Electric vehicle power supply device, method and electric vehicle

Abstract

The present invention relates to the field of electric vehicles and provides an electric vehicle power supply device, method, and electric vehicle. The device includes: a first switch device, a second switch device, and a low-voltage battery, a control unit, and a DC-DC converter integrated into the same housing. The first switch device and the DC-DC converter are disposed in a first power supply circuit of the low-voltage battery, and the second switch device and the control unit are disposed in a second power supply circuit of the low-voltage battery. The control unit is configured to control the first switch device to close when the second power supply circuit is conductive and the low-voltage battery meets power supply conditions. The control unit is further configured to detect operating parameter data of the low-voltage battery and control the opening and closing of the DC-DC converter based on the operating parameter data. When the DC-DC converter is turned on, it is configured to convert the output voltage of the power battery into the charging voltage of the low-voltage battery. The present invention can ensure the reliability of low-voltage battery charging and significantly reduce the cost of electric vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to an electric vehicle power supply device, method and electric vehicle. Background Art

[0002] Electric vehicles are experiencing rapid growth due to their environmentally friendly, energy-efficient, and low-noise advantages. The power source for an electric vehicle typically consists of a power battery and a low-voltage storage battery. The low-voltage storage battery provides power for all low-voltage systems and communication signals, while the power battery also provides power for the electric vehicle. Simultaneously, the power battery charges the low-voltage storage battery via a DCDC (Direct Current Direct Current) converter.

[0003] The DC-DC converters used in existing electric vehicle power supply systems are typically integrated within an all-in-one unit. The DC-DC converters and low-voltage batteries are independently controlled by separate control boards, which communicate via a bus. This results in significant signal transmission and reception delays, and in the event of a bus failure, signal transmission and reception cannot proceed normally, making it impossible to reliably charge the low-voltage battery. This significantly increases the cost of electric vehicles. Summary of the Invention

[0004] The present invention provides an electric vehicle power supply device, method and electric vehicle, which are used to solve the defects in the prior art that the reliability of low-voltage battery charging cannot be guaranteed and the cost of electric vehicles is high, and effectively improve the reliability of low-voltage battery charging and effectively reduce the cost of electric vehicles.

[0005] The present invention provides an electric vehicle power supply device, comprising: a first switch device, a second switch device, and a low-voltage battery, a control unit, and a DCDC converter integrated in the same box;

[0006] The first switching device and the DCDC converter are arranged in a first power supply circuit of the low-voltage battery, and the first switching device is used to control the on-off of the first power supply circuit; the first power supply circuit is used to supply power to the DCDC converter and the low-voltage electrical equipment of the electric vehicle;

[0007] The second switch device and the control unit are arranged in a second power supply circuit of the low-voltage battery, the second switch device is used to control the on and off of the second power supply circuit; the second power supply circuit is used to supply power to the control unit;

[0008] The control unit is signal-connected to the first switching device and the DCDC converter, and is configured to control the first switching device to close when the second power supply circuit is turned on and it is determined that the low-voltage battery meets the power supply conditions; and is further configured to detect operating parameter data of the low-voltage battery and control the opening and closing of the DCDC converter based on the operating parameter data;

[0009] The DCDC converter is also connected to the power battery of the electric vehicle. When the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0010] According to the electric vehicle power supply device provided by the present invention, the low-voltage battery is provided with a voltage acquisition device, a current acquisition device and a temperature acquisition device;

[0011] The voltage acquisition device, the current acquisition device and the temperature acquisition device are used to respectively acquire the operating voltage, operating current and operating temperature of the low-voltage battery;

[0012] The control unit is connected to the voltage acquisition device, the current acquisition device and the temperature acquisition device, and is used to obtain the operating voltage, operating current and operating temperature of the low-voltage battery when the second power supply circuit is turned on; and is also used to determine whether the low-voltage battery meets the power supply conditions based on the operating voltage, operating current and operating temperature of the low-voltage battery.

[0013] According to the electric vehicle power supply device provided by the present invention, the control unit is also connected to the heating device and the cooling device of the low-voltage battery;

[0014] The control unit is used to control the opening and closing of the heating device and the cooling device according to the operating temperature of the low-voltage battery; and is also used to control the magnitude of the operating current based on the operating temperature.

[0015] According to the electric vehicle power supply device provided by the present invention, the control unit is further used for:

[0016] When the second power supply circuit is turned on, controlling the low-voltage battery to perform a self-test;

[0017] When it is determined according to the self-test result of the low-voltage battery that the low-voltage battery has no fault, the operating voltage, operating current and operating temperature of the low-voltage battery are obtained; when it is determined according to the self-test result that the low-voltage battery has a fault, a fault prompt is given.

[0018] According to the electric vehicle power supply device provided by the present invention, the control unit is further used for:

[0019] When it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery that the low-voltage battery meets the charging condition, controlling the DCDC converter to turn on;

[0020] If the current state of the DCDC converter is on, and it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery that the low-voltage battery meets the charging stop condition, the DCDC converter is controlled to be off.

[0021] According to the electric vehicle power supply device provided by the present invention, the control unit is specifically used for:

[0022] Determining the remaining capacity of the low-voltage battery based on a corrected voltage and a corrected current of the low-voltage battery; wherein the corrected voltage and the corrected current are obtained by correcting the operating voltage and the operating current based on the operating temperature;

[0023] When it is determined that the remaining power meets the first preset condition or the corrected current meets the second preset condition, it is determined that the low-voltage battery meets the charging condition.

