CN115498731A

CN115498731A - BMS state switching system

Info

Publication number: CN115498731A
Application number: CN202211166884.9A
Authority: CN
Inventors: 陈龙扣; 黄鹏; 原亮亮
Original assignee: Shenzhen Baseus Technology Co Ltd
Current assignee: Shenzhen Baseus Technology Co Ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2022-12-20

Abstract

The embodiment of the application discloses a BMS state switching system, which at least comprises a battery, a BMS protection board connected with the battery and a wake-up circuit arranged on the BMS protection board; when the system is connected to charging equipment, the wake-up circuit is used for charging and activating the BMS protection board, so that the BMS protection board enters an operating state from a dormant state; the BMS protection board is used for receiving a load working signal, and the BMS protection board switches between the running state and the standby state according to the load working signal; the BMS protection board is further configured to determine a battery voltage of the battery, and the BMS protection board enters the sleep state from the operating state or the standby state when the battery voltage is lower than a threshold voltage.

Description

BMS state switching system

Technical Field

The present application relates to, but is not limited to, the technical field of battery management, and in particular, to a BMS status switching system.

Background

In consideration of energy consumption and environmental pollution, the related art has strengthened development of green energy related technologies, so that new energy products based on lithium ion batteries are rapidly developed, and at present, lithium ion batteries all use a Battery Management System (BMS).

However, when the battery management system is used, it is necessary to reasonably control the power consumption of the battery management system, otherwise, a series of problems such as SOC self-abnormal integration due to excessive power consumption, abnormal heat generation, and over-discharge due to abnormal power consumption may occur.

Disclosure of Invention

Based on the problems in the related art, the embodiment of the application provides a BMS status switching system.

The technical scheme of the embodiment of the application is realized as follows:

the embodiment of the application provides a BMS state switching system, which at least comprises a battery, a BMS protection board connected with the battery and a wake-up circuit arranged on the BMS protection board;

when the system is connected to charging equipment, the wake-up circuit is used for charging and activating the BMS protection board, so that the BMS protection board enters an operating state from a dormant state;

the BMS protection board is used for receiving a load working signal, and the BMS protection board switches between the running state and the standby state according to the load working signal;

the BMS protection board is further configured to determine a battery voltage of the battery, and the BMS protection board enters the sleep state from the operation state or the standby state when the battery voltage is lower than a threshold voltage.

In some embodiments, the BMS protection board includes at least a micro control unit; the wake-up circuit at least comprises a charging wake-up circuit, a charging activation circuit, a DC/DC control circuit and a DC/DC converter;

the charging wake-up end of the charging wake-up circuit is connected with the charging activation circuit, the output end of the charging activation circuit is connected with the DC/DC control circuit, the voltage output end of the DC/DC control circuit is connected with the DC/DC converter, and the output end of the DC/DC converter is connected with the micro control unit.

In some embodiments, the charge wake-up circuit comprises at least a first transistor and a second transistor;

a first base electrode of the first triode is grounded through a first resistor, a first emitter of the first triode is connected with the negative electrode of the charging equipment, and a second resistor is connected between the first emitter and the first base electrode; the first collector of the first triode is connected with the second base of the second triode through a third resistor, a fourth resistor is connected between the second emitter of the second triode and the second base, the second emitter of the second triode is connected with an access voltage, and the second collector of the second triode is connected with the charging awakening end.

In some embodiments, the BMS protection board includes at least a discharging MOS and a charging MOS connected in series, a source of the discharging MOS is connected to a negative electrode of the battery through a shunt, and a drain of the discharging MOS is connected to a drain of the charging MOS;

when the system is connected to the charging equipment in the dormant state, the discharging MOS and the charging MOS are disconnected, and the first triode is connected;

and a second emitter of the second triode is connected with the access voltage, the second triode is conducted, and the charging awakening end outputs a preset level.

In some embodiments, the DC/DC control circuit includes at least a fifth resistor and a first switch; the grid electrode of the first switch is connected with the output end through a fifth resistor, and the drain electrode of the first switch is connected with the voltage output end; the DC/DC converter at least comprises an input pin which is connected with the voltage output end;

when the charging wake-up terminal outputs a preset level, the output end of the charging activation circuit connected with the charging wake-up terminal outputs the preset level, the first switch of the DC/DC control circuit is switched on, and the DC/DC converter outputs an output voltage with a preset threshold value, so that the BMS protection board is powered on;

and when the BMS protection board is powered on, the BMS protection board enters the running state from the dormant state.

