Charging control method and related device

Abstract

The invention discloses a charging control method and a related device, and relates to the technical field of vehicles. In the application, the charging control device can obtain the load demand of the first load, the residual electric quantity information of the first low-voltage battery and the residual electric quantity information of the second low-voltage battery, and determine the charging strategy based on the load demand of the first load, the residual electric quantity information of the first low-voltage battery and the residual electric quantity information of the second low-voltage battery. The charging strategy is used for controlling the state of the electric energy conversion device, so that the high-voltage battery charges the first low-voltage battery and / or the second low-voltage battery through the electric energy conversion device. The charging strategy considers the influence of the load demand of the first load, and the charging efficiency of the first low-voltage battery and the second low-voltage battery can be improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a power supply control method and related devices. Background Technology

[0002] With the development of vehicle electrification, more and more low-voltage electrical devices are appearing on vehicles. To ensure power redundancy for these devices, vehicles are generally equipped with two low-voltage batteries, so that if one low-voltage battery fails, the other can still power the devices. When the remaining charge of the low-voltage battery is low, it is usually replenished by the vehicle's high-voltage battery (such as the power battery). However, the current low-voltage battery replenishment efficiency is relatively low. Summary of the Invention

[0003] This application provides a battery charging control method and related apparatus, which can improve battery charging efficiency.

[0004] In a first aspect, embodiments of this application provide a power replenishment control method, which includes: a power replenishment control device acquiring the load demand of a first load, the remaining power information of a first low-voltage battery, and the remaining power information of a second low-voltage battery; the first low-voltage battery and / or the second low-voltage battery being used to supply power to the first load; determining a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery; the power replenishment strategy being used to control the state of a power conversion device connected between a high-voltage battery and the first low-voltage battery and the second low-voltage battery, so that the high-voltage battery replenishes power to the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0005] The high-voltage battery outputs a voltage higher than the charging voltage of the low-voltage battery, and therefore, the high-voltage battery's output voltage cannot directly recharge the low-voltage battery. An energy conversion device can convert energy from the high-voltage battery to the low-voltage battery, thus enabling the high-voltage battery to recharge the low-voltage battery. For example, the high-voltage battery can recharge at least one of a first low-voltage battery and a second low-voltage battery through the energy conversion device. The energy conversion device can be in different states, and in different states, it can perform energy conversion from the high-voltage battery to different low-voltage batteries.

[0006] The power replenishment strategy may include: the object to be replenished and the output power of the power conversion device. The power conversion device may have different objects to be replenished and different output power depending on its state. The object to be replenished may include at least one of a first low-voltage battery and a second low-voltage battery.

[0007] In this embodiment, a power replenishment strategy can be determined based on the load demand of the first load, the remaining power of the first low-voltage battery, and the remaining power of the second low-voltage battery. The power replenishment strategy takes into account the impact of the load demand of the first load, thereby improving the power replenishment efficiency of the first and second low-voltage batteries.

[0008] Optionally, the power conversion device may include at least two power conversion circuits and a switching unit. By controlling the states of the at least two power conversion circuits and the switching unit, the high-voltage battery can supply power to the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0009] In one possible example, the power conversion device includes a first power conversion circuit, a second power conversion circuit, and a switching unit. The first power conversion circuit converts a first direct current (DC) output from a high-voltage battery into a second DC, so that the second DC supplies power to a first low-voltage battery and / or a second low-voltage battery, wherein the voltage of the first DC is greater than or equal to the voltage of the second DC. The second power conversion circuit converts the first DC output from the high-voltage battery into a third DC, so that the third DC supplies power to the first low-voltage battery and / or a second low-voltage battery, wherein the voltage of the first DC is greater than or equal to the voltage of the third DC. The switching unit controls the connection or disconnection of the first power conversion circuit with the second low-voltage battery, and / or controls the connection or disconnection of the second power conversion circuit with the first low-voltage battery.

[0010] In another possible example, the power conversion device further includes a third power conversion circuit for converting the first DC power output from the high-voltage battery into a fourth DC power, so that the fourth DC power supplies power to the first low-voltage battery and / or the second low-voltage battery, wherein the voltage of the first DC power is greater than or equal to the voltage of the fourth DC power. A switching unit is used to control the connection or disconnection of the third power conversion circuit with the first low-voltage battery, and / or to control the connection or disconnection of the third power conversion circuit with the second low-voltage battery.

[0011] The first, second, and third power conversion circuits can be DC-DC converters in the vehicle. The switching unit can be a metal-oxide-semiconductor field-effect transistor (MOSFET). The high-voltage battery can be the vehicle's power battery. The first and second low-voltage batteries can be batteries in the vehicle that supply power to the first load. The low-voltage battery can be a storage battery in the vehicle. The charging control device can be the vehicle's battery management system (BMS).

[0012] In this embodiment, the high-voltage battery can replenish either the first low-voltage battery or the second low-voltage battery through a first power conversion circuit, and the first low-voltage battery or the second low-voltage battery can be replenished through a second power conversion circuit. Both the first low-voltage battery and the second low-voltage battery support two replenishment channels, thereby improving the replenishment efficiency of the first low-voltage battery and the second low-voltage battery.

[0013] Optionally, the power replenishment control device can determine which low-voltage battery needs to be replenished based on the remaining power of the first low-voltage battery and the remaining power of the second low-voltage battery, and determine whether to use one or two power conversion circuits for power replenishment based on the load power of the first load; this can balance improving power replenishment efficiency and extending the lifespan of the power conversion circuits.

[0014] In one possible implementation of the first aspect, the power supply control device determines a power supply strategy, which may be implemented in ways including but not limited to: when the load power indicated by the load demand of the first load is less than or equal to a first threshold, the first power conversion circuit is controlled to be in an output state and the second power conversion circuit is controlled to be in an off state; wherein, the switching unit is controlled to be in an on state or an off state.

[0015] If the load demand indicated by the first load is less than or equal to the first threshold, it indicates that the load demand indicated by the first load is low and it is in a low-load condition. At this time, activating one power conversion circuit is sufficient to meet the load demand of the first load and the charging demand of the low-voltage battery, so that the other power conversion circuit does not work, thereby extending the life of the other power conversion circuit.

[0016] In one possible implementation of the first aspect, the power supply control device determines a power supply strategy, which may be implemented in ways including but not limited to: when the load power indicated by the load demand of the first load is greater than or equal to a first threshold, the first power conversion circuit is controlled to be in an output state and the second power conversion circuit is controlled to be in an output state; wherein, the switching unit is controlled to be in an on state or an off state.

[0017] In this embodiment, if the load power indicated by the load demand of the first load is greater than or equal to a first threshold, it indicates that the load power indicated by the load demand of the first load is high, and the load is under high load. At this time, it is difficult to meet the load demand of the first load and the charging demand of the low-voltage battery by using only one power conversion circuit. Therefore, two power conversion circuits are allowed to work simultaneously to improve the charging efficiency of the low-voltage battery.

[0018] In one possible implementation of the first aspect, if the load power indicated by the load demand of the first load is less than or equal to a first threshold, the power supply control device determines a power supply strategy, which may be implemented in ways including but not limited to the following: When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold, the voltage of the second DC power output by the first power conversion circuit is controlled to be the charging voltage of the first low-voltage battery.

[0019] Optionally, if the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the charging control device controls the switching unit to be in the conducting state; and controls the voltage of the second DC power output by the first power conversion circuit to be the charging voltage of the second low-voltage battery.

[0020] In this embodiment, the second threshold, third threshold, and first threshold can be preset threshold values. The second threshold and third threshold can be equal or unequal. If the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, it indicates that the first low-voltage battery needs to be recharged. If the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold, it indicates that the second low-voltage battery does not need to be recharged. If the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to the second threshold, it indicates that the first low-voltage battery does not need to be recharged. If the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, it indicates that the second low-voltage battery needs to be recharged. If the load power indicated by the load demand of the first load is less than or equal to the first threshold, it indicates that the load demand of the first load is low.

[0021] It should be noted that when the remaining power indicated by the remaining power information of the first low-voltage battery is equal to the second threshold, it can be considered that the first low-voltage battery needs to be recharged or does not need to be recharged. When the remaining power indicated by the remaining power information of the second low-voltage battery is equal to the third threshold, it can be considered that the second low-voltage battery needs to be recharged or does not need to be recharged. The specific settings can be made according to actual needs.

[0022] In this embodiment, when the load demand of the first load is low, the first low-voltage battery needs recharging, and the second low-voltage battery does not require recharging, the high-voltage battery can recharge the first low-voltage battery through the first power conversion circuit. In this case, the second power conversion circuit is not operating, thus maintaining the recharging efficiency of the first low-voltage battery while extending the lifespan of the second power conversion circuit. Similarly, when the load demand of the first load is low, the first low-voltage battery does not require recharging, but the second low-voltage battery does require recharging, the high-voltage battery can recharge the second low-voltage battery through the first power conversion circuit. In this case, the second power conversion circuit is not operating, thus maintaining the recharging efficiency of the second low-voltage battery while extending the lifespan of the second power conversion circuit.

[0023] In one possible implementation of the first aspect, if the load power indicated by the load demand of the first load is less than or equal to a first threshold, the power supply control device determines a power supply strategy, further comprising: When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the control switch unit is in the on state. The second DC power output from the first power conversion circuit is used to replenish the first low-voltage battery and the second low-voltage battery. The voltage of the second DC power is the larger of the charging voltage of the first low-voltage battery and the charging voltage of the second low-voltage battery.

[0024] In this embodiment, if the remaining power information of the first low-voltage battery indicates that the remaining power is less than or equal to a second threshold, it indicates that the first low-voltage battery needs to be recharged. If the remaining power information of the second low-voltage battery indicates that the remaining power is less than or equal to a third threshold, it indicates that the second low-voltage battery needs to be recharged. If the load demand information of the first load indicates that the load power is less than or equal to a first threshold, it indicates that the load demand of the first load is low.

[0025] In this embodiment, when the load demand of the first load is low and both the first and second low-voltage batteries need recharging, the high-voltage battery can simultaneously recharge both the first and second low-voltage batteries via the first power conversion circuit. At this time, the second power conversion circuit is not operational, thus balancing the recharging efficiency of both batteries and extending the lifespan of the second power conversion circuit.

[0026] In one possible implementation of the first aspect, if the load power indicated by the load demand of the first load is greater than or equal to a first threshold, the power supply control device determines a power supply strategy, further comprising: When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold, the power replenishment control device controls the switch unit to be in the conducting state. The second DC power output from the first power conversion circuit is used to replenish the first low-voltage battery, and the third DC power output from the second power conversion circuit is used to replenish the first low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the first low-voltage battery.

[0027] Optionally, when the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the charging control device controls the switching unit to be in the conducting state; wherein, the second DC power output from the first power conversion circuit is used to charge the second low-voltage battery, the third DC power output from the second power conversion circuit is used to charge the second low-voltage battery, the voltage of the second DC power is the charging voltage of the second low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery.

[0028] In this embodiment, if the remaining power information of the first low-voltage battery indicates that the remaining power is less than or equal to a second threshold, it indicates that the first low-voltage battery needs recharging. If the remaining power information of the second low-voltage battery indicates that the remaining power is greater than or equal to a third threshold, it indicates that the second low-voltage battery does not need recharging. If the remaining power information of the first low-voltage battery indicates that the remaining power is greater than or equal to the second threshold, it indicates that the first low-voltage battery does not need recharging. If the remaining power information of the second low-voltage battery indicates that the remaining power is less than or equal to the third threshold, it indicates that the second low-voltage battery needs recharging. If the load demand of the first load indicates that the load power is greater than or equal to a first threshold, it indicates that the load demand of the first load is high.

[0029] In this embodiment, when the load demand of the first load is high, the first low-voltage battery needs recharging, but the second low-voltage battery does not, the high-voltage battery can simultaneously recharge the first low-voltage battery through the first power conversion circuit and the second power conversion circuit, thereby improving the recharging efficiency of the first low-voltage battery. Similarly, when the load demand of the first load is high, the first low-voltage battery does not need recharging, but the second low-voltage battery does, the high-voltage battery can simultaneously recharge the second low-voltage battery through the first power conversion circuit and the second power conversion circuit, thereby improving the recharging efficiency of the second low-voltage battery.

[0030] In one possible implementation of the first aspect, if the load power indicated by the load demand of the first load is greater than or equal to a first threshold, the power supply control device determines a power supply strategy, further comprising: When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the power replenishment control device controls the switch unit to be in the off state. The second DC power output from the first power conversion circuit is used to charge the first low-voltage battery, and the third DC power output from the second power conversion circuit is used to charge the second low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery.

[0031] In this embodiment, if the remaining power information of the first low-voltage battery indicates that the remaining power is less than or equal to a second threshold, it indicates that the first low-voltage battery needs to be recharged. If the remaining power information of the second low-voltage battery indicates that the remaining power is less than or equal to a third threshold, it indicates that the second low-voltage battery needs to be recharged. If the load demand information of the first load indicates that the load power is greater than or equal to a first threshold, it indicates that the load demand of the first load is high.

[0032] In this embodiment, when the load demand of the first load is high and both the first and second low-voltage batteries need recharging, the high-voltage battery can recharge the first low-voltage battery through the first power conversion circuit, and the high-voltage battery can recharge the second low-voltage battery through the second power conversion circuit. This can improve the recharging efficiency of the first and second low-voltage batteries.

[0033] In one possible implementation of the first aspect, the above-mentioned power replenishment control method further includes: when the first power conversion circuit fails and the second power conversion circuit does not fail, the power replenishment control device controls the operating state of the second power conversion circuit and the on / off state of the switching unit based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, so that the second power conversion circuit replenishes the first low-voltage battery and / or the second low-voltage battery.

[0034] In this embodiment of the application, when one of the first power conversion circuit and the second power conversion circuit fails, the high-voltage battery can replenish the first low-voltage battery and / or the second low-voltage battery through the other power conversion circuit, which can improve the replenishment efficiency under the fault of the power conversion circuit.

[0035] In one possible implementation of the first aspect, if the first power conversion circuit fails and the second power conversion circuit does not fail, the operating state of the second power conversion circuit and the on / off state of the switching unit are controlled based on the remaining charge information of the first low-voltage battery and the remaining charge information of the second low-voltage battery, including: When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to a third threshold, the second power conversion circuit is controlled to be in output state and the switching unit is controlled to be in conduction state; wherein, the second power conversion circuit is used to convert the first DC power output from the high-voltage battery into a third DC power, the third DC power is used to replenish the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the first low-voltage battery; or, When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to a third threshold, the second power conversion circuit is controlled to be in output state and the switching unit is in conduction state; wherein, the second power conversion circuit is used to convert the first DC power output from the high-voltage battery into a third DC power, the third DC power is used to replenish the first and second low-voltage batteries, and the voltage of the third DC power is the larger value between the charging voltage of the first and second low-voltage batteries; or, When the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the second power conversion circuit is controlled to be in the output state, and the switching unit is controlled to be in the on or off state; wherein, the second power conversion circuit is used to convert the first DC power output from the high-voltage battery into a third DC power, the third DC power is used to replenish the second low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery.

