CN112003355B - Lithium battery protection device and system with power-on self-locking function - Google Patents
Lithium battery protection device and system with power-on self-locking function Download PDFInfo
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- CN112003355B CN112003355B CN202011184302.0A CN202011184302A CN112003355B CN 112003355 B CN112003355 B CN 112003355B CN 202011184302 A CN202011184302 A CN 202011184302A CN 112003355 B CN112003355 B CN 112003355B
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Abstract
The invention provides a lithium battery protection device and a lithium battery protection system with power-on self-locking function, which comprise a lithium battery protection chip, a lithium battery, a charger, a load, a switch K1 and a switch K2, wherein the lithium battery protection chip comprises a basic protection circuit, a grid substrate control circuit and a charge-discharge control MOS (metal oxide semiconductor) transistor M1; the positive electrode of the lithium battery is connected to one end of a charger or a load through a switch K1 or a switch K2; the other end VM of the charger or the load is connected to one end of a source electrode and a drain electrode of the charging and discharging control MOS tube M1, and the other end of the source electrode and the drain electrode of the charging and discharging control MOS tube M1 is connected to the negative electrode of the lithium battery; the grid and the substrate of the charging and discharging control MOS transistor M1 are both connected to a grid substrate control circuit, and the grid substrate control circuit is coupled with a basic protection circuit; the basic protection circuit also comprises a power-on delay circuit and a logic control circuit, and the lithium battery protection chip enters a self-locking state when being powered on and can normally discharge after being charged and activated.
Description
Technical Field
The invention belongs to the technical field of lithium battery protection, and particularly relates to a lithium battery protection device and system with power-on self-locking function.
Background
In the prior art, lithium battery protection is widely applied, particularly, the lithium battery protection and a main control circuit are arranged on a circuit board, and finally, a battery cell is assembled. After the battery core is assembled, the lithium battery protection chip can be locked and can also be in a conducting state, so that partial products have functions, partial products have no functions, and the customer experience is not good. When the battery core is assembled, the battery core is likely to be electrified unstably to cause repeated electrification, the lithium battery protection chip and the following control circuit are restarted back and forth, logic errors of the lithium battery protection chip and the control circuit are likely to be caused, and the chip is even damaged in serious cases; in order to solve the problems, the application provides a lithium battery protection device and system with power-on self-locking function.
Disclosure of Invention
The invention aims to provide a power-on self-locking lithium battery protection device and system, which can ensure that the lithium battery protection is in a locking state and can not discharge after a battery core is assembled and in the process of assembling the battery core, a rear chip can not be restarted back and forth without input voltage, and the lithium battery protection device and the system can normally work after charging and activating.
The invention provides the following technical scheme:
a lithium battery protection device with power-on self-locking is characterized by comprising a lithium battery protection chip, a lithium battery, a charger, a load, a switch K1 and a switch K2, wherein the lithium battery protection chip comprises a basic protection circuit, a grid substrate control circuit and a charge-discharge control MOS (metal oxide semiconductor) transistor M1; the positive electrode of the lithium battery is connected to one end of a charger or a load through a switch K1 or a switch K2; the other end VM of the charger or the load is connected to one end of a source electrode and a drain electrode of a charge-discharge control MOS tube M1, and the other end of the source electrode and the drain electrode of the charge-discharge control MOS tube M1 is connected to the negative electrode of the lithium battery; the grid electrode and the substrate of the charging and discharging control MOS tube M1 are both connected to a grid electrode substrate control circuit, and the grid electrode substrate control circuit is coupled with a basic protection circuit; the power supply voltage VDD of the basic protection circuit is connected with an RC filter circuit and is connected with the lithium battery through the RC filter circuit; the basic protection circuit further comprises a power-on delay circuit and a logic control circuit, wherein the power-on delay circuit and the logic control circuit ensure that the lithium battery protection chip enters a self-locking state when being powered on and can normally discharge after being charged and activated.
