CN112736279A - Button cell with safety device and manufacturing method thereof - Google Patents
Button cell with safety device and manufacturing method thereof Download PDFInfo
- Publication number
- CN112736279A CN112736279A CN202110034183.9A CN202110034183A CN112736279A CN 112736279 A CN112736279 A CN 112736279A CN 202110034183 A CN202110034183 A CN 202110034183A CN 112736279 A CN112736279 A CN 112736279A
- Authority
- CN
- China
- Prior art keywords
- safety device
- welding
- cell
- button cell
- thermistor
- 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
Images
Classifications
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a button cell with a safety device and a manufacturing method thereof, the button cell comprises a cell core, one end of the cell core is provided with a positive electrode lug, the other end of the cell core is provided with a negative electrode lug, one end of the positive electrode lug is arranged on a lower shell, one end of the negative electrode lug is arranged on an upper shell, a containing cavity is formed between the upper shell and the lower shell, electrolyte is arranged in the containing cavity, a sealing ring is also arranged between the upper shell and the lower shell, the positive electrode lug or the negative electrode lug is provided with the safety device, the safety device is welded with the positive electrode lug or the negative electrode lug to form a first welding spot, the outer side of the first welding spot is provided with insulating protective glue, the safety device is arranged in the cell core, the cell core and the safety device are both soaked in the electrolyte, the safety device is arranged in the cell core and becomes, the safety performance of the button cell can be improved, the button cell is convenient for customers to use, and safety tests can be passed.
Description
Technical Field
The invention relates to the technical field of lithium ion button batteries, in particular to a button battery with a safety device and a manufacturing method thereof.
Background
Lithium ion batteries have the advantages of high voltage, high specific energy, high cycle frequency, long storage time and the like, are widely applied to portable electronic devices such as mobile phones, digital video cameras and portable computers, and are also widely applied to large and medium-sized electric devices such as electric automobiles, electric bicycles, electric tools and the like, so that the requirements on the electrical performance and the safety performance of the lithium ion batteries are higher and higher, and polymer lithium ion batteries are favored with excellent performance and excellent safety performance.
However, in the practical use process, the safety problem of the battery still exists, and particularly, under the condition that the external protection circuit PCM fails, when large current charge and discharge occurs or an external circuit is directly short-circuited, the internal part of the battery cell is violently heated due to the instantaneous large current, and safety accidents such as fire, even explosion and the like occur.
In view of the above problems, a tab for a lithium ion battery equipped with a thermistor has been developed, however, the thermistor of the tab is generally disposed outside the battery cell. During the safety test, the thermistor arranged outside is usually cut off as an auxiliary safety element of the battery core, which results in the test failure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a button cell with a safety device and a manufacturing method thereof, wherein the safety device is arranged in a cell and becomes an integral part of the cell, so that the safety performance of the button cell can be improved, the button cell is convenient for customers to use, and safety tests can be passed.
In order to achieve the purpose, the invention provides a button cell with a safety device, which comprises a cell, wherein one end of the cell is provided with a positive tab, the other end of the cell is provided with a negative tab, one end of the positive tab is arranged on a lower shell, one end of the negative tab is arranged on an upper shell, a containing cavity is formed between the upper shell and the lower shell, electrolyte is arranged in the containing cavity, and a sealing ring is also arranged between the upper shell and the lower shell.
Preferably, the safety device is a thermistor or an overcurrent resistor.
Preferably, the thermistor or the overcurrent resistor is an embedded rod thermistor or an overcurrent resistor.
Preferably, the diameter of the thermistor or the overcurrent resistor is between 0.5mm and 4.0mm, and the height of the thermistor or the overcurrent resistor is between 2.0 mm and 6.0 mm.
Preferably, one end of the safety device is fixed on the upper shell or the lower shell by welding, and internal or external welding is adopted.
Preferably, the welding method is laser or resistance welding.
The invention also provides a manufacturing method for manufacturing the button cell with the safety device, which comprises the following steps:
step S1, the battery cell is manufactured in a winding mode, and the center of the wound battery cell is provided with a hollow through hole with the diameter of more than 0.8 mm;
step S2, the safety device is a rod-shaped PTC thermistor, the lower end of the PTC thermistor is connected with the negative pole lug of the battery cell in a laser or resistance welding mode, and then the PTC thermistor is inserted into the hollow through hole of the winding battery cell;
step S3, adhering insulation protection glue to the first welding spot formed after welding;
step S4, welding the positive lug to the lower shell in a laser or resistance welding mode;
step S5, injecting electrolyte between the upper shell and the lower shell, installing the sealing ring between the upper shell and the lower shell and completing sealing;
and step S6, fixedly connecting one end of the PTC thermistor with the upper shell through external welding to form a second welding point, wherein the specific welding mode is resistance welding.
Compared with the prior art, the invention has the beneficial effects that:
when the button cell is used, when an external circuit is normal or the internal temperature of the cell is normal, the resistance value of the safety device is very small and can be ignored; when the internal temperature of external circuit takes place the short circuit or electric core is too high, safety device's resistance value will sharply increase, cuts off the inside current loop of electric core, prevents that the inside heavy current that takes place of electric core from charging or discharging to avoid electric core overheated, reach the effect of protection electric core, improve the security that electric core heavy current charges, discharges and external circuit short circuit simultaneously, still make things convenient for the customer to use, can pass through the ann rule test again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a button cell with a safety device according to the present invention.
The figure includes:
1-battery core, 2-positive tab, 3-negative tab, 4-safety device, 5-first welding point, 6-insulation protective glue, 7-upper shell, 8-lower shell, 9-electrolyte, 10-sealing ring and 11-second welding point.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Example one
Referring to fig. 1, the invention provides a button cell with a safety device, which includes a cell 1, wherein one end of the cell 1 is provided with a positive tab 2, the other end of the cell 1 is provided with a negative tab 3, and the positive tab 2 or the negative tab 3 is provided with a safety device 4.
Further, if the safety device 4 is mounted on the positive tab 2, one end of the positive tab 2 is connected to the battery cell 1, the other end of the positive tab is connected to the safety device 4, and the other end of the safety device 4 is fixedly connected to the lower shell 8 by welding to form a second welding spot 11; similarly, if safety device 4 is installed on negative pole ear 3, electricity core 1 is connected to 3 one ends of negative pole ear, and safety device 4 is connected to the other end, the safety device 4 other end passes through welded fastening with epitheca 7 and is connected and form second solder joint 11.
The safety device 4 is arranged inside the battery core 1 and is an integral component of the battery core 1, and further, the safety device 4 is a thermistor or an overcurrent resistor, when the button cell is used, and when an external circuit is normal or the internal temperature of the battery core 1 is normal, the resistance value of the safety device 4 is very small and can be ignored; when the external circuit takes place the short circuit or the inside high temperature of electricity core 1, safety device 4's resistance will sharply increase, cut off the current loop inside electricity core 1, prevent that 1 inside of electricity core from taking place heavy current and charging or discharging to avoid 1 overheated of electricity core, reach the effect of protection electricity core 1, improve the security of 1 heavy current of electricity core charging, discharging and external circuit short circuit simultaneously, still make things convenient for the customer to use, can pass through the safety standard test again.
2 one ends of positive electrode lug are installed on inferior valve 8, 3 one ends of negative electrode lug are installed on epitheca 7, sealing washer 10 has still been installed between epitheca 7 and inferior valve 8, it holds the chamber to form one between epitheca 7 and the inferior valve 8, it has installed electrolyte 9 to hold intracavity portion, electric core 1 and safety device 4 all soak inside electrolyte 9, safety device 4 has become an indivisible component of electric core 1, does not belong to the accessory component of electric core 1, under the condition of not destroying electric core 1, can't get rid of safety device 4 or take out, can directly pass through the ann rule test.
Furthermore, the thermistor or the overcurrent resistor is an embedded rod thermistor or an overcurrent resistor, and can be directly inserted into the battery cell 1, and the diameter of the thermistor or the overcurrent resistor is 0.5mm-4.0mm, and the height of the thermistor or the overcurrent resistor is 2.0-6.0 mm.
Furthermore, the thermistor is a PTC thermistor, the room temperature resistance of the PTC thermistor is 3-20 m omega, and the resistance value at 85 ℃ is 10-2500 omega.
Example two
Referring to fig. 1, a second embodiment of the present invention provides a method for manufacturing a button cell with a safety device according to the first embodiment, including the following steps:
step S1, the battery cell 1 is manufactured in a winding mode, and the center of the wound battery cell 1 is provided with a hollow through hole with the diameter of more than 0.8 mm;
step S2, the safety device 4 is a rod-shaped PTC thermistor, the lower end of the PTC thermistor is connected with the negative electrode tab 3 of the battery cell 1 in a laser or resistance welding mode, and then the PTC thermistor is inserted into the hollow through hole of the wound battery cell 1;
step S3, adhering insulating protective glue 6 to the first welding spot 5 formed after welding;
step S4, welding the positive tab 2 on the lower shell 8 by laser or resistance welding;
step S5, injecting electrolyte 9 between the upper case 7 and the lower case 8, and installing the seal ring 10 between the upper case 7 and the lower case 8 to complete sealing;
and step S6, fixedly connecting one end of the PTC thermistor with the upper shell 7 through external welding to form a second welding point 11, wherein the specific welding mode is resistance welding.
The second embodiment is only a method for manufacturing the button cell with the safety device in the first embodiment, but not all methods, for example: the battery core 1 can also be manufactured in a lamination mode, the safety device 4 can also be in other shapes, and the welding method can also be a laser welding mode.
