Intelligent heating and heat preservation control method and system for 12V lithium batteries in hybrid vehicles

Abstract

A method and system for intelligent heating and insulation control of a 12V lithium battery in a hybrid vehicle includes a lithium battery controller that collects and monitors the cell temperature of the 12V lithium battery; and a vehicle controller that receives information from the lithium battery controller, sends instructions to the execution system, controls the high-voltage power battery pack to power on, and instructs the high-voltage power battery pack and the PTC heater to operate. The high-voltage power battery pack and the PTC heater receive instructions from the vehicle controller (VCU) to heat the 12V lithium battery. This invention overcomes the problem that existing battery systems, due to the characteristics of the battery cells, cannot provide sufficient power for vehicle starting at low temperatures, leading to starting problems. By monitoring the 12V lithium battery through the lithium battery controller and controlling the vehicle's high-voltage system to heat the 12V lithium battery through the vehicle controller, and by sending notifications to users via a mobile app, this invention prevents inconvenience caused by the vehicle failing to start at low temperatures.

Description

Technical Field

[0001] This invention belongs to the field of hybrid vehicle lithium battery technology, specifically a method and system for intelligent charging control of a 12V lithium battery in a hybrid vehicle. Background Technology

[0002] As a representative of new energy vehicles, hybrid vehicles possess advantages such as economy, energy saving, and environmental protection. The battery in a hybrid vehicle includes a high-voltage power battery pack, which provides power to the electric motor (referred to as the "large battery"), and a low-voltage 12V battery (lithium battery), which provides lighting for the instrument panel and steering wheel, as well as power steering (referred to as the "small battery"). When the vehicle is not running, the 12V lithium battery provides power to the entire vehicle. When the vehicle is running, the large battery provides power to the entire vehicle and simultaneously charges the 12V lithium battery through a DC-DC converter (inverter). However, due to the characteristics of the battery cells, existing battery systems cannot provide sufficient power for starting the vehicle at low temperatures, leading to starting problems. Therefore, a smart heating and insulation control strategy for the lithium battery of hybrid vehicles is proposed. Summary of the Invention

[0003] The purpose of this invention is to overcome the problem that existing battery systems cannot provide sufficient power for vehicle starting at low temperatures due to the characteristics of the battery cells, resulting in the vehicle being unable to start at low temperatures. This invention provides a smart heating and heat preservation control method for 12V lithium batteries in hybrid vehicles.

[0004] Another objective of this invention is to provide a system for implementing the above-mentioned intelligent heating and heat preservation control method for 12V lithium batteries in hybrid vehicles.

[0005] The intelligent heating and heat preservation control method for a 12V lithium battery in a hybrid vehicle of the present invention includes: The first step is for the lithium battery controller (LBM) to monitor the temperature of the 12V lithium battery by collecting the cell temperature of the 12V lithium battery through a temperature sensor. If the 12V lithium battery is fault-free, the vehicle is in normal condition. The second step is to set the sleep timer for the lithium battery controller LBM, which automatically wakes up every 2 hours after going into sleep mode. The third step is to wait until the self-wake-up time is reached. The lithium battery controller detects that the minimum temperature of the 12V lithium battery is less than or equal to -10°. If not, it returns to the second step and continues to sleep. If it is, the lithium battery controller wakes up and sends an NM network management message to the vehicle controller VCU to wake up the vehicle and sends a charging and heating request to the vehicle controller VCU. The fourth step is that after the vehicle controller VCU receives the charging and heating request from the lithium battery controller LBM, it determines whether the vehicle has the conditions to apply high voltage. If not, the vehicle controller VCU sends a sleep command to the vehicle and the command display system sends a "heating failure" reminder message to the user through the APP. If so, the vehicle controller VCU executes the high voltage command and controls the heater PTC to heat the 12V lithium battery. Fifth, the lithium battery controller LBM determines whether the minimum temperature Tmin of the 12V lithium battery is greater than or equal to 5°C. If not, heating continues, and after the target temperature is reached, the 12V lithium battery is woken up every 2 hours. It continues to wake up and monitor the 12V lithium battery temperature Tmin. If it is less than or equal to 0°C, it requests heating again to achieve the purpose of heat preservation. If it is, the lithium battery controller LBM sends a stop heating request to the vehicle controller VCU. After receiving the request, the vehicle controller VCU stops heating, controls the vehicle to power down, and then enters sleep mode, ending this heating cycle.

[0006] The fourth step, applying high voltage to the entire vehicle, requires that the vehicle does not have any high-level faults that would preclude it from applying high voltage, such as high-voltage interlock faults, insulation faults, or similar faults.

[0007] To achieve the above objectives, the intelligent heating and insulation control system for a 12V lithium battery in hybrid vehicles of the present invention includes a control system and an execution system. The control system includes a lithium battery controller (LBM): it monitors the temperature of the 12V lithium battery by collecting the cell temperature of the 12V lithium battery through a temperature sensor. If the temperature is lower than the set threshold, it wakes up the vehicle by sending a network management message to the vehicle controller (VCU). A vehicle control unit (VCU) receives information from the lithium battery controller (LBM), sends instructions to the execution system, controls the high-voltage power battery pack to power on, and instructs the high-voltage power battery pack and the heater (PTC) to operate. The execution system includes a high-voltage power battery pack and a heater PTC. The high-voltage power battery pack and the heater PTC receive instructions from the vehicle control unit (VCU) to heat the 12V lithium battery.

[0008] The intelligent heating and insulation control system for 12V lithium batteries in hybrid vehicles of the present invention also includes a display system. The display system receives information from the vehicle controller (VCU) and sends real-time heating status information of the 12V lithium battery to the user via an APP.

[0009] The display system of the present invention includes a mobile APP.

[0010] The present invention relates to a 12V lithium battery intelligent heating and insulation control system for hybrid vehicles, wherein the lithium battery controller LBM automatically wakes up the temperature sensor of the 12V battery once every 2 hours to detect the temperature of the 12V lithium battery.

[0011] The intelligent heating and insulation control system for a 12V lithium battery in a hybrid vehicle of the present invention includes a vehicle controller (VCU) that receives information from a lithium battery controller (LBM) and sends instructions to the execution system to control the high-voltage power battery pack. Powering on the high-voltage power battery pack involves closing the high-voltage battery relay to allow the high-voltage power battery pack to output voltage and supply power to the vehicle.

[0012] Compared with existing technologies, this invention overcomes the problem that existing battery systems cannot provide sufficient power for vehicle starting at low temperatures due to the characteristics of the battery cells, resulting in the vehicle being unable to start at low temperatures. The beneficial effects are: the intelligent heating and insulation system and control method for the 12V lithium battery of the hybrid vehicle of this invention monitors the 12V lithium battery through the lithium battery controller LBM, controls the vehicle's high-voltage system to heat the 12V lithium battery through the vehicle controller VCU, and pushes reminders to users through a mobile APP, allowing users to be aware of the lithium battery heating status in real time, avoiding the inconvenience caused by the vehicle being unable to start at low temperatures. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0014] Figure 1 This is the logic diagram for intelligent heating, heat preservation, and power replenishment of the 12V lithium battery for hybrid vehicles described in this invention.

[0015] Figure 2 This is a schematic diagram of the intelligent heating and insulation control system for 12V lithium batteries in hybrid vehicles according to the present invention. Detailed Implementation

[0016] The control method provided by this invention, such as Figure 1 The logic diagram for intelligent heating, heat preservation, and power replenishment in a 12V lithium battery hybrid vehicle is shown below: The first step is for the lithium battery controller (LBM) to monitor the temperature of the 12V lithium battery by collecting the cell temperature of the 12V lithium battery through a temperature sensor. If the 12V lithium battery is fault-free, the vehicle is in normal condition. The second step involves a 12V lithium battery LBM, a sleep timer, and automatic wake-up every 2 hours after sleep. Third, after the self-wake-up time is reached, the lithium battery controller LBM checks whether the lowest temperature of the lithium battery is less than or equal to -10°C. If not, it returns to the second step and continues to sleep. If it is, the lithium battery controller LBM wakes up and sends an NM network management message to wake up the vehicle, and sends a heating request LBM_heat=0x1 to the vehicle controller VCU. The fourth step is that after the vehicle controller VCU receives the heating request from the lithium battery controller LBM, it determines whether the vehicle has the conditions to apply high voltage. If not, the vehicle controller VCU sends a sleep command to the vehicle and the APP sends a "heating failure" reminder message to the user. If so, the vehicle controller VCU executes the high voltage command and controls the PTC to heat the 12V battery. The fifth step involves the lithium battery controller (LBM) determining whether the battery's minimum temperature (Tmin) is greater than or equal to 5°C. If not, heating continues, and after reaching the target temperature, it wakes up every 2 hours to monitor the battery temperature (Tmin) and request heating again when it is less than or equal to 0°C to maintain the temperature. If the temperature is within 5°C, the LBM sends a stop heating request (LBM_heat=0x0) to the vehicle controller (VCU). Upon receiving the request, the VCU stops heating, powers down the vehicle, and then enters sleep mode, ending the heating process.

[0017] To achieve the purpose of heat preservation, after the 12V lithium battery reaches the target heating temperature for the first time, the temperature will drop. In order to maintain the temperature, it is necessary to request heating again before the 12V lithium battery temperature drops too much.

[0018] Figure 2 In this context, the intelligent heating and insulation control system for the 12V lithium battery of a hybrid vehicle comprises a control system and an execution system. The control system includes a lithium battery controller (LBM): it monitors the 12V lithium battery temperature by collecting the cell temperature of the 12V lithium battery through temperature sensors. If the temperature is lower than a set threshold, it sends a network management message to the vehicle control unit (VCU) to wake up the vehicle (the VCU wakes up the vehicle by recognizing a specific identifier in the network management message). Then, it sends a power replenishment request to the vehicle control unit. The vehicle control unit (VCU) receives information from the lithium battery controller (LBM), sends instructions to the execution system, controls the high-voltage power battery pack to complete the power-on process, and instructs the high-voltage power battery pack and the PTC heater to operate. The execution system includes a high-voltage power battery pack and a PTC heater. The high-voltage power battery pack and PTC heater receive instructions from the vehicle control unit (VCU) to heat the 12V lithium battery. It also includes a display system that receives information from the VCU and sends real-time heating status information of the 12V lithium battery to the user via an app.

Claims

1. A method for intelligent heating and heat preservation control of a 12V lithium battery for hybrid vehicles, characterized in that: include: The first step is for the lithium battery controller (LBM) to monitor the temperature of the 12V lithium battery by collecting the cell temperature of the 12V lithium battery through a temperature sensor. The second step is to set the sleep timer for the lithium battery controller LBM, which automatically wakes up every 2 hours after going into sleep mode. The third step is to wait until the self-wake-up time is reached. The lithium battery controller LBM detects whether the minimum temperature of the 12V lithium battery is less than or equal to -10℃. If not, it returns to the second step and continues to hibernate. If so, the lithium battery controller (LBM) wakes up and sends a network management message to the vehicle controller (VCU), wakes up the vehicle, and sends a charging / heating request to the vehicle controller (VCU). The fourth step is that after the vehicle controller VCU receives the charging and heating request from the lithium battery controller LBM, it determines whether the vehicle has the conditions to apply high voltage. If not, the vehicle controller VCU sends a sleep command to the vehicle and the command display system sends a "heating failure" reminder message to the user through the APP. If so, the vehicle controller VCU executes the high voltage command and controls the heater PTC to heat the 12V lithium battery. The fifth step is for the lithium battery controller LBM to determine whether the minimum temperature Tmin of the 12V lithium battery is greater than or equal to 5℃. If not, heating continues. After the target temperature is reached, the 12V lithium battery is woken up every 2 hours. The battery is woken up again and monitored. When the temperature Tmin of the 12V lithium battery is less than or equal to 0℃, heating is requested again to achieve the purpose of heat preservation. If so, the lithium battery controller (LBM) sends a stop heating request to the vehicle controller (VCU). Upon receiving the request, the VCU stops heating, powers down the vehicle, and then enters sleep mode, ending the heating cycle.

2. The method according to claim 1, characterized in that: Includes control systems and execution systems; The control system includes a lithium battery controller (LBM), which monitors the temperature of the 12V lithium battery by collecting the cell temperature of the 12V lithium battery through a temperature sensor. If the temperature is lower than the set threshold, the system sends a network management message to the vehicle controller (VCU) to wake up the vehicle and then sends a power replenishment request to the vehicle controller (VCU). A vehicle control unit (VCU) receives information from the lithium battery controller (LBM), sends instructions to the execution system, controls the high-voltage power battery pack to power on, and instructs the high-voltage power battery pack and the heater (PTC) to operate. The execution system includes a high-voltage power battery pack and a heater PTC. The high-voltage power battery pack and the heater PTC receive instructions from the vehicle control unit (VCU) to heat the 12V lithium battery.

3. The method according to claim 2, characterized in that: It also includes a display system that receives information from the vehicle control unit (VCU) and sends real-time heating status information of the 12V lithium battery to the user via an app.

4. The intelligent heating and heat preservation control system for a 12V lithium battery in a hybrid vehicle according to claim 3, characterized in that: The display system includes a mobile app.

5. The method according to claim 2, characterized in that: The lithium battery controller LBM wakes up the temperature sensor of the 12V lithium battery every 2 hours to detect the temperature of the 12V lithium battery.

6. The method according to claim 2, characterized in that: The vehicle controller (VCU) receives information from the lithium battery controller (LBM) and sends instructions to the execution system to control the high-voltage power battery pack. Powering on the high-voltage power battery pack involves closing the high-voltage battery relay to allow the high-voltage power battery pack to output voltage and supply power to the vehicle.

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