CN105531848A - Cap assembly including safety belt having leakage path blocking protrusion part, and lithium secondary battery including same - Google Patents
Cap assembly including safety belt having leakage path blocking protrusion part, and lithium secondary battery including same Download PDFInfo
- Publication number
- CN105531848A CN105531848A CN201480050178.5A CN201480050178A CN105531848A CN 105531848 A CN105531848 A CN 105531848A CN 201480050178 A CN201480050178 A CN 201480050178A CN 105531848 A CN105531848 A CN 105531848A
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- China
- Prior art keywords
- connection part
- cap assembly
- gas discharge
- current interruption
- discharge section
- Prior art date
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title abstract description 10
- 229910052744 lithium Inorganic materials 0.000 title abstract description 10
- 230000000903 blocking effect Effects 0.000 title abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 28
- 239000003792 electrolyte Substances 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 7
- 230000000712 assembly Effects 0.000 claims 7
- 238000000429 assembly Methods 0.000 claims 7
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract 5
- 238000010168 coupling process Methods 0.000 abstract 5
- 238000005859 coupling reaction Methods 0.000 abstract 5
- 239000007789 gas Substances 0.000 description 23
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000021472 generally recognized as safe Nutrition 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
-
- 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
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- 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
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
-
- 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
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/591—Covers
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention relates to a cap assembly provided to one open side of a battery case to seal up the battery case, and a lithium secondary battery including the cap assembly, the cap assembly comprising: a current blocking member including a first coupling part, a first outer circumferential part formed by extending from the first coupling part, and a first gas discharging part formed at the first outer circumferential part; and a safety belt including a second coupling part of which one side is combined with the first coupling part and of which the other side includes a protrusion part protruding in a direction opposite to one side, a second outer circumferential part formed by extending from the second coupling part, and a second gas discharging part formed at the second outer circumferential part.
Description
Technical field
The present invention relates to the lithium secondary battery of recharge and electric discharge, and more specifically, the present invention relates to the lithium secondary battery that a kind of fail safe is higher than existing lithium secondary battery.
Background technology
Along with the development gradually of mobile device, the demand for such mobile device also increases thereupon, as the energy source of mobile device, also sharply increases the demand of secondary cell.In these secondary cells, lithium secondary battery has high-energy-density and discharge voltage, has carried out large quantity research to this, and it has been commercially used now and has widely used.
Based on the shape of battery container, secondary cell can be classified as to have the cylindrical battery of the electrode assemblie be arranged in cylindrical metal tank, have the pouch type battery of the prismatic battery of the electrode assemblie be arranged in prismatic metal tank or the electrode assemblie in having the pouch type battery housing that is arranged on and is made up of aluminum-laminated sheets.
Fig. 1 is the vertical section perspective view that general cylindrical battery is typically shown.
With reference to Fig. 1, by being placed in hydrostatic column 130 by jelly roll (winding-type) electrode assemblie 120, electrolyte is injected hydrostatic column 130, and electrode terminal (such as, positive electrode terminal will be had; Not shown) top cap 140 be connected to the upper end of the opening of hydrostatic column 130 to manufacture column secondary battery 100.
Electrode assemblie 120 is configured to have following structure, wherein, under the state that separator 123 is placed between positive electrode 121 and negative electrode 122, positive electrode 121 and negative electrode 122 is wound in circle.Cylindrical center pin 150 is inserted in the winding center (that is, the center of jellyroll) of electrode assemblie 120.Centrepin 150 is made up of metal material usually, makes this centrepin 150 present predetermined intensity.Centrepin 150 is configured to have the hollow cylindrical structure formed by coiled metal sheet.Centrepin 150 is for fixing and support electrode assembly 120.In addition, centrepin 150 is used as the passage of the gas of to discharge during the charging and discharging of battery or produced by reaction in battery at the run duration of battery.
With reference to Fig. 2, top cap 140 is outstanding to form positive electrode terminal.Top cap 140 has discharge port.Be disposed in order pushing up below cap 140: when increasing for temperature in the battery by the remarkable increase of cell resistance positive temperature coefficient (PTC) element 142 of interruptive current, break with the safety valve 143 of emission gases during pressure increase in the battery, with connecting plate 145, this connecting plate 145 is connected to the safety valve 143 of side at its upper end and is connected to the positive pole of electrode assemblie 144 via the lead-in wire 146 in its side, lower end.
Summary of the invention
Technical problem
An object of the present invention is to provide a kind of cap assembly under high weld strength with high finished product rate, improve machinability thus, different from existing lithium secondary battery.In addition, another object of the present invention is to provide a kind of lithium secondary battery, and it can block the leakage paths of gas or electrolyte outflow lithium secondary battery, has the fail safe of improvement thus.
