TWI539720B - Power battery management system with low power state auto wake-up function - Google Patents

Description

Power battery management system with automatic wake-up function in low power state System

The present invention relates to the technical field of power battery management systems, and in particular to a power battery management system having an automatic wake-up function with a low power consumption state.

With the increasing awareness of environmental protection, power rechargeable batteries (referred to as power batteries) are becoming more and more popular in power tools such as electric tools and electric bicycles. In order to prevent the power battery from being overcharged during charging (ie, overcharged state), and during discharge, the discharge voltage is too low (ie, overdischarged), the power battery needs a power battery protection board for protection, but the power battery The problems that the protection board appears in use are becoming more and more prominent.

The scheme of the power battery protection board is mainly divided into two categories: 1) a pure hardware protection scheme, which can achieve a low power consumption in a low power state, but the protection threshold of the scheme is fixed and cannot be arbitrarily changed, and the application is subject to certain Restriction; 2) With a single-chip protection scheme, that is, the power battery management system solution, the power consumption will be large in the static state, that is, without the charger and the load state. If the user is not broken after normal use When the load is turned on, the battery pack is always discharged. After the over-discharge protection, the power consumption will reach the order of milliamperes (mA). The direct consequence is that the battery pack is charged after a short period of time. It will run out and greatly reduce the battery life.

In the long-term storage or long-distance transportation process of the power battery management system, in order to reduce the power consumption of the system, the switch is generally used to cut off the connection between the battery pack and the protection board, so that the power consumption is reduced to the micro-ampere (μA) level. When it is required to wake up from a low power state, it is necessary to manually close the switch, which is cumbersome to use.

One technical problem to be solved by the present invention is to provide a power battery management system with an automatic wake-up function of a low power consumption state, which can protect the battery pack from being over-discharged after the user has not disconnected the load after normal use. It enters a low power state.

Another technical problem to be solved by the present invention is to provide a power battery management system having a low power consumption state automatic wake-up function, which can automatically wake up from a low power consumption state.

To solve the above technical problem, the present invention provides a power battery management system with a low power consumption state automatic wake-up function, which is connected to a battery pack, including: a single-chip, a voltage regulator module, and a wake-up circuit module. a unit, a discharge protection module, a charging protection module, and a sampling resistor; wherein the single chip controls the entire power battery management system, the power of the single chip is provided by the voltage regulator module, and the single The chip can cut off the output of the voltage regulator module according to a voltage drop across the sampling resistor; A charger is connected between the positive end of the battery pack and the charging protection module, and a load is connected between the positive end of the battery pack and the discharge protection module, and the charging protection module passes the a discharge protection module and the sampling resistor are connected to a negative end of the battery pack; when a voltage drop across the sampling resistor is zero, or a total voltage of the battery pack is lower than a low voltage voltage value, the single The wafer cuts off the output of the voltage regulator module to bring the power battery management system into a low power state.

Optionally, after the charger is accessed, the normal output of the voltage regulator module is automatically controlled by the wake-up circuit module, and the low power consumption state is automatically awakened; or.

When the total voltage of the battery pack is higher than the low voltage voltage value, after the load is connected, the normal output of the voltage regulator module is automatically controlled by the wake-up circuit module, and the low power consumption state is automatically wake.

Optionally, the wake-up circuit module includes: a voltage regulator module switch circuit, including a first PNP transistor, a first NPN transistor, and a first resistor; wherein an emitter connection of the first PNP transistor a positive pole of the battery pack, a collector of the first PNP transistor is connected to a positive end of the voltage regulator module, and a negative terminal of the voltage regulator module is connected to a negative pole of the battery pack, the first PNP a base of the transistor is connected to a collector of the first NPN transistor through the first resistor, an emitter of the first NPN transistor is connected to a cathode of the battery pack; and a wake-up module of the charger includes a second PNP transistor, a second resistor, and a third resistor; wherein a base of the second PNP transistor is connected to a negative terminal of the charger through the third resistor, and a positive terminal of the charger is connected to the a positive electrode of the battery pack, an emitter of the second PNP transistor is also connected to a positive electrode of the battery pack, a collector of the second PNP transistor is coupled to a base of the first NPN transistor through the second resistor; a load wake-up module including a fourth resistor, a fifth resistor, and a first Zener diode; a negative end of the load is connected to a negative end of the first Zener diode, a positive end of the load is connected to a positive pole of the battery pack, and a positive end of the first Zener diode passes the A fifth resistor is coupled to a base of the first NPN transistor, and a base of the first NPN transistor is coupled to a cathode of the battery through the fourth resistor.

