A battery management system and a battery pack

Abstract

The present invention provides a battery management system and a battery pack, the battery management system comprising: at least two analog front-end chips, the analog front-end chips are used to collect the output voltage, output current or operating temperature of the battery; and a control unit, the control unit controls the power on and off of the analog front-end chips; when any analog front-end chip is awakened by an external interference signal, the analog front-end chip directly or indirectly supplies power to the control unit to enable the control unit to work, and at this time the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip. Compared with the prior art, the battery management system can send a power-off signal to the analog front-end chip awakened by the external interference signal in time, so that the analog front-end chip awakened by the external interference signal can be powered off normally, avoiding the problem of over-discharge of the battery cell due to the inability to power off the analog front-end chip awakened by the external interference signal.

Description

Technical Field

[0001] The invention relates to a battery management system and a battery pack having the battery management system. Background Art

[0002] With the progress of society, portable power tools are more and more widely used in our lives, and the battery technology as their power source is also developing continuously. Considering environmental protection and repeated use, the demand for secondary batteries is growing, and lithium batteries have become the ideal battery for portable power tools due to their unique advantages, such as high energy density, long service life, high discharge voltage and no memory effect. In order to meet the voltage and capacity requirements of portable power tools, lithium battery packs can be used for power supply.

[0003] In order to extend the service life of lithium battery packs and improve the reliability of lithium battery packs, it is necessary to manage the batteries using a battery management system (BMS). The battery management system usually uses an analog front-end chip (AFE) to sample the battery to obtain information such as the output voltage, output current, and operating temperature of the battery. When there are many battery strings, multiple analog front-end chips are usually cascaded to complete the sampling of multiple strings of batteries. The analog front-end chip is powered on by waking up through the TS pin hardware signal, and its power-off is completed by the control unit (MCU) sending a power-off instruction through the I2C chip. When the battery is in an environment with severe interference, the high-string analog front-end chip may be abnormally awakened, and the control unit is in an inoperative state at this time, so that the analog front-end chip cannot be powered off, which in turn causes the high-string battery to have an over-discharge problem, and even causes the entire battery pack to be scrapped.

[0004] In view of the above problems, it is necessary to provide a new battery management system to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a battery management system, which can promptly send a power-off signal to an analog front-end chip awakened by an external interference signal, so that the analog front-end chip awakened by the external interference signal can be powered off normally, avoiding the problem of over-discharge of the battery cell due to the inability to power off the analog front-end chip awakened by the external interference signal.

[0006] To achieve the above-mentioned objectives, the present invention provides a battery management system, comprising: at least two analog front-end chips, which are used to collect the output voltage, output current or operating temperature of the battery; and a control unit, which controls the power-on and power-off of the analog front-end chips; when any analog front-end chip is awakened by an external interference signal, the analog front-end chip directly or indirectly supplies power to the control unit to enable the control unit to work, and at this time the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip.

[0007] As a further improvement of the present invention, the at least two analog front-end chips include a primary analog front-end chip and at least one advanced analog front-end chip; when the advanced analog front-end chip is awakened by an external interference signal, the advanced analog front-end chip directly or indirectly sends a wake-up signal to the primary analog front-end chip to wake up the primary analog front-end chip, and then the primary analog front-end chip powers the control unit to make the control unit work; at this time, the control unit sends a power-off signal to the primary analog front-end chip and the advanced analog front-end chip to power off the primary analog front-end chip and the advanced analog front-end chip.

[0008] As a further improvement of the present invention, the control unit has a communication pin; the analog front-end chip has a TS pin connected to the communication pin; the control unit sends a wake-up signal to the TS pin through the communication pin, thereby waking up the analog front-end chip.

[0009] As a further improvement of the present invention, the battery management system includes a coupling wake-up circuit, the analog front-end chip has a 3V3 pin and a TS pin, and the control unit has a VCC pin; the 3V3 pin of the primary analog front-end chip is connected to the VCC pin of the control unit, and the 3V3 pin of the advanced analog front-end chip is connected to the TS pin of the primary analog front-end chip through the coupling wake-up circuit.

[0010] As a further improvement of the present invention, the analog front-end chip also includes a GND pin, and the coupling wake-up circuit includes a first resistor, a second resistor, a first capacitor and a second capacitor; the two ends of the first resistor are respectively connected to the 3V3 pin and the GND pin of the advanced analog front-end chip; the two ends of the second resistor are respectively connected to the TS pin and the GND pin of the primary analog front-end chip; the two ends of the first capacitor are respectively connected to the TS pin of the primary analog front-end chip and the 3V3 pin of the advanced analog front-end chip; the two ends of the second capacitor are respectively connected to the GND pin of the primary analog front-end chip and the GND pin of the advanced analog front-end chip.

[0011] As a further improvement of the present invention, the battery management system also includes an LDO chip that supplies power to the control unit; when any analog front-end chip is awakened by an external interference signal, the analog front-end chip sends a wake-up signal to the LDO chip so that the LDO chip supplies power to the control unit, thereby enabling the control unit to work; at this time, the control unit sends a power-off signal to the analog front-end chip so that the analog front-end chip is powered off.

[0012] As a further improvement of the present invention, the control unit has a communication pin and an EN pin, and the LDO chip has an EN pin; the communication pin is connected to the EN pin of the LDO chip; the EN pin of the control unit is connected to the TS pin of the analog front-end chip.

[0013] As a further improvement of the present invention, the 3V3 pin of the analog front-end chip is connected to the EN pin of the LDO chip through a coupling wake-up circuit.

[0014] As a further improvement of the present invention, the coupling wake-up circuit includes a third resistor, a fourth resistor, a third capacitor and a fourth capacitor; the two ends of the third resistor are respectively connected to the 3V3 pin and the GND pin of an analog front-end chip; the two ends of the fourth resistor are respectively connected to the EN pin of the LDO chip and the GND pin of another analog front-end chip; one end of the third capacitor is connected to one end of the third resistor close to the 3V3 pin, and the other end is connected to the EN pin of the LDO; one end of the fourth capacitor is connected to one end of the third resistor close to the GND pin, and the other end is connected to the GND pin of the LDO; the 3V3 pins of the remaining analog front-end chips are connected to the EN pin of the LDO chip.

[0015] As a further improvement of the present invention, a diode is further provided between the 3V3 pins of the other analog front-end chips and the EN pin of the LDO chip, so that the current can only flow into the EN pin of the LDO chip.

[0016] As a further improvement of the present invention, before the control unit sends a power-off signal, the control unit detects whether a peripheral device is connected to a battery; if not, the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip.

[0017] As a further improvement of the present invention, if no peripheral device is connected to the battery, the control unit waits for a preset time and then sends a power-off signal to the analog front-end chip.

[0018] The present invention also discloses a battery pack, comprising a plurality of batteries and the aforementioned battery management system.

[0019] The beneficial effect of the present invention is that the battery management system of the present invention can promptly send a power-off signal to the analog front-end chip awakened by the external interference signal, so that the analog front-end chip awakened by the external interference signal can be powered off normally, avoiding the problem of over-discharge of the battery cell due to the inability to power off the analog front-end chip awakened by the external interference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a battery management system module according to the first embodiment of the present invention.

[0021] Figure 2 FIG. 4 is a schematic diagram of the structure of the coupling wake-up circuit of the first embodiment.

[0022] Figure 3 Schematic diagram of a battery management system module according to a second embodiment of the present invention.

[0023] Figure 4 It is a module diagram of a battery management system according to a third embodiment of the present invention.

[0024] Figure 5 4 is a schematic diagram of the structure of the coupling wake-up circuit of the third embodiment.

