阅读说明：本技术 控制电路、电池管理系统及电化学装置 (Control circuit, battery management system and electrochemical device ) 是由 左明 于 2020-06-24 设计创作，主要内容包括：本申请提供一种控制电路,所述控制电路包括充电唤醒电路、开关模块以及微控制器；所述开关模块用于电连接于电化学装置的电芯单元与电化学装置的外接端口的供电回路中,并用于控制所述供电回路的导通或截止；所述微控制器电连接所述充电唤醒电路,所述微控制器还电连接所述开关模块；所述微控制器和所述充电唤醒电路用于电连接所述电芯单元至所述外接端口；所述充电唤醒电路用于将从所述外接端口输入的信号转换为驱动信号,通过所述驱动信号唤醒所述微控制器,以通过所述微控制器的控制信号控制所述开关模块导通或者截止。本申请还提供一种电池管理系统和电化学装置。本申请提供的所述控制电路结构简单且成本低廉,性能稳定且可靠。(The application provides a control circuit, which comprises a charging wake-up circuit, a switch module and a microcontroller; the switch module is electrically connected to a cell unit of the electrochemical device and a power supply loop of an external port of the electrochemical device, and is used for controlling the on/off of the power supply loop; the microcontroller is electrically connected with the charging wake-up circuit and the switch module; the microcontroller and the charging wake-up circuit are used for electrically connecting the battery cell unit to the external port; the charging wake-up circuit is used for converting a signal input from the external port into a driving signal, and awakening the microcontroller through the driving signal so as to control the switch module to be switched on or switched off through a control signal of the microcontroller. The present application also provides a battery management system and an electrochemical device. The application provides control circuit simple structure and low cost, stable performance and reliable.)

1. A control circuit is applied to an electrochemical device and is characterized by comprising a charging wake-up circuit, a switch module and a microcontroller;

the switch module is electrically connected to a cell unit of the electrochemical device and a power supply loop of an external port of the electrochemical device, and is used for controlling the on/off of the power supply loop;

the microcontroller is electrically connected with the charging wake-up circuit and the switch module; the microcontroller and the charging wake-up circuit are used for electrically connecting the battery cell unit to the external port;

the charge wake-up circuit is used for converting a signal input by an external port into a driving signal, and awakens the microcontroller by the driving signal so as to control the switch module to be switched on or switched off by the control signal of the microcontroller, wherein the charge wake-up circuit comprises a first resistor, a first voltage stabilizing diode, a second voltage stabilizing diode and a photoelectric coupler, one end of the first resistor is used for being electrically connected with the anode of the external port, the other end of the first resistor is electrically connected with the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is electrically connected with the cathode of the second voltage stabilizing diode, and the anode of the second voltage stabilizing diode is electrically connected with the photoelectric coupler.

2. The control circuit according to claim 1, wherein the charge wake-up circuit further includes a second resistor, the second resistor is connected in parallel with the first resistor, one end of the first resistor and one end of the second resistor after being connected in parallel are used for being electrically connected to an anode of the external port, and the other end of the first resistor and the other end of the second resistor after being connected in parallel are electrically connected to a cathode of the first zener diode.

3. The control circuit of claim 2, wherein the charge wake-up circuit further comprises a diode, an anode of the diode is electrically connected to the first resistor and the second resistor after being connected in parallel, and a cathode of the diode is electrically connected to a cathode of the first zener diode.

4. The control circuit according to claim 1, wherein the charge wake-up circuit further includes a third resistor, a first end of the photo coupler is electrically connected to an anode of the second zener diode, a second end of the photo coupler is electrically connected to a cathode of the external port, a third end of the photo coupler is grounded, a fourth end of the photo coupler is electrically connected to the microcontroller, and the fourth end of the photo coupler is further electrically connected to the power supply of the control circuit through the third resistor.

5. The control circuit of claim 1, wherein the switch module includes a first electronic switch and a second electronic switch, a first terminal of the first electronic switch is electrically connected to a charging pin of the microcontroller, a second terminal of the first electronic switch is electrically connected to a negative electrode of the external port, a third terminal of the first electronic switch is electrically connected to a third terminal of the second electronic switch, a first terminal of the second electronic switch is electrically connected to a discharging pin of the microcontroller, a second terminal of the second electronic switch is electrically connected to a negative electrode of the cell unit, and a third terminal of the second electronic switch is electrically connected to the third terminal of the first electronic switch.

