Protection circuit and method applied to positive electrode of battery and electronic equipment

Abstract

The invention relates to the technical field of battery protection, and discloses a protection circuit and method applied to a battery positive electrode and electronic equipment, the circuit comprises a main control circuit, a charging and discharging control circuit and a protection logic control circuit, and the protection logic control circuit controls the charging and discharging of a battery according to a battery voltage value and an output voltage value of an output end. The control circuit is used for controlling the plurality of protection control circuits to be respectively in an on / off state, outputting a detection voltage value to the main control circuit, determining the current state of the battery through the main control circuit according to the detection voltage value, and outputting a control signal corresponding to the current state to the charging and discharging control circuit; the charging and discharging control circuit is controlled to be switched on or switched off according to the control signal; and when the charging and discharging control circuit is switched on, the battery is controlled to be discharged / charged. Therefore, 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 / discharging is controlled at the positive electrode of the battery, and therefore the reliability of battery protection is improved.

Description

Technical Field

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

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

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

[0004] Therefore, it is particularly important to propose a technical solution that can improve the reliability of battery protection and thus improve the safety of battery use. Summary of the invention

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

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

[0007] The first end of the main control circuit is electrically connected to the first end of the charge and discharge control circuit, the second end of the main control circuit is electrically connected to the second end of the charge and discharge control circuit, the third end of the main control circuit is electrically connected to the first end of the protection logic control circuit, and the fourth end of the main control circuit is used to electrically connect the negative electrode of the battery and to ground;

[0008] The fifth end of the main control circuit, the third end of the charge and discharge control circuit and the second end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the battery; the fourth end of the charge and discharge control circuit and the third end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the output terminal; the sixth end of the main control circuit and the fourth end of the protection logic control circuit are used to electrically connect the negative electrode of the output terminal;

[0009] The protection logic control circuit is used to output 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 terminal;

[0010] The main control circuit is used to determine the current state of the battery according to the detection voltage value, so as to control the charging and discharging control circuit to be turned on or off.

[0011] As an optional implementation, 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, wherein:

[0012] The first end of the first protection control circuit is used to electrically connect to the positive electrode of the battery, the second end of the first protection control circuit is electrically connected to the first end of the second protection control circuit, the third end of the first protection control circuit is electrically connected to the first end of the third protection control circuit and the third end of the main control circuit respectively; the second end of the second protection control circuit is electrically connected to the second end of the third protection control circuit; the third end of the second protection control circuit is used to electrically connect to the positive electrode of the output terminal; the fourth end of the second protection control circuit and the third end of the third protection control circuit are respectively used to electrically connect to the negative electrode of the output terminal;

[0013] The first protection control circuit is used to output the first voltage value as the detection voltage value to the main control circuit when the output voltage value of the output terminal meets the preset conduction condition;

[0014] The second protection control circuit is used to control the third protection control circuit to be turned on when the output voltage value meets the conduction condition, so as to output the second voltage value as the detection voltage value to the main control circuit.

[0015] As an optional implementation, in the first aspect of the present application, the protection logic control circuit further includes a clamping circuit, wherein:

[0016] The first end of the clamp circuit is electrically connected to the third end of the main control circuit, and the second end of the clamp 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;

[0017] The clamping circuit is used to clamp the detection voltage value at the first voltage value or the second voltage value.

[0018] As an optional implementation, 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 stabilization module, wherein:

[0019] The first end of the first port protection module is used to electrically connect 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 conduction control module, the second end of the first conduction control module is electrically connected to the first end of the voltage stabilizing module, the third end of the first conduction 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.

[0020] As an optional implementation, 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, wherein:

[0021] The first end of the second port protection module is used to electrically connect the positive pole of the output end; the second end of the second port protection module is electrically connected to the first end of the second conduction control module; the second end of the second conduction control module is electrically connected to 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 to the second end of the first protection control circuit; the third end of the second conduction control module is electrically connected to 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 to electrically connect the fourth end of the second protection control circuit and the negative pole of the output end.

[0022] As an optional implementation, in the first aspect of the present application, the third protection control circuit includes a third conduction control module and a current limiting module, wherein:

[0023] The first end of the third conduction control module is electrically connected to 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 to the first end of the current limiting module, the second end of the current limiting module is electrically connected to the second end of the second protection control circuit, and the third end of the third conduction control module is used to electrically connect the third end of the third protection control circuit and the negative electrode of the output end.

[0024] As an optional implementation, in the first aspect of the present application, the charge and discharge control circuit includes a drive circuit and a charge and discharge circuit, wherein:

[0025] The first end of the drive circuit is electrically connected to the first end of the main control circuit, and the second end of the drive circuit is electrically connected to the second end of the main control circuit; the third end of the drive circuit is electrically connected to the first end of the charge and discharge circuit, and the fourth end of the drive circuit is electrically connected to the second end of the charge and discharge circuit; the fifth end of the drive circuit and the third end of the charge and discharge circuit are respectively used to electrically connect to the positive electrode of the battery; the sixth end of the drive circuit and the fourth end of the charge and discharge circuit are respectively used to electrically connect to the positive electrode of the output terminal;

[0026] The driving circuit is used to output a driving signal to the charging and discharging circuit according to the control signal output by the main control circuit, so as to control the charging and discharging circuit to be turned on or off.

[0027] As an optional implementation, in the first aspect of the present application, the charge and discharge circuit includes a discharge control module and a charge control module, wherein:

[0028] The first end of the discharge control module is electrically connected to the third end of the drive circuit, the first end of the charge control module is electrically connected to the fourth end of the drive circuit, the second end of the discharge control module is electrically connected to the second end of the charge control module, the third end of the discharge control module and the fifth end of the drive circuit are respectively used to electrically connect to the positive electrode of the battery; the third end of the charge control module and the sixth end of the drive circuit are respectively used to electrically connect to the positive electrode of the output end.

[0029] The second aspect of the present application discloses a protection method applied to a positive electrode of a battery, wherein the method is applied to a protection circuit of a positive electrode of a battery, wherein the protection circuit comprises a main control circuit, a charge and discharge control circuit and a protection logic control circuit, wherein:

[0030] The first end of the main control circuit is electrically connected to the first end of the charge and discharge control circuit, the second end of the main control circuit is electrically connected to the second end of the charge and discharge control circuit, the third end of the main control circuit is electrically connected to the first end of the protection logic control circuit, and the fourth end of the main control circuit is used to electrically connect the negative electrode of the battery and to ground;

[0031] The fifth end of the main control circuit, the third end of the charge and discharge control circuit and the second end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the battery; the fourth end of the charge and discharge control circuit and the third end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the output terminal; the sixth end of the main control circuit and the fourth end of the protection logic control circuit are used to electrically connect the negative electrode of the output terminal;

[0032] The method comprises:

[0033] The protection logic control circuit controls the multiple 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 the detection voltage value to the main control circuit;

[0034] The main control circuit detects the detection voltage value output by the protection logic control circuit; determines the current state of the battery according to the detection voltage value; and outputs a control signal corresponding to the current state to the charge and discharge control circuit according to the current state;

[0035] The charge and discharge control circuit controls the charge and discharge control circuit to be turned on or off according to the received control signal; wherein, when the charge and discharge control circuit is turned on, the battery is controlled to discharge to the load or the power supply is controlled to charge to the battery.

[0036] The third aspect of the present application discloses an electronic device, which includes a device body and any protection circuit for a positive electrode of a battery as disclosed in the first aspect.

