Reverse wake-up method of daisy chain, battery management system and device

Abstract

According to the daisy chain reverse wake-up method, the battery management system and the battery management equipment provided by the invention, when the main control unit is in the dormant state, each front-end unit monitors the communication state of the corresponding battery pack and the daisy chain, and if a fault is detected, the battery pack is waken up; if yes, the corresponding front-end unit transmits an alarm signal to the battery management unit along a direction opposite to the communication direction so as to wake up the main control unit; when the main control unit is in a working state, starting from the front-end units connected with the bridging chip, each front-end unit monitors the corresponding battery pack, and when a fault is detected, the corresponding front-end unit sends an alarm signal to the main control unit along a direction opposite to the communication direction, the transmission directions of the alarm signal and the communication data coding signal are opposite, and the main control unit sends the alarm signal to the bridging chip; when the alarm signal and the communication data coding signal are located in the same communication line, the alarm signal and the communication data coding signal are mutually superposed and transmitted; therefore, when the main control unit is in the dormant state and the working state, the main control unit can receive the alarm signal in time.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a daisy chain reverse wake-up method, a battery management system and a device. Background Art

[0002] Daisy chain topology is a layout method that connects multiple devices in a linear order to form a ring or linear structure. Daisy chain topology has the advantages of simple deployment, cost savings, good scalability, support for multiple data types, high bandwidth and low latency. Therefore, daisy chain topology is widely used in the communication field. At present, systems that commonly use daisy chain topology include DDR, battery management system, etc.

[0003] However, during the reverse wake-up process of the daisy chain, when the main control unit is in sleep mode, it cannot receive the alarm signal from the front-end unit, and when the main control unit is in working mode, the front-end units cannot simultaneously transmit the communication data encoding signal and the alarm signal, resulting in a technical problem that the alarm signal cannot be transmitted to the main control unit in a timely manner.

[0004] Therefore, how to enable the main control unit to receive the alarm signal from the front-end unit in time has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The present invention provides a daisy chain reverse wake-up method, a battery management system and a device, which solve the technical problem that a main control unit is difficult to obtain an alarm signal of a front-end unit in time.

[0006] According to a first aspect of the present invention, an embodiment of the present invention provides a reverse wake-up method for a daisy chain, the method comprising: a main control unit, a battery management unit, a bridge chip, N front-end units and N battery packs, the first end and the second end of the battery management unit are respectively coupled to the first end of the main control unit and the first end of the bridge chip, the second end of the main control unit is coupled to the second end of the bridge chip, the third end of the bridge chip is coupled to the input ends of the N front-end units, each front-end unit is correspondingly coupled to a battery pack, and the front-end units are connected through communication connection lines to form a daisy chain, wherein N is an integer greater than 1;

[0007] The method comprises:

[0008] When the main control unit is in a dormant state, the following steps are performed:

[0009] Controlling each front-end unit to monitor the corresponding battery pack; and

[0010] The unit periodically sends a heartbeat signal to a previous front-end unit along the communication direction of the daisy chain;

[0011] Monitoring the heartbeat signal sent by the next front-end unit within a preset time;

[0012] The working state of the daisy chain is determined according to the monitoring situation, wherein if a battery pack failure or a communication failure between the front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit;

[0013] When the main control unit is in working state, the following steps are performed:

[0014] Starting from the front-end unit connected to the bridge chip, control N front-end units to sequentially receive communication data coded signals along the communication direction, and the communication data coded signal received by the i-th front-end unit along the communication direction includes data information of the 1st front-end unit to the i-1th front-end unit; wherein N≥i>1; and

[0015] Fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

[0016] Optionally, the method further includes: when the main control unit is in a working state, controlling the main control unit to send an access signal to the bridge chip to access the data of the N front-end units.

[0017] Optionally, when the main control unit is in working state, the control bridge chip converts the access signal into the communication data encoding signal when receiving the access signal and sends it to the front-end unit connected to the bridge chip.

[0018] Optionally, the communication data encoding signal and the alarm signal have different frequencies.

[0019] According to a second aspect of the present invention, an embodiment of the present invention provides a battery management system, including:

[0020] A main control unit, a battery management unit, a bridge chip, N front-end units and N battery packs, wherein the first end and the second end of the battery management unit are respectively coupled to the first end of the main control unit and the first end of the bridge chip, the second end of the main control unit is coupled to the second end of the bridge chip, and the third end of the bridge chip is coupled to the input ends of the N front-end units, each front-end unit is correspondingly coupled to a battery pack, and the front-end units are connected through communication connection lines to form a daisy chain, wherein N is an integer greater than 1;

[0021] The front-end unit is used to monitor the corresponding battery pack when the main control unit is in a dormant state;

[0022] Periodically sending a heartbeat signal to a previous front-end unit along the communication direction of the daisy chain;

[0023] Monitoring the heartbeat signal sent by the next front-end unit within a preset time;

[0024] Determining the working state of the daisy chain according to the monitoring situation, wherein, if a battery pack failure or a communication failure between front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; and

[0025] When the main control unit is in working state, starting from the front-end unit connected to the bridge chip, the communication data encoding signal is received in sequence along the communication direction, wherein the communication data encoding signal received by the i-th front-end unit along the communication direction includes data information of the 1st front-end unit to the i-1th front-end unit; wherein N≥i>1;

[0026] Fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

[0027] Optionally, when the main control unit is in a working state, the main control unit is further used to send an access signal to the N front-end units for accessing data of the N front-end units.

[0028] Optionally, the main control unit sends an access signal to the N front-end units through the bridge chip;

[0029] The bridge chip is also used for converting the access signal into the communication data encoding signal when receiving the access signal, and sending the communication data encoding signal to the front-end unit connected to the bridge chip.

[0030] Optionally, the front-end unit includes a high-frequency signal driving subunit and a low-frequency signal driving subunit; wherein the frequencies of the communication data encoding signal and the alarm signal are different;

[0031] The high-frequency signal driving subunit is used to transmit the communication data encoding signal and the alarm signal;

[0032] The low-frequency signal driving subunit is used to transmit the communication data encoding signal and the alarm signal.

[0033] Optionally, the bridge chip is connected to one end of the N front-end units.

[0034] Optionally, the bridge chip is connected end to end with the Nth front-end unit to form a daisy chain ring network.

[0035] According to a third aspect of the present invention, an embodiment of the present invention provides a device, including a battery management system provided by any one of the second aspects of the present invention.

[0036] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0037] The battery management system and device provided by the present invention adopt the above-mentioned reverse wake-up method of the daisy chain. When the main control unit is in a dormant state, each front-end unit monitors the corresponding battery pack and the communication status of the daisy chain. If a fault is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; when the main control unit is in a working state: starting from the front-end unit connected to the bridge chip, each front-end unit monitors the corresponding battery pack, and when a fault is detected, the corresponding front-end unit sends an alarm signal to the main control unit in the opposite direction of the communication direction, and when the alarm signal and the communication data encoding signal are on the same communication line, the alarm signal and the communication data encoding signal are superimposed and transmitted on each other; thereby, the main control unit can receive the alarm signal in time when it is in a dormant state and a working state, and the main control unit does not need to access the front-end unit all the time, thereby avoiding the problem of excessive load on the main control unit.

[0038] Furthermore, the present invention transmits the communication data encoding signal and the alarm signal in opposite directions at different frequencies, thereby achieving simultaneous transmission of the communication data encoding signal and the alarm signal without interfering with each other in daisy chain communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a schematic flow chart of a reverse wake-up method of a daisy chain in an embodiment of the present invention;

[0041] Figure 2is a schematic diagram of the structure of a battery management system in one embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of the structure of a battery management system in another embodiment of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the front end unit in one embodiment of the present invention;

[0044] Figure 5 It is a waveform diagram of the superposition of the communication data coding signal and the alarm signal in one embodiment of the present invention. Description of the drawings:

[0046] MCU-main control unit;

[0047] BRIDGE-bridge chip;

[0048] PMIC-Power Management Unit;

[0049] 11- front end unit;

[0050] 21-battery pack;

[0051] 111-high frequency signal driving subunit;

[0052] 112-Low frequency signal driving subunit. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0056] In view of the technical problem in the prior art that the main control unit cannot receive the alarm signal in time during the reverse wake-up process of the daisy chain, the present invention provides a reverse wake-up method for a daisy chain, when the main control unit is in a dormant state, each front-end unit monitors the corresponding battery pack and the communication status of the daisy chain, if a fault is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the reverse direction of the communication direction to wake up the main control unit; when the main control unit is in a working state: starting from the front-end unit connected to the bridge chip, each front-end unit monitors the corresponding battery pack, and when a fault is detected, the corresponding front-end unit sends an alarm signal to the main control unit in the reverse direction of the communication direction, when the alarm signal and the communication data encoding signal are on the same communication line, the alarm signal and the communication data encoding signal are superimposed and transmitted on each other, so that the main control unit can receive the alarm signal in time in both the dormant state and the working state, and the main control unit does not need to access the front-end unit all the time, thereby avoiding the problem of excessive load on the main control unit.

[0057] Specifically, the embodiment of the present invention includes: a main control unit, a battery management unit, a bridge chip, N front-end units and N battery packs, the first end and the second end of the battery management unit are respectively coupled to the first end of the main control unit and the first end of the bridge chip, the second end of the main control unit is coupled to the second end of the bridge chip, the third end of the bridge chip is coupled to the input end of the N front-end units, each front-end unit is correspondingly coupled to a battery pack, and the front-end units are connected through communication connection lines to form a daisy chain, wherein N is an integer greater than 1;

[0058] The method comprises:

[0059] When the main control unit is in a dormant state, the following steps are performed:

[0060] Controlling each front-end unit to monitor the corresponding battery pack; and

[0061] Periodically sending a heartbeat signal to a previous front-end unit along the communication direction of the daisy chain;

[0062] Monitoring the heartbeat signal sent by the next front-end unit within a preset time;

[0063] The working state of the daisy chain is determined according to the monitoring situation, wherein if a battery pack failure or a communication failure between the front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit;

[0064] When the main control unit is in working state, the following steps are performed:

[0065] Starting from the front-end unit connected to the bridge chip, control N front-end units to sequentially receive communication data coded signals along the communication direction, and the communication data coded signal received by the i-th front-end unit along the communication direction includes data information of the 1st front-end unit to the i-1th front-end unit; wherein N≥i>1; and

[0066] Fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

[0067] In a specific implementation, please refer to Figure 1 , a daisy chain reverse wake-up method provided by an embodiment of the present invention includes:

[0068] S11: Obtain the state of the main control unit; if the main control unit is in a dormant state, enter S12; if the main control unit is in a working state, enter S14;

[0069] S12: Control each front-end unit to monitor the corresponding battery pack, and periodically send a heartbeat signal to the previous front-end unit along the communication direction of the daisy chain, and monitor the heartbeat signal sent by the next front-end unit within a preset time;

[0070] S13: judging the working state of the daisy chain according to the monitoring situation, wherein, if a battery pack failure or a communication failure between the front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit;

[0071] S14: Starting from the front-end unit connected to the bridge chip, control N front-end units to receive communication data coding signals in sequence along the communication direction, and the communication data coding signal received by the i-th front-end unit along the communication direction includes data information from the 1st front-end unit to the i-1th front-end unit; wherein, N≥i>1, and fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

[0072] In one implementation, the method for obtaining the status of the main control unit includes:

[0073] Based on the signal transmitted in the front-end unit, the state of the main control unit is obtained.

[0074] It can be seen that the main control unit can receive the alarm signal in time when it is in the sleep state and the working state, and the main control unit does not need to access the front-end unit all the time, thus avoiding the problem of excessive load on the main control unit.

[0075] In a specific implementation, when the main control unit is in a working state, a daisy chain reverse wake-up method provided by an embodiment of the present invention further includes:

[0076] The main control unit is controlled to send an access signal to the bridge chip to access the data of the N front-end units.

[0077] In this case, the reverse wake-up method of the daisy chain provided by the embodiment of the present invention further includes:

[0078] When the main control unit is in working state, the control bridge chip converts the access signal into the communication data encoding signal upon receiving the access signal and sends it to the front-end unit connected to the bridge chip.

[0079] In a preferred implementation, in order to prevent the communication data encoding signal and the alarm signal from interfering with each other, the communication data encoding signal and the alarm signal have different frequencies.

[0080] Among them, since the communication data encoding signal and the alarm signal are transmitted at two different frequencies respectively, the communication data encoding signal and the alarm signal will not interfere with each other.

[0081] Among them, as an example, the communication data coding signal and the alarm signal are respectively a high-frequency signal and a low-frequency signal. Of course, it should be understood that the communication data coding signal and the alarm signal can also be respectively a low-frequency signal and a high-frequency signal, as long as the frequencies of the communication data coding signal and the alarm signal are different.

[0082] It can be seen that the reverse wake-up method of the daisy chain provided by the present invention is that when the main control unit is in a dormant state, each front-end unit monitors the corresponding battery pack and the communication status of the daisy chain. If a fault is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; when the main control unit is in a working state: starting from the front-end unit connected to the bridge chip, each front-end unit monitors the corresponding battery pack, and when a fault is detected, the corresponding front-end unit sends an alarm signal to the main control unit in the opposite direction of the communication direction. The transmission directions of the alarm signal and the communication data coding signal are opposite. When the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed and transmitted on each other; thereby, the main control unit can receive the alarm signal in time when it is in a dormant state and a working state.

[0083] In addition, please refer to Figure 2 The present invention also provides a battery management system that runs the battery management system provided by the embodiment of the present invention. Figure 1 The reverse wake-up method of the daisy chain shown includes: a main control unit MCU, a battery management unit PMIC, a bridge chip BRIDGE, N front-end units 11 and N battery packs 21, the first end and the second end of the battery management unit PMIC are respectively coupled to the first end of the main control unit MCU and the first end of the bridge chip BRIDGE, the second end of the main control unit MCU is coupled to the second end of the bridge chip BRIDGE, the third end of the bridge chip BRIDGE is coupled to the input end of the N front-end units 11, each front-end unit 11 is correspondingly coupled to a battery pack 21, and the front-end units 11 are connected by communication connection lines to form a daisy chain, wherein N is an integer greater than 1;

[0084] The front-end unit 11 is used to monitor the corresponding battery pack 21 when the main control unit MCU is in a dormant state;

[0085] Periodically sending a heartbeat signal to the previous front-end unit 11 along the communication direction of the daisy chain;

[0086] Monitoring the heartbeat signal sent by the next front-end unit 11 within a preset time;

[0087] Determine the working state of the daisy chain according to the monitoring situation, wherein, if a battery pack 21 fault or a communication fault between the front-end units 11 is detected, the corresponding front-end unit 11 transmits an alarm signal to the battery management unit PMIC in the opposite direction of the communication direction to wake up the main control unit MCU; and

[0088] When the main control unit MCU is in working state, starting from the front-end unit 11 connected to the bridge chip BRIDGE, the communication data encoding signal is received in sequence along the communication direction, wherein the communication data encoding signal received by the i-th front-end unit 11 along the communication direction includes data information of the first front-end unit 11 to the i-1-th front-end unit 11; wherein N≥i>1;

[0089] Fault detection is performed on N battery packs 21, and when a fault is detected, the corresponding front-end unit 11 sends the alarm signal to the main control unit MCU in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

[0090] In a specific implementation, please refer to Figure 2 The bridge chip BRIDGE is connected to one end of the N front-end units 11, so that the daisy chain is a single chain.

[0091] In a specific embodiment, Figure 2 As shown, when the main control unit MCU is in working state, the main control unit is also used to send access signals to the N front-end units 11 for accessing data of the N front-end units 11 .

[0092] In a specific implementation, the main control unit MCU sends an access signal to the N front-end units 11 through the bridge chip BRIDGE;

[0093] The bridge chip BRIDGE is also used for converting the access signal into the communication data encoding signal when receiving the access signal, and sending the communication data encoding signal to the front end unit 11 connected to the bridge chip BRIDGE.

[0094] In another embodiment, if Figure 3 As shown, the bridge chip BRIDGE is connected end to end with the Nth front-end unit 11 to form a daisy chain ring network. Figure 3 The rest of the circuit shown is similar to Figure 2 The same, no further elaboration is given here.

[0095] As a preferred embodiment, in order to prevent the communication data encoding signal and the alarm signal from interfering with each other, in an embodiment of the present invention, the communication data encoding signal and the alarm signal have different frequencies.

[0096] In a specific implementation, please refer to Figure 4 , the front end unit 11 includes a high frequency signal driving subunit 111 and a low frequency signal driving subunit 112, wherein:

[0097] The high-frequency signal driving subunit 111 is used to transmit the communication data encoding signal and the alarm signal;

[0098] The low-frequency signal driving subunit 112 is used to transmit the alarm signal and the communication data encoding signal.

[0099] Therefore, the present invention can make the frequencies of the communication data encoding signal and the alarm signal different.

[0100] Among them, as an example, the communication data coding signal and the alarm signal are respectively a high-frequency signal and a low-frequency signal. Of course, it should be understood that the communication data coding signal and the alarm signal can also be respectively a low-frequency signal and a high-frequency signal, as long as the frequencies of the communication data coding signal and the alarm signal are different.

[0101] Since the communication data encoding signal and the alarm signal are transmitted as two signals with different frequencies, the communication data encoding signal and the alarm signal will not interfere with each other.

[0102] Now combined Figure 5 The waveform shown is Figure 4 The working effect of the front-end unit or battery management system shown in the figure is explained. Figure 5 In the example of , the communication data encoding signal is a high-frequency signal, and the alarm signal is a low-frequency signal: wherein:

[0103] The first rose-red line can be understood as the positive end of the high-frequency signal;

[0104] The second green line can be understood as the positive end of the differential signal after the high-frequency signal and the low-frequency signal are superimposed;

[0105] The third blue line can be understood as the negative end of the differential signal after the high-frequency signal and the low-frequency signal are superimposed;

[0106] The fourth orange line can be understood as the negative end of the high-frequency signal;

[0107] The fifth red line can be understood as the differential signal after the positive end of the superimposed differential signal is subtracted from the negative end of the superimposed differential signal;

[0108] It can be seen that at time t1-t2, the fourth red line can be parsed into the third green line and the fourth blue line, and the alarm signal and the communication data coding signal do not interfere with each other.

[0109] In addition, an embodiment of the present invention further provides a device, including the above-mentioned battery management system. As an example, the battery management system can be used in new energy vehicles, and can also be used in other devices and systems that require battery management.

[0110] In summary, the embodiment of the present invention enables each front-end unit to monitor the corresponding battery pack and the communication status of the daisy chain when the main control unit is in a sleep state. If a fault is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; when the main control unit is in a working state: starting from the front-end unit connected to the bridge chip, each front-end unit monitors the corresponding battery pack, and when a fault is detected, the corresponding front-end unit sends an alarm signal to the main control unit in the opposite direction of the communication direction, and when the alarm signal and the communication data encoding signal are on the same communication line, the alarm signal and the communication data encoding signal are superimposed and transmitted on each other, thereby achieving that the main control unit can receive the alarm signal in time in both the sleep state and the working state, and the main control unit does not need to access the front-end unit all the time, thereby avoiding the problem of excessive load on the main control unit.

[0111] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A daisy chain reverse wake-up method, characterized in that: The method comprises: a main control unit, a battery management unit, a bridge chip, N front-end units and N battery packs, wherein the first end and the second end of the battery management unit are respectively coupled to the first end of the main control unit and the first end of the bridge chip, the second end of the main control unit is coupled to the second end of the bridge chip, the third end of the bridge chip is coupled to the input ends of the N front-end units, each front-end unit is correspondingly coupled to a battery pack, and the front-end units are connected through communication connection lines to form a daisy chain, wherein N is an integer greater than 1; The method comprises: When the main control unit is in a dormant state, the following steps are performed: Controlling each front-end unit to monitor the corresponding battery pack; and Periodically sending a heartbeat signal to a previous front-end unit along the communication direction of the daisy chain; Monitoring the heartbeat signal sent by the next front-end unit within a preset time; The working state of the daisy chain is determined according to the monitoring situation, wherein if a battery pack failure or a communication failure between the front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; When the main control unit is in working state, the following steps are performed: Starting from the front-end unit connected to the bridge chip, control N front-end units to sequentially receive communication data coded signals along the communication direction, and the communication data coded signal received by the i-th front-end unit along the communication direction includes data information of the 1st front-end unit to the i-1th front-end unit; wherein N≥i>1; and Fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

2. The reverse wake-up method of the daisy chain according to claim 1, characterized in that: The method further comprises: When the main control unit is in working state, the main control unit is controlled to send an access signal to the bridge chip to access the data of the N front-end units.

3. The reverse wake-up method of the daisy chain according to claim 2, characterized in that: When the main control unit is in working state, the control bridge chip converts the access signal into the communication data encoding signal upon receiving the access signal and sends it to the front-end unit connected to the bridge chip.

4. The reverse wake-up method of the daisy chain according to claim 1, characterized in that: The communication data encoding signal and the alarm signal have different frequencies.

5. A battery management system capable of executing the daisy chain reverse wake-up method according to any one of claims 1 to 4, characterized in that: include: Main control unit, battery management unit, bridge chip, N front-end units and N battery packs; The first end and the second end of the battery management unit are respectively coupled to the first end of the main control unit and the first end of the bridge chip, the second end of the main control unit is coupled to the second end of the bridge chip, and the third end of the bridge chip is coupled to the input end of N front-end units, each front-end unit is correspondingly coupled to a battery pack, and the front-end units are connected through communication connection lines to form a daisy chain, wherein N is an integer greater than 1; The front-end unit is used to monitor the corresponding battery pack when the main control unit is in a dormant state; Periodically sending a heartbeat signal to a previous front-end unit along the communication direction of the daisy chain; Monitoring the heartbeat signal sent by the next front-end unit within a preset time; Determining the working state of the daisy chain according to the monitoring situation, wherein, if a battery pack failure or a communication failure between front-end units is detected, the corresponding front-end unit transmits an alarm signal to the battery management unit in the opposite direction of the communication direction to wake up the main control unit; and When the main control unit is in working state, starting from the front-end unit connected to the bridge chip, the communication data encoding signal is received in sequence along the communication direction, wherein the communication data encoding signal received by the i-th front-end unit along the communication direction includes data information of the 1st front-end unit to the i-1th front-end unit; wherein N≥i>1; Fault detection is performed on N battery packs, and when a fault is detected, the corresponding front-end unit sends the alarm signal to the main control unit in the opposite direction of the communication direction, wherein the transmission directions of the alarm signal and the communication data coding signal are opposite, and when the alarm signal and the communication data coding signal are on the same communication line, the alarm signal and the communication data coding signal are superimposed on each other.

6. The battery management system according to claim 5, characterized in that: When the main control unit is in working state, the main control unit is also used to send access signals to the N front-end units for accessing data of the N front-end units.

7. The battery management system according to claim 6, characterized in that: The main control unit sends an access signal to the N front-end units through the bridge chip; The bridge chip is also used for converting the access signal into the communication data encoding signal when receiving the access signal, and sending the communication data encoding signal to the front-end unit connected to the bridge chip.

8. The battery management system according to claim 5, characterized in that: The front-end unit includes a high-frequency signal driving subunit and a low-frequency signal driving subunit; wherein the frequencies of the communication data encoding signal and the alarm signal are different; The high-frequency signal driving subunit is used to transmit the communication data encoding signal or the alarm signal; The low-frequency signal driving subunit is used to transmit the communication data encoding signal and the alarm signal.

9. The battery management system according to claims 5 to 8, characterized in that: The bridge chip is connected to one end of the N front-end units.

10. The battery management system according to claims 5 to 8, characterized in that: The bridge chip is connected end to end with the Nth front-end unit to form a daisy chain ring network.

11. A device, characterized in that: A battery management system comprising the battery management system according to any one of claims 5 to 10.

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