BMS power supply system

Abstract

The utility model relates to the technical field of battery application, and discloses a BMS power supply system which comprises a BMS module, a switching module, a main power supply module and a standby power supply module, the output end of the switching module is connected with the BMS module, and the input end of the switching module is connected with the main power supply module and the standby power supply module; wherein the switching module is used for selectively controlling one of the main power supply module and the standby power supply module to be communicated and connected with the BMS module, so that the standby power supply module is communicated and connected with the BMS module under the state of no charging and discharging for a long time. By adopting the design of the main power supply module and the standby power supply module, the standby power supply module is communicated and connected with the BMS module under the state of no charge and discharge for a long time, the electric energy of the battery cells is hardly consumed, the phenomenon of excessive discharge of part of the battery cells is avoided, and the overall performance and the service life of the battery pack are effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery application, and particularly relates to a BMS power supply system. BACKGROUND

[0002] In the field of electronic devices and new energy at present, lithium batteries have been widely used in the field of portable electrical appliances due to their high energy density, long cycle life, low self-discharge rate and other significant performance advantages. In particular, the emergence of lithium iron phosphate material batteries greatly promotes the further development and expansion of the lithium battery industry, and makes the application of lithium batteries in the field of electric vehicle power more popular.

[0003] However, compared with traditional secondary batteries such as lead-acid batteries, nickel-cadmium batteries and nickel-hydrogen batteries, lithium batteries have special safety risks in the charging and discharging process. Due to its unique electrochemical characteristics, if not properly managed during charging and discharging, lithium batteries are prone to lose control of electrochemical characteristics, and may even cause serious consequences such as battery burning. Therefore, in the use process of lithium batteries, a battery management system (BMS) is needed to monitor and effectively protect them in real time, so as to prevent the occurrence of overcharge, overdischarge, overtemperature, overcurrent and short circuit and other faults, so as to effectively improve the safety performance of lithium battery products and prolong their service life.

[0004] At present, in the field of BMS power supply, the main power supply methods mainly include battery cell power supply and external power supply. However, both of these two power supply methods have certain disadvantages. When battery cell power supply is adopted, if the control strategy is improper, it may cause some battery cells to be overdischarged, and thus the voltage is extremely low or even scrapped, which seriously affects the overall performance and service life of the battery pack. CONTENT OF THE INVENTION

[0005] In order to solve the deficiencies of the prior art, the application provides a BMS power supply system, which is designed by adopting a main power supply module and a backup power supply module. In the state of no charging and discharging for a long time, the backup power supply module is connected with the BMS module, almost no battery cell power is consumed, the phenomenon of overdischarge of some battery cells is avoided, and the overall performance and service life of the battery pack are effectively provided.

[0006] The technical effects achieved by the application are realized through the following aspects:

[0007] The application provides a BMS power supply system, which comprises a BMS module, a switching module, a main power supply module and a backup power supply module. The output end of the switching module is connected with the BMS module, and the input end of the switching module is connected with the main power supply module and the backup power supply module respectively.

[0008] The switching module is configured to selectively connect the main power supply module or the backup power supply module to the BMS module, so that the backup power supply module is connected to the BMS module in a long-time non-charging and non-discharging state.

[0009] In some implementations, the switching module includes a transistor Q2, a first input unit, a second input unit, and an output terminal 3V3.

[0010] The first input unit is connected between the backup power supply module and the drain of the transistor Q2, and the second input unit is connected between the main power supply module and the source of the transistor Q2, and is connected to the output terminal 3V3.

[0011] In some implementations, the main power supply module includes a first control unit, a second control unit, a DC / DC unit, and a power supply unit, the first control unit and the second control unit are respectively connected to the input terminal of the DC / DC unit, and the output terminal of the DC / DC unit is connected to the input terminal of the power supply unit.

[0012] In some implementations, the BMS module includes a charging wake-up unit and a BMS unit, the BMS unit is connected to the charging wake-up unit and the switching module.

[0013] In some implementations, the first control unit includes an external power supply terminal P+, a control signal terminal DRY1, a relay K2, a transistor Q3, and a power supply terminal +12V1.

[0014] The control signal terminal DRY1 is connected to the gate of the transistor Q3, and the source of the transistor Q3 is grounded.

[0015] The coil of the relay K2 is connected between the power supply terminal +12V1 and the drain of the transistor Q3.

[0016] The normally open contact of the relay K2 is connected between the external power supply terminal P+ and the DC / DC unit.

[0017] In some implementations, the second control unit includes a battery power supply terminal B+, a control signal terminal DRY2, a relay K1, a transistor Q4, and a power supply terminal +12V2.

[0018] The control signal terminal DRY2 is connected to the gate of the transistor Q4, and the source of the transistor Q4 is grounded.

[0019] The coil of the relay K1 is connected between the power supply terminal +12V2 and the drain of the transistor Q4.

[0020] The normally open contact of the relay K1 is connected between the battery power supply end B+ and the DC / DC unit.

[0021] In some implementations, the charging wake-up unit comprises:

[0022] a voltage dividing unit comprising an external power supply end P+, an external power supply end P-, and at least two series resistors connected between the external power supply end P+ and the external power supply end P-;

[0023] a power supply end 3V3;

[0024] a wake-up signal end PA0 for connecting a pin of a control circuit and outputting a wake-up signal;

[0025] an optocoupler U1, one end of which is connected to the voltage dividing unit and the other end of which is connected to a transistor Q1;

[0026] the transistor Q1, a gate of which is connected to the optocoupler U1, a drain of which is connected to the power supply end 3V3, and a source of which is connected to the wake-up signal end PA0;

[0027] a diode D1 connected between the source of the transistor Q1 and the wake-up signal end PA0.

[0028] In some implementations, the first input unit comprises an input end VBAT connected between the backup power supply module and an anode of a diode D2, and a cathode of the diode D2 is connected to a drain of the transistor Q2.

[0029] In some implementations, the second input unit comprises an input end VCC connected between the main power supply module and an anode of a diode D3, a cathode of the diode D3 is connected to the output end 3V3, and a gate of the transistor Q2 is connected to the input end VCC through a resistor R6.

[0030] In some implementations, the power control and monitoring module further comprises a pre-charge unit, a current monitoring unit, an external power supply end P+, an external power supply end P-, a battery power supply end B+, and a battery power supply end B-.

[0031] The pre-charge unit comprises a main relay K3, a pre-charge relay K4, and a pre-charge resistor R8, the battery power supply end B+ and the external power supply end P+ are connected to the main relay K3, and the main relay K3 is connected in parallel with a branch comprising the pre-charge relay K4 and the pre-charge resistor R8 in series.

[0032] The current monitoring unit comprises a shunt RS, which is connected in series between the battery supply end B- and the external supply end P-.

[0033] In summary, the present application has at least the following advantages:

[0034] The BMS power supply system provided by the present application, by adopting the main power supply module or the standby power supply module, in the state of charging and discharging, the main power supply module supplies power for the BMS module; in the state of long time no charging and discharging, the BMS module enters the sleep mode, and the standby power supply module supplies power for the BMS module; the main power supply module realizes that the battery cell almost does not consume electric energy, thereby avoiding the phenomenon that some battery cells are over-discharged, effectively improving the overall performance and service life of the battery pack, improving the safety of the battery system, and enhancing the stability and reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structure schematic diagram of the BMS power supply system in the embodiment 1 of the present application.

[0036] Figure 2 It is a structure schematic diagram of the BMS power supply system in the embodiment 2 of the present application.

[0037] Figure 3 It is a structure schematic diagram of the switching module in the embodiment 2 of the present application.

[0038] Figure 4 It is a structure schematic diagram of the first control unit in the embodiment 2 of the present application.

[0039] Figure 5 It is a structure schematic diagram of the second control unit in the embodiment 2 of the present application.

[0040] Figure 6 It is a structure schematic diagram of the DC / DC unit in the embodiment 2 of the present application.

[0041] Figure 7 It is a structure schematic diagram of the power supply unit in the embodiment 2 of the present application.

[0042] Figure 8 It is a structure schematic diagram of the charging wake-up unit in the embodiment 2 of the present application.

[0043] Figure 9 It is a structure schematic diagram of the power control and monitoring module in the embodiment 2 of the present application.

[0044] Figure 10 It is a control logic diagram of the BMS power supply system in the embodiment 2 of the present application.

[0045] Figure 11 It is a structure schematic diagram of the electric vehicle in the embodiment 3 of the present application.

[0046] Figure 12 The structure schematic diagram of the charging pile in the embodiment 3 of the present application.

[0047] The marks in the figure are:

[0048] 1, BMS module, 11, charging wake-up unit, 111, voltage dividing unit, 12, BMS unit; 2, switching module, 21, first input unit, 22, second input unit; 3, main power supply module, 31, first control unit, 32, second control unit, 33, DC / DC unit, 34, power supply unit; 4, standby power supply module; 5, power control and monitoring module, 51, pre-charging unit, 52, current monitoring unit;

[0049] 100, BMS power supply system; 200, electric vehicle; 300, charging pile. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, but not all the embodiments of the present application.

[0051] Therefore, the detailed description of the embodiments of the present application provided below in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0052] Embodiment 1:

[0053] Please refer to the drawings Figure 1 The BMS power supply system of the present application comprises a BMS module 1, a switching module 2, a main power supply module 3 and a standby power supply module 4. The output end of the switching module 2 is connected with the BMS module 1, and the input end of the switching module 2 is connected with the main power supply module 3 and the standby power supply module 4 respectively. The switching module 2 is used to selectively control the main power supply module 3 or the standby power supply module 4 to be connected with the BMS module 1, so that the standby power supply module 4 is connected with the BMS module 1 in the long-time non-charging and non-discharging state.

[0054] The main power supply module 3 comprises external power charging and cell charging, which ensures the stable work of the BMS module 1.

[0055] The standby power supply module 4 is preferably a lithium sub-battery, and the power consumption is 40uA. When the BMS module 1 enters the sleep mode, the lithium sub-battery consumes 40uA, and the cell consumes only 2uA, so the cell can be effectively protected from over-discharge and permanent damage, and the service life of the cell is improved.

[0056] In the BMS power supply system 100 in this embodiment, the switching module 2 controls the main power supply module 3 to charge the BMS module 1 in the state of charging and discharging, and the BMS module 1 enters the sleep mode in the state of long-time no charging and discharging, and the switching module 2 controls the standby power supply module 4 to charge the BMS module 1. Since the lithium sub-battery consumes 40uA, and the cell in the main power supply module 3 consumes only 2uA, the cell almost does not consume power, avoiding the phenomenon of over-discharge of part of the cells, effectively protecting the cells from over-discharge and permanent damage, improving the overall performance and service life of the battery pack, improving the safety of the battery system, and enhancing the stability and reliability of the system.

[0057] Embodiment 2:

[0058] The difference between this embodiment and embodiment 1 is that, as shown in Figures 2-3 The switching module 2 of this embodiment includes a transistor Q2, a first input unit 21, a second input unit 22, and an output terminal 3V3. The first input unit 21 is connected between the standby power supply module 4 and the drain of the transistor Q2. The second input unit 22 is connected between the main power supply module 3 and the source of the transistor Q2, and is connected with the output terminal 3V3.

[0059] Specifically, the first input unit 21 includes an input terminal VBAT and a diode D2, the input terminal VBAT is connected between the standby power supply module 4 and the anode of the diode D2, and the cathode of the diode D2 is connected with the drain of the transistor Q2.

[0060] The second input unit 22 includes an input terminal VCC, a diode D3, and a resistor R6, the input terminal VCC is connected between the main power supply module 3 and the anode of the diode D3, the cathode of the diode D3 is connected with the output terminal 3V3, and the gate of the transistor Q2 is connected with the input terminal VCC through the resistor R6. Among them, the resistor R6 may play a role of current limiting, etc., to ensure that the current in the circuit is in a suitable range, and to ensure stable operation of the circuit.

[0061] When the input terminal VBAT is connected and the voltage is higher than the input terminal VCC, the diode D2 is forward-biased, and the current flows from the input terminal VBAT to the drain of the transistor Q2 through the diode D2. At this time, the gate voltage of the transistor Q2 is higher than the source voltage of the transistor Q2, the transistor Q2 is turned on, the current flows from the drain to the source of the transistor Q2, and the 3V3 voltage is output after passing through the diode D3 and the output terminal 3V3, to supply power to the load.

[0062] Because of the existence of diode D3, the input end VCC power supply is prevented from flowing back to the input end VBAT power supply direction; meanwhile, diode D2 prevents the input end VCC power supply from affecting the transistor Q2 drain, so that the input end VBAT power supply preferentially supplies power to the load.

[0063] When the input end VCC power supply voltage is higher than the input end VBAT power supply voltage, diode D3 is forward- conducting, and current flows from the input end VCC to output 3V3 voltage for the load.

[0064] At this time, diode D2 is reverse-biased and cut off, preventing the input end VCC power supply current from flowing to the input end VBAT power supply; meanwhile, because the voltage between the gate and the source of the transistor Q2 is not enough to make the transistor Q2 conduct, that is, the transistor Q2 is cut off, the input end VBAT power supply is disconnected from the output end 3V3, and the input end VCC power supply preferentially supplies power to the load.

[0065] Through the above-mentioned switching module 2 setting, the system can be flexibly switched to the main power supply module 3 and the standby power supply module 4 for the BMS module 1 under different conditions, and the system can still stably obtain 3V3 power supply under different power supply states. Because diode D2 and diode D3 have unidirectional conductivity, they can prevent the power supply from being reversed, thereby protecting the circuit. At the same time, they can also avoid mutual interference between different power supplies when the power supply is switched.

[0066] In some embodiments, referring to Figures 4-5 , the main power supply module 3 includes a first control unit 31, a second control unit 32, a DC / DC unit 33, and a power supply unit 34, the first control unit 31 and the second control unit 32 are respectively connected with the input end of the DC / DC unit 33, and the output end of the DC / DC unit 33 is connected with the input end of the power supply unit 34. Among them, the first control unit 31 is used to control the conduction or cut-off of the external power supply for supplying power to the BMS module 1. The second control unit 32 is used to control the conduction or cut-off of the battery cell for supplying power to the BMS module 1.

[0067] In the embodiment, the main power supply module 3 uses the first control unit 31 to control the cut-off or conduction of the external power supply and the DC / DC unit 33, and the second control unit 32 controls the cut-off or conduction of the battery cell and the DC / DC unit 33, and the current flows to the power supply unit 34 through the DC / DC unit 33, and the power supply unit 34 flows to the BMS module 1 through the switching module 2. In this circuit, the power supply or signal transmission control connected to the related circuit of the DC / DC unit 33 is realized.

[0068] Specifically, the first control unit 31 comprises an external power supply end P+, a control signal end DRY1, a relay K2, a transistor Q3 and a power supply end +12V1; the control signal end DRY1 is connected with the gate of the transistor Q3, and the source of the transistor Q3 is grounded; the coil of the relay K2 is connected between the power supply end +12V1 and the drain of the transistor Q3; and the normally open contact of the relay K2 is connected between the external power supply end P+ and the DC / DC unit 33.

[0069] When the control signal end DRY1 has a high-level control signal input, the first control unit 31 in the embodiment has current flowing into the gate of the transistor Q3, so that the transistor Q3 is turned on. After being turned on, the power supply of the power supply end +12V1 supplies power to the coil of the relay K2 through the drain-source of the transistor Q3, and the contact of the relay K2 is closed. At this time, current can flow from the external power supply end P+ to the DC / DC unit 33, so as to realize the on-off control of the external circuit.

[0070] When the control signal end DRY1 outputs a low-level signal, the gate potential of the transistor Q3 is pulled down to the ground, and the transistor Q3 is cut off. No current passes through the coil of the relay K2, the contact of the relay K2 is disconnected, and the external power supply end P+ is disconnected from the DC / DC unit 33.

[0071] The second control unit 32 comprises a battery power supply end B+, a control signal end DRY2, a relay K1, a transistor Q4 and a power supply end +12V2; the control signal end DRY2 is connected with the gate of the transistor Q4, and the source of the transistor Q4 is grounded; the coil of the relay K1 is connected between the power supply end +12V2 and the drain of the transistor Q4; and the normally open contact of the relay K1 is connected between the battery power supply end B+ and the DC / DC unit 33.

[0072] When the control signal end DRY2 has a high-level control signal input, the second control unit 32 in the embodiment has current flowing into the gate of the transistor Q4, so that the transistor Q4 is turned on. After being turned on, the power supply of the power supply end +12V2 supplies power to the coil of the relay K1 through the drain-source of the transistor Q4, and the contact of the relay K1 is closed. Current flows from the battery power supply end B+ to the DC / DC unit 33, so as to realize the on-off control of the other power supply.

[0073] When the control signal end DRY1 outputs a low-level signal, the gate potential of the transistor Q4 is pulled down to the ground, and the transistor Q4 is cut off.

[0074] Through the above-mentioned first control unit 31 and second control unit 32, the main power supply module 3 can flexibly control the on-off of the external power supply or the power supply and the DC / DC unit 33, and the control precision is high.

[0075] In addition, please refer to Figure 6, the DC / DC unit 33 includes a power conversion unit Ua1, the Vi+ pin of which is connected to DC+, the Vi- pin of which is connected to P-, the +Vo pin of which is connected to +12V, and the 0V pin of which is grounded. Through this setting, the input DC voltage is converted into a specific output DC voltage, which is converted from the DC+ and P- input to +12V to meet the power supply voltage requirement of the subsequent circuit and ensure the normal operation of these circuits.

[0076] Please refer to Figure 7 , the power supply unit 34 includes a voltage conversion chip U2, capacitors C1, C2, C3 and C4, the Vin pin of the voltage conversion chip U2 is connected to +12V, the GND pin of the voltage conversion chip U2 is grounded, and the Vout pin of the voltage conversion chip U2 is connected to VCC; the capacitors C1 and C2 are connected in parallel, one end of which is connected to VCC and the other end of which is grounded; the capacitors C3 and C4 are connected in parallel, one end of which is connected to +12V and the other end of which is grounded. Through this setting, voltage conversion and power filtering can be achieved, the input +12V voltage is converted into a stable VCC voltage output, and a stable power supply voltage is provided for the subsequent circuit. And by setting the capacitors, high-frequency noise and ripple in the power supply can be removed, making the input and output voltages more smooth and stable.

[0077] In some embodiments, please refer to Figure 8 , the BMS module 1 includes a charging wake-up unit 11 and a BMS unit 12, the BMS unit 12 is connected to the charging wake-up unit 11 and the switching module 2. Through this setting, when the charger is connected, the charging wake-up unit 11 transmits a wake-up signal to the BMS unit 12, so that the BMS unit 12 is woken up by charging, and the system is switched to be powered by the main power supply module 3. The multi-path power supply of the BMS unit 12 can avoid the phenomenon of over-discharge of part of the battery cells, effectively improve the overall performance and service life of the battery pack,

[0078] Specifically, the charging wake-up unit 11 includes a voltage dividing unit 111, a power supply end 3V3, a wake-up signal end PA0, an optocoupler U1 and a transistor Q1: the voltage dividing unit 111 includes an external power supply end P+, an external power supply end P- and at least two series resistors connected between the external power supply end P+ and the external power supply end P-; the wake-up signal end PA0 is used to connect the pin of the control circuit and output a wake-up signal; one end of the optocoupler U1 is connected to the voltage dividing unit 111, and the other end is connected to the transistor Q1; the gate of the transistor Q1 is connected to the optocoupler U1, the drain of the transistor Q1 is connected to the power supply end 3V3, and the source of the transistor Q1 is connected to the wake-up signal end PA0; the diode D1 is connected between the source of the transistor Q1 and the wake-up signal end PA0.

[0079] With the above charging wake-up unit 11, when the external charging power supply is connected to the external power supply end P+ and the external power supply end P-, the voltage of the external power supply end P+ is divided by the series resistance, and a voltage is generated. The voltage makes the light-emitting diode inside the optocoupler U1 conduct light, and then makes the phototransistor conduct.

[0080] After the optocoupler U1 is turned on, the 4-pin potential of the optocoupler U1 is pulled low, and due to the one-way conductivity of the diode D4, this low-level signal does not affect other parts. At this time, the power supply of the power supply end 3V3 is divided by the voltage dividing unit 111, and then provides a suitable voltage to the gate of the transistor Q1, so that the transistor Q1 is turned on.

[0081] After the transistor Q1 is turned on, the current flows from the power supply end 3V3 through the transistor Q1 and the diode D1 to the wake-up signal end PA0, so that the pin potential of the wake-up signal end PA0 is raised, a high-level wake-up signal is generated, and sent to the microcontroller or other control circuit, to inform the system that the charging power supply is connected, and the system can enter the charging related operation or wake up the corresponding function module, to realize the wake-up of the BMS unit 12.

[0082] With the above charging wake-up unit 11, the circuit wake-up function under the trigger of a specific signal is realized.

[0083] In some embodiments, please refer to Figure 9 It also includes a power control and monitoring module 5, which includes a pre-charge unit 51, a current monitoring unit 52, an external power supply end P+, an external power supply end P-, a battery power supply end B+, and a battery power supply end B-.

[0084] The pre-charge unit 51 includes a main relay K3, a pre-charge relay K4, and a pre-charge resistor R8. The battery power supply end B+ is connected with the external power supply end P+ through the main relay K3, and the main relay K3 is connected in parallel with a branch formed by the pre-charge relay K4 and the pre-charge resistor R8.

[0085] The current monitoring unit 52 includes a shunt RS connected in series between the battery power supply end B- and the external power supply end P-.

[0086] The power control and monitoring module 5 in this embodiment, when the system starts, the main relay K3 is in an open state, and the pre-charge relay K4 is closed. The battery pack charges the capacitive load in the external circuit through the pre-charge resistor R8. Due to the existence of the pre-charge resistor R8, the charging current is limited within a safe range, avoiding the impact of instantaneous large current on the circuit. As the voltage across the capacitive load gradually rises, when it reaches a certain level, it approaches the voltage of the battery pack, and the pre-charge process is completed.

[0087] After the pre-charge is completed, the main relay K3 is closed, and the pre-charge relay K4 can be disconnected at this time. The battery pack is directly connected with the external circuit through the main relay K3 to provide power for the load, and the system enters a normal working state, thereby realizing the main circuit connection. The charging safety can be ensured, and the damage of the relay, the battery and other circuit elements caused by the large current impact due to the instantaneous charging of the load side capacitor when the main relay is directly closed can be avoided.

[0088] In the process that the battery pack supplies power to the load, the current flows through the shunt RS. Since the shunt RS has a certain resistance value, according to Ohm's law, a voltage drop proportional to the current is generated across the shunt RS. By measuring this voltage drop and through the corresponding signal processing circuit, the current size output by the battery pack can be monitored in real time, and the current data is provided for the BMS unit 12 and the like, so that the overcurrent protection, the power calculation and other control operations are performed, and the safe and efficient operation of the battery system is ensured.

[0089] The power supply control process of the BMS power supply system in the embodiment is as follows: please refer to Figure 10 When the charger is connected, the BMS unit is awakened by the charging awakening unit, switched to external power supply, that is, the first control unit is turned on; if there is no external input, the BMS unit is switched to the power supply of the battery cell, that is, the second control unit is turned on; if there is no charging for a long time, the power supply of the battery cell is disconnected, and the BMS unit is in sleep mode, and the standby power supply module supplies power to the BMS unit. The battery cell consumes almost no power, effectively protects the battery cell from permanent damage caused by over-discharge, and prolongs the service life of the battery cell.

[0090] Embodiment 3:

[0091] The embodiment is based on the above-mentioned embodiments, please refer to Figure 11 , and provides an electric vehicle 200 comprising the above-mentioned BMS power supply system 100.

[0092] The electric vehicle 200 in the embodiment can prolong the overall service life of the battery and reduce the use cost of the vehicle by accurately controlling the charging and discharging process of the battery, dynamically adjusting the charging current and voltage at appropriate times, and avoiding excessive consumption of the battery. At the same time, the voltage, current, temperature and other parameters of the battery can be monitored in real time to prevent overcharging, over-discharging, overvoltage, overcurrent, and over-temperature of the battery, effectively avoid the performance degradation, service life shortening and even safety accidents such as fire and explosion of the battery caused by these abnormal conditions, and ensure the safe operation of the electric vehicle 200.

[0093] Embodiment 4:

[0094] The embodiment is based on the above-mentioned embodiments, please refer to Figure 12 , and provides a charging pile 300 comprising the above-mentioned BMS power supply system 100.

[0095] The charging pile 300 in the embodiment monitors the energy output of the charging pile 300, controls the charging switch state, and timely feeds back the state information in the charging process, so as to prevent overcharging and other safety problems of the battery in the charging process, avoid fire and other safety accidents caused by charging, and ensure the safety of the charging pile 300 and the electric vehicle 200.

[0096] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connect", "fix" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0097] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0098] In addition, the terms "horizontal", "vertical", "suspension" and the like do not mean that the parts must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0099] In the present application, unless specifically defined and limited otherwise, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0100] While the application has been described in connection with the specific embodiments thereof, it will be understood that many modifications, substitutions and changes can be made by those skilled in the art without departing from the spirit and scope of the application. Accordingly, all such modifications, substitutions and changes are intended to be included within the scope of the appended claims.

Claims

1. A BMS power supply system, characterized by, The BMS module, the switching module, the main power supply module and the standby power supply module are included, the output end of the switching module is connected with the BMS module, and the input end of the switching module is connected with the main power supply module and the standby power supply module respectively; The switching module is used for selectively controlling the main power supply module or the standby power supply module to be connected with the BMS module, so that the standby power supply module is connected with the BMS module in the state of long time without charging and discharging.

2. The BMS power supply system of claim 1, wherein, The switching module includes a transistor Q2, a first input unit, a second input unit and an output end 3V3; The first input unit is connected between the standby power supply module and the drain of the transistor Q2, and the second input unit is connected between the main power supply module and the source of the transistor Q2 and connected with the output end 3V3.

3. The BMS power supply system of claim 1, wherein, The main power supply module includes a first control unit, a second control unit, a DC / DC unit and a power supply unit, the first control unit and the second control unit are connected with the input end of the DC / DC unit respectively, and the output end of the DC / DC unit is connected with the input end of the power supply unit.

4. The BMS power supply system of claim 1, wherein, The BMS module includes a charging wake-up unit and a BMS unit, the BMS unit is connected with the charging wake-up unit and the switching module.

5. The BMS power supply system of claim 3, wherein, The first control unit includes an external power supply end P+, a control signal end DRY1, a relay K2, a transistor Q3 and a power supply end +12V1; The control signal end DRY1 is connected with the gate of the transistor Q3, and the source of the transistor Q3 is grounded; The coil of the relay K2 is connected between the power supply end +12V1 and the drain of the transistor Q3; The normally open contact of the relay K2 is connected between the external power supply end P+ and the DC / DC unit.

6. The BMS power supply system of claim 3, wherein, The second control unit includes a battery power supply end B+, a control signal end DRY2, a relay K1, a transistor Q4 and a power supply end +12V2; The control signal end DRY2 is connected with the gate of the transistor Q4, and the source of the transistor Q4 is grounded; The coil of the relay K1 is connected between the power supply end +12V2 and the drain of the transistor Q4; The normally open contact of the relay K1 is connected between the battery power supply end B+ and the DC / DC unit.

7. The BMS powered system of claim 4, wherein, The charging wake-up unit includes: A voltage dividing unit including an external power supply end P+, an external power supply end P- and at least two series resistors connected between the external power supply end P+ and the external power supply end P-; A power supply end 3V3; A wake-up signal end PA0 for connecting the pin of a control circuit and outputting a wake-up signal; An optical coupler U1, one end of which is connected with the voltage dividing unit and the other end of which is connected with a transistor Q1; The transistor Q1, the gate of which is connected with the optical coupler U1, the drain of which is connected with the power supply end 3V3, and the source of which is connected with the wake-up signal end PA0; A diode D1 connected between the source of the transistor Q1 and the wake-up signal end PA0.

8. The BMS powered system of claim 2, wherein, The first input unit comprises an input terminal VBAT connected between the backup power supply module and the anode of a diode D2, and the cathode of the diode D2 is connected to the drain of the transistor Q2.

9. The BMS powered system of claim 2, wherein, The second input unit comprises an input terminal VCC connected between the main power supply module and the anode of a diode D3, the cathode of the diode D3 is connected to the output terminal 3V3, and the gate of the transistor Q2 is connected to the input terminal VCC through a resistor R6.

10. The BMS powered system of claim 1, wherein, The power control and monitoring module comprises a pre-charge unit, a current monitoring unit, an external power supply terminal P+, an external power supply terminal P-, a battery power supply terminal B+, and a battery power supply terminal B-. The pre-charge unit comprises a main relay K3, a pre-charge relay K4, and a pre-charge resistor R8, the battery power supply terminal B+ and the external power supply terminal P+ are connected to the main relay K3, and the main relay K3 is connected in parallel with a branch comprising the pre-charge relay K4 and the pre-charge resistor R8 in series. The current monitoring unit comprises a shunt RS connected in series between the battery power supply terminal B- and the external power supply terminal P-.

Images