[0037] Compared with the prior art, this application has the following beneficial effects:

[0038] The implementation of the present application can control the protection logic control circuit to be in the on state / off state respectively according to the battery voltage value of the battery and the output voltage value of the output end through the protection logic control circuit, so as to output the detection voltage value to the main control circuit; the detection voltage value output by the protection logic control circuit is detected by the main control circuit; the current state of the battery is determined according to the detection voltage value; according to the current state, a control signal corresponding to the current state is output to the charge and discharge control circuit; wherein the current state includes at least one of the battery connection state, activation state, protection state and protection release state; the charge and discharge control circuit is controlled to be on or off according to the received control signal through the charge and discharge control circuit; when the charge and discharge control circuit is on, the battery is controlled to be Discharging to the load or controlling the power supply to charge the battery can control the on / off state 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 by the detection voltage value under different on / off states of the protection logic control circuit, and at the same time of improving the accuracy of determining whether the battery is in an activated state, a protected state, or needs to be released from the protection state, control whether the battery can be charged and discharged at the positive electrode of the battery to efficiently protect the positive electrode of the battery, thereby improving the timeliness of battery protection and the timeliness of releasing protection, and further improving the reliability of battery protection, which is conducive to stopping the use of the battery in time when there is a safety risk and allowing the battery to be used again in time when the safety risk is lifted, and further helping to improve the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a structural schematic diagram of a protection circuit applied to a positive electrode of a battery disclosed in an embodiment of the present application;

[0041] Figure 2 It is a structural schematic diagram of another protection circuit applied to a positive electrode of a battery disclosed in an embodiment of the present application;

[0042] Figure 3 It is a structural schematic diagram of another protection circuit applied to a positive electrode of a battery disclosed in an embodiment of the present application;

[0043] Figure 4 It is a structural schematic diagram of a protection logic control circuit disclosed in an embodiment of the present application;

[0044] Figure 5 It is a flow chart of a protection method applied to a positive electrode of a battery disclosed in an embodiment of the present application;

[0045] Figure 6 It is a structural schematic diagram of an electronic device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] It should be noted that, unless otherwise clearly specified and limited, the term "electrical connection" in the specification and claims of this application and the above-mentioned drawings should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. In addition, the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] Embodiment 1

[0049] See also Figure 1 , Figure 1 1 is a schematic diagram of a protection circuit for a positive electrode of a battery disclosed in an embodiment of the present application. The circuit can be applied to a circuit that uses a battery for charging / discharging, and can also be applied to a BMS (Battery Management System), which is not limited in the embodiment of the present application. Figure 1 As shown, the protection circuit applied to the positive electrode of the battery may include a main control circuit 101, a charge and discharge control circuit 102 and a protection logic control circuit 103, wherein:

[0050] A first end of the main control circuit 101 is electrically connected to a first end of the charge and discharge control circuit 102, a second end of the main control circuit 101 is electrically connected to a second end of the charge and discharge control circuit 102, a third end of the main control circuit 101 is electrically connected to a first end of the protection logic control circuit 103, and a fourth end of the main control circuit 101 is used to electrically connect to the negative electrode of the battery and to ground;

[0051] The fifth terminal of the main control circuit 101, the third terminal of the charge and discharge control circuit 102 and the second terminal of the protection logic control circuit 103 are respectively used to electrically connect to the positive electrode of the battery; the fourth terminal of the charge and discharge control circuit 102 and the third terminal of the protection logic control circuit 103 are respectively used to electrically connect to the positive electrode of the output terminal; the sixth terminal of the main control circuit 101 and the fourth terminal of the protection logic control circuit 103 are used to electrically connect to the negative electrode of the output terminal;

[0052] The protection logic control circuit 103 is used to output 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 terminal;

[0053] The main control circuit 101 is used to determine the current state of the battery according to the detected voltage value, so as to control the charge and discharge control circuit 102 to be turned on or off.

[0054] Optionally, the above description of the main control circuit 101, the charge and discharge control circuit 102 and the protection logic control circuit 103 may be specifically as follows:

[0055] The protection logic control circuit 103 is used to control the multiple protection control circuits in the protection logic control circuit 103 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 terminal, so as to output the detection voltage value to the main control circuit 101;

[0056] The main control circuit 101 is used to detect the detection voltage value output by the protection logic control circuit 103; 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 charge and discharge control circuit 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;

[0057] The charge and discharge control circuit 102 is used to control the charge and discharge control circuit 102 to be turned on or off according to the received control signal; wherein, when the charge and discharge control circuit 102 is turned on, the battery is controlled to discharge to the load or the power supply is controlled to charge the battery.

[0058] Among them, optionally, the battery connection state may include a load connection state or a charger connection state, the activation state may include an initial power-on state or a charging activation state, and the protection state may include an overcharge protection state, an over-discharge protection state, a discharge overcurrent protection state, a charge overcurrent protection state, and a charger reverse connection protection state; the protection release state may be restored to a normal working state from any of the above protection states, which is not limited in the embodiments of the present application.

[0059] in, Figure 3 is a schematic diagram of another structure of a protection circuit applied to a positive electrode of a battery disclosed in an embodiment of the present application, such as Figure 3 As shown, the positive electrode of the battery can be Figure 3 The B+ shown, the positive output terminal can be Figure 3 The output negative terminal can be as shown in P+. Figure 3 P- shown.

[0060] It can be seen that the embodiment of the present application can control multiple protection control circuits in the protection logic control circuit to be in the on state / off state respectively according to the battery voltage value of the battery and the output voltage value of the output end through the protection logic control circuit, so as to output the detection voltage value to the main control circuit; detect the detection voltage value output by the protection logic control circuit through the main 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 charge and discharge control circuit according to the current state; wherein the current state includes at least one of the battery connection state, activation state, protection state and protection release state; control the charge and discharge control circuit to be turned on or off according to the received control signal through the charge and discharge control circuit; when the charge and discharge control circuit is turned on, the control The battery discharges to the load or controls the power supply to charge the battery, and can control the on / off state 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 by the detection voltage value under different on / off states of the protection logic control circuit, and at the same time improve the accuracy of determining whether the battery is in an activated state, a protected state, or needs to be released from the protection state, control whether the battery can be charged and discharged at the positive electrode of the battery to efficiently protect the positive electrode of the battery, thereby improving the timeliness of battery protection and the timeliness of releasing protection, and further improving the reliability of battery protection, which is conducive to stopping the use of the battery in time when there is a safety risk and allowing the battery to be used again in time when the safety risk is lifted, and further helping to improve the safety of battery use.

[0061] In an alternative embodiment, Figure 2 is a schematic diagram of another structure of a protection circuit applied to a positive electrode of a battery disclosed in an embodiment of the present application, such as Figure 2 As shown, the main control circuit 101 may include a control chip 1011 and a chip protection module 1012, wherein:

[0062] The first end of the control chip 1011 is electrically connected to the first end of the charge and discharge control circuit 102, the second end of the control chip 1011 is electrically connected to the second end of the charge and discharge control circuit 102, the third end of the control chip 1011 is electrically connected to the first end of the protection logic control circuit 103, the fourth end of the control chip 1011 is used to electrically connect to the positive electrode of the battery, the fifth end of the control chip 1011 is used to electrically connect to the first end of the chip protection module 1012 and the negative electrode of the battery and to ground, and the sixth end of the control chip 1011 is used to electrically connect to the second end of the chip protection module 1012 and the negative electrode of the output end.

[0063] Optionally, the main control circuit 101 determines the current state of the battery based on the detected voltage value, which can be specifically as follows: the control chip 1011 can 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 based on the voltage comparison result.

[0064] Among them, the preset voltage value set may include at least one preset detection voltage value. 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 embodiments of the present application.

[0065] It can be seen that the state determination and control signal output functions of the main control circuit are realized through the control chip and the chip protection module. Among them, the battery state is determined by the pre-set judgment logic and preset voltage value set of the control chip, which can improve the determination efficiency and accuracy of the battery state and improve the output accuracy of the control signal, thereby improving the on / off control accuracy of the charge and discharge control circuit, and then improving the control efficiency and control accuracy of controlling the battery charge / discharge at the positive electrode of the battery, thereby further improving the timeliness of battery protection and the timeliness of releasing protection; and, by setting a chip protection module, the safety of use of the control chip can be improved.

