Battery management system and battery charging system capable of repeating dormancy

Abstract

The invention discloses a battery management system capable of sleeping repeatedly and a battery charging system.The battery management system is provided with a first awakening module and a second awakening module to awaken a DCDC module and a control module respectively, and the first access end of the first awakening module and the second access end of the second awakening module are electrically connected with an auxiliary source of a charger; a second signal end of the second wake-up module is electrically connected with a third access end of the control module, a first signal end of the first wake-up module and the third signal end of the control module are electrically connected with a fourth access end of the DCDC module, the first wake-up module is used for outputting a wake-up signal to the DCDC module according to a trigger signal of an auxiliary source, the DCDC module supplies power to the control module, and the DCDC module supplies power to the control module. And the control module continuously outputs the wake-up signal to the DCDC module, and the control module judges whether to continuously output the wake-up signal to the DCDC module according to the charging detection signal and the charging condition, so that the repeatable dormancy of the battery management system is realized, the continuous discharging of the battery is favorably avoided, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery charging technology, and more particularly to a battery management system and a battery charging system capable of repeated dormancy. Background Technology

[0002] In low-voltage energy storage power supplies, the battery management system (BMS) of the energy storage battery is generally equipped with a charging wake-up circuit to control the battery charging wake-up. Referring to Chinese patent CN212304824U, in the initial state, the charging MOSFET of the battery's power circuit is off. The conventional charging wake-up method is to compare the external charging voltage and the battery voltage through a transistor or MOSFET. When the external voltage is higher, the transistor / MOSFET turns on, and the activation signal is connected to the AFE or DC-DC converter to wake up the battery BMS. The battery BMS then determines and controls whether the charging MOSFET of the power circuit is turned on to charge the battery. However, when the charging activation signal is connected but the charging conditions are not met (e.g., the temperature is too low), the BMS can neither switch to the charging state nor enter the low-power sleep state again. Since the charging activation signal will be maintained, the BMS will always be in the active state, and the battery will continue to consume power until undervoltage or over-discharge occurs, which will seriously affect the battery's service life. Summary of the Invention

[0003] The purpose of this invention is to provide a battery management system capable of repeated dormancy, which helps to avoid continuous battery discharge and improve battery life.

[0004] Another object of the present invention is to provide a battery charging system in which the battery management system can repeatedly enter a dormant state, which helps to avoid continuous battery discharge and improve battery life.

[0005] To achieve the above objectives, the present invention discloses a battery management system capable of repeated hibernation, comprising: The system consists of a first wake-up module, a second wake-up module, a control module, and a DC-DC module. The first wake-up module is provided with a first access terminal and a first signal terminal, the second wake-up module is provided with a second access terminal and a second signal terminal, the control module is provided with a third access terminal and a third signal terminal, the DC-DC module is provided with a fourth access terminal, the first access terminal and the second access terminal are electrically connected to the auxiliary power supply of the charger, the second signal terminal is electrically connected to the third access terminal, the first signal terminal and the third signal terminal are electrically connected to the fourth access terminal, and the DC-DC module is connected to the power supply terminal of the control module; The first wake-up module is used to output a wake-up signal to the DC-DC module according to the trigger signal of the auxiliary power input of the charger. The DC-DC module is used to supply power to the control module when receiving the wake-up signal. The control module is used to continuously output the wake-up signal to the DC-DC module to maintain the power supply to the DC-DC module. The second wake-up module is used to output a charging detection signal to the control module according to the trigger signal input from the auxiliary power source of the charger. When the control module receives the charging detection signal, it is used to either continuously output a wake-up signal to the DC-DC module or stop outputting a wake-up signal to the DC-DC module according to the charging conditions.

[0006] Preferably, the first wake-up module includes a first on / off unit, a switching unit, and a first isolation unit. The first on / off unit is provided with a first input terminal, a first control terminal, and a first output terminal. The switching unit is provided with a second control terminal. The first isolation unit includes a first trigger terminal and a first response terminal. The first input terminal is connected to the auxiliary power source of the charger. The first control terminal is connected to the second control terminal. The first trigger terminal is connected to the first output terminal. The first response terminal is connected to the fourth access terminal of the DC-DC module. When the auxiliary power input trigger signal of the charger is received, the switching unit is used to control the first input terminal and the first output terminal to be turned on for a period of time and then turned off, so that the trigger signal input to the first trigger terminal is interrupted after a period of time. The first isolation unit is used to control the first reaction terminal to be turned on for a period of time and then turned off according to the received trigger signal, so that the fourth access terminal of the DC-DC module receives a low level signal for a period of time and then resumes receiving a high level signal.