Technical solution
According to an aspect of the present invention, can realize above-mentioned and other object by providing a kind of cap assembly, this cap assembly is designed to as described below, even if also to have high finished product rate under high weld strength, improve machinability thus.
Cap assembly can comprise current interruption element and safety valve, and current interruption element comprises the first connection part, from the first peripheral part of the first connection part extension and the first gas discharge section in the first peripheral part formation; Safety valve comprises the second connection part, from the second peripheral part of the second connection part extension and the second gas discharge section in the second peripheral part formation, second connection part has the surface being connected to the first connection part and the projection formed on its another surface, and projection is projected upwards in the side that a surface with the second connection part is contrary.
Second connection part can have the maximum ga(u)ge of 1.5 times of the minimum thickness of the first connection part being equal to or greater than current interruption element.Specifically, the maximum ga(u)ge of the second connection part can equal 2 times of the minimum thickness of the first connection part of current interruption element to 5 times.According to circumstances, the maximum ga(u)ge of the second connection part can comprise the thickness of projection.When the thickness of described projection increases and the minimum thickness of the first connection part of current interruption element reduces, can effectively by gas or electrolyte along its leakage paths leaked and external environment condition isolated.As a result, rate of finished products and machinability can be improved.Second connection part can comprise non-protruding portion.In this case, non-protruding portion can have the average thickness of the minimum thickness being equal to or less than the first connection part.
According to non-limiting example of the present invention, the first connection part can comprise the protuberance given prominence on a surface from the first peripheral part towards the second connection part or from the first peripheral part towards the bend of a surface curvature of the second connection part.In this case, the minimum thickness of the first connection part can be the thickness of protuberance or bend.
According to non-limiting example of the present invention, current interruption element and safety valve are coupled to each other by welding.Can weld towards safety valve on current interruption element.Now, the first connection part and the second connection part can be coupled to each other, and make when observing projection in cross section, are formed with the weld part outstanding from the first connection part towards the second connection part.Particularly, the first connection part and the second connection part can be coupled to each other by be selected from ultrasonic bonding, laser welding, resistance welded and arc welding one or more of.Make by welding to be connected between the first connection part and the second connection part as a result, electrolyte or gas can only be formed in projection along its leakage paths leaked.
Weld part is formed spine's shape.When the highest portion of spine divide extend through projection, the crackle limited between face of weld and base material is directly connected in external environment condition, makes gas or electrolyte can by the mode identical with conventional art via Crack Leakage.Therefore, when the thickness of projection increases and the minimum thickness of the first connection part of current interruption element reduces, the leakage paths that gas or electrolyte leak along it can effectively be blocked.
The height of weld part can be positioned at the scope of the maximum ga(u)ge of the second connection part.The diameter of weld part can be positioned at the area of the basal surface of projection or the scope of diameter.
Can be positioned at according to the minimum thickness of the first connection part of the current interruption element of non-limiting example of the present invention and equal the scope of 0.6 times to 0.7 times that conventional current interrupts the minimum thickness of the first connection part of component.In addition, the maximum ga(u)ge of the second connection part can be equal to or greater than 2 times of the maximum ga(u)ge of the second connection part of the bossed conventional security valve of not tool.The maximum ga(u)ge of the second connection part of the bossed conventional security valve of tool can not equal the thickness in non-protruding portion.
Specifically, when the minimum thickness that conventional current interrupts the first connection part of component is 0.5mm, the minimum thickness according to the first connection part of the current interruption element of non-limiting example of the present invention can be 0.3mm.In addition, when the maximum ga(u)ge of the second connection part of conventional security valve is 0.3mm, can be 0.7mm according to the maximum ga(u)ge of the second connection part of non-limiting example of the present invention.
The basal surface of projection can have and equals or the area larger than the correspondence surface surperficial towards of the second connection part of the first connection part.That is, the area of the basal surface of projection can be equal to or greater than the area on the correspondence surface of the first connection part.In addition, projection can have the quadrangular cross-section shape that can cover the first connection part with even height completely.
A surface of the second connection part and another surface can have the area large towards one of the second connection part surperficial correspondence surface than the first connection part.
Cap assembly may further include the liner for current interruption element, wherein, liner for current interruption element can comprise the 3rd connection part and the 3rd gas discharge section, 3rd connection part is arranged on the first peripheral part place of current interruption element, 3rd gas discharge section is formed in the 3rd connection part place, and the 3rd gas discharge section is communicated with the first and second gas discharge sections.