Optionally, the wake-up circuit module includes: a voltage regulator module switch circuit, including a first PNP transistor, a first NPN transistor, and a first resistor; wherein an emitter connection of the first PNP transistor a positive pole of the battery pack, a collector of the first PNP transistor is connected to a positive end of the voltage regulator module, and a negative terminal of the voltage regulator module is connected to a negative pole of the battery pack, the first PNP a base of the transistor is connected to a collector of the first NPN transistor through the first resistor, an emitter of the first NPN transistor is connected to a cathode of the battery pack; and a wake-up module of the charger includes a PNP transistor, a third resistor, and a first diode; wherein a base of the second PNP transistor is connected to a negative terminal of the charger through the third resistor, and a positive terminal of the charger is connected The anode of the battery pack, the emitter of the second PNP transistor is also connected to the anode of the battery pack, and the collector of the second PNP transistor is connected to the positive terminal of the first diode; a module including a fourth resistor, a fifth resistor, a sixth resistor, a first Zener diode, and a second a pole body; wherein a negative end of the load is connected to a negative end of the first Zener diode, a positive end of the load is connected to a positive pole of the battery pack, and a positive side of the first Zener diode Connecting the second through the fifth resistor a positive terminal of the diode, a negative terminal of the second diode is connected to a negative terminal of the first diode, and a base of the first NPN transistor is connected through the sixth resistor, The positive terminal of the second diode is connected to the negative electrode of the battery pack through the fourth resistor.

Optionally, the wake-up circuit module includes: a voltage regulator module switch circuit, including a first PNP transistor, a first NPN transistor, and a first resistor; wherein an emitter connection of the first PNP transistor a positive pole of the battery pack, a collector of the first PNP transistor is connected to a positive end of the voltage regulator module, and a negative terminal of the voltage regulator module is connected to a negative pole of the battery pack, the first PNP a base of the transistor is connected to a collector of the first NPN transistor through the first resistor, an emitter of the first NPN transistor is connected to a cathode of the battery pack; a charger wake-up module or a load wake-up mode a group comprising a second NPN transistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, a first Zener diode, and a first diode; wherein the seventh resistor and the The eighth resistor is connected in series and connected between the positive electrode and the negative electrode of the battery pack, and the collector of the second NPN transistor is connected to the base of the first PNP transistor through the first resistor, the second a base of the NPN transistor is connected between the seventh resistor and the eighth resistor, the second NPN An emitter of the crystal is connected to a positive end of the first diode; the fourth resistor is connected between a base of the first NPN transistor and a cathode of the battery, the first Zener a positive terminal of the pole body is connected to a base of the first NPN transistor through the fifth resistor, and a negative end of the first Zener diode and a negative terminal of the first diode are commonly connected to the The charger or the negative terminal of the load, the charger or the positive terminal of the load is connected to the positive pole of the battery pack.

Optionally, if the battery pack is in an over-discharge state and the load is always connected, the low-voltage voltage value is passed through the fourth resistor, the fifth resistor And the type of the Zener diode is set.

Compared with the prior art, the invention has the following advantages: the invention improves the scheme of the power battery management system: 1) the problem that the power consumption of the original scheme is always large after the over-discharge state protection is always connected to the load. In this case, when the battery pack voltage is lower than the low voltage voltage value (the low voltage voltage value can be freely set by the component parameters in the circuit), the power battery management system enters a low power consumption state, and the power consumption is maximum. 1μA; 2) For the original scheme, the switch is used to wake up the low power state, the invention eliminates the switching device, and the charger can automatically wake up the low power state; if the battery voltage is higher than the low voltage voltage, The load can also automatically wake up the low power state.

The circuit component of the invention is small and easy to implement, greatly prolonging the service life of the battery pack, and the charger or the load can automatically wake up the low power consumption state, which is simple and practical.