[0025] Figure 6 FIG. 4 is a schematic diagram of modules of a battery management system according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention discloses a battery management system, comprising at least two analog front-end chips (AFE) and a control unit. The analog front-end chip is used to collect the output voltage, output current or operating temperature of the battery. The battery can be a single cell or a cell string formed by multiple cells connected in series or in parallel. The control unit is used to control the power-on and power-off of the analog front-end chip. When any of the analog front-end chips is awakened by an external interference signal, the analog front-end chip directly or indirectly supplies power to the control unit to enable the control unit to work. At this time, the control unit detects whether there is a peripheral device connected to the battery. If not, the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip, thereby avoiding the problem of over-discharge of the battery due to the inability to power off the analog front-end chip awakened by the external interference signal. Preferably, if no peripheral device is connected to the battery, the control unit waits for a preset time before sending a power-off signal to the analog front-end chip. The following is a detailed description in conjunction with specific embodiments.

[0028] See also Figure 1 as well as Figure 2 As shown, the present invention discloses a battery management system 100 for monitoring the output voltage, output current or operating temperature of a battery 70. The battery 70 includes a first battery 71 and a second battery 72. The battery management system 100 includes an analog front-end chip 110, a wake-up circuit 120 for waking up the analog front-end chip 110, a control unit 130, an I2C unit 140, a coupling wake-up circuit 150 and an output component 160. Please refer to Figure 1 As shown, the analog front-end chip 110 is used to detect the output voltage, output current or operating temperature of the battery 70. Each analog front-end chip 110 includes a TS pin, an SDA pin, an SCL pin and a 3V3 pin. The analog front-end chip 110 includes a primary analog front-end chip 111 and at least one advanced analog front-end chip 112. The primary analog front-end chip 111 is used to detect the first battery 71, and the advanced analog front-end chip 112 is used to detect the second battery 72. In this embodiment, the number of the advanced analog front-end chips 112 is 1, but in other embodiments, the number of the advanced analog front-end chips 112 can be set according to the number of the batteries 70. The wake-up circuit 120 includes a primary wake-up circuit 121 that cooperates with the primary analog front-end chip 111 and an advanced wake-up circuit 122 that cooperates with the advanced analog front-end chip 112. The primary wake-up circuit 121 and the advanced wake-up circuit 122 both have a signal output pin and an EN pin. The signal output pin of the primary wake-up circuit 121 is connected to the TS pin of the primary analog front-end chip 111, and its EN pin is connected to the 3V3 pin of the advanced analog front-end chip 112 through the coupling wake-up circuit 150. The signal output pin of the advanced wake-up circuit 122 is connected to the TS pin of the advanced analog front-end chip 112, and its EN pin is connected to the EN pin of the primary wake-up circuit 121. In this embodiment, the control unit 130 is a micro control unit (MCU). The micro control unit 130 is connected to the SDA pin and the SCL pin of the primary analog front-end chip 111 to communicate with the primary analog front-end chip 111. The micro control unit 130 is also connected to the SDA pin and the SCL pin of the advanced analog front-end chip 112 through the I2C unit 140 to communicate with the advanced analog front-end chip 112. The 3V3 pin of the primary analog front-end chip 111 is connected to the VCC pin of the micro control unit 130 to power the micro control unit 130. One end of the coupled wake-up circuit 150 is connected to the EN pin of the primary wake-up circuit 121, and the other end is connected to the 3V3 pin of the advanced analog front-end chip 112. Figure 2As shown, the coupling wake-up circuit 150 includes a first resistor 151, a second resistor 152, a first capacitor 153 and a second capacitor 154. The two ends of the first resistor 151 are respectively connected to the 3V3 pin and the GND pin of the advanced analog front-end chip 112, and the two ends of the second resistor 152 are respectively connected to the TS pin and the GND pin of the primary analog front-end chip 111. In this embodiment, one end of the second resistor 152 is connected to the EN pin of the primary wake-up circuit 121, and thus connected to the TS pin of the primary analog front-end chip 111 through the primary wake-up circuit 121. The two ends of the first capacitor 153 are respectively connected to the TS pin of the primary analog front-end chip 111 and the 3V3 pin of the advanced analog front-end chip 112, and the two ends of the second capacitor 154 are respectively connected to the GND pin of the primary analog front-end chip 111 and the GND pin of the advanced analog front-end chip 112. Please refer to Figure 1 As shown, the output component 160 includes a first positive terminal 161, a first negative terminal 162, a second positive terminal 163, a second negative terminal 164 and a communication terminal 165. The first positive terminal 161 and the first negative terminal 162 are connected to the two ends of the first battery 71, and the second positive terminal 163 and the second negative terminal 164 are connected to the two ends of the second battery 72, so that the electric energy of the first battery 71 and the second battery 72 is output through the first positive terminal 161, the first negative terminal 162, the second positive terminal 163, and the second negative terminal 164. The communication terminal 165 is connected to the COM communication pin of the micro control unit 130. Preferably, the EN pin of the primary wake-up circuit 121 is connected to the KEY terminal through the first diode D1, and is connected to the COM communication pin of the micro control unit 130 through the second diode D2. Such a configuration makes it easy for the microcontroller unit 130 to directly wake up the primary analog front-end chip 111 and the advanced analog front-end chip 112 through the COM communication pin, or for the user to directly wake up the primary analog front-end chip 111 and the advanced analog front-end chip 112 through KEY.

