CN107039951B - Battery protecting circuit and lithium battery - Google Patents
Battery protecting circuit and lithium battery Download PDFInfo
- Publication number
- CN107039951B CN107039951B CN201710158955.3A CN201710158955A CN107039951B CN 107039951 B CN107039951 B CN 107039951B CN 201710158955 A CN201710158955 A CN 201710158955A CN 107039951 B CN107039951 B CN 107039951B
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- Prior art keywords
- circuit
- voltage
- battery
- overdischarge
- battery protecting
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
Abstract
This application provides a kind of battery protecting circuit and lithium batteries; it include: overdischarge voltage detecting circuit, overdischarge current detection circuit, control circuit, overcurrent restoring circuit and electrification reset circuit; during detecting electrification reset, rising to predeterminated voltage to the VCC voltage of battery protecting circuit, the validity of the output signal of the electrification reset circuit changes；When the output signal of electrification reset circuit is the first validity, battery protecting circuit is forced to overdischarge voltage protection state, and when the output signal of electrification reset circuit is the second validity, no longer pressure battery protecting circuit is overdischarge voltage protection state.Present application addresses battery protection chip bringing onto loads in the prior art to power on deadlock the problem of discharging overcurrent protection state.
Description
Technical field
This application involves power-supply battery technical field more particularly to a kind of battery protecting circuits and lithium battery.
Background technique
Fig. 1 shows the structural schematic diagram of lithium battery in the prior art, as shown, lithium battery is usually by battery core and battery
Circuit composition is protected, battery protecting circuit includes battery protection chip (IC) and two power MOS (Metal Oxide Semiconductor) devices (MD and MC).Each electricity
It includes overcharge voltage detection circuit, overdischarge voltage detecting circuit, overcharge current detection circuit, overdischarge that chip is protected in pond
Current detection circuit, overcurrent restoring circuit and control circuit, after lithium battery connection load or charger when not occurring abnormality,
Two power MOS pipe conductings, lithium battery are normally carried out charge and discharge, and there are conducting resistances for power MOS conducting, so working as BP+ and BP-
Between exist load when discharge current pressure drop can be formed on metal-oxide-semiconductor, discharge current is bigger, and the voltage drop on metal-oxide-semiconductor is bigger, i.e.,
Node VM is bigger relative to the voltage difference of node VSS.Overdischarge current detection circuit is higher than the voltage of VSS by detection VM to examine
It surveys and electric discharge overcurrent condition whether occurs, when detecting that discharge current is excessive, chip can enter electric discharge overcurrent protection state
(EDI), control circuit closes power tube MD to forbid discharging.
Under overcurrent protection state of discharging, in order to enable battery to be restored to regular picture state when load lightens,
Overcurrent restoring circuit there are one protecting in circuit.Because power tube MD is turned off when in electric discharge overcurrent protection state,
The voltage of BP- node can be supported the voltage drawn high close to BP+, and the corresponding voltage for protecting chip VM node similarly can be very
It is high.If not having overcurrent restoring circuit, even if load lightens, VM node remains at very high voltage, overdischarge current detecting
Circuit, which still judges, is currently at electric discharge over-current state, makes whole system deadlock in electric discharge overcurrent protection state, can not restore.
So need to introduce overcurrent restoring circuit, and its working principle is that: after entering electric discharge overcurrent protection state, it can open and be arrived in VM
Drop-down access between VSS, it is intended to drag down VM, if load at this time it is still larger, VM voltage still can be greater than electric discharge overcurrent
Threshold value is protected, once load lightens, VM, which can be pulled down to, is less than electric discharge overcurrent protection threshold value, and such system can reenter
Regular picture state.
In some specific system applications, battery protection chip and power MOS pipe are not placed in battery core, and are placed on system
On application circuit board, when installing battery core in this way, system circuit board is powered on, and battery protection chip is equivalent in loaded situation
It powers on, it is possible to there is powering on the overcurrent protection state of discharging that enters, and due to there is load to connect always, in battery protection chip
The pull-down capability of overcurrent restoring circuit is weaker, even if load is not that very greatly, VM node can not be pulled down to electric discharge overcurrent protection
Threshold value is unable to regular picture hereinafter, to which chip lock is in electric discharge overcurrent protection state, can only be by adding charger activation system.