In summary, the present invention enables the power battery management system to be connected to the load while the battery pack voltage is low, and can also enter a low power consumption state, greatly extending the service life of the battery pack, and eliminating the switching device. The charger or load can automatically wake up the low power state, making the power battery management system simple and practical.

1‧‧‧ single chip

2‧‧‧voltage regulator

3‧‧‧Wake-up circuit module

4‧‧‧Charger

5‧‧‧load

6‧‧‧Discharge protection module

7‧‧‧Charging protection module

8‧‧‧Battery Pack

100‧‧‧Power Battery Management System

201‧‧‧Regulator module switching circuit

202‧‧‧Charge wake-up module

203‧‧‧Load wake-up module

D1‧‧‧First Zener diode

D2‧‧‧ first diode

D3‧‧‧Secondary

Q1‧‧‧First PNP transistor

Q2‧‧‧First NPN transistor

Q3‧‧‧Second PNP transistor

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

R4‧‧‧fourth resistor

R5‧‧‧ fifth resistor

R7‧‧‧ seventh resistor

R8‧‧‧ eighth resistor

R6‧‧‧ sixth resistor

R _Sense ‧‧‧Sampling resistor

The above and other features, aspects and advantages of the present invention will become more apparent from the description of the appended claims.

FIG. 1 is a schematic structural diagram of a module of a power battery management system with an automatic wake-up function of a low power consumption state according to an embodiment of the present invention.

2 is a schematic structural view of a wake-up circuit module and its surrounding circuits in the power battery management system of the embodiment shown in FIG. 1.

FIG. 3 is a schematic structural diagram of a wake-up circuit module and its surrounding circuits in a power battery management system according to another embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a wake-up circuit module and its surrounding circuits in a power battery management system according to still another embodiment of the present invention.

The present invention will be further described in detail in the following description of the embodiments of the invention, A person skilled in the art can make similar promotion and deduction according to the actual application without departing from the connotation of the present invention. Therefore, the scope of the present invention should not be limited by the content of the specific embodiment.

FIG. 1 is a schematic structural diagram of a module of a power battery management system with an automatic wake-up function of a low power consumption state according to an embodiment of the present invention. It should be noted that this and the following other figures are only examples, and should not be construed as limiting the scope of the invention as claimed. As shown in FIG. 1 , the power battery management system 100 is connected to a battery pack 8 , and mainly includes: a single chip 1 , a voltage regulator module 2 , a wake-up circuit module 3 , a discharge protection module 6 , and a charging protection module . Group 7 and sampling resistor R _Sense .

The single chip 1 controls the entire power battery management system 100. The power of the single chip 1 is provided by the voltage regulator module 2, and the single chip 1 can cut off the voltage according to the voltage drop across the sampling resistor R _Sense . The output of the voltage regulator module 2. A charger 4 can be connected between the positive end of the battery pack 8 and the charging protection module 7, and a load 5 can be connected between the positive end of the battery pack 8 and the discharge protection module 6. The charging protection module 7 is connected to the negative end of the battery pack 8 via the discharge protection module 6 and the sampling resistor R _Sense .

When the voltage drop across the sampling resistor R _Sense is zero, or the total voltage of the battery pack 8 is lower than a low voltage voltage value, the single chip 1 cuts off the output of the voltage regulator module 2, so that the power battery pack is managed. System 100 enters a low power state. After the charger 4 is connected, the normal output of the voltage regulator module 2 is automatically controlled by the wake-up circuit module 3, and the low power consumption state is automatically woken up; when the total voltage of the battery pack 8 is higher than the low voltage voltage After the load 5 is connected, the normal output of the voltage regulator module 2 is automatically controlled by the wake-up circuit module 3, and the low power consumption state is automatically awakened.

2 is a schematic structural view of a wake-up circuit module and its surrounding circuits in the power battery management system of the embodiment shown in FIG. 1. As shown in FIG. 2, the wake-up circuit module 3 mainly includes: a voltage regulator module switch circuit 201, a charger wake-up module 202, and a load wake-up module 203.

