CN111146371A - Safety cap of quick-charging battery - Google Patents
Safety cap of quick-charging battery Download PDFInfo
- Publication number
- CN111146371A CN111146371A CN201811313592.7A CN201811313592A CN111146371A CN 111146371 A CN111146371 A CN 111146371A CN 201811313592 A CN201811313592 A CN 201811313592A CN 111146371 A CN111146371 A CN 111146371A
- Authority
- CN
- China
- Prior art keywords
- sealing ring
- cap
- explosion
- quick
- rupture membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012528 membrane Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 41
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 11
- 238000004880 explosion Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 5
- 238000010073 coating (rubber) Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007306 turnover Effects 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
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
- H01M50/10—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
- H01M50/183—Sealing members
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- 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)
- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to a safety cap of a quick-charging battery, which comprises an upper cap, an explosion-proof membrane with a wall body, a pore plate, an inner sealing ring and an outer sealing ring, wherein the upper cap is arranged on the upper end surface of the explosion-proof membrane in a state of being bent inwards and compressed by the wall body and being welded on the upper end surface of the upper cap in a multi-point ultrasonic welding manner, a plurality of air outlet holes are uniformly distributed in the upper cap, the pore plate is welded at the central part of the lower end surface of the explosion-proof membrane, the outer wall of the upper cap and the outer wall of the explosion-proof membrane are coated with glue, the upper edge and the lower edge of the outer sealing ring are bent inwards and coated with glue to compress the upper cap or the upper end surface of the explosion-proof membrane bent wall body and the lower end surface of.
Description
Technical Field
The invention relates to a battery cap, in particular to a safety cap of a quick-charging battery.
Background
The power battery cap is a key component of a power battery, namely a high-current lithium ion battery, and is directly related to the safety performance, the capacity, the service life and the safety of passing high current of the battery, and the production and use safety of a producer and a user. The existing cylindrical power battery cap mainly comprises an upper cap, a gasket, an explosion-proof membrane with a wall body, a sealing ring and a pore plate. When the cap is used for activating high-rate charge and discharge of a battery or the battery is abnormal, the gasket is heated seriously, the capacity of the explosion-proof membrane for sealing the annular pressure relief ring to pass current with the cross section of current is limited seriously, the battery is heated abnormally when the pure electric bus and the like need to be started and the instantaneous large current is generated, the power is cut off or started in advance, and the safety explosion prevention and the combustion prevention of the battery cannot be guaranteed.
For example, the patent number ZL 201020180890.6 discloses an explosion-proof cap of a micro-resistance cylindrical lithium ion battery, which mainly comprises an upper cap, a gasket, an explosion-proof film with a wall body, a sealing ring and a pore plate. When the cap is in an abnormal state of the battery or the battery is activated to charge and discharge, the gasket is heated seriously, the explosion-proof capacity of the explosion-proof film of the closed annular pressure relief ring is extremely unstable, and the explosion-proof film is easy to open in advance due to ultrasonic vibration, stress in all directions and the like in the processes of cleaning, welding and sealing the battery in the processing process of the cap, or the opening pressure is reduced, so that the pressure relief is opened without breaking and power failure of a laser welding spot. When the pressure relief is opened without power failure, the released high-temperature gas easily encounters oxygen and plays a role together with a non-flame-retardant firing medium such as a sealing ring to combust, even at a certain high temperature, the sealing ring can not limit the pore plate to overturn together with the explosion-proof membrane, the fused sealing ring can block the gas outlet of the upper cover cap, and the continuous electrification can lead the internal pressure of the battery to rise infinitely and explode. The closed annularly-installed pressure ring mainly forms a pressure relief opening by means of thinning materials, so that the capability of a cap passing through sectional area current is severely limited, and a battery abnormally generates heat when a large current is needed to start a pure electric bus and the like at the moment, and is powered off or opened in advance.
