A method and system for replenishing batteries in new energy vehicles

Abstract

This invention provides a method and system for charging batteries in new energy vehicles. The method includes: when the vehicle is in power-off mode and the vehicle is armed, the on-board T-Box is locally woken up every morning to detect the voltage of its B+ port. When the voltage is lower than a set voltage value, the on-board T-Box wakes up the vehicle's CAN network and the power sensor. The on-board T-Box determines whether the charging conditions are met based on the accuracy of the power sensor, the battery's power level, and the battery's health status. If yes, the next step is executed; otherwise, the battery is not charged. The on-board T-Box sends a charging request signal to the vehicle controller. If the vehicle controller sends a charging permission signal back to the on-board T-Box, the battery is charged until the charging exit condition is met, at which point the charging stops. If the charging request is not allowed, the battery is not charged. This invention can prevent vehicles from failing to start.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle technology, specifically relating to a method and system for replenishing the battery of a new energy vehicle. Background Technology

[0002] When a traditional gasoline-powered vehicle is not running, the vehicle's electrical consumption mainly comes from the battery (also known as the starter battery). At the same time, when the vehicle is stationary for a long time, due to the static current consumption of the vehicle and the self-discharge of the battery, the vehicle often fails to start due to a depleted battery.

[0003] New energy vehicles, equipped with high-voltage power batteries, can prevent starting the vehicle from malfunctioning due to a depleted battery after prolonged periods of inactivity. Current technology typically determines whether to recharge the battery by detecting its voltage. However, battery voltage is not an accurate indicator of battery charge, leading to significant errors and making it relatively easy for new energy vehicles to fail to start. Therefore, designing a battery recharging method and system for new energy vehicles to effectively reduce the likelihood of starting failures has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method for replenishing the battery of a new energy vehicle, thereby solving the aforementioned technical problems in the prior art. This invention also provides a battery replenishment system for new energy vehicles.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for replenishing the battery of a new energy vehicle includes the following steps:

[0007] Step S1: When the vehicle is in power-off mode and the vehicle is armed, the vehicle T-Box is woken up locally every morning. First, the voltage of the B+ port of the vehicle T-Box is detected. When the voltage is less than the set voltage value, the vehicle T-Box sends a network management message to wake up the vehicle CAN network and at the same time wakes up the power sensor connected to the slave node of the LIN bus.

[0008] Step S2: The vehicle T-Box determines whether the charging conditions are met based on the accuracy of the power sensor, the battery power sent by the power sensor, and the battery health status. If yes, then proceed to step S3; otherwise, the battery is not charged.

[0009] Step S3: The vehicle-mounted T-Box sends a charging request signal to the vehicle controller. After receiving the charging request signal, the vehicle controller determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the vehicle controller sends a charging permission signal to the vehicle-mounted T-Box, which then controls the DC-DC converter to charge the battery until the charging exit condition is met. After that, the vehicle-mounted T-Box controls the DC-DC converter to stop charging the battery. If the power battery's charge level is less than the first preset threshold, the vehicle controller sends a charging request disallow signal to the vehicle-mounted T-Box and does not charge the battery.

[0010] Preferably, in step S1, the voltage value is set to 11.6V-13V.

[0011] Preferably, in step S1, the local wake-up time of the vehicle-mounted T-Box is from 1:00 AM to 3:00 AM every day.

[0012] Preferably, in step S3, the charging exit condition is that the battery charge reaches a second preset threshold.

[0013] Preferably, in step S3, the condition for power replenishment to stop is that the power replenishment time reaches 30 minutes.

[0014] Preferably, it further includes: when the vehicle is stationary for a long time, the vehicle T-Box calculates the average static current based on the battery charge level and the previous battery charge level after each wake-up, and reminds the driver when the average static current level exceeds a third set threshold.

[0015] Preferably, the third set threshold is 45mA-55mA.

[0016] Preferably, the method for reminding the driver is to push reminder information to the driver through an APP installed on the driver's mobile phone.

[0017] Preferably, after the battery has been recharged 6 times in one ignition cycle, it will no longer be recharged. If the average static current is still greater than the third set threshold at this time, the vehicle T-Box will report a low battery warning and remind the driver.

[0018] A battery charging system for new energy vehicles, comprising:

[0019] A power sensor, installed on the battery, is used to detect the battery's power level.

[0020] The vehicle-mounted T-Box is communicatively connected to the power sensor and the DC-DC converter. It is used to receive the battery power signal sent by the power sensor and determine whether to send a charging request signal to the vehicle controller based on the battery power, the battery health status and the accuracy of the power sensor.

[0021] The vehicle controller communicates with the on-board T-Box and the power battery.