Prior art deficiency is:
When battery protection chip and power MOS pipe are placed on system application circuit board, on battery protection chip bringing onto load
Lock is electrocuted in electric discharge overcurrent protection state.
Summary of the invention
The embodiment of the present application proposes a kind of battery protecting circuit and lithium battery, to solve battery protection core in the prior art
Piece bringing onto load powers on deadlock the technical issues of discharging overcurrent protection state.
First aspect, the embodiment of the present application provide a kind of battery protecting circuit, comprising: overdischarge voltage detecting electricity
Road, overdischarge current detection circuit, control circuit, overcurrent restoring circuit and electrification reset circuit, wherein the over-discharge piezoelectric voltage
Detection circuit, overdischarge current detection circuit are connected with the control circuit, the overdischarge voltage detecting circuit and described
Electrification reset circuit is connected and is connected to the first feeder ear VCC, and the overdischarge current detection circuit and the overcurrent restore electricity
Road is connected and is connected to voltage detection terminal VM,
When detecting electrification reset, the electrification reset circuit exports useful signal, and the useful signal is for forcing institute
It states battery protecting circuit and is in overdischarge voltage protection state；
When detecting that the voltage of the first feeder ear VCC reaches default the first voltage value, the electrification reset circuit exports nothing
Imitate signal.
The second aspect, the embodiment of the present application provide a kind of lithium battery, including above-mentioned battery protecting circuit and battery core,
The first end of the battery core is connected with the first feeder ear VCC of the battery protecting circuit, second end and the battery protection are electric
The second feeder ear VSS on road is connected, the first power MOS pipe MD for being connected with the first output end of the control circuit, with it is described
The second connected power MOS pipe MC of the second output terminal of control circuit connects and is connected to the second end of the battery core.
It has the beneficial effect that:
Battery protecting circuit and lithium battery provided by the embodiment of the present application work as electricity by increasing electrification reset circuit
When pond protection chip powers on, forces chip to be restored to regular picture state from overdischarge voltage protection state, prevent on bringing onto load
Lock is electrocuted the problem of discharging overcurrent protection state.
Detailed description of the invention
The specific embodiment of the application is described below with reference to accompanying drawings, in which:
Fig. 1 shows the structural schematic diagram of lithium battery in the prior art；
Fig. 2 shows the structural schematic diagrams of battery protecting circuit in the embodiment of the present application；
Fig. 3 shows the structural schematic diagram of lithium battery in the embodiment of the present application.
Specific embodiment
In order to which technical solution and the advantage of the application is more clearly understood, below in conjunction with attached drawing to the exemplary of the application
Embodiment is described in more detail, it is clear that and described embodiment is only a part of the embodiment of the application, rather than
The exhaustion of all embodiments.And in the absence of conflict, the feature in the embodiment and embodiment in this explanation can be mutual
It combines.
In view of the deficiencies of the prior art, the embodiment of the present application proposes a kind of battery protecting circuit and lithium battery, below into
Row explanation.
Fig. 2 shows the structural schematic diagrams of battery protecting circuit in the embodiment of the present application, as shown, the battery protection
Circuit characterized by comprising overdischarge voltage detecting circuit, overdischarge current detection circuit, control circuit, overcurrent are restored
Circuit and electrification reset circuit, wherein the overdischarge voltage detecting circuit, overdischarge current detection circuit with the control
Circuit is connected, and the overdischarge voltage detecting circuit is connected with the electrification reset circuit and is connected to the first feeder ear VCC, institute
Overdischarge current detection circuit is stated to be connected with the overcurrent restoring circuit and be connected to voltage detection terminal VM, wherein
When detecting electrification reset, the electrification reset circuit exports useful signal, and the useful signal is for forcing institute
It states battery protecting circuit and is in overdischarge voltage protection state；
When detecting that the voltage of the first feeder ear VCC reaches default the first voltage value, the electrification reset circuit exports nothing
Imitate signal.