Preferably, the power-on delay circuit comprises a low-voltage judging circuit, a passive delay circuit, an active delay circuit and a latch circuit; the low-voltage judging circuit comprises a resistor R7, a resistor R8, a resistor R9 and a MOS tube M3, the passive delay circuit comprises a resistor R10, a MOS tube M4, a MOS tube M5 and a capacitor C2, the active delay circuit comprises a logic control unit I7 and a logic control unit I8, and the latch circuit comprises a MOS tube M6, a MOS tube M7, a MOS tube M8, a MOS tube M9, a MOS tube M10, a MOS tube M11 and a logic control unit I9; one end of the resistor R7, one end of the resistor R9, the source of the MOS transistor M4, the source of the MOS transistor M6 and the source of the MOS transistor M8 are respectively connected to a supply voltage VDD; one end of the resistor R8, the source electrode of the MOS transistor M3, the source electrode of the MOS transistor M5, one end of the capacitor C2 and the source electrode of the MOS transistor M11 are respectively grounded VGND; the other end of the resistor R7 is connected to the other end of the resistor R8 and the gate of the MOS transistor M3, the other end of the resistor R9 is connected to the drain of the MOS transistor M3, the gate of the MOS transistor M4 and the gate of the MOS transistor M5, the drain of the MOS transistor M4 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the drain of the MOS transistor M5, the other end of the capacitor C2, the Reset ends of the logic control unit I7 and the logic control unit I8, the gate of the MOS transistor M11 and the gate of the MOS transistor M8, the logic control unit I7 and the logic control unit I8 are coupled, and the output end of the logic control unit I8 is connected to the gate of the MOS transistor M6 and the gate of the MOS transistor M9; the input end of the logic control unit I9 is connected to the drain of a MOS tube M8, the drain of a MOS tube M7, the drain of a MOS tube M9 and the drain of a MOS tube M10, and the output end of the logic control unit I9 is connected to the gate of a MOS tube M7 and the gate of a MOS tube M10; the drain of the MOS transistor M6 is connected to the source of the MOS transistor M7, and the source of the MOS transistor M9 is connected to the drain of the MOS transistor M11 and the source of the MOS transistor M10; the output VSD of the logic control unit I9 is the output of the power-on delay circuit.
Preferably, the RC filter circuit comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected to the supply voltage VDD, and the other end of the resistor R1 is connected to the positive electrode of the battery; one end of the capacitor C1 is connected with a supply voltage VDD, and the other end of the capacitor C1 is connected with the cathode of the battery.
Preferably, the basic protection circuit comprises a reference circuit, a discharge short circuit judgment circuit, a discharge overcurrent judgment circuit, a charge overcurrent judgment circuit, an overdischarge voltage judgment circuit, an overcharge voltage judgment circuit, a delay circuit, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a logic control unit I1 and a logic control unit I2; the output end of the reference circuit is respectively connected with the positive input end of the discharge short-circuit judgment circuit, the positive input end of the discharge overcurrent judgment circuit, the negative input end of the charge overcurrent judgment circuit, the negative input end of the over-discharge voltage judgment circuit and the positive input end of the over-charge voltage judgment circuit; the negative input end of the discharge short-circuit judgment circuit, the negative input end of the discharge overcurrent judgment circuit and the positive input end of the charge overcurrent judgment circuit are connected with the other end VM of the charger or the load through a resistor R5; one end of the resistor R2 is connected with a power supply voltage VDD, and the other end of the resistor R2 is connected with the positive input end of the over-discharge voltage judgment circuit and one end of the resistor R3; the other end of the resistor R3 is connected with the negative input end of the overcharge voltage judgment circuit and one end of the resistor R4, and the other end of the resistor R4 is grounded VGND; the output ends of the discharge overcurrent judging circuit, the discharge short circuit judging circuit, the charge overcurrent judging circuit, the over-discharge voltage judging circuit and the over-charge voltage judging circuit are respectively connected with the delay circuit; the input ends of the logic control unit I1 and the logic control unit I2 are respectively coupled with a delay circuit; the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1 and the output end VOD of the logic control unit I2 are respectively the output ends of the basic protection circuit.
