WO2021258367A1

WO2021258367A1 - Control circuit, battery management system, and electrochemical device

Info

Publication number: WO2021258367A1
Application number: PCT/CN2020/098241
Authority: WO
Inventors: 左明
Original assignee: 东莞新能安科技有限公司
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-12-30
Also published as: CN113544007A

Abstract

The present application provides a control circuit. The control circuit comprises a charging wakeup circuit, a switch module, and a microcontroller. The switch module is used for a power supply circuit between a battery cell unit electrically connected to an electrochemical device and an external port of the electrochemical device, and used for controlling turning on or turning off of the power supply circuit. The microcontroller is electrically connected to the charging wakeup circuit, and the microcontroller is further electrically connected to the switch module; the microcontroller and the charging wakeup circuit are used for electrically connecting the battery cell unit to the external port. The charging wakeup circuit is used for converting a signal inputted from the external port into a driving signal, and waking up the microcontroller by means of the driving signal, so as to control, by means of the control signal of the microcontroller, the switch module to be turned on or turned off. The present application further provides a battery management system, and the electrochemical device. The control circuit provided in the present application is simple in structure and low in costs, stable and reliable in performance.

Description

Control circuit, battery management system and electrochemical device

Technical field

This application relates to the field of battery technology, and in particular to a control circuit, a battery management system and an electrochemical device having the control circuit.

Background technique

As people's awareness of environmental protection continues to increase, electric vehicles, as short-distance transportation tools, have been integrated into our daily lives. Electric vehicles rely on rechargeable batteries (for example, lithium-ion batteries) to provide energy for them. In order to safely use the electric vehicle with the battery, we have added a battery management system. When the power of the battery in the electric vehicle is used up, 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 to the battery to perform charging management. In addition, after the charging process is completed, the battery management system needs to be triggered to enter the sleep state to avoid loss of power in the battery or overcharging the battery a second time.

In the prior art, in order to ensure that the battery management system manages the battery charging in real time, the battery management system usually does not enter a sleep state. As a result, the battery management system consumes a lot of power and has a limited range of applications.

Summary of the invention

In view of the foregoing, it is necessary to provide a control circuit, a battery management system and an electrochemical device having the control circuit. The battery management system can be put into a dormant state in time to save circuits, and the battery management system can also be awakened in time to manage the charge and discharge of the battery cell unit.

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

The switch module is used to electrically connect the cell unit of the electrochemical device and the power supply circuit of the external port of the electrochemical device, and is used to control the on or off of the power supply circuit;

The microcontroller is electrically connected to the charging wake-up circuit, and the microcontroller is also electrically connected to the switch module; the microcontroller and the charging wake-up circuit are used to electrically connect the battery cell unit to the external port;

The charging wake-up circuit is used to convert the signal input from the external port into a drive signal, wake up the microcontroller by the drive signal, and control the switch module to be turned on by the control signal of the microcontroller Or cut off, wherein the charging and wake-up circuit includes a first resistor, a first zener diode, a second zener diode, and a photocoupler, and one end of the first resistor is used to electrically connect to the anode of the external port, The other end of the first resistor is electrically connected to the cathode of the first Zener diode, the anode of the first Zener diode is electrically connected to the cathode of the second Zener diode, and the second Zener diode The anode is electrically connected to the photocoupler

According to some embodiments of the present application, the charging wake-up circuit further includes a second resistor, the second resistor is connected in parallel with the first resistor, and one end of the first resistor and the second resistor in parallel is used for It is electrically connected to the anode of the external port, and the other ends of the first resistor and the second resistor connected in parallel are electrically connected to the cathode of the first Zener diode.

According to some embodiments of the present application, the charging wake-up circuit further includes a diode, the anode of the diode is electrically connected to the first resistor and the second resistor connected in parallel, and the cathode of the diode is electrically connected to the first resistor. The cathode of the Zener diode is electrically connected.

According to some embodiments of the present application, the charging wake-up circuit further includes a third resistor, the first end of the photocoupler is electrically connected to the anode of the second Zener diode, and the second end of the photocoupler is electrically connected to the anode of the second Zener diode. For electrical connection with the negative electrode of the external port, the third end of the photocoupler is grounded, the fourth end of the photocoupler is electrically connected to the microcontroller, and the fourth end of the photocoupler It is also electrically connected to the power supply of the control circuit through the third resistor.

