Control circuit, battery management system, distribution box, battery pack and electric energy equipment

Abstract

The utility model discloses a control circuit, a battery management system, a distribution box, a battery pack and electric energy equipment. The control circuit comprises a first signal unit, a second signal unit, a third signal unit, a time delay circuit and a skipping time delay circuit. The first signal unit is used for determining a first control signal; the second signal unit is used for outputting a first enable signal; the third signal unit is used for determining a discharging signal and a charging signal; the time delay circuit is electrically connected with the first signal unit and the second signal unit; the skipping delay circuit is electrically connected with the first signal unit, the second signal unit and the third signal unit; when the first signal unit determines a first control signal and the third signal unit determines a discharge signal, the time delay circuit controls the second signal unit to output a first enable signal after a preset duration; when the first signal unit determines a first control signal and the third signal unit determines a charging signal, the skipping delay circuit controls the second signal unit to output a first enable signal.

Description

Technical Field

[0001] The present application relates to the field of electricity, and more specifically to a control circuit, a battery management system, a distribution box, a battery pack and an electric energy device. Background Art

[0002] During the use of electric vehicles, energy is stored by charging the battery, and the battery is discharged to drive the battery vehicle. The control scheme of battery charging and discharging in related technologies may cause battery safety issues. Utility Model Content

[0003] The utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a control circuit for controlling a control switch of a battery is provided, the control circuit comprising: a first signal unit, a second signal unit, a third signal unit, a delay circuit and a skip delay circuit; wherein the first signal unit is used to determine a first control signal, the first control signal is used to control the control switch to be disconnected; the second signal unit is used to output a first enable signal, the first enable signal is used to enable the control switch to be disconnected; the third signal unit is used to determine a discharge signal and a charge signal; the delay circuit is electrically connected to the first signal unit and the second signal unit; the skip delay circuit is electrically connected to the first signal unit, the second signal unit and the third signal unit; when the first signal unit determines the first control signal and the third signal unit determines the discharge signal, the delay circuit controls the second signal unit to output the first enable signal after a preset time; when the first signal unit determines the first control signal and the third signal unit determines the charge signal, the skip delay circuit controls the second signal unit to output the first enable signal.

[0004] In one embodiment of the present application, the first signal unit is also used to determine a second control signal, and the second control signal is used to control the control switch to be turned on; the second signal unit is also used to output a second enable signal, and the second enable signal is used to enable the control switch to be turned on; wherein, when the first signal unit determines the second control signal, the delay circuit controls the second signal unit to output the second enable signal.

[0005] In one embodiment of the present application, the skip delay circuit includes: a first input terminal, a second input terminal and a first output terminal; the first input terminal is electrically connected to the first signal unit; the second input terminal is electrically connected to the third signal unit; the first output terminal is electrically connected to the second signal unit; wherein, when the first signal unit inputs the first control signal through the first input terminal, and the third signal unit inputs the charging signal through the second input terminal, the first output terminal outputs the first enable signal to the second signal unit; when the first signal unit inputs the second control signal through the first input terminal, and / or the third signal unit inputs the discharge signal through the second input terminal, the first output terminal outputs a high-impedance state to the second signal unit.

[0006] In one embodiment of the present application, the delay circuit includes: a third input terminal and a second output terminal; the third input terminal is electrically connected to the first signal unit; the second output terminal is electrically connected to the second signal unit; wherein, when the first signal unit inputs the first control signal through the third input terminal, and the third signal unit inputs the discharge signal through the second input terminal, the second output terminal outputs the first enable signal to the second signal unit after the preset time length; when the first signal unit inputs the second control signal through the third input terminal, the second output terminal outputs the second enable signal to the second signal unit.

[0007] In one embodiment of the present application, the skip delay circuit includes: a first switch, a first switch branch, and a second switch branch; wherein the first end of the first switch is electrically connected to the first output end, and the second end of the first switch is grounded; the first switch branch is electrically connected to the first input end and the control end of the first switch, and is used to control the first switch to be disconnected when the second control signal is input to the first input end, so that the first output end outputs the high-impedance state; the second switch branch is electrically connected to the second input end and the control end of the first switch, and is used to control the first switch to be disconnected when the discharge signal is input to the second input end, so that the first output end outputs the high-impedance state; and the first switch branch and the second switch branch are also used to: when the first control signal is input to the first input end and the charging signal is input to the second input end, control the first switch to be turned on, so that the first output end outputs the first enable signal.

[0008] In one embodiment of the present application, the first switch branch is also grounded; when the second control signal is input to the first input end, the control end of the first switch is grounded through the first switch branch to disconnect the first switch; the second switch branch is also grounded; when the discharge signal is input to the second input end, the control end of the first switch is grounded through the second switch branch to disconnect the first switch.

[0009] In one embodiment of the present application, the first switch is an NMOS switch tube or a PNP transistor.

[0010] In one embodiment of the present application, the second switch branch includes: a second switch, a first end of the second switch is electrically connected to the control end of the first switch, and a second end of the second switch is grounded; when the discharge signal is input to the second input end, the second switch is turned on so that the control end of the first switch is grounded through the second switch.

[0011] In one embodiment of the present application, the first switch branch is also electrically connected to a reference voltage terminal; when the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, the second switch is disconnected, the control terminal of the first switch is electrically connected to the reference voltage terminal through the first switch branch, and the first switch is turned on, so that the first output terminal outputs the first enable signal.

[0012] In one embodiment of the present application, the second switch branch further includes: a third switch, a first end of the third switch electrically connected to the control end of the second switch and the reference voltage end, a second end of the third switch grounded, and a control end of the third switch electrically connected to the second input end; when the discharge signal is input to the second input end, the third switch is disconnected, the reference voltage end and the control end of the second switch are connected to turn on the second switch; when the charging signal is input to the second input end, the third switch is turned on, and the control end of the second switch is grounded through the third switch to disconnect the second switch.

[0013] In one embodiment of the present application, the second switch is an NMOS switch tube or a PNP transistor.

[0014] In one embodiment of the present application, the third switch is an NMOS switch tube or a PNP transistor, the charging signal is a high-level signal, and the discharging signal is a low-level signal.

[0015] In one embodiment of the present application, the second switch branch also includes: a first resistor, a second resistor and a third resistor; wherein the first end of the first resistor is electrically connected to the reference voltage end, the second end of the first resistor is electrically connected to the first end of the third switch and the control end of the second switch; the first end of the second resistor is electrically connected to the second input end, the second end of the second resistor is electrically connected to the first end of the third resistor and the control end of the third switch, and the second end of the third resistor is grounded.