Preferably, the logic control circuit comprises a logic control unit I3, a logic control unit I4, a logic control unit I5, a logic control unit I6, a MOS transistor M2 and a resistor R6; the source electrode of the MOS transistor M2 is connected with a power supply voltage VDD, and the drain electrode of the MOS transistor M2 is connected to the VM end of a resistor R5 through a resistor R6; the input end of the logic control unit I3 is respectively connected to the gate of the MOS transistor M2, the output end VSD of the upper delay circuit and the output end VOD of the logic control unit I2; the input end of the logic control unit I4 is respectively connected to the output end of the over-discharge voltage judgment circuit, the output end of the logic control unit I6 and the output end VSD of the power-on delay circuit, and the output end of the logic control unit I4 is connected to the delay circuit; the input end of the logic control unit I5 is connected to the VM end of a resistor R5; the output end of the logic control unit I5 and the output end of the delay circuit are connected to the input end of the logic control unit I6; the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1 and the output end VOD1 of the logic control unit I3 are respectively the output ends of the current basic protection circuit.
A lithium battery protection system with power-on self-locking function comprises the lithium battery protection device.
The invention has the beneficial effects that:
according to the power-on self-locking lithium battery protection device and system, the power-on delay circuit and the control logic are additionally arranged in the basic circuit applied to the conventional battery protection, so that the chip is ensured to enter a self-locking state when being powered on, and the chip can normally discharge after charging activation; therefore, the lithium battery protection is in a locking state and can not discharge after the battery core is assembled and in the battery core assembling process, the chip at the back cannot be restarted back and forth without input voltage, and the battery can normally work after charging and activating.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a basic framework diagram of the present invention;
FIG. 2 is a schematic diagram of a prior art basic protection circuit;
FIG. 3 is a schematic diagram of the basic protection circuit of the present invention;
FIG. 4 is a schematic diagram of a power-on delay circuit;
fig. 5 is a basic framework schematic of discrete battery protection.
Detailed Description
Example 1
As shown in fig. 1, the power-on self-locking lithium battery protection device includes a lithium battery protection chip, a lithium battery, a charger, a load, a switch K1 and a switch K2, where the lithium battery protection chip includes a basic protection circuit, a gate substrate control circuit and a charge-discharge control MOS transistor M1; the positive electrode of the lithium battery is connected to one end of a charger or a load through a switch K1 or a switch K2; the other end VM of the charger or the load is connected to one end of a source electrode and a drain electrode of the charging and discharging control MOS tube M1, and the other end of the source electrode and the drain electrode of the charging and discharging control MOS tube M1 is connected to the negative electrode of the lithium battery; the grid and the substrate of the charging and discharging control MOS tube M1 are both connected to VGATE and VSUB of a grid substrate control circuit, the grid substrate control circuit is coupled with a basic protection circuit, and the basic protection circuit is connected with the grid substrate control circuit through VCHOC1, VOD and VOC; the power supply voltage VDD of the basic protection circuit is connected with an RC filter circuit and is connected with the lithium battery through the RC filter circuit, the RC filter circuit comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the power supply voltage VDD, and the other end of the resistor R1 is connected with the anode of the battery; one end of the capacitor C1 is connected to the supply voltage VDD, and the other end of the capacitor C1 is connected to the negative electrode of the battery.
As shown in fig. 2, the basic protection circuit includes a reference circuit, a discharge short circuit judgment circuit, a discharge overcurrent judgment circuit, a charge overcurrent judgment circuit, an over-discharge voltage judgment circuit, an over-charge voltage judgment circuit, a delay circuit, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a logic control unit I1, and a logic control unit I2; the output end of the reference circuit is respectively connected with the positive input end of the discharge short-circuit judgment circuit, the positive input end of the discharge overcurrent judgment circuit, the negative input end of the charge overcurrent judgment circuit, the negative input end of the over-discharge voltage judgment circuit and the positive input end of the over-charge voltage judgment circuit; the negative input end of the discharge short-circuit judgment circuit, the negative input end of the discharge overcurrent judgment circuit and the positive input end of the charge overcurrent judgment circuit are connected with the other end VM of the charger or the load through a resistor R5; one end of the resistor R2 is connected with the power supply voltage VDD, and the other end of the resistor R2 is connected with the positive input end of the over-discharge voltage judgment circuit and one end of the resistor R3; the other end of the resistor R3 is connected with the negative input end of the overcharge voltage judgment circuit and one end of the resistor R4, and the other end of the resistor R4 is grounded VGND; the output ends of the discharge overcurrent judging circuit, the discharge short circuit judging circuit, the charge overcurrent judging circuit, the over-discharge voltage judging circuit and the over-charge voltage judging circuit are respectively connected with the delay circuit; the input ends of the logic control unit I1 and the logic control unit I2 are respectively coupled with the delay circuit; the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1 and the output end VOD of the logic control unit I2 are output ends of the basic protection circuit, respectively.
