Charging device of vehicle storage battery and vehicle comprising same

Abstract

The utility model provides a charging device of a vehicle storage battery and a vehicle comprising the charging device. The vehicle includes a battery pack including a plurality of batteries connected in series. The charging device comprises an input end, an output end and a voltage conversion circuit. The input end is connected with the storage battery pack and used for receiving output voltage of the storage battery pack; the output end is respectively connected with the plurality of storage batteries and is used for outputting voltage to one of the storage batteries; and the voltage conversion circuit is connected with the input end and the output end, and is used for converting the output voltage of the storage battery pack into the input voltage of one storage battery, so that the other storage batteries supply power to one storage battery in the storage battery pack. The storage battery pack comprises a plurality of storage batteries, and the voltage conversion circuit can convert the output voltage of the storage battery pack into the input voltage of one of the storage batteries, so that the batteries with high electric quantity in the storage battery pack can charge the batteries with low electric quantity, and vehicle faults caused by power shortage of the storage batteries are prevented.

Description

Technical Field

[0001] This application relates to the field of vehicle power technology, and more particularly to a battery charging device for a vehicle and a vehicle including the same. Background Technology

[0002] As automobiles become increasingly feature-rich, their reliance on electricity is becoming more and more significant. The performance of the vehicle's power system directly affects the overall stability and intelligence level of the vehicle.

[0003] In practical use, automotive power systems face numerous challenges, with low-voltage battery depletion being particularly prominent. Electric vehicles typically consist of two power systems: a high-voltage system and a low-voltage system. The low-voltage battery draws power from the high-voltage battery during startup or charging. However, the presence of numerous electronic control units significantly increases the quiescent current, and the complex wake-up mechanism causes the vehicle network to continuously consume battery power, leading to an overload on the low-voltage battery. When the battery voltage falls below the normal operating range, the vehicle cannot start, severely impacting user experience and damaging the reputation of electric vehicle manufacturers. Faults caused by low-voltage battery depletion resulting in vehicle startup failure account for a significant proportion of reported malfunctions in new energy vehicles. Utility Model Content

[0004] This application provides a battery charging device for a vehicle and a vehicle including the device, which can prevent vehicle malfunctions caused by a depleted battery.

[0005] This application provides a battery charging device for a vehicle, the vehicle including a battery pack, the battery pack including multiple batteries connected in series, and the charging device including:

[0006] The input terminal is connected to the battery pack and is used to receive the output voltage of the battery pack.

[0007] The output terminal is connected to the plurality of said batteries respectively, and is used to output voltage to one of said batteries;

[0008] A voltage conversion circuit, connected to the input terminal and the output terminal, is used to convert the output voltage of the battery pack into the input voltage of one of the batteries, so that one of the batteries in the battery pack is powered by the other batteries.

[0009] In some embodiments, the battery pack includes multiple batteries, and the voltage conversion circuit can convert the output voltage of the battery pack into the input voltage of one of the batteries, so that the batteries with higher charge in the battery pack can charge the batteries with lower charge, preventing the battery from being depleted and causing vehicle malfunction.

[0010] Optionally, the battery pack includes a first battery and a second battery connected in series, and the output terminal is connected to the first battery and the second battery respectively. The voltage conversion circuit is used to convert the output voltage of the battery pack into the input voltage of the first battery and / or the second battery, so that the first battery supplies power to the second battery, or the second battery supplies power to the first battery.

[0011] In some embodiments, the first battery and the second battery are connected in series and are respectively connected to a voltage conversion circuit. The voltage conversion circuit converts the output voltage of the battery pack into the input voltage of the first battery and / or the second battery, so that the battery with higher charge can charge the battery with lower charge, preventing the battery from being depleted and causing vehicle malfunction.

[0012] Optionally, the charging device includes a control circuit connected to the voltage conversion circuit, used to control the voltage conversion circuit to convert the output voltage of the battery pack into the input voltage of one of the batteries.

[0013] In some embodiments, the control circuit can control the voltage conversion circuit to convert the voltage, thereby enabling the battery pack to charge one of the batteries and prevent the battery from running out of power, which could lead to vehicle malfunction.

