CN219779802U

CN219779802U - Charging activation circuit and battery system

Info

Publication number: CN219779802U
Application number: CN202320389165.7U
Authority: CN
Inventors: 谢立标; 晋文章; 晋玉意
Original assignee: Guangdong Pow Tech New Power Co ltd
Current assignee: Guangdong Pow Tech New Power Co ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-09-29
Anticipated expiration: 2033-03-03

Abstract

The utility model provides a charging activation circuit and a battery system, wherein the charging activation circuit comprises: the first voltage dividing element is used as a high-level input end, and the second end of the first voltage dividing element is used for being connected with a charging detection end of the battery management device; the first end of the first switching tube is connected with the second end of the first voltage dividing element, and the second end of the first switching tube is used for being grounded; the first end of the upper and lower pulling module is used for being connected with the positive charging end of the battery system with the different charging and discharging ports, and the second end of the upper and lower pulling module is used for being connected with the negative charging end of the battery system; the first controlled end of the switch driving module is connected with the first end of the upper pull-down module, the second controlled end of the switch driving module is connected with the second end of the upper pull-down module, and the output end of the switch driving module is connected with the controlled end of the first switch tube. By adopting the scheme of the utility model, the cost can be reduced.

Description

Charging activation circuit and battery system

Technical Field

The present utility model relates to the field of battery management technologies, and in particular, to a charging activation circuit and a battery system.

Background

With the continuous maturity of lithium battery technology, lithium batteries have become a power source for most devices. In order to prolong the service life of the lithium battery and develop other battery functions centering on the lithium battery, the lithium battery and a battery management device (Battery Management System, abbreviated as BMS) generally form a battery system together, so that the battery management device can manage the charge and discharge processes of the battery and control the functions of other battery auxiliary circuits in the battery system.

Since the battery management device also needs to take electricity from the lithium battery, adding the battery management device to the battery system increases the overall power consumption of the battery system. In order to reduce standby power consumption of the battery system in standby so that the battery system can be operated for a longer time, the power management device may switch from an operating mode to a sleep mode when the lithium battery is in a non-use state, so as to reduce overall standby power consumption of the battery system. When the battery system starts to charge, the power management device can be switched from the sleep mode to the working mode, so that the lithium battery can be intelligently managed and maintained.

In order to wake up the power management device in time during charging, a charging activation circuit may be provided in the battery system. The charging activation circuit is used for judging whether the battery system is connected to the charger or not and waking up the power management device when the battery system is connected to the charger. However, the existing charging activation circuit has a complex structure, needs to be matched with an isolation circuit for use, and has the problem of high cost.

Disclosure of Invention

The object of the present utility model is to solve at least one of the above-mentioned technical drawbacks, in particular the technical drawbacks of the prior art which are too costly.

In a first aspect, an embodiment of the present utility model provides a charging activation circuit, including:

the first voltage dividing element is used for being used as a high-level input end, and the second end of the first voltage dividing element is used for being connected with a charging detection end of the battery management device;

the first end of the first switching tube is connected with the second end of the first voltage dividing element, and the second end of the first switching tube is used for being grounded;

the battery system comprises a pull-up and pull-down module, wherein a first end of the pull-up and pull-down module is used for being connected with a positive charging end of a battery system with a different charge and discharge port, and a second end of the pull-up and pull-down module is used for being connected with a negative charging end of the battery system;

the first controlled end of the switch driving module is connected with the first end of the pull-up and pull-down module, the second controlled end of the switch driving module is connected with the second end of the pull-up and pull-down module, and the output end of the switch driving module is connected with the controlled end of the first switch tube;

under the condition that the absolute value of the voltage difference between the first controlled end of the switch driving module and the second controlled end of the switch driving module is larger than or equal to a preset threshold value, the output end of the switch driving module outputs a conducting voltage to the first switching tube so as to conduct the first switching tube; and under the condition that the absolute value of the voltage difference is smaller than the preset threshold value, the output end of the switch driving module outputs an off voltage to the first switching tube so as to disconnect the first switching tube.

