CN201601479U - Failure detection protective circuit of soft-packaged lithium batteries - Google Patents
Failure detection protective circuit of soft-packaged lithium batteries Download PDFInfo
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- CN201601479U CN201601479U CN2009202622916U CN200920262291U CN201601479U CN 201601479 U CN201601479 U CN 201601479U CN 2009202622916 U CN2009202622916 U CN 2009202622916U CN 200920262291 U CN200920262291 U CN 200920262291U CN 201601479 U CN201601479 U CN 201601479U
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Abstract
The utility model discloses a failure detection 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 and a discharge control MOS tube. The protective circuit is characterized by further comprising an overcharge protection branched circuit. The overcharge protection branched circuit includes a second resistor, a third resistor, an overcharge protection MOS tube and a membrane switch used for detecting whether or not a battery bulges. The membrane switch is disposed between the first battery and the second battery. A G pole of the overcharge protection MOS tube is connected to one end of the membrane switch, and the other end of the membrane switch is connected to a positive EB terminal via the second resistor. An S pole of the overcharge protection MOS tube is connected to a negative EB terminal. A D pole of the overcharge protection MOS tube is connected to a charge control end of the battery protection chip via the third resistor. The protective circuit is capable of timely cutting off a battery charge loop in case of battery bulging, preventing continuous charge 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 fault detect protective 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 fault detect protective 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 fault detect protective 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 fault detect protective 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 S utmost point of discharge control metal-oxide-semiconductor connects the negative pole of first battery; 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 branch road comprises second resistance, the 3rd resistance, over-charge protective metal-oxide-semiconductor and is used to detect the thin film switch whether battery produces bulging; Described thin film switch is arranged between first battery and second battery;
The G utmost point that described over-charge protective metal-oxide-semiconductor is logical connects an end of thin film switch, and the other end of thin film switch is received the EB+ end by second resistance; The S utmost point of over-charge protective metal-oxide-semiconductor connects the EB-end; The D utmost point of over-charge protective metal-oxide-semiconductor connects the charging control end of battery protection chip by the 3rd resistance.
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 bulging, by additives for overcharge protection circuitry cuts charge circuit, effectively protects the safety of battery.The utility model has been added one deck protection on the basis of original protective circuit, therefore, adopt flexible package type lithium battery fault detect protective 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 fault detect protective circuit;
Fig. 2 is the circuit diagram of flexible package type lithium battery fault detect protective 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 fault detect protective 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 fault detect protective 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 S utmost point of discharge control metal-oxide-semiconductor connects the negative pole of first battery; 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 branch road comprises second resistance R 4, the 3rd resistance R 5, over-charge protective metal-oxide-semiconductor Q2 and is used to detect the thin film switch S1 whether battery produces bulging; Described thin film switch is arranged between first battery and second battery;
The G utmost point that described over-charge protective metal-oxide-semiconductor is logical connects an end of thin film switch, and the other end of thin film switch is received the EB+ end by second resistance R 4; The S utmost point of over-charge protective metal-oxide-semiconductor connects the EB-end; The D utmost point of over-charge protective metal-oxide-semiconductor connects the charging control end of battery protection chip by the 3rd resistance R 5.
This circuit is to increase thin film switch S1, over-charge protective metal-oxide-semiconductor Q2 (being specially the N-channel MOS pipe), second resistance R 4, the 3rd resistance R 5 on the basis of the circuit structure of Fig. 1; thin film switch S1 is placed the centre of two joint soft-package batteries; 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; by second resistance R 4; the grid of over-charge protective metal-oxide-semiconductor Q2 has just had high voltage; the drain electrode (D) of over-charge protective metal-oxide-semiconductor Q2; source electrode (S) is conducting fully just; pass through the 3rd resistance R 5 again the grid of the charge protection metal-oxide-semiconductor of Q1; source electrode (G; S) join; the final charging MOS that makes is in complete off state always; no longer be subjected to any influence of IC1; make battery can not continue charging again, battery just can not occur continuing the consequence of deterioration after little blow-up yet, thereby has protected 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 fault detect protective 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 fault detect protective 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 S utmost point of discharge control metal-oxide-semiconductor connects the negative pole of first battery; 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 branch road comprises second resistance, the 3rd resistance, over-charge protective metal-oxide-semiconductor and is used to detect the thin film switch whether battery produces bulging; Described thin film switch is arranged between first battery and second battery;
The G utmost point that described over-charge protective metal-oxide-semiconductor is logical connects an end of thin film switch, and the other end of thin film switch is received the EB+ end by second resistance; The S utmost point of over-charge protective metal-oxide-semiconductor connects the EB-end; The D utmost point of over-charge protective metal-oxide-semiconductor connects the charging control end of battery protection chip by the 3rd resistance.
2. flexible package type lithium battery fault detect protective 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 |
|---|---|---|---|
| CN2009202622916U CN201601479U (en) | 2009-12-31 | 2009-12-31 | Failure detection protective circuit of soft-packaged lithium batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202622916U CN201601479U (en) | 2009-12-31 | 2009-12-31 | Failure detection protective circuit of soft-packaged lithium batteries |
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| Publication Number | Publication Date |
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| CN201601479U true CN201601479U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202622916U Expired - Fee Related CN201601479U (en) | 2009-12-31 | 2009-12-31 | Failure detection protective circuit of soft-packaged lithium batteries |
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| CN (1) | CN201601479U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904218A (en) * | 2011-07-26 | 2013-01-30 | 精工电子有限公司 | Battery protection IC and battery device |
| CN108682289A (en) * | 2018-07-10 | 2018-10-19 | 成都中辰信息科技有限公司 | A kind of school bag is listed |
| CN111352035A (en) * | 2018-12-20 | 2020-06-30 | 技嘉科技股份有限公司 | Electronic device capable of detecting battery expansion and battery expansion |
| CN112311030A (en) * | 2019-07-30 | 2021-02-02 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack, and battery pack protection method |
-
2009
- 2009-12-31 CN CN2009202622916U patent/CN201601479U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904218A (en) * | 2011-07-26 | 2013-01-30 | 精工电子有限公司 | Battery protection IC and battery device |
| CN102904218B (en) * | 2011-07-26 | 2016-11-02 | 精工半导体有限公司 | Battery protection ic and cell apparatus |
| CN108682289A (en) * | 2018-07-10 | 2018-10-19 | 成都中辰信息科技有限公司 | A kind of school bag is listed |
| CN111352035A (en) * | 2018-12-20 | 2020-06-30 | 技嘉科技股份有限公司 | Electronic device capable of detecting battery expansion and battery expansion |
| CN112311030A (en) * | 2019-07-30 | 2021-02-02 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack, and battery pack protection method |
| CN112311030B (en) * | 2019-07-30 | 2022-06-21 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack, and battery pack protection method |
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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 |