CA2249202C - Cap assembly of battery - Google Patents
Cap assembly of battery Download PDFInfo
- Publication number
- CA2249202C CA2249202C CA002249202A CA2249202A CA2249202C CA 2249202 C CA2249202 C CA 2249202C CA 002249202 A CA002249202 A CA 002249202A CA 2249202 A CA2249202 A CA 2249202A CA 2249202 C CA2249202 C CA 2249202C
- Authority
- CA
- Canada
- Prior art keywords
- battery
- positive
- cap plate
- rivet
- cap
- 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.)
- Expired - Fee Related
Links
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 239000011149 active material Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910003307 Ni-Cd Inorganic materials 0.000 description 1
- 229910018502 Ni—H Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- CJYZTOPVWURGAI-UHFFFAOYSA-N lithium;manganese;manganese(3+);oxygen(2-) Chemical compound [Li+].[O-2].[O-2].[O-2].[O-2].[Mn].[Mn+3] CJYZTOPVWURGAI-UHFFFAOYSA-N 0.000 description 1
- VROAXDSNYPAOBJ-UHFFFAOYSA-N lithium;oxido(oxo)nickel Chemical compound [Li+].[O-][Ni]=O VROAXDSNYPAOBJ-UHFFFAOYSA-N 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 239000007787 solid Substances 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
- H01M50/50—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
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- 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
- 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
-
- 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
-
- 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
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
-
- 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
- H01M50/543—Terminals
-
- 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
- H01M2200/00—Safety devices for primary or secondary batteries
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
Abstract
A cap assembly of a battery, comprising: a cap plate for covering the upper portion of a battery case; a positive terminal installed on the cap plate, insulated from the cap plate; a rivet member having a rivet protrusion, through which a vent hole is formed, inserted through holes formed in the cap plate and the positive terminal for riveting them together, the rivet member electrically connected to the positive terminal; a safety member installed at the lower end of rivet member, blocking the vent hole; and a positive tap fixing member attached to the lower end of the safety member and joined to a positive tap of an electrode assembly in the battery case, wherein the safety member is ruptured and separated from the positive tap fixing member by an internal pressure increase of the battery case.
Description
CA 02249202 l998-lO-0~
CAP ASSEMBLY OF BATTERY
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a battery, and more particularly, to a cap assembly of a battery having an improved structure which can be electrically disconnected from other parts when a safety member is ruptured due to the accidental internal pressure increase of the battery.
CAP ASSEMBLY OF BATTERY
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a battery, and more particularly, to a cap assembly of a battery having an improved structure which can be electrically disconnected from other parts when a safety member is ruptured due to the accidental internal pressure increase of the battery.
2. Description of the Related Art As portable appliances such as video cameras, mobile phones and portable 10 computers become lighter and more versatile, research has been concentrated on batteries to power such appliances. Among conventional batteries, a lithium secondary (i.e. rechargeable) battery has about 3 times the energy density per unit weight of conventional batteries such as a lead acid battery, a Ni-Cd battery, and a Ni-H battery, and can be fast charged. In the lithium secondary battery, lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2 ), lithium manganeseoxide (LiMn2O4) or the like is used as an active material of a positive electrode, and lithium, lithium alloys, a carbon material or the like is used as an active material of a negative electrode. In addition, organic electrolyte or solid polymer electrolyte is used as an electrolyte. In general, the shape of a secondary battery iS cylindrical or rectangular, and the rectangular shape is advantageous to making the portable appliances light and small.
Referring to FIG. 1, a conventional lithium secondary battery of a rectangular shape comprises a battery case 17 for accommodating an electrode core (not shown) which is alternately laminated with positive electrode plates and negative electrode plates having separators therebetween, and a cap assembly 10 attached to the upper portion of the battery case 17.
The cap assembly 10 includes a cap plate 12 for covering the upper portion of the battery case 17, a positive terminal 11 installed on the cap plate 12, and a rivet member 15 inserted through holes formed in the positive terminal 11 and the , CA 02249202 1998-10-0~
cap plate 12, for joining the positive terminal 1 1 to the cap plate 12. A firstinsulating member 13 is interposed between the positive terminal 11 and the cap plate 12, and the cap plate 12 and the rivet member 15 are insulated from each other by a second insulating member 14.
A positive tap 16 which is connected to the positive electrode plates (not shown) is welded to the rivet member 15. In addition, the battery case 17 is connected to a negative tap (not shown).
