Vehicle battery monitoring method

Abstract

The invention relates to the technical field of vehicle charging, in particular to a vehicle battery monitoring method. The vehicle battery monitoring method comprises the steps of awakening a battery management system and repeatedly detecting the highest temperature of a power battery on the basis that the power-off duration of a vehicle reaches a first preset duration, and meanwhile, accumulating the starting duration and the number of times; judging whether the highest temperature change of the battery meets a safety condition or not based on the fact that the starting duration reaches a second preset duration; carrying out feed detection on the starting battery after the starting frequency reaches a preset frequency, charging the starting battery when a feed condition is met, stopping charging when a charging ending condition is met, and resetting the starting frequency to be zero; on the basis that the battery temperature change meets the safety condition and the starting frequency is smaller than the preset frequency, the vehicle is controlled to be powered off, the first preset duration is prolonged, and the starting duration is reset to be zero; and the steps are repeated until the battery monitoring ending condition is met, the vehicle is controlled to be powered off, and the monitoring process is ended. Therefore, the problem that the battery monitoring energy consumption of the electric automobile is relatively high is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle charging, and in particular to a vehicle battery monitoring method. Background Art

[0002] As the power supply for the entire vehicle's electrical system, the power battery of a new energy electric vehicle is the basic guarantee for the normal operation of all electrical appliances in the vehicle. The power battery needs to provide long-term continuous power output. Overheating or short circuit of the battery may cause the battery to overheat or even catch fire, which is a safety hazard that car owners need to pay attention to. The starting battery is a key component to ensure the start-up of the vehicle and its auxiliary systems. When the vehicle is parked for too long or too late, the dark current power consumption of the vehicle may cause the starting battery to be fed, resulting in the vehicle being unable to start. The vehicle's starting battery feeding not only affects the life of the battery itself, but also affects the travel convenience of the car owner.

[0003] Existing battery monitoring methods are difficult to take into account both of these points. Common monitoring methods are to conduct long-term continuous monitoring separately, which consumes a lot of power. Therefore, how to use lower energy consumption to warn of vehicle safety hazards and power supply hazards in advance is an urgent problem to be solved. Summary of the invention

[0004] In order to solve the problem of high energy consumption of battery monitoring of electric vehicles, the present invention provides a vehicle battery monitoring method, the vehicle battery monitoring method comprising:

[0005] Step S10, waking up the battery management system based on the vehicle power-off time reaching a first preset time;

[0006] Step S20, based on the battery management system being awakened, repeatedly detecting the highest single cell temperature of the power battery at a preset frequency, and accumulating the startup time and startup times of the battery management system;

[0007] Step S30, based on the startup duration reaching a second preset duration, determining whether the change of the highest single battery temperature within the startup duration meets a safety condition;

[0008] Step S40, based on the number of startups reaching the preset number of times, performing a power supply detection on the startup battery;

[0009] Step S50, based on the starting battery reaching the power feeding condition, controlling the power battery to supplement the starting battery until the supplementing condition is reached and the supplementing stops;

[0010] Step S60, resetting the number of starts to zero based on the stopping of the charging of the starter battery;

[0011] Step S70, based on the change of the highest single battery temperature meeting the safety condition and the number of startup times being less than a preset number; controlling the vehicle to power off, extending the first preset time, and resetting the startup time to zero;

[0012] Step S80, repeating the steps S10 to S70 until the battery monitoring end condition is met, and controlling the vehicle to power off; the monitoring process ends.

[0013] In some embodiments, the safety condition is to satisfy a first condition or a second condition, wherein the first condition includes T2≤T1 and |T2-T1|≤5°C; the second condition includes T2≤55°C and |T2-T1|≤5°C;

[0014] Wherein, T1 is the highest single cell temperature of the battery management system within the initial preset period of the startup time, and T2 is the highest single cell temperature of the battery management system within the final preset period of the startup time.

[0015] In some embodiments, the step S60 further includes: reducing the preset number of times based on the stopping of the starting battery charging.

[0016] In some embodiments, the condition for ending the power replenishment includes that the startup battery is fully charged or fails.

[0017] In some embodiments, the step S60 includes steps S61 to S63;

[0018] Step S61, based on the fact that the charging of the starting battery stops after the battery is fully charged, the preset number of times is reduced at a first preset speed and the starting number is reset to zero;

[0019] Step S62, based on the fact that the charging process of the starting battery stops after a fault occurs, obtaining the charging current of the starting battery when the fault occurs and resetting the number of starts to zero;

[0020] Step S63, based on the fact that the supplementary current is less than a preset current threshold, reducing the preset number of times at a second preset speed; the second preset speed is greater than the first preset speed.

[0021] In some embodiments, step S10 includes:

[0022] Step S11, waking up the vehicle controller based on the vehicle power-off time reaching a first preset time;

[0023] Step S12, wake-up is completed based on the vehicle controller; wake up the battery management system through the vehicle controller.

[0024] In some embodiments, step S10 includes:

[0025] Step S11, based on the vehicle power-off time reaching a first preset time, waking up the remote monitoring terminal;

[0026] Step S12, based on the completion of the remote monitoring terminal wake-up; waking up the vehicle controller through the remote monitoring terminal;

[0027] Step S13, wake-up is completed based on the vehicle controller; wake up the battery management system through the vehicle controller.

[0028] In some embodiments, the battery monitoring termination condition is at least one of the following: the change in the highest single cell temperature does not meet the safety condition, a key start signal is detected, and the recharging current when the starting battery recharging fails is greater than the preset current threshold.

[0029] In some embodiments, step S80 includes:

[0030] Step S81, repeating the steps S10 to S70 until the change of the highest single battery temperature does not meet the safety condition or the supplementary current when the starter battery supplementary power fails is greater than the preset current threshold, controlling the vehicle to be powered off, and sending an early warning signal to the platform and the end user, and the monitoring process ends;

[0031] Step S82, repeating the steps S10 to S70 until a key start signal is detected, controlling the vehicle to be powered off, and the monitoring process ends.

[0032] In some embodiments, the types of vehicle power-off include power-off after charging is completed and power-off after driving is completed.

[0033] In order to solve the problem of high energy consumption of battery monitoring in electric vehicles, the present invention has the following advantages: by regularly performing temperature detection on the power battery, and gradually extending the interval period when safety is detected each time, the loss of the starting battery power can be reduced under the premise of ensuring safety, thereby reducing energy consumption. In addition, for the power feeding detection of the starting battery, the present invention does not perform detection at the same time as each safety detection, but performs the starting battery power feeding detection after the number of startups reaches a preset number, which can further reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a vehicle battery monitoring system according to an embodiment is shown;

[0035] Figure 2 A schematic flow chart of a vehicle battery monitoring method according to an embodiment is shown.

[0036] Figure numerals: 10 battery management system; 20 power battery; 30 starting battery; 40 vehicle controller; 50 remote control terminal; 60 DC inverter. DETAILED DESCRIPTION

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0038] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0039] The power battery 20 of the electric vehicle provides long-term power output and is prone to overheating, which may cause safety hazards to the vehicle; while the starting battery 30 is responsible for controlling the start-up of the vehicle and various auxiliary systems through micro-current control. When the vehicle is parked for too long, the starting battery 30 may be fed by the dark current power in the vehicle, resulting in the vehicle being unable to start normally. To this end, this embodiment discloses a vehicle battery monitoring method, such as Figure 1 As shown, the vehicle includes a battery management system 10, a power battery 20, a starting battery 30, a vehicle controller 40, a remote terminal control 50, and a DC inverter 60. The power battery 20 can charge the starting battery 30 through the DC inverter 60. Figure 1 and Figure 2 As shown, the vehicle battery monitoring method may include steps S10 to S80, and each step is described in detail as follows:

[0040] Step S10: After the vehicle is powered off for a first preset time, the battery management system 10 may be awakened, and the battery management system 10 may perform a safety check on the state of the power battery 20. The initial value of the first preset time may be 5 minutes. The safety check may be a temperature check.

[0041] Step S20: After the battery management system 10 wakes up, it can repeatedly detect the highest single cell temperature of the power battery 20 at a preset frequency, and accumulate the startup time and startup times of the battery management system 10. By repeatedly detecting the temperature of the power battery, it is possible to determine whether there is a safety hazard in the power battery according to the temperature change.

[0042] Step S30: After the accumulated startup time reaches a second preset time, it can be determined whether the change in the maximum single cell temperature during the startup time meets the safety condition. The second preset time can be 30 minutes or 10 minutes.

[0043] Step S40, after the number of startups reaches a preset number, a power feeding detection can be performed on the startup battery 30. Performing power feeding detection multiple times will consume the power of the startup battery 30 and increase the power feeding of the startup battery 30. Therefore, a preset number of intervals is set so that power feeding detection is not performed after each startup, which can further reduce energy consumption. The power feeding detection method can be to detect the voltage of the startup battery 30.

[0044] Step S50, when the starting battery 30 reaches the power feeding condition, the power battery 20 can be controlled to supplement the starting battery 30 until the supplementing condition is reached and the supplementing stops.

[0045] Step S60, after the starting battery 30 stops charging, the number of starts is reset to zero so as to accumulate the number of starts again until the preset number of starts is reached and the power feeding detection is performed again.

[0046] Step S70, when the change in the highest single-cell temperature detected within the startup time of the battery management system 10 meets the safety conditions and the number of startups is less than the preset number, the vehicle can be directly controlled to power off without performing a power supply test on the startup battery 30. The first preset time is extended to postpone the timing of the next temperature safety test on the power battery 20. The startup time is reset to zero so that the duration after the battery management system 10 is accumulated next time. Since frequent wake-up of the battery management system 10 will increase the power consumption of the startup battery 30, this solution gradually extends the interval period of the safety test, that is, the first preset time, when safety is detected. This can reduce the number of times the battery management system 10 is awakened within 24 hours while ensuring safety, reduce the loss of power to the startup battery 30, reduce energy consumption, and achieve the effect of avoiding power supply to the startup battery 30 as much as possible.

[0047] Step S80, repeating steps S10 to S70 until the battery monitoring end condition is met, controlling the vehicle to be powered off, and ending the monitoring process, stopping the temperature detection of the power battery 20 and the power feeding detection of the starting battery 30.

[0048] In this embodiment, the safety condition is to satisfy the first condition or the second condition, the first condition may include T2≤T1 and |T2-T1|≤5°C, and the second condition may include T2≤55°C and |T2-T1|≤5°C.

[0049] Wherein, T1 is the highest single cell temperature of the battery management system 10 during the initial preset period of the startup time, and T2 is the highest single cell temperature of the battery management system 10 during the final preset period of the startup time. Satisfying the safety condition means that the temperature fluctuation of the power battery 20 is normal during the startup time, and no overheating or other problems occur.

[0050] In this embodiment, step S60 may further include: after the charging of the starting battery 30 stops, the preset number of times may be reduced. Since the first preset duration, i.e., the duration after the vehicle is powered off, will gradually increase with repeated temperature detection of the power battery 20, and there is power loss of the starting battery 30 during the power-off period, if the preset number of times remains unchanged, the power loss of the starting battery 30 caused by waking up the battery management system 10 for the preset number of times will become higher and higher, and the feeding phenomenon of the starting battery 30 may not be detected in time, so the preset number of times after each power-on should be gradually reduced.

[0051] In this embodiment, the condition for ending the charging may include that the starting battery 30 is fully charged or fails. The failure may be that the battery overheats during charging, causing the charging to stop, or that the starting battery 30 fails to repair itself, causing the charging to fail.

[0052] In this embodiment, step S60 may include steps S61 to S63;

[0053] Step S61, when the starting battery 30 is fully charged and the charging stops, the preset number of times can be reduced at a first preset speed and the starting number can be reset to zero.

[0054] Step S62, when a fault occurs during the charging process of the starting battery 30, the charging stops, the charging current of the starting battery 30 when the fault occurs can be obtained and the number of starts can be reset to zero.

[0055] Step S63: When the acquired supplementary current is less than the preset current threshold, the preset number of times can be reduced at a second preset speed, which is greater than the first preset speed.

[0056] After the power is fully charged, the safety detection of the power battery 20 can be continued for a longer period of time, so the speed of reducing the preset number of times after the power of the starter battery 30 is fully charged can be set to be slower.

[0057] When a fault occurs, the current is small but not fully charged, which means that the power is higher than a certain amount but not fully charged. For example, the battery temperature is too high to cause the battery to power off. This kind of fault can be alleviated by leaving it alone. For self-repairable faults, there is no need to stop monitoring. You only need to suspend the charging process of this safety monitoring process and wait for the next charging. Therefore, the speed of reducing the preset number of times to the next charging can be set to be faster, so that when a fault occurs, it is easier to seek the next charging again to avoid serious power supply.

[0058] In this embodiment, step S10 may include:

[0059] Step S11, when the vehicle power-off time reaches a first preset time, the vehicle controller 40 can be awakened.

[0060] Step S12, after the vehicle controller 40 is awakened, the battery management system 10 can be awakened through the vehicle controller 40. In the absence of the remote monitoring terminal 50, the vehicle controller 40 can directly send an early warning signal to the terminal user.

[0061] In this embodiment, step S10 includes:

[0062] Step S11, when the vehicle power-off time reaches a first preset time, the remote monitoring terminal can be awakened.

[0063] Step S12, after the remote monitoring terminal wakes up, the vehicle controller 40 can be woken up through the remote monitoring terminal;

[0064] Step S13, after the vehicle controller 40 is awakened, the battery management system 10 can be awakened through the vehicle controller 40.

[0065] like Figure 1 As shown, when the remote monitoring terminal is used as the wake-up source after the vehicle is powered off, the remote monitoring terminal can receive remote instructions sent by the server at any time and execute the instructions through the vehicle controller 40, which is suitable for the scenario of remote monitoring and control of the vehicle. However, when only the battery intelligent charging and safety monitoring functions are realized, the vehicle controller 40 can be directly used as the wake-up source after the vehicle is powered off, without manual monitoring and operation.

[0066] In this embodiment, the battery monitoring end condition may be at least one of the following: the change in the highest single cell temperature does not meet the safety condition, a key start signal is detected, and the supplementary current of the starter battery 30 when a supplementary power failure occurs is greater than a preset current threshold.

[0067] Among them, when the highest single cell temperature does not meet the safety conditions, the power battery 20 may be overheated, and the battery monitoring should be terminated and a warning signal should be sent; when the key start signal is detected, the owner needs to use the car, and the battery monitoring process should be terminated and the normal power-on process required for driving the vehicle should be restored. When the starter battery 30 fails to replenish power, the replenishment current is greater than the preset current threshold. At this time, the power of the starter battery 30 is still low after replenishment, which may be a fault that is difficult to self-repair. After the battery monitoring is terminated, the starter battery 30 should be manually repaired and replenished.

[0068] In this embodiment, step S80 may include step S81.

[0069] Step S81, repeat steps S10 to S70 until the change in the highest single cell temperature does not meet the safety conditions or the charging current when the battery 30 fails to charge is greater than the preset current threshold, control the vehicle to power off, and send an early warning signal to the platform and end users through the remote monitoring terminal, and the monitoring process ends.

[0070] Step S82, repeating steps S10 to S70 until a key start signal is detected, the vehicle is powered off, and the monitoring process ends.

[0071] In this embodiment, the types of vehicle power-off may include power-off upon completion of charging and power-off upon completion of driving.

[0072] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A vehicle battery monitoring method, characterized in that: The vehicle battery monitoring method comprises: Step S10, waking up the battery management system based on the vehicle power-off time reaching a first preset time; Step S20, based on the battery management system being awakened, repeatedly detecting the highest single cell temperature of the power battery at a preset frequency, and accumulating the startup time and startup times of the battery management system; Step S30, based on the startup duration reaching a second preset duration, determining whether the change of the highest single battery temperature within the startup duration meets a safety condition; Step S40, based on the number of startups reaching a preset number, performing a power supply detection on the startup battery; Step S50, based on the starting battery reaching the power feeding condition, controlling the power battery to supplement the starting battery until the supplementing condition is reached and the supplementing stops; Step S60, resetting the number of starts to zero based on the stopping of the charging of the starter battery; Step S70, based on the change of the highest single battery temperature meeting the safety condition and the number of startup times being less than a preset number; controlling the vehicle to power off, extending the first preset time, and resetting the startup time to zero; Step S80, repeating the steps S10 to S70 until the battery monitoring end condition is met, and controlling the vehicle to power off; the monitoring process ends.

2. A vehicle battery monitoring method according to claim 1, characterized in that: The safety condition is to satisfy the first condition or the second condition, the first condition includes T2≤T1 and |T2-T1|≤5°C; the second condition includes T2≤55°C and |T2-T1|≤5°C; Wherein, T1 is the highest single cell temperature of the battery management system within the initial preset period of the startup time, and T2 is the highest single cell temperature of the battery management system within the final preset period of the startup time.

3. A vehicle battery monitoring method according to claim 1, characterized in that: The step S60 further includes: Based on the stopping of the starting battery charging, the preset number of times is reduced.

4. A vehicle battery monitoring method according to claim 3, characterized in that: The condition for ending the power replenishment includes that the startup battery is fully charged or fails.

5. A vehicle battery monitoring method according to claim 4, characterized in that: The step S60 includes steps S61 to S63; Step S61, based on the fact that the charging of the starting battery stops after the battery is fully charged, the preset number of times is reduced at a first preset speed and the starting number is reset to zero; Step S62, based on the fact that the charging process of the starting battery stops after a fault occurs, obtaining the charging current of the starting battery when the fault occurs and resetting the number of starts to zero; Step S63, based on the supplementary current being less than a preset current threshold, reducing the preset number of times at a second preset speed; The second preset speed is greater than the first preset speed.

6. A vehicle battery monitoring method according to claim 5, characterized in that: The step S10 comprises: Step S11, waking up the vehicle controller based on the vehicle power-off time reaching a first preset time; Step S12, wake-up is completed based on the vehicle controller; wake up the battery management system through the vehicle controller.

7. A vehicle battery monitoring method according to claim 5, characterized in that: The step S10 comprises: Step S11, based on the vehicle power-off time reaching a first preset time, waking up the remote monitoring terminal; Step S12, based on the completion of the remote monitoring terminal wake-up; waking up the vehicle controller through the remote monitoring terminal; Step S13, wake-up is completed based on the vehicle controller; wake up the battery management system through the vehicle controller.

8. A vehicle battery monitoring method according to claim 7, characterized in that: The battery monitoring termination condition is to meet at least one of the following conditions: the change in the highest single cell temperature does not meet the safety condition, a key start signal is detected, and the recharging current of the starting battery when a fault occurs is greater than the preset current threshold.

9. A vehicle battery monitoring method according to claim 8, characterized in that: The step S80 includes: Step S81, repeating the steps S10 to S70 until the change of the highest single battery temperature does not meet the safety condition or the supplementary current when the starter battery supplementary power fails is greater than the preset current threshold, controlling the vehicle to be powered off, and sending an early warning signal to the platform and the end user, and the monitoring process ends; Step S82, repeating the steps S10 to S70 until a key start signal is detected, controlling the vehicle to be powered off, and the monitoring process ends.

10. A vehicle battery monitoring method according to claim 1, characterized in that: The types of vehicle power-off include power-off after charging is completed and power-off after driving is completed.

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