CN114552538B - Battery protection system with load turn-off function and lithium battery - Google Patents
Battery protection system with load turn-off function and lithium battery Download PDFInfo
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- CN114552538B CN114552538B CN202210251017.9A CN202210251017A CN114552538B CN 114552538 B CN114552538 B CN 114552538B CN 202210251017 A CN202210251017 A CN 202210251017A CN 114552538 B CN114552538 B CN 114552538B
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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
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- 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
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- 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
- H02J7/00308—Overvoltage protection
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- 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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- 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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
- H02J7/0032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
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- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery protection system with a load turn-off function and a lithium battery, which comprise a protection control circuit, a drive circuit, a first transistor, a load circuit and a pull-up module, wherein the drive circuit is connected with the pull-up module; the first end of the protection control circuit is connected with the anode of the battery, the second end of the protection control circuit is connected with the cathode of the battery, the output end of the protection control circuit is connected with the input end of the driving circuit, the first end of the pull-up module is connected with a reference voltage, the second end of the pull-up module is connected with the control end of the protection control circuit, the third end of the pull-up module is connected with the second end of the first transistor, the control end of the pull-up module is connected with the second output end of the load circuit, and the pull-up module is used for transmitting the reference voltage to the control end of the protection control circuit when the second output end of the load circuit outputs a trigger signal so as to control the first transistor to be turned off. The technical scheme provided by the invention can turn off the load under the condition that the battery is in standby or unused for a long time so as to reduce the power consumption of the system.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a battery protection system with a load turn-off function and a lithium battery.
Background
With the rapid development of the technology, products such as mobile phones, electronic cigarettes, mobile power sources, TWS (true wireless stereo) earphones, smart wristbands and watches, which take lithium batteries as power supply devices, are popularized and are increasingly popular with users.
A battery system typically includes a battery and a battery protection circuit. In current electronic products, especially in battery miniaturization applications such as electronic cigarettes, TWS, smart band watches, and the like, under the condition that the battery is not used for a long time, the battery protection circuit also consumes current, resulting in a reduction in battery voltage and an influence on battery life. Lead to battery voltage to reduce to below the over-discharge protection voltage easily when long-time, long-distance transportation, when battery system restarts, need charge for a long time the battery just can use, influence customer's experience effect.
Disclosure of Invention
The invention provides a battery protection system with a load turn-off function and a lithium battery, which are used for reducing the self-power consumption phenomenon of the battery protection system and improving the user experience effect.
According to an aspect of the present invention, there is provided a battery protection system having a load turn-off function, including a protection control circuit, a driving circuit, a first transistor, a load circuit, and a pull-up module;
the first end of the protection control circuit is connected with the positive electrode of a battery, the second end of the protection control circuit is connected with the negative electrode of the battery, the output end of the protection control circuit is connected with the input end of the driving circuit, the first output end of the driving circuit is connected with the control end of the first transistor, the first end of the first transistor is connected with the negative electrode of the battery, the second end of the first transistor is connected with the first output end of the load circuit, and the input end of the load circuit is connected with the positive electrode of the battery;
the first end of the pull-up module is connected with a reference voltage, the second end of the pull-up module is connected with the control end of the protection control circuit, the third end of the pull-up module is connected with the second end of the first transistor, the control end of the pull-up module is connected with the second output end of the load circuit, and the pull-up module is used for transmitting the reference voltage to the control end of the protection control circuit when the second output end of the load circuit outputs a trigger signal so as to control the first transistor to be turned off.
Optionally, the protection control circuit includes a discharge overcurrent protection unit;
a first input end of the discharge overcurrent protection unit is connected with a reference overcurrent voltage, a second input end of the discharge overcurrent protection unit is connected with a second end of the pull-up module, and an output end of the discharge overcurrent protection unit is connected with an input end of the drive circuit;
the reference voltage is greater than the reference overcurrent voltage.
Optionally, the pull-up module includes a switch unit and a voltage dividing unit;
the first end of the switch unit is connected to the reference voltage, the second end of the switch unit is connected to the control end of the protection control circuit and the first end of the voltage dividing unit, the control end of the switch unit is connected to the second output end of the load circuit, and the second end of the voltage dividing unit is connected to the second end of the first transistor.
Optionally, the voltage dividing unit includes a first resistor, the switching unit includes a second transistor, and a control terminal of the second transistor is connected to the second output terminal of the load circuit.
Optionally, the battery protection system with the load turn-off function further includes a first filter circuit, a first end of the first filter circuit is connected to the positive electrode of the battery, a second end of the first filter circuit is connected to the first end of the protection control circuit, and a third end of the first filter circuit is connected to the negative electrode of the battery.
Optionally, a first terminal of the switch unit is connected to the positive electrode of the battery, or a first terminal of the switch unit is connected to the second terminal of the first filter circuit.
Optionally, the first filter circuit includes a second resistor and a first capacitor, a first end of the second resistor is connected to the positive electrode of the battery, a second end of the second resistor is connected to the first electrode of the first capacitor, a second electrode of the first capacitor is connected to the negative electrode of the battery, and a first end of the protection control circuit is connected to a second end of the second resistor.
Optionally, the circuit further comprises a second filter circuit, wherein the second filter circuit comprises a third resistor and a second capacitor;
the first end of the third resistor is connected with the control end of the pull-up module, the second end of the third resistor is connected with the second output end of the load circuit, the first pole of the second capacitor is connected with the first end of the third resistor, and the second pole of the second capacitor is connected with the first output end of the load circuit.
Optionally, the load circuit further comprises a third transistor, a control terminal of the third transistor is connected to the second output terminal of the driving circuit, a first terminal of the third transistor is connected to the second terminal of the first transistor, and a second terminal of the third transistor is connected to the first output terminal of the load circuit;
the charging circuit is connected between the positive pole and the negative pole of the battery.
According to another aspect of the present invention, a lithium battery is provided, which includes the battery protection system with load shutdown function provided in any embodiment of the present invention.
According to the technical scheme provided by the embodiment of the invention, under the condition that the battery is in a standby state or is not used for a long time, the load circuit outputs a trigger signal to the control end of the pull-up module, the pull-up module pulls up the voltage of the control end of the protection control circuit under the action of the trigger signal, so that the protection control circuit enters a protection state, the drive circuit controls the first transistor to be switched off, the load circuit does not work, and the load does not consume current due to the switching off of the load, so that the power consumption of a system can be reduced. When the battery charger is used again, the battery charger can be normally used only by being connected with the charger and activated, and the battery does not need to be charged for a long time, so that the use effect of a user is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a protection control circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a battery protection system with a load shutdown function according to an embodiment of the present invention, and referring to fig. 1, the battery protection system with a load shutdown function according to an embodiment of the present invention includes: the protection control circuit 10, the driving circuit 20, the first transistor M1, the load circuit 40 and the pull-up module 30; a first end A1 of the protection control circuit 10 is connected with the positive electrode of the battery, a second end A2 of the protection control circuit 10 is connected with the negative electrode of the battery, an output end A3 of the protection control circuit 10 is connected with an input end B1 of the driving circuit 20, a first output end B2 of the driving circuit 20 is connected with a control end of a first transistor M1, a first end of the first transistor M1 is connected with the negative electrode of the battery, a second end of the first transistor M1 is connected with a first output end F2 of the load circuit 40, and an input end F1 of the load circuit 40 is connected with the positive electrode of the battery; the first end D1 of the pull-up module 30 is connected to a reference voltage VREF, the second end D2 of the pull-up module 30 is connected to the control end A4 of the protection control circuit 10, the third end D3 of the pull-up module 30 is connected to the second end of the first transistor M1, the control end D4 of the pull-up module 30 is connected to the second output end F3 of the load circuit 40, and the pull-up module 30 is configured to transmit the reference voltage VREF to the control end A4 of the protection control circuit 10 when the second output end F3 of the load circuit 40 outputs the trigger signal TSC, so as to control the first transistor M1 to be turned off.
Specifically, the battery protection system comprises a battery and a battery protection circuit, wherein the anode of the battery is used as the positive output terminal P + of the battery protection system, the second terminal of the first transistor M1 is used as the negative output terminal P-of the battery protection system, the first transistor M1 is connected in series between the negative output terminal P-and the negative electrode of the battery, and the protection control circuit 10, the driving circuit 20, the pull-up module 30 and the first transistor M1 form the battery protection circuit to protect the battery against overvoltage, overcurrent and the like.
The load circuit 40 may include a load and a signal control unit, wherein the load is used for forming a discharge path with the positive electrode and the negative electrode of the battery. The protection control circuit 10 is a basic protection circuit of the battery, for example, the protection control circuit 10 can provide discharge overcurrent protection, discharge overvoltage protection, short-circuit protection, charge overcurrent protection, charge overvoltage protection, and the like for the battery, and the protection control circuit 10 sends a protection control signal to the driving circuit 20, so that the driving circuit 20 turns off the first transistor M1, thereby closing the load circuit 40, so that a discharge path of the battery is cut off, and the battery is effectively protected. The load circuit 40 is also configured to output a trigger signal TSC, which may be a signal output by the load circuit 40 when the load is turned off and the protection control circuit 10 is not over-current protecting the battery.
Illustratively, when the battery is in the normal operation mode, the second output terminal F3 of the load circuit 40 does not output the trigger signal TSC, the pull-up module 30 transmits the voltage of the output negative terminal P-to the control terminal A4 of the protection control circuit 10, and the protection control circuit 10 operates normally. When the system enters a standby state or is not used for a long time in a shipping mode, the load circuit 40 outputs a trigger signal TSC to the control end D4 of the pull-up module 30, the pull-up module 30 transmits the reference voltage VREF of the first end D1 to the control end A4 of the protection control circuit 10 under the control of the trigger signal TSC, so that the potential of the control end A4 of the protection control circuit 10 is increased, the protection control circuit 10 enters a protection state, the first transistor M1 is controlled to be turned off by the drive circuit 20, the negative electrode of the battery is disconnected with the output negative end P-of the system, and the load circuit 40 does not work, so that the load does not consume current, the voltage of the battery is ensured not to be reduced, and the stable voltage value can be maintained for a long time. During the load turn-off period, the battery protection circuit can be turned off or not, and can be set according to actual requirements. When the battery charger is used again, the battery charger can be normally used only by being connected with the charger and activated, and the battery does not need to be charged for a long time, so that the use effect of a user is improved.
According to the technical scheme provided by the embodiment of the invention, under the condition that the battery is in a standby state or is not used for a long time, the load circuit outputs a trigger signal to the control end of the pull-up module, the pull-up module pulls up the voltage of the control end of the protection control circuit under the action of the trigger signal, so that the protection control circuit enters a protection state, the drive circuit controls the first transistor to be switched off, the load circuit does not work, and the load does not consume current due to the switching off of the load, so that the power consumption of a system can be reduced. When the battery charger is used again, the battery charger can be normally used only by being connected with the charger and activated, and the battery does not need to be charged for a long time, so that the use effect of a user is improved.
Fig. 2 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention, and referring to fig. 2, on the basis of the foregoing technical solution, optionally, the protection control circuit 10 includes a discharge overcurrent protection unit 101; a first input end a1 of the discharging overcurrent protection unit 101 is connected to the reference overcurrent voltage VOC1, a second input end a2 of the discharging overcurrent protection unit 101 is connected to a second end D2 of the pull-up module 30, and an output end a3 of the discharging overcurrent protection unit 101 is connected to an input end B1 of the driving circuit 20.
Specifically, the discharge overcurrent protection unit 101 serves as a protection unit in the protection control circuit 10, and is used for overcurrent protection of the battery when discharge overcurrent occurs in the battery. Illustratively, the discharging overcurrent protection unit 101 may include a discharging overcurrent comparator, wherein a non-inverting input terminal of the discharging overcurrent comparator is connected as a first input terminal a1 of the discharging overcurrent protection unit 101 to the reference overcurrent voltage VOC1, and the reference overcurrent voltage VOC1 may be provided by a reference voltage module in the protection control circuit 10; the negative phase input end of the discharging overcurrent comparator is used as a second input end a2 of the discharging overcurrent protection unit 101 and is connected with a second end D2 of the pull-up module 20; the output end of the discharging overcurrent comparator is connected as the output end a3 of the discharging overcurrent protection unit 101 to the input end B1 of the driving circuit 20. When the battery is in a normal operation mode, since the load circuit 40 has no trigger signal TSC output, the pull-up module 30 transmits the voltage of the negative terminal P-of the system output to the second input terminal a2 of the discharge overcurrent protection unit 101, and the voltage of the negative terminal P-of the output is lower than the reference overcurrent voltage VOC1, so that the discharge overcurrent protection unit 101 outputs a high level signal, the driving circuit 20 controls the first transistor M1 to be turned on according to the high level signal, and the protection control circuit 10 operates normally.
When the load needs to be turned off, the load circuit 40 outputs the trigger signal TSC to the control terminal D4 of the pull-up module 30, and the pull-up module 30 transmits the reference voltage VREF of the first terminal D1 to the second input terminal a2 of the discharging overcurrent protection unit 101 according to the received trigger signal TSC, where the reference voltage VREF may be a battery voltage, or obtained by converting the battery voltage, or may be an external power voltage. In this embodiment, the reference voltage VREF is greater than the reference overcurrent voltage VOC1, the discharging overcurrent protection unit 101 outputs a low level signal, the driving circuit 20 controls the first transistor M1 to turn off according to the low level signal, the protection control circuit 10 operates in a discharging overcurrent protection state, the first output terminal F2 of the load circuit 40 is disconnected from the negative electrode of the battery, the load circuit 40 does not operate, and the battery protection system does not output current, so that the load does not consume current, which is beneficial to reducing the power consumption of the system.
It should be noted that the protection control circuit 10 further includes other protection circuits, and the battery is used for providing power supply voltage for the protection circuits in the protection control circuit 10.
Fig. 3 is a schematic structural diagram of another battery protection system with a load turn-off function according to an embodiment of the present invention, and referring to fig. 3, on the basis of the foregoing technical solution, optionally, the pull-up module 30 includes a switch unit 301 and a voltage dividing unit 302. A first end b1 of the switch unit 301 is connected to the reference voltage VREF, a second end b2 of the switch unit 301 is connected to the control end A4 of the protection control circuit 10 and the first end c1 of the voltage dividing unit 302, respectively, a control end b3 of the switch unit 301 is connected to the second output end F3 of the load circuit 40, and a second end c2 of the voltage dividing unit 302 is connected to the second end of the first transistor M1.
Specifically, the switching unit 301 is configured to transmit the reference voltage VREF to the control terminal A4 of the protection control circuit 10 according to the conduction of the trigger signal TSC output by the load circuit 40 when the load needs to be turned off, so as to trigger the over-current protection function of the protection control circuit 10. As an optional implementation manner of the embodiment of the present invention, fig. 4 is a schematic structural diagram of another battery protection system with a load shutdown function according to the embodiment of the present invention, and specifically illustrates a specific structure of the pull-up module 30. Referring to fig. 4, the voltage dividing unit 302 includes a first resistor R1, the switching unit 301 includes a second transistor M2, a control terminal of the second transistor M2 is connected to the second output terminal F3 of the load circuit 40, a first terminal of the second transistor M2 is connected to the reference voltage VREF, a second terminal of the second transistor M2 is connected to the first terminal of the first resistor R1, a second terminal of the first resistor R1 is connected to the second terminal of the first transistor M1, and a control terminal A4 of the protection control circuit 10 is connected to the second terminal of the second transistor M2.
When the battery is in the normal operation mode, since the load circuit 40 does not have the trigger signal TSC output, the second transistor M2 cannot be turned on, and the reference voltage VREF is not transmitted to the control terminal A4 of the protection control circuit 10. The output negative terminal P-of the system is connected to the control terminal A4 of the protection control circuit 10 through the first resistor R1, and the battery protection system works normally.
When the load needs to be turned off, a trigger signal TSC is output through the load circuit 40, the second transistor M2 is turned on under the action of the trigger signal TSC, since the reference voltage VREF is at a high level, under the pull-up action of the second transistor M2, the potential of the control end A4 of the protection control circuit 10 is pulled high, the discharge overcurrent protection unit 101 enters a discharge overcurrent protection state and outputs a low level signal to the input end B1 of the driving circuit 20, and the driving circuit 20 controls the first transistor M1 to be turned off, so that the connection between the load circuit and the negative pole of the battery is turned off, the load is turned off, and the load does not consume current, so as to ensure that the voltage of the battery does not drop.
Fig. 5 is a schematic structural diagram of another battery protection system with a load turn-off function according to an embodiment of the present invention, referring to fig. 5, based on the above technical solution, optionally, the battery protection system with a load turn-off function according to an embodiment of the present invention further includes a first filter circuit 50, a first end E1 of the first filter circuit 50 is connected to a positive electrode of the battery, a second end E2 of the first filter circuit 50 is connected to a first end A1 of the protection control circuit 10, and a third end E3 of the first filter circuit 50 is connected to a negative electrode of the battery.
Specifically, the first filter circuit 50 is disposed on the battery side for voltage conversion and filtering of the voltage output from the battery. The first filter circuit 50 includes a second resistor R2 and a first capacitor C1, a first end of the second resistor R2 is connected to the positive electrode of the battery, a second end of the second resistor R2 is connected to a first pole of the first capacitor C1, a second pole of the first capacitor C1 is connected to the negative electrode of the battery, and a first end A1 of the protection control circuit 10 is connected to a second end of the second resistor R2. The second resistor R2 is a divided voltage for converting the battery voltage into the power supply voltage VDD to supply power to the protection control circuit 10. The first capacitor C1 is a filter capacitor, and is used for filtering the voltage divided by the second resistor R2.
Alternatively, as shown in fig. 5, in the present embodiment, the first terminal b1 of the switching unit 301 is connected to the positive electrode of the battery, and the reference voltage VREF is equal to the battery voltage. Certainly, the first end b1 of the switch unit 301 may also be connected to another power source, for example, fig. 6 is a schematic structural diagram of another battery protection system with a load turn-off function according to an embodiment of the present invention, referring to fig. 6, the first end b1 of the switch unit 301 is connected to the second end E2 of the first filter circuit 50, the reference voltage VREF is equal to the power voltage VDD, and the working principle of the battery protection system may refer to the above description and is not described again.
Fig. 7 is a schematic structural diagram of another battery protection system with a load turn-off function according to an embodiment of the present invention, and referring to fig. 7, on the basis of the foregoing technical solutions, the battery protection system further includes a second filter circuit 60, where the second filter circuit 60 includes a third resistor R3 and a second capacitor C2; a first end of the third resistor R3 is connected to the control end D4 of the pull-up module 30, a second end of the third resistor R3 is connected to the second output end F3 of the load circuit 40, a first pole of the second capacitor C2 is connected to the first end of the third resistor R3, and a second pole of the second capacitor C2 is connected to the first output end F2 of the load circuit 40.
Specifically, the second filter circuit 60 is configured to filter the trigger signal TSC output by the load circuit 40, and function as a delay switch, and at the same time, protect the control terminal of the second transistor M2 from being damaged by high voltage. The third resistor R3 is a current-limiting resistor, and the second capacitor C2 is a filter capacitor.
Fig. 8 is a schematic structural diagram of another battery protection system with a load shutdown function according to an embodiment of the present invention, and referring to fig. 8, on the basis of the foregoing technical solutions, the battery protection system further includes a charging circuit 70, the charging circuit 70 is connected between a positive electrode and a negative electrode of the battery, and the charging circuit 70 may include a charger for charging the battery. The charge and discharge states of the battery may be switched between the charging circuit 70 and the load circuit by a state switching device (not shown).
With continued reference to fig. 8, the battery protection system further includes a third transistor M3, a control terminal of the third transistor M3 is connected to the second output terminal B3 of the driving circuit 20, a first terminal of the third transistor M3 is connected to the second terminal of the first transistor M1, and a second terminal of the third transistor M3 is connected to the first output terminal F2 of the load circuit 40. At this time, the positive electrode of the battery serves as the positive output terminal P + of the battery protection system, the second terminal of the third transistor M3 serves as the negative output terminal P-of the battery protection system, and the other structures are the same as those in fig. 7. In this embodiment, since the first transistor M1 and the third transistor M3 are included at the same time (the first transistor M1 and the third transistor M3 may form a switch unit together), the battery protection system at this time is a discrete battery protection system, the control terminals of the first transistor M1 and the third transistor M3 are respectively connected to two output terminals of the driving circuit 20, and the load is cut off by controlling the first transistor M1 and the third transistor M3 to be turned off, the working process of which is the same as the above-mentioned working process, and details are not described here.
Optionally, fig. 9 is a schematic structural diagram of a protection control circuit according to an embodiment of the present invention, and with reference to fig. 7 and fig. 9, the protection control circuit 10 includes a reference circuit 110, a delay circuit 120, and a basic protection circuit, and the basic protection circuit includes a discharge overcurrent protection circuit (discharge overcurrent protection unit), a discharge short-circuit protection circuit, a charge overcurrent protection circuit, an overdischarge voltage protection circuit, an overcharge voltage protection circuit, and a charge and discharge detection circuit. The discharging overcurrent protection circuit comprises a first comparator VC1, a positive phase input end of the first comparator VC1 is connected with a reference overcurrent voltage VOC1, a negative phase input end of the first comparator VC1 is connected with a reference voltage VREF, when the reference overcurrent voltage VOC1 is lower than the reference voltage VREF, the discharging overcurrent protection circuit enters a discharging overcurrent protection state, the first comparator VC1 outputs a low-level discharging overcurrent judgment signal VOC1P, the discharging overcurrent judgment signal VOC1P is transmitted to the driving circuit 20 after being delayed by the delay circuit 120, and the driving circuit 20 controls the first transistor M1 to be turned off, so that a load is turned off.
The discharge short-circuit protection circuit includes a second comparator VC2, when the short-circuit detection voltage VSHORT is lower than the reference voltage VREF, the protection control circuit 10 operates in a discharge short-circuit protection state, the second comparator VC2 outputs a discharge short-circuit determination signal vshorp, and controls the driving circuit 20 to turn off the first transistor M1 after passing through the delay circuit 120. In this embodiment, the discharge overcurrent protection and the discharge short-circuit protection can be performed independently by reasonably configuring the reference voltage VREF, the short-circuit detection voltage VSHORT, and the reference overcurrent voltage VOC 1.
The over-discharge voltage protection circuit comprises a fourth comparator VC4, when the discharge voltage VRODV is lower than the over-discharge detection voltage VODV, the fourth comparator VC4 outputs a low-level over-discharge voltage determination signal VODVP, and the over-discharge voltage determination signal VODVP controls the driving circuit 20 to turn off the first transistor T1 after being delayed by the delay circuit 120, so that the battery stops discharging, and the system enters an over-discharge voltage protection state.
The charging over-current protection circuit comprises a third comparator VC3, the charging over-voltage protection circuit comprises a fifth comparator VC5, and the charging over-current protection circuit and the charging over-voltage protection circuit are used for judging whether the battery is over-charged in the charging process. In the process of charging the battery, when the voltage at the control end A4 of the protection control circuit 10 (i.e., the voltage divided by the first voltage R1 and the negative end P of the system output) is higher than the charging overcurrent detection voltage VCHOC, the third comparator VC3 outputs a high-level charging overcurrent determination signal VCHOC1, and the system is in a charging overcurrent protection state. When the charging voltage VROCV output after the power voltage VDD is divided by the sixth resistor R6 and the seventh resistor R7 is greater than the overcharge detection voltage VOCV, the fifth comparator VC5 outputs a low-level overcharge voltage determination signal VOCVP, and the overcharge voltage determination signal VOCVP controls the driving circuit 20 to turn off the first transistor M1 after passing through the delay circuit 120, so that the system enters an overcharge protection state and stops charging the battery.
The charge and discharge detection circuit comprises a sixth comparator VC6, a positive phase input end of the sixth comparator VC6 is connected with a second end of an eighth resistor R8, a negative phase input end of the sixth comparator VC6 is connected with a control end A4 of the protection control circuit 10, and the charge and discharge detection circuit is used for controlling the charge and discharge of the battery according to the voltage of the control end A4 of the protection control circuit 10. In this embodiment, the control terminal A4 of the protection control circuit 10 is connected to the input terminal of each comparator through the fifth resistor R5, and plays a role of current limiting.
Optionally, the present invention further provides a lithium battery, including the battery protection system with a load shutdown function provided in any embodiment of the present invention, where the battery protection system with a load shutdown function may be packaged together with the lithium battery in a chip form, and therefore, the lithium battery also has the beneficial effects described in any embodiment above.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A battery protection system with a load turn-off function is characterized by comprising a protection control circuit, a driving circuit, a first transistor, a load circuit and a pull-up module;
the first end of the protection control circuit is connected with the positive electrode of a battery, the second end of the protection control circuit is connected with the negative electrode of the battery, the output end of the protection control circuit is connected with the input end of the driving circuit, the first output end of the driving circuit is connected with the control end of the first transistor, the first end of the first transistor is connected with the negative electrode of the battery, the second end of the first transistor is connected with the first output end of the load circuit, and the input end of the load circuit is connected with the positive electrode of the battery;
a first end of the pull-up module is connected with a reference voltage, a second end of the pull-up module is connected with a control end of the protection control circuit, a third end of the pull-up module is connected with a second end of the first transistor, the control end of the pull-up module is connected with a second output end of the load circuit, and the pull-up module is used for transmitting the reference voltage to the control end of the protection control circuit when the second output end of the load circuit outputs a trigger signal so as to control the first transistor to be turned off;
the pull-up module comprises a switch unit and a voltage division unit;
the first end of the switch unit is connected to the reference voltage, the second end of the switch unit is connected to the control end of the protection control circuit and the first end of the voltage dividing unit, the control end of the switch unit is connected to the second output end of the load circuit, and the second end of the voltage dividing unit is connected to the second end of the first transistor.
2. The battery protection system with a load shutdown function according to claim 1, wherein the protection control circuit includes a discharge overcurrent protection unit;
a first input end of the discharge overcurrent protection unit is connected with a reference overcurrent voltage, a second input end of the discharge overcurrent protection unit is connected with a second end of the pull-up module, and an output end of the discharge overcurrent protection unit is connected with an input end of the drive circuit;
the reference voltage is greater than the reference overcurrent voltage.
3. The battery protection system with a load shutdown function according to claim 1, wherein the voltage dividing unit includes a first resistor, the switching unit includes a second transistor, and a control terminal of the second transistor is connected to the second output terminal of the load circuit.
4. The battery protection system with a load shutdown function according to claim 1, further comprising a first filter circuit, wherein a first end of the first filter circuit is connected to a positive electrode of the battery, a second end of the first filter circuit is connected to a first end of the protection control circuit, and a third end of the first filter circuit is connected to a negative electrode of the battery.
5. The battery protection system with a load shutdown function according to claim 4, wherein a first terminal of the switching unit is connected to a positive electrode of the battery, or a first terminal of the switching unit is connected to a second terminal of the first filter circuit.
6. The battery protection system with a load shutdown function according to claim 4, wherein the first filter circuit includes a second resistor and a first capacitor, a first end of the second resistor is connected to a positive electrode of the battery, a second end of the second resistor is connected to a first electrode of the first capacitor, a second electrode of the first capacitor is connected to a negative electrode of the battery, and a first end of the protection control circuit is connected to a second end of the second resistor.
7. The battery protection system with a load shutdown function according to claim 1, further comprising a second filter circuit, the second filter circuit including a third resistor and a second capacitor;
the first end of the third resistor is connected with the control end of the pull-up module, the second end of the third resistor is connected with the second output end of the load circuit, the first pole of the second capacitor is connected with the first end of the third resistor, and the second pole of the second capacitor is connected with the first output end of the load circuit.
8. The battery protection system with a load shutdown function according to claim 1, further comprising a third transistor, a control terminal of the third transistor being connected to the second output terminal of the driver circuit, a first terminal of the third transistor being connected to the second terminal of the first transistor, and a second terminal of the third transistor being connected to the first output terminal of the load circuit;
the charging circuit is connected between the positive pole and the negative pole of the battery.
9. A lithium battery comprising a battery protection system with load shutdown as claimed in any one of claims 1 to 8.
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| CN202210251017.9A CN114552538B (en) | 2022-03-15 | 2022-03-15 | Battery protection system with load turn-off function and lithium battery |
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| CN202210251017.9A CN114552538B (en) | 2022-03-15 | 2022-03-15 | Battery protection system with load turn-off function and lithium battery |
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| CN114552538B true CN114552538B (en) | 2023-03-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11127543A (en) * | 1997-10-23 | 1999-05-11 | Toshiba Electronic Engineering Corp | Protective circuit device for secondary battery |
| CN202721471U (en) * | 2012-07-31 | 2013-02-06 | Tcl集团股份有限公司 | Mobile battery box |
| CN111817261A (en) * | 2020-09-09 | 2020-10-23 | 苏州赛芯电子科技有限公司 | Self-recovery lithium battery protection circuit and device |
| CN212909028U (en) * | 2020-07-17 | 2021-04-06 | 福建飞毛腿动力科技有限公司 | Lithium battery protection circuit with low standby power consumption |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218536A (en) * | 2013-05-29 | 2014-12-17 | 株式会社理光 | Rechargeable battery protector |
| TWI620391B (en) * | 2016-12-23 | 2018-04-01 | 茂達電子股份有限公司 | Switching charging circuit |
| JP7458326B2 (en) * | 2018-12-17 | 2024-03-29 | ヌヴォトンテクノロジージャパン株式会社 | Battery monitoring control circuit |
| CN213243575U (en) * | 2020-07-30 | 2021-05-18 | 浙江阿尔郎科技有限公司 | Battery protection circuit |
-
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- 2022-03-15 CN CN202210251017.9A patent/CN114552538B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11127543A (en) * | 1997-10-23 | 1999-05-11 | Toshiba Electronic Engineering Corp | Protective circuit device for secondary battery |
| CN202721471U (en) * | 2012-07-31 | 2013-02-06 | Tcl集团股份有限公司 | Mobile battery box |
| CN212909028U (en) * | 2020-07-17 | 2021-04-06 | 福建飞毛腿动力科技有限公司 | Lithium battery protection circuit with low standby power consumption |
| CN111817261A (en) * | 2020-09-09 | 2020-10-23 | 苏州赛芯电子科技有限公司 | Self-recovery lithium battery protection circuit and device |
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