Self-adaptive charging method and system for small battery of electric vehicle

Abstract

The invention discloses a self-adaptive charging method and system for a small battery of an electric vehicle, and the method comprises the steps: judging whether the vehicle is in a power-off state or not and whether the current time is preset or not when the replacement of the small battery is detected; if yes, the small battery management system EBS continuously awakens the gateway GWM, and the gateway GWM awakens the whole vehicle network; and when the EBS detects that the voltage of the small battery is reduced to the critical voltage V1 of the vehicle controller, the EBS stores the corresponding electric quantity value SOC1 of the small battery at the moment, sends out a charging warning, charges the small battery, and sleeps until the small battery is fully charged. The EBS can obtain a new charging MAP through interpolation according to the comparison between the SOC and voltage of the current small battery and the charging MAP of the original small battery. According to the invention, the charging MAP can be automatically changed according to the replaced small battery, unnecessary charging times are avoided, and meanwhile, small battery feed can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a method and system for adaptively replenishing power of a small battery of an electric vehicle. Background Art

[0002] With the development of intelligent automobiles, more and more vehicle body parts are configured, resulting in an increasing consumption of dark current in vehicles. Long-term parking of vehicles can easily lead to power feeding of small batteries, and the whole vehicle cannot be started. Therefore, timely recharging the small battery with the power of the large battery can avoid the above-mentioned working conditions. At present, most methods for recharging small batteries use EBS (small battery management system) to detect that the SOC (battery power) of the small battery is lower than the critical value, and send a low-voltage alarm signal to the gateway (GWM). GWM sends a recharge request to the VCU (vehicle controller) according to the warning level, and requests the BMS (battery management system) to close the relay and use the large battery to recharge the small battery. However, when the small battery originally configured by the electric vehicle fails and needs to be replaced, the EBS still uses the original strategy to send a low-voltage alarm to the gateway, which is easy to cause unnecessary energy waste to the whole vehicle or cause undervoltage of the small battery.

[0003] At present, there are still major problems with the small battery recharging. For example, if the capacity of the replaced small battery is larger than the original small battery, the recharging is determined only based on the SOC of the small battery. Then, when the voltage of the small battery is high, the EBS may issue a low voltage alarm, resulting in unnecessary energy waste. And if the capacity of the replaced small battery is smaller than the original small battery, the recharging is determined only based on the SOC of the small battery. Then, when the voltage of the small battery is low, the EBS may issue a low voltage alarm, resulting in the small battery recharging. Summary of the invention

[0004] In order to solve the above-mentioned problem that the original EBS power replenishment request critical value cannot meet the current small battery due to the replacement of the small battery, the present invention provides an electric vehicle small battery adaptive power replenishment method and system.

[0005] The present invention provides an adaptive charging method for a small battery of an electric vehicle, the method comprising: when detecting replacement of a small battery, determining whether the vehicle is in a power-off state and is currently in a preset time; if so, the small battery management system EBS continuously wakes up the gateway GWM, and the gateway GWM wakes up the entire vehicle network; when the small battery management system EBS detects that the voltage of the small battery is reduced to a critical voltage V1 of a vehicle controller, the small battery management system EBS stores the corresponding small battery power value SOC1 at this time, and issues a charging warning to charge the small battery.

[0006] Optionally, the method for detecting replacement of a small battery includes: the small battery management system EBS pre-stores a small battery charging MAP as a reference for each replacement of the small battery; the small battery management system EBS detects the voltage and power value of the small battery in real time to determine whether to replace the small battery.

[0007] Optionally, the method further includes: during the charging process, the small battery management system EBS stores the voltage and battery power value of the small battery in real time; after the charging is completed, the small battery management system EBS corrects the current small battery charging MAP according to the voltage and power value corresponding to each charging warning level.

[0008] Optionally, the method further includes: the small battery management system EBS updates the replenishment MAP.

[0009] Optionally, the method for the small battery management system EBS to correct the current small battery charging MAP according to the voltage and power value corresponding to each charging warning level includes:

[0010] The small battery management system EBS linearly interpolates the voltage corresponding to the power value SOC of the small battery at each charging warning level to the small battery power value SOC corresponding to the current small battery voltage value.

[0011] Optionally, the MAP refers to a small battery SOC in the horizontal axis and a small battery voltage in the vertical axis.

[0012] The present invention also provides an adaptive charging system for small batteries of electric vehicles, the system comprising: a detection unit, used to detect the voltage, power and current time point of the small battery; a judgment unit, used to judge whether the vehicle is in a power-off state and whether the current time point is at a preset time, if so, continuously waking up the gateway GWM, and the gateway GWM wakes up the entire vehicle network; a charging unit, when the detection unit detects that the voltage of the small battery is reduced to the critical voltage V1 of the vehicle controller, the detection unit stores the corresponding small battery power value SOC1 at this time, and issues a charging warning to charge the small battery.

[0013] Optionally, the detection unit includes a small battery management system EBS and Tbox. The small battery management system EBS is used to detect the voltage and power of the small battery, and is also used to pre-store the small battery charging MAP as a reference each time the small battery is replaced. The Tbox is used to obtain the current time point.

[0014] Optionally, the small battery management system EBS is also used to compare the current small battery power SOC and voltage with the original small battery charging MAP, and obtain a new charging MAP through interpolation.

[0015] Optionally, the small battery management system EBS is also used to update the replenishment MAP.

[0016] In the technical solution provided by the embodiment of the present invention, when the replacement of the small battery is detected, it is determined whether the vehicle is in a power-off state and is currently in a preset time; if so, the small battery management system EBS continues to wake up the gateway GWM, and the gateway GWM wakes up the entire vehicle network; when the small battery management system EBS detects in real time that the voltage of the small battery is reduced to the critical voltage V1 of the vehicle controller, the small battery management system EBS stores the corresponding small battery power value SOC1 at this time, and issues a recharging warning to recharge the small battery. Compared with the prior art, the present invention can automatically change the original small battery recharging MAP according to the replaced small battery, and when the small battery has been used for a long time, the recharging MAP can also be replaced according to the above method, avoiding unnecessary recharging times and also avoiding small battery feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flow chart of a method for adaptively replenishing power of a small battery in an electric vehicle.

[0018] Figure 2 The present invention is a schematic diagram of the principle of a method for adaptively replenishing power for a small battery of an electric vehicle.

[0019] Figure 3 Schematic diagram of the power and voltage of the small battery in the present invention.

[0020] Figure 4 The present invention is a schematic diagram of an adaptive power replenishment system for a small battery of an electric vehicle. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Please refer to Figure 1 As shown, the present invention provides an adaptive charging method for a small battery of an electric vehicle, the method comprising the following steps:

[0023] Step S10, when it is detected that a small battery has been replaced, it is determined whether the vehicle is in a power-off state and is currently in a preset time.

[0024] Step S20: If yes, the small battery management system continues to wake up the gateway, and the gateway wakes up the entire vehicle network.

[0025] Step S30, when the small battery management system detects that the voltage of the small battery drops to the critical voltage V1 of the vehicle controller, the small battery management system stores the corresponding small battery power value SOC1 at this time, and issues a recharge warning to recharge the small battery. It goes into sleep mode after being fully recharged. The power value SOC1 of the small battery refers to the remaining power value of the small battery.

[0026] EBS can compare the current small battery SOC and voltage with the original small battery charging MAP, and obtain a new charging MAP through interpolation.

[0027] In one embodiment of the present invention, the following steps are further included before step S10:

[0028] The small battery management system pre-stores the small battery recharging MAP as a reference each time the small battery is replaced;

[0029] The small battery management system detects the voltage and power value of the small battery in real time to determine whether to replace the small battery. The MAP refers to the small battery power SOC on the horizontal axis and the small battery voltage on the vertical axis.

[0030] In one embodiment of the present invention, the following steps are further included after step S30:

[0031] During the charging process, the small battery management system stores the voltage and battery power value of the small battery in real time;

[0032] After the charging is completed, the small battery management system corrects the current small battery charging MAP according to the voltage and power value corresponding to each charging warning level; specifically, the small battery management system linearly interpolates the voltage corresponding to the power value SOC of the small battery at each charging warning level to the small battery power value SOC corresponding to the current small battery voltage value.

[0033] The small battery management system updates the replenishment MAP.

[0034] Please refer to Figure 2 As shown, the overall specific steps of the present invention are as follows:

[0035] When the small battery management system EBS detects that a new small battery has been replaced, it determines whether the vehicle is in a power-off state, and Tbox obtains whether the current time is in a preset time, wherein the preset time may be the early morning time period, during which the vehicle is mostly not in use. The present invention first permanently stores the MAP of the original small battery when it is recharged in the small battery management system EBS as a reference for each replacement of the small battery, wherein MAP refers to the small battery power SOC on the horizontal axis and the small battery voltage on the vertical axis.

[0036] If so, the gateway wakes up the vehicle network to consume the small battery. At the same time, the small battery management system EBS detects the small battery's power SOC and small battery voltage in real time.

[0037] When the small battery management system EBS detects that the small battery has consumed power to the critical voltage V1 of the vehicle controller's operating point, the small battery management system EBS starts to store the corresponding small battery power SOC1 value, and at the same time sends a low battery replenishment warning to the gateway. The gateway sends a replenishment request, and the vehicle controller VCU requests the small battery management system BMS to power on to replenish the battery. During the replenishment process, the small battery management system EBS needs to store the small battery voltage and power SOC value in real time until the replenishment is completed.

[0038] After the charging is completed, the small battery management system EBS corrects the current small battery charging MAP according to the original small battery charging warning threshold. Correction method: According to the small battery voltage corresponding to the SOC at the original small battery charging warning level, linearly interpolate to the small battery SOC corresponding to the current small battery voltage value. At the same time, EBS stores the small battery SOC corresponding to different charging warning levels under the current new charging strategy.

[0039] As the usage time of the small battery increases, the internal resistance of the small battery increases, and the corresponding small battery voltage at each power SOC will decrease. At this time, the small battery management system EBS still uses the above-mentioned power replenishment MAP, and there will also be a risk of small battery power feeding; therefore, it is necessary to use the above-mentioned strategy to correct the small battery power replenishment MAP.

[0040] Please refer to Figure 3 As shown in the figure, when the original small battery is at SOC4, the small battery management system EBS issues a low voltage warning level 1. After replacing the small battery, the corresponding power level of the low voltage warning level 1 is SOC3; when the original small battery is at SOC2, the small battery management system EBS issues a low voltage warning level 2. After replacing the small battery, the corresponding power level of the low voltage warning level 2 is SOC1. By updating the strategy, it avoids issuing inappropriate low power prompts when the small battery voltage is too high or too low, saving costs and avoiding small battery power feeding.

[0041] The present invention proposes an adaptive charging method to solve the problem that the original charging strategy cannot adapt to the new small battery after the vehicle replaces the small battery. The present invention can automatically change the original small battery charging MAP according to the replaced small battery. At the same time, when the small battery has been used for a long time, the charging MAP can also be replaced according to the above method, avoiding unnecessary charging times and also avoiding small battery feeding.

[0042] One embodiment of the present invention also provides an electric vehicle small battery adaptive charging system, please refer to Figure 4 As shown, the system comprises:

[0043] The detection unit 100 is used to detect the voltage, power and current time point of the small battery;

[0044] The judgment unit 200 is used to judge whether the vehicle is in a power-off state and whether the current time point is at a preset time. If so, the gateway is continuously awakened, and the gateway awakens the vehicle network;

[0045] When the charging unit 300 and the detection unit 100 detect that the voltage of the small battery drops to the critical voltage V1 of the vehicle controller, the detection unit 100 stores the corresponding small battery power value SOC1 at this time, and issues a charging warning to charge the small battery.

[0046] The detection unit 100 includes a small battery management system and a Tbox. The small battery management system is used to detect the voltage and power of the small battery, and is also used to pre-store the small battery charging MAP as a reference each time the small battery is replaced. The Tbox is used to obtain the current time point.

[0047] The electric vehicle small battery adaptive charging system described in the present invention also includes a vehicle controller VCU. When detecting the replacement of a small battery, it determines whether the vehicle is in a power-off state and is currently in a preset time; if so, the small battery management system continues to wake up the gateway, and the gateway wakes up the vehicle network; when the small battery management system EBS detects that the small battery consumes power to the critical voltage V1 of the vehicle controller working point, it sends a low battery charging warning to the gateway, the gateway sends a charging request, and the vehicle controller VCU requests the small battery management system BMS to power on to charge the battery.

[0048] The small battery management system of the present invention is also used to pre-store the small battery charging MAP as a reference each time the small battery is replaced. The battery management system detects the voltage and power value of the small battery in real time to determine whether to replace the small battery. The small battery management system is also used to correct the current small battery charging MAP according to the voltage and power value corresponding to each charging warning level. The small battery management system is also used to update the charging MAP.

[0049] It should be noted that the technical solution of the adaptive power replenishment system for small batteries of electric vehicles and the technical solution of the adaptive power replenishment method for small batteries of electric vehicles mentioned above belong to the same concept. For the details not described in detail in the technical solution of the adaptive power replenishment system for small batteries of electric vehicles, please refer to the description of the technical solution of the adaptive power replenishment method for small batteries of electric vehicles mentioned above.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adaptive charging method for a small battery of an electric vehicle, characterized in that: The method comprises: When a small battery replacement is detected, determine whether the vehicle is in a power-off state and whether the current time is within the preset time; If so, the small battery management system EBS continues to wake up the gateway GWM, and the gateway GWM wakes up the vehicle network; When the small battery management system EBS detects that the voltage of the small battery drops to the critical voltage V1 of the vehicle controller, the small battery management system EBS stores the corresponding small battery power value SOC1 at this time, and issues a recharging warning to recharge the small battery.

2. The method for adaptively replenishing electric vehicle small batteries according to claim 1 is characterized in that: The method for detecting replacement of a small battery comprises: The small battery management system EBS pre-stores the small battery charging MAP as a reference for each small battery replacement; The small battery management system EBS detects the voltage and power value of the small battery in real time to determine whether the small battery should be replaced.

3. The electric vehicle small battery adaptive power replenishment method according to claim 2 is characterized in that: The method further comprises: During the charging process, the small battery management system EBS stores the voltage and battery power value of the small battery in real time; After the charging is completed, the small battery management system EBS corrects the current small battery charging MAP according to the voltage and power values ​​corresponding to each charging warning level.

4. The electric vehicle small battery adaptive power replenishment method according to claim 3 is characterized in that: The method further comprises: The small battery management system EBS updates the power replenishment MAP.

5. The electric vehicle small battery adaptive power replenishment method according to claim 3 is characterized in that: The method for the small battery management system EBS to correct the current small battery charging MAP according to the voltage and power value corresponding to each charging warning level includes: The small battery management system EBS linearly interpolates the voltage corresponding to the power value SOC of the small battery at each charging warning level to the small battery power value SOC corresponding to the current small battery voltage value.

6. The electric vehicle small battery adaptive power replenishment method according to claims 2-5 is characterized in that: The MAP refers to a small battery capacity SQC represented by the horizontal axis, and a small battery voltage represented by the vertical axis.

7. An adaptive charging system for small batteries of electric vehicles, characterized in that: The system comprises: A detection unit, used to detect the voltage, power and current time point of the small battery; A judgment unit is used to judge whether the vehicle is in a power-off state and whether the current time point is at a preset time. If so, the gateway GWM is continuously awakened, and the gateway GWM wakes up the vehicle network; When the charging unit detects that the voltage of the small battery drops to the critical voltage V1 of the vehicle controller, the detection unit stores the corresponding small battery power value SOC1 at this time, and issues a charging warning to charge the small battery.

8. The electric vehicle small battery adaptive power replenishment system according to claim 7 is characterized in that: The detection unit includes a small battery management system and a Tbox. The small battery management system is used to detect the voltage and power of the small battery, and is also used to pre-store the small battery charging MAP as a reference each time the small battery is replaced. The Tbox is used to obtain the current time point.

9. The electric vehicle small battery adaptive power replenishment system according to claim 8 is characterized in that: The small battery management system EBS is also used to compare the current small battery power SOC and voltage with the original small battery charging MAP, and obtain a new charging MAP through interpolation.

10. The electric vehicle small battery adaptive power replenishment system according to claim 9, characterized in that: The small battery management system is also used to update the replenishment MAP.

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