Energy management method and device for power battery and vehicle

Abstract

The application provides a power battery energy management method and device and a vehicle. The method comprises the following steps: acquiring the maximum available power of a battery pack corresponding to the residual power of the battery pack; determining the power level of the residual power of the battery pack according to the relationship between the residual power of the battery pack and a preset power threshold; determining the power distribution priority of the power load according to the power level; and providing the required power for the power load with a power request according to the power distribution priority and the maximum available power in response to the power request of the power load. The application divides the power distribution priority of the power load at different power levels, provides the required power for the power load with a power request according to the power distribution priority and the maximum available power when the power load has a power request, and reasonably distributes the maximum available power of the battery pack, so that the corresponding cruising range is increased, and the vehicle comfort and energy utilization are improved.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and in particular to a method and apparatus for energy management of a power battery and a vehicle. Background Technology

[0002] The vehicle's control system mainly consists of a battery pack system, a high-low voltage conversion system, a power supply, a drive motor, and an air conditioning system. The battery pack system is the energy source for the entire vehicle, and the vehicle should possess the same performance, economy, comfort, and braking performance as traditional gasoline vehicles. Properly distributing the battery pack's charge can optimize the vehicle's performance, economy, and comfort.

[0003] Currently, the vehicle's power and energy distribution are mainly based on the power demand of each electrical load. If the drive motor has a power demand, the vehicle controller will release the corresponding power to the drive motor; if the air conditioning system has a power demand, the vehicle controller will release the corresponding power to the air conditioning system.

[0004] However, if the above control strategy is used to supply power to electrical loads without properly distributing the vehicle's power, and the power of the battery pack voltage is low, the power of all electrical loads will be limited to a certain extent. The performance of each electrical load cannot be fully utilized, and the vehicle's power, economy, and comfort cannot be guaranteed. This can easily lead to a significant reduction in the vehicle's driving range, thereby affecting the user experience. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] Therefore, one objective of this invention is to propose an energy management method for a power battery. This method determines the power allocation priority of electrical loads at different power levels. When an electrical load requests power, it provides the required power to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization.

[0007] Therefore, a second objective of the present invention is to provide an energy management device for a power battery.

[0008] Therefore, a third objective of the present invention is to provide a vehicle.

[0009] To achieve the above objectives, an embodiment of the first aspect of the present invention provides an energy management method for a power battery, the method comprising: obtaining the maximum available power of the battery pack corresponding to the remaining power of the battery pack; determining the power level of the remaining power of the battery pack based on the relationship between the remaining power of the battery pack and a preset power threshold; determining the power allocation priority of an electrical load based on the power level; and responding to the power request of the electrical load by providing the required power to the electrical load with the power request based on the power allocation priority and the maximum available power.

[0010] According to the energy management method of the power battery of the present invention, the relationship between the remaining power of the battery pack and the preset power threshold is determined to determine the power level of the remaining power of the battery pack, and the power allocation priority of the electrical load is determined according to the power level. By dividing the power allocation priority of the electrical load at different power levels, when the electrical load requests power, the required power is provided to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization rate.

[0011] In some embodiments, determining the power level of the remaining power of the battery pack based on the relationship between the remaining power of the battery pack and a preset power threshold includes: if the remaining power of the battery pack is greater than the preset power threshold, determining the remaining power of the battery pack to be at a high power level; if the remaining power of the battery pack is less than or equal to the preset power threshold, determining the remaining power of the battery pack to be at a low power level.

[0012] In some embodiments, determining the power allocation priority of electrical loads based on the power level includes: when the power level is a high power level, the power allocation priority of the electrical loads from high to low includes: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device.

[0013] In some embodiments, responding to a power request from the electrical load, providing the required power to the electrical load with the power request according to the power allocation priority and the maximum available power includes: when responding to a power request from one of the DC / DC converter, the battery pack emergency cooling device, the defogging device, the defrosting device, the cabin cooling device, the cabin heating device, the power system cooling device, and the power system heating device, determining the required power of the electrical load, and providing the required power to the electrical load using the maximum available power when the maximum available power meets the required power of the electrical load; when responding to a power request from the DC / DC converter... When multiple power requests are made from the battery pack emergency cooling device, the defogging device, the defrosting device, the cabin cooling device, the cabin heating device, the power system cooling device, and the power system heating device, the power allocation priority of the multiple electrical loads is determined. According to the power allocation priority, the corresponding required power is provided to the current priority electrical load based on the maximum available power. The remaining power after the maximum available power meets the required power of the current priority electrical load is calculated. When the remaining power meets the required power of the next priority electrical load of the current priority electrical load, the remaining power is used to provide the required power to the next priority electrical load.

[0014] In some embodiments, the energy management method for the power battery further includes: when responding to a power request from the second driving device, determining the power allocation priority of the second driving device and the driving mode of the vehicle; providing the second driving device with a preset required power according to the power allocation priority of the second driving device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes a sport mode, a normal mode or an economy mode.

[0015] In some embodiments, determining the power allocation priority of the electrical load based on the power level includes: when the power level is low, determining the power allocation priority of the electrical load from high to low as follows: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device and defrosting device.

[0016] In some embodiments, responding to a power request from an electrical load and providing the required power to the electrical load with the power request according to the power allocation priority and the maximum available power includes: when responding to a power request from one of the DC / DC converter, the battery pack emergency cooling device, the defogging device, and the defrosting device, determining the required power of the electrical load, and providing the required power to the electrical load using the maximum available power when the maximum available power meets the required power of the electrical load; when responding to multiple power requests from the DC / DC converter, the battery pack emergency cooling device, the defogging device, and the defrosting device, determining the power allocation priority of multiple electrical loads, providing the corresponding required power to the current priority electrical load according to the power allocation priority and based on the maximum available power, calculating the remaining power after the maximum available power meets the required power of the current priority electrical load, and providing the required power to the next priority electrical load using the remaining power when the remaining power meets the required power of the next priority electrical load of the current priority electrical load.

