CN201708529U - Charging protection device for lithium battery charger - Google Patents
Charging protection device for lithium battery charger Download PDFInfo
- Publication number
- CN201708529U CN201708529U CN2009202704526U CN200920270452U CN201708529U CN 201708529 U CN201708529 U CN 201708529U CN 2009202704526 U CN2009202704526 U CN 2009202704526U CN 200920270452 U CN200920270452 U CN 200920270452U CN 201708529 U CN201708529 U CN 201708529U
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- China
- Prior art keywords
- charger
- diode
- lithium battery
- protection device
- battery
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- 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.)
- Expired - Fee Related
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A charging protection device for a lithium battery charger is electrically connected with a lithium battery and a charger and comprises a battery protection control IC (100), a main switch tube (101) and a diode (103) parallelly connected with the charger (104). A positive electrode of the diode (103) is electrically connected with a negative electrode of the charger (104), and a negative electrode of the diode (103) is electrically connected with a positive electrode of the charger (104). When the charger is reversely connected, the diode positions a P-port electric potential clamp at the sum position of battery pressure and forward break-over voltage of the diode, thereby avoiding faults such as explosion and the like of the battery when the charger is reversely connected.
Description
Technical field
The utility model relates to a kind of charge protection device, the li-ion cell protection when being mainly used in the lithium battery charger reversal connection.
Background technology
Traditional battery protecting apparatus mainly is that the method by battery protection control circuit and external charge switch, discharge switch realizes.Recently some have occurred switch MOS FET and battery protection control circuit are integrated in the scheme of same chip substrate, this scheme has reduced the scheme cost owing to dwindled greatly and account for the plate area, has therefore obtained more and more widely application.In order to reduce integrated back area of chip, this scheme is reduced to a switching tube MOSFET with two switching tube MOSFET, as shown in Figure 3, the function that this switching tube MOSFET had not only served as charge switch but also served as discharge switch, its substrate can freely be switched by battery control circuit.This switching tube MOSFET structure generally adopts CMOS or LDMOS, and this switch MOS FET reverse breakdown voltage has only about 12 volts usually.
Under normal operating position when (as charging normal or regular picture), the voltage that this switching tube MOSFET is born is cell voltage or charger voltage, generally is not higher than 6 volts, so 12 volts reverse breakdown voltage is enough for lithium battery.But under given conditions, when charging to cellular li-ion battery by universal charger as the user, might be because of carelessness the polarity and the battery polar of universal charger be connect instead, in case this situation takes place, the voltage that is added in switching tube MOSFET B-/P-is cell voltage and charger voltage sum, when constant be 12 volts, but will be above 12 volts at reversal connection transient peak voltage, the reverse breakdown voltage that surpasses switching tube MOSFET, switching tube will damage, thereby can not normal turn-off after causing charging to be finished or directly cause spark or smolder in reversal connection moment.These situations all may make lithium battery blast, the crisis people security of the lives and property.
The utility model content
The technical problems to be solved in the utility model provides a kind of charge protection device that is used for lithium battery charger.
In order to realize above-mentioned technical purpose, the utility model provides following technical scheme:
A kind of charge protection device that is used for lithium battery charger; be electrically connected with lithium battery, charger; comprise battery protection control IC, main switch; it also comprises diode; described diode is in parallel with described charger; wherein diode cathode is connected with the charger negative electricity, and diode cathode is connected with the charger positive electrical.
The forward conduction voltage of diode and cell voltage and less than the reverse breakdown voltage of main switch; When the charger reversal connection, diode in the extremely short time with P-port current potential clamper in cell voltage and diode forward conducting voltage with, can avoid battery when the charger reversal connection, to break down.At this moment, this diode is recharged the device positive charge, and its charging current is the maximum charge stream of charger.
As the further improvement to the technical program, the sustainable conducting electric current of the forward of described diode is not less than the maximum charging current of charger, and the forward moment conducting electric current of described diode is not less than 5 times of charger maximum charging current; This can guarantee that this diode can not damage because of charging current is excessive.
Moreover described main switch has 1 isolated form NMOSFET, and its substrate can freely switch by the battery protection control IC.
