CN212909028U - Lithium battery protection circuit with low standby power consumption - Google Patents
Lithium battery protection circuit with low standby power consumption Download PDFInfo
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- CN212909028U CN212909028U CN202021422616.5U CN202021422616U CN212909028U CN 212909028 U CN212909028 U CN 212909028U CN 202021422616 U CN202021422616 U CN 202021422616U CN 212909028 U CN212909028 U CN 212909028U
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Abstract
The utility model discloses a lithium battery protection circuit with low standby power consumption, which comprises a standby control circuit, a battery protection circuit, a lithium battery and a charging and discharging terminal, wherein the anode of the charging and discharging terminal is connected with the anode of the lithium battery through the battery protection circuit; the negative pole of charge-discharge terminal passes through battery protection circuit to be connected with the lithium cell negative pole, still is connected with standby control circuit on the battery protection circuit, and standby control circuit still is connected with control signal, the utility model discloses can be less than control protection circuit after prohibiting the charging voltage value and cut off charging circuit at lithium cell voltage, forbid for lithium cell charging, realize 0V and charge forbidding function, reach the effect of maintaining lithium cell security and stability. The circuit can be controlled by software and hardware, and has the characteristics of low cost, low power consumption, small voltage drop and high safety.
Description
Technical Field
The utility model relates to the technical field of batteries, specifically a lithium battery protection circuit of standby low-power consumption.
Background
In various electronic products, a power supply of a plurality of products is supplied by a lithium battery, and the lithium battery can continuously consume the electric quantity of the battery due to the power consumption of an internal protection circuit after being produced; if the battery is stored for a long time or the user does not charge the battery for a long time, the internal protection circuit of the battery can consume the residual electric quantity in the battery completely, so that the lithium battery is overdischarged, the cycle life of the battery is shortened, and the use experience of a client is influenced.
The existing lithium battery pack hardware protection circuits all need to enter a dormant low-power consumption state after a battery enters overdischarge protection, but the overdischarge of the lithium battery still has certain influence on the cycle life; the software protection scheme can control the lithium battery to enter a dormant low-power-consumption state at any time, but software control of the single chip microcomputer is required to be added, and the cost of the whole circuit is increased by adding the single chip microcomputer and a software program.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a lithium battery protection circuit of standby low-power consumption to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a lithium battery protection circuit with low standby power consumption comprises a standby control circuit, a battery protection circuit, a lithium battery and a charge and discharge terminal, wherein the positive electrode of the charge and discharge terminal is connected with the positive electrode of the lithium battery through the battery protection circuit; the negative electrode of the charge and discharge terminal is connected with the negative electrode of the lithium battery through a battery protection circuit, the battery protection circuit is also connected with a standby control circuit, and the standby control circuit is also connected with a control signal.
As a further technical solution of the present invention: the charging and discharging terminal comprises an interface J1, the battery protection circuit comprises a chip U1, a switching tube Q1, a switching tube Q2, a capacitor C14 and a capacitor C15, the standby control circuit comprises a resistor R12, a resistor R19 and a switching tube Q5, one end of the interface J1 is connected with the capacitor C7 and a fuse F1, the other end of the capacitor C7 is connected with the capacitor C8, the other end of the capacitor C8 is connected with the anode of a diode DZ4, the resistor R21, the capacitor C14, one end of a resistor R15, the other end of the interface J1 and the source of the switching tube Q2, the other end of the fuse F1 is connected with the anode of a diode D1, the resistor R2 and the anode of a battery B3, the cathode of the diode D1 is connected with the resistor R1, the other end of the resistor R1 is connected with the capacitor C1, the cathode of the diode DZ1, the voltage of the diode DZ1, the VDD 20 and the pin of the chip U1, the cathode of the battery B1 are connected with the resistor B1, the other end of the resistor R3 is connected with the capacitor C3 and the pin 18 of the chip U1, the negative electrode of the battery B2 is connected