An electrolyte injection hole 12a for injecting an electrolyte into the battery case 17 is formed at one side of the cap plate 12, and a rupturing portion 12b is formed at the other side of the cap plate 12, to rupture when the internal pressure of the battery is abnormally high.
When the internal pressure of the lithium secondary battery is abnormally high, the rupturing portion 12a of the cap plate 12 ruptures, and gas within thebattery is exhausted. At this time, since the battery is still electrically connected, and has no electrical safety means, the portable appliance in which the battery is used may suffer a subsequent accident such as an electrical shock.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a cap assembly of a battery which can exhaust gas within the battery, and simultaneously break the electrical path of the battery Accordingly, to achieve the above objective, there is provided a cap assembly of a battery, comprising: a cap plate for covering the upper portion of a battery case; a positive terminal installed on the cap plate, insulated from the cap plate; a rivet member having a rivet protrusion, through which a vent hole is formed, inserted through holes formed in the cap plate and the positive terminalfor riveting them together, the rivet member electrically connected to the positive terminal; a safety member installed at the lower end of rivet member, blocking the vent hole; and a positive tap fixing member attached to the lower end of the safety member and joined to a positive tap of an electrode assembly in the battery case, wherein the safety member is ruptured and separated from the positive tap fixingmember by an internal pressure increase of the battery case.
. , ~ . .
CA 02249202 l998-lO-0~
The safety member and the positive tap fixing member are joined to each other by welding.
The safety member is preferably formed in the shape of a hemisphere.
BRIEF DESCRIPTION OF THE DRAWINGS
The above objective and advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings in which:
FIG. 1 is a cut away perspective view illustrating a cap assembly of a conventional lithium battery of a rectangular shape;
FIG. 2 is a exploded perspective view illustrating a cap assembly of a battery according to the present invention; and FIG. 3 is a sectional view illustrating an assembled cap assembly of FIG 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 2 shows a secondary battery which employs a cap assembly according to the present invention. Referring to FIG. 2, a battery case 23 accommodates anelectrode core 22 which is laminated of alternating negative electrode plates 32and positive electrode plates 33, having separators 31 therebetween. The positive electrode plates 33 and the negative electrode plates 32 are connected to a positive tap 22a and a negative tap 22c, respectively. The negative tap 22c is connected to the battery case 23.
An insulating plate 24 is positioned on the electrode core 22, and the positive tap 22a projects through a hole formed in the insulating plate and is attached to a positive tap fixing member 48.
A battery cap assembly 40 according to the present invention is installed on the battery case 23.
Referring to FIGS. 2 and 3, the cap assembly 40 includes a cap plate 43 for covering the upper portion of the battery case 23, and a positive terminal 41 installed on the cap plate 43. A first insulating member 42 is interposed between the positive terminal 41 and the cap plate 43. A gasket 44 having an insulating function is attached to the lower surface of the cap plate 43. An electrolyte CA 02249202 l998-lO-0~
injection hole 43a is formed at the cap plate 43 for injecting an electrolyte containing a lithium salt into the battery case 23.
The cap plate 43, the first insulating member 42, the positive terminal 41 and the gasket 44 are riveted together by a rivet member 46. A rivet protrusion 46b of the rivet member 46 is inserted through holes formed in the cap plate 43,the first insulating member 42, the positive terminal 41 and the gasket 44, for riveting them. A vent hole 46a is formed in the rivet protrusion 46b through therivet member 46, and the vent hole 46a communicates with the inside of the battery case 23 when the battery has been assembled.
The rivet member 46 is insulated from the cap plate 43 by a second insulating member 45 interposed therebetween. As shown in FIGS. 2 and 3, auxiliary metal members 49 may be attached to the sides of the second insulatingmember 45. That is, the auxiliary metal members 49 can be attached to the second insulating member 45 by a projection 49a formed on the auxiliary metal members 49 which fits into a slot 45a formed in the second insulating member 45.The auxiliary metal members 49 serve to securely fix the positive tap fixing member 48.
A safety member 47 is installed at the lower end of rivet member 46 for blocking the vent hole 46a. It is preferable that the circumferential surface of the safety member 47 is welded to the lower end of the rivet member 46 at welding points W2 and W4. The safety member 47 is preferably formed in the shape of a hemisphere.
In addition, the lowest point of the safety member 47 is welded to the positive tap fixing member 48 at a welding point W3. The positive tap fixing member 48 is welded to the auxiliary metal member 49 at welding points W1 and W5.