[0017] In some embodiments, the energy management method for the power battery further includes: when responding to a power request from the first driving device, determining the power allocation priority of the first driving device and the driving mode of the vehicle; providing the first driving device with a preset required power according to the power allocation priority of the first driving device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes a sport mode, a normal mode or an economy mode.

[0018] To achieve the above objectives, a second aspect of the present invention provides an energy management device for a power battery. The device includes an acquisition module for acquiring the maximum available power of the battery pack corresponding to the remaining battery charge; a first determination module for determining the charge level of the remaining battery charge based on a relationship between the remaining battery charge and a preset charge threshold; a second determination module for determining the power allocation priority of an electrical load based on the charge level; and a response module for responding to a power request from the electrical load and providing the requested power to the electrical load based on the power allocation priority and the maximum available power.

[0019] According to an embodiment of the present invention, the power battery energy management device determines the energy level of the remaining energy of the battery pack by determining the relationship between the remaining energy of the battery pack and a preset energy threshold, and determines the power allocation priority of the electrical load according to the energy level. By dividing the power allocation priority of the electrical load at different energy levels, when the electrical load requests power, the device provides the required power to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization rate.

[0020] To achieve the above objectives, a third aspect of the present invention provides a vehicle comprising: an energy management device for the power battery described above.

[0021] According to the vehicle of the present invention, by determining the relationship between the remaining battery charge and a preset charge threshold, the charge level of the remaining battery charge is determined, and the power allocation priority of the electrical load is determined according to the charge level. By dividing the power allocation priority of the electrical load at different charge levels, when the electrical load requests power, the required power is provided to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a flowchart of a power battery energy management method according to an embodiment of the present invention;

[0025] Figure 2 This is a block diagram of an energy management device for a power battery according to an embodiment of the present invention;

[0026] Figure 3 This is a block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0028] Energy management of a power battery involves determining the power allocation priority for each electrical load at different charge levels based on the battery's current available discharge power—that is, the maximum available power corresponding to the remaining charge in the battery pack. It then responds to the power requests of these loads, providing the required power based on the power allocation priority and the maximum available power. This achieves a rational allocation of the maximum available power, improving the vehicle's performance, fuel economy, and comfort.

[0029] The following is combined Figure 1 The energy management method for a power battery according to embodiments of the present invention is described, such as... Figure 1 As shown, the energy management method for a power battery according to an embodiment of the present invention includes at least steps S1-S4.

[0030] Step S1: Obtain the maximum available power of the battery pack corresponding to the remaining battery power.

[0031] The remaining power of the battery pack corresponds to its maximum available power. The remaining power of the battery pack can represent the maximum available power that the battery pack can provide to the electrical load. Different remaining power levels correspond to different maximum available power levels. For example, a higher remaining power level corresponds to a higher maximum available power level, and a lower remaining power level corresponds to a lower maximum available power level.

[0032] In this embodiment, the remaining power of the battery pack is obtained to determine the maximum available power of the battery pack corresponding to the remaining power. Based on the maximum available power of the battery pack and the power demand of each electrical load, the required power is provided to each electrical load.

[0033] Step S2: Determine the battery pack's remaining power level based on the relationship between the remaining battery pack power and the preset power threshold.

[0034] The preset power threshold is a pre-defined power value for the battery pack. By setting the preset power threshold, the remaining power of the battery pack can be distinguished to determine whether the remaining power of the battery pack is at a high power level or a low power level.

[0035] In this embodiment, after determining the remaining power of the battery pack, the remaining power of the battery pack is compared with a preset power threshold to determine the power level of the remaining power of the battery pack, and then the power allocation priority of the electrical load at the corresponding power level is determined based on the power level of the remaining power of the battery pack.

[0036] Step S3: Determine the power allocation priority of the electrical load based on the power level.

[0037] In this embodiment, the remaining battery charge level is related to the power allocation priority of the electrical loads; different remaining battery charge levels result in different power allocation priorities for the electrical loads. By determining the remaining battery charge level, the power allocation priority of the electrical loads is determined, facilitating the rational allocation of maximum available power based on these priorities. It is understood that the power allocation priority of the electrical loads is pre-defined based on the urgency of their power demands during vehicle use.

[0038] Step S4: Respond to the power request of the electrical load and provide the required power to the electrical load with the power request according to the power allocation priority and the maximum available power.

[0039] In this embodiment, after determining the energy level of the electrical load, a power allocation priority for the electrical load is determined based on the energy level. For example, when the battery pack has a high remaining energy level, the power allocation priority for the electrical load at that high energy level is determined, and upon receiving a power request from the electrical load, the power request is responded to, and the required power is provided to the electrical load based on the maximum available power at that energy level. When the electrical load is at a low energy level, the power allocation priority for the electrical load at that low energy level is determined, and upon receiving a power request from the electrical load, the power request is responded to, and the required power is provided to the electrical load based on the maximum available power at that energy level. It can be understood that by classifying the remaining energy level of the battery pack, determining the power allocation priority of the electrical load at the corresponding energy level, and providing the required power to the electrical load based on the power allocation priority and the maximum available power according to the power request of the electrical load, the maximum available power of the battery pack is rationally allocated, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization efficiency.

[0040] According to the energy management method of the power battery of the present invention, the relationship between the remaining power of the battery pack and the preset power threshold is determined to determine the power level of the remaining power of the battery pack, and the power allocation priority of the electrical load is determined according to the power level. By dividing the power allocation priority of the electrical load at different power levels, when the electrical load requests power, the required power is provided to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to achieve reasonable allocation of the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization rate.

[0041] In some embodiments, the battery pack remaining power level is determined based on the relationship between the remaining battery pack power and a preset power threshold, including: if the remaining battery pack power is greater than the preset power threshold, the remaining battery pack power is determined to be at a high power level; if the remaining battery pack power is less than or equal to the preset power threshold, the remaining battery pack power is determined to be at a low power level. It can be understood that the remaining battery pack power corresponding to a high power level is greater than the remaining battery pack power corresponding to a low power level.

