CN102646547A - Protector for lithium ion battery - Google Patents
Protector for lithium ion battery Download PDFInfo
- Publication number
- CN102646547A CN102646547A CN2012101190697A CN201210119069A CN102646547A CN 102646547 A CN102646547 A CN 102646547A CN 2012101190697 A CN2012101190697 A CN 2012101190697A CN 201210119069 A CN201210119069 A CN 201210119069A CN 102646547 A CN102646547 A CN 102646547A
- Authority
- CN
- China
- Prior art keywords
- thermistor
- lithium ion
- ion battery
- bimetal leaf
- ptc 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.)
- Granted
Links
Images
Abstract
The invention discloses a protector for a lithium ion battery, which comprises a closed flat cavity being composed by a shell, wherein two positive temperature coefficient thermistors PTC1 and PTC2 and a bimetallic strip combination switch are arranged in the cavity. The PTC1 and the bimetallic strip combination switch are connected with each other in series and are connected with the PTC2 in parallel to form a combination body, and two banded metal electrodes respectively penetrate through the shell and are connected with the two ends of the combination body. According to the protector, when a circuit is in an over-current state or in an over-temperature state, the on/off of the combination is realized through the deformation of bimetallic strips, thereby realizing the double protection for over heating and over current of the lithium ion battery.
Description
Technical field
The present invention relates to overheated and over-current protection is used electronic devices and components, be specifically related to the overheated overcurrent duplicate protection of a kind of lithium ion battery device.
Background technology
Lithium rechargeable battery being applied in the middle of the various portable electronics equipment more and more widely comprises digital equipments such as mobile phone, panel computer, notebook computer, game machine, digital camera, GPS, and various portable power tool.It is big that it has a capacity, and the advantage that volume is little is the main flow in current battery market.But lithium rechargeable battery causes that easily battery acutely heats up when abnormal conditions such as run into short circuit, overcharge, if do not have safeguard measure this moment, will blast, serious accident such as burning.So lithium rechargeable battery must force to install excess temperature, overcurrent protective device.
At present, the protection scheme of lithium rechargeable battery employing mainly contains following three kinds: high molecular PTC resettable fuse, Thermal Cutoffs and bimetallic protector.
The high molecular PTC resettable fuse is actually the thermistor with ptc characteristics; When the electric current increase causes that temperature raises in the circuit; Perhaps because the ambient temperature rising; Cause its temperature to be elevated to certain particular temperature value when above, its resistance value changes high resistance state into from low resistance state, thus the metering function of playing.After temperature descended, it can return to low resistance state again.Therefore theoretically, the high molecular PTC resettable fuse can play overcurrent and over-temperature protection effect simultaneously.But owing to receive the restriction of material aspect, its protection temperature surpasses the serviceability temperature of the permission of lithium rechargeable battery often more than 90 ℃ at present.Therefore, the high molecular PTC resettable fuse can only use as overcurrent protection.
The operation principle of Thermal Cutoffs is: when battery temperature surpassed the low-temperature alloy fusing point, the fusing of low-temperature alloy silk was broken off, and causes open circuit.Because this is disposable fuse, is not suitable for the development trend of present maintenance-free battery, is eliminated by market gradually.
The bimetallic protector is to utilize the switching characteristic of bimetal leaf under specified temp, plays the effect of over-temperature protection.Because its switch temperature can accurately be controlled, and can receive publicity day by day in lithium rechargeable battery over-temperature protection field at present from recovering, reusing.Its major defect is to realize accurate overcurrent protection.
Summary of the invention
Technical problem to be solved by this invention provides a kind of lithium rechargeable battery that has overheated overcurrent duplicate protection simultaneously and uses components and parts, to overcome the above-mentioned defective that prior art exists.
The technical scheme of technical solution problem of the present invention is following:
A kind of lithium ion battery protector comprises the airtight flat cavity that is made up of housing, and the thermistor PTC1 and the PTC2 of two positive temperature coefficients arranged in the cavity, and the bimetal leaf unit switch.Wherein thermistor PTC1 and bimetal leaf unit switch are connected in series, and structure after being connected in series and the thermistor PTC2 formation assembly that is connected in parallel, two strip metal electrodes pass airtight flat cavity respectively and be connected with the two ends of above-mentioned assembly.
Said semistor PTC1 is a macromolecular PTC thermistor, and its resistance value is no more than 20m Ω;
Said semistor PTC2 is macromolecular PTC thermistor or ceramic PTC thermistor, preferred macromolecular PTC thermistor;
The resistance value of said PTC2 is greater than the PTC1 resistance value;
Said bimetal leaf unit switch comprises: the spring leaf that has hard contact; One bimetal leaf is arranged below the spring leaf, when ambient temperature arrives certain particular temperature value, bimetal leaf generation deformation; The motion of drive spring leaf causes the hard contact motion that is connected with spring leaf.
The present invention under normal circumstances, the bimetallic unit switch is in closure state, the circuit operate as normal.When circuit generation overcurrent or excess temperature situation, the semistor temperature raises and causes bimetal leaf generation deformation or directly cause bimetal leaf generation deformation, causes the bimetal leaf unit switch to break off; The shunting action of PTC1 stops; Cause that PTC2 is in the high temperature high resistance state, circuit is carried out current-limiting protection, it is in the condition of high temperature simultaneously; Also can continue to make it be in the disconnection lock-out state to the bimetal leaf heating.And then can realize the duplicate protection of overheated overcurrent.
Description of drawings
Fig. 1 is a structural circuit sketch map of the present invention.
Fig. 2 is a structural representation of the present invention, wherein:
1, the strip metal electrode
2, the strip metal electrode
3, thermistor PTC1
4, thermistor PTC2
5, bimetal leaf
6, the metal spring sheet
7, hard contact
8, cavity.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing 1 and accompanying drawing 2.
The present invention includes a pair of strip metal electrode 1 arranged of being in line passes cavity 8 with 2, two strip metal electrodes and is connected with the assembly of inside; The downside electrode of PTC thermistor (PTC1) 3 and PTC thermistor (PTC2) 4 all is electrically connected with strip metal electrode 1; The last lateral electrode of PTC thermistor (PTC2) 4 is electrically connected with strip metal electrode 2; Metal spring sheet 6 one ends are fixed on the strip metal electrode 2 and with it and are electrically connected; Hard contact 7 is positioned at the other end of metal spring sheet 6, and it contacts with the last lateral electrode of PTC thermistor (PTC1) 3 under normal state; Bimetal leaf 5 is positioned at the below of metal spring sheet 6.
PTC thermistor (PTC1) 3 and PTC thermistor (PTC2) 4 are semistor, and the resistance value of PTC2 is greater than the PTC1 resistance value.Wherein, PTC thermistor (PTC1) 3 is a macromolecular PTC thermistor, and its resistance value is no more than 20m Ω, and is maximum normal through electric current 1.5A below the preferred 10 m Ω, action protection electric current 3.0A; PTC thermistor (PTC2) 4 is macromolecular PTC thermistor or ceramic PTC thermistor, preferred macromolecular PTC thermistor, and its resistance value is 200m Ω, and is maximum normal through electric current 0.2A, action protection electric current 0.5A; Bimetal leaf 5 break-off signals are 80 ℃.
Said structure housing and extraction electrode all are flat, are fit to be installed in the lithium rechargeable battery surface, use as excess temperature and overcurrent protective device, have following two kinds of protection situation:
When 1) circuital current is no more than 1.5A, the battery operate as normal.When the lithium rechargeable battery short circuit; Electric current increases suddenly in the circuit, generally surpasses more than the 10A, causes that PTC thermistor (PTC2) 4 is in the high temperature high resistance state; Its heat makes bimetal leaf be bent upwards simultaneously; Cause that metal spring sheet 6 moves upward, drive hard contact 7 motions, thereby realize that the hard contact 7 and the last lateral electrode of PTC thermistor (PTC1) 3 disengage.At this moment, because PTC thermistor (PTC2) 4 is in high resistance state, PTC thermistor (PTC1) 3 breaks off and connecting simultaneously, and whole device is in high resistance state, and battery circuit is realized current-limiting protection.
2) overcharge when lithium rechargeable battery; Battery temperature raises when surpassing 80 ℃; Bimetal leaf is bent upwards, and causes that metal spring sheet 6 moves upward, and drives hard contact 7 motions; Thereby realize that the hard contact 7 and the last lateral electrode of PTC thermistor (PTC1) 3 disengage, make PTC thermistor (PTC1) 3 break off and connect.At this moment, electric current is 1.5A through PTC thermistor (PTC2) 4 all in the circuit, surpasses its action protection electric current 0.5A.Cause that it is in the high temperature high-impedance state, whole device is in high resistance state, and battery circuit is realized current-limiting protection.
Claims (7)
1. lithium ion battery protector; Comprise the airtight flat cavity that constitutes by housing; It is characterized in that: comprise first thermistor, second thermistor and bimetal leaf unit switch in the said cavity; Said first thermistor and bimetal leaf unit switch are connected in series, the structure that is connected in series and said second thermistor formation assembly that is connected in parallel, and two strip metal electrodes are connected with the two ends of said assembly respectively.
2. lithium ion battery protector according to claim 1 is characterized in that, said first thermistor and second thermistor are semistor.
3. lithium ion battery protector according to claim 2 is characterized in that the resistance value of said second thermistor is greater than the resistance value of said first thermistor.
4. lithium ion battery protector according to claim 3 is characterized in that, first thermistor is a macromolecular PTC thermistor, and the resistance value of described first thermistor is no more than 20m Ω.
5. lithium ion battery protector according to claim 3 is characterized in that, first thermistor is a macromolecular PTC thermistor, and the resistance value of described first thermistor is below the 10m Ω.