6. The control circuit of claim 5, wherein the switch module further comprises a third electronic switch and a fourth resistor, a first terminal of the third electronic switch is electrically connected to a pre-discharge pin of the microcontroller, a second terminal of the third electronic switch is electrically connected to the negative electrode of the cell unit, and a third terminal of the third electronic switch is electrically connected between the first electronic switch and the second electronic switch through the fourth resistor.

7. The control circuit of claim 6, further comprising a fifth resistor, configured to detect a charging current of the control circuit, wherein one end of the fifth resistor is electrically connected to the negative electrode of the cell unit, and the other end of the fifth resistor is electrically connected to the second ends of the first electronic switch and the third electronic switch.

8. A battery management system, characterized in that it comprises a control circuit according to any one of claims 1 to 7.

9. The battery management system of claim 8, wherein the control circuit further comprises an acquisition module configured to be electrically connected between the cell unit and the microcontroller for acquiring parameters of the cell unit.

10. An electrochemical device comprising a cell unit, characterized in that the electrochemical device further comprises a control circuit according to any one of claims 1 to 7 for controlling charging and discharging of the cell unit.

Technical Field

The present disclosure relates to the field of battery technologies, and more particularly, to a control circuit, and a battery management system and an electrochemical device having the control circuit.

Background

With the continuous enhancement of environmental protection consciousness of people, the electric vehicle is taken as a short-distance travel tool and is integrated into the daily life of people. Electric vehicles rely on rechargeable batteries (e.g., lithium ion batteries) to provide their energy. In order to safely use the electric vehicle with the battery, a battery management system is added. When the electric power of the battery in the electric vehicle is exhausted, the battery needs to be charged. In the process of charging the battery, the battery management system needs to be awakened when the charger is connected with the battery so as to perform charging management. And after the charging process is finished, the battery management system needs to be triggered to enter a sleep state so as to avoid the loss of electric quantity in the battery or secondary overcharge of the battery.

In the prior art, in order to ensure that a battery management system manages the battery charging in real time, the battery management system is usually not in a sleep state. Therefore, the problems of large power consumption, low application range and the like of the battery management system can be caused.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a control circuit, and a battery management system and an electrochemical device having the same. The battery management system can be timely enabled to enter a dormant state, a circuit is saved, and the battery management system can be timely awakened to conduct charging and discharging management on the battery cell unit.

One embodiment of the present application provides a control circuit applied to an electrochemical device, the control circuit including a charge wake-up circuit, a switch module and a microcontroller;

the switch module is electrically connected to a cell unit of the electrochemical device and a power supply loop of an external port of the electrochemical device, and is used for controlling the on/off of the power supply loop;

the microcontroller is electrically connected with the charging wake-up circuit and the switch module; the microcontroller and the charging wake-up circuit are used for electrically connecting the battery cell unit to the external port;

the charge wake-up circuit is used for converting a signal input by an external port into a driving signal, and awakens the microcontroller by the driving signal so as to control the switch module to be switched on or switched off by the control signal of the microcontroller, wherein the charge wake-up circuit comprises a first resistor, a first voltage stabilizing diode, a second voltage stabilizing diode and a photoelectric coupler, one end of the first resistor is used for being electrically connected with the anode of the external port, the other end of the first resistor is electrically connected with the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is electrically connected with the cathode of the second voltage stabilizing diode, and the anode of the second voltage stabilizing diode is electrically connected with the photoelectric coupler.

According to some embodiments of the present application, the wake-up circuit that charges further includes a second resistor, the second resistor with the first resistor is parallelly connected, after parallelly connected the first resistor with the one end of second resistor be used for with the anodal electricity of external port is connected, after parallelly connected the first resistor with the other end of second resistor with the negative pole electricity of first zener diode is connected.

According to some embodiments of the application, the charge wake-up circuit further comprises a diode, an anode of the diode is electrically connected with the first resistor and the second resistor after being connected in parallel, and a cathode of the diode is electrically connected with a cathode of the first voltage regulator diode.

According to some embodiments of the present application, the wake-up circuit that charges still includes the third resistance, photoelectric coupler's first end with second zener diode's positive pole electricity is connected, photoelectric coupler's second end be used for with the negative pole electricity of external port is connected, photoelectric coupler's third end ground connection, photoelectric coupler's fourth end with microcontroller electricity is connected, photoelectric coupler's fourth end still passes through the third resistance with control circuit's power electricity is connected.