Moreover described diode is a Schottky diode; It has advantages such as the high and forward voltage drop of switching frequency is low, and forward conduction voltage drop is only about 0.4V; When the charger reversal connection, this diode can be fast will be added in voltage clamp on the main switch on the position higher 0.4 volt than cell voltage, and this diode forward can continue to flow through the maximum charging current that charger can provide simultaneously.
At last, described main switch comprises 1 NMOSFET or 1 PMOSFET; When battery charging and discharging is unusual, can realize turn-offing fully, have very little conducting resistance during conducting.
The technical solution of the utility model can guarantee that the user does not damage switching tube MOSFET when the charger reversal connection, prevents phenomenon of the failure generations such as lithium battery blast.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, and constitutes the part of specification, is used from explanation the utility model with embodiment one of the present utility model, does not constitute restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the user mode circuit diagram of the utility model charge protection device of being used for lithium battery charger;
Fig. 2 is the reversal connection status circuit schematic diagram of the utility model charge protection device of being used for lithium battery charger;
Fig. 3 is existing charge protection device charged state circuit diagram;
Mark among Fig. 1-Fig. 3 is illustrated as, 100 battery protection control IC, 101 battery protection main switches, 102 batteries, 103 diodes, 104 chargers.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in qualification the utility model.
As shown in Figure 1, a kind of charge protection device that is used for lithium battery charger, main switch 101 is made of isolated form N channel transistor (NMOSFET), and its underlayer voltage can freely be switched by battery protection control IC 100; The diode 103 that is used to solve the reversal connection problem is Schottky diodes, can not damage because of charging current is excessive for guaranteeing it, will guarantee that when type selecting the forward conduction electric current of this diode 103 is not less than the maximum charging current of charger 104.As shown in Figure 2, when charger 104 reversal connections, Schottky diode 103 in the extremely short time with P-port current potential clamper in cell voltage and Schottky diode 103 forward conduction voltages with, size is about 5 volts.This voltage is that 12 volts main switch 101 is as safe as a house for reverse breakdown voltage, guarantees that main switch 101 can not damage, thereby has avoided battery to blast when charger 104 reversal connections.This moment, this Schottky diode 101 was recharged device 104 positive charge, and its charging current is the maximum charge stream of charger 104.
Claims (5)
1. charge protection device that is used for lithium battery charger; be connected with lithium battery charger, lithium battery; it comprises battery protection control IC (100), main switch (101); it is characterized in that: described charge protection device also comprises diode (103); described diode (103) is in parallel with described charger (104); wherein diode (103) is anodal is connected with charger (104) negative electricity, and diode (103) negative pole is connected with charger (104) positive electrical.
2. the charge protection device that is used for lithium battery charger according to claim 1; it is characterized in that: the sustainable conducting electric current of the forward of described diode (103) is not less than the maximum charging current of charger (104), and the forward moment conducting electric current of described diode (103) is not less than 5 times of charger (104) maximum charging current.
3. the charge protection device that is used for lithium battery charger according to claim 1 is characterized in that: described main switch (101) has 1 isolated form NMOSFET, and its substrate can freely switch by battery protection control IC (100).
4. the charge protection device that is used for lithium battery charger according to claim 1 and 2 is characterized in that: described diode (103) is a Schottky diode.
5. the charge protection device that is used for lithium battery charger according to claim 3 is characterized in that: described main switch (101) comprises 1 NMOSFET or 1 PMOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202704526U CN201708529U (en) | 2009-11-23 | 2009-11-23 | Charging protection device for lithium battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202704526U CN201708529U (en) | 2009-11-23 | 2009-11-23 | Charging protection device for lithium battery charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201708529U true CN201708529U (en) | 2011-01-12 |
Family
ID=43445680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202704526U Expired - Fee Related CN201708529U (en) | 2009-11-23 | 2009-11-23 | Charging protection device for lithium battery charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201708529U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022541A (en) * | 2013-02-28 | 2014-09-03 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
-
2009
- 2009-11-23 CN CN2009202704526U patent/CN201708529U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022541A (en) * | 2013-02-28 | 2014-09-03 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20181123 |