[0016] In one embodiment of the present application, the first switch branch includes: a fourth switch, a first end of the fourth switch is electrically connected to the reference voltage end and the control end of the first switch, a second end of the fourth switch is grounded, and the control end of the fourth switch is electrically connected to the first input end; when the first control signal is input to the first input end, the fourth switch is disconnected, and the reference voltage end is electrically connected to the control end of the first switch to turn on the first switch; when the second control signal is input to the first input end, the fourth switch is turned on, and the control end of the first switch is grounded through the fourth switch to turn off the first switch.

[0017] In one embodiment of the present application, the fourth switch is an NMOS switch tube or a PNP transistor, the first control signal is a low-level signal, and the second control signal is a high-level signal.

[0018] In one embodiment of the present application, the first switch branch also includes: a fourth resistor, a fifth resistor and a sixth resistor; the first end of the fourth resistor is electrically connected to the reference voltage end, the second end of the fourth resistor is electrically connected to the first end of the fourth switch and the control end of the first switch; the first end of the fifth resistor is electrically connected to the first input end, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the control end of the fourth switch, and the second end of the sixth resistor is grounded.

[0019] In one embodiment of the present application, at least one of the first signal unit, the second signal unit and the third signal unit is a pin.

[0020] According to a second aspect of the present application, a battery management system is further provided, the battery management system comprising: any one of the control circuits described above for controlling a control switch of a battery.

[0021] According to a third aspect of the present application, a distribution box is also provided, and the distribution box includes: any one of the battery management systems described above.

[0022] According to the fourth aspect of the present application, a battery pack is also provided, which includes: a battery, a control switch, a driving chip and any one of the above-mentioned distribution boxes; the control switch is used to control the battery; the driving chip electrically connects the control switch and the second signal unit, and the driving chip is used to control the control switch to disconnect according to the first enable signal output by the second signal unit.

[0023] According to the fifth aspect of the present application, an electric energy device is also provided, which includes: a control circuit for controlling a control switch of a battery as described in any one of the above, a battery management system as described in any one of the above, a distribution box as described in any one of the above, or a battery pack as described in any one of the above.

[0024] According to the control circuit, battery management system, distribution box, battery pack and electric energy equipment provided in the present application, by setting a third signal unit and skipping the delay circuit, it is possible to distinguish different operating conditions of charging and discharging, so that different processing methods can be adopted in different operating conditions; and when the first signal unit determines the first control signal and the third signal unit determines the charging signal, the skip delay circuit controls the second signal unit to output the first enable signal so that the control switch is immediately disconnected to prevent the battery from overcharging and ensure the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic block diagram of a battery control circuit according to an embodiment of the present utility model;

[0027] Figure 2 A circuit diagram of a battery control circuit according to an embodiment of the present utility model;

[0028] Figure 3 This is a circuit diagram of a battery control circuit according to another embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0030] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0031] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0032] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0033] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] In the related art, no matter the power battery is in the process of charging or discharging, when the main control MCU (Microcontroller Unit, microcontroller, the main chip in BMS, monitors and processes the information of each functional module of BMS, and plays the role of central control) of BMS (Battery Management System, a management system for lithium batteries of electric vehicles, monitors and manages the status of automobile batteries, and ensures the safety of the whole vehicle) is abnormally reset, the high-voltage contactor that controls the conduction and disconnection between the battery and the outside will be disconnected with a delay. During the charging process of the power battery, if the MCU is abnormally reset, the real-time state parameters of the battery are lost. The delayed disconnection of the high-voltage contactor will cause the power battery to continue to charge for a certain period of time, which may cause the battery to be overcharged and cause battery safety problems. That is, in the related art, when the main control MCU of the BMS is abnormally reset during the charging or discharging process of the power battery, the high-voltage contactor will be disconnected with a delay, and it is not processed according to the working conditions. The above-mentioned technical problems existing in the related art can be solved by the technical solutions shown in some embodiments of the present application.

[0035] The present application embodiment provides a control circuit for controlling a control switch of a battery, referring to Figure 1 and Figure 2 , the control circuit includes: a first signal unit, a second signal unit, a third signal unit, a delay circuit and a skip delay circuit; wherein the first signal unit is used to determine a first control signal, the first control signal is used to control the control switch to be disconnected; the second signal unit is used to output a first enable signal, the first enable signal is used to enable the control switch to be disconnected; the third signal unit is used to determine a discharge signal and a charge signal; the delay circuit is electrically connected to the first signal unit and the second signal unit; the skip delay circuit is electrically connected to the first signal unit, the second signal unit and the third signal unit; when the first signal unit determines the first control signal and the third signal unit determines the discharge signal, the delay circuit controls the second signal unit to output the first enable signal after a preset time length; when the first signal unit determines the first control signal and the third signal unit determines the charge signal, the skip delay circuit controls the second signal unit to output the first enable signal.

[0036] In the above scheme, by setting the third signal unit and skipping the delay circuit, it is possible to distinguish different working conditions of charging and discharging, so that different processing methods can be used in different working conditions; and when the first signal unit determines the first control signal and the third signal unit determines the charging signal, the skip delay circuit controls the second signal unit to output the first enable signal to immediately disconnect the control switch to prevent the battery from overcharging and ensure the safety of the battery. That is, in this application, when the first control signal that controls the control switch to disconnect is received under the charging condition, the processing method is to immediately power off to prevent the battery from overcharging and ensure the safety of the battery. The above structures are described in detail below in conjunction with the accompanying drawings.

[0037] For the settings of the first signal unit, refer to Figure 1 and Figure 2 , the first signal unit is used to determine the first control signal, and the first control signal is used to control the control switch to be disconnected, that is, the first control signal can be a control signal for controlling the control switch to be disconnected of the battery. Of course, the first control signal can also be other control signals that include enabling the control switch to be disconnected, that is, as long as the control signal includes an instruction to disconnect the control switch, it belongs to the protection scope of the first control signal in the embodiment of the present application. For example, the first control signal can also be a first control signal generated based on a wake-up signal in the process of waking up the main control MCU in the BMS. Exemplarily, the first signal unit can be a pin. Of course, in other embodiments, the first signal unit can also be a signal transmission unit such as but not limited to a wireless or contactless signal transmission unit, that is, as long as the method of determining the first control signal is within the protection scope of the present utility model.

[0038] In some embodiments, reference Figure 1 and Figure 2 , the first signal unit is also used to determine the second control signal. The second control signal is used to control the conduction of the control switch, that is, the second control signal can be a control signal for controlling the conduction of the control switch of the battery. Of course, it can also be other control signals that enable the control switch to be turned on, that is, as long as the control signal contains an instruction to turn on the control switch, it belongs to the protection scope of the second control signal in the embodiment of the present application. It should be explained that the way in which the first signal unit determines the first control signal and the second control signal can be, for example, but not limited to, signals received from other modules or signals directly generated by the signal unit.

[0039] Exemplary, reference Figure 1 and Figure 2, the first signal unit can be connected to the main control MCU in the BMS, and can even be connected to the SBC (System Basis Chip, a system basis chip, which is an independent chip that includes power supply, communication, monitoring diagnosis, safety monitoring and other features as well as GPIO) chip in the BMS. When the first signal unit is a pin, the first signal unit can be a variety of types of pins. Exemplarily, the first signal unit can be a PORST pin, or a pin connected by circuits such as but not limited to latching and unlocking. Among them, PORST is a hard-line reset signal of the main control MCU, which is reset and output by the SBC chip, outputs the second control signal during normal operation, and outputs the first control signal during reset. The first control signal and the second control signal can be high-level signals and low-level signals, respectively. Exemplarily, the first control signal can be a low-level signal, and the second control signal can be a high-level signal; or, the first control signal can be a high-level signal, and the second control signal can be a low-level signal.

[0040] For the setting of the second signal unit, refer to Figure 1 and Figure 2 , the second signal unit is used to output a first enable signal, and the first enable signal is used to enable the control switch to be disconnected, so that when the second signal unit outputs the first enable signal, the control switch can be disconnected. Exemplarily, the battery can be electrically connected to an external load and a charging device through the control switch in the embodiment of the present application. Exemplarily, the control switch can be a switching device such as but not limited to a contactor, a relay, etc. Exemplarily, the control switch is connected in the charging circuit and the discharging circuit of the battery, and only after the control switch is closed can the battery be connected to the external charging device and the load to charge the battery, or the battery can be discharged to the outside. The second signal unit serves as a signal unit for outputting an enable signal, and the first enable signal outputted by the second signal unit can enable the control switch to be disconnected. Exemplarily, the second signal unit is connected to the driver chip to send a first enable signal to the driver chip, so that the driver chip enables the control switch to be disconnected according to the received first enable signal.

[0041] Exemplary, reference Figure 1 and Figure 2, the second signal unit is also used to output a second enable signal, and the second enable signal is used to enable the control switch to be turned on, so that when the second signal unit outputs the second enable signal, the control switch can be turned on, so that the battery is connected to the external charging device and the load. Exemplarily, when the second signal unit is connected to the driver chip, after the driver chip receives the second enable signal, the control switch is enabled to be turned on. Exemplarily, one of the first enable signal and the second enable signal is a high-level signal, and the other enable signal is a low-level signal. For example, the first enable signal is a low-level signal, and the second enable signal is a high-level signal; or, the first enable signal is a high-level signal, and the second enable signal is a low-level signal.

[0042] Exemplarily, the second signal unit may be a pin, and exemplary, the second signal unit may be an enable pin. Of course, in other embodiments, the second signal unit may also be a signal transmission unit such as but not limited to a wireless or contactless signal transmission unit.

[0043] For the settings of the third signal unit, refer to Figure 1 and Figure 2 The third signal unit is used to determine the charging signal and the discharging signal. Specifically, during the battery charging process, the third signal unit determines the charging signal; during the battery discharging process, the third signal unit determines the discharging signal.

[0044] Exemplarily, the third signal unit may be a pin. Exemplarily, the third signal unit may be a CHARGE pin. Exemplarily, one of the charging signal and the discharging signal is a high-level signal, and the other signal is a low-level signal. For example, the discharging signal is a low-level signal, and the charging signal is a high-level signal; or, the charging signal is a high-level signal, and the discharging signal is a low-level signal. Of course, in other embodiments, the third signal unit may also be a signal transmission unit such as but not limited to wireless or contactless. It should be explained that the way in which the third signal unit determines the discharge signal and the charging signal may be such as but not limited to signals received from other modules or signals directly generated by the signal unit.

[0045] Regarding the setting of the delay circuit, any circuit that can delay the output signal in at least one state can be used. The delay circuit is electrically connected to the first signal unit and the second signal unit. For example, referring to Figure 1 and Figure 2, when the first signal unit determines the first control signal, the delay circuit can control the second signal unit to output the first enable signal after a preset time length, thereby realizing delayed output. The setting of the preset time length is specifically related to the parameters of each device in the extension circuit. When the first signal unit determines the first control signal, the first control signal can control the second signal unit to delay the output of the first enable signal through the delay circuit. Specifically, when the first signal unit determines the first control signal and the third signal unit determines the discharge signal, the delay circuit controls the second signal unit to output the first enable signal after a preset time length, so that the vehicle will not suddenly lose power or lose control during operation to ensure driving safety.

[0046] For the setting of skip delay circuit, refer to Figure 1 and Figure 2 , the skip delay circuit electrically connects the first signal unit, the second signal unit and the third signal unit. When the skip delay circuit is in a certain state, the control signal determined by the first signal unit can be directly output to the second signal unit without being processed by the delay circuit. Exemplarily, when the first signal unit determines the first control signal and the third signal unit determines the charging signal, the skip delay circuit directly controls the second signal unit to output the first enable signal so that the control switch is immediately disconnected to prevent the battery from overcharging and ensure the safety of the battery. That is, in this embodiment, when the first control signal that controls the control switch to disconnect is received under charging conditions, the processing method is to immediately power off to prevent the battery from overcharging and ensure the safety of the battery.

[0047] In some embodiments, reference Figure 1 and Figure 2 When the first signal unit determines the second control signal, the delay circuit controls the second signal unit to output the second enable signal, that is, the second control signal at this time can control the second signal unit to output the second enable signal through the delay circuit. At this time, the delay circuit can be set so that the second control signal controls the second signal unit to output the second enable signal with a delay through the delay circuit, or the second control signal controls the second signal unit to immediately output the second enable signal through the delay circuit, so as to enable the control switch to be turned on, thereby realizing the connection between the battery and the external charging device and load.

[0048] Exemplary, reference Figure 1 and Figure 2The skip delay circuit may include: a first input terminal, a second input terminal and a first output terminal; wherein the first input terminal is electrically connected to the first signal unit; the second input terminal is electrically connected to the third signal unit; the first output terminal is electrically connected to the second signal unit; when the first signal unit inputs a first control signal through the first input terminal and the third signal unit inputs a charging signal through the second input terminal, the first output terminal outputs a first enable signal to the second signal unit; when the first signal unit inputs a second control signal through the first input terminal and / or the third signal unit inputs a discharge signal through the second input terminal, the first output terminal outputs a high impedance state to the second signal unit.

[0049] refer to Figure 1 and Figure 2 , that is, the skip delay circuit includes two input terminals and one output terminal, wherein the two input terminals are respectively a first input terminal and a second input terminal. The first input terminal is electrically connected to the first signal unit, the second input terminal is electrically connected to the third signal unit, and the first output terminal is electrically connected to the second signal unit. When the first signal unit inputs the first control signal and the third signal unit inputs the charging signal, the first input terminal inputs the first control signal and the second input terminal inputs the charging signal, and the first output terminal at this time can output the first enable signal to the second signal unit.

[0050] Exemplary, reference Figure 1 and Figure 2 , when the second control signal is input to the first signal unit, and / or the discharge signal is input to the third signal unit, that is, when the second control signal is input to the first input terminal, and / or when the discharge signal is input to the second input terminal, the first output terminal outputs a high impedance state to the second signal unit. At this time, the first control signal or the second control signal input to the first signal unit can only make the second signal unit output the second enable signal or the first enable signal through the delay circuit. Specifically, when the second control signal is input to the first signal unit, the first output terminal outputs a high impedance state to the second signal unit, and the second control signal input to the first signal unit controls the second signal unit to output the second enable signal through the delay circuit. When the discharge signal is input to the third signal unit, the first output terminal outputs a high impedance state to the second signal unit. At this time, if the first signal unit inputs the first control signal, the first control signal input to the first signal unit can only make the second signal unit output the first enable signal through the delay circuit; if the first signal unit inputs the second control signal, the second control signal input to the first signal unit can only make the second signal unit output the second enable signal through the delay circuit.

[0051] Exemplary, reference Figure 1 and Figure 2, the delay circuit may include: a third input terminal and a second output terminal. The third input terminal is electrically connected to the first signal unit, and the second output terminal is electrically connected to the second signal unit. When the first signal unit inputs the first control signal through the third input terminal, and the third signal unit inputs the discharge signal through the second input terminal, the second output terminal outputs the first enable signal to the second signal unit after a preset time. At this time, the third signal unit inputs the discharge signal through the second input terminal, causing the first output terminal to input a high-impedance state to the second signal unit, and the first control signal input by the first signal unit can only be input to the extension circuit through the third input terminal of the delay circuit, so that the second output terminal of the extension circuit delays the output of the first enable signal to the second signal unit. In this way, during the battery discharge process, the vehicle will not suddenly lose power or lose control when running to ensure driving safety.

[0052] Exemplary, reference Figure 1 and Figure 2 When the first signal unit inputs the second control signal through the third input terminal, the second output terminal outputs the second enable signal to the second signal unit. At this time, the delay circuit can be set so that the second control signal outputs the second enable signal to the second signal unit through the second output terminal of the delay circuit with a delayed delay, or the second control signal outputs the second enable signal to the second signal unit immediately through the second output terminal of the delay circuit, so as to enable the control switch to be turned on, thereby realizing the conduction between the battery and the external charging device and the load.

[0053] Exemplary, reference Figure 1 and Figure 2 , the delay circuit can be composed of NMOS Q3, resistor R4, resistor R1, capacitor C2, resistor R6, NMOS Q6, and PMOS Q1, wherein NMOS Q3, Q1, and Q6 play a role in level conversion, resistors R4 and R6 limit current, and capacitor C1 stores energy. Resistor R4 and NMOS Q3 provide a charging circuit for capacitor C1, and the resistance value of resistor R4 needs to be set to be small, so that capacitor C1 charges quickly, so that the high-level signal as the second control signal is not delayed output. Resistor R1 provides a discharge circuit for capacitor C1, and the resistance value of resistor R1 is configured to be large, and the discharge speed of capacitor C1 is slow, so that the low-level signal as the first control signal can be delayed output. The parameters of resistor R1 and capacitor C1 can be configured to adjust the delay time, that is, the preset time length can be adjusted by configuring the parameters of resistor R1 and capacitor C1. The low-level signal input by the delay circuit as the first control signal can delay the output of the first enable signal, and the high-level signal input by the delay circuit as the second control signal can immediately output the second enable signal.

[0054] Exemplary, reference Figure 1 and Figure 2The skip delay circuit may include: a first switch (Q8). A first end of the first switch (Q8) is electrically connected to the first output end, and a second end of the first switch (Q8) is grounded. When the first switch (Q8) is turned on, the first output end is grounded, so that the first output end outputs a first control signal to the second signal unit; when the first switch (Q8) is turned off, the first output end is in a high impedance state, so that the first output end outputs a high impedance state to the second signal unit.

[0055] Exemplary, reference Figure 1 and Figure 2 , the skip delay circuit also includes a first switch branch and a second switch branch. The first switch branch is electrically connected to the first input terminal and the control terminal of the first switch (Q8), and the first switch branch is used to control the first switch (Q8) to be disconnected when the second control signal is input to the first input terminal, so that the first output terminal outputs a high impedance state. The second switch branch is electrically connected to the second input terminal and the control terminal of the first switch (Q8), and the second switch branch is used to control the first switch (Q8) to be disconnected when the discharge signal is input to the second input terminal, so that the first output terminal outputs a high impedance state. It can be seen that no matter which switch branch of the first switch branch and the second switch branch receives the second control signal or the discharge signal input to the corresponding input terminal, the first switch (Q8) can be disconnected to make the first output terminal output a high impedance state.

[0056] Exemplary, reference Figure 1 and Figure 2 The first switch branch and the second switch branch are also used to: when the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, control the first switch (Q8) to be turned on so that the first output terminal outputs the first enable signal. That is, the first switch branch and the second switch branch are also used to cooperate with each other, so that after the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, control the first switch (Q8) to be turned on so that the first output terminal outputs the first enable signal to the second signal unit.

[0057] When setting the first switch branch and the second switch branch, various methods may be used. Several setting methods are exemplarily introduced below.

[0058] Exemplary, reference Figure 1 and Figure 2, the first switch branch is also grounded. When the second control signal is input to the first input terminal, the control terminal of the first switch (Q8) is grounded through the first switch branch to disconnect the first switch (Q8). The second switch branch is also grounded; when the discharge signal is input to the second input terminal, the control terminal of the first switch (Q8) is grounded through the second switch branch to disconnect the first switch (Q8). In the above embodiment, each switch branch is grounded, and the control terminal of the first switch (Q8) is controlled to be grounded through the corresponding switch branch to trigger the disconnection of the control terminal of (Q8), so that the first output terminal outputs a high impedance state to the second signal unit.