[0036] In this embodiment, when the first power conversion circuit fails and the first low-voltage battery needs recharging while the second low-voltage battery does not, the high-voltage battery can recharge the first low-voltage battery through the second power conversion circuit. This provides a new recharging path for the first low-voltage battery when the first power conversion circuit fails, thereby improving the recharging efficiency of the first low-voltage battery. When both the first and second low-voltage batteries need recharging, the high-voltage battery can simultaneously recharge both batteries through the second power conversion circuit. This provides a new recharging path for the first low-voltage battery when the first power conversion circuit fails, further improving the recharging efficiency of both batteries. Finally, when the second low-voltage battery needs recharging, the high-voltage battery can recharge it through the second power conversion circuit, improving the recharging efficiency of the second low-voltage battery when the first power conversion circuit fails.

[0037] In one possible implementation of the first aspect, the power conversion device is applied to a vehicle; the charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's power consumption voltage, and the required charging voltage of the first low-voltage battery.

[0038] The upper limit of the charging voltage for the first low-voltage battery can be obtained based on its battery temperature and voltage. The lower limit of the vehicle's electrical voltage can be the lowest electrical voltage required by the entire vehicle. The lower limit of the vehicle's electrical voltage can be a fixed value. The required charging voltage for the first low-voltage battery can be a charging voltage that maximizes its lifespan. The charging control device can calculate this based on the load power supply and quiescent current of the first low-voltage battery.

[0039] In this embodiment, when the required charging voltage of the first low-voltage battery can be obtained, the charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery. By considering the required charging voltage of the first low-voltage battery when obtaining its charging voltage, the accuracy of the charging voltage can be improved.

[0040] In one possible implementation of the first aspect, the power conversion device is applied to a vehicle; the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's power consumption voltage.

[0041] In this embodiment, when the required charging voltage of the first low-voltage battery cannot be obtained, the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's power consumption voltage. This can improve the charging speed of the first low-voltage battery, thereby improving the charging efficiency of the first low-voltage battery.

[0042] In this embodiment, the charging voltage of the first low-voltage battery is a voltage determined by the charging control device that is suitable for charging the first low-voltage battery. There are two scenarios: Scenario 1: When the required charging voltage of the first low-voltage battery can be obtained, the charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery. Scenario 2: When the required charging voltage of the first low-voltage battery cannot be obtained, the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0043] In one possible implementation of the first aspect, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, and the required charging voltage of the first low-voltage battery is the minimum of the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is less than or equal to a first threshold, and the lower limit of the vehicle's electrical voltage is the minimum value among the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the required charging voltage of the first low-voltage battery; or, When the load power indicated by the load demand of the first load is less than or equal to a first threshold, and the required charging voltage of the first low-voltage battery is greater than or equal to the upper limit of the charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is greater than or equal to the third threshold, the charging voltage of the first low-voltage battery is the maximum value among the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery.

[0044] In this embodiment, if the charging voltage of the first low-voltage battery is too high, it will affect the lifespan of the first low-voltage battery; if the charging voltage of the first low-voltage battery is too low, it will affect the charging efficiency of the first low-voltage battery. The charging control device can determine the charging voltage of the first low-voltage battery based on the size of the first load, the upper limit of the charging voltage of the first low-voltage battery, the required charging voltage of the first low-voltage battery, and the minimum power consumption voltage of the vehicle, thereby obtaining an accurate charging voltage for the first low-voltage battery, which can balance the charging efficiency and lifespan of the first low-voltage battery.

[0045] In one possible implementation of the first aspect, the power conversion device is applied to a vehicle; the charging voltage of the second low-voltage battery is determined based on the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's power consumption voltage, and the required charging voltage of the second low-voltage battery.

[0046] The upper limit of the charging voltage for the second low-voltage battery can be obtained based on its battery temperature and voltage. The lower limit of the vehicle's electrical voltage can be the lowest electrical voltage required by the entire vehicle. The lower limit of the vehicle's electrical voltage can be a fixed value. The required charging voltage for the second low-voltage battery can be a charging voltage that maximizes its lifespan. The charging control device can calculate this based on the second low-voltage battery's load power supply, quiescent current, etc.

[0047] In this embodiment, when the required charging voltage of the second low-voltage battery can be obtained, the charging voltage of the second low-voltage battery is determined based on the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery. By considering the required charging voltage of the second low-voltage battery when obtaining its charging voltage, the accuracy of the charging voltage of the second low-voltage battery can be improved.

[0048] In one possible implementation of the first aspect, the power conversion device is applied to a vehicle; the charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's power consumption voltage.

[0049] In this embodiment, when the required charging voltage of the second low-voltage battery cannot be obtained, the charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's power consumption voltage. This can improve the charging speed of the second low-voltage battery, thereby improving the charging efficiency of the second low-voltage battery.

[0050] In this embodiment, the charging voltage of the second low-voltage battery is a voltage suitable for charging the second low-voltage battery, determined by the charging control device. There are two scenarios: Scenario 1: When the required charging voltage of the second low-voltage battery can be obtained, the charging voltage of the second low-voltage battery is determined based on the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery. Scenario 2: When the required charging voltage of the second low-voltage battery cannot be obtained, the charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0051] In one possible implementation of the first aspect, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, and the required charging voltage of the second low-voltage battery is the minimum of the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is less than or equal to the first threshold, and the lower limit of the vehicle's electrical voltage is the minimum value among the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery shall be the required charging voltage of the second low-voltage battery; or, When the load power indicated by the load demand of the first load is less than or equal to the first threshold, and the required charging voltage of the second low-voltage battery is greater than or equal to the upper limit of the charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is greater than or equal to the third threshold, the charging voltage of the second low-voltage battery is the maximum value among the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery.

[0052] In this embodiment, if the charging voltage of the second low-voltage battery is too high, it will affect the battery's lifespan; if the charging voltage is too low, it will affect the battery's charging efficiency. The charging control device can determine the charging voltage of the second low-voltage battery based on the size of the first load, the upper limit of the second low-voltage battery's charging voltage, the battery's required charging voltage, and the vehicle's minimum operating voltage, thereby obtaining an accurate charging voltage that balances both the battery's charging efficiency and lifespan.

[0053] In one possible implementation of the first aspect, when the power conversion device is in a first operating mode, the first low-voltage battery is used to power the first load; or, the second low-voltage battery is used to power the first load. When the power conversion device is in the second operating mode, the first low-voltage battery is used to power the second load, and the second low-voltage battery is used to power the third load; the first load includes the second load and the third load, and the energy consumption of the first operating mode is less than or equal to the energy consumption of the second operating mode.

[0054] In this embodiment, the first operating mode can be a non-driving vehicle mode. The second operating mode can be a driving vehicle mode. Considering the difference in load power supply strategies when the vehicle is in the first or second operating mode: In the first operating mode (e.g., the vehicle is in sleep mode), the power consumption of the first load is very low. Only one power conversion circuit needs to be activated to charge one low-voltage battery, allowing the other power conversion circuit and the other low-voltage battery to sleep or stop working, thus extending the lifespan of the other power conversion circuit and the other low-voltage battery. In the second operating mode, the first low-voltage battery powers the second load, and the second low-voltage battery powers the third load. The two low-voltage batteries power different low-voltage loads respectively, thereby keeping the lifespan of the first and second low-voltage batteries as consistent as possible.

[0055] In one possible example, the first low-voltage battery is the primary low-voltage battery, and the second low-voltage battery is the secondary low-voltage battery.

[0056] In another possible example, the second low-voltage battery is the auxiliary low-voltage battery, and the first low-voltage battery is the main low-voltage battery.

[0057] Secondly, embodiments of this application provide a power replenishment control system, which includes: a high-voltage battery, a first low-voltage battery, a second low-voltage battery, a power conversion device, and a power replenishment control device; the high-voltage battery is connected to the first low-voltage battery and the second low-voltage battery respectively through the power conversion device; A power supply control device is used to acquire the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery; the first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load. The power replenishment control device is also used to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The power replenishment strategy is used to control the state of the power conversion device so that the high-voltage battery replenishes the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0058] In one possible implementation of the second aspect, the power conversion device includes: a first power conversion circuit, a second power conversion circuit, and a switching unit.

[0059] The first power conversion circuit is used to convert the first DC power output from the high-voltage battery into a second DC power, so that the second DC power can replenish the first low-voltage battery and / or the second low-voltage battery. The voltage of the first DC power is greater than or equal to the voltage of the second DC power. The second power conversion circuit is used to convert the first DC power output from the high-voltage battery into a third DC power, so that the third DC power can replenish the first low-voltage battery and / or the second low-voltage battery. The voltage of the first DC power is greater than or equal to the voltage of the third DC power. The switching unit is used to control the connection or disconnection of the first power conversion circuit with the second low-voltage battery, and / or to control the connection or disconnection of the second power conversion circuit with the first low-voltage battery.

[0060] In one possible implementation of the second aspect, the high-voltage battery is connected to the input terminal of the first power conversion circuit and the input terminal of the second power conversion circuit, respectively; the output terminal of the first power conversion circuit is connected to the first low-voltage battery and to the second low-voltage battery via a switching unit; the output terminal of the second power conversion circuit is connected to the second low-voltage battery and to the first low-voltage battery via a switching unit.

[0061] In one possible implementation of the second aspect, the power replenishment control device is further configured to control the operating state of the first power conversion circuit, the operating state of the second power conversion circuit, and the on / off state of the switching unit based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in an output state and the second power conversion circuit to be in an off state, based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, when the load power indicated by the load demand of the first load is less than or equal to a first threshold; wherein, the switching unit is controlled to be in an on state or an off state.

[0062] In one possible implementation of the second aspect, the power replenishment control device is further configured to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in the output state and the second power conversion circuit to be in the output state based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery when the load power indicated by the load demand of the first load is greater than or equal to the first threshold; wherein, the switching unit is controlled to be in the on state or the off state.

[0063] In one possible implementation of the second aspect, the power replenishment control device is further configured to, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, control the first power conversion circuit to be in an output state, the second power conversion circuit to be in an off state, and the switching unit to be in an on or off state based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on state or off state when the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power information of the second low-voltage battery is greater than or equal to the third threshold, and the load power indicated by the load demand of the first load is less than or equal to the first threshold. The voltage of the second DC power output from the first power conversion circuit is the charging voltage of the first low-voltage battery.

[0064] Optionally, the power replenishment control device is further configured to control the first power conversion circuit to be in an output state, the second power conversion circuit to be in an open state, and the switching unit to be in an on state when the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to a second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to a third threshold, and the load power indicated by the load demand of the first load is less than or equal to the first threshold.

[0065] In one possible implementation of the second aspect, the power replenishment control device is further configured to, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, control the first power conversion circuit to be in an output state, the second power conversion circuit to be in an off state, and the switching unit to be in an on or off state based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on state when the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, and the load power indicated by the load demand of the first load is less than or equal to the first threshold. The first power conversion circuit outputs a second DC power to replenish the first low-voltage battery and the second low-voltage battery. The voltage of the second DC power is the larger of the charging voltage of the first low-voltage battery and the charging voltage of the second low-voltage battery.

[0066] In one possible implementation of the second aspect, the power replenishment control device is further configured to, when the load power indicated by the load demand of the first load is greater than or equal to a first threshold, control the first power conversion circuit to be in an output state, the second power conversion circuit to be in an output state, and the switching unit to be in an on or off state, based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in the output state, the second power conversion circuit to be in the output state, and the switching unit to be in the on state when the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold, and the load power indicated by the load demand of the first load is greater than or equal to the first threshold. The second DC power output from the first power conversion circuit is used to replenish the first low-voltage battery, and the third DC power output from the second power conversion circuit is used to replenish the first low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the first low-voltage battery.

[0067] Optionally, the power replenishment control device is further configured to control the switching unit to be in the conducting state when the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to a second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to a third threshold, and the load power indicated by the load demand of the first load is greater than or equal to the first threshold. The second DC power output from the first power conversion circuit is used to replenish the second low-voltage battery, and the third DC power output from the second power conversion circuit is used to replenish the second low-voltage battery. The voltage of the second DC power is the charging voltage of the second low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery.

[0068] In one possible implementation of the second aspect, the power replenishment control device is further configured to, when the load power indicated by the load demand of the first load is greater than or equal to a first threshold, control the first power conversion circuit to be in an output state, the second power conversion circuit to be in an output state, and the switching unit to be in an on or off state, based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, including: The power replenishment control device is also used to control the first power conversion circuit to be in the output state, the second power conversion circuit to be in the output state, and the switching unit to be in the off state when the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, and the load power indicated by the load demand of the first load is greater than or equal to the first threshold. The second DC power output from the first power conversion circuit is used to charge the first low-voltage battery, and the third DC power output from the second power conversion circuit is used to charge the second low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery.

[0069] In one possible implementation of the second aspect, the power replenishment control device is further configured to, in the event that the first power conversion circuit fails and the second power conversion circuit does not fail, control the operating state of the second power conversion circuit and the on / off state of the switching unit based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, so that the second power conversion circuit replenishes power to the first low-voltage battery and / or the second low-voltage battery.

[0070] In one possible implementation of the second aspect, the power supply control system is applied to the vehicle; The charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery.

[0071] In one possible implementation of the second aspect, the power supply control system is applied to the vehicle; The charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0072] In one possible implementation of the second aspect, the power supply control system is applied to the vehicle; The charging voltage of the second low-voltage battery is determined based on the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery.

[0073] In one possible implementation of the second aspect, the power supply control system is applied to the vehicle; The charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0074] In one possible implementation of the second aspect, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, and the required charging voltage of the second low-voltage battery is the minimum of the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is less than or equal to the first threshold, and the lower limit of the vehicle's electrical voltage is the minimum value among the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery shall be the required charging voltage of the second low-voltage battery; or, When the load power indicated by the load demand of the first load is less than or equal to the first threshold, and the required charging voltage of the second low-voltage battery is greater than or equal to the upper limit of the charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the maximum value between the upper limit of the charging voltage of the second low-voltage battery and the lower limit of the vehicle's electrical voltage; or, When the load power indicated by the load demand of the first load is greater than or equal to the third threshold, the charging voltage of the second low-voltage battery is the maximum value among the upper limit of the charging voltage of the second low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the second low-voltage battery.

[0075] In one possible implementation of the second aspect, when the power supply control system is in a first operating mode, the first low-voltage battery is used to power the first load; or, the second low-voltage battery is used to power the first load. When the power supply control system is in the second operating mode, the first low-voltage battery is used to power the second load, and the second low-voltage battery is used to power the third load; the first load includes the second load and the third load, and the energy consumption of the first operating mode is less than or equal to the energy consumption of the second operating mode.

[0076] Thirdly, embodiments of this application provide a power supply control device, which includes a unit for performing the method as described in any of the first aspects.

[0077] In one possible design, the power replenishment control device includes: A communication unit is used to acquire the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load.

[0078] The processing unit is used to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The power replenishment strategy is used to control the state of the power conversion device connected between the high-voltage battery and the first low-voltage battery and the second low-voltage battery, so that the high-voltage battery replenishes the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0079] Regarding the processing unit and communication unit of the third aspect and any possible implementation, the steps performed thereon can be referred to the corresponding implementation of the first aspect.

[0080] For the technical effects of the third aspect and any possible implementation, please refer to the description of the technical effects corresponding to the first aspect and the corresponding implementation.

[0081] Optionally, in the power supply control device of the third aspect and any of the possible embodiments described above.

[0082] In one implementation, the power replenishment control device is an electronic device. When the power replenishment control device is an electronic device, the communication unit can be a transceiver or an input / output interface. The processing unit can be at least one processor (e.g., at least one of a processor for intelligent driving, a vehicle-mounted processor, or an image signal processor). Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0083] In another implementation, the power-up control device is a chip (system) or circuit used in an electronic device. When the power-up control device is a chip (system) or circuit used in an electronic device, the communication unit can be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin, or related circuit on the chip (system) or circuit. The processing unit can be at least one processor, processing circuit, or logic circuit.

[0084] Fourthly, embodiments of this application provide a power-compensation control device, which includes a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the methods described in the first aspect and any of the possible implementations. Optionally, the power-compensation control device further includes a memory. Optionally, the power-compensation control device further includes a communication interface, and the processor is coupled to the communication interface.

[0085] Fifthly, embodiments of this application provide a chip, including: logic circuitry and an interface. The interface is used to receive or transmit information. The logic circuitry is used to receive or transmit information through the interface, causing the chip to execute the methods described in the first aspect and any of the possible implementations.

[0086] Sixthly, embodiments of this application provide a computer-readable storage medium for storing a computer program (also referred to as code or instructions). When the computer program is run on a computer, the methods described in the first aspect and any of the possible implementations are implemented.

[0087] In a seventh aspect, embodiments of this application provide a computer program product, which includes a computer program (also referred to as code or instructions). When the computer program is run, it causes the computer to perform the methods described in the first aspect and any of the possible implementations.

[0088] Eighthly, embodiments of this application provide a vehicle that includes at least one of the following: a power supply control device of the third aspect, a power supply control device of the fourth aspect, and a chip of the fifth aspect.

[0089] Optionally, the terminal may include a vehicle or security equipment. The vehicle may include commercial vehicles, passenger vehicles, industrial vehicles (such as forklifts, trailers, tractors, etc.), engineering vehicles (such as excavators, bulldozers, cranes, etc.), etc., and this application embodiment does not limit this.

[0090] Optionally, the terminal is used to implement the method described in the first aspect and any possible implementation.

[0091] Furthermore, in the process of implementing any aspect of the first aspect and any possible implementation of the method described above, the processes related to sending and / or receiving information can be understood as the process of the processor outputting information and / or the processor receiving input information. When outputting information, the processor can output the information to a transceiver (or communication interface, or transmitting module) for transmission. After the information is output by the processor, it may require further processing before reaching the transceiver. Similarly, when the processor receives input information, the transceiver (or communication interface, or transmitting module) receives the information and inputs it to the processor. Furthermore, after the transceiver receives the information, it may require further processing before being input to the processor.

[0092] Based on the above principles, for example, the information sent mentioned in the aforementioned method can be understood as information output by the processor. Similarly, the information received can be understood as information received by the processor from input.

[0093] Optionally, unless otherwise specified, or unless they contradict their actual function or internal logic in the relevant description, the operations of the processor, such as transmitting, sending, and receiving, can be more generally understood as processor output and receiving, input, and other operations.

[0094] Optionally, in performing the methods of the first aspect and any possible implementation described above, the processor may be a processor specifically designed to perform these methods, or it may be a processor that performs these methods by executing computer instructions stored in memory, such as a general-purpose processor. The memory may be a non-transitory memory, such as read-only memory (ROM), which may be integrated with the processor on the same chip or disposed on different chips. This application does not limit the type of memory or the arrangement of the memory and processor.

[0095] In one possible implementation, at least one of the aforementioned memories is located outside the device.

[0096] In yet another possible implementation, at least one of the aforementioned memories is located within the device.

[0097] In another possible implementation, a portion of the memory of the at least one memory is located inside the device, while another portion is located outside the device.

[0098] In this application, the processor and memory may also be integrated into a single device, that is, the processor and memory can be integrated together. Attached Figure Description

[0099] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0100] Figure 1 This is a schematic diagram of a power replenishment system provided in an embodiment of this application; Figure 2 This is a schematic diagram of another power supply system provided in an embodiment of this application; Figure 3 This is a schematic diagram of a power supply control system provided in an embodiment of this application; Figure 4 This is a schematic diagram of another power supply control system provided in an embodiment of this application; Figure 5 This is a schematic diagram of another power supply control system provided in an embodiment of this application; Figure 6 A flowchart illustrating a power supply control method provided in an embodiment of this application; Figure 7 A schematic diagram illustrating a power replenishment method for a low-load, low-voltage battery requiring additional power, provided as an embodiment of this application. Figure 8 A schematic diagram illustrating a power replenishment method under low load conditions where both low-voltage batteries require additional power, provided as an embodiment of this application. Figure 9 A schematic diagram illustrating a power replenishment method under high load conditions where a low-voltage battery needs additional power, as provided in an embodiment of this application. Figure 10 A schematic diagram illustrating a power replenishment method under high load conditions where both low-voltage batteries require additional power, provided as an embodiment of this application. Figure 11 A schematic flowchart illustrating a load-change-based power replenishment method provided in an embodiment of this application; Figure 12 A schematic diagram illustrating a power replenishment method in the event of a fault in the first power conversion circuit and the need for recharging of a low-voltage battery, provided as an embodiment of this application. Figure 13 A schematic diagram illustrating a power replenishment method provided in an embodiment of this application when a first power conversion circuit fails and both low-voltage batteries require additional power. Figure 14A schematic diagram illustrating another power replenishment method provided in an embodiment of this application when a first power conversion circuit fails and a low-voltage battery needs to be replenished; Figure 15 A schematic diagram illustrating a power supply strategy and a power replenishment strategy under different driving conditions, provided for embodiments of this application; Figure 16 This is a schematic diagram of the structure of a power supply control device provided in an embodiment of this application; Figure 17 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application; Figure 18 This is a schematic diagram of the structure of a chip provided in an embodiment of this application. Detailed Implementation

[0101] The terminology used in the embodiments of this application will be explained below.

[0102] A high-voltage battery is a battery whose output voltage is greater than or equal to a first set threshold. A high-voltage battery can be composed of multiple smaller batteries connected in series and / or parallel. A high-voltage battery can be a lithium battery (e.g., ternary lithium batteries and lithium iron phosphate batteries). For example, a high-voltage battery can be a power battery or power battery pack in a vehicle. A power battery, also known as a "large battery," can output a voltage of several hundred volts (V), and its capacity is typically tens to hundreds of kilowatt-hours (kWh). The capacity of the power battery directly affects the vehicle's driving range.

[0103] A low-voltage battery is a battery whose output voltage is less than or equal to a second preset threshold. The first preset threshold is greater than or equal to the second preset threshold. A low-voltage battery can be a rechargeable battery (e.g., a lead-acid battery) or a lithium battery (e.g., a lithium iron phosphate battery). For example, a low-voltage battery can be a low-voltage rechargeable battery used in a vehicle. Low-voltage batteries can also be called "small batteries" and can output voltages of approximately 12V, 24V, or 48V. The capacity of a low-voltage battery is generally less than or equal to the capacity of the main battery. Low-voltage batteries can supply power to low-voltage loads in a vehicle.

[0104] A power conversion circuit is an electronic circuit that changes the voltage or current level of electrical energy to meet the needs of different devices. The conversion method of a power conversion circuit can include any of the following: boost, buck, or buck-boost. The control method of a power conversion circuit can include pulse width modulation (PWM) or pulse frequency modulation (PFM). The energy conversion type of a power conversion circuit can include any of the following: direct current to direct current (DC / DC), direct current to alternating current (DC / AC), or alternating current to direct current (AC / DC). For example, a power conversion circuit can be a direct current to direct current (DC / DC) converter in a vehicle.

[0105] A load is any electrical device capable of receiving electrical energy. For example, a load can be a low-voltage load on a vehicle, also known as a low-voltage electrical device. Low-voltage loads can include lighting and signaling systems (e.g., headlights, turn signals, horns, etc.), vehicle control systems (e.g., door locks, windows, wipers, steering modules, electronic parking brakes, etc.), infotainment systems (e.g., vehicle screens, audio systems, dashboards, etc.), and sensors (e.g., LiDAR, millimeter-wave radar, cameras, and other autonomous driving sensors). The supply voltage of a low-voltage load is less than or equal to a certain threshold (e.g., 50V).

[0106] The switching unit can be controlled by a controller to switch its state (the switching unit is in a conducting state or an open state). For example, the switching unit can be any of the following: metal oxide semiconductor field effect transistor (MOSFET), insulated gate bipolar transistor (IGBT), contactor, and relay.

[0107] With the development of vehicle electrification, more and more low-voltage electrical devices are appearing on vehicles. To ensure power redundancy for these devices, vehicles are generally equipped with two low-voltage batteries, so that if one low-voltage battery fails, the other can still power the devices. When the remaining charge of the low-voltage battery is low, it is usually replenished by the vehicle's high-voltage battery (such as the power battery).

[0108] Currently, there are two types of charging systems in vehicles. For example... Figure 1 and Figure 2 As shown.

[0109] Please see Figure 1 , Figure 1 This is a schematic diagram of a power replenishment system provided in an embodiment of this application. Figure 1 As shown, the power replenishment system includes a high-voltage battery, a DC / DC converter, low-voltage battery 1, and low-voltage battery 2. The high-voltage battery can output high-voltage direct current, and the DC / DC converter can convert the high-voltage direct current output from the high-voltage battery into low-voltage direct current. The low-voltage direct current can be used to replenish the power of low-voltage battery 1 and low-voltage battery 2. Figure 1 The low-voltage DC power can also be used to power electrical equipment 1, electrical equipment 2, and electrical equipment 3. Electrical equipment 1, electrical equipment 2, and electrical equipment 3 can be low-voltage loads on the vehicle. Low-voltage battery 1 can power at least one of electrical equipment 1 and electrical equipment 2. Low-voltage battery 2 can power at least one of electrical equipment 2 and electrical equipment 3.

[0110] Figure 1 During the charging process, when one of the low-voltage batteries is fully charged, the charging system will automatically reduce the charging current to prevent overcharging, while continuing to charge the other low-voltage battery. Figure 1 The drawbacks of a single DC / DC converter and dual-battery charging strategy include lower charging efficiency. Because a single DC / DC converter needs to power two low-voltage batteries simultaneously, the charging power is shared between each battery, resulting in slower charging speeds and difficulty meeting the demands of rapid charging. Furthermore, the low-voltage batteries face a higher risk of power overload, especially under high loads (where low-voltage loads have higher power) or extreme conditions. The output power of a single DC / DC converter may not be sufficient to charge both low-voltage batteries simultaneously, easily leading to performance degradation. Additionally, reliability is insufficient, with a higher risk of single-point failure. If the DC / DC converter fails, the charging function for both low-voltage batteries will completely fail, affecting the stability of the vehicle's low-voltage power supply.

[0111] Please see Figure 2 , Figure 2 This is a schematic diagram of another power supply system provided in an embodiment of this application. Figure 2As shown, the power supply system includes a high-voltage battery, a DC / DC converter 1, a DC / DC converter 2, a low-voltage battery 1, and a low-voltage battery 2. The high-voltage battery outputs high-voltage direct current (DC). The DC / DC converter 1 converts the high-voltage DC output from the high-voltage battery into a first low-voltage DC. This first low-voltage DC can be used to power the low-voltage battery 1 and also to supply power to at least one of electrical devices 1, 2, and 3. The DC / DC converter 2 converts the high-voltage DC output from the high-voltage battery into a second low-voltage DC. This second low-voltage DC can be used to power the low-voltage battery 2 and also to supply power to at least one of electrical devices 1, 2, and 3. Electrical devices 1, 2, and 3 can be low-voltage loads on a vehicle. The low-voltage battery 1 can supply power to at least one of electrical devices 1 and 2. The low-voltage battery 2 can supply power to at least one of electrical devices 2 and 3.

[0112] Figure 2 The power replenishment system manages two low-voltage batteries (low-voltage battery 1 and low-voltage battery 2) through two independent DC / DC converters (DC / DC converter 1 and DC / DC converter 2). One DC / DC converter acts as the main power source to supply power to the low-voltage loads of the vehicle (electrical equipment 1, electrical equipment 2, electrical equipment 3, etc.), while the other DC / DC converter serves as a redundant backup, taking over the power supply task when the main power source fails, thereby improving system reliability and safety. Figure 2 The dual DC / DC converter and dual low-voltage battery power supply system provides redundancy, ensuring continued operation even in the event of a single component failure. However, this redundancy also presents challenges in coordinating the operation of the two DC / DC converters and two low-voltage batteries. The dual DC / DC converter and dual low-voltage battery power supply system prioritizes power supply redundancy and system reliability, while neglecting energy management optimization during the power supply process, resulting in room for improvement in power supply efficiency and energy utilization. Furthermore, the coordination mechanism between the dual DC / DC converters and dual low-voltage batteries is not yet perfect, lacking dynamic balance management of the two low-voltage battery states, which may lead to uneven energy distribution or low power supply efficiency during the power supply process.

[0113] This application provides a power replenishment control system that optimizes the power replenishment strategy, dynamically balances the energy distribution during the power replenishment process, improves power replenishment efficiency and system integrity, thereby solving the existing problems of low power replenishment efficiency, suboptimal energy management, and insufficient dynamic adjustment capability.

[0114] Please see Figure 3 , Figure 3 This is a schematic diagram of a power supply control system provided in an embodiment of this application. Figure 3As shown, the power replenishment control system 100 includes: a power conversion device 110, a power replenishment control device 40, a high-voltage battery 50, a first low-voltage battery 60, and a second low-voltage battery 70.

[0115] The power supply control device 40 is used to acquire the load demand of the first load, the remaining power information of the first low-voltage battery 60, and the remaining power information of the second low-voltage battery 70; the first low-voltage battery 60 and / or the second low-voltage battery 70 are used to supply power to the first load. The power replenishment control device 40 is also used to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery 60, and the remaining power information of the second low-voltage battery 70. The power replenishment strategy is used to control the state of the power conversion device 110 so that the high-voltage battery 50 replenishes the first low-voltage battery 60 and / or the second low-voltage battery 70 through the power conversion device 110.

[0116] In this system, the voltage output by the high-voltage battery 50 is greater than or equal to the charging voltage of the low-voltage battery, and the voltage output by the high-voltage battery 50 cannot directly recharge the low-voltage battery. The energy conversion device can convert the energy from the high-voltage battery 50 to the low-voltage battery, thereby enabling the high-voltage battery 50 to recharge the low-voltage battery. For example, the high-voltage battery 50 can recharge at least one of the first low-voltage battery 60 and the second low-voltage battery 70 through the energy conversion device 110. The energy conversion device 110 can be in different states, and in different states, it can perform energy conversion from the high-voltage battery to different low-voltage batteries.

[0117] The power replenishment strategy may include: the object to be replenished and the output power of the power conversion device 110. The power conversion device 110 may have different objects to be replenished and different output power in different states. The object to be replenished may include at least one of the first low-voltage battery 60 and the second low-voltage battery 70.

[0118] In this embodiment, a power replenishment strategy can be determined based on the load requirements of the first load, the remaining power of the first low-voltage battery 60, and the remaining power of the second low-voltage battery 70. The power replenishment strategy takes into account the impact of the load requirements of the first load, thereby improving the power replenishment efficiency of the first low-voltage battery 60 and the second low-voltage battery 70.

[0119] Optionally, the power conversion device may include at least two power conversion circuits and a switching unit. By controlling the states of the at least two power conversion circuits and the switching unit, the high-voltage battery can supply power to the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0120] In one possible example, such as Figure 4As shown, the power conversion device 110 includes a first power conversion circuit 10, a second power conversion circuit 20, and a switching unit 30. The first power conversion circuit 10 converts a first direct current (DC) output from the high-voltage battery into a second DC, so that the second DC supplies power to the first low-voltage battery 60 and / or the second low-voltage battery 70. The voltage of the first DC is greater than or equal to the voltage of the second DC. The second power conversion circuit 20 converts the first DC output from the high-voltage battery into a third DC, so that the third DC supplies power to the first low-voltage battery 60 and / or the second low-voltage battery 70. The voltage of the first DC is greater than or equal to the voltage of the third DC. The switching unit 30 controls the connection or disconnection of the first power conversion circuit 10 with the second low-voltage battery 70, and / or controls the connection or disconnection of the second power conversion circuit 20 with the first low-voltage battery 60.

[0121] When the first power conversion circuit 10 is in the output state, it can convert the first DC power output from the high-voltage battery 50 into a second DC power, and the output terminal of the first power conversion circuit 10 outputs the second DC power. When the first power conversion circuit 10 is in the off state, it stops working, and there is no voltage output at its output terminal.

[0122] When the second power conversion circuit 20 is in the output state, it can convert the first DC power output from the high-voltage battery 50 into a third DC power, and the output terminal of the second power conversion circuit 20 outputs the third DC power. When the second power conversion circuit 20 is in the off state, it stops working, and there is no voltage output at its output terminal. The voltage of the high-voltage battery 50 is greater than or equal to the voltage of the first low-voltage battery 60, and the voltage of the high-voltage battery 50 is greater than or equal to the voltage of the second low-voltage battery 70. The voltage of the high-voltage battery 50 can be its positive terminal voltage, the voltage of the first low-voltage battery 60 can be its positive terminal voltage, and the voltage of the second low-voltage battery 70 can be its positive terminal voltage.

[0123] The switching unit 30 is used to control the connection or disconnection of the first power conversion circuit 10 with the second low-voltage battery 70, and to control the connection or disconnection of the second power conversion circuit 20 with the first low-voltage battery 60. When the switching unit 30 is in the ON state, it can control the connection of either the first power conversion circuit 10 or the second low-voltage battery 70. When the switching unit 30 is in the OFF state, it can control the disconnection of both the first power conversion circuit 10 and the second low-voltage battery 70, and the second power conversion circuit 20 and the first low-voltage battery 60. The state of the switching unit 30 can be directly or indirectly controlled by the power supply control device 40. For example, the power supply control device 40 can control the state of the switching unit 30 through an intelligent distribution unit (IDU).

[0124] For example, when the first power conversion circuit 10 is in the output state and the switching unit 30 is in the conducting state, the switching unit 30 can control the first power conversion circuit 10 to connect with the second low-voltage battery 70. The first power conversion circuit 10 can convert the first DC power output from the high-voltage battery 50 into the second DC power, which is then used by the switching unit 30 to replenish the second low-voltage battery 70.

[0125] When the first power conversion circuit 10 is in the off state, the first DC power output from the high-voltage battery 50 cannot be converted into the second DC power through the first power conversion circuit 10. When the switching unit 30 is in the off state, the second DC power output from the first power conversion circuit 10 cannot be used to replenish the second low-voltage battery 70 through the switching unit 30.

[0126] When the second power conversion circuit 20 is in the output state and the switching unit 30 is in the conducting state, the switching unit 30 can control the second power conversion circuit 20 to connect with the first low-voltage battery 60. The second power conversion circuit 20 can convert the first DC power output from the high-voltage battery 50 into a third DC power, which is then used by the switching unit 30 to replenish the first low-voltage battery 60.

[0127] When the second power conversion circuit 20 is in the off state, the first DC power output from the high-voltage battery 50 cannot be converted into the third DC power through the second power conversion circuit 20. When the switching unit 30 is in the off state, the third DC power output from the second power conversion circuit 20 cannot be used to replenish the first low-voltage battery 60 through the switching unit 30.

[0128] A first low-voltage battery 60 and / or a second low-voltage battery 70 are used to supply power to a first load. The supply voltage of the first load is matched with the voltage of the first low-voltage battery 60, and the supply voltage of the first load is matched with the voltage of the second low-voltage battery 70. The first load may include... Figure 3 or Figure 4 Electrical equipment 1, electrical equipment 2 and electrical equipment 3. Figure 3 or Figure 4 The first low-voltage battery 60 is connected to electrical device 1 and electrical device 2, and the second low-voltage battery 70 is connected to electrical device 2 and electrical device 3. The first low-voltage battery 60 can power at least one of electrical device 1 and electrical device 2. The second low-voltage battery 70 can power at least one of electrical device 2 and electrical device 3. It should be noted that... Figure 3 or Figure 4 The connection relationship between the first low-voltage battery 60, the second low-voltage battery 70, and electrical devices 1, 2, and 3 is one possible example. In another possible example, the first low-voltage battery 60 can be connected to electrical devices 1, 2, and 3, and the second low-voltage battery 70 can be connected to electrical devices 1, 2, and 3. The first low-voltage battery 60 can supply power to at least one of electrical devices 1, 2, and 3. The second low-voltage battery 70 can supply power to at least one of electrical devices 1, 2, and 3.

[0129] Of the first low-voltage battery 60 and the second low-voltage battery 70, one is the main low-voltage battery and the other is the auxiliary low-voltage battery. In driving conditions (e.g., when the vehicle is in motion), the main low-voltage battery is given priority for charging and discharging. In non-driving conditions (e.g., when the vehicle is in sleep mode), the auxiliary low-voltage battery is given priority for charging and discharging.

[0130] The first low-voltage battery 60 and the second low-voltage battery 70 can be configured as a primary low-voltage battery and a secondary low-voltage battery as needed. For example, the power replenishment control device 40 can periodically acquire the state of health (SOH) of the first low-voltage battery 60 and the SOH of the second low-voltage battery 70, and configure the battery with the higher SOH as the primary low-voltage battery.

[0131] The power supply control device 40 is used to obtain the load demand of the first load. The load demand of the first load can be the power of the first load. The power of the first load can include the current power of the first load. The first load can report its own load demand to the power supply control device 40, or the power supply control device 40 can collect the power of the first load through a power sensor, or the power supply control device 40 can collect the voltage and current of the first load through a voltage sensor and a current sensor, thereby obtaining the power of the first load. Alternatively, the power supply control device 40 can obtain the output power of the first power conversion circuit 10, the output power of the second power conversion circuit 20, the power (charging power or discharging power) of the first low-voltage battery 60, and the power (charging power or discharging power) of the second low-voltage battery 70, and calculate the power of the first load based on the output power of the first power conversion circuit 10, the output power of the second power conversion circuit 20, the power of the first low-voltage battery 60, and the power of the second low-voltage battery 70. For example, the power of the first load = the output power of the first power conversion circuit 10 + the output power of the second power conversion circuit 20 - the power of the first low-voltage battery 60 (where the charging power is positive and the discharging power is negative) - the power of the second low-voltage battery 70 (where the charging power is positive and the discharging power is negative).

[0132] The charging control device 40 is used to acquire the remaining power information of the first low-voltage battery 60 and the second low-voltage battery 70. The charging control device 40 can obtain the remaining power of the first low-voltage battery 60 by monitoring its voltage and determining the correspondence between its voltage and remaining power. Alternatively, the charging control device 40 can obtain the charge change of the first low-voltage battery 60 by real-time monitoring its current and performing integration calculations based on the real-time current and operating time. Based on the initial power and charge change of the first low-voltage battery 60, the current remaining power information of the first low-voltage battery 60 is estimated. Alternatively, the first low-voltage battery 60 can report its remaining power information to the charging control device 40. For example, the remaining power information of the battery can be represented by its state of charge (SOC). SOC is the ratio of the battery's remaining usable capacity to its fully charged capacity. For example, if the battery's SOC is 70%, it means that the remaining battery capacity is 70% of the total capacity when fully charged.

[0133] The power replenishment control device 40 is also used to control the operating state of the first power conversion circuit 10, the operating state of the second power conversion circuit 20, and the on / off state of the switching unit 30 based on the load demand of the first load, the remaining power information of the first low-voltage battery 60, and the remaining power information of the second low-voltage battery 70, so as to replenish the first low-voltage battery 60 and / or the second low-voltage battery 70.

[0134] The operating state of the first power conversion circuit 10 may include the first power conversion circuit 10 being in an output state or an off state, and the operating state of the second power conversion circuit 20 may include the second power conversion circuit 20 being in an output state or an off state. The on / off state of the switching unit 30 may include the switching unit 30 being in a conducting state or an off state.

[0135] In this embodiment, the high-voltage battery 50 can replenish the first low-voltage battery 60 or the second low-voltage battery 70 through the first power conversion circuit 10, and the first low-voltage battery 60 or the second low-voltage battery 70 can be replenished through the second power conversion circuit 20. Both the first low-voltage battery 60 and the second low-voltage battery 70 have two replenishment channels, thereby improving the replenishment efficiency of the first low-voltage battery 60 and the second low-voltage battery 70.

[0136] The power replenishment control device 40 is an electronic device with control and / or computing capabilities, or a software module and / or hardware module within an electronic device. For example, the power replenishment control device 40 may be a vehicle's Battery Management System (BMS).

[0137] The power supply control device 40 can implement the power supply control method described below. Examples of hardware and software implementations are given below.

[0138] As an example of hardware implementation, the power supply control device 40 may include at least one processor, which is a module with processing capabilities. In one implementation, the processor includes circuitry with instruction read and execute capabilities, such as an arithmetic logic unit (ALU), processor core, central processing unit (CPU), microprocessor, microcontroller unit (MCU), etc.

[0139] As an example of a software implementation, the power supply control device 40 may include software functional units. As another example of a software functional unit, the power supply control device 40 includes one or more of an executable computer program, computer code, or computer instructions, where "executable" means capable of running on a processor or computing instance.

[0140] In one possible implementation, the high-voltage battery 50 is connected to the input terminal of the first power conversion circuit 10 and the input terminal of the second power conversion circuit 20, respectively; the output terminal of the first power conversion circuit 10 is connected to the first low-voltage battery 60 and to the second low-voltage battery 70 through a switching unit; the output terminal of the second power conversion circuit 20 is connected to the second low-voltage battery 70 and to the first low-voltage battery 60 through a switching unit.

[0141] In this circuit, the positive terminal of the high-voltage battery 50 is connected to the input terminal of the first power conversion circuit 10, and the positive terminal of the high-voltage battery 50 is connected to the input terminal of the second power conversion circuit 20. The output terminal of the first power conversion circuit 10 is connected to the positive terminal of the first low-voltage battery 60 and the first terminal of the switching unit, and the output terminal of the second power conversion circuit 20 is connected to the positive terminal of the second low-voltage battery 70 and the second terminal of the switching unit. When the switching unit is in the ON state, the output terminal of the first power conversion circuit 10 is connected to the positive terminal of the second low-voltage battery 70, or the output terminal of the second power conversion circuit 20 is connected to the positive terminal of the first low-voltage battery 60. When the switching unit is in the OFF state, the output terminal of the first power conversion circuit 10 is disconnected from the positive terminal of the second low-voltage battery 70, or the output terminal of the second power conversion circuit 20 is disconnected from the positive terminal of the first low-voltage battery 60.

[0142] In another possible example, such as Figure 5 As shown, Figure 5 The power conversion device 110 also includes a third power conversion circuit 80, which converts the first DC power output from the high-voltage battery 50 into a fourth DC power, so that the fourth DC power supplies power to the first low-voltage battery 60 and / or the second low-voltage battery 70. The voltage of the first DC power is greater than or equal to the voltage of the fourth DC power. The switching unit 30 controls the connection or disconnection of the third power conversion circuit with the first low-voltage battery 60, and / or controls the connection or disconnection of the third power conversion circuit with the second low-voltage battery 70. Figure 5 As shown, the switching unit 30 may include a first switch 31 and a second switch 32. The first switch 31 is used to control the connection or disconnection of the first power conversion circuit 10 with the second low-voltage battery 70, and / or to control the connection or disconnection of the second power conversion circuit 20 with the first low-voltage battery 60. The second switch 32 is used to control the connection or disconnection of the third power conversion circuit 80 with the first low-voltage battery 60. The first switch 31 and the second switch 32 are used to control the connection or disconnection of the third power conversion circuit 80 with the second low-voltage battery 70. The first switch 31 and the second switch 32 can be any one of a MOSFET, an IGBT, a contactor, or a relay. For example, both the first switch 31 and the second switch 32 are MOSFETs.

[0143] The above-described power supply control system can be applied to the method embodiments described below.

[0144] Please see Figure 6 , Figure 6 This is a flowchart illustrating a power replenishment control method provided in an embodiment of this application. This power replenishment control method can be used in the aforementioned power replenishment control system 100. For example... Figure 6 The power replenishment control method shown may include steps 601 to 602. The order of these steps is merely an example, and the embodiments of this application are equally applicable to other step execution orders, multiple executions of a particular step, etc. Steps 601 to 602 are as follows: 601, the power replenishment control device acquires the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery.

[0145] The power supply control device is a device with control capability and / or computing capability. For example, the power supply control device can be the power supply control device 40 described above.

[0146] The load demand of the first load can be the power of the first load. The power of the first load can include the current power of the first load. The power supply control device can obtain the load demand of the first load in any of the following four ways.

[0147] Method 1: The first load can report its load demand to the power supply control device. The first load can periodically report its current power or current operating voltage and current to the power supply control device. The power supply control device obtains the current power or current operating voltage and current of the first load, thereby determining the load demand of the first load.

[0148] Method 2: The power supply control device can collect the voltage and current of the first load through voltage and current sensors, calculate the power of the first load, and thus obtain the load demand of the first load.

[0149] Method 3: The power replenishment control device can calculate the power of the first load based on the output power of the power conversion device, the power (charging power or discharging power) of the first low-voltage battery, and the power (charging power or discharging power) of the second low-voltage battery. For example, the power of the first load = output power of the power conversion device - power of the first low-voltage battery (where charging power is positive and discharging power is negative) - power of the second low-voltage battery (where charging power is positive and discharging power is negative).

[0150] Method 4: The power supply control device can determine the load demand of the first load by acquiring the load signal output by the power conversion device. If the load signal output by the power conversion device is a low-voltage load signal, it indicates that the load power indicated by the load demand of the first load is low (e.g., the load power indicated by the load demand of the first load is less than or equal to a first threshold). If the load signal output by the power conversion device is a high-voltage load signal, it indicates that the load power indicated by the load demand of the first load is high (e.g., the load power indicated by the load demand of the first load is greater than or equal to a first threshold).

[0151] The remaining power information of the first low-voltage battery may include the state of charge (SOC) of the first low-voltage battery, and the remaining power information of the second low-voltage battery may include the state of charge (SOC) of the first low-voltage battery.

[0152] The power replenishment control device can obtain the remaining power information of the first low-voltage battery through any of the following three methods.

[0153] Method 1: The power replenishment control device can monitor the voltage of the first low-voltage battery and obtain the remaining power of the first low-voltage battery based on the correspondence between the voltage of the first low-voltage battery and the remaining power.

[0154] Method 2: The power replenishment control device can monitor the current of the first low-voltage battery in real time, and perform integral calculations based on the real-time current and the operating time of the first low-voltage battery to obtain the charge change of the first low-voltage battery. Based on the initial charge and charge change of the first low-voltage battery, the remaining charge information of the first low-voltage battery can be estimated.

[0155] Method 3: The first low-voltage battery can report its remaining power information to the power replenishment control device.

[0156] The method by which the power replenishment control device obtains the remaining power information of the second low-voltage battery is similar to the method by which it obtains the remaining power information of the first low-voltage battery, and will not be described in detail here.

[0157] 602, the power replenishment control device determines a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The power replenishment strategy is used to control the state of the power conversion device so that the high-voltage battery replenishes the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0158] The power replenishment strategy may include: the object to be replenished and the output power of the power conversion device. The power conversion device may have different objects to be replenished and different output power depending on its state. The object to be replenished may include at least one of a first low-voltage battery and a second low-voltage battery.

[0159] In this embodiment, a power replenishment strategy can be determined based on the load demand of the first load, the remaining power of the first low-voltage battery, and the remaining power of the second low-voltage battery. The power replenishment strategy takes into account the impact of the load demand of the first load, thereby improving the power replenishment efficiency of the first and second low-voltage batteries.

[0160] In the case where the power conversion device includes a first power conversion circuit, a second power conversion circuit, and a switching unit, the first power conversion circuit is used to convert the first DC power output from the high-voltage battery into a second DC power, so that the second DC power supplies power to the first low-voltage battery and / or the second low-voltage battery, and the voltage of the first DC power is greater than or equal to the voltage of the second DC power; the second power conversion circuit is used to convert the first DC power output from the high-voltage battery into a third DC power, so that the third DC power supplies power to the first low-voltage battery and / or the second low-voltage battery, and the voltage of the first DC power is greater than or equal to the voltage of the third DC power; the voltage of the high-voltage battery is greater than or equal to the voltage of the first low-voltage battery and the voltage of the second low-voltage battery; the switching unit is used to control the connection or disconnection of the first power conversion circuit with the first low-voltage battery, and to control the connection or disconnection of the second power conversion circuit with the second low-voltage battery, and the first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load.

[0161] In this embodiment, the high-voltage battery can replenish either the first low-voltage battery or the second low-voltage battery via a first power conversion circuit, and vice versa. The first low-voltage battery can be replenished via either the first or second power conversion circuit. Similarly, the second low-voltage battery can be replenished via either the second or first power conversion circuit. Both the first and second low-voltage batteries support two replenishment channels, thereby improving their replenishment efficiency.

[0162] To make it easier to understand, several ways to recharge the first low-voltage battery and / or the second low-voltage battery are introduced below.

[0163] Implementation method 1: Power replenishment strategy under low load conditions.

[0164] When the load power indicated by the load demand of the first load is less than or equal to the first threshold, the power replenishment control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on or off state based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery.

[0165] The first power conversion circuit is used to convert the first DC power output from the high-voltage battery into a second DC power, and the second DC power is used to replenish the first low-voltage battery and / or the second low-voltage battery.

[0166] The first threshold can be a preset value. This first threshold can be positively correlated with the total rated power of the low-voltage load configured on the vehicle. For example, the first threshold can be set to 1.5 kilowatts (kW).

[0167] If the load demand indicated by the first load is less than or equal to the first threshold, it indicates that the load demand indicated by the first load is low and it is in a low-load condition. At this time, activating one power conversion circuit is sufficient to meet the load demand of the first load and the charging demand of the low-voltage battery, so that the other power conversion circuit does not work, thereby extending the life of the other power conversion circuit.

[0168] The methods for replenishing power under low load conditions can be divided into the following two cases: Case 1: Power replenishment strategy under low load conditions where a low-voltage battery needs to be recharged.

[0169] When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold (indicating that the first low-voltage battery needs to be recharged), the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold (indicating that the second low-voltage battery does not need to be recharged), and the load power indicated by the load demand of the first load is less than or equal to the first threshold (indicating a low load condition), the recharge control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on or off state.

[0170] The second DC power output from the first power conversion circuit is used to recharge the first low-voltage battery, and the voltage of the second DC power is the charging voltage of the first low-voltage battery. The charging voltage of the first low-voltage battery can be calculated in advance. The calculation method for the charging voltage of the first low-voltage battery can be found in the following embodiment. After obtaining the charging voltage of the first low-voltage battery, the electrical control device controls the output voltage of the first power conversion circuit (the voltage of the second DC power) so that the output voltage of the first power conversion circuit is equal to the charging voltage of the first low-voltage battery.

[0171] In this embodiment, the second threshold and the third threshold can be preset values. The second threshold can be related to the capacity of the first low-voltage battery (e.g., the second threshold is positively correlated with the capacity of the first low-voltage battery). The third threshold can be related to the capacity of the second low-voltage battery (e.g., the third threshold is positively correlated with the capacity of the second low-voltage battery). The second threshold can be a value less than or equal to 100%. For example, if the remaining charge is at SOC, the second threshold can be set to 90%, and the third threshold can be set to 90%. When the capacities of the first and second low-voltage batteries are equal, the second and third thresholds can be set to equal values. When the capacities of the first and second low-voltage batteries are unequal, the second and third thresholds can be set to equal or unequal values.

[0172] If the first power conversion circuit is in the output state and the second power conversion circuit is in the off state, it indicates that the first power conversion circuit is working and the second power conversion circuit is not working.

[0173] Please see Figure 7 , Figure 7 This diagram illustrates a power replenishment method for a low-load, low-voltage battery requiring additional power, as provided in an embodiment of this application. The second threshold is 90%, and the third threshold is 90%. Figure 7 As shown, the remaining charge of the first low-voltage battery is 70%, less than or equal to the second threshold, and the remaining charge of the second low-voltage battery is 100%, greater than or equal to the third threshold. At this point, the first low-voltage battery needs recharging, while the second low-voltage battery does not, and both are under low load. The recharging control device controls the first power conversion circuit to be in output mode, the second power conversion circuit to be in open mode, and the switching unit to be in either on or off mode. The recharging path for the first low-voltage battery (e.g., ...) is as follows: Figure 7 The thick line shown represents: high-voltage battery → first power conversion circuit → first low-voltage battery. It should be noted that the switching unit can be in an on or off state. When the voltage difference between the first low-voltage battery and the second low-voltage battery is small (for example, the first and second low-voltage batteries are of the same type, and the voltage difference between them is within 3V), the switching unit can be controlled to be in the on state. On the one hand, if the remaining charge of the second low-voltage battery is detected to be less than or equal to the third threshold, then there is no need to change the state of the switching unit, and the high-voltage battery can replenish the second low-voltage battery through the first power conversion circuit. On the other hand, the second DC power output from the first power conversion circuit can supply power to the device 3 through the switching unit. Furthermore, since the voltage difference between the first and second low-voltage batteries is small, if the first low-voltage battery needs replenishment but the second low-voltage battery does not, even if the switching unit is on, due to the on-state voltage drop of the switching unit (e.g., MOSFET) (typically a few tenths of a volt to a few volts), the voltage of the second low-voltage battery will not flow back to the first power conversion circuit through the switching unit. When the voltage difference between the first low-voltage battery and the second low-voltage battery is significant (for example, the first and second low-voltage batteries are of different models, and the voltage difference is greater than 10V), the switching unit can be controlled to be in the open state to prevent the voltage of the second low-voltage battery from flowing back to the first power conversion circuit through the switching unit, thereby improving the safety of power replenishment. Furthermore, when the switching unit is in the open state, the electrical device 3 can be powered by the second low-voltage battery.

[0174] In this embodiment of the application, when the load demand of the first load is low, the first low-voltage battery needs to be recharged, and the second low-voltage battery does not need to be recharged, the high-voltage battery can recharge the first low-voltage battery through the first power conversion circuit. At this time, the second power conversion circuit does not work, which can take into account the recharge efficiency of the first low-voltage battery and extend the life of the second power conversion circuit.

[0175] Scenario 2: Power replenishment strategy under low load conditions where both low-voltage batteries require additional power.

[0176] When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, and the load power indicated by the load demand of the first load is less than or equal to the first threshold, the power replenishment control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on state. The second DC power output from the first power conversion circuit is used to replenish the first and second low-voltage batteries. The voltage of the second DC power is the larger of the charging voltages of the first and second low-voltage batteries. The charging voltages of the first and second low-voltage batteries can be pre-calculated. The calculation method for the charging voltages of the first and second low-voltage batteries can be found in the following embodiment. After obtaining the charging voltages of the first and second low-voltage batteries, the electronic control device controls the output voltage of the first power conversion circuit (the voltage of the second DC power) so that the output voltage of the first power conversion circuit is equal to the larger of the charging voltages of the first and second low-voltage batteries. This prevents the low-voltage battery corresponding to the larger charging voltage from recharging the low-voltage battery corresponding to the smaller charging voltage, thus ensuring the replenishment effect of the low-voltage battery corresponding to the larger charging voltage.

[0177] In this embodiment of the application, the relevant descriptions of the second threshold and the third threshold can be found in Case 1 above, and will not be repeated here.

[0178] If the first power conversion circuit is in the output state and the second power conversion circuit is in the off state, it indicates that the first power conversion circuit is working and the second power conversion circuit is not working.

[0179] Please see Figure 8 , Figure 8 This diagram illustrates a power replenishment method for a scenario where both low-voltage batteries require additional power, as provided in an embodiment of this application. The second threshold is 90%, and the third threshold is 90%. Figure 8 As shown, the remaining charge of the first low-voltage battery is 70%, which is less than or equal to the second threshold. The remaining charge of the second low-voltage battery is 70%, which is less than or equal to the third threshold. At this time, both the first and second low-voltage batteries need to be recharged, and they are under low load conditions. The recharge control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the off state, and the switching unit to be in the on state. The recharge path of the first low-voltage battery (e.g.) Figure 8 The charging path A shown is: high-voltage battery → first power conversion circuit → first low-voltage battery. The charging path for the second low-voltage battery (as shown) is... Figure 8 The power replenishment path B shown is: high-voltage battery → first power conversion circuit → switching unit → second low-voltage battery.

[0180] In this embodiment, when the load demand of the first load is low and both the first and second low-voltage batteries need recharging, the high-voltage battery can simultaneously recharge both the first and second low-voltage batteries via the first power conversion circuit. At this time, the second power conversion circuit is not operational, thus balancing the recharging efficiency of both batteries and extending the lifespan of the second power conversion circuit.

[0181] Implementation method 2: Power replenishment strategy under high load conditions.

[0182] When the load power indicated by the load demand of the first load is greater than or equal to the first threshold, the power replenishment control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the output state, and the switching unit to be in the on or off state based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery.

[0183] The second DC power output from the first power conversion circuit is used to replenish the first low-voltage battery and / or the second low-voltage battery, and the third DC power output from the second power conversion circuit is used to replenish the first low-voltage battery and / or the second low-voltage battery.

[0184] In this embodiment, the relevant description of the first threshold can be found in Implementation 1 above, and will not be repeated here. If the load power indicated by the load demand of the first load is greater than or equal to the first threshold, it indicates that the load power indicated by the load demand of the first load is high, and it is in a high load condition. At this time, it is difficult to meet the load demand of the first load and the charging demand of the low-voltage battery by using only one power conversion circuit. Therefore, two power conversion circuits can work simultaneously to improve the charging efficiency of the low-voltage battery.

[0185] Power replenishment strategies under high load conditions can be divided into the following two cases: Case A: Power replenishment strategy under high load and when a low-voltage battery needs to be recharged.

[0186] When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold (indicating that the first low-voltage battery needs to be recharged), the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold (indicating that the second low-voltage battery does not need to be recharged), and the load power indicated by the load demand of the first load is greater than or equal to the first threshold (indicating a high load condition), the recharge control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the output state, and the switching unit to be in the conducting state.

[0187] In this circuit, the second DC power output from the first power conversion circuit is used to charge the first low-voltage battery, and the third DC power output from the second power conversion circuit is also used to charge the first low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is also the charging voltage of the first low-voltage battery. The charging voltage of the first low-voltage battery can be calculated in advance. The calculation method for the charging voltage of the first low-voltage battery can be found in the following embodiment. After obtaining the charging voltage of the first low-voltage battery, the electronic control device controls the output voltage of the first power conversion circuit (the voltage of the second DC power) and the output voltage of the second power conversion circuit (the voltage of the third DC power) so that the output voltage of the first power conversion circuit is equal to the charging voltage of the first low-voltage battery, and the output voltage of the second power conversion circuit is equal to the charging voltage of the first low-voltage battery.

[0188] In this embodiment of the application, the relevant descriptions of the second threshold and the third threshold can be found in Case 1 above.

[0189] If both the first and second power conversion circuits are in output mode, it indicates that both the first and second power conversion circuits are working.

[0190] Please see Figure 9 , Figure 9 This diagram illustrates a power replenishment method under high load conditions where a low-voltage battery needs additional power, as provided in an embodiment of this application. The second threshold is 90%, and the third threshold is 90%. Figure 9 As shown, the remaining charge of the first low-voltage battery is 70%, less than or equal to the second threshold, and the remaining charge of the second low-voltage battery is 100%, greater than or equal to the third threshold. At this point, the first low-voltage battery needs recharging, while the second low-voltage battery does not. Under high load conditions, the recharging control device controls the first power conversion circuit and the second power conversion circuit to be in output state, and the switching unit to be in conduction state. The recharging path for the first low-voltage battery (e.g., ...) is as follows: Figure 9 The thick lines shown represent two paths: power supply path A and power supply path B. Power supply path A is: high-voltage battery → first power conversion circuit → first low-voltage battery. Power supply path B is: high-voltage battery → second power conversion circuit → switching unit → first low-voltage battery.