[0007] Preferably, the first switching unit includes a first capacitor, a first resistor, and a PMOS transistor; the switching unit includes a PNP transistor and a second capacitor; the first isolation unit includes a first optocoupler; the first terminals of the first capacitor and the first resistor, and the second terminal of the PMOS transistor are connected to the auxiliary power supply of the charger; the second terminals of the first capacitor and the first resistor, and the first terminal of the PMOS transistor are connected to the first and second terminals of the PNP transistor and the first terminal of the second capacitor; the third terminal of the PNP transistor and the second terminal of the second capacitor are connected to ground; the third terminal of the PMOS transistor is connected to the first terminal of the first optocoupler; the fourth terminal of the first optocoupler is connected to the fourth input terminal of the DC-DC module; and the second and third terminals of the first optocoupler are connected to ground.

[0008] Preferably, the second wake-up module includes a second isolation unit, which includes a second trigger terminal and a second response terminal. The second trigger terminal is connected to the auxiliary power source of the charger, and the second response terminal and the third access terminal of the control module are connected to the power source. When the auxiliary power source of the charger inputs a trigger signal, the second isolation unit is used to control the second response terminal to conduct according to the received trigger signal, so that the third access terminal of the control module receives a low-level signal.

[0009] Preferably, the second isolation unit includes a second optocoupler, the first terminal of the second optocoupler is connected to the auxiliary power supply of the charger, the fourth terminal of the second optocoupler and the third access terminal of the control module are connected to a 3V power supply, and the second and third terminals of the second optocoupler are connected to ground.

[0010] Preferably, the control module includes a controller and a second on / off unit. The second on / off unit is provided with a third input terminal, a third control terminal, and a third output terminal. The controller is connected to the third control terminal and is used to control the third input terminal and the third output terminal to switch between connected and disconnected, so that the fourth access terminal of the DC-DC module switches between continuously receiving a low-level signal and resuming receiving a high-level signal.

[0011] Preferably, the second switching unit includes an NMOS transistor, the first terminal of which is connected to the controller, the second terminal of which is connected to ground, and the third terminal of which is connected to the fourth access terminal.

[0012] To achieve the above objectives, the present invention discloses a battery charging system comprising: The battery, charger, and battery management system capable of repeated hibernation as described above, wherein the battery is provided with a positive terminal and a negative terminal, the charger is provided with a first DC output terminal, a second DC output terminal, an isolated auxiliary power output terminal, and a first DIDO control terminal, and the battery management system further includes a CHG switch and a DSG switch connected in series, and a second DIDO control terminal, wherein the first DC output terminal is electrically connected to the DSG switch, the CHG switch is electrically connected to the positive terminal, the second DC output terminal is electrically connected to the negative terminal, the isolated auxiliary power output terminal is electrically connected to the first access terminal and the second access terminal, and the first DIDO control terminal and the second DIDO control terminal are electrically connected.

[0013] Compared with the prior art, the present invention provides a first wake-up module and a second wake-up module to wake up the DC-DC module and the control module respectively. The first access terminal of the first wake-up module and the second access terminal of the second wake-up module are electrically connected to the auxiliary power source of the charger. The second signal terminal of the second wake-up module is electrically connected to the third access terminal of the control module. The first signal terminal of the first wake-up module and the third signal terminal of the control module are electrically connected to the fourth access terminal of the DC-DC module. The first wake-up module is used to output a wake-up signal to the DC-DC module according to the trigger signal of the auxiliary power source. The DC-DC module supplies power to the control module. The control module continuously outputs the wake-up signal to the DC-DC module. The control module determines whether to continue to output the wake-up signal to the DC-DC module according to the charging detection signal output by the second wake-up module and the charging conditions, so as to realize the repeatable hibernation of the battery management system, which helps to avoid continuous battery discharge and improve battery life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the battery charging system according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the battery management system capable of repeated hibernation according to an embodiment of the present invention.

[0016] Figure 3 This is a circuit diagram of a battery management system capable of repeated sleep cycles according to an embodiment of the present invention. Detailed Implementation

[0017] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please see Figures 1 to 3 This invention discloses a battery management system 100 capable of repeated hibernation, comprising: The system comprises a first wake-up module 1, a second wake-up module 2, a control module 3, and a DC-DC module 4. The first wake-up module 1 is provided with a first access terminal 11 and a first signal terminal 12, the second wake-up module 2 is provided with a second access terminal 21 and a second signal terminal 22, the control module 3 is provided with a third access terminal 31 and a third signal terminal 32, and the DC-DC module 4 is provided with a fourth access terminal 41. The first access terminal 11 and the second access terminal 21 are electrically connected to the auxiliary power source 201 of the charger 200, the second signal terminal 22 is electrically connected to the third access terminal 31, the first signal terminal 12 and the third signal terminal 32 are electrically connected to the fourth access terminal 41, and the DC-DC module 4 is connected to the power supply terminal of the control module 3. The first wake-up module 1 is used to output a wake-up signal (WAKE_UP) to the DC-DC module 4 according to the trigger signal input from the auxiliary power source 201 of the charger 200. The DC-DC module 4 is used to supply power to the control module 3 when receiving the wake-up signal. The control module 3 is used to continuously output the wake-up signal (WAKE_UP) to the DC-DC module 4 to maintain the power supply to the DC-DC module 4. The second wake-up module 2 is used to output a charging detection signal (CHG_IN) to the control module 3 according to the trigger signal input from the auxiliary power source 201 of the charger 200. When the control module 3 receives the charging detection signal (CHG_IN), it can either continue to output a wake-up signal to the DC-DC module 4 or stop outputting a wake-up signal to the DC-DC module 4 according to the charging conditions.

[0019] Compared with the prior art, the present invention provides a first wake-up module 1 and a second wake-up module 2 to wake up the DC-DC module 4 and the control module 3 respectively. The first access terminal 11 of the first wake-up module 1 and the second access terminal 21 of the second wake-up module 2 are electrically connected to the auxiliary power source 201 of the charger 200. The second signal terminal 22 of the second wake-up module 2 is electrically connected to the third access terminal 31 of the control module 3. The first signal terminal 12 of the first wake-up module 1 and the third signal terminal 32 of the control module 3 are electrically connected to the fourth access terminal 41 of the DC-DC module 4. The first wake-up module 1 is used to output a wake-up signal to the DC-DC module 4 according to the trigger signal of the auxiliary power source 201. The DC-DC module 4 supplies power to the control module 3. The control module 3 continuously outputs the wake-up signal to the DC-DC module 4. The control module 3 determines whether to continue outputting the wake-up signal to the DC-DC module 4 according to the charging detection signal output by the second wake-up module 2 and the charging conditions, so as to realize the repeatable hibernation of the battery management system 100, which helps to avoid the continuous discharge of the battery 300 and improve the service life of the battery 300.

[0020] See Figures 1 to 3 The first wake-up module 1 includes a first on / off unit 13, a switching unit 14, and a first isolation unit 15. The first on / off unit 13 is provided with a first input terminal 131, a first control terminal 132, and a first output terminal 133. The switching unit 14 is provided with a second control terminal 141. The first isolation unit 15 includes a first trigger terminal 151 and a first response terminal 152. The first input terminal 131 is connected to the auxiliary power source 201 of the charger 200, the first control terminal 132 is connected to the second control terminal 141, the first trigger terminal 151 is connected to the first output terminal 133, and the first response terminal 152 is connected to the fourth access terminal 41 of the DC-DC module 4. When the auxiliary power source 201 of the charger 200 inputs a trigger signal, the switching unit 14 controls the first input terminal 131 and the first output terminal 133 to be turned on for a period of time and then turned off, so that the trigger signal is input to the first trigger terminal 151 for a period of time and then interrupted. The first isolation unit 15 controls the first response terminal 152 to be turned on for a period of time and then turned off according to the received trigger signal, so that the fourth access terminal 41 of the DC-DC module 4 receives a low-level signal for a period of time and then resumes receiving a high-level signal.

[0021] The trigger signal input from the auxiliary power source 201 of the charger 200 wakes up the DC-DC module 4 while effectively preventing the DC-DC module 4 from being continuously activated by the auxiliary power source 201 of the charger 200, which is beneficial to the realization of the BMS's repeatable sleep mode.

[0022] Preferably, the first switching unit 13 includes a first capacitor C1, a first resistor R1, and a PMOS transistor Q1; the switching unit 14 includes a PNP transistor Q3 and a second capacitor C2; the first isolation unit 15 includes a first optocoupler U1; the first terminals of the first capacitor C1 and the first resistor R1, and the second terminal of the PMOS transistor Q1 are connected to the auxiliary power source 201 of the charger 200; the second terminals of the first capacitor C1 and the first resistor R1, and the first terminal of the PMOS transistor Q1 are connected to the first and second terminals of the PNP transistor Q3 and the first terminal of the second capacitor C2; the third terminal of the PNP transistor Q3 and the second terminal of the second capacitor C2 are connected to ground GND; the third terminal of the PMOS transistor Q1 is connected to the first terminal of the first optocoupler U1; the fourth terminal of the first optocoupler U1 is connected to the fourth access terminal 41 of the DC-DC module 4; and the second and third terminals of the first optocoupler U1 are connected to ground GND.

[0023] It is understood that in this embodiment, when the battery 300 is in a dormant state and the charger 200 is connected to the AC input, the initial voltage of the first capacitor C1 and the second capacitor C2 is 0. After the auxiliary power source 201 of the AC charger 200 isolates the 12V input, the first capacitor C1 is turned on, the PNP transistor Q3 is turned off, the second capacitor C2 is turned on, the PMOS transistor Q1 is turned on, the first optocoupler U1 is turned on, and the fourth access terminal 41 of the DC-DC module 4 receives a low-level signal (WAKE_UP) to realize the charging wake-up under the battery BMS dormant condition. At the same time, the second capacitor C2 starts charging. The second capacitor C2 needs to be charged for a period of time. After the second capacitor C2 is charged, it is disconnected. The PNP transistor Q3 is turned on, the PMOS transistor Q1 is turned off, the first optocoupler U1 is disconnected, and the fourth access terminal 41 of the DC-DC module 4 can no longer receive low-level signals through the first wake-up module 1. The control module 3 determines whether the fourth access terminal 41 of the DC-DC module 4 receives low-level signals or high-level signals.

[0024] See Figures 1 to 3The second wake-up module 2 includes a second isolation unit 23, which includes a second trigger terminal 231 and a second response terminal 232. The second trigger terminal 231 is connected to the auxiliary power source 201 of the charger 200, and the second response terminal 232 and the third access terminal 31 of the control module 3 are connected to the power supply. When the auxiliary power source 201 of the charger 200 receives a trigger signal, the second isolation unit 23 is used to control the second response terminal 232 to conduct according to the received trigger signal, so that the third access terminal 31 of the control module 3 receives a low-level signal.

[0025] The trigger signal input from the auxiliary power source 201 of the charger 200 is converted into a charging detection signal (CHG_IN) and input to the control module 3 to realize the charging detection of the BMS.

[0026] Preferably, the second isolation unit 23 includes a second optocoupler U2, the first terminal of the second optocoupler U2 is connected to the auxiliary power source 201 of the charger 200, the fourth terminal of the second optocoupler U2 and the third access terminal 31 of the control module 3 are connected to a 3V power supply, and the second and third terminals of the second optocoupler U2 are connected to ground GND.

[0027] It is understood that in this embodiment, when the auxiliary power source 201 of the AC charger 200 isolates the 12V input to the first pole of the second optocoupler U2, the second optocoupler U2 is turned on, the 3V power supply is grounded through the first pole of the second optocoupler U2, the third access terminal 31 of the control module 3 receives a low-level signal (CHG_IN), and the BMS detects that the charging input is valid.

[0028] See Figures 1 to 3 The control module 3 includes a controller MCN and a second on / off unit 33. The second on / off unit 33 is provided with a third input terminal 331, a third control terminal 332 and a third output terminal 333. The controller MCN is connected to the third control terminal 332. The controller MCN is used to control the third input terminal 331 and the third output terminal 333 to switch between connected and disconnected, so that the fourth access terminal 41 of the DC-DC module 4 switches between continuously receiving a low-level signal and resuming receiving a high-level signal.

[0029] The second wake-up module 2 enables BMS charging detection and, based on charging conditions, controls the power-on and power-off of the DC-DC module 4 to achieve repetitive sleep mode for the BMS, preventing it from being continuously activated.

[0030] Preferably, the second switching unit 33 includes an NMOS transistor Q2, the first terminal of which is connected to the controller MCN, the second terminal of which is connected to ground GND, and the third terminal of which is connected to the fourth access terminal 41.

[0031] It is understood that in this embodiment, when the auxiliary power source 201 of the AC charger 200 isolates the 12V input and activates the DC-DC module 4 through the first wake-up module 1, the controller MCU is powered by the DC-DC module 4 and works normally. The controller MCU will output a high-level signal (MCU_LOCK) to control the NMOS transistor Q2 to turn on, so as to latch the low-level signal received by the DC-DC module 4 and maintain the normal power-on of the DC-DC module 4 of the BMS.

[0032] When the auxiliary power source 201 of the AC charger 200 isolates the 12V input to the second wake-up module 2, the third access terminal 31 of the control module 3 will receive a low-level signal (CHG_IN), detecting that the charging input is valid. The controller MCN then determines whether the charging conditions are met. When the charging conditions are met, the controller MCU will output a high-level signal to control the NMOS transistor Q2 to conduct, keep the DC-DC module 4 powered on and control the BMS to switch to the charging state, and the battery 300 will enter the normal charging process. When charging conditions are not met (e.g., the temperature is too low), although the 12V auxiliary power supply 201 signal is continuously input to the second wake-up module 2, the second optocoupler U2 remains on, and the control module 3 detects that the charging input is valid, the first on / off unit 13 of the first wake-up module 1 is off at this time. The fourth access terminal 41 of the DC-DC module 4 can no longer receive a low-level signal through the first wake-up module 1. Whether the fourth access terminal 41 of the DC-DC module 4 receives a low-level signal or a high-level signal is determined only by the control module 3. Therefore, the normal power-down sleep state of the BMS can be achieved through the control module 3. The controller MCU will output a low-level signal to control the NMOS transistor Q2 to turn off, and the fourth access terminal 41 of the DC-DC module 4 will receive a high-level signal. The BMS will re-enter the low-power sleep state until the AC input is plugged in or unplugged again.

[0033] Please see Figures 1 to 3 This invention discloses a battery charging system, which includes: The battery 300, charger 200, and battery management system 100 capable of repeated hibernation as described above are included. The battery 300 is provided with a positive terminal and a negative terminal. The charger 200 is provided with a first DC output terminal 202, a second DC output terminal 203, an isolated auxiliary power output terminal 204, and a first DIDO control terminal 205. The battery management system 100 also includes a CHG switch 101 and a DSG switch 102 connected in series, and a second DIDO control terminal 103. The first DC output terminal 202 is electrically connected to the DSG switch 102, the CHG switch 101 is electrically connected to the positive terminal, the second DC output terminal 203 is electrically connected to the negative terminal, the isolated auxiliary power output terminal 204 is electrically connected to the first access terminal 11 and the second access terminal 21, and the first DIDO control terminal 205 and the second DIDO control terminal 103 are electrically connected.

[0034] It is understood that in this embodiment, when an AC input is connected to the AC charger 200, the isolated auxiliary power source 201 of the charger 200 outputs a 12V signal through the isolated auxiliary power source output terminal 204 to wake up the DC-DC module 4 of the battery management system 100 through the first wake-up module 1, and sends a low-level signal (CHG_IN) to the control module 3 through the second wake-up module 2, so that the BMS detects that the charging input is valid. However, it is not limited to this. The battery charging system is also equipped with a button module, which can wake up the DC-DC module 4 through the button module. Then, the control module 3 determines whether the charging conditions are met. When the charging conditions are met, the BMS switches to the charging state. The BMS sends a DIDO signal to the charger 200 through the first DIDO control terminal 205 and the second DIDO control terminal 103 to modulate the DC voltage and DC current output, and the battery enters the normal charging process.

[0035] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A battery management system capable of repeated hibernation, characterized in that, include: The system consists of a first wake-up module, a second wake-up module, a control module, and a DC-DC module. The first wake-up module is provided with a first access terminal and a first signal terminal, the second wake-up module is provided with a second access terminal and a second signal terminal, the control module is provided with a third access terminal and a third signal terminal, the DC-DC module is provided with a fourth access terminal, the first access terminal and the second access terminal are electrically connected to the auxiliary power supply of the charger, the second signal terminal is electrically connected to the third access terminal, the first signal terminal and the third signal terminal are electrically connected to the fourth access terminal, and the DC-DC module is connected to the power supply terminal of the control module; The first wake-up module is used to output a wake-up signal to the DC-DC module according to the trigger signal of the auxiliary power input of the charger. The DC-DC module is used to supply power to the control module when receiving the wake-up signal. The control module is used to continuously output the wake-up signal to the DC-DC module to maintain the power supply to the DC-DC module. The second wake-up module is used to output a charging detection signal to the control module according to the trigger signal input from the auxiliary power source of the charger. When the control module receives the charging detection signal, it is used to either continuously output a wake-up signal to the DC-DC module or stop outputting a wake-up signal to the DC-DC module according to the charging conditions.