[0066] Optional, such as Figure 3 As shown, the control chip 1011 may be a cathode protection IC (Integrated Circuit, chip), and the chip protection module 1012 may include a first resistor R1, wherein:

[0067] The first end of the negative electrode protection IC is electrically connected to the first end of the charge and discharge control circuit 102, the second end of the negative electrode protection IC is electrically connected to the second end of the charge and discharge control circuit 102, the third end of the negative electrode protection IC is electrically connected to the first end of the protection logic control circuit 103, the fourth end of the negative electrode protection IC is used to electrically connect to the positive electrode of the battery, the fifth end of the negative electrode protection IC is used to electrically connect to the first end of the first resistor R1 and the negative electrode of the battery and to ground, and the sixth end of the negative electrode protection IC is used to electrically connect to the second end of the first resistor R1 and the negative electrode of the output terminal.

[0068] It should be noted that when the protection scheme uses a negative electrode protection IC (such as Figure 3 As shown), a driving circuit is built to control the PMOS in the main circuit; however, after entering the protection state, since the GND of the BMS is directly connected to the negative electrode P- of the output terminal, the negative electrode protection IC cannot detect the voltage of the negative electrode P- of the output terminal to realize the protection state release function; therefore, an external protection logic control circuit is required to realize the protection state release function.

[0069] It can be seen that by selecting the negative electrode protection IC as the control chip, compared with the existing technology, it can not only avoid the system ground being suspended or raising the system-side reference ground when the charge and discharge control circuit is cut off (that is, avoid the voltage difference between the system-side reference ground and the GND of the BMS), but also compared with the selection of the positive electrode protection IC, it can expand the model selection range of the control chip, and can reduce the research and development cost of the battery protection solution while improving the flexibility of the control chip selection; and, by selecting a resistor as the chip protection module, the chip protection cost can be reduced and the chip safety can be improved.

[0070] In another optional embodiment, Figure 2 As shown, the protection logic control circuit 103 may include a first protection control circuit 1031, a second protection control circuit 1032 and a third protection control circuit 1033, wherein:

[0071] The first end of the first protection control circuit 1031 is used to electrically connect to the positive electrode of the battery, the second end of the first protection control circuit 1031 is electrically connected to the first end of the second protection control circuit 1032, and the third end of the first protection control circuit 1031 is electrically connected to the first end of the third protection control circuit 1033 and the third end of the main control circuit 101 respectively; the second end of the second protection control circuit 1032 is electrically connected to the second end of the third protection control circuit 1033; the third end of the second protection control circuit 1032 is used to electrically connect to the positive electrode of the output terminal; the fourth end of the second protection control circuit 1032 and the third end of the third protection control circuit 1033 are respectively used to electrically connect to the negative electrode of the output terminal;

[0072] The first protection control circuit 1031 is used to output the first voltage value as the detection voltage value to the main control circuit 101 when the output voltage value of the output terminal meets the preset conduction condition;

[0073] The second protection control circuit 1032 is used to control the third protection control circuit 1033 to be turned on when the output voltage value does not meet the conduction condition, so as to output the second voltage value as the detection voltage value to the main control circuit 101.

[0074] Optionally, the above description of the first protection control circuit 1031, the second protection control circuit 1032, and the third protection control circuit 1033 may be specifically as follows:

[0075] A first protection control circuit 1031, configured to control the first protection control circuit 1031 to be turned on when the output voltage value of the output terminal meets a preset turn-on condition, and output a first voltage value as a detection voltage value to the main control circuit 101, wherein the first voltage value is determined based on the battery voltage value and the first preset voltage value; when the output voltage value does not meet the turn-on condition, the first protection control circuit 1031 is turned off;

[0076] The second protection control circuit 1032 is used to control the second protection control circuit 1032 to be turned off when the output voltage value meets the conduction condition; and to control the second protection control circuit 1032 to be turned on when the output voltage value does not meet the conduction condition;

[0077] The third protection control circuit 1033 is used to control the conduction of the third protection control circuit 1033 when the second protection control circuit 1032 is in the on state, and output the second voltage value as the detection voltage value to the main control circuit 101, wherein the second voltage value is the voltage value of the negative pole of the output terminal; when the second protection control circuit 1032 is in the off state, the third protection control circuit 1033 is controlled to be off.

[0078] Optionally, the preset conduction condition may be specifically: the output voltage value of the output end is 0V, or the output voltage value of the output end is less than the difference between the battery voltage value and the Zener voltage value corresponding to the first protection control circuit 1031, which is not limited in the embodiment of the present application.

[0079] Exemplarily, the first voltage value may be a difference between a battery voltage value and a first preset voltage value (eg, 0.7V), which is not limited in the embodiment of the present application; the second voltage value may be 0V, which is not limited in the embodiment of the present application.

[0080] 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 conduction condition, and the first protection control circuit is selected to be turned on, or the second protection control circuit and the third protection control circuit are turned on under different judgment results, so that the main control circuit can detect different detection voltage values ​​based on different circuit conduction conditions, thereby improving the circuit conduction control flexibility and control efficiency of the protection logic control circuit, so as to flexibly and efficiently output the corresponding detection voltage values ​​under different conduction conditions to the main control circuit, which is beneficial to improve the accuracy and efficiency of the main control circuit in determining the current state of battery usage.

[0081] In this optional embodiment, optionally, as Figure 2 As shown, the protection logic control circuit 103 may further include a clamping circuit 1034, wherein:

[0082] The first end of the clamp circuit 1034 is electrically connected to the third end of the main control circuit 101, and the second end of the clamp circuit 1034 is electrically connected to the third end of the first protection control circuit 1031 and the first end of the third protection control circuit 1033 respectively;

[0083] The clamping circuit 1034 is used to clamp the detection voltage value at the first voltage value or the second voltage value.

[0084] Optionally, the clamping circuit 1034 can be specifically used to pull up the detection voltage value to a first voltage value when the output voltage value meets the conduction condition, and pull down the detection voltage value to a second voltage value when the output voltage value does not meet the conduction condition; and output the detection voltage value to the main control circuit 101.

[0085] Optional, such as Figure 3 As shown, the clamping circuit 1034 may include a second resistor R15, wherein: the first end of the second resistor R15 is electrically connected to the third end of the main control circuit 101, and the second end of the second resistor R15 is electrically connected to the third end of the first protection control circuit 1031 and the first end of the third protection control circuit 1033 respectively.

[0086] Exemplarily, when the output voltage value meets the turn-on condition, the first protection control circuit 1031 is turned on, the second protection control circuit 1032 and the third protection control circuit 1033 are turned off, and the second resistor R15 pulls the detection voltage value up to the first voltage value; when the output voltage value does not meet the turn-on condition, the first protection control circuit 1031 is turned off, the second protection control circuit 1032 and the third protection control circuit 1033 are turned on, and the second resistor R15 pulls the detection voltage value down to the second voltage value.

[0087] It can be seen that by adding a clamping circuit to the protection logic control circuit, the output accuracy and output stability of the detection voltage value can be improved, which is beneficial to improving the accuracy of the main control circuit's judgment on the current state of battery usage.

[0088] In this optional embodiment, optionally, as Figure 2 As shown, the first protection control circuit 1031 includes a first port protection module 10311, a first conduction control module 10312 and a voltage stabilization module 10313, wherein:

[0089] The first end of the first port protection module 10311 is used to electrically connect to the positive electrode of the battery, the second end of the first port protection module 10311 is electrically connected to the first end of the first conduction control module 10312, the second end of the first conduction control module 10312 is electrically connected to the first end of the voltage stabilizing module 10313, the third end of the first conduction control module 10312 is respectively electrically connected to the second end of the clamping circuit 1034 and the first end of the third protection control circuit 1033, and the second end of the voltage stabilizing module 10313 is electrically connected to the first end of the second protection control circuit 1032.

[0090] Optional, Figure 4 is a schematic diagram of a protection logic control circuit disclosed in an embodiment of the present application, such as Figure 4As shown, the first port protection module 10311 may include a first diode D4, wherein: the anode of the first diode D4 is used to electrically connect to the anode of the battery, and the cathode of the first diode D4 is electrically connected to the first end of the first conduction control module 10312.

[0091] Optional, such as Figure 4 As shown, the first conduction control module 10312 may include 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 to the second end of the first port protection module 10311 and the first end of the third resistor R17, respectively, the second end of the first switch device Q8 is electrically connected to the second end of the third resistor R17 and the first end of the voltage stabilizing module 10313, respectively, the third end of the first switch device Q8 is electrically connected to the first end of the fourth resistor R16, and the second end of the fourth resistor R16 is electrically connected to the second end of the clamping circuit 1034 and the first end of the third protection control circuit 1033, respectively.

[0092] Further optionally, the first switching device Q8 can be a transistor or other electronic component that can play a conduction control role, which is not limited in the embodiment of the present application; further optionally, the first switching device Q8 can be a PNP transistor, which is not limited in the embodiment of the present application; wherein, when the first switching device Q8 is a transistor, 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.

[0093] Optional, such as Figure 4 As shown, the voltage stabilizing module 10313 may include a voltage stabilizing diode D6, wherein: the cathode of the voltage stabilizing diode D6 is electrically connected to the second end of the first conduction control module 10312, and the anode of the voltage stabilizing diode D6 is electrically connected to the first end of the second protection control circuit 1032.

[0094] Among them, the Zener voltage value corresponding to the above-mentioned first protection control circuit 1031 can be the Zener voltage of the voltage regulator diode D6, which is not limited in the embodiment of the present application.

[0095] It can be seen that by setting the first port protection module in the first protection control circuit, it is possible to ensure unidirectional current flow and stabilize the circuit, thereby improving circuit stability and circuit safety; and, by setting the first conduction control module in the first protection control circuit, it is possible to improve the control efficiency and control convenience of controlling the on / off state of the first protection control circuit, which is beneficial to improving the output accuracy of the detection voltage value of the protection logic control circuit, and then to improve the accuracy of the main control circuit's judgment on the current state of battery usage, and then to improve the control accuracy of the battery's charging and discharging state at the battery positive electrode; and, by setting the voltage stabilizing module in the first protection control circuit, it is possible to effectively avoid the first protection control circuit from being in the on state when other protection control circuits are turned on, so that the battery discharges through resistance to increase self-consumption, and even cause the battery cell to appear 0V, and then the control accuracy and circuit safety of the first conduction control circuit can be further improved.

[0096] In this optional embodiment, optionally, as Figure 2 As shown, the second protection control circuit 1032 may include a second port protection module 10321, a second conduction control module 10322 and a third port protection module 10323, wherein:

[0097] The first end of the second port protection module 10321 is used to electrically connect to the positive pole of the output terminal; the second end of the second port protection module 10321 is electrically connected to the first end of the second conduction control module 10322; the second end of the second conduction control module 10322 is electrically connected to the first end of the third port protection module 10323 and the second end of the third protection control circuit 1033 respectively; the second end of the third port protection module 10323 is electrically connected to the second end of the first protection control circuit 1031; the third end of the second conduction control module 10322 is electrically connected to the second end of the third port protection module 10323; the third end of the third port protection module 10323 and the fourth end of the third port protection module 10323 are respectively used to electrically connect to the fourth end of the second protection control circuit 1032 and the negative pole of the output terminal.

[0098] Optional, such as Figure 4 As shown, the second port protection module 10321 may include a second diode D3, wherein: the first end of the second diode D3 is used to electrically connect to the positive electrode of the output terminal, and the second end of the second diode D3 is electrically connected to the first end of the second conduction control module 10322.

[0099] Optional, such as Figure 4As shown, the second conduction control module 10322 may include a second switch device Q9 and a fifth resistor R19, wherein: the first end of the second switch device Q9 is electrically connected to the second end of the second port protection module 10321 and the first end of the fifth resistor R19, respectively; the second end of the second switch device Q9 is electrically connected to the second end of the fifth resistor R19 and the second end of the third port protection module 10323, respectively; and the third end of the second switch device Q9 is electrically connected to the first end of the third port protection module 10323 and the second end of the third protection control circuit 1033, respectively.

[0100] Further optionally, the second switching device Q9 can be a transistor or other electronic component that can play a conduction control role, which is not limited in the embodiment of the present application; further optionally, the second switching device Q9 can be a PNP transistor, which is not limited in the embodiment of the present application; wherein, when the second switching device Q9 is a transistor, 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.

[0101] Optional, such as Figure 4 As shown, the third port protection module 10323 may 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 to the second end of the second conduction control module 10322 and the second end of the third protection control circuit 1033, respectively, the negative electrode of the third diode D5 is electrically connected to the second end of the first protection control circuit 1031 and the first end of the seventh resistor R22, respectively, the first end of the sixth resistor R21 is electrically connected to the third end of the second conduction control module 10322, and the second end of the sixth resistor R21 is used to electrically connect the second end of the seventh resistor R22, the fourth end of the second protection control circuit 1032 and the negative electrode of the output end.

[0102] It can be seen that by setting a second port protection module in the second protection control circuit, it is possible to ensure unidirectional current flow and stabilize the circuit, thereby improving circuit stability and circuit safety; and, by setting a second conduction control module in the second protection control circuit, it is possible to improve the control efficiency and control convenience of controlling the on / off state of the second protection control circuit, thereby improving the control efficiency and control convenience of the on / off state of the third protection control circuit, which is beneficial to improving the output accuracy of the detection voltage value of the protection logic control circuit, and further beneficial to improving the accuracy of the main control circuit's judgment on the current state of battery usage, and further beneficial to improving the control accuracy of the battery's charge and discharge state at the battery positive electrode; and, by setting a third port protection module in the second protection control circuit, it is possible to ensure unidirectional current flow and stabilize the circuit while playing a role of current limiting, thereby further improving circuit stability and circuit safety.

[0103] In this optional embodiment, optionally, the third protection control circuit 1033 includes a third conduction control module 10331 and a current limiting module 10332, wherein:

[0104] The first end of the third conduction control module 10331 is electrically connected to the second end of the clamping circuit 1034 and the third end of the first protection control circuit 1031 respectively, the second end of the third conduction control module 10331 is electrically connected to the first end of the current limiting module 10332, the second end of the current limiting module 10332 is electrically connected to the second end of the second protection control circuit 1032, and the third end of the third conduction control module 10331 is used to electrically connect the third end of the third protection control circuit 1033 and the negative pole of the output end.

[0105] Optional, such as Figure 4 As shown, the third conduction control module 10331 may include a third switching device Q7 and an eighth resistor R18, wherein: the first end of the third switching device Q7 is electrically connected to the second end of the clamping circuit 1034 and the third end of the first protection control circuit 1031, respectively, the second end of the third switching device Q7 is electrically connected to the first end of the eighth resistor R18 and the first end of the current limiting module 10332, and the third end of the third switching device Q7 is used to electrically connect the second end of the eighth resistor R18, the third end of the third protection control circuit 1033 and the negative pole of the output terminal.

[0106] Further optionally, the third switching device Q7 can be a transistor or other electronic component that can play a conduction control role, which is not limited in the embodiment of the present application; further optionally, the third switching device Q7 can be an NPN transistor, which is not limited in the embodiment of the present application; wherein, when the third switching device Q7 is a transistor, 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.