In one embodiment, the switch driving module includes:

the first end of the second voltage division element is connected with the first end of the pull-up and pull-down module;

the first end of the second switching tube is connected with the second end of the second voltage dividing element, and the controlled end of the second switching tube is connected with the second end of the pull-up and pull-down module;

the first end of the voltage division unit is connected with the second end of the second switching tube, the second end of the voltage division unit is connected with the controlled end of the first switching tube, and the third end of the voltage division unit is connected with the second end of the first switching tube.

In one embodiment, the voltage dividing unit includes:

the first end of the third voltage dividing element is connected with the second end of the second switch tube;

the first end of the fourth voltage dividing element is connected with the second end of the third voltage dividing element, and the second end of the fourth voltage dividing element is connected with the controlled end of the first switching tube;

the first end of the fifth voltage dividing element is connected with the second end of the fourth voltage dividing element, and the second end of the fifth voltage dividing element is connected with the second end of the first switching tube;

the first end of the first capacitor is connected with the first end of the fourth voltage dividing element, and the second end of the first capacitor is connected with the second end of the fifth voltage dividing element.

In one embodiment, the switch driving module further includes:

the first diode is connected between the first end of the second switch tube and the second end of the second voltage division element, the positive electrode of the first diode is connected with the second end of the second voltage division element, and the negative electrode of the first diode is connected with the first end of the second switch tube.

In one embodiment, the charge activation circuit further comprises:

the sixth voltage dividing element is connected between the second end of the pull-up and pull-down module and the negative electrode charging end;

and the first end of the second capacitor is connected with the first end of the sixth voltage dividing element, and the second end of the second capacitor is connected with the second end of the sixth voltage dividing element.

In one embodiment, the charge activation circuit further comprises:

the second diode is connected between the sixth voltage dividing element and the negative electrode charging end, the negative electrode of the second diode is used for being connected with the negative electrode charging end, and the positive electrode of the second diode is connected with the sixth voltage dividing element.

In one embodiment, the first switching transistor is a triode.

In a second aspect, an embodiment of the present utility model provides a battery system including:

the positive electrode input and output end of the battery pack is used as a positive electrode charging end of the battery system, and the negative electrode input and output end of the battery pack is used for grounding;

the first end of the charge-discharge control device is connected with the negative electrode input-output end of the battery pack, the second end of the charge-discharge control device is used as the negative electrode charging end of the battery system, and the third end of the charge-discharge control device is used as the negative electrode discharging end of the battery system;

the first control end and the second control end of the battery management device are connected with the controlled end of the charge-discharge control device;

the charge activation circuit of any one of the above embodiments, wherein the charge activation circuit is connected to a charge detection terminal of the battery management device, a positive charge terminal of the battery system, and a negative charge terminal of the battery system, respectively.

In one embodiment, the battery system further comprises:

the input end of the voltage conversion device is connected with the positive input and output end of the battery pack, and the output end of the voltage conversion device is connected with the power supply end of the battery management device.

In one embodiment, the charge and discharge control device includes:

the first end of the third switching tube is connected with the negative electrode input and output end of the battery pack, the second end of the third switching tube is used as the negative electrode discharge end, and the controlled end of the third switching tube is connected with the first control end of the battery management device;

the first end of the fourth switching tube is connected with the second end of the third switching tube, the second end of the fourth switching tube is used as the negative electrode charging end, and the controlled end of the fourth switching tube is connected with the second control end of the battery management device.

In the charge activating circuit and the battery system, because the charging and discharging of the battery system are different, when the charger is not connected to the circuit, the pins of the positive charging end or the negative charging end are suspended. Under the action of the pull-down module, the absolute value of the voltage difference between the first controlled end and the second controlled end of the switch driving module is smaller than a preset threshold value, so that the switch driving module controls the first switch tube to be disconnected. In this case, the charge activation circuit outputs a high level to the charge detection terminal of the battery management device to put the battery management device in a sleep state.