[0059] The type of the first switch (Q8) can be of various types. For example, refer to Figure 2 , the first switch (Q8) can be an NMOS switch tube. It should be explained that the NMOS switch tube refers to an N-type metal oxide semiconductor, and its full English name is Negative Channel Metal Oxide Semiconductor. When the control end of the NMOS switch tube receives a high-level signal, the NMOS switch tube is turned on; when the control end of the NMOS switch tube receives a low-level signal, the NMOS switch tube is turned off. The switch tube corresponding to the NMOS switch tube is a PMOS switch tube, which refers to a P-type metal oxide semiconductor, and the full English name of the PMOS switch tube is Positiv Channel Metal Oxide Semiconductor. When the control end of the PMOS switch tube receives a high-level signal, the PMOS switch tube is turned off; when the control end of the PMOS switch tube receives a low-level signal, the PMOS switch tube is turned on. Of course, it should be noted that the first switch (Q8) is not limited to the use of NMOS switch tubes. In addition, other switch devices with high-level signal conduction and low-level signal cutoff can also be used. For example, the first switch (Q8) can also be a PNP transistor.

[0060] Exemplary, reference Figure 2, the second switch branch may include: a second switch (Q10), a first end of the second switch (Q10) is electrically connected to the control end of the first switch (Q8), and a second end of the second switch (Q10) is grounded; when a discharge signal is input to the second input end, the second switch (Q10) is turned on, so that the control end of the first switch (Q8) is grounded through the second switch (Q10). That is, a second switch (Q10) is added to the second switch branch, and the second switch (Q10) is connected between the ground and the control end of the first switch (Q8), and whether the second switch (Q10) is turned on is controlled by controlling whether the second switch (Q10) is turned on. Specifically, when a discharge signal is input to the second input end, the second switch (Q10) is turned on, so that the control end of the first switch (Q8) is grounded through the second switch (Q10). Exemplarily, when a charging signal is input to the second input end, the second switch (Q10) is turned off, so that the second switch branch does not input a level signal to the control end of the first switch (Q8).

[0061] Exemplary, reference Figure 2 , the first switch branch is also electrically connected to the reference voltage terminal. When the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, the second switch (Q10) is disconnected, the control terminal of the first switch (Q8) is electrically connected to the reference voltage terminal through the first switch branch, and the first switch (Q8) is turned on, so that the first output terminal outputs a first enable signal. That is, the reference voltage terminal is electrically connected through the first switch branch, and the reference voltage output by the reference voltage terminal can be a reference voltage such as but not limited to 3.3V. When the first control signal is input to the first input terminal, the control terminal of the first switch (Q8) is electrically connected to the reference voltage terminal through the first switch branch, thereby triggering the first switch (Q8) to turn on, so that the first output terminal outputs the first enable signal to the second signal unit, thereby realizing that if the battery receives the first control signal during the charging process, it will immediately output the first enable signal without passing through the delay circuit but by skipping the delay circuit, so that the control switch is immediately disconnected.

[0062] Exemplary, reference Figure 2 The second switch branch may further include: a third switch (Q11), a first end of the third switch (Q11) electrically connected to the control end of the second switch (Q10) and the reference voltage end, a second end of the third switch (Q11) grounded, and a control end of the third switch (Q11) electrically connected to the second input end. When a discharge signal is input to the second input end, the third switch (Q11) is disconnected, the reference voltage end and the control end of the second switch (Q10) are turned on, so that the second switch (Q10) is turned on, so that the control end of the first switch (Q8) is grounded through the second switch (Q10), so that the first output end outputs a high impedance state to the second signal unit.

[0063] Exemplary, reference Figure 2When a charging signal is input to the second input terminal, the third switch (Q11) is turned on, and the control terminal of the second switch (Q10) is grounded through the third switch (Q11), so that the second switch (Q10) is turned off. Thus, the control terminal of the first switch (Q8) is electrically connected to the reference voltage terminal through the first switch branch, so that the first switch (Q8) is turned on, so that the first output terminal can output the first enable signal.

[0064] The second switch (Q10) can be arranged in a variety of ways. Figure 2 , the second switch (Q10) can be an NMOS switch tube. When the control end of the NMOS switch tube receives a high-level signal, the NMOS switch tube is turned on; when the control end of the NMOS switch tube receives a low-level signal, the NMOS switch tube is turned off. Of course, it should be noted that the second switch (Q10) is not limited to using an NMOS switch tube. In addition, other switch devices with high-level signal conduction and low-level signal cutoff can also be used. For example, the second switch (Q10) can also be a PNP transistor.

[0065] The configuration of the third switch (Q11) is specifically related to the types of the charging signal and the discharging signal. Figure 2 , the third switch (Q11) can be an NMOS switch tube, in which case the charging signal is a high level signal and the discharging signal is a low level signal. Of course, in some embodiments, when the charging signal is a high level signal and the discharging signal is a low level signal, the third switch (Q11) can also be a PNP transistor. In addition, in some embodiments, the third switch (Q11) can also be a PMOS switch tube or an NPN transistor, in which case the charging signal is a low level signal and the discharging signal is a high level signal.

[0066] Exemplary, reference Figure 2 , the second switch branch may further include: a first resistor (R15), a second resistor (R16) and a third resistor (R17). The first end of the first resistor (R15) is electrically connected to the reference voltage end, the second end of the first resistor (R15) is electrically connected to the first end of the third switch (Q11), and the control end of the second switch (Q10), so that the first resistor (R15) realizes the current limiting function. The first end of the second resistor (R16) is electrically connected to the second input end, the second end of the second resistor (R16) is electrically connected to the first end of the third resistor (R17), and the control end of the third switch (Q11), and the second end of the third resistor (R17) is grounded, so that the second resistor (R16) and the third resistor (R17) cooperate to realize the voltage dividing function.

[0067] Exemplary, reference Figure 2The first switch branch may further include: a fourth switch (Q9), a first end of the fourth switch (Q9) being electrically connected to the reference voltage end and the control end of the first switch (Q8), a second end of the fourth switch (Q9) being grounded, and a control end of the fourth switch (Q9) being electrically connected to the first input end. That is, a fourth switch (Q9) is added to the first switch branch, the fourth switch (Q9) being connected between the ground, the reference voltage end and the control end of the first switch (Q8), and by controlling whether the fourth switch (Q9) is turned on, the control end of the first switch (Q8) is controlled to be turned on or off with the ground or the reference voltage end, thereby controlling the first switch (Q8) to be turned on or off. Specifically, when the first control signal is input to the first input end, the fourth switch (Q9) is turned off, and the reference voltage end is electrically connected to the control end of the first switch (Q8), so that the first switch (Q8) is turned on. When the second control signal is input to the first input end, the fourth switch (Q9) is turned on, and the control end of the first switch (Q8) is grounded through the fourth switch (Q9), so that the first switch (Q8) is turned off.