2. The battery management system capable of repeated hibernation according to claim 1, characterized in that, The first wake-up module includes a first on / off unit, a switching unit, and a first isolation unit. The first on / off unit is provided with a first input terminal, a first control terminal, and a first output terminal. The switching unit is provided with a second control terminal. The first isolation unit includes a first trigger terminal and a first response terminal. The first input terminal is connected to the auxiliary power source of the charger, the first control terminal is connected to the second control terminal, the first trigger terminal is connected to the first output terminal, and the first response terminal is connected to the fourth access terminal of the DC-DC module. When the auxiliary power input trigger signal of the charger is received, the switching unit is used to control the first input terminal and the first output terminal to be turned on for a period of time and then turned off, so that the trigger signal input to the first trigger terminal is interrupted after a period of time. The first isolation unit is used to control the first reaction terminal to be turned on for a period of time and then turned off according to the received trigger signal, so that the fourth access terminal of the DC-DC module receives a low level signal for a period of time and then resumes receiving a high level signal.

3. The battery management system capable of repeated hibernation according to claim 2, characterized in that, The first switching unit includes a first capacitor, a first resistor, and a PMOS transistor. The switching unit includes a PNP transistor and a second capacitor. The first isolation unit includes a first optocoupler. The first terminals of the first capacitor and the first resistor, as well as the second terminal of the PMOS transistor, are connected to the auxiliary power supply of the charger. The second terminals of the first capacitor and the first resistor, as well as the first terminal of the PMOS transistor, are connected to the first and second terminals of the PNP transistor and the first terminal of the second capacitor. The third terminal of the PNP transistor and the second terminal of the second capacitor are connected to ground. The third terminal of the PMOS transistor is connected to the first terminal of the first optocoupler. The fourth terminal of the first optocoupler is connected to the fourth input terminal of the DC-DC module. The second and third terminals of the first optocoupler are connected to ground.

4. The battery management system capable of repeated hibernation according to claim 1, characterized in that, The second wake-up module includes a second isolation unit, which includes a second trigger terminal and a second response terminal. The second trigger terminal is connected to the auxiliary power source of the charger, and the second response terminal and the third access terminal of the control module are connected to the power source. When the auxiliary power source of the charger inputs a trigger signal, the second isolation unit is used to control the second response terminal to be turned on according to the received trigger signal, so that the third access terminal of the control module receives a low-level signal.

5. The battery management system capable of repeated hibernation according to claim 4, characterized in that, The second isolation unit includes a second optocoupler, the first terminal of the second optocoupler is connected to the auxiliary power supply of the charger, the fourth terminal of the second optocoupler and the third access terminal of the control module are connected to a 3V power supply, and the second and third terminals of the second optocoupler are connected to ground.

6. The battery management system capable of repeated hibernation according to claim 1, characterized in that, The control module includes a controller and a second on / off unit. The second on / off unit is provided with a third input terminal, a third control terminal, and a third output terminal. The controller is connected to the third control terminal and is used to control the third input terminal and the third output terminal to switch between connected and disconnected, so that the fourth access terminal of the DC-DC module switches between continuously receiving a low-level signal and resuming receiving a high-level signal.

7. The battery management system capable of repeated hibernation according to claim 6, characterized in that, The second switching unit includes an NMOS transistor, the first terminal of which is connected to the controller, the second terminal of which is connected to ground, and the third terminal of which is connected to the fourth access terminal.

8. A battery charging system, characterized in that, include: The battery, charger, and battery management system capable of repeated hibernation as described in any one of claims 1 to 7, wherein the battery is provided with a positive terminal and a negative terminal, the charger is provided with a first DC output terminal, a second DC output terminal, an isolated auxiliary power output terminal, and a first DIDO control terminal, and the battery management system further includes a CHG switch and a DSG switch connected in series, and a second DIDO control terminal, wherein the first DC output terminal is electrically connected to the DSG switch, the CHG switch is electrically connected to the positive terminal, the second DC output terminal is electrically connected to the negative terminal, the isolated auxiliary power output terminal is electrically connected to the first access terminal and the second access terminal, and the first DIDO control terminal and the second DIDO control terminal are electrically connected.

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