CN217486379U - Power management system and vehicle - Google Patents
Power management system and vehicle Download PDFInfo
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- CN217486379U CN217486379U CN202220563444.6U CN202220563444U CN217486379U CN 217486379 U CN217486379 U CN 217486379U CN 202220563444 U CN202220563444 U CN 202220563444U CN 217486379 U CN217486379 U CN 217486379U
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Abstract
The utility model relates to a lithium cell technical field discloses a power management system and vehicle, include: one end of the vehicle state detection circuit is connected to the access port of the battery module, and the other end of the vehicle state detection circuit is connected to the output port of the DCDC module; the vehicle state detection circuit is used for detecting whether the state of a vehicle engine meets a dormancy condition when the DCDC module is in a starting state; and the execution unit is connected with the vehicle and the vehicle state detection circuit and used for controlling the DCDC module to start up when the battery module is connected to the vehicle and controlling the DCDC module to sleep when the state of the vehicle engine meets the sleep condition. The utility model discloses a when the DCDC module is started, detect vehicle engine's state to control DCDC module dormancy when vehicle engine's state satisfies the dormancy condition, thereby reach the purpose that reduces standby power consumption.
Description
Technical Field
The utility model relates to a lithium cell technical field especially relates to a power management system and vehicle.
Background
With the high-speed development of electric vehicles, the replacement frequency of lithium batteries applied to the electric vehicles is higher and higher, and the situation that the eliminated lithium batteries are applied to electric two-wheel vehicles and electric three-wheel vehicles is more and more common.
Lithium batteries applied to electric vehicles often cannot be directly connected in series to achieve a voltage suitable for electric two-wheel and three-wheel vehicles, and a DCDC (Direct Current, a device for performing conversion between high and low voltage Direct currents) module needs to be additionally arranged. Since the DCDC module has high loss when it is unloaded, in order to reduce the loss of this portion, it is necessary to put the DCDC into a sleep state when the vehicle is not started, so as to reduce the loss to increase the standby time of the vehicle. Currently, the DCDC enters the sleep state: 1. through management APP of the lithium battery, a DCDC module is made to sleep artificially in a manual control mode; 2. and under the condition that the battery and the vehicle have communication, the DCDC module is dormant through the communication. However, in most cases, the vehicle and the battery do not have a communication port, and the DCDC module can only be made to sleep in a manual operation mode, so that the experience feeling is poor, the timeliness of the operation is poor, and the effect of reducing the loss cannot reach the expectation.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a power management system and vehicle solves prior art, relies on manual operation to DCDC's dormancy control, leads to using to experience and feels relatively poor, and the reduction effect of loss can't reach anticipated problem.
In order to achieve the above object, the present invention provides the following technical solutions:
a power management system for a vehicle, comprising:
one end of the vehicle state detection circuit is connected to an access port of the battery module, and the other end of the vehicle state detection circuit is connected to an output port of the DCDC module; the vehicle state detection circuit is used for detecting whether the state of a vehicle engine meets a dormancy condition or not when the DCDC module is in a starting state;
and the execution unit is connected with a vehicle and the vehicle state detection circuit and used for controlling the DCDC module to sleep when the state of the vehicle engine meets a sleep condition.
Optionally, the vehicle state detection circuit is further configured to: when the DCDC module is in a dormant state, detecting whether the state of a vehicle engine meets a wake-up condition;
the execution unit is further to: and when the state of the vehicle engine meets the awakening condition, controlling the DCDC module to awaken.
Optionally, the vehicle state detecting unit includes an auxiliary power supply line connected between the battery module and the vehicle for supplying current for supporting vehicle start-up;
and the execution unit is used for controlling the conduction of the auxiliary power supply circuit when the DCDC module enters a dormant state.
Optionally, the vehicle state detection circuit includes an optocoupler relay, a triode is connected to pin 2 of the optocoupler relay, a collector of the triode is connected to pin 2 of the optocoupler relay, an emission set of the triode is grounded through a first resistor, and a base of the triode passes through a second resistor execution unit; the 3 pins of the optocoupler relay are connected with the anode of a diode, and the cathode of the diode is connected with the output port of the DCDC module through a current-limiting resistor; 4 pins of the optical coupling relay are connected with a battery module;
when the DCDC module enters the sleep state, the execution unit controls the auxiliary power supply circuit to be conducted, including:
the execution unit controls the optical coupling relay to be conducted, and the voltage of the battery module is input to an output port of the DCDC module through the optical coupling relay, the diode and the current-limiting resistor.
Optionally, the power management system further includes a battery sampling chip and a battery access detection circuit, the battery module is connected to the battery sampling chip and the battery access detection circuit, the battery access detection circuit is connected to an output port of the DCDC module, and the battery access detection circuit is used for detecting whether the battery module is connected or disconnected.
Optionally, the execution unit is configured to:
when the battery access detection circuit detects that the battery module is accessed, the DCDC module is controlled to be started;
and when the battery access detection circuit detects that the battery module is pulled out, controlling the DCDC module to be closed.
Optionally, the execution unit is configured to: when a vehicle engine is in a flameout state and the maintaining time of the vehicle in the flameout state exceeds a preset time, determining that the state of the vehicle engine meets a sleep condition; when the vehicle engine is in a starting state and the maintaining time of the vehicle in the starting state exceeds a preset time, the state of the vehicle engine is judged to meet the awakening condition.
Optionally, the execution unit includes an MCU.
The utility model also provides a vehicle, include as above arbitrary any power management system.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a power management system and vehicle through when the DCDC module is started, detects vehicle engine's state to control DCDC module dormancy when vehicle engine's state satisfies the dormancy condition, thereby reach the purpose that reduces standby power consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a functional block diagram of a power management system provided by the present invention;
fig. 2 is a block diagram of a power management system according to the present invention;
fig. 3 is a topology diagram of a DCDC module in a power management system according to the present invention.
Fig. 4 is a schematic diagram of a battery access detection circuit according to the present invention;
FIG. 5 is a schematic diagram of the vehicle state detection circuit of the present invention;
fig. 6 is a flow chart of a power management method of a power management system according to the present invention;
fig. 7 is a further flowchart of a power management method of a power management system according to the present invention;
fig. 8 is a further flowchart of a power management method of a power management system according to the present invention.
In the above figures: 10. a battery access detection circuit; 20. a vehicle state detection circuit; 30. a timer; 40. and an execution unit.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is to be understood that the detailed description of the invention is intended to be illustrative of the invention and is not intended to limit the invention. Wherein the exemplary embodiments are described as processes or methods depicted as flowcharts; although a flowchart may describe the operations or processing of steps in a certain order, many of the operations or steps can be performed in parallel, concurrently or simultaneously, and the order of the operations can be re-arranged. When its operations or steps are completed, the corresponding process may be terminated, with additional steps not included in the figures. The processes described above may correspond to methods, functions, procedures, subroutines, and the like, and embodiments and features of embodiments of the present invention may be combined without conflict.
The term "include" and its variants as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The technical scheme of the invention is further explained by the specific implementation mode with the attached drawings; it is to be understood that only some of the structure associated with the present invention is shown in the drawings for ease of description, and not all of the structure.
Generally, when a battery of a vehicle is connected, a part of a circuit on the side of the vehicle has static loss, and a small current is generated on the side of the battery. After the vehicle is started, the electric equipment can be divided into two parts, one part is a power part and is used for supplying power to the motor, and the working voltage is higher; the other part is an auxiliary power supply part, the starting voltage is low, and the working current is also small and is generally less than 100 mA.
The utility model discloses on this basis, a power management system is provided, DCDC's automatic dormancy function is realized to reach the purpose that reduces the energy loss.
The embodiment provides a power management system. Referring to fig. 1, a functional block diagram of a power management system in the present embodiment is shown; fig. 2 is a block diagram of a power management system in the present embodiment; FIG. 3 is a topology diagram of a DCDC module; in fig. 3, the dotted line indicates the signal flow direction, and the solid line indicates the power flow direction.
In this embodiment, the power management system includes a battery access detection circuit 10, where the battery access detection circuit 10 is configured to detect whether a battery module is accessed or pulled out; the battery access detection circuit 10 is connected with an AFE chip, the battery module is connected with the battery sampling chip and the battery access detection circuit 10, and the battery access detection circuit 10 is connected with an output port of the DCDC module. As shown in fig. 4, the battery access detection circuit 10 has LD as an output port of the AFE chip, and can recognize 100uA of output current, and DC + as an output port of the DCDC module; when the battery module is not connected, no current flows through the LD, and once a small current flows through the battery module after the battery module is connected to a vehicle, an internal circuit of the LD detects the small current and indicates that the battery is connected.
The power management system further comprises a vehicle state detection circuit 20, wherein one end of the vehicle state detection circuit 20 is connected to the access port of the battery module, and the other end of the vehicle state detection circuit 20 is connected to the output port of the DCDC module. The vehicle state detection circuit 20 is configured to detect a state of a vehicle engine when the DCDC module is in a power-on state, and determine whether the state of the vehicle engine satisfies a sleep condition; when the engine of the vehicle is in a flameout state and the maintaining time of the vehicle in the flameout state exceeds a preset time, the state of the engine of the vehicle meets a sleep condition.
The power management system further comprises an execution unit 40, wherein the execution unit 40 is connected to the vehicle and the vehicle state detection circuit 20, and is configured to control the DCDC module to enter the power-on state when the battery access detection circuit 10 detects that the battery module is accessed, and to control the DCDC module to enter the sleep state from the power-on state when the state of the vehicle engine meets the sleep condition.
The vehicle state detecting circuit 20 includes an auxiliary power supply line connected between the battery module and the vehicle for supplying current for supporting the vehicle start. When the DCDC module enters a dormant state, the battery module is conducted with the vehicle through an auxiliary power supply line so as to provide current for supporting the vehicle to start by the auxiliary power supply line.
As shown in fig. 5, the vehicle state detection circuit 20 includes an optocoupler relay U40, a transistor Q55 is connected to pin 2 of the optocoupler relay U40, a collector of the transistor Q55 is connected to pin 2 of the optocoupler relay U40, an emission set of the transistor Q55 is grounded through a first resistor R505, and a base of the transistor Q55 is connected to the execution unit 40 through a second resistor R504; the 3 pin of the optocoupler relay U40 is connected with the anode of the diode D56, and the cathode of the diode D56 is connected with the output port of the DCDC module through the current-limiting resistor R506; and 4 pins of the optocoupler relay are connected with the battery module.
The execution unit 40 includes an MCU, and when the DCDC module enters a sleep state, the MCU controls the on/off of the optocoupler relay, so that the battery module is connected to the vehicle through an auxiliary power supply line, thereby providing a small current for starting the vehicle.
When the output current of the output port of the DCDC module is smaller than a certain value and reaches a certain time, the engine of the vehicle is considered to be in a flameout state, namely the vehicle is in an un-started state, and at the moment, the engine of the vehicle meets the dormancy condition.
The vehicle state detection circuit 20 is further configured to detect a state of the vehicle engine when the DCDC module is in a sleep state, and determine whether the state of the vehicle engine satisfies a wake-up condition; when the vehicle engine is detected to be in a starting state, and the maintaining time of the vehicle in the starting state exceeds the preset time, the state of the vehicle engine meets the awakening condition. Referring to fig. 5, when the output current of the output port of the DCDC module is greater than a certain value and reaches a certain time, the vehicle engine is considered to be in a starting state, that is, the vehicle is in a starting state, and at this time, the state of the vehicle engine satisfies the wake-up condition.
When the state of the vehicle engine meets the wake-up condition, the execution unit 40 controls the DCDC module to enter the power-on state from the sleep state.
In the present embodiment, the timer 30 is connected to the vehicle state detection circuit 20, and the timer 30 is used for counting the time for maintaining the vehicle engine in the shutdown state or the startup state when the vehicle engine is in the shutdown state or the startup state.
The execution unit 40 is configured to: when the vehicle engine is in a flameout state and the maintaining time of the vehicle in the flameout state exceeds a preset time, determining that the state of the vehicle engine meets a dormancy condition; when the engine of the vehicle is in a starting state and the maintaining time of the vehicle in the starting state exceeds a preset time, the state of the engine of the vehicle is judged to meet the awakening condition.
The battery access detection unit 10 is further configured to detect whether the battery module is pulled out when the DCDC module is in a power-on state; the execution unit 40 is further configured to control the DCDC module to enter a sleep state when the battery module is pulled out when the DCDC module is in the power-on state;
the battery access detection unit 10 is further configured to detect whether the battery module is pulled out when the DCDC module is in a sleep state; the execution unit 40 is also used to control the DCDC module to enter an off state when the battery module is pulled out while the DCDC module is in the sleep state.
It is understood that the detection operation of the battery module removal by the battery insertion detection unit 10 is started after the battery module insertion, and the battery module removal can be confirmed at certain time intervals.
Specifically, the step detects a disconnection process through the reset of the LD signal, thereby confirming whether the battery module is pulled out; when the battery module is connected to the vehicle, the LD signal is at a low level and becomes a high level again after disconnection.
Based on the foregoing embodiments, the present embodiment provides a power management method based on the foregoing power management system; please refer to fig. 6, which is a flow chart of a power management method.
The power management method comprises the following steps:
and S0, detecting whether the battery module is connected.
Referring to fig. 4 together, fig. 4 is a schematic diagram of the battery access detection circuit 10, wherein LD is an output port of the AFE chip (battery sampling chip) and can identify 100uA of output current, and DC + is an output port of the DCDC module; when the battery module is not connected, no current flows through the LD, and once a small current flows through the battery module after the battery module is connected to a vehicle, an internal circuit of the LD detects the current and indicates that the battery is connected.
And S00, controlling the DCDC module to enter a starting state when the battery module is accessed.
S1, detecting the state of the vehicle engine, and judging whether the state of the vehicle engine meets the dormancy condition; if yes, go to step S2; if not, the starting state of the DCDC module is kept.
Detecting the state of a vehicle engine when the DCDC module is in a starting state, and judging whether the state of the vehicle engine meets a dormancy condition or not; when the engine of the vehicle is in a flameout state and the maintaining time of the vehicle in the flameout state exceeds a preset time, the state of the engine of the vehicle meets a sleep condition.
Referring to fig. 5, fig. 5 is a schematic diagram of the vehicle state detection circuit 20, when the output current of the output port of the DCDC module is smaller than a certain value and reaches a certain time, it is determined that the vehicle engine is in a flameout state, i.e. the vehicle is in an un-started state, and the state of the vehicle engine satisfies a sleep condition.
And S2, controlling the DCDC module to enter the dormant state from the power-on state.
When the state of the vehicle engine meets the dormancy condition, the DCDC is controlled to enter the dormancy state from the starting state, and the standby loss is reduced.
Referring to fig. 5, when the DCDC module enters the sleep state, the battery module is connected to the vehicle through an auxiliary power supply line, and the auxiliary power supply line can provide a small current for starting the vehicle.
Specifically, when the DCDC module enters a dormant state, the LD _ RLY signal is set high, the optical coupling relay is conducted, and the battery voltage is supplied to the output port through the optical coupling relay, the diode and the current limiting resistor.
S3, detecting the state of the vehicle engine, and judging whether the state of the vehicle engine meets the awakening condition; if yes, go to step S4; if not, the dormant state of the DCDC module is kept.
And when the DCDC module is in the dormant state, judging whether the state of the vehicle engine meets the awakening condition. When the vehicle engine is detected to be in a starting state, and the maintaining time of the vehicle in the starting state exceeds the preset time, the state of the vehicle engine meets the awakening condition.
Referring to fig. 5, specifically, when the output current of the output port of the DCDC module is greater than a certain value and reaches a certain time, the vehicle engine is considered to be in a starting state, that is, the vehicle is in a starting state, and the state of the vehicle engine satisfies the wake-up condition.
And S4, controlling the DCDC module to enter a power-on state from the dormant state.
When the vehicle is started, the output voltage can only supply power to the auxiliary power supply part of the vehicle, the voltage of the output port of the DCDC module is reduced due to the voltage drop of the current-limiting resistor, and the system controls the DCDC module to enter a starting state from a dormant state after detecting the voltage drop of the output port of the DCDC module, so that the DCDC module can be quickly started to supply power to the vehicle; experiments show that the whole process can be completed within 200ms, and it can be understood that the specific completion time can also vary with the actual situation, and the variations are still within the protection scope of the present invention.
Referring to fig. 7 and fig. 8, another flow chart of a power management method provided by the present invention includes:
s011, detecting whether the battery module is pulled out or not when the DCDC module is in a starting state;
and S012, controlling the DCDC module to enter a dormant state when the battery module is pulled out when the DCDC module is in a power-on state.
S013, detecting whether the battery module is pulled out or not when the DCDC module is in a dormant state;
and S014, controlling the DCDC module to enter a closed state when the battery module is pulled out when the DCDC module is in a dormant state.
After the battery module is connected, detecting whether the battery module is pulled out; when the battery module is pulled out when the DCDC module is in a starting state, controlling the DCDC module to enter a dormant state from the starting state; detecting whether the battery module is pulled out or not when the DCDC module is in a dormant state; and when the battery module is pulled out when the DCDC module is in the dormant state, controlling the DCDC module to enter the closed state. It is understood that the operation is started after the battery module, and whether the battery module is pulled out may be confirmed at certain time intervals.
Specifically, the step detects a disconnection process through the reset of the LD signal, thereby confirming whether the battery module is pulled out; when the battery module is connected with the vehicle, the LD signal is low level, and becomes high level after disconnection.
Specifically, the LD _ RLY signal in the sleep mode exists in a PWM form with a certain frequency, and when the LD _ RLY signal is at a low level, it is not detected that a current flows out from the LD, and the DCDC module enters a shutdown state; since the LD _ RLY signal is always at a low level, the output port of the DCDC module does not have a high voltage, and system loss is minimized.
Based on the foregoing embodiments, embodiments of the present invention provide a vehicle including the power management system as described in the foregoing embodiments.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A power management system for a vehicle having a battery module accessible thereto, comprising:
one end of the vehicle state detection circuit is connected to an access port of the battery module, and the other end of the vehicle state detection circuit is connected to an output port of the DCDC module; the vehicle state detection circuit is used for detecting whether the state of a vehicle engine meets a dormancy condition when the DCDC module is in a starting state;
and the execution unit is connected with the vehicle and the vehicle state detection circuit and is used for controlling the DCDC module to sleep when the state of the vehicle engine meets a sleep condition.
2. The power management system of claim 1, wherein the vehicle state detection circuit is further configured to: when the DCDC module is in a dormant state, detecting whether the state of a vehicle engine meets a wake-up condition;
the execution unit is further to: and when the state of the vehicle engine meets the awakening condition, controlling the DCDC module to awaken.
3. The power management system of claim 2, wherein the vehicle state detection unit comprises an auxiliary power supply line connected between the battery module and the vehicle for supplying a current for supporting vehicle start-up;
the execution unit is used for controlling the conduction of the auxiliary power supply line when the DCDC module enters a dormant state.
4. The power management system according to claim 3, wherein the vehicle state detection circuit comprises an optocoupler relay, a 2-pin of the optocoupler relay is connected with a triode, a collector of the triode is connected with the 2-pin of the optocoupler relay, an emission set of the triode is grounded through a first resistor, and a base of the triode passes through a second resistor execution unit; the 3 pins of the optocoupler relay are connected with the anode of a diode, and the cathode of the diode is connected with the output port of the DCDC module through a current-limiting resistor; 4 pins of the optocoupler relay are connected with the battery module;
when the DCDC module enters the sleep state, the execution unit controls the auxiliary power supply circuit to be conducted, including:
the execution unit controls the optical coupling relay to be conducted, and the voltage of the battery module is input to an output port of the DCDC module through the optical coupling relay, the diode and the current-limiting resistor.
5. The power management system according to claim 1, further comprising a battery sampling chip and a battery access detection circuit, wherein the battery module is connected to the battery sampling chip and the battery access detection circuit, the battery access detection circuit is connected to an output port of the DCDC module, and the battery access detection circuit is configured to detect whether the battery module is plugged in or unplugged.
6. The power management system of claim 5, wherein the execution unit is to:
when the battery access detection circuit detects that the battery module is accessed, the DCDC module is controlled to start;
and when the battery access detection circuit detects that the battery module is pulled out, controlling the DCDC module to be closed.
7. The power management system according to claim 2, wherein the vehicle state detection circuit is connected with a timer, and the timer is used for timing the maintaining time of the vehicle engine in a flameout state or a starting state when the vehicle engine is in the flameout state or the starting state;
the execution unit is to: when a vehicle engine is in a flameout state and the maintaining time of the vehicle in the flameout state exceeds a preset time, determining that the state of the vehicle engine meets a sleep condition; when the vehicle engine is in a starting state and the maintaining time of the vehicle in the starting state exceeds a preset time, the state of the vehicle engine is judged to meet the awakening condition.
8. The power management system of any of claims 1 to 7, wherein the execution unit comprises an MCU.
9. A vehicle comprising a power management system according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220563444.6U CN217486379U (en) | 2022-03-15 | 2022-03-15 | Power management system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220563444.6U CN217486379U (en) | 2022-03-15 | 2022-03-15 | Power management system and vehicle |
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| CN217486379U true CN217486379U (en) | 2022-09-23 |
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| CN202220563444.6U Active CN217486379U (en) | 2022-03-15 | 2022-03-15 | Power management system and vehicle |
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