[0042] In this embodiment, a preset power threshold is set, for example, 3 kWh. When the remaining power of the battery pack is greater than the preset power threshold, i.e., the remaining power of the battery pack is > 3 kWh, the remaining power of the battery pack is considered high, and the remaining power of the battery pack is determined to be at a high power level. When the remaining power of the battery pack is less than or equal to the preset power threshold, i.e., the remaining power of the battery pack is ≤ 3 kWh, the remaining power of the battery pack is considered low, and the remaining power of the battery pack is determined to be at a low power level. It can be understood that by determining the relationship between the remaining power of the battery pack and the preset power threshold, the power level of the remaining power of the battery pack is determined, so as to determine the power allocation priority of the electrical load based on the remaining power of the battery pack.

[0043] In some embodiments, determining the power allocation priority of electrical loads based on the power level includes: when the power level is high, the power allocation priority of electrical loads from high to low includes: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device.

[0044] The first driving device ensures the basic driving functions of the vehicle, and the power required for these functions is the power necessary to overcome driving resistance. The second driving device ensures comfortable driving, and its purpose is to improve the comfort of the driver and passengers, as well as the driving performance.

[0045] In the embodiments, as shown in Table 1, the power allocation priority of the electrical load when the remaining power of the battery pack is at a high power level is shown in one embodiment of the present invention.

[0046] Table 1

[0047]

[0048]

[0049] As shown in Table 1, when the battery has a high remaining charge level, the power allocation priority of the electrical loads is arranged in descending order as shown in Table 1. When the battery pack has sufficient remaining charge, if all the above electrical loads have power requirements, the required power is provided to the above electrical loads level by level according to the power allocation priority of the electrical loads and the maximum available power at that charge level. If only some of the above electrical loads have power requirements, the required power is provided to the partial electrical loads according to the power allocation priority of the partial electrical loads at that charge level and the maximum available power at that charge level.

[0050] For example, in response to a power request from an electrical load, the required power is provided to the requesting electrical load based on power allocation priority and maximum available power. This includes: when responding to a power request from one of the following electrical loads—a DC / DC converter, a battery pack emergency cooling device, a defogging device, a defrosting device, a cabin cooling device, a cabin heating device, a power system cooling device, and a power system heating device—determining the required power of one electrical load, and providing the required power to the electrical load using the maximum available power when it meets the required power of that electrical load; when responding to multiple power requests from the following electrical loads—a DC / DC converter, a battery pack emergency cooling device, a defogging device, a defrosting device, a cabin cooling device, a cabin heating device, a power system cooling device, and a power system heating device—determining the power allocation priority of the multiple electrical loads, providing the corresponding required power to the current priority electrical load based on the maximum available power according to the power allocation priority, calculating the remaining power after the maximum available power meets the required power of the current priority electrical load, and using the remaining power to provide the required power to the next priority electrical load when the remaining power meets the required power of the next priority electrical load.

[0051] In the embodiment, as shown in Table 1, the DC / DC converter has the highest priority. When the vehicle is in a high-voltage state, the DC / DC converter will always be in operation to ensure the normal operation of the vehicle controller, central control screen, and battery. Therefore, the DC / DC converter has the highest priority. When responding to the power request of the DC / DC converter, and the maximum available power meets the power requirements of the DC / DC converter, the required power of the DC / DC converter is determined, and the required power is provided to the DC / DC converter using the maximum available power.

[0052] The battery pack emergency cooling device operates when the battery pack requires emergency cooling. Its priority is second only to the DC / DC converter. Upon receiving a power request from the emergency cooling device, the thermal management control system responds by sending the requested power to the VCU (Vehicle Control Unit) via CAN (Controller Area Network). After processing by the VCU, the remaining power for the emergency cooling function is sent to the actuator, which then executes the cooling command. Specifically, if both the DC / DC converter and the emergency cooling device are involved, the required power for the emergency cooling function is the maximum available power minus the required power of the DC / DC converter. If, after subtracting the DC / DC converter's required power from the maximum available power, the remaining power still meets the emergency cooling device's power requirement, then the remaining power is used to provide the required power. If only the emergency cooling device has a power requirement, the vehicle controller determines the required power for the emergency cooling device and uses the maximum available power to provide it.

[0053] The first driving device is used to ensure the basic driving functions of the vehicle. The basic driving functions have a lower priority than the DC / DC converter and the battery pack emergency cooling device. When calculating the power requirement of the basic driving functions, if the DC / DC converter, the battery pack emergency cooling device, and the first driving device all have power requirements, the remaining power is obtained by subtracting the power requirement of the DC / DC converter from the maximum available power at that power level and then subtracting the power requirement of the battery pack emergency cooling device. If the remaining power meets the basic driving functions after processing by the vehicle controller, the power requirement of the basic driving functions is determined based on the remaining power. If only the basic driving functions have power requirements, the power requirement of the basic driving functions is determined by the vehicle controller, and the maximum available power is used to provide the required power for the basic driving functions. If only one of the DC / DC converter and the battery pack emergency cooling device has power requirements, the remaining power is obtained by subtracting the power requirement of the electrical load with power requirements from the maximum available power. If the remaining power meets the basic driving functions after processing by the vehicle controller, the required power for the basic driving functions is provided based on the remaining power.

[0054] The defogger is used to ensure the vehicle's defogging function. When the vehicle needs defogging, the power requirement of the defogger is calculated. If the DC / DC converter, the battery pack emergency cooling device, and the first driving device all have power requirements, the remaining power is calculated as follows: maximum available power at this energy level - power requirement of the DC / DC converter - power requirement of the battery pack emergency cooling device - power requirement of the first driving device. If the remaining power, after processing by the vehicle controller, meets the defogging function requirements, the power requirement for the defogging function is determined based on the remaining power. If two of the DC / DC converter, the battery pack emergency cooling device, and the first driving device have power requirements, the remaining power is calculated as follows: maximum available power - power requirement. The required power of the electrical load is calculated to obtain the remaining power. If the remaining power, after processing by the vehicle controller, meets the defogging requirement, the required power for the defogging function is determined based on the remaining power. If only one of the DC / DC converter, battery pack emergency cooling device, and first driving device has a power requirement, the remaining power is obtained by subtracting the required power of the electrical load with a power requirement from the maximum available power. If the remaining power, after processing by the vehicle controller, meets the defogging requirement, the required power for the defogging function is determined based on the remaining power. If none of the DC / DC converter, battery pack emergency cooling device, and first driving device have a power requirement, the required power for the defogging device is provided based on the maximum available power.

[0055] The defrosting device is used to ensure the defrosting of the vehicle. When the vehicle needs defrosting, the body controller sends the power requirement of the defrosting function to the vehicle controller. After processing by the vehicle controller, the required power of the defrosting device is determined to ensure the normal operation of the vehicle's defrosting function. When calculating the power demand for defrosting, if multiple components such as the DC / DC converter, battery pack emergency cooling device, first traction device, and defrosting device have power demands, the power allocation priority of these multiple electrical loads at that power level is determined. Based on the power allocation priority, the corresponding power demand is provided to the current priority electrical load according to the maximum available power. The remaining power after the maximum available power satisfies the power demand of the current priority electrical load is calculated. When the remaining power satisfies the power demand of the next priority electrical load, the remaining power is used to provide the power demand for that next priority electrical load. For example, when the DC / DC converter, battery pack emergency cooling device, first traction device, and defrosting device all have power demands, the remaining power is calculated by subtracting the power demand of the DC / DC converter, the power demand of the battery pack emergency cooling device, the power demand of the first traction device, and the power demand of the defrosting device from the maximum available power. When the remaining power satisfies the power demand of the defrosting device, the power demand is provided to the defrosting device based on the remaining power.

[0056] The second driving device is used to ensure the comfort driving function, that is, the comfort of the driver and passengers. When there is a requirement for the comfort driving function, the body controller will send the power requirement of the second driving function to the vehicle controller. After processing by the vehicle controller, the required power of the second driving function is determined to ensure the normal operation of the second driving function. When calculating the power requirements of the comfort driving function, if multiple components such as the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, and defrosting device have power requirements, the power allocation priority of these multiple electrical loads within the first power range is determined. Based on the power allocation priority, the corresponding required power is provided to the current priority electrical load according to the maximum available power. The remaining power after the maximum available power meets the power requirements of the current priority electrical load is calculated. When the remaining power meets the power requirements of the next priority electrical load, the required power provided to the next priority electrical load is used. For example, when the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, and defrosting device all have power requirements, the remaining power is calculated as: maximum available power - DC / DC converter required power - battery pack emergency cooling device required power - first driving device required power - defogging device required power - defrosting device required power. When the remaining power meets the power requirements of the comfort driving function, the required power is provided to the comfort driving function based on the remaining power.

[0057] The cabin cooling system ensures the vehicle cabin's cooling function requirements. The body controller sends the cabin cooling power demand to the vehicle controller. After processing, the vehicle controller obtains the required power for the cabin cooling function and releases the corresponding power to ensure its normal operation. When calculating the cabin cooling power demand, if multiple components such as the DC / DC converter, battery pack emergency cooling device, first driving device, defrosting device, and second driving device have power demands, the power allocation priority of these multiple electrical loads at that power level is determined. Based on the power allocation priority and the maximum available power, the corresponding required power is provided to the current priority electrical load. The maximum available power is calculated to satisfy the current priority electrical load's power demand. The remaining power after the required power of the load is used to provide the required power for the next priority load when the remaining power meets the required power of the current priority load. For example, when the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, and second driving device all have power requirements, the remaining power is calculated as follows: maximum available power - required power of DC / DC converter - required power of battery pack emergency cooling device - required power of first driving device - required power of defogging device - required power of defrosting device - required power of second driving device. When the remaining power meets the requirements of the cabin cooling function, the required power is provided for the cabin cooling function based on the remaining power.

[0058] The cabin heating system ensures the vehicle cabin heating function meets requirements. The body controller sends the cabin heating power demand to the vehicle controller. After processing, the vehicle controller obtains the required power for the cabin heating function and releases the corresponding power to ensure its normal operation. When calculating the cabin heating power demand, if multiple electrical loads—including the DC / DC converter, battery pack emergency cooling device, first driving device, defrosting device, second driving device, and cabin cooling device—have power demands, the power allocation priority for these loads at that power level is determined. Based on this priority, the corresponding power demand is provided to the current priority load according to the maximum available power. The calculation then ensures that the maximum available power meets the power demand of the current priority load. The remaining power is used to provide the required power for the next priority electrical load when the remaining power meets the power requirements of the current priority electrical load. For example, if the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, and vehicle cabin cooling device all have power requirements, then the remaining power is calculated by subtracting the maximum available power from the required power of the DC / DC converter, the required power of the battery pack emergency cooling device, the required power of the first driving device, the required power of the defogging device, the required power of the defrosting device, the required power of the second driving device, and the required power of the vehicle cabin cooling device. When the remaining power meets the requirements of the vehicle cabin heating function, the required power is provided for the vehicle cabin heating function based on the remaining power.

[0059] The powertrain cooling system ensures the cooling function of the powertrain, which in turn ensures the efficient operation of the DC / DC converter and motor, requiring sufficient cooling power. When the vehicle has a powertrain cooling requirement, the body controller sends the power demand to the vehicle controller. The vehicle controller processes this information, determines the required power for the powertrain cooling system, and releases the corresponding power to ensure its normal operation. When calculating the required power for the powertrain cooling function, if multiple components such as the DC / DC converter, battery pack emergency cooling system, first driving device, defrosting device, second driving device, cabin cooling system, and cabin heating system have power demands, the power allocation priority for these multiple electrical loads at that power level is determined. Based on the maximum available power, the corresponding required power is provided to the current priority electrical load according to the power allocation priority. The remaining power after the maximum available power meets the current priority electrical load's power demand is calculated. If the remaining power meets the power demand of the next priority electrical load, the remaining power is used to provide power to the next priority electrical load. When the required power is provided by the vehicle, such as the power demand of the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, and cabin heating device, the remaining power is obtained by subtracting the required power of the DC / DC converter, the required power of the battery pack emergency cooling device, the required power of the first driving device, the required power of the defogging device, the required power of the defrosting device, the required power of the second driving device, the required power of the vehicle cabin cooling device, and the required power of the cabin heating device from the maximum available power. When the remaining power meets the cooling requirements of the power system, the required power is provided for the cooling function of the power system based on the remaining power.