6. lithium ion battery protector according to claim 2 is characterized in that, said second thermistor is macromolecular PTC thermistor or ceramic PTC thermistor.
7. lithium ion battery protector according to claim 1; It is characterized in that said bimetal leaf unit switch comprises the spring leaf that has hard contact, a bimetal leaf is arranged below the spring leaf; Bimetal leaf generation deformation drives the hard contact motion that is connected with spring leaf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210119069.7A CN102646547B (en) | 2012-04-23 | 2012-04-23 | Protector for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210119069.7A CN102646547B (en) | 2012-04-23 | 2012-04-23 | Protector for lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102646547A true CN102646547A (en) | 2012-08-22 |
| CN102646547B CN102646547B (en) | 2015-07-15 |
Family
ID=46659317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210119069.7A Active CN102646547B (en) | 2012-04-23 | 2012-04-23 | Protector for lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102646547B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9812693B2 (en) | 2015-01-05 | 2017-11-07 | Johnson Controls Technology Company | Separate welding planes for a battery module |
| CN109818111A (en) * | 2019-03-31 | 2019-05-28 | 联想(北京)有限公司 | A kind of battery system and electronic equipment |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1605580A1 (en) * | 2002-11-29 | 2005-12-14 | Matsushita Refrigeration Company | Starting device for single-phase induction motor |
| CN1316708C (en) * | 2001-02-06 | 2007-05-16 | 索尼化学株式会社 | Protection circuit-equipped secondary battery |
| CN202076056U (en) * | 2011-04-02 | 2011-12-14 | 谢维 | External lithium cell protecting PTC (positive temperature coefficient) part |
| CN202549721U (en) * | 2012-04-23 | 2012-11-21 | 东莞市晶品电子科技有限公司 | Lithium ion battery protector |
-
2012
- 2012-04-23 CN CN201210119069.7A patent/CN102646547B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316708C (en) * | 2001-02-06 | 2007-05-16 | 索尼化学株式会社 | Protection circuit-equipped secondary battery |
| EP1605580A1 (en) * | 2002-11-29 | 2005-12-14 | Matsushita Refrigeration Company | Starting device for single-phase induction motor |
| CN202076056U (en) * | 2011-04-02 | 2011-12-14 | 谢维 | External lithium cell protecting PTC (positive temperature coefficient) part |
| CN202549721U (en) * | 2012-04-23 | 2012-11-21 | 东莞市晶品电子科技有限公司 | Lithium ion battery protector |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9812693B2 (en) | 2015-01-05 | 2017-11-07 | Johnson Controls Technology Company | Separate welding planes for a battery module |
| CN109818111A (en) * | 2019-03-31 | 2019-05-28 | 联想(北京)有限公司 | A kind of battery system and electronic equipment |
| CN109818111B (en) * | 2019-03-31 | 2022-07-26 | 联想(北京)有限公司 | Battery system and electronic equipment |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102646547B (en) | 2015-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106663566B (en) | Protect equipment | |
| CN110086144A (en) | Protective device | |
| CN101770896B (en) | Thin-type temperature-sensing action element | |
| CN103457251A (en) | Protective circuit based on PTC thermistor | |
| CN207183396U (en) | Battery | |
| CN102646547B (en) | Protector for lithium ion battery | |
| CN103177835B (en) | A kind of circuit protecting element, protection circuit and electric/electronic | |
| JP2014533423A (en) | High current repetitive fuse | |
| CN202549721U (en) | Lithium ion battery protector | |
| CN203553041U (en) | Miniature bimetallic strip type overheating protector | |
| US20170222426A1 (en) | Surge protection device with an independent chamber comprising a fuse for overcurrent protection | |
| JP7422142B2 (en) | Protectors, battery cells and batteries | |
| CN205428854U (en) | Circuit protection component | |
| CN107221629A (en) | Battery and mobile terminal | |
| CN103943292B (en) | A kind of safe varistor of the hot tripping indication function of band | |
| CN203553884U (en) | A voltage limiting type current surge safety device | |
| CN107516748B (en) | Battery protection device and protection method | |
| CN204189712U (en) | A kind of circuit protection device | |
| CN109326763A (en) | Battery | |
| CN208986655U (en) | A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection | |
| CN209607819U (en) | A kind of battery and electric appliance | |
| CN207993785U (en) | Buckle-type responsive type overload protective device | |
| US11509159B2 (en) | System and method for thermal cutoff protection device control from an external component | |
| CN204144190U (en) | A kind of circuit protection device | |
| CN207853458U (en) | A kind of lightning protection device window type display switching device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 523000, Guangdong, Dongguan City, 1 South Road, No. 1013, Dongguan, Tian An Digital City, B1, building one Applicant after: Dongguan Jingpin Electronics Technology Co., Ltd. Address before: 523000 Guangdong province Dongguan Nancheng District week Xilong Xi Road No. 5, Goldman science and Technology Park of the two science and technology building tenth room 03 Goldman Applicant before: Dongguan Jingpin Electronics Technology Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |