CN223613065U - A protection circuit and electronic device applied to the positive terminal of a battery. - Google Patents
A protection circuit and electronic device applied to the positive terminal of a battery.Info
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- CN223613065U CN223613065U CN202422902448.4U CN202422902448U CN223613065U CN 223613065 U CN223613065 U CN 223613065U CN 202422902448 U CN202422902448 U CN 202422902448U CN 223613065 U CN223613065 U CN 223613065U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The application relates to the technical field of battery protection and discloses a protection circuit and electronic equipment applied to the anode of a battery, wherein the circuit comprises a main control circuit, a driving circuit, a charge-discharge circuit and a protection logic control circuit, wherein the protection logic control circuit is used for respectively controlling the on/off of a plurality of protection control circuits according to the voltage of the battery and the output voltage, outputting detection voltage to the main control circuit, determining the current state of the battery according to the detection voltage by the main control circuit, and outputting a control signal corresponding to the current state to the driving circuit; the charging and discharging circuit controls the charging and discharging circuit to be switched on or off based on the driving signal so as to control the charging and discharging of the battery. Therefore, the application can judge whether the current state of the battery needs to be protected based on the battery voltage and the output port voltage so as to control the charge and discharge of the battery at the positive electrode of the battery, thereby improving the protection reliability of the battery.
Description
Technical Field
The present application relates to the field of battery protection technologies, and in particular, to a protection circuit and an electronic device for a battery positive electrode.
Background
In the existing BMS (Battery MANAGEMENT SYSTEM ), a Battery protection circuit is generally provided to improve the safety of the Battery.
In the prior art, a battery protection circuit of a BMS generally adopts a negative electrode protection scheme. However, the negative electrode protection scheme adopts a negative electrode protection IC (INTEGRATED CIRCUIT, chip), since the system side uses the negative electrode P-of the output end as the reference Ground, and after the negative electrode protection scheme enters the protection state, the reference Ground of the system side is in a floating state with respect to GND (Ground) of the BMS, which easily results in a decrease in circuit stability, thereby resulting in a decrease in the use safety of the battery.
Therefore, it is important to provide a technical solution that can improve the battery protection reliability, thereby improving the use safety of the battery.
Disclosure of utility model
The application provides a protection circuit applied to a battery anode and electronic equipment, which can improve the reliability of battery protection, thereby improving the use safety of the battery.
In order to solve the technical problem, a first aspect of the present application discloses a protection circuit applied to a battery anode, the circuit including a main control circuit, a driving circuit, a charge-discharge circuit and a protection logic control circuit, wherein:
The first end of the main control circuit is electrically connected with the first end of the driving circuit, the second end of the main control circuit is electrically connected with the second end of the driving circuit, the third end of the main control circuit is electrically connected with the first end of the protection logic control circuit, and the fourth end of the main control circuit is used for electrically connecting the cathode of the battery with the ground;
the fifth end of the main control circuit, the fifth end of the driving circuit, the third end of the charge-discharge circuit and the second end of the protection logic control circuit are respectively used for being electrically connected with the anode of the battery; the sixth end of the driving circuit, the fourth end of the charge-discharge circuit and the third end of the protection logic control circuit are respectively used for being electrically connected with the positive electrode of the output end;
The protection logic control circuit is used for outputting a detection voltage value to the main control circuit according to the battery voltage value of the battery and the output voltage value of the output end;
the main control circuit is used for determining the current state of the battery according to the detection voltage value so as to output a control signal corresponding to the current state to the driving circuit;
And the driving circuit is used for outputting a driving signal to the charge-discharge circuit according to the control signal and controlling the charge-discharge circuit to be switched on or switched off.
As an optional implementation manner, in the first aspect of the present application, the master control circuit includes a control chip and a chip protection module, where:
The first end of the control chip is electrically connected with the first end of the driving circuit, the second end of the control chip is electrically connected with the second end of the driving circuit, the third end of the control chip is electrically connected with the first end of the protection logic control circuit, the fourth end of the control chip is electrically connected with the positive electrode of the battery, the fifth end of the control chip is electrically connected with the first end of the chip protection module and the negative electrode of the battery respectively and grounded, and the sixth end of the control chip is electrically connected with the second end of the chip protection module and the negative electrode of the output end respectively.
As an optional implementation manner, in the first aspect of the present application, the protection logic control circuit includes a first protection control circuit, a second protection control circuit, and a third protection control circuit, where:
The first end of the first protection control circuit is used for being electrically connected with the positive electrode of the battery, the second end of the first protection control circuit is electrically connected with the first end of the second protection control circuit, the third end of the first protection control circuit is respectively electrically connected with the first end of the third protection control circuit and the third end of the main control circuit, the second end of the second protection control circuit is electrically connected with the second end of the third protection control circuit, the third end of the second protection control circuit is used for being electrically connected with the positive electrode of the output end, and the fourth end of the second protection control circuit is respectively electrically connected with the third end of the third protection control circuit;
The first protection control circuit is used for outputting a first voltage value as a detection voltage value to the main control circuit when the output voltage value of the output end meets a preset conduction condition;
and the second protection control circuit is used for controlling the third protection control circuit to be conducted when the output voltage value does not meet the conducting condition so as to output the second voltage value as a detection voltage value to the main control circuit.
As an optional implementation manner, in the first aspect of the present application, the protection logic control circuit further includes a clamp circuit, wherein:
The first end of the clamping circuit is electrically connected with the third end of the main control circuit, and the second end of the clamping circuit is electrically connected with the third end of the first protection control circuit and the first end of the third protection control circuit respectively;
the clamping circuit is used for clamping the detection voltage value to the first voltage value or the second voltage value.
As an optional implementation manner, in the first aspect of the present application, the first protection control circuit includes a first port protection module, a first conduction control module, and a voltage stabilizing module, where:
The first end of the first port protection module is used for being electrically connected with the anode of the battery, the second end of the first port protection module is electrically connected with the first end of the first conduction control module, the second end of the first conduction control module is electrically connected with the first end of the voltage stabilizing module, the third end of the first conduction control module is electrically connected with the second end of the clamping circuit and the first end of the third protection control circuit respectively, and the second end of the voltage stabilizing module is electrically connected with the first end of the second protection control circuit.
As an alternative implementation manner, in the first aspect of the present application, the first port protection module includes a first diode, where an anode of the first diode is used to electrically connect to an anode of the battery, and a cathode of the first diode is electrically connected to the first end of the first conduction control module;
The first conduction control module comprises a first switching device, a third resistor and a fourth resistor, wherein the first end of the first switching device is electrically connected with the second end of the first port protection module and the first end of the third resistor respectively, the second end of the first switching device is electrically connected with the second end of the third resistor and the first end of the voltage stabilizing module respectively, the third end of the first switching device is electrically connected with the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected with the second end of the clamping circuit and the first end of the third protection control circuit respectively;
The voltage stabilizing module comprises a voltage stabilizing diode, wherein the negative electrode of the voltage stabilizing diode is electrically connected with the second end of the first conduction control module, and the positive electrode of the voltage stabilizing diode is electrically connected with the first end of the second protection control circuit.
As an optional implementation manner, in the first aspect of the present application, the second protection control circuit includes a second port protection module, a second conduction control module, and a third port protection module, where:
The first end of the second port protection module is used for being electrically connected with the positive electrode of the output end, the second end of the second port protection module is electrically connected with the first end of the second conduction control module, the second end of the second conduction control module is electrically connected with the first end of the third port protection module and the second end of the third protection control circuit respectively, the second end of the third port protection module is electrically connected with the second end of the first protection control circuit, the third end of the second conduction control module is electrically connected with the second end of the third port protection module, and the third end of the third port protection module and the fourth end of the third port protection module are electrically connected with the fourth end of the second protection control circuit and the negative electrode of the output end respectively.
As an optional implementation manner, in the first aspect of the present application, the third protection control circuit includes a third conduction control module and a current limiting module, where:
The first end of the third conduction control module is electrically connected with the second end of the clamping circuit and the third end of the first protection control circuit respectively, the second end of the third conduction control module is electrically connected with the first end of the current limiting module, the second end of the current limiting module is electrically connected with the second end of the second protection control circuit, and the third end of the third conduction control module is used for electrically connecting the third end of the third protection control circuit and the negative electrode of the output end.
As an optional implementation manner, in the first aspect of the present application, the charge-discharge circuit includes a discharge control module and a charge control module, where:
The first end of the discharging control module is electrically connected with the third end of the driving circuit, the first end of the charging control module is electrically connected with the fourth end of the driving circuit, the second end of the discharging control module is electrically connected with the second end of the charging control module, and the third end of the discharging control module and the fifth end of the driving circuit are respectively used for being electrically connected with the positive electrode of the battery;
The discharging control module is used for controlling the battery to discharge to a load when the driving signal controls the discharging control module to be conducted;
And the charging control module is used for controlling a power supply to charge the battery when the driving signal controls the charging control module to be conducted.
A second aspect of the present application discloses an electronic device comprising a device body and a protection circuit as disclosed in any one of the first aspects applied to a positive electrode of a battery.
Compared with the prior art, the application has the following beneficial effects:
According to the application, the protection logic control circuit can control the protection control circuits in the protection logic control circuit to be in the on state or the off state respectively according to the battery voltage value of the battery and the output voltage value of the output end so as to output the detection voltage value to the main control circuit; the method comprises the steps of detecting a detection voltage value output by a protection logic control circuit through a main control circuit, determining the current state of a battery according to the detection voltage value, outputting a control signal corresponding to the current state to a driving circuit according to the current state, generating a driving signal corresponding to the control signal through the driving circuit according to the received control signal, outputting the driving signal to a charge-discharge circuit, controlling the charge-discharge circuit to be conducted or cut off based on the received driving signal through the charge-discharge circuit, controlling the battery to discharge to a load or controlling a power supply to charge the battery when the charge-discharge circuit is conducted, controlling the on/off of the protection logic control circuit based on the battery voltage and the output port voltage, judging whether the current state of the battery needs to be protected or not according to the detection voltage values in different on/off states of the protection logic control circuit, and controlling whether the battery can be charged or discharged when the battery is in an activated state or in a protected state or in need of being relieved, so as to effectively protect the positive electrode of the battery, thereby improving the protection timeliness of the battery and the timeliness of the battery protection, further improving the reliability of the battery protection, being beneficial to stopping the battery in case of safety risk and stopping the battery in time and allowing the battery to be reused in case of safety risk, after the control signal output by the main control circuit is processed by the driving circuit, a more stable and accurate driving signal is output to the charging and discharging circuit, so that the signal output accuracy and the output stability can be improved, the driving reliability and the control reliability of the charging and discharging circuit are improved, the control reliability of whether the battery can be charged and discharged at the positive electrode of the battery is further improved, the protection timeliness and the release protection timeliness of the battery are further improved, and the reliability of the battery protection is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a protection circuit applied to a battery anode according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another protection circuit applied to a battery positive electrode according to an embodiment of the present application;
Fig. 3 is a schematic structural diagram of a protection circuit for a battery anode according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a protection logic control circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, unless explicitly specified and limited otherwise, the term "electrically connected" in the description of the present application and in the claims and the above-mentioned drawings should be understood in a broad sense, for example, as a fixed electrical connection, as a detachable electrical connection, or as an integral electrical connection, as a mechanical electrical connection, as an electrical connection, or as a communication between each other, as a direct connection, as an indirect connection via an intermediary, as a communication between two elements, or as an interaction between two elements. Furthermore, the terms first, second and the like in the description and in the claims of the application and in the foregoing figures, are used for distinguishing between different objects and not for describing a particular sequential order, and are not intended to cover any exclusive inclusion. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a protection circuit applied to a battery anode according to an embodiment of the application. The circuit may be applied to a circuit that uses a Battery to perform charge/discharge, and may also be applied to a BMS (Battery MANAGEMENT SYSTEM ), which is not limited in the embodiment of the present application. As shown in fig. 1, the protection circuit applied to the positive electrode of the battery may include a main control circuit 101, a driving circuit 102, a charge and discharge circuit 103, and a protection logic control circuit 104, wherein:
The first end of the main control circuit 101 is electrically connected with the first end of the driving circuit 102, the second end of the main control circuit 101 is electrically connected with the second end of the driving circuit 102, the third end of the main control circuit 101 is electrically connected with the first end of the protection logic control circuit 104, and the fourth end of the main control circuit 101 is used for electrically connecting the cathode of the battery and grounding;
The fifth end of the main control circuit 101, the fifth end of the driving circuit 102, the third end of the charge-discharge circuit 103 and the second end of the protection logic control circuit 104 are respectively used for being electrically connected with the positive electrode of the battery, the sixth end of the driving circuit 102, the fourth end of the charge-discharge circuit 103 and the third end of the protection logic control circuit 104 are respectively used for being electrically connected with the positive electrode of the output end, and the sixth end of the main control circuit 101 and the fourth end of the protection logic control circuit 104 are respectively used for being electrically connected with the negative electrode of the output end;
The protection logic control circuit 104 is configured to output a detection voltage value to the master control circuit 101 according to a battery voltage value of the battery and an output voltage value of the output terminal;
a main control circuit 101 for determining a current state of the battery according to the detected voltage value to output a control signal corresponding to the current state to the driving circuit 102;
The driving circuit 102 is configured to output a driving signal to the charge/discharge circuit 103 according to the control signal, so as to control the charge/discharge circuit 103 to be turned on or off.
Optionally, the descriptions of the main control circuit 101, the driving circuit 102, the charge-discharge circuit 103, and the protection logic control circuit 104 above may be specifically:
The protection logic control circuit 104 is configured to control, according to a battery voltage value of the battery and an output voltage value of the output terminal, a plurality of protection control circuits in the protection logic control circuit 104 to be in an on state/off state respectively, so as to output a detection voltage value to the main control circuit 101;
The main control circuit 101 is used for detecting the detection voltage value output by the protection logic control circuit 104, determining the current state of the battery according to the detection voltage value, and outputting a control signal corresponding to the current state to the driving circuit 102 according to the current state, wherein the current state comprises at least one of a battery connection state, an activation state, a protection state and a deprotection state;
A driving circuit 102, configured to generate a driving signal corresponding to the control signal according to the received control signal, and output the driving signal to a charge-discharge circuit 103;
And the charge and discharge circuit 103 is used for controlling the charge and discharge circuit 103 to be switched on or off based on the received driving signal, and controlling the battery to discharge to the load or controlling the power supply to charge the battery when the charge and discharge circuit 103 is switched on.
The battery connection state may optionally include a load connection state or a charger connection state, the activation state may include a primary power-on state or a charging activation state, the protection state may include one of an overcharge protection state, an overdischarge protection state, a discharge overcurrent protection state, a charge overcurrent protection state and a charger reverse connection protection state, and the deprotection state may be a state of recovering from any one of the protection states to a normal working state.
Fig. 3 is a schematic structural diagram of another protection circuit applied to a battery anode, which is disclosed in the embodiment of the present application, where, as shown in fig. 3, the battery anode may be a b+ as shown in fig. 3, the output end anode may be a p+ as shown in fig. 3, and the output end cathode may be a P-as shown in fig. 3.
It can be seen that the embodiment of the application can control a plurality of protection control circuits in the protection logic control circuit to be in an on state/off state respectively according to the battery voltage value of the battery and the output voltage value of the output end, so as to output detection voltage values to a main control circuit, detect the detection voltage values output by the protection logic control circuit through the main control circuit, determine the current state of the battery according to the detection voltage values, output control signals corresponding to the current state to a driving circuit according to the current state, wherein the current state comprises at least one of a battery connection state, an activation state, a protection state and a protection release state, and control the on/off state of a charging/discharging circuit through the driving circuit according to the received control signals.
In an alternative embodiment, fig. 2 is a schematic structural diagram of another protection circuit applied to a battery positive electrode according to an embodiment of the present application, and as shown in fig. 2, the main control circuit 101 may include a control chip 1011 and a chip protection module 1012, where:
The first end of the control chip 1011 is electrically connected with the first end of the driving circuit 102, the second end of the control chip 1011 is electrically connected with the second end of the driving circuit 102, the third end of the control chip 1011 is electrically connected with the first end of the protection logic control circuit 104, the fourth end of the control chip 1011 is used for electrically connecting with the positive electrode of the battery, the fifth end of the control chip 1011 is used for electrically connecting with the first end of the chip protection module 1012 and the negative electrode of the battery respectively and grounding, and the sixth end of the control chip 1011 is used for electrically connecting with the second end of the chip protection module 1012 and the negative electrode of the output end respectively.
Optionally, the main control circuit 101 determines the current state of the battery according to the detected voltage value, specifically, the control chip 1011 may compare the detected voltage value with a preset voltage value set to obtain a voltage comparison result, and then determine the current state of the battery according to the voltage comparison result.
The preset voltage value set may include at least one preset detection voltage value, and optionally, the preset detection voltage value may be one of a preset load detection voltage value, a preset charger removal detection voltage, and a preset battery full charge voltage value, which is not limited in the embodiment of the present application.
Therefore, the state judgment and control signal output functions of the main control circuit are realized through the control chip and the chip protection module, wherein the battery state is judged through the preset judgment logic and the preset voltage value set of the control chip, the judgment efficiency and the judgment accuracy of the battery state can be improved, the output accuracy of the control signal is improved, the on/off control accuracy of the charge/discharge circuit is improved, the control efficiency and the control accuracy of controlling the charge/discharge of the battery at the positive electrode of the battery are improved, the protection timeliness and the release protection timeliness of the battery are further improved, and the use safety of the control chip can be improved through the arrangement of the chip protection module.
Optionally, as shown in fig. 3, the control chip 1011 may be a negative electrode protection IC (INTEGRATED CIRCUIT, chip), and the chip protection module 1012 may include a first resistor R1, where:
The first end of the negative electrode protection IC is electrically connected with the first end of the driving circuit 102, the second end of the negative electrode protection IC is electrically connected with the second end of the driving circuit 102, the third end of the negative electrode protection IC is electrically connected with the first end of the protection logic control circuit 104, the fourth end of the negative electrode protection IC is used for being electrically connected with the positive electrode of the battery, the fifth end of the negative electrode protection IC is used for being respectively electrically connected with the first end of the first resistor R1, the negative electrode of the battery and the ground, and the sixth end of the negative electrode protection IC is used for being respectively electrically connected with the second end of the first resistor R1 and the negative electrode of the output end.
In the case of the protection scheme using the negative electrode protection IC (as shown in fig. 3), the PMOS in the driving circuit control main loop is built, however, after the scheme enters the protection state, since GND of the BMS is directly connected to the negative electrode P-of the output terminal, the negative electrode protection IC cannot realize the protection state releasing function by detecting the voltage of the negative electrode P-of the output terminal, and therefore, the protection logic control circuit needs to be built outside to realize the protection state releasing function.
Therefore, compared with the prior art, the negative electrode protection IC is selected as the control chip, the charge-discharge circuit can avoid systematically suspending or raising the reference ground of the system end (namely, avoid the pressure difference between the reference ground of the system end and the GND of the BMS) when being cut off, the model selection range of the control chip can be enlarged compared with the positive electrode protection IC, the flexibility of selecting the control chip can be improved, the research and development cost of a battery protection scheme can be reduced, and the use protection cost of the chip can be reduced and the use safety of the chip can be improved by selecting the resistor as the chip protection module.
In another alternative embodiment, as shown in fig. 2, the protection logic control circuit 104 may include a first protection control circuit 1041, a second protection control circuit 1042, and a third protection control circuit 1043, where:
The first end of the first protection control circuit 1041 is used for electrically connecting the positive electrode of the battery, the second end of the first protection control circuit 1041 is electrically connected with the first end of the second protection control circuit 1042, the third end of the first protection control circuit 1041 is respectively electrically connected with the first end of the third protection control circuit 1043 and the third end of the main control circuit 101, the second end of the second protection control circuit 1042 is electrically connected with the second end of the third protection control circuit 1043, the third end of the second protection control circuit 1042 is used for electrically connecting the positive electrode of the output end, and the fourth end of the second protection control circuit 1042 and the third end of the third protection control circuit 1043 are respectively used for electrically connecting the negative electrode of the output end;
A first protection control circuit 1041, configured to output the first voltage value as a detection voltage value to the main control circuit 101 when the output voltage value of the output terminal meets a preset conduction condition;
The second protection control circuit 1042 is configured to control the third protection control circuit 1043 to turn on when the output voltage value does not satisfy the on condition, so as to output the second voltage value as the detection voltage value to the main control circuit 101.
Alternatively, the descriptions of the first protection control circuit 1041, the second protection control circuit 1042, and the third protection control circuit 1043 described above may be specifically:
The first protection control circuit 1041 is configured to control the first protection control circuit 1041 to be turned on when the output voltage value of the output terminal meets a preset conduction condition, and output a first voltage value as a detection voltage value to the main control circuit 101, where the first voltage value is determined based on the battery voltage value and the first preset voltage value;
The second protection control circuit 1042 is used for controlling the second protection control circuit 1042 to cut off when the output voltage value meets the conduction condition, and controlling the second protection control circuit 1042 to conduct when the output voltage value does not meet the conduction condition;
The third protection control circuit 1043 is configured to control the third protection control circuit 1043 to be turned on when the second protection control circuit 1042 is in a turned-on state, and output a second voltage value as a detection voltage value to the main control circuit 101, where the second voltage value is a voltage value of the negative electrode of the output terminal, and control the third protection control circuit 1043 to be turned off when the second protection control circuit 1042 is in a turned-off state.
Optionally, the preset conducting condition may specifically be that the output voltage value of the output terminal is 0V, or the output voltage value of the output terminal is smaller than the difference between the battery voltage value and the zener voltage value corresponding to the first protection control circuit 1041, which is not limited in the embodiment of the present application.
The first voltage value may be a difference between the battery voltage value and a first preset voltage value (e.g., 0.7V), which is not limited in the embodiment of the present application, and the second voltage value may be 0V, which is not limited in the embodiment of the present application.
Therefore, by arranging the three protection control circuits on the protection logic control circuit, whether the output voltage value meets the conduction condition is judged, and the first protection control circuit is selectively conducted under different judging results, or the second protection control circuit and the third protection control circuit are conducted, so that the main control circuit detects different detection voltage values based on different circuit conduction conditions, the circuit conduction control flexibility and the control efficiency of the protection logic control circuit are improved, corresponding detection voltage values under different conduction conditions are flexibly and efficiently output to the main control circuit, and the judgment accuracy and the judgment efficiency of the main control circuit on the current state of the battery use condition are improved.
In this alternative embodiment, optionally, as shown in fig. 2, the protection logic control circuit 104 may further include a clamp circuit 1044, where:
a first end of the clamp circuit 1044 is electrically connected to the third end of the main control circuit 101, and a second end of the clamp circuit 1044 is electrically connected to the third end of the first protection control circuit 1041 and the first end of the third protection control circuit 1043, respectively;
a clamp circuit 1044 for clamping the detection voltage value to the first voltage value or the second voltage value.
Alternatively, the clamping circuit 1044 may be specifically configured to pull up the detected voltage value to the first voltage value when the output voltage value meets the on condition, pull down the detected voltage value to the second voltage value when the output voltage value does not meet the on condition, and output the detected voltage value to the main control circuit 101.
Optionally, as shown in fig. 3, the clamping circuit 1044 may include a second resistor R15, where a first end of the second resistor R15 is electrically connected to the third end of the main control circuit 101, and a second end of the second resistor R15 is electrically connected to the third end of the first protection control circuit 1041 and the first end of the third protection control circuit 1043, respectively.
For example, when the output voltage value satisfies the on condition, the first protection control circuit 1041 is turned on, the second protection control circuit 1042 and the third protection control circuit 1043 are turned off, the second resistor R15 pulls up the detected voltage value to the first voltage value, and when the output voltage value does not satisfy the on condition, the first protection control circuit 1041 is turned off, the second protection control circuit 1042 and the third protection control circuit 1043 are turned on, and the second resistor R15 pulls down the detected voltage value to the second voltage value.
Therefore, by adding the clamping circuit into the protection logic control circuit, the output accuracy and the output stability of the detection voltage value can be improved, and the judgment accuracy of the main control circuit on the current state of the battery in use condition can be improved.
In this alternative embodiment, as shown in fig. 2, optionally, the first protection control circuit 1041 includes a first port protection module 10411, a first conduction control module 10412, and a voltage stabilizing module 10413, where:
The first end of the first port protection module 10411 is used for electrically connecting the positive electrode of the battery, the second end of the first port protection module 10411 is electrically connected with the first end of the first conduction control module 10412, the second end of the first conduction control module 10412 is electrically connected with the first end of the voltage stabilizing module 10413, the third end of the first conduction control module 10412 is electrically connected with the second end of the clamp circuit 1044 and the first end of the third protection control circuit 1043 respectively, and the second end of the voltage stabilizing module 10413 is electrically connected with the first end of the second protection control circuit 1042.
Optionally, fig. 4 is a schematic structural diagram of a protection logic control circuit according to an embodiment of the present application, as shown in fig. 4, the first port protection module 10411 may include a first diode D4, where an anode of the first diode D4 is used for electrically connecting with an anode of a battery, and a cathode of the first diode D4 is electrically connected with a first end of the first conduction control module 10412.
Optionally, as shown in fig. 4, the first on-control module 10412 may include a first switching device Q8, a third resistor R17, and a fourth resistor R16, where a first end of the first switching device Q8 is electrically connected to a second end of the first port protection module 10411 and a first end of the third resistor R17, a second end of the first switching device Q8 is electrically connected to a second end of the third resistor R17 and a first end of the voltage stabilizing module 10413, a third end of the first switching device Q8 is electrically connected to a first end of the fourth resistor R16, and a second end of the fourth resistor R16 is electrically connected to a second end of the clamp circuit 1044 and a first end of the third protection control circuit 1043, respectively.
Further alternatively, the first switching device Q8 may be a triode, or may be another electronic component capable of performing a conduction control function, and the embodiment of the present application is not limited, and further alternatively, the first switching device Q8 may be a PNP triode, and the embodiment of the present application is not limited, where when the first switching device Q8 is a triode, a first end of the first switching device Q8 may be an emitter, a second end of the first switching device Q8 may be a base, and a third end of the first switching device Q8 may be a collector.
Alternatively, as shown in fig. 4, the voltage regulator module 10413 may include a voltage regulator diode D6, where a cathode of the voltage regulator diode D6 is electrically connected to the second end of the first conductive control module 10412, and an anode of the voltage regulator diode D6 is electrically connected to the first end of the second protection control circuit 1042.
The zener voltage value corresponding to the first protection control circuit 1041 may be the zener voltage of the zener diode D6, which is not limited in the embodiment of the present application.
The first port protection module is arranged on the first protection control circuit, so that current can flow unidirectionally and the circuit is stabilized, circuit stability and circuit safety are improved, the first conduction control module is arranged on the first protection control circuit, control efficiency and control convenience for controlling the on/off state of the first protection control circuit can be improved, output accuracy of a detection voltage value of the protection logic control circuit is improved, judging accuracy of a main control circuit on the current state of a battery in use condition is improved, control accuracy of a battery anode on the charge and discharge state of the battery is improved, and the voltage stabilizing module is arranged on the first protection control circuit, so that the battery is still in a conduction state under the condition that other protection control circuits are conducted, self-power consumption of the battery is increased through resistance discharge, even 0V phenomenon occurs to a battery core is caused, and control accuracy of the first conduction control circuit and circuit safety are further improved.
In this alternative embodiment, optionally, as shown in fig. 2, the second protection control circuit 1042 may include a second port protection module 10421, a second conduction control module 10422, and a third port protection module 10423, where:
The first end of the second port protection module 10421 is used for electrically connecting the positive electrode of the output end, the second end of the second port protection module 10421 is electrically connected with the first end of the second conduction control module 10422, the second end of the second conduction control module 10422 is electrically connected with the first end of the third port protection module 10423 and the second end of the third protection control circuit 1043, the second end of the third port protection module 10423 is electrically connected with the second end of the first protection control circuit 1041, the third end of the second conduction control module 10422 is electrically connected with the second end of the third port protection module 10423, and the third end of the third port protection module 10423 and the fourth end of the third port protection module 10423 are electrically connected with the fourth end of the second protection control circuit 1042 and the negative electrode of the output end.
Optionally, as shown in fig. 4, the second port protection module 10421 may include a second diode D3, where a first end of the second diode D3 is electrically connected to the positive electrode of the output terminal, and a second end of the second diode D3 is electrically connected to the first end of the second conduction control module 10422.
Optionally, as shown in fig. 4, the second on-control module 10422 may include a second switching device Q9 and a fifth resistor R19, where a first end of the second switching device Q9 is electrically connected to a second end of the second port protection module 10421 and a first end of the fifth resistor R19, a second end of the second switching device Q9 is electrically connected to a second end of the fifth resistor R19 and a second end of the third port protection module 10423, and a third end of the second switching device Q9 is electrically connected to a first end of the third port protection module 10423 and a second end of the third protection control circuit 1043.
Further alternatively, the second switching device Q9 may be a triode, or may be another electronic component capable of performing a conduction control function, and the embodiment of the present application is not limited, further alternatively, the second switching device Q9 may be a PNP triode, and the embodiment of the present application is not limited, where when the second switching device Q9 is a triode, the first end of the second switching device Q9 may be an emitter, the second end of the second switching device Q9 may be a base, and the third end of the second switching device Q9 may be a collector.
Optionally, as shown in fig. 4, the third port protection module 10423 may include a third diode D5, a sixth resistor R21, and a seventh resistor R22, where an anode of the third diode D5 is electrically connected to the second end of the second conduction control module 10422 and the second end of the third protection control circuit 1043, a cathode of the third diode D5 is electrically connected to the second end of the first protection control circuit 1041 and the first end of the seventh resistor R22, a first end of the sixth resistor R21 is electrically connected to the third end of the second conduction control module 10422, and a second end of the sixth resistor R21 is electrically connected to the second end of the seventh resistor R22, the fourth end of the second protection control circuit 1042, and the cathode of the output end.
The second port protection module is arranged on the second protection control circuit, so that the unidirectional current flowing and stabilizing circuit can be guaranteed, the circuit stability and the circuit safety can be improved, the control efficiency and the control convenience for controlling the on/off state of the second protection control circuit can be improved, the control efficiency and the control convenience for controlling the on/off state of the third protection control circuit can be improved, the output accuracy of the detection voltage value of the protection logic control circuit can be improved, the judgment accuracy of the main control circuit on the current state of the battery in use condition can be improved, the control accuracy of the battery anode on the charge and discharge state of the battery can be improved, and the third port protection module is arranged on the second protection control circuit, so that the circuit stability and the circuit safety can be further improved.
In this alternative embodiment, the third protection control circuit 1043 includes a third conduction control module 10431 and a current limiting module 10432, where:
The first end of the third conduction control module 10431 is electrically connected to the second end of the clamp circuit 1044 and the third end of the first protection control circuit 1041, the second end of the third conduction control module 10431 is electrically connected to the first end of the current limiting module 10432, the second end of the current limiting module 10432 is electrically connected to the second end of the second protection control circuit 1042, and the third end of the third conduction control module 10431 is electrically connected to the third end of the third protection control circuit 1043 and the negative electrode of the output end.
Optionally, as shown in fig. 4, the third on-control module 10431 may include a third switching device Q7 and an eighth resistor R18, where a first end of the third switching device Q7 is electrically connected to a second end of the clamp circuit 1044 and a third end of the first protection control circuit 1041, a second end of the third switching device Q7 is electrically connected to a first end of the eighth resistor R18 and a first end of the current limiting module 10432, and a third end of the third switching device Q7 is used for electrically connecting a second end of the eighth resistor R18, a third end of the third protection control circuit 1043 and an output terminal negative electrode.
Further alternatively, the third switching device Q7 may be a triode, or may be another electronic component capable of performing a conduction control function, and the embodiment of the present application is not limited, further alternatively, the third switching device Q7 may be an NPN triode, and the embodiment of the present application is not limited, where when the third switching device Q7 is a triode, the first end of the third switching device Q7 may be a collector, the second end of the third switching device Q7 may be a base, and the third end of the third switching device Q7 may be an emitter.
Optionally, as shown in fig. 4, the current limiting module 10432 may include a ninth resistor R20, where a first end of the ninth resistor R20 is electrically connected to the second end of the third conductive control module 10431, and a second end of the ninth resistor R20 is electrically connected to the second end of the second protection control circuit 1042.
Therefore, the control efficiency and the control convenience for controlling the on/off state of the third protection control circuit can be improved by arranging the third conduction control module in the third protection control circuit, the output accuracy of the detection voltage value of the protection logic control circuit is improved, the judgment accuracy of the main control circuit on the current state of the battery in use condition is improved, the control accuracy of the battery anode on the charge and discharge state of the battery is improved, and the current limiting module is arranged in the third protection control circuit, so that the signal input to the third protection control circuit in the on state of the second protection control module plays a role of current limiting, the third conduction control module is protected to be used normally, and the circuit stability and the circuit safety are further improved.
In yet another alternative embodiment, as shown in fig. 2, optionally, the charge-discharge circuit 103 includes a discharge control module 1031 and a charge control module 1032, wherein:
The first end of the discharging control module 1031 is electrically connected with the third end of the driving circuit 102, the first end of the charging control module 1032 is electrically connected with the fourth end of the driving circuit 102, the second end of the discharging control module 1031 is electrically connected with the second end of the charging control module 1032, the third end of the discharging control module 1031 and the fifth end of the driving circuit 102 are respectively used for being electrically connected with the positive electrode of the battery, and the third end of the charging control module 1032 and the sixth end of the driving circuit 102 are respectively used for being electrically connected with the positive electrode of the output end;
The discharging control module 1031 is configured to control the battery to discharge to the load when the driving signal controls the discharging control module 1031 to be turned on;
The charging control module 1032 is configured to control the power supply to charge the battery when the driving signal controls the charging control module 1032 to be turned on.
Alternatively, as shown in fig. 3, the discharging control module 1031 may include a discharging MOS transistor, where a first end of the discharging MOS transistor is electrically connected to a third end of the driving circuit 102, a second end of the discharging MOS transistor is electrically connected to a second end of the charging control module 1032, and the third end of the discharging MOS transistor is electrically connected to an anode of the battery.
Further alternatively, the discharge MOS transistor may be a PMOS, and when the discharge MOS transistor is a PMOS, the first end of the discharge MOS transistor may be a gate (G), the second end of the discharge MOS transistor may be a drain (D), and the third end of the discharge MOS transistor may be a source (S).
Alternatively, as shown in fig. 3, the charge control module 1032 may include a charge MOS transistor, where a first end of the charge MOS transistor is electrically connected to the fourth end of the driving circuit 102, a second end of the charge MOS transistor is electrically connected to the second end of the discharge control module 1031, and a third end of the charge MOS transistor is electrically connected to the positive electrode of the output terminal.
Further alternatively, the charging MOS transistor may be a PMOS, and when the charging MOS transistor is a PMOS, the first end of the charging MOS transistor may be a gate (G), the second end of the charging MOS transistor may be a drain (D), and the third end of the charging MOS transistor may be a source (S).
Therefore, the charging control module and the discharging control module are arranged in the charging and discharging circuit, so that the driving signals can flexibly and accurately control the on/off of the two modules, the control flexibility and the control accuracy of whether the battery can be charged/discharged can be improved, the battery protection efficiency and the protection reliability are improved, and further the use safety of the battery is further improved.
The working principle of the protection circuit applied to the battery anode in the embodiment of the application is as follows:
Taking fig. 4 as an example to illustrate the working principle of the application, the battery anode protection scheme of the application adopts an anode protection IC, builds a charging PMOS/discharging PMOS in a driving circuit control main loop, and is provided with a protection logic control circuit to realize the protection state release function. Wherein, under the different states of battery, the control logic of protection logic control is as follows:
(1) Primary power-on state:
In the protection logic control circuit, the triodes Q9 and Q7 are in a cut-off state, the triode Q8 is in a conducting state, the VM is pulled up to the positive pole B+ of the battery through a resistor, V VM=VBAT-0.7V＞VLD(VBAT is the battery voltage, and V LD is the load detection voltage;
(2) Charge activated state:
In the protection logic control circuit, the triodes Q9 and Q7 are switched from the off state to the on state, in order to avoid that the triodes Q8 are still in the on state, so that the battery increases the self-power consumption through resistance discharge and even causes the phenomenon of 0V to occur in a battery core, a zener diode D6 is introduced into the circuit, when V OUT＜VBAT-VZ (V Z is the zener voltage of the zener diode), the triodes Q8 are in the on state, the triodes Q8 are switched from the on state to the off state due to the existence of the zener diode D6, the VM is pulled down to P-, V VM=0V＜VCHG_RM(VCHG_RM is the charger to remove the detection voltage, the negative protection IC considers that the output end is connected with the charger, and the discharge MOS is controlled to be switched from the off state to the on state;
(3) Overcharge protection state:
When the overcharge protection is triggered, the negative electrode protection IC controls the charge MOS to be switched from a conducting state to a closing state, after the overcharge protection is carried out, the voltage of an output end P+ and P-still exists, V OUT=VBAT-VSD(VSD is the voltage drop of a body diode of the MOS), at the moment, the triodes Q9 and Q7 in the protection logic control circuit are in the conducting state, due to the existence of the zener diode D6, the triode Q8 is in the cutting-off state, VM is pulled down to P-, V VM=0V＜VCHG_RM, the negative electrode protection IC considers that the output end is connected with a charger at the moment, the overcharge protection releasing condition is not met, and the voltage of a battery core is required to be reduced through discharging until the voltage is smaller than the overcharge releasing voltage, so that the battery core can be restored;
(4) Over-discharge protection state:
When overdischarge protection is triggered, a negative electrode protection IC controls a discharge MOS to be turned from an on state to an off state, after the overdischarge protection is carried out, an output end P+ and P-have no voltage, V OUT = 0V, a triode Q9 and a triode Q7 in a protection logic control circuit are in an off state, a triode Q8 is in an on state, a VM is pulled up to B+ and V VM=VBAT-0.7V＞VLD through a resistor, the negative electrode protection IC considers that the output end is connected with a load and does not meet the overdischarge protection release condition, a charger is connected in the overdischarge protection state, V OUT=VBAT+VSD is connected, the triode Q9 and the triode Q7 are turned from the off state to the on state, the triode Q8 is turned from the on state to the off state, the VM is pulled down to P-, V VM=0V＜VCHG_RM, the negative electrode protection IC considers that the output end is connected with the charger and meets the overdischarge protection release condition, and the discharge MOS is controlled to be turned from the off state to the on state;
(5) Discharge overcurrent protection state:
When the discharge overcurrent protection is triggered, the negative electrode protection IC controls the discharge MOS to be turned from a conducting state to a closing state, after the discharge overcurrent protection state is entered, the output ends P+ and P-have no voltage, V OUT = 0V, the triodes Q9 and Q7 in the protection logic control circuit are in a cut-off state, the triode Q8 is in a conducting state, the VM is pulled up to B+ and V VM=VBAT-0.7V＞VLD through a resistor, the negative electrode protection IC considers that the output end is connected with a load and does not meet the discharge overcurrent protection release condition, a charger is connected in the discharge overcurrent protection state, V OUT=VBAT+VSD is connected, the triodes Q9 and Q7 are turned from the cut-off state to the conducting state, the VM is pulled down to P-, V VM=0V＜VLD, the negative electrode protection IC considers that the output end is not connected with the load, the discharge overcurrent protection release condition is met, and the discharge MOS is controlled to be turned from the closing state to the conducting state;
(6) Charging overcurrent protection state:
When the charging overcurrent protection is triggered, the negative electrode protection IC controls the charging MOS and the discharging MOS to be turned from the on state to the off state, when the charger is not pulled out, the output ends P+ and P-have voltages V OUT=VMAX, the triodes Q9 and Q7 in the protection logic control circuit are in the on state, the triode Q8 is in the off state, the VM is pulled down to P-, V VM=0V＜VCHG_RM, the negative electrode protection IC considers that the output end is connected with the charger and does not accord with the charging overcurrent protection releasing condition, when the charger is pulled out, the output ends P+ and P-have no voltage, V OUT =0V, the triodes Q9 and Q7 are turned from the on state to the off state, the triode Q8 is turned from the off state to the on state, the VM is pulled up to B+ and V VM=VBAT-0.7V＞VCHG_RM, and the negative electrode protection IC considers that the output end is not connected with the charger and accords with the charging overcurrent protection releasing condition, and controls the charging MOS and the discharging MOS to be turned from the off state to the on state;
(7) Reverse connection protection state of charger:
When the protection function is not triggered and the protection function is in a normal working state, the output end P+ and P-have voltage, V OUT=VBAT, at the moment, the triodes Q9 and Q7 in the protection logic control circuit are in an on state, the triodes Q8 are in an off state, VM is pulled down to P-, V VM =0V through the resistor, the charger reversely triggers the discharge overcurrent protection function, after the protection function enters the discharge overcurrent protection state, the output end voltage V OUT=-VMAX, at the moment, the triodes Q9 and Q7 are in an off state, the triodes Q8 are in an on state, VM is pulled up to B+ and V VM=VBAT-0.7V＞VLD through the resistor, the negative electrode protection IC considers that the output end is connected with a load and does not meet the discharge overcurrent protection release condition, at the moment, the output end voltage V OUT =0V is pulled up when the charger is pulled out, at the moment, the triodes Q9, Q7 and Q8 are unchanged, VM is still pulled up to B+ and V VM=VBAT-0.7V＞VLD through the resistor, the negative electrode protection IC considers that the output end is connected with the load and does not meet the discharge overcurrent protection release condition, at the moment, when the connection of the output end is correctly, the output end voltage V OUT=VMAX is reached, the triodes Q9 and Q7 is switched from the off state to the off state, the output end Q8 is switched to the discharge overcurrent protection condition is switched from the negative electrode state to the on state, and the MOS is switched to the state is not met, and the discharge protection condition is switched to be switched to the off.
Example two
Referring to fig. 5, fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application, which includes a protection circuit applied to a positive electrode of a battery according to any one of the first embodiment. And the functions that can be implemented by the electronic device include, but are not limited to, being able to determine whether the current state of the battery needs protection based on the battery voltage and the output port voltage, so as to control the battery charge/discharge at the battery anode. It should be noted that, for the detailed description of the protection circuit applied to the positive electrode of the battery, please refer to the detailed description of the related contents in the first embodiment, and the detailed description is omitted.
As can be seen, the electronic device illustrated in fig. 5 can control the plurality of protection control circuits in the protection logic control circuit to be in on/off states respectively according to the battery voltage value of the battery and the output voltage value of the output terminal by the protection logic control circuit, so as to output the detection voltage value to the main control circuit; the method comprises the steps of detecting a detection voltage value output by a protection logic control circuit through a main control circuit, determining the current state of a battery according to the detection voltage value, outputting a control signal corresponding to the current state to a driving circuit according to the current state, generating a driving signal corresponding to the control signal through the driving circuit according to the received control signal, outputting the driving signal to a charge-discharge circuit, controlling the charge-discharge circuit to be conducted or cut off based on the received driving signal through the charge-discharge circuit, controlling the battery to discharge to a load or controlling a power supply to charge the battery when the charge-discharge circuit is conducted, controlling the on/off of the protection logic control circuit based on the battery voltage and the output port voltage, judging whether the current state of the battery needs to be protected or not according to the detection voltage values in different on/off states of the protection logic control circuit, and controlling whether the battery can be charged or discharged when the battery is in an activated state or in a protected state or in need of being relieved, so as to effectively protect the positive electrode of the battery, thereby improving the protection timeliness of the battery and the timeliness of the battery protection, further improving the reliability of the battery protection, being beneficial to stopping the battery in case of safety risk and stopping the battery in time and allowing the battery to be reused in case of safety risk, after the control signal output by the main control circuit is processed by the driving circuit, a more stable and accurate driving signal is output to the charging and discharging circuit, so that the signal output accuracy and the output stability can be improved, the driving reliability and the control reliability of the charging and discharging circuit are improved, the control reliability of whether the battery can be charged and discharged at the positive electrode of the battery is further improved, the protection timeliness and the release protection timeliness of the battery are further improved, and the reliability of the battery protection is further improved.
The foregoing describes in detail a protection circuit and an electronic device for a battery positive electrode, which are disclosed in the embodiments of the present application, and the specific embodiments are used herein to illustrate the principles and implementation of the present application, but the above preferred embodiments are not intended to limit the present application, and the above description of the embodiments is only for helping to understand the method and core idea of the present application, and meanwhile, according to the idea of the present application, those skilled in the art will change in the specific embodiments and application scope without departing from the spirit and scope of the present application, so that the protection scope of the present application is defined by the scope of the claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202422902448.4U CN223613065U (en) | 2024-11-26 | 2024-11-26 | A protection circuit and electronic device applied to the positive terminal of a battery. |
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| CN202422902448.4U CN223613065U (en) | 2024-11-26 | 2024-11-26 | A protection circuit and electronic device applied to the positive terminal of a battery. |
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