Under the condition that the charger is connected to the circuit, the voltages of the positive charging end and the negative charging end are determined and are not equal, so that the absolute value of the voltage difference between the first controlled end and the second controlled end of the switch driving module can meet a preset threshold value, and the switch driving module drives the first switching tube to be conducted. When the first switch tube is conducted, the charging activation circuit outputs a low level to a charging detection end of the battery management device so as to wake up the battery management device.

The utility model can realize the charge activation circuit applied to the battery system with different charge and discharge ports through the first voltage dividing element, the first switch tube, the up-down pulling module and the switch driving module, has simple circuit structure, does not need to be matched with an isolation circuit, and has the advantage of low cost.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a charge activation circuit according to one embodiment;

FIG. 2 is a second schematic diagram of a charge activation circuit according to one embodiment;

FIG. 3 is a third schematic diagram of a charge activation circuit according to one embodiment;

FIG. 4 is a fourth schematic diagram of a charge activation circuit in one embodiment;

fig. 5 is a schematic view of the structure of a battery system in one embodiment.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In one embodiment, the present utility model provides a charging activation circuit 10 that may be applied to a battery system with different charging and discharging ports, for waking up a battery management device in the battery system when detecting that the battery system is connected to a charger, so that the battery management device may be switched from a sleep state to an operating state, and perform battery management. The different charge and discharge ports are different from the charge interface and the discharge interface of the battery system, and the battery system realizes charge and discharge through at least two interfaces. Further, the charging interface and the discharging interface may multiplex the positive terminals and have different negative terminals. That is, the positive charging terminal c+ and the positive discharging terminal p+ may be the same terminal, and the negative charging terminal C-and the negative discharging terminal P-may be different terminals.

When the battery management device is in the dormant state, the battery management device cuts off the connection between the battery pack and the positive charging terminal c+ or cuts off the connection between the battery pack and the negative charging terminal C-in the battery system. Therefore, when the battery management device is in a dormant state and the battery system is not connected with the charger, one of the positive charging end C+ and the negative charging end C-of the battery system is in a floating state, and the other is connected with the input and output ends of the battery pack, so that the voltage is fixed.

For ease of description, embodiments herein are described with the negative charge terminal C-floating and the positive charge terminal c+ voltage fixed as an example. It can be understood that, except for the case described herein, when the charger is not connected, the battery system may also be that the negative charging terminal C-voltage is fixed, the positive charging terminal c+ is suspended, and specific working principles of the circuit may be referred to each other, which is not described herein again.

In one embodiment, the present utility model provides a charge activation circuit 10. As shown in fig. 1, the charge activation circuit 10 herein may include a first voltage dividing element R1, a first switching transistor Q1, a pull-up and pull-down module 120, and a switch driving module 130. Wherein. The first voltage dividing element R1 is an electronic component having a voltage dividing function, and may be, but not limited to, a resistor, and is described herein by taking a resistor as an example. The first switching transistor Q1 is an electronic component capable of being selectively turned on or off, and may be, but not limited to, a transistor or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and is described herein as an example of a transistor. The pull-up and pull-down module 120 refers to an electronic component that pulls up or down a voltage, and may be, but not limited to, a single resistor or a resistor unit composed of a plurality of resistors. In one example, to simplify circuit implementation, the pull-up and pull-down module 120 may be a single resistor. The switch driving module 130 refers to a circuit for controlling the switching state of the first switching transistor Q1.

Specifically, the first end of the first voltage dividing element R1 is used as a high-level input end, and the second end of the first switching tube Q1 is used for grounding. That is, when the charge activating circuit 10 is put into use, the first terminal voltage of the first voltage dividing element R1 may be a high level, and the second terminal voltage of the first switching transistor Q1 may be a low level. Since the charge detection terminal CHG CHK of the battery management device is active low, the battery management device enters or is in an operating state when the charge detection terminal CHG CHK receives a low level, and enters or is in a sleep state when the charge detection terminal CHG CHK receives a high level. It will be appreciated that the particular voltage value of the high level may be set depending on the device configuration of the battery management apparatus, which is not particularly limited herein. For convenience of description, the embodiment herein will be described by taking the high level equal to 3V and the low level as the reference ground level, in which case the first terminal of the first voltage dividing element R1 may be used to connect to the 3V power source, and the second terminal of the first switching tube Q1 may be used to ground.

The second end of the first voltage dividing element R1 is connected to the charge detection end CHG CHK of the battery management device, and is connected to the first end of the first switching tube Q1. The controlled end of the first switch tube Q1 is connected to the output end of the switch driving module 130, the first controlled end of the switch driving module 130 is connected to the first end of the pull-up and pull-down module 120, and the second controlled end of the switch driving module 130 is connected to the second end of the pull-up and pull-down module 120. The pull-up and pull-down module 120 has a first end for connecting to the positive charging terminal c+ of the battery system and a second end for connecting to the negative charging terminal C-of the battery system.

When the battery system is not connected with a charger, the negative electrode charging end C-is suspended, and the voltage of the positive electrode charging end C+ is fixed to be V+. Accordingly, the voltage of the second controlled terminal of the switch driving module 130 is pulled up to v+ by the pull-up and pull-down module 120. Since the first controlled terminal of the switch driving module 130 is connected to the positive charging terminal c+, the voltage of the first controlled terminal of the switch driving module 130 is also v+. As can be seen, when the battery system is not connected to the charger, the absolute value of the voltage difference between the first controlled terminal and the second controlled terminal of the switch driving module 130 is close to 0, and the absolute value of the voltage difference is smaller than the preset threshold, so that the output terminal of the switch driving module 130 outputs the off voltage to the controlled terminal of the first switching tube Q1 to disconnect the first terminal of the first switching tube Q1 from the second terminal of the first switching tube Q1. When the first switching tube Q1 is turned off, the charge activation circuit 10 outputs a high level to the charge detection terminal CHG CHK of the battery management device via the first voltage dividing element R1, so that the battery management device enters or continues to remain in a sleep state.

When the battery system is connected to the charger, the negative charging terminal C-voltage is fixed to V-, and the positive charging terminal c+ voltage is fixed to v+. The voltage at the first controlled end of the switch driving module 130 is v+, and the voltage at the second controlled end is V-, so that it can be seen that the absolute value of the voltage difference between the two controlled ends of the switch driving module 130 is greater than or equal to the preset threshold, and therefore, the switch driving module 130 can output the conducting voltage to the controlled end of the first switching tube Q1 through the output end thereof to conduct the connection between the first end of the first switching tube Q1 and the second end of the first switching tube Q1. When the first switching tube Q1 is turned on, the 3V power supply, the first voltage dividing element R1, the first switching tube Q1 and the formation loop, the second end voltage of the first voltage dividing element R1 is low level, so that the battery management device can be awakened or kept in a working state, and further battery management is achieved.

The charging activation circuit 10 which can be applied to a battery system with different charging and discharging ports can be realized through the first voltage dividing element R1, the first switching tube Q1, the up-down pulling module 120 and the switch driving module 130, the circuit structure is simple, an isolation circuit is not needed, and the charging activation circuit has the advantage of low cost.

In one embodiment, as shown in fig. 2, the switch driving module 130 may include a second voltage dividing element R2, a second switching tube Q2, and a voltage dividing unit 131. The device description of the second voltage dividing element R2 may refer to the device description of the first voltage dividing element R1, and the device description of the second switching tube Q2 may refer to the device description of the first switching tube Q1, which is not described herein. For ease of illustration, the second switching transistor Q2 is described herein as a transistor. The voltage dividing unit 131 refers to a circuit having a voltage dividing function, and may be, but not limited to, a single resistor or a resistor unit composed of a plurality of resistors.

The first end of the second voltage division element R2 is connected with the first end of the pull-up and pull-down module 120, the second end of the second voltage division element R2 is connected with the first end of the second switching tube Q2, the second end of the second switching tube Q2 is connected with the first end of the voltage division unit 131, the second end of the voltage division unit 131 is connected with the controlled end of the first switching tube Q1, and the third end of the voltage division unit 131 is connected with the second end of the first switching tube Q1. The controlled end of the second switching tube Q2 is connected to the second end of the pull-up and pull-down module 120. When the second switching tube Q2 is a triode, the controlled end of the second switching tube Q2 is a base electrode of the triode, the first end of the second switching tube Q2 is an emitter electrode of the triode, and the second end of the second switching tube Q2 is a collector electrode of the triode.

When the battery system is not connected to the charger, the emitter and base voltages of the second switching tube Q2 are equal, and the second switching tube Q2 is in an off state, so the voltage dividing unit 131 cannot provide the on voltage for the first switching tube Q1, and the first switching tube Q1 is turned off. When the battery system is connected to the charger, the voltage difference between the emitter and the base of the second switching tube Q2 is greater than or equal to the conduction voltage of the triode, and the second switching tube Q2 is conducted. When the second switching tube Q2 is turned on, the positive charging terminal c+, the second voltage dividing element R2, the second switching tube Q2, the voltage dividing unit 131 and the ground form a loop, so that the voltage drop of the voltage dividing unit 131 is not zero, and the voltage dividing unit 131 can provide a turn-on voltage to the controlled terminal of the first switching tube Q1 to turn on the first switching tube Q1.

In this embodiment, the switch driving module 130 can be implemented through the second voltage dividing element R2, the second switching tube Q2 and the voltage dividing unit 131, so that the circuit structure can be further simplified and the circuit cost can be reduced.

In one embodiment, as shown in fig. 3, the voltage division unit 131 may include a third voltage division element R3, a fourth voltage division element R4, a fifth voltage division element R5, and a first capacitor C1. The device description of each voltage dividing element may refer to the device description of the first voltage dividing element R1, which is not described herein again.

The first end of the third voltage dividing element R3 is connected to the second end of the second switching tube Q2, the second end of the third voltage dividing element R3 is connected to the first end of the fourth voltage dividing element R4, the second end of the fourth voltage dividing element R4 is connected to the controlled end of the first switching tube Q1 and the first end of the fifth voltage dividing element R5, and the second end of the fifth voltage dividing element R5 is connectable to the second end of the first switching tube Q1, that is, used for grounding. The first capacitor C1 is connected in parallel with the fourth voltage dividing element R4 and the fifth voltage dividing element R5, that is, a first end of the first capacitor C1 is connected to the first end of the fourth voltage dividing element R4, and a second end of the first capacitor C1 is used for grounding.

When the battery system is not connected to the charger, the second switching tube Q2 is turned off, so that the third voltage dividing element R3 is suspended. The controlled terminal voltage of the first switching tube Q1 is pulled down to the ground through the fifth voltage dividing element R5, and the first switching tube Q1 is turned off. When the battery system is connected to the charger, the second switching tube Q2 is turned on, the voltage drop of the fifth voltage dividing element R5 is not zero, and the first switching tube Q1 is turned on. The first capacitor C1 is used as a bypass capacitor, can absorb voltage spikes generated when the charger is connected, avoids device damage, and ensures the safety and reliability of the circuit.

Further, as shown in fig. 3, the switch driving module 130 may further include a first diode D1 connected between the first terminal of the second switching tube Q2 and the second terminal of the second voltage dividing element R2. The positive pole of the first diode D1 is connected with the second end of the second voltage division element R2, and the negative pole of the first diode D1 is connected with the first end of the second switching tube Q2. Therefore, the damage of components caused by reverse connection of the charger can be avoided, and the safety and reliability of the circuit are further improved.

In one embodiment, as shown in fig. 4, the charging activation circuit 10 of the present utility model further includes a sixth voltage dividing element R6 and a second capacitor C2. The description of the devices of the sixth voltage dividing element R6 can refer to the description of the devices of the first voltage dividing element R1, and will not be repeated herein.

The sixth voltage dividing element R6 is connected in parallel with the second capacitor C2, and the parallel-connected sixth voltage dividing element R6 and second capacitor C2 may be connected between the second end of the pull-up/down module 120 and the negative charging end C-of the battery system. When the battery system is connected to the charger, the positive charging end c+, the up-down pulling module 120, the parallel sixth voltage dividing element R6, the second capacitor C2 and the negative charging end C-can form a loop, and the voltage drop of the up-down pulling module 120 is smaller than the voltage difference between the positive charging end c+ and the negative charging end C-, so that the second switching tube Q2 can be turned on, the safety of the device of the second switching tube Q2 can be ensured, and the damage of the device can be avoided. Meanwhile, the second capacitor C2 is used as a bypass capacitor, and can absorb voltage spikes generated when the charger is connected, so that the damage of devices is avoided, and the safety and reliability of the circuit are further ensured.

Further, as shown in fig. 4, the charge activation circuit 10 of the present utility model further includes a second diode D2 connected between the sixth voltage dividing element R6 and the negative charging terminal C-. The positive pole of the second diode D2 is connected with the sixth voltage dividing element R6, and the negative pole of the second diode D2 is used for being connected with the negative pole charging end C-. Therefore, the damage of components caused by reverse connection of the charger can be avoided, and the safety and reliability of the circuit are further improved.

In one embodiment, the first switching transistor Q1 and/or the second switching transistor Q2 may be implemented by using transistors, so as to further reduce the circuit cost. In one example, the first switching transistor Q1 may be an NPN transistor and the second switching transistor Q2 may be a PNP transistor. The controlled end of the first switch tube Q1 is the base electrode of the triode, the first end is the collector electrode of the triode, and the second end is the emitter electrode of the triode. The controlled end of the second switch tube Q2 is the base electrode of the triode, the first end is the emitter electrode of the triode, and the second end is the collector electrode of the triode.

In one embodiment, the utility model also provides a battery system. As shown in fig. 5, the battery system includes a battery pack, a charge-discharge control device, a battery management device, and the charge activation circuit 10 described in any of the above embodiments. The battery pack may include one or more batteries, and the capacity, type, etc. of each battery may be selected according to practical requirements, which is not particularly limited herein, and for example, a plurality of lithium batteries may be connected in series to realize the battery pack. The charge/discharge control device is a device for controlling the charge/discharge state of the battery system. The battery management device is the BMS described above.

Specifically, the battery pack includes a positive electrode input/output terminal and a negative electrode input/output terminal. During discharging, the positive electrode input/output terminal can provide a high level, and the negative electrode input/output terminal can provide a low level. During charging, the positive input and output end of the battery pack can be connected with the positive electrode of the charger, and the negative input and output end of the battery pack can be connected with the negative electrode of the charger.

The positive input/output end of the battery pack can be used as a positive charging end C+ of the battery system, and further, when the positive charging end C+ and the positive discharging end P+ are multiplexed, the positive input/output end can also be used as a positive discharging end P+. The negative input/output end of the battery pack can be used for grounding and is connected with the first end of the charge/discharge control device. The second end of the charge-discharge control device is used as a negative electrode charge end C-of the battery system, the third end of the charge-discharge control device is used as a negative electrode discharge end P-of the battery system, and the controlled ends of the charge-discharge control device are respectively connected with the first control end and the second control end of the battery management device. The charging detection terminal CHG CHK of the battery management device is connected to the first voltage dividing element R1 in the charging activation circuit 10, and the pull-up and pull-down module 120 of the charging activation circuit 10 is connected to the positive charging terminal c+ and the negative charging terminal C-of the battery system, respectively. The specific connection between the charging activation circuit 10 and the battery management device, the positive charging terminal c+ and the negative charging terminal C-can be referred to the description of the above embodiments.

The utility model adopts the first voltage dividing element R1, the first switching tube Q1, the up-down pulling module 120 and the switch driving module 130 to realize the charge activation circuit 10 in the battery system with different charge and discharge ports, has simple circuit structure and does not need to be matched with an isolation circuit, thereby reducing the cost of the battery system.

In one embodiment, as shown in fig. 5, the charge and discharge control device may include a third switching tube Q3 and a fourth switching tube Q4. The device descriptions of the third switching tube Q3 and the fourth switching tube Q4 can refer to the device description of the first switching tube Q1, and are not described herein. For convenience of description, the third switching tube Q3 and the fourth switching tube Q4 are taken as MOSFETs for illustration.

The first end of the third switching tube Q3 is connected with the negative input and output end of the battery pack, the second end of the third switching tube Q3 is connected with the first end of the fourth switching tube Q4, and the controlled end of the third switching tube Q3 is connected with the first control end of the battery management device. The second end of the third switching tube Q3 may serve as the negative discharge end P-of the battery system. The second end of the fourth switching tube Q4 can be used as a negative charging end C-of the battery system, and the controlled end of the fourth switching tube Q4 can be connected with the second control end of the battery management device. Further, the charge and discharge control device may further include a resistor R7, a resistor R8, and a resistor R9, and the connection relationship between the resistor R7, the resistor R8, and the resistor R9 may be as shown in fig. 5.

The battery management device can control the charge and discharge states of the battery system by controlling the on-off of the third switching tube Q3 and the fourth switching tube Q4. When the third switching tube Q3 and the fourth switching tube Q4 are both turned on, the battery system may be in a charged state. When the third switching tube Q3 is turned on and the fourth switching tube Q4 is turned off, the battery system may be in a discharge state.

In the present embodiment, the charge and discharge control device is realized by adopting the third switching tube Q3 and the fourth switching tube Q4, so that the circuit structure can be further simplified and the cost can be reduced.

In one embodiment, as shown in fig. 5, the battery system may further include a voltage conversion device, an input terminal of the voltage conversion device is connected to the positive input/output terminal of the battery pack, and an output terminal of the voltage conversion device is connected to the power supply terminal of the battery management device. Therefore, the battery management device can take energy from the battery pack without adding additional power supply equipment, and the volume and cost of the battery system can be further reduced. Further, the output end of the voltage conversion device may be further connected to the first end of the first voltage dividing element R1 to provide a high level.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Herein, "a," "an," "the," and "the" may also include plural forms, unless the context clearly indicates otherwise. Plural means at least two cases such as 2, 3, 5 or 8, etc. "and/or" includes any and all combinations of the associated listed items. Reference herein to "connected" is to be understood as "electrically connected," "communicatively connected," etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and may be combined according to needs, and the same similar parts may be referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charge activation circuit, the charge activation circuit comprising:

2. The charge activation circuit of claim 1, wherein the switch drive module comprises:

3. The charge activation circuit of claim 2, wherein the voltage dividing unit comprises:

4. The charge activation circuit of claim 2, wherein the switch drive module further comprises:

5. The charge activation circuit of any one of claims 1 to 4, further comprising:

6. The charge activation circuit of claim 5, wherein the charge activation circuit further comprises:

7. The charge activation circuit of any one of claims 1 to 4, wherein the first switching tube is a triode.

8. A battery system, the battery system comprising:

the charge activation circuit according to any one of claims 1 to 7, which is connected to a charge detection terminal of the battery management device, a positive electrode charge terminal of the battery system, and a negative electrode charge terminal of the battery system, respectively.

9. The battery system of claim 8, wherein the battery system further comprises:

10. The battery system according to claim 8 or 9, wherein the charge-discharge control means includes: