CN220307003U - BMS power supply circuit of emergency power supply system - Google Patents
BMS power supply circuit of emergency power supply system Download PDFInfo
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- CN220307003U CN220307003U CN202321976991.8U CN202321976991U CN220307003U CN 220307003 U CN220307003 U CN 220307003U CN 202321976991 U CN202321976991 U CN 202321976991U CN 220307003 U CN220307003 U CN 220307003U
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Abstract
The application provides a BMS powered circuit of emergency power supply system, the circuit includes: the battery management system comprises an emergency power supply, a first direct current-direct current conversion DC/DC1 module, a battery management system BMS module and a charging switch KM1; one end of the charging switch KM1 is used as a charging input end and is connected with the positive end of an external charging machine, the other end of the charging switch KM is connected with the positive end of an emergency power supply, and the negative end of the external charging machine is connected with the negative end of the emergency power supply; the input of DC/DC1 module is connected with the input that charges, and the output of DC/DC1 module is connected with the power input of BMS module, and the output control end of BMS module is connected with the control end of charging switch KM1, and the switching of charging switch KM1 is controlled to the BMS module after the power-on. This application gets electricity through the multichannel and makes BMS's mode of going up more reliable and more stable, has avoided only getting the unicity and the inconvenience that the electricity led to from emergency power source, has increased emergency power source system's reliability.
Description
Technical Field
The application belongs to the technical field of electric automobiles, and particularly relates to a BMS power supply circuit of an emergency power supply system.
Background
In the field of vehicle emergency power sources, in case of an emergency failure of a vehicle main power source system, an external emergency power source system is required to supply power in order to ensure that an electric vehicle can continue to be used. In general, a direct current power supply obtained from an emergency power supply needs to be converted into a direct current voltage required by a Battery Management System (BMS) in an emergency power supply system through a DC/DC direct current-direct current converter or a voltage reduction circuit, and then the direct current voltage is input to a power input end of the BMS to supply power to the BMS, and the BMS can control the emergency power supply to supply power to a load after being electrified.
In order to reduce power consumption, an emergency power switch is generally added at the input end of the DC/DC or step-down circuit, the emergency power switch is not closed, and the BMS is not electrified. This design may cause inconvenience in the following cases:
case one: when the emergency power supply system is connected with the external charger for charging, after the BMS is electrified by closing the emergency power supply switch, the BMS can control the contactor between the external charger and the emergency power supply to be closed when no abnormal condition is detected, so that the external charger charges the emergency power supply;
and a second case: when the emergency power supply system is placed for a long time or is placed for a long time to cause serious power shortage of the emergency power supply, the emergency power supply switch cannot power on the BMS, so that a user cannot judge the state of the emergency power supply system based on the BMS.
Content of the application
The utility model aims at providing a circuit of emergency power source system's BMS power supply makes BMS's power up mode more reliable and more stable through the multichannel get electricity, has avoided only getting singleness and the inconvenience that the electricity led to from emergency power source, has increased emergency power source system's reliability.
The application provides a circuit of emergency power source system's BMS power supply, emergency power source system's BMS power supply circuit includes: the battery management system comprises an emergency power supply, a first direct current-direct current conversion DC/DC1 module, a battery management system BMS module and a charging switch KM1;
one end of the charging switch KM1 is used as a charging input end and is connected with the positive end of an external charging machine, the other end of the charging switch KM is connected with the positive end of an emergency power supply, and the negative end of the external charging machine is connected with the negative end of the emergency power supply;
the input of DC/DC1 module is connected with the input that charges, and the output of DC/DC1 module is connected with the power input of BMS module, and the output control end of BMS module is connected with the control end of charging switch KM1, and the switching of charging switch KM1 is controlled to the BMS module after the power-on.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a first diode D1, wherein a positive electrode of the first diode D1 is connected with a positive electrode end of the emergency power supply, and a negative electrode of the first diode D1 is connected with an input end of the DC/DC1 module after being connected with the emergency power supply switch KN1 in series.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a second diode D2, an anode of the second diode D2 is connected to the charging input terminal, and a cathode of the second diode D2 is connected to the input terminal of the DC/DC1 module.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a discharge switch KM2, one end of the discharge switch KM2 is used as a discharge output end to be connected with the positive end of the load, the other end of the discharge switch KM is connected with the positive end of the emergency power supply, and the negative end of the load is connected with the negative end of the emergency power supply;
the input end of the DC/DC1 module is connected with the discharge output end, the output control end of the BMS module is connected with the control end of the discharge switch KM2, and the BMS module is electrified to control the opening and closing of the discharge switch KM 2.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a third diode D3, an anode of the third diode D3 is connected to the discharge output end, and a cathode of the third diode D3 is connected to the input end of the DC/DC1 module.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a capacitor set and a second DC-DC conversion DC/DC2 module;
the capacitor bank is connected with the emergency power supply in parallel, and the voltage output by the emergency power supply is converted into the voltage for charging the capacitor bank through the DC/DC2 module.
Optionally, the BMS power supply circuit of the emergency power supply system further includes a fourth diode D4, an anode of the fourth diode D4 is connected with an anode end of the capacitor bank, and a cathode of the fourth diode D4 is connected with an input end of the DC/DC1 module after being connected with the emergency power switch KN1 in series.
Optionally, the emergency power supply is a battery pack.
Optionally, the charging switch KM1 and the discharging switch KM2 are electric control switches, and the emergency power switch KN1 is a mechanical switch.
In a second aspect, the present application provides an emergency system comprising a charger, an emergency power supply system having a circuit as described in the first aspect, and a load;
when an emergency power supply in the emergency power supply system needs to be charged, the charger is connected to the emergency power supply system; the charging machine supplies power to the BMS module through the charging input end, and after the BMS module is electrified, the charging switch KM1 is controlled to be closed when the circuit is detected to be abnormal, so that the charging machine charges the emergency power supply;
when an emergency power supply in the emergency power supply system needs to supply power to a load, the load is connected into the emergency power supply system; the load supplies power to the BMS module through the discharging output end, and when the BMS module detects that a circuit is not abnormal after power-on, the discharging switch KM2 is controlled to be closed so that the emergency power supply charges the load.
The technical scheme provided by the embodiment of the application at least brings the following beneficial effects:
the utility model provides a circuit of emergency power source system's BMS power supply, multichannel electricity of getting makes BMS power supply more reliable and stable, when connecting special charger charge or connect load such as vehicle lead acid battery discharge, need not to open emergency power switch, and the operation is more convenient, simultaneously, has avoided when emergency power source because put or place for a long time and lead to the serious battery to lack the electricity, can't go up through emergency power switch, makes the condition of the unable judgement emergency power source state of user.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings that are described below are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a BMS power supply circuit of an emergency power supply system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a BMS power supply circuit of the emergency power supply system according to the second embodiment of the present application;
fig. 3 is a schematic diagram of a BMS power supply circuit of the emergency power supply system according to the third embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Wherein the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
An embodiment of the present application provides a BMS power supply circuit of an emergency power supply system, as shown in fig. 1, the BMS power supply circuit of the emergency power supply system includes: the battery management system comprises an emergency power supply, a first direct current-direct current conversion DC/DC1 module, a battery management system BMS module and a charging switch KM1;
optionally, in one or more embodiments, the emergency power source is a battery pack, or other devices that can implement a charging function and a discharging function, which is not limited in this application.
Referring to fig. 1, it can be known that in the present application, one end of a charging switch KM1 is used as a charging input end and is connected with an anode end of an external charging machine, the other end of the charging switch KM1 is connected with an anode end of an emergency power supply, and a cathode end of the external charging machine is connected with a cathode end of the emergency power supply; as can be seen from fig. 1, when an emergency power supply in the emergency power supply system needs to be charged, after the charger is connected to the emergency power supply system, if the charging switch KM1 is in an off state, the external charger cannot charge the emergency power supply, and after the charging switch KM1 is closed, the external charger and the emergency power supply form a closed charging circuit, so that the external charger charges the emergency power supply.
In this embodiment, the functions of the BMS module include voltage detection, current measurement, temperature measurement, switching control, fault information processing and the like of the emergency power supply system and the emergency power supply, and the total voltage of the emergency power supply is higher than the power supply voltage required by the BMS module, so that the voltage output by the emergency power supply needs to be converted into the voltage for supplying power to the BMS module through the DC-DC conversion DC/DC1 module or the step-down circuit, and the voltage output by the emergency power supply is converted into the 12V or 5V or 3.3V DC voltage through the DC-DC conversion DC/DC1 module and then is input to the power supply input end of the BMS module.
In this embodiment, when the emergency power switch KN1 is pressed and closed, the emergency power and the DC/DC1 module form a closed loop, and the voltage output by the emergency power is converted into the voltage for supplying power to the BMS module by the DC/DC1 module.
In this embodiment, emergency power switch KN1 is mechanical switch, when emergency power system does not use for a long time, makes emergency power switch KN1 disconnection in order to practice thrift the consumption, and BMS module outage does not work, and the reclosing emergency power switch KN1 of emergency power system is started in needs, for the BMS module power on.
Referring to fig. 1 again, it can be known that in the present application, the input end of the DC/DC1 module is connected with the charging input end, the output end of the DC/DC1 module is connected with the power input end of the BMS module, the output control end of the BMS module is connected with the control end of the charging switch KM1, and the BMS module is electrified to control the opening and closing of the charging switch KM 1. Therefore, when the emergency power supply in the emergency power supply system needs to be charged, the battery charger is connected to the emergency power supply system, the BMS module can directly take electricity from the charging input end and control the opening and closing of the charging switch KM1 after the electricity is supplied, the emergency power supply switch KN1 is not required to be closed to supply electricity to the BMS module, and the battery charger is more convenient and quick, and meanwhile, inconvenience caused by the fact that the emergency power supply cannot be reused for supplying electricity to the BMS module when the emergency power supply is seriously consumed due to overdischarge or long-term placement is avoided.
In one or more embodiments, the circuit further includes a first diode D1, where the positive pole of the first diode D1 is connected to the positive terminal of the emergency power supply, and the negative pole is connected to the input terminal of the DC/DC1 module after being connected in series to the emergency power switch KN 1.
As a possible embodiment, when the emergency power switch KN1 is pressed to be closed, the first diode D1 is turned on, and the voltage output by the emergency power is converted into a voltage for supplying power to the BMS module through the DC/DC1 module.
In one or more embodiments, the circuit further includes a second diode D2, the anode of the second diode D2 being connected to the charging input terminal and the cathode being connected to the input terminal of the DC/DC1 module.
As a feasible implementation mode, when the external charging machine charges the emergency power supply system, the second diode D2 is conducted, the voltage output by the charging input end is directly converted into the voltage for supplying power to the BMS module through the DC/DC1 module, and after the BMS module is electrified, the charging switch KM1 is controlled to be closed when no abnormality of a circuit is detected, so that the external charging machine charges the emergency power supply.
In the process of charging the emergency power supply system by the external charger, the BMS module is powered by the external charger because the voltage of the external charger is higher than that of the emergency power supply. When the BMS module detects that the emergency power supply is fully charged, the BMS module controls the charging switch KM1 to be disconnected, at the moment, due to the existence of the internal resistance of the emergency power supply, the output voltage of the emergency power supply is slightly lower than the output voltage of the external charger, and the BMS module is still powered by the external charger, so that the electric quantity of the emergency power supply is not consumed.
It should be noted that, the first diode D1, the second diode D2 and other diodes in the present application can utilize the functional characteristics of the diodes to realize forward conduction and reverse cut-off, so as to prevent the circuit from being damaged by overvoltage and avoid mutual crosstalk between the loops.
The realization of this embodiment is when needs charge for emergency power source through external machine that charges, need not to press emergency power switch KN1, but directly gets the electricity from the input that charges and supplies power for the BMS module, ensures the normal work of BMS module.
Example two
The second embodiment of the application provides a BMS power supply circuit of an emergency power supply system, which is an improvement on the first embodiment.
Referring to fig. 2, the BMS power supply circuit of the emergency power supply system further includes a discharge switch KM2, one end of the discharge switch KM2 is connected to the positive terminal of the load as a discharge output terminal, the other end is connected to the positive terminal of the emergency power supply, and the negative terminal of the load is connected to the negative terminal of the emergency power supply; as can be seen from fig. 2, when an emergency power supply in the emergency power supply system needs to supply power to a load, the load is connected to the emergency power supply system; if the discharge switch KM2 is in an open state, the emergency power supply cannot charge the load, and after the discharge switch KM2 is closed, the emergency power supply and the load form a closed power supply circuit, so that the emergency power supply charges the load.
Referring to fig. 2 again, it can be seen that in the present application, the input end of the DC/DC1 module is connected with the discharge output end, the output control end of the BMS module is connected with the control end of the discharge switch KM2, and the BMS module controls the on/off of the discharge switch KM2 after being electrified. Therefore, when an emergency power supply in the emergency power supply system needs to supply power to a load, the load is connected into the emergency power supply system; the BMS module can directly get electricity from the output that discharges and control the switching of discharge switch KM2 after the power on, need not to close emergency power switch KN1 and comes the power on for the BMS module, more convenient and fast.
In this application, when detecting that the circuit does not have the abnormality after need giving BMS module power on, control again and discharge switch KM2 is closed make emergency power source charges for the load. The emergency power supply system is characterized in that when a load such as an automobile battery needs to be connected for discharging, the BMS can not close a discharging switch KM2 between the control load and the emergency power supply and supply power to the load when abnormal conditions such as external reverse connection, reverse charging and short circuit are recognized in advance after the BMS is electrified.
In one or more embodiments, the circuit further includes a third diode D3, the anode of the third diode D3 being connected to the discharge output terminal, and the cathode being connected to the input terminal of the DC/DC1 module.
As a possible implementation mode, when the emergency power supply system needs to be started to charge the load, the third diode D3 is turned on, the voltage output by the discharging output end is converted into the voltage for supplying power to the BMS module through the DC/DC1 module, and after the BMS module is powered on, the discharging switch KM2 is controlled to be closed when no abnormality of the circuit is detected, so that the emergency power supply charges the load.
In one or more embodiments, the charging switch KM1 and the discharging switch KM2 are electronically controlled switches, and the BMS module controls the charging switch KM1 and the discharging switch KM2 to be turned on or off.
According to the second embodiment of the application, when the emergency power supply system is required to be started for charging a load, the emergency power supply switch KN1 is not required to be pressed, the electric quantity of the emergency power supply is consumed, the electric quantity is directly taken from the discharging output end to supply power for the BMS module, normal work of the BMS module is guaranteed, and when the emergency power supply is required to be charged through an external charger, the situation that the emergency power supply switch KN1 is not required to be pressed is achieved, and the electric quantity is directly taken from the charging input end to supply power for the BMS module is guaranteed.
It should be noted that, when the emergency power supply system needs to be started to charge a load such as an automobile battery, the reason that the power can be directly taken from the discharging output end to supply power to the BMS module is that the voltage required by the BMS module is lower, although the voltage of the automobile battery is lower, the voltage requirement of the BMS module can be met.
Example III
The third embodiment of the application provides a BMS power supply circuit of an emergency power supply system, which is an improvement on the basis of the second embodiment. Referring to fig. 3, the BMS power supply circuit of the emergency power supply system further includes a capacitor bank, a second direct current-direct current conversion DC/DC2 module;
the capacitor bank is connected with the emergency power supply in parallel, and the voltage output by the emergency power supply is converted into the voltage for charging the capacitor bank through the DC/DC2 module. As can be seen from fig. 3, through the capacitor bank connected in parallel with the emergency power source, after the emergency power source switch KN1 is closed, electricity can be taken from the emergency power source or the capacitor bank to power up the BMS module, and through increasing the electricity taking path, the abnormal situation that the emergency power source is seriously consumed due to over-discharge or long-term placement is avoided, and after the emergency power source switch KN1 is closed, the BMS module cannot be powered up to judge the emergency power source system is caused.
In one or more embodiments, the circuit further includes a fourth diode D4, where an anode of the fourth diode D4 is connected to an anode terminal of the capacitor bank, and a cathode of the fourth diode D4 is connected to the input terminal of the DC/DC1 module after being connected in series to the emergency power switch KN 1.
As a possible implementation mode, when the emergency power supply system needs to be started, the emergency power supply switch KN1 is closed, the fourth diode D4 is conducted, the voltage output by the anode of the capacitor bank is converted into the voltage for supplying power to the BMS module through the DC/DC1 module, and the BMS module reports the detected fault or abnormal condition of the circuit after being electrified.
In one or more embodiments, the charging switch KM1 and the discharging switch KM2 are electronically controlled switches, and the BMS module controls the charging switch KM1 and the discharging switch KM2 to be turned on or off.
This embodiment III, can solve when emergency power supply system is because put or place for a long time and lead to emergency power supply serious power shortage, can't give the problem of BMS module electricity through emergency power switch KN1, get the electricity for the BMS module power supply through the positive pole from the electric capacity group, ensure the normal work of BMS module, and realize when needs start emergency power supply system charges for the load, need not to press emergency power switch KN1, consume emergency power supply's electric quantity, but get the electricity for the BMS module power supply directly from discharging output, ensure the normal work of BMS module, and realize when need charging for emergency power supply through external machine, need not to press emergency power switch KN1, but get the electricity for the BMS module power supply directly from charging input, ensure the normal work of BMS module.
Through the BMS power supply circuit of emergency power supply system that this application provided, the multichannel gets the electricity and makes BMS power supply more reliable and stable, when connecting special charger charge or connecting load such as vehicle lead acid battery and discharging, need not to open emergency power switch, the operation is more convenient, simultaneously, avoided when emergency power supply because put or place for a long time and lead to the serious power consumption of battery, can't go up through emergency power switch, make the user unable condition of judging emergency power supply state, and set up the diode through getting the circuit at each, avoid causing crosstalk between each getting the circuit.
Based on the same inventive concept, the present application also provides an emergency system comprising a charger, an emergency power supply system having a BMS powered circuit of the emergency power supply system as described in the previous embodiment, and a load;
when an emergency power supply in the emergency power supply system needs to be charged, the charger is connected to the emergency power supply system; the charging machine supplies power to the BMS module through the charging input end, and after the BMS module is electrified, the charging switch KM1 is controlled to be closed when the circuit is detected to be abnormal, so that the charging machine charges the emergency power supply;
when an emergency power supply in the emergency power supply system needs to supply power to a load, the load is connected into the emergency power supply system; the load supplies power to the BMS module through the discharging output end, and when the BMS module detects that a circuit is not abnormal after power-on, the discharging switch KM2 is controlled to be closed so that the emergency power supply charges the load.
The foregoing has described in detail the technical solutions provided herein, and specific examples have been used to illustrate the principles and embodiments of the present application, where the above examples are only used to help understand the methods and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A BMS powered circuit of an emergency power supply system, the circuit comprising: the battery management system comprises an emergency power supply, a first direct current-direct current conversion DC/DC1 module, a battery management system BMS module and a charging switch KM1;
one end of the charging switch KM1 is used as a charging input end and is connected with the positive end of an external charging machine, the other end of the charging switch KM is connected with the positive end of an emergency power supply, and the negative end of the external charging machine is connected with the negative end of the emergency power supply;
the input of DC/DC1 module is connected with the input that charges, and the output of DC/DC1 module is connected with the power input of BMS module, and the output control end of BMS module is connected with the control end of charging switch KM1, and the switching of charging switch KM1 is controlled to the BMS module after the power-on.
2. The circuit according to claim 1, wherein the BMS power supply circuit of the emergency power supply system further comprises a first diode D1, the positive electrode of the first diode D1 is connected to the positive terminal of the emergency power supply, and the negative electrode is connected to the input terminal of the DC/DC1 module after being connected in series to the emergency power switch KN 1.
3. The circuit of claim 1, wherein the BMS power supply circuit of the emergency power supply system further comprises a second diode D2, the anode of the second diode D2 is connected to the charging input terminal, and the cathode is connected to the input terminal of the DC/DC1 module.
4. The circuit according to claim 1, wherein the BMS power supply circuit of the emergency power supply system further comprises a discharge switch KM2, one end of the discharge switch KM2 is connected to the positive terminal of the load as a discharge output terminal, the other end is connected to the positive terminal of the emergency power supply, and the negative terminal of the load is connected to the negative terminal of the emergency power supply;
the input end of the DC/DC1 module is connected with the discharge output end, the output control end of the BMS module is connected with the control end of the discharge switch KM2, and the BMS module is electrified to control the opening and closing of the discharge switch KM 2.
5. The circuit of claim 4, wherein the BMS power supply circuit of the emergency power supply system further comprises a third diode D3, the anode of the third diode D3 is connected to the discharge output terminal, and the cathode is connected to the input terminal of the DC/DC1 module.
6. The circuit of claim 1, wherein the BMS power supply circuit of the emergency power supply system further comprises a capacitor bank, a second direct current-to-direct current conversion DC/DC2 module;
the capacitor bank is connected with the emergency power supply in parallel, and the voltage output by the emergency power supply is converted into the voltage for charging the capacitor bank through the DC/DC2 module.
7. The circuit of claim 6, wherein the BMS power supply circuit of the emergency power supply system further comprises a fourth diode D4, the anode of the fourth diode D4 is connected to the anode of the capacitor bank, and the cathode is connected to the input terminal of the DC/DC1 module after being connected in series to the emergency power switch KN 1.
8. The circuit of claim 1, wherein the emergency power source is a battery pack.
9. The circuit according to claim 2 or 4, wherein the charge switch KM1 and the discharge switch KM2 are electrically controlled switches, and the emergency power switch KN1 is a mechanical switch.
10. An emergency system comprising a charger, an emergency power supply system having the circuit of claims 1-9, and a load;
when an emergency power supply in the emergency power supply system needs to be charged, the charger is connected to the emergency power supply system; the charging machine supplies power to the BMS module through the charging input end, and after the BMS module is electrified, the charging switch KM1 is controlled to be closed when the circuit is detected to be abnormal, so that the charging machine charges the emergency power supply;
when an emergency power supply in the emergency power supply system needs to supply power to a load, the load is connected into the emergency power supply system; the load supplies power to the BMS module through the discharging output end, and when the BMS module detects that a circuit is not abnormal after power-on, the discharging switch KM2 is controlled to be closed so that the emergency power supply charges the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321976991.8U CN220307003U (en) | 2023-07-25 | 2023-07-25 | BMS power supply circuit of emergency power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321976991.8U CN220307003U (en) | 2023-07-25 | 2023-07-25 | BMS power supply circuit of emergency power supply system |
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| CN220307003U true CN220307003U (en) | 2024-01-05 |
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| CN202321976991.8U Active CN220307003U (en) | 2023-07-25 | 2023-07-25 | BMS power supply circuit of emergency power supply system |
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- 2023-07-25 CN CN202321976991.8U patent/CN220307003U/en active Active
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