In the operation of a battery employing the cap assembly as described above, a current flows from the electrode core 22 to the positive terminal 41 via the positive tap 22a, the positive tap fixing member 48, the safety member 47, and the rivet member 46, in sequence.
When the battery operates abnormally and generates gas, the internal pressure of the battery case is raised. Most reasons for the internal pressure CA 02249202 1998-10-0~
increase of a battery are due to internal shock of the battery or a short circuit.
When an excess current flows because of a battery abnormality, organic solvent of the battery is vaporized by exothermic phenomena in the battery, and the internal pressure rises.
When the internal pressure of the battery rises, the safety member 47 is deformed by the high pressure, and is separated from the positive tap fixing member 48. Accordingly, the battery current can not flow. Then, the safety member 47 continues to deform toward the vent hole 46a of the rivet member 46 and finally ruptures. As a result, the inside of the battery case 23 communicates with the vent hole 46a, and the gas in the battery can be exhausted through the vent hole 46a. Therefore, the internal pressure is released.
With the cap assembly according to the present invention, when a high internal pressure ruptures the safety member, the gas in the battery is exhausted, and simultaneously the current flow is blocked. Consequently, the battery is safer.
Referring to FIG. 1, a conventional lithium secondary battery of a rectangular shape comprises a battery case 17 for accommodating an electrode core (not shown) which is alternately laminated with positive electrode plates and negative electrode plates having separators therebetween, and a cap assembly 10 attached to the upper portion of the battery case 17.
The cap assembly 10 includes a cap plate 12 for covering the upper portion of the battery case 17, a positive terminal 11 installed on the cap plate 12, and a rivet member 15 inserted through holes formed in the positive terminal 11 and the , CA 02249202 1998-10-0~
cap plate 12, for joining the positive terminal 1 1 to the cap plate 12. A firstinsulating member 13 is interposed between the positive terminal 11 and the cap plate 12, and the cap plate 12 and the rivet member 15 are insulated from each other by a second insulating member 14.
A positive tap 16 which is connected to the positive electrode plates (not shown) is welded to the rivet member 15. In addition, the battery case 17 is connected to a negative tap (not shown).
An electrolyte injection hole 12a for injecting an electrolyte into the battery case 17 is formed at one side of the cap plate 12, and a rupturing portion 12b is formed at the other side of the cap plate 12, to rupture when the internal pressure of the battery is abnormally high.
When the internal pressure of the lithium secondary battery is abnormally high, the rupturing portion 12a of the cap plate 12 ruptures, and gas within thebattery is exhausted. At this time, since the battery is still electrically connected, and has no electrical safety means, the portable appliance in which the battery is used may suffer a subsequent accident such as an electrical shock.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a cap assembly of a battery which can exhaust gas within the battery, and simultaneously break the electrical path of the battery Accordingly, to achieve the above objective, there is provided a cap assembly of a battery, comprising: a cap plate for covering the upper portion of a battery case; a positive terminal installed on the cap plate, insulated from the cap plate; a rivet member having a rivet protrusion, through which a vent hole is formed, inserted through holes formed in the cap plate and the positive terminalfor riveting them together, the rivet member electrically connected to the positive terminal; a safety member installed at the lower end of rivet member, blocking the vent hole; and a positive tap fixing member attached to the lower end of the safety member and joined to a positive tap of an electrode assembly in the battery case, wherein the safety member is ruptured and separated from the positive tap fixingmember by an internal pressure increase of the battery case.
. , ~ . .
CA 02249202 l998-lO-0~
The safety member and the positive tap fixing member are joined to each other by welding.
The safety member is preferably formed in the shape of a hemisphere.
BRIEF DESCRIPTION OF THE DRAWINGS
The above objective and advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings in which:
FIG. 1 is a cut away perspective view illustrating a cap assembly of a conventional lithium battery of a rectangular shape;
FIG. 2 is a exploded perspective view illustrating a cap assembly of a battery according to the present invention; and FIG. 3 is a sectional view illustrating an assembled cap assembly of FIG 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 2 shows a secondary battery which employs a cap assembly according to the present invention. Referring to FIG. 2, a battery case 23 accommodates anelectrode core 22 which is laminated of alternating negative electrode plates 32and positive electrode plates 33, having separators 31 therebetween. The positive electrode plates 33 and the negative electrode plates 32 are connected to a positive tap 22a and a negative tap 22c, respectively. The negative tap 22c is connected to the battery case 23.
