A battery charging control method, device and electric vehicle

Abstract

This invention provides a battery charging control method, device, and electric vehicle, relating to the field of electric vehicle technology. The battery charging control method includes: when the battery enters a charging state, determining whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining capacity, the temperature, and the charging time. The solution of this invention provides refined control of battery charging and reduces the risk of battery depletion and vehicle power consumption.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle technology, and in particular relates to a battery charging control method, device and electric vehicle. Background Technology

[0002] Existing intelligent battery control is based on the remaining battery power and battery health status provided by intelligent battery sensors. However, it does not take into account the impact of ambient temperature on battery charging characteristics. For example, in winter, the battery charging current is smaller, which can lead to the battery not being able to fully charge at low temperatures, resulting in battery depletion. Or, at normal temperatures, the battery charging time is too long, which can increase vehicle power consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a battery charging control method, device, and electric vehicle, thereby solving the problem that ambient temperature has a significant impact on the charging characteristics of batteries in the prior art.

[0004] To achieve the above objectives, embodiments of the present invention provide a battery charging control method, applied to a vehicle control unit, comprising:

[0005] When the battery is in a charging state, it is determined whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time.

[0006] Optionally, determining whether the battery is fully charged based on at least one of the following: current charging current acquisition status, temperature acquisition status, charging current, remaining capacity, temperature, and charging time, includes:

[0007] If the charging current acquisition status is normal, determine whether the battery is fully charged based on the temperature acquisition status, the charging current, and the charging time.

[0008] If the charging current acquisition status is abnormal, determine whether the battery is fully charged based on the remaining power and the charging time.

[0009] Optionally, when the charging current acquisition status is normal, determining whether the battery is fully charged based on the temperature acquisition status, the charging current, and the charging time includes:

[0010] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is greater than the first temperature threshold and the charging current is continuously less than the first current threshold for a first time, it is determined that the battery is in a fully charged state.

[0011] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is less than or equal to the first temperature threshold, and after the second time, the charging current is continuously less than the first current threshold within the first time period, it is determined that the battery is in a fully charged state.

[0012] If the charging current acquisition status is normal and the temperature acquisition status is abnormal, and if, after the second time, the charging current remains less than the first current threshold during the first time period, the battery is determined to be fully charged.

[0013] Optionally, if the charging current acquisition status is abnormal, determining whether the battery is fully charged based on the remaining power and the charging time includes:

[0014] If the remaining power remains unchanged within the third time period, the battery is determined to be fully charged.

[0015] Optionally, the method further includes:

[0016] The remaining battery power is obtained when the vehicle is in a wake-up state;

[0017] When the remaining battery power is less than the charging start threshold, the vehicle is powered on by high voltage, and the battery is controlled to enter the charging state.

[0018] Optionally, when the remaining battery power is less than the charging start threshold, the vehicle's high voltage is energized, and the battery is controlled to enter the charging state, including:

[0019] When the remaining battery power is less than the charging start threshold, the vehicle door lock status and the power battery status are detected.

[0020] Based on the vehicle door lock status and the power battery status, the vehicle is guided to receive high-voltage power, and the battery is controlled to enter the charging state through the DC-DC conversion unit.

[0021] Optionally, the method further includes:

[0022] When the battery is fully charged, control the battery to exit the charging state and guide the vehicle to power down.

[0023] This invention also provides a battery charging control device, comprising:

[0024] The determination module is used to determine whether the battery is fully charged when the battery is in the charging state, based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time.

[0025] Optionally, the determination module includes:

[0026] The first judgment unit is used to determine whether the battery is fully charged based on the temperature acquisition status, the charging current, and the charging time when the charging current acquisition status is normal.

[0027] The second judgment unit is used to determine whether the battery is fully charged based on the remaining power and the charging time when the charging current acquisition status is abnormal.

[0028] Optionally, the first determination unit is specifically used for:

[0029] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is greater than the first temperature threshold and the charging current is continuously less than the first current threshold for a first time, it is determined that the battery is in a fully charged state.

[0030] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is less than or equal to the first temperature threshold, and after the second time, the charging current is continuously less than the first current threshold within the first time period, it is determined that the battery is in a fully charged state.

[0031] If the charging current acquisition status is normal and the temperature acquisition status is abnormal, and if, after the second time, the charging current remains less than the first current threshold during the first time period, the battery is determined to be fully charged.

