CN111817261B - Self-recovery lithium battery protection circuit and device - Google Patents

Self-recovery lithium battery protection circuit and device Download PDF

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Publication number
CN111817261B
CN111817261B CN202010939938.5A CN202010939938A CN111817261B CN 111817261 B CN111817261 B CN 111817261B CN 202010939938 A CN202010939938 A CN 202010939938A CN 111817261 B CN111817261 B CN 111817261B
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transistor
circuit
pole
electrically connected
gate
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CN111817261A (en
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蒋锦茂
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Suzhou Saixin Electronic Technology Co.,Ltd.
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Suzhou Saixin Electronic Technology Co ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The embodiment of the invention discloses a self-recovery lithium battery protection circuit and a device, wherein the protection circuit comprises a protection control circuit, a load resistor, a pull-down resistor, a first transistor, a first switch, a second switch, a third switch and a charger; the protection control circuit includes: the device comprises a reference circuit, a discharge short-circuit judging circuit, a discharge overcurrent judging circuit, a short-circuit recovery detecting circuit, a time delay circuit, a first signal output circuit and a driving circuit; the short circuit recovery detection circuit is used for controlling the drive circuit to conduct the first transistor according to the recovery condition after the protection control circuit enters a discharge overcurrent or discharge short circuit protection state. The self-recovery lithium battery protection circuit provided by the embodiment of the invention can recover to a normal discharge state according to the discharge voltage after the protection control circuit enters a discharge short circuit protection state or a discharge overcurrent protection state, and the lithium battery does not need to be charged and activated, so that the use effect of a user is greatly improved.

Description

Self-recovery lithium battery protection circuit and device
Technical Field
The embodiment of the invention relates to the technical field of battery charging and discharging, in particular to a self-recovery lithium battery protection circuit and device.
Background
With the progress of science and technology, lithium batteries have become popular as power supply devices for electronic products such as mobile phones, electronic cigarettes, mobile power sources, TWS (true wireless stereo) earphones, smart wristbands, watches, and the like. However, the chemical characteristics of the lithium battery are active, so that the lithium battery is prone to phenomena such as too high charging voltage, too large discharging current or short circuit during charging and discharging.
In the discharging process of the lithium battery in the prior art, if a large current is loaded, namely the battery protection circuit judges that the load current is too large, the battery protection circuit can enter a discharging overcurrent or discharging short circuit protection state, so that the lithium battery can not continue to discharge with the large current. When the load is removed, the lithium battery cannot automatically recover to a normal working state, and the lithium battery cannot recover to the normal working state only by charging activation, so that the use is inconvenient.
Disclosure of Invention
The embodiment of the invention provides a self-recovery lithium battery protection circuit and a device, which are used for realizing that the lithium battery protection circuit can automatically recover to a normal working state after entering a discharge overcurrent or short-circuit state.
In a first aspect, an embodiment of the present invention provides a self-recovery lithium battery protection circuit, including: the protection control circuit, the load resistor, the pull-down resistor, the first transistor, the first switch, the second switch, the third switch and the charger are connected; a first end of the first switch is electrically connected with a positive electrode of a lithium battery, a second end of the first switch is connected with a first end of the load resistor, a second end of the load resistor is electrically connected with a first electrode of the first transistor, and a second electrode of the first transistor is electrically connected with a negative electrode of the lithium battery; the first end of the pull-down resistor is connected with the first pole of the first transistor, the grid electrode of the first transistor is electrically connected with the driving signal output end of the protection control circuit, and the second end of the pull-down resistor is connected to the negative electrode of the lithium battery through the second switch; a second end of the load resistor outputs a first voltage;
the protection control circuit includes: the device comprises a reference circuit, a discharge short-circuit judging circuit, a discharge overcurrent judging circuit, a short-circuit recovery detecting circuit, a time delay circuit, a first signal output circuit and a driving circuit;
a first input end of the discharge short circuit judging circuit is electrically connected with a first output end of the reference circuit, a second input end of the discharge short circuit judging circuit is connected with the first voltage, and an output end of the discharge short circuit judging circuit is electrically connected with a first input end of the delay circuit;
a first input end of the discharge overcurrent judging circuit is electrically connected with a second output end of the reference circuit, a second input end of the discharge overcurrent judging circuit is connected with the first voltage, and an output end of the discharge overcurrent judging circuit is electrically connected with a second input end of the delay circuit;
a first input end of the short circuit recovery detection circuit is electrically connected with an output end of the discharge short circuit judgment circuit through a first NOT gate, a second input end of the short circuit recovery detection circuit is connected with the first voltage, and an output end of the short circuit recovery detection circuit is electrically connected with a third input end of the delay circuit; a first input end of the short circuit recovery detection circuit is electrically connected with a control end of the second switch; the short circuit recovery detection circuit is used for controlling the drive circuit to conduct the first transistor according to a recovery condition after the protection control circuit enters a discharge overcurrent or discharge short circuit protection state;
the first input end of the first signal output circuit is electrically connected with the third output end of the delay circuit, the second input end of the first signal output circuit is electrically connected with the first output end of the delay circuit, the third input end of the first signal output circuit is electrically connected with the second output end of the delay circuit, the output end of the first signal output circuit is electrically connected with the first input end of the driving circuit, the output end of the driving circuit is electrically connected with the grid electrode of the first transistor, and the first signal output circuit is used for driving the driving circuit to control the first transistor to be switched on or switched off.
Optionally, the recovery condition is: the first voltage is less than a preset voltage of the short circuit recovery detection circuit.
Optionally, when the first voltage is greater than the short-circuit detection voltage output by the first output terminal of the reference circuit and the duration time is greater than a first delay time, the protection control circuit operates in a discharge short-circuit protection state;
and when the first voltage is greater than the discharge overcurrent detection voltage of the second output end of the reference circuit, is less than the short-circuit detection voltage and has the duration time greater than the second delay time, the protection control circuit works in a discharge overcurrent protection state.
Optionally, the short recovery detection circuit includes a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, a second not gate, and a third not gate;
a gate of the second transistor is connected to the first voltage, a first pole of the second transistor, a first pole of the fourth transistor, a first pole of the sixth transistor, a first pole of the ninth transistor, and a first pole of the tenth transistor are connected to a second voltage, a second pole of the second transistor is electrically connected to a first pole of the third transistor, a second pole of the third transistor is grounded, and a gate of the third transistor is connected to a first driving signal;
a gate of the fourth transistor is connected to the first voltage, a second pole of the fourth transistor is electrically connected to a first pole of the fifth transistor, a second pole of the fifth transistor is grounded, and a gate of the fifth transistor is electrically connected to an output terminal of the second not gate; a gate of the sixth transistor and a gate of the seventh transistor are both electrically connected to a second pole of the second transistor, the second pole of the sixth transistor is electrically connected to the first pole of the seventh transistor, the second pole of the seventh transistor is electrically connected to the first pole of the eighth transistor, the second pole of the eighth transistor is grounded, and the gate of the eighth transistor is connected to the first driving signal;
a gate of the ninth transistor is electrically connected to an output terminal of the first not gate, and a second pole of the ninth transistor is electrically connected to a second pole of the sixth transistor; a second pole of the tenth transistor is electrically connected to the first pole of the eleventh transistor, a second pole of the eleventh transistor is electrically connected to the first pole of the twelfth transistor, a second pole of the twelfth transistor is grounded, a gate of the tenth transistor and a gate of the eleventh transistor are both electrically connected to the second pole of the ninth transistor, and a gate of the twelfth transistor is connected to the first driving signal;
an input end of the second not gate is electrically connected to a second pole of the tenth transistor and a first pole of the thirteenth transistor, a second pole of the thirteenth transistor is grounded, a gate of the thirteenth transistor is electrically connected to an output end of the third not gate, an input end of the third not gate is electrically connected to an output end of the first not gate, and an output end of the second not gate is electrically connected to a third input end of the delay circuit.