An insulating plate 24 is positioned on the electrode core 22, and the positive tap 22a projects through a hole formed in the insulating plate and is attached to a positive tap fixing member 48.
A battery cap assembly 40 according to the present invention is installed on the battery case 23.
Referring to FIGS. 2 and 3, the cap assembly 40 includes a cap plate 43 for covering the upper portion of the battery case 23, and a positive terminal 41 installed on the cap plate 43. A first insulating member 42 is interposed between the positive terminal 41 and the cap plate 43. A gasket 44 having an insulating function is attached to the lower surface of the cap plate 43. An electrolyte CA 02249202 l998-lO-0~
injection hole 43a is formed at the cap plate 43 for injecting an electrolyte containing a lithium salt into the battery case 23.
The cap plate 43, the first insulating member 42, the positive terminal 41 and the gasket 44 are riveted together by a rivet member 46. A rivet protrusion 46b of the rivet member 46 is inserted through holes formed in the cap plate 43,the first insulating member 42, the positive terminal 41 and the gasket 44, for riveting them. A vent hole 46a is formed in the rivet protrusion 46b through therivet member 46, and the vent hole 46a communicates with the inside of the battery case 23 when the battery has been assembled.
The rivet member 46 is insulated from the cap plate 43 by a second insulating member 45 interposed therebetween. As shown in FIGS. 2 and 3, auxiliary metal members 49 may be attached to the sides of the second insulatingmember 45. That is, the auxiliary metal members 49 can be attached to the second insulating member 45 by a projection 49a formed on the auxiliary metal members 49 which fits into a slot 45a formed in the second insulating member 45.The auxiliary metal members 49 serve to securely fix the positive tap fixing member 48.
A safety member 47 is installed at the lower end of rivet member 46 for blocking the vent hole 46a. It is preferable that the circumferential surface of the safety member 47 is welded to the lower end of the rivet member 46 at welding points W2 and W4. The safety member 47 is preferably formed in the shape of a hemisphere.
In addition, the lowest point of the safety member 47 is welded to the positive tap fixing member 48 at a welding point W3. The positive tap fixing member 48 is welded to the auxiliary metal member 49 at welding points W1 and W5.
In the operation of a battery employing the cap assembly as described above, a current flows from the electrode core 22 to the positive terminal 41 via the positive tap 22a, the positive tap fixing member 48, the safety member 47, and the rivet member 46, in sequence.
When the battery operates abnormally and generates gas, the internal pressure of the battery case is raised. Most reasons for the internal pressure CA 02249202 1998-10-0~
increase of a battery are due to internal shock of the battery or a short circuit.
When an excess current flows because of a battery abnormality, organic solvent of the battery is vaporized by exothermic phenomena in the battery, and the internal pressure rises.
When the internal pressure of the battery rises, the safety member 47 is deformed by the high pressure, and is separated from the positive tap fixing member 48. Accordingly, the battery current can not flow. Then, the safety member 47 continues to deform toward the vent hole 46a of the rivet member 46 and finally ruptures. As a result, the inside of the battery case 23 communicates with the vent hole 46a, and the gas in the battery can be exhausted through the vent hole 46a. Therefore, the internal pressure is released.
With the cap assembly according to the present invention, when a high internal pressure ruptures the safety member, the gas in the battery is exhausted, and simultaneously the current flow is blocked. Consequently, the battery is safer.
Claims (5)
1. A cap assembly of a battery, comprising:
a cap plate for covering the upper portion of a battery case;
a positive terminal installed on the cap plate, insulated from the cap plate;
a rivet member having a rivet protrusion, through which a vent hole is formed, inserted through holes formed in the cap plate and the positive terminalfor riveting them together, the rivet member electrically connected to the positive terminal;
a safety member installed at the lower end of rivet member, blocking the vent hole; and a positive tap fixing member attached to the lower end of the safety member and joined to a positive tap of an electrode assembly in the battery case, wherein the safety member is ruptured and separated from the positive tap fixing member by an internal pressure increase of the battery case.
a cap plate for covering the upper portion of a battery case;
a positive terminal installed on the cap plate, insulated from the cap plate;
a rivet member having a rivet protrusion, through which a vent hole is formed, inserted through holes formed in the cap plate and the positive terminalfor riveting them together, the rivet member electrically connected to the positive terminal;
a safety member installed at the lower end of rivet member, blocking the vent hole; and a positive tap fixing member attached to the lower end of the safety member and joined to a positive tap of an electrode assembly in the battery case, wherein the safety member is ruptured and separated from the positive tap fixing member by an internal pressure increase of the battery case.