[0060] The powertrain heating system ensures the heating function of the powertrain system. This function is used in extremely cold weather when the battery pack has very low remaining charge. Before driving, the battery pack is heated to a preset temperature, such as 25°C, to maintain vehicle performance. If the vehicle's powertrain system requires heating, the body controller sends the power demand to the vehicle controller. After processing, the vehicle controller determines the required power of the powertrain heating system and releases the corresponding power to ensure the normal operation of the vehicle's powertrain heating function. When calculating the power demand of the powertrain heating function, if multiple electrical loads, including the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, and powertrain cooling device, have power demands, then the power allocation priority of these multiple electrical loads at that power level is determined. Based on the maximum available power, the corresponding power demand of the current priority electrical load is provided according to the power allocation priority. The remaining power after the maximum available power meets the power demand of the current priority electrical load is calculated. When the remaining power meets the power demand of the next priority electrical load, the remaining power is used to provide the power demand of the next priority electrical load. When the DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, and powertrain cooling device all have power requirements, the remaining power is obtained by subtracting the required power of the DC / DC converter from the required power of the battery pack emergency cooling device, the required power of the first driving device, the required power of the defogging device, the required power of the defrosting device, the required power of the second driving device, the required power of the vehicle cabin cooling device, the required power of the cabin heating device, and the required power of the powertrain cooling device. When the remaining power meets the powertrain heating requirements, the required power is provided for the powertrain heating function based on the remaining power.

[0061] When the maximum power of the battery pack can meet the power requests of the above-mentioned electrical load priorities, there is still power redundancy. This redundant power can be used for motor drive to increase the overall vehicle dynamics. Therefore, the motor's required power = the power required for basic driving functions + the power required for comfort driving functions + the available power.

[0062] In some embodiments, the energy management method for the power battery further includes: when responding to a power request from a second driving device, determining the power allocation priority of the second driving device and the driving mode of the vehicle; and providing a preset required power to the second driving device according to the power allocation priority, maximum available power, and driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode, or economy mode. It is understood that the required power of the second driving device is a preset required power provided to the second driving device according to the driving mode of the vehicle when responding to a power request from the second driving device. That is, the required power of the second driving device is preset, and when it has a power demand, if the remaining power meets the required power of the second driving device, the remaining power is used to provide the preset required power to the second driving device. The preset required power is only related to the driving mode of the vehicle; different driving modes correspond to different preset required power for the second driving device.

[0063] In an embodiment, as shown in Table 2, there is a correspondence between the driving modes of the second driving device and the available power of the battery pack in one embodiment of the present invention.

[0064] Table 2

[0065]

[0066] As shown in Table 2, when responding to a power request from the second driving device, the power allocation priority of the second driving device and the current driving mode of the vehicle are determined. The available power of the battery pack is determined based on the electrical load preceding the priority of the second driving device. The required power of the second driving device is then determined by looking up a table based on the available power and the vehicle's driving mode. It is understandable that the required power of the comfort driving function of the second driving device varies in different driving modes. Specifically, the required power of the comfort driving function of the second driving device is higher in Sport mode, moderate in Normal mode, and lowest in Eco mode. By determining the vehicle's driving mode, the required power of the comfort driving function of the second driving device can be more finely divided to achieve a reasonable allocation of the maximum available power.

[0067] In some embodiments, determining the power allocation priority of electrical loads based on the power level includes: when the power level is low, determining the power allocation priority of electrical loads from high to low as follows: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device and defrosting device.

[0068] In the embodiments, as shown in Table 3, the power allocation priority of the battery pack when the remaining power is at a low level is shown in one embodiment of the present invention.

[0069] Table 3

[0070] Priority Electrical loads 1 DC / DC converter 2 Battery pack emergency cooling device 3 First traveling device 4 Defogging device 5 Defrosting device

[0071] As shown in Table 3, when the battery's remaining charge is at a low level, the power allocation priority of the electrical loads is arranged in descending order as shown in Table 3. When the battery pack has sufficient remaining charge, if all the above electrical loads have power requirements, then the above electrical loads are supplied power level by level according to the power allocation priority of the electrical loads at that charge level and the maximum available power. If only some of the above electrical loads have power requirements, then the power is supplied to the partial electrical loads according to the power allocation priority of the partial electrical loads at that charge level and the maximum available power.

[0072] For example, responding to a power request from an electrical load and providing the required power to the requesting electrical load according to power allocation priority and maximum available power includes: when responding to a power request from one of the DC / DC converter, battery pack emergency cooling device, defogging device, and defrosting device, determining the required power of the electrical load, and providing the required power to the electrical load using the maximum available power when the maximum available power meets the required power of the electrical load; when responding to multiple power requests from the DC / DC converter, battery pack emergency cooling device, defogging device, and defrosting device, determining the power allocation priority of multiple electrical loads, providing the corresponding required power to the current priority electrical load according to the power allocation priority and based on the maximum available power, calculating the remaining power after the maximum available power meets the required power of the current priority electrical load, and using the remaining power to provide the required power to the next priority electrical load when the remaining power meets the required power of the next priority electrical load.

[0073] In the embodiment, as shown in Table 3, the DC / DC converter has the highest priority. When the vehicle is in a high-voltage state, the DC / DC converter will always be in operation to ensure the normal operation of the vehicle controller, central control screen, and battery. Therefore, the DC / DC converter has the highest priority. When the maximum available power meets the power requirements of the DC / DC converter, the required power of the DC / DC converter is determined, and the maximum available power is used to provide the required power to the DC / DC converter.