Optionally, the short recovery detection circuit includes a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a seventeenth transistor, an eighteenth transistor, a nineteenth transistor, a twentieth transistor, a twenty-first transistor, a twentieth transistor, a twenty-third transistor, a twenty-fourth transistor, a twenty-fifth transistor, a twenty-sixth transistor, a twenty-seventh transistor, a twenty-eighth transistor, and a fourth not gate;
a gate of the fourteenth transistor is connected to the first voltage, a first pole of the fourteenth transistor, a first pole of the sixteenth transistor, a first pole of the eighteenth transistor, a first pole of the twenty-first transistor, a first pole of the twenty-fourth transistor, and a first pole of the twenty-seventh transistor are connected to a second voltage, a second pole of the fourteenth transistor is connected to the first pole of the fifteenth transistor, a second pole of the fifteenth transistor is connected to the first pole of the twenty-eighth transistor, and a gate of the fifteenth transistor is connected to the first driving signal;
a second pole of the sixteenth transistor is electrically connected to the first pole of the seventeenth transistor, a second pole of the seventeenth transistor is electrically connected to the second pole of the fourteenth transistor, a gate of the seventeenth transistor is connected to the first voltage, and a gate of the sixteenth transistor is electrically connected to the third input terminal of the delay circuit;
a gate of the eighteenth transistor is connected to the second driving signal, a second pole of the eighteenth transistor is electrically connected to the first pole of the nineteenth transistor, a second pole of the nineteenth transistor is electrically connected to the first pole of the twentieth transistor, a second pole of the twentieth transistor is electrically connected to the second pole of the fifteenth transistor, and a gate of the nineteenth transistor and a gate of the twentieth transistor are both electrically connected to the second pole of the seventeenth transistor;
a gate of the twenty-first transistor is connected to the second driving signal, a second pole of the twenty-first transistor is electrically connected to a first pole of the twenty-second transistor, a second pole of the twenty-second transistor is electrically connected to a first pole of the twenty-third transistor, a second pole of the twenty-third transistor is electrically connected to a second pole of the fifteenth transistor, and a gate of the twenty-second transistor and a gate of the twenty-third transistor are both electrically connected to a second pole of the nineteenth transistor;
a gate of the twenty-fourth transistor is connected to the second driving signal, a second pole of the twenty-fourth transistor is electrically connected to a first pole of the twenty-fifth transistor, a second pole of the twenty-fifth transistor is electrically connected to a first pole of the twenty-sixth transistor, a second pole of the twenty-sixth transistor is electrically connected to a second pole of the fifteenth transistor, and a gate of the twenty-fifth transistor and a gate of the twenty-sixth transistor are both electrically connected to a second pole of the twenty-second transistor;
a second pole of the twenty-seventh transistor is electrically connected to the third input terminal of the delay circuit, a gate of the twenty-seventh transistor is electrically connected to the output terminal of the first not gate, an input terminal of the fourth not gate is electrically connected to the output terminal of the first not gate, an output terminal of the fourth not gate is electrically connected to the gate of the twenty-eighth transistor, and a second pole of the twenty-eighth transistor is grounded.
Optionally, the first signal output circuit comprises a fifth not gate, a first and gate, or gate;
the input end of the fifth not gate is electrically connected with the third output end of the delay circuit, the output end of the fifth not gate is electrically connected with the first input end of the or gate, the first input end of the first and gate is electrically connected with the first output end of the delay circuit, the second input end of the first and gate is electrically connected with the second output end of the delay circuit, the output end of the first and gate is electrically connected with the second input end of the or gate, and the output end of the or gate is electrically connected with the first input end of the driving circuit.
Optionally, the protection control circuit further includes an over-discharge voltage determination circuit;
the first input end of the over-discharge voltage judging circuit is electrically connected with the third output end of the reference circuit, the second input end of the over-discharge voltage judging circuit is connected with a third voltage, the output end of the over-discharge voltage judging circuit is electrically connected with the fourth input end of the delay circuit, and the fourth output end of the delay circuit is electrically connected with the third input end of the first AND gate.
Optionally, the protection control circuit further includes a charging overcurrent judging circuit;
the first input end of the charging overcurrent judging circuit is electrically connected with the fourth output end of the reference circuit, the second input end of the charging overcurrent judging circuit is connected with the first voltage, and the output end of the charging overcurrent judging circuit is electrically connected with the second input end of the driving circuit.
Optionally, the protection control circuit further includes an overcharge voltage determination circuit and a second signal output circuit, where the second signal output circuit includes a second and gate;
the first input end of the overcharge voltage judging circuit is electrically connected with the fifth output end of the reference circuit, the second input end of the overcharge voltage judging circuit is connected with a fourth voltage, the output end of the overcharge voltage judging circuit is electrically connected with the sixth input end of the delay circuit, the output end of the charge overcurrent judging circuit is electrically connected with the fifth input end of the delay circuit, the fifth output end of the delay circuit is electrically connected with the first input end of the second AND gate, the sixth output end of the delay circuit is electrically connected with the second input end of the second AND gate, and the output end of the second AND gate is electrically connected with the third input end of the driving circuit.
In a second aspect, an embodiment of the present invention further provides a self-recovery lithium battery protection device, where the self-recovery lithium battery protection device includes the self-recovery lithium battery protection circuit described in the first aspect.