2. The cap assembly of a battery as claimed in claim 1, wherein the safety member and the positive tap fixing member are joined to each other by welding.
3. The cap assembly of a battery as claimed in claim 1, wherein the safety member is formed in the shape of a hemisphere.
4. The cap assembly of a battery as claimed in claim 1, wherein the cap assembly further comprises: a first insulating member interposed between the positive terminal and the cap plate; and a second insulating member interposed between the cap plate and the positive tap fixing member.
5. The cap assembly of a battery as claimed in claim 4, wherein auxiliary metal members to which the positive tap fixing member is fixed are attached to the second insulating member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR97-52029 | 1997-10-10 | ||
| KR1019970052029A KR19990031352A (en) | 1997-10-10 | 1997-10-10 | Battery safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2249202A1 CA2249202A1 (en) | 1999-04-10 |
| CA2249202C true CA2249202C (en) | 2000-12-12 |
Family
ID=19522506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002249202A Expired - Fee Related CA2249202C (en) | 1997-10-10 | 1998-10-05 | Cap assembly of battery |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6117586A (en) |
| JP (1) | JP4009019B2 (en) |
| KR (1) | KR19990031352A (en) |
| CN (1) | CN1127770C (en) |
| CA (1) | CA2249202C (en) |
| DE (1) | DE19846263C2 (en) |
| GB (1) | GB2330234B (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020150813A1 (en) * | 1997-11-24 | 2002-10-17 | Un-Sick Park | Secondary battery |
| EP0977290A4 (en) * | 1997-12-18 | 2006-10-04 | Matsushita Electric Industrial Co Ltd | DEVICE FOR CLOSING THE OPENINGS OF A CLOSED BATTERY |
| JP4111621B2 (en) * | 1999-03-17 | 2008-07-02 | 三洋電機株式会社 | Sealed battery, sealing plug for sealed battery, and injection hole sealing method |
| KR100751310B1 (en) * | 2001-09-24 | 2007-08-22 | 삼성에스디아이 주식회사 | Cap assembly and rectangular secondary battery provided with it |
| JP3756096B2 (en) * | 2001-10-02 | 2006-03-15 | Ｎｅｃトーキン栃木株式会社 | Sealed battery |
| KR100884793B1 (en) * | 2002-01-05 | 2009-02-23 | 삼성에스디아이 주식회사 | Safety valve and square type secondary battery provided with the same |
| KR100591425B1 (en) * | 2004-09-09 | 2006-06-21 | 삼성에스디아이 주식회사 | Can type secondary battery |
| CN2840334Y (en) * | 2005-06-17 | 2006-11-22 | 深圳市比克电池有限公司 | Lithium ion battery covering plate, battery case and battery |
| KR100719728B1 (en) * | 2005-12-29 | 2007-05-17 | 삼성에스디아이 주식회사 | Cap Assembly and Secondary Battery Using the Same |
| JP5044933B2 (en) * | 2006-01-17 | 2012-10-10 | パナソニック株式会社 | battery |
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| JP5147206B2 (en) * | 2006-08-11 | 2013-02-20 | 三洋電機株式会社 | Nonaqueous electrolyte secondary battery |
| US8119280B2 (en) * | 2007-06-07 | 2012-02-21 | A123 Systems, Inc. | Cap assembly for a high current capacity energy delivery device |
| CN101772850B (en) * | 2007-06-07 | 2013-03-20 | A123系统公司 | Cover assembly for energy supply device with high current capacity |
| US8236441B2 (en) * | 2007-07-24 | 2012-08-07 | A123 Systems, Inc. | Battery cell design and methods of its construction |
| US9236596B2 (en) * | 2011-06-30 | 2016-01-12 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| JP5867376B2 (en) * | 2012-12-07 | 2016-02-24 | トヨタ自動車株式会社 | Sealed battery |
| KR101666255B1 (en) * | 2013-01-08 | 2016-10-13 | 삼성에스디아이 주식회사 | Rechargeable battery |