The regulator module switching circuit 201 includes a first PNP transistor Q1, a first NPN transistor Q2, and a first resistor R1. The emitter of the first PNP transistor Q1 is connected to the anode of the battery pack 8. The collector of the first PNP transistor Q1 is connected to the positive terminal of the voltage regulator module 2, and the negative terminal of the voltage regulator module 2 The negative electrode of the battery pack 8 is connected. The base of the first PNP transistor Q1 is connected to the collector of the first NPN transistor Q2 through the first resistor R1, and the emitter of the first NPN transistor Q2 is connected to the cathode of the battery pack 8.

The charger wake-up module 202 includes a second PNP transistor Q3, a second resistor R2, and a third resistor R3. Wherein the base of the second PNP transistor Q3 passes the first The third resistor R3 is connected to the negative end of the charger 4, the positive end of the charger 4 is connected to the positive pole of the battery pack 8, and the emitter of the second PNP transistor Q3 is also connected to the positive pole of the battery pack 8, the second PNP The collector of the transistor Q3 is connected to the base of the first NPN transistor Q2 through the second resistor R2.

The load wake-up module 203 includes a fourth resistor R4, a fifth resistor R5, and a first Zener diode D1. The negative end of the load 5 is connected to the negative end of the first Zener diode D1, and the positive end of the load 5 is connected to the positive pole of the battery pack 8. The positive end of the first Zener diode D1 is connected to the base of the first NPN transistor Q2 through the fifth resistor R5, and the base of the first NPN transistor Q2 is connected to the battery through the fourth resistor R4. The negative pole of 8.

In this embodiment, if the voltage drop across the sampling resistor R _Sense is zero, that is, when the charger 4 or the load 5 is not connected, the single chip 1 will cut off the output of the voltage regulator module 2, and the power battery management system enters low power. Consumption status.

If the battery pack 8 is in the over-discharge state and the load 5 is always connected, the user can set the low-voltage voltage value through the fourth resistor R4 and the fifth resistor R5 and the model of the Zener diode D1. When the total voltage of the battery pack 8 is lower than the low voltage voltage value, the emitter and collector of the first NPN transistor Q2 are not turned on, and the emitter and collector of the first PNP transistor Q1 are not turned on, the single wafer 1 The output of the voltage regulator module 2 is still effectively cut off, and the power battery management system enters a low power state.

When the power battery management system is in a low power consumption state, if the charger 4 is connected, the emitter and collector of the second PNP transistor Q3 are turned on, and the emitter and collector of the first NPN transistor Q2 are turned on, and finally The emitter and collector of a PNP transistor Q1 are turned on, the voltage regulator module 2 will be powered by the battery pack 8, the low power consumption state is automatically awakened, and the power battery pack management system enters a normal working state.

When the power battery management system is in a low power consumption state, if the load 5 is connected, and the total voltage of the battery pack 8 is higher than the low voltage voltage value, the emitter and the collector of the first NPN transistor Q2 are turned on, and finally the first The emitter and collector of the PNP transistor Q1 are turned on, the voltage regulator module 2 will be powered by the battery pack 8, the low power consumption state is automatically awakened, and the power battery pack management system also enters a normal working state.

In the present invention, the wake-up circuit module has several other different implementations. FIG. 3 is a schematic structural diagram of a wake-up circuit module and its surrounding circuits in a power battery management system according to another embodiment of the present invention. The present embodiment has the same reference numerals and the same elements as those of the foregoing embodiments, and the same reference numerals are used to denote the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, and the detailed description is not repeated herein. As shown in FIG. 3, the wake-up circuit module 3 mainly includes: a voltage regulator module switch circuit 201, a charger wake-up module 202, and a load wake-up module 203.

The regulator module switching circuit 201 includes a first PNP transistor Q1, a first NPN transistor Q2, and a first resistor R1. The emitter of the first PNP transistor Q1 is connected to the anode of the battery pack 8. The collector of the first PNP transistor Q1 is connected to the positive terminal of the voltage regulator module 2, and the negative terminal of the voltage regulator module 2 Connected to the negative electrode of the battery pack 8, the base of the first PNP transistor Q1 is connected to the collector of the first NPN transistor Q2 through the first resistor R1, and the emitter of the first NPN transistor Q2 is connected to the battery pack The negative pole of 8.