In addition, when the cap and the steel shell are packaged by the battery, the steel shell and the cap are pressed by a die in the radial direction and the axial direction, the cap is affected by the radial pressure and the axial pressure together, the radial pressure and the axial pressure are matched to deform the sealing ring and the explosion-proof membrane, the sealing ring can cut off the radial passage of the sealing ring through hollowing, so that the pore plate and the explosion-proof membrane are dislocated to cause the scrapping of the battery, but the sealing ring cannot ensure that the explosion-proof membrane is stressed irregularly to cause the superposition or thinning of the closed annular pressure relief ring, so that the nicked superposition can cause infinite opening pressure, and; the nick is thinned, and the pressure relief opening pressure is reduced, so that the battery is opened in advance and scrapped, and the service life is shortened.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, an explosion-proof membrane of a power battery cap cannot be normally opened for pressure relief after being turned over, the internal resistance of the cap is unstable, instantaneous large current cannot be smoothly passed through to meet the requirements of quick charging and use, the large current generates heat seriously, the battery is easy to burn, the service life is short, and when the cap is normally produced and packaged with a steel shell, the explosion-proof membrane of the cap is easy to deform and break, the battery is scrapped due to dislocation and breakage of the explosion-proof membrane and the explosion and combustion of the battery are caused by superposition deformation of the explosion-proof membrane.
The technical scheme of the invention is as follows: the utility model provides a quick charge battery safety block, including the upper cover cap, take the rupture membrane of wall body, orifice plate and interior, the external seal circle, the upper cover cap sets up to be on the rupture membrane up end and compresses tightly and the ultrasonic wave multiple spot welding is in the upper cover cap up end state by wall body incurving, the equipartition is by a plurality of ventholes on the upper cover cap, rupture membrane lower extreme face central point welds the orifice plate, the outer wall of block outer wall and rupture membrane is gone up in the outer seal circle rubber coating parcel, the upper and lower level of external seal circle inwards bend the rubber coating and compress tightly the up end of upper cover cap or rupture membrane wall body and the lower terminal surface of rupture membrane, its characterized in that: the periphery of the central part of the anti-explosion membrane welded pore plate is provided with two sections of arc-shaped pressure relief notches which are not connected on the same circumference and are symmetrically arranged.
Furthermore, the lower edge of the outer sealing ring is bent to form a circular cavity, an inner sealing ring is arranged in the circular cavity, the inner sealing ring is positioned or limited corresponding to the side wall of the circular cavity, a supporting platform is arranged on the lower end face of the inner sealing ring, and the pore plate is positioned or limited and supported on or in the supporting platform.
Furthermore, the supporting platform of the inner sealing ring is thickened, and the periphery of the supporting platform of the inner sealing ring is of a hollow-out or thin-edge structure.
Furthermore, the center of the anti-explosion film protrudes downwards to form a steamed bun filling bulge structure, the arc-shaped pressure relief notch groove is formed in the steamed bun filling bulge structure or the root of the steamed bun filling bulge structure, and the hole plate is connected to the anti-explosion film steamed bun filling bulge structure in a laser electric welding mode.
Further, the lower end face of the pore plate is ultrasonically welded with a transition lug.
Further, the arc-shaped pressure relief notch groove is arranged corresponding to the air hole.
Furthermore, the air outlet is internally provided with a turnover pre-pressure relief buckle connected to the upper cover cap, and the turnover pre-pressure relief buckle corresponds to the arc-shaped pressure relief notch.
Furthermore, a gasket is arranged between the upper cover cap and the explosion-proof membrane, and an inner ring of the gasket corresponds to the arc-shaped pressure relief notch groove.