In some embodiments, the wake-up circuit further comprises a DC/DC output control circuit;

the DC/DC output control circuit at least comprises a third triode and a fourth triode, and a third base electrode of the third triode is connected with an output pin of the micro-control unit through a sixth resistor; a third emitter of the third triode is grounded, and a ninth resistor is connected between the third emitter and the third base;

a third collector electrode of the third triode is connected with a fourth base electrode of the fourth triode through an eighth resistor; a fourth emitter of the fourth triode is connected with the access voltage, and a ninth resistor is connected between the fourth emitter and the fourth base; a fourth collector of the fourth triode is connected with the charging activation circuit;

after the BMS protection board is powered on, the output pin of the micro control unit outputs a preset level, and the third triode and the fourth triode are conducted, so that the DC/DC converter can continuously output an output voltage with a preset threshold value.

In some embodiments, the BMS protection board includes at least a micro control unit; the load working signal at least comprises a load current and a load signal;

and the micro control unit is used for controlling the BMS protection board to enter the standby state from the running state when the load current in a preset time period is less than a preset threshold value or a load signal is not received in the preset time period.

In some embodiments, the load operation signal further comprises a protection signal;

when the BMS protection board is in the standby state, the micro control unit is further configured to control the BMS protection board to enter the operating state from the standby state when a load current is detected, a load signal is received, or a protection signal is received.

In some embodiments, the BMS protection board includes at least a micro control unit and a front end acquisition module connected to each other;

the front-end acquisition module is used for determining the battery voltage of the battery;

when the battery voltage is lower than a threshold voltage, the micro control unit is used to control the BMS protection board to shift from the operating state or the standby state to the sleep state.

In some embodiments, when the BMS protection board is in the operating state, both the micro control unit and the front end acquisition module are in the operating state;

when the BMS protection board is in the standby state, the micro control unit is in a dormant state, and the front-end acquisition module is in an operating state;

when the BMS protection board is in the dormant state, the micro control unit and the front end acquisition module are both in the dormant state.

The BMS state switching system that this application embodiment provided, through inserting battery charging outfit, through wake-up circuit activation BMS protection shield, the BMS protection shield gets to the electricity initialization back, and the BMS protection shield shifts into the running state from the dormancy state, and the BMS protection shield accepts the operating signal of load, switches between running state and standby state according to the operating signal of load, and under-voltage or storage dormancy state entering dormancy state when the BMS protection shield. Therefore, the wake-up circuit is added on the basic frame of the BMS protection board, and the multi-stage state conversion of the BMS protection board is realized by the mutual cooperation of the wake-up circuit and the multi-stage low-power switching strategy of the BMS, so that the embodiment of the application not only can reduce the overall operation power consumption of the BMS protection board, ensures the reasonable distribution of the power consumption of the BMS protection board, solves the problem of the system self-power consumption of the lithium battery, improves the stability and the safety of the BMS protection board, increases the endurance time of the whole machine, and improves the user experience; and this application embodiment has only increased wake-up circuit on the frame of BMS protection shield, has reduced system development cost.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic circuit diagram of a BMS state switching system according to an embodiment of the present application;

fig. 2 is a schematic circuit diagram of another BMS status switching system provided by an embodiment of the present application;

fig. 3 is a circuit schematic diagram of a charge wake-up circuit provided in an embodiment of the present application;

FIG. 4 is a circuit schematic diagram of a charge activation circuit and a DC/DC output control circuit provided by an embodiment of the present application;

FIG. 5 is a circuit schematic diagram of a DC/DC control circuit and a DC/DC converter provided by an embodiment of the application;

fig. 6 is a schematic diagram of switching states of a BMS protection board according to an embodiment of the present application.

Detailed Description

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, the described embodiments should not be considered as limiting the present application, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

In the following description, references to the terms "first \ second \ third" are only to distinguish similar objects and do not denote a particular order, but rather the terms "first \ second \ third" are used to interchange specific orders or sequences, where appropriate, so as to enable the embodiments of the application described herein to be practiced in other than the order shown or described herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.

Currently, new energy products based on lithium ion batteries are rapidly developed, and a battery management system BMS is required in places with lithium batteries, for example: the electric power generation system comprises an electric power generation and conversion system, an outdoor energy storage system and a mobile electric tool. It becomes very important to control the power consumption of the complex small-capacity battery system, and if the power consumption is not well controlled, a series of problems may be caused, for example, a series of problems that the SOC self-abnormal integral, abnormal heating and abnormal power consumption caused by the excessive power consumption cause over-discharge, the service time and the storage time are shortened, and the customer experience is affected, and therefore a reliable low-power solution is required.

Based on the problems in the related art, the embodiment of the present application provides a BMS status switching system, and fig. 1 is a schematic circuit diagram of the BMS status switching system provided by the embodiment of the present application, and as shown in fig. 1, the BMS status switching system at least comprises a battery 101, a BMS protection plate 102 connected to a negative electrode of the battery, and a wake-up circuit 103 disposed on the BMS protection plate. Wherein, B + is the anode of the battery, and B-is the cathode of the battery. P + and P-represent the positive and negative battery electrodes that are brought out through the BMS protection plate.

In some embodiments, when the BMS status switching system is connected to a charging device, the positive electrode C + of the charging device is connected to P +, and the wake-up circuit 103 is configured to activate the charging of the BMS protection board 102, so that the BMS protection board 102 enters an operating state from a sleep state. Here, the sleep state may refer to a powerdown mode (PD mode) in which only the wake-up circuit 103 is reserved so that the BMS protection board 102 may be activated by the wake-up circuit 103 when the charging device is accessed. The operation state may refer to a RUN mode in which the BMS protects the protection module of the board 102, the SOC module, the malfunction alarm, the history, and the like, from operating at full power.

In some embodiments, the BMS protection board 102 is configured to receive a load operation signal, and the BMS protection board 102 switches between the operating state and the standby state according to the load operation signal. The standby state may refer to an IDLE mode, in which a part of functions are reserved to operate, for example, a protection module, an alarm module, and an IWDOG independent watchdog operate in an RTC dog feeding mechanism and an information reporting mechanism, and other modules enter a sleep state.

In some embodiments, the BMS protection board 102 further includes a micro control unit 104, as shown in fig. 2, and fig. 2 is a schematic circuit diagram of another BMS status switching system provided by the embodiments of the present application. The load working signal at least comprises a load current and a load signal; the mcu 104 is configured to control the BMS protection board 102 to enter the standby state from the operating state when the load current within a preset time period is less than a preset threshold, or a load signal is not received within a preset time period, and the clock frequency of the BMS protection board 102 is reduced from 24 megahertz (MHz) to 20 kilohertz (KHz). Here, the preset time may be 30 seconds(s), the preset threshold may be 40 milliamperes (mA), and the preset time and the preset threshold in the embodiment of the present application may also be set according to the operating parameters of the battery and the load.

In some embodiments, the micro control Unit 104 may be a single chip Microcomputer (MCU) or a control IC.

In some embodiments, the load operation signal further includes protection signals, such as a battery overcharge signal, a battery overdischarge signal, and a battery overcurrent signal. When the BMS protection board 102 is in the standby state, the micro control unit 104 is further configured to control the BMS protection board 102 to enter the operating state from the standby state when a load current is detected, a load signal is received, or a protection signal is received.

In some embodiments, the BMS protection board 102 is further configured to determine a battery voltage of the battery 101, and the BMS protection board 102 enters the sleep state from the operating state or the standby state when the battery voltage is below a threshold voltage. Here, the threshold voltage may be 2.5V, and the BMS protection board 102 enters the sleep state from the operation state or the standby state when the battery voltage is lower than 2.5V.

In some embodiments, the BMS protection board further includes a front end collecting module 105 connected to the micro control unit 104, and the BMS protection board 102 determines the battery voltage of the battery 101 through the front end collecting module 105, and the micro control unit 104 is configured to control the BMS protection board 102 to enter the sleep state from the operation state or the standby state when the battery voltage is lower than a threshold voltage.

In some embodiments, the BMS protection board 102 further includes a discharging MOS 106 and a charging MOS 107 connected in series, a source of the discharging MOS 106 is connected to a negative electrode of the battery 101 via a shunt 108, and a drain of the discharging MOS 106 is connected to a drain of the charging MOS 107.

In some embodiments, when the BMS protection board 102 is in the operating state, the micro control unit 104 and the front end collection module 105 are both in the operating state, and the opening and closing of the discharge MOS 106 and the charge MOS 107 are determined by the protection module of the BMS protection board 102, for example, when the battery is in the charging state, the discharge MOS 106 may be closed and the charge MOS 107 may be opened; when the battery is in a discharged state, the charging MOS 107 may be closed and the discharging MOS 106 may be opened. When the BMS protection board 102 is in an operating state, the power consumption of the BMS protection board 102 is less than 10 milliampere-hours (mAh).

When the BMS protection board 102 is in the standby state, the micro control unit 104 is in a sleep state, the front end acquisition module 105 is in an operating state, and the charging MOS 107 and the discharging MOS 106 are turned on. When the BMS protection board 102 is in the sleep state, the power consumption of the BMS protection board 102 is less than 1 milliampere-hour (mAh).

When the BMS protection board 102 is in the sleep state, the micro control unit 104 and the front end collection module 105 are both in the sleep state, and the charging MOS 107 and the discharging MOS 106 are closed. When the BMS protection board 102 is in the sleep state, the power consumption of the BMS protection board 102 is less than 1 microampere hour (uAh).

The BMS state switching system that this application embodiment provided, through inserting battery charging outfit, through wake-up circuit activation BMS protection shield, the BMS protection shield gets into the electricity initialization back, and the running state is shifted into from the dormancy state to the BMS protection shield, and the BMS protection shield accepts the operating signal of load, and according to the operating signal of load change between running state and standby state, gets into the dormancy state when the BMS protection shield is under-voltage or storage dormancy state. Therefore, the awakening circuit is added on the basic frame of the BMS protection board, and the awakening circuit is matched with the BMS multi-level low-power-consumption switching strategy, so that the effect of reducing the overall operation power consumption of the BMS protection board can be achieved, the reasonable distribution of the power consumption of the BMS protection board is guaranteed, the problem of the self-power consumption of a system of a lithium battery is solved, the stability and the safety of the BMS protection board are improved, the endurance time of the whole machine is prolonged, and the user experience is improved; and this application embodiment has only increased wake-up circuit on the frame of BMS protection shield, has reduced system development cost.

In some embodiments, the wake-up circuit may include at least a charge wake-up circuit, a charge activation circuit, a DC/DC control circuit, and a DC/DC converter; the charging wake-up end of the charging wake-up circuit is connected with the charging activation circuit, the output end of the charging activation circuit is connected with the DC/DC control circuit, the voltage output end of the DC/DC control circuit is connected with the DC/DC converter, and the output end of the DC/DC converter is connected with the micro control unit.

Fig. 3 is a schematic circuit diagram of a charging wake-up circuit according to an embodiment of the present disclosure, and as shown in fig. 3, the charging wake-up circuit at least includes a first transistor Q1 and a second transistor Q2; a first base electrode of the first triode Q1 is grounded through a first resistor R1, a first emitter of the first triode Q1 is connected with a negative electrode (P-/C-) of the charging equipment through a first diode D1, a second resistor R2 is connected between the first emitter and the first base electrode, and the second resistor R2 is connected with a first capacitor C1 in parallel; the first collector of the first triode Q1 is connected with the second base of the second triode Q2 through a third resistor R3, a second emitter of the second triode Q2 is connected with a fourth resistor R4 between the second base, the fourth resistor R4 is connected with a second capacitor C2 in parallel, the second emitter of the second triode Q2 is connected with an access voltage VCC, and the second collector of the second triode Q2 is connected with a charging wake-up end CHG WakeUp.

In some embodiments, when the system is connected to the charging device in the sleep state, the discharging MOS and the charging MOS are disconnected, the voltage at the P +/P-output port of the BMS protection board is 0V, the charging device C +, C-is connected at this time, since the charging MOS transistor is disconnected from the discharging MOS transistor, the potential at the B-is equal to the potential at the C +, and therefore the B-potential is higher than the C-, and the charging wake-up circuit operates. In the embodiment of the present application, the potential at the ground GND is equal to the potential at B-, so the potential of the first base in the first transistor Q1 is higher than the potential of the first emitter, so that the first transistor Q1 is turned on. The second emitter of the second triode Q2 is connected with the access voltage VCC, so that the potential of the second emitter is higher than the potential of the second base, the second triode Q2 is turned on, and the charging wake-up end CHG WakeUp outputs a preset level, that is, the CHG WakeUp outputs a high level.

Fig. 4 is a circuit schematic diagram of a charging activation circuit and a DC/DC output control circuit provided in an embodiment of the present application, and as shown in fig. 4, the charging activation circuit includes a second diode D2 and a first activation resistor R93 connected in series with the second diode D2, and the charging activation circuit is connected to the charging wake-up circuit through a charging wake-up terminal CHG WakeUp. The output terminal SHIP pin of the charging activation circuit is grounded through a second activation resistor R96, and the second activation resistor R96 is connected in parallel with a third capacitor C3. The charging wake-up terminal CHG WakeUp up outputs high level, so that the output terminal SHIP pin of the charging activation circuit is driven to output high level.

In some embodiments, the wake-up circuit further comprises a DC/DC output control circuit; the DC/DC output control circuit at least comprises a third triode Q3 and a fourth triode Q4, a third base electrode of the third triode Q3 is connected with an output pin MCU SHIP of the micro control unit through a sixth resistor R6, a third emitting electrode of the third triode Q3 is grounded, and a seventh resistor R7 is connected between the third emitting electrode and the third base electrode; a third collector electrode of the third triode Q3 is connected with a fourth base electrode of the fourth triode Q4 through an eighth resistor R8; a fourth emitter of the fourth triode Q4 is connected with the access voltage VBAT, and a ninth resistor R9 is connected between the fourth emitter and the fourth base; and a fourth collector of the fourth triode Q4 is connected with the charging activation circuit.

In some embodiments, after the BMS protection board is powered on, the MCU clip outputs a preset level, i.e., a high level, and the third transistor Q3 is turned on; when the fourth emitter of the fourth transistor Q4 is connected to the switch-in voltage VBAT, and the potential of the fourth emitter is higher than the potential of the fourth base, the fourth transistor Q4 is turned on, so that the DC/DC output control circuit can continuously pull up the output terminal SHIP pin of the charging activation circuit to output a high level, and the DC/DC converter connected to the SHIP pin continuously outputs an output voltage with a preset threshold, for example, 12V.

Fig. 5 is a circuit schematic diagram of a DC/DC control circuit and a DC/DC converter provided in the embodiment of the present application, and as shown in fig. 5, the DC/DC control circuit includes at least a fifth resistor R5 and a first switch Q; the gate G of the first switch Q is connected to the SHIP pin through a fifth resistor R5, the drain D of the first switch Q is connected to the voltage output terminal VBAT _ IN, and the source S of the first switch Q is connected to the positive electrode P + of the charging device. The DC/DC converter includes at least an input pin VIN connected to a voltage output terminal VBAT _ IN of the DC/DC control circuit. The first switch Q is connected with a resistor R in parallel, the resistor R is connected with a voltage stabilizing diode ZD2 in parallel, and the voltage stabilizing diode ZD1 is grounded. When the charging WakeUp terminal CHG WakeUp outputs a high level, the output terminal SHIP of the charging activation circuit connected to the charging WakeUp terminal outputs a high level, the first switch Q of the DC/DC control circuit is turned on, and the DC/DC converter outputs an output voltage having a preset threshold (which may be 12V), so that the BMS protection board is powered on. And when the BMS protection board is powered on, the BMS protection board enters the running state from the dormant state.

In the embodiment of the application, the BMS protection board is activated by charging in the sleep state (i.e., PD mode), and the operation control logic is entered when the BMS protection board system is successfully powered up. Fig. 6 is a schematic diagram of switching states of the BMS protection board according to an embodiment of the present invention, as shown in fig. 6, the logic is formed by switching an operation state 601 (RUN mode) and a standby state 602 (IDLE mode), when the BMS protection board detects a load current or receives a load communication (i.e., a load signal) to determine that the load is in the operation state, the BMS protection board switches to the operation state 601 (RUN mode), the MCU (i.e., the MCU) is operated at full speed, the MOS transistor state is determined by the protection strategy, and the power consumption of the BMS protection board is less than 10 ma hours (mAh). When the load does not work, does not generate current, and is continuously standby for 30 seconds without communication, the state of the BMS protection board is transferred to the standby state 602 (IDLE mode), the IDLE mode automatically turns off unnecessary peripherals, the system clock frequency is reduced to 20KHz from 24MHz, the charging MOS tube and the discharging MOS tube keep the original states, the front-end acquisition chip (namely the front-end acquisition module) enters the dormant state, the power consumption of the BMS protection board is less than 1 milliampere hour (mAh) at the moment, and the BMS protection board enters the standby state 602 (IDLE mode). When the BMS load is opened under the standby state 602, the load is communicated with the BMS, the state of the BMS protection board is transferred to the RUN mode, the MCU controls the MCU _ SHIP pin to be pulled down when the system is under-voltage or needs long-term storage under the RUN mode, so that the BMS enters the sleep mode 603 (PD mode), and the power consumption of the BMS protection board is smaller than 1 microampere hour (uAh).

The multi-stage state conversion strategy of BMS protection shield has ensured the consumption rational distribution of BMS protection shield, has improved the stability and the security of BMS protection shield, has increased whole quick-witted duration, has promoted user experience. The BMS state switching system provided by the embodiment of the application has the advantages of low cost and high reliability, and is beneficial to large-scale popularization.

According to the embodiment of the application, the MOS tube, the charging wake-up circuit, the DCDC output control circuit and other modules are matched with the state conversion strategy of the BMS protection board, so that the effect of reducing the overall operation power consumption is achieved, and the problem of large power consumption of a BMS system in a small lithium battery application scene is solved; and BMS protection board state machine mode and the charging wake-up circuit are used as the system activation mechanism of the sleep state, so that the reliability is enhanced while the whole power consumption is reduced, and the system is easy to develop and maintain. The problem of current small-size lithium batteries such as little energy storage, electricity are rubbed and are traded electricity or electric tool and generally meet the power consumption is solved, the equipment life has been prolonged, the risk of BMS protection shield from power consumption overdischarge has been reduced.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.

Claims

1. A BMS state switching system is characterized by at least comprising a battery, a BMS protection board connected with the battery and a wake-up circuit arranged on the BMS protection board;

the BMS protection board is further configured to determine a battery voltage of the battery, and the BMS protection board enters the sleep state from the operating state or the standby state when the battery voltage is lower than a threshold voltage.

2. The system of claim 1, wherein the BMS protection board comprises at least a micro control unit; the wake-up circuit at least comprises a charging wake-up circuit, a charging activation circuit, a DC/DC control circuit and a DC/DC converter;

3. The system of claim 2, wherein the charge wake-up circuit comprises at least a first transistor and a second transistor;

4. The system according to claim 3, wherein the BMS protection board comprises at least a discharging MOS and a charging MOS connected in series, a source of the discharging MOS is connected to a negative electrode of the battery through a shunt, and a drain of the discharging MOS is connected to a drain of the charging MOS;

when the system is connected to the charging equipment in the dormant state, the discharging MOS and the charging MOS are disconnected, and the first triode is conducted;

5. The system of claim 4, wherein the DC/DC control circuit comprises at least a fifth resistor and a first switch; the grid electrode of the first switch is connected with the output end through a fifth resistor, and the drain electrode of the first switch is connected with the voltage output end; the DC/DC converter at least comprises an input pin, and the input pin is connected with the voltage output end;

6. The system of claim 5, wherein the wake-up circuit further comprises a DC/DC output control circuit;

the DC/DC output control circuit at least comprises a third triode and a fourth triode, and a third base electrode of the third triode is connected with an output pin of the micro-control unit through a sixth resistor; a third emitter of the third triode is grounded, and an eighth resistor is connected between the third emitter and the third base;

7. The system of any one of claims 1 to 6, wherein the BMS protection board comprises at least a micro control unit; the load working signal at least comprises a load current and a load signal;

and the micro control unit is used for controlling the BMS protection board to enter the standby state from the running state when the load current in a preset time period is less than a preset threshold value or no load signal is received in the preset time period.

8. The system of claim 7, wherein the load working signal further comprises a protection signal;

9. The system of any one of claims 1 to 6, wherein the BMS protection board comprises at least a micro control unit and a front end acquisition module connected to each other;

the micro control unit is used to control the BMS protection board to enter the sleep state from the operation state or the standby state when the battery voltage is lower than a threshold voltage.

10. The system of claim 9, wherein when the BMS protection board is in the operational state, both the micro control unit and the front end acquisition module are in an operational state;