According to some embodiments of the present application, the switch module includes a first electronic switch and a second electronic switch, a first end of the first electronic switch is electrically connected to a charging pin of the microcontroller, a second end of the first electronic switch is electrically connected to a negative electrode of the external port, a third end of the first electronic switch is electrically connected to a third end of the second electronic switch, a first end of the second electronic switch is electrically connected to a discharging pin of the microcontroller, a second end of the second electronic switch is electrically connected to a negative electrode of the battery cell, and a third end of the second electronic switch is electrically connected to the third end of the first electronic switch.

According to some embodiments of the present application, the switch module further includes a third electronic switch and a fourth resistor, a first end of the third electronic switch is electrically connected to the pre-discharge pin of the microcontroller, a second end of the third electronic switch is used for electrically connecting to the negative electrode of the battery cell unit, and a third end of the third electronic switch is electrically connected between the first electronic switch and the second electronic switch through the fourth resistor.

According to some embodiments of the present application, the control circuit further includes a fifth resistor, configured to detect a charging current of the control circuit, where one end of the fifth resistor is electrically connected to the negative electrode of the battery cell unit, and the other end of the fifth resistor is electrically connected to the second ends of the first electronic switch and the third electronic switch.

An embodiment of the present application provides a battery management system including the control circuit as described above.

According to some embodiments of the present application, the control circuit further includes an acquisition module, and the acquisition module is electrically connected between the electric core unit and the microcontroller, and is configured to acquire parameters of the electric core unit.

An embodiment of the present application provides an electrochemical device, which includes a cell unit, and the control circuit as described above, configured to control charging and discharging of the cell unit.

The control circuit that this application embodiment provided and have control circuit's battery management system and electrochemical device, through the awakening circuit that charges among the control circuit will be from the signal conversion of external port input to drive signal, through microcontroller is awaken up to drive signal, with through microcontroller's control signal control switch module switches on or cuts off. Therefore, when the charger is connected with the battery cell unit, the battery management system is awakened to carry out charging management, and the battery management system enters a dormant state after charging is finished, so that the electric quantity loss or secondary overcharge of the battery pack is avoided. The control circuit and the battery management system provided by the embodiment of the application have the advantages of simple circuit, low cost, stable performance and reliability.

Drawings

Fig. 1 is a block diagram of an electrochemical device according to a first preferred embodiment of the present application.

Fig. 2 is a block diagram of an electrochemical device according to a second preferred embodiment of the present application.

Fig. 3 is a circuit diagram of a first embodiment of a control circuit in the battery management system of fig. 1.

Fig. 4 is a circuit diagram of a second embodiment of a control circuit in the battery management system of fig. 1.

Description of the main elements

Control circuit 100

Battery management system 200

Battery cell unit 300

External connection port 400

Charger 500

Electrochemical device 600

Charging wake-up circuit 10

Switch module 11

Microcontroller 12

Acquisition module 13

Power supply 14

Predischarge switch module 15

First resistor R1

Second resistor R2

Third resistor R3

Fourth resistor R4

Fifth resistor R5

Diode D1

First zener diode ZD1

Second zener diode ZD2

First electronic switch K1

Second electronic switch K2

Third electronic switch K3

Photoelectric coupler U1

Switch unit 16

Light emitting unit 17

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening components, either internally or in cooperative relationship to each other. The above terms have the specific meanings given in the present application immediately as the case may be, for a person of ordinary skill in the art.

The terms "first," "second," and "third," etc. in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions.

Referring to fig. 1, fig. 1 is a block diagram of an electrochemical device according to a preferred embodiment of the present invention. The electrochemical device 600 includes a cell unit 300 and a control circuit 100 electrically connected to the cell unit 300. The control circuit 100 is located in the battery management system 200, and is configured to control the battery management system 200 to perform charging and discharging management on the battery cell unit 300. The control circuit 100 is configured to be electrically connected between the battery cell unit 300 and the external port 400 to form a power supply loop, and the control circuit 100 is configured to control the power supply loop to be turned on or off, so as to control the battery management system 200 to perform charging and discharging management on the battery cell unit 300.

The control circuit 100 includes a charge wake-up circuit 10, a switch module 11, and a microcontroller 12.