[0107] Optional, such as Figure 4 As shown, the current limiting module 10332 may include a ninth resistor R20 , wherein: a first end of the ninth resistor R20 is electrically connected to a second end of the third conduction control module 10331 , and a second end of the ninth resistor R20 is electrically connected to a second end of the second protection control circuit 1032 .

[0108] It can be seen that by setting a third conduction control module in the third protection control circuit, the control efficiency and convenience of controlling the on / off state of the third protection control circuit can be improved, which is beneficial to improving the output accuracy of the detection voltage value of the protection logic control circuit, and then it is beneficial to improve the accuracy of the main control circuit's judgment on the current state of battery usage, and then it is beneficial to improve the control accuracy of the charging and discharging state of the battery at the positive electrode of the battery; and, by setting a current limiting module in the third protection control circuit, the signal input to the third protection control circuit when the second protection control module is in the on state can play a current limiting role, thereby protecting the third conduction control module for normal use, and then further improving the circuit stability and circuit safety.

[0109] In another optional embodiment, Figure 2 As shown, the charge and discharge control circuit 102 may include a drive circuit 1021 and a charge and discharge circuit 1022, wherein:

[0110] The first end of the driving circuit 1021 is electrically connected to the first end of the main control circuit 101, and the second end of the driving circuit 1021 is electrically connected to the second end of the main control circuit 101; the third end of the driving circuit 1021 is electrically connected to the first end of the charging and discharging circuit 1022, and the fourth end of the driving circuit 1021 is electrically connected to the second end of the charging and discharging circuit 1022; the fifth end of the driving circuit 1021 and the third end of the charging and discharging circuit 1022 are respectively used to electrically connect to the positive electrode of the battery; the sixth end of the driving circuit 1021 and the fourth end of the charging and discharging circuit 1022 are respectively used to electrically connect to the positive electrode of the output terminal;

[0111] The driving circuit 1021 is used to output a driving signal to the charging and discharging circuit 1022 according to the control signal output by the main control circuit 101, so as to control the charging and discharging circuit 1022 to be turned on or off.

[0112] Optionally, the above description of the driving circuit 1021 and the charging and discharging circuit 1022 may be specifically as follows:

[0113] The driving circuit 1021 is used to generate a driving signal corresponding to the control signal according to the received control signal, and output the driving signal to the charging and discharging circuit 1022;

[0114] The charge and discharge circuit 1022 is used to control the charge and discharge circuit 1022 to be turned on or off based on the received driving signal.

[0115] It can be seen that by setting a driving circuit in the charge and discharge control circuit, the control signal output by the main control circuit can be processed, and a more stable and accurate driving signal can be output to the charge and discharge circuit, which can improve the signal output accuracy and output stability, thereby improving the driving reliability and control reliability of the charge and discharge circuit, and then improving the control reliability of whether the positive electrode of the battery can be charged and discharged, thereby further improving the timeliness of battery protection and the timeliness of releasing protection, thereby improving the reliability of battery protection.

[0116] In this optional embodiment, optionally, as Figure 2 As shown, the charge and discharge circuit 1022 includes a discharge control module 10221 and a charge control module 10222, wherein:

[0117] The first end of the discharge control module 10221 is electrically connected to the third end of the drive circuit 1021, the first end of the charge control module 10222 is electrically connected to the fourth end of the drive circuit 1021, the second end of the discharge control module 10221 is electrically connected to the second end of the charge control module 10222, the third end of the discharge control module 10221 and the fifth end of the drive circuit 1021 are respectively used to electrically connect to the positive electrode of the battery; the third end of the charge control module 10222 and the sixth end of the drive circuit 1021 are respectively used to electrically connect to the positive electrode of the output terminal;

[0118] The discharge control module 10221 is used to control the battery to discharge to the load when the driving signal controls the discharge control module 10221 to be turned on;

[0119] The charging control module 10222 is used to control the power supply to charge the battery when the driving signal controls the charging control module 10222 to be turned on.

[0120] Optional, such as Figure 3 As shown, the discharge control module 10221 may include a discharge MOS tube, wherein: the first end of the discharge MOS tube is electrically connected to the third end of the drive circuit 1021, the second end of the discharge MOS tube is electrically connected to the second end of the charging control module 10222, and the third end of the discharge MOS tube is used to electrically connect to the positive electrode of the battery.

[0121] Further optionally, the discharge MOS tube may be a PMOS. When the discharge MOS tube is a PMOS, the first end of the discharge MOS tube may be a gate (G), the second end of the discharge MOS tube may be a drain (D), and the third end of the discharge MOS tube may be a source (S).

[0122] Optional, such as Figure 3As shown, the charging control module 10222 may include a charging MOS tube, wherein: the first end of the charging MOS tube is electrically connected to the fourth end of the driving circuit 1021, the second end of the charging MOS tube is electrically connected to the second end of the discharge control module 10221, and the third end of the charging MOS tube is used to electrically connect to the positive electrode of the output end.

[0123] Further optionally, the charging MOS tube may be a PMOS. When the charging MOS tube is a PMOS, the first end of the charging MOS tube may be a gate (G), the second end of the charging MOS tube may be a drain (D), and the third end of the charging MOS tube may be a source (S).

[0124] It can be seen that by setting a charging control module and a discharging control module in the charging and discharging circuit, the driving signal can flexibly and accurately control the conduction / cutoff of the two modules, which can improve the control flexibility and control accuracy of whether the battery can be charged / discharged, thereby improving the battery protection efficiency and protection reliability, which is beneficial to further improve the safety of battery use.

[0125] The working principle of the protection circuit applied to the positive electrode of the battery in the embodiment of the present application is as follows:

[0126] by Figure 4 Take the example of the present invention to explain the working principle of the present invention: the battery positive electrode protection scheme of the present invention adopts a negative electrode protection IC, builds a driving circuit to control the charging PMOS / discharging PMOS in the main circuit, and is provided with a protection logic control circuit to realize the protection state release function. Among them, when the battery is in different states, the control logic of the protection logic control is as follows:

[0127] (1) Initial power-on status:

[0128] When the battery connected to the present solution is powered on for the first time, there is no voltage at the output terminals P+ and P-, and the output voltage V OUT =0V; at this time, in the protection logic control circuit, transistors Q9 and Q7 are in the cut-off state, transistor Q8 is in the on state, VM is pulled up to the positive electrode B+ of the battery through the resistor, V VM =V BAT -0.7V>V LD (V BAT is the battery voltage, V LD is the load detection voltage); the negative electrode protection IC believes 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;

[0129] (2) Charging activation status:

[0130] When the battery electrically connected in this solution is connected to the charger for the first time, there is voltage at the output terminals P+ and P-, and the output voltage VOUT =V MAX (V MAX is the full charge voltage of the battery); in the protection logic control circuit, transistors Q9 and Q7 are turned from the cut-off state to the on state; to prevent transistor Q8 from being still in the on state, so that the battery discharges through the resistor to increase the self-consumption of power, or even cause the battery to appear 0V, a voltage regulator diode D6 is introduced into the circuit; when V OUT <V BAT -V Z When (V Z =The Zener voltage of the voltage-stabilizing diode) will cause the transistor Q8 to be in the on state; due to the presence of the voltage-stabilizing diode D6, the transistor Q8 is turned from the on state to the off state, and VM is pulled down to P- through the resistor, V VM =0V <V CHG_RM (V CHG_RM Remove the detection voltage for the charger); the negative electrode protection IC thinks that the output end is connected to the charger at this time, and controls the discharge MOS to change from the off state to the on state;

[0131] (3) Overcharge protection status:

[0132] When the overcharge protection is triggered, the negative electrode 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 MOS); at this time, transistors Q9 and Q7 in the protection logic control circuit are in the on state; due to the existence of the voltage stabilizing diode D6, transistor Q8 is in the off state, VM is pulled down to P-, V VM =0V <V CHG_RM ; The negative electrode protection IC believes that the output terminal is connected to a charger at this time, and the overcharge protection release condition is not met. It is necessary to discharge the battery cell voltage to reduce it to less than the overcharge release voltage before recovery;

[0133] (4) Over-discharge protection status:

[0134] When the over-discharge protection is triggered, the cathode protection IC controls the discharge MOS to switch from the on state to the off state; after entering the over-discharge protection state, there is no voltage at the output terminals P+ and P-, and V OUT =0V; at this time, transistors Q9 and Q7 in the protection logic control circuit are in the cut-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 thinks that the output terminal is connected to a load at this time, and the over-discharge protection release condition is not met; Connect a charger in the over-discharge protection state, and V OUT =V BAT +V SD , transistors Q9 and Q7 change from off state to on state, transistor Q8 changes from on state to off state, VM is pulled down to P-, V VM =0V <V CHG_RM ; The negative electrode protection IC believes that the output terminal is connected to the charger at this time, which meets the over-discharge protection release condition, and controls the discharge MOS to change from the off state to the on state;

[0135] (5) Discharge overcurrent protection status:

[0136] When the discharge overcurrent protection is triggered, the negative electrode protection IC controls the discharge MOS to switch from the on state to the off state; after entering the discharge overcurrent protection state, there is no voltage at the output terminals P+ and P-, and V OUT =0V; at this time, transistors Q9 and Q7 in the protection logic control circuit are in the cut-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 thinks that the output terminal is connected to a load at this time, and the discharge overcurrent protection release condition is not met; Connect a charger in the discharge overcurrent protection state, and V OUT =V BAT +V SD , transistors Q9 and Q7 change from off state to on state, and transistor Q8 changes from on state to off state; VM is pulled down to P-, V VM =0V <V LD ; The negative electrode protection IC believes that the output end is not connected to the load at this time, and the discharge overcurrent protection release condition is met, and the discharge MOS is controlled to change from the off state to the on state;

[0137] (6) Charging overcurrent protection status:

[0138] When the charging overcurrent protection is triggered, the negative electrode protection IC controls the charging MOS and the discharging MOS to switch from the on state to the off state; when the charger is not unplugged, there is voltage at the output terminals P+ and P-, V OUT =V MAX At this time, transistors Q9 and Q7 in the protection logic control circuit are in the on state, transistor Q8 is in the off state, VM is pulled down to P-, V VM =0V <V CHG_RM ; The negative electrode protection IC believes that the output terminal is connected to the charger at this time, which does not meet the charging overcurrent protection release conditions; when the charger is unplugged, there is no voltage at the output terminals P+ and P-, V OUT=0V; transistors Q9 and Q7 change from on to off, transistor Q8 changes from off to on, VM is pulled up to B+, V VM =V BAT -0.7V>V CHG_RM ; The negative electrode protection IC believes that the output end is not connected to the charger at this time, which meets the conditions for releasing the charging overcurrent protection, and controls the charging MOS and the discharging MOS from the off state to the on state;

[0139] (7) Charger reverse connection protection status:

[0140] When no protection function is triggered and the system is in normal working state, there is voltage at the output terminals P+ and P-, V OUT =V BAT At this time, transistors Q9 and Q7 in the protection logic control circuit are in the on state, transistor Q8 is in the off state, VM is pulled down to P-, V VM =0V; the charger reverse contact discharge overcurrent protection function; after entering the discharge overcurrent protection state, the output voltage V OUT =-V MAX At this time, transistors Q9 and Q7 are in the cut-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 thinks that the output terminal is connected to a load at this time, and the discharge overcurrent protection release condition is not met; when the charger is unplugged, the output voltage V OUT =0V, at this time, the states of transistors Q9, Q7, and Q8 remain unchanged, VM is still pulled up to B+ through the resistor, V VM =V BAT -0.7V>V LD , the negative protection IC thinks that the output terminal is connected to a load at this time, and the discharge overcurrent protection release condition is not met; when the charger is correctly connected, the output voltage V OUT =V MAK At this time, transistors Q9 and Q7 change from the off state to the on state, and transistor Q8 changes from the on state to the off state, VM is pulled down to P-, V VV =0V <V LD The negative electrode protection IC considers that the output terminal is not connected to the load at this time, and the discharge overcurrent protection release condition is met, and controls the discharge MOS to change from the off state to the on state.

[0141] Embodiment 2

[0142] See also Figure 5 , Figure 5 The embodiment disclosed in this application Figure 5 : is a flow chart of a protection method for a positive electrode of a battery disclosed in an embodiment of the present application. Figure 5 The described protection method applied to the positive electrode of the battery can be applied to the protection circuit applied to the positive electrode of the battery, and the protection circuit applied to the positive electrode of the battery may include a main control circuit, a charge and discharge control circuit and a protection logic control circuit; further, the protection circuit applied to the positive electrode of the battery can be applied to the circuit using the battery for charging / discharging, and can also be applied to the BMS (Battery Management System), which is not limited in the embodiments of the present application; wherein: the first end of the main control circuit is electrically connected to the first end of the charge and discharge control circuit, the second end of the main control circuit is electrically connected to the second end of the charge and discharge control circuit, the third end of the main control circuit is electrically connected to the first end of the protection logic control circuit, and the fourth end of the main control circuit is used to electrically connect the negative electrode of the battery and to ground; the fifth end of the main control circuit, the third end of the charge and discharge control circuit and the second end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the battery; the fourth end of the charge and discharge control circuit and the third end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the output terminal; the sixth end of the main control circuit and the fourth end of the protection logic control circuit are used to electrically connect the negative electrode of the output terminal. Figure 5 As shown, the protection method applied to the positive electrode of the battery may include the following operations:

[0143] 201. The protection logic control circuit controls multiple 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 terminal, so as to output the detection voltage value to the main control circuit.

[0144] 202. The main control circuit detects the detection voltage value output by the protection logic control circuit; determines the current state of the battery according to the detection voltage value; and outputs a control signal corresponding to the current state to the charge and discharge control circuit according to the current state.

[0145] In an embodiment of the present application, the current state includes at least one of a battery connection state, an activation state, a protection state, and a protection release state; optionally, the battery connection state may include a load connection state or a charger connection state, the activation state includes an initial power-on state or a charging activation state, and the protection state includes one of an overcharge protection state, an over-discharge protection state, a discharge overcurrent protection state, a charge overcurrent protection state, and a charger reverse connection protection state, which is not limited in the embodiment of the present application.

[0146] 203. The charge and discharge control circuit controls the charge and discharge control circuit to be turned on or off according to the received control signal; when the charge and discharge control circuit is turned on, the battery is controlled to discharge to the load or the power supply is controlled to charge the battery.

[0147] It can be seen that the method described in the embodiment 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 according to the battery voltage value of the battery and the output voltage value of the output end through the protection logic control circuit, so as to output the detection voltage value to the main control circuit; detect the detection voltage value output by the protection logic control circuit through the main 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 charge and discharge control circuit according to the current state; wherein the current state includes at least one of the battery connection state, activation state, protection state and protection release state; control the charge and discharge control circuit to be on or off according to the received control signal through the charge and discharge control circuit; when the charge and discharge control circuit is on When the battery is controlled to discharge to the load or the power supply is controlled to charge the battery, the on / off state of the protection logic control circuit can be controlled based on the battery voltage and the output port voltage, so as to determine whether the current state of the battery needs protection by the detection voltage value under different on / off states of the protection logic control circuit, and while improving the accuracy of determining whether the battery is in an activated state, a protected state, or needs to be released from the protection state, the battery positive electrode is controlled to be chargeable and dischargeable, so as to efficiently protect the battery positive electrode, thereby improving the timeliness of battery protection and the timeliness of release of protection, and further improving the reliability of battery protection, which is conducive to timely stopping the use of the battery in the case of safety risks and timely re-allowing the use of the battery when the safety risks are removed, and further conducive to improving the safety of battery use.

[0148] In an optional embodiment, the protection logic control circuit may include a first protection control circuit, a second protection control circuit and a third protection control circuit, wherein: the first end of the first protection control circuit is used to electrically connect to the positive electrode of the battery, the second end of the first protection control circuit is electrically connected to the first end of the second protection control circuit, the third end of the first protection control circuit is electrically connected to the first end of the third protection control circuit and the third end of the main control circuit respectively; the second end of the second protection control circuit is electrically connected to the second end of the third protection control circuit; the third end of the second protection control circuit is used to electrically connect to the positive electrode of the output terminal; the fourth end of the second protection control circuit and the third end of the third protection control circuit are respectively used to electrically connect to the negative electrode of the output terminal;

[0149] When the output voltage value of the output terminal meets the preset conduction condition, the first protection control circuit is controlled to be turned on, and the first voltage value is output to the main control circuit as the detection voltage value, wherein the first voltage value is determined based on the battery voltage value and the first preset voltage value; when the output voltage value does not meet the conduction condition, the first protection control circuit is turned off;

[0150] When the output voltage value meets the conduction condition, the second protection control circuit is controlled to be turned off; when the output voltage value does not meet the conduction condition, the second protection control circuit is controlled to be turned on;

[0151] When the second protection control circuit is in the on state, the third protection control circuit is controlled to be on, and the second voltage value is output to the main control circuit as the detection voltage value, wherein the second voltage value is the voltage value of the negative pole of the output terminal; when the second protection control circuit is in the off state, the third protection control circuit is controlled to be off.

[0152] It can be seen that this optional embodiment can determine whether the output voltage value meets the conduction condition by setting three protection control circuits in the protection logic control circuit, and choose to turn on the first protection control circuit, or turn on the second protection control circuit and the third protection control circuit under different judgment results, so that the main control circuit can detect different detection voltage values ​​based on different circuit conduction conditions, thereby improving the circuit conduction control flexibility and control efficiency of the protection logic control circuit, so as to flexibly and efficiently output the corresponding detection voltage values ​​under different conduction conditions to the main control circuit, which is beneficial to improve the accuracy and efficiency of the main control circuit's judgment on the current state of battery usage.

[0153] In another optional embodiment, the charge and discharge control circuit may include a drive circuit and a charge and discharge circuit, wherein: a first end of the drive circuit is electrically connected to a first end of the main control circuit, and a second end of the drive circuit is electrically connected to a second end of the main control circuit; a third end of the drive circuit is electrically connected to a first end of the charge and discharge circuit, and a fourth end of the drive circuit is electrically connected to a second end of the charge and discharge circuit; a fifth end of the drive circuit and a third end of the charge and discharge circuit are respectively used to electrically connect to a positive electrode of a battery; a sixth end of the drive circuit and a fourth end of the charge and discharge circuit are respectively used to electrically connect to a positive electrode of an output terminal;

[0154] The driving circuit generates a driving signal corresponding to the control signal according to the received control signal, and outputs the driving signal to the charging and discharging circuit;

[0155] The charge and discharge circuit controls the charge and discharge circuit to be turned on or off based on the received driving signal.

[0156] It can be seen that this optional embodiment can, by setting a driving circuit in the charge and discharge control circuit, process the control signal output by the main control circuit, and output a more stable and accurate driving signal to the charge and discharge circuit, thereby improving the signal output accuracy and output stability, thereby improving the driving reliability and control reliability of the charge and discharge circuit, and further improving the control reliability of whether the positive electrode of the battery can be charged and discharged, thereby further improving the timeliness of battery protection and the timeliness of releasing protection, thereby improving the reliability of battery protection.

[0157] In this optional embodiment, optionally, the charge and discharge circuit includes a discharge control module and a charge control module, wherein: the first end of the discharge control module is electrically connected to the third end of the drive circuit, the first end of the charge control module is electrically connected to the fourth end of the drive circuit, the second end of the discharge control module is electrically connected to the second end of the charge control module, the third end of the discharge control module and the fifth end of the drive circuit are respectively used to electrically connect to the positive electrode of the battery; the third end of the charge control module and the sixth end of the drive circuit are respectively used to electrically connect to the positive electrode of the output terminal;

[0158] When the driving signal controls the discharge control module to be turned on, the discharge control module controls the battery to discharge to the load;

[0159] When the driving signal controls the charging control module to be turned on, the charging control module controls the power supply to charge the battery.

[0160] It can be seen that this optional embodiment can also enable the driving signal to flexibly and accurately control the conduction / cutoff of the two modules by setting a charging control module and a discharging control module in the charging and discharging circuit, thereby improving the control flexibility and control accuracy of whether the battery can be charged / discharged, thereby improving the battery protection efficiency and protection reliability, and further helping to further improve the safety of battery use.

[0161] Embodiment 3

[0162] See also Figure 6 , Figure 6 : is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present application, and the electronic device includes a protection circuit applied to the positive electrode of the battery as in any one of the embodiments. And the functions that can be realized 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 positive electrode of the battery. It should be noted that for a detailed description of the protection circuit applied to the positive electrode of the battery, please refer to the specific description of the relevant content in the embodiment one, which will not be repeated in this embodiment.

[0163] It can be seen that the implementation Figure 6The electronic device described can control multiple protection control circuits in the protection logic control circuit to be in the on state / off state respectively according to the battery voltage value of the battery and the output voltage value of the output terminal through the protection logic control circuit, so as to output the detection voltage value to the main control circuit; detect the detection voltage value output by the protection logic control circuit through the main 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 charge and discharge control circuit according to the current state; wherein the current state includes at least one of the battery connection state, activation state, protection state and protection release state; control the charge and discharge control circuit to be on or off according to the received control signal through the charge and discharge control circuit; when the charge and discharge control circuit is on, the control The battery discharges to the load or controls the power supply to charge the battery, and can control the on / off state 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 by the detection voltage value under different on / off states of the protection logic control circuit, and at the same time improve the accuracy of determining whether the battery is in an activated state, a protected state, or needs to be released from the protection state, control whether the battery can be charged and discharged at the positive electrode of the battery to efficiently protect the positive electrode of the battery, thereby improving the timeliness of battery protection and the timeliness of releasing protection, and further improving the reliability of battery protection, which is conducive to stopping the use of the battery in time when there is a safety risk and allowing the battery to be used again in time when the safety risk is lifted, and further helping to improve the safety of battery use.

[0164] The above is a detailed introduction to a protection circuit, method and electronic device applied to the positive electrode of a battery disclosed in an embodiment of the present application. Specific embodiments are used in this article to illustrate the principles and implementation methods of the present application, but the above preferred embodiments are not used to limit the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for a general technician in this field, based on the idea of ​​the present application, there will be changes in the specific implementation method and application scope without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A protection circuit applied to a positive electrode of a battery, characterized in that: The protection circuit (10) applied to the positive electrode of the battery comprises a main control circuit (101), a charge and discharge control circuit (102) and a protection logic control circuit (103), wherein: The first end of the main control circuit (101) is electrically connected to the first end of the charge and discharge control circuit (102), the second end of the main control circuit (101) is electrically connected to the second end of the charge and discharge control circuit (102), the third end of the main control circuit (101) is electrically connected to the first end of the protection logic control circuit (103), and the fourth end of the main control circuit (101) is used to electrically connect to the negative pole of the battery and to be grounded; The fifth end of the main control circuit (101), the third end of the charge and discharge control circuit (102) and the second end of the protection logic control circuit (103) are respectively used to electrically connect to the positive electrode of the battery; the fourth end of the charge and discharge control circuit (102) and the third end of the protection logic control circuit (103) are respectively used to electrically connect to the positive electrode of the output terminal; the sixth end of the main control circuit (101) and the fourth end of the protection logic control circuit (103) are respectively used to electrically connect to the negative electrode of the output terminal; The protection logic control circuit (103) is used to output 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 terminal; The main control circuit (101) is used to determine the current state of the battery according to the detected voltage value, so as to control the charging and discharging control circuit (102) to be turned on or off.

2. The protection circuit for the positive electrode of a battery according to claim 1, characterized in that: The protection logic control circuit (103) comprises a first protection control circuit (1031), a second protection control circuit (1032) and a third protection control circuit (1033), wherein: The first end of the first protection control circuit (1031) is used to electrically connect to the positive electrode of the battery; the second end of the first protection control circuit (1031) is electrically connected to the first end of the second protection control circuit (1032); the third end of the first protection control circuit (1031) is electrically connected to the first end of the third protection control circuit (1033) and the third end of the main control circuit (101) respectively; the second end of the second protection control circuit (1032) is electrically connected to the second end of the third protection control circuit (1033); the third end of the second protection control circuit (1032) is used to electrically connect to the positive electrode of the output terminal; the fourth end of the second protection control circuit (1032) and the third end of the third protection control circuit (1033) are respectively used to electrically connect to the negative electrode of the output terminal; The first protection control circuit (1031) 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 terminal meets a preset conduction condition; The second protection control circuit (1032) is used to control the third protection control circuit (1033) to be turned on when the output voltage value does not meet the conduction condition, so as to output the second voltage value as the detection voltage value to the main control circuit (101).

3. The protection circuit for the positive electrode of a battery according to claim 2, characterized in that: The protection logic control circuit (103) further comprises a clamping circuit (1034), wherein: The first end of the clamping circuit (1034) is electrically connected to the third end of the main control circuit (101), and the second end of the clamping circuit (1034) is electrically connected to the third end of the first protection control circuit (1031) and the first end of the third protection control circuit (1033); The clamping circuit (1034) is used to clamp the detection voltage value at the first voltage value or the second voltage value.

4. The protection circuit for the positive electrode of a battery according to claim 3, characterized in that: The first protection control circuit (1031) comprises a first port protection module (10311), a first conduction control module (10312) and a voltage stabilization module (10313), wherein: The first end of the first port protection module (10311) is used to electrically connect to the positive electrode of the battery, the second end of the first port protection module (10311) is electrically connected to the first end of the first conduction control module (10312), the second end of the first conduction control module (10312) is electrically connected to the first end of the voltage stabilizing module (10313), the third end of the first conduction control module (10312) is electrically connected to the second end of the clamping circuit (1034) and the first end of the third protection control circuit (1033), respectively, and the second end of the voltage stabilizing module (10313) is electrically connected to the first end of the second protection control circuit (1032).

5. The protection circuit for the positive electrode of a battery according to claim 3, characterized in that: The second protection control circuit (1032) comprises a second port protection module (10321), a second conduction control module (10322) and a third port protection module (10323), wherein: The first end of the second port protection module (10321) is used to electrically connect to the positive electrode of the output terminal; the second end of the second port protection module (10321) is electrically connected to the first end of the second conduction control module (10322); the second end of the second conduction control module (10322) is electrically connected to the first end of the third port protection module (10323) and the second end of the third protection control circuit (1033) respectively; the second end of the third port protection module (10323) is electrically connected to the second end of the first protection control circuit (1031); the third end of the second conduction control module (10322) is electrically connected to the second end of the third port protection module (10323); the third end of the third port protection module (10323) and the fourth end of the third port protection module (10323) are used to electrically connect to the fourth end of the second protection control circuit (1032) and the negative electrode of the output terminal respectively.

6. The protection circuit for the positive electrode of a battery according to claim 3, characterized in that: The third protection control circuit (1033) comprises a third conduction control module (10331) and a current limiting module (10332), wherein: The first end of the third conduction control module (10331) is electrically connected to the second end of the clamping circuit (1034) and the third end of the first protection control circuit (1031), respectively; the second end of the third conduction control module (10331) is electrically connected to the first end of the current limiting module (10332); the second end of the current limiting module (10332) is electrically connected to the second end of the second protection control circuit (1032); and the third end of the third conduction control module (10331) is used to electrically connect the third end of the third protection control circuit (1033) and the negative electrode of the output end.

7. The protection circuit for a positive electrode of a battery according to any one of claims 1 to 6, characterized in that: The charge and discharge control circuit (102) comprises a drive circuit (1021) and a charge and discharge circuit (1022), wherein: The first end of the drive circuit (1021) is electrically connected to the first end of the main control circuit (101), and the second end of the drive circuit (1021) is electrically connected to the second end of the main control circuit (101); the third end of the drive circuit (1021) is electrically connected to the first end of the charge and discharge circuit (1022), and the fourth end of the drive circuit (1021) is electrically connected to the second end of the charge and discharge circuit (1022); the fifth end of the drive circuit (1021) and the third end of the charge and discharge circuit (1022) are respectively used to electrically connect to the positive electrode of the battery; the sixth end of the drive circuit (1021) and the fourth end of the charge and discharge circuit (1022) are respectively used to electrically connect to the positive electrode of the output end; The driving circuit (1021) is used to output a driving signal to the charging and discharging circuit (1022) according to the control signal output by the main control circuit (101), so as to control the charging and discharging circuit (1022) to be turned on or off.

8. The protection circuit for the positive electrode of a battery according to claim 7, characterized in that: The charge and discharge circuit (1022) comprises a discharge control module (10221) and a charge control module (10222), wherein: The first end of the discharge control module (10221) is electrically connected to the third end of the drive circuit (1021), the first end of the charge control module (10222) is electrically connected to the fourth end of the drive circuit (1021), the second end of the discharge control module (10221) is electrically connected to the second end of the charge control module (10222), the third end of the discharge control module (10221) and the fifth end of the drive circuit (1021) are respectively used to electrically connect to the positive electrode of the battery; the third end of the charge control module (10222) and the sixth end of the drive circuit (1021) are respectively used to electrically connect to the positive electrode of the output end.

9. A protection method for a positive electrode of a battery, characterized in that: The method is applied to a protection circuit for a positive electrode of a battery, wherein the protection circuit comprises a main control circuit, a charge and discharge control circuit and a protection logic control circuit, wherein: The first end of the main control circuit is electrically connected to the first end of the charge and discharge control circuit, the second end of the main control circuit is electrically connected to the second end of the charge and discharge control circuit, the third end of the main control circuit is electrically connected to the first end of the protection logic control circuit, and the fourth end of the main control circuit is used to electrically connect the negative electrode of the battery and to ground; The fifth end of the main control circuit, the third end of the charge and discharge control circuit and the second end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the battery; the fourth end of the charge and discharge control circuit and the third end of the protection logic control circuit are respectively used to electrically connect the positive electrode of the output terminal; the sixth end of the main control circuit and the fourth end of the protection logic control circuit are used to electrically connect the negative electrode of the output terminal; The method comprises: The protection logic control circuit controls the multiple 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 the detection voltage value to the main control circuit; The main control circuit detects the detection voltage value output by the protection logic control circuit; determines the current state of the battery according to the detection voltage value; and outputs a control signal corresponding to the current state to the charge and discharge control circuit according to the current state; The charge and discharge control circuit controls the charge and discharge control circuit to be turned on or off according to the received control signal; when the charge and discharge control circuit is turned on, the battery is controlled to discharge to the load or the power supply is controlled to charge the battery.

10. An electronic device, characterized in that: The electronic device comprises a device body and a protection circuit applied to a positive electrode of a battery as described in any one of claims 1 to 8.

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