| JP6008200B2 (en) * | 2013-05-02 | 2016-10-19 | トヨタ自動車株式会社 | Secondary battery |
| KR101720619B1 (en) * | 2013-10-08 | 2017-03-28 | 삼성에스디아이 주식회사 | Secondary battery |
| JP6270511B2 (en) | 2014-01-30 | 2018-01-31 | トヨタ自動車株式会社 | Secondary battery and method for manufacturing secondary battery |
| KR101483133B1 (en) * | 2014-06-30 | 2015-01-15 | 삼성에스디아이 주식회사 | Rechargeable battery |
| KR20170098225A (en) * | 2014-12-26 | 2017-08-29 | 가부시키가이샤 지에스 유아사 | Power storage element |
| KR102371193B1 (en) | 2015-08-10 | 2022-03-07 | 삼성에스디아이 주식회사 | Secondary Battery |
| JP6962168B2 (en) * | 2017-12-12 | 2021-11-05 | 三洋電機株式会社 | Square secondary battery and its manufacturing method |
| CN110176558B (en) * | 2019-04-09 | 2024-04-19 | 宁德时代新能源科技股份有限公司 | Secondary battery top cap subassembly and secondary battery |
| IT202200001847A1 (en) * | 2022-02-03 | 2023-08-03 | Gd Spa | Battery for energy storage |
| KR20240144974A (en) | 2022-02-03 | 2024-10-04 | 쥐.디 에스.피.에이. | Method for manufacturing a battery for energy storage |
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| US3615868A (en) * | 1970-02-20 | 1971-10-26 | Illinois Tool Works | Battery cap assembly |
| US3915752A (en) * | 1974-05-08 | 1975-10-28 | Illinois Tool Works | Battery cap with flame barrier vent filter |
| US3992226A (en) * | 1975-07-25 | 1976-11-16 | Ultra-Mold Corporation | Anti-explosion cap for storage batteries |
| US4098963A (en) * | 1977-02-09 | 1978-07-04 | The Richardson Company | Vented battery cap |
| US4186247A (en) * | 1977-02-09 | 1980-01-29 | The Richardson Company | Vented battery cap |
| US4562127A (en) * | 1984-03-29 | 1985-12-31 | Domingo Mangone | Battery cap with electrolyte level indicator |
| US4978592A (en) * | 1988-09-20 | 1990-12-18 | Dattilo Donald P | Universal electrolyte level indicator for wet cell batteries |
| US5567539A (en) * | 1994-05-23 | 1996-10-22 | Fuji Photo Film Co., Ltd. | Non-aqueous secondary cell |
| US5532075A (en) * | 1994-07-06 | 1996-07-02 | Alexander Manufacturing Corporation | Small battery cell |
| WO1996001504A1 (en) * | 1994-07-06 | 1996-01-18 | Elmer Hughett | Small battery cell |
| US5609972A (en) * | 1996-03-04 | 1997-03-11 | Polystor Corporation | Cell cap assembly having frangible tab disconnect mechanism |
| KR19990027311A (en) * | 1997-09-29 | 1999-04-15 | 손욱 | 켑 assembly of square battery |
-
1997
- 1997-10-10 KR KR1019970052029A patent/KR19990031352A/en not_active Ceased
-
1998
- 1998-09-18 JP JP26517698A patent/JP4009019B2/en not_active Expired - Lifetime
- 1998-09-28 GB GB9821057A patent/GB2330234B/en not_active Expired - Lifetime
- 1998-10-02 US US09/165,308 patent/US6117586A/en not_active Expired - Lifetime
- 1998-10-05 CA CA002249202A patent/CA2249202C/en not_active Expired - Fee Related
- 1998-10-07 DE DE19846263A patent/DE19846263C2/en not_active Expired - Fee Related
- 1998-10-10 CN CN98124137A patent/CN1127770C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR19990031352A (en) | 1999-05-06 |
| CA2249202A1 (en) | 1999-04-10 |
| GB2330234B (en) | 1999-12-08 |
| CN1214553A (en) | 1999-04-21 |
| CN1127770C (en) | 2003-11-12 |
| JPH11162437A (en) | 1999-06-18 |
| DE19846263C2 (en) | 2001-02-15 |
| GB2330234A (en) | 1999-04-14 |
| GB9821057D0 (en) | 1998-11-18 |
| DE19846263A1 (en) | 1999-04-29 |
| US6117586A (en) | 2000-09-12 |
| JP4009019B2 (en) | 2007-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20151005 |