As shown in fig. 3, the basic protection circuit further includes a power-on delay circuit and a logic control circuit, and the power-on delay circuit and the logic control circuit ensure that the lithium battery protection chip enters a self-locking state when powered on and can normally discharge after charging activation; the logic control circuit comprises a logic control unit I3, a logic control unit I4, a logic control unit I5, a logic control unit I6, a MOS transistor M2 and a resistor R6; the source electrode of the MOS transistor M2 is connected with a power supply voltage VDD, and the drain electrode of the MOS transistor M2 is connected to the VM end through a resistor R6; the input end of the logic control unit I3 is respectively connected to the gate of the MOS transistor M2, the output end VSD of the upper delay circuit and the output end VOD of the logic control unit I2; the input end of the logic control unit I4 is respectively connected to the output end of the over-discharge voltage judgment circuit, the output end of the logic control unit I6 and the output end VSD of the power-on delay circuit, and the output end VODVP1 of the logic control unit I4 is connected to the delay circuit; the input end of the logic control unit I5 is connected to the VM end; the output end VMN of the logic control unit I5 and the output end VDODV of the delay circuit are connected to the input end of the logic control unit I6; the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1, and the output end VOD1 of the logic control unit I3 are the output ends of the current basic protection circuit, respectively.
When the lithium battery protection chip is powered on, the power-on delay circuit maintains a low level, and outputs a high level after long time delay; the working principle is as follows: when the output VSD of the start-up delay circuit is low: the logic control unit I3 outputs VOD1 as low, VGATE is controlled to be low through a grid substrate control circuit, and therefore a charging and discharging control MOS transistor M1 is turned off; meanwhile, the MOS transistor M2 is controlled to be conducted, the VM is connected to a power supply voltage VDD through a resistor R6 and an MOS transistor M2, the power supply voltage VDD charges a VM end through the MOS transistor M2 and the resistor R6, the voltage of the VM rises, and when the VM rises to a set voltage, the output end VMN of the VM is in a low level through a logic control unit I5; the output end VSD of the power-on delay circuit is low, the output end VODVP1 of the logic control unit I4 is also low, the lithium battery protection chip enters an over-discharge state similarly, and VODV outputs low level after the over-discharge protection delay (40-200 ms).
When the output terminal VMN of the logic control unit I5 is at a low level and the output terminal VDODV of the delay circuit also outputs a low level, the logic control unit I6 outputs a low level, so as to maintain the output terminal VDODV of the delay circuit at a low state and maintain the output terminal VOD1 of the logic control unit I3 at a low state, thereby maintaining the charging and discharging control MOS transistor M1 to be turned off.
In order to ensure self-locking when the chip is powered on, when the output of the power-on delay circuit is required to be high, namely the output end VSD of the power-on delay circuit is changed to be high: the output end VDODV of the over-discharge protection delay circuit is low level, and simultaneously the VMN outputs low level.
