Composite power supply device for cold start of vehicle
By designing a composite power supply device including MCU, buck-up controller, lithium battery module and capacitor module module, the problem of difficulty in starting a vehicle in a low temperature environment is solved, safe and environmentally friendly cold start of the vehicle in a low temperature environment is achieved, and the life of the lithium battery is extended.
Patent Information
- Application Number
- CN202422384887.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The existing vehicle startup power supply solution is difficult to effectively start the vehicle in a low temperature environment, and the lithium battery system is sensitive to temperature, resulting in a reduced battery life, and the power supply voltage of a single lithium ion or lead-acid battery cannot be adjusted, resulting in difficulty in starting.
A composite power supply device is designed, including an MCU, a step-up controller, a lithium battery module and a capacitance module module. The flexible voltage and temperature adjustment is achieved through direct-direct converters and temperature sensors to ensure that the vehicle can be effectively started in a low temperature environment.
The composite power supply device can safely and environmentally friendly the voltage and current in a low temperature environment to ensure the successful cold start of the vehicle and extend the life of the lithium battery by flexibly adjusting the battery temperature.
Smart Images
Figure CN222905479U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power supply, and particularly relates to a composite power supply device for vehicle cold start. Background Art
[0002] The vehicle cold start problem refers to starting the vehicle in a low temperature environment caused by reasons such as winter when the engine water temperature is low, which will damage the driving ability of the vehicle, affect the service life of the engine, and may even cause the vehicle to fail to start. Currently, the power supply solutions commonly used for vehicle starting mainly include lead-acid batteries and lithium batteries. Specifically: The lead-acid battery power supply solution, as a relatively traditional solution, has obvious deficiencies. For example, it is relatively heavy, which is not conducive to the lightweight design of the vehicle; its short service life leads to high costs; it contains heavy metal lead, resulting in strong pollution; and its charging efficiency is low. Based on this, the industry is exploring the use of lighter, more environmentally friendly, and more efficient lithium batteries. While the lithium battery system solves some lead-acid problems, its sensitivity to temperature greatly reduces the battery life. The power supply voltages of a single lithium-ion battery and a single lead-acid battery cannot be adjusted. Therefore, even if the current meets the requirements, due to the low output voltage, when the starting resistance torque of the engine is large, the starting speed still cannot be increased, which will lead to difficult starting. Moreover, a single lithium battery power supply is limited by its discharge rate. In summary, the utility model particularly provides a composite power supply device for vehicle cold start. Content of the Utility Model
[0003] The composite power supply device for vehicle cold start provided by the utility model has a simple structure, is safe and environmentally friendly, has a larger capacity, and can flexibly output voltage to change the battery temperature for vehicle cold start.
[0004] The technical solution provided by the utility model is as follows:
[0005] A composite power supply device for vehicle cold start, comprising:
[0006] An MCU, which is a vehicle microcontroller;
[0007] A buck-boost controller, which is connected to the MCU;
[0008] A boost voltage sensor, one end of which is connected to the buck-boost controller, and the other end is connected to a boost temperature sensor through a DC-DC converter;
[0009] A buck voltage sensor, one end of which is connected to the buck-boost controller, and the other end is connected to a buck temperature sensor through a DC-DC converter;
[0010] A lithium battery module, which is connected to the MCU through a switch temperature sensor;
[0011] A capacitor module is connected to an MCU through a starting current sensor and a starting voltage sensor.
[0012] Preferably, the lithium battery module is a lithium-ion battery, which has a long service life and a large capacity.
[0013] Preferably, the capacitor module is composed of a number of supercapacitors, which have high safety and simple charge and discharge.
[0014] Preferably, the buck-boost controller changes the device temperature by quickly releasing or increasing the voltage.
[0015] Preferably, the temperature sensor inside the device uses a thermocouple temperature sensor, which has high accuracy and a large measurement range.
[0016] Preferably, the current sensor inside the device uses an electronic current transformer, which is small in size and convenient for installation and use.
[0017] Preferably, the voltage sensor inside the device uses a resistive voltage sensor, which has high accuracy and a simple structure.
[0018] Preferably, the positive terminal of the capacitor module extends to be connected in parallel with the total positive terminal of the power supply and the total positive terminal of the external vehicle electrical system, and its negative terminal extends to the total negative terminal of the power supply and is connected in parallel with the total negative terminal of the external vehicle electrical system.
[0019] The beneficial effects of the present utility model are as follows: The composite power supply device for vehicle cold start provided by the present utility model has a simple structure, is safe and environmentally friendly, has a larger capacity, can flexibly output voltage to change the battery temperature, and is used for vehicle cold start. Description of the Drawings
[0020] Figure 1 It is a schematic diagram of the overall structure of the composite power supply device for vehicle cold start described in the present utility model. Detailed Embodiments
[0021] The following further describes the present utility model in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.