According to some embodiments of the present application, the switch module includes a first electronic switch and a second electronic switch, the first end of the first electronic switch is electrically connected to the charging pin of the microcontroller, and the first electronic switch The second end of the switch is used to electrically connect the negative electrode of the external port, the third end of the first electronic switch is electrically connected to the third end of the second electronic switch, and the first end of the second electronic switch is electrically connected to the Connect the discharge pin of the microcontroller, the second end of the second electronic switch is used to electrically connect the negative electrode of the cell unit, and the third end of the second electronic switch is electrically connected to the first electronic The third end of the switch.

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

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

An embodiment of the present application provides a battery management system, which includes the control circuit described above.

According to some embodiments of the present application, the control circuit further includes a collection module, which is configured to be electrically connected between the battery cell unit and the microcontroller, and is used to collect the parameters of the battery cell unit.

An embodiment of the present application provides an electrochemical device, the electrochemical device includes a cell unit, and the control circuit as described above, and the control circuit is used to control the charge and discharge of the cell unit.

In the control circuit provided by the embodiment of the present application, the battery management system and the electrochemical device having the control circuit, the signal input from the external port is converted into a drive signal through the charge wake-up circuit in the control circuit, and the drive signal The microcontroller is awakened to control the switch module to be turned on or off through the control signal of the microcontroller. Therefore, when the charger is connected to the battery cell unit, the battery management system is awakened for charging management, and the battery management system enters a sleep state after the charging is completed, so as to avoid power loss or secondary overcharging of the battery pack. The control circuit and the battery management system provided by the embodiments of the present application have simple circuits, low cost, and stable and reliable performance.

Description of the 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 in Fig. 1.

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

Symbol description of main components

Control circuit 100

Battery management system 200

Cell unit 300

External port 400

Charger 500

Electrochemical device 600

Charging wake-up circuit 10

Switch module 11

Microcontroller 12

Collection module 13

Power supply 14

Pre-discharge switch module 15

First resistor R1

Second resistance R2

The third resistance R3

Fourth resistor R4

Fifth resistor R5

Diode D1

The first Zener diode ZD1

Second Zener Diode ZD2

The first electronic switch K1

The second electronic switch K2

The third electronic switch K3

Optocoupler U1

Switch unit 16

Light-emitting unit 17

The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of the present invention, not all the embodiments.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. ; It can be a mechanical connection, an electrical connection or a mutual communication; it can be a direct connection or an indirect connection through an intermediate connection, and it can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be immediately based on specific circumstances.

The terms "first", "second" and "third" in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific sequence. In addition, the term "including" and any variations of them are intended to cover non-exclusive inclusion.

Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

Please refer to FIG. 1. FIG. 1 is a block diagram of a preferred embodiment of an electrochemical device according to the present application. 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 used to control the battery management system 200 to perform charge and discharge management of the battery cell unit 300. The control circuit 100 is used for electrically connecting between the battery cell unit 300 and the external port 400 to form a power supply loop, and the control circuit 100 is used for controlling the power supply loop to be turned on or off, thereby controlling the battery management The system 200 performs charge and discharge management on the battery cell unit 300.

The control circuit 100 includes a charging 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 the power supply circuit between the negative electrode of the battery cell unit 300 and the external port 400, and the microcontroller 12 is used to electrically connect the battery cell unit 300 and the power supply circuit. Between the charging and awakening circuit 10. The charging 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 used to convert a signal input from the external port 400 into a drive signal, wake up the microcontroller 12 through the drive signal, and drive the microcontroller 12 through the control signal of the microcontroller 12 The switch module 11 is turned on or off.

In an embodiment, the control circuit 100 further includes an acquisition module 13, as shown in FIG. 2. The acquisition module 13 is used to electrically connect between the battery cell unit 300 and the microcontroller 12. The acquisition module 13 is used to sample the parameters (such as voltage, current, etc.) of the battery cell unit 300.

In one embodiment, the control circuit 100 further includes a power supply 14, and the microcontroller 12 is connected to the positive terminal of the external port 400 through the power supply 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 can be electrically connected to the positive electrode of a charger 500, and the negative electrode of the external port 400 can be electrically connected to the negative electrode of the charger 500.

Please refer to FIG. 3, which is a circuit diagram of the first embodiment of the control circuit 100 according to the present application.

In this embodiment, the charging 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 photocoupler U1.

The first resistor R1 and the second resistor R2 are connected in parallel, and are connected in series in the charging and wake-up circuit 10 as a current limiting resistor. One end of the first resistor R1 and the second resistor R2 in parallel is electrically connected to the positive electrode of the external port 400, and the other end of the first resistor R1 and the second resistor R2 in parallel is Is connected to the cathode of the first Zener diode ZD 1, the anode of the first Zener diode ZD1 is connected to the cathode of the second Zener diode ZD2, and the anode of the second Zener diode ZD2 is connected to the The photocoupler U1 is connected.