According to the self-recovery lithium battery protection circuit provided by the embodiment of the invention, the short circuit recovery detection circuit is arranged, after the protection control circuit enters a discharge overcurrent protection state or a discharge short circuit protection state, when the load voltage meets the recovery condition, the short circuit recovery detection circuit outputs a short circuit recovery voltage signal first signal output circuit, and the first signal output circuit sends a high-level voltage control signal to the drive circuit according to the short circuit recovery voltage signal so as to control the conduction of the first transistor; meanwhile, the short-circuit voltage judgment signal output by the discharge short-circuit judgment circuit outputs a low-level short-circuit voltage inversion signal to the second switch after the first NOT gate logic operation, so that the second switch is switched off. When the second switch is switched off and the first transistor is switched on, the protection control circuit is restored to a normal protection state, so that the lithium battery works in a normal discharge state. Compared with the prior art, the self-recovery lithium battery protection circuit provided by the embodiment of the invention can recover to the normal discharge state according to the discharge voltage after the protection control circuit enters the discharge short-circuit protection state or the discharge overcurrent protection state, the lithium battery does not need to be charged and activated, and the use effect of a user is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a self-recovery lithium battery protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a short-circuit recovery detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another short-circuit recovery detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another self-recovery lithium battery protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another self-recovery lithium battery protection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a self-recovery lithium battery protection circuit according to an embodiment of the present invention, and referring to fig. 1, the self-recovery lithium battery protection circuit according to the embodiment of the present invention includes a protection control circuit 10, a load resistor RL, a pull-down resistor RD, a first transistor Q1, a first switch K1, a second switch K2, a third switch K3, and a charger CD; a first end of the first switch K1 is electrically connected with the positive electrode of the lithium battery, a second end of the first switch K1 is connected with a first end of a load resistor RL, a second end of the load resistor RL is electrically connected with a first pole of a first transistor Q1, and a second pole of the first transistor Q1 is electrically connected with the negative electrode of the lithium battery; a first end of the pull-down resistor RD is connected with a first pole of a first transistor Q1, a gate of the first transistor Q1 is electrically connected with a driving signal output end X1 of the protection control circuit 10, and a second end of the pull-down resistor RD is connected with a negative pole of the lithium battery through a second switch K2; the second end of the load resistor RL outputs a first voltage V1;
the protection control circuit 10 includes: a reference circuit 101, a discharge short circuit judgment circuit 102, a discharge overcurrent judgment circuit 103, a short circuit recovery detection circuit 104, a delay circuit 105, a first signal output circuit 106 and a drive circuit 107; the first input terminal a1 of the discharge short-circuit determination circuit 102 is electrically connected to the first output terminal a1 of the reference circuit 101, the second input terminal a2 of the discharge short-circuit determination circuit 102 is connected to the first voltage V1, and the output terminal A3 of the discharge short-circuit determination circuit 102 is electrically connected to the first input terminal B11 of the delay circuit 105; the first input end B1 of the discharge overcurrent judging circuit 103 is electrically connected with the second output end a2 of the reference circuit 101, the second input end B2 of the discharge overcurrent judging circuit 103 is connected with the first voltage V1, and the output end B3 of the discharge overcurrent judging circuit 103 is electrically connected with the second input end B21 of the delay circuit 105; a first input terminal F1 of the short-circuit recovery detection circuit 104 is electrically connected to the output terminal a3 of the discharge short-circuit determination circuit 102 through a first not gate I1, a second input terminal F2 of the short-circuit recovery detection circuit 104 is connected to a first voltage V1, and an output terminal F3 of the short-circuit recovery detection circuit 104 is electrically connected to a third input terminal B31 of the delay circuit 105; the first input terminal F1 of the short-circuit recovery detection circuit 104 is electrically connected to the control terminal of the second switch K2; the short-circuit recovery detection circuit 104 is configured to control the driving circuit 107 to turn on the first transistor Q1 according to a recovery condition after the protection control circuit 10 enters a discharge overcurrent or discharge short-circuit protection state; the first input end D1 of the first signal output circuit 106 is electrically connected to the third output end B32 of the delay circuit 105, the second input end D2 of the first signal output circuit 106 is electrically connected to the first output end B12 of the delay circuit 105, the third input end D3 of the first signal output circuit 106 is electrically connected to the second output end B22 of the delay circuit 105, the output end D4 of the first signal output circuit 106 is electrically connected to the first input end E1 of the driving circuit 107, the output end E2 of the driving circuit 107 is electrically connected to the gate of the first transistor Q1, and the first signal output circuit 106 is configured to control the driving circuit 107 to turn on or off the first transistor.
Specifically, the normal operation state of the lithium battery may include a charging state, when the lithium battery is in the charging state, the first transistor Q1 is turned on, the third switch K3 is closed, and the charger CD charges the lithium battery through the first transistor Q1. The normal operation of the lithium battery also includes a discharge state, when the lithium battery is in the discharge state, the first transistor Q1 is turned on, the first switch K1 is closed, and the second switch K2 is opened, and the lithium battery is discharged through the load resistor RL and the first transistor Q1. The reference circuit 101 is used for providing a reference voltage for the protection control circuit 10, the first output terminal a1 of the reference circuit 101 outputs the short-circuit detection voltage VSHORT to the first input terminal a1 of the discharge short-circuit determination circuit 102, and the second input terminal a2 of the discharge short-circuit determination circuit 102 inputs a first voltage V1, where the first voltage V1 is a discharge voltage. The discharging short-circuit judging circuit 102 determines whether a short circuit occurs in a discharging loop of the lithium battery according to the first voltage V1 and the short-circuit detection voltage VSHORT. The second output end a2 of the reference circuit 101 outputs the discharge overcurrent detection voltage VOC1 to the first input end b1 of the discharge overcurrent judgment circuit 103, the second input end b2 of the discharge overcurrent judgment circuit 103 inputs the first voltage V1, and the discharge overcurrent judgment circuit 103 determines whether the discharge loop of the lithium battery is overcurrent according to the first voltage V1 and the discharge overcurrent detection voltage VOC 1. The discharge overcurrent detection voltage VOC1 is less than the short circuit detection voltage VSHORT. When a large current flows through the load resistor RL (i.e., the first voltage V1 increases), the first voltage V1 increases to be greater than the discharge overcurrent detection voltage VOC1 and less than the short-circuit detection voltage VSHORT, and the overcurrent voltage determination signal VOC1P output by the discharge overcurrent determination circuit 103 is low; if the first voltage V1 is pulled higher than the short-circuit detection voltage VSHORT, the over-current voltage determination signal VOC1P output by the discharging over-current determination circuit 103 is low, and the short-circuit voltage determination signal vshorp output by the discharging short-circuit determination circuit 102 is also low. The first signal output circuit 106 outputs a low-level voltage control signal VOD1 according to the short-circuit voltage judgment signal vshop output by the discharge short-circuit judgment circuit 102 and the overcurrent voltage judgment signal VOC1P output by the discharge overcurrent judgment circuit 103, the driving circuit 107 controls the first transistor Q1 to be turned off according to the received low-level voltage control signal VOD1, and the second switch K2 is closed, so that the protection control circuit 10 enters a discharge overcurrent or discharge short-circuit protection state, thereby preventing the large current discharge of the lithium battery.
The short-circuit voltage judgment signal vshorpt output by the discharge short-circuit judgment circuit 102 is at a low level, and outputs a short-circuit voltage inversion signal VSHORTN at a high level to the short-circuit recovery detection circuit 104 after logical operation of the first not gate I1, and when the first voltage V1 is greater than a recovery voltage, the short-circuit recovery voltage signal vshorre output by the short-circuit recovery detection circuit 104 is at a high level, and the protection control circuit 10 continues to maintain a discharge overcurrent or discharge short-circuit state, where the recovery voltage is a voltage set inside the short-circuit recovery detection circuit 104. When the first voltage V1 is reduced to be lower than the recovery voltage, the short-circuit recovery detection circuit 104 generates a short-circuit recovery voltage signal vshorre at a low level according to the first voltage V1, after a delay, the third output terminal B32 of the delay circuit 105 outputs the short-circuit recovery voltage signal vshorre at a low level subjected to the delay processing to the first signal output circuit 106, the first signal output circuit 106 outputs a voltage control signal VOD1 at a high level according to the received short-circuit recovery voltage signal vshorre at a low level subjected to the delay processing, and the driving circuit 107 controls the first transistor Q1 to be turned on according to the received voltage control signal VOD1 at a high level; meanwhile, the low-level short-circuit voltage reversal signal VSHORTN output by the first NOT gate I1 controls the second switch K2 to be disconnected, a discharging loop of the lithium battery is formed by the positive pole of the lithium battery, the first switch K1, the load resistor RL, the first transistor Q1 and the negative pole of the lithium battery, and the lithium battery works in a normal discharging state.