[0022] As shown in the figure, an MCU, which is a vehicle microcontroller; a buck-boost controller 112, which is connected to the MCU; a boost voltage sensor 115, one end of which is connected to the buck-boost controller 112, and the other end is connected to a boost temperature sensor 117 through a DC-DC converter 119; a buck voltage sensor 116, one end of which is connected to the buck-boost controller, and the other end is connected to a buck temperature sensor 118 through a DC-DC converter 119; a lithium battery module 120, which is connected to the MCU through a switch temperature sensor 121; a capacitor module 130, which is connected to the MCU through a starting current sensor 131 and a starting voltage sensor 132.
[0023] Among them, the lithium battery module 120 is a lithium-ion battery; the capacitor module 130 is composed of a plurality of supercapacitors.
[0024] As shown in the figure, this composite power supply device can achieve charge and discharge control and vehicle start control. Among them, the charge and discharge control includes charge control and discharge control, and the vehicle start control includes non-cold start control and cold start control. Specifically:
[0025] Under normal temperature conditions, charge control is achieved: when the voltage between the vehicle power supplies exceeds 27V or the current sensor detects that the composite power supply device is charging, the engine of the external vehicle supplies power to the external vehicle electrical system and charges the capacitor module 130; the buck-boost controller 112 switches to the charging mode for the lithium battery module 120. During the operation of this mode, the buck-boost controller 112 monitors the charging current, charging voltage, and cell temperature through the boost voltage sensor 115 and the boost temperature sensor 117; when the temperature of the lithium battery module 120 is higher than the refrigeration set value, the MCU system is switched to the refrigeration mode. When the temperature of the lithium battery module 120 is higher than the maximum operating temperature set value, the buck-boost controller module 112 stops the operation of the charging mode, and waits for the temperature to return to the working allowable temperature set value before the buck-boost controller 112 resumes the operation of the charging mode.
[0026] Under normal temperature conditions, discharge control is achieved: when the voltage between the vehicle power supplies is lower than 25V or the current sensor detects that the composite power supply device is discharging, the composite power supply device supplies power to the external vehicle electrical system; the buck-boost controller 112 switches to the discharging mode from the lithium battery module 120. During the operation of this mode, the buck-boost controller 112 monitors the discharge current, discharge voltage, and cell temperature through the buck voltage sensor 116 and the buck temperature sensor 118; when the temperature of the lithium battery module 120 is higher than the refrigeration set value, the MCU is switched to the refrigeration mode. On the contrary, when the temperature of the lithium battery module 120 is higher than the maximum operating temperature set value, the buck-boost controller 112 stops the operation of the discharging mode, and waits for the temperature to return to the working allowable temperature set value before the buck-boost controller 112 resumes the operation of the discharging mode.
[0027] Under normal temperature conditions, non-cold start control is achieved: when starting the vehicle, the capacitor module 130 alone provides all the starting energy to start the engine of the vehicle; after the engine is normally started, the engine supplies power to the vehicle electrical system and charges the supercapacitor bank; after determining that the engine output voltage is stable and the state of the lithium-ion battery pack meets the charging requirements, the buck-boost controller 112 switches to the charging mode under normal temperature conditions to charge the lithium battery module 120.
[0028] Under extreme cold conditions, cold start control is achieved: when the outside temperature drops below -30°C, the vehicle is stationary for more than 12 hours, and the current sensor detects a discharge of about 100 A, the hybrid power supply device adjusts the output voltage to quickly increase the voltage between the vehicle power supplies to 32 V, so that the starting voltage of the capacitor module 130 reaches or exceeds the output voltage of the external vehicle engine; after this operation is completed, a signal is sent to the driver indicating that the vehicle start status is ready and the vehicle can be started; the hybrid power supply device provides the starting energy to start the external vehicle engine; when the engine starts, the engine supplies power to the external vehicle electrical system and charges the capacitor module 130; the MCU system switches to the heating mode, and after heating the lithium battery module 120 to the rechargeable temperature using the power supply of the engine, the buck-boost controller 112 switches to the charging mode for the lithium battery module 120.
[0029] The hybrid power supply device for vehicle cold start provided by the present utility model has a simple structure, is safe and environmentally friendly, has a larger capacity, and can flexibly output voltage to change the battery temperature for vehicle cold start.
[0030] Although the embodiments of the present utility model have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to specific details and the examples shown and described herein.
Claims
1. A composite power supply device for cold starting of a vehicle, characterized in that: include: MCU, which is the vehicle microcontroller; A buck-boost controller connected to the MCU; A boost voltage sensor, one end of which is connected to the boost-boost controller, and the other end of