The invention has the advantages that:
1. the explosion-proof membrane is characterized in that two sections of arc-shaped pressure relief notches which are not connected and are symmetrically arranged on the same circumference are arranged on a whole steamed bun-shaped protruding structure, so that a large current passes through the symmetrical middle unconnected part of the arc-shaped pressure relief notches, the sectional area required by the large current passing material is met, the large current is prevented from instantly passing through a small area to instantly heat up, the pressure transmitted by a die in the radial direction and the axial direction during the packaging of a cap and a steel shell is buffered, the explosion-proof line is prevented from being overlapped or thinned, the safety explosion-proof performance of a battery is improved, and the use requirement of quick charging and quick discharging is met; the inner hole edge of the gasket is completely overturned after the rupture membrane and the pore plate are separated by adopting the overturning on the air outlet of the upper cover cap to press and buckle goods, and the rupture membrane is propped against a rupture membrane pressure relief line, so that the rupture membrane after deformation is propped against the upper cover due to environmental expansion under the environment of extreme high and low temperature to be prevented from being opened normally, and secondary forced puncture of the rupture membrane is carried out to open and relieve pressure.
2. The upper cover cap and the bending part of the explosion-proof membrane wall body are not lower than three points for ultrasonic welding, and the upper cover cap and the explosion-proof membrane are connected into a whole after welding, so that a gap generated by mutual contact is eliminated, and the integral internal resistance is reduced.
3. The outer sealing ring is made of modified materials to ensure sufficient elasticity, strong alkali and strong acid resistance, high temperature resistance and melting capacity, the cap and the steel shell are sealed at normal temperature, enough elasticity cannot seal the space to ensure that the sealing is free from liquid leakage and is not corroded by strong acid and strong alkali to lose elasticity, and the outer sealing ring has certain melting capacity after high temperature.
4. The inner sealing ring and the outer sealing ring are made of flame-retardant materials, so that high-temperature ignition is avoided, the inner ring is not softened at high temperature and does not conduct electricity, the pressure relief is ensured to be normally opened after the battery is normally powered off, explosion and combustion hidden dangers are avoided, and the production and use safety is ensured. The support platform position thickening of support orifice plate on the inner seal circle is strengthened, guarantees simultaneously with the cooperation of last block that orifice plate and rupture membrane break away from totally behind the increase of battery internal pressure, does not follow the rupture membrane and move toward the upper cover direction together. The periphery of the supporting table is in a thin edge or hollow mode, the wing edges or the hollow edges can be deformed by radial force transmitted when the cover cap and the steel shell are packaged, force is not directly transmitted, the pore plate and the explosion-proof membrane are prevented from being dislocated and disconnected in advance, and the safety explosion-proof performance and the anti-combustion performance of the battery are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a schematic structural view of an inner seal ring;
fig. 5 is a schematic structural diagram of the rupture disk of the present invention.
In the figure: the anti-explosion cover comprises an upper cover cap 1, an air hole 2, a turnover prestress pressure relief buckle 3, an anti-explosion membrane 4, a wall body 5, a steamed bun-shaped protrusion structure 6, an arc pressure relief notch 7, an outer sealing ring 9, an orifice plate 10, a transition lug 11, an inner sealing ring 12, a support table 13 and a thin edge 14.
Detailed Description
The invention is further illustrated by the following figures and examples.
FIGS. 1-5 show: a quick-charging battery safety cap comprises an upper cap 1, an explosion-proof membrane 4 with a wall body 5, a pore plate 10, a transition tab 11, an inner sealing ring 12 and an outer sealing ring 9, wherein the upper cap 1 is arranged on the upper end face of the explosion-proof membrane 4 and is in a state of being bent inwards and pressed by the wall body 5 and being connected to the upper end face of the upper cap 1 through ultrasonic multi-point welding, a plurality of air holes 2 are uniformly distributed on the upper cap 1, a turning pre-response pressure relief buckle 3 connected to the upper cap 1 is arranged in each air hole 2, a steamed bun installing bulge structure 6 protrudes from the center of the lower end face of the explosion-proof membrane 4, the steamed bun installing bulge structure 6 is in a platform shape and is connected with the pore plate 10 through multi-point laser spot welding, and two sections of arc-shaped pressure relief grooves 7 which are not connected on the same circumference and are symmetrically arranged corresponding to the turning pre-response pressure relief; the outer sealing ring 9 wraps the outer wall of the upper cover cap 1 and the outer wall of the explosion-proof membrane 4, the upper edge and the lower edge of the outer sealing ring 9 are bent inwards to press the upper end face of the explosion-proof membrane bending wall body 5 and the lower end face of the explosion-proof membrane 4, the lower edge of the outer sealing ring 9 is bent to form a circular cavity, an inner sealing ring 12 is arranged in the circular cavity, the inner sealing ring 12 is positioned or limited corresponding to the side wall of the circular cavity, a supporting table 13 is arranged on the lower end face of the inner sealing ring 12, the orifice plate 10 is positioned or limited and supported on the supporting table or in the supporting table, the supporting table of; the lower end surface of the pore plate 10 is ultrasonically welded with a transition tab 11.