For example, the recovery condition is that the first voltage V1 is less than a preset voltage (i.e., a recovery voltage) of the short-circuit recovery detection circuit 104, after the protection control circuit 10 enters the discharge short-circuit protection state or the discharge overcurrent protection state, the first transistor Q1 is turned off, the second switch K2 is turned on, and the discharge loop between the positive electrode and the negative electrode of the lithium battery is the positive electrode of the lithium battery-the first switch K1-the load resistance RL-the pull-down resistance RD-the second switch K2, then the first voltage V1 at the first electrode of the first transistor Q1 = VDD [ RD/(RD + RL) ] < VM, where VM is the preset voltage of the short-circuit recovery detection circuit 104, VDD is a second voltage (a voltage output by the positive electrode of the lithium battery), and the above formula may be equivalent to RL > [ (VDD/VM) -1] < RD. RL >25k Ω when VDD =4V, VM =3.2V, RD =100k Ω, as derived from the above equation. However, in the prior art, the short-circuit recovery detection circuit 104 is not provided, and the recovery condition for the protection control circuit 10 to recover from the discharge short-circuit protection state to the normal operation state is V1= VDD × [ RD/(RD + RL) ] < VSHORT, and when VDD =4V, VSHORT =0.5V, and RD =100k Ω, RL >700k Ω is obtained according to the above expression. Since 25k Ω is much smaller than 700k Ω, the protection control circuit 10 with the short-circuit recovery detection circuit 104 is more easily recovered to the normal operation state, that is, when the load current decreases to a certain value, the first transistor Q1 is turned on, so that the lithium battery is recovered to the normal operation state.
According to the self-recovery lithium battery protection circuit provided by the embodiment of the invention, the short circuit recovery detection circuit is arranged, after the protection control circuit enters a discharge overcurrent protection state or a discharge short circuit protection state, when the load voltage meets the recovery condition, the short circuit recovery detection circuit outputs a short circuit recovery voltage signal first signal output circuit, and the first signal output circuit sends a high-level voltage control signal to the drive circuit according to the short circuit recovery voltage signal so as to control the conduction of the first transistor; meanwhile, the short-circuit voltage judgment signal output by the discharge short-circuit judgment circuit outputs a low-level short-circuit voltage inversion signal to the second switch after the first NOT gate logic operation, so that the second switch is switched off. When the second switch is switched off and the first transistor is switched on, the protection control circuit is restored to a normal protection state, so that the lithium battery works in a normal discharge state. Compared with the prior art, the self-recovery lithium battery protection circuit provided by the embodiment of the invention can recover to the normal discharge state according to the discharge voltage after the protection control circuit enters the discharge short-circuit protection state or the discharge overcurrent protection state, the lithium battery does not need to be charged and activated, and the use effect of a user is greatly improved.
It should be noted that, in the embodiment of the present invention, the input terminals and the output terminals of the delay circuit 105 are in a one-to-one correspondence relationship.
Alternatively, the discharge short-circuit protection state refers to that when the discharge circuit is short-circuited, the protection control circuit 10 controls the first transistor Q1 to be turned off, the second switch K2 to be turned on, and the lithium battery is discharged through the pull-down resistor RD and the second switch K2. When the first voltage V1 is greater than the short-circuit detection voltage VSHORT output from the first output terminal a1 of the reference circuit 101 and the duration time is greater than the first delay time, the protection control circuit 10 operates in the discharge short-circuit protection state. The first delay time is a time for the discharging short circuit determining circuit 102 to detect a short circuit. When the first voltage V1 is greater than the discharge overcurrent detection voltage VOC1 at the second output terminal a2 of the reference circuit 101, is less than the short-circuit detection voltage vshirt, and has a duration greater than the second delay time, the protection control circuit 10 operates in a discharge overcurrent protection state. The second delay time is the time for detecting the overcurrent by the discharge overcurrent judging circuit 103.
Fig. 2 is a schematic structural diagram of a short circuit recovery detection circuit according to an embodiment of the present invention. Referring to fig. 2, on the basis of the above technical solution, the short recovery detection circuit 104 includes a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8, a ninth transistor Q9, a tenth transistor Q10, an eleventh transistor Q11, a twelfth transistor Q12, a thirteenth transistor Q13, a second not gate I2, and a third not gate I3; a gate of the second transistor Q2 is connected to a first voltage V1, a first pole of the second transistor Q2, a first pole of the fourth transistor Q4, a first pole of the sixth transistor Q6, a first pole of the ninth transistor Q9, and a first pole of the tenth transistor Q10 are connected to a second voltage VDD, a second pole of the second transistor Q2 is electrically connected to a first pole of the third transistor Q3, a second pole of the third transistor Q3 is grounded, and a gate of the third transistor Q3 is connected to the first driving signal NBIAS; the gate of the fourth transistor Q4 is connected to the first voltage V1, the second pole of the fourth transistor Q4 is electrically connected to the first pole of the fifth transistor Q5, the second pole of the fifth transistor Q5 is grounded, and the gate of the fifth transistor Q5 is electrically connected to the output end of the second not gate I2; the gate of the sixth transistor Q6 and the gate of the seventh transistor Q7 are both electrically connected to the second pole of the second transistor Q2, the second pole of the sixth transistor Q6 is electrically connected to the first pole of the seventh transistor Q7, the second pole of the seventh transistor Q7 is electrically connected to the first pole of the eighth transistor Q8, the second pole of the eighth transistor Q8 is grounded, and the gate of the eighth transistor Q8 is connected to the first drive signal NBIAS; a gate of the ninth transistor Q9 is electrically connected to the output terminal of the first not gate I1, and a second pole of the ninth transistor Q9 is electrically connected to the second pole of the sixth transistor Q6; a second pole of the tenth transistor Q10 is electrically connected to the first pole of the eleventh transistor Q11, a second pole of the eleventh transistor Q11 is electrically connected to the first pole of the twelfth transistor Q12, the second pole of the twelfth transistor Q12 is grounded, a gate of the tenth transistor Q10 and a gate of the eleventh transistor Q11 are both electrically connected to the second pole of the ninth transistor Q9, and a gate of the twelfth transistor Q12 is connected to the first driving signal NBIAS; the input terminal of the second not gate I2 is electrically connected to the second pole of the tenth transistor Q10 and the first pole of the thirteenth transistor Q13, respectively, the second pole of the thirteenth transistor Q13 is grounded, the gate of the thirteenth transistor Q13 is electrically connected to the output terminal of the third not gate I3, the input terminal of the third not gate I3 is electrically connected to the output terminal of the first not gate I1, and the output terminal of the second not gate I2 is electrically connected to the third input terminal B31 of the delay circuit 105.
The second transistor Q2, the fourth transistor Q4, the fifth transistor Q5, the sixth transistor Q6, the ninth transistor Q9 and the tenth transistor Q10 are P-type transistors, and the other transistors are N-type transistors. When the protection control circuit 10 enters the discharging short-circuit protection state or the discharging overcurrent protection state, the recovery condition is V1< VDD-Vth, where Vth is the threshold voltage of the second transistor Q2. The protection control circuit 10 is described as an example of a discharge overcurrent protection state. When the first voltage V1 is greater than the discharging overcurrent detection voltage VOC1 and less than the short-circuit detection voltage VSHORT and the duration is greater than the second delay time, the protection control circuit 10 enters a discharging overcurrent protection state, the first signal output circuit 106 outputs a low-level voltage control signal VOD1, the driving circuit 107 controls the first transistor Q1 to be turned off according to the received low-level voltage control signal VOD1, the second switch K2 is closed, and the first voltage V1 is discharged through the pull-down resistor RD, so that the first voltage V1 rises. At this time, the first voltage V1 rises to be greater than the short-circuit detection voltage VSHORT, and the short-circuit voltage determination signal vshorp output by the discharge short-circuit determination circuit 102 is at a low level.