When it is implemented, it can be low level that the useful signal, which can be high level, the invalid signals,；Alternatively, institute
It can be high level that state useful signal, which can be low level, the invalid signals,.
When the electrification reset circuit exports invalid signals, the electrification reset circuit no longer forces the battery protection
Circuit is in overdischarge voltage protection state.
In the specific implementation, it is generally the case that although electrification reset circuit no longer forces the battery protecting circuit at this time
Restore voltage value, electrification reset since overdischarge has not been reached yet in the voltage of VCC in overdischarge voltage protection state, but at this time
Circuit can may still be in overdischarge voltage protection state.
In implementation, when the voltage of the first feeder ear VCC is higher than, preset overdischarge restores voltage VODR and the duration is super
When crossing preset overdischarge recovery delay time TODR, the battery protecting circuit restores normal operating conditions；Wherein, described pre-
If overdischarge restore voltage VODR be higher than the default the first voltage value.
In implementation, the battery protecting circuit be may further include: overcharge voltage detection circuit and overcharge current
Detection circuit, wherein overcharge voltage detection circuit one end is connected with electrification reset circuit and is connected to the first feeder ear
VCC, the other end are connected with the control circuit；Overcharge current detection circuit one end is connected with the overcurrent restoring circuit
And be connected to voltage detection terminal VM, the other end is connected with the control circuit.
In implementation, when the battery protecting circuit is forced to overdischarge voltage protection state, the control circuit output control
Signal processed controls the first power MOS pipe MD and disconnects；When the battery protecting circuit restores normal operating conditions, the control circuit
Output control signal controls the first power MOS pipe MD conducting.
In implementation, when the battery protecting circuit is in overdischarge voltage protection state, the electricity of the voltage detection terminal VM
Crimping is bordering on anode voltage, and the battery protecting circuit is in low-power consumption mode.
In implementation, when the battery protecting circuit is in low-power consumption mode, described in the electrification reset circuit real-time detection
The voltage of first feeder ear VCC.
In implementation, the battery protecting circuit is located on system application circuit board.
Since if battery protection chip and power MOS pipe are placed on system application circuit board, on system circuit board
Electricity, battery protection chip is equivalent to be powered in loaded situation, and using the prior art, the battery protection chip has
It is likely to occur to power on and enters electric discharge overcurrent protection state, and due to there is load to connect always, overcurrent is extensive in battery protection chip
The pull-down capability of compound circuit is weaker, and chip lock is unable to regular picture in electric discharge overcurrent protection state；And it uses provided herein
Scheme, due to increasing electrification reset circuit, when detecting electrification reset electrification reset circuit output useful signal be used for
The battery protecting circuit is forced to be in overdischarge voltage protection state, to avoid chip lock in electric discharge overcurrent protection state.
Fig. 3 shows the structural schematic diagram of lithium battery in the embodiment of the present application, as shown, the lithium battery includes above-mentioned
Battery protecting circuit and battery core, the first end of the battery core is connected with the first feeder ear VCC of the battery protecting circuit,
Two ends are connected with the second feeder ear VSS of the battery protecting circuit, to be connected with the first output end of the control circuit
One power MOS pipe MD, the second power MOS pipe MC being connected with the second output terminal of the control circuit connect and are connected to described
The second end of battery core.
In implementation, the grid of the first power MOS pipe MD is connected with the control circuit, source electrode and the battery core the
Two ends be connected, drain electrode be connected with the drain electrode of the second power MOS pipe MC, the grid of the second power MOS pipe MC with it is described
Control circuit is connected, source electrode is connected with the voltage detection terminal VM.
In implementation, the source electrode of the first end of the battery core and the second power MOS pipe MC are separately connected load.
The embodiment of the present application increases electrification reset circuit on the basis of existing technology, from detecting that electrification reset opens
Begin, to battery protection chip (battery protection ic) power supply rise to predeterminated voltage during, electrification reset circuit output believes
Number from effectively becoming invalid.
When power-on reset signal is effective, battery protection chip is forced in overdischarge voltage protection state, chip is forbidden
Electric discharge, VM can be pulled high to close to BP+ voltage, at this point, chip can be in low-power consumption mode.Meanwhile the embodiment of the present application will
Battery protection chip is set as self recovery under low-power consumption mode (that is, chip, under low-power consumption mode, still detection battery core is electric
Pressure), as the supply voltage of battery protection chip rises, power-on reset signal can become in vain, and no longer pressure chip was in
Discharge voltage guard mode, once protection chip power voltage, which is higher than overdischarge, restores voltage (VODR), and the duration is big
Restore delay time (TODR) in overdischarge, is then restored to normal condition from low power consumpting state, power MOS pipe MD is opened, this
Sample, VM can be dragged down rapidly by power MOS pipe, and the power supply of battery protection chip is also at normal working voltage state at this time, from
And can be loaded with normal driving, system deadlock is avoided the problem of discharging overcurrent protection state.
Wherein, electrification reset circuit described in the embodiment of the present application can there are many implementations, as long as can guarantee electricity
In overdischarge voltage protection shape when source voltage exports two states when low and high while making battery protection chip initial power-on
State, those skilled in the art can designed, designed according to actual needs, specific structure of the application to electrification reset circuit
With no restrictions.
Battery protecting circuit provided by the embodiment of the present application works as battery protection chip by increasing electrification reset circuit
When powering on, forces chip to be restored to regular picture state from overdischarge voltage protection state, prevent bringing onto load from powering on deadlock and putting
The problem of electric overcurrent protection state.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.
Claims (10)
1. a kind of battery protecting circuit characterized by comprising overdischarge voltage detecting circuit, overdischarge current detection circuit,
Control circuit, overcurrent restoring circuit and electrification reset circuit, wherein the overdischarge voltage detecting circuit, the inspection of overdischarge electric current
Slowdown monitoring circuit is connected with the control circuit, and the overdischarge voltage detecting circuit is connected and connects with the electrification reset circuit
To the first feeder ear VCC, the overdischarge current detection circuit is connected with the overcurrent restoring circuit and is connected to voltage detecting
VM is held,
When detecting electrification reset, the electrification reset circuit exports useful signal, and the useful signal is for forcing the electricity
Pond protection circuit is in overdischarge voltage protection state；
When detecting that the voltage of the first feeder ear VCC reaches default the first voltage value, the invalid letter of electrification reset circuit output
Number.
2. battery protecting circuit as described in claim 1, which is characterized in that preset when the voltage of the first feeder ear VCC is higher than
Overdischarge when to restore voltage VODR and duration be more than that preset overdischarge restores delay time TODR, the battery protection
Circuit restores normal operating conditions；Wherein, the preset overdischarge restores voltage VODR higher than the default the first voltage value.
3. battery protecting circuit as described in claim 1, which is characterized in that further comprise: overcharge voltage detection circuit
With overcharge current detection circuit, wherein overcharge voltage detection circuit one end is connected and connect with electrification reset circuit
It is connected to the first feeder ear VCC, the other end with the control circuit；Overcharge current detection circuit one end and the overcurrent
Restoring circuit is connected and is connected to voltage detection terminal VM, the other end is connected with the control circuit.
4. battery protecting circuit as described in claim 1, which is characterized in that the battery protecting circuit is forced to overdischarge electricity
When pressing guard mode, the control circuit output control signal controls the first power MOS pipe MD and disconnects；The battery protecting circuit
When restoring normal operating conditions, the control circuit output control signal controls the first power MOS pipe MD conducting.
5. battery protecting circuit as described in claim 1, which is characterized in that the battery protecting circuit is in over-discharge piezoelectric voltage
When guard mode, for the voltage of the voltage detection terminal VM close to anode voltage, the battery protecting circuit is in low function
Consumption mode.
6. battery protecting circuit as claimed in claim 5, which is characterized in that the battery protecting circuit is in low-power consumption mode
When, the voltage of the first feeder ear VCC described in the electrification reset circuit real-time detection.
7. battery protecting circuit as described in claim 1, which is characterized in that the battery protecting circuit is located at system application electricity
On the plate of road.
8. a kind of lithium battery, which is characterized in that including the battery protecting circuit and battery core as described in claim 1 to 7 is any,
The first end of the battery core is connected with the first feeder ear VCC of the battery protecting circuit, second end and the battery protection are electric
The second feeder ear VSS on road is connected, the first power MOS pipe MD for being connected with the first output end of the control circuit, with it is described
The second connected power MOS pipe MC of the second output terminal of control circuit connects and is connected to the second end of the battery core.
9. lithium battery as claimed in claim 8, which is characterized in that the grid of the first power MOS pipe MD and the control
Circuit is connected, source electrode is connected with the second end of the battery core, draining is connected with the drain electrode of the second power MOS pipe MC, described
The grid of second power MOS pipe MC is connected with the control circuit, source electrode is connected with the voltage detection terminal VM.
10. lithium battery as claimed in claim 9, which is characterized in that the first end of the battery core and second function
The source electrode of rate metal-oxide-semiconductor MC is separately connected load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710158955.3A CN107039951B (en) | 2017-03-17 | 2017-03-17 | Battery protecting circuit and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710158955.3A CN107039951B (en) | 2017-03-17 | 2017-03-17 | Battery protecting circuit and lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107039951A CN107039951A (en) | 2017-08-11 |
| CN107039951B true CN107039951B (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710158955.3A Active CN107039951B (en) | 2017-03-17 | 2017-03-17 | Battery protecting circuit and lithium battery |
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| CN (1) | CN107039951B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425508A (en) * | 2017-08-14 | 2017-12-01 | 惠州市德赛电池有限公司 | A kind of multiple current foldback circuit of battery |
| CN108535657B (en) * | 2018-03-29 | 2021-12-28 | 深圳市道通智能航空技术股份有限公司 | Unmanned aerial vehicle battery safety protection method and device thereof |
| CN108923489B (en) * | 2018-07-25 | 2020-10-27 | 南京中感微电子有限公司 | Battery protection circuit |
| CN110198025B (en) * | 2019-06-26 | 2021-05-07 | 南京中感微电子有限公司 | Battery protection system with temperature detection circuit |
| WO2022057596A1 (en) * | 2020-09-15 | 2022-03-24 | 西安稳先半导体科技有限责任公司 | Battery protection circuit, battery assembly and electronic device |
| CN112117799B (en) * | 2020-09-15 | 2022-10-21 | 西安稳先半导体科技有限责任公司 | Battery protection circuit, battery pack and electronic device |
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| CN203205845U (en) * | 2012-11-22 | 2013-09-18 | 无锡中星微电子有限公司 | Battery protection circuit with post-discharge overcurrent protection self-recovery function |
| CN103474967A (en) * | 2012-06-07 | 2013-12-25 | 苏州赛芯电子科技有限公司 | Highly-integrated battery protection circuit |
| CN103532104A (en) * | 2013-10-17 | 2014-01-22 | 无锡中星微电子有限公司 | Battery protection circuit |
| CN203660517U (en) * | 2014-01-09 | 2014-06-18 | 上海长园维安电子线路保护有限公司 | Additional automatic recovery device of lithium battery protection circuit |
| CN104319742A (en) * | 2014-10-28 | 2015-01-28 | 无锡中星微电子有限公司 | Battery protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005229774A (en) * | 2004-02-16 | 2005-08-25 | Seiko Instruments Inc | Battery state monitoring circuit and battery device |
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| CN103474967A (en) * | 2012-06-07 | 2013-12-25 | 苏州赛芯电子科技有限公司 | Highly-integrated battery protection circuit |
| CN203205845U (en) * | 2012-11-22 | 2013-09-18 | 无锡中星微电子有限公司 | Battery protection circuit with post-discharge overcurrent protection self-recovery function |
| CN103532104A (en) * | 2013-10-17 | 2014-01-22 | 无锡中星微电子有限公司 | Battery protection circuit |
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| Publication number | Publication date |
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| CN107039951A (en) | 2017-08-11 |
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