[0068] The type of the fourth switch (Q9) can be adopted in a variety of ways. Exemplarily, the type of the fourth switch (Q9) is related to the type of the first control signal. For example, referring to Figure 2 , the fourth switch (Q9) can be an NMOS switch tube, in which case the first control signal is a low level signal and the second control signal is a high level signal. Of course, in some embodiments, when the first control signal is a low level signal and the second control signal is a high level signal, the fourth switch (Q9) can also be a PNP transistor. In addition, in some embodiments, the fourth switch (Q9) can also be a PMOS switch tube or an NPN transistor, in which case the first control signal is a high level signal and the second control signal is a low level signal.

[0069] Exemplary, reference Figure 2 , the first switch branch may further include: a fourth resistor (R12), a fifth resistor (R13) and a sixth resistor (R14). Wherein, the first end of the fourth resistor (R12) is electrically connected to the reference voltage end, the second end of the fourth resistor (R12) is electrically connected to the first end of the fourth switch (Q9) and the control end of the first switch (Q8), so that the fourth resistor (R12) realizes a current limiting function. Exemplarily, the first end of the fifth resistor (R13) is electrically connected to the first input end, the second end of the fifth resistor (R13) is electrically connected to the first end of the sixth resistor (R14) and the control end of the fourth switch (Q9), and the second end of the sixth resistor (R14) is grounded, so that the fifth resistor (R13) and the sixth resistor (R14) realize a voltage dividing function.

[0070] Exemplary, reference Figure 2The skip delay circuit is composed of a fifth resistor (R13), a sixth resistor (R14), a fourth resistor (R12), a first resistor (R15), a second resistor (R16), a third resistor (R17), NMOS Q9 (fourth switch), NMOS Q10 (second switch), NMOS Q11 (third switch), and NMOS Q8 (first switch). Among them, R13 and R14, R16 and R17 play a voltage dividing role, R12 and R15 play a current limiting role, and Q9, Q10, Q11, and Q8 perform level conversion. When the CHARGE input as the third signal unit is used as a high-level signal of the charging signal, the skip delay circuit can work to output a low-level signal as the first enable signal, and the skip delay pulls down the second signal unit to output a low-level signal as the first enable signal.

[0071] Exemplary, reference Figure 3 A latch circuit and a latch release circuit may be added between the first signal unit and the delay circuit and the delay skipping circuit, and the latch release circuit is connected to an UNLOCK pin.

[0072] Exemplary, reference Figure 3 , the latch circuit is composed of resistor R7, resistor R9, NMOS Q5, resistor R3, diode D1, resistor R5, resistor R8, resistor R2, NMOS Q4, and PMOS Q2. Among them, resistors R7 and R9, R5 and R8 play a voltage-dividing role; resistors R2 and R3 play a current-limiting role. Q5 performs level conversion, diode D1 prevents the Q4 G-pole level from being pulled down by Q5, and Q2 and Q4 form a self-locking part. This part can latch the first control signal input by the second signal unit. Exemplarily, the first control signal can be a hard-line reset signal of the MCU to prevent the hard-line reset signal from being restored, and the control switch is not disconnected when the MCU is continuously stuck.

[0073] Exemplary, reference Figure 3 The unlocking latch circuit can be composed of a resistor R10, a resistor R11, and an NMOS Q7. R10 and R11 play a voltage dividing role, and Q7 performs level conversion. The unlocking latch circuit can unlock the low-level signal output by the latch circuit as the first control signal, or the high-level signal as the second control signal. The UNLOCK pin is used to input a high-level signal or is in a high-impedance state. When a high level is input to the UNLOCK pin, the low-level signal output by the latch circuit as the first control signal, or the high-level signal as the second control signal can be unlocked.

[0074] Exemplary, reference Figure 3, the PORST pin can be the first signal unit, which is the hard-line reset signal of the MCU and is reset and output by the SBC. During normal operation, a high-level signal is input as the second control signal, and during reset, a low-level signal is input as the first control signal. The unlock signal of the UNLOCK pin is output by the MCU. During normal operation, a high-level signal is input to the UNLOCK pin, and the UNLOCK pin is in a high-impedance state during reset. The CHARGE pin is used as the third signal unit to input charging and discharging signals. The charging signal is a high-level signal. When the vehicle is in the charging process, the third signal unit inputs a high-level signal; when the battery is not charged, the third signal unit inputs a low-level signal. The EN pin is the second signal unit, which is connected to the enable pin of the driver chip. When the second signal unit outputs the second enable signal, the driver chip is enabled and the enable control switch is turned on; when the second signal unit outputs the second enable signal, the driver chip enable is invalid and the enable control switch is turned off.

[0075] The specific implementation process of the solution is as follows:

[0076] refer to Figure 3 , during normal operation, the PORST pin inputs a high-level signal (the second control signal), the UNLOCK pin inputs a high-level signal, Q7 is turned on, and the unlocking circuit outputs a low level. The unlocking circuit outputs a low level, causing Q4 to be disconnected, Q2 to be disconnected, and the latch circuit outputs a high level. The latch circuit outputs a high level, causing Q9 to be turned on, Q8 to remain disconnected, and the delay circuit is skipped to output a high-impedance state. The latch circuit outputs a high level, causing Q3 to be turned on, Q1 to be turned on, Q6 to be disconnected, and the delay circuit outputs a high-level signal (the second enable signal). The delay circuit outputs a high level, and at the same time skips the delay circuit to output a high-impedance state. The EN pin, which is the second signal unit, outputs a high level (the second enable signal), enabling the driver chip to control the control switch to be turned on, and the battery can work normally.

[0077] refer to Figure 3During the discharge process, when the main control MCU of the BMS is abnormally reset, during the discharge process, the CHARGE pin as the third signal unit inputs a low-level signal (discharge signal), Q11 is disconnected, Q10 is turned on, and Q8 is disconnected, skipping the delay circuit and always outputting a high-impedance state. When the main control MCU is abnormally reset, the PORST pin as the first signal unit inputs a low-level signal (first control signal), and the UNLOCK pin is in a high-impedance state. The UNLOCK pin is in a high-impedance state, causing Q7 to be disconnected, and releasing the latch circuit outputting a high-impedance state. As the first signal unit, PORST inputs a low-level signal (first control signal), causing Q5 to be disconnected, and at the same time releasing the high-impedance state output by the latch circuit, causing Q4 to be turned on, Q2 to be turned on, Q2 and Q4 to form a self-locking state, and the latch circuit outputs a low-level signal. The latch circuit outputs a low-level signal, causing Q3 to be disconnected, C1 to discharge through resistor R1, Q6 to be turned on with a delay, and Q1 to be disconnected with a delay. The delay circuit delays the output of a low-level signal as the first enable signal, and skips the high-impedance state of the delay circuit output. The EN pin of the second signal unit delays the output of a low-level signal, and the control switch can be disconnected with a delay.