Or when the first voltage V1 is greater than the short-circuit detection voltage VSHORT and the duration is greater than the first delay time, the protection control circuit 10 enters a discharge short-circuit protection state, the first signal output circuit 106 outputs the low-level voltage control signal VOD1, the driving circuit 107 controls the first transistor Q1 to be turned off according to the received low-level voltage control signal VOD1, the second switch K2 is closed, and the discharge is performed through the pull-down resistor RD, so that the first voltage V1 rises. At this time, the short-circuit voltage determination signal vshoptp output by the discharge short-circuit determination circuit 102 is at a low level.
When the boosted first voltage V1 satisfies V1> VDD-Vth, the second transistor Q2 is turned off, the third transistor Q3 is turned on under the action of the first driving signal NBIAS, the sixth transistor Q6, the seventh transistor Q7 and the eighth transistor Q8 are equivalent to an inverter, the tenth transistor Q10, the eleventh transistor Q11 and the twelfth transistor Q12 are equivalent to an inverter, the ninth transistor Q9 and the thirteenth transistor Q13 are enabling control transistors which are not turned on, the short recovery voltage signal VSHORTRE output by the short recovery detection circuit 104 is at a high level, and the protection control circuit 10 continues to maintain the discharge overcurrent protection state.
When the first voltage V1 satisfies the recovery condition V1< VDD-Vth, the second transistor Q2 is turned on, under the action of the first driving signal NBIAS, the third transistor Q3 is turned on, the sixth transistor Q6, the seventh transistor Q7 and the eighth transistor Q8 are equivalent to an inverter, the tenth transistor Q10, the eleventh transistor Q11 and the twelfth transistor Q12 are equivalent to an inverter, the ninth transistor Q9 and the thirteenth transistor Q13 are enable control transistors which are not turned on, the short circuit recovery voltage signal VSHORTRE output by the short circuit recovery detection circuit 104 is at a low level, after being delayed by the delay circuit 105, the first signal output circuit 106 outputs a high-level voltage control signal VOD1, and the driving circuit 107 controls the first transistor Q1 to be turned on according to the received high-level voltage control signal VOD 1; meanwhile, the low-level short-circuit voltage reversal signal VSHORTN output by the first NOT gate I1 controls the second switch K2 to be disconnected, a discharging loop of the lithium battery is formed by the positive pole of the lithium battery, the first switch K1, the load resistor RL, the first transistor Q1 and the negative pole of the lithium battery, and the lithium battery works in a normal discharging state. Compared with the prior art, the short-circuit recovery detection circuit 104 provided by the embodiment of the invention does not need to compare the first voltage V1 with the reference voltage, and can enable the protection control circuit to recover to a normal working state only when the first voltage V1 meets the recovery condition, and meanwhile, the anti-interference capability of the short-circuit recovery detection circuit 104 can be improved through the multi-stage transistor structure.
As another optional implementation manner of the embodiment of the present invention, fig. 3 is a schematic structural diagram of another short circuit recovery detection circuit provided in the embodiment of the present invention, and with reference to fig. 3, the short circuit recovery detection circuit 104 includes a fourteenth transistor Q14, a fifteenth transistor Q15, a sixteenth transistor Q16, a seventeenth transistor Q17, an eighteenth transistor Q18, a nineteenth transistor Q19, a twentieth transistor Q20, a twenty-first transistor Q21, a twentieth transistor Q22, a twenty-third transistor Q23, a twenty-fourth transistor Q24, a twenty-fifth transistor Q25, a twenty-sixth transistor Q26, a twenty-seventh transistor Q27, a twenty-eighth transistor Q28, and a fourth not gate I4; a gate of the fourteenth transistor Q14 is connected to the first voltage V1, a first pole of the fourteenth transistor Q14, a first pole of the sixteenth transistor Q16, a first pole of the eighteenth transistor Q18, a first pole of the twenty-first transistor Q21, a first pole of the twenty-fourth transistor Q24, and a first pole of the twenty-seventh transistor Q27 are all connected to the second voltage VDD, a second pole of the fourteenth transistor Q14 is connected to a first pole of the fifteenth transistor Q15, a second pole of the fifteenth transistor Q15 is connected to a first pole of the twenty-eighth transistor Q28, and a gate of the fifteenth transistor Q15 is connected to the first driving signal ianbs; a second pole of the sixteenth transistor Q16 is electrically connected to the first pole of the seventeenth transistor Q17, a second pole of the seventeenth transistor Q17 is electrically connected to the second pole of the fourteenth transistor Q14, a gate of the seventeenth transistor Q17 is connected to the first voltage V1, and a gate of the sixteenth transistor Q16 is electrically connected to the third input terminal B31 of the delay circuit 105; a gate of the eighteenth transistor Q18 is connected to the second driving signal PBIAS, a second pole of the eighteenth transistor Q18 is electrically connected to the first pole of the nineteenth transistor Q19, a second pole of the nineteenth transistor Q19 is electrically connected to the first pole of the twentieth transistor Q20, a second pole of the twentieth transistor Q20 is electrically connected to the second pole of the fifteenth transistor Q15, and a gate of the nineteenth transistor Q19 and a gate of the twentieth transistor Q20 are both electrically connected to the second pole of the seventeenth transistor Q17; the gate of the twenty-first transistor Q21 is connected to the second driving signal PBIAS, the second pole of the twenty-first transistor Q21 is electrically connected to the first pole of the twenty-second transistor Q22, the second pole of the twenty-second transistor Q22 is electrically connected to the first pole of the twenty-third transistor Q23, the second pole of the twenty-third transistor Q23 is electrically connected to the second pole of the fifteenth transistor Q15, and the gates of the twenty-second transistor Q22 and the twenty-third transistor Q23 are both electrically connected to the second pole of the nineteenth transistor Q19; a gate of the twenty-fourth transistor Q24 is connected to the second driving signal PBIAS, a second pole of the twenty-fourth transistor Q24 is electrically connected to the first pole of the twenty-fifth transistor Q25, a second pole of the twenty-fifth transistor Q25 is electrically connected to the first pole of the twenty-sixth transistor Q26, a second pole of the twenty-sixth transistor Q26 is electrically connected to the second pole of the fifteenth transistor Q15, and a gate of the twenty-fifth transistor Q25 and a gate of the twenty-sixth transistor Q26 are both electrically connected to the second pole of the twenty-second transistor Q22; a second pole of the twenty-seventh transistor Q27 is electrically connected to the third input terminal B31 of the delay circuit 105, a gate of the twenty-seventh transistor Q27 is electrically connected to the output terminal of the first not gate I1, an input terminal of the fourth not gate I4 is electrically connected to the output terminal of the first not gate I1, an output terminal of the fourth not gate I4 is electrically connected to the gate of the twenty-eighth transistor Q28, and a second pole of the twenty-eighth transistor Q28 is grounded.
Specifically, the short-circuit recovery detection circuit 104 provided in the embodiment of the present invention is different from the short-circuit recovery detection circuit 104 shown in fig. 2 in that a set of inverters is added, and the first driving signal NBIAS and the second driving signal PBIAS respectively provide driving signals for different types of transistors, so that the anti-interference capability of the short-circuit recovery detection circuit 104 can be further enhanced, and a specific working principle of the short-circuit recovery detection circuit 104 is the same as that of the short-circuit recovery detection circuit 104 shown in fig. 2, and is not described herein again.