In one embodiment, the charging wake-up circuit 10 further includes a diode D1, the anode of the diode D1 is connected to the first resistor R1 and the second resistor R2 connected in parallel, and the cathode of the diode D1 is connected to the first resistor R1 and the second resistor R2. The cathode of the first Zener diode ZD1 is connected.

In this embodiment, the diode D1 is used to prevent reverse voltage, and the first zener diode ZD1 and the second zener diode ZD2 bear the main voltage drop of the charging and wake-up circuit 10. The terminal voltage of the positive electrode of the external port 400 is at most equal to the charger voltage, and the terminal voltage of the negative electrode of the external port 400 is at least equal to the terminal voltage of the negative electrode of the cell unit 300. At this time, the maximum value of the voltage across the charging wake circuit 10 is equal to the voltage of the battery cell 300. When the load is an inductive load, the terminal voltage of the negative pole of the external port 400 is at most twice the terminal voltage of the positive pole of the external port 400 when the switch module 11 is turned off. At this time, the voltage at both ends of the charging and wake-up circuit 10 is the maximum voltage of the reversed cell unit 300, and the diode D1 can prevent the reverse voltage from damaging the components.

In this embodiment, the first end of the photocoupler U1 is connected to the anode of the second Zener diode ZD2, and the second end of the photocoupler U1 is connected to the cathode of the external port 400, so The third end of the photocoupler is grounded, and the fourth end of the photocoupler is connected to the microcontroller 12. The fourth terminal of the photocoupler U1 is also connected to a power source 14 through the third resistor R3, and the power source 14 is used to provide power to the microcontroller 12. Specifically, the photocoupler U1 includes a switch unit 16 and a light-emitting unit 17. The switch unit 16 may be a photosensitive triode, 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 port 400. The first end of the switch unit 16 is used to receive the light emitted by the light emitting unit 17, the second end of the switch unit 16 is grounded, and the third end of the switch unit 16 is connected to the microcontroller 12. The third terminal of the switch unit 16 is also connected to the power source 14 through the third resistor R3. The first end, the second end and the third end of the switch unit 16 respectively correspond to the base, emitter and collector of the photosensitive transistor. The first end of the photocoupler U1 is one end of the light emitting unit 17, the second end of the photocoupler U1 is the other end of the light emitting unit 17, and the third end of the photocoupler U1 is The second terminal of the switch unit 16 and the fourth terminal of the photocoupler U1 are the third terminal of the switch unit 16.

In this embodiment, the photocoupler U1 is used to convert the input signal after the charger 500 is connected to a drive signal that can be recognized by the 3.3V system, and the microcontroller 12 is awakened by the drive signal to The switch module 11 is controlled to be turned on by the control signal of the microcontroller 12 to complete the entire charging activation process. In an embodiment, the photocoupler U1 may be a general low-speed photocoupler, such as LTV-217, with a forward conduction voltage of 1.2V.

In this embodiment, the resistance values of the first resistor R1 and the second resistor R2 determine the operating current of the charging wake-up circuit 10. The magnitude of the working current is equal to the charger output voltage minus the voltage of the first zener diode ZD1 and the voltage of the second zener diode ZD2, and the on-voltage of the photocoupler U1 is subtracted and divided by The resistance value of the first resistor R1 and the second resistor R2 in parallel.

In one embodiment, the cell unit 300 with a working voltage of 72V is taken as an example. The parallel resistance formed by the first resistor R1 and the second resistor R2 is mainly used to limit the operating current, and to ensure that the first Zener diode ZD1, the second Zener diode ZD2, and the photocoupler U1 can Drive normally. The diode D1 is BAV21, the reverse withstand voltage is 250V, and the forward conduction voltage is 0.7V, which meets the voltage requirement of twice the cell unit 300. 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 -3mA. The photocoupler U1 may be LTV-217, the forward voltage is 1.2V, and the working current is 1mA-50mA. When the current is less than 1mA, the photocoupler U1 does not conduct. Therefore, the microcontroller 12 will not be awakened. The resistance values of the first resistor R1 and the second resistor R2 are both 15K. Therefore, the wake-up voltage of the control circuit 100 can be calculated to be 81.2V.

In this embodiment, the switch module 11 includes a first electronic switch K1 and a second electronic switch K2. The first end of the first electronic switch K1 is connected to the discharge pin DSG of the microcontroller 12, and the second end of the first electronic switch K1 is used to connect the negative electrode of the battery cell unit 300. The third terminal of an electronic switch K1 is connected to the third terminal of the second electronic switch K2. The first end of the second electronic switch K2 is connected to the charging pin CHG of the microcontroller 12, the second end of the second electronic switch K2 is used to connect to the negative electrode of the external port 400, and the second The third terminal of the 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 end, the second end, and the third end of the first electronic switch K1 and the second electronic switch K2 correspond to the gate, source, and drain of the N-type field effect transistor, respectively.

Please refer to FIG. 4, which is a circuit diagram of a second embodiment of the control circuit 100 of the present application.

The difference between the control circuit 100 of this embodiment and the control circuit 100 of the first embodiment is:

In this 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 to connect to the negative electrode of the cell unit 300, and the other end of the third electronic switch K3 is connected to the first switch K1 and the first switch K1 through the fourth resistor R4. Between the second switch K2.

The first end of the third electronic switch K3 is connected to the pre-discharge pin PDSG of the microcontroller 12, and the second end of the third electronic switch K3 is used to connect to the negative electrode of the cell unit 300, so The third terminal 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 terminal, the second terminal, and the third terminal of the third electronic switch K3 correspond to the gate, source, and drain of the N-type field effect transistor, 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 electrically connect the negative electrode of the 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 and the third electronic switch K3 .

It should be noted that the control circuit 100 of the first embodiment of the present application may also include the fifth resistor R5 (as shown in FIG. 3), and the fifth resistor R5 is a sampling resistor for detecting the control circuit 100 The charging current. One end of the fifth resistor R5 is used to electrically connect the negative electrode of the 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, the circuit diagram of the first embodiment of the control circuit 100 of the present application is taken as an example for description:

When in use, the control circuit 100 does not include the pre-discharge switch circuit, and the cell unit 300 is in a standby state, that is, a non-charging state. In order to avoid power loss, the cell unit 300 enters a sleep state, the first electronic switch K1 and the second electronic switch K2 are both in an off state, and the battery management system 200 is in a sleep state. When the charger is connected through the external port 400, an input signal is generated. The charger output voltage is 83V, which can trigger the photocoupler U1 to turn on. The input signal passes through the first resistor R1, the second resistor R2, the diode D1, the first zener diode ZD1, and the second zener diode ZD2 connected in parallel, and then the input signal is converted by the conductive photocoupler U1 To drive the signal, the microcontroller connected to the photocoupler U1 is triggered by the drive signal interruption to wake up the battery management system, thereby turning on the second electronic switch K2 to form a power supply loop for the The battery cell 300 is charged.

In another embodiment, the circuit diagram of the second embodiment of the control circuit 100 of the present application is taken as an example for description:

Since it is necessary to continuously supply power to the loads of the control circuit 100 (such as meters and lights of an electric vehicle) through pre-discharge, the pre-discharge switch module 15 needs to maintain a constant power output. That is, 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 battery management system is awakened by connecting a charger through the external port 400, the second electronic switch K2 is in a conducting state. Because there is a diode inside the second electronic switch K2, and the discharge direction is turned on. Therefore, the normal output voltage can be obtained in the battery cell unit 300. When the first electronic switch K1 is also in the on state, the battery cell unit 300 can still obtain the output voltage due to the existence of the pre-discharge switch module 15.

When the output voltage range of the cell unit 300 is 81.2V-83V, both the cell unit 300 and the connected charger can activate the control circuit 100, and it cannot be determined that the driving signal comes from The battery cell unit 300 is also a charger. Therefore, the battery management system 200 does not enter a sleep state, and needs to determine whether the battery cell unit 300 is charging by detecting the current of the power supply loop.

When the voltage of the battery cell unit 300 is less than 81.2V, the battery cell unit 300 cannot enable the control circuit 100, the battery cell unit 300 can enter a low-power sleep state, and the battery management system 200 also Enter the sleep state; when the 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 Enter the normal charging state.

In the control circuit 100 and the battery management system 200 provided with the control circuit 100 in the above-mentioned embodiment, the signal input from the external port 400 is converted into a driving signal through the charging wake-up circuit 10, and the microcontroller is awakened by the driving signal 12. Control the switch module 11 to be turned on or off by the control signal of the microcontroller 12. In this way, the control circuit 100 and the battery management system 200 provided by the embodiment of the present application can wake up the battery management system 200 for charging management when the charger 500 is connected to the battery cell unit 300, and put the battery management system 200 to sleep after the charging ends. To avoid power loss or secondary overcharging of the battery pack, the control circuit 100 has the characteristics of simple circuit, low cost, stable and reliable performance.

Those of ordinary skill in the art should realize that the above implementations are only used to illustrate the application, not as a limitation to the application, as long as they are within the essential spirit of the application, the above examples are appropriately made. Changes and changes fall within the scope of protection claimed by this application.

Claims

A control circuit applied to an electrochemical device, characterized in that the control circuit includes a charging wake-up circuit, a switch module, and a microcontroller;

The switch module is used to electrically connect the cell unit of the electrochemical device and the power supply circuit of the external port of the electrochemical device, and is used to control the on or off of the power supply circuit;

The microcontroller is electrically connected to the charging wake-up circuit, and the microcontroller is also electrically connected to the switch module; the microcontroller and the charging wake-up circuit are used to electrically connect the battery cell unit to the external port;

The charging wake-up circuit is used to convert the signal input from the external port into a drive signal, wake up the microcontroller by the drive signal, and control the switch module to be turned on by the control signal of the microcontroller Or cut off, wherein the charging and wake-up circuit includes a first resistor, a first zener diode, a second zener diode, and a photocoupler, and one end of the first resistor is used to electrically connect to the anode of the external port, The other end of the first resistor is electrically connected to the cathode of the first Zener diode, the anode of the first Zener diode is electrically connected to the cathode of the second Zener diode, and the second Zener diode The anode is electrically connected to the photocoupler.
The control circuit according to claim 1, wherein the charging and wake-up circuit further comprises a second resistor, the second resistor is connected in parallel with the first resistor, and the parallel connected first resistor is connected to the first resistor. One end of the two resistors is used to be electrically connected to the anode of the external port, and the other end of the first resistor and the second resistor connected in parallel is electrically connected to the cathode of the first Zener diode.
The control circuit of claim 2, wherein the charging and wake-up circuit further comprises a diode, the anode of the diode is electrically connected to the first resistor and the second resistor connected in parallel, and the diode The cathode is electrically connected with the cathode of the first Zener diode.
The control circuit according to claim 1, wherein the charging wake-up circuit further comprises a third resistor, the first end of the photocoupler is electrically connected to the anode of the second Zener diode, and the photoelectric The second end of the coupler is used to electrically connect to the negative pole of the external port, the third end of the photocoupler is grounded, the fourth end of the photocoupler is electrically connected to the microcontroller, and the photoelectric coupler is electrically connected to the microcontroller. The fourth end of the coupler is also electrically connected to the power supply of the control circuit through the third resistor.
The control circuit of claim 1, wherein the switch module comprises a first electronic switch and a second electronic switch, and the first end of the first electronic switch is electrically connected to the charging pin of the microcontroller , The second terminal of the first electronic switch is used to electrically connect the negative electrode of the external port, the third terminal of the first electronic switch is electrically connected to the third terminal of the second electronic switch, and the second electronic switch The first terminal of the switch is electrically connected to the discharge pin of the microcontroller, the second terminal of the second electronic switch is used to electrically connect the negative electrode of the battery cell, and the third terminal of the second electronic switch is electrically connected Connect the third terminal of the first electronic switch.
The control circuit of claim 5, wherein the switch module further comprises a third electronic switch and a fourth resistor, and the first end of the third electronic switch is electrically connected to the pre-discharge lead of the microcontroller Pin, the second end of the third electronic switch is used to electrically connect with the negative electrode of the battery cell unit, and the third end of the third electronic switch is electrically connected to the first electronic switch through the fourth resistor And the second electronic switch.
The control circuit according to claim 6, wherein the control circuit further comprises a fifth resistor for detecting the charging current of the control circuit, and one end of the fifth resistor is used for electrically connecting the battery core The negative pole of the unit and the other end of the fifth resistor are electrically connected to the second end of the first electronic switch and the third electronic switch.
A battery management system, wherein the battery management system includes the control circuit according to any one of claims 1 to 7.
The battery management system according to claim 8, wherein the control circuit further comprises a collection module, and the collection module is configured to be electrically connected between the battery cell unit and the microcontroller, and is used to collect the battery cell. The parameters of the unit.
An electrochemical device, the electrochemical device comprising a cell unit, characterized in that the electrochemical device further comprises the control circuit according to any one of claims 1 to 7, the control circuit is used to control the The charging and discharging of the battery cell unit.