[0022] After receiving the power replenishment request signal, the vehicle controller determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the on-board T-Box controls the DC-DC converter to replenish the battery until the power replenishment exit condition is met. Then, the on-board T-Box controls the DC-DC converter to stop replenishing the battery, and the vehicle controller sends a power replenishment exit signal to the on-board T-Box. If the power battery's charge level is less than the first preset threshold, the vehicle controller sends a power replenishment request not allowed signal to the on-board T-Box and does not replenish the battery.

[0023] The beneficial effects of this invention are as follows:

[0024] The new energy vehicle battery charging method of the present invention employs a timed local wake-up strategy in the vehicle-mounted T-Box. It first checks the voltage of the B+ port of the vehicle-mounted T-Box. When the voltage of the B+ port is low, it indicates that the battery charge is low, and only then is the vehicle network woken up. This avoids waking up the vehicle network when the battery charge is high, effectively reducing the vehicle's static current and saving power. Simultaneously, the vehicle-mounted T-Box comprehensively judges whether the charging conditions are met based on information such as the accuracy of the current sensor, the battery charge, and the battery health status. When the charging conditions are met, a charging request is sent to the VCU, and the battery is charged via a DC-DC converter. This effectively ensures the battery charge and significantly reduces the possibility of the vehicle failing to start normally due to a low battery charge.

[0025] The new energy vehicle battery charging system provided by this invention also has the above-mentioned beneficial effects. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly described below, and the specific embodiments of the present invention will be further described in detail with reference to the drawings, wherein...

[0027] Figure 1 A flowchart of a new energy vehicle battery charging method provided in an embodiment of the present invention;

[0028] Figure 2This is an architecture diagram of a new energy vehicle battery charging system provided in an embodiment of the present invention;

[0029] Figure 3 Another architecture diagram of the new energy vehicle battery charging system provided in the embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present solution will be further described in detail below with reference to specific embodiments.

[0031] like Figure 1 As shown in the figure, this embodiment of the invention provides a method for replenishing the battery of a new energy vehicle, which includes the following steps:

[0032] Step S1: When the vehicle is in power-off mode and the vehicle is armed, the vehicle-mounted T-Box (full Chinese name: vehicle-mounted intelligent interconnection terminal) is locally woken up every morning. First, the voltage of the B+ port of the vehicle-mounted T-Box is detected. When the voltage is less than the set voltage value, the vehicle-mounted T-Box sends a network management message to wake up the vehicle CAN network and at the same time wakes up the power sensor (abbreviated as IBS) connected to the slave node of the LIN bus.

[0033] Step S2: The vehicle T-Box determines whether the charging conditions are met based on the accuracy of the power sensor, the battery power sent by the power sensor, and the battery health status (SOH). If yes, proceed to step S3; otherwise, do not charge the battery.

[0034] Step S3: The vehicle-mounted T-Box sends a charging request signal to the vehicle controller (VCU). After receiving the charging request signal, the VCU determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the VCU sends a charging permission signal to the vehicle-mounted T-Box. The vehicle-mounted T-Box then controls the DC-DC converter to charge the battery until the charging exit condition is met. After that, the vehicle-mounted T-Box controls the DC-DC converter to stop charging the battery. If the power battery's charge level is less than the first preset threshold, the VCU sends a charging request disallow signal to the vehicle-mounted T-Box and does not charge the battery.

[0035] The new energy vehicle battery charging method provided in this invention employs a timed local wake-up strategy in the vehicle-mounted T-Box. It first checks the voltage of the B+ port of the T-Box. When the voltage of the B+ port is low, indicating low battery power, the vehicle network is only woken up at this time. This avoids waking up the vehicle network when the battery power is high, effectively reducing the vehicle's static current and saving power. Simultaneously, the vehicle-mounted T-Box comprehensively judges whether the charging conditions are met based on information such as the accuracy of the current sensor, the battery power, and the battery health status. When the charging conditions are met, a charging request is sent to the VCU, and the battery is charged via a DC-DC converter. This effectively ensures the battery power and reduces the possibility of the vehicle failing to start due to a low battery, thus making it less likely for the vehicle to fail to start.

[0036] Furthermore, in step S1, the voltage value is set to 11.6V-13V, preferably 12.3V.

[0037] Specifically, in step S1, the vehicle-mounted T-Box is locally woken up between 1:00 AM and 3:00 AM daily, preferably at 2:00 AM. It is understood that the vehicle-mounted T-Box is connected to the LIN master node.

[0038] In one embodiment of the present invention, in step S3, the condition for power replenishment exit is that the battery charge reaches a second set threshold.

[0039] In another embodiment provided by the present invention, in step S3, the condition for exiting the power replenishment is that the power replenishment time reaches 30 minutes.

[0040] It is understandable that the power battery can stop supplying power to the storage battery when one of the two conditions for power replenishment is met.

[0041] Furthermore, the battery charging method for new energy vehicles provided in this embodiment of the invention also includes: when the vehicle is stationary for a long time, the on-board T-Box calculates the average static current based on the battery's charge level at the time of each wake-up, and alerts the driver when the average static current exceeds a third preset threshold. This approach can promptly alert the driver to any abnormalities in the vehicle's static current.

[0042] The formula for calculating the average quiescent current is as follows:

[0043]

[0044] I 静态电流 Represents the average quiescent current, SOC 此次 The State of Charge (SOC) represents the battery's charge level.上次 This represents the battery's charge level from the last charge.

[0045] Specifically, the third threshold is set to 45mA-55mA, preferably 50mA.

[0046] Furthermore, reminders can be sent to drivers via a push notification app installed on their mobile phones. Alternatively, reminders can be sent via SMS to the driver's phone through a mobile network operator platform.

[0047] Specifically, after the battery has been recharged six times in one ignition cycle, it will not be recharged further. If the average static current is still greater than the third preset threshold at this point, the vehicle's T-Box will report a low battery warning to the backend (i.e., the vehicle's remote service provider) and remind the driver. Understandably, the notification message pushed via the app or SMS at this time could be something like, "Abnormal static current in the vehicle; the vehicle is at risk of battery depletion. Please go to a 4S store for inspection immediately."

[0048] In one specific embodiment, the vehicle-mounted T-Box determines whether the charging conditions are met based on the data in Table 1. The table shows that when the accuracy of the battery's charge sensor is no greater than 5%, the charging conditions are met when the battery charge is <40% / SOH, and the aforementioned second set threshold is 60% / SOH; when the accuracy of the battery's charge sensor is greater than 5%, the charging conditions are met when the battery charge is <45% / SOH, and the aforementioned second set threshold is 65% / SOH.

[0049] Table 1. Relevant parameters of the storage battery

[0050]

[0051] The VCU determines whether to allow the charging request based on the data in Table 2. The table shows that when the accuracy of the power battery power sensor is no greater than 5%, the first set threshold in step S3 is 10%; when the accuracy of the power battery power sensor is greater than 5%, the first set threshold in step S3 is 15%.

[0052] Table 2 Relevant parameters of the power battery

[0053]

[0054] like Figure 2 As shown in the figure, this embodiment of the invention also provides a battery charging system for new energy vehicles, which includes:

[0055] A power sensor, installed on the battery, is used to detect the battery's power level.

[0056] The vehicle-mounted T-Box is communicatively connected to the power sensor and the DC-DC converter. It is used to receive the battery power signal sent by the power sensor and determine whether to send a charging request signal to the vehicle controller based on the battery power, the battery health status and the accuracy of the power sensor.

[0057] The vehicle controller communicates with the on-board T-Box and the power battery.

[0058] After receiving the charging request signal, the vehicle controller determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the on-board T-Box controls the DC-DC converter to close the connection between the DC-DC converter and the battery. At this time, the power battery directly charges the battery through the DC-DC converter until the charging exit condition is met. Then, the on-board T-Box controls the DC-DC converter to disconnect from the battery, the power battery stops charging the battery, and the vehicle controller sends a charging exit status signal to the on-board T-Box. The vehicle controller then enters sleep mode. If the power battery's charge level is less than the first preset threshold, the vehicle controller sends a charging request not allowed signal to the on-board T-Box and does not charge the battery.

[0059] The new energy vehicle battery charging system provided in this embodiment of the invention also has the above-mentioned technical effects.

[0060] Furthermore, such as Figure 3 As shown, the new energy vehicle battery charging system also includes a power isolation device that is connected to the vehicle T-Box for communication. The power isolation device is connected in series in the negative terminal circuit of the battery. The power isolation device has an isolation switch installed in the negative terminal circuit and a control module for controlling the opening and closing of the isolation switch. The isolation switch is normally closed. The vehicle is equipped with a trigger for closing the isolation switch.

[0061] Using this scheme, when the power battery's charge is lower than the aforementioned first set threshold, and the vehicle controller sends a power-recharge request disallowed signal to the vehicle-mounted T-Box, the vehicle-mounted T-Box will send an isolation signal to the power isolation device. Upon receiving this isolation signal, the control module of the power isolation device will disconnect the isolation switch, causing the vehicle to lose power. At this time, the static current is 0, and only the battery self-discharges, so the battery charge hardly decreases, thus ensuring that the vehicle can start normally. When the vehicle needs to be used, pressing a trigger, such as the switch on the left front door handle or the trunk release switch, directly connects to the power isolation device. When the switch is pressed, it directly wakes up the power isolation device, and the control module of the power isolation device controls the isolation switch to close, powering the vehicle and allowing it to be started using the battery. Under normal circumstances, the isolation switch is normally closed, and the power isolation device communicates with the vehicle-mounted T-Box in real time.

[0062] Preferably, the DC-DC converter and the power isolation device are connected to the vehicle-mounted T-Box via a CAN bus. Understandably, the DC-DC converter controls the connection and disconnection of the power supply line between itself and the battery based on control signals sent by the vehicle-mounted T-Box.

[0063] This invention adds battery SOH judgment conditions and algorithms. As the battery ages, the amount of charge replenished increases accordingly to ensure the battery's charge status. By collecting the real-time SOC value of the battery and combining it with the SOH value algorithm, the trigger conditions for charging are determined. When the battery charge decreases after the vehicle has been stationary for a long time, it is promptly charged to ensure that the battery has sufficient charge for the vehicle to start.

[0064] The above are merely preferred embodiments of the present invention. It should be noted that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Moreover, after reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A method for replenishing the battery of a new energy vehicle, characterized in that, It includes the following steps: Step S1: When the vehicle is in power-off mode and the vehicle is armed, the vehicle T-Box is woken up locally every morning. First, the voltage of the B+ port of the vehicle T-Box is detected. When the voltage is less than the set voltage value, the vehicle T-Box sends a network management message to wake up the vehicle CAN network and at the same time wakes up the power sensor connected to the slave node of the LIN bus. Step S2: The vehicle T-Box determines whether the charging conditions are met based on the accuracy of the power sensor, the battery power sent by the power sensor, and the battery health status (SOH). If yes, proceed to step S3; otherwise, do not charge the battery. When the accuracy of the power sensor is no greater than 5%, the battery charge is less than 40% / SOH, and the charging condition is met; when the accuracy of the power sensor is greater than 5%, the battery charge is less than 45% / SOH, and the charging condition is met. Step S3: The vehicle-mounted T-Box sends a charging request signal to the vehicle controller. After receiving the charging request signal, the vehicle controller determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the vehicle controller sends a charging permission signal to the vehicle-mounted T-Box, which then controls the DC-DC converter to charge the battery until the charging exit condition is met. After that, the vehicle-mounted T-Box controls the DC-DC converter to stop charging the battery. If the power battery's charge level is less than the first preset threshold, the vehicle controller sends a charging request disallow signal to the vehicle-mounted T-Box and does not charge the battery.

2. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, In step S1, the voltage value is set to 11.6V-13V.

3. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, In step S1, the vehicle-mounted T-Box is locally woken up between 1:00 AM and 3:00 AM every day.

4. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, In step S3, the condition for power replenishment to stop is that the battery charge reaches a second preset threshold.

5. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, In step S3, the condition for power replenishment to stop is that the power replenishment time reaches 30 minutes.

6. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, It also includes: when the vehicle is stationary for a long time, the vehicle T-Box calculates the average static current based on the battery charge and the previous battery charge after each wake-up. When the average static current is greater than a third set threshold, the driver is alerted.

7. The method for replenishing the battery of a new energy vehicle according to claim 6, characterized in that, The third threshold is set at 45mA-55mA.

8. The method for replenishing the battery of a new energy vehicle according to claim 6, characterized in that, The method for reminding drivers is to push reminder messages to them via an app installed on their mobile phones.

9. The method for replenishing the battery of a new energy vehicle according to claim 6, characterized in that, In one ignition cycle, after the battery has been recharged 6 times, it will no longer be recharged. If the average static current is still greater than the third set threshold at this time, the vehicle T-Box will report a low battery warning and remind the driver.

10. A battery charging system for new energy vehicles, characterized in that, It includes: A power sensor, installed on the battery, is used to detect the battery's power level. The vehicle-mounted T-Box is communicatively connected to the power sensor and DC-DC converter. It receives the battery power signal sent by the power sensor and determines whether to send a charging request signal to the vehicle controller based on the battery power, battery health status, and the accuracy of the power sensor. When the accuracy of the power sensor is no greater than 5%, a charging request is triggered when the battery power is <40% / SOH; when the accuracy of the power sensor is greater than 5%, a charging request is triggered when the battery power is <45% / SOH. The vehicle controller communicates with the on-board T-Box and the power battery. After receiving the power replenishment request signal, the vehicle controller determines whether the power battery's charge level is greater than a first preset threshold. If the power battery's charge level is greater than the first preset threshold, the on-board T-Box controls the DC-DC converter to replenish the battery until the power replenishment exit condition is met. Then, the on-board T-Box controls the DC-DC converter to stop replenishing the battery, and the vehicle controller sends a power replenishment exit signal to the on-board T-Box. If the power battery's charge level is less than the first preset threshold, the vehicle controller sends a power replenishment request not allowed signal to the on-board T-Box and does not replenish the battery.

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