Fig. 4 is a schematic structural diagram of another self-recovery lithium battery protection circuit according to an embodiment of the present invention, and referring to fig. 4, on the basis of the foregoing technical solutions, the first signal output circuit 106 includes a fifth not gate I5, a first and gate I6, and an or gate I7; an input end of the fifth not gate I5 is electrically connected to the third output end B32 of the delay circuit 105, an output end of the fifth not gate I5 is electrically connected to the first input end of the or gate I7, a first input end of the first and gate I6 is electrically connected to the first output end B12 of the delay circuit 105, a second input end of the first and gate I6 is electrically connected to the second output end B22 of the delay circuit 105, an output end of the first and gate I6 is electrically connected to the second input end of the or gate I7, and an output end of the or gate I7 is electrically connected to the first input end E1 of the driving circuit 107.
Specifically, the discharge short-circuit determination circuit 102 includes a first comparator VC1, and the discharge overcurrent determination circuit 103 includes a second comparator VC 2.
When the first voltage V1 is greater than the discharge overcurrent detection voltage VOC1 output by the reference circuit 101 and less than the short-circuit detection voltage VSHORT output by the reference circuit 101, and the duration time is greater than the second delay time, the overcurrent voltage determination signal VOC1P output by the discharge overcurrent determination circuit 103 is at a low level, the protection control circuit 10 enters a discharge overcurrent protection state, the first transistor Q1 is turned off, and the second switch K2 is turned on.
When the first voltage V1 is greater than the short-circuit detection voltage VSHORT output by the reference circuit 101 and the duration time is greater than the first delay time, the short-circuit voltage determination signal vshorp output by the discharge short-circuit determination circuit 102 is at a low level, the protection control circuit 10 enters a discharge short-circuit protection state, the first transistor Q1 is turned off, and the second switch K2 is turned on. When the short-circuit voltage determination signal VSHORTP output from the discharge short-circuit determination circuit 102 is at a low level, the short-circuit voltage inversion signal VSHORTN output from the first not gate I1 is at a high level. When the first voltage V1 is greater than the recovery voltage, the short-circuit recovery voltage signal vshorre output after the logic operation in the short-circuit recovery detection circuit 104 is at a high level, and after the delay of the delay circuit 105, the short-circuit recovery voltage signal vshorre at the high level is still output to the input end of the fifth not gate I5, the fifth not gate I5 inverts the short-circuit recovery voltage signal vshorre at the high level to a low level for output, the output of the or gate I7 and the drive circuit 107 remains unchanged, the first transistor Q1 is kept off, and the system is in a discharge overcurrent or discharge short-circuit state. When the first voltage V1 is less than the short-circuit recovery detection voltage VSHORT, the short-circuit recovery detection circuit 104 generates a short-circuit recovery voltage signal VSHORTRE at a low level according to the first voltage V1, after a delay, the third output terminal B32 of the delay circuit 105 outputs the short-circuit recovery voltage signal VSHORTRE at a low level subjected to the delay processing to the fifth not gate I5, the fifth not gate I5 outputs a high level according to the received short-circuit recovery voltage signal VSHORTRE at a low level subjected to the delay processing, or the gate I7 outputs a voltage control signal VOD1 at a high level, and the driving circuit 107 controls the first transistor Q1 to be turned on according to the received voltage control signal VOD1 at a high level; meanwhile, the low-level short-circuit voltage reversal signal VSHORTN output by the first NOT gate I1 controls the second switch K2 to be disconnected, a discharging loop of the lithium battery is formed by the positive pole of the lithium battery, the first switch K1, the load resistor RL, the first transistor Q1 and the negative pole of the lithium battery, and the lithium battery works in a normal discharging state.
It should be noted that, since the first signal output circuit 106 includes the or gate I7, the first transistor Q1 can be controlled to be turned on only by ensuring that the short-circuit recovery voltage signal VSHORTRE output by the short-circuit recovery detection circuit 104 is at a low level and a certain time delay, so as to achieve the recovery of the protection control circuit 10 to the normal operating state.
Fig. 5 is a schematic structural diagram of another self-recovery lithium battery protection circuit according to an embodiment of the present invention, and referring to fig. 5, on the basis of the foregoing technical solutions, the protection control circuit 10 further includes an over-discharge voltage determination circuit 108; the first input terminal c1 of the overdischarge voltage determination circuit 108 is electrically connected to the third output terminal A3 of the reference circuit 101, the second input terminal c2 of the overdischarge voltage determination circuit 108 is connected to the third voltage V3, the output terminal c3 of the overdischarge voltage determination circuit 108 is electrically connected to the fourth input terminal B41 of the delay circuit 105, and the fourth output terminal B42 of the delay circuit 105 is electrically connected to the third input terminal of the first and gate I6.
Specifically, the over-discharge voltage judging circuit 108 is configured to judge whether the protection control circuit 10 is in an over-discharge state, the over-discharge voltage judging circuit 108 includes a third comparator VC3, a first input terminal c1 of the over-discharge voltage judging circuit 108 inputs the over-discharge voltage detection voltage VODV output by the reference circuit 101, and a second input terminal c2 inputs a third voltage V3, where the third voltage V3 may be converted from the second voltage VDD. When the third voltage V3 is less than the overdischarge voltage detection voltage VODV, indicating that the lithium battery is in an overdischarge state, the overdischarge voltage determination circuit 108 outputs a low-level overdischarge voltage determination signal VODVP, and the first and gate I6 outputs a low-level control signal to the driving circuit 107 according to the low-level overdischarge voltage determination signal VODVP, so as to control the first transistor Q1 to turn off, thereby preventing the lithium battery from continuously discharging.
With continued reference to fig. 5, the protection control circuit 10 further includes a charging overcurrent determination circuit 109; the first input d1 of the charging overcurrent determination circuit 109 is electrically connected to the fourth output a4 of the reference circuit 101, the second input d2 of the charging overcurrent determination circuit 109 is connected to the first voltage V1, and the output d3 of the charging overcurrent determination circuit 109 is electrically connected to the second input E3 of the driving circuit 107. The protection control circuit 10 further includes an overcharge voltage determination circuit 110 and a second signal output circuit 111, where the second signal output circuit 111 includes a second and gate I8; the first input E1 of the overcharge voltage determination circuit 110 is electrically connected to the fifth output a5 of the reference circuit 101, the second input E2 of the overcharge voltage determination circuit 110 is connected to the fourth voltage V4, the output E3 of the overcharge voltage determination circuit 110 is electrically connected to the sixth input B61 of the delay circuit 105, the output d3 of the charge overcurrent determination circuit 109 is electrically connected to the fifth input B51 of the delay circuit 105, the fifth output B52 of the delay circuit 105 is electrically connected to the first input of the second and gate I8, the sixth output B62 of the delay circuit 105 is electrically connected to the second input of the second and gate I8, and the output of the second and gate I8 is electrically connected to the third input E4 of the driving circuit 107.