[0032] Optionally, the second determination unit is specifically used for:

[0033] If the remaining charge level remains unchanged within a third time period, the battery is determined to be fully charged.

[0034] Optionally, the device further includes:

[0035] The acquisition module is used to acquire the remaining battery power when the vehicle is in a wake-up state;

[0036] The first control module is used to guide the vehicle to high voltage and control the battery to enter the charging state when the remaining power is less than the charging start threshold.

[0037] Optionally, the first control module is specifically used for:

[0038] When the remaining battery power is less than the charging start threshold, the vehicle door lock status and the power battery status are detected.

[0039] Based on the vehicle door lock status and the power battery status, the vehicle is guided to receive high-voltage power, and the battery is controlled to enter the charging state through the DC-DC conversion unit.

[0040] Optionally, the device further includes:

[0041] The second control module is used to control the battery to exit the charging state and guide the vehicle to shut down the high voltage when the battery is fully charged.

[0042] This invention also provides an electric vehicle, including the battery charging control device described above.

[0043] This invention also provides a readable storage medium storing a program, which, when executed by a processor, implements the battery charging control method described above.

[0044] The above-described technical solution of the present invention has at least the following beneficial effects:

[0045] In the above scheme, the battery charging control method determines whether the battery is fully charged based on at least one of the following when the battery enters the charging state: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time. This maximizes the chances of the battery being fully charged, avoids the risk of power loss, effectively extends the battery's service life, and improves the user experience. Attached Figure Description

[0046] Figure 1 This is one of the flowcharts illustrating the battery charging control method according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a battery charging control system according to an embodiment of the present invention;

[0048] Figure 3 This is a second schematic flowchart of the battery charging control method according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of a battery charging control device according to an embodiment of the present invention. Detailed Implementation

[0050] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0051] This invention addresses the problem that ambient temperature has a significant impact on the charging characteristics of batteries in the prior art by providing a battery charging control method, device, and electric vehicle.

[0052] like Figure 1 As shown, this embodiment of the invention provides a battery charging control method applied to a VCU (Vehicle Control Unit), comprising:

[0053] Step 101: When the battery is in the charging state, determine whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time.

[0054] It should be noted that the battery charging control method provided in this embodiment of the invention can be applied to, for example... Figure 2 The battery charging control system shown includes a VCU connected to a BMS (Battery Management System), a BCM (Body Control Management System), and a DCDC (Direct Current Converter) via a CAN (Controller Area Network) line. The BCM is connected to an IBS (Intelligent Battery Sensor) via a LIN (Local Interconnect Network) line. The DCDC is connected to the power battery and the storage battery via wiring harnesses. The IBS is connected to the battery sensor via wiring harnesses.

[0055] Here, IBS can accurately measure monitoring parameters such as battery voltage, current, and terminal temperature, and calculate the remaining power and battery health status based on these monitoring parameters. Therefore, the battery charging control method of this embodiment can correct the battery health status, identify battery degradation in advance, avoid battery intelligent charging failure, effectively extend battery life, and thus improve user experience.

[0056] In addition, the IBS wakes up the BCM via the LIN bus. The IBS feeds back the current charging current, temperature, charging current, remaining charge, and temperature of the battery to the BCM via the LIN bus, and then uploads them to the CAN bus via the BCM. Thus, the VCU can obtain the current charging current, temperature, charging current, remaining charge, and temperature of the battery via the CAN bus. When the battery enters the charging state, it begins recording the charging time. Furthermore, the BCM detects the status of the vehicle's hood and feeds back the hood status to the VCU via the CAN bus.

[0057] It should also be noted that the battery in this embodiment of the invention is a low-voltage battery; the charging current is the charging and discharging current of the battery.

[0058] In this embodiment of the invention, when the battery is in a charging state, the system determines whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time. This maximizes the chances of the battery being fully charged, avoids the risk of power loss, effectively extends the battery's lifespan, and improves the user experience.

[0059] Optionally, step 101 involves determining whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining capacity, the temperature, and the charging time.

[0060] If the charging current acquisition status is normal, determine whether the battery is fully charged based on the temperature acquisition status, charging current, and charging time.

[0061] If the charging current acquisition status is abnormal, determine whether the battery is fully charged based on the remaining power and charging time.

[0062] It should be noted that when the current charging current acquisition status of the battery is normal, that is, the charging current provided by the battery is valid, and it can be used to determine whether the battery is fully charged; when the current charging current acquisition status of the battery is abnormal, that is, the charging current provided by the battery is invalid, it is impossible to determine whether the battery is fully charged based on the charging current. In order to improve the robustness of the battery charging control system, in this case, it is possible to determine whether the battery is fully charged based on the remaining battery capacity and charging time, thereby ensuring that the battery can be fully charged and reducing the risk of battery depletion.

[0063] Specifically, when the charging current acquisition status is normal, the system determines whether the battery is fully charged based on the temperature acquisition status, charging current, and charging time, including:

[0064] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is greater than the first temperature threshold and the charging current is continuously less than the first current threshold within the first time period, the battery is determined to be in a fully charged state.

[0065] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is less than or equal to the first temperature threshold, and after the second time, the charging current is continuously less than the first current threshold in the first time, the battery is determined to be fully charged.

[0066] If the charging current acquisition status is normal and the temperature acquisition status is abnormal, and if the charging current is consistently less than the first current threshold during the first time period after the second time period, the battery is determined to be fully charged.

[0067] Here, the first temperature threshold is a preset low temperature threshold for the battery. When the current temperature of the battery is greater than the first temperature threshold, the battery is in normal temperature condition; when the current temperature of the battery is less than or equal to the first temperature threshold, the battery is in low temperature condition.

[0068] It should be noted that, when both the battery charging current acquisition status and the temperature acquisition status are normal, the methods for determining the battery under different temperature conditions should first be distinguished:

[0069] When the battery is in normal operating conditions, it is determined whether the battery is fully charged based on the charging current. That is, when the charging current of the battery is continuously less than the first current threshold for the first time, the battery is determined to be fully charged. The first time is also the charging time.

[0070] When the battery is in a low-temperature operating condition, whether the battery is fully charged is determined directly based on the charging current and charging time. That is, the battery must first ensure that the minimum charging time has been reached, which is the second time. Then, after the second charging time, if the charging current of the battery is continuously less than the first current threshold in the first time, the battery is determined to be fully charged.

[0071] It should also be noted that when the battery charging current acquisition status is normal and the temperature acquisition status is abnormal, the battery temperature cannot be detected, and the battery may be in a low-temperature condition. Therefore, in order to ensure that the battery is fully charged, the method for judging the low-temperature condition mentioned above is the same. That is, the battery must first ensure that it has reached the minimum charging time, which is the second time. Then, after the second charging time, if the battery charging current is continuously less than the first current threshold in the first time, the battery is judged to be in a fully charged state, thereby maximizing the full charge and avoiding depletion.

[0072] Furthermore, when the charging current acquisition status is abnormal, the system determines whether the battery is fully charged based on the remaining charge and charging time, including:

[0073] If the remaining charge remains unchanged within the third time period, the battery is considered to be fully charged.

[0074] It should be noted that if the charging current acquisition of the battery is abnormal, the charging current provided by the battery is invalid. The battery is judged to be fully charged based on the remaining power. When the remaining power remains unchanged for three consecutive time periods, the battery is judged to be fully charged. The remaining power at this time is the remaining power after the battery is fully charged.

[0075] Here, the battery charging time, i.e., the third time, is calculated based on the battery capacity and the battery charging current threshold, using the following formula:

[0076]

[0077] Optionally, the method further includes:

[0078] Obtain the remaining battery level while the vehicle is in a wake-up state;

[0079] When the remaining battery power is less than the charging start threshold, the vehicle is guided to receive high voltage and the battery is controlled to enter the charging state.

[0080] Here, when the vehicle is in sleep mode, the IBS monitors the battery in real time and calculates the current remaining battery power and battery health status. When the remaining battery power is less than the low battery power wake-up threshold, the IBS wakes up the vehicle. The vehicle is in wake-up mode, and the IBS sends the remaining battery power to the BCM via the LIN bus. The BCM then sends it to the VCU via the CAN bus. After the vehicle enters wake-up mode, the VCU obtains the remaining battery power. When the remaining battery power is less than the charging start threshold, the VCU guides the vehicle to high voltage and controls the DC-DC converter to charge the battery, and the battery enters charging mode.

[0081] Specifically, when the remaining battery power is less than the charging start threshold, the vehicle's high voltage is energized, and the battery is controlled to enter the charging state, including:

[0082] When the remaining battery power is less than the charging start threshold, the vehicle door lock status and the power battery status are detected.

[0083] Based on the vehicle's door lock status and the power battery status, the system guides the vehicle to receive high-voltage power and controls the battery to enter a charging state through a DC-DC converter.

[0084] It should be noted that the BMS detects the status of the power battery and sends the power battery status information to the VCU via the CAN line. The VCU detects the status of the vehicle door locks and makes a judgment based on the power battery status information. When it determines that the conditions for high-voltage power-on of the vehicle are met, it outputs a smart charging enable flag, thereby guiding the vehicle to high-voltage power-on and controlling the DC-DC converter to charge the battery.

[0085] Optionally, the method further includes:

[0086] When the battery is fully charged, control the battery to exit the charging state and guide the vehicle to shut down the high voltage.

[0087] It should be noted that once the battery is determined to be fully charged, it should be promptly deactivated from the charging state to avoid additional energy consumption, reduce vehicle power consumption, effectively extend battery life, and improve user experience.

[0088] It should also be noted that, such as Figure 3 As shown, the steps of the battery charging control method according to an embodiment of the present invention are described as follows:

[0089] Step 301: The vehicle is in a high-voltage power-on state, at which time the battery enters the charging state;

[0090] Step 302: Determine whether the battery charging current acquisition status is normal.

[0091] Step 303: If the judgment result of step 302 is yes, determine whether the temperature acquisition status of the battery is normal.

[0092] Step 304: If the judgment result of step 302 is negative, determine whether the remaining power of the battery remains unchanged during the third time period;

[0093] Step 305: If the judgment result of step 303 is yes, determine whether the temperature of the battery is greater than the first temperature threshold.

[0094] Step 306: If the judgment result of step 305 is yes, determine whether the charging current of the battery is continuously less than the first current threshold within the first time period.

[0095] Step 307: If the judgment result of step 303 or step 305 is negative, determine whether the charging current of the battery is continuously less than the first current threshold during the first time period after the second charging time.

[0096] Step 308: Determine that the battery is fully charged when one of the following conditions is met;

[0097] The result of step 304 is yes;

[0098] The result of step 306 is yes;

[0099] The result of step 307 is yes;

[0100] Step 309: Determine that the battery is not fully charged if any of the following conditions are met;

[0101] The result of step 304 is no;

[0102] The result of step 306 is no;

[0103] The result of step 307 is negative.

[0104] This invention also provides a battery charging control device, comprising:

[0105] The judgment module is used to determine whether the battery is fully charged when the battery is in the charging state, based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining capacity, the temperature, and the charging time.

[0106] In this embodiment of the invention, when the battery is in a charging state, the system determines whether the battery is fully charged based on at least one of the following: the current charging current acquisition status, the temperature acquisition status, the charging current, the remaining power, the temperature, and the charging time. This maximizes the chances of the battery being fully charged, avoids the risk of power loss, effectively extends the battery's lifespan, and improves the user experience.

[0107] Optionally, the determination module includes:

[0108] The first judgment unit is used to determine whether the battery is fully charged based on the temperature acquisition status, charging current and charging time when the charging current acquisition status is normal.

[0109] The second judgment unit is used to determine whether the battery is fully charged based on the remaining power and the charging time when the charging current acquisition status is abnormal.

[0110] Optionally, the first determination unit is specifically used for:

[0111] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is greater than the first temperature threshold and the charging current is continuously less than the first current threshold within the first time period, the battery is determined to be in a fully charged state.

[0112] When the charging current acquisition status is normal and the temperature acquisition status is normal, if the temperature is less than or equal to the first temperature threshold, and after the second time, the charging current is continuously less than the first current threshold in the first time, the battery is determined to be fully charged.

[0113] If the charging current acquisition status is normal and the temperature acquisition status is abnormal, and if, after the second time, the charging current is continuously less than the first current threshold during the first time period, the battery is determined to be fully charged.

[0114] Optionally, the second determination unit is specifically used for:

[0115] If the remaining charge remains unchanged within the third time period, the battery is considered to be fully charged.

[0116] Optionally, the device further includes:

[0117] The acquisition module is used to acquire the remaining battery power when the vehicle is in a wake-up state;

[0118] The first control module is used to guide the vehicle's high voltage to power on and control the battery to enter the charging state when the remaining power is less than the charging start threshold.

[0119] Optionally, the first control module is specifically used for:

[0120] When the remaining battery power is less than the charging start threshold, the vehicle door lock status and the power battery status are detected.

[0121] Based on the vehicle door lock status and the power battery status, the vehicle is guided to receive high-voltage power, and the battery is controlled to enter the charging state through the DC-DC conversion unit.

[0122] Optionally, the device further includes:

[0123] The second control module is used to control the battery to exit the charging state and guide the vehicle to shut down the high voltage when the battery is fully charged.

[0124] It should be noted that the battery charging control device provided in the embodiments of the present invention is a device capable of executing the above-described battery charging control method. Therefore, all embodiments of the above-described battery charging control method are applicable to this device and can achieve the same or similar technical effects.

[0125] This invention also provides an electric vehicle, including the battery charging control device described above.

[0126] It should be noted that the electric vehicle provided in the embodiments of the present invention includes the battery charging control device described above, and has the same technical effect, which will not be repeated here.

[0127] This invention also provides a readable storage medium storing a program that, when executed by a processor, implements the battery charging control method described above.

[0128] The processor mentioned above is the processor in the electric vehicle described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0129] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A storage battery charge control method applied to a vehicle control unit, characterized by, The method comprises: In the case that the battery enters a charging state, at least one of the current charging current acquisition state, the temperature acquisition state, the charging current, the remaining power, the temperature and the charging time of the battery is acquired to determine whether the battery is in a full charge state; In the case that the battery enters a charging state, at least one of the current charging current acquisition state, the temperature acquisition state, the charging current, the remaining power, the temperature and the charging time of the battery is acquired to determine whether the battery is in a full charge state; In the case that the charging current acquisition state is normal, the temperature acquisition state, the charging current and the charging time are acquired to determine whether the battery is in a full charge state; In the case that the charging current acquisition state is abnormal, the remaining power and the charging time are acquired to determine whether the battery is in a full charge state; In the case that the charging current acquisition state is normal, the temperature acquisition state, the charging current and the charging time are acquired to determine whether the battery is in a full charge state, comprising: In the case that the charging current acquisition state is normal and the temperature acquisition state is normal, when the temperature is greater than a first temperature threshold value, and the charging current is less than a first current threshold value for a first time, it is determined that the battery is in a full charge state; In the case that the charging current acquisition state is normal and the temperature acquisition state is normal, when the temperature is less than or equal to the first temperature threshold value, and the charging current is less than the first current threshold value for the first time after a second time, it is determined that the battery is in a full charge state; In the case that the charging current acquisition state is normal and the temperature acquisition state is abnormal, and the charging current is less than the first current threshold value for the first time after a second time, it is determined that the battery is in a full charge state; In the case that the charging current acquisition state is abnormal, the remaining power and the charging time are acquired to determine whether the battery is in a full charge state, comprising: When the remaining power remains unchanged for a third time, it is determined that the battery is in a full charge state.

2. The storage battery charge control method according to claim 1, characterized by, The method further comprises: When the vehicle is in an awake state, the remaining power is acquired; When the remaining power is less than a charging start threshold value, the vehicle is guided to be powered on at high voltage, and the battery is controlled to enter a charging state.

3. The storage battery charge control method according to claim 2, characterized by, When the remaining power is less than a charging start threshold value, the vehicle is guided to be powered on at high voltage, and the battery is controlled to enter a charging state, comprising: When the remaining power is less than a charging start threshold value, the vehicle body door lock state and the power battery state are detected; According to the vehicle body door lock state and the power battery state, the vehicle is guided to be powered on at high voltage, and the battery is controlled to enter a charging state through a direct current conversion unit.

4. The storage battery charge control method according to claim 1, characterized by, The method further comprises: When the battery is in a full charge state, the battery is controlled to exit a charging state, and the vehicle is guided to be powered down at high voltage.

5. A battery charge control device characterized by comprising: A battery charging control method for implementing any one of claims 1 to 4, comprising: a judging module, configured to judge whether the battery is in a full-charge state according to at least one of a current charging current acquisition state, a temperature acquisition state, a charging current, a remaining power, a temperature and a charging time of the battery when the battery enters a charging state.

6. An electric vehicle, characterized by The battery charging control device of claim 5.

7. A readable storage medium, characterized by, A readable storage medium, in which a program is stored, and the program is executed by a processor to implement the battery charging control method of any one of claims 1 to 4.

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