Second peripheral part can comprise the divider wall parts and the peripheral portion bending from the periphery of divider wall parts that bend from the periphery of the second connection part.Second gas discharge section can comprise second groove at the bending area place be formed between the second connection part and divider wall parts, and is formed in first groove at the bending area place between divider wall parts and peripheral portion.
First gas discharge section can be through the through hole that the first peripheral part is formed.In addition, the 3rd gas discharge section can be through the through hole that the 3rd connection part is formed.
Cap assembly can be configured to have such structure: current interruption element, liner for current interruption element, safety valve, positive temperature coefficient (PTC) element and the top cap with one or more gas discharging port are stacked setting, and liner can be arranged on the outer surface of stacked structure further.
According to other aspects of the invention, provide the electrochemical cell being configured with following structure and the equipment using this electrochemical cell as power supply, wherein, the cap assembly with said structure is mounted the open surfaces place of battery container, and this battery container has reception and has electrode stack and electrolyte.Electrode stack can comprise positive electrode, negative electrode and separator, and electrode stack is configured to have following stacked structure, and wherein separator is placed between positive electrode and negative electrode.
Accompanying drawing explanation
Illustrate by reference to the accompanying drawings and below, more clearly can understand the present invention above-mentioned and other object, other advantage of characteristic sum, wherein:
Fig. 1 is the vertical section perspective view that general column secondary battery is shown;
Fig. 2 is the vertical section view that general cap assembly is shown;
Fig. 3 is the cutaway view of the column secondary battery typically illustrated according to non-limiting example of the present invention;
Fig. 4 is the perspective view that the safety valve used in the battery of Fig. 3 is shown;
Fig. 5 is the perspective view that the current interruption element used at the battery of Fig. 3 is shown;
Fig. 6 is the cross-section photograph of the weld part illustrated between current interruption element and Generally Recognized as safe valve; And
Fig. 7 and 8 illustrates current interruption element and the cross-section photograph according to the weld part between the safety valve of non-limiting example of the present invention.
Embodiment
Now, exemplary embodiment of the present invention is described with reference to the accompanying drawings in detail.However, it should be understood that scope of the present invention does not limit by illustrated embodiment.
Fig. 3 typically illustrates the cutaway view of the column secondary battery according to non-limiting example of the present invention, Fig. 4 is the perspective view that the safety valve used in the battery of Fig. 3 is shown, and Fig. 5 is the perspective view that the current interruption element used at the battery of Fig. 3 is shown.
With reference to Fig. 3, manufacture in the following way according to battery 100 of the present invention: electrode assemblie 110 is inserted in container 200, electrolyte is injected in container 200, and cap assembly 300 is arranged on the upper end opened wide of container 200.
Cap assembly 300 is configured to have following structure: under top cap 310 and the state intimate contact with one another for reducing the safety valve 320 of internal pressure, top cap 310 and safety valve 320 are disposed in liner 400, described liner 400 is arranged in the upper crimp unit 210 of container 200, for keeping air-tightness.The middle part of top cap 310 projects upwards, thus when pushing up cap 310 and being connected to external circuit, top cap 310 is used as positive electrode terminal, and is formed with multiple through hole 312 along the periphery of the protuberance of top cap 310, and the gas-pressurized in container 20 is discharged to outside container 20 by described through hole.
Safety valve 320 is membrane structures that electric current flows therethrough.Safety valve 320 is entreated wherein and is provided with the second recessed connection part 322.Second connection part 322 has projection 700.Safety valve 320 is also provided with the second peripheral part, and it comprises divider wall parts 323 and peripheral portion 325.Groove 326 is formed in the lower bending area place between the second connection part 322 and divider wall parts 323, and another groove 324 is formed in the upper bending area place between divider wall parts 323 and peripheral portion 325.Groove 324 and 326 has the different degree of depth.
As shown in Figures 3 and 4, top one in groove 324 and 326, i.e. the first groove 324 are configured to have closed bends, and in groove 324 and 326 on the lower one, i.e. the second groove 326 are configured to have open bends.
Current interruption element 600 is installed in the below of safety valve 320, for the gas in battery is discharged to outside battery, and interruptive current simultaneously.Current interruption element 600 is conductive members.Liner 800 for current interruption element is arranged on current interruption element 600 place.
As shown in Figure 5, current interruption element 600 comprises the first connection part 601 and the first peripheral part 602, first connection part 601 has the portion that projects upwards 620 being formed in its center, first peripheral part 602 has multiple through hole 610, multiple through hole 610 is formed around the first connection part 601, and gas is discharged by multiple through hole 610.Three through holes 630 are formed around protuberance 620 with aturegularaintervals.Through hole 630 is interconnected via three the bridge portions 640 also formed with aturegularaintervals.Place of each bridge portion 640 is formed with otch 650.When the pressure in battery increases, thus when making gas-pressurized be applied to safety valve 320, the second recessed connection part 322 moves up.As a result, otch 650 breaks, thus, be connected to the protuberance 620 of the second connection part 322 and the body portion of current interruption element 600 from.
With reference to shown in Figure 4 and 5, the top surface of protuberance 620 and the basal surface of recessed central part 322 are coupled to each other by welding or similar mode.Now, gap may be formed between face of weld and base material.As a result, moisture may infiltrate battery, or electrolyte may from battery drain.In order to prevent the infiltration of moisture or electrolytical leakage, the top surface place of recessed central part 322 is formed with projection 700.
The leakage paths limited by the gap between face of weld and base material is only formed in projection 700.Therefore, can Leakage prevention path and external contact, thus fundamentally prevent leak of liquid.In addition, excessively gas is not produced.As a result, be delayed the short circuit of current interrupt device (CID), thus prevent thermal runaway (thermalrunaway), therefore substantially increase the fail safe of battery.
With reference to Fig. 6 and Fig. 7, if as seen from Figure 6, in existing battery, the leakage paths formed between face of weld and base material is connected to outside, and if as seen from Figure 7, in battery according to an embodiment of the invention, leakage paths is formed in projection 700, and leakage paths and external environment condition are isolated.
< manufactures example 1 to 10>
As shown in Figure 8, according to change shown in hereafter the first connection part protuberance minimum thickness A and change the maximum ga(u)ge B of the second connection part, to manufacture the example of the cap assembly according to non-limiting example of the present invention.
[table 1]
Can find out from table 1, even if when average weld strength is increased to 5.48kgf to improve machinability, also can make the leakage path of electrolyte and gases did escape and external environment condition isolated, the rate of finished products according to cap assembly of the present invention, production efficiency and fail safe can be improved thus.
Bossed traditional second connection part of tool does not have the maximum ga(u)ge of 0.3mm usually.Therefore, in traditional architectures, when welding with the average weld strength of 5.48kgf, gas or electrolyte easily may leak out battery.
Industrial applicability
As apparent from description above, cap assembly according to the present invention is constructed such that the maximum ga(u)ge of the second connection part is greater than the minimum thickness of the first connection part.Therefore, when the first connection part and the second connection part are coupled to each other by welding, the leakage paths that gas or electrolyte occur to leak only is formed in the second connection part.Therefore, even if when weld strength is higher, the rate of finished products of cap assembly, production efficiency and fail safe can also be improved.
Claims (20)
1. a cap assembly, described cap assembly is installed in an open surfaces of battery container, and to seal described battery container, described cap assembly comprises:
Current interruption element, described current interruption element comprises:
First connection part;
From the first peripheral part that described first connection part extends; With
Be formed in first gas discharge section at described first peripheral part place; And
Safety valve, described safety valve comprises:
Second connection part, a surface of described second connection part is coupled to described first connection part, and another surface of described second connection part is formed with projection, thus the described projection direction contrary along a surface with described second connection part is given prominence to;
From the second peripheral part that described second connection part extends; With
Be formed in second gas discharge section at described second peripheral part place.
2. cap assembly according to claim 1, wherein, the maximum ga(u)ge of described second connection part is equal to or greater than 1.5 times of the minimum thickness of described first connection part of described current interruption element.
3. cap assembly according to claim 2, wherein, the described maximum ga(u)ge of described second connection part equals 2 times to 5 times of the described minimum thickness of described first connection part of described current interruption element.
4. cap assembly according to claim 1, wherein, described first connection part comprises:
Protuberance, described protuberance is outstanding from described first peripheral part towards a surface of described second connection part; Or
Bend, described bend is from described first peripheral part towards a surface curvature of described second connection part.
5. cap assembly according to claim 1, wherein, a surface of described second connection part and the area on another surface are greater than the area towards one of described second connection part surperficial correspondence surface of described first connection part.
6. cap assembly according to claim 1, wherein, described second connection part comprises non-protruding portion, and the average thickness in described non-protruding portion is equal to or less than the minimum thickness of described first connection part.
7. cap assembly according to claim 1, wherein, described first connection part and described second connection part are coupled to each other by welding.
8. cap assembly according to claim 7, wherein, described welding is selected from following at least one: ultrasonic bonding, laser welding, resistance welded and arc welding.
