CN215185960U - Battery protection circuit, battery management system and consumer - Google Patents
Battery protection circuit, battery management system and consumer Download PDFInfo
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- CN215185960U CN215185960U CN202121144878.4U CN202121144878U CN215185960U CN 215185960 U CN215185960 U CN 215185960U CN 202121144878 U CN202121144878 U CN 202121144878U CN 215185960 U CN215185960 U CN 215185960U
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Abstract
The application discloses battery protection circuit, battery management system and consumer. The battery protection circuit of one embodiment of the application comprises a detection circuit, a drive circuit and a switch circuit; the detection circuit is electrically connected with the battery anode, the battery cathode and the driving circuit, the driving circuit is electrically connected with the switch circuit, and the switch circuit is electrically connected with the power circuit; the detection circuit is used for detecting the voltage of the battery and transmitting a driving signal to the driving circuit; the driving circuit is used for driving the switch circuit to be switched on or switched off according to the driving signal so as to control the activation signal to be input to the power supply circuit. The battery management system can solve the problem that the battery is activated by an external signal when the battery is in an undervoltage state, can effectively prevent potential safety hazards and capacity loss of the battery due to deep discharge, and improves user experience.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery protection circuit, a battery management system and electric equipment.
Background
In an energy storage System, a Power supply of a Battery Management System (BMS) usually requires an external signal for activation, such as key activation, port voltage activation, or Power Conversion System (PCS) activation. When the battery management system detects that the battery is in an undervoltage state, a software method is generally adopted to shut down the battery management system. However, when the activation signal exists continuously, the software method cannot keep the battery management system powered off, and the battery management system in the activated state consumes the battery power continuously, so that the battery is over-discharged in a short time, and the battery capacity is lost.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a battery protection circuit, a battery management system and a power consumption device, which can solve the problem that the battery management system is activated by an external signal when the battery is in an under-voltage state.
The battery protection circuit of one embodiment of the application comprises a detection circuit, a drive circuit and a switch circuit; the detection circuit is electrically connected with the battery anode, the battery cathode and the driving circuit, the driving circuit is electrically connected with the switch circuit, and the switch circuit is electrically connected with the power circuit; the detection circuit is used for detecting the voltage of the battery and transmitting a driving signal to the driving circuit; the driving circuit is used for driving the switch circuit to be switched on or switched off according to the driving signal; and controlling the power supply circuit to acquire an activation signal by switching on or off the switch circuit.
In one embodiment, the detection circuit comprises a first resistor, a second resistor and a voltage stabilizing diode; the first resistor is electrically connected to the battery anode, the second resistor and the driving circuit, the second resistor is electrically connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is electrically connected to the battery cathode.
In another embodiment, the driving circuit includes a third resistor, a first switching tube and a second switching tube; the first end of the first switch tube is electrically connected to the positive electrode of the battery, the second end of the first switch tube is electrically connected to the detection circuit, and the third end of the first switch tube is electrically connected to the third resistor; the first end of the second switch tube is electrically connected to the switch circuit, the second end of the second switch tube is electrically connected to the third resistor, and the third end of the second switch tube is electrically connected to the negative electrode of the battery.
In another embodiment, the switching circuit includes a fourth resistor and a third switching tube; the fourth resistor is electrically connected to the driving circuit, the second end of the third switching tube and the first end of the third switching tube, and the third end of the third switching tube is electrically connected to the power circuit.
In another embodiment, when the battery voltage is higher than a predetermined under-voltage threshold, the detection circuit transmits a first driving signal to the driving circuit; the driving circuit drives the switch circuit to be conducted through the first driving signal, and the power circuit obtains the activation signal.
In another embodiment, when the battery voltage is lower than the preset under-voltage threshold, the detection circuit transmits a second driving signal to the driving circuit; the driving circuit drives the switch circuit to be switched off through the second driving signal, and the power supply circuit cannot acquire the activation signal.
In another embodiment, the detection circuit transmits a first driving signal to the driving circuit when the battery voltage is higher than the reverse breakdown voltage of the zener diode; the driving circuit drives the switch circuit to be conducted through the first driving signal, and the power circuit obtains the activation signal.
In another embodiment, the detection circuit transmits a second driving signal to the driving circuit when the battery voltage is lower than a reverse breakdown voltage of the zener diode; the driving circuit drives the switch circuit to be switched off through the second driving signal, and the power supply circuit cannot acquire the activation signal.
A battery management system according to another embodiment of the present application includes a power circuit and the battery protection circuit described in any one of the above; the battery protection circuit is electrically connected with the power supply circuit, and the battery protection circuit and the power supply circuit are both electrically connected with a battery anode and a battery cathode; the battery protection circuit is used for controlling the power supply circuit to obtain an activation signal.
The electric equipment of another embodiment of this application includes battery and the battery management system, the battery is used for supplying power for the battery management system.
This application detects battery voltage through detection circuitry to transmission drive signal to drive circuit, drive circuit basis drive signal drive switch circuit switches on or breaks off to control power supply circuit acquires the activating signal, can solve the problem that battery management system is activated by external signal when the battery is in the undervoltage state, and can prevent the potential safety hazard and the capacity loss that the battery produced because degree of depth is discharged effectively, promote user experience. In addition, the circuit design of this application is simple, the reliability is high and with low costs, still has the characteristics that can set up the undervoltage threshold value in a flexible way simultaneously, can extensively use on the product platform of different voltage classes.
Drawings
Fig. 1 is a block diagram of a battery management system according to an embodiment of the present application.
Fig. 2 is a block diagram of a battery management system according to another embodiment of the present application.
Fig. 3 is a circuit diagram of a battery management system according to an embodiment of the present application.
Description of the main elements
100 battery management system
110 battery protection circuit
120 power supply circuit
B + battery positive electrode
B-battery cathode
111 detection circuit
112 driving circuit
113 switching circuit
R1-R4 first to fourth resistors
D1 zener diode
Q1-Q2 first to second triodes
Q3 field effect transistor
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and the described embodiments are merely a subset of the embodiments of the present application and are not intended to be a complete embodiment.
Fig. 1 is a block diagram of a battery management system 100 according to an embodiment of the present application. As shown in fig. 1, the battery management system 100 includes a battery protection circuit 110 and a power supply circuit 120. The battery protection circuit 110 is electrically connected to the power circuit 120, and both the battery protection circuit 110 and the power circuit 120 are electrically connected to a battery positive electrode B + and a battery negative electrode B-.
The battery protection circuit 110 is used to control the power circuit 120 to obtain an activation signal.
It is understood that the sources of the activation signal include: key or port voltage. The activation signal is generated, for example, when a key is activated or the port voltage reaches a voltage threshold. The activation signal is transmitted to the power circuit 120, which can activate the power circuit 120, so that the power circuit 120 operates.
The power circuit 120 supplies power to the battery management system 100, directly obtains a battery voltage, and converts the battery voltage into an input voltage of the battery management system 100 through a direct current-direct current (DC/DC) converter.
Fig. 2 is a block diagram of a battery management system 100 according to another embodiment of the present application. Referring to fig. 2, the battery protection circuit 110 includes a detection circuit 111, a driving circuit 112, and a switch circuit 113. The detection circuit 111 is electrically connected to the battery anode B +, the battery cathode B-, and the driving circuit 112. The driving circuit 112 is electrically connected to the switching circuit 113. The switch circuit 113 is electrically connected to the power supply circuit 120.
The detection circuit 111 is used for detecting the battery voltage and transmitting a driving signal to the driving circuit 112.
The driving circuit 112 drives the switch circuit 113 to be turned on or off according to the driving signal.
The power circuit 120 is controlled to obtain the activation signal by turning on or off the switch circuit 113.
In one embodiment, the detection circuit 111 transmits a first driving signal to the driving circuit 112 when the battery voltage is higher than a predetermined under-voltage threshold. The driving circuit 112 obtains the first driving signal, and drives the switch circuit 113 to be turned on by the first driving signal. By turning on the switch circuit 113, the power supply circuit 120 obtains the activation signal, so as to activate the power supply circuit 120, and the power supply circuit 120 operates.
When the battery voltage is lower than the predetermined under-voltage threshold, the detection circuit 111 transmits a second driving signal to the driving circuit 112. The driving circuit 112 obtains the second driving signal, and drives the switch circuit 113 to be turned off by the second driving signal. By the opening of the switch circuit 113, the power supply circuit 120 cannot acquire the activation signal, and the power supply circuit 120 stops operating.
In one embodiment, the first driving signal is a high level signal, and the second driving signal is a low level signal.
Fig. 3 is a circuit diagram of a battery management system 100 according to an embodiment of the present application. Referring to fig. 1 to fig. 3, the battery management system 100 includes the detection circuit 111, the driving circuit 112, the switch circuit 113, and the power circuit 120.
The detection circuit 111 includes a first resistor R1, a second resistor R2, and a zener diode D1. The first resistor R1 is electrically connected to the battery positive electrode B +, the second resistor R2 and the driving circuit 112. The second resistor R2 is electrically connected to the negative electrode of the zener diode D1, and the positive electrode of the zener diode D1 is electrically connected to the battery negative electrode B-.
The driving circuit 112 includes a third resistor R3, a first transistor Q1, and a second transistor Q2. The first triode Q1 is a PNP triode, and the second triode Q2 is an NPN triode. The emitter of the first triode Q1 is electrically connected to the battery anode B +, the base of the first triode Q1 is electrically connected to the first resistor R1 and the second resistor R2, and the collector of the first triode Q1 is electrically connected to the third resistor R3. The collector of the second transistor Q2 is electrically connected to the switch circuit 113, the base of the second transistor Q2 is electrically connected to the third resistor R3, and the emitter of the second transistor Q2 is electrically connected to the battery cathode B-.
The switch circuit 113 includes a fourth resistor R4 and a fet Q3. The fourth resistor R4 is electrically connected to the collector of the second transistor Q2, the gate of the fet Q3 and the source of the fet Q3. The drain of the fet Q3 is electrically connected to the power supply circuit 120.
In an embodiment, the first resistor R1 and the second resistor R2 are used for voltage division. When the battery voltage is higher than the reverse breakdown voltage of the zener diode D1, the zener diode D1 is broken down in the reverse direction, the first resistor R1 and the second resistor R2 divide the voltage in proportion to the resistance value, and output a driving signal to the driving circuit 112. Wherein the driving signal is a high level signal.
When the battery voltage is lower than the reverse breakdown voltage of the zener diode D1, since the reverse resistance of the zener diode D1 is very large, the voltage drop between the battery anode B + and the battery cathode B-is almost borne by the zener diode D1, and there is almost no voltage drop across the first resistor R1 and the second resistor R2. At this time, the driving signal output to the driving circuit 112 is a low level signal.
In this embodiment, the predetermined under-voltage threshold can be adjusted by adjusting the value of the reverse breakdown voltage of the zener diode D1.
When the driving signal is a high level signal, the first transistor Q1 and the second transistor Q2 are sequentially turned on, and the driving circuit 112 is turned on. Since the second transistor Q2 is turned on, the gate of the fet Q3 and the fourth resistor R4 are both connected to the battery negative B-via the turned-on second transistor Q2. When the activation signal is input, a voltage difference is generated between the source and the gate of the fet Q3, so that the fet Q3 is turned on. The activation signal is transmitted to the power circuit 120 through the turned-on fet Q3. The power circuit 120 starts operating after receiving the activation signal.
When the driving signal is a low level signal, the first transistor Q1 and the second transistor Q2 are sequentially turned off, and the driving circuit 112 is turned off. At this time, the gate of the fet Q3 and the fourth resistor R4 are both floating, and the fet Q3 is turned off. When the activation signal is input, the activation signal cannot be transmitted to the power supply circuit 120 through the fet Q3 that is turned off. The power circuit 120 cannot be activated and thus stops operating.
In this embodiment, the first transistor Q1 and the second transistor Q2 may be replaced by fets. The fet Q3 may also be replaced by a triode.
When the first transistor Q1 is replaced by a first fet, the source of the first fet is electrically connected to the battery positive electrode B +, the gate of the first fet is electrically connected to the first resistor R1 and the second resistor R2, and the drain of the first fet is electrically connected to the third resistor R3.
When the second transistor Q2 is replaced by a second field effect transistor, the source of the second field effect transistor is electrically connected to the battery cathode B-, the gate of the second field effect transistor is electrically connected to the third resistor R3, and the drain of the second field effect transistor is electrically connected to the switch circuit 113.
In the embodiment of the present application, the switching tube includes a field effect transistor or a triode.
The embodiment of the application further provides electric equipment, the electric equipment comprises a battery and the battery management system, and the battery is used for supplying power to the battery management system.
It is understood that the electric devices include, but are not limited to, unmanned planes, electric vehicles, power tools, energy storage products, and the like.
The electric tool includes, but is not limited to, an electric screwdriver, an electric drill, an electric wrench, an angle grinder, a steel machine, an electric pick, an electric hammer, a marble machine, a jig saw, and the like. The energy storage product includes, but is not limited to, a mobile phone, a tablet, an electronic book reader, a computer, a workstation, a server, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), an MPEG-1 audio layer 3(MP3) Player, a mobile medical device, a camera, a wearable device, a photovoltaic inverter, a wind power converter, an energy storage system, a new energy automobile driving system, a photovoltaic device, and the like.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (10)
1. A battery protection circuit is characterized by comprising a detection circuit, a drive circuit and a switch circuit;
the detection circuit is electrically connected with the battery anode, the battery cathode and the driving circuit, the driving circuit is electrically connected with the switch circuit, and the switch circuit is electrically connected with the power circuit;
the detection circuit is used for detecting the voltage of the battery and transmitting a driving signal to the driving circuit;
the driving circuit is used for driving the switch circuit to be switched on or switched off according to the driving signal;
and controlling the power supply circuit to acquire an activation signal by switching on or off the switch circuit.
2. The battery protection circuit of claim 1, wherein the detection circuit comprises a first resistor, a second resistor, and a zener diode;
the first resistor is electrically connected to the battery anode, the second resistor and the driving circuit, the second resistor is electrically connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is electrically connected to the battery cathode.
3. The battery protection circuit of claim 1, wherein the driving circuit comprises a third resistor, a first switch tube and a second switch tube;
the first end of the first switch tube is electrically connected to the positive electrode of the battery, the second end of the first switch tube is electrically connected to the detection circuit, and the third end of the first switch tube is electrically connected to the third resistor; the first end of the second switch tube is electrically connected to the switch circuit, the second end of the second switch tube is electrically connected to the third resistor, and the third end of the second switch tube is electrically connected to the negative electrode of the battery.
4. The battery protection circuit of claim 1, wherein the switching circuit comprises a fourth resistor and a third switching tube;
the fourth resistor is electrically connected to the driving circuit, the second end of the third switching tube and the first end of the third switching tube, and the third end of the third switching tube is electrically connected to the power circuit.
5. The battery protection circuit of claim 1, wherein the detection circuit transmits a first driving signal to the driving circuit when the battery voltage is higher than a predetermined undervoltage threshold;
the driving circuit drives the switch circuit to be conducted through the first driving signal, and the power circuit obtains the activation signal.
6. The battery protection circuit of claim 5, wherein the detection circuit transmits a second drive signal to the drive circuit when the battery voltage is below the preset under-voltage threshold;
the driving circuit drives the switch circuit to be switched off through the second driving signal, and the power supply circuit cannot acquire the activation signal.
7. The battery protection circuit of claim 2, wherein the detection circuit transmits a first drive signal to the drive circuit when the battery voltage is above a reverse breakdown voltage of the zener diode;
the driving circuit drives the switch circuit to be conducted through the first driving signal, and the power circuit obtains the activation signal.
8. The battery protection circuit of claim 7, wherein the detection circuit transmits a second drive signal to the drive circuit when the battery voltage is below a reverse breakdown voltage of the zener diode;
the driving circuit drives the switch circuit to be switched off through the second driving signal, and the power supply circuit cannot acquire the activation signal.
9. A battery management system, characterized in that the battery management system comprises a power supply circuit and a battery protection circuit according to any one of claims 1 to 8;
the battery protection circuit is electrically connected with the power supply circuit, and the battery protection circuit and the power supply circuit are both electrically connected with a battery anode and a battery cathode;
the battery protection circuit is used for controlling the power supply circuit to obtain an activation signal.
10. A powered device, wherein the powered device comprises a battery and the battery management system of claim 9, wherein the battery is configured to power the battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121144878.4U CN215185960U (en) | 2021-05-26 | 2021-05-26 | Battery protection circuit, battery management system and consumer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121144878.4U CN215185960U (en) | 2021-05-26 | 2021-05-26 | Battery protection circuit, battery management system and consumer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215185960U true CN215185960U (en) | 2021-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121144878.4U Active CN215185960U (en) | 2021-05-26 | 2021-05-26 | Battery protection circuit, battery management system and consumer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215185960U (en) |
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2021
- 2021-05-26 CN CN202121144878.4U patent/CN215185960U/en active Active
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