E2c protocol-based battery management controller and system thereof, and power supply system

Abstract

Embodiments of the present application relate to an E2C protocol-based battery management controller and a system thereof, and a power supply system. The battery management controller comprises an interface connector, a level shifter circuit, and a battery management chip; the interface connector is configured to connect to a battery pack so as to receive a battery pack information signal sent by the battery pack; the level shifter circuit is separately connected to the interface connector and the battery management chip, and is configured to perform step-down processing on the battery pack information signal and transmit the stepped-down battery pack information signal to the battery management chip; the battery management chip is configured to generate a discharge control signal on the basis of the battery pack information signal; and the level shifter circuit is further configured to perform step-up processing on the discharge control signal and transmit the stepped-up discharge control signal to the battery pack by means of the interface connector so as to adjust a discharge state of the battery pack.

Description

Battery management controller based on E2C protocol and system and power supply system thereof TECHNICAL FIELD

[0001] The embodiments of the present application relate to the technical field of battery, in particular to a battery management controller based on E2C protocol and system and power supply system thereof. BACKGROUND

[0002] In the prior art, notebook computers, tablet computers and other consumer electronics using X86 systems are widely used, and the above products usually use I2C protocol to realize communication between the controller and the battery pack. However, the I2C protocol can only meet the communication needs of the battery pack of daily products, and its power supply capacity is insufficient, which cannot be applied to the communication needs of the battery pack of mobile robots, medical and special fields.

[0003] SUMMARY

[0004] Therefore, it is necessary to provide a battery management controller based on E2C protocol and system and power supply system thereof which can have better power supply capacity.

[0005] In a first aspect, the present application provides a battery management controller based on E2C protocol, comprising an interface connector, a level conversion circuit and a battery management chip.

[0006] The interface connector is used to connect the battery pack to receive the battery pack information signal sent by the battery pack.

[0007] The level conversion circuit is connected with the interface connector and the battery management chip respectively, and is used to perform voltage reduction processing on the battery pack information signal and transmit the voltage reduction processed battery pack information signal to the battery management chip.

[0008] The battery management chip is used to generate a discharge control signal according to the battery pack information signal.

[0009] The level conversion circuit is further used to perform voltage increase processing on the discharge control signal, and transmit the voltage increase processed discharge control signal to the battery pack through the interface connector to adjust the discharge state of the battery pack.

[0010] In one embodiment, the battery management controller is configured with a power supply pin, a signal input pin, a signal output pin and a ground pin.

[0011] The signal input pin is used to transmit the battery pack information signal, and the signal output pin is used to transmit the discharge control signal.

[0012] The battery management controller is configured to receive a power supply signal from the battery pack via the power supply pin and the ground pin.

[0013] In one of the embodiments, the number of the power supply pin and the ground pin is two.

[0014] In one of the embodiments, the battery management controller is further configured with a battery detection pin, which is configured to transmit an insertion detection signal in the case of battery pack insertion.

[0015] The battery management chip is further connected with the battery detection pin, and the battery management chip is further configured to generate an information acquisition signal in response to the insertion detection signal, so as to instruct the battery pack to transmit the battery pack information signal.

[0016] In one of the embodiments, the battery management chip comprises:

[0017] A processing module connected with the level conversion circuit, configured to generate a discharge control signal according to the battery pack information signal.

[0018] A storage module connected with the processing module, configured to store the battery pack information carried by the battery pack information signal.

[0019] In one of the embodiments, the battery pack information signal and the discharge control signal each comprises a 1-bit start bit, an 8-bit data bit and a 1-bit stop bit.

[0020] A battery management system, comprising:

[0021] The battery management controller based on the E2C protocol as described above, further comprising a communication module.

[0022] A computer configured with an operating system, which communicates with the communication module of the battery management controller via a computer bus.

[0023] In one of the embodiments, further comprising:

[0024] A human body sensor connected with the battery management controller, configured to generate a user leaving signal to instruct the battery management controller to control the computer to be turned off in the case of no detection of human body for more than a preset time length, and / or generate a user operation signal to instruct the battery management controller to control the computer to be kept on in the case of detection of human body.

[0025] In one of the embodiments, the user leaving signal is a low-level signal, and the user operation signal is a high-level signal.

[0026] The battery management controller is configured to control the computer to start and shut down according to the level state of the signal output by the human body sensor.

[0027] A power supply system comprises:

[0028] A battery pack;

[0029] The battery management system as described above is connected with the battery pack to control the discharge state of the battery pack.

[0030] The battery management controller and system based on the E2C protocol and the power supply system are connected between the battery pack and the battery management controller through the interface connector, and provide the communication basis of both. The voltage of the signal transmitted between the battery pack and the battery management chip is adjusted by the level conversion circuit, so that the battery pack and the battery management chip are well adapted. Moreover, the battery management chip can accurately learn the real-time condition of the battery pack based on the battery pack information signal, so as to determine the power supply signal suitable for the load according to the condition of the battery pack, so that the battery pack can intelligently discharge, improve the power supply capacity for the load under the premise of avoiding the waste of electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Fig. 1 is a structural schematic diagram of a battery management controller according to an embodiment;

[0033] Fig. 2 is a pin schematic diagram of a battery management controller according to an embodiment;

[0034] Fig. 3 is a structural schematic diagram of a battery management system according to an embodiment;

[0035] Fig. 4 is a structural schematic diagram of a battery management system according to an embodiment;

[0036] Fig. 5 is a structural schematic diagram of a power supply system according to an embodiment.

[0037] Element number explanation: battery management controller: 10; interface connector: 100; level conversion circuit: 200; battery management chip: 300; battery pack: 20; battery management module: 410; computer: 30; human body sensor: 40. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0039] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first discharge power can be referred to as the second discharge power, and similarly, the second discharge power can be referred to as the first discharge power.

[0040] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. The meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. The meaning of "several" is at least one, such as one, two, etc., unless otherwise explicitly and specifically limited.

[0041] The embodiments of the present application provide a battery management controller based on E2C protocol. FIG. 1 is a structural schematic diagram of a battery management controller according to an embodiment. In FIG. 1, a battery pack associated with the battery management controller is also shown for ease of description. Referring to FIG. 1, the battery management controller 10 includes an interface connector 100, a level conversion circuit 200, and a battery management chip 300.

[0042] The interface connector 100 is configured to connect the battery pack 20 to receive a battery pack information signal sent by the battery pack 20. The battery pack information signal carries battery pack information. The battery pack information includes, but is not limited to, battery capacity information, battery temperature information, battery internal resistance, etc. The battery management chip 300 is configured to generate a discharge control signal according to the battery pack information signal, and the discharge control signal is used to control the timing of discharging the battery pack 20 to the load and the power of discharging the battery pack 20 to the load. For example, the battery management chip 300 can learn the remaining capacity of the battery pack 20 according to the battery capacity information carried by the battery pack information signal, and control the battery pack 20 to discharge to the load when the remaining capacity is greater than 5%. For another example, the battery management chip 300 can learn the remaining capacity of the battery pack 20 according to the battery capacity information carried by the battery pack information signal, and control the battery pack 20 to discharge to the load at a first discharge power when the remaining capacity is greater than 80%, and discharge to the load at a second discharge power when the remaining capacity is less than 30%, wherein the first discharge power is greater than the second discharge power.

[0043] The level conversion circuit 200 is connected with the interface connector 100 and the battery management chip 300 respectively, and is used for performing voltage reduction processing on the battery pack information signal and transmitting the battery pack information signal after the voltage reduction processing to the battery management chip 300. That is, the voltage of the battery pack information signal output by the battery pack 20 is higher than the voltage that can be borne by the battery management chip 300. For example, the maximum voltage of the signal that can be transmitted and received by the battery pack 20 is 5V, and the maximum voltage of the signal that can be transmitted and received by the battery management chip 300 is 3.3V. Therefore, the voltage reduction processing on the battery pack information signal can ensure that the battery pack information is not lost, and enable the battery management chip 300 to receive and process the battery pack information signal. Further, the level conversion circuit 200 is also used for performing voltage increase processing on the discharge control signal, and transmitting the discharge control signal after the voltage increase processing to the battery pack 20 through the interface connector 100, so as to adjust the discharge state of the battery pack 20. That is, the voltage of the discharge control signal output by the battery management chip 300 is lower than the communication voltage of the battery pack 20, and therefore, the voltage increase processing on the battery pack information signal can avoid the battery pack 20 from identifying the high level output by the battery management chip 300 as a low level, so as to avoid signal receiving errors of the battery pack 20 and improve the reliability of signal transmission and reception.

[0044] It should be noted that in the embodiment shown in FIG. 1, the battery management controller 10 includes two level conversion circuits 200, one of which is used for performing voltage reduction processing on the battery pack information signal, and the other of which is used for performing voltage increase processing on the discharge control signal. However, in other embodiments, only one level conversion circuit 200 can be configured, and the level conversion circuit 200 can be configured to perform voltage increase processing and voltage reduction processing in time division.

[0045] In this embodiment, the interface connector 100 is used to connect the battery pack 20 and the battery management controller 10, and provides a communication basis for the two. The voltage of the signal transmitted between the battery pack 20 and the battery management chip 300 is adjusted by the level conversion circuit 200, so that the battery pack 20 and the battery management chip 300 can be well adapted. Further, the battery management chip 300 can accurately learn the real-time condition of the battery pack 20 based on the battery pack information signal, so as to determine the power supply signal according to the condition of the battery pack 20, so that the battery pack 20 can intelligently discharge, and the power supply capability for the load can be improved while avoiding waste of electric energy.

[0046] In one of the embodiments, the battery management controller 10 is further configured to generate a charging control signal according to the battery pack information signal, so that the battery pack 20 is charged according to the charging control signal when connected to the adapter. The charging control signal can be used to control the charging time, charging power, etc. of the battery pack 20, which is not limited in the embodiment.

[0047] In one of the embodiments, the battery management controller 10 is configured with a power supply pin VCC, a signal input pin RXD, a signal output pin TXD and a ground pin GND. It can be understood that the battery pack 20 is also provided with pins matched with the battery management controller 10, specifically, the battery pack 20 side can be provided as a jack, and the battery management controller 10 side can be provided as a pin. Alternatively, FIG. 2 is a pin diagram of the battery management controller 10 in one of the embodiments, referring to FIG. 2, the pins can be arranged in an array to be stably and reliably connected through a communication line with multiple pins.

[0048] The signal input pin RXD is used to transmit the battery pack information signal, and the signal output pin TXD is used to transmit the discharge control signal, the charging control signal, etc. The battery management controller 10 is configured to receive the power supply signal provided by the battery pack 20 through the power supply pin VCC and the ground pin GND, that is, the battery pack 20 is also configured to supply power to the battery management controller 10 through the power supply pin VCC and the ground pin GND to support the operation of the battery management controller 10. It can be understood that for a fixedly arranged desktop computer or other electronic device, it can be directly connected to the mains for power supply. However, for a mobile electronic device, if it is still powered by the mains, it will cause inconvenience in use. Moreover, since the I2C communication interface only has two communication lines, the battery pack 20 using the I2C protocol cannot directly supply power to the battery management controller 10 through the communication lines. Therefore, the new communication interface is adopted in the embodiment, so that the battery management controller 10 can also be powered by the battery pack 20 when controlling the battery pack 20, which greatly improves the convenience of use.

[0049] In one of the embodiments, the number of power supply pins VCC and ground pins GND is two, and the power supply pins VCC and ground pins GND are arranged in pairs. It can be understood that the current of the power supply signal provided by a single pin has an upper limit. Therefore, two power supply pins VCC and two ground pins GND can be arranged to provide a stronger current supply of the power supply signal to the battery management controller 10 and the like. Further, the battery management controller 10 can generate a discharge control signal according to its own power consumption demand in combination with the battery pack information signal. Specifically, if the battery management controller 10 is in a standby state, the battery pack 20 can be controlled to discharge through only one group of pins by the discharge control signal; if the battery management controller 10 is in a running state, the battery pack 20 can be controlled to discharge synchronously through two groups of pins by the discharge control signal to provide greater current, thereby supporting the running of the battery management controller 10.

[0050] Further, the battery pack 20 can send the load information of the connected loads, such as the number, type and power of the loads, to the battery management controller 10 as the battery pack information signal, and the battery management controller 10 allocates the output power of the battery pack 20 according to the load information, so that different loads can run under the power supply of the battery pack 20. Accordingly, the more the number of the loads connected to the battery pack 20 and the more complex the types of the loads, the more operations the battery management controller 10 needs to perform. Therefore, the running state can be further subdivided into a low-load state and a high-load state, and the battery management can determine its state according to the number and type of the loads connected to the battery pack 20, so that in the case that the battery pack 20 discharges through two groups of pins, the current of each power supply signal is adjusted by the discharge control signal to adapt to the power supply demand of the battery management controller 10.

[0051] With reference back to FIG. 2, in one embodiment, the battery management controller 10 is further configured with a battery detection pin BAT IN, which is used to transmit an insertion detection signal in the case that the battery pack 20 is inserted. In this embodiment, the battery pack 20 can be in a detachable structure, so that the battery pack 20 can be replaced in the case that the battery pack 20 is aged, etc. The battery management chip 300 is also connected with the battery detection pin BAT IN, and the battery management chip 300 is further used to generate an information acquisition signal in response to the insertion detection signal, to instruct the battery pack 20 to send a battery pack information signal. That is, the battery detection pin BAT IN on the side of the battery pack 20 is connected with the battery detection pin BAT IN on the side of the battery management controller 10, so as to transmit the insertion detection signal to the battery management controller 10. In this embodiment, by adding the battery detection pin BAT IN, the battery management controller 10 can be automatically triggered to generate the information acquisition signal immediately after the battery pack 20 is inserted, so as to greatly simplify the operation required by the user after replacing the battery, and improve the convenience of use.

[0052] With reference back to FIG. 2, the battery management controller 10 can also be provided with a null pin NC, so as to extend the setting of the interface according to the use requirement, and improve the flexibility of communication.

[0053] In one embodiment, the battery management chip 300 includes a processing module and a storage module. The processing module is connected with the level conversion circuit 200, and is used to generate a discharge control signal according to the battery pack information signal. The storage module is connected with the processing module, and is used to store the battery pack information carried by the battery pack information signal. Specifically, the processing module can acquire the battery pack information stored in the storage module, and compare the historical information with the current information, so as to evaluate the running, aging, etc. of the battery pack 20, and realize accurate discharge control of the battery pack 20.

[0054] In one embodiment, the battery pack information signal and the discharge control signal each include 1 bit start bit, 8 bit data bit and 1 bit stop bit. In this embodiment, 115200 data bits per second can be configured for the battery pack 20 and the battery management controller 10, that is, the communication clock of the battery pack 20 and the battery management controller 10 is determined, so that the battery pack 20 and the battery management controller 10 can stably communicate. For example, the battery management controller 10 can send a sequence of "3A 30 30 30 32 31 36 30 30 30 45 30 31 7E" as the information acquisition signal, wherein each data occupies 10 bit data bit. For example, 3A in hexadecimal corresponds to 0011 1010 in binary, and 10 bits in total including the start bit and the stop bit.

[0055] Further, the communication mode can be master-slave response type, the host initiates the communication request, and the slave responds to the request, which has clear structure, simple control, high reliability, and can be well applied to the communication scene with less slaves. Optionally, the battery management controller 10 can be used as the host, and the battery pack 20 can be used as the slave. Further, the low-bit first transmission mode can be used for communication, which does not need complex circuit to adjust the order of bytes, and can also reduce the possibility of transmission error.

[0056] The embodiment of the application also provides a communication protocol, which can be referred to as E2C protocol. The E2C protocol is used to realize the communication between the battery pack 20 and the battery management controller 10. The communication protocol corresponds to the pin interface shown in FIG. 2. In one aspect, the communication protocol can realize the intelligent charging and discharging control of the battery pack 20, so as to improve the power supply capability of the battery pack 20, reduce unnecessary power loss of the battery pack 20, and achieve the energy-saving effect. In another aspect, the battery pack 20 can also supply power to the battery management controller 10, so as to adapt to more flexible use scenarios.

[0057] The host (battery management controller side) and the slave (battery pack side) communicate through the E2C protocol. The E2C protocol is a computer bus protocol. The protocol uses serial communication to realize end-to-end communication between the host and the slave, has high stability, and can guarantee the application in the field with high data reliability requirement such as mobile robots and medical treatment.

[0058] The host encodes the data to be sent in ASCII, starts with 3A (symbol ':'), ends with 7E (symbol '~'), and sends the protocol information to the battery pack side. The sent protocol information is as follows:

[0059]

[0060] After receiving the information acquisition signal sent by the battery management controller side, the battery pack side responds to the battery management controller side with the battery pack information in the fixed protocol format. Specifically, the battery pack response message data is also encoded in ASCII, starts with 3A (symbol ':'), and ends with 7E (symbol '~'). The battery pack information includes the following data:

[0061]

[0062] The battery management controller side analyzes the collected battery pack information. If an external adapter exists, the battery management controller side can set the battery capacity to be lower than a certain value, such as 10%, to automatically charge. The battery management controller side monitors the working state, temperature state, and rapid attenuation of the battery, and issues instructions such as stopping charging and discharging, discharging optimization, and current limiting energy saving to the battery. The operating system also reminds the administrator, realizes the intelligentization of the battery management system, and improves the working life of the battery.

[0063] Further, the E2C protocol between the master and the slave supports checking the data frame to improve the reliability of the communication data.

[0064] The battery management system also includes the computer 30. The battery management controller 10 further includes a communication module (not shown in the figure), and the computer 30 is configured with an operating system that communicates with the communication module of the battery management controller 10 through a computer bus. Specifically, the operating system can be, but is not limited to, a Windows system, a Linux system, etc. By setting the computer 30, the user can adjust and configure the battery management controller 10 through the computer 30 to improve the flexibility of the battery management controller 10, and can also extract the data stored in the battery management controller 10 to perform more in-depth power consumption evaluation and other operations. Further, the communication module is also connected with the level conversion circuit 200 and the battery management chip 300, and is used to perform the operations of increasing and decreasing the start bit and the stop bit.

[0065] Fig. 4 is a schematic structural view of the battery management system according to another embodiment. In one embodiment, the battery management system further includes a human body sensor 40. The human body sensor 40 is connected with the battery management controller 10, and is used to generate a user leaving signal to instruct the battery management controller 10 to control the computer 30 to be turned off when no human body is detected for more than a preset time length, and generate a user operation signal to instruct the battery management controller 10 to control the computer 30 to be kept on when a human body is detected. Specifically, when the user is always within the sensing range of the human body sensor 40, the human body sensor 40 can control the computer 30 to be kept on through the battery management controller 10, avoiding abnormal shutdown of the computer 30. When the user is away from the sensing range of the human body sensor 40 for more than a preset time length, it can be considered that the computer 30 is not needed to be operated for a short time, so the computer 30 is controlled to be turned off to achieve the effect of energy saving. Further, when the computer 30 is also powered by the battery pack 20, this can also reduce the utilization rate of the battery, thereby prolonging the service life of the battery.

[0066] In one of the embodiments, the battery management system further comprises a human body sensor 40. The human body sensor 40 is connected to the battery management controller 10, and is configured to generate a user leaving signal to instruct the battery management controller 10 to control the computer 30 to be turned off if no human body is detected for more than a preset time length.

[0067] In one of the embodiments, the battery management system further comprises a human body sensor 40. The human body sensor 40 is connected to the battery management controller 10, and is configured to generate a user leaving signal to instruct the battery management controller 10 to control the computer 30 to be turned off if no human body is detected for more than a preset time length.

[0068] In one of the embodiments, the user leaving signal is a low level signal, and the user operation signal is a high level signal. The battery management controller 10 is configured to control the computer 30 to be turned on and turned off according to the level state of the signal output by the human body sensor 40. In this embodiment, different level states are used for control, which can greatly reduce the control circuit required by the human body sensor 40, thereby simplifying the circuit architecture of the battery management system.

[0069] The embodiments of the present application further provide a power supply system. FIG. 5 is a structural schematic diagram of a power supply system according to an embodiment. As shown in FIG. 5, the power supply system comprises a battery pack 20 and a battery management system as described above. The battery management system is connected to the battery pack 20 to control the discharge state of the battery pack 20. Based on the battery management system described above, the power supply system according to the embodiment can achieve flexible and intelligent power supply, thereby improving the utilization rate and efficiency of the battery pack 20. Further, the battery pack 20 comprises a battery and a battery management module 410. The battery management module 410 is connected to the battery and connected to a load to obtain load power. The battery management module 410 is configured to generate a battery pack information signal according to the power of the battery and the load power, thereby improving the accuracy of the discharge control signal generated by the battery management controller 10.

[0070] Any combination of the above technical features can be made. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0071] The above embodiments only express several implementation manners of the embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that, for those skilled in the art, without departing from the concept of the embodiments of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application should be subject to the appended claims.

Claims

1. A battery management controller based on the E2C protocol, characterized in that: Includes interface connector, level conversion circuit and battery management chip; The interface connector is used to connect to the battery pack to receive the battery pack information signal sent by the battery pack; The level conversion circuit is connected to the interface connector and the battery management chip respectively, and is used to reduce the voltage of the battery pack information signal and transmit the reduced-voltage battery pack information signal to the battery management chip; The battery management chip is used to generate a discharge control signal according to the battery pack information signal; The level conversion circuit is further configured to perform a voltage boost process on the discharge control signal, and transmit the boosted discharge control signal to the battery pack via the interface connector to adjust the discharge state of the battery pack.

2. The battery management controller according to claim 1, characterized in that: The battery management controller is configured with a power pin, a signal input pin, a signal output pin and a ground pin; The signal input pin is used to transmit the battery pack information signal, and the signal output pin is used to transmit the discharge control signal; The battery management controller is configured to receive a power supply signal from the battery pack via the power pin and the ground pin.

3. The battery management controller according to claim 2, characterized in that: The number of the power pins and the number of the ground pins are both two.

4. The battery management controller according to claim 2, characterized in that: The battery management controller is further configured with a battery detection pin, which is used to transmit an insertion detection signal when a battery pack is inserted; The battery management chip is also connected to the battery detection pin, and is further configured to generate an information acquisition signal in response to the insertion detection signal to instruct the battery pack to send the battery pack information signal.

5. The battery management controller according to any one of claims 1 to 4, characterized in that: The battery management chip includes: a processing module connected to the level conversion circuit, and configured to generate a discharge control signal according to the battery pack information signal; A storage module is connected to the processing module and is used to store the battery pack information carried by the battery pack information signal.

6. The battery management controller according to claim 1, characterized in that: The battery pack information signal and the discharge control signal respectively include a 1-bit start bit, 8-bit data bits, and a 1-bit stop bit.

7. A battery management system, characterized in that: include: The E2C protocol-based battery management controller according to any one of claims 1 to 6, further comprising a communication module; The computer is configured with an operating system, and the operating system communicates with the communication module of the battery management controller via a computer bus.

8. The battery management system according to claim 7, characterized in that: Also includes: A human body sensor is connected to the battery management controller and is used to generate a user departure signal to instruct the battery management controller to control the computer to shut down when no human body is detected for more than a preset time; and / or to generate a user operation signal to instruct the battery management controller to control the computer to remain on when a human body is detected.

9. The battery management system according to claim 8, characterized in that: The user leaving signal is a low level signal, and the user operation signal is a high level signal; The battery management controller is used to control the computer to start and stop according to the level state of the signal output by the human body sensor.

10. A power supply system, characterized in that: include: Battery pack; The battery management system according to any one of claims 7 to 9, wherein the battery management system is connected to the battery pack to control the discharge state of the battery pack.

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