Battery system control circuit and battery system

Abstract

The utility model relates to a battery system control circuit and a battery system. The device specifically comprises an analog front-end module, a charging switch drive, a charging switch module, a discharging switch drive, a discharging switch module, a controller and a watchdog module. The watchdog module is connected with the controller, generates a first level when receiving a dog feeding signal generated by the controller, and otherwise, generates a second level; the charging switch is in driving connection with the analog front-end module and the watchdog module and is used for generating a first driving level and turning off the first driving level when receiving a second level; the discharge switch is in driving connection with the analog front-end module and the watchdog module, and is used for generating a second driving level and turning off the second driving level when the second driving level is received; the charging switch module is switched on when receiving a first driving level; the discharge switch module is turned on when receiving the second driving level. Through the process, when the battery system breaks down, the state of the battery system can be directly controlled through the watchdog, and the safety of the battery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more particularly to a battery system control circuit and a battery system. Background Art

[0002] Currently, common lithium battery management systems can be categorized as either pure hardware-based or software-based. Software-based battery management systems typically utilize a microcontroller (MCU) with a running program. However, MCU operation is often subject to interference from external electromagnetic fields, which can disrupt data in various registers and memory, disrupting the MCU-controlled system and causing the entire system to stall, leading to unpredictable consequences. Therefore, a common practice is to add a watchdog function to the MCU to regularly monitor internal chip conditions and issue a reset signal if an error occurs. However, in practice, when a MCU hardware circuit or analog front-end chip fails, even a reset signal from the watchdog may not resolve the problem. Consequently, the battery's operating state may remain uncontrolled for an extended period, rendering it unsafe to operate. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a battery system control circuit and a battery system in view of some of the above technical defects of the prior art.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a battery system control circuit, including: an analog front-end module, a charging switch driver, a charging switch module, a discharge switch driver, a discharge switch module, a controller and a watchdog module;

[0005] The analog front-end module is connected to the controller and is used to obtain the state parameters of the battery pack of the battery system and send them to the controller, and receive the control level generated by the controller;

[0006] The watchdog module is connected to the controller and is configured to generate a first level when receiving a dog feeding signal generated by the controller, and otherwise generate a second level;

[0007] The charging switch is driven to connect the analog front-end module and the watchdog module, and is used to receive the output level of the analog front-end module and generate a first driving level, and turn off the first driving level when receiving the second level;

[0008] The discharge switch is driven to connect the analog front-end module and the watchdog module, and is used to receive the output level of the analog front-end module and generate a second driving level, and turn off the second driving level when receiving the second level;

[0009] The charging switch module is connected to the charging switch driver and is configured to be turned on when receiving the first driving level;

[0010] The discharge switch module is connected to the discharge switch driver and is configured to be turned on when receiving the second drive level;

[0011] The charging switch module and the discharging switch module are connected in series and then connected between the battery pack and the output end of the battery system.

[0012] Preferably, in an embodiment of the battery system control circuit of the present utility model, the watchdog module includes a watchdog chip U2;

[0013] The RESET pin of the watchdog chip U2 is connected to the reset signal receiving end of the controller, the WDI pin of the watchdog chip U2 is connected to the dog feeding signal output end of the controller, and the WDO pin of the watchdog chip U2 is connected to the charging switch driver and the discharging switch driver.

[0014] Preferably, in an embodiment of the battery system control circuit of the present utility model, the discharge switch driver includes a driver chip U3;

[0015] The first input end of the driver chip U3 is connected to the WDO pin of the watchdog chip U2, the second input end of the driver chip U3 is connected to the first level output end of the analog front-end module, and the output end of the driver chip U3 is connected to the control end of the discharge switch module.

[0016] Preferably, in an embodiment of the battery system control circuit of the present utility model, the charging switch drive includes a first sub-switch, a second sub-switch and a third sub-switch;

[0017] The control end of the first sub-switch is connected to the WDO pin of the watchdog chip U2, the first end of the first sub-switch and the second level output end of the analog front-end module are connected to the control end of the second sub-switch, and the first end of the second sub-switch is connected to the control end of the third sub-switch;

[0018] The second end of the first sub-switch and the second end of the second sub-switch are grounded, and the second end of the third sub-switch is connected to the control end of the charging switch module.

[0019] Preferably, in an embodiment of the battery system control circuit of the present utility model, the first sub-switch includes a first resistor and a first transistor;

[0020] The first end of the first resistor is connected to the WDO pin of the watchdog chip U2, the second end of the first resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the control end of the second sub-switch, and the emitter of the first transistor is grounded.

[0021] Preferably, in an embodiment of the battery system control circuit of the present utility model, the second sub-switch includes a second resistor and a second transistor;

[0022] The first end of the second resistor is connected to the second level output end of the analog front-end module, the second end of the second resistor is connected to the base of the second transistor and the first end of the first sub-switch, the collector of the second transistor is connected to the control end of the third sub-switch, and the emitter of the second transistor is grounded.

[0023] Preferably, in an embodiment of the battery system control circuit of the present utility model, the third sub-switch includes a third resistor, a fourth resistor, a fifth resistor, a third transistor and a diode;

[0024] The first end of the third resistor is connected to the first end of the second sub-switch, the second end of the third resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to a power supply, the collector of the third transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the anode of the diode, the cathode of the diode is connected to the control end of the charging switch module and the first end of the fifth resistor, and the second end of the fifth resistor is connected to the output end of the battery system.

[0025] Preferably, in an embodiment of the battery system control circuit described in the present utility model, the WDO end of the watchdog chip U2 is connected to the signal receiving end of the analog front-end module, wherein the analog front-end module enters a sleep state when receiving the second level.

[0026] Preferably, in an embodiment of the battery system control circuit of the present utility model, the charging switch module includes a first MOS transistor, and the discharging switch module includes a second MOS transistor;

[0027] The gate of the first MOS transistor is connected to the charging switch driver, the source of the first MOS transistor is connected to the output end of the battery system, and the drain of the first MOS transistor is connected to the drain of the second MOS transistor;

[0028] The gate of the second MOS transistor is connected to the discharge switch driver, and the source of the second MOS transistor is connected to the negative electrode of the battery pack.

[0029] A battery system in an embodiment of the present invention includes: a battery pack, and the battery system control circuit as described above.

[0030] A battery system control circuit and a battery system implementing the present invention have the following beneficial effects: when a fault occurs in the battery system, the state of the battery system can be directly controlled through the watchdog to ensure the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 This is a module schematic diagram of an embodiment of a battery system control circuit of the present utility model;

[0033] Figure 2 This is a power supply principle diagram of an embodiment of a battery system control circuit of the present utility model. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0035] like Figure 1 As shown in FIG, an embodiment of a battery system control circuit of the present utility model is shown. Figure 1In an embodiment of a battery system control circuit of the present invention shown, the battery system control circuit includes an analog front-end module 110, a charging switch driver 151, a charging switch module 152, a discharge switch driver 141, a discharge switch module 142, a controller 120 and a watchdog module 130; the analog front-end module 110 is connected to the controller 120, and is used to obtain the state parameters of the battery pack 210 of the battery system and send them to the controller 120, and receive the control level generated by the controller 120; the watchdog module 130 is connected to the controller 120, and is used to generate a first level when receiving the dog feeding signal generated by the controller 120, otherwise it generates a second level; the charging switch driver 151 is connected to the analog front-end module 110 and the watchdog module 130, used to receive the output level of the analog front-end module 110 and generate a first drive level, and turn off the first drive level when receiving the second level; the discharge switch driver 141 is connected to the analog front-end module 110 and the watchdog module 130, used to receive the output level of the analog front-end module 110 and generate a second drive level, and turn off the second drive level when receiving the second level; the charging switch module 152 is connected to the charging switch driver 151, and is turned on when receiving the first drive level; the discharging switch module 142 is connected to the discharging switch driver 141, and is turned on when receiving the second drive level; wherein, the charging switch module 152 and the discharging switch module 142 are connected in series and connected between the battery pack 210 and the output end of the battery system.

[0036] Specifically, the battery system control circuit can also be a part of the battery management system. In the battery system control circuit, the status parameters of the batteries in the battery pack are monitored and collected in real time through the analog front-end module 110, wherein the battery status parameters include but are not limited to single cell voltage, battery pole temperature, battery loop current, battery pack terminal voltage, battery system insulation resistance, etc., and the relevant status parameters are processed and sent to the controller 120. The controller 120 can be understood as a power management chip, which is used to output the corresponding control level to achieve control of the working process of the battery system. In the embodiment of the present utility model, the interaction process between the analog front-end module 110 and the controller 120 is not limited, and the process can be achieved through the control process of the current general battery management system. In the embodiment of the present utility model, it is not described. As Figure 2 As shown, in the embodiment of the present invention, the analog front-end module 110 may be composed of an analog front-end chip U4 and its corresponding peripheral circuits. The controller 120 may be composed of an MCU chip U1 and its corresponding peripheral circuits.

[0037] When the controller 120 is working normally, the controller 120 generates a square wave of a fixed frequency and sends it to the watchdog module 130 to implement the dog feeding action on the watchdog module 130. Among them, the square wave generated by the controller 120 can be understood as the generated dog feeding signal. When the watchdog module 130 can normally receive the dog feeding signal, it will normally output the first level. When the watchdog module 130 cannot receive the dog feeding signal, it will output the second level due to timeout. When the circuit is normal, the charging switch driver 151 will receive the output level of the analog front-end module 110 and output the first drive level to drive the charging switch module 152 to the on state through the first drive level. When the circuit is abnormal, the charging switch driver 151 receives the second level output by the watchdog module 130 to turn off the output of the first drive level, so that the charging switch module 152 enters the off state to achieve circuit protection. Similarly. When all circuits are normal, the discharge switch driver 141 receives the output level of the analog front-end module 110 and outputs a second drive level, thereby driving the discharge switch module 142 into an on state through the second drive level. When the circuit is abnormal, the discharge switch driver 141 receives the second level output by the watchdog module 130 to shut off the output of the second drive level, causing the discharge switch module 142 to enter an off state to achieve circuit protection. The charging switch module 152 and the discharge switch module 142 are connected in series and connected between the battery pack 210 and the output terminal of the battery system to provide charging and discharging protection for the battery pack 210. Its normal operating process is controlled by the analog front-end module 110. This control process can be implemented through the control process of a currently common battery management system and is not limited in this utility model.

[0038] like Figure 2As shown, in one embodiment, the watchdog module 130 includes a watchdog chip U2; the RESET pin of the watchdog chip U2 is connected to the reset signal receiving end of the controller 120, the WDI pin of the watchdog chip U2 is connected to the feeding signal output end of the controller 120, and the WDO pin of the watchdog chip U2 is connected to the charging switch driver 151 and the discharging switch driver 141. Specifically, the watchdog module 130 can be composed of the watchdog chip U2. In one embodiment, the watchdog module 130 can also include the peripheral circuit of the watchdog chip U2. When the watchdog module 130 is working, the feeding signal generated by the controller 120 is received through the WDI pin of the watchdog chip U2. When the watchdog chip U2 receives a normal feeding signal, the output level of the RESET pin of the watchdog chip U2 is maintained in a normal state, for example, maintained in a high impedance state, and the controller 120 maintains a normal working state. At the same time, the WDO pin of the watchdog chip U2 outputs a first level, and the charging switch driver 151 and the discharging switch driver 141 do not operate when receiving the first level. At this time, the charging switch driver 151 and the discharging switch driver 141 are controlled by the analog front-end module 110. When the controller 120 abnormally interrupts the output of the dog feeding signal, the watchdog chip U2 cannot receive the dog feeding signal, and the switching output level of the RESET pin of the watchdog chip U2, for example, outputs a low-level pulse, attempts to trigger the controller 120 to reset. At the same time, the WDO pin of the watchdog chip U2 outputs a second level, and the charging switch driver 151 and the discharging switch driver 141 are controlled by the second level. When the controller 120 is reset, it will output the dog feeding signal to the watchdog chip U2 again, and the watchdog chip U2 will resume its normal working state, and the corresponding other related circuits will also return to normal.

[0039] like Figure 2As shown, in one embodiment, the discharge switch driver 141 includes a driver chip U3; a first input terminal of the driver chip U3 is connected to the WDO pin of the watchdog chip U2, a second input terminal of the driver chip U3 is connected to the first level output terminal of the analog front-end module 110, and an output terminal of the driver chip U3 is connected to the control terminal of the discharge switch module 142. Specifically, the discharge switch driver 141 can be composed of the driver chip U3. In one embodiment, the discharge switch driver 141 can also include peripheral circuits of the driver chip U3. The first input terminal of the discharge driver chip U3 is used to receive the output level of the WDO pin of the watchdog chip U2, and the second input terminal of the discharge driver chip U3 is used to receive the output level of the first level output terminal of the analog front-end module 110. The output terminal of the discharge driver chip U3 is used to output a first drive level to turn on the discharge switch module 142. When the first input terminal of the discharge driver chip U3 receives the first level, the output level of the output terminal of the discharge driver chip U3 is controlled by the input level of the second input terminal of the discharge driver chip U3. When the first input terminal of the discharge driving chip U3 receives the second level, the output level of the output terminal of the discharge driving chip U3 is controlled by the input level of the first input terminal of the discharge driving chip U3 .

[0040] like Figure 2 As shown, in one embodiment, the charging switch driver 151 includes a first sub-switch 1511, a second sub-switch 1512, and a third sub-switch 1513. The control end of the first sub-switch 1511 is connected to the WDO pin of the watchdog chip U2. The first end of the first sub-switch 1511 and the second level output end of the analog front-end module 110 are connected to the control end of the second sub-switch 1512. The first end of the second sub-switch 1512 is connected to the control end of the third sub-switch 1513. The second end of the first sub-switch 1511 and the second end of the second sub-switch 1512 are grounded, and the second end of the third sub-switch 1513 is connected to the control end of the charging switch module 152. Specifically, in the charging switch driver 151, the state of the second sub-switch 1512 can be controlled by the first sub-switch 1511, and the state of the third sub-switch 1513 can be controlled by the second sub-switch 1512, ultimately controlling the output level of the charging switch driver 151. For example, when the control terminal of the first sub-switch 1511 receives a first level outputted by the WDO pin of the watchdog chip U2, the state of the second sub-switch 1512 is controlled by the output level of the second level output terminal of the analog front-end module 110, which in turn controls the state of the third sub-switch 1513 to control the output state of the second drive level. When the control terminal of the first sub-switch 1511 receives a second level outputted by the WDO pin of the watchdog chip U2, the state of the second sub-switch 1512 is controlled by the first sub-switch 1511, which in turn controls the state of the third sub-switch 1513 to control the output state of the second drive level.

[0041] In a specific embodiment, the first sub-switch 1511 includes a first resistor and a first transistor; the first end of the first resistor is connected to the WDO pin of the watchdog chip U2, the second end of the first resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the control end of the second sub-switch 1512, and the emitter of the first transistor is grounded. Figure 2 As shown, the first sub-switch 1511 is composed of a transistor Q1 (corresponding to the first transistor) and a resistor R1 (corresponding to the first resistor). The state of transistor Q1 is controlled by the output level of the WDO pin of the watchdog chip U2. When transistor Q1 is off, the state of the second sub-switch 1512 is controlled by the output level of the second level output terminal of the analog front-end module 110. When transistor Q1 is on, the state of the second sub-switch 1512 is fixed directly because the collector of transistor Q1 is at a low level.

[0042] In a specific embodiment, the second sub-switch 1512 includes a second resistor and a second transistor; the first end of the second resistor is connected to the second level output terminal of the analog front-end module 110, the second end of the second resistor is connected to the base of the second transistor and the first end of the first sub-switch 1511, the collector of the second transistor is connected to the control terminal of the third sub-switch 1513, and the emitter of the second transistor is grounded. Figure 2 As shown, the second sub-switch 1512 is composed of a transistor Q2 (corresponding to the second transistor) and a resistor R2 (corresponding to the second resistor). When the first sub-switch 1511 is off, the output of the second level output terminal of the analog front-end module 110 is input to the transistor Q2 via the resistor R2 to control the state of the transistor Q2. When the first sub-switch 1511 is on, the base of the transistor Q2 is maintained at a low level, and the transistor Q2 is always in the off state. That is, the state of the transistor Q2 at this time is determined by the state of the first sub-switch 1511.

[0043] In one specific embodiment, the third sub-switch 1513 includes a third resistor, a fourth resistor, a fifth resistor, a third transistor, and a diode. The first end of the third resistor is connected to the first end of the second sub-switch 1512, the second end of the third resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to a power supply, the collector of the third transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the anode of the diode, the cathode of the diode is connected to the control end of the charging switch module 152 and the first end of the fifth resistor, and the second end of the fifth resistor is connected to the output end of the battery system. Specifically, the third sub-switch 1513 includes a resistor R3 (corresponding to the third resistor), a resistor R4 (corresponding to the fourth resistor), and a resistor R5 (corresponding to the fifth resistor), as well as a transistor Q3 (corresponding to the third transistor) and a diode D1. The transistor Q3 is turned on or off depending on the state of the second sub-switch 1512. When the transistor Q3 is on, the output level of the collector of the transistor Q3 drives the charging switch module 152 to turn on. When the transistor Q3 is off, the transistor Q3 blocks the output level. Then the charging switch module 152 is turned off.

[0044] In a specific embodiment, the charging switch driver 151 can be implemented by combining the specific circuits of the first sub-switch 1511 , the second sub-switch 1512 , and the third sub-switch 1513 described above.

[0045] In one embodiment, if Figure 2 As shown, the WDO terminal of the watchdog chip U2 is connected to the signal receiving terminal of the analog front-end module 110, wherein the analog front-end module 110 enters a dormant state upon receiving a second level. That is, when the controller 120 is abnormal, while the charging switch module 152 and the discharging switch module 142 of the battery system are shut down by the watchdog chip U2, the analog front-end module 110 can also be forced to sleep and enter a low-power state through the second level output by the watchdog chip U2. The process of the analog front-end module 110 entering the dormant state is determined by the specific chip characteristics in the analog front-end module 110, that is, the specific chip is triggered to work by the level received by its corresponding pin. In the embodiment of the present utility model, it is only emphasized that the output level of the WDO terminal of the watchdog chip U2 is used to trigger the specific chip to enter a specific working state. When the controller 120 is reset, it will output the dog feeding signal to the watchdog chip U2 again, and the watchdog chip will resume its normal working state, and the analog front-end module 110 will also resume its normal working state.

[0046] In a specific embodiment, the charging switch module 152 includes a first MOS transistor, and the discharging switch module 142 includes a second MOS transistor; the gate of the first MOS transistor is connected to the charging switch driver 151, the source of the first MOS transistor is connected to the output end of the battery system, and the drain of the first MOS transistor is connected to the drain of the second MOS transistor; the gate of the second MOS transistor is connected to the discharging switch driver 141, and the source of the second MOS transistor is connected to the negative electrode of the battery pack 210. Figure 2 As shown, the first MOS transistor may include a CMOS transistor CMOS1, and the second MOS transistor may include a DMOS transistor DMOS1. A discharge switch driver 141 drives the state of the DMOS transistor DMOS1. A charge switch driver 151 drives the state of the CMOS transistor CMOS1. The DMOS transistor DMOS1 and the CMOS transistor CMOS1 are connected in series to connect the negative output terminal P- of the battery system and the negative electrode of the battery pack 210.

[0047] like Figure 2 As shown, in one specific embodiment, the first level output by the WDO pin of the watchdog chip U2 is a low level, and the second level is a high level. When the WDO pin of the watchdog chip U2 outputs a low level, the driving voltage of the DMOS transistor DMOS1 is controlled by the signal AFEDO output by the analog front-end chip U4, and the driving voltage of the CMOS transistor CMOS1 is controlled by the signal AFECO output by the analog front-end chip U4, and the analog front-end chip U4 operates normally. When the WDO pin of the watchdog chip U2 outputs a high level, the first input terminal (IN-pin) of the driver chip U3 corresponding to the DMOS transistor DMOS1 is high, and the output terminal (OUT pin) is locked to a low level, ensuring that the DMOS transistor DMOS1 is in the off state. The base of transistor Q1 is pulled high by resistor R1 and is in the on state. The base voltage of transistor Q2 is pulled low, transistor Q3 is cut off, and then transistor Q3 is cut off. CMOS tube CMOS1 is locked in the off state, and the PDOWN pin of analog front-end chip U4 is pulled high. Analog front-end chip U4 is forced to sleep and enters low power consumption state.

[0048] In an embodiment of the present invention, a battery system includes a battery pack 210 and a battery system control circuit. The control circuit protects the battery system by preventing the battery pack 210 from charging or discharging when the battery system is uncontrolled, thereby preventing circuit damage.

[0049] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A battery system control circuit, characterized in that: include: Analog front-end module, charging switch driver, charging switch module, discharging switch driver, discharging switch module, controller and watchdog module; The analog front-end module is connected to the controller and is used to obtain the state parameters of the battery pack of the battery system and send them to the controller, and receive the control level generated by the controller; The watchdog module is connected to the controller and is configured to generate a first level when receiving a dog feeding signal generated by the controller, and otherwise generate a second level; The charging switch is driven to connect the analog front-end module and the watchdog module, and is used to receive the output level of the analog front-end module and generate a first driving level, and turn off the first driving level when receiving the second level; The discharge switch is driven to connect the analog front-end module and the watchdog module, and is used to receive the output level of the analog front-end module and generate a second driving level, and turn off the second driving level when receiving the second level; The charging switch module is connected to the charging switch driver and is configured to be turned on when receiving the first driving level; The discharge switch module is connected to the discharge switch driver and is configured to be turned on when receiving the second drive level; The charging switch module and the discharging switch module are connected in series and then connected between the battery pack and the output end of the battery system.

2. The battery system control circuit according to claim 1, characterized in that: The watchdog module includes a watchdog chip U2; The RESET pin of the watchdog chip U2 is connected to the reset signal receiving end of the controller, the WDI pin of the watchdog chip U2 is connected to the dog feeding signal output end of the controller, and the WDO pin of the watchdog chip U2 is connected to the charging switch driver and the discharging switch driver.

3. The battery system control circuit according to claim 2, characterized in that: The discharge switch driver includes a driver chip U3; The first input end of the driver chip U3 is connected to the WDO pin of the watchdog chip U2, the second input end of the driver chip U3 is connected to the first level output end of the analog front-end module, and the output end of the driver chip U3 is connected to the control end of the discharge switch module.

4. The battery system control circuit according to claim 2, characterized in that: The charging switch driver includes a first sub-switch, a second sub-switch and a third sub-switch; The control end of the first sub-switch is connected to the WDO pin of the watchdog chip U2, the first end of the first sub-switch and the second level output end of the analog front-end module are connected to the control end of the second sub-switch, and the first end of the second sub-switch is connected to the control end of the third sub-switch; The second end of the first sub-switch and the second end of the second sub-switch are grounded, and the second end of the third sub-switch is connected to the control end of the charging switch module.

5. The battery system control circuit according to claim 4, characterized in that: The first sub-switch includes a first resistor and a first transistor; The first end of the first resistor is connected to the WDO pin of the watchdog chip U2, the second end of the first resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the control end of the second sub-switch, and the emitter of the first transistor is grounded.

6. The battery system control circuit according to claim 4, characterized in that: The second sub-switch includes a second resistor and a second transistor; The first end of the second resistor is connected to the second level output end of the analog front-end module, the second end of the second resistor is connected to the base of the second transistor and the first end of the first sub-switch, the collector of the second transistor is connected to the control end of the third sub-switch, and the emitter of the second transistor is grounded.

7. The battery system control circuit according to claim 4, characterized in that: The third sub-switch includes a third resistor, a fourth resistor, a fifth resistor, a third triode and a diode; The first end of the third resistor is connected to the first end of the second sub-switch, the second end of the third resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to a power supply, the collector of the third transistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the anode of the diode, the cathode of the diode is connected to the control end of the charging switch module and the first end of the fifth resistor, and the second end of the fifth resistor is connected to the output end of the battery system.

8. The battery system control circuit according to claim 2, characterized in that: The WDO terminal of the watchdog chip U2 is connected to the signal receiving terminal of the analog front-end module, wherein the analog front-end module enters a sleep state when receiving the second electrical level.

9. The battery system control circuit according to claim 1, characterized in that: The charging switch module includes a first MOS transistor, and the discharging switch module includes a second MOS transistor; The gate of the first MOS transistor is connected to the charging switch driver, the source of the first MOS transistor is connected to the output end of the battery system, and the drain of the first MOS transistor is connected to the drain of the second MOS transistor; The gate of the second MOS transistor is connected to the discharge switch driver, and the source of the second MOS transistor is connected to the negative electrode of the battery pack.

10. A battery system, characterized in that: include: A battery pack, and a battery system control circuit according to any one of claims 1 to 9.

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