Protection circuit applied to positive electrode of battery and electronic equipment

Abstract

The utility model relates to the technical field of battery protection, and discloses a protection circuit applied to a battery positive electrode and electronic equipment, the circuit comprises a main control circuit, a driving circuit, a charging and discharging circuit and protection logic control circuits, the protection logic control circuits are used for respectively controlling a plurality of protection control circuits to be switched on / off according to a battery voltage and an output voltage, so that the battery positive electrode is protected. The detection voltage is output to the main control circuit, the current state of the battery is determined through the main control circuit according to the detection voltage, and a control signal corresponding to the current state is output to the driving circuit; generating a driving signal corresponding to the control signal through a driving circuit, and outputting the driving signal to a charging and discharging circuit; the charging and discharging circuit controls the charging and discharging circuit to be switched on or switched off based on the driving signal so as to control charging / discharging of the battery. It can be seen that whether the current state of the battery needs to be protected or not can be judged based on the battery voltage and the output port voltage, battery charging and discharging are controlled at the positive electrode of the battery, and battery protection reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery protection, in particular to a protection circuit applied to a positive electrode of a battery and an electronic device. BACKGROUND

[0002] In the existing BMS (Battery Management System), a battery protection circuit is usually arranged to improve the use safety of the battery.

[0003] In the prior art, the battery protection circuit of the BMS usually adopts a negative electrode protection scheme. However, the negative electrode protection scheme adopts a negative electrode protection IC (Integrated Circuit), and since the system end takes the output end negative electrode P- as the reference ground, after the negative electrode protection scheme enters the protection state, the system end reference ground is in a suspended state relative to the GND (Ground) of the BMS, which easily leads to the decrease of the circuit stability, thereby leading to the decrease of the use safety of the battery.

[0004] Therefore, it is particularly important to provide a technical scheme capable of improving the reliability of battery protection, thereby improving the use safety of the battery. CONTENT OF THE INVENTION

[0005] The present application provides a protection circuit applied to a positive electrode of a battery and an electronic device, which can improve the reliability of battery protection, thereby improving the use safety of the battery.

[0006] In order to solve the above technical problem, the present application discloses a protection circuit applied to a positive electrode of a battery in the first aspect, which comprises a main control circuit, a driving circuit, a charge-discharge circuit and a protection logic control circuit, wherein:

[0007] 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 negative electrode of the battery and grounding; the third end of the driving circuit is electrically connected with the first end of the charge-discharge circuit, and the fourth end of the driving circuit is electrically connected with the second end of the charge-discharge circuit;

[0008] 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 electrically connecting the positive electrode 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 electrically connecting the positive electrode of the output end; the sixth end of the main control circuit and the fourth end of the protection logic control circuit are used for electrically connecting the negative electrode of the output end;

[0009] The protection logic control circuit is configured to output a detection voltage value to the main control circuit according to a battery voltage value of the battery and an output voltage value of the output terminal;

[0010] The main control circuit is configured to determine a current state of the battery according to the detection voltage value, and output a control signal corresponding to the current state to the drive circuit;

[0011] The drive circuit is configured to output a drive signal to the charge-discharge circuit according to the control signal, and control the charge-discharge circuit to be turned on or turned off.

[0012] As an optional implementation, in the first aspect of the application, the main control circuit comprises a control chip and a chip protection module, wherein:

[0013] A first end of the control chip is electrically connected with a first end of the drive circuit, a second end of the control chip is electrically connected with a second end of the drive circuit, a third end of the control chip is electrically connected with a first end of the protection logic control circuit, a fourth end of the control chip is configured to be electrically connected with a positive electrode of the battery, a fifth end of the control chip is configured to be electrically connected with a first end of the chip protection module, a negative electrode of the battery and a ground, respectively, and a sixth end of the control chip is configured to be electrically connected with a second end of the chip protection module and a negative electrode of the output terminal.

[0014] As an optional implementation, in the first aspect of the application, the protection logic control circuit comprises a first protection control circuit, a second protection control circuit and a third protection control circuit, wherein:

[0015] A first end of the first protection control circuit is configured to be electrically connected with a positive electrode of the battery, a second end of the first protection control circuit is electrically connected with a first end of the second protection control circuit, a third end of the first protection control circuit is electrically connected with a first end of the third protection control circuit and a third end of the main control circuit, respectively; a second end of the second protection control circuit is electrically connected with a second end of the third protection control circuit; a third end of the second protection control circuit is configured to be electrically connected with a positive electrode of the output terminal; a fourth end of the second protection control circuit and a third end of the third protection control circuit are configured to be electrically connected with a negative electrode of the output terminal, respectively;

[0016] The first protection control circuit is configured to output a first voltage value as the detection voltage value to the main control circuit when an output voltage value of the output terminal meets a preset turn-on condition.

[0017] The second protection control circuit is configured to control the third protection control circuit to be turned on when the output voltage value does not satisfy the turn-on condition, so as to output a second voltage value as the detection voltage value to the master control circuit.

[0018] As an optional implementation, in the first aspect of the present application, the protection logic control circuit further comprises a clamping circuit, wherein:

[0019] The first end of the clamping circuit is electrically connected to the third end of the master control circuit, and the second end of the clamping circuit is electrically connected to the third end of the first protection control circuit and the first end of the third protection control circuit respectively.

[0020] The clamping circuit is configured to clamp the detection voltage value at the first voltage value or the second voltage value.

[0021] As an optional implementation, in the first aspect of the present application, the first protection control circuit comprises a first port protection module, a first turn-on control module and a voltage stabilizing module, wherein:

[0022] The first end of the first port protection module is configured to be electrically connected to the positive electrode of the battery, the second end of the first port protection module is electrically connected to the first end of the first turn-on control module, the second end of the first turn-on control module is electrically connected to the first end of the voltage stabilizing module, the third end of the first turn-on control module is electrically connected to 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 to the first end of the second protection control circuit.

[0023] As an optional implementation, in the first aspect of the present application, the first port protection module comprises a first diode, wherein the positive electrode of the first diode is configured to be electrically connected to the positive electrode of the battery, and the negative electrode of the first diode is electrically connected to the first end of the first turn-on control module.

[0024] The first turn-on 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 to 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 to 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 to the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the second end of the clamping circuit and the first end of the third protection control circuit respectively.

[0025] The voltage stabilizing module comprises a voltage stabilizing diode, wherein: a negative electrode of the voltage stabilizing diode is electrically connected with a second end of the first conduction control module, and a positive electrode of the voltage stabilizing diode is electrically connected with a first end of the second protection control circuit.

[0026] As an optional implementation, in the first aspect of the application, the second protection control circuit comprises a second port protection module, a second conduction control module and a third port protection module, wherein:

[0027] The first end of the second port protection module is used for electrically connecting 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 respectively electrically connected with the first end of the third port protection module and the second end of the third protection control circuit; 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; the third end of the third port protection module and the fourth end of the third port protection module are respectively used for electrically connecting the fourth end of the second protection control circuit and the negative electrode of the output end.

[0028] As an optional implementation, in the first aspect of the application, the third protection control circuit comprises a third conduction control module and a current limiting module, wherein:

[0029] The first end of the third conduction control module is respectively electrically connected with the second end of the clamping circuit and the third end of the first protection control circuit, 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.

[0030] As an optional implementation, in the first aspect of the application, the charging and discharging circuit comprises a discharging control module and a charging control module, wherein:

[0031] 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, the third end of the discharging control module and the fifth end of the driving circuit are respectively used for electrically connecting the positive electrode of the battery; the third end of the charging control module and the sixth end of the driving circuit are respectively used for electrically connecting the positive electrode of the output end;

[0032] The discharge control module is configured to control the battery to discharge to a load when the drive signal controls the discharge control module to be turned on.

[0033] The charge control module is configured to control the power supply to charge the battery when the drive signal controls the charge control module to be turned on.

[0034] The second aspect of the present application discloses an electronic device, which comprises a device body and the protection circuit applied to the positive electrode of the battery according to any one of the first aspect.

[0035] Compared with the prior art, the present application has the following beneficial effects:

[0036] The implementation of the present application can control the multiple protection control circuits in the protection logic control circuit to be in the on state / off state respectively to output a detection voltage value to the master control circuit according to the battery voltage value and the output voltage value of the output terminal through the protection logic control circuit; detect the detection voltage value output by the protection logic control circuit through the master control circuit; determine the current state of the battery according to the detection voltage value; output a control signal corresponding to the current state to the driving circuit according to the current state; generate a driving signal corresponding to the control signal received by the driving circuit and output the driving signal to the charge-discharge circuit through the driving circuit according to the control signal received; control the charge-discharge circuit to be turned on or turned off based on the driving signal received through the charge-discharge circuit; control the battery to discharge to a load or control the power supply to charge the battery when the charge-discharge circuit is turned on, which can control the on / off of the protection logic control circuit based on the battery voltage and the output terminal voltage, thereby determining whether the current state of the battery needs protection according to the detection voltage value in different on / off states of the protection logic control circuit, improving the accuracy of determining whether the battery is in an activated state or in a protection state or needs to be released from protection, and controlling whether the battery can be charged or discharged at the positive electrode of the battery to efficiently protect the positive electrode of the battery, thereby improving the protection timeliness and release timeliness of the battery, further improving the reliability of battery protection, which is conducive to stopping using the battery in time in the presence of a safety risk and allowing the battery to be used in time after the safety risk is released, thereby improving the safety of the battery in use; and outputting a more stable and accurate driving signal to the charge-discharge circuit after the driving circuit processes the control signal output by the master control circuit, which can improve the signal output accuracy and stability, thereby improving the driving reliability and control reliability of the charge-discharge circuit, further improving the control reliability of whether the battery can be charged or discharged at the positive electrode of the battery, and further improving the protection timeliness and release timeliness of the battery, thereby improving the reliability of battery protection. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0038] Figure 1 is a structural schematic diagram of a protection circuit applied to a positive electrode of a battery according to an embodiment of the present application;

[0039] Figure 2 is a structural schematic diagram of another protection circuit applied to a positive electrode of a battery according to an embodiment of the present application;

[0040] Figure 3 is a structural schematic diagram of still another protection circuit applied to a positive electrode of a battery according to an embodiment of the present application;

[0041] Figure 4 is a structural schematic diagram of a protection logic control circuit according to an embodiment of the present application;

[0042] Figure 5 is a structural schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0044] It should be noted that, unless otherwise explicitly specified and limited, the term “electrically connected” in the specification and claims of the present application and the above drawings should be understood broadly, for example, it can be a fixed electrically connected, or a detachable electrically connected, or an integrally electrically connected; it can be a mechanical electrically connected, or an electrical electrically connected, or it can be in communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. In addition, the terms “first”, “second” and the like in the specification and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order, and the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusion. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] Embodiment one

[0046] Please refer to Figure 1 , Figure 1 is a structure diagram of a protection circuit applied to a positive electrode of a battery. The circuit can be applied to a circuit using a battery for charging / discharging, or can be applied to a BMS (Battery Management System), and the embodiments of the present application are not limited. As shown in Figure 1 , the protection circuit applied to the positive electrode of the battery can include a master control circuit 101, a driving circuit 102, a charging / discharging circuit 103, and a protection logic control circuit 104, wherein:

[0047] The first end of the master control circuit 101 is electrically connected to the first end of the driving circuit 102, the second end of the master control circuit 101 is electrically connected to the second end of the driving circuit 102, the third end of the master control circuit 101 is electrically connected to the first end of the protection logic control circuit 104, and the fourth end of the master control circuit 101 is used to electrically connect the negative electrode of the battery and ground. The third end of the driving circuit 102 is electrically connected to the first end of the charging / discharging circuit 103, and the fourth end of the driving circuit 102 is electrically connected to the second end of the charging / discharging circuit 103;

[0048] The fifth end of the master control circuit 101, the fifth end of the driving circuit 102, the third end of the charging / discharging circuit 103, and the second end of the protection logic control circuit 104 are respectively used to electrically connect the positive electrode of the battery; the sixth end of the driving circuit 102, the fourth end of the charging / discharging circuit 103, and the third end of the protection logic control circuit 104 are respectively used to electrically connect the positive electrode of the output end; the sixth end of the master control circuit 101 and the fourth end of the protection logic control circuit 104 are used to electrically connect the negative electrode of the output end;

[0049] The protection logic control circuit 104 is used to output a detection voltage value to the master control circuit 101 according to the battery voltage value of the battery and the output voltage value of the output end;

[0050] The master control circuit 101 is used to determine the current state of the battery according to the detection voltage value, and output a control signal corresponding to the current state to the driving circuit 102;

[0051] The driving circuit 102 is used to output a driving signal to the charging / discharging circuit 103 according to the control signal, so as to control the charging / discharging circuit 103 to be turned on or turned off.

[0052] Optionally, the above description of the master control circuit 101, the driving circuit 102, the charging / discharging circuit 103, and the protection logic control circuit 104 can be specifically:

[0053] The protection logic control circuit 104 is configured to control a plurality of protection control circuits in the protection logic control circuit 104 to be in a conducting state or a non-conducting state according to the battery voltage value and the output voltage value, so as to output a detection voltage value to the main control circuit 101;

[0054] The main control circuit 101 is configured to detect the detection voltage value output by the protection logic control circuit 104, determine a current state of the battery according to the detection voltage value, and output a control signal corresponding to the current state to the driving circuit 102 according to the current state, wherein the current state includes at least one of a battery connection state, an activation state, a protection state and a protection release state.

[0055] The driving circuit 102 is configured to generate a driving signal corresponding to the received control signal and output the driving signal to the charge-discharge circuit 103 according to the received control signal.

[0056] The charge-discharge circuit 103 is configured to control the charge-discharge circuit 103 to be in a conducting state or a non-conducting state according to the received driving signal, and control the battery to discharge to a load or control the power supply to charge the battery when the charge-discharge circuit 103 is in the conducting state.

[0057] Optionally, the battery connection state can include a load connection state or a charger connection state, the activation state can include a first power-on state or a charging activation state, the protection state can include one of an overcharge protection state, an overdischarge protection state, a discharge overcurrent protection state, a charging overcurrent protection state and a charger reverse connection protection state, and the protection release state can be a normal working state recovered from any one of the above protection states, which is not limited in the embodiments of the application.

[0058] Optionally, the battery connection state can include a load connection state or a charger connection state, the activation state can include a first power-on state or a charging activation state, the protection state can include one of an overcharge protection state, an overdischarge protection state, a discharge overcurrent protection state, a charging overcurrent protection state and a charger reverse connection protection state, and the protection release state can be a normal working state recovered from any one of the above protection states, which is not limited in the embodiments of the application. Figure 3 is another structure diagram of a protection circuit applied to a positive electrode of a battery, as shown in Figure 3 The positive electrode of the battery can be B+ as shown in Figure 3 The positive electrode of the output terminal can be P+ as shown in Figure 3 The negative electrode of the output terminal can be P- as shown in Figure 3

[0059] ​It can be seen that the embodiment of the application can control the multiple protection control circuits in the protection logic control circuit to be in the on state / off state respectively to output the detection voltage value to the master control circuit according to the battery voltage value and the output voltage value of the output end through the protection logic control circuit; detect the detection voltage value output by the protection logic control circuit through the master control circuit; determine the current state of the battery according to the detection voltage value; output the control signal corresponding to the current state to the driving circuit according to the current state; wherein the current state includes at least one of the battery connection state, the activation state, the protection state and the deprotection state; control the charging and discharging circuit to be on or off through the driving circuit according to the received control signal; when the charging and discharging circuit is on, control the battery to discharge to the load or control the power supply to charge the battery, which can control the on / off of the protection logic control circuit based on the battery voltage and the output port voltage, so as to determine whether the battery needs protection in the different on / off states of the protection logic control circuit through the detection voltage value, improve the accuracy of determining whether the battery is in the activation state or in the protection state or needs to be deprotected, and control whether the battery can charge and discharge through the positive electrode of the battery, so as to efficiently protect the positive electrode of the battery, improve the protection and deprotection timeliness of the battery, and further improve the reliability of battery protection, which is beneficial to stop using the battery in time in the case of safety risk and allow using the battery in time in the case of deprotection, and further improve the use safety of the battery.

[0060] In an optional embodiment, Figure 2 is another application structure diagram of the protection circuit for the positive electrode of the battery disclosed by the embodiment of the application, as Figure 2 The master control circuit 101 can include a control chip 1011 and a chip protection module 1012, wherein:

[0061] 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 the positive electrode of the battery, the fifth end of the control chip 1011 is used for electrically connecting the first end of the chip protection module 1012, the negative electrode of the battery and the ground respectively, and the sixth end of the control chip 1011 is used for electrically connecting the second end of the chip protection module 1012 and the negative electrode of the output end respectively.

[0062] Optionally, the master control circuit 101 determines the current state of the battery according to the detection voltage value, which can specifically be that the control chip 1011 can compare the detection voltage value with the 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.

[0063] The preset voltage value set can include at least one preset detection voltage value. Optionally, the preset detection voltage value can be one of a preset load detection voltage value, a preset charger removal detection voltage, and a preset full battery charging voltage value, and the embodiments of the application are not limited in this regard.

[0064] It can be seen that the state determination and control signal output functions of the main control circuit are realized by the control chip and the chip protection module. The battery state is determined by the pre-set determination logic of the control chip and the preset voltage value set, which can improve the determination efficiency and accuracy of the battery state and the output accuracy of the control signal, thereby improving the on / off control accuracy of the charging / discharging circuit, and further improving the control efficiency and accuracy of the battery charging / discharging controlled by the positive electrode of the battery, and further improving the protection timeliness and the protection release timeliness of the battery. In addition, the use safety of the control chip can be improved by setting the chip protection module.

[0065] Optionally, as shown in Figure 3 The control chip 1011 can be a negative electrode protection IC (Integrated Circuit), and the chip protection module 1012 can include a first resistor R1, wherein:

[0066] The first end of the negative electrode protection IC is electrically connected to the first end of the driving circuit 102, the second end of the negative electrode protection IC is electrically connected to the second end of the driving circuit 102, the third end of the negative electrode protection IC is electrically connected to the first end of the protection logic control circuit 104, the fourth end of the negative electrode protection IC is used to electrically connect the positive electrode of the battery, the fifth end of the negative electrode protection IC is used to electrically connect the first end of the first resistor R1, the negative electrode of the battery and the ground, respectively, and the sixth end of the negative electrode protection IC is used to electrically connect the second end and the output negative electrode of the first resistor R1, respectively.

[0067] It should be noted that in the case of using a negative electrode protection IC in the protection scheme (as shown in Figure 3 The driving circuit is used to control the PMOS in the main loop. However, in this scheme, after entering the protection state, the GND of the BMS is directly connected to the output negative electrode P-, and the negative electrode protection IC cannot realize the protection state release function by detecting the voltage of the output negative electrode P-. Therefore, a protection logic control circuit is needed to realize the protection state release function.

[0068] It can be seen that by selecting the negative electrode protection IC as the control chip, compared with the prior art, the system ground can be avoided to be suspended or raised (that is, the voltage difference between the system ground and the GND of the BMS is avoided) when the charging and discharging circuit is cut off, and compared with the selection of the positive electrode protection IC, the model selection range of the control chip can be expanded, the selection flexibility of the control chip can be improved, and the research and development cost of the battery protection scheme can be reduced; and by selecting the resistor as the chip protection module, the use protection cost of the chip can be reduced, and the use safety of the chip can be improved.

[0069] In another optional embodiment, as shown in Figure 2 The protection logic control circuit 104 can include a first protection control circuit 1041, a second protection control circuit 1042, and a third protection control circuit 1043, wherein:

[0070] The first end of the first protection control circuit 1041 is electrically connected to the positive electrode of the battery, the second end of the first protection control circuit 1041 is electrically connected to the first end of the second protection control circuit 1042, the third end of the first protection control circuit 1041 is respectively electrically connected to 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 to the second end of the third protection control circuit 1043; the third end of the second protection control circuit 1042 is electrically connected to 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 electrically connected to the negative electrode of the output end.

[0071] The first protection control circuit 1041 is configured to output a first voltage value as a detection voltage value to the main control circuit 101 when the output voltage value of the output end meets a preset conduction condition.

[0072] The second protection control circuit 1042 is configured to control the third protection control circuit 1043 to conduct when the output voltage value does not meet the conduction condition, so as to output a second voltage value as a detection voltage value to the main control circuit 101.

[0073] Optionally, the above description of the first protection control circuit 1041, the second protection control circuit 1042, and the third protection control circuit 1043 can be specifically as follows:

[0074] The first protection control circuit 1041 is configured to control the first protection control circuit 1041 to conduct and output a first voltage value as a detection voltage value to the main control circuit 101 when the output voltage value of the output end meets a preset conduction condition, wherein the first voltage value is determined based on a battery voltage value and a first preset voltage value; and the first protection control circuit 1041 is cut off when the output voltage value does not meet the conduction condition.

[0075] The second protection control circuit 1042 is configured to control the second protection control circuit 1042 to be turned off when the output voltage value meets the turn-on condition, and control the second protection control circuit 1042 to be turned on when the output voltage value does not meet the turn-on condition.

[0076] The third protection control circuit 1043 is configured to control the third protection control circuit 1043 to be turned on and output the second voltage value as the detection voltage value to the main control circuit 101 when the second protection control circuit 1042 is in the turn-on state, where the second voltage value is the 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 the turn-off state.

[0077] Optionally, the preset turn-on condition can be specifically that the output voltage value of the output terminal is 0V, or the output voltage value of the output terminal is less than the difference between the battery voltage value and the zener voltage value corresponding to the first protection control circuit 1041, and the embodiments of the present application are not limited thereto.

[0078] For example, the first voltage value can be the difference between the battery voltage value and the first preset voltage value (for example, 0.7V), and the embodiments of the present application are not limited thereto; and the second voltage value can be 0V, and the embodiments of the present application are not limited thereto.

[0079] It can be seen that by setting three protection control circuits in the protection logic control circuit, it is determined whether the output voltage value meets the turn-on condition, and the first protection control circuit is turned on or the second protection control circuit and the third protection control circuit are turned on under different determination results, so that the main control circuit detects different detection voltage values based on different circuit turn-on conditions, thereby improving the circuit turn-on control flexibility and control efficiency of the protection logic control circuit, flexibly and efficiently outputting the corresponding detection voltage values in different turn-on conditions to the main control circuit, and further improving the determination accuracy and determination efficiency of the main control circuit for the current state of the battery usage condition.

[0080] In this optional embodiment, as shown in Figure 2 The protection logic control circuit 104 can further include a clamping circuit 1044, where:

[0081] The first end of the clamping circuit 1044 is electrically connected to the third end of the main control circuit 101, and the second end of the clamping 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.

[0082] The clamping circuit 1044 is configured to clamp the detection voltage value at the first voltage value or the second voltage value.

[0083] Optionally, the clamping circuit 1044 can be specifically configured to pull up the detection voltage value to the first voltage value when the output voltage value meets the turn-on condition, and pull down the detection voltage value to the second voltage value when the output voltage value does not meet the turn-on condition; and output the detection voltage value to the main control circuit 101.

[0084] Optionally, as shown in Figure 3 the clamping circuit 1044 can include a second resistor R15, wherein a first end of the second resistor R15 is electrically connected with the third end of the main control circuit 101, and a second end of the second resistor R15 is electrically connected with the third end of the first protection control circuit 1041 and the first end of the third protection control circuit 1043 respectively.

[0085] For example, when the output voltage value meets the turn-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, and then the second resistor R15 pulls up the detection voltage value to the first voltage value; when the output voltage value does not meet the turn-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 then the second resistor R15 pulls down the detection voltage value to the second voltage value.

[0086] It can be seen that, by adding the clamping circuit in the protection logic control circuit, the output accuracy and stability of the detection voltage value can be improved, thereby facilitating to improve the determination accuracy of the main control circuit for the current state of the battery usage.

[0087] In this optional embodiment, optionally, as shown in Figure 2 the first protection control circuit 1041 includes a first port protection module 10411, a first turn-on control module 10412 and a voltage stabilizing module 10413, wherein:

[0088] A first end of the first port protection module 10411 is configured to be electrically connected with a positive electrode of the battery, a second end of the first port protection module 10411 is electrically connected with a first end of the first turn-on control module 10412, a second end of the first turn-on control module 10412 is electrically connected with a first end of the voltage stabilizing module 10413, a third end of the first turn-on control module 10412 is electrically connected with a second end of the clamping circuit 1044 and a first end of the third protection control circuit 1043 respectively, and a second end of the voltage stabilizing module 10413 is electrically connected with a first end of the second protection control circuit 1042.

[0089] Optionally, Figure 4 is a structural schematic diagram of a protection logic control circuit according to an embodiment of the present application, as shown in Figure 4As shown in the figure, the first port protection module 10411 can include a first diode D4, wherein: the positive electrode of the first diode D4 is used for electrically connecting the positive electrode of the battery, and the negative electrode of the first diode D4 is electrically connected with the first end of the first conduction control module 10412.

[0090] Optionally, as shown in the figure, Figure 4 As shown in the figure, the first conduction control module 10412 can include a first switching device Q8, a third resistor R17 and a fourth resistor R16, wherein: the first end of the first switching device Q8 is electrically connected with the second end of the first port protection module 10411 and the first end of the third resistor R17 respectively, the second end of the first switching device Q8 is electrically connected with the second end of the third resistor R17 and the first end of the voltage stabilizing module 10413 respectively, the third end of the first switching device Q8 is electrically connected with the first end of the fourth resistor R16, and the second end of the fourth resistor R16 is electrically connected with the second end of the clamping circuit 1044 and the first end of the third protection control circuit 1043 respectively.

[0091] Further optionally, the first switching device Q8 can be a triode, or other electronic components capable of playing a conduction control role, and the embodiments of the present application are not limited; further optionally, the first switching device Q8 can be a PNP triode, and the embodiments of the present application are not limited; wherein, when the first switching device Q8 is a triode, the first end of the first switching device Q8 can be an emitter, the second end of the first switching device Q8 can be a base, and the third end of the first switching device Q8 can be a collector.

[0092] Optionally, as shown in the figure, Figure 4 As shown in the figure, the voltage stabilizing module 10413 can include a voltage stabilizing diode D6, wherein: the negative electrode of the voltage stabilizing diode D6 is electrically connected with the second end of the first conduction control module 10412, and the positive electrode of the voltage stabilizing diode D6 is electrically connected with the first end of the second protection control circuit 1042.

[0093] Wherein, the Zener voltage value corresponding to the first protection control circuit 1041 can be the Zener voltage of the voltage stabilizing diode D6, and the embodiments of the present application are not limited.

[0094] It can be seen that by setting the first port protection module in the first protection control circuit, the unidirectional current flow can be ensured and the circuit stability can be stabilized, thereby improving the circuit stability and the circuit safety; by setting the first conduction control module in the first protection control circuit, the control efficiency and the control convenience of the on / off state of the first protection control circuit can be improved, which is conducive to improving the output accuracy of the detection voltage value of the protection logic control circuit, thereby improving the determination accuracy of the current state of the battery usage by the main control circuit, and further improving the control accuracy of the charging / discharging state of the battery by the battery positive electrode; by setting the voltage stabilizing module in the first protection control circuit, the first protection control circuit can be effectively prevented from being in the on state under the on state of other protection control circuits, so as to increase the self-consumption of the battery by the resistance discharge, and even cause the battery cell to appear 0V phenomenon, thereby further improving the control accuracy of the first conduction control circuit and the circuit safety.

[0095] In this optional embodiment, as shown in Figure 2 the second protection control circuit 1042 can include a second port protection module 10421, a second conduction control module 10422, and a third port protection module 10423, wherein:

[0096] The first end of the second port protection module 10421 is used for electrically connecting the output positive electrode; 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 respectively 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; the third end of the third port protection module 10423 and the fourth end of the third port protection module 10423 are respectively used for electrically connecting the fourth end of the second protection control circuit 1042 and the output negative electrode.

[0097] Optionally, as shown in Figure 4 the second port protection module 10421 can include a second diode D3, wherein: the first end of the second diode D3 is used for electrically connecting the output positive electrode, and the second end of the second diode D3 is electrically connected with the first end of the second conduction control module 10422.

[0098] Optionally, as shown in Figure 4As shown, the second conduction control module 10422 can include a second switching device Q9 and a fifth resistor R19, wherein: the first end of the second switching device Q9 is electrically connected with the second end of the second port protection module 10421 and the first end of the fifth resistor R19 respectively, the second end of the second switching device Q9 is electrically connected with the second end of the fifth resistor R19 and the second end of the third port protection module 10423 respectively, and the third end of the second switching device Q9 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 respectively.

[0099] Further optionally, the second switching device Q9 can be a triode, or other electronic components capable of conducting control, and the embodiments of the present application are not limited; further optionally, the second switching device Q9 can be a PNP triode, and the embodiments of the present application are not limited; wherein, when the second switching device Q9 is a triode, the first end of the second switching device Q9 can be an emitter, the second end of the second switching device Q9 can be a base, and the third end of the second switching device Q9 can be a collector.

[0100] Optionally, as shown, Figure 4 As shown, the third port protection module 10423 can include a third diode D5, a sixth resistor R21 and a seventh resistor R22, wherein: the positive electrode of the third diode D5 is electrically connected with the second end of the second conduction control module 10422 and the second end of the third protection control circuit 1043 respectively, the negative electrode of the third diode D5 is electrically connected with the second end of the first protection control circuit 1041 and the first end of the seventh resistor R22 respectively, the first end of the sixth resistor R21 is electrically connected with the third end of the second conduction control module 10422, and the second end of the sixth resistor R21 is electrically connected with the second end of the seventh resistor R22, the fourth end of the second protection control circuit 1042 and the negative electrode of the output end.

[0101] It can be seen that by setting the second port protection module in the second protection control circuit, the unidirectional current flow and stable circuit can be ensured, thereby improving the circuit stability and circuit safety; and by setting the second conduction control module in the second protection control circuit, the control efficiency and control convenience of the conduction / cutoff state of the second protection control circuit can be improved, thereby improving the control efficiency and control convenience of the conduction / cutoff state of the third protection control circuit, which is beneficial to improve the output accuracy of the detection voltage value of the protection logic control circuit, and further beneficial to improve the determination accuracy of the current state of the battery usage by the main control circuit, and further beneficial to improve the control accuracy of the charging / discharging state of the battery by the positive electrode of the battery; and by setting the third port protection module in the second protection control circuit, the current limiting effect can be achieved while ensuring the unidirectional current flow and stable circuit, thereby further improving the circuit stability and circuit safety.

[0102] In the optional embodiment, the third protection control circuit 1043 comprises a third conduction control module 10431 and a current limiting module 10432, wherein:

[0103] The first end of the third conduction control module 10431 is electrically connected with the second end of the clamping circuit 1044 and the third end of the first protection control circuit 1041 respectively, the second end of the third conduction control module 10431 is electrically connected with the first end of the current limiting module 10432, the second end of the current limiting module 10432 is electrically connected with the second end of the second protection control circuit 1042, and the third end of the third conduction control module 10431 is used for electrically connecting the third end and the negative electrode of the output end of the third protection control circuit 1043.

[0104] Optionally, as shown in Figure 4 The third conduction control module 10431 can comprise a third switching device Q7 and an eighth resistor R18, wherein the first end of the third switching device Q7 is electrically connected with the second end of the clamping circuit 1044 and the third end of the first protection control circuit 1041 respectively, the second end of the third switching device Q7 is electrically connected with the first end of the eighth resistor R18 and the first end of the current limiting module 10432 respectively, and the third end of the third switching device Q7 is used for electrically connecting the second end of the eighth resistor R18, the third end of the third protection control circuit 1043 and the negative electrode of the output end.

[0105] Further optionally, the third switching device Q7 can be a triode or other electronic components capable of playing a conduction control role, and the embodiments of the present application are not limited; further optionally, the third switching device Q7 can be an NPN triode, and the embodiments of the present application are not limited; wherein when the third switching device Q7 is a triode, the first end of the third switching device Q7 can be a collector, the second end of the third switching device Q7 can be a base, and the third end of the third switching device Q7 can be an emitter.

[0106] Optionally, as shown in Figure 4 The current limiting module 10432 can comprise a ninth resistor R20, wherein the first end of the ninth resistor R20 is electrically connected with the second end of the third conduction control module 10431, and the second end of the ninth resistor R20 is electrically connected with the second end of the second protection control circuit 1042.

[0107] It can be seen that, by setting the third conduction control module in the third protection control circuit, the control efficiency and control convenience of controlling the on / off state of the third protection control circuit can be improved, which is conducive to improving the output accuracy of the detection voltage value of the protection logic control circuit, and further conducive to improving the determination accuracy of the current state of the battery usage by the main control circuit, and further conducive to improving the control accuracy of the charging / discharging state of the battery by the positive electrode of the battery; and by setting the current limiting module in the third protection control circuit, the signal input to the third protection control circuit under the on state of the second protection control module can play a role in current limiting, thereby protecting the normal use of the third conduction control module, and further improving the circuit stability and circuit safety.

[0108] In yet another optional embodiment, as shown in Figure 2 the charging / discharging circuit 103 includes a discharging control module 1031 and a charging control module 1032, wherein:

[0109] The first end of the discharging control module 1031 is electrically connected to the third end of the driving circuit 102, the first end of the charging control module 1032 is electrically connected to the fourth end of the driving circuit 102, the second end of the discharging control module 1031 is electrically connected to the second end of the charging control module 1032, and the third end of the discharging control module 1031 and the fifth end of the driving circuit 102 are respectively used for electrically connecting the positive electrode of the battery; the third end of the charging control module 1032 and the sixth end of the driving circuit 102 are respectively used for electrically connecting the positive electrode of the output end.

[0110] 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.

[0111] 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.

[0112] Optionally, as shown in Figure 3 the discharging control module 1031 can include a discharging MOS tube, wherein: the first end of the discharging MOS tube is electrically connected to the third end of the driving circuit 102, the second end of the discharging MOS tube is electrically connected to the second end of the charging control module 1032, and the third end of the discharging MOS tube is used for electrically connecting the positive electrode of the battery.

[0113] Further optionally, the discharging MOS tube can be a PMOS, and when the discharging MOS tube is a PMOS, the first end of the discharging MOS tube can be a gate (G), the second end of the discharging MOS tube can be a drain (D), and the third end of the discharging MOS tube can be a source (S).

[0114] Optionally, as shown in Figure 3As shown, the charging control module 1032 may include a charging MOSFET, wherein: the first end of the charging MOSFET is electrically connected to the fourth end of the driving circuit 102, the second end of the charging MOSFET is electrically connected to the second end of the discharging control module 1031, and the third end of the charging MOSFET is used to electrically connect to the positive terminal of the output terminal.

[0115] Alternatively, the charging MOSFET can be a PMOS. When the charging MOSFET is a PMOS, the first terminal of the charging MOSFET can be the gate (G), the second terminal of the charging MOSFET can be the drain (D), and the third terminal of the charging MOSFET can be the source (S).

[0116] It is evident that by incorporating charging and discharging control modules into the charging and discharging circuit, the drive signal can flexibly and accurately control the on / off state of the two modules. This enhances the flexibility and precision of controlling whether the battery can be charged / discharged, thereby improving battery protection efficiency and reliability, and ultimately contributing to improved battery safety.

[0117] The working principle of the protection circuit applied to the positive electrode of the battery in this embodiment is as follows:

[0118] by Figure 4 Taking an example, the working principle of this application will be explained: The battery positive electrode protection scheme of this application uses a negative electrode protection IC to build a drive circuit to control the charging PMOS / discharging PMOS in the main circuit, and a protection logic control circuit is set to realize the protection state release function. The control logic of the protection logic control is as follows depending on the battery state:

[0119] (1) Initial power-on state:

[0120] When the battery connected in this solution is first powered on, there is no voltage at the output terminals P+ and P-, and the output voltage V is... OUT =0V; At this time, in the protection logic control circuit, transistors Q9 and Q7 are in the off state, transistor Q8 is in the on state, and VM is pulled up to the positive terminal B+ of the battery through the resistor, V VM =V BAT -0.7V > V LD (V BAT V is the battery voltage. LD (for load detection voltage); the negative protection IC assumes that the output terminal is connected to the load at this time, the discharge MOS is in the off state, and the charging MOS is in the on state;

[0121] (2) Charging activation status:

[0122] When the battery connected to the charger for the first time in this solution is charged, there is voltage at the output terminals P+ and P-, and the output voltage V at the output terminals is...OUT =V MAX (V MAX is the full charge voltage of the battery); in the protection logic control circuit, transistors Q9 and Q7 are switched from the off state to the on state; to avoid transistor Q8 still being in the on state, so that the battery discharges through the resistor to increase self-consumption, and even cause the battery cell to appear 0V, a zener diode D6 is introduced in the circuit; when V OUT <V BAT -V Z (V Z is the Zener voltage of the zener diode), transistor Q8 is in the on state; due to the presence of zener diode D6, transistor Q8 is switched from the on state to the off state at this time, VM is pulled down to P- through the resistor, V VM =0V<V CHG_RM (V CHG_RM is the charger removal detection voltage); the negative protection IC considers that the output terminal is connected to the charger at this time, and controls the discharge MOS to switch from the off state to the on state;

[0123] (3) Overcharge protection state:

[0124] When overcharge protection is triggered, the negative protection IC controls the charging MOS to switch from the on state to the off state; after entering the overcharge protection state, the output terminals P+ and P- still have voltage, V OUT =V BAT -V SD (V SD is the body diode voltage drop of the MOS); at this time, transistors Q9 and Q7 in the protection logic control circuit are in the on state; due to the presence of zener diode D6, transistor Q8 is in the off state at this time, VM is pulled down to P-, V VM =0V<V CHG_RM ; the negative protection IC considers that the output terminal is connected to the charger at this time, and does not meet the overcharge protection release condition, and needs to be discharged to reduce the voltage of the battery cell until it is less than the overcharge release voltage to recover;

[0125] (4) Over-discharge protection state:

[0126] When over-discharge protection is triggered, the negative protection IC controls the discharge MOS to switch from the on state to the off state; after entering the over-discharge protection state, the output terminals P+ and P- have no voltage, V OUT =0V; at this time, transistors Q9 and Q7 in the protection logic control circuit are in the off state, transistor Q8 is in the on state, VM is pulled up to B+ through the resistor, V VM =V BAT -0.7V>V LD; the negative protection IC considers that the output end is connected with the load at this time, and the over-discharge protection release condition is not met; connecting the charger in the over-discharge protection state, V OUT =V BAT +V SD , the triode Q9 and Q7 are switched from the off state to the on state, the triode Q8 is switched from the on state to the off state, VM is pulled down to P-, and V VM =0V<V CHG_RM ; the negative protection IC considers that the output end is connected with the charger at this time, and the over-discharge protection release condition is met, and the discharging MOS is switched from the off state to the on state;

[0127] (5) discharging over-current protection state:

[0128] When the discharging over-current protection is triggered, the negative protection IC controls the discharging MOS to be switched from the on state to the off state; after entering the discharging over-current protection state, the output end P+ and P- have no voltage, V OUT =0V; at this time, the triode Q9 and Q7 in the protection logic control circuit are in the off state, the triode Q8 is in the on state, VM is pulled up to B+ through the resistor, V VM =V BAT -0.7V>V LD ; the negative protection IC considers that the output end is connected with the load at this time, and the discharging over-current protection release condition is not met; connecting the charger in the discharging over-current protection state, V OUT =V BAT +V SD , the triode Q9 and Q7 are switched from the off state to the on state, the triode Q8 is switched from the on state to the off state; VM is pulled down to P-, and V VM =0V<V LD ; the negative protection IC considers that the output end is not connected with the load at this time, and the discharging over-current protection release condition is met, and the discharging MOS is switched from the off state to the on state;

[0129] (6) charging over-current protection state:

[0130] When the charging over-current protection is triggered, the negative protection IC controls the charging MOS and the discharging MOS to be switched from the on state to the off state; when the charger is not pulled out, the output end P+ and P- have voltage, V OUT =V MAX ; at this time, the triode Q9 and Q7 in the protection logic control circuit are in the on state, the triode Q8 is in the off state, VM is pulled down to P-, and V VM =0V<V CHG_RM ; the negative protection IC considers that the output end is connected with the charger at this time, and the charging over-current protection release condition is not met; when the charger is pulled out, the output end P+ and P- have no voltage, V OUT=0V; triode Q9, Q7 change from conducting state to cut-off state, triode Q8 change from cut-off state to conducting state, VM pull up to B+, V VM =V BAT -0.7V>V CHG_RM ; negative protection IC considers that the output terminal is not connected with charger at this time, and meets the condition of releasing the charging over-current protection, and controls charging MOS and discharging MOS to change from off state to conducting state.

[0131] (7) charger reverse connection protection state:

[0132] When no protection function is triggered and in normal working state, the output terminal P+, P- has voltage, V OUT =V BAT ; at this time, triode Q9, Q7 in protection logic control circuit are in conducting state, triode Q8 is in cut-off state, VM is pulled down to P-, V VM =0V; the charger reverse connection triggers discharging over-current protection function; after entering discharging over-current protection state, the output terminal voltage V OUT =-V MAX , at this time, triode Q9, Q7 are in cut-off state, triode Q8 is in conducting state, VM is pulled up to B+ through resistance, V VM =V BAT -0.7V>V LD ; negative protection IC considers that the output terminal is connected with load at this time, and does not meet the condition of releasing discharging over-current protection; when the charger is pulled out, the output terminal voltage V OUT =0V, at this time, the state of triode Q9, Q7, Q8 is unchanged, VM is still pulled up to B+ through resistance, V VM =V BAT -0.7V>V LD ; negative protection IC considers that the output terminal is connected with load at this time, and does not meet the condition of releasing discharging over-current protection; when the charger is correctly connected, the output terminal voltage V OUT =V MAX , at this time, triode Q9, Q7 change from cut-off state to conducting state, triode Q8 change from conducting state to cut-off state, VM is pulled down to P-, V VM =0V LD ; negative protection IC considers that the output terminal is not connected with load at this time, and meets the condition of releasing discharging over-current protection, and controls discharging MOS to change from off state to conducting state.

[0133] Example two

[0134] Please refer to Figure 5 , Figure 5is a structural schematic diagram of an electronic device disclosed by the embodiment of the present application, which comprises the protection circuit applied to the positive electrode of the battery according to any one of the embodiments. The functions that can be realized by the electronic device include but are not limited to the function of determining whether the current state of the battery needs protection based on the battery voltage and the output port voltage, so as to control the charging / discharging of the battery at the positive electrode of the battery. It should be noted that the detailed description of the protection circuit applied to the positive electrode of the battery can be referred to the specific description of the related content in the first embodiment, and the present embodiment will not be described again.

[0135] It can be seen that the embodiments Figure 5 The electronic device described herein can control the multiple protection control circuits in the protection logic control circuit to be in the on state / off state respectively, so as to output the detection voltage value to the main control circuit, by the protection logic control circuit according to the battery voltage value of the battery and the output voltage value of the output terminal; detect the detection voltage value output by the protection logic control circuit by the main control circuit; determine the current state of the battery according to the detection voltage value; output the control signal corresponding to the current state to the driving circuit according to the current state; generate the driving signal corresponding to the control signal by the driving circuit according to the received control signal, and output the driving signal to the charging / discharging circuit; control the charging / discharging circuit to be on or off based on the received driving signal by the charging / discharging circuit; when the charging / discharging circuit is on, control the battery to discharge to the load or control the power supply to charge the battery, which can control the on / off of the protection logic control circuit based on the battery voltage and the output port voltage, so as to determine whether the current state of the battery needs protection according to the detection voltage value in different on / off states of the protection logic control circuit, improve the accuracy of determining whether the battery is in the activated state or in the protection state or needs to be in the state of being released from protection, and control whether the battery can be charged / discharged at the positive electrode of the battery, so as to efficiently protect the positive electrode of the battery, improve the timeliness of protecting and releasing the protection of the battery, and further improve the reliability of the protection of the battery, which is conducive to stopping using the battery in time in the case of safety risk and allowing using the battery in time in the case of releasing the safety risk, and further conducive to improving the safety of using the battery. In addition, the driving circuit can output the driving signal that is more stable and accurate to the charging / discharging circuit after processing the control signal output by the main control circuit, which can improve the signal output accuracy and stability, so as to improve the driving reliability and control reliability of the charging / discharging circuit, further improve the control reliability of whether the battery can be charged / discharged at the positive electrode of the battery, further improve the timeliness of protecting and releasing the protection of the battery, and further improve the reliability of the protection of the battery.

[0136] The application discloses a protection circuit applied to a positive electrode of a battery and an electronic device. The application is described by using specific examples, but the preferred examples are not used to limit the application. The above examples are used to help understand the method and the core idea of the application. Meanwhile, for the general technical personnel in the field, the application can be changed in the specific implementation and application range without departing from the spirit and scope of the application. Therefore, the protection scope of the application is defined by the claims.

Claims

1. A protection circuit applied to the positive terminal of a battery, characterized in that, The application relates to a protection circuit (10) applied to a battery positive electrode, which comprises a main control circuit (101), a driving circuit (102), a charge-discharge circuit (103) and a protection logic control circuit (104). 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 negative electrode of a battery and grounding; the third end of the driving circuit (102) is electrically connected with the first end of the charge-discharge circuit (103), and the fourth end of the driving circuit (102) is electrically connected with the second end of the charge-discharge circuit (103). 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 electrically connecting 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 electrically connecting the positive electrode of an output end; the sixth end of the main control circuit (101) and the fourth end of the protection logic control circuit (104) are used for electrically connecting the negative electrode of the output end; The protection logic control circuit (104) is used for outputting a detection voltage value to the main control circuit (101) according to the battery voltage value of the battery and the output voltage value of the output end; The main control circuit (101) is used for 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); The driving circuit (102) is used for outputting 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 turned off.

2. The protection circuit for a battery positive electrode according to claim 1, wherein The main control circuit (101) comprises a control chip (1011) and a chip protection module (1012). 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 the positive electrode of the battery, the fifth end of the control chip (1011) is used for electrically connecting the first end of the chip protection module (1012) and the negative electrode of the battery and grounding, and the sixth end of the control chip (1011) is used for electrically connecting the second end of the chip protection module (1012) and the negative electrode of the output end.

3. The protection circuit for a battery positive electrode according to claim 1 or 2, wherein The protection logic control circuit (104) comprises a first protection control circuit (1041), a second protection control circuit (1042) and a third protection control circuit (1043), wherein: The first end of the first protection control circuit (1041) is used for electrically connecting the positive pole 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 pole of the output end; 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 pole of the output end; The first protection control circuit (1041) is used for outputting a first voltage value as a detection voltage value to the main control circuit (101) when the output voltage value of the output end meets a preset conduction condition. The second protection control circuit (1042) is used for controlling the third protection control circuit (1043) to conduct when the output voltage value does not meet the conduction condition, so as to output a second voltage value as a detection voltage value to the main control circuit (101).

4. The protection circuit for a battery positive electrode according to claim 3, wherein The protection logic control circuit (104) further comprises a clamping circuit (1044), wherein: The first end of the clamping circuit (1044) is electrically connected with the third end of the main control circuit (101), and the second end of the clamping circuit (1044) is respectively electrically connected with the third end of the first protection control circuit (1041) and the first end of the third protection control circuit (1043); The clamping circuit (1044) is used for clamping the detection voltage value at the first voltage value or the second voltage value.

5. The protection circuit applied to the positive electrode of a battery according to claim 4, characterized in that, The first protection control circuit (1041) comprises a first port protection module (10411), a first conduction control module (10412) and a voltage stabilizing module (10413), wherein: The first end of the first port protection module (10411) is used for electrically connecting the positive pole 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 respectively electrically connected with the second end of the clamping circuit (1044) and the first end of the third protection control circuit (1043), and the second end of the voltage stabilizing module (10413) is electrically connected with the first end of the second protection control circuit (1042).

6. The protection circuit for a battery positive electrode according to claim 5, wherein The first port protection module (10411) comprises a first diode (D4), wherein: the positive electrode of the first diode (D4) is used for electrically connecting the positive electrode of the battery, and the negative electrode of the first diode (D4) is electrically connected with the first end of the first conduction control module (10412); The first conduction control module (10412) comprises a first switch device (Q8), a third resistor (R17) and a fourth resistor (R16), wherein: the first end of the first switch device (Q8) is electrically connected with the second end of the first port protection module (10411) and the first end of the third resistor (R17) respectively, the second end of the first switch device (Q8) is electrically connected with the second end of the third resistor (R17) and the first end of the voltage stabilizing module (10413) respectively, the third end of the first switch device (Q8) is electrically connected with the first end of the fourth resistor (R16), and the second end of the fourth resistor (R16) is electrically connected with the second end of the clamping circuit (1044) and the first end of the third protection control circuit (1043) respectively; The voltage stabilizing module (10413) comprises a voltage stabilizing diode (D6), wherein: the negative electrode of the voltage stabilizing diode (D6) is electrically connected with the second end of the first conduction control module (10412), and the positive electrode of the voltage stabilizing diode (D6) is electrically connected with the first end of the second protection control circuit (1042).

7. The protection circuit applied to the positive electrode of a battery according to claim 4, wherein The second protection control circuit (1042) comprises a second port protection module (10421), a second conduction control module (10422) and a third port protection module (10423), wherein: 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) respectively; 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); the third end of the third port protection module (10423) and the fourth end of the third port protection module (10423) are used for electrically connecting the fourth end of the second protection control circuit (1042) and the negative electrode of the output end respectively.

8. The protection circuit applied to the positive electrode of a battery according to claim 4, wherein The third protection control circuit (1043) comprises a third conduction control module (10431) and a current limiting module (10432), wherein: A first end of the third conduction control module (10431) is electrically connected with a second end of the clamping circuit (1044) and a third end of the first protection control circuit (1041) respectively, a second end of the third conduction control module (10431) is electrically connected with a first end of the current limiting module (10432), a second end of the current limiting module (10432) is electrically connected with a second end of the second protection control circuit (1042), and a third end of the third conduction control module (10431) is used for electrically connecting a third end of the third protection control circuit (1043) and the negative pole of the output end.

9. The protection circuit for a battery positive electrode according to any one of claims 1, 2, 4, 5, 6, 7 and 8, wherein The charge and discharge circuit (103) comprises a discharge control module (1031) and a charge control module (1032), wherein: A first end of the discharge control module (1031) is electrically connected with a third end of the drive circuit (102), a first end of the charge control module (1032) is electrically connected with a fourth end of the drive circuit (102), a second end of the discharge control module (1031) is electrically connected with a second end of the charge control module (1032), and a third end of the discharge control module (1031) and a fifth end of the drive circuit (102) are respectively used for electrically connecting the positive pole of the battery; a third end of the charge control module (1032) and a sixth end of the drive circuit (102) are respectively used for electrically connecting the positive pole of the output end; The discharge control module (1031) is used for controlling the battery to discharge to the load when the drive signal controls the discharge control module (1031) to be turned on. The charge control module (1032) is used for controlling the power supply to charge the battery when the drive signal controls the charge control module (1032) to be turned on.

10. An electronic device, comprising: The electronic device comprises a device body and the protection circuit applied to the positive pole of the battery according to any one of claims 1-9.

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