with the positive electrode of the battery B1 and the resistor R4, the other end of the resistor R4 is connected with the capacitor C4 and the pin 17 of the chip U1, the negative electrode of the battery B1 is connected with the positive electrode of the battery B0 and the resistor R5, the other end of the resistor R5 is connected with the capacitor C5 and the pin 16 of the chip U1, the negative electrode of the battery B0 is connected with the anode of the diode DZ1, the resistor Rs1, one end of the resistor R14, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5, the pin 11 of the chip U5 is connected with the resistor RT 5 and the other end of the capacitor C5, the other end of the resistor RT 5 and the other end of the resistor R5 are connected with the source of the transistor Q5, the source of the switch Q5 and the transistor R5, the other end of the resistor R24 is connected with the drain of the switch tube Q5, the gate of the switch tube Q5 is connected with the resistor R12 and the resistor R19, the other end of the resistor R12 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the control signal PACKEN, the other end of the resistor R19 is connected with the drain of the switch tube Q5 and the grounding terminal, the other end of the resistor Rs1 is connected with the anode of the diode DZ3, the resistor R13 and the resistor R20, a capacitor C15 and a source electrode of the switching tube Q1, a pin 4 of the chip U1 is connected with a drain electrode of the switching tube Q1 and a drain electrode of the switching tube Q2 through a resistor R16, a pin 3 of the chip U1 is connected with the other end of a resistor R15, a pin 5 of the chip U1 is connected with the other end of a resistor R21, a cathode of a diode ZD4 and a gate of the switching tube Q2 through a resistor R17, the other end of the capacitor C14 is connected with the other end of a capacitor C15, and a pin 6 of the chip U1 is connected with the other end of a resistor R20, the cathode of a diode DZ3 and the gate of the switching tube Q1 through a.
As a further technical solution of the present invention: the switching tube Q5 is an N-channel field effect tube or an audion, and the switching tube Q6 is a P-channel field effect tube or an audion.
As a further technical solution of the present invention: the resistor RT1 is a thermistor.
As a further technical solution of the present invention: the model number of the chip U1 is SH36710X series.
As a further technical solution of the present invention: the battery B0, the battery B1, the battery B2 and the battery B3 are all lithium batteries.
As a further technical solution of the present invention: the switching tube Q1 is a MOS tube.
As a further technical solution of the present invention: the switching tube Q2 is a MOS tube.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can use hardware protection circuit to make the lithium cell get into the dormant state at any time, reduce lithium battery circuit's static consumption, prolong lithium cell stand-by time, reach the effect of guaranteeing battery cycle life and user experience. The circuit is a hardware storage circuit, can be controlled by software and also can be controlled by hardware, and has the characteristics of low cost, low power consumption, small voltage drop and high safety.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, in embodiment 1, a standby low-power-consumption lithium battery protection circuit includes a standby control circuit, a battery protection circuit, a lithium battery, and a charge/discharge terminal, wherein an anode of the charge/discharge terminal is connected to an anode of the lithium battery through the battery protection circuit; the negative electrode of the charge and discharge terminal is connected with the negative electrode of the lithium battery through a battery protection circuit, the battery protection circuit is also connected with a standby control circuit, and the standby control circuit is also connected with a control signal.
As shown in fig. 2, the charging and discharging terminal includes an interface J1, the battery protection circuit includes a chip U1, a switch tube Q1, a switch tube Q2, a capacitor C14 and a capacitor C15, the standby control circuit includes a resistor R12, a resistor R19 and a switch tube Q5, one end of the interface J1 is connected to a capacitor C7 and a fuse F1, the other end of the capacitor C7 is connected to a capacitor C8, the other end of the capacitor C8 is connected to the anode of a diode DZ4, a resistor R21, a capacitor C14, one end of a resistor R15, the other end of the interface J1 and the source of the switch tube Q2, the other end of the fuse F1 is connected to the anode of a diode D1, the resistor R2 and the anode of a battery B3, the cathode of the diode D1 is connected to the resistor R1, the other end of the resistor R1 is connected to the cathode of the diode DZ1, the cathode of the resistor R1 is connected to the anode of the capacitor C1 and the resistor R1 of the chip U1, the other end of the resistor R3 is connected with the capacitor C3 and the pin 18 of the chip U1, the negative electrode of the battery B2 is connected with the positive electrode of the battery B1 and the resistor R4, the other end of the resistor R4 is connected with the capacitor C4 and the pin 17 of the chip U1, the negative electrode of the battery B1 is connected with the positive electrode of the battery B0 and the resistor R5, the other end of the resistor R5 is connected with the capacitor C5 and the pin 16 of the chip U1, the negative electrode of the battery B0 is connected with the anode of the diode DZ1, the resistor Rs1, one end of the resistor R14, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4 and the other end of the capacitor C5, the pin 11 of the chip U5 is connected with the resistor RT 5 and the other end of the capacitor C5, the other end of the resistor RT 5 and the other end of the resistor R5 are connected with the source of the transistor Q5, the source of the switch Q5 and the transistor R5, the other end of the resistor R24 is connected with the drain of the switch tube Q5, the gate of the switch tube Q5 is connected with the resistor R12 and the resistor R19, the other end of the resistor R12 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the control signal PACKEN, the other end of the resistor R19 is connected with the drain of the switch tube Q5 and the grounding terminal, the other end of the resistor Rs1 is connected with the anode of the diode DZ3, the resistor R13 and the resistor R20, a capacitor C15 and a source electrode of the switching tube Q1, a pin 4 of the chip U1 is connected with a drain electrode of the switching tube Q1 and a drain electrode of the switching tube Q2 through a resistor R16, a pin 3 of the chip U1 is connected with the other end of a resistor R15, a pin 5 of the chip U1 is connected with the other end of a resistor R21, a cathode of a diode ZD4 and a gate of the switching tube Q2 through a resistor R17, the other end of the capacitor C14 is connected with the other end of a capacitor C15, and a pin 6 of the chip U1 is connected with the other end of a resistor R20, the cathode of a diode DZ3 and the gate of the switching tube Q1 through a.
Q6 in the standby control circuit is a P-channel field effect transistor for switching off a VDD level signal loop; r23 is Q6 pull-up resistor, and plays a role in discharging; r24 is a low level signal current limiting resistor; r11 is a VDD level signal current limiting resistor; the Q5 is an N-channel field effect transistor which provides low-level signal action for the Q6; r19 is Q5 pull-down resistor, and also plays a role in discharging; r12 is a control level signal input current limiting resistor; d2 is the function of limiting the direction of current flow and preventing current flow from exceeding the direction of the input end output.
In the battery protection circuit, the Pin1 of the U1 is CTLC, and when the Pin is VDD level, the U1 controls the Q2 to be in a normal protection state; when the pin is in a floating or GND level, the U1 controls the Q2 to be in an off state; in the battery protection circuit, Pin2 of U1 is a CTLD, and when the Pin is VDD level, U1 controls Q1 to be in a normal protection state; when the pin is in a floating or GND level, the U1 controls the Q1 to be in an off state; when the U1 in the battery protection circuit controls the Q1 and the Q2 to be in an off state at the same time, the U1 enters a low power consumption mode, the static power consumption of the whole protection circuit is extremely low, and the standby time of the battery is greatly prolonged;
when the input of PACK _ EN is a high-level signal, the G pole of Q5 is at a high level, the D, S pole of Q5 is in a conducting state, the G pole of Q6 is pulled low, so that the D, S pole of Q6 is also in a conducting state, the voltage of Pin1 CTLC and Pin2 CTLD of U1 are both equal to VDD, and the battery protection circuit is in a normal working state;
when the input of PACK _ EN is a low-level signal, the G pole of Q5 is at a low level, the D, S pole of Q5 is in an off state, the G pole of Q6 is pulled up to a VDD level, the D, S pole of Q6 is in an off state, the Pin1 CTLC and the Pin2 CTLD of U1 are both in a floating state, and U1 controls Q1 and Q2 to be in an off state, so that the whole battery enters a low-power-consumption mode.
In embodiment 2, based on embodiment 1, the switching transistor Q5 adopted in the design can be replaced by an NPN triode; q6 may be replaced by a PNP transistor.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A lithium battery protection circuit with low standby power consumption comprises a standby control circuit, a battery protection circuit, a lithium battery and a charging and discharging terminal, and is characterized in that the anode of the charging and discharging terminal is connected with the anode of the lithium battery through the battery protection circuit; the negative electrode of the charge and discharge terminal is connected with the negative electrode of the lithium battery through a battery protection circuit, the battery protection circuit is also connected with a standby control circuit, and the standby control circuit is also connected with a control signal.
