CN201601478U - Protective circuit of soft-packaged lithium batteries - Google Patents
Protective circuit of soft-packaged lithium batteries Download PDFInfo
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- CN201601478U CN201601478U CN2009202622850U CN200920262285U CN201601478U CN 201601478 U CN201601478 U CN 201601478U CN 2009202622850 U CN2009202622850 U CN 2009202622850U CN 200920262285 U CN200920262285 U CN 200920262285U CN 201601478 U CN201601478 U CN 201601478U
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Abstract
The utility model discloses a protective circuit of soft-packaged lithium batteries, which comprises a battery protection chip, and a first battery and a second battery which are connected in series, a charge control MOS tube, a discharge control MOS tube, and an overcharge protection branched circuit. The overcharge protection branched circuit is formed by a membrane switch S1, a third resistor, a fourth resistor, a triode T1 and a three-terminal fuse F1. The membrane switch S1 is arranged between the first battery BAT1 and the second battery BAT2. The membrane switch S1 is closed by bulging extrusion of the battery so as to switch on the triode T1, consequential continuous heating of an inner resistor of the three-terminal fuse F1 blows the fuse, and a negative pole of a battery pack is cut off from an external circuit. The protective circuit is capable of timely cutting off a battery charge loop in case of battery bulging, stopping continuous charging of a bulging battery, and realizing further protection of the batteries.
Description
Technical field
The utility model belongs to the lithium battery protection circuit field, relates to a kind of flexible package type lithium battery protection circuit, is mainly used in EPC (miniature notebook), EBook (e-book), fields such as digital equipment.。
Background technology
Along with the technology of lithium battery is constantly ripe, the various lithium batteries of adopting flexible packing material are applied to the numerous areas of consumer electronics product increasingly extensively, and flexible-packed battery is compared conventional batteries and had many advantages, and battery is more frivolous, and volume is littler, and energy is than higher.In case but its shortcoming be when charging li-ion cell protection IC lost efficacy; reaction appears overcharging in the electricity core; the phenomenon that will occur electric core blow-up so; if losing continuation charging under the situation of protection this moment; the bulging phenomenon of electricity core can be more and more serious, when the air pressure external packing gas leakage of will breaking that acquires a certain degree, owing to li-ion chemistry is extremely active; run into air and just can acutely burn, serious harm consumer's life safety.
Fig. 1 is the utility model background technology circuit diagram, and this background technology is the protective circuit schematic diagram of two joint lithium battery tandem compounds, can accomplish to overcharge overdischarge, the protective effect of load overcurrent and positive and negative electrode short circuit to two joint lithium batteries.A kind of two series lithium battery circuit such as Fig. 1, by IC1[battery protection chip], R1, R2, R3, C1, devices such as C2, Q1 form, IC1 finishes the voltage detecting of every joint lithium battery BAT1, BAT2 by R1, R2, wherein R1 and C2 provide power supply for IC1, and provide BAT2 voltage detecting loop for IC1; R2, C1 provide BAT1 voltage detecting loop for IC1; The electric current formed voltage drop that R3 resistance utilizes the metal-oxide-semiconductor internal resistance to produce when discharging and recharging comes for providing IC1 to detect whether load transships and the arbitration functions of positive and negative whether short circuit; Q1 is the N-channel MOS pipe of a built-in two-way opposition serial connection, as the electronic switch function, IC1 control is by C0, the D0 two sub-terminal control Q1 on-off function with realization charge and discharge loop, when just often using herein, D0, C0 are high level, and Q1 two-way MOS is in complete conducting state; If overvoltage condition appears in electric core, then C0 terminal output LOW voltage turn-offs charge circuit; If under-voltage condition appears in electric core, then D0 terminal output LOW voltage turn-offs discharge loop.
The electricity core occurs under the situation of blow-up, and electric core reality can not used, if continue to use, will produce the serious consequence of gas leakage burning, serious threat consumer's personal safety.Therefore, be necessary existing battery protecting circuit is further improved.
The utility model content
The utility model wants the technical solution problem to provide a kind of flexible package type lithium battery protection circuit, and this circuit can in time cut off the battery charge loop when bulging appears in battery, forbids the battery of bulging is continued charging, realizes the further protection to battery.
The utility model is to solve the problems of the technologies described above the technical scheme that is adopted to be:
A kind of flexible package type lithium battery protection circuit comprises battery protection chip, first battery that is serially connected and second battery, charging control metal-oxide-semiconductor, discharge control metal-oxide-semiconductor; This flexible package type lithium battery protection circuit has 2 to external terminal EB+ end and EB-end; The EB+ end joins with second anode; The positive pole of the negative pole of second battery and first battery joins; First battery and second battery connect the vdd terminal and the VC end of battery protection chip respectively by rc filter circuit; The VM end of battery protection chip joins by first resistance and EB-end; The D utmost point butt joint of charging control metal-oxide-semiconductor and discharge control metal-oxide-semiconductor; The G utmost point of discharge control metal-oxide-semiconductor connects the discharge control end of battery protection chip; The S utmost point of charging control metal-oxide-semiconductor connects the EB-end; The charging control end of the G termination battery protection chip of charging control metal-oxide-semiconductor;
It is characterized in that, also comprise the additives for overcharge protection branch road;
Described additives for overcharge protection props up route thin film switch, the 3rd resistance, the 4th resistance, triode and three end fuses and forms; Described thin film switch is arranged between first battery and second battery;
One end of thin film switch connects the EB+ end by the 3rd resistance; The base stage of another termination triode of thin film switch; The 4th resistance is connected between the negative pole of the base stage of triode and first battery;
The negative pole of first termination, first battery of three end fuses; Second termination of three end fuses is crossed the emitter of triode; The S utmost point of the 3rd termination discharge control metal-oxide-semiconductor of three end fuses;
The collector electrode of triode connects the EB+ end.
Described battery protection chip is the S8242 chip.
The beneficial effects of the utility model:
The utility model adopts thin film switch detection battery whether bulging takes place, and when detecting the battery bulging, by additives for overcharge protection circuitry cuts charge circuit, effectively protects the safety of battery.The core of additives for overcharge protection circuit is that a triode is controlled three end fuses, and the utility model has been added one deck protection on the basis of original protective circuit, therefore, adopts flexible package type lithium battery protection circuit of the present utility model, and fail safe is higher.
Description of drawings
Fig. 1 is the circuit diagram of existing flexible package type lithium battery protection circuit;
Fig. 2 is the circuit diagram of flexible package type lithium battery protection circuit of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
As Fig. 2, a kind of flexible package type lithium battery protection circuit comprises battery protection chip [model is S8242], the first battery BAT1 that is serially connected and the second battery BAT2, charging control metal-oxide-semiconductor, discharge control metal-oxide-semiconductor; This flexible package type lithium battery protection circuit has 2 to external terminal EB+ end and EB-end; The EB+ end joins with second anode; The positive pole of the negative pole of second battery and first battery joins; First battery and second battery connect the vdd terminal and the VC end of battery protection chip respectively by rc filter circuit [being respectively R1, C1 and R2 and C2]; The VM end of battery protection chip joins by first resistance R 3 and EB-end; The D utmost point butt joint of charging control metal-oxide-semiconductor and discharge control metal-oxide-semiconductor; The G utmost point of discharge control metal-oxide-semiconductor meets the discharge control end D0 of battery protection chip; The S utmost point of charging control metal-oxide-semiconductor connects the EB-end; The charging control end C0 of the G termination battery protection chip of charging control metal-oxide-semiconductor;
It is characterized in that, also comprise the additives for overcharge protection branch road;
Described additives for overcharge protection props up route thin film switch S1, the 3rd resistance R 4, the 4th resistance R 5, triode T1 and three end fuse F1 and forms; Described thin film switch S1 is arranged between the first battery BAT1 and the second battery BAT2;
One end of thin film switch connects the EB+ end by the 3rd resistance; The base stage of another termination triode of thin film switch; The 4th resistance is connected between the negative pole of the base stage of triode and first battery;
The negative pole of first termination, first battery of three end fuses; Second termination of three end fuses is crossed the emitter of triode; The S utmost point of the 3rd termination discharge control metal-oxide-semiconductor of three end fuses;
The collector electrode of triode connects the EB+ end.
This circuit is improved on the basis of the circuit structure of Fig. 1; Triode T1 is the NPN type, when specifically using, with thin film switch S1 place two the joint soft-package batteries the centre, the overlapping packing of two batteries is combined.
The operation principle of this circuit is as follows: when thin film switch S1 does not also have blow-up at battery, be in open mode always, when in case any batteries has gone out blow-up, thin film switch S1 will be subjected to the blow-up extruding of battery, two pole pieces of thin film switch S1 will be closed, and triode T1 makes the voltage of EB+ be added on the heating resistor of three end fuse F1 inside because of base stage obtains the voltage conducting, by the persistent fever of three end fuse F1 internal resistances, and then three end fuse F1 are fused fully; The negative pole and the external circuit of power brick are cut off, thereby make battery can not continue charging again.Battery just can not continue to worsen after little blow-up yet, protects the safety of battery effectively.
