example, as shown in Figure 2, barrier film 13 has the first limit 131 along banded length direction and is positioned at the Second Edge 132 of its opposite side.Barrier film 13 is, such as, with fine porous film manufactures of polyolefin (Polyolefin) class such as polyethylene (Polyethylene) or polypropylene (Polypropylene), and keeps electrolyte in emptying aperture.
Positive pole 11 is, as shown in Figure 3, has positive electrode collector 111, positive active material 112 and insulation division 14.Positive electrode collector 111 possesses the positive wire 113 more outstanding than the first limit 131 of barrier film 13.In this enforcement state, positive electrode collector 111 is aluminium foils.Positive active material 112 is formed as covering the two sides than the positive electrode collector 111 of the outer peripheral edges 13A inside scope of barrier film 13.Positive active material 112 is that electrode material powder is become slurry (Slurry) with dissolution with solvents, and is coated on the two sides of positive electrode collector 111 equably, dry and formed.Positive active material 112 such as adopts LiMn2O4.Insulation division 14 is formed at least to the two sides of the positive wire 113 between the outer peripheral edges 13A of barrier film 13 from the position that the edge 112A of positive active material 112 isolates.At this example, insulation division 14 is, as shown in Figure 2, is parallel to the edge 112A of positive active material 112 and is formed.Insulation division 14 is coated with slurry in the same manner as positive active material 112.Insulation division 14 is isolated from positive active material 112 and formed, and therefore can be coated with positive active material 112 simultaneously, can also be coated with before or after positive active material 112.
Negative pole 12 has negative electrode collector 121 and negative electrode active material 122.Negative electrode collector 121 possesses the negative wire 123 more outstanding than the Second Edge 132 of barrier film 13.In this enforcement state, negative electrode collector 121 is Copper Foils.Negative electrode active material 122 is formed as the scope in the outer peripheral edges 13A inside than barrier film 13, covers the two sides of the negative electrode collector 121 of the wider scope formed than positive active material 112.Negative electrode active material 122 is coated with slurry in the same manner as positive active material 112.Negative electrode active material 122 such as adopts graphite.
In addition, at this example, as shown in Figure 3, the insulation division 14 formed at positive pole 11 is, under the state forming core 10, for making the end 12A of covering negative pole 12, closes the first limit 131 being configured in the barrier film 13 of negative pole 12 both sides with stacked direction.That is, insulation division 14 is, in the outer peripheral edges 13A position of barrier film 13, and the thickness T1 with the positive active material 112 formed in positive electrode collector 111 side and the thickness T4 be added respectively at the thickness T2 of the negative electrode active material 122 of negative electrode collector 121 side formation.Strictly, in the position of the outer peripheral edges 13A of barrier film 13, the thickness T4 of insulation division 14 also comprises the thickness of negative electrode collector 121 half.Therefore, get involved barrier film 13 with stacked direction in the both sides of negative pole 12 and configure positive pole 11, the first limit 131 of barrier film 13 is extruded bending by insulation division 14 and abuts against together thus.
Now, in the face of the end 14A of the insulation division 14 of positive active material 112, as shown in Figure 3, be positioned at the position of the scope inside formed than negative electrode active material 122, and formed with the thickness that the thickness T1 with positive active material 112 is identical.And insulation division 14 is at the end 14B being positioned at barrier film 13 outer peripheral edges 13A, for making to reach thickness T4, formed along gradually thickening to the direction of end 14B.Therefore, insulation division 14 is clipped in the end 12A of negative pole 12 and fixes, and keeps positive wire 113.
In addition, insulation division 14 is the parts comprising the majority emptying aperture that electrolyte soaks into, such as, formed with the material of ceramic-like.Therefore, after assembling lithium ion battery 1, when original charge or electric discharge, from the gas permeation insulation division 14 that positive pole 11 produces, discharge to core 10 outside.In addition, from the gas that negative pole 12 produces, through the insulation division 14 of barrier film 13 or presses against diaphragm 13, the outside to core 10 is discharged.In addition, insulation division 14 is isolated from the edge 112A of positive active material 112 and is formed, and therefore can not reduce the area releasing lithium ion from positive active material 112.
In the core 10 of Fig. 2 as constructed as above, positive pole 11 is that negative pole 12 is for the state of barrier film 13 to the outstanding negative wire 123 in Second Edge 132 side for the state of barrier film 13 to the first outstanding positive wire 113 in side, limit 131, staggers respectively and overlapping.As shown in Figure 2, with the order of positive pole 11, barrier film 13, negative pole 12, barrier film 13, sandwich barrier film 13 between positive pole 11 and negative pole 12 and form core 10 with the state of overlapping 4 winding.To the positive wire 113 that the first side, limit 131 is outstanding, and the negative wire 123 outstanding to Second Edge 132 side, respectively to stacked direction binding with joints such as welding or solderings.Be connected to positive terminal 101 and the negative terminal 102 of lid 3 setting from the positive wire 113 of core 10 extension and negative wire 123 after binding.
Lithium ion battery 1 as constructed as above is, the first limit 131 of barrier film 13 is closed by insulation division 14 and the end 12A of negative pole 12 is capped.Therefore, even if the foreign conducting matters such as the electrode fragment be mixed in the fabrication process are attached to the first limit 131, also can not make positive wire 113 short circuit on negative pole 12.In addition, on the first limit 131, barrier film 13 is abutted against together by insulation division 14, but does not engage.That is, overlapping positive pole 11, negative pole 12 and barrier film 13 and reel time, even if girth produces difference, also can not there is barrier film 13 and be stretched or the phenomenon of distortion.
In addition, in Second Edge 132 side of barrier film 13, negative pole 12 forms negative electrode active material 122 more laterally than the end of positive pole 11, and before it, be extended with negative wire 123.Therefore, even if conductive foreign matter enters Second Edge 132 side, foreign matter can not reach and make negative wire 123 short circuit in the position of positive pole 11.But, from the position of the edge isolation of negative electrode active material 122, at the negative wire 123 of the position on corresponding first limit 131, insulation division 14 can be set in the same manner as positive wire 113.
To the secondary cell according to the present invention second example, to be useful in the situation of lithium ion battery 1, be described with reference to Fig. 4.The lithium ion battery 1 of the second example is, the structure of its insulation division 14 and the lithium ion battery 1 of the first example different, other formation is identical with the lithium ion battery 1 of the first example.Therefore, at the lithium ion battery 1 of the second example, the formation of the lithium ion battery 1 with the first example is had to the formation of identical function, give identical symbol in the following description, and its detailed description is just with reference to the record of the first example.
Fig. 4 is core 10 cross section in the stacking direction of the first side, limit 131 that barrier film 13 is shown.Insulation division 14 has the first insulating barrier 141 and the second insulating barrier 142.First insulating barrier 141 is the solid parts not allowing electrolyte pass through, and covers positive wire 113 and is formed.First insulating barrier 141 is formed with the material of synthetic resin agent.The thickness T1 of the Thickness Ratio positive active material 112 of this first insulating barrier 141 is thin.Second insulating barrier 142 is the parts containing the saturable majority of an electrolyte emptying aperture, covers the first insulating barrier 141 and is formed.The thickness of the first insulating barrier 141 is even, and gradually thickeningly the thickness of the second insulating barrier 142 formed to the end of positive pole 11.To the material of the second insulating barrier 142, as long as the material of Xing Cheng Tu film, the TPO such as polyethylene or polypropylene organic material can be adopted, or the inorganic material of ceramic-like.
According to the lithium ion battery 1 of the second example as constructed as above, even if form ingotism in insulation division 14, can prevent ingotism from reaching positive wire 113 by the first insulating barrier 141 of insulation division 14.In addition, the thickness of the Thickness Ratio positive active material 112 of the first insulating barrier 141 is thin, the gas produced around the positive pole 11 of positive wire 113 side when carrying out charging and discharging after just assembled battery thus, can be discharged to the outside of core 10 by the second insulating barrier 142.
In addition, secondary cell according to the present invention is, to include the lithium ion battery 1 of rollback type core 10, describes the first example as above and the second example, but also can adopt same technology to cascade type core.When the secondary cell of included layer stack-type core adopts according to technology of the present invention, the effect identical with the effect that the secondary cell (lithium ion battery 1) of the above-mentioned rollback type that includes core 10 obtains can be obtained.
Claims (7)
1. a secondary cell, comprises and sandwiching having the first limit and the described opposite side on the first limit and the barrier film of Second Edge in outer peripheral edges between a positive electrode and a negative electrode, and the core of alternately laminated described positive pole and described negative pole,
Described positive pole comprises: positive electrode collector, possesses the positive wire more outstanding than described first limit of described barrier film; Positive active material, covers the two sides of the described positive electrode collector of the outer peripheral edges inside scope than described barrier film; And insulation division, be formed in from the edge isolation of described positive active material at least to described barrier film outer peripheral edges between the two sides of described positive wire,
Described negative pole comprises: negative electrode collector, possesses the negative wire more outstanding than the Second Edge of described barrier film; And negative electrode active material, in the inside of the outer peripheral edges than described barrier film, cover the two sides of the described negative electrode collector of the wider scope formed than described positive active material,
Described insulation division is, under the state that described core is formed, for making the end of the described negative pole of covering, closes described first limit being configured in the described barrier film of described negative pole both sides with stacked direction.
2. secondary cell according to claim 1, is characterized in that,
Described insulation division is, the scope inside formed than described negative electrode active material is risen in the scope at least to the described outer peripheral edges of described barrier film and formed.
3. secondary cell according to claim 1 and 2, is characterized in that,
Described insulation division is that the parts comprising the saturable majority of an electrolyte emptying aperture are formed.
4. secondary cell according to claim 1 and 2, is characterized in that,
Described insulation division comprises: cover described positive wire and formed, the first solid insulating barrier not allowing electrolyte pass through; And cover described first insulating barrier and formed, and comprise the second insulating barrier of the saturable majority of an electrolyte emptying aperture.
5. secondary cell according to claim 4, is characterized in that,
The thickness of described insulation division is, in the outer peripheral edges position of described barrier film, is formed with the thickness that the thickness of the described positive active material formed at described side of the positive electrode and the thickness of described negative electrode active material that formed in described negative side are added respectively,
Described in the Thickness Ratio of described first insulating barrier, the thickness of positive active material is thin.
6. secondary cell according to claim 4, is characterized in that,
The thickness of described first insulating barrier is even, and gradually thickeningly the thickness of described second insulating barrier formed to the end of described positive pole.
7. secondary cell according to claim 1, is characterized in that,
The thickness of described insulation division is, in the outer peripheral edges position of described barrier film, is formed with the thickness that the thickness of the described positive active material formed at described side of the positive electrode and the thickness of described negative electrode active material that formed in described negative side are added respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013195259A JP6146232B2 (en) | 2013-09-20 | 2013-09-20 | Secondary battery |
| JP2013-195259 | 2013-09-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104466221A true CN104466221A (en) | 2015-03-25 |
| CN104466221B CN104466221B (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410478385.2A Active CN104466221B (en) | 2013-09-20 | 2014-09-18 | Secondary battery |
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| Country | Link |
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| JP (1) | JP6146232B2 (en) |
| KR (1) | KR101613019B1 (en) |
| CN (1) | CN104466221B (en) |
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| CN107026281A (en) * | 2015-12-01 | 2017-08-08 | 汽车能源供应公司 | Lithium rechargeable battery |
| CN108336286A (en) * | 2018-03-26 | 2018-07-27 | 珠海格力电器股份有限公司 | A kind of big soft bag lithium ionic cell and preparation method thereof |
| CN108886128A (en) * | 2016-04-08 | 2018-11-23 | 锂能源和电力有限责任两合公司 | Energy accumulating device |
| CN111247659A (en) * | 2017-09-14 | 2020-06-05 | 远景Aesc日本有限公司 | Laminated battery and battery module |
| CN111699585A (en) * | 2018-08-13 | 2020-09-22 | 株式会社Lg化学 | Stack-folding type electrode assembly and lithium metal battery including the same |
| CN113348574A (en) * | 2019-01-29 | 2021-09-03 | 松下电器产业株式会社 | Laminated secondary battery |
| CN114616707A (en) * | 2019-10-25 | 2022-06-10 | 夏普株式会社 | Laminated battery |
| WO2023216038A1 (en) * | 2022-05-07 | 2023-11-16 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6834857B2 (en) * | 2017-09-04 | 2021-02-24 | トヨタ自動車株式会社 | How to manufacture a secondary battery |
| KR102096983B1 (en) | 2017-09-08 | 2020-04-03 | 주식회사 엘지화학 | Battery module with a structure to break a connector using venting gas |
| JP2019053917A (en) * | 2017-09-15 | 2019-04-04 | マクセルホールディングス株式会社 | Electrochemical element |
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| CN113348574B (en) * | 2019-01-29 | 2024-05-14 | 松下控股株式会社 | Stacked secondary battery |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20150032785A (en) | 2015-03-30 |
| JP2015060788A (en) | 2015-03-30 |
| JP6146232B2 (en) | 2017-06-14 |
| KR101613019B1 (en) | 2016-04-15 |
| CN104466221B (en) | 2017-04-12 |
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