Specifically, the charging overcurrent determination circuit 109 and the overcharge voltage determination circuit 110 are used to determine whether an overcharge phenomenon occurs during the charging process of the lithium battery. The charging overcurrent determination circuit 10 includes a fourth comparator VC4, a first input end d1 of the charging overcurrent determination circuit 10 inputs the charging overcurrent detection voltage VCHOC output by the reference circuit 101, a second input end d2 thereof inputs the first voltage V1, when the first voltage V1 (at this time, the first voltage V1 is the real-time charging voltage of the lithium battery) is greater than the charging overcurrent detection voltage VCHOC, the charging overcurrent determination circuit 10 outputs a high-level charging overcurrent determination signal VCHOC1, and the charging overcurrent determination signal VCHOC1 is delayed by the delay circuit 105 and then input to the first input end of the second and gate I8. The overcharge voltage determination circuit 110 includes a fifth comparator VC5, the overcharge detection voltage VOCV output by the reference circuit 101 is input to a first input terminal e1 of the overcharge voltage determination circuit 110, and a fourth voltage V4 is input to a second input terminal e2 of the overcharge voltage determination circuit 110, wherein the fourth voltage V4 is converted from the second voltage VDD. When the fourth voltage is greater than the overcharge detection voltage VOCV, indicating that the lithium battery is in an overcharge state, the overcharge voltage determination circuit 110 outputs a low-level overcharge voltage determination signal VOCVP, and the overcharge voltage determination signal VOCVP is delayed by the delay circuit 105 and then is input to the second input terminal of the second and gate I8. And outputting a low-level control signal under the action of the low-level overcharge voltage judgment signal VOCVP and the high-level charge overcurrent judgment signal VCHOC1 to control the first transistor Q1 to be turned off and stop charging the lithium battery.
According to the self-recovery lithium battery protection circuit provided by the embodiment of the invention, the short circuit recovery detection circuit is arranged, after the protection control circuit enters a discharge overcurrent protection state or a discharge short circuit protection state, when load current or discharge voltage meets a recovery condition, the short circuit recovery detection circuit outputs a short circuit recovery voltage signal first signal output circuit, and the first signal output circuit sends a high-level voltage control signal to the drive circuit according to the short circuit recovery voltage signal so as to control the conduction of the first transistor; meanwhile, the short-circuit voltage judgment signal output by the discharge short-circuit judgment circuit outputs a low-level short-circuit voltage inversion signal to the second switch after the first NOT gate logic operation, so that the second switch is switched off. When the second switch is switched off and the first transistor is switched on, the protection control circuit is restored to a normal protection state, so that the lithium battery works in a normal discharge state. Compared with the prior art, the self-recovery lithium battery protection circuit provided by the embodiment of the invention can recover to the normal discharge state according to the discharge voltage after the protection control circuit enters the discharge short-circuit protection state or the discharge overcurrent protection state, the lithium battery does not need to be charged and activated, and the use effect of a user is greatly improved. And the overcharge and overdischarge protection of the lithium battery can be realized through the charging overcurrent judgment circuit, the overcharge voltage judgment circuit and the overdischarge voltage judgment circuit, so that the lithium battery is comprehensively protected, and the service life of the lithium battery is prolonged.
In addition, an embodiment of the present invention further provides a self-recovery lithium battery protection device, including the self-recovery lithium battery protection circuit provided in any embodiment of the present invention, so that the self-recovery lithium battery protection device provided in an embodiment of the present invention also has the beneficial effects described in any embodiment above.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A self-healing lithium battery protection circuit, comprising: the protection control circuit, the load resistor, the pull-down resistor, the first transistor, the first switch, the second switch, the third switch and the charger are connected; a first end of the first switch is electrically connected with a positive electrode of a lithium battery, a second end of the first switch is connected with a first end of the load resistor, a second end of the load resistor is electrically connected with a first electrode of the first transistor, and a second electrode of the first transistor is electrically connected with a negative electrode of the lithium battery; the first end of the pull-down resistor is connected with the first pole of the first transistor, the grid electrode of the first transistor is electrically connected with the driving signal output end of the protection control circuit, and the second end of the pull-down resistor is connected to the negative electrode of the lithium battery through the second switch; a second end of the load resistor outputs a first voltage;
the protection control circuit includes: the device comprises a reference circuit, a discharge short-circuit judging circuit, a discharge overcurrent judging circuit, a short-circuit recovery detecting circuit, a time delay circuit, a first signal output circuit and a driving circuit;
a first input end of the discharge short circuit judging circuit is electrically connected with a first output end of the reference circuit, a second input end of the discharge short circuit judging circuit is connected with the first voltage, and an output end of the discharge short circuit judging circuit is electrically connected with a first input end of the delay circuit;
a first input end of the discharge overcurrent judging circuit is electrically connected with a second output end of the reference circuit, a second input end of the discharge overcurrent judging circuit is connected with the first voltage, and an output end of the discharge overcurrent judging circuit is electrically connected with a second input end of the delay circuit;
a first input end of the short circuit recovery detection circuit is electrically connected with an output end of the discharge short circuit judgment circuit through a first NOT gate, a second input end of the short circuit recovery detection circuit is connected with the first voltage, and an output end of the short circuit recovery detection circuit is electrically connected with a third input end of the delay circuit; a first input end of the short circuit recovery detection circuit is electrically connected with a control end of the second switch; the short circuit recovery detection circuit is used for controlling the drive circuit to conduct the first transistor according to a recovery condition after the protection control circuit enters a discharge overcurrent or discharge short circuit protection state;
the first input end of the first signal output circuit is electrically connected with the third output end of the delay circuit, the second input end of the first signal output circuit is electrically connected with the first output end of the delay circuit, the third input end of the first signal output circuit is electrically connected with the second output end of the delay circuit, the output end of the first signal output circuit is electrically connected with the first input end of the driving circuit, the output end of the driving circuit is electrically connected with the grid electrode of the first transistor, and the first signal output circuit is used for driving the driving circuit to control the first transistor to be switched on or switched off.
2. The self-healing lithium battery protection circuit according to claim 1, wherein the healing condition is: the first voltage is less than a preset voltage of the short circuit recovery detection circuit.
3. The self-recovery lithium battery protection circuit as claimed in claim 1, wherein when the first voltage is greater than the short-circuit detection voltage outputted from the first output terminal of the reference circuit and the duration time is greater than the first delay time, the protection control circuit operates in a discharge short-circuit protection state;
and when the first voltage is greater than the discharge overcurrent detection voltage of the second output end of the reference circuit, is less than the short-circuit detection voltage and has the duration time greater than the second delay time, the protection control circuit works in a discharge overcurrent protection state.
4. The self-recovery lithium battery protection circuit of claim 1, wherein the short recovery detection circuit comprises a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, a twelfth transistor, a thirteenth transistor, a second not gate, and a third not gate;
a gate of the second transistor is connected to the first voltage, a first pole of the second transistor, a first pole of the fourth transistor, a first pole of the sixth transistor, a first pole of the ninth transistor, and a first pole of the tenth transistor are connected to a second voltage, a second pole of the second transistor is electrically connected to a first pole of the third transistor, a second pole of the third transistor is grounded, and a gate of the third transistor is connected to a first driving signal;
a gate of the fourth transistor is connected to the first voltage, a second pole of the fourth transistor is electrically connected to a first pole of the fifth transistor, a second pole of the fifth transistor is grounded, and a gate of the fifth transistor is electrically connected to an output terminal of the second not gate; a gate of the sixth transistor and a gate of the seventh transistor are both electrically connected to a second pole of the second transistor, the second pole of the sixth transistor is electrically connected to the first pole of the seventh transistor, the second pole of the seventh transistor is electrically connected to the first pole of the eighth transistor, the second pole of the eighth transistor is grounded, and the gate of the eighth transistor is connected to the first driving signal;
a gate of the ninth transistor is electrically connected to an output terminal of the first not gate, and a second pole of the ninth transistor is electrically connected to a second pole of the sixth transistor; a second pole of the tenth transistor is electrically connected to the first pole of the eleventh transistor, a second pole of the eleventh transistor is electrically connected to the first pole of the twelfth transistor, a second pole of the twelfth transistor is grounded, a gate of the tenth transistor and a gate of the eleventh transistor are both electrically connected to the second pole of the ninth transistor, and a gate of the twelfth transistor is connected to the first driving signal;
an input end of the second not gate is electrically connected to a second pole of the tenth transistor and a first pole of the thirteenth transistor, a second pole of the thirteenth transistor is grounded, a gate of the thirteenth transistor is electrically connected to an output end of the third not gate, an input end of the third not gate is electrically connected to an output end of the first not gate, and an output end of the second not gate is electrically connected to a third input end of the delay circuit.