The charger wake-up module 202 includes a second PNP transistor Q3, a third resistor R3, and a first diode D2. The base of the second PNP transistor Q3 is connected to the negative terminal of the charger 4 through the third resistor R3. The positive terminal of the charger 4 is connected to the positive pole of the battery pack 8, and the second PNP transistor Q3 is The emitter is also connected to the battery pack 8 The anode of the second PNP transistor Q3 is connected to the positive terminal of the first diode D2.

The load wake-up module 203 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first Zener diode D1, and a second diode D3. The negative end of the load 5 is connected to the negative end of the first Zener diode D1, and the positive end of the load 5 is connected to the positive pole of the battery pack 8. The positive end of the first Zener diode D1 passes through the positive end. The fifth resistor R5 is connected to the positive terminal of the second diode D3, the negative terminal of the second diode D3 is connected to the negative terminal of the first diode D2, and the first NPN is connected through the sixth resistor R6. The base of the transistor Q2, the positive terminal of the second diode D3 is connected to the negative electrode of the battery pack 8 through the fourth resistor R4.

FIG. 4 is a schematic structural diagram of a wake-up circuit module and its surrounding circuits in a power battery management system according to still another embodiment of the present invention. The present embodiment has the same reference numerals and the same elements as those of the foregoing embodiments, and the same reference numerals are used to denote the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, and the detailed description is not repeated herein. As shown in FIG. 4, the wake-up circuit module 3 mainly includes: a voltage regulator module switch circuit 201 and a charger wake-up module 202/load wake-up module 203.

The regulator module switching circuit 201 includes a first PNP transistor Q1, a first NPN transistor Q2, and a first resistor R1. The emitter of the first PNP transistor Q1 is connected to the anode of the battery pack 8. The collector of the first PNP transistor Q1 is connected to the positive terminal of the voltage regulator module 2, and the negative terminal of the voltage regulator module 2 Connected to the negative electrode of the battery pack 8, the base of the first PNP transistor Q1 is connected to the collector of the first NPN transistor Q2 through the first resistor R1, and the emitter of the first NPN transistor Q2 is connected to the battery pack The negative pole of 8.

The charger wake-up module 202 or the load wake-up module 203 includes a second NPN transistor Q4, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a first Zener diode D1, and a first A diode D2. The seventh resistor R7 and the eighth resistor R8 are connected in series and connected between the positive electrode and the negative electrode of the battery pack 8. The collector of the second NPN transistor Q4 is connected to the first PNP battery through the first resistor R1. a base of the crystal Q1, a base of the second NPN transistor Q4 is connected between the seventh resistor R7 and the eighth resistor R8, and an emitter of the second NPN transistor Q4 is connected to the first diode D2 The positive end. The fourth resistor R4 is connected between the base of the first NPN transistor Q2 and the cathode of the battery pack 8. The positive terminal of the first Zener diode D1 is connected to the first NPN through the fifth resistor R5. The base of the transistor Q2, the negative terminal of the first Zener diode D1 and the negative terminal of the first diode D2 are commonly connected to the charger 4 or the negative terminal of the load 5, the charger 4 or the The positive terminal of the load 5 is connected to the positive electrode of the battery pack 8.

The working principle of the wake-up circuit module of the embodiment shown in FIG. 3 and FIG. 4 is similar to that of FIG. 2, and those skilled in the art should understand the specific components of the wake-up circuit module in FIG. 3 or FIG. I won't go into details here.

In summary, the present invention improves the scheme of the power battery management system: 1) the problem that the power consumption of the original scheme is always large after the over-discharge state protection is always connected to the load, and the present invention is in this case When the battery pack voltage is lower than the low voltage voltage value (the low voltage voltage value can be freely set by the component parameters in the circuit), the power battery management system will enter a low power state with a maximum power consumption of 1 μA; 2) for the original There is a problem that the switch adopts a switch to wake up the low power state. The invention eliminates the switching device, and the charger can automatically wake up the low power state; if the battery voltage is higher than the low voltage voltage, the load can also automatically wake up the low power. Consumption status.

The circuit component of the invention is small and easy to implement, greatly prolonging the service life of the battery pack, and the charger or the load can automatically wake up the low power consumption state, which is simple and practical.