As shown in fig. 4, the power-on delay circuit includes a low-voltage determining circuit, a passive delay circuit, an active delay circuit, and a latch circuit; the low-voltage judging circuit comprises a resistor R7, a resistor R8, a resistor R9 and a MOS tube M3, the passive delay circuit comprises a resistor R10, a MOS tube M4, a MOS tube M5 and a capacitor C2, the active delay circuit comprises a logic control unit I7 and a logic control unit I8, and the latch circuit comprises a MOS tube M6, a MOS tube M7, a MOS tube M8, a MOS tube M9, a MOS tube M10, a MOS tube M11 and a logic control unit I9; one end of the resistor R7, one end of the resistor R9, the source of the MOS transistor M4, the source of the MOS transistor M6 and the source of the MOS transistor M8 are respectively connected to the supply voltage VDD; one end of the resistor R8, the source electrode of the MOS transistor M3, the source electrode of the MOS transistor M5, one end of the capacitor C2 and the source electrode of the MOS transistor M11 are respectively grounded VGND; the other end of the resistor R7 is connected to the other end of the resistor R8 and the gate of the MOS transistor M3, the other end of the resistor R9 is connected to the drain of the MOS transistor M3, the gate of the MOS transistor M4 and the gate of the MOS transistor M5, the drain of the MOS transistor M4 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the drain of the MOS transistor M5, the other end of the capacitor C2, the Reset ends of the logic control unit I7 and the logic control unit I8, the gate of the MOS transistor M11 and the gate of the MOS transistor M8, the CLK end of the logic control unit I7 is a clock signal generated inside the chip, the logic control unit I7 is coupled to the logic control unit I8, and the output end of the logic control unit I8 is connected to the gate of the MOS transistor M6 and the gate of the MOS transistor; the input end of the logic control unit I9 is connected to the drain of the MOS transistor M8, the drain of the MOS transistor M7, the drain of the MOS transistor M9 and the drain of the MOS transistor M10, and the output end of the logic control unit I9 is connected to the gate of the MOS transistor M7 and the gate of the MOS transistor M10; the drain of the MOS transistor M6 is connected to the source of the MOS transistor M7, and the source of the MOS transistor M9 is connected to the drain of the MOS transistor M11 and the source of the MOS transistor M10.
The output end VSD of the logic control unit I9 is the output end of the power-on delay circuit, and outputs low level when power-on is started; when the output is high after the time delay set by the power-on time delay circuit, the working principle is as follows:
and the low-voltage judging circuit is used for detecting whether the voltage of the lithium battery can meet the lowest working voltage. When the voltage of the lithium battery is lower than the set voltage: the MOS transistor M3 is turned off, the drain of the MOS transistor M3 outputs a high level, the MOS transistor M4 is turned off, the MOS transistor M5 is turned on, the drain of the MOS transistor M5 outputs a low level, the MOS transistor M8 is turned on, the MOS transistor M11 is turned off, the input end of the logic control unit I9 is at a high level, the output end VSD of the power-on delay circuit outputs a low level, and the charging and discharging control MOS transistor M1 is turned off at the moment.
When the lithium battery voltage is higher than the set voltage: the MOS transistor M3 is turned on, the drain of the MOS transistor M3 is at a low level, the MOS transistor M4 is turned on, the MOS transistor M5 is turned off, the power supply voltage VDD charges the capacitor C2 through the MOS transistor M4 and the resistor R10, and after a set time delay, the drain of the MOS transistor M5 becomes high.
When the output (drain of the MOS transistor M5) of the RC filter circuit is high, the active delay circuit starts to time, where CLK of the logic control unit I7 is generated in the lithium battery protection delay circuit, and when the set delay is passed, the output of the Q terminal of the logic control unit I8 changes from low level to high level.
When the Q terminal of the logic control unit I8 outputs a high level, the MOS transistor M6 is turned off, the MOS transistor M9 is turned on, and the MOS transistor M11 is originally turned on, so that the input terminal of the logic control unit I9 is pulled low, the output terminal (VSD) of the logic control unit I9 is high, and the MOS transistor M10 is turned on. At this time, even if the Q terminal of the logic control unit I8 outputs a low level, the input terminal of the logic control unit I8 is connected to VGND due to the conduction of the MOS transistor M10 and the MOS transistor M11, and the output terminal VSD of the logic control unit I9 also outputs a high level.
The application also comprises a lithium battery protection system with the power-on self-locking function, and the lithium battery protection system comprises the lithium battery protection device.
Example 2
As shown in fig. 5, the power-on self-locking lithium battery protection device of the present application can also be adapted to a discrete lithium battery protection scheme; the connection relationship is as follows:
the circuit comprises a discrete battery protection circuit, a switch MOS (metal oxide semiconductor) tube, a resistor R11, a lithium battery, a charger, a load, a switch K1 and a switch K2, wherein the discrete battery protection circuit comprises a basic protection circuit and a charging driving control circuit; the switching MOS tube comprises an MOS tube M12 and an MOS tube M13.
The positive electrode of the lithium battery is connected to one end of a charger or a load through a switch K1 or a switch K2; the other end VM of the charger or the load is connected to the source electrode and the substrate of the MOS tube M13, the drain electrode of the MOS tube M13 is connected with the drain electrode of the MOS tube M12, and the source electrode and the substrate of the MOS tube M12 are connected to the negative electrode of the lithium battery; the VM end is respectively connected to the basic protection circuit and the charging driving control circuit through a resistor R11, the VOC end of the basic protection circuit is connected to the charging driving control circuit, the VOD end of the basic protection circuit is connected to the grid electrode of the MOS tube M12, and the VOC1 end of the charging driving control circuit is connected to the grid electrode of the MOS tube M13;
the power supply voltage VDD of the basic protection circuit is connected with the RC filter circuit and is connected with the lithium battery through the RC filter circuit; the basic protection circuit also comprises a power-on delay circuit and a logic control circuit, wherein the power-on delay circuit and the logic control circuit ensure that the lithium battery protection chip enters a self-locking state when being powered on and can normally discharge after being charged and activated.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A lithium battery protection device with power-on self-locking is characterized by comprising a lithium battery protection chip, a lithium battery, a charger, a load, a switch K1 and a switch K2, wherein the lithium battery protection chip comprises a basic protection circuit, a grid substrate control circuit and a charge-discharge control MOS (metal oxide semiconductor) transistor M1;
the positive electrode of the lithium battery is connected to one end of a charger or a load through a switch K1 or a switch K2; the other end VM of the charger or the load is connected to one end of a source electrode and a drain electrode of a charge-discharge control MOS tube M1, and the other end of the source electrode and the drain electrode of the charge-discharge control MOS tube M1 is connected to the negative electrode of the lithium battery;
the grid electrode and the substrate of the charging and discharging control MOS tube M1 are both connected to a grid electrode substrate control circuit, and the grid electrode substrate control circuit is coupled with a basic protection circuit; the power supply voltage VDD of the basic protection circuit is connected with an RC filter circuit and is connected with the lithium battery through the RC filter circuit;
the basic protection circuit also comprises a power-on delay circuit and a logic control circuit, wherein the power-on delay circuit and the logic control circuit ensure that the lithium battery protection chip enters a self-locking state when being powered on and can normally discharge after being charged and activated;
the power-on delay circuit comprises a low-voltage judging circuit, a passive delay circuit, an active delay circuit and a latch circuit;
the low-voltage judging circuit comprises a resistor R7, a resistor R8, a resistor R9 and a MOS tube M3, the passive delay circuit comprises a resistor R10, a MOS tube M4, a MOS tube M5 and a capacitor C2, the active delay circuit comprises a logic control unit I7 and a logic control unit I8, and the latch circuit comprises a MOS tube M6, a MOS tube M7, a MOS tube M8, a MOS tube M9, a MOS tube M10, a MOS tube M11 and a logic control unit I9;
one end of the resistor R7, one end of the resistor R9, the source of the MOS transistor M4, the source of the MOS transistor M6 and the source of the MOS transistor M8 are respectively connected to a supply voltage VDD; one end of the resistor R8, the source electrode of the MOS transistor M3, the source electrode of the MOS transistor M5, one end of the capacitor C2 and the source electrode of the MOS transistor M11 are respectively grounded VGND;
the other end of the resistor R7 is connected to the other end of the resistor R8 and the gate of the MOS transistor M3, the other end of the resistor R9 is connected to the drain of the MOS transistor M3, the gate of the MOS transistor M4 and the gate of the MOS transistor M5, the drain of the MOS transistor M4 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the drain of the MOS transistor M5, the other end of the capacitor C2, the Reset ends of the logic control unit I7 and the logic control unit I8, the gate of the MOS transistor M11 and the gate of the MOS transistor M8, the logic control unit I7 and the logic control unit I8 are coupled, and the output end of the logic control unit I8 is connected to the gate of the MOS transistor M6 and the gate of the MOS transistor M9;
the input end of the logic control unit I9 is connected to the drain of a MOS tube M8, the drain of a MOS tube M7, the drain of a MOS tube M9 and the drain of a MOS tube M10, and the output end of the logic control unit I9 is connected to the gate of a MOS tube M7 and the gate of a MOS tube M10; the drain of the MOS transistor M6 is connected to the source of the MOS transistor M7, and the source of the MOS transistor M9 is connected to the drain of the MOS transistor M11 and the source of the MOS transistor M10;
the output VSD of the logic control unit I9 is the output of the power-on delay circuit.