[0074] The battery pack emergency cooling device operates when the battery pack requires cooling. Its priority is second only to the DC / DC converter. Upon receiving a power request from the emergency cooling device, the thermal management control system, responding to the urgent cooling need, sends the required power to the VCU via CAN communication. After processing by the VCU, the remaining power for the emergency cooling function is sent to the actuator, which ultimately executes the cooling command. Specifically, if both the DC / DC converter and the emergency cooling device require power, the required cooling power for the emergency cooling device is the maximum available power minus the DC / DC converter's required power. If, after subtracting the DC / DC converter's required power from the maximum available power, the remaining power still meets the emergency cooling device's power requirement, then the remaining power is used to provide the required power. If only the emergency cooling device requires power, the vehicle controller determines the required power for the emergency cooling device and uses the maximum available power to provide it.

[0075] The first driving device is used to ensure the basic driving functions of the vehicle. The basic driving functions have a lower priority than the DC / DC converter and the battery pack emergency cooling device. When calculating the power requirement of the basic driving functions, if the DC / DC converter, the battery pack emergency cooling device, and the first driving device all have power requirements, the remaining power is obtained by subtracting the power requirement of the DC / DC converter from the maximum available power at that power level and then subtracting the power requirement of the battery pack emergency cooling device. If the remaining power meets the basic driving functions after processing by the vehicle controller, the power requirement of the basic driving functions is determined based on the remaining power. If only the basic driving functions have power requirements, the power requirement of the basic driving functions is determined by the vehicle controller, and the maximum available power is used to provide the required power for the basic driving functions. If only one of the DC / DC converter and the battery pack emergency cooling device has power requirements, the remaining power is obtained by subtracting the power requirement of the electrical load with power requirements from the maximum available power. If the remaining power meets the basic driving functions after processing by the vehicle controller, the required power for the basic driving functions is provided based on the remaining power.

[0076] The defogger is used to ensure the vehicle's defogging function. When the vehicle needs defogging, the power requirement of the defogger is calculated. If the DC / DC converter, the battery pack emergency cooling device, and the first driving device all have power requirements, the remaining power is calculated as follows: maximum available power at this energy level - power requirement of the DC / DC converter - power requirement of the battery pack emergency cooling device - power requirement of the first driving device. If the remaining power, after processing by the vehicle controller, meets the defogging function requirements, the power requirement for the defogging function is determined based on the remaining power. If two of the DC / DC converter, the battery pack emergency cooling device, and the first driving device have power requirements, the remaining power is calculated as follows: maximum available power - power requirement. The required power of the electrical load is calculated to obtain the remaining power. If the remaining power, after processing by the vehicle controller, meets the defogging requirement, the required power for the defogging function is determined based on the remaining power. If only one of the DC / DC converter, battery pack emergency cooling device, and first driving device has a power requirement, the remaining power is obtained by subtracting the required power of the electrical load with a power requirement from the maximum available power. If the remaining power, after processing by the vehicle controller, meets the defogging requirement, the required power for the defogging function is determined based on the remaining power. If none of the DC / DC converter, battery pack emergency cooling device, and first driving device have a power requirement, the required power for the defogging device is provided based on the maximum available power.

[0077] The defrosting device is used to ensure the defrosting of the vehicle. When the vehicle needs defrosting, the body controller sends the power requirement of the defrosting function to the vehicle controller. After processing by the vehicle controller, the required power of the defrosting device is determined to ensure the normal operation of the vehicle's defrosting function. When calculating the power demand for defrosting, if multiple components such as the DC / DC converter, battery pack emergency cooling device, first traction device, and defrosting device have power demands, the power allocation priority of these multiple electrical loads at that power level is determined. Based on the power allocation priority, the corresponding power demand is provided to the current priority electrical load according to the maximum available power. The remaining power after the maximum available power satisfies the power demand of the current priority electrical load is calculated. When the remaining power satisfies the power demand of the next priority electrical load, the remaining power is used to provide the power demand for that next priority electrical load. For example, when the DC / DC converter, battery pack emergency cooling device, first traction device, and defrosting device all have power demands, the remaining power is calculated by subtracting the power demand of the DC / DC converter, the power demand of the battery pack emergency cooling device, the power demand of the first traction device, and the power demand of the defrosting device from the maximum available power. When the remaining power satisfies the power demand of the defrosting device, the power demand is provided to the defrosting device based on the remaining power.

[0078] In some embodiments, the energy management method for the power battery further includes: when responding to a power request from the first driving device, determining the power allocation priority of the first driving device and the driving mode of the vehicle; and providing the first driving device with a preset required power according to the power allocation priority of the first driving device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes a sport mode, a normal mode or an economy mode.

[0079] In this embodiment, the power allocation priority and maximum available power of the first driving device are different when the remaining power of the battery pack is at different levels.

[0080] Table 4 shows the correspondence between the driving mode of the first driving device and the maximum available power of the battery pack under the high power level of one embodiment of the present invention.

[0081]

[0082]

[0083] As shown in Table 4, when responding to a power request from the first driving device, the power allocation priority of the first driving device and the current driving mode of the vehicle are determined. The remaining power of the battery, i.e., the available power of the battery pack, is determined based on the electrical load preceding the priority of the first driving device. The required power of the first driving device is determined by looking up a table based on the available power and the driving mode of the vehicle. The required power of the first driving device is a preset required power provided to the first driving device when a power request is received, according to the driving mode of the vehicle. That is, the required power of the first driving device is preset. When it has a power demand, if the available power meets the required power of the first driving device, the available power is used to provide the preset required power to the first driving device. The preset required power is only related to the driving mode of the vehicle. Different driving modes correspond to different preset required power of the first driving device.

[0084] The power requirements for the basic driving functions of the first driving device vary depending on the driving mode. Specifically, the power requirement is higher in Sport mode, moderate in Normal mode, and lowest in Eco mode. By determining the vehicle's driving mode, the power requirements for the basic driving functions of the first driving device can be more precisely defined, allowing for a more rational allocation of the maximum available power.

[0085] Table 5 shows the correspondence between the driving mode of the first driving device and the maximum available power of the battery pack under low battery level according to an embodiment of the present invention.

[0086]

[0087] As shown in Table 5, when responding to a power request from the first driving device, the power allocation priority of the first driving device and the current driving mode of the vehicle are determined. The available power of the battery is determined based on the electrical load prior to the first driving device's priority, i.e., the available power of the battery pack. The required power of the first driving device is determined by looking up a table based on the available power and the vehicle's driving mode. The required power of the first driving device is a preset required power provided to the first driving device when a power request is received, according to the vehicle's driving mode. That is, the required power of the first driving device is preset. When it has a power demand, if the available power meets the required power of the first driving device, the available power is used to provide the preset required power to the first driving device. The preset required power is only related to the vehicle's driving mode. Different driving modes correspond to different preset required power of the first driving device.

[0088] The power requirements for the basic driving functions of the first driving device vary depending on the driving mode. Specifically, the power requirement is higher in Sport mode, moderate in Normal mode, and lowest in Eco mode. By determining the vehicle's driving mode, the power requirements for the basic driving functions of the first driving device can be more precisely defined, allowing for a more rational allocation of the maximum available power.

[0089] The power requirements for basic driving functions can be determined using a two-dimensional lookup table based on the customer's selected driving mode and the current available power of the battery pack. The power transmission path for this basic driving function is as follows: The VCU (Vehicle Control Unit) collects signals from the accelerator and brake pedals, processes them, and sends the appropriate torque to the motor controller. The motor controller then adjusts the motor speed and torque via PWM (Pulse Width Modulation). At this point, the motor acts merely as a passive actuator. The VCU sends the required torque to the motor while simultaneously providing power, and the motor then performs the necessary actions. The motor does not actively request power from the VCU.

[0090] In summary, by determining the relationship between the remaining battery pack charge and a preset charge threshold, the charge level of the remaining battery pack charge is determined, and the power allocation priority of the electrical load is determined according to the charge level. By dividing the power allocation priority of the electrical load at different charge levels, when the electrical load requests power, the required power is provided to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization.

[0091] The energy management device for a power battery according to an embodiment of the present invention is described below.

[0092] like Figure 2As shown, the power battery energy management device 2 of this embodiment includes an acquisition module 20, a first determination module 21, a second determination module 22, and a response module 23. The acquisition module 20 is used to acquire the maximum available power of the battery pack corresponding to the remaining power of the battery pack. The first determination module 21 is used to determine the power level of the remaining power of the battery pack based on the relationship between the remaining power of the battery pack and a preset power threshold. The second determination module 22 is used to determine the power allocation priority of the electrical load based on the power level. The response module 23 is used to respond to the power request of the electrical load and provide the required power to the electrical load with the power request based on the power allocation priority and the maximum available power.

[0093] According to an embodiment of the present invention, the power battery energy management device 2 determines the power level of the remaining power of the battery pack by determining the relationship between the remaining power of the battery pack and a preset power threshold, and determines the power allocation priority of the electrical load according to the power level. By dividing the power allocation priority of the electrical load at different power levels, when the electrical load requests power, the device provides the required power to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization rate.

[0094] In some embodiments, the first determining module 21 is specifically used to: determine the remaining battery pack power level as high when the remaining battery pack power is greater than the preset power threshold; and determine the remaining battery pack power level as low when the remaining battery pack power is less than or equal to the preset power threshold.

[0095] In some embodiments, the second determining module 22 is specifically used to: when the power level is at a high power level, the power allocation priority of the electrical load from high to low includes: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, power system cooling device and power system heating device.

[0096] In some embodiments, the response module 23 is specifically configured to: when responding to a power request from one of the DC / DC converter, battery pack emergency cooling device, defogging device, defrosting device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device, determine the required power of the electrical load, and provide the required power to the electrical load using the maximum available power when the maximum available power meets the required power of the electrical load; when responding to multiple power requests from the DC / DC converter, battery pack emergency cooling device, defogging device, defrosting device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device, determine the power allocation priority of multiple electrical loads, provide the corresponding required power to the current priority electrical load based on the maximum available power according to the power allocation priority, calculate the remaining power after the maximum available power meets the required power of the current priority electrical load, and provide the required power to the next priority electrical load using the remaining power when the remaining power meets the required power of the next priority electrical load of the current priority electrical load.

[0097] In some embodiments, the response module 23 is further configured to: when responding to a power request from the second vehicle device, determine the power allocation priority of the second vehicle device and the driving mode of the vehicle; and provide the second vehicle device with a preset required power according to the power allocation priority of the second vehicle device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode or economy mode.

[0098] In some embodiments, the second determining module 22 is specifically used to: when the power level is at a low power level, determine the power allocation priority of the electrical load from high to low, including: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device and defrosting device.

[0099] In some embodiments, the response module 23 is specifically configured to: when responding to a power request from one of the DC / DC converter, battery pack emergency cooling device, defogging device, and defrosting device, determine the required power of the electrical load, and provide the required power to the electrical load using the maximum available power when the maximum available power meets the required power of the electrical load; when responding to multiple power requests from the DC / DC converter, battery pack emergency cooling device, defogging device, and defrosting device, determine the power allocation priority of multiple electrical loads, provide the corresponding required power to the current priority electrical load according to the power allocation priority, based on the maximum available power, calculate the remaining power after the maximum available power meets the required power of the current priority electrical load, and provide the required power to the next priority electrical load using the remaining power when the remaining power meets the required power of the next priority electrical load of the current priority electrical load.

[0100] In some embodiments, the response module 23 is further configured to: when responding to a power request from the first driving device, determine the power allocation priority of the first driving device and the driving mode of the vehicle; and provide the first driving device with a preset required power according to the power allocation priority of the first driving device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode or economy mode.

[0101] The vehicle according to an embodiment of the present invention is described below.

[0102] like Figure 3 As shown, the vehicle 3 of this embodiment includes the energy management device 2 of the power battery described in the above embodiment.

[0103] According to the vehicle 3 of the present invention, by determining the relationship between the remaining battery charge and a preset charge threshold, the charge level of the remaining battery charge is determined, and the power allocation priority of the electrical load is determined according to the charge level. By dividing the power allocation priority of the electrical load at different charge levels, when the electrical load requests power, the required power is provided to the electrical load requesting power according to the power allocation priority and the maximum available power, so as to reasonably allocate the maximum available power of the battery pack, thereby increasing the corresponding driving range while improving the overall vehicle comfort and energy utilization.

[0104] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0105] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for energy management of a power battery, characterized in that, include: Obtain the maximum available power of the battery pack corresponding to the remaining battery power; The remaining battery pack power level is determined based on the relationship between the remaining battery pack power and a preset power threshold. Determining the power allocation priority of electrical loads based on the power level includes: when the power level is high, the power allocation priority of the electrical loads from high to low includes: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device. If the remaining power of the battery pack is greater than the preset power threshold, the remaining power of the battery pack is determined to be at the high power level. The first driving device is a device to ensure the basic driving functions of the vehicle, and the second driving device is a device to ensure the comfortable driving of the vehicle. In response to the power request of the electrical load, the required power is provided to the electrical load with the power request according to the power allocation priority and the maximum available power. When responding to the power request of the second vehicle device, the power allocation priority of the second vehicle device and the driving mode of the vehicle are determined. The preset required power is provided to the second vehicle device according to the power allocation priority of the second vehicle device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode or economy mode.

2. The energy management method for a power battery according to claim 1, characterized in that, When determining the remaining battery pack capacity level based on the relationship between the remaining battery pack capacity and a preset capacity threshold, the method further includes: If the remaining power of the battery pack is less than or equal to the preset power threshold, the remaining power of the battery pack is determined to be at a low power level.

3. The energy management method for a power battery according to claim 1, characterized in that, Responding to the power request of the electrical load, providing the required power to the electrical load with the power request according to the power allocation priority and the maximum available power includes: When responding to a power request from one of the DC / DC converter, the battery pack emergency cooling device, the defogging device, the defrosting device, the cabin cooling device, the cabin heating device, the power system cooling device, and the power system heating device, the required power of the electrical load is determined, and when the maximum available power meets the required power of the electrical load, the required power is provided to the electrical load using the maximum available power; When responding to multiple power requests from the DC / DC converter, the battery pack emergency cooling device, the defogging device, the defrosting device, the cabin cooling device, the cabin heating device, the power system cooling device, and the power system heating device, the power allocation priority of the multiple electrical loads is determined. According to the power allocation priority, the corresponding required power is provided to the current priority electrical load based on the maximum available power. The remaining power after the maximum available power meets the required power of the current priority electrical load is calculated. When the remaining power meets the required power of the next priority electrical load of the current priority electrical load, the remaining power is used to provide the required power to the next priority electrical load.

4. The energy management method for a power battery according to claim 2, characterized in that, Determining the power allocation priority of the electrical load based on the power level includes: When the power level is low, the power allocation priority of the electrical load is determined from high to low as follows: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device and defrosting device.

5. The energy management method for a power battery according to claim 4, characterized in that, Responding to the power request of the electrical load, providing the required power to the electrical load with the power request according to the power allocation priority and the maximum available power includes: When responding to a power request from one of the DC / DC converter, the battery pack emergency cooling device, the defogging device, and the defrosting device, the required power of the electrical load is determined, and when the maximum available power meets the required power of the electrical load, the maximum available power is used to provide the required power to the electrical load; When responding to multiple power requests from the DC / DC converter, the battery pack emergency cooling device, the defogging device, and the defrosting device, the power allocation priority of the multiple electrical loads is determined. According to the power allocation priority, the corresponding required power is provided to the current priority electrical load based on the maximum available power. The remaining power after the maximum available power meets the required power of the current priority electrical load is calculated. When the remaining power meets the required power of the next priority electrical load of the current priority electrical load, the remaining power is used to provide the required power to the next priority electrical load.

6. The energy management method for a power battery according to claim 3 or 5, characterized in that, Also includes: When responding to the power request of the first driving device, the power allocation priority of the first driving device and the driving mode of the vehicle are determined; The first driving device is provided with a preset required power according to the power allocation priority of the first driving device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode or economy mode.

7. An energy management device for a power battery, characterized in that, include: The acquisition module is used to obtain the maximum available power of the battery pack corresponding to the remaining power of the battery pack; The first determining module is used to determine the power level of the remaining power of the battery pack based on the relationship between the remaining power of the battery pack and a preset power threshold. The second determining module is used to determine the power allocation priority of the electrical loads according to the power level. Specifically, when the power level is high, the power allocation priority of the electrical loads, from high to low, includes: DC / DC converter, battery pack emergency cooling device, first driving device, defogging device, defrosting device, second driving device, cabin cooling device, cabin heating device, power system cooling device, and power system heating device. If the remaining power of the battery pack is greater than the preset power threshold, the remaining power of the battery pack is determined to be at the high power level. The first driving device is a device to ensure the basic driving functions of the vehicle, and the second driving device is a device to ensure comfortable driving of the vehicle. A response module is used to respond to the power request of the electrical load, and to provide the required power to the electrical load with the power request according to the power allocation priority and the maximum available power. Specifically, when responding to the power request of the second vehicle device, the response module is used to determine the power allocation priority of the second vehicle device and the driving mode of the vehicle; and to provide the second vehicle device with a preset required power according to the power allocation priority of the second vehicle device, the maximum available power and the driving mode of the vehicle, wherein the driving mode includes sport mode, normal mode or economy mode.

8. A vehicle, characterized in that, include: The energy management device for a power battery as described in claim 7.

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