9. cap assembly according to claim 1, wherein, described first connection part and described second connection part are coupled to each other, thus when observing in cross section, are formed with the weld part be projected into from described first connection part the described projection of described second connection part.
10. cap assembly according to claim 1, wherein, the area of the basal surface of described projection is equal to or greater than the area towards one of described second connection part surperficial correspondence surface of described first connection part.
11. cap assemblies according to claim 1, wherein, only form leakage paths in described projection, thus make described leakage paths and external environment condition isolated, electrolyte or gas leak along described leakage path.
12. cap assemblies according to claim 1, comprise the liner for described current interruption element further, wherein, described liner for described current interruption element comprises the 3rd connection part and the 3rd gas discharge section, described 3rd connection part is installed in the described first peripheral part place of described current interruption element, described 3rd gas discharge section is formed in described 3rd connection part place, thus described 3rd gas discharge section is connected with described second gas discharge section with described first gas discharge section.
13. cap assemblies according to claim 1, wherein, described second peripheral part comprises divider wall parts and peripheral portion, and described divider wall parts bends from the periphery of described second connection part, and described peripheral portion bends from the periphery of described divider wall parts.
14. cap assemblies according to claim 13, wherein, described second gas discharge section comprises the second groove and the first groove, described second groove is formed in the bending area between described second connection part and described divider wall parts, and described first groove is formed in the bending area between described divider wall parts and described peripheral portion.
15. cap assemblies according to claim 1, wherein, the through hole that described first gas discharge section is through described first peripheral part and is formed.
16. cap assemblies according to claim 12, wherein, the through hole that described 3rd gas discharge section is through described 3rd connection part and is formed.
17. cap assemblies according to claim 1, wherein, described cap assembly is configured to have following structure: described current interruption element, the liner for described current interruption element, described safety valve, positive temperature coefficient (PTC) element are stacked setting with the top cap with one or more gas discharge end mouth, and are provided with liner further at the outer surface place of described stacked structure.
18. 1 kinds of electrochemical cells, described electrochemical cell is configured to have following structure: the cap assembly according to any one of claim 1 to 17 is installed in the open surfaces place of battery container, accommodates electrode stack and electrolyte in described battery container.
19. electrochemical cells according to claim 18, wherein, described electrode stack comprises positive electrode, negative electrode and separator, and described electrode stack is configured to have following stacked structure: described separator is placed between described positive electrode and described negative electrode.
20. 1 kinds use electrochemical cell according to claim 18 as the equipment of power supply.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130113013A KR101634764B1 (en) | 2013-09-24 | 2013-09-24 | Cap Assembly Comprising Safety Member Having Protrusion Part being formed for Preventing Leak Path and Lithium Secondary Battery Comprising The Same |
| KR10-2013-0113013 | 2013-09-24 | ||
| PCT/KR2014/005830 WO2015046721A1 (en) | 2013-09-24 | 2014-07-01 | Cap assembly including safety belt having leakage path blocking protrusion part, and lithium secondary battery including same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105531848A true CN105531848A (en) | 2016-04-27 |
| CN105531848B CN105531848B (en) | 2018-01-23 |
Family
ID=52743810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480050178.5A Active CN105531848B (en) | 2013-09-24 | 2014-07-01 | Cap assembly including the safety valve with the projection for blocking leakage paths and the lithium secondary battery including the cap assembly |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6169798B2 (en) |
| KR (1) | KR101634764B1 (en) |
| CN (1) | CN105531848B (en) |
| WO (1) | WO2015046721A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109564996A (en) * | 2016-08-01 | 2019-04-02 | 江森自控科技公司 | The additives for overcharge protection system with dual spiral disk feature of square lithium ion battery cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102358434B1 (en) * | 2015-04-17 | 2022-02-04 | 삼성에스디아이 주식회사 | Secondary battery |
| CN107415887B (en) * | 2016-05-24 | 2023-11-10 | 上汽通用五菱汽车股份有限公司 | Safety belt installation component |
| KR102347978B1 (en) * | 2017-07-28 | 2022-01-07 | 주식회사 엘지에너지솔루션 | Secondary battery |
| KR102479450B1 (en) * | 2018-03-16 | 2022-12-21 | 주식회사 엘지에너지솔루션 | Secondary battery and manufacture method for the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101634764B1 (en) | 2016-06-29 |
| JP6169798B2 (en) | 2017-07-26 |
| KR20150033254A (en) | 2015-04-01 |
| CN105531848B (en) | 2018-01-23 |
| JP2016534525A (en) | 2016-11-04 |
| WO2015046721A1 (en) | 2015-04-02 |
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