[0191] In this embodiment of the application, when the load demand of the first load is high, the first low-voltage battery needs to be recharged, and the second low-voltage battery does not need to be recharged, the high-voltage battery can simultaneously recharge the first low-voltage battery through the first power conversion circuit and the second power conversion circuit. The first low-voltage battery can be recharged through two recharge paths at the same time, thereby improving the recharge efficiency of the first low-voltage battery.

[0192] Scenario B: Power replenishment strategy under high load conditions where both low-voltage batteries require additional power.

[0193] When the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold, the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, and the load power indicated by the load demand of the first load is greater than or equal to the first threshold, the power replenishment control device controls the first power conversion circuit to be in the output state, the second power conversion circuit to be in the output state, and the switching unit to be in the off state. In this circuit, the second DC power output from the first power conversion circuit is used to charge the first low-voltage battery, and the third DC power output from the second power conversion circuit is used to charge the second low-voltage battery. The voltage of the second DC power is the charging voltage of the first low-voltage battery, and the voltage of the third DC power is the charging voltage of the second low-voltage battery. The charging voltages of the first and second low-voltage batteries can be calculated in advance. The calculation method for the charging voltages of the first and second low-voltage batteries can be found in the following embodiment. After obtaining the charging voltages of the first and second low-voltage batteries, the electronic control device controls the output voltage of the first power conversion circuit (the voltage of the second DC power) and the output voltage of the second power conversion circuit (the voltage of the third DC power) so that the output voltage of the first power conversion circuit is equal to the charging voltage of the first low-voltage battery, and the output voltage of the second power conversion circuit is equal to the charging voltage of the second low-voltage battery.

[0194] In this embodiment of the application, the relevant descriptions of the second threshold and the third threshold can be found in Case 1 above, and will not be repeated here.

[0195] If both the first and second power conversion circuits are in output mode, it indicates that both the first and second power conversion circuits are working.

[0196] Please see Figure 10 , Figure 10 This diagram illustrates a power replenishment method under high load conditions where both low-voltage batteries require additional power, as provided in an embodiment of this application. The second threshold is 90%, and the third threshold is 90%. Figure 10 As shown, the remaining charge of the first low-voltage battery is 70%, which is less than or equal to the second threshold. The remaining charge of the second low-voltage battery is 70%, which is less than or equal to the third threshold. At this time, both the first and second low-voltage batteries need to be recharged, and they are under high load. The recharge control device controls the first power conversion circuit and the second power conversion circuit to be in output state, and the switching unit to be in open state. The recharge path of the first low-voltage battery (e.g.) Figure 10 The charging path A shown is: high-voltage battery → first power conversion circuit → first low-voltage battery. The charging path for the second low-voltage battery (as shown) is... Figure 10The power replenishment path B shown is: high-voltage battery → second power conversion circuit → second low-voltage battery.

[0197] In this embodiment, when the load demand of the first load is high and both the first and second low-voltage batteries need recharging, the high-voltage battery can recharge the first low-voltage battery through the first power conversion circuit, and the high-voltage battery can recharge the second low-voltage battery through the second power conversion circuit. This can improve the recharging efficiency of the first and second low-voltage batteries.

[0198] Please see Figure 11 , Figure 11 This is a schematic flowchart of a power replenishment method based on load changes, provided as an embodiment of this application. Figure 11 Can be applied to Figure 4 The power supply control system shown. Figure 11 The power replenishment method shown may include steps 1101 to 1108.

[0199] 1101, The power replenishment control device monitors the remaining power of the first low-voltage battery and the remaining power of the second low-voltage battery.

[0200] 1102, the power replenishment control device determines the low-voltage battery that needs to be replenished based on the remaining power of the first low-voltage battery and the remaining power of the second low-voltage battery.

[0201] Specifically, if the remaining charge of the first low-voltage battery is less than or equal to a second threshold, it is determined that the first low-voltage battery needs to be recharged; if the remaining charge of the first low-voltage battery is greater than or equal to the second threshold, it is determined that the first low-voltage battery does not need to be recharged. Similarly, if the remaining charge of the second low-voltage battery is less than or equal to a third threshold, it is determined that the second low-voltage battery needs to be recharged; if the remaining charge of the second low-voltage battery is greater than or equal to the third threshold, it is determined that the second low-voltage battery does not need to be recharged.

[0202] 1103. If the first low-voltage battery needs to be recharged but the second low-voltage battery does not, the recharge control device determines the charging voltage of the first low-voltage battery.

[0203] 1104. Under low load conditions, the power replenishment control device controls the output voltage of the first power conversion circuit to be the charging voltage of the first low-voltage battery, so that the second DC power output by the first power conversion circuit replenishes the first low-voltage battery until the first low-voltage battery is replenished to 100%.

[0204] When the first low-voltage battery needs to be recharged, the second low-voltage battery does not need to be recharged, and the circuit is under low load, the first power conversion circuit is in the output state, and the second power conversion circuit is in the off state.

[0205] 1105. Under high load conditions, the power replenishment control device controls the output voltage of the first power conversion circuit to be the charging voltage of the first low-voltage battery, and controls the output voltage of the second power conversion circuit to be the charging voltage of the first low-voltage battery, so that the second DC power output by the first power conversion circuit replenishes the first low-voltage battery, and the third DC power output by the second power conversion circuit replenishes the first low-voltage battery, until the first low-voltage battery is replenished to 100%.

[0206] High load condition: The load power indicated by the load demand of the first load is greater than or equal to the first threshold. When the first low-voltage battery needs to be recharged, the second low-voltage battery does not need to be recharged, and under high load conditions, the first power conversion circuit is in the output state, the second power conversion circuit is in the output state, the switching unit is in the conducting state, and the first power conversion circuit and the second power conversion circuit simultaneously recharge the first low-voltage battery, thereby improving the recharging efficiency of the first low-voltage battery.

[0207] 1106. If the first low-voltage battery needs to be recharged and the second low-voltage battery needs to be recharged, the recharge control device determines the charging voltage of the first low-voltage battery and the charging voltage of the second low-voltage battery.

[0208] 1107. Under low load conditions, the power supply control device controls the output voltage of the first power conversion circuit to the first charging voltage, which is the larger of the charging voltage of the first low-voltage battery and the charging voltage of the second low-voltage battery, so that the second DC power output by the first power conversion circuit can simultaneously supply power to the first low-voltage battery and the second low-voltage battery.

[0209] When the first low-voltage battery needs to be recharged, the second low-voltage battery needs to be recharged, and the load is low, the first power conversion circuit is in the output state, the second power conversion circuit is in the off state, and the switching unit is in the on state.

[0210] 1108. Under high load conditions, the power supply control device controls the output voltage of the first power conversion circuit to be the charging voltage of the first low-voltage battery, so that the second DC power output by the first power conversion circuit can supply power to the first low-voltage battery; the power supply control device controls the output voltage of the second power conversion circuit to be the charging voltage of the second low-voltage battery, so that the third DC power output by the second power conversion circuit can supply power to the second low-voltage battery.

[0211] After performing steps 1107 and 1108, if the second low-voltage battery is charged to 100% while the first low-voltage battery is not charged to 100%, then step 1103 can be performed.

[0212] When both the first and second low-voltage batteries require recharging and are under high load, the first and second power conversion circuits are in output mode, and the switching unit is in off mode. The first power conversion circuit recharges the first low-voltage battery, and the second power conversion circuit recharges the second low-voltage battery, thereby improving the recharging efficiency of the first and second low-voltage batteries.

[0213] The following describes how to calculate the charging voltage of the first low-voltage battery.

[0214] In one possible implementation, the charging control system is applied to the vehicle. The calculation of the charging voltage of the first low-voltage battery can be divided into the following two cases.

[0215] Scenario 1: When the required charging voltage of the first low-voltage battery can be obtained, the charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery.

[0216] Scenario 2: If the required charging voltage of the first low-voltage battery cannot be obtained, the charging voltage of the first low-voltage battery shall be the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0217] The upper limit of the charging voltage of the first low-voltage battery can be obtained based on the battery temperature and voltage of the first low-voltage battery. For example, it can be obtained based on the real-time battery temperature and voltage of the first low-voltage battery, as well as a table showing the correspondence between the temperature, voltage, and upper limit of the charging voltage of the first low-voltage battery.

[0218] The minimum electrical voltage limit for a vehicle can be the lowest electrical voltage required for the entire vehicle. This minimum electrical voltage limit can be a fixed value. For example, the minimum electrical voltage limit for a vehicle can be a value between 11V and 13V. For instance, the minimum electrical voltage limit for a vehicle can be 12V.

[0219] The required charging voltage for the first low-voltage battery can be a charging voltage that maximizes its lifespan. The charging control device can calculate the required charging voltage for the first low-voltage battery based on factors such as the load power supply and quiescent current.

[0220] In this embodiment, the charging voltage of the first low-voltage battery is a voltage determined by the charging control device that is suitable for charging the first low-voltage battery. There are two scenarios: Scenario 1: When the required charging voltage of the first low-voltage battery can be obtained, the charging voltage of the first low-voltage battery is determined based on the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery, which can improve the accuracy of the charging voltage of the first low-voltage battery. Scenario 2: When the required charging voltage of the first low-voltage battery cannot be obtained, the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage, which can improve the charging speed of the first low-voltage battery, thereby improving the charging efficiency of the first low-voltage battery.

[0221] It is understandable that the required charging voltage and the upper limit of the charging voltage of the first low-voltage battery can be real-time changing values, and the charging voltage of the first low-voltage battery can also be real-time changing values. The charging control device can periodically acquire the required charging voltage and the upper limit of the charging voltage of the first low-voltage battery, thereby periodically obtaining the charging voltage of the first low-voltage battery.

[0222] In one possible implementation, when condition 1 above is met, the charging voltage of the first low-voltage battery can be calculated based on the load power indicated by the load demand of the first load. When the load power indicated by the load demand of the first load is less than or equal to a first threshold, the charging voltage of the first low-voltage battery is calculated as follows: When the load power indicated by the load demand of the first load is less than or equal to the first threshold (under low load condition), and the required charging voltage of the first low-voltage battery is the minimum value among the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the lower limit of the vehicle's electrical voltage.

[0223] When the load power indicated by the load demand of the first load is less than or equal to the first threshold (under low load condition), and the lower limit of the vehicle's electrical voltage is the minimum of the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the required charging voltage of the first low-voltage battery.

[0224] When the load power indicated by the load demand of the first load is less than or equal to the first threshold (under low load condition), and the required charging voltage of the first low-voltage battery is greater than or equal to the upper limit of the charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the maximum value between the upper limit of the charging voltage of the first low-voltage battery and the lower limit of the vehicle's electrical voltage.

[0225] In this embodiment, when the load power indicated by the load demand of the first load is less than or equal to a first threshold, it indicates a low load condition. At this time, the charging voltage of the first low-voltage battery is the median value (neither the maximum nor the minimum) of the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery. This balances the charging efficiency and lifespan of the first low-voltage battery. If the required charging voltage of the first low-voltage battery is ReqChrgU1, the upper limit of the charging voltage of the first low-voltage battery is BatMaxVolt, and the lower limit of the vehicle's electrical voltage is SysMinVolt. If ReqChrgU1 < SysMinVolt < BatMaxVolt, then the charging voltage of the first low-voltage battery is SysMinVolt. If SysMinVolt < ReqChrgU1 < BatMaxVolt, then the charging voltage of the first low-voltage battery is ReqChrgU1. If SysMinVolt < BatMaxVolt < ReqChrgU1, then the charging voltage of the first low-voltage battery is BatMaxVolt.

[0226] When the load power indicated by the load demand of the first load is greater than or equal to the first threshold, the charging voltage of the first low-voltage battery is calculated as follows: When the load power indicated by the load demand of the first load is greater than or equal to the first threshold, the charging voltage of the first low-voltage battery is the maximum value among the upper limit of the charging voltage of the first low-voltage battery, the lower limit of the vehicle's electrical voltage, and the required charging voltage of the first low-voltage battery.

[0227] In this embodiment of the application, under high load conditions, a higher charging voltage is used to accelerate the charging speed of the first low-voltage battery.

[0228] In this embodiment, if the charging voltage of the first low-voltage battery is too high, it will affect the lifespan of the first low-voltage battery; if the charging voltage of the first low-voltage battery is too low, it will affect the charging efficiency of the first low-voltage battery. The charging control device can determine the charging voltage of the first low-voltage battery based on the size of the first load, the upper limit of the charging voltage of the first low-voltage battery, the required charging voltage of the first low-voltage battery, and the minimum power consumption voltage of the vehicle, thus balancing the charging efficiency and lifespan of the first low-voltage battery.

[0229] The calculation method for the charging voltage of the second low-voltage battery can refer to the calculation method for the charging voltage of the first low-voltage battery, and will not be repeated here.

[0230] Figures 6 to 11This is the power replenishment strategy assuming both the first and second power conversion circuits are functioning normally. If either the first or second power conversion circuit fails, the power replenishment strategy will change, as explained in detail below.

[0231] In one possible implementation, if the first power conversion circuit fails but the second power conversion circuit does not fail, the power replenishment control device controls the operating state of the second power conversion circuit and the on / off state of the switching unit based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery, so that the second power conversion circuit replenishes the first low-voltage battery and / or the second low-voltage battery.

[0232] In this embodiment of the application, when one of the first power conversion circuit and the second power conversion circuit fails, the high-voltage battery can replenish the first low-voltage battery and / or the second low-voltage battery through the other power conversion circuit, which can improve the replenishment efficiency under the fault of the power conversion circuit.

[0233] In this embodiment, the power replenishment method when the first power conversion circuit fails is determined based on the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery. Specifically, it can be divided into the following three cases.

[0234] In scenario one, if the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold (indicating that the first low-voltage battery needs to be recharged), and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to the third threshold (indicating that the second low-voltage battery does not need to be recharged), the recharge control device controls the second power conversion circuit to be in the output state and the switching unit to be in the conducting state.

[0235] The second power conversion circuit converts the first DC power output from the high-voltage battery into a third DC power. This third DC power is used to recharge the first low-voltage battery, and its voltage is the charging voltage of the first low-voltage battery. The charging voltage of the first low-voltage battery can be calculated in advance. The calculation method for the charging voltage of the first low-voltage battery can be found in the above embodiment. After obtaining the charging voltage of the first low-voltage battery, the electrical control device controls the output voltage of the second power conversion circuit (the voltage of the third DC power) so that the output voltage of the second power conversion circuit is equal to the charging voltage of the first low-voltage battery.

[0236] In this embodiment, the descriptions of the second and third thresholds can be found in Case 1 above, and will not be repeated here. When the second power conversion circuit is in the output state, it indicates that the second power conversion circuit is working.