In summary, the present invention enables the power battery management system to be connected to the load while the battery pack voltage is low, and can also enter a low power consumption state, greatly extending the service life of the battery pack, and eliminating the switching device. The charger or load can automatically wake up the low power state, making the power battery management system simple and practical.

The present invention is disclosed in the above preferred embodiments, but is not intended to limit the invention, and any changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and modifications of the above embodiments may be made without departing from the spirit and scope of the invention.

2‧‧‧voltage regulator

4‧‧‧Charger

5‧‧‧load

8‧‧‧Battery Pack

201‧‧‧Regulator module switching circuit

202‧‧‧Charge wake-up module

203‧‧‧Load wake-up module

D1‧‧‧First Zener diode

Q1‧‧‧First PNP transistor

Q2‧‧‧First NPN transistor

Q3‧‧‧Second PNP transistor

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

R4‧‧‧fourth resistor

R5‧‧‧ fifth resistor

Claims (4)

A power battery management system with a low power consumption automatic wake-up function, connected to a battery pack, comprising: a single chip, a voltage regulator module, a wake-up circuit module, a discharge protection module, a charging protection module, and a sampling resistor Wherein the single wafer controls the entire power battery management system, the power of the single wafer is provided by the voltage regulator module, and the single wafer can cut off according to a voltage drop across the sampling resistor An output of the voltage regulator module; a charger is connected between the positive end of the battery pack and the charging protection module, and a load is connected between the positive end of the battery pack and the discharge protection module. The charging protection module is connected to the negative end of the battery pack through the discharge protection module and the sampling resistor; when the voltage drop across the sampling resistor is zero, or the total voltage of the battery pack is lower than one After the low voltage voltage value, the single chip cuts off the output of the voltage regulator module, and the power battery management system enters a low power consumption state, wherein the wakeup circuit module includes: a voltage regulator module switch circuit, It includes the first a PNP transistor, a first NPN transistor, and a first resistor; wherein an emitter of the first PNP transistor is coupled to a positive electrode of the battery, and a collector of the first PNP transistor is coupled to the Zener a positive end of the group, a negative end of the voltage regulator module is connected to a negative pole of the battery pack, and a base of the first PNP transistor is connected to a collector of the first NPN transistor through the first resistor, An emitter of the first NPN transistor is connected to a cathode of the battery pack; a charger wake-up module includes a second PNP transistor, a second resistor, and a third resistor; wherein, the second PNP transistor a base is connected to a negative end of the charger through the third resistor, and a positive end of the charger is connected to a positive pole of the battery pack, An emitter of the second PNP transistor is also connected to a positive electrode of the battery pack, and a collector of the second PNP transistor is connected to a base of the first NPN transistor through the second resistor; a load wake-up mode a group comprising a fourth resistor, a fifth resistor, and a first Zener diode; wherein a negative end of the load is coupled to a negative terminal of the first Zener diode, and a positive terminal of the load is connected a positive electrode of the battery pack, a positive end of the first Zener diode is connected to a base of the first NPN transistor through the fifth resistor, and a base of the first NPN transistor passes through the first A four resistor is connected to the negative electrode of the battery pack. A power battery management system with a low power consumption automatic wake-up function, connected to a battery pack, comprising: a single chip, a voltage regulator module, a wake-up circuit module, a discharge protection module, a charging protection module, and a sampling resistor Wherein the single wafer controls the entire power battery management system, the power of the single wafer is provided by the voltage regulator module, and the single wafer can cut off according to a voltage drop across the sampling resistor An output of the voltage regulator module; a charger is connected between the positive end of the battery pack and the charging protection module, and a load is connected between the positive end of the battery pack and the discharge protection module. The charging protection module is connected to the negative end of the battery pack through the discharge protection module and the sampling resistor; when the voltage drop across the sampling resistor is zero, or the total voltage of the battery pack is lower than one After the low voltage voltage value, the single chip cuts off the output of the voltage regulator module, and the power battery management system enters a low power consumption state, wherein after the charger is connected, the wakeup circuit module is passed Group automatic control Normal output of said regulator module, a low power state is automatic wakeup; or when the total voltage of the battery voltage is higher than the low value after the load is connected, also by The wake-up circuit module automatically controls the normal output of the voltage regulator module, and the low-power state is automatically woken up, wherein the wake-up circuit module