[0029] See also Figure 1As shown, when the microcontroller unit 130 is not working and the primary analog front-end chip 111 is awakened by an external interference signal, the 3V3 pin of the primary analog front-end chip 111 supplies power to the microcontroller unit 130, so that the microcontroller unit 130 can work normally. At this time, the microcontroller unit 130 detects whether there is a peripheral device connected to the input component 160. If not, the microcontroller unit 130 sends a power-off signal to the primary analog front-end chip 111 to power off the primary analog front-end chip 111, and then the microcontroller unit 130 is powered off. In this case, the primary analog front-end chip 111 directly supplies power to the microcontroller unit 130. Preferably, if no peripheral device is connected to the input component 60, the microcontroller unit 30 waits for a preset time before sending a power-off signal to the primary analog front-end chip 111. The preset time can be set by the user as needed.

[0030] When the microcontroller unit 130 is not working and the advanced analog front-end chip 112 is awakened by an external interference signal, the 3V3 pin of the advanced analog front-end chip 112 sends a wake-up signal to the TS pin of the primary analog front-end chip 111 through the coupling wake-up circuit 150, thereby waking up the primary analog front-end chip 111. At this time, the 3V3 pin of the primary analog front-end chip 111 supplies power to the microcontroller unit 130, so that the microcontroller unit 130 works normally. At this time, the microcontroller unit 130 detects whether there is a peripheral connected to the input component 160. If not, the microcontroller unit 130 directly sends a power-off signal to the primary analog front-end chip 111, and sends a power-off signal to the advanced analog front-end chip 112 through the I2C unit 140, and then the microcontroller unit 130 is powered off. In this case, the advanced analog front-end chip 112 indirectly supplies power to the microcontroller unit 130. Preferably, if no peripheral is connected to the input component 160, the microcontroller unit 130 waits for a preset time before sending a power-off signal to the primary analog front-end chip 111 and the advanced analog front-end chip 112. In this embodiment, the advanced analog front-end chip 112 directly sends a wake-up signal to the primary analog front-end chip 111. However, in other embodiments, the advanced analog front-end chip 112 may also indirectly send a wake-up signal to the primary analog front-end chip 111. For example, the advanced analog front-end chip 112 sends a wake-up signal to the third analog front-end chip, and then sends a wake-up signal to the primary analog front-end chip 111 through the third analog front-end chip, thereby indirectly waking up the primary analog front-end chip 111.

[0031] In this embodiment, the two ends of the first battery 71 are respectively connected to the first positive terminal 161 and the first negative terminal 162, and the two ends of the second battery 72 are respectively connected to the second positive terminal 163 and the second negative terminal 164, so that the user can cooperate with the output component 160 through different docking terminal groups to make the battery 70 output a series voltage or a parallel voltage. However, in other embodiments, the battery 70 can also be directly configured to output a series voltage. Figure 3 The battery management system 200 of the second embodiment is shown. The structure of the battery management system 200 is substantially the same as that of the battery management system 100, except that the positive electrode of the first battery 71 is directly connected to the negative electrode of the second battery 72, so that the batteries 70 output a series voltage.

[0032] Compared with the prior art, the battery management system 100 of the present invention can promptly send a power-off signal to the analog front-end chip 110 awakened by the external interference signal, so that the analog front-end chip 110 awakened by the external interference signal can be powered off normally, thereby avoiding the problem of over-discharge of the battery cell due to the inability to power off the analog front-end chip 110 awakened by the external interference signal.

[0033] Figure 4 The battery management system 300 of the third embodiment of the present invention is shown. The battery management system 300 includes an analog front-end chip 310, a wake-up circuit 320 for waking up the analog front-end chip 310, a control unit 330, an I2C unit 340, a coupling wake-up circuit 350, an LDO chip 360 for powering the control unit 330, and an output component 370. Figure 4As shown, the analog front-end chip 310 is used to detect the output voltage, output current or operating temperature of the battery 70. Each analog front-end chip 310 includes a TS pin, an SDA pin, an SCL pin and a 3V3 pin. The analog front-end chip 310 includes a first analog front-end chip 311 and a second analog front-end chip 312. The first analog front-end chip 311 is used to detect the first battery 71, and the second analog front-end chip 312 is used to detect the second battery 72. In this embodiment, the number of the analog front-end chips 310 is 2, but in other embodiments, the number of the analog front-end chips 310 can be set according to the number of the batteries 70. The wake-up circuit 320 includes a first wake-up circuit 321 that cooperates with the first analog front-end chip 311 and a second wake-up circuit 322 that cooperates with the second analog front-end chip 312. The first wake-up circuit 321 and the second wake-up circuit 322 both have a signal output pin and an EN pin. The signal output pin of the first wake-up circuit 321 is connected to the TS pin of the first analog front-end chip 311, and the signal output pin of the second wake-up circuit 322 is connected to the TS pin of the second analog front-end chip 312. The EN pins of the first wake-up circuit 321 and the second wake-up circuit 322 are connected to the EN pin of the control unit 330 so that the control unit 330 can wake up the first analog front-end chip 311 and the second analog front-end chip 312. In this embodiment, the control unit 330 is a micro control unit (MCU). The control unit 330 is connected to the SDA pin and the SCL pin of the first analog front-end chip 311 so as to communicate with the first analog front-end chip 311. The control unit 330 is also connected to the SDA pin and the SCL pin of the second analog front-end chip 312 through the I2C unit 340 so as to communicate with the second analog front-end chip 312. The coupling wake-up circuit 350 includes a signal input terminal and a signal output terminal. The 3V3 pins of the first analog front-end chip 311 and the second analog front-end chip 312 are connected to the signal input end of the coupling wake-up circuit 350, and the signal output end of the coupling wake-up circuit 350 is connected to the LDO chip 360. The LDO chip 360 is used to power the control unit 330. The LDO chip 360 includes a BAT pin, an EN pin, and a 3V3 pin. The BAT pin of the LDO chip 360 is connected to the power supply, the EN pin is connected to the signal output end of the coupling wake-up circuit 350, and the 3V3 pin is connected to the VCC pin of the control unit 330. The output component 370 includes a positive terminal 371, a negative terminal 372, and a communication terminal 373.The positive terminal 371 is connected to the positive electrode of the second battery 72 , the negative electrode of the second battery 72 is connected to the positive electrode of the first battery 71 , the negative electrode of the first battery 71 is connected to the negative terminal 372 , and the communication terminal 373 is connected to the COM communication pin of the control unit 330 .

[0034] See also Figure 5 As shown, the coupling wake-up circuit 350 includes a third resistor 351, a fourth resistor 352, a third capacitor 353 and a fourth capacitor 354. The two ends of the third resistor 351 are respectively connected to the 3V3 pin and the GND pin of the second analog front-end chip 312; one end of the fourth resistor 352 is connected to the GND pin of the first analog front-end chip 311, and the other end is connected to the EN pin of the LDO chip 360. The two ends of the third capacitor 353 are respectively connected to the 3V3 pin of the second analog front-end chip 312 and the EN pin of the LDO chip 360; the two ends of the fourth capacitor 354 are respectively connected to the GND pin of the first analog front-end chip 311 and the GND pin of the second analog front-end chip 312. The 3V3 pin of the first analog front-end chip 311 is connected to the EN pin of the LDO chip 360. Preferably, the first analog front-end chip 311 is connected to the EN pin of the LDO chip 360 through the sixth diode D6, so that the current can only flow into the EN pin of the LDO chip 360.

[0035] Preferably, the EN pin of the LDO chip is connected to the COM communication pin of the control unit 330 through a fourth diode D4, so that the control unit 330 wakes up the LDO chip 360. The EN pin of the LDO chip 360 is also connected to KEY through a fifth diode D5, so that the user can directly wake up the LDO chip 360 through KEY.

[0036] See also Figure 4 As shown, when the control unit 330 is not working and any one of the analog front-end chips 310 is awakened by an external interference signal, the 3V3 pin of the analog front-end chip 310 sends a signal to the coupling wake-up circuit 350, thereby waking up the LDO chip 360. At this time, the LDO chip 360 supplies power to the control unit 330, so that the control unit 330 works normally. Then, the control unit 330 detects whether there is an external device connected to the battery 70. If not, the control unit 330 sends a power-off signal to the analog front-end chip 310 to power off the analog front-end chip 310.

[0037] In this embodiment, the first battery 71 and the second battery 72 are directly connected in series, so that only a series voltage can be output. However, in other embodiments, the first battery 71 and the second battery 72 can also be configured to output a parallel voltage. Figure 6 The fourth embodiment of the present invention is shown as a battery management system 400, which has a structure similar to the battery management system 300, except that the first battery 71 and the second battery 72 are independent of each other. The first battery 71 outputs power through the first terminal 461 and the second terminal 462, and the second battery 72 outputs power through the third terminal 463 and the fourth terminal 464. This arrangement makes it easy for users to match the first terminal 461, the second terminal 462, the third terminal 463, and the fourth terminal 464 through different docking terminals, so that the battery 70 outputs a series voltage or a parallel voltage.

[0038] The present invention further discloses a battery pack, including a battery 70 and a battery management system 100 / 200 / 300 / 400 for monitoring the battery 70 .

[0039] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A battery management system, It is characterized in that include: At least two analog front-end chips, the analog front-end chips are used to collect the output voltage, output current or operating temperature of the battery; as well as A control unit, the control unit controls powering on and powering off the analog front-end chip; When any analog front-end chip is awakened by an external interference signal, the analog front-end chip directly or indirectly supplies power to the control unit to enable the control unit to operate. At this time, the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip; The at least two analog front-end chips include a primary analog front-end chip and at least one advanced analog front-end chip; when the advanced analog front-end chip is awakened by an external interference signal, the advanced analog front-end chip directly or indirectly sends a wake-up signal to the primary analog front-end chip to wake up the primary analog front-end chip, and then the primary analog front-end chip supplies power to the control unit to enable the control unit to work; at this time, the control unit sends a power-off signal to the primary analog front-end chip and the advanced analog front-end chip to power off the primary analog front-end chip and the advanced analog front-end chip; The battery includes a first battery and a second battery. The primary analog front-end chip is used to detect the first battery, and the advanced analog front-end chip is used to detect the second battery.

2. The battery management system according to claim 1, Features: The control unit has a communication pin; the analog front-end chip has a TS pin connected to the communication pin; the control unit sends a wake-up signal to the TS pin through the communication pin, thereby waking up the analog front-end chip.

3. The battery management system according to claim 1, Features: The battery management system includes a coupling wake-up circuit, the analog front-end chip has a 3V3 pin and a TS pin, and the control unit has a VCC pin; the 3V3 pin of the primary analog front-end chip is connected to the VCC pin of the control unit, and the 3V3 pin of the advanced analog front-end chip is connected to the TS pin of the primary analog front-end chip through the coupling wake-up circuit.

4. The battery management system according to claim 3, Features: The analog front-end chip also includes a GND pin, and the coupling wake-up circuit includes a first resistor, a second resistor, a first capacitor and a second capacitor; the two ends of the first resistor are respectively connected to the 3V3 pin and the GND pin of the advanced analog front-end chip; the two ends of the second resistor are respectively connected to the TS pin and the GND pin of the primary analog front-end chip; the two ends of the first capacitor are respectively connected to the TS pin of the primary analog front-end chip and the 3V3 pin of the advanced analog front-end chip; the two ends of the second capacitor are respectively connected to the GND pin of the primary analog front-end chip and the GND pin of the advanced analog front-end chip.

5. The battery management system according to claim 1, Features: The battery management system also includes an LDO chip that supplies power to the control unit; when any analog front-end chip is awakened by an external interference signal, the analog front-end chip sends a wake-up signal to the LDO chip so that the LDO chip supplies power to the control unit, thereby enabling the control unit to operate; at this time, the control unit sends a power-off signal to the analog front-end chip so that the analog front-end chip is powered off.

6. The battery management system according to claim 5, Features: The control unit has a communication pin and an EN pin, and the LDO chip has an EN pin; the communication pin is connected to the EN pin of the LDO chip; the EN pin of the control unit is connected to the TS pin of the analog front-end chip.

7. The battery management system according to claim 5, Features: The 3V3 pin of the analog front-end chip is connected to the EN pin of the LDO chip through a coupling wake-up circuit.

8. The battery management system according to claim 7, Features: The coupling wake-up circuit includes a third resistor, a fourth resistor, a third capacitor and a fourth capacitor; the two ends of the third resistor are respectively connected to the 3V3 pin and the GND pin of an analog front-end chip; the two ends of the fourth resistor are respectively connected to the EN pin of the LDO chip and the GND pin of another analog front-end chip; one end of the third capacitor is connected to one end of the third resistor close to the 3V3 pin, and the other end is connected to the EN pin of the LDO; one end of the fourth capacitor is connected to one end of the third resistor close to the GND pin, and the other end is connected to the GND pin of the LDO; the 3V3 pins of the remaining analog front-end chips are connected to the EN pin of the LDO chip.

9. The battery management system according to claim 8, Features: A diode is also provided between the 3V3 pins of the other analog front-end chips and the EN pin of the LDO chip, so that the current can only flow into the EN pin of the LDO chip.

10. The battery management system according to claim 1, Features: Before the control unit sends a power-off signal, the control unit detects whether a peripheral device is connected to a battery; if not, the control unit sends a power-off signal to the analog front-end chip to power off the analog front-end chip.

11. The battery management system according to claim 10, Features: If no peripheral device is connected to the battery, the control unit waits for a preset time and then sends a power-off signal to the analog front-end chip.

12. A battery pack, It is characterized in that include: Batteries; as well as A battery management system as claimed in any one of claims 1 to 11.

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