[0078] refer to Figure 3 During the charging process, when the main control MCU is abnormally reset, during the charging process, CHARGE as the third signal unit inputs a high-level signal (charging signal), Q11 is turned on, causing Q10 to be disconnected. When the main control MCU is abnormally reset, the first signal unit as the PORST pin inputs the first control signal (low-level signal), and the UNLOCK pin is in a high-impedance state. The UNLOCK pin is in a high-impedance state, causing Q7 to be disconnected, and the latch circuit outputs a high-impedance state. The first signal unit as the PORST pin inputs the first control signal (low-level signal), causing Q5 to be disconnected, and at the same time, the latch circuit outputs a high-impedance state, causing Q4 to be turned on, Q2 to be turned on, Q2 and Q4 to form a self-lock, and the latch circuit outputs a low-level signal. The latch circuit outputs a low-level signal, causing Q9 to be disconnected, and at the same time, Q10 is disconnected, Q8 is turned on, and the delay circuit is skipped to output a low-level signal as the first enable signal, skipping the delay circuit, and the EN pin as the second signal unit immediately outputs a low level as the first enable signal, and the control switch is immediately disconnected.

[0079] In the various embodiments shown above, compared with the related art, by setting the third signal unit and skipping the delay circuit, it is possible to distinguish different working conditions of charging and discharging, so that different processing methods can be used in different working conditions; and when the first signal unit determines the first control signal and the third signal unit determines the charging signal, the skip delay circuit controls the second signal unit to output the first enable signal, so that the control switch is immediately disconnected to prevent the battery from overcharging and ensure the safety of the battery. That is, in this application, when the first control signal for controlling the control switch to disconnect is received under the charging condition, the processing method is to immediately power off to prevent the battery from overcharging and ensure the safety of the battery.

[0080] In some of the above embodiments, compared with the related art, by controlling the enable signal of the third signal unit connected to the driver chip, during the battery discharge process, if the main control MCU of the BMS is abnormally reset, the high-voltage contactor serving as the control switch will be disconnected with a delay, so that the vehicle will not suddenly lose power and control during operation, ensuring driving safety; during the power battery charging process, if the MCU is abnormally reset, the high-voltage contactor will be disconnected immediately to prevent the battery from overcharging and ensure battery safety.

[0081] Exemplarily, compared with the related art, during the driving of the electric vehicle, if the BMS main control MCU is abnormally reset, the high-voltage contactor as the control switch will be disconnected with a delay, and the vehicle power system will not be suddenly interrupted, thereby ensuring driving safety and preventing the system from being abnormally reset for a long time, causing the vehicle to be out of control. During the charging process of the power battery, if the BMS main control MCU is abnormally reset, the high-voltage contactor will immediately disconnect and stop charging, ensuring the safety of the battery. In addition, when the MCU is abnormally reset, the MCU reset signal is used to disconnect the contactor as the control switch, which is associated with the MCU reset to avoid the contactor from disconnecting by mistake. In some embodiments, the MCU reset signal can also be self-locked, and the MCU needs to send an unlock signal to cancel the contactor disconnection, which can prevent the contactor from disconnecting after the MCU reset fails.

[0082] Furthermore, the present application embodiment also provides a battery management system, referring to Figure 1 to Figure 3 The battery management system includes any one of the above control circuits for controlling a control switch of a battery. Exemplarily, the battery management system may be a BMS in a battery pack, which is used to control the batteries in the battery pack.

[0083] In addition, the present application also provides a distribution box, referring to Figure 1 to Figure 3 , the distribution box includes any of the above-mentioned battery management systems. Exemplarily, the distribution box can be a distribution box in a battery pack. The distribution box is provided with a battery management system and other devices to control the batteries in the battery pack and realize other power distribution functions.

[0084] In addition, the present application also provides a battery pack, referring to Figure 1 to Figure 3 The battery pack includes: a battery, a control switch, a driving chip and any one of the above-mentioned distribution boxes; wherein the control switch is used to control the battery. Exemplarily, the battery is electrically connected to an external load and a charging device through the control switch; the driving chip is electrically connected to the control switch and the second signal unit; the driving chip is used to control the control switch to be disconnected according to the first enable signal output by the second signal unit.

[0085] Exemplarily, the control switch may be any type of switch device such as, but not limited to, a contactor, a relay, etc. Exemplarily, the control switch is connected to the charging circuit and the discharging circuit of the battery. Only after the control switch is closed can the battery be connected to an external charging device and a load to charge the battery or discharge the battery to the outside.

[0086] Exemplarily, the driver chip can be any type of chip, which is used to enable the control switch to be turned on or off according to the enable signal it receives. Exemplarily, after receiving the first enable signal, the driver chip enables the control switch to be turned off so that the battery is connected to the external charging device and the load; after receiving the second enable signal, the driver chip enables the control switch to be turned on so that the battery is disconnected from the external charging device and the load.

[0087] Furthermore, the present application also provides an electric energy device, referring to Figure 1 to Figure 3 , the electric energy device includes: any one of the above-mentioned control circuits for controlling the control switch of the battery, any one of the above-mentioned battery management systems, any one of the above-mentioned distribution boxes, or any one of the above-mentioned battery packs. Exemplarily, the electric energy device can be a device with electric energy such as but not limited to vehicles, aircraft, ships, household appliances or energy storage cabinets. When the electric energy device is a vehicle, exemplarily, the vehicle can be any vehicle including a battery such as but not limited to an electric vehicle, a hybrid vehicle, etc. Exemplarily, the above-mentioned battery can be a power battery of the vehicle, and can also be a storage battery of the vehicle.

[0088] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A control circuit for controlling a control switch of a battery, characterized in that: include: A first signal unit, used to determine a first control signal; The first control signal is used to control the control switch to be disconnected; A second signal unit, configured to output a first enable signal; The first enable signal is used to enable the control switch to be disconnected; A third signal unit, used to determine a discharge signal and a charge signal; A delay circuit electrically connecting the first signal unit and the second signal unit; A skip delay circuit electrically connected to the first signal unit, the second signal unit and the third signal unit; When the first signal unit determines the first control signal and the third signal unit determines the discharge signal, the delay circuit controls the second signal unit to output the first enable signal after a preset time period; When the first signal unit determines the first control signal and the third signal unit determines the charging signal, the skip delay circuit controls the second signal unit to output the first enable signal.