The manufacturing method is simple to operate, greatly improves the manufacturing efficiency of the button cell and improves the production quality of the button cell.
In conclusion, the beneficial effects of the invention are as follows:
the positive electrode tab 2 or the negative electrode tab 3 is provided with the safety device 4, the safety device 4 is arranged inside the battery cell 1 and becomes an integral part of the battery cell 1, and when the button cell is used, when an external circuit is normal or the internal temperature of the battery cell 1 is normal, the resistance value of the safety device 4 is very small and can be ignored; when the external circuit takes place the short circuit or the inside high temperature of electricity core 1, safety device 4's resistance will sharply increase, cut off the current loop inside electricity core 1, prevent that 1 inside of electricity core from taking place heavy current and charging or discharging to avoid 1 overheated of electricity core, reach the effect of protection electricity core 1, improve the security of 1 heavy current of electricity core charging, discharging and external circuit short circuit simultaneously, still make things convenient for the customer to use, can pass through the safety standard test again.
Claims (7)
1. A button cell with a safety device comprises a cell (1), wherein a positive tab (2) is installed at one end of the cell (1), a negative tab (3) is installed at the other end of the cell, one end of the positive tab (2) is installed on a lower shell (8), one end of the negative tab (3) is installed on an upper shell (7), a containing cavity is formed between the upper shell (7) and the lower shell (8), electrolyte (9) is installed inside the containing cavity, a sealing ring (10) is also installed between the upper shell (7) and the lower shell (8), the button cell is characterized in that the safety device (4) is installed on the positive tab (2) or the negative tab (3), the safety device (4) is connected with the positive tab (2) or the negative tab (3) in a welding manner to form a first welding spot (5), and insulating protective glue (6) is installed on the outer side of the first welding spot (5), the safety device (4) is arranged in the battery cell (1), and the battery cell (1) and the safety device (4) are soaked in the electrolyte (9).
2. Button cell battery with safety device according to claim 1, characterized by the fact that the safety device (4) is a thermistor or an overcurrent resistor.
3. The button cell with safety device according to claim 2, wherein the thermistor or over-current resistor is an embedded rod thermistor or over-current resistor.
4. A button cell battery with safety device according to claim 3, characterized in that the thermistor or the over-current resistor has a diameter of 0.5-4.0 mm and a height of 2.0-6.0 mm.
5. Button cell battery with safety device according to claim 1, characterized in that the safety device (4) is fixed at one end to the upper (7) or lower (8) case by welding, either internal or external.
6. The button cell with the safety device according to claim 5, wherein the welding is laser or resistance welding.
7. A method for manufacturing a button cell with a safety device according to any one of claims 1 to 6, comprising the following steps:
step S1, the battery cell (1) is manufactured in a winding mode, and a hollow through hole with the diameter of more than 0.8mm is formed in the center of the wound battery cell (1);
step S2, the safety device (4) is a rod-shaped PTC thermistor, the lower end of the PTC thermistor is connected with the negative electrode lug (3) of the battery cell (1) in a laser or resistance welding mode, and then the PTC thermistor is inserted into the hollow through hole of the wound battery cell (1);
step S3, adhering insulation protection glue (6) to the first welding spot (5) formed after welding;
step S4, welding the positive lug (2) on the lower shell (8) in a laser or resistance welding mode;
step S5, injecting electrolyte (9) between the upper shell (7) and the lower shell (8), installing the sealing ring (10) between the upper shell (7) and the lower shell (8) and completing sealing;
and step S6, fixedly connecting one end of the PTC thermistor with the upper shell (7) through external welding to form a second welding point (11), wherein the specific welding mode is resistance welding.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034183.9A CN112736279A (en) | 2021-01-12 | 2021-01-12 | Button cell with safety device and manufacturing method thereof |
| PCT/CN2022/071378 WO2022152126A1 (en) | 2021-01-12 | 2022-01-11 | Button cell having safety device and manufacturing method for button cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034183.9A CN112736279A (en) | 2021-01-12 | 2021-01-12 | Button cell with safety device and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112736279A true CN112736279A (en) | 2021-04-30 |
Family
ID=75590592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110034183.9A Pending CN112736279A (en) | 2021-01-12 | 2021-01-12 | Button cell with safety device and manufacturing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112736279A (en) |
| WO (1) | WO2022152126A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022152126A1 (en) * | 2021-01-12 | 2022-07-21 | 广东维都利新能源有限公司 | Button cell having safety device and manufacturing method for button cell |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05325943A (en) * | 1992-05-25 | 1993-12-10 | Nippon Telegr & Teleph Corp <Ntt> | Cylindrical secondary battery |
| JP2002110137A (en) * | 2000-09-29 | 2002-04-12 | Nec Mobile Energy Kk | Sealed battery |
| JP2002324542A (en) * | 2001-04-23 | 2002-11-08 | Sony Corp | Thin battery |
| JP2003217596A (en) * | 2002-01-21 | 2003-07-31 | Tookan:Kk | Alkaline dry element cell |
| CN202633427U (en) * | 2012-02-06 | 2012-12-26 | 合肥国轩高科动力能源有限公司 | Self-protection device for square lithium ion secondary battery |
| US20130136964A1 (en) * | 2011-11-30 | 2013-05-30 | Johnson Controls Technology Company | Electrochemical cell having a safety device |
| CN203674303U (en) * | 2013-11-22 | 2014-06-25 | 深圳市迪凯特电池科技有限公司 | Security structure for lithium ion battery |
| CN211629210U (en) * | 2020-05-11 | 2020-10-02 | 福建南平延平区南孚新能源科技有限公司 | Button cell without welding trace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210224214U (en) * | 2019-08-24 | 2020-03-31 | 重庆市紫建电子有限公司 | Winding type button battery with insulating needle or metal needle electric core |
| CN112736279A (en) * | 2021-01-12 | 2021-04-30 | 广东维都利新能源有限公司 | Button cell with safety device and manufacturing method thereof |
-
2021
- 2021-01-12 CN CN202110034183.9A patent/CN112736279A/en active Pending
-
2022
- 2022-01-11 WO PCT/CN2022/071378 patent/WO2022152126A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05325943A (en) * | 1992-05-25 | 1993-12-10 | Nippon Telegr & Teleph Corp <Ntt> | Cylindrical secondary battery |
| JP2002110137A (en) * | 2000-09-29 | 2002-04-12 | Nec Mobile Energy Kk | Sealed battery |
| JP2002324542A (en) * | 2001-04-23 | 2002-11-08 | Sony Corp | Thin battery |
| JP2003217596A (en) * | 2002-01-21 | 2003-07-31 | Tookan:Kk | Alkaline dry element cell |
| US20130136964A1 (en) * | 2011-11-30 | 2013-05-30 | Johnson Controls Technology Company | Electrochemical cell having a safety device |
| CN202633427U (en) * | 2012-02-06 | 2012-12-26 | 合肥国轩高科动力能源有限公司 | Self-protection device for square lithium ion secondary battery |
| CN203674303U (en) * | 2013-11-22 | 2014-06-25 | 深圳市迪凯特电池科技有限公司 | Security structure for lithium ion battery |
| CN211629210U (en) * | 2020-05-11 | 2020-10-02 | 福建南平延平区南孚新能源科技有限公司 | Button cell without welding trace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022152126A1 (en) * | 2021-01-12 | 2022-07-21 | 广东维都利新能源有限公司 | Button cell having safety device and manufacturing method for button cell |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022152126A1 (en) | 2022-07-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5376467A (en) | Organic electrolyte battery | |
| KR100890178B1 (en) | High Capacity Lithium Ion Secondary Battery with Metal Casing | |
| CN100483795C (en) | Rechargeable battery | |
| US20010049054A1 (en) | Lithium secondary cell and assembly thereof | |
| KR100477752B1 (en) | Protector and lithium secondary battery having the same | |
| CN100511811C (en) | Secondary battery | |
| JP2011210717A (en) | Secondary battery | |
| JP2006049312A (en) | Can type secondary cell | |
| CN202586297U (en) | Overvoltage-protection Li-ion battery charger protector | |
| EP3361528B1 (en) | Power battery and cap structure of the power battery | |
| JP2011258569A (en) | Secondary battery and method of manufacturing the same | |
| CN211208560U (en) | Battery, battery module, battery pack and electric vehicle | |
| JP2004273139A (en) | Lithium secondary battery | |
| KR100662174B1 (en) | Nonaqueous electrolyte secondary battery | |
| CN102544397B (en) | A kind of lithium rechargeable battery | |
| CN112736279A (en) | Button cell with safety device and manufacturing method thereof | |
| CN204946948U (en) | A kind of lithium ion battery safe cap with fuse | |
| JP2001313078A (en) | Sealed type non-aqueous secondary battery and battery pack | |
| CN216488409U (en) | Secondary cell is with preventing short circuit utmost point ear, electrode sheet and secondary cell | |
| KR20120065776A (en) | Secondary battery including layered welding zone having ptc-characteristics and manufacturing method thereof | |
| CN214254673U (en) | Battery module capable of preventing electrochemical corrosion | |
| CN209747629U (en) | Compound utmost point ear subassembly, soft packet of power battery and vehicle | |
| CN201946699U (en) | A lithium ion secondary battery | |
| KR100457627B1 (en) | Secondary battery with non-weldindg type bottom plate | |
| KR100490546B1 (en) | Secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |