CN107332319A - Battery protecting circuit, battery and terminal - Google Patents
Battery protecting circuit, battery and terminal Download PDFInfo
- Publication number
- CN107332319A CN107332319A CN201710773184.9A CN201710773184A CN107332319A CN 107332319 A CN107332319 A CN 107332319A CN 201710773184 A CN201710773184 A CN 201710773184A CN 107332319 A CN107332319 A CN 107332319A
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- Prior art keywords
- oxide
- metal
- semiconductor
- chip
- battery
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
Abstract
The invention discloses a kind of battery protecting circuit, battery and terminal, the battery protecting circuit includes core protection circuit and the sub- protection circuit of at least one in parallel with the core protection circuit；The core protection circuit includes the first chip IC 1 and first switch group；The first switch group includes the first switch and second switch of concatenation, and the DO ends of the first chip IC 1 are connected with first switch, CO ends are connected with second switch；The sub- protection circuit includes the second chip IC 2 and second switch group；The second switch group includes the 3rd switch and the 4th switch of concatenation, and the DO ends of the second chip IC 2 are connected with the 3rd switch, CO ends are connected with the 4th switch.The present invention can reduce protection board internal resistance, reduce the heating of protection board, and then reduce battery-heating so that battery lasts are in charged state, improve charging rate, the effect for allowing Consumer's Experience to fill soon.
Description
Technical field
The present invention relates to battery protection technical field, more particularly to a kind of battery protecting circuit, battery and terminal.
Background technology
With the popularization of the electronic equipment for consumption such as mobile phone and flat board, requirement of the people to electronic equipment for consumption battery is got over
Come higher.The heating of battery can cause charging rate slack-off, while the cycle life to battery is unfavorable, therefore, in certain temperature
Under the conditions of charging, it is necessary to battery carry out different temperatures under current limliting, the polymer Li-ion battery charging work temperature used at present
Degree is carried out under conditions of 0 to 60 DEG C, wherein in 45 DEG C of high temperature section to 60 DEG C, it is necessary to charging current be reduced, in order to not influence electricity
The charging rate in pond, charging temperature should try one's best control at 10 DEG C to 45 DEG C.
The battery capacity of current electronic equipment for consumption is increasing, in the case of filling soon, electric current stream when battery charges
Speed is accelerated, and causes battery and battery protecting plate seriously to generate heat.Battery protecting plate is as one of part of battery, and it generates heat straight
Influence NTC detections are connect, and because thermal conduction characteristic, the heating of battery protecting plate can increase the surface temperature of battery core, therefore how
Reducing the heating of the battery protecting plate under high current situation turns into technical problem urgently to be resolved hurrily.
The above is only used for auxiliary and understands technical scheme, does not represent and recognizes that the above is existing skill
Art.
The content of the invention
It is a primary object of the present invention to provide a kind of battery protecting circuit, it is intended to solve the heating increase of battery protecting plate
The surface temperature of battery core, and then influence the technical problem of charging rate and Consumer's Experience.
To achieve the above object, the present invention provides a kind of battery protecting circuit, and the battery protecting circuit is protected including core
Protection circuit and the sub- protection circuit of at least one in parallel with the core protection circuit；
The core protection circuit includes the first chip IC 1 and first switch group；The first switch group includes concatenation
First switch and second switch, the DO ends of the first chip IC 1 are connected with first switch, CO ends are connected with second switch；
The sub- protection circuit includes the second chip IC 2 and second switch group；The second switch group includes the of concatenation
Three switches and the 4th switch, the DO ends of the second chip IC 2 are connected with the 3rd switch, CO ends are connected with the 4th switch.
In a kind of optional embodiment, the first switch group is the first metal-oxide-semiconductor group, the first metal-oxide-semiconductor group bag
The first metal-oxide-semiconductor and the second metal-oxide-semiconductor are included, the drain electrode of first metal-oxide-semiconductor is connected with the drain electrode of the second metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor
Pole is connected with the DO ends of the first chip IC 1, and the second metal-oxide-semiconductor grid is connected with the CO ends of the first chip IC 1；
The second switch group is the second metal-oxide-semiconductor group, and the second metal-oxide-semiconductor group includes the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor,
The drain electrode of 3rd metal-oxide-semiconductor is connected with the drain electrode of the 4th metal-oxide-semiconductor, and the DO ends of the grid of the 3rd metal-oxide-semiconductor and the second chip IC 2 connect
Connect, the 4th metal-oxide-semiconductor grid is connected with the CO ends of the second chip IC 2.
In a kind of optional embodiment, the core protection circuit includes first resistor R1 and the first electric capacity C1, institute
Stating sub- protection circuit includes second resistance R2 and the second electric capacity C2；
First resistor R1 one end connection battery core positive pole, the other end connect the vdd terminal of the first chip IC 1, described first
Electric capacity C1 one end connects the VSS ends that the vdd terminal of the first chip IC 1, the other end connect the first chip IC 1；
Second resistance R2 one end connection battery core positive pole, the other end connect the vdd terminal of the second chip IC 2, described second
Electric capacity C2 one end connects the vdd terminal of the second chip IC 2, and the other end connects the VSS ends of the second chip IC 1.
In a kind of optional embodiment, the sub- protection circuit also includes：The VSS terminations of second chip IC 2
Ground.
In a kind of optional embodiment, the battery protecting circuit also includes：First sampling resistor RS1 and second is adopted
Sample resistance RS2；
First sampling resistor RS1 mono- termination battery cores negative pole, the other end connect the second sampling resistor RS2；
The other end that second sampling resistor RS2 deviates the first sampling resistor RS1 is connected with the source electrode of the 3rd metal-oxide-semiconductor；
The VSS ends of first chip IC 1 be connected to the second sampling resistor RS2 be inclined to the first sampling resistor RS1 one end,
RSENS ends are connected to one end that the second sampling resistor RS2 deviates the first sampling resistor RS1；
The RSENS ends of second chip IC 2 are connected to the second sampling resistor RS2 two ends, for detecting the second sampling resistor RS2
Both end voltage.
In a kind of optional embodiment, the core protection circuit includes 3rd resistor R3, the sub- protection circuit
Including the 4th resistance R4；
The excessively stream of described 3rd resistor R3 one end and the first chip IC 1, short-circuit detecting end are connected, the other end and the 2nd MOS
The source electrode connection of pipe；
The excessively stream of described 4th resistance R4 one end and the second chip IC 2, short-circuit detecting end are connected, the other end and the 4th MOS
The source electrode connection of pipe, the source electrode of the first metal-oxide-semiconductor and the 4th resistance R4 are connected with the node that the 4th metal-oxide-semiconductor source electrode is connected.
In a kind of optional embodiment, the core protection circuit includes the 3rd electric capacity C3, sub- protection circuit
Including the 4th electric capacity C4；
The 3rd electric capacity C3 of the first metal-oxide-semiconductor group two ends parallel connection, the 4th electric capacity C4 of the second metal-oxide-semiconductor group two ends parallel connection.
In a kind of optional embodiment, the battery protecting circuit also includes：NTC thermistor and identification resistance；
Described NTC thermistor one end and 3rd resistor R3 are connected with the node that the second metal-oxide-semiconductor is connected, the other end is as electricity
Pond protection circuit output interface；
Described identification resistance one end and 3rd resistor R3 are connected with the node that the second metal-oxide-semiconductor is connected, the other end is as battery
Protection circuit output interface.
To achieve the above object, the present invention also provides a kind of battery, and the battery includes battery protection as described above
Circuit and battery core, the battery protecting circuit are connected with battery core.
To achieve the above object, the present invention also provides a kind of terminal, and the terminal includes the battery.
The battery protecting circuit of the present invention, by removing PTC, reduces battery PTC internal resistances, and between the switches set of this circuit
Parallel connection, reduces the internal resistance of switches set, so as to reduce the internal resistance of battery protecting plate, battery protecting plate heater members are mainly PTC
And switch, this scheme eliminates a pyrotoxin PTC, and reduces switch internal resistance, according to the principle of heating：Power P=
I2R, when battery is charged under certain electric current, internal resistance R is reduced, and power will be reduced, so as to reduce battery protecting plate
Temperature rise, can maintain 10 to 45 DEG C so that battery can charge always, improve charging rate by the temperature of protection board, allow use
The effect that family experience is filled soon.
Brief description of the drawings
Fig. 1 is the electrical block diagram in the embodiment of battery protecting circuit one of the present invention；
Fig. 2 be the embodiment of battery protecting circuit one of the present invention in presence PTC the second battery protecting circuit structural representation
Figure；
Fig. 3 is battery composition structural representation in the embodiment of battery protecting circuit one of the present invention；
Fig. 4 is terminal composition structural representation in the embodiment of battery protecting circuit one of the present invention.
Drawing reference numeral explanation：
| Core protection circuit D1 | Sub- protection circuit D2 | First chip IC 1 |
| First switch group Q1 | First switch K1 | Second switch K2 |
| Second chip IC 2 | Second switch group Q2 | 3rd switch K3 |
| 4th switch K4 | First resistor R1 | First electric capacity C1 |
| Second resistance R2 | Second electric capacity C2 | First sampling resistor RS1 |
| Second sampling resistor RS2 | 3rd resistor R3 | 4th resistance R4 |
| 3rd electric capacity C3 | 4th electric capacity C4 | 5th resistance r5 |
| 5th electric capacity c5 | 5th switch M1 | 6th switch M2 |
| 6th electric capacity c6 | 6th resistance r6 |
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of battery protecting circuit.Reference picture 1, Fig. 1 is the embodiment of battery protecting circuit one of the present invention
Electrical block diagram.
In the present embodiment, the battery protecting circuit includes：Core protection circuit D1 and with the core protection circuit D1
At least one sub- protection circuit D2 in parallel；
The core protection circuit includes the first chip IC 1 and first switch group Q1；The first switch group Q1 includes string
The first switch K1 and second switch K2 connect, the DO ends of the first chip IC 1 are connected with first switch K1, CO ends and second switch K2
Connection；
The sub- protection circuit includes the second chip IC 2 and second switch group Q2；The second switch group Q2 includes concatenation
The 3rd switch K3 and the 4th switch K4, the DO ends of the second chip IC 2 with the 3rd switch K3 be connected, CO ends with the 4th switch K4 company
Connect.
In the present embodiment, the core protection circuit D1 is in parallel with sub- protection circuit D2, and its neutron protection circuit D2 can have
It is multiple.
If Fig. 2 is the second battery protecting circuit in the presence of two grades of over-current protection device PTC (semistor).
PTC is typically series between multiple Resistor-Capacitor Units and battery core.PTC one end connection battery core negative pole, the other end connect the 5th resistance r5
The connecting node exported with second battery protecting circuit；The 5th resistance r5 other end connects the vdd terminal of the 3rd chip IC 3
With the 5th electric capacity c5 connecting node, the 5th electric capacity c5 other end connects the VSS ends of the 3rd chip IC 3, the 3rd chip IC 3
VSS ends are also connected with battery core negative pole；The DO ends connection the 5th of 3rd chip IC 3 switchs M1, CO end connection the 6th and switchs M2, and the 5th opens
Close the switch M2 of M1 and the 6th two ends and connect the 6th electric capacity c6, the 5th switch M1 one end connection battery core negative pole, the other end and the 6th
M2 concatenations are switched, the 6th switch M2 other end connects the second battery protecting circuit output；The V- ends of 3rd chip IC 3 connect
The 6th resistance r6 one end is connect, the 6th resistance r6 other end connection the 6th switchs M2 and exported with second battery protecting circuit
Tie point.Because PTC has shared portion of electrical current, IC and switches set (metal-oxide-semiconductor group) is that can reach overcurrent value.But
It is that PTC resistance raises with temperature and becomes big, according to heating principle：Power P=I2R, the timing of electric current one, resistance increase, power
Increase, heating increase, when battery charges, temperature is constantly in rising or the condition of high temperature, and PTC internal resistance is also with the rise of temperature
Or maintain high temperature and increase or maintain larger resistance value state, and then make it that PTC caloric values are big so that whole battery increases
Plus heating, form vicious circle.
In order to reduce total heating of battery, the present embodiment is by reducing the total internal resistance of battery and then reducing total heating, specifically,
The present embodiment eliminates PTC, and the electric current for flowing through chip and switches set increases to the chip and the peak point current of switches set, in order to
Improve overcurrent value, one or more chips in parallel and one or more switches sets so that two can also be realized by lacking PTC circuit
Level overcurrent protection function, while not causing damage to existing element, PTC removes PTC energy as the main heater element of protection board
Protection board is significantly reduced integrally to generate heat；Meanwhile, because in parallel one or more chips or switches set, compared to traditional list
Chip or single switch group, the internal resistance of whole protection board decrease, according to the principle of heating：Power P=I2R, when battery exists
Charged under certain electric current, internal resistance is reduced, and power will be reduced, and then reduce whole protection board heating.
Battery protecting circuit can be placed in battery, one end connection battery core both positive and negative polarity, other end connection battery plus-negative plate.First
It is direct that the vdd terminal of chip IC 1 directly or indirectly connects the external battery core positive pole of external interface of the battery protecting circuit, VSS ends
Or the external battery core negative pole of external interface of battery protecting circuit described in indirect communication；The vdd terminal of second chip IC 2 is direct or indirect
Connect the external battery core positive pole of external interface of the battery protecting circuit, VSS ends and directly or indirectly connect the battery protection electricity
The external battery core negative pole of external interface on road.It is worth noting that, because chip (including the first chip IC 1 and the second chip IC 2,
It is hereafter same) vdd terminal and VSS ends be used for detect battery core both end voltage, chip vdd terminal is connected with battery core positive pole indirectly, chip VSS
End is connected with battery core negative pole indirectly, includes all indirect connections for measuring battery core both end voltage, for example, battery core negative pole
Ground connection, then chip VSS ends are equally grounded, vdd terminal connects battery core positive pole；Or chip VSS ends do not connect battery core negative pole directly, but
Connection level is approximately equal to the node of battery core negative pole level, and the connection of chip vdd terminal is identical or approximate with battery core positive pole level
Node.
In the present embodiment, first switch K1 and second switch K2, the 3rd switch K3 and the 4th switch K4 can for transistor,
Triode, metal-oxide-semiconductor or relay etc., and first switch K1 and second switch K2, the 3rd switch K3 and the 4th switch K4
Think the switches set of parallel connection, such as first switch K1 is made up of two metal-oxide-semiconductors in parallel.Switches set in parallel can reduce internal resistance,
And then reduce the heating of battery protecting circuit.
First chip IC 1 and the second chip IC 2 act on identical, are both needed to detect the voltage at battery core two ends and the electricity in charge and discharge loop
Stream, and according to the battery core both end voltage that detects and charge and discharge loop current situation, control the closure of switches set that is attached thereto and
Disconnect, so prevent battery core from overcharging, cross put, excessively stream, short circuit, protection battery core safety.Vdd terminal connection battery core positive pole, the core of chip
The VSS ends of piece can connect battery core negative pole, can also connect with battery core negative pole level identical node that (such as a kind of optional embodiment is
Battery core negative pole is grounded simultaneously with chip VSS ends), can also connecting other nodes, (chip detection electricity can be realized by connecting other nodes
The function of core both end voltage).
Chip DO ends are discharge prevention actuating station, and chip CO ends are charge protection actuating station, and chip DO ends and CO ends respectively connect
Connect a switch or a switches set in parallel.In the present embodiment, as shown in figure 1, the DO terminations first of the first chip IC 1 are opened
The second switch K2 in first switch K1, CO termination first switch group Q1 in the group Q1 of pass；The DO terminations second of second chip IC 2
The 4th switch K4 in the 3rd switch K3, CO termination second switch group Q2 in switches set Q2.
Such as Fig. 1, chip by monitoring the cell voltage between connection vdd terminal and VSS ends, and excessively stream, short-circuit detecting end with
Voltage difference between VSS ends realizes that control is charged and discharged, and chip controls switch realizes that the process of battery protection function is as follows：
Overcharge protection：P+, P- connect the both positive and negative polarity of charger respectively, and charging current is filled by two switches sets to battery core
Electricity.At this moment, VDD, VSS of chip are both power end, are also battery core voltage detecting end.With the progress of charging, battery core voltage by
Edge up height, when being increased to protection chip threshold voltage (commonly referred to as overcharging protection voltage), the CO ends output low level of chip
By correspondence switch OFF, charge circuit is also disconnected.Overcharge after protection, battery core voltage can decline, it is electric when dropping to chip thresholding
During pressure (commonly referred to as overcharge protection and recover voltage), the CO ends of chip are recovered high level state and opened to inductive switch.
Over：During battery discharge, VDD, VSS of chip also can be to battery core voltage detectings, when battery core voltage declines
During to chip threshold voltage (commonly referred to as Cross prevention voltage), DO ends output low level will correspondence switch OFF, discharge loop
It is disconnected.After Cross prevention, battery core voltage can rise, and when rising to chip threshold voltage, (commonly referred to as Cross prevention recovers electricity
Pressure) when, DO ends recover high level state and open switch.
Excessively stream, short-circuit protection：(specifically how much ginseng is designed when main circuit current is big in discharge process with reference to protection board
Number), because switch (such as metal-oxide-semiconductor) saturation conduction is there is also internal resistance, so electric current switch ends when flowing through between B-, P- can be produced
Pressure drop is given birth to, the V- and VSS (passing through R3/R4) of chip understand the voltage at detection switch two ends at any time, when voltage rises to chip protection
During thresholding (referred to as discharge over-current detection voltage), output low level will that corresponding switch OFF, discharge loop quilt at once at DO ends
Disconnect.
Further, in one embodiment, first switch K1 and second switch K2, the 3rd switch K3 and the 4th switch K4 are
Metal-oxide-semiconductor.
I.e. described first switch group Q1 is the first metal-oxide-semiconductor group Q1, the first metal-oxide-semiconductor group Q1 include the first metal-oxide-semiconductor K1 and
Second metal-oxide-semiconductor K2；The second switch group Q2 is that the second metal-oxide-semiconductor group Q2, the second metal-oxide-semiconductor group Q2 includes the 3rd metal-oxide-semiconductor K3
With the 4th metal-oxide-semiconductor K4.Wherein, the drain electrode of first metal-oxide-semiconductor is connected with the drain electrode of the second metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor with
The DO ends connection of first chip IC 1, the second metal-oxide-semiconductor grid is connected with the CO ends of the first chip IC 1；The leakage of 3rd metal-oxide-semiconductor
Pole is connected with the drain electrode of the 4th metal-oxide-semiconductor, and the grid of the 3rd metal-oxide-semiconductor is connected with the DO ends of the second chip IC 2, the 4th metal-oxide-semiconductor grid
It is connected with the CO ends of the second chip IC 2.
Wherein, metal-oxide-semiconductor can be n-channel metal-oxide-semiconductor or p-channel metal-oxide-semiconductor, and the metal-oxide-semiconductor used in the present embodiment is n-channel
Metal-oxide-semiconductor, chip (including the first chip IC 1 and the second chip IC 2) controls MOS by the height of DO ends or CO ends output level
The conducting and cut-off of pipe, specifically, for example, in protection is overcharged, with the progress of charging, battery core voltage gradually rises, and works as liter
Height to chip overcharge protection voltage when, the CO ends output low level of chip will corresponding switch OFF, charge circuit is also disconnected.Cross
Fill after protection, battery core voltage can decline, when drop to overcharge protection and recover voltage when, the CO ends of chip are recovered high level state and beaten
Open to inductive switch.
When metal-oxide-semiconductor is n-channel metal-oxide-semiconductor, the source electrode of the metal-oxide-semiconductor connects the relatively low point of level, for example, be grounded, in chip DO
When end or CO ends output high level, because the source ground of metal-oxide-semiconductor, and then the high voltage of the grid of metal-oxide-semiconductor can make metal-oxide-semiconductor
Drain electrode and source electrode between conducting be metal-oxide-semiconductor conducting, and then whole charge or discharge loop conducting (such as the present embodiment circuit diagram
Shown in 1).When metal-oxide-semiconductor is p-channel metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor should be connected with voltage and be exported more than chip DO ends and CO ends
High level, and then metal-oxide-semiconductor gate high-voltage can make between the drain electrode of metal-oxide-semiconductor and source electrode turn on.
Further, such as Fig. 1, in one embodiment, the core protection circuit D1 includes the electricity of first resistor R1 and first
Hold C1, the sub- protection circuit D2 includes second resistance R2 and the second electric capacity C2；
First resistor R1 one end connection battery core positive pole, the other end connect the vdd terminal of the first chip IC 1, described first
Electric capacity C1 one end connects the VSS ends that the vdd terminal of the first chip IC 1, the other end connect the first chip IC 1；
Second resistance R2 one end connection battery core positive pole, the other end connect the vdd terminal of the second chip IC 2, described second
Electric capacity C2 one end connects the vdd terminal of the second chip IC 2, and the other end connects the VSS ends of the second chip IC 1.
In the present embodiment, the ripple and interference voltage of R1 and C1 for eliminating charger input voltage, it can also be used to moment
Voltage stabilizing and filtering, in order to which the first chip IC 1 detects battery core voltage, R2 is identical with C2 effects, also allows for the second chip IC 2 and detects
Battery core voltage.
Further, in one embodiment, the battery protecting circuit also includes：First sampling resistor RS1 and second is adopted
Sample resistance RS2；
The first sampling resistor RS1 and the second sampling resistor RS2 in the present embodiment are used for current sampling, and chip passes through detection
Sampling resistor (RS1/RS2) both end voltage, voltage is converted to by the electric current for flowing through sampling resistor, is compared with the late value of setting
Compared with realizing excessively stream and short-circuit protection.
Wherein, two sampling resistor parallel connections, can mitigate the heating of single resistance, can also reduce the error of resistance, really
Protect the precision of sampling current.In one embodiment, sampling resistor can have the multiple of parallel connection.
Sampling resistor in the present embodiment is precision resistance.The first sampling resistor RS1 and the second sampling resistor RS2 are only
The core protection circuit D1 or sub- protection circuit D2 is stood on, i.e., ought have multiple core protection circuit D1 or son
During protection circuit D2, the first sampling resistor RS1 and the second sampling resistor RS2 quantity is not with core protection circuit D1 or son
The change of protection circuit D2 quantity and change.In the present embodiment, the whole battery protecting circuit includes one first sampling
A resistance RS1 and second sampling resistor RS2.
Wherein, the first sampling resistor RS1 mono- terminates battery core negative pole, the other end and connects the second sampling resistor RS2；
The other end that second sampling resistor RS2 deviates the first sampling resistor RS1 is connected with the source electrode of the 3rd metal-oxide-semiconductor；
The VSS ends of first chip IC 1 be connected to the second sampling resistor RS2 be inclined to the first sampling resistor RS1 one end,
RSENS ends are connected to one end that the second sampling resistor RS2 deviates the first sampling resistor RS1；
The RSENS ends of second chip IC 2 are connected to the second sampling resistor RS2 two ends, for detecting the second sampling resistor RS2
Both end voltage.
The setting of sampling resistor in the present embodiment, can provide excessively stream second-level protection function.Chip is by monitoring connection
Voltage difference between cell voltage between vdd terminal and VSS ends, and excessively stream, short-circuit detecting end and VSS ends is realized control charging and put
Electricity, this belongs to the first class of protection of battery protecting circuit, but when chip because failure or other reasonses cause first class of protection to fail
When, it is necessary to start second class protection.When detecting the current value for flowing through sampling resistor more than first threshold, controllable metal-oxide-semiconductor is opened
Shut-off, cutoff circuit electric current realizes the protection to battery core or battery.
Further, such as Fig. 1, in one embodiment, the core protection circuit D1 includes 3rd resistor R3, the sub- guarantor
Protection circuit D2 includes the 4th resistance R4；
The excessively stream of described 3rd resistor R3 one end and the first chip IC 1, short-circuit detecting end V- are connected, the other end and second
The source electrode connection of metal-oxide-semiconductor；
The excessively stream of described 4th resistance R4 one end and the second chip IC 2, short-circuit detecting end are connected V-, the other end and the 4th
The source electrode connection of metal-oxide-semiconductor, the source electrode of the first metal-oxide-semiconductor and the 4th resistance R4 are connected with the node that the 4th metal-oxide-semiconductor source electrode is connected.
3rd resistor R3 or the 4th resistance R4 in the present embodiment be used to light source of charger it is reversed when protection to battery.
Further, in one embodiment, the core protection circuit D1 includes the 3rd electric capacity C3, sub- protection circuit
D2 includes the 4th electric capacity C4；
The 3rd electric capacity C3 of the first metal-oxide-semiconductor group two ends parallel connection, the 4th electric capacity C4 of the second metal-oxide-semiconductor group two ends parallel connection.
Because electric capacity both end voltage can not be mutated, therefore electric capacity can play moment voltage stabilizing and filter action.First metal-oxide-semiconductor group and
Second metal-oxide-semiconductor group is switched as whole charging and discharging circuit, and in the moment for turning off or turning on, both end voltage can produce larger change
Change, the first metal-oxide-semiconductor group and the second metal-oxide-semiconductor group can most probably be impacted by transient overvoltage, and major injury is caused to metal-oxide-semiconductor.Cause
This is respectively connected in parallel with a capacitor at the first metal-oxide-semiconductor group two ends and the second metal-oxide-semiconductor group two ends, with prevent the first metal-oxide-semiconductor group two ends or
Second metal-oxide-semiconductor group both end voltage is mutated, it is to avoid metal-oxide-semiconductor is damaged.
Further, in one embodiment, the battery protecting circuit also includes：NTC thermistor and identification resistance；
Described NTC thermistor one end and 3rd resistor R3 are connected with the node that the second metal-oxide-semiconductor is connected, the other end is as electricity
Pond protection circuit output interface；
Described identification resistance one end and 3rd resistor R3 are connected with the node that the second metal-oxide-semiconductor is connected, the other end is as battery
Protection circuit output interface.
The effect of NTC thermistor：When battery works, do not overcharge, cross put or excessively stream, short circuit situations such as, and
It is due to that the working time is oversize, causes battery core temperature to rise (such as we do marathon talk on the phone with mobile phone usually) quickly.And NTC is electric
Battery core monitoring battery core temperature is close in resistance, is gradually reduced as temperature rises NTC resistances, electrical appliance CPU is found that this changes, when
When resistance decrease is to CPU setting values, CPU is to send shutdown command, allows battery to stop powering to it, and only maintain very little treats electromechanics
Stream, reaches the purpose of protection battery.Recognize that resistance supplies electrical appliance identification, exclude the battery not matched, can storage battery kind
The information such as class, date of manufacture, can play a part of reviewing and using limitation for product.
Such as composition structural representations of the Fig. 3 for the battery of the embodiment of the present invention.
The battery 100 includes：Battery core 101, battery protecting plate 102, the battery core 101 is connected with battery protecting plate 102,
Connected interface has embodied in the above-mentioned description to battery protecting circuit.The battery protecting plate 102 includes described above
Battery protecting circuit, because being described in detail above, therefore here is omitted.
Terminal of the embodiment of the present invention can be PC or smart mobile phone, tablet personal computer, E-book reader, MP3
(Moving Picture Experts Group Audio Layer III, dynamic image expert's compression standard audio aspect 3)
Player, MP4 (Moving Picture Experts Group Audio Layer IV, dynamic image expert's compression standard sound
Frequency aspect 3) player, pocket computer etc. have the packaged type terminal device of display function.
As shown in figure 4, the terminal can include：Battery 100 and charging inlet 200, the battery 100 and charging inlet
200 connections.
It will be understood by those skilled in the art that the battery or terminal structure that are shown in Fig. 3 or Fig. 4 not structure battery pair or
The restriction of terminal, can include than illustrating more or less parts, either combine some parts or different part cloth
Put.
It should be noted that the feature of each embodiment herein can be mutually combined to form new embodiment, because of feature
In above-detailed, therefore repeat no more.
Herein, term " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, from
And cause the process, method, article or the system that include a series of key elements not only to include those key elements, but also including not bright
Other key elements really listed, or also include for this process, method, article or the intrinsic key element of system.Do not having
In the case of more limitations, the key element limited by sentence "including a ...", it is not excluded that in the process including the key element, side
Also there is other identical element in method, article or system.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of battery protecting circuit, it is characterised in that the battery protecting circuit include core protection circuit and with the core
Heart protection circuit at least one sub- protection circuit in parallel；
The core protection circuit includes the first chip IC 1 and first switch group；The first switch group includes the first of concatenation
Switch and second switch, the DO ends of the first chip IC 1 are connected with first switch, CO ends are connected with second switch；
The sub- protection circuit includes the second chip IC 2 and second switch group；The second switch group includes the 3rd opening for concatenation
Close and the 4th switch, the DO ends of the second chip IC 2 are connected with the 3rd switch, CO ends are connected with the 4th switch.
2. battery protecting circuit as claimed in claim 1, it is characterised in that the first switch group is the first metal-oxide-semiconductor group, institute
Stating the first metal-oxide-semiconductor group includes the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, and the drain electrode of first metal-oxide-semiconductor connects with the drain electrode of the second metal-oxide-semiconductor
Connect, the grid of the first metal-oxide-semiconductor is connected with the DO ends of the first chip IC 1, the CO ends of the second metal-oxide-semiconductor grid and the first chip IC 1 connect
Connect；
The second switch group is the second metal-oxide-semiconductor group, and the second metal-oxide-semiconductor group includes the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, described
The drain electrode of 3rd metal-oxide-semiconductor is connected with the drain electrode of the 4th metal-oxide-semiconductor, and the grid of the 3rd metal-oxide-semiconductor is connected with the DO ends of the second chip IC 2,
4th metal-oxide-semiconductor grid is connected with the CO ends of the second chip IC 2.
3. battery protecting circuit as claimed in claim 1, it is characterised in that the core protection circuit includes first resistor R1
With the first electric capacity C1, the sub- protection circuit includes second resistance R2 and the second electric capacity C2；
First resistor R1 one end connection battery core positive pole, the other end connect the vdd terminal of the first chip IC 1, first electric capacity
C1 one end connects the VSS ends that the vdd terminal of the first chip IC 1, the other end connect the first chip IC 1；
Second resistance R2 one end connection battery core positive pole, the other end connect the vdd terminal of the second chip IC 2, second electric capacity
C2 one end connects the vdd terminal of the second chip IC 2, and the other end connects the VSS ends of the second chip IC 1.
4. battery protecting circuit as claimed in claim 1, it is characterised in that the sub- protection circuit also includes：Described second
The VSS ends ground connection of chip IC 2.
5. battery protecting circuit as claimed in claim 2, it is characterised in that the battery protecting circuit also includes：First adopts
Sample resistance RS1 and the second sampling resistor RS2；
First sampling resistor RS1 mono- termination battery cores negative pole, the other end connect the second sampling resistor RS2；
The other end that second sampling resistor RS2 deviates the first sampling resistor RS1 is connected with the source electrode of the 3rd metal-oxide-semiconductor；
The VSS ends of first chip IC 1 are connected to one end, the RSENS ends that the second sampling resistor RS2 is inclined to the first sampling resistor RS1
It is connected to one end that the second sampling resistor RS2 deviates the first sampling resistor RS1；
The RSENS ends of second chip IC 2 are connected to the second sampling resistor RS2 two ends, for detecting the second sampling resistor RS2 two ends
Voltage.
6. battery protecting circuit as claimed in claim 2, it is characterised in that the core protection circuit includes 3rd resistor
R3, the sub- protection circuit includes the 4th resistance R4；
The excessively stream of described 3rd resistor R3 one end and the first chip IC 1, short-circuit detecting end are connected, the other end and the second metal-oxide-semiconductor
Source electrode is connected；
The excessively stream of described 4th resistance R4 one end and the second chip IC 2, short-circuit detecting end are connected, the other end and the 4th metal-oxide-semiconductor
Source electrode is connected, and the source electrode of the first metal-oxide-semiconductor and the 4th resistance R4 are connected with the node that the 4th metal-oxide-semiconductor source electrode is connected.
7. battery protecting circuit as claimed in claim 2, it is characterised in that the core protection circuit includes the 3rd electricity
Hold C3, sub- protection circuit includes the 4th electric capacity C4；
The 3rd electric capacity C3 of the first metal-oxide-semiconductor group two ends parallel connection, the 4th electric capacity C4 of the second metal-oxide-semiconductor group two ends parallel connection.
8. battery protecting circuit as claimed in claim 2, it is characterised in that the battery protecting circuit also includes：NTC temperature-sensitives
Resistance and identification resistance；
The node that described NTC thermistor one end and 3rd resistor R3 are connected with the second metal-oxide-semiconductor is connected, the other end is protected as battery
Protection circuit output interface；
Described identification resistance one end and 3rd resistor R3 are connected with the node that the second metal-oxide-semiconductor is connected, the other end is as battery protection
Circuit output interface.
9. a kind of battery, it is characterised in that the battery include battery protecting circuit described in any one of claim 1 to 8 and
Battery core, the battery protecting circuit is connected with battery core.
10. a kind of terminal, it is characterised in that the terminal includes the battery described in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710773184.9A CN107332319A (en) | 2017-08-31 | 2017-08-31 | Battery protecting circuit, battery and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710773184.9A CN107332319A (en) | 2017-08-31 | 2017-08-31 | Battery protecting circuit, battery and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107332319A true CN107332319A (en) | 2017-11-07 |
Family
ID=60204085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710773184.9A Pending CN107332319A (en) | 2017-08-31 | 2017-08-31 | Battery protecting circuit, battery and terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107332319A (en) |
Cited By (9)
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| CN108832168A (en) * | 2018-06-21 | 2018-11-16 | 闻泰通讯股份有限公司 | Battery, battery charge-discharge circuit and electronic equipment |
| CN109494687A (en) * | 2018-12-11 | 2019-03-19 | 欣旺达电子股份有限公司 | Duplicate protection control circuit |
| CN109921487A (en) * | 2019-03-19 | 2019-06-21 | 深圳欣旺达智能科技有限公司 | The protection circuit and protective device in fast charge circuit |
| CN111817396A (en) * | 2020-07-20 | 2020-10-23 | 天能帅福得能源股份有限公司 | Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate |
| WO2021063288A1 (en) * | 2019-09-30 | 2021-04-08 | 深圳市道通科技股份有限公司 | Battery and automotive diagnostic tablet |
| CN114243870A (en) * | 2022-02-23 | 2022-03-25 | 荣耀终端有限公司 | Over-discharge protection circuit, battery protection board and electronic equipment |
| CN114256939A (en) * | 2022-02-25 | 2022-03-29 | 荣耀终端有限公司 | Over-discharge protection circuit, battery protection board and electronic equipment |
| CN114336531A (en) * | 2022-03-09 | 2022-04-12 | 荣耀终端有限公司 | Leakage protection circuit and electronic device |
| CN117110913A (en) * | 2023-10-13 | 2023-11-24 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108832168A (en) * | 2018-06-21 | 2018-11-16 | 闻泰通讯股份有限公司 | Battery, battery charge-discharge circuit and electronic equipment |
| CN109494687A (en) * | 2018-12-11 | 2019-03-19 | 欣旺达电子股份有限公司 | Duplicate protection control circuit |
| CN109921487A (en) * | 2019-03-19 | 2019-06-21 | 深圳欣旺达智能科技有限公司 | The protection circuit and protective device in fast charge circuit |
| WO2021063288A1 (en) * | 2019-09-30 | 2021-04-08 | 深圳市道通科技股份有限公司 | Battery and automotive diagnostic tablet |
| CN111817396A (en) * | 2020-07-20 | 2020-10-23 | 天能帅福得能源股份有限公司 | Circuit for simultaneously closing charging and discharging metal-oxide-semiconductor field effect transistors (MOSFETs) during high-temperature detection of protection plate |
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| CN114336531A (en) * | 2022-03-09 | 2022-04-12 | 荣耀终端有限公司 | Leakage protection circuit and electronic device |
| CN117110913A (en) * | 2023-10-13 | 2023-11-24 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
| CN117110913B (en) * | 2023-10-13 | 2024-04-05 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
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