Control method and device for battery heating

Abstract

The application provides a battery heating control method and device. The method comprises the following steps: obtaining a vehicle driving state, an ambient temperature and a vehicle parameter; determining corresponding to-be-consumed power when the ambient temperature and the vehicle parameter meet corresponding motor residual heat battery heating conditions in different vehicle states; distributing the to-be-consumed power to a motor controller and sending a heating request to the motor controller, so that the motor converts the to-be-consumed power into heat to heat the battery by heating a battery water circuit. The application can heat the battery by using motor residual heat, can improve motor residual heat utilization, can reduce energy consumption, and can determine appropriate motor residual heat battery heating to-be-consumed power in different driving states, can reasonably utilize vehicle power, and can reduce vehicle power.

Description

Technical Field

[0001] This invention relates to the field of vehicle thermal management technology, and in particular to a control method and apparatus for battery heating. Background Technology

[0002] The power batteries of pure electric vehicles are affected by extreme low-temperature conditions, which limits their charging and discharging capabilities and weakens the overall power performance of the vehicle.

[0003] Currently, the industry standard approach is to address the problems caused by low temperatures by increasing the battery temperature. Existing technology can use PTC (Positive Temperature Coefficient) heating to heat the battery under low-temperature conditions. The PTC heating element heats the coolant, which is then pumped through the battery's cold plate to achieve the effect of heating the battery.

[0004] However, using PTC to heat the battery leads to high energy consumption for battery heating. Summary of the Invention

[0005] This invention provides a battery heating control method and apparatus to solve the problem of high energy consumption in battery heating caused by using PTC heating in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a method for controlling battery heating, comprising:

[0007] Acquire vehicle driving status, ambient temperature, and vehicle parameters;

[0008] Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

[0009] The power to be consumed is allocated to the motor controller, and a heating request is sent to the motor controller so that the motor converts the power to be consumed into heat and heats the battery by heating the battery water circuit.

[0010] In one possible implementation, the vehicle parameters include battery cell temperature and battery water inlet temperature;

[0011] Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined, including:

[0012] During vehicle charging, when the ambient temperature and the battery cell temperature meet the corresponding conditions for heating the battery with waste heat from the motor, or when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

[0013] In one possible implementation, determining the corresponding power to be consumed includes:

[0014] Under vehicle charging conditions, obtain the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller;

[0015] The power to be consumed is determined based on the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller.

[0016] In one possible implementation, determining the power to be consumed based on the current charging power, the currently permissible discharge power of the battery management system, and the power consumed by the accessory controller includes:

[0017] According to P 待 =P 充 +P M -P 附 Determine the power to be consumed;

[0018] In the formula, P 待 P represents the power consumed when the motor's waste heat heats the battery during vehicle charging. 充 P represents the current charging power. M P represents the current allowable discharge power of the battery management system. 附 This indicates the power consumption of the accessory controller.

[0019] In one possible implementation, the vehicle parameters include battery cell temperature, battery water inlet temperature, vehicle speed, and battery SOC.

[0020] Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined, including:

[0021] Under vehicle operating conditions, when the ambient temperature, the battery cell temperature, the vehicle speed, and the battery SOC meet the corresponding conditions for heating the battery with waste heat from the motor, or when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

[0022] In one possible implementation, determining the corresponding power to be consumed includes:

[0023] Under vehicle operating conditions, obtain the current continuous discharge power of the battery management system and the power consumed by the accessory controller;

[0024] Based on different vehicle speeds and different battery SOCs, the corresponding power consumption parameters are determined. At the same vehicle speed, the higher the battery SOC, the higher the corresponding power consumption parameters.

[0025] The power to be consumed is determined based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters.

[0026] In one possible implementation, determining the power to be consumed based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters includes:

[0027] According to P 待 '=(P 持 -P 附 A determines the power to be consumed;

[0028] In the formula, P 待 'P' indicates the power consumed by the motor's waste heat to heat the battery during vehicle operation. 持 This indicates the current continuous discharge power of the battery management system, P. 附 This indicates the power consumption of the accessory controller, where A represents the power consumption parameter.

[0029] In one possible implementation, when the ambient temperature is less than or equal to a first ambient temperature during vehicle operation, after determining the corresponding power to be consumed, or after allocating the power to be consumed to the motor controller and sending a heating request to the motor controller, the method further includes:

[0030] Set the battery water pump opening to the first setting.

[0031] Control the water pump motor opening to the second opening degree;

[0032] The first opening is smaller than the second opening.

[0033] One possible implementation also includes:

[0034] When the vehicle is charging, the battery is heated by the waste heat of the motor. When the ambient temperature, battery cell temperature and battery water inlet temperature meet the corresponding conditions for stopping battery heating, a stop heating request is sent to the motor controller.

[0035] When the vehicle is in operation, after the battery is heated by the residual heat of the motor, a stop heating request is sent to the motor controller when the water temperature at the battery water inlet meets the conditions for stopping battery heating.

[0036] Secondly, embodiments of the present invention provide a battery heating control device, comprising:

[0037] The acquisition module is used to acquire vehicle driving status, ambient temperature, and vehicle parameters.

[0038] The calculation module is used to determine the corresponding power to be consumed when the ambient temperature and the vehicle parameters meet the corresponding conditions for heating the battery with the waste heat of the motor under different vehicle conditions.

[0039] The processing module is used to allocate the power to be consumed to the motor controller and send a heating request to the motor controller so that the motor can convert the power to be consumed into heat and heat the battery by heating the battery water circuit.

[0040] This invention provides a battery heating control method and apparatus. It acquires vehicle driving status, ambient temperature, and vehicle parameters. Under different vehicle states, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with motor waste heat, it determines the corresponding power to be consumed. The power to be consumed is allocated to the motor controller, and a heating request is sent to the motor controller so that the motor converts the power to be consumed into heat, which heats the battery water circuit. Using motor waste heat to heat the battery can improve the utilization rate of motor waste heat and reduce energy consumption. Furthermore, it can determine the appropriate power to be consumed for heating the battery with motor waste heat under different vehicle states, rationally utilizing the overall vehicle power and thus reducing overall vehicle power consumption. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating the implementation of the battery heating control method provided in this embodiment of the invention.

[0043] Figure 2 This is a schematic diagram of the battery water circuit provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the battery heating control device provided in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the controller provided in an embodiment of the present invention. Detailed Implementation

[0046] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0048] Figure 1 The following is a flowchart illustrating the implementation of a battery heating control method according to an embodiment of the present invention. The execution entity of the battery heating control method is the vehicle control unit (VCU), as detailed below:

[0049] Step 101: Obtain vehicle driving status, ambient temperature, and vehicle parameters.

[0050] When determining whether to activate the motor waste heat to heat the battery function, it is necessary to make a judgment based on the current vehicle driving status, ambient temperature and vehicle parameters. Therefore, it is necessary to first obtain the current vehicle driving status, ambient temperature and vehicle parameters.

[0051] Ambient temperature can be measured using a temperature sensor located outside the vehicle.

[0052] It should be noted that before step 101 is executed, the vehicle status must be checked by the VCU and the motor controller itself must be fault-free in order to ensure that the battery heating control method is executed sequentially.

[0053] Step 102: Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with the waste heat of the motor, determine the corresponding power to be consumed.

[0054] In one embodiment, under different driving conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with the waste heat of the motor, the function of heating the battery with the waste heat of the motor is first activated, then the corresponding power to be consumed is determined, and the motor controller is controlled to convert the power to be consumed into heat, which is then used to heat the battery through the battery water circuit.

[0055] Since the conditions for determining whether to activate the motor waste heat to heat the battery differ depending on the vehicle's condition, in this embodiment, the ambient temperature and vehicle parameters are determined separately under vehicle charging and vehicle driving conditions.

[0056] In one embodiment, during vehicle charging, the vehicle is stationary, and the acquired vehicle parameters may include battery cell temperature and battery coolant inlet temperature. The battery cell temperature is reported to the VCU via the battery management system, and the battery coolant inlet temperature is measured by a temperature sensor located at the battery coolant inlet and sent to the battery management system, which then reports it to the VCU.

[0057] When the ambient temperature and the battery cell temperature meet the conditions for heating the battery with waste heat from the motor during vehicle charging, the corresponding power to be consumed is determined.

[0058] Optionally, when the ambient temperature is less than or equal to a first ambient temperature and the battery cell temperature is less than a first battery cell temperature, the motor waste heat heating battery function is activated. The first ambient temperature can be set according to requirements; in this embodiment, its value is not limited, for example, it can be set to 0℃, 3℃, etc. The first battery cell temperature is the lowest target temperature that allows charging heating to begin; that is, when the battery cell temperature is less than the first battery cell temperature, the battery needs to be heated. The first battery cell temperature can be set according to requirements; in this embodiment, its value is not limited, for example, it can be set to 5℃, 6℃, etc.

[0059] Understandably, when the temperature of the first battery cell is higher than the temperature of the second battery cell, there is no need to heat the battery, and therefore the motor waste heat heating battery function is not activated, and the process ends. It should be noted that in this embodiment, the battery cell temperature needs to be acquired in real time so that the motor waste heat heating battery function is activated when the battery cell temperature meets the conditions, and deactivated or exited when the battery cell temperature does not meet the conditions. This ensures that the battery's charging and discharging capacity is not limited, reduces the probability of battery damage, and improves battery life.

[0060] During vehicle charging, when the ambient temperature and the battery water inlet temperature meet the conditions for heating the battery with the motor's waste heat, the corresponding power to be consumed is determined. Optionally, when the ambient temperature is less than or equal to a first ambient temperature and heating the battery with the motor's waste heat stops, and the battery water inlet temperature is less than or equal to a first water temperature, the function of heating the battery with the motor's waste heat is restarted to continue heating the battery.

[0061] Here, the first water temperature is the minimum water temperature set at the battery water inlet. Its value can be set based on experience. Since the water temperature at the battery water inlet is not the temperature of the battery cell, the battery needs to be heated by water. Therefore, there will be some energy loss during the water flow. Thus, the first water temperature is greater than the first battery cell temperature. For example, the first water temperature can be set to the first battery cell temperature plus 10°C, i.e., (T1+10)°C, where T1 is the first battery cell temperature.

[0062] In one embodiment, when the ambient temperature is higher than a first ambient temperature and the battery cell temperature is lower than a second battery cell temperature, the motor waste heat heating battery function is activated. Here, the second battery cell temperature is the lowest target temperature at which charging heating is allowed when the ambient temperature is higher than the first ambient temperature. Its value can be set according to requirements; in this embodiment, the value of the second battery cell temperature is not limited. For example, the second battery cell temperature can be 2℃, 3℃, etc. Therefore, the second battery cell temperature is lower than the first battery cell temperature.

[0063] In one embodiment, when the ambient temperature is higher than a first ambient temperature and heating of the battery using the motor's waste heat stops, the battery cell temperature is less than or equal to a third battery cell temperature, and the motor's waste heat heating function is activated. Here, the third battery cell temperature is the highest target temperature at which charging and heating can be stopped when the ambient temperature is higher than the first ambient temperature. Its value can be set according to requirements; in this embodiment, the value of the third battery cell temperature is not limited. For example, the third battery cell temperature can be 5°C, 6°C, etc. Therefore, the third battery cell temperature is greater than or equal to the first battery cell temperature.

[0064] In one embodiment, when the ambient temperature is greater than a first ambient temperature and the battery heating via motor waste heat stops, and the water temperature at the battery water inlet is less than or equal to a first water temperature, the motor waste heat battery heating function is activated. For example, when the ambient temperature is greater than 0°C, after heating the battery via motor waste heat for a period of time, the motor waste heat battery heating function is turned off when the battery cell temperature reaches the condition for stopping heating. At this time, the water temperature in the battery water circuit gradually decreases. The temperature sensor in the battery water circuit monitors the water temperature at the battery water inlet in real time and sends it to the VCU through the battery management system. When the VCU detects that the water temperature at the battery water inlet T3 ≤ T1 + 10, it needs to request the motor to heat the battery water circuit.

[0065] In one embodiment, see Figure 2 The battery water circuit diagram shown shows that the electric water pump 1, accessory controller 2, motor 3, temperature sensor 4, battery 5, and battery electric water pump 6 are connected in sequence. When the electric water pump 1 and motor 3 are turned on, the water in the battery water circuit flows through each device in sequence, and the heat generated by the motor 3 is transferred to the battery 5 through the heat in the water flow.

[0066] In one embodiment, after activating the function of using the motor's waste heat to heat the battery, the corresponding power to be consumed is determined, and the motor uses the determined power to generate heat to heat the battery. Optionally, during vehicle charging, the current charging power, the battery management system's currently allowed discharge power, and the accessory controller's power consumption are obtained; based on the current charging power, the battery management system's currently allowed discharge power, and the accessory controller's power consumption, the corresponding power to be consumed is determined.

[0067] The accessory controller here may include a DC-DC converter, an air conditioner (AC), a positive temperature coefficient (PTC), or a PTC thermistor, etc. The PTC can be a water heating PTC or a battery heating PTC.

[0068] Optionally, the power to be consumed is determined based on the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller, including: based on P 待 =P 充 +P M -P 附 Determine the power to be consumed; where P 待 P represents the power consumed when the motor's waste heat heats the battery during vehicle charging. 充 P represents the current charging power. M P represents the current allowable discharge power of the battery management system. 附 This indicates the power consumption of the accessory controller.

[0069] The following section details how to determine if the ambient temperature and vehicle parameters meet the conditions for heating the battery using the waste heat from the motor when the vehicle is in operation.

[0070] Under vehicle operating conditions, when the ambient temperature, battery cell temperature, vehicle speed, and battery SOC meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined. Optionally, when the ambient temperature is less than or equal to a first ambient temperature, the battery cell temperature is less than a fourth battery cell temperature, the vehicle speed is less than or equal to a second vehicle speed, and the battery SOC is greater than or equal to a first SOC, the function of heating the battery with waste heat from the motor is activated, and then the corresponding power to be consumed is determined. Here, the fourth battery cell temperature can be set according to requirements. In this embodiment, the value of the fourth battery cell temperature is not limited. For example, the fourth battery cell temperature can be 15℃, 17℃, etc.

[0071] The second speed can be set according to requirements. In this embodiment, the value of the second speed is not limited. For example, the second speed can be 15 km / h, 17 km / h, etc.

[0072] The State of Charge (SOC) of a battery reflects its remaining capacity. It is numerically defined as the ratio of remaining capacity to battery capacity, usually expressed as a percentage. The first SOC can be set according to needs. For example, the first SOC can be 20%, meaning that the motor's residual heat will only be activated to heat the battery when the battery SOC is at least 20%.

[0073] In one embodiment, when the ambient temperature is less than or equal to the first ambient temperature, the battery cell temperature is less than the fourth battery cell temperature, the vehicle speed is greater than the second vehicle speed but less than or equal to the fourth vehicle speed, and the battery SOC is greater than or equal to the second SOC, the function of heating the battery with the residual heat of the motor is activated, and then the corresponding power to be consumed is determined.

[0074] The fourth speed can be set according to requirements. In this embodiment, the value of the fourth speed is not limited. For example, the fourth speed can be 45 km / h, 47 km / h, etc.

[0075] The second SOC can be set according to requirements; for example, the second SOC can be 30%.

[0076] Among them, the fourth vehicle speed is greater than the second vehicle speed, and the second SOC is greater than the first SOC.

[0077] In one embodiment, when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

[0078] Optionally, when the ambient temperature is less than or equal to the first ambient temperature and the battery heating via motor waste heat has stopped, and the water temperature at the battery water inlet is less than or equal to the third water temperature, the motor waste heat heating function for the battery is activated, and then the corresponding power to be consumed is determined.

[0079] The third water temperature here can be set to 30℃.

[0080] In one embodiment, when the ambient temperature is greater than the first ambient temperature, the battery cell temperature is less than the fifth battery cell temperature, and the battery SOC is greater than or equal to the first SOC, the function of heating the battery with the waste heat of the motor is activated, and then the corresponding power to be consumed is determined.

[0081] Here, the temperature of the fifth battery cell is higher than that of the fourth battery cell, so it can be set to 25℃.

[0082] In one embodiment, when the ambient temperature is greater than the first ambient temperature and the battery heating via motor waste heat stops, and the battery cell temperature is less than or equal to the first battery cell temperature, the motor waste heat heating function is activated, and then the corresponding power to be consumed is determined.

[0083] Once it is determined, based on the ambient temperature, battery cell temperature, vehicle speed, and battery SOC, that the function of using the motor's waste heat to heat the battery can be activated, the corresponding power to be consumed is determined. Determining the corresponding power to be consumed may include: obtaining the current continuous discharge power of the battery management system and the power consumed by the accessory controller under vehicle operating conditions; determining the corresponding power consumption parameters based on different vehicle speeds and different battery SOCs, wherein at the same vehicle speed, the higher the battery SOC, the higher the corresponding power consumption parameters; and determining the power to be consumed based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters.

[0084] The following is a detailed description of the power consumption parameters determined based on different vehicle speeds and different battery SOCs when the ambient temperature is less than or equal to the first ambient temperature:

[0085] When the vehicle speed is less than or equal to the first vehicle speed, or the vehicle speed is greater than the first vehicle speed but less than or equal to the second vehicle speed, and the battery SOC is greater than or equal to the first SOC but less than the third SOC, the corresponding power consumption parameter is determined to be 10%.

[0086] When the vehicle speed is less than or equal to the first vehicle speed, or the vehicle speed is greater than the first vehicle speed but less than or equal to the second vehicle speed, and the battery SOC is greater than or equal to the third SOC but less than the fourth SOC, the corresponding power consumption parameter is determined to be 15%.

[0087] When the vehicle speed is less than or equal to the first vehicle speed, or the vehicle speed is greater than the first vehicle speed but less than or equal to the second vehicle speed, and the battery SOC is greater than or equal to the fourth SOC, the corresponding power consumption parameter is determined to be 20%.

[0088] Among them, the first SOC is less than the third SOC, and the third SOC is less than the fourth SOC. For example, the first SOC is 20%, the third SOC is 40%, and the fourth SOC is 60%.

[0089] When the vehicle speed is greater than the second speed and less than or equal to the third speed, or the vehicle speed is greater than the third speed and less than or equal to the fourth speed, and the battery SOC is greater than or equal to the second SOC and less than the fourth SOC, the corresponding power consumption parameter is determined to be 10%.

[0090] When the vehicle speed is greater than the second speed and less than or equal to the third speed, or the vehicle speed is greater than the third speed and less than or equal to the fourth speed, and the battery SOC is greater than or equal to the fourth SOC, the corresponding power consumption parameter is determined to be 15%.

[0091] When the vehicle speed is greater than the fourth speed, the battery heating function is not activated. At this time, the heat from the generator or the battery itself is sufficient to supply the heat required for battery charging and discharging, thus maintaining the battery's charging and discharging performance.

[0092] When the ambient temperature is higher than the first ambient temperature, regardless of vehicle speed, the system determines whether to activate the motor's waste heat heating function based solely on the battery's SOC. When the VCU detects high voltage on the vehicle and the gear is not in the PN gear, it acquires the battery cell temperature. At this time, the vehicle is in a state of preparing to drive but not yet moving. The vehicle speed is zero, and the corresponding power consumption parameters can be determined solely based on different battery SOCs, as detailed below:

[0093] When the vehicle speed is zero, the battery SOC is greater than or equal to the first SOC and less than the third SOC, and the corresponding power consumption parameter is determined to be 10%.

[0094] When the vehicle speed is zero and the battery SOC is greater than or equal to the third SOC and less than the fourth SOC, the corresponding power consumption parameter is determined to be 15%.

[0095] When the vehicle speed is zero and the battery SOC is greater than or equal to the fourth SOC, the corresponding power consumption parameter is determined to be 20%.

[0096] After determining the power consumption parameters, when determining the power to be consumed based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters, the following can be included:

[0097] According to P 待 '=(P 持 -P 附 A determines the power to be consumed;

[0098] In the formula, P 待 'P' indicates the power consumed by the motor's waste heat to heat the battery during vehicle operation. 持 This indicates the current continuous discharge power of the battery management system, P. 附 This indicates the power consumed by the accessory controller. A represents the power consumption parameter. The power consumption parameter determined under different vehicle speeds and different SOCs can be substituted into the formula for determining the power to be consumed.

[0099] It should be noted that when the ambient temperature is less than or equal to the first ambient temperature, the current continuous discharge power of the battery management system used to determine the power to be consumed does not consider the power of energy recovery. When the ambient temperature is greater than the first ambient temperature, the current continuous discharge power of the battery management system used to determine the power to be consumed can take into account the power of energy recovery based on the actual driving conditions.

[0100] Step 103: Allocate the power to be consumed to the motor controller and send a heating request to the motor controller so that the motor can convert the power to be consumed into heat and heat the battery by heating the battery water circuit.

[0101] The VCU will allocate the power to be consumed, which is determined based on the current power of the vehicle, to the motor controller. In order to prevent the motor controller from being unable to heat properly when the VCU sends a heating request, the VCU will first reserve the power to be consumed for subsequent heating functions, and then send a heating request to the motor controller.

[0102] The heating request is a heating command sent by the VCU to the motor controller, the purpose of which is to enable the motor controller to control the motor to use the power to be consumed to heat the battery water circuit according to the heating request;

[0103] After receiving the power to be consumed and the heating request, the motor controller converts the power to be consumed into heat by reducing the efficiency of the motor, applying pulses, or locking the rotor. This heats the battery water circuit, and the water flowing through the motor transfers the heat to the battery, thus achieving the effect of heating the battery.

[0104] In one embodiment, when the ambient temperature is less than or equal to a first ambient temperature during vehicle operation, after allocating the power to be consumed to the motor controller and sending a heating request to the motor controller, the method further includes:

[0105] Set the battery water pump opening to the first setting.

[0106] Control the water pump motor opening to the second opening degree;

[0107] The first opening is smaller than the second opening.

[0108] Optionally, the opening degree of the battery-powered water pump can be controlled at 60%, and the opening degree of the motor-driven water pump can be controlled at 30%.

[0109] Optionally, when the ambient temperature is less than or equal to the first ambient temperature, the vehicle speed is less than or equal to the first vehicle speed, or the vehicle speed is greater than the first vehicle speed but less than or equal to the second vehicle speed, and the battery SOC is greater than or equal to the first SOC but less than the third SOC, the battery water pump opening can be controlled only at the first opening, while the motor water pump opening can be 100% to increase the battery temperature as quickly as possible.

[0110] In one embodiment, after activating the function of heating the battery with the waste heat of the motor, it is also necessary to stop the function of heating the battery with the waste heat of the motor after the battery cell temperature or the water temperature at the battery water inlet meets certain conditions, in order to prevent the battery temperature from being too high and damaging the battery. Therefore, it also includes:

[0111] When the vehicle is charging, the battery is heated by the waste heat of the motor. When the ambient temperature, battery cell temperature, and battery water inlet temperature meet the corresponding conditions for stopping battery heating, a stop heating request is sent to the motor controller.

[0112] Optionally, during vehicle charging, after heating the battery with the waste heat of the motor, when the ambient temperature is less than or equal to the first ambient temperature, the battery cell temperature is greater than the second battery cell temperature, and the water temperature at the battery water inlet is greater than the second water temperature, or when the ambient temperature is greater than the first ambient temperature, the battery cell temperature is greater than the third battery cell temperature, and the water temperature at the battery water inlet is greater than the second water temperature, a heating stop request is sent to the motor controller.

[0113] When the vehicle is in operation, after the battery is heated by the residual heat of the motor, a stop heating request is sent to the motor controller when the water temperature at the battery water inlet meets the conditions for stopping battery heating, such as when the water temperature at the battery water inlet is greater than the fourth water temperature.

[0114] This invention, through different vehicle states, determines the ambient temperature and vehicle parameters. When the ambient temperature and vehicle parameters meet the conditions for heating the battery using the motor's waste heat, the waste heat is used to heat the battery. First, the corresponding power to be consumed is determined, and then this power is allocated to the motor controller so that the motor converts the power into heat, which heats the battery's cooling circuit. This improves the utilization rate of the motor's waste heat and reduces energy consumption. After raising the battery temperature, the battery's charging and discharging capacity is not limited, thereby improving the overall vehicle performance.

[0115] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0116] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0117] Figure 3 A schematic diagram of the battery heating control device provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0118] like Figure 3 As shown, the battery heating control device 3 includes: an acquisition module 31, a calculation module 32, and a processing module 33.

[0119] The acquisition module 31 is used to acquire vehicle driving status, ambient temperature and vehicle parameters;

[0120] The calculation module 32 is used to determine the corresponding power to be consumed when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with the waste heat of the motor under different vehicle conditions.

[0121] The processing module 33 is used to allocate the power to be consumed to the motor controller and send a heating request to the motor controller so that the motor can convert the power to be consumed into heat and heat the battery by heating the battery water circuit.

[0122] In one possible implementation, vehicle parameters include battery cell temperature and battery water inlet temperature.

[0123] Under different driving conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the calculation module 32 determines the corresponding power to be consumed and is used for:

[0124] During vehicle charging, when the ambient temperature and the battery cell temperature meet the corresponding conditions for heating the battery with waste heat from the motor, or when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

[0125] Among them, the temperature of the second battery cell is lower than that of the first battery cell, and the temperature of the third battery cell is greater than or equal to that of the first battery cell.

[0126] In one possible implementation, when the calculation module 32 determines the corresponding power to be consumed, it is used for:

[0127] Under vehicle charging conditions, obtain the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller;

[0128] The power to be consumed is determined based on the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller.

[0129] In one possible implementation, when the calculation module 32 determines the power to be consumed based on the current charging power, the currently permissible discharge power of the battery management system, and the power consumed by the accessory controller, it is used to:

[0130] According to P 待 =P 充 +P M -P 附 Determine the power to be consumed;

[0131] In the formula, P 待 P represents the power consumed when the motor's waste heat heats the battery during vehicle charging. 充 P represents the current charging power. M P represents the current allowable discharge power of the battery management system. 附This indicates the power consumption of the accessory controller.

[0132] In one possible implementation, vehicle parameters include battery cell temperature, battery water inlet temperature, vehicle speed, and battery SOC.

[0133] Under different driving conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the calculation module 32 determines the corresponding power to be consumed and is used for:

[0134] Under vehicle operating conditions, when the ambient temperature, the battery cell temperature, the vehicle speed, and the battery SOC meet the corresponding conditions for heating the battery with the waste heat of the motor, or when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with the waste heat of the motor, the corresponding power to be consumed is determined.

[0135] Among them, the second vehicle speed is less than the fourth vehicle speed, the first SOC is less than the second SOC, and the temperature of the fourth battery cell is less than the temperature of the fifth battery cell.

[0136] In one possible implementation, when the calculation module 32 determines the corresponding power to be consumed, it is used for:

[0137] Under vehicle operating conditions, obtain the current continuous discharge power of the battery management system and the power consumed by the accessory controller;

[0138] Based on different vehicle speeds and different battery SOCs, the corresponding power consumption parameters are determined. At the same vehicle speed, the higher the battery SOC, the higher the corresponding power consumption parameters.

[0139] The power to be consumed is determined based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters.

[0140] In one possible implementation, when the calculation module 32 determines the power to be consumed based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters, it is used for:

[0141] According to P 待 '=(P 持 -P 附 A determines the power to be consumed;

[0142] In the formula, P 待 'P' indicates the power consumed by the motor's waste heat to heat the battery during vehicle operation. 持 This indicates the current continuous discharge power of the battery management system, P. 附 This indicates the power consumption of the accessory controller, where A represents the power consumption parameter.

[0143] In one possible implementation, when the ambient temperature is less than or equal to a first ambient temperature during vehicle operation, after the calculation module 32 determines the power to be consumed, or after the processing module 33 allocates the power to be consumed to the motor controller and sends a heating request to the motor controller, the processing module 33 is further configured to:

[0144] Set the battery water pump opening to the first setting.

[0145] Control the water pump motor opening to the second opening degree;

[0146] The first opening is smaller than the second opening.

[0147] In one possible implementation, processing module 33 is further configured to:

[0148] When the vehicle is charging, the battery is heated by the waste heat of the motor. When the ambient temperature is less than or equal to the first ambient temperature, the battery cell temperature is greater than the second battery cell temperature, and the water temperature at the battery water inlet is greater than the second water temperature, or when the ambient temperature is greater than the first ambient temperature, the battery cell temperature is greater than the third battery cell temperature, and the water temperature at the battery water inlet is greater than the second water temperature, a heating stop request is sent to the motor controller.

[0149] When the vehicle is in operation, after the battery is heated by the residual heat of the motor, a heating stop request is sent to the motor controller when the water temperature at the battery water inlet exceeds the fourth water temperature.

[0150] The aforementioned battery heating control device determines the ambient temperature and vehicle parameters under different vehicle conditions. When the ambient temperature and vehicle parameters meet the conditions for heating the battery using the motor's waste heat, the waste heat from the motor is used to heat the battery. In this case, the calculation module first determines the corresponding power to be consumed, and then the processing module allocates the determined power to be consumed to the motor controller. The motor then converts this power into heat, which is used to heat the battery's cooling circuit, improving the utilization rate of the motor's waste heat and reducing energy consumption. After the battery temperature is increased, the battery's charging and discharging capacity is no longer limited, thereby improving the overall vehicle performance.

[0151] This invention also provides a vehicle, which includes a controller, such as a VCU. Figure 4 This is a schematic diagram of the controller provided in an embodiment of the present invention. Figure 4 As shown, the controller 4 in this embodiment includes a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, it implements the steps in the various battery heating control method embodiments described above, for example... Figure 1Steps 101 to 103 are shown. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 3 The functions of each module / unit are shown.

[0152] For example, the computer program 42 can be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the controller 4. For example, the computer program 42 can be divided into... Figure 3 The modules / units shown are shown.

[0153] The controller 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 4 This is merely an example of controller 4 and does not constitute a limitation on controller 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0154] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0155] The memory 41 can be an internal storage unit of the controller 4, such as a hard disk or memory of the controller 4. The memory 41 can also be an external storage device of the controller 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the controller 4. Furthermore, the memory 41 can include both internal storage units and external storage devices of the controller 4. The memory 41 is used to store the computer program and other programs and data required by the controller. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0156] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments 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. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0157] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0158] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0159] In the embodiments provided by this invention, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are merely illustrative. For instance, the division of modules or 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 devices or units may be electrical, mechanical, or other forms.

[0160] 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.

[0161] Furthermore, the functional units in the various embodiments of the present invention 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. The integrated unit can be implemented in hardware or as a software functional unit.

[0162] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various battery heating control method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0163] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method of battery heating, characterized by, include: The system acquires vehicle status, ambient temperature, and vehicle parameters, including battery cell temperature, vehicle speed, and battery SOC. Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined, including: Under vehicle operating conditions, when the ambient temperature, the battery cell temperature, the vehicle speed, and the battery SOC meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined. Determining the corresponding power to be consumed includes: Under vehicle operating conditions, obtain the current continuous discharge power of the battery management system and the power consumed by the accessory controller; Based on different vehicle speeds and different battery SOCs, the corresponding power consumption parameters are determined. At the same vehicle speed, the higher the battery SOC, the higher the corresponding power consumption parameters. The power to be consumed is determined based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters. Specifically, the power to be consumed is determined based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters, including: based on Determine the power to be consumed; where, This indicates the power consumed by the motor heating the battery under vehicle operating conditions. This indicates the current continuous discharge power of the battery management system. This indicates the power consumption of the accessory controller. Indicates power consumption parameters; The power to be consumed is allocated to the motor controller, and a heating request is sent to the motor controller so that the motor converts the power to be consumed into heat, which is used to heat the battery water circuit.

2. The battery heating control method according to claim 1, characterized in that, The vehicle parameters include battery cell temperature and battery water inlet temperature. Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined, including: During vehicle charging, when the ambient temperature and the battery cell temperature meet the corresponding conditions for heating the battery with waste heat from the motor, or when the ambient temperature and the water temperature at the battery water inlet meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

3. The battery heating control method according to claim 1, characterized in that, Determine the corresponding power to be consumed, including: Under vehicle charging conditions, obtain the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller; The power to be consumed is determined based on the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller.

4. The battery heating control method according to claim 3, characterized in that, Based on the current charging power, the current allowable discharge power of the battery management system, and the power consumed by the accessory controller, the power to be consumed by the motor is determined, including: according to Determine the power to be consumed; In the formula, This indicates the power consumed when the motor's waste heat heats the battery during vehicle charging. Indicates the current charging power. This indicates the current allowable discharge power of the battery management system. This indicates the power consumption of the accessory controller.

5. The battery heating control method according to claim 1, characterized in that, The vehicle parameters also include the water temperature at the battery water inlet. Under different vehicle conditions, when the ambient temperature and vehicle parameters meet the corresponding conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined, including: When the ambient temperature and the water temperature at the battery water inlet meet the conditions for heating the battery with waste heat from the motor, the corresponding power to be consumed is determined.

6. The battery heating control method according to claim 5, characterized in that, When the ambient temperature is less than or equal to a first ambient temperature during vehicle operation, after determining the corresponding power to be consumed, or after allocating the power to be consumed to the motor controller and sending a heating request to the motor controller, the method further includes: Set the battery water pump opening to the first setting. Control the water pump motor opening to the second opening degree; The first opening is smaller than the second opening.

7. The battery heating control method according to claim 1, characterized in that, Also includes: When the vehicle is charging, the battery is heated by the waste heat of the motor. When the ambient temperature, battery cell temperature and battery water inlet temperature meet the corresponding conditions for stopping battery heating, a stop heating request is sent to the motor controller. When the vehicle is in operation, after the battery is heated by the residual heat of the motor, a stop heating request is sent to the motor controller when the water temperature at the battery water inlet meets the conditions for stopping battery heating.

8. A control device for battery heating, characterized in that, include: The acquisition module is used to acquire vehicle driving status, ambient temperature, and vehicle parameters; the vehicle parameters include battery cell temperature, vehicle speed, and battery SOC. The calculation module is used to determine the corresponding power to be consumed when the ambient temperature and the vehicle parameters meet the corresponding conditions for heating the battery with the waste heat of the motor under different vehicle conditions. The calculation module is used to determine the corresponding power to be consumed when the ambient temperature, the battery cell temperature, the vehicle speed, and the battery SOC meet the corresponding conditions for heating the battery with the waste heat of the motor under vehicle operating conditions. When the calculation module determines the corresponding power to be consumed, it is used for: Under vehicle operating conditions, obtain the current continuous discharge power of the battery management system and the power consumed by the accessory controller; Based on different vehicle speeds and different battery SOCs, the corresponding power consumption parameters are determined. At the same vehicle speed, the higher the battery SOC, the higher the corresponding power consumption parameters. The power to be consumed is determined based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters. The calculation module, when determining the power to be consumed based on the current continuous discharge power of the battery management system, the power consumed by the accessory controller, and the corresponding power consumption parameters, is used to: Determine the power to be consumed; where, This indicates the power consumed by the motor heating the battery under vehicle operating conditions. This indicates the current continuous discharge power of the battery management system. This indicates the power consumption of the accessory controller. Indicates power consumption parameters; The processing module is used to allocate the power to be consumed to the motor controller and send a heating request to the motor controller so that the motor can convert the power to be consumed into heat and heat the battery by heating the battery water circuit.

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