CN201611772U - Self-protecting circuit of flexible packaging type lithium battery - Google Patents
Self-protecting circuit of flexible packaging type lithium battery Download PDFInfo
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- CN201611772U CN201611772U CN2009202622865U CN200920262286U CN201611772U CN 201611772 U CN201611772 U CN 201611772U CN 2009202622865 U CN2009202622865 U CN 2009202622865U CN 200920262286 U CN200920262286 U CN 200920262286U CN 201611772 U CN201611772 U CN 201611772U
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Abstract
The utility model discloses a self-protecting circuit of a flexible packaging type lithium battery, which comprises a battery protecting chip, a first battery and a second battery which are connected in series, a charging control MOS tube and a discharging control MOS tube. The self-protecting circuit of the flexible packaging type lithium battery is characterized by also comprising a charging protecting circuit; the charging protecting circuit comprises a relay and a membrane switch which is used for detecting whether the batteries are ballooned; the membrane switch is arranged between the first battery and the second battery; the membrane switch is connected with the coil of the relay in series, and then bridged at two ends of a battery group formed by the first battery and the second battery; and two ends of a group of normally opened contacts of the relay are respectively connected with a G pole and an S pole of the charging control MOS tube. When the batteries are ballooned, the self-protecting circuit can cut off the charge loop of batteries in time so as to stop charging of the ballooned battery, thus realizing further protection on the battery.
Description
Technical field
The utility model belongs to the lithium battery protection circuit field, relates to a kind of flexible package type lithium battery self-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 self-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 self-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 self-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 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 circuit;
Described additives for overcharge protection circuit comprises relay 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;
Be connected across the two ends of the battery pack of first battery and second battery formation behind the coil tandem of thin film switch and relay;
The G utmost point and S that the two ends of one group of normally opened contact of relay are connected on charging control metal-oxide-semiconductor respectively extremely go up.
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 the additives for overcharge protection circuitry cuts charge circuit based on relay, 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 self-protection circuit of the present utility model, and fail safe is higher.
Description of drawings
Fig. 1 is existing flexible package type lithium battery self-protection circuit's a circuit diagram;
Fig. 2 is a flexible package type lithium battery self-protection circuit's of the present utility model circuit diagram.
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 self-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 self-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 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 circuit;
Described additives for overcharge protection circuit comprises relay and is used to detect the thin film switch S1 whether battery produces bulging; Described thin film switch S1 is arranged between the first battery BAT1 and the second battery BAT2;
Thin film switch S1 and the two ends that are connected across the battery pack that first battery and second battery form after the coil KA1 of relay is connected in series;
The G utmost point and S that the two ends of one group of normally opened contact KA2 of relay are connected on charging control metal-oxide-semiconductor respectively extremely go up.
This circuit is to increase relay and thin film switch S1 on the basis of the circuit structure of Fig. 1, and thin film switch S1 is placed the centre of two joint soft-package batteries, and 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; the coil KA1 of relay gets; the normally opened contact KA2 closure of relay; grid, source electrode (G, S) short circuit with the charge protection metal-oxide-semiconductor of Q1; 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.The consequence that worsens just can not appear continuing after little blow-up in battery yet, 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 self-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 self-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 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 circuit;
Described additives for overcharge protection circuit comprises relay 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;
Be connected across the two ends of the battery pack of first battery and second battery formation behind the coil tandem of thin film switch and relay;
The G utmost point and S that the two ends of one group of normally opened contact of relay are connected on charging control metal-oxide-semiconductor respectively extremely go up.
2. flexible package type lithium battery self-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 |
|---|---|---|---|
| CN2009202622865U CN201611772U (en) | 2009-12-31 | 2009-12-31 | Self-protecting circuit of flexible packaging type lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202622865U CN201611772U (en) | 2009-12-31 | 2009-12-31 | Self-protecting circuit of flexible packaging type lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201611772U true CN201611772U (en) | 2010-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202622865U Expired - Fee Related CN201611772U (en) | 2009-12-31 | 2009-12-31 | Self-protecting circuit of flexible packaging type lithium battery |
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| Country | Link |
|---|---|
| CN (1) | CN201611772U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048620A (en) * | 2015-09-09 | 2015-11-11 | 桂林电子科技大学 | Intelligent management system for power generation appliances |
-
2009
- 2009-12-31 CN CN2009202622865U patent/CN201611772U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048620A (en) * | 2015-09-09 | 2015-11-11 | 桂林电子科技大学 | Intelligent management system for power generation appliances |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101020 Termination date: 20131231 |
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| 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 |
|
| 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 |