Method and device for controlling the temperature of a vehicle battery

Abstract

The present application relates to a method for controlling temperature of a vehicle battery, a device for controlling temperature of a vehicle battery, a computer storage medium and a computer device. According to one aspect of the present application, a method for controlling temperature of a vehicle battery is provided, which comprises the following steps: detecting battery temperature and vehicle state; enabling a battery temperature maintenance operation in response to the detected battery temperature and vehicle state satisfying a first preset condition, the battery temperature maintenance operation comprising controlling the battery to switch between a charging state and a discharging state by adjusting an output voltage of a DCDC converter; and disabling the battery temperature maintenance operation in response to the detected battery temperature and a battery SOC value satisfying a second preset condition.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically to a method for controlling the temperature of a vehicle battery, an apparatus for controlling the temperature of a vehicle battery, a computer storage medium, and a computer device. Background Technology

[0002] With the continuous development of the electric vehicle industry, batteries play an irreplaceable role as the power source for electric vehicles. However, batteries are easily affected by the environment during use, especially in low ambient temperatures, where their capacity and performance cannot reach the ideal level.

[0003] Currently, most electric vehicles use lithium iron phosphate (LFP) batteries. LFP batteries have advantages such as large capacity, high power density, and high cost-effectiveness. However, the charging and discharging performance of this type of battery is significantly affected by temperature, especially in low-temperature environments (typically below -30°C), where the battery's charging capacity will decrease significantly. If the battery's state of charge (SOC) is too low at this time, the battery will be in a discharged state, which will greatly affect the vehicle's starting in low-temperature environments, and may even make it difficult to start the vehicle. Summary of the Invention

[0004] To address or at least alleviate one or more of the above problems, the following technical solutions are provided.

[0005] According to a first aspect of the present invention, a method for controlling the temperature of a vehicle battery is provided, the method comprising the steps of: detecting a battery temperature and a vehicle status; activating a battery insulation operation in response to the detected battery temperature and vehicle status meeting a first preset condition, the battery insulation operation including controlling the battery to switch between a charging state and a discharging state by adjusting the output voltage of a DC-DC converter; and deactivating the battery insulation operation in response to the detected battery temperature and battery SOC value meeting a second preset condition.

[0006] According to an embodiment of the present invention, a method for controlling the temperature of a vehicle battery includes detecting the battery temperature periodically at predetermined time intervals; and estimating the moment when the current battery temperature drops to the insulation activation temperature based on the current battery temperature and the ambient temperature, and detecting the battery temperature at said moment.

[0007] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery includes detecting one or more of the following items when the detected battery temperature is lower than the insulation start temperature: vehicle usage status, DC-DC converter operating status, and the operating status of actuators and sensors associated with the battery insulation operation.

[0008] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery, wherein the detected battery temperature and the vehicle status satisfy a first preset condition includes: the detected battery temperature is lower than the insulation activation temperature; the vehicle is in a parked state and there are no occupants in the vehicle; and the DC-DC converter and the actuators and sensors associated with the battery insulation operation are in normal working condition.

[0009] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery further includes: comparing a battery SOC value with a discharge heat preservation threshold, wherein the discharge heat preservation threshold indicates the safety of performing a charge-discharge operation at the battery SOC value; entering a discharge state in response to the battery SOC value being greater than the discharge heat preservation threshold; and entering a charging state in response to the battery SOC value being less than or equal to the discharge heat preservation threshold.

[0010] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery, wherein in the discharge state: the output voltage of the DC-DC converter is adjusted to be less than the open-circuit voltage of the battery; the power of the low-voltage load of the vehicle is selectively increased; and the heat generated by the discharge current is used to heat the vehicle battery.

[0011] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery, wherein in the charging state: the output voltage of the DC-DC converter is adjusted to be greater than the open-circuit voltage of the battery to charge the vehicle battery.

[0012] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery further includes: in the discharge state, entering the charging state in response to one or more of the following: the battery temperature being greater than or equal to a preset insulation temperature, the battery SOC value being less than or equal to the discharge insulation threshold, and the discharge depth being greater than or equal to a depth threshold; and in the charging state, entering the discharge state in response to the battery temperature being less than the preset insulation temperature, the battery SOC value being greater than the discharge insulation threshold, and the battery temperature rise rate being less than a preset rate.

[0013] According to one embodiment or any of the above embodiments of the present invention, the method for controlling the temperature of a vehicle battery, wherein the detected battery temperature and battery SOC value satisfying a second preset condition includes: the detected battery temperature being greater than or equal to a preset insulation temperature; and the battery SOC value being greater than or equal to a battery dormancy threshold, wherein the battery dormancy threshold indicates a fully charged or nearly fully charged state of the battery.

[0014] According to a second aspect of the invention, an apparatus for controlling the temperature of a vehicle battery is provided, the apparatus comprising: a detection unit configured to detect battery temperature and vehicle status; and a control unit configured to: activate a battery insulation operation in response to the detected battery temperature and vehicle status meeting a first preset condition, the battery insulation operation including controlling the battery to switch between a charging state and a discharging state by adjusting the output voltage of a DC-DC converter; and deactivate the battery insulation operation in response to the detected battery temperature and battery SOC value meeting a second preset condition.

[0015] According to an embodiment of the present invention, the device for controlling the temperature of a vehicle battery, wherein the detection unit is further configured to: periodically detect the battery temperature at predetermined time intervals; and estimate, based on the current battery temperature and the ambient temperature, the moment when the current battery temperature drops to the heat preservation activation temperature, and detect the battery temperature at said moment.

[0016] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the detection unit is further configured to detect one or more of the following items when the detected battery temperature is lower than the insulation start temperature: vehicle usage status, DC-DC converter operating status, and operating status of actuators and sensors associated with the battery insulation operation.

[0017] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the detected battery temperature and the overall vehicle status satisfy a first preset condition including: the detected battery temperature is lower than the insulation activation temperature; the vehicle is in a parked state and there are no occupants in the vehicle; and the DC-DC converter and the actuators and sensors associated with the battery insulation operation are in normal working condition.

[0018] According to one or more embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the control unit is further configured to: compare a battery SOC value with a discharge insulation threshold, wherein the discharge insulation threshold indicates the safety of performing charge and discharge operations at the battery SOC value; control the battery to enter a discharge state in response to the battery SOC value being greater than the discharge insulation threshold; and control the battery to enter a charging state in response to the battery SOC value being less than or equal to the discharge insulation threshold.

[0019] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the control unit is further configured in the discharge state to: adjust the output voltage of the DC-DC converter to be less than the open-circuit voltage of the battery; selectively increase the power of the vehicle's low-voltage load; and use the heat generated by the discharge current to heat the vehicle battery.

[0020] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the control unit is further configured in the charging state to: adjust the output voltage of the DC-DC converter to be greater than the open-circuit voltage of the battery in order to charge the vehicle battery.

[0021] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the control unit is further configured to: in the discharge state, control the battery to enter the charging state in response to one or more of the following: the battery temperature is greater than or equal to a preset insulation temperature, the battery SOC value is less than or equal to the discharge insulation threshold, and the discharge depth is greater than or equal to a depth threshold; and in the charging state, control the battery to enter the discharge state in response to the battery temperature being less than the preset insulation temperature, the battery SOC value being greater than the discharge insulation threshold, and the battery temperature rise rate being less than a preset rate.

[0022] According to one embodiment or any of the above embodiments of the present invention, the device for controlling the temperature of a vehicle battery, wherein the detected battery temperature and battery SOC value satisfy a second preset condition including: the detected battery temperature is greater than or equal to a preset insulation temperature; and the battery SOC value is greater than or equal to a battery dormancy threshold, wherein the battery dormancy threshold indicates a fully charged or nearly fully charged state of the battery.

[0023] According to a third aspect of the present invention, a computer storage medium is provided, the computer storage medium including instructions that, when executed, perform the steps of the method for controlling the temperature of a vehicle battery according to a first aspect of the present invention.

[0024] According to a fourth aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the steps of the method for controlling the temperature of a vehicle battery according to a first aspect of the present invention.

[0025] The method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention can maintain the temperature of the battery by utilizing the self-heating during battery discharge, thereby achieving temperature control of the vehicle battery without increasing hardware costs. This ensures that the battery operates at a suitable temperature, preventing the vehicle from being difficult to start due to excessively low temperatures. Furthermore, temperature control of the vehicle battery can extend battery life and improve the accuracy of estimating the battery's State of Charge (SOC). Attached Figure Description

[0026] The above and / or other aspects and advantages of the present invention will become clearer and more readily understood from the following description taken in conjunction with the accompanying drawings, in which the same or similar elements are denoted by the same reference numerals. In the drawings:

[0027] Figure 1 This is a flowchart of a method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0028] Figure 2 This is a flowchart of a method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0029] Figure 3 This is a block diagram of an apparatus for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0030] Figure 4 Block diagram of a computer device according to an embodiment of the present invention. Detailed Implementation

[0031] The following detailed description is merely exemplary in nature and is not intended to limit the disclosed technology or its application and use. Furthermore, it is not intended to be bound by any express or implied theory presented in the foregoing technical fields, background art, or the following detailed description.

[0032] In the following detailed description of the embodiments, numerous specific details are set forth in order to provide a more thorough understanding of the disclosed technology. However, it will be apparent to those skilled in the art that the disclosed technology can be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid unnecessarily complicating the description.

[0033] Terms such as "comprising" and "including" indicate that, in addition to the units and steps that are directly and explicitly stated in the specification, the technical solution of the present invention does not exclude the presence of other units and steps that are not directly or explicitly stated. Terms such as "first" and "second" do not indicate the order of the units in terms of time, space, size, etc., but are merely used to distinguish the units.

[0034] In the context of this invention, the battery SOC (State of Charge) value can be used to represent the ratio of the remaining battery capacity to the total battery capacity, thereby reflecting the remaining battery capacity. It can be understood that the SOC value ranges from 0% to 100%. For example, when SOC = 0%, it means the remaining battery capacity is 0, i.e., the battery is fully discharged; when SOC = 100%, it means the remaining battery capacity is 1, i.e., the battery is fully charged; and when SOC = 50%, it means the remaining battery capacity is 0.5.

[0035] In the following, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0036] Figure 1 This is a flowchart of a method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0037] like Figure 1 As shown, in step S101, the battery temperature and the vehicle status are detected. To achieve real-time monitoring of the battery temperature, the battery temperature can be detected periodically at predetermined time intervals, or at specific moments determined based on the current battery temperature, ambient temperature, and the insulation activation temperature. It is understood that the insulation activation temperature represents the temperature at which battery insulation operation needs to be activated.

[0038] Optionally, in step S101, the battery temperature can be detected using the battery controller. Optionally, the battery controller can be periodically woken up at predetermined time intervals to detect the battery temperature. Alternatively, the time when the battery temperature drops to the insulation activation temperature can be estimated based on the battery temperature before the battery controller goes into sleep mode and the ambient temperature, and the battery controller can be woken up at that time to detect the battery temperature. Detecting the battery temperature using these two methods avoids the problem of the battery temperature not being detectable due to the battery controller going into sleep mode, thereby achieving accurate identification of the need for battery insulation operations. It should be noted that other units or components in the vehicle can also be used to detect the battery temperature.

[0039] Optionally, in step S101, the vehicle status can be detected when the detected battery temperature is lower than the insulation start temperature. For example, the vehicle status may include, but is not limited to, the vehicle's usage status (e.g., whether the vehicle is driving or parked, whether there are occupants in the vehicle), the operating status of the DC-DC converter, and the operating status of actuators and sensors associated with the battery insulation operation. Optionally, the vehicle status can be detected using the vehicle controller. When the detected battery temperature is lower than the insulation start temperature, the vehicle controller can be woken up to detect the vehicle status. When the detected vehicle status does not meet specific conditions, such as when the vehicle is in motion or when there are occupants in the vehicle, the vehicle controller can re-enter a sleep state. It should be noted that other units or components in the vehicle can also be used to detect the vehicle status. By detecting the vehicle status, the normal operation of the battery insulation operation and the safety of the vehicle's occupants can be ensured.

[0040] When the detected battery temperature and vehicle status meet the first preset conditions, proceed to step S103 to enable battery insulation operation. Optionally, meeting the first preset conditions may include the detected battery temperature being lower than the insulation activation temperature, the vehicle being parked and there being no occupants in the vehicle, and the DC-DC converter and the actuators and sensors associated with the battery insulation operation being in normal working condition.

[0041] In step S103, the battery insulation operation is enabled, which includes controlling the battery to switch between charging and discharging states by adjusting the output voltage of the DC-DC converter.

[0042] Optionally, in step S103, the battery's initial state (SOC) or initial state (discharge) can be determined based on the battery's SOC value. In one embodiment, the battery's SOC value can be compared with a discharge insulation threshold, and the comparison result can be used to determine whether the battery first enters a charging or discharging state. When the battery's SOC value is greater than the discharge insulation threshold, it first enters a discharging state; and when the battery's SOC value is less than or equal to the discharge insulation threshold, it first enters a charging state. It should be noted that the discharge insulation threshold indicates the safety of performing charge and discharge operations on the battery at the current battery SOC value. For example, when the battery's SOC value is 10%, comparing the battery's SOC value with the discharge insulation threshold determines that it is safe for the battery to enter a charging state; and when the battery's SOC value is 70%, comparing the battery's SOC value with the discharge insulation threshold determines that it is safe for the battery to enter a discharging state.

[0043] Optionally, in step S103, when it is determined that the battery first enters a discharge state, the output voltage of the DC-DC converter can be adjusted to be lower than the open-circuit voltage of the battery, selectively increasing the power of the vehicle's low-voltage load, and utilizing the heat generated by the discharge current to heat the vehicle battery. In one embodiment, when the power of the vehicle's low-voltage load is low, the power of a portion of the low-voltage load can be selectively increased to maximize the battery discharge current while ensuring battery safety and lifespan, thereby improving the heating efficiency of the vehicle battery. Exemplarily, the vehicle's low-voltage load may include, but is not limited to, water pumps, fans, blowers, air conditioners, heating elements for heating seats and steering wheels, etc.

[0044] Optionally, in step S103, when it is determined that the battery first enters the charging state, the output voltage of the DC-DC converter can be adjusted to be greater than the open-circuit voltage of the battery in order to charge the vehicle battery.

[0045] Optionally, in step S103, the battery can be switched between a charging state and a discharging state based on one or more preset conditions for the battery state. In one embodiment, when the battery is in a discharging state, the battery can be switched from a discharging state to a charging state when one or more of the following conditions are met: the battery temperature is greater than or equal to a preset insulation temperature, the battery SOC value is less than or equal to a discharge insulation threshold, and the depth of discharge is greater than or equal to a depth threshold. In one embodiment, when the battery is in a charging state, the battery can be switched from a charging state to a discharging state when the following conditions are met simultaneously: the battery temperature is less than a preset insulation temperature, the battery SOC value is greater than a discharge insulation threshold, and the battery temperature rise rate is less than a preset rate.

[0046] In step S105, the battery insulation operation is disabled in response to the detection of the battery temperature and battery SOC value meeting the second preset condition.

[0047] Optionally, in step S105, the detection of the battery temperature and battery SOC value satisfying the second preset condition may include the detected battery temperature being greater than or equal to a preset insulation temperature and the battery SOC value being greater than or equal to a battery dormancy threshold, wherein the battery dormancy threshold indicates that the battery is fully charged or nearly fully charged. For example, the battery dormancy threshold may be set to 90%-100%.

[0048] According to one or more embodiments of the present invention, the risk of battery depletion at low temperatures can be accurately and timely identified. By actively intervening in the output voltage of the DC-DC converter, the charging and discharging state of the battery can be indirectly controlled. The self-heating of the battery during discharge is utilized for heat preservation control, thereby ensuring that the minimum battery temperature remains above the lower charging temperature limit during vehicle parking, preventing the vehicle from being difficult to start due to battery depletion at low temperatures. Furthermore, according to one or more embodiments of the present invention, the proportion of battery usage in low-temperature environments can be reduced, which is beneficial for extending the battery's service life.

[0049] Figure 2 This is a flowchart of a method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0050] like Figure 2 As shown, in step S201, when the vehicle is parked in an ultra-low temperature environment (e.g., below -30°C) for a predetermined period of time, the battery controller is woken up to detect the battery temperature. Optionally, the battery controller can be woken up periodically at predetermined time intervals to detect the battery temperature, or the moment when the battery temperature drops to the insulation activation temperature can be estimated based on the battery temperature and ambient temperature before the battery controller goes into sleep mode, and the battery controller is woken up at said moment to detect the battery temperature.

[0051] In step S202, the detected battery temperature is compared with the heat preservation start temperature to determine whether the detected battery temperature is lower than the heat preservation start temperature.

[0052] When the detected battery temperature is not lower than the insulation activation temperature, proceed to step S203 to calculate the estimated time for the detected battery temperature to drop to the insulation activation temperature based on the detected battery temperature and ambient temperature. Record the estimated temperature drop time and cause the battery controller to re-enter sleep mode. After the estimated temperature drop time has elapsed, the battery controller can be reawakened to detect the battery temperature.

[0053] When the detected battery temperature is lower than the insulation activation temperature, step S204 is entered to wake up the vehicle controller to request the activation of battery insulation operation and to detect the vehicle status.

[0054] In step S205, the awakened vehicle controller detects the vehicle status and determines whether the detected vehicle status meets specific conditions. For example, the vehicle status may include, but is not limited to, the vehicle usage status (e.g., vehicle driving or parking status, whether there are occupants in the vehicle, etc.), the operating status of the DC-DC converter, and the operating status of actuators and sensors associated with battery insulation operations.

[0055] In step S205, when the detected vehicle status meets specific conditions, the process proceeds to step S206 to enable battery insulation operation. When the detected vehicle status does not meet specific conditions, the process proceeds to step S213 to deactivate the insulation function and cause the vehicle controller to re-enter sleep mode. Optionally, the specific conditions for the detected vehicle status to meet may include the vehicle being parked, the absence of occupants in the vehicle, and the DC-DC converter and actuators and sensors associated with the battery insulation operation being in normal working condition. It should be noted that the battery insulation operation includes... Figure 2 One or more of steps S206 to S212 shown.

[0056] In step S206, the battery SOC value is compared with the discharge heat preservation threshold, and based on the comparison result, it is determined whether the battery first enters the charging state or the discharging state. When the battery SOC value is higher than the discharge heat preservation threshold, the battery enters the discharging state in step S207, and when the battery SOC value is not higher than the discharge heat preservation threshold, the battery enters the charging state in step S210.

[0057] After entering the discharge state in step S207, the output voltage of the DC-DC converter can be adjusted to be less than the open-circuit voltage of the battery, selectively increasing the power of the vehicle's low-voltage load, and using the heat generated by the discharge current to heat the vehicle's battery.

[0058] After entering the charging state in step S210, the output voltage of the DC-DC converter can be adjusted to be greater than the open-circuit voltage of the battery in order to charge the vehicle battery.

[0059] Continue as Figure 2 As shown, the battery can also be switched between charging and discharging states based on the judgments of conditions 1 and 2 shown in steps S208 and S211, respectively. Optionally, condition 1 may include any combination of one or more of the following: battery temperature greater than or equal to a preset insulation temperature, battery SOC value less than or equal to a discharge insulation threshold, and discharge depth greater than or equal to a depth threshold. Condition 2 may include battery temperature less than the preset insulation temperature, battery SOC value greater than the discharge insulation threshold, and battery temperature rise rate less than a preset rate.

[0060] In step S208, if condition 1 is met, the battery can be switched from the discharging state to the charging state; otherwise, proceed to step S209. In step S211, if condition 2 is met, the battery can be switched from the charging state to the discharging state; otherwise, proceed to step S212.

[0061] Continue as Figure 2As shown, the decision to exit the heat preservation function can also be based on the judgment of condition 3 shown in steps S209 and S212, respectively. Optionally, condition 3 may include the detected battery temperature being greater than or equal to a preset heat preservation temperature and the battery SOC value being greater than or equal to a battery sleep threshold, wherein the battery sleep threshold indicates that the battery is fully charged or nearly fully charged. For example, the battery sleep threshold may be set to 90%-100%.

[0062] In step S209, if condition 3 is met, step S213 can be entered to exit the heat preservation function and allow the vehicle controller to re-enter the sleep state; otherwise, the process returns to the discharge state in step S207.

[0063] In step S212, if condition 3 is met, the process can proceed to step S213 to exit the heat preservation function and allow the vehicle controller to re-enter the sleep state; otherwise, it returns to the charging state in step S210.

[0064] Optionally, in step S213, the estimated time for the current battery temperature to drop to the insulation activation temperature can be calculated based on the current battery temperature and ambient temperature. This estimated time is recorded, and the battery controller re-enters sleep mode. After the estimated time has elapsed, the battery controller can be reawakened to detect the battery temperature.

[0065] The method for controlling the temperature of a vehicle battery according to one aspect of the present invention can maintain the temperature of the battery by utilizing the self-heating during battery discharge, thereby achieving temperature control of the vehicle battery without increasing hardware costs. This ensures that the battery operates at a suitable temperature, preventing the vehicle from being difficult to start due to excessively low temperatures. Furthermore, temperature control of the vehicle battery can extend battery life and improve the accuracy of estimating the battery's state of charge (SOC).

[0066] Figure 3 This is a block diagram of an apparatus for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0067] like Figure 3 As shown, the device 300 for controlling the temperature of a vehicle battery includes a detection unit 310 and a control unit 320.

[0068] The detection unit 310 can be configured to detect battery temperature and vehicle status. In order to achieve real-time monitoring of battery temperature, the detection unit 310 can be configured to periodically detect battery temperature at predetermined time intervals, and to detect battery temperature at specific times determined based on the current battery temperature, ambient temperature and insulation start temperature.

[0069] Optionally, the detection unit 310 may include a battery controller. Optionally, the battery controller can be periodically woken up at predetermined time intervals to detect the battery temperature. Alternatively, it can estimate the time when the battery temperature drops to the insulation activation temperature based on the battery temperature and ambient temperature before the battery controller goes into sleep mode, and wake up the battery controller at that time to detect the battery temperature. By detecting the battery temperature in these two ways, the problem of undetectable battery temperature due to the battery controller going into sleep mode is avoided, thereby achieving accurate identification of the need for battery insulation operations.

[0070] Optionally, the detection unit 310 can be configured to detect the vehicle status when the detected battery temperature is lower than the insulation start temperature. Exemplarily, the vehicle status may include, but is not limited to, the vehicle's usage status (e.g., whether the vehicle is in motion or parked, whether there are occupants in the vehicle), the operating status of the DC-DC converter, and the operating status of actuators and sensors associated with the battery insulation operation. Optionally, the detection unit 310 may also include a vehicle controller. When the detected battery temperature is lower than the insulation start temperature, the vehicle controller can be woken up to detect the vehicle status. When the detected vehicle status does not meet specific conditions, such as when the vehicle is in motion or when there are occupants in the vehicle, the vehicle controller can re-enter a sleep state. By detecting the vehicle status, the normal operation of the battery insulation operation and the safety of the vehicle occupants can be ensured.

[0071] The control unit 320 can be configured to activate battery insulation operation when the detected battery temperature and vehicle status meet a first preset condition. Optionally, meeting the first preset condition may include the detected battery temperature being lower than the insulation activation temperature, the vehicle being parked and there being no occupants in the vehicle, and the DC-DC converter and the actuators and sensors associated with the battery insulation operation being in normal working condition. Activating the battery insulation operation may include controlling the battery to switch between charging and discharging states by adjusting the output voltage of the DC-DC converter.

[0072] Optionally, the control unit 320 can be configured to determine whether the battery first enters a charging state or a discharging state based on the battery's SOC value. In one embodiment, the control unit 320 can be configured to determine whether the battery first enters a charging state or a discharging state by comparing the battery's SOC value with a discharge insulation threshold. When the battery's SOC value is greater than the discharge insulation threshold, the control unit 320 can control the battery to first enter a discharging state, and when the battery's SOC value is less than or equal to the discharge insulation threshold, the control unit 320 can control the battery to first enter a charging state.

[0073] Optionally, the control unit 320 can be configured to adjust the output voltage of the DC-DC converter to be lower than the open-circuit voltage of the battery when it is determined that the battery first enters a discharge state, selectively increase the power of the vehicle's low-voltage load, and utilize the heat generated by the discharge current to heat the vehicle battery. In one embodiment, when the power of the vehicle's low-voltage load is low, the control unit 320 can be configured to selectively increase the power of a portion of the low-voltage load to maximize the battery discharge current while ensuring battery safety and lifespan, thereby improving the heating efficiency of the vehicle battery.

[0074] Optionally, the control unit 320 can be configured to adjust the output voltage of the DC-DC converter to be greater than the open-circuit voltage of the battery when it is determined that the battery first enters the charging state, so as to charge the vehicle battery.

[0075] Optionally, the control unit 320 can be configured to switch the battery between a charging state and a discharging state based on one or more preset conditions for the battery state. In one embodiment, when the battery is in a discharging state, the control unit 320 can be configured to switch the battery from a discharging state to a charging state when one or more of the following conditions are met: the battery temperature is greater than or equal to a preset insulation temperature, the battery SOC value is less than or equal to a discharge insulation threshold, and the depth of discharge is greater than or equal to a depth threshold. In one embodiment, when the battery is in a charging state, the control unit 320 can be configured to switch the battery from a charging state to a discharging state when the following conditions are met simultaneously: the battery temperature is less than a preset insulation temperature, the battery SOC value is greater than a discharge insulation threshold, and the battery temperature rise rate is less than a preset rate.

[0076] The control unit 320 can also be configured to disable battery insulation operation in response to the detected battery temperature and battery SOC value meeting a second preset condition. Optionally, the detected battery temperature and battery SOC value meeting the second preset condition may include the detected battery temperature being greater than or equal to a preset insulation temperature and the battery SOC value being greater than or equal to a battery sleep threshold, wherein the battery sleep threshold indicates that the battery is fully charged or nearly fully charged. For example, the battery sleep threshold may be set to 90%-100%.

[0077] According to one aspect of the present invention, a device for controlling the temperature of a vehicle battery can maintain its temperature through the self-heating generated during battery discharge, thereby achieving temperature control of the vehicle battery without increasing hardware costs. This ensures that the battery operates at a suitable temperature, preventing the vehicle from being difficult to start due to excessively low temperatures. Furthermore, temperature control of the vehicle battery can extend battery life and improve the accuracy of estimating the battery's state of charge (SOC).

[0078] Figure 4 This is a block diagram of a computer device according to an embodiment of the present invention. Figure 4 As shown, the computer device 400 includes a memory 410, a processor 420, and a computer program 430 stored in the memory 410 and executable on the processor 420. When the processor 420 executes the computer program 430, it implements various steps of a method for controlling the temperature of a vehicle battery according to one or more embodiments of the present invention.

[0079] Additionally, as described above, the present invention can also be implemented as a computer storage medium storing a program for causing a computer to execute a method for controlling the temperature of a vehicle battery according to one aspect of the present invention.

[0080] Here, computer storage media can be various types, such as disks (e.g., hard disks, optical disks, etc.), cards (e.g., memory cards, optical cards, etc.), semiconductor memory (e.g., ROM, non-volatile memory, etc.), and tapes (e.g., magnetic tape, cassette tape, etc.).

[0081] Where applicable, the various embodiments provided by the present invention may be implemented using hardware, software, or a combination of hardware and software. Furthermore, where applicable, without departing from the scope of the invention, the various hardware and / or software components described herein may be combined into composite components comprising software, hardware, and / or both. Where applicable, without departing from the scope of the invention, the various hardware and / or software components described herein may be divided into sub-components comprising software, hardware, or both. Additionally, where applicable, it is contemplated that software components may be implemented as hardware components, and vice versa.

[0082] The software (such as program code and / or data) according to the invention can be stored on one or more computer storage media. It is also contemplated that the software identified herein can be implemented using one or more networked and / or otherwise general-purpose or special-purpose computers and / or computer systems. Where applicable, the order of the various steps described herein can be changed, combined into compound steps, and / or divided into sub-steps to provide the features described herein.

[0083] The embodiments and examples presented herein are provided to best illustrate embodiments of the invention and its particular applications, thereby enabling those skilled in the art to practice and use the invention. However, those skilled in the art will understand that the above description and examples are provided merely for ease of illustration and example. The descriptions presented are not intended to cover all aspects of the invention or to limit the invention to the precise forms disclosed.

Claims

1. A method for controlling the temperature of a vehicle battery, characterized in that, The method includes the following steps: Detecting battery temperature and overall vehicle status, including whether the vehicle is in motion or parked, and whether there are occupants inside the vehicle, wherein detecting battery temperature includes: The battery temperature is periodically detected at predetermined time intervals; and Based on the current battery temperature and ambient temperature, the estimated time when the current battery temperature drops to the insulation activation temperature is determined, and the battery temperature is detected at that time; The battery insulation operation is activated in response to the detected battery temperature and vehicle status meeting a first preset condition. The battery insulation operation includes controlling the battery to switch between charging and discharging states by adjusting the output voltage of the DC-DC converter. The detected battery temperature and vehicle status meeting the first preset condition includes: The detected battery temperature is lower than the insulation activation temperature; The vehicle is parked and there are no occupants inside; and The DC-DC converter, as well as the actuators and sensors associated with the battery insulation operation, are in normal working condition; and The battery insulation operation is deactivated in response to the detected battery temperature and battery SOC value meeting a second preset condition, wherein the detected battery temperature and battery SOC value meeting the second preset condition includes: The detected battery temperature is greater than or equal to the preset insulation temperature; and The battery SOC value is greater than or equal to the battery dormancy threshold, wherein the battery dormancy threshold indicates that the battery is fully charged or nearly fully charged.

2. The method of claim 1, wherein detecting the vehicle status includes detecting one or more of the following items when the detected battery temperature is lower than the insulation start temperature: vehicle usage status, DC-DC converter operating status, and the operating status of actuators and sensors associated with the battery insulation operation.

3. The method according to claim 1, wherein the battery heat preservation operation further includes: Compare the battery SOC value with a discharge insulation threshold, wherein the discharge insulation threshold indicates the safety of performing charge and discharge operations at the battery SOC value; The battery enters a discharge state in response to the SOC value of the battery being greater than the discharge heat preservation threshold. as well as The battery enters a charging state in response to the battery SOC value being less than or equal to the discharge heat preservation threshold.

4. The method according to claim 1, wherein in the discharge state: The output voltage of the DC-DC converter is adjusted to be lower than the open-circuit voltage of the battery. Selectively increase the power of the vehicle's low-voltage load; and The heat generated by the discharge current is used to heat the vehicle battery.

5. The method of claim 1, wherein in the charging state: The output voltage of the DC-DC converter is adjusted to be greater than the open-circuit voltage of the battery in order to charge the vehicle battery.

6. The method of claim 3, wherein the method further comprises: In the discharge state, the charging state is entered in response to one or more of the following: the battery temperature is greater than or equal to the preset heat preservation temperature, the battery SOC value is less than or equal to the discharge heat preservation threshold, and the discharge depth is greater than or equal to the depth threshold. as well as In the charging state, the battery enters the discharging state in response to the battery temperature being lower than the preset heat preservation temperature, the battery SOC value being greater than the discharge heat preservation threshold, and the battery temperature rise rate being less than the preset rate.

7. A device for controlling the temperature of a vehicle battery, characterized in that, The device includes: A detection unit is configured to detect battery temperature and vehicle status, wherein the vehicle status includes whether the vehicle is in motion or parked, and whether there are occupants inside the vehicle. The detection unit is further configured to: The battery temperature is periodically detected at predetermined time intervals; and Based on the current battery temperature and ambient temperature, the estimated time when the current battery temperature drops to the insulation activation temperature is determined, and the battery temperature is detected at that time; and The control unit is configured as follows: The battery insulation operation is activated in response to the detected battery temperature and vehicle status meeting a first preset condition. The battery insulation operation includes controlling the battery to switch between charging and discharging states by adjusting the output voltage of the DC-DC converter. The detected battery temperature and vehicle status meeting the first preset condition includes: The detected battery temperature is lower than the insulation activation temperature; The vehicle is parked and there are no occupants inside; and The DC-DC converter, as well as the actuators and sensors associated with the battery insulation operation, are in normal working condition; and The battery insulation operation is deactivated in response to the detected battery temperature and battery SOC value meeting a second preset condition, wherein the detected battery temperature and battery SOC value meeting the second preset condition includes: The detected battery temperature is greater than or equal to the preset insulation temperature; and The battery SOC value is greater than or equal to the battery dormancy threshold, wherein the battery dormancy threshold indicates that the battery is fully charged or nearly fully charged.

8. The apparatus of claim 7, wherein the detection unit is further configured to detect one or more of the following when the detected battery temperature is below the insulation start temperature: vehicle usage status, DC-DC converter operating status, and the operating status of actuators and sensors associated with the battery insulation operation.

9. The apparatus of claim 7, wherein the control unit is further configured to: Compare the battery SOC value with a discharge insulation threshold, wherein the discharge insulation threshold indicates the safety of performing charge and discharge operations at the battery SOC value; In response to the battery's SOC value exceeding the discharge insulation threshold, the battery is controlled to enter a discharge state; and The battery is controlled to enter a charging state in response to the battery SOC value being less than or equal to the discharge heat preservation threshold.

10. The apparatus of claim 7, wherein the control unit is further configured in the discharge state to: The output voltage of the DC-DC converter is adjusted to be lower than the open-circuit voltage of the battery. Selectively increase the power of the vehicle's low-voltage load; and The heat generated by the discharge current is used to heat the vehicle battery.

11. The apparatus of claim 7, wherein the control unit is further configured in the charging state to: The output voltage of the DC-DC converter is adjusted to be greater than the open-circuit voltage of the battery in order to charge the vehicle battery.

12. The apparatus of claim 9, wherein the control unit is further configured to: In the discharge state, the battery is controlled to enter the charging state in response to one or more of the following: battery temperature is greater than or equal to a preset insulation temperature, battery SOC value is less than or equal to the discharge insulation threshold, and discharge depth is greater than or equal to a depth threshold; and In the charging state, the battery is controlled to enter the discharging state in response to the battery temperature being lower than the preset heat preservation temperature, the battery SOC value being greater than the discharge heat preservation threshold, and the battery temperature rise rate being less than the preset rate.

13. A computer storage medium, characterized in that, The computer storage medium includes instructions that, when executed, perform the method according to any one of claims 1 to 6.

14. A computer device, characterized in that, The computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the program to implement the method of any one of claims 1 to 6.

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