[0024] According to the electric vehicle power supply device provided by the present invention, the control unit is specifically used for:

[0025] When it is determined that the current state of the DCDC converter is on and the remaining power meets a third preset condition, it is determined that the low-voltage battery meets the charging stop condition.

[0026] According to the electric vehicle power supply device provided by the present invention, the control unit is further used for:

[0027] An ON signal of the electric vehicle is detected, and if the ON signal is not detected, the low-voltage battery is controlled to enter a sleep mode.

[0028] The present invention also provides a method for supplying power to an electric vehicle, comprising:

[0029] The control unit controls the first switch device to close when the second power supply circuit of the low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions; wherein the first switch device is arranged in the first power supply circuit of the low-voltage battery and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power the DCDC converter and the low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated into the same housing;

[0030] The control unit detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0031] The present invention also provides an electric vehicle, comprising any one of the electric vehicle power supply devices described above.

[0032] The electric vehicle power supply device, method, and electric vehicle provided by the present invention integrate a low-voltage battery, a control unit, and a DCDC converter into the same housing. When a second power supply circuit powered by the low-voltage battery to the control unit is turned on, the control unit determines whether the low-voltage battery meets the power supply conditions. If the power supply conditions are met, the control unit controls the closing of a first switching device to control the conduction of the first power supply circuit powered by the low-voltage battery to the DCDC converter and low-voltage electrical equipment, thereby achieving power supply control for the low-voltage battery. The control unit also detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data to charge the low-voltage battery when the DCDC converter is turned on, thereby achieving control of the DCDC converter, that is, achieving charging control for the low-voltage battery. Therefore, the control unit can achieve synchronous control of the low-voltage battery and the DCDC converter, eliminating the need for signal transmission and reception between the low-voltage battery and the DCDC converter, ensuring the reliability of low-voltage battery charging, and greatly reducing the cost of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is one of the structural diagrams of the electric vehicle power supply device provided by an embodiment of the present invention;

[0035] Figure 2 This is the second structural diagram of the electric vehicle power supply device provided by an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the working process of the electric vehicle power supply device provided by an embodiment of the present invention;

[0037] Figure 4 is a flow chart of a method for powering an electric vehicle provided by an embodiment of the present invention;

[0038] Figure 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention;

[0039] Reference numerals:

[0040] 101: First switch device; 102: Second switch device; 103: Low-voltage battery; 104: Control unit; 105: DCDC converter; 201: Current sensor; 202: Voltage acquisition harness; 203: Current acquisition harness; 204: Temperature acquisition harness. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0042] The following combination Figures 1 to 3 The electric vehicle power supply device of the present invention is described. The electric vehicle power supply device of the present invention is used to provide low voltage electricity for electric vehicles. Figure 1 As shown, the electric vehicle power supply device of the present invention comprises at least: a first switch device 101, a second switch device 102, and a low-voltage battery 103, a control unit 104 and a DCDC converter 105 integrated in the same box;

[0043] The first switching device 101 and the DCDC converter 105 are arranged in a first power supply circuit of the low-voltage battery 103, and the first switching device 101 is used to control the on / off of the first power supply circuit; the first power supply circuit is used to supply power to the DCDC converter 105 and the low-voltage electrical equipment of the electric vehicle;

[0044] The second switch device 102 and the control unit 104 are arranged in the second power supply circuit of the low-voltage battery 103, and the second switch device 102 is used to control the on and off of the second power supply circuit; the second power supply circuit is used to power the control unit 104;

[0045] The control unit 104 is signal-connected to the first switching device 101 and the DCDC converter 105, and is configured to control the first switching device 101 to close when the second power supply circuit is turned on and it is determined that the low-voltage battery 103 meets the power supply conditions; and is further configured to detect operating parameter data of the low-voltage battery 103 and control the opening and closing of the DCDC converter 105 based on the operating parameter data;

[0046] The DCDC converter 105 is also connected to the power battery of the electric vehicle. When the DCDC converter 105 is turned on, it is used to convert the output voltage of the power battery into a charging voltage for the low-voltage battery 103 .

[0047] In this embodiment, the low-voltage battery 103 is used to power the low-voltage electrical equipment of the electric vehicle, for example, it can be a 24V low-voltage lithium battery. The power battery is used to provide a power source for the electric vehicle, and at the same time, the low-voltage battery 103 is charged through the DCDC converter 105. The DCDC converter 105 is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery 103 to charge the low-voltage battery 103. The control unit 104 is used to control the power supply process and the charging process of the low-voltage battery 103. The low-voltage battery 103, the control unit 104 and the DCDC converter 105 are integrated in the same box. For example, the low-voltage battery 103, the control unit 104 and the DCDC converter 105 can be integrated into a non-standard box. The non-standard box can be individually numbered and assembled to the position closest to the frame to minimize the low-voltage line. The low-voltage battery 103 and the DCDC converter 105 of a traditional electric vehicle are connected via a 25-square-meter power cable, which greatly increases the cost and weight. At the same time, the power cable has high requirements for dust and water resistance. The low-voltage battery 103 and the DCDC converter 105 of a traditional electric vehicle connected via a 25-square-meter power cable cannot guarantee the reliability of the charging of the low-voltage battery 103. This embodiment integrates the low-voltage battery 103 and the DCDC converter 105 into the same box, and the connection between the low-voltage battery 103 and the DCDC converter 105 can be achieved through a copper busbar, thereby effectively reducing the cost and weight of the electric vehicle and improving the reliability of the charging of the low-voltage battery 103.

[0048] The electric vehicle power supply device of this embodiment further includes a first switching device 101 and a second switching device 102. The first switching device 101 and the DC-DC converter 105 are both disposed in a first power supply circuit of a low-voltage battery 103. The first switching device 101 is used to control the on / off of the first power supply circuit, which is used to power the DC-DC converter 105 and the low-voltage electrical equipment of the electric vehicle. In actual use, when the first switching device 101 is closed, the first power supply circuit is on, and power is supplied to the DC-DC converter 105 and the low-voltage electrical equipment via the low-voltage battery 103. When the first switching device 101 is opened, the first power supply circuit is disconnected, and the low-voltage battery 103 stops supplying power to the DC-DC converter 105 and the low-voltage electrical equipment. The first switching device 101 can be a relay switch, with the on / off control of the first switching device 101 by a control unit 104.

[0049] The second switching device 102 and the control unit 104 are both disposed in the second power supply circuit of the low-voltage battery 103. The second switching device 102 is used to control the conduction and disconnection of the second power supply circuit, which is used to power the control unit 104. In actual use, when the second switching device 102 is closed, the second power supply circuit is turned on, and power is supplied to the control unit 104 via the low-voltage battery 103, causing the control unit 104 to enter a standby mode. When the second switching device 102 is disconnected, the low-voltage battery 103 stops supplying power to the control unit 104, causing the control unit 104 to cease operation. Simultaneously, the control unit 104 stops outputting electrical signals to the first switching device 101, causing the first switching device 101 to lose power and disconnect. The low-voltage battery 103 stops supplying power to the DC-DC converter 105 and low-voltage electrical equipment, thereby preventing the electric vehicle from starting due to undervoltage in the low-voltage battery 103 when the electric vehicle is parked for an extended period of time. The second switching device 102 can be a manually controlled switch, for example, a self-resetting switch that closes when pressed for 3 seconds and opens when pressed for 5 seconds.

[0050] The DCDC converter 105 is also connected to the power battery of the electric vehicle. When the DCDC converter 105 is turned on, the output voltage of the power battery is converted into the charging voltage of the low-voltage battery 103, that is, 24V voltage, through the DCDC converter 105 to charge the low-voltage battery 103; when the DCDC converter 105 is turned off, charging of the low-voltage battery 103 is stopped.

[0051] The control unit 104 is signal-connected to the first switching device 101 and the DCDC converter 105. When the second power supply circuit is turned on, the control unit 104 can determine whether the low-voltage battery 103 meets the power supply conditions. For example, the low-voltage battery 103 can be controlled to perform a self-test. If there is no fault in the self-test, it indicates that the power supply conditions are met. The operating parameter data of the low-voltage battery 103 can also be detected. When the operating parameter data is within a preset range, it is determined that the low-voltage battery 103 meets the power supply conditions. The low-voltage battery 103 can also be determined to meet the power supply conditions when there is no fault in the self-test and the operating parameter data is within a preset range.

[0052] When it is determined that the low-voltage battery 103 meets the power supply condition, the first switch device 101 is controlled to be closed to make the first power supply circuit conductive, so that the DCDC converter 105 and the low-voltage electrical equipment can be powered by the low-voltage battery 103. During the process of the low-voltage battery 103 supplying power to the DCDC converter 105 and the low-voltage electrical equipment, it is also possible to determine whether the low-voltage battery 103 meets the charging conditions based on the real-time detected working parameter data, and control the DCDC converter 105 to turn on when the charging conditions are met to charge the low-voltage battery 103. During the charging process, it is also possible to determine whether the low-voltage battery 103 meets the charging stop conditions based on the real-time detected working parameter data, and control the DCDC converter 105 to turn off when the charging stop conditions are met to stop charging the low-voltage battery 103. In this way, the control unit 104 can achieve synchronous control of the low-voltage battery 103 and the DCDC converter 105. No signal transmission and reception is required between the low-voltage battery 103 and the DCDC converter 105, and there is no delay in signal transmission and reception, nor is there an impact of bus faults on signal transmission and reception. This ensures the reliability of charging of the low-voltage battery 103 and greatly reduces the cost of the electric vehicle.

[0053] Thus, it can be seen that in this embodiment, the low-voltage battery 103, the control unit 104 and the DCDC converter 105 are integrated into the same housing. When the second power supply circuit from the low-voltage battery 103 to the control unit 104 is turned on, the control unit 104 determines whether the low-voltage battery 103 meets the power supply conditions, and controls the first switching device 101 to close when the power supply conditions are met, so as to control the first power supply circuit from the low-voltage battery 103 to power the DCDC converter 105 and the low-voltage electrical equipment to be turned on, thereby realizing power supply control of the low-voltage battery 103; the control unit 104 also detects the operating parameter data of the low-voltage battery 103, and controls the opening and closing of the DCDC converter 105 based on the operating parameter data, so as to charge the low-voltage battery 103 when the DCDC converter 105 is turned on, thereby realizing control of the DCDC converter 105, that is, realizing charging control of the low-voltage battery 103. Therefore, the control unit 104 can achieve synchronous control of the low-voltage battery 103 and the DCDC converter 105, without the need for signal transmission and reception between the low-voltage battery 103 and the DCDC converter 105, thereby ensuring the reliability of charging the low-voltage battery 103 and greatly reducing the cost of the electric vehicle.

[0054] In an exemplary embodiment, the low-voltage battery 103 is provided with a voltage acquisition device, a current acquisition device, and a temperature acquisition device;

[0055] The voltage acquisition device, the current acquisition device and the temperature acquisition device are used to respectively acquire the operating voltage, operating current and operating temperature of the low-voltage battery 103;

[0056] The control unit 104 is connected to the voltage acquisition device, the current acquisition device and the temperature acquisition device, and is used to obtain the operating voltage, operating current and operating temperature of the low-voltage battery 103 when the second power supply circuit is turned on; and is also used to determine whether the low-voltage battery 103 meets the power supply conditions based on the operating voltage, operating current and operating temperature of the low-voltage battery 103.

[0057] In this embodiment, the operating parameter data of the low-voltage battery 103 may include operating voltage, operating current, and operating temperature. Specifically, a voltage acquisition device, a current acquisition device, and a temperature acquisition device may be provided on the low-voltage battery 103. The voltage acquisition device, the current acquisition device, and the temperature acquisition device may respectively employ a voltage sensor, a current sensor, and a temperature sensor to respectively acquire the operating voltage, operating current, and operating temperature of the low-voltage battery 103. The operating voltage refers to the output voltage of the low-voltage battery 103, the operating current refers to the discharge current of the low-voltage battery 103, and the operating temperature refers to the temperature of the low-voltage battery 103.

[0058] The control unit 104 is connected to the voltage acquisition device, the current acquisition device, and the temperature acquisition device through the voltage acquisition harness, the current acquisition harness, and the temperature acquisition harness, respectively, and is used to obtain the operating voltage, operating current, and operating temperature of the low-voltage battery 103 when the second power supply circuit is turned on, and determine whether the low-voltage battery 103 meets the power supply conditions based on the operating voltage, operating current, and operating temperature. If the low-voltage battery 103 meets the power supply conditions, the first switching device 101 is controlled to be closed; otherwise, the first switching device 101 is not controlled to be closed, that is, the first switching device 101 remains disconnected.

[0059] Among them, the specific method by which the control unit 104 determines whether the low-voltage battery 103 meets the power supply conditions based on the operating voltage, operating current, and operating temperature can be set according to actual needs. For example, it can determine whether the operating voltage, operating current, and operating temperature are within a preset range. If the operating voltage, operating current, and operating temperature are all within the preset range, it is determined that the low-voltage battery 103 meets the power supply conditions and the first switching device 101 is controlled to be closed. Otherwise, it is determined that the low-voltage battery 103 does not meet the power supply conditions and the first switching device 101 continues to remain open. At the same time, when it is determined that the low-voltage battery 103 does not meet the power supply conditions, the control unit 104 can also provide relevant prompts and / or perform corresponding control on the heating device or cooling device of the low-voltage battery 103 to ensure the safety of the low-voltage battery 103 during the power supply process.

[0060] In an exemplary embodiment, the control unit 104 is also connected to a heating device and a cooling device of the low-voltage battery 103;

[0061] The control unit 104 is used to control the opening and closing of the heating device and the cooling device according to the operating temperature of the low-voltage battery 103; and is also used to control the magnitude of the operating current based on the operating temperature.

[0062] In this embodiment, the control unit 104 can also be connected to the heating device and cooling device of the low-voltage battery 103 by signal. The control unit 104 controls the opening and closing of the heating device and the cooling device according to the operating temperature of the low-voltage battery 103. For example, when the operating temperature of the low-voltage battery 103 is greater than a first preset temperature value, the cooling device can be controlled to be turned on. When the operating temperature of the low-voltage battery 103 is less than a second preset temperature value, the heating device can be controlled to be turned on. This prevents the low temperature from affecting the discharge performance of the low-voltage battery 103 and the high temperature from damaging the low-voltage battery 103. This effectively improves the service life of the low-voltage battery 103 and ensures the operating performance of the low-voltage battery 103. The first preset temperature value is greater than the second preset temperature value.

[0063] In addition, the control unit 104 can also control the magnitude of the discharge current (i.e., the operating current) of the low-voltage battery 103 based on the operating temperature of the low-voltage battery 103. For example, when the operating temperature of the low-voltage battery 103 is greater than a third preset temperature value, a target value of the discharge current of the low-voltage battery 103 can be determined based on the magnitude of the operating temperature of the low-voltage battery 103, so as to limit the discharge current of the low-voltage battery 103 according to the target value of the discharge current. The target value of the discharge current of the low-voltage battery 103 can be determined based on the corresponding relationship between the preset operating temperature and the discharge current, thereby further improving the safety of the low-voltage battery 103 during power supply.

[0064] In an exemplary embodiment, the control unit 104 is further configured to:

[0065] When the second power supply circuit is turned on, controlling the low-voltage battery 103 to perform a self-test;

[0066] When it is determined according to the self-test result of the low-voltage battery 103 that the low-voltage battery 103 has no fault, the operating voltage, operating current and operating temperature of the low-voltage battery 103 are obtained; when it is determined according to the self-test result that the low-voltage battery 103 has a fault, a fault prompt is given.

[0067] In this embodiment, when the second power supply circuit is turned on, the control unit 104 can control the low-voltage battery 103 to perform a self-test, and determine whether the low-voltage battery 103 is faulty based on the self-test result of the low-voltage battery 103. When the low-voltage battery 103 is faulty, a fault prompt is given. For example, the fault light can be controlled to light up to remind the operator to troubleshoot the fault. The fault prompt information can also be sent to the vehicle controller and / or the central control screen of the electric vehicle via the CAN bus. When the low-voltage battery 103 is not faulty, the operating voltage, operating current and operating temperature of the low-voltage battery 103 can be further obtained to determine whether the low-voltage battery 103 meets the power supply conditions based on the operating voltage, operating current and operating temperature. Thus, through double detection, the safety of the low-voltage battery 103 during power supply is further improved.

[0068] In an exemplary embodiment, the control unit 104 is further configured to:

[0069] When it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery 103 that the low-voltage battery 103 meets the charging condition, controlling the DCDC converter 105 to turn on;

[0070] If the current state of the DCDC converter 105 is on, and it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery 103 that the low-voltage battery 103 meets the charging stop condition, the DCDC converter 105 is controlled to be off.

[0071] In this embodiment, the control unit 104 further determines whether the low-voltage battery 103 meets the charging condition based on the operating voltage, operating current, and operating temperature of the low-voltage battery 103. For example, the operating voltage and operating current may be corrected according to the operating temperature to obtain a corrected voltage and corrected current, and the remaining power of the low-voltage battery 103 is calculated based on the corrected voltage and corrected current to determine whether the low-voltage battery 103 meets the charging condition based on the remaining power. At the same time, when determining whether the low-voltage battery 103 meets the charging condition, the discharge current of the low-voltage battery 103, that is, the operating current of the low-voltage battery 103, may also be considered to determine whether the low-voltage battery 103 meets the charging condition based on the remaining power or operating current of the low-voltage battery 103. When the low-voltage battery 103 does not meet the charging conditions, there is no need to control the DCDC converter 105 to turn on. When the charging conditions are met, the DCDC converter 105 is controlled to turn on. For example, the DCDC converter 105 and the DCDC high-voltage distribution circuit can be awakened by a bus instruction to convert the output voltage of the power battery into the charging voltage of the low-voltage battery 103 through the DCDC converter 105 to charge the low-voltage battery 103.

[0072] The current state of the DCDC converter 105 refers to the on / off state of the DCDC converter 105 at the current moment. When the current state of the DCDC converter 105 is on, the low-voltage battery 103 is in a charging state. During the charging process of the low-voltage battery 103, the remaining power of the low-voltage battery 103 can also be calculated in real time based on the real-time collected operating voltage, operating current, and operating temperature. Based on the remaining power, it is determined whether the low-voltage battery 103 meets the charging stop condition. If the charging stop condition is not met, the low-voltage battery 103 continues to be charged. When the charging stop condition is met, the DCDC converter 105 is controlled to be turned off to stop charging the low-voltage battery 103. For example, the DCDC converter 105 and the DCDC high-voltage power distribution circuit can be controlled to be turned off via bus instructions.

[0073] After power is applied to a conventional electric vehicle, the DCDC converter 105 operates continuously to supply power to the entire vehicle, meeting the vehicle's power needs while simultaneously charging the low-voltage battery 103. This does not guarantee the lifespan of the DCDC converter 105. Furthermore, prolonged inefficient operation of the DCDC converter 105 results in energy consumption, making it impossible to guarantee the electric vehicle's range. However, the embodiments of the present invention control the on / off switching of the DCDC converter 105 in real time based on the operating voltage, current, and temperature of the low-voltage battery 103. This allows the DCDC converter 105 to be turned on when charging is required and turned off when charging is complete, thereby ensuring the lifespan of the DCDC converter 105. Furthermore, this effectively prevents inefficient operation of the DCDC converter 105, thereby reducing energy consumption and increasing the electric vehicle's range.

[0074] In an exemplary embodiment, the control unit 104 is specifically configured to:

[0075] Determining the remaining capacity of the low-voltage battery 103 based on the corrected voltage and corrected current of the low-voltage battery 103; wherein the corrected voltage and the corrected current are obtained by correcting the operating voltage and the operating current based on the operating temperature;

[0076] When it is determined that the remaining power meets the first preset condition or the corrected current meets the second preset condition, it is determined that the low-voltage battery 103 meets the charging condition.

[0077] In this embodiment, the control unit 104 can calculate the remaining power of the low-voltage battery 103 based on the corrected voltage and corrected current of the low-voltage battery 103 in the process of determining whether the low-voltage battery 103 meets the charging conditions based on the operating voltage, operating current and operating temperature of the low-voltage battery 103. For example, the product of the corrected voltage and the corrected current can be integrated to obtain the power consumption, and the remaining power of the low-voltage battery 103 can be obtained based on the difference between the initial power and the power consumption.

[0078] Among them, the corrected voltage and corrected current are obtained by correcting the operating voltage and operating current based on the operating temperature. For example, for the operating voltage, operating current, and operating temperature collected at any moment, a first correction coefficient for the operating voltage and a second correction coefficient for the operating current can be determined based on the operating temperature. The operating voltage is multiplied by the first correction coefficient to obtain the corrected voltage at that moment, and the operating current is multiplied by the second correction coefficient to obtain the corrected current at that moment. This ensures the accuracy of the corrected voltage and corrected current, and thus ensures the accuracy of the charging condition determination result, thereby effectively avoiding the occurrence of incorrect charging when charging is not required and not charging when charging is required, thereby improving the operating performance of the low-voltage battery 103 while ensuring the service life of the low-voltage battery 103.

[0079] After determining the remaining power, if it is determined that the remaining power meets the first preset condition, or the corrected current meets the second preset condition, it indicates that the low-voltage battery 103 meets the charging condition, and the DCDC converter 105 is controlled to turn on to charge the low-voltage battery 103. Otherwise, it indicates that the low-voltage battery 103 does not meet the charging condition. The first preset condition and the second preset condition can be set according to actual needs. For example, the first preset condition can be less than 30% of the rated power of the low-voltage battery 103, and the second preset condition can be greater than 20A.

[0080] This embodiment further improves the reliability of charging by comprehensively considering the remaining power and discharge current of the low-voltage battery 103 in the process of determining whether the low-voltage battery 103 meets the charging conditions, thereby effectively improving the working performance of the low-voltage battery 103 while ensuring the service life of the low-voltage battery 103.

[0081] In an exemplary embodiment, the control unit 104 is specifically configured to:

[0082] When it is determined that the current state of the DCDC converter 105 is on and the remaining power meets a third preset condition, it is determined that the low-voltage battery 103 meets the charging stop condition.

[0083] In this embodiment, the control unit 104 further determines whether the low-voltage battery 103 meets the charging stop condition during the charging process of the low-voltage battery 103, and when it is determined that the current state of the DCDC converter 105 is on and the remaining power of the low-voltage battery 103 meets the third preset condition, it is determined that the low-voltage battery 103 meets the charging stop condition, and controls the DCDC converter 105 to be turned off, so that the DCDC converter 105 can be turned off in time when the charging of the low-voltage battery 103 is completed, further reducing the electric energy consumed by the DCDC converter 105, and achieving an increase in the cruising range of the electric vehicle.

[0084] The third preset condition can be set according to actual needs, for example, it can be greater than or equal to 95% of the rated power of the low-voltage battery 103 .

[0085] In an exemplary embodiment, the control unit 104 is further configured to:

[0086] Detecting the ON signal of the electric vehicle, and if the ON signal is not detected, controlling the low-voltage battery 103 to enter a sleep mode.

[0087] In this embodiment, the control unit 104 is also used to detect the ON signal of the electric vehicle. The ON signal can be used to determine whether the electric vehicle is in the ON gear. If the ON signal is detected, it indicates that the electric vehicle is in the ON gear, that is, it is in the power-on state, and the low-voltage battery 103 can be controlled to provide low-voltage electricity normally; if the ON signal is not detected, it indicates that the electric vehicle is not powered on, and the low-voltage battery 103 can be controlled to enter a sleep mode to reduce power loss and effectively increase the cruising range of the electric vehicle. Among them, when controlling the low-voltage battery 103 to enter the sleep mode, the operating voltage, operating current and operating temperature of the low-voltage battery 103 can be detected in real time, so that the low-voltage battery 103 can normally provide low-voltage power after the electric vehicle is powered on.

[0088] It is understood that the control unit 104 can detect the ON signal of the electric vehicle when the electric vehicle is powered on, so that the low-voltage battery 103 can normally provide low-voltage power after the electric vehicle is powered on. The control unit 104 can also detect the ON signal of the electric vehicle when the electric vehicle is powered off. If no ON signal is detected for a preset period of time, it indicates that the electric vehicle has been powered off successfully, and the low-voltage battery 103 is controlled to enter a sleep mode to reduce energy loss.

[0089] The following describes the specific structure and working mode of the electric vehicle power supply device of the present invention through an optional embodiment. Figure 2As shown, the electric vehicle power supply device includes: a first power supply circuit formed by a low-voltage battery 103, a first switching device 101 and a DCDC converter 105, so that when the first switching device 101 is closed, the DCDC converter 105 is powered by the low-voltage battery 103, and at the same time, the low-voltage electrical equipment is powered through the 24V positive output terminal and the 24V negative output terminal; it also includes a second power supply circuit formed by the low-voltage battery 103, a control unit 104 and a second switching device 102, so that when the second switching device 102 is closed, the control unit 104 is powered by the low-voltage battery 103; the DCDC converter 105 is connected to the power battery through the high-voltage input positive electrode and the high-voltage input negative electrode, and when the DCDC converter 105 is turned on, the output voltage of the power battery is converted into a 24V voltage to charge the low-voltage battery 103; the low-voltage battery 103 is provided with a voltage sensor, a current sensor 201 and a temperature sensor (the voltage sensor and the temperature sensor are arranged inside the low-voltage battery 103, Figure 2 The control unit 104 is connected to the voltage sensor, the current sensor 201, and the temperature sensor through the voltage acquisition harness 202, the current acquisition harness 203, and the temperature acquisition harness 204, respectively, to obtain the operating voltage, operating current, and operating temperature of the low-voltage battery 103; the control unit 104 is connected to the DCDC converter 105 signal through the CAN bus to control the DCDC converter 105 to be turned on and off.

[0090] The working process of the electric vehicle power supply device is as follows Figure 3As shown, it includes: when the vehicle needs electricity, the operator presses the second switch device 102 for three seconds, the second switch device 102 is closed, and the control unit 104 enters the preparation working mode; the control unit 104 controls the low-voltage battery 103 to perform self-inspection, and if there is a fault in the self-inspection, the fault light is turned on to prompt the fault, so that the operator can troubleshoot in time; if there is no fault in the self-inspection, the control unit 104 obtains the working voltage, working current and working temperature of the low-voltage battery 103 in real time, and controls the first switch device 101 to be closed when the working voltage, working current and working temperature all meet the preset range, and provides normal power to the entire vehicle through the low-voltage battery 103; at the same time, the control unit 104 detects the ON signal, and if no ON signal is detected, the low-voltage battery 103 is controlled to enter the low-power sleep mode, and the working voltage, working current and working temperature of the low-voltage battery 103 are collected in real time; if the ON signal is detected, the control unit 104 controls the low-voltage battery 103 to supply low voltage power, and the control unit 104 controls the low-voltage battery 103 to supply low voltage power during the power supply process. 104 can exchange data with the entire vehicle and the DCDC converter 105 through the CAN bus; the control unit 104 monitors and calculates the remaining power of the low-voltage battery 103 and the discharge current of the low-voltage battery 103 in real time. When the remaining power of the low-voltage battery 103 is less than 30% or the discharge current of the low-voltage battery 103 is greater than 20A, the control unit 104 wakes up the DCDC converter 105 and the DCDC high-voltage distribution circuit through a bus instruction. After being awakened, the DCDC converter 105 converts the output voltage of the power battery into 24V voltage to charge the low-voltage battery 103. Charging is stopped when the remaining power of the low-voltage battery 103 is greater than 95%; when the control unit 104 detects that the ON signal has no signal for more than 5 seconds, it controls the low-voltage battery 103 to enter a low-power sleep mode again; when the vehicle is parked for a long time, long pressing the second switch device 102 for five seconds will disconnect the second switch device 102, the control unit 104 will turn off the first switch device 101, and the low-voltage battery 103 will stop supplying power to the outside.

[0091] The following describes the electric vehicle power supply method provided by the present invention. The electric vehicle power supply method described below is based on the electric vehicle power supply device described above, and the two can be referenced to each other. Figure 4 As shown, the electric vehicle power supply method of the present invention at least includes:

[0092] S401. When the second power supply circuit of the low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions, the control unit controls the first switching device to close; wherein, the first switching device is arranged in the first power supply circuit of the low-voltage battery, and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power the DCDC converter and the low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated in the same box.

[0093] S402, the control unit detects the operating parameter data of the low-voltage battery, and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0094] In an exemplary embodiment, determining that the low-voltage battery meets the power supply condition includes:

[0095] obtaining the operating voltage, operating current, and operating temperature of the low-voltage battery when the second power supply circuit is turned on;

[0096] Whether the low-voltage battery meets the power supply condition is determined based on the operating voltage, operating current, and operating temperature of the low-voltage battery.

[0097] In an exemplary embodiment, the present invention further comprises:

[0098] The control unit controls the opening and closing of the heating device and the cooling device of the low-voltage battery according to the operating temperature of the low-voltage battery; and / or,

[0099] The control unit controls the magnitude of the operating current based on the operating temperature.

[0100] In an exemplary embodiment, the present invention further comprises:

[0101] The control unit controls the low-voltage battery to perform a self-test when the second power supply circuit is turned on;

[0102] When the control unit determines that the low-voltage battery has no fault according to the self-test result of the low-voltage battery, it obtains the operating voltage, operating current and operating temperature of the low-voltage battery; when it determines that the low-voltage battery has a fault according to the self-test result, it issues a fault prompt.

[0103] In an exemplary embodiment, the present invention further comprises:

[0104] The control unit controls the DCDC converter to turn on when determining that the low-voltage battery meets the charging condition based on the operating voltage, operating current and operating temperature of the low-voltage battery;

[0105] If the current state of the DCDC converter is on, and it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery that the low-voltage battery meets the charging stop condition, the DCDC converter is controlled to be off.

[0106] In an exemplary embodiment, determining that the low-voltage battery meets a charging condition includes:

[0107] Determining the remaining capacity of the low-voltage battery based on a corrected voltage and a corrected current of the low-voltage battery; wherein the corrected voltage and the corrected current are obtained by correcting the operating voltage and the operating current based on the operating temperature;

[0108] When it is determined that the remaining power meets the first preset condition or the corrected current meets the second preset condition, it is determined that the low-voltage battery meets the charging condition.

[0109] In an exemplary embodiment, determining that the low-voltage battery meets a charging stop condition includes:

[0110] When it is determined that the current state of the DCDC converter is on and the remaining power meets a third preset condition, it is determined that the low-voltage battery meets the charging stop condition.

[0111] In an exemplary embodiment, the present invention further comprises:

[0112] The control unit detects an ON signal of the electric vehicle, and controls the low-voltage battery to enter a sleep mode if the ON signal is not detected.

[0113] The present invention further provides an electric vehicle, comprising the electric vehicle power supply device as described in any one of the above embodiments.

[0114] In this embodiment, the electric vehicle may be a passenger car or a commercial vehicle, and the commercial vehicle may be an electric working machine, such as a crane, an excavator, and the like.

[0115] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5As shown, the electronic device may include: a processor (processor) 501, a communication interface (Communications Interface) 502, a memory (memory) 503 and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other via the communication bus 504. The processor 501 can call the logic instructions in the memory 503 to execute the electric vehicle power supply method, which includes: the control unit controls the first switching device to close when the second power supply circuit of the low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions; wherein the first switching device is arranged in the first power supply circuit of the low-voltage battery, and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power the DCDC converter and the low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated into the same box;

[0116] The control unit detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0117] In addition, the logic instructions in the above-mentioned memory 503 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0118] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the electric vehicle power supply method provided by the above methods, the method comprising: a control unit controls a first switching device to close when the second power supply circuit of the low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions; wherein the first switching device is arranged in the first power supply circuit of the low-voltage battery, and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power a DCDC converter and low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated into the same box;

[0119] The control unit detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0120] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the above-mentioned electric vehicle power supply method, the method comprising: a control unit controls a first switching device to close when a second power supply circuit of a low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions; wherein the first switching device is arranged in the first power supply circuit of the low-voltage battery, and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power a DCDC converter and low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated into the same housing;

[0121] The control unit detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

[0122] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0123] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 various embodiments of the present invention.

Claims

1. An electric vehicle power supply device, characterized in that: include: A first switch device, a second switch device, and a low-voltage battery, a control unit, and a DCDC converter integrated in the same box; The first switching device and the DCDC converter are arranged in a first power supply circuit of the low-voltage battery, and the first switching device is used to control the on-off of the first power supply circuit; the first power supply circuit is used to supply power to the DCDC converter and the low-voltage electrical equipment of the electric vehicle; The second switch device and the control unit are arranged in a second power supply circuit of the low-voltage battery, the second switch device is used to control the on and off of the second power supply circuit; the second power supply circuit is used to supply power to the control unit; The control unit is signal-connected to the first switching device and the DCDC converter, and is configured to control the first switching device to close when the second power supply circuit is turned on and it is determined that the low-voltage battery meets the power supply conditions; and is further configured to detect operating parameter data of the low-voltage battery and control the opening and closing of the DCDC converter based on the operating parameter data; The DCDC converter is also connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery; The low-voltage battery is provided with a voltage acquisition device, a current acquisition device and a temperature acquisition device; The voltage acquisition device, the current acquisition device and the temperature acquisition device are used to respectively acquire the operating voltage, operating current and operating temperature of the low-voltage battery; The control unit is connected to the voltage acquisition device, the current acquisition device and the temperature acquisition device, and is used to obtain the operating voltage, operating current and operating temperature of the low-voltage battery when the second power supply circuit is turned on; It is also used to determine whether the low-voltage battery meets the power supply condition based on the operating voltage, operating current and operating temperature of the low-voltage battery.

2. The electric vehicle power supply device according to claim 1, characterized in that: The control unit is also connected to the heating device and cooling device of the low-voltage battery; The control unit is used to control the opening and closing of the heating device and the cooling device according to the operating temperature of the low-voltage battery; and is also used to control the magnitude of the operating current based on the operating temperature.

3. The electric vehicle power supply device according to claim 1, characterized in that: The control unit is further configured to: When the second power supply circuit is turned on, controlling the low-voltage battery to perform a self-test; When it is determined according to the self-test result of the low-voltage battery that the low-voltage battery has no faults, obtaining the operating voltage, operating current and operating temperature of the low-voltage battery; When it is determined according to the self-test result that the low-voltage battery has a fault, a fault prompt is given.

4. The electric vehicle power supply device according to claim 1, characterized in that: The control unit is further configured to: When it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery that the low-voltage battery meets the charging condition, controlling the DCDC converter to turn on; If the current state of the DCDC converter is on, and it is determined based on the operating voltage, operating current and operating temperature of the low-voltage battery that the low-voltage battery meets the charging stop condition, the DCDC converter is controlled to be off.

5. The electric vehicle power supply device according to claim 4, characterized in that: The control unit is specifically used for: Determining the remaining capacity of the low-voltage battery based on a corrected voltage and a corrected current of the low-voltage battery; wherein the corrected voltage and the corrected current are obtained by correcting the operating voltage and the operating current based on the operating temperature; When it is determined that the remaining power meets the first preset condition or the corrected current meets the second preset condition, it is determined that the low-voltage battery meets the charging condition.

6. The electric vehicle power supply device according to claim 5, characterized in that: The control unit is specifically used for: When it is determined that the current state of the DCDC converter is on and the remaining power meets a third preset condition, it is determined that the low-voltage battery meets the charging stop condition.

7. The electric vehicle power supply device according to any one of claims 1 to 6, characterized in that: The control unit is further configured to: An ON signal of the electric vehicle is detected, and if the ON signal is not detected, the low-voltage battery is controlled to enter a sleep mode.

8. A method for supplying power to an electric vehicle, characterized in that: Applied to the electric vehicle power supply device according to any one of claims 1 to 7, the method comprises: The control unit controls the first switch device to close when the second power supply circuit of the low-voltage battery is turned on and it is determined that the low-voltage battery meets the power supply conditions; wherein the first switch device is arranged in the first power supply circuit of the low-voltage battery and is used to control the on and off of the first power supply circuit; the first power supply circuit is used to power the DCDC converter and the low-voltage electrical equipment of the electric vehicle; the second power supply circuit is used to power the control unit; the low-voltage battery, the control unit and the DCDC converter are integrated into the same housing; The control unit detects operating parameter data of the low-voltage battery and controls the opening and closing of the DCDC converter based on the operating parameter data; wherein, the DCDC converter is connected to the power battery of the electric vehicle, and when the DCDC converter is turned on, it is used to convert the output voltage of the power battery into the charging voltage of the low-voltage battery.

9. An electric vehicle, characterized in that: include: An electric vehicle power supply device according to any one of claims 1 to 7.

Images