Specifically, in the embodiment of the present application, the switch module 11 is located in a power supply loop between the negative electrode of the battery cell unit 300 and the external port 400, and the microcontroller 12 is configured to be electrically connected between the battery cell unit 300 and the charging wake-up circuit 10. The charge wake-up circuit 10 is connected between the microcontroller 12 and the external port 400. The microcontroller 12 is also electrically connected to the switch module 11. The charging wake-up circuit 10 is configured to convert a signal input from the external port 400 into a driving signal, wake up the microcontroller 12 through the driving signal, and drive the switch module 11 to be turned on or turned off through a control signal of the microcontroller 12.

In one embodiment, the control circuit 100 further includes an acquisition module 13, as shown in fig. 2. The collection module 13 is configured to be electrically connected between the battery cell unit 300 and the microcontroller 12. The acquisition module 13 is configured to sample parameters (such as voltage, current, and the like) of the battery cell unit 300.

In one embodiment, the control circuit 100 further comprises a power source 14, and the microcontroller 12 is connected to the positive electrode of the external port 400 through the power source 14. The power supply 14 is used to provide power to the microcontroller 12.

In one embodiment, the positive electrode of the external port 400 may be electrically connected to the positive electrode of a charger 500, and the negative electrode of the external port 400 may be electrically connected to the negative electrode of the charger 500.

Referring to fig. 3, fig. 3 is a circuit diagram of a control circuit 100 according to a first embodiment of the present disclosure.

In this embodiment, the charge wake-up circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a first zener diode ZD1, a second zener diode ZD2, and a photo-coupler U1.

The first resistor R1 is connected in parallel with the second resistor R2, and is connected in series in the charge wake-up circuit 10 as a current-limiting resistor. One end of the first resistor R1 and one end of the second resistor R2 which are connected in parallel are electrically connected with the positive electrode of the external port 400, the other end of the first resistor R1 and the other end of the second resistor R2 which are connected in parallel are connected with the cathode of the first zener diode ZD1, the anode of the first zener diode ZD1 is connected with the cathode of the second zener diode ZD2, and the anode of the second zener diode ZD2 is connected with the photocoupler U1.

In an embodiment, the charge wake-up circuit 10 further includes a diode D1, an anode of the diode D1 is connected to the first resistor R1 and the second resistor R2 after being connected in parallel, and a cathode of the diode D1 is connected to a cathode of the first zener diode ZD 1.

In this embodiment, the diode D1 is used to block a reverse voltage, and the first zener diode ZD1 and the second zener diode ZD2 accept a main voltage drop of the charge wake-up circuit 10. The highest terminal voltage of the positive electrode of the external port 400 is equal to the charger voltage, and the lowest terminal voltage of the negative electrode of the external port 400 is equal to the terminal voltage of the negative electrode of the battery cell unit 300. At this time, the maximum voltage across the charge wake-up circuit 10 is equal to the voltage of the battery cell unit 300. When the load is an inductive load, the highest terminal voltage of the negative electrode of the external port 400 is twice as high as the terminal voltage of the positive electrode of the external port 400 when the switch module 11 is turned off. At this time, the voltage across the charge wake-up circuit 10 is the maximum voltage of the cell unit 300 in the opposite direction, and the diode D1 can prevent the reverse voltage from flowing backwards to damage the components

In this embodiment, a first terminal of the photocoupler U1 is connected to an anode of the second zener diode ZD2, a second terminal of the photocoupler U1 is connected to a cathode of the external connection port 400, a third terminal of the photocoupler is grounded, and a fourth terminal of the photocoupler is connected to the microcontroller 12. The fourth terminal of the photocoupler U1 is also connected to a power supply 14 through the third resistor R3, and the power supply 14 is used for supplying power to the microcontroller 12. Specifically, the photo coupler U1 includes a switching unit 16 and a light emitting unit 17. The switching unit 16 may be a photo transistor, and the light emitting unit 17 may be a light emitting diode. One end of the light emitting unit 17 is connected to the anode of the second zener diode ZD2, and the other end of the light emitting unit 17 is connected to the cathode of the external connection port 400. A first end of the switch unit 16 is configured to receive light emitted by the light emitting unit 17, a second end of the switch unit 16 is grounded, and a third end of the switch unit 16 is connected to the microcontroller 12. The third terminal of the switching unit 16 is also connected to the power supply 14 through the third resistor R3. The first end, the second end and the third end of the switch unit 16 correspond to the base electrode, the emitter electrode and the collector electrode of the phototriode respectively. A first end of the photocoupler U1 is one end of the light emitting unit 17, a second end of the photocoupler U1 is the other end of the light emitting unit 17, a third end of the photocoupler U1 is a second end of the switching unit 16, and a fourth end of the photocoupler U1 is a third end of the switching unit 16.