[0237] Please see Figure 12 , Figure 12This is a schematic diagram illustrating a power replenishment method in the event of a fault in the first power conversion circuit and a low-voltage battery requiring additional power, as provided in an embodiment of this application. The second threshold is 90%, and the third threshold is 90%. Figure 12 As shown, the remaining charge of the first low-voltage battery is 70%, which is less than or equal to the second threshold, and the remaining charge of the second low-voltage battery is 100%, which is greater than or equal to the third threshold. At this point, the first low-voltage battery needs recharging, while the second low-voltage battery does not. The recharging control device controls the second power conversion circuit to be in the output state, and the switching unit to be in the conducting state. The recharging path for the first low-voltage battery (e.g.) Figure 12 The thick lines shown represent: high-voltage battery → second power conversion circuit → switching unit → first low-voltage battery. In this embodiment of the application, when the first power conversion circuit fails and the first low-voltage battery needs to be recharged while the second low-voltage battery does not, the high-voltage battery can recharge the first low-voltage battery through the second power conversion circuit. This can provide a new recharge path for the first low-voltage battery when the first power conversion circuit fails, thereby improving the recharge efficiency of the first low-voltage battery.

[0238] In scenario two, if the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to the second threshold (indicating that the first low-voltage battery needs to be recharged), and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold (indicating that the second low-voltage battery needs to be recharged), the recharge control device controls the second power conversion circuit to be in the output state and the switching unit to be in the conducting state.

[0239] The second power conversion circuit converts the first DC power output from the high-voltage battery into a third DC power. This third DC power is used to replenish the first and second low-voltage batteries. The voltage of the third DC power is the larger of the charging voltages of the first and second low-voltage batteries. The charging voltages of the first and second low-voltage batteries can be pre-calculated. The calculation method for the charging voltages of the first and second low-voltage batteries can be found in the above embodiment. After obtaining the charging voltages of the first and second low-voltage batteries, the electronic control device controls the output voltage of the second power conversion circuit (the voltage of the third DC power) so that the output voltage of the second power conversion circuit is equal to the larger of the charging voltages of the first and second low-voltage batteries. This prevents the low-voltage battery with the larger charging voltage from recharging the low-voltage battery with the smaller charging voltage, thus ensuring the replenishment effect of the low-voltage battery with the larger charging voltage.

[0240] In this embodiment, the descriptions of the second and third thresholds can be found in Case 1 above, and will not be repeated here. When the second power conversion circuit is in the output state, it indicates that the second power conversion circuit is working.

[0241] Please see Figure 13 , Figure 13 This is a schematic diagram illustrating a power replenishment method provided in an embodiment of this application when a first power conversion circuit fails and both low-voltage batteries require additional power. The second threshold is 100%, and the third threshold is 100%. Figure 13 As shown, the remaining charge of the first low-voltage battery is 70%, which is less than or equal to the second threshold. The remaining charge of the second low-voltage battery is 70%, which is less than or equal to the third threshold. At this time, both the first and second low-voltage batteries need to be recharged. The recharge control device controls the second power conversion circuit to be in the output state, and the switching unit to be in the conducting state. The recharge path for the first low-voltage battery (e.g.) Figure 13 The charging path A shown is: high-voltage battery → second power conversion circuit → switching unit → first low-voltage battery. The charging path for the second low-voltage battery (as shown) is... Figure 13 The power replenishment path B shown is: high-voltage battery → second power conversion circuit → second low-voltage battery. In this embodiment, when the first power conversion circuit fails and both the first low-voltage battery and the second low-voltage battery need to be recharged, the high-voltage battery can simultaneously recharge the first and second low-voltage batteries through the second power conversion circuit. This provides a new recharge path for the first low-voltage battery when the first power conversion circuit fails, thereby improving the recharge efficiency of the first and second low-voltage batteries.

[0242] In scenario three, if the remaining power indicated by the remaining power information of the first low-voltage battery is greater than or equal to the second threshold, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to the third threshold, the power replenishment control device controls the second power conversion circuit to be in the output state and the switching unit to be in the on or off state.

[0243] The second power conversion circuit converts the first DC power output from the high-voltage battery into a third DC power. This third DC power is used to charge the second low-voltage battery, and its voltage is the charging voltage of the second low-voltage battery. The charging voltage of the second low-voltage battery can be calculated in advance. The calculation method for the charging voltage of the second low-voltage battery can be found in the above embodiment. After obtaining the charging voltage of the second low-voltage battery, the electrical control device controls the output voltage of the second power conversion circuit (the voltage of the third DC power) so that the output voltage of the second power conversion circuit is equal to the charging voltage of the second low-voltage battery.

[0244] In this embodiment, the descriptions of the second and third thresholds can be found in Case 1 above, and will not be repeated here. When the second power conversion circuit is in the output state, it indicates that the second power conversion circuit is working.

[0245] Please see Figure 14 , Figure 14 This is a schematic diagram illustrating another power replenishment method provided in an embodiment of this application when a first power conversion circuit fails and a low-voltage battery needs additional power. The second threshold is 100%, and the third threshold is 100%. Figure 14 As shown, the remaining charge of the first low-voltage battery is 100%, which is greater than or equal to the second threshold. The remaining charge of the second low-voltage battery is 70%, which is less than or equal to the third threshold. At this time, the first low-voltage battery does not need to be recharged, but the second low-voltage battery does. The recharge control device controls the second power conversion circuit to be in the output state, and the switching unit to be in the on or off state. The recharge path of the second low-voltage battery (e.g.) Figure 14 The thick line shown represents: high-voltage battery → second power conversion circuit → second low-voltage battery. In this embodiment of the application, when the first power conversion circuit fails and the second low-voltage battery needs to be recharged, the high-voltage battery can recharge the second low-voltage battery through the second power conversion circuit, thereby improving the recharging efficiency of the second low-voltage battery when the first power conversion circuit fails.

[0246] In one possible implementation, the first power conversion circuit is determined to be faulty if any of the following conditions are met: 1) The power supply control device detects the fault information reported by the first power conversion circuit, and the fault persists for more than a first duration; 2) The power supply control device detects that the output power of the first power conversion circuit is less than or equal to the first threshold mentioned above, and continues for a second duration; 3) The power supply control device detects that the output voltage of the first power conversion circuit is less than or equal to the set voltage, and continues for a third duration; 4) When the power supply control device detects that the first power conversion circuit is in the output state, the switch is in the open state, and the switch remains in the open state for more than four hours.

[0247] The first, second, third, and fourth durations can be preset durations. The set voltage can be the lower limit of the voltage range that the first power conversion circuit can output under normal conditions. For example, the first duration can be 5 seconds, the second duration can be 15 seconds, the third duration can be 15 seconds, the fourth duration can be 5 seconds, and the set voltage can be 12V.

[0248] The embodiments of this application can determine whether the first power conversion circuit has malfunctioned based on at least one of the fault information reported by the first power conversion circuit, the output power of the first power conversion circuit, the output voltage of the first power conversion circuit, and the state of the switch in the first power conversion circuit when the first power conversion circuit is in the output state. This can accurately determine whether the first power conversion circuit has malfunctioned.

[0249] In one possible implementation, when the power supply control system is in a first operating mode, a first low-voltage battery is used to power a first load; or, a second low-voltage battery is used to power the first load.

[0250] When the power supply control system is in the second operating mode, the first low-voltage battery is used to power the second load, and the second low-voltage battery is used to power the third load; the first load includes the second load and the third load, and the energy consumption of the first operating mode is less than or equal to the energy consumption of the second operating mode.

[0251] In this embodiment, the first operating mode can be a non-driving mode for the vehicle. The second operating mode can be a driving mode for the vehicle. Considering the difference in load power supply strategies when the vehicle is in the first or second operating mode: In the first operating mode (e.g., the vehicle is in a sleep state), the power consumption of the first load is low. Only one power conversion circuit needs to be activated to charge one low-voltage battery, allowing the other power conversion circuit and the other low-voltage battery to sleep or stop working, thus extending the lifespan of the other power conversion circuit and the other low-voltage battery. In the second operating mode, the first low-voltage battery is used to power the second load, and the second low-voltage battery is used to power the third load. The two low-voltage batteries supply power to different low-voltage loads, thereby keeping the lifespan of the first and second low-voltage batteries as consistent as possible. The charging strategy in the second operating mode can be found above. Figures 6 to 11 The example shown.

[0252] In one possible example, the first low-voltage battery is the primary low-voltage battery, and the second low-voltage battery is the secondary low-voltage battery.

[0253] In another possible example, the second low-voltage battery is the auxiliary low-voltage battery, and the first low-voltage battery is the main low-voltage battery.

[0254] Of the first and second low-voltage batteries, one is the primary low-voltage battery, and the other is the secondary low-voltage battery. In driving conditions (e.g., when the vehicle is in motion), the primary low-voltage battery is given priority for both charging and discharging. In non-driving conditions (e.g., when the vehicle is in sleep mode), the secondary low-voltage battery is given priority for both charging and discharging.

[0255] Please see Figure 15 , Figure 15This diagram illustrates a power supply strategy and a power replenishment strategy under different driving conditions, as provided in an embodiment of this application. Figure 15 As shown, if the first low-voltage battery is the primary low-voltage battery and the second low-voltage battery is the secondary low-voltage battery, then the power supply strategy during vehicle operation is as follows: the first and second low-voltage batteries supply power to the first load. The charging strategy during vehicle operation is as follows: if under low load, the first power conversion circuit prioritizes charging; if under high load, both the first and second power conversion circuits charge simultaneously. The power supply strategy during non-vehicle operation is as follows: the second low-voltage battery is used preferentially to supply power, allowing the first low-voltage battery to maintain a higher remaining charge. The charging strategy during non-vehicle operation is as follows: the second power conversion circuit prioritizes charging.

[0256] The foregoing has described the application scenarios and methods provided by the embodiments of this application. The following provides the apparatus of the embodiments of this application. It is understood that the various apparatuses provided in the embodiments of this application, such as charging control devices, vehicles, etc., include hardware structures, software units, or combinations of hardware and software structures to perform the functions described in the above method embodiments. Those skilled in the art should readily recognize that the apparatus and its modules can be implemented in hardware or a combination of hardware and computer software in conjunction with the various functions described in the embodiments disclosed herein. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different apparatus implementations in different application scenarios to implement the aforementioned method embodiments, and different implementations of the apparatus should not be considered beyond the scope of the embodiments of this application.

[0257] Please see Figure 16 , Figure 16 This is a schematic diagram of a power supply control device provided in an embodiment of this application. Figure 16 As shown, the power replenishment control device 160 may include a communication unit 1601 and a processing unit 1602. The communication unit 1601 and the processing unit 1602 may be software, hardware, or a combination of software and hardware.

[0258] The communication unit 1601 can implement sending and / or receiving functions, and can also be described as a transceiver unit. The communication unit 1601 can also be a unit integrating an acquisition unit and a sending unit, wherein the acquisition unit is used to implement the receiving function, and the sending unit is used to implement the sending function. Optionally, the communication unit 1601 can be used to receive information sent by other devices, and can also be used to send information to other devices.

[0259] In one possible design, the power replenishment control device 160 may correspond to the above. Figure 6 or Figure 11 The power-compensation control device in the illustrated method embodiment, such as power-compensation control device 160, can be an electronic device or a chip within an electronic device. The power-compensation control device 160 may include components for performing the above-described... Figure 6 or Figure 11 The unit in the method embodiment shown is the one whose operation is performed by the power supply control device, and each unit in the power supply control device 160 is respectively for implementing the above-mentioned... Figure 6 or Figure 11 The operation performed by the power supply control device in the illustrated method embodiment is described below: The communication unit 1601 is used to acquire the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load.

[0260] The processing unit 1602 is used to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The power replenishment strategy is used to control the state of the power conversion device connected between the high-voltage battery and the first low-voltage battery and the second low-voltage battery, so that the high-voltage battery replenishes the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0261] The execution steps of the communication unit 1601 and processing unit 1602 in this design can be referred to the steps described above. Figure 6 or Figure 11 The implementation method shown corresponds to the power supply control device in the method embodiment.

[0262] Regarding the technical effects of the implementation methods performed by the communication unit 1601 and the processing unit 1602 of this design, please refer to the description above. Figure 6 or Figure 11 The technical effects of the illustrated method embodiments are described below.

[0263] exist Figure 16 In the described power replenishment control device 160, a power replenishment strategy can be determined based on the load demand of the first load, the remaining power of the first low-voltage battery, and the remaining power of the second low-voltage battery. The power replenishment strategy takes into account the influence of the load demand of the first load, thereby improving the power replenishment efficiency of the first low-voltage battery and the second low-voltage battery.

[0264] For cases where the aforementioned power supply control device 160 can be an electronic device, please refer to [reference needed]. Figure 17 The diagram shows the structure of the electronic device.

[0265] It should be understood that Figure 17The illustrated electronic device 170 is merely an example; the electronic device in this application embodiment may also include other components, or include components related to... Figure 17 Components with similar functions, or not necessarily including Figure 17 All components.

[0266] Electronic device 170 includes a transceiver interface 1701 and at least one processor 1702.

[0267] The electronic device 170 can correspond to a power supply control device. The transceiver interface 1701 is used for transmitting and receiving signals, and at least one processor 1702 executes program instructions, causing the electronic device 170 to implement the corresponding process of the method executed by the corresponding device in the above method embodiment.

[0268] In one possible design, the electronic device 170 may correspond to the above. Figure 6 or Figure 11 The power-compensation control device in the illustrated method embodiment, such as the electronic device 170, can be a power-compensation control device or a chip within it. The electronic device 170 may include components for performing the operations executed by the power-compensation control device in the above method embodiment, and each component in the electronic device 170 is specifically designed to implement the operations executed by the power-compensation control device in the above method embodiment. Specifically, it can be as follows: The transceiver interface 1701 is used to acquire the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load.

[0269] The processor 1702 is used to determine a power replenishment strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery, and the remaining power information of the second low-voltage battery. The power replenishment strategy is used to control the state of the power conversion device connected between the high-voltage battery and the first low-voltage battery and the second low-voltage battery, so that the high-voltage battery replenishes the first low-voltage battery and / or the second low-voltage battery through the power conversion device.

[0270] Regarding the transceiver interface 1701 and at least one processor 1702 of this design, the execution steps can be referred to the corresponding steps described above. Figure 6 or Figure 11 The implementation method shown corresponds to the power supply control device in the method embodiment.

[0271] Regarding the technical effects of the transceiver interface 1701 and the implementation methods executed by at least one processor 1702 in this design, please refer to the description above. Figure 6 or Figure 11 The technical effects of the illustrated method embodiments are described below.

[0272] exist Figure 17 In the described electronic device 170, a power replenishment strategy can be determined based on the load demand of the first load, the remaining power of the first low-voltage battery, and the remaining power of the second low-voltage battery. The power replenishment strategy takes into account the influence of the load demand of the first load, thereby improving the power replenishment efficiency of the first low-voltage battery and the second low-voltage battery.

[0273] For cases where the aforementioned power supply control device 160 can be a chip or a chip system, please refer to [reference needed]. Figure 18 The diagram shows the structure of the chip.