2. The power-on self-locking lithium battery protection device as claimed in claim 1, wherein the RC filter circuit comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected to a supply voltage VDD, and the other end of the resistor R1 is connected to the positive electrode of the lithium battery; one end of the capacitor C1 is connected with a power supply voltage VDD, and the other end of the capacitor C1 is connected with the negative electrode of the lithium battery.
3. The power-on self-locking lithium battery protection device as claimed in claim 1, wherein the basic protection circuit comprises a reference circuit, a discharge short circuit judgment circuit, a discharge overcurrent judgment circuit, a charge overcurrent judgment circuit, an over-discharge voltage judgment circuit, an overcharge voltage judgment circuit, a delay circuit, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a logic control unit I1 and a logic control unit I2;
the output end of the reference circuit is respectively connected with the positive input end of the discharge short-circuit judgment circuit, the positive input end of the discharge overcurrent judgment circuit, the negative input end of the charge overcurrent judgment circuit, the negative input end of the over-discharge voltage judgment circuit and the positive input end of the over-charge voltage judgment circuit;
the negative input end of the discharge short-circuit judgment circuit, the negative input end of the discharge overcurrent judgment circuit and the positive input end of the charge overcurrent judgment circuit are connected with the other end VM of the charger or the load through a resistor R5;
one end of the resistor R2 is connected with a power supply voltage VDD, and the other end of the resistor R2 is connected with the positive input end of the over-discharge voltage judgment circuit and one end of the resistor R3; the other end of the resistor R3 is connected with the negative input end of the overcharge voltage judgment circuit and one end of the resistor R4, and the other end of the resistor R4 is grounded VGND;
the output ends of the discharge overcurrent judging circuit, the discharge short circuit judging circuit, the charge overcurrent judging circuit, the over-discharge voltage judging circuit and the over-charge voltage judging circuit are respectively connected with the delay circuit;
the input ends of the logic control unit I1 and the logic control unit I2 are respectively coupled with a delay circuit;
the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1 and the output end VOD of the logic control unit I2 are respectively the output ends of the basic protection circuit.
4. The power-on self-locking lithium battery protection device as claimed in claim 3, wherein the logic control circuit comprises a logic control unit I3, a logic control unit I4, a logic control unit I5, a logic control unit I6, a MOS transistor M2 and a resistor R6;
the source electrode of the MOS transistor M2 is connected with a power supply voltage VDD, and the drain electrode of the MOS transistor M2 is connected to the VM end of a resistor R5 through a resistor R6;
the input end of the logic control unit I3 is respectively connected to the gate of the MOS transistor M2, the output end VSD of the upper delay circuit and the output end VOD of the logic control unit I2;
the input end of the logic control unit I4 is respectively connected to the output end of the over-discharge voltage judgment circuit, the output end of the logic control unit I6 and the output end VSD of the power-on delay circuit, and the output end of the logic control unit I4 is connected to the delay circuit;
the input end of the logic control unit I5 is connected to the VM end of a resistor R5; the output end of the logic control unit I5 and the output end of the delay circuit are connected to the input end of the logic control unit I6;
the output end VCHOC1 of the charging overcurrent judging circuit, the output end VOC of the logic control unit I1 and the output end VOD1 of the logic control unit I3 are respectively the output ends of the current basic protection circuit.
5. A lithium battery protection system with self-locking when power is supplied, characterized in that the lithium battery protection system comprises a lithium battery protection device according to any one of claims 1 to 4.
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