5. The self-recovery lithium battery protection circuit of claim 1, wherein the short recovery detection circuit comprises a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a seventeenth transistor, an eighteenth transistor, a nineteenth transistor, a twentieth transistor, a twenty-first transistor, a twenty-second transistor, a twenty-third transistor, a twenty-fourth transistor, a twenty-fifth transistor, a twenty-sixth transistor, a twenty-seventh transistor, a twenty-eighth transistor, and a fourth not gate;
a gate of the fourteenth transistor is connected to the first voltage, a first pole of the fourteenth transistor, a first pole of the sixteenth transistor, a first pole of the eighteenth transistor, a first pole of the twenty-first transistor, a first pole of the twenty-fourth transistor, and a first pole of the twenty-seventh transistor are connected to a second voltage, a second pole of the fourteenth transistor is connected to the first pole of the fifteenth transistor, a second pole of the fifteenth transistor is connected to the first pole of the twenty-eighth transistor, and a gate of the fifteenth transistor is connected to the first driving signal;
a second pole of the sixteenth transistor is electrically connected to the first pole of the seventeenth transistor, a second pole of the seventeenth transistor is electrically connected to the second pole of the fourteenth transistor, a gate of the seventeenth transistor is connected to the first voltage, and a gate of the sixteenth transistor is electrically connected to the third input terminal of the delay circuit;
a gate of the eighteenth transistor is connected to the second driving signal, a second pole of the eighteenth transistor is electrically connected to the first pole of the nineteenth transistor, a second pole of the nineteenth transistor is electrically connected to the first pole of the twentieth transistor, a second pole of the twentieth transistor is electrically connected to the second pole of the fifteenth transistor, and a gate of the nineteenth transistor and a gate of the twentieth transistor are both electrically connected to the second pole of the seventeenth transistor;
a gate of the twenty-first transistor is connected to the second driving signal, a second pole of the twenty-first transistor is electrically connected to a first pole of the twenty-second transistor, a second pole of the twenty-second transistor is electrically connected to a first pole of the twenty-third transistor, a second pole of the twenty-third transistor is electrically connected to a second pole of the fifteenth transistor, and a gate of the twenty-second transistor and a gate of the twenty-third transistor are both electrically connected to a second pole of the nineteenth transistor;
a gate of the twenty-fourth transistor is connected to the second driving signal, a second pole of the twenty-fourth transistor is electrically connected to a first pole of the twenty-fifth transistor, a second pole of the twenty-fifth transistor is electrically connected to a first pole of the twenty-sixth transistor, a second pole of the twenty-sixth transistor is electrically connected to a second pole of the fifteenth transistor, and a gate of the twenty-fifth transistor and a gate of the twenty-sixth transistor are both electrically connected to a second pole of the twenty-second transistor;
a second pole of the twenty-seventh transistor is electrically connected to the third input terminal of the delay circuit, a gate of the twenty-seventh transistor is electrically connected to the output terminal of the first not gate, an input terminal of the fourth not gate is electrically connected to the output terminal of the first not gate, an output terminal of the fourth not gate is electrically connected to the gate of the twenty-eighth transistor, and a second pole of the twenty-eighth transistor is grounded.
6. The self-recovery lithium battery protection circuit of claim 1, wherein the first signal output circuit comprises a fifth not gate, a first and gate, and a gate;
the input end of the fifth not gate is electrically connected with the third output end of the delay circuit, the output end of the fifth not gate is electrically connected with the first input end of the or gate, the first input end of the first and gate is electrically connected with the first output end of the delay circuit, the second input end of the first and gate is electrically connected with the second output end of the delay circuit, the output end of the first and gate is electrically connected with the second input end of the or gate, and the output end of the or gate is electrically connected with the first input end of the driving circuit.
7. The self-recovery lithium battery protection circuit of claim 6, wherein the protection control circuit further comprises an over-discharge voltage determination circuit;
the first input end of the over-discharge voltage judging circuit is electrically connected with the third output end of the reference circuit, the second input end of the over-discharge voltage judging circuit is connected with a third voltage, the output end of the over-discharge voltage judging circuit is electrically connected with the fourth input end of the delay circuit, and the fourth output end of the delay circuit is electrically connected with the third input end of the first AND gate.
8. The self-recovery lithium battery protection circuit of claim 1, wherein the protection control circuit further comprises a charging overcurrent judgment circuit;
the first input end of the charging overcurrent judging circuit is electrically connected with the fourth output end of the reference circuit, the second input end of the charging overcurrent judging circuit is connected with the first voltage, and the output end of the charging overcurrent judging circuit is electrically connected with the second input end of the driving circuit.
9. The self-recovery lithium battery protection circuit of claim 8, wherein the protection control circuit further comprises an overcharge voltage determination circuit and a second signal output circuit, the second signal output circuit comprising a second and gate;
the first input end of the overcharge voltage judging circuit is electrically connected with the fifth output end of the reference circuit, the second input end of the overcharge voltage judging circuit is connected with a fourth voltage, the output end of the overcharge voltage judging circuit is electrically connected with the sixth input end of the delay circuit, the output end of the charge overcurrent judging circuit is electrically connected with the fifth input end of the delay circuit, the fifth output end of the delay circuit is electrically connected with the first input end of the second AND gate, the sixth output end of the delay circuit is electrically connected with the second input end of the second AND gate, and the output end of the second AND gate is electrically connected with the third input end of the driving circuit.
10. A self-healing lithium battery protection device, characterized in that it comprises a self-healing lithium battery protection circuit according to any one of claims 1 to 9.
CN202010939938.5A 2020-09-09 2020-09-09 Self-recovery lithium battery protection circuit and device Active CN111817261B (en)

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CN114498567A (en) * 2020-10-27 2022-05-13 圣邦微电子（北京）股份有限公司 Battery protection chip, short circuit retry protection control circuit and method thereof
CN112688394A (en) * 2020-12-28 2021-04-20 苏州赛芯电子科技股份有限公司 Lithium battery charging protection circuit and lithium battery
CN114530914B (en) * 2022-03-15 2023-03-14 苏州赛芯电子科技股份有限公司 Battery protection system and lithium battery
CN114552538B (en) * 2022-03-15 2023-03-14 苏州赛芯电子科技股份有限公司 Battery protection system with load turn-off function and lithium battery
CN115102532B (en) * 2022-08-23 2022-11-15 宁波兴为汽车电子有限公司 Short-circuit overcurrent protection circuit and method for high-side output of MOS (Metal oxide semiconductor) tube and vehicle

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