In this embodiment, the photocoupler U1 is configured to convert an input signal received by the charger 500 into a driving signal recognizable to a 3.3V system, and wake up the microcontroller 12 through the driving signal, so as to control the switch module 11 to be turned on through a control signal of the microcontroller 12, thereby completing the whole charging activation process. In one embodiment, the optocoupler U1 may be a conventional low speed optocoupler, such as LTV-217, with a forward conduction voltage of 1.2V.

In this embodiment, the magnitudes of the resistances of the first resistor R1 and the second resistor R2 determine the operating current of the charge wake-up circuit 10. The working current is equal to the value obtained by subtracting the voltage of the first zener diode ZD1 and the voltage of the second zener diode ZD2 from the charger output voltage and subtracting the on-state voltage of the photocoupler U1 and then dividing the value by the resistance value obtained by connecting the first resistor R1 and the second resistor R2 in parallel.

In one embodiment, a cell unit 300 with an operating voltage of 72V is taken as an example. The parallel resistor formed by the first resistor R1 and the second resistor R2 is mainly used for limiting the working current, and the first zener diode ZD1, the second zener diode ZD2 and the photocoupler U1 can be normally driven. The diode D1 is BAV21, the reverse withstand voltage is 250V, the forward breakover voltage is 0.7V, and the requirement of twice the voltage of the battery cell unit 300 is met. The first zener diode ZD1 and the second zener diode ZD2 share the main voltage of the control circuit, and a zener diode with a rated zener voltage of 33V (such as MMSZ5257BT1G) can be selected, and its regulated operating current is 0.25-3 mA. The photocoupler U1 can be LTV-217, the forward conduction voltage of the photocoupler U1 is 1.2V, the working current is 1mA-50mA, and the photocoupler U1 is not conducted when the current is less than 1 mA. Thus, the microcontroller 12 is not woken up. The resistance values of the first resistor R1 and the second resistor R2 are both 15K, so that the wake-up voltage of the control circuit 100 can be calculated to be 81.2V.

In the present embodiment, the switch module 11 includes a first electronic switch K1 and a second electronic switch K2. A first end of the first electronic switch K1 is connected to a discharge pin DSG of the microcontroller 12, a second end of the first electronic switch K1 is used for connecting the negative electrode of the battery cell unit 300, and a third end of the first electronic switch K1 is connected to a third end of the second electronic switch K2. A first terminal of the second electronic switch K2 is connected to the charging pin CHG of the microcontroller 12, a second terminal of the second electronic switch K2 is connected to the negative electrode of the external port 400, and a third terminal of the second electronic switch K2 is connected to the third terminal of the first electronic switch K2.

In this embodiment, the first electronic switch K1 and the second electronic switch K2 are both N-type field effect transistors. The first terminal, the second terminal and the third terminal of the first electronic switch K1 and the second electronic switch K2 respectively correspond to the gate, the source and the drain of the N-type fet.

Referring to fig. 4, fig. 4 is a circuit diagram of a control circuit 100 according to a second embodiment of the present invention.

The control circuit 100 of the present embodiment differs from the control circuit 100 of the first embodiment in that:

in the present embodiment, the switch module 11 further includes a pre-discharge switch module 15, and the pre-discharge switch module 15 includes a third electronic switch K3 and a fourth resistor R4.

One end of the third electronic switch K3 is used for being connected with the negative electrode of the battery cell unit 300, and the other end of the third electronic switch K3 is connected between the first switch K1 and the second switch K2 through the fourth resistor R4.

A first end of the third electronic switch K3 is connected to the PDSG pin of the microcontroller 12, a second end of the third electronic switch K3 is used for being connected to the negative electrode of the battery cell unit 300, and a third end of the third electronic switch K3 is connected between the first electronic switch K1 and the second electronic switch K2 through the fourth resistor R4.

In this embodiment, the third electronic switch K3 is an N-type field effect transistor. The first end, the second end and the third end of the third electronic switch K3 correspond to the gate, the source and the drain of the N-type fet, respectively.

In one embodiment, the control circuit 100 further includes a fifth resistor R5, and the fifth resistor R5 is a sampling resistor for detecting the charging current of the control circuit 100. One end of the fifth resistor R5 is used to be electrically connected to the negative electrode of the battery cell unit 300, and the other end of the fifth resistor R5 is electrically connected to the second ends of the first electronic switch K1 and the third electronic switch K3.

It should be noted that the control circuit 100 according to the first embodiment of the present application may also include the fifth resistor R5 (as shown in fig. 3), where the fifth resistor R5 is a sampling resistor for detecting the charging current of the control circuit 100. One end of the fifth resistor R5 is used to be electrically connected to the negative electrode of the battery cell unit 300, and the other end of the fifth resistor R5 is electrically connected to the second end of the first electronic switch K1.

In one embodiment, a circuit diagram of a first embodiment of the control circuit 100 of the present application is taken as an example to explain:

in use, the control circuit 100 does not include the pre-discharge switch circuit, and the battery cell unit 300 is in a standby state, i.e., a non-charging state. In order to avoid the power loss, the battery cell unit 300 enters a sleep state, the first electronic switch K1 and the second electronic switch K2 are both in a cut-off state, and the battery management system 200 is in the sleep state. An input signal is generated when a charger is accessed through the external port 400. And the output voltage of the charger is 83V, which can trigger the photoelectric coupler U1 to be conducted. The input signal passes through a first resistor R1, a second resistor R2, a diode D1, a first voltage stabilizing diode ZD1 and a second voltage stabilizing diode ZD2 which are connected in parallel, the input signal is converted into a driving signal through a conducted photoelectric coupler U1, and the driving signal is used for interrupting and triggering a microcontroller connected with the photoelectric coupler U1 to wake up the battery management system, so that the second electronic switch K2 is conducted to form a power supply loop and charge the battery cell unit 300.

In another embodiment, a circuit diagram of a second embodiment of the control circuit 100 of the present application is taken as an example to explain:

the pre-discharge switch module 15 is required to maintain a constant power output since it is required to continuously supply power to a load (e.g., a meter, a lamp, etc.) of the control circuit 100 through pre-discharge. Namely, when the first electronic switch K1 and the second electronic switch K2 are in the off state, the third electronic switch K3 is in the on state. When the external port 400 is connected to a charger to wake up the battery management system, the second electronic switch K2 is in a conducting state. Due to the diode inside the second electronic switch K2, the discharge direction is conductive. Therefore, a constant electric output voltage can be obtained at the cell unit 300. When the first electronic switch K1 is also in the on state, the output voltage can still be obtained by the battery cell unit 300 due to the existence of the pre-discharge switch module 15.

When the output voltage of the battery cell unit 300 is in the range of 81.2V to 83V, the control circuit 100 can be activated by both the battery cell unit 300 and the connected charger, and it cannot be determined whether the driving signal is from the battery cell unit 300 or the charger. Therefore, the battery management system 200 does not enter the sleep state, and it is necessary to determine whether the battery cell unit 300 is being charged by detecting the current of the power supply loop.

When the voltage of the cell unit 300 is less than 81.2V, the cell unit 300 cannot enable the control circuit 100, the cell unit 300 may enter a low power consumption sleep state, and the battery management system 200 also enters a sleep state; when a charger is connected through the external port 400, the control circuit 100 is enabled, and the microcontroller 12 is triggered to wake up the battery management system 200, so that the battery cell unit 300 enters a normal charging state.

In the control circuit 100 and the battery management system 200 having the control circuit 100 provided in the above embodiment, the charging wake-up circuit 10 converts a signal input from the external port 400 into a driving signal, and wakes up the microcontroller 12 by the driving signal, so as to control the switching module 11 to be turned on or off by the control signal of the microcontroller 12. Thus, the control circuit 100 and the battery management system 200 provided in the embodiment of the present application can wake up the battery management system 200 for charge management when the charger 500 is connected to the electric core unit 300, and enable the battery management system 200 to enter a sleep state after charging is completed, so as to avoid power loss or secondary overcharge of the battery pack, and the control circuit 100 has the characteristics of simple circuit, low cost, stable performance and reliability.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that suitable modifications and changes of the above embodiments are within the scope of the claims of the present application as long as they are within the spirit and scope of the present application.