This practicality improves new-type circuit by expanded application, also can extend to the error protection effect of the flexible packaging lithium battery of more string numbers.
Claims (2)
1. a flexible package type lithium battery protection circuit comprises battery protection chip, first battery that is serially connected and second battery, charging control metal-oxide-semiconductor, discharge control metal-oxide-semiconductor; This flexible package type lithium battery protection circuit has 2 to external terminal EB+ end and EB-end; The EB+ end joins with second anode; The positive pole of the negative pole of second battery and first battery joins; First battery and second battery connect the vdd terminal and the VC end of battery protection chip respectively by rc filter circuit; The VM end of battery protection chip joins by first resistance and EB-end; The D utmost point butt joint of charging control metal-oxide-semiconductor and discharge control metal-oxide-semiconductor; The G utmost point of discharge control metal-oxide-semiconductor connects the discharge control end of battery protection chip; The S utmost point of charging control metal-oxide-semiconductor connects the EB-end; The charging control end of the G termination battery protection chip of charging control metal-oxide-semiconductor;
It is characterized in that, also comprise the additives for overcharge protection branch road;
Described additives for overcharge protection props up route thin film switch, the 3rd resistance, the 4th resistance, triode and three end fuses and forms; Described thin film switch is arranged between first battery and second battery;
One end of thin film switch connects the EB+ end by the 3rd resistance; The base stage of another termination triode of thin film switch; The 4th resistance is connected between the negative pole of the base stage of triode and first battery;
The negative pole of first termination, first battery of three end fuses; Second termination of three end fuses is crossed the emitter of triode; The S utmost point of the 3rd termination discharge control metal-oxide-semiconductor of three end fuses;
The collector electrode of triode connects the EB+ end.
2. flexible package type lithium battery protection circuit according to claim 1 is characterized in that described battery protection chip is the S8242 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202622850U CN201601478U (en) | 2009-12-31 | 2009-12-31 | Protective circuit of soft-packaged lithium batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202622850U CN201601478U (en) | 2009-12-31 | 2009-12-31 | Protective circuit of soft-packaged lithium batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201601478U true CN201601478U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202622850U Expired - Fee Related CN201601478U (en) | 2009-12-31 | 2009-12-31 | Protective circuit of soft-packaged lithium batteries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201601478U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231516A (en) * | 2011-07-11 | 2011-11-02 | 深圳市量能科技有限公司 | Battery protection board, power battery and power battery pack |
| CN103107521A (en) * | 2013-02-28 | 2013-05-15 | 百顺松涛（天津）动力电池科技发展有限公司 | Multi-string lithium battery set protective board |
| CN112165076A (en) * | 2020-10-22 | 2021-01-01 | 加森电子科技技术(江苏盐城)有限公司 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method |
| CN115954987A (en) * | 2023-02-03 | 2023-04-11 | 深圳市凌鑫电子有限公司 | Lithium battery charging secondary protection circuit |
-
2009
- 2009-12-31 CN CN2009202622850U patent/CN201601478U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231516A (en) * | 2011-07-11 | 2011-11-02 | 深圳市量能科技有限公司 | Battery protection board, power battery and power battery pack |
| CN102231516B (en) * | 2011-07-11 | 2013-07-10 | 深圳市量能科技有限公司 | Battery protection board, power battery and power battery pack |
| CN103107521A (en) * | 2013-02-28 | 2013-05-15 | 百顺松涛（天津）动力电池科技发展有限公司 | Multi-string lithium battery set protective board |
| CN103107521B (en) * | 2013-02-28 | 2016-04-06 | 百顺松涛（天津）动力电池科技发展有限公司 | A kind of multi-series lithium battery pack protection board |
| CN112165076A (en) * | 2020-10-22 | 2021-01-01 | 加森电子科技技术(江苏盐城)有限公司 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method |
| CN115954987A (en) * | 2023-02-03 | 2023-04-11 | 深圳市凌鑫电子有限公司 | Lithium battery charging secondary protection circuit |
| CN115954987B (en) * | 2023-02-03 | 2023-11-03 | 深圳市凌鑫电子有限公司 | Secondary protection circuit for lithium battery charging |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Shenzhen LTW Electronic Technology Co., Ltd. Document name: Notification to Go Through Formalities Rectification of Restoration of Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20131231 |
|
| EXPY | Termination of patent right or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Shenzhen LTW Electronic Technology Co., Ltd. Document name: Notification of Decision on Request for Restoration of Right |