[0274] like Figure 18 As shown, chip 180 includes processor 1801 and interface 1802. The number of processors 1801 can be one or more, and the number of interfaces 1802 can be multiple. It should be noted that the functions of processor 1801 and interface 1802 can be implemented through hardware design, software design, or a combination of both; no restrictions are placed here.

[0275] Optionally, chip 180 may also include memory 1803 for storing necessary program instructions and data.

[0276] In one possible design, processor 1801 may be used to call the implementation program of the power-compensation control method provided in one or more embodiments of this application in the power-compensation control device from memory 1803, and execute the instructions included in the program.

[0277] Interface 1802 can be used to output the execution results of processor 1801. In this application, interface 1802 can specifically be used to output various messages or information from processor 1801.

[0278] For the power replenishment control method provided in one or more embodiments of this application, please refer to the foregoing. Figure 6 or Figure 11 The various embodiments shown are not described in detail here.

[0279] The processor in this embodiment can be a central processing unit (CPU), or it can be other general-purpose processors. A general-purpose processor can be a microprocessor or any conventional processor.

[0280] The memory in this application embodiment is used to provide storage space, in which data such as operating system and computer programs can be stored. The memory includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or compact disc read-only memory (CD-ROM).

[0281] According to the method provided in the embodiments of this application, the embodiments of this application also provide a computer-readable storage medium storing a computer program. When the computer program is run on one or more processors, it can implement the above-mentioned... Figure 6 or Figure 11 The method shown.

[0282] According to the method provided in the embodiments of this application, the embodiments of this application also provide a computer program product, which includes a computer program. When the computer program runs on a processor, it can achieve the above-mentioned... Figure 6 or Figure 11 The method shown.

[0283] This application also provides a vehicle that includes at least one power replenishment control device 160, or electronic device 170, or chip 180.

[0284] Optionally, the vehicle may include commercial vehicles, passenger vehicles, industrial vehicles (such as forklifts, trailers, and tractors), and engineering vehicles (such as excavators, bulldozers, and cranes), etc., and this application embodiment does not limit this. The vehicle may be any of the following: electric vehicles, hybrid vehicles, and gasoline vehicles.

[0285] Optionally, the vehicle is used to achieve the above. Figure 6 or Figure 11 The method shown.

[0286] Optionally, the above Figure 6 or Figure 11 The method shown can be implemented as an executable file within the vehicle operating system (VOS).

[0287] This application also provides a power replenishment control device, including a processor and an interface. The processor is used to execute the methods in any of the above method embodiments.

[0288] It should be understood that the above-described processing device can be a chip. The units in the various device embodiments and the electronic devices in the method embodiments correspond completely, with corresponding modules or units executing corresponding steps. For example, the communication unit (transceiver) executes the receiving or sending steps in the method embodiments, while other steps besides sending and receiving can be executed by the processing unit (processor). The specific functions of each unit can be found in the corresponding method embodiments. There can be one or more processors.

[0289] It is understood that in the embodiments of this application, the electronic device may perform some or all of the steps in the embodiments of this application. These steps or operations are merely examples, and the embodiments of this application may also perform other operations or variations thereof. Furthermore, the steps may be performed in different orders as presented in the embodiments of this application, and it is not necessarily necessary to perform all the operations in the embodiments of this application.

[0290] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0291] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0292] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0293] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the contributing part, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0294] In addition, a few additional points need to be made regarding this application: (1) The terms “first” and “second” in the specification, claims and drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0295] (2) In the embodiments of this application, “connection” refers to electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, the connection between A and B can also be a direct connection between A and C, a direct connection between C and B, or a connection between A and B through C.

[0296] (3) The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that in the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology and / or descriptions between the various embodiments are consistent and can be mutually referenced, and the technical features of different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0297] (4) In this application, "at least one (item)" means one or more, "more than" means two or more, "at least two (items)" means two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single (items) or plural (items). For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0298] (5) In this application, “instruction” may include direct instruction, indirect instruction, explicit instruction, and implicit instruction. When a certain instruction information is used to indicate A, it can be understood that the instruction information carries A, directly indicates A, or indirectly indicates A.

[0299] (6) In this application, the information indicated by the instruction information is called the information to be instructed. In the specific implementation process, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or the index of the information to be instructed. It is also possible to indirectly indicate the information to be instructed by indicating other information, wherein there is an association between the other information and the information to be instructed. It is also possible to indicate only a part of the information to be instructed, while the other parts of the information to be instructed are known or agreed in advance. For example, the instruction of specific information can also be achieved by using the arrangement order of various information agreed in advance (e.g., stipulated by the protocol), thereby reducing the instruction overhead to a certain extent. The information to be instructed can be sent as a whole, or it can be divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and / or sending time of these sub-information can be predefined, such as predefined according to the protocol, or configured by the transmitting end device by sending configuration information to the receiving end device.

[0300] (7) In this application, “send” can be understood as “output” and “receive” can be understood as “input”. “Send information to A”, where “to A” only indicates the direction of information transmission, and A is the destination. It does not restrict “send information to A” to be a direct transmission over the air interface. “Send information to A” includes sending information directly to A, as well as sending information indirectly to A through a transmitter. Therefore, “send information to A” can also be understood as “outputting information destined for A”. Similarly, “receive information from A” indicates that the source of the information is A. This includes receiving information directly from A, as well as receiving information indirectly from A through a receiver. Therefore, “receive information from A” can also be understood as “inputting information from A”.

[0301] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A power make-up control method, characterized by, The power supplement control method comprises: obtaining load demand of a first load, remaining power information of a first low-voltage battery and remaining power information of a second low-voltage battery; the first low-voltage battery and / or the second low-voltage battery are used to supply power to the first load; determining a power supplement strategy based on the load demand of the first load, the remaining power information of the first low-voltage battery and the remaining power information of the second low-voltage battery; the power supplement strategy is used to control the state of an electric energy conversion device connected between a high-voltage battery and the first low-voltage battery and the second low-voltage battery, so that the high-voltage battery supplements power to the first low-voltage battery and / or the second low-voltage battery through the electric energy conversion device.

2. The method of claim 1, wherein, The electric energy conversion device comprises a first power conversion circuit, a second power conversion circuit and a switching unit; The first power conversion circuit is used to convert first direct current output by the high-voltage battery into second direct current, so that the second direct current supplements power to the first low-voltage battery and / or the second low-voltage battery; the voltage of the first direct current is greater than or equal to the voltage of the second direct current; The second power conversion circuit is used to convert the first direct current output by the high-voltage battery into third direct current, so that the third direct current supplements power to the first low-voltage battery and / or the second low-voltage battery; the voltage of the first direct current is greater than or equal to the voltage of the third direct current; The switching unit is used to control the connection or disconnection of the first power conversion circuit and the second low-voltage battery, and / or to control the connection or disconnection of the second power conversion circuit and the first low-voltage battery.

3. The method of claim 2, wherein, The determination of the power supplement strategy comprises: in the case where the load power indicated by the load demand of the first load is less than or equal to a first threshold value, the first power conversion circuit is controlled to be in an output state, and the second power conversion circuit is controlled to be in a disconnected state; wherein the switching unit is controlled to be in a conducting state or a disconnected state.

4. The method of claim 2, wherein, The determination of the power supplement strategy comprises: in the case where the load power indicated by the load demand of the first load is greater than or equal to a first threshold value, the first power conversion circuit is controlled to be in an output state, and the second power conversion circuit is controlled to be in an output state; wherein the switching unit is controlled to be in a conducting state or a disconnected state.

5. The method of claim 3, wherein, The determination of the power supplement strategy further comprises: in the case where the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold value, and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to a third threshold value, the voltage of the second direct current output by the first power conversion circuit is controlled to be the charging voltage of the first low-voltage battery.

6. The method of claim 3, wherein, The determination of the power supplement strategy further comprises: in the case where the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold value, and the remaining power indicated by the remaining power information of the second low-voltage battery is less than or equal to a third threshold value, the switching unit is controlled to be in a conducting state; The second direct current output by the first power conversion circuit is used to charge the first low-voltage battery and the second low-voltage battery, and the voltage of the second direct current is the greater one of the charging voltage of the first low-voltage battery and the charging voltage of the second low-voltage battery.

7. The method of claim 4, wherein, The determining the charging strategy further comprises: controlling the switch unit to be in the conducting state when the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold value and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to a third threshold value; The second direct current output by the first power conversion circuit is used to charge the first low-voltage battery, and the third direct current output by the second power conversion circuit is used to charge the second low-voltage battery, and the voltage of the second direct current is the charging voltage of the first low-voltage battery, and the voltage of the third direct current is the charging voltage of the second low-voltage battery.

8. The method of claim 4, wherein, The determining the charging strategy further comprises: controlling the switch unit to be in the conducting state when the remaining power indicated by the remaining power information of the first low-voltage battery is less than or equal to a second threshold value and the remaining power indicated by the remaining power information of the second low-voltage battery is greater than or equal to a third threshold value; The second direct current output by the first power conversion circuit is used to charge the first low-voltage battery, and the third direct current output by the second power conversion circuit is used to charge the second low-voltage battery, and the voltage of the second direct current is the charging voltage of the first low-voltage battery, and the voltage of the third direct current is the charging voltage of the second low-voltage battery.

9. The method according to any one of claims 5 to 8, characterized in that, The electric energy conversion device is applied to a vehicle. The charging voltage of the first low-voltage battery is determined based on an upper limit value of the charging voltage of the first low-voltage battery, a lower limit value of the power consumption voltage of the vehicle, and a required charging voltage of the first low-voltage battery.

10. The method according to any one of claims 5 to 8, characterized in that, The electric energy conversion device is applied to a vehicle. The charging voltage of the first low-voltage battery is the maximum one of the upper limit value of the charging voltage of the first low-voltage battery and the lower limit value of the power consumption voltage of the vehicle.

11. The method of claim 9, wherein, when the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the lower limit value of the power consumption voltage of the vehicle is the minimum one of the upper limit value of the charging voltage of the first low-voltage battery, the lower limit value of the power consumption voltage of the vehicle, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the required charging voltage of the first low-voltage battery; or, when the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the lower limit value of the power consumption voltage of the vehicle is the minimum one of the upper limit value of the charging voltage of the first low-voltage battery, the lower limit value of the power consumption voltage of the vehicle, and the required charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the required charging voltage of the first low-voltage battery; or, In a case where the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the required charging voltage of the first low-voltage battery is greater than or equal to the upper limit value of the charging voltage of the first low-voltage battery, the charging voltage of the first low-voltage battery is the maximum value of the upper limit value of the charging voltage of the first low-voltage battery and the lower limit value of the power supply voltage of the vehicle. Or, In a case where the load power indicated by the load demand of the first load is greater than or equal to the third threshold value, the charging voltage of the first low-voltage battery is the maximum value of the upper limit value of the charging voltage of the first low-voltage battery, the lower limit value of the power supply voltage of the vehicle, and the required charging voltage of the first low-voltage battery.

12. The method according to any one of claims 5 to 8, characterized in that, The electric energy conversion device is applied to a vehicle. The charging voltage of the second low-voltage battery is determined based on the upper limit value of the charging voltage of the second low-voltage battery, the lower limit value of the power supply voltage of the vehicle, and the required charging voltage of the second low-voltage battery.

13. The method according to any one of claims 5 to 8, characterized in that, The electric energy conversion device is applied to a vehicle. The charging voltage of the second low-voltage battery is the maximum value of the upper limit value of the charging voltage of the second low-voltage battery and the lower limit value of the power supply voltage of the vehicle.

14. The method of claim 12, wherein, In a case where the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the required charging voltage of the second low-voltage battery is the minimum value of the upper limit value of the charging voltage of the second low-voltage battery, the lower limit value of the power supply voltage of the vehicle, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the lower limit value of the power supply voltage of the vehicle. Or, In a case where the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the lower limit value of the power supply voltage of the vehicle is the minimum value of the upper limit value of the charging voltage of the second low-voltage battery, the lower limit value of the power supply voltage of the vehicle, and the required charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the required charging voltage of the second low-voltage battery. Or, In a case where the load power indicated by the load demand of the first load is less than or equal to the first threshold value, and the required charging voltage of the second low-voltage battery is greater than or equal to the upper limit value of the charging voltage of the second low-voltage battery, the charging voltage of the second low-voltage battery is the maximum value of the upper limit value of the charging voltage of the second low-voltage battery and the lower limit value of the power supply voltage of the vehicle. Or, In a case where the load power indicated by the load demand of the first load is greater than or equal to the first threshold value, the charging voltage of the second low-voltage battery is the maximum value of the upper limit value of the charging voltage of the second low-voltage battery, the lower limit value of the power supply voltage of the vehicle, and the required charging voltage of the second low-voltage battery.

15. The method of any one of claims 1 to 14, wherein, In a case where the electric energy conversion device is in the first working mode, the first low-voltage battery is used to supply power to the first load, or the second low-voltage battery is used to supply power to the first load. In a case where the electric energy conversion device is in a second working mode, the first low-voltage battery is configured to supply power to a second load, and the second low-voltage battery is configured to supply power to a third load; the first load comprises the second load and the third load, and energy consumption of the first working mode is less than or equal to energy consumption of the second working mode.

16. A power make-up control system characterized by, The power supplementing control system comprises a high-voltage battery, a first low-voltage battery, a second low-voltage battery, an electric energy conversion device, and a power supplementing control device; the high-voltage battery is connected to the first low-voltage battery and the second low-voltage battery through the electric energy conversion device; The power supplementing control device is configured to acquire load demand of a first load, residual power information of the first low-voltage battery, and residual power information of the second low-voltage battery; the first low-voltage battery and / or the second low-voltage battery is configured to supply power to the first load; The power supplementing control device is further configured to determine a power supplementing strategy based on the load demand of the first load, the residual power information of the first low-voltage battery, and the residual power information of the second low-voltage battery; the power supplementing strategy is configured to control a state of the electric energy conversion device, so that the high-voltage battery supplements power to the first low-voltage battery and / or the second low-voltage battery through the electric energy conversion device.

17. A power make-up control device characterized by comprising: characterized in that comprising means for carrying out the method according to any one of claims 1 to 15.

18. A power make-up control device characterized by comprising: comprising a processor configured to carry out the method according to any one of claims 1 to 15.

19. A chip, characterized by The chip comprises a logic circuit and an interface, and the logic circuit and the interface are coupled; The interface is configured to input and / or output information, and the logic circuit is configured to carry out the method according to any one of claims 1 to 15.

20. A computer-readable storage medium, characterized in that, The computer readable storage medium is configured to store a computer program, and the computer program is configured to be executed to carry out the method according to any one of claims 1 to 15.

21. A computer program product, characterised in that, The computer program product comprises a computer program, and the computer program is configured to be executed to carry out the method according to any one of claims 1 to 15.

22. A vehicle characterized by comprising the power supplementing control system according to claim 16, or the power supplementing control device according to claim 17, or the power supplementing control device according to claim 18, or the chip according to claim 19.

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