2. The control circuit according to claim 1, characterized in that: The first signal unit is further used to determine a second control signal, the second control signal is used to control the control switch to be turned on; the second signal unit is further used to output a second enable signal, the second enable signal is used to enable the control switch to be turned on; When the first signal unit determines the second control signal, the delay circuit controls the second signal unit to output the second enable signal.

3. The control circuit according to claim 2, characterized in that: The skip delay circuit comprises: A first input terminal, electrically connected to the first signal unit; A second input terminal, electrically connected to the third signal unit; A first output terminal, electrically connected to the second signal unit; Wherein, when the first signal unit inputs the first control signal through the first input terminal, and the third signal unit inputs the charging signal through the second input terminal, the first output terminal outputs the first enable signal to the second signal unit; When the first signal unit inputs the second control signal through the first input terminal, and / or the third signal unit inputs the discharge signal through the second input terminal, the first output terminal outputs a high impedance state to the second signal unit.

4. The control circuit according to claim 3, characterized in that: The delay circuit comprises: A third input terminal, electrically connected to the first signal unit; A second output terminal, electrically connected to the second signal unit; Wherein, when the first signal unit inputs the first control signal through the third input terminal, and the third signal unit inputs the discharge signal through the second input terminal, the second output terminal outputs the first enable signal to the second signal unit after the preset time length; When the first signal unit inputs the second control signal through the third input terminal, the second output terminal outputs the second enable signal to the second signal unit.

5. The control circuit according to claim 3 or 4, characterized in that: The skip delay circuit comprises: A first switch, wherein a first end of the first switch is electrically connected to the first output end, and a second end of the first switch is grounded; a first switch branch, electrically connected to the first input terminal and a control terminal of the first switch, and configured to control the first switch to be disconnected when the second control signal is input to the first input terminal, so that the first output terminal outputs the high impedance state; a second switch branch, electrically connected to the second input terminal and the control terminal of the first switch, and configured to control the first switch to be disconnected when the discharge signal is input to the second input terminal, so that the first output terminal outputs the high impedance state; The first switch branch and the second switch branch are further used to: when the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, control the first switch to be turned on so that the first output terminal outputs the first enable signal.

6. The control circuit according to claim 5, characterized in that: The first switch branch is also grounded; when the second control signal is input to the first input end, the control end of the first switch is grounded through the first switch branch, so that the first switch is disconnected; The second switch branch is also grounded; when the discharge signal is input to the second input terminal, the control terminal of the first switch is grounded through the second switch branch to disconnect the first switch.

7. The control circuit according to claim 6, characterized in that: The first switch is an NMOS switch tube or a PNP transistor.

8. The control circuit according to claim 6, characterized in that: The second switch branch comprises: a second switch, a first end of the second switch is electrically connected to a control end of the first switch, and a second end of the second switch is grounded; When the discharge signal is input to the second input terminal, the second switch is turned on, so that the control terminal of the first switch is grounded through the second switch.

9. The control circuit according to claim 8, characterized in that: The first switch branch is also electrically connected to a reference voltage terminal; When the first control signal is input to the first input terminal and the charging signal is input to the second input terminal, the second switch is disconnected, the control terminal of the first switch is electrically connected to the reference voltage terminal through the first switch branch, and the first switch is turned on so that the first output terminal outputs the first enable signal.

10. The control circuit according to claim 9, characterized in that: The second switch branch further includes: a third switch, a first end of the third switch electrically connected to the control end of the second switch and the reference voltage end, a second end of the third switch is grounded, and a control end of the third switch is electrically connected to the second input end; When the discharge signal is input to the second input terminal, the third switch is turned off, and the reference voltage terminal is connected to the control terminal of the second switch, so that the second switch is turned on; When the charging signal is input to the second input terminal, the third switch is turned on, and the control terminal of the second switch is grounded through the third switch, so that the second switch is turned off.

11. The control circuit according to claim 10, characterized in that: The second switch is an NMOS switch tube or a PNP transistor.

12. The control circuit according to claim 10, characterized in that: The third switch is an NMOS switch tube or a PNP transistor, the charging signal is a high level signal, and the discharging signal is a low level signal.

13. The control circuit according to claim 10, characterized in that: The second switch branch further includes: a first resistor, wherein a first end of the first resistor is electrically connected to the reference voltage end, and a second end of the first resistor is electrically connected to a first end of the third switch and a control end of the second switch; A second resistor and a third resistor, wherein a first end of the second resistor is electrically connected to the second input end, a second end of the second resistor is electrically connected to a first end of the third resistor and a control end of the third switch, and a second end of the third resistor is grounded.

14. The control circuit according to any one of claims 9 to 13, characterized in that: The first switch branch comprises: a fourth switch, wherein a first end of the fourth switch is electrically connected to the reference voltage end and the control end of the first switch, a second end of the fourth switch is grounded, and the control end of the fourth switch is electrically connected to the first input end; When the first control signal is input to the first input terminal, the fourth switch is turned off, and the reference voltage terminal is electrically connected to the control terminal of the first switch to turn on the first switch; When the second control signal is input to the first input terminal, the fourth switch is turned on, and the control terminal of the first switch is grounded through the fourth switch, so that the first switch is turned off.

15. The control circuit according to claim 14, characterized in that: The fourth switch is an NMOS switch tube or a PNP transistor, the first control signal is a low level signal, and the second control signal is a high level signal.

16. The control circuit according to claim 14, characterized in that: The first switch branch further includes: a fourth resistor, wherein a first end of the fourth resistor is electrically connected to the reference voltage end, and a second end of the fourth resistor is electrically connected to a first end of the fourth switch and a control end of the first switch; a fifth resistor and a sixth resistor, wherein a first end of the fifth resistor is electrically connected to the first input end, a second end of the fifth resistor is electrically connected to a first end of the sixth resistor and a control end of the fourth switch, and a second end of the sixth resistor is grounded.

17. The control circuit according to claim 1, characterized in that: At least one of the first signal unit, the second signal unit and the third signal unit is a pin.

18. A battery management system, characterized in that: include: A control circuit for controlling a control switch of a battery according to any one of claims 1 to 17.

19. A distribution box, characterized in that: include: A battery management system as claimed in claim 18.

20. A battery pack, characterized in that: include: Battery; A control switch, used for controlling the battery; The distribution box as claimed in claim 19; A driving chip is electrically connected to the control switch and the second signal unit, and is used to control the control switch to be disconnected according to the first enable signal output by the second signal unit.

21. An electric energy device, characterized in that: include: A control circuit for controlling a control switch of a battery as claimed in any one of claims 1 to 17, a battery management system as claimed in claim 18, a distribution box as claimed in claim 19, or a battery pack as claimed in claim 20.

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