Claims (6)
1. The utility model provides a quick charge battery safety block, including the upper cover cap, take the rupture membrane of wall body, orifice plate and interior, the external seal circle, the upper cover cap sets up to be on the rupture membrane up end and compresses tightly and the ultrasonic wave multiple spot welding is in the upper cover cap up end state by wall body incurving, the equipartition is by a plurality of ventholes on the upper cover cap, rupture membrane lower extreme face central point welds the orifice plate, the outer wall of block outer wall and rupture membrane is gone up in the outer seal circle rubber coating parcel, the upper and lower level of external seal circle inwards bend the rubber coating and compress tightly the up end of upper cover cap or rupture membrane wall body and the lower terminal surface of rupture membrane, its characterized in that: the periphery of the central part of the anti-explosion membrane welded pore plate is provided with two sections of arc-shaped pressure relief notches which are not connected on the same circumference and are symmetrically arranged.
2. The safety cap of the quick-charging battery as claimed in claim 1, characterized in that: the lower edge of the outer sealing ring is bent to form a circular cavity, an inner sealing ring is arranged in the circular cavity, the inner sealing ring is positioned or limited corresponding to the side wall of the circular cavity, a supporting table is arranged on the lower end face of the inner sealing ring, and the pore plate is positioned or limited and supported on or in the supporting table.
3. A safety cap for a quick-charging battery as claimed in claim 2, wherein: the supporting platform of the inner sealing ring is thickened, and the periphery of the supporting platform of the inner sealing ring is of a hollow-out or thin-edge structure.
4. The safety cap of the quick-charging battery as claimed in claim 1, characterized in that: the center lower bulge of the rupture membrane is of a steamed bun filling bulge structure, the arc-shaped pressure relief notch groove is formed in the steamed bun filling bulge structure or the root of the steamed bun filling bulge structure, and the pore plate is connected to the rupture membrane steamed bun filling bulge structure in a laser electric welding mode.
5. The safety cap of the quick-charging battery as claimed in claim 1, characterized in that: and the lower end surface of the pore plate is ultrasonically welded with a transition lug.
6. The safety cap of the quick-charging battery as claimed in claim 1, characterized in that: the arc-shaped pressure relief notch groove is arranged corresponding to the air hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313592.7A CN111146371A (en) | 2018-11-06 | 2018-11-06 | Safety cap of quick-charging battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811313592.7A CN111146371A (en) | 2018-11-06 | 2018-11-06 | Safety cap of quick-charging battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111146371A true CN111146371A (en) | 2020-05-12 |
Family
ID=70516091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811313592.7A Pending CN111146371A (en) | 2018-11-06 | 2018-11-06 | Safety cap of quick-charging battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111146371A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023045672A1 (en) * | 2021-09-24 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | End cover, end cover assembly, battery cell, battery, and electrical device |
-
2018
- 2018-11-06 CN CN201811313592.7A patent/CN111146371A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023045672A1 (en) * | 2021-09-24 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | End cover, end cover assembly, battery cell, battery, and electrical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200512 |
|
| WD01 | Invention patent application deemed withdrawn after publication |