includes: a voltage regulator module switch circuit, which includes a first PNP transistor, a first NPN transistor and a first resistor; wherein an emitter of the first PNP transistor is connected to a positive electrode of the battery, and a collector of the first PNP transistor is connected to a positive terminal of the voltage regulator module a negative terminal of the voltage regulator module is connected to a negative electrode of the battery pack, and a base of the first PNP transistor is connected to a collector of the first NPN transistor through the first resistor, the first An emitter of the NPN transistor is coupled to a negative electrode of the battery; a wake-up module of the charger includes a second PNP transistor, a third resistor, and a first diode; wherein a base of the second PNP transistor Connecting a negative end of the charger through the third resistor, a positive end of the charger is connected to a positive pole of the battery pack, and an emitter of the second PNP transistor is also connected to a positive pole of the battery pack. The collector of the second PNP transistor is connected to the positive end of the first diode; a module including a fourth resistor, a fifth resistor, a sixth resistor, a first Zener diode, and a second diode; wherein a negative end of the load is coupled to the first Zener diode a positive end, the positive end of the load is connected to a positive pole of the battery pack, and a positive end of the first Zener diode is connected to a positive end of the second diode through the fifth resistor, the first a negative terminal of the diode is connected to a negative terminal of the first diode, and a base of the first NPN transistor is connected through the sixth resistor, and a positive terminal of the second diode passes through The fourth resistor is connected to the negative electrode of the battery pack. A power battery management system with a low power consumption automatic wake-up function, connected to a battery pack, comprising: a single chip, a voltage regulator module, a wake-up circuit module, a discharge protection module, a charging protection module, and a sampling resistor ; Wherein the single chip controls the entire power battery management system, the power of the single chip is provided by the voltage regulator module, and the single chip can cut off the voltage according to the voltage drop across the sampling resistor An output of the voltage regulator module; a charger is connected between the positive end of the battery pack and the charging protection module, and a load is connected between the positive end of the battery pack and the discharge protection module, The charging protection module is connected to the negative end of the battery pack through the discharge protection module and the sampling resistor; when the voltage drop across the sampling resistor is zero, or the total voltage of the battery pack is lower than a low voltage After the voltage value, the single chip cuts off the output of the voltage regulator module, and the power battery management system enters a low power consumption state, wherein the wakeup circuit module is passed after the charger is connected Automatically controlling the normal output of the voltage regulator module, the low power consumption state is automatically awakened; or when the total voltage of the battery pack is higher than the low voltage voltage value, and the load is accessed, The circuit module automatically controls the voltage regulator The normal output of the group, the low power consumption state is automatically awakened, wherein the wakeup circuit module comprises: a voltage regulator module switch circuit, comprising a first PNP transistor, a first NPN transistor and a first resistor; wherein The emitter of the first PNP transistor is connected to the anode of the battery pack, the collector of the first PNP transistor is connected to the positive terminal of the voltage regulator module, and the negative terminal of the voltage regulator module is connected to the anode a cathode of the first PNP transistor, wherein a base of the first PNP transistor is connected to a collector of the first NPN transistor, and an emitter of the first NPN transistor is connected to a cathode of the battery a charger wake-up module or a load wake-up module, comprising a second NPN transistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, and a first Zener diode And a first diode; wherein the seventh resistor and the eighth resistor are connected in series and connected between the positive electrode and the negative electrode of the battery pack, and the collector of the second NPN transistor passes through the first a resistor is coupled to the base of the first PNP transistor, a base of the second NPN transistor is coupled between the seventh resistor and the eighth resistor, and an emitter of the second NPN transistor Connecting a positive terminal of the first diode; the fourth resistor is connected between a base of the first NPN transistor and a cathode of the battery, the positive of the first Zener diode The terminal is connected to the base of the first NPN transistor through the fifth resistor, and the negative terminal of the first Zener diode and the negative terminal of the first diode are connected to the charger or the device At the negative end of the load, the charger or the positive terminal of the load is connected to the positive terminal of the battery pack. The power battery management system according to any one of claims 1 to 3, wherein, if the battery pack is in an over-discharge state and the load is always connected, the low-voltage voltage value is The fourth resistance, the fifth resistance, and the type of the first Zener diode are set.