2. The lithium battery protection circuit with low standby power consumption according to claim 1, wherein the charge/discharge terminal comprises an interface J, the battery protection circuit comprises a chip U, a switch tube Q, a capacitor C and a capacitor C, the standby control circuit comprises a resistor R, a resistor R and a switch tube Q, one end of the interface J is connected with the capacitor C and a fuse F, the other end of the capacitor C is connected with the capacitor C, the other end of the capacitor C is connected with the anode of a diode DZ, the resistor R, the capacitor C, one end of the resistor R, the other end of the interface J and the source electrode of the switch tube Q, the other end of the fuse F is connected with the anode of the diode D, the resistor R and the anode of the battery B, the cathode of the diode D is connected with the resistor R, the other end of the resistor R is connected with the cathode of the capacitor C, the cathode of the diode DZ, the voltage VDD and the pin 20 of the chip U, the other end of the resistor R2 is connected with a capacitor C2 and a pin 19 of a chip U1, the other end of the resistor R3 is connected with a capacitor C3 and a pin 18 of a chip U1, the negative electrode of the battery B2 is connected with the positive electrode of a battery B1 and a resistor R4, the other end of the resistor R4 is connected with a capacitor C4 and a pin 17 of a chip U1, the negative electrode of a battery B1 is connected with the positive electrode of a battery B0 and a resistor R5, the other end of the resistor R5 is connected with a capacitor C5 and a pin 16 of a chip U1, the negative electrode of a battery B0 is connected with the anode of a diode DZ1, the resistor Rs1, one end of the resistor R14, the other end of the capacitor C14 and the other end of the capacitor C14, a pin 11 of the chip U14 is connected with a resistor RT 14 and a drain of the resistor R14, a drain of the switch R14 is connected with a gate of the chip U14 and a switch Q14, the other end of the resistor R is connected with the source electrode of the switching tube Q and the voltage VDD, the other end of the resistor R is connected with the drain electrode of the switching tube Q, the grid electrode of the switching tube Q is connected with the resistor R and the resistor R, the other end of the resistor R is connected with the cathode of the diode D, the anode of the diode D is connected with the control signal PACKEN, the other end of the resistor R is connected with the drain electrode and the grounding end of the switching tube Q, the other end of the resistor Rs is connected with the anode of the diode DZ, the resistor R, the capacitor C and the source electrode of the switching tube Q, the pin 4 of the chip U is connected with the drain electrode of the switching tube Q through the resistor R, the pin 3 of the chip U is connected with the other end of the resistor R, the pin 5 of the chip U is connected with the other end of the resistor R, the cathode of the diode ZD and the grid electrode of the switching tube Q through the, The cathode of the diode DZ3 and the gate of the switching tube Q1.
3. The lithium battery protection circuit with low standby power consumption as claimed in claim 2, wherein the switching transistor Q5 is an N-channel fet or a triode, and the switching transistor Q6 is a P-channel fet or a triode.
4. The lithium battery protection circuit with low standby power consumption as claimed in claim 2, wherein the resistor RT1 is a thermistor.
5. The lithium battery protection circuit with low standby power consumption as claimed in claim 2, wherein the chip U1 is SH36710X series.
6. The lithium battery protection circuit with low standby power consumption according to claim 2, wherein the battery B0, the battery B1, the battery B2 and the battery B3 are all lithium batteries.
7. The lithium battery protection circuit with low standby power consumption as claimed in claim 2, wherein the switching transistor Q1 is a MOS transistor.
8. The lithium battery protection circuit with low standby power consumption as claimed in claim 2, wherein the switching transistor Q2 is a MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021422616.5U CN212909028U (en) | 2020-07-17 | 2020-07-17 | Lithium battery protection circuit with low standby power consumption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021422616.5U CN212909028U (en) | 2020-07-17 | 2020-07-17 | Lithium battery protection circuit with low standby power consumption |
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| CN212909028U true CN212909028U (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021422616.5U Active CN212909028U (en) | 2020-07-17 | 2020-07-17 | Lithium battery protection circuit with low standby power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552538A (en) * | 2022-03-15 | 2022-05-27 | 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 |
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2020
- 2020-07-17 CN CN202021422616.5U patent/CN212909028U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552538A (en) * | 2022-03-15 | 2022-05-27 | 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 |
| 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 |
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