[0014] Optionally, the power replenishment device includes a voltage sensor connected between the control circuit and the plurality of batteries, respectively, for detecting the output voltage of the plurality of batteries.

[0015] In some embodiments, a voltage sensor can detect the output voltage of the battery, enabling the control circuit to acquire the battery's output voltage and charge it according to the specific conditions of the battery's output voltage, making charging more intelligent.

[0016] Optionally, the vehicle includes a vehicle controller, and the charging device includes a diagnostic circuit connected to the vehicle controller.

[0017] In some embodiments, the diagnostic circuit can diagnose whether the charging device is faulty and report it to the vehicle controller, so that the vehicle controller can troubleshoot the fault.

[0018] Optionally, the power supply device includes an isolation transformer connected between the input terminal and the voltage conversion circuit.

[0019] In some embodiments, the isolation transformer can provide electrical isolation between the input terminal and the voltage conversion circuit, improving the safety of the power supply device.

[0020] Optionally, the power supply device includes a protection circuit connected between the voltage conversion circuit and the output terminal.

[0021] In some embodiments, the protection circuit can provide overcurrent, overvoltage and other protections for the power supply device, thereby improving the safety of the power supply device.

[0022] This application also provides a vehicle, including:

[0023] A battery pack, comprising multiple batteries connected in series; and

[0024] The power replenishment device as described in any of the above claims is connected to the battery pack.

[0025] Optionally, the vehicle also includes a power battery connected to the battery pack for supplying power to the battery pack.

[0026] Optionally, the vehicle further includes a high-voltage conversion circuit connected between the power battery and the battery pack.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] Figure 1 The diagram shown is a structural block diagram of one embodiment of the vehicle described in this application.

[0030] Figure 2 The diagram shown is a structural block diagram of another embodiment of the vehicle of this application. Detailed Implementation

[0031] This application provides a vehicle battery charging device and a vehicle including the same. The vehicle battery charging device and the vehicle including the same are described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0032] Figure 1 The diagram shown is a structural block diagram of one embodiment of the vehicle 10 of this application. Figure 1 As shown, vehicle 10 includes a battery pack 11 and a charging device 20.

[0033] The battery pack 11 includes multiple batteries 12 connected in series. The vehicle also includes loads such as a fan system, ignition system, lighting system, audio system, onboard electronic equipment, power windows, etc. The batteries 12 can supply power to these loads. Figure 1 In the described embodiment, the battery pack 11 includes two batteries 12 connected in series, one of which supplies power to the load. The battery 12 supplying power to the load can be any one of the batteries 12 in the battery pack 11. In other embodiments, the battery pack 11 includes three or more batteries 12 connected in series, one of which supplies power to the load.

[0034] The power replenishment device 20 is connected to the battery pack 11. The power replenishment device 20 can replenish the power of any one of the batteries 12 in the battery pack 11. When a battery 12 in the battery pack 11 is depleted, the power replenishment device 20 supplies power to that battery 12, bringing it back to its normal voltage level. The power replenishment device 20 can supply power to different batteries 12, but it only supplies power to one battery 12 at a time.

[0035] Optionally, the vehicle 10 also includes a power battery connected to the battery pack 11 for supplying power to the battery pack 11.

[0036] The power battery can supply power to the entire battery pack 11, thereby powering each battery 12. The power battery can be charged by an external power source.

[0037] Optionally, the vehicle 10 also includes a high-voltage conversion circuit connected between the power battery and the battery pack 11.

[0038] The high-voltage conversion circuit can convert the high-voltage electricity output by the power battery into the low-voltage electricity required by the battery pack 11, so that the power battery can supply power to the battery pack 11.

[0039] The vehicle battery charging device 20 includes: an input terminal T1, an output terminal T2, and a voltage conversion circuit 21.

[0040] Input terminal T1 is connected to battery pack 11 to receive the output voltage of battery pack 11. Input terminal T1 can be connected to battery pack 11 via cables and wiring harnesses. Figure 1 In the embodiment shown, the voltage of the storage battery 12 is 12V, the output voltage of the storage battery pack 11 composed of two series-connected storage batteries 12 is 24V, and the voltage received by the input terminal T1 is 24V.

[0041] Output terminal T2 is connected to multiple batteries 12 respectively, and is used to output voltage to one of the batteries 12. Figure 1In the illustrated embodiment, the power supply device 20 includes two output terminals T2, each connected to one of two batteries 12. The power supply device 20 outputs voltage to the batteries 12 through the output terminals T2, thus supplying power to the batteries 12. In some embodiments, the output voltage of the output terminal T2 is determined based on the voltage of the battery 12 connected to the output terminal T2. In some embodiments, the output voltage of the output terminal T2 is determined based on the power of the load supplied by the battery 12 connected to the output terminal T2.

[0042] The voltage conversion circuit 21 is connected to the input terminal T1 and the output terminal T2. The voltage conversion circuit 21 is used to convert the output voltage of the battery pack 11 into the input voltage of one of the batteries 12, so that one of the batteries 12 in the battery pack 11 can be powered by the other batteries 12.

[0043] exist Figure 1 In the illustrated embodiment, the output voltage of the battery pack 11 is 24V. The voltage conversion circuit 21 converts the 24V output voltage of the battery pack 11 into a 12V input voltage for a battery 12. The voltage conversion circuit 21 provides a 12V voltage to the battery 12 through an output terminal T2, thus powering the battery 12.

[0044] In some embodiments, the battery pack 11 includes a plurality of batteries 12. The voltage conversion circuit 21 can convert the output voltage of the battery pack 11 into the input voltage of one of the batteries 12, so that the batteries with high charge in the battery pack 11 can charge the batteries with low charge, preventing the batteries 12 from being depleted and causing vehicle malfunctions.

[0045] Optionally, the battery pack 11 includes a first battery and a second battery connected in series, and the output terminal T2 is connected to the first battery and the second battery respectively. The voltage conversion circuit 21 is used to convert the output voltage of the battery pack 11 into the input voltage of the first battery and / or the second battery, so that the first battery supplies power to the second battery, or the second battery supplies power to the first battery.

[0046] Input terminal T1 receives the output voltages of the first and second batteries, and output terminal T2 is connected to both the first and second batteries, allowing it to output voltage to either battery. Voltage conversion circuit 21 converts the voltage received at input terminal T1 into the output voltage at output terminal T2. When the first battery needs charging, voltage conversion circuit 21 converts the output voltage of the second battery into the input voltage of the first battery, enabling the second battery to charge the first battery; conversely, when the second battery needs charging, voltage conversion circuit 21 converts the output voltage of the first battery into the input voltage of the second battery, enabling the first battery to charge the second battery.

[0047] In some embodiments, the first battery and the second battery are connected in series and are respectively connected to the voltage conversion circuit 21. The voltage conversion circuit 21 converts the output voltage of the battery pack 11 into the input voltage of the first battery and / or the second battery, so that the battery with higher charge can charge the battery with lower charge, preventing the battery from being depleted and causing vehicle malfunction.

[0048] Figure 2 The diagram shown is a structural block diagram of another embodiment of the vehicle 10 of this application.

[0049] Optionally, the power supply device 20 includes a control circuit 22 connected to a voltage conversion circuit 21, for controlling the voltage conversion circuit 21 to convert the output voltage of the battery pack 11 into the input voltage of one of the batteries 12.

[0050] Control circuit 22 is used to control voltage conversion circuit 21 to convert voltage. Control circuit 22 is used to control which battery 12 is converted voltage by voltage conversion circuit 21. Control circuit 22 includes a controller.

[0051] In some embodiments, the control circuit 22 can control the voltage conversion circuit 21 to convert the voltage, thereby enabling the battery pack 11 to charge one of the batteries 12, preventing the battery 12 from running out of power and causing vehicle malfunction.

[0052] Optionally, the power replenishment device 20 includes a voltage sensor 23, which is connected between the control circuit 22 and the multiple batteries 12, respectively, for detecting the output voltage of the multiple batteries 12.

[0053] Voltage sensor 23 can detect the output voltage of battery 12 and transmit the signal to control circuit 22, so that control circuit 22 knows the output voltage of battery 12. Based on the output voltage of battery 12, control circuit 22 determines whether battery 12 needs to be recharged.

[0054] In some embodiments, the voltage sensor 23 can detect the output voltage of the battery 12, enabling the control circuit 22 to acquire the output voltage of the battery 12 and charge it according to the specific situation of the output voltage of the battery 12, making charging more intelligent.

[0055] Optionally, the vehicle 10 includes a vehicle controller 13, and the charging device 20 includes a diagnostic circuit 24 connected to the vehicle controller 13.

[0056] The vehicle controller 13 is used for overall control and management of the vehicle 10. The diagnostic circuit 24 is used to diagnose whether the charging device 20 is faulty. The diagnostic circuit 24 is connected to the vehicle controller 13 and can send fault information of the charging device 20 to the vehicle controller 13, so that the vehicle controller 13 can obtain the fault information of the charging device 20 and control and manage the vehicle according to the fault information.

[0057] In some embodiments, the diagnostic circuit 24 can diagnose whether the power supply device 20 is faulty and report it to the vehicle controller 13, so that the vehicle controller 13 can troubleshoot the fault.

[0058] Optionally, the power supply device 20 includes an isolation transformer 25 connected between the input terminal T1 and the voltage conversion circuit 21. The isolation transformer 25 provides electrical isolation between its input and output voltages. The input and output windings of the isolation transformer 25 are not directly connected; electrical isolation is achieved only through magnetic field coupling. By changing the transformation ratio and capacity of the isolation transformer 25, it can be adapted to the requirements of different vehicle power supply devices. The isolation transformer 25 can also mitigate electromagnetic interference generated by other electronic devices in the vehicle 10 on the power supply device 20.

[0059] In some embodiments, the isolation transformer 25 can provide electrical isolation between the input terminal T1 and the voltage conversion circuit 21, thereby improving the safety of the power supply device 20.

[0060] Optionally, the power supply device 20 includes a protection circuit 26 connected between the voltage conversion circuit 21 and the output terminal T2.

[0061] The protection circuit includes overcurrent protection, overvoltage protection, undervoltage protection, and overheat protection. The overcurrent protection circuit detects the current in the circuit; when the current exceeds a set threshold, it disconnects, preventing the battery 12 and the charging device 20 from overheating or being damaged due to overcurrent. The overvoltage protection circuit detects the voltage in the circuit; when the voltage is higher than the normal voltage range, it limits the voltage to a safe range or disconnects the circuit. When the voltage in the circuit is lower than the normal voltage or the minimum voltage required for normal operation, the undervoltage protection circuit disconnects the circuit or sends an alarm signal to the control equipment. The overcurrent protection circuit uses a temperature sensor to detect the circuit temperature; when the temperature exceeds a set threshold, the overheat protection circuit controls the circuit temperature to decrease or disconnects the circuit. The overheat protection circuit can send a signal to the vehicle controller, which then controls the cooling fan to dissipate heat and reduce the temperature of the charging device 20.

[0062] In some embodiments, the protection circuit 26 can provide overcurrent, overvoltage and other protections for the power supply device 20, thereby improving the safety of the power supply device 20.

[0063] Optionally, vehicle 10 includes a starting system, and charging device 20 includes an enable terminal connected to the starting system. The starting system is used to receive a starting signal from vehicle 10, for example, when the key is inserted into vehicle 10, the vehicle starts. The connection between the starting system and the enable terminal allows the charging device 20 to receive the starting signal from vehicle 10 and control the charging of battery 12 based on whether vehicle 10 is started.

[0064] In some embodiments, the control circuit 22 first detects whether the vehicle 10 has started based on the signal from the enable terminal. After the vehicle starts, it detects whether the output voltage of the battery pack 11 is within the normal range. If it is not within the normal range, it performs overvoltage or undervoltage protection and reports it to the vehicle controller via the CAN network. If the output voltage of the battery pack 11 is within the normal range, it performs UDS (Unified Diagnostic Services) testing on the battery 12. If a fault is found, it reports the fault to the vehicle controller. If there is no fault, it performs constant voltage charging on the battery 12. When the battery 12 reaches a charge threshold, it performs float charging on the battery 12. In some embodiments, the charge threshold is 80%.

[0065] After the control circuit 22 detects that the vehicle is powered off, it checks whether the output voltage of the battery pack 11 is within the normal range. If it is not within the normal range, overvoltage or undervoltage protection is implemented, and the data is reported to the vehicle controller via the CAN network. If the output voltage of the battery pack 11 is within the normal range, after the battery 12 has discharged for a first duration, the voltage of the battery 12 is collected every second duration. In some embodiments, the first duration is 300 seconds, and the second duration is 500 ms. When the voltage of the battery 12 is lower than the lower threshold, the battery 12 needs to be recharged. The voltage of other batteries 12 is converted into the input voltage of the battery 12 through the output terminal T2 to charge the battery 12. When the charge of the battery 12 returns to the normal range, the voltage of the battery 12 is detected. When the voltage of the battery 12 reaches 1 / N of the charge of the battery pack 11, the battery 12 is controlled to enter a sleep mode. The battery pack 11 includes N batteries 12 connected in series.

[0066] In the battery pack 11, one battery 12 will have a lower charge than the other batteries 12 due to external discharge. The other batteries 12 will supply power to this battery 12. When the charge of battery 12 reaches 1 / N of the charge of the battery pack 11, the charge of all batteries 12 in the battery pack 11 will be the same. At this time, the power supply will stop and the battery will enter a hibernation mode.

[0067] After the battery 12 enters hibernation, the voltage of the battery 12 is collected every three hours. When the voltage of the battery 12 is lower than the lower limit of the threshold, it is recharged. When the battery 12 reaches the normal range, the battery 12 is controlled to enter hibernation. This cycle is repeated so that the battery 12 will not be depleted during hibernation.

Claims

1. A charging device for a vehicle battery, characterized in that, The vehicle includes a battery pack, the battery pack comprising multiple batteries connected in series, and the charging device includes: The input terminal is connected to the battery pack and is used to receive the output voltage of the battery pack. The output terminal is connected to the plurality of said batteries respectively, and is used to output voltage to one of said batteries; A voltage conversion circuit, connected to the input terminal and the output terminal, is used to convert the output voltage of the battery pack into the input voltage of one of the batteries, so that one of the batteries in the battery pack is powered by the other batteries.

2. The vehicle battery charging device according to claim 1, characterized in that, The battery pack includes a first battery and a second battery connected in series. The output terminal is connected to the first battery and the second battery respectively. The voltage conversion circuit is used to convert the output voltage of the battery pack into the input voltage of the first battery and / or the second battery, so that the first battery supplies power to the second battery, or the second battery supplies power to the first battery.

3. The vehicle battery charging device according to claim 1, characterized in that, The power replenishment device includes a control circuit connected to the voltage conversion circuit, used to control the voltage conversion circuit to convert the output voltage of the battery pack into the input voltage of one of the batteries.

4. The vehicle battery charging device according to claim 3, characterized in that, The power replenishment device includes voltage sensors connected between the control circuit and the multiple batteries, respectively, for detecting the output voltage of the multiple batteries.

5. The vehicle battery charging device according to claim 1, characterized in that, The vehicle includes a vehicle controller, and the charging device includes a diagnostic circuit connected to the vehicle controller.

6. The vehicle battery charging device according to claim 1, characterized in that, The power supply device includes an isolation transformer connected between the input terminal and the voltage conversion circuit.

7. The vehicle battery charging device according to claim 1, characterized in that, The power replenishment device includes a protection circuit connected between the voltage conversion circuit and the output terminal.

8. A vehicle, characterized in that, include: A battery pack, comprising multiple batteries connected in series; and The power replenishment device as described in any one of claims 1-7, wherein the power replenishment device is connected to the battery pack.

9. The vehicle according to claim 8, characterized in that, The vehicle also includes a power battery connected to the battery pack for supplying power to the battery pack.

10. The vehicle according to claim 9, characterized in that, The vehicle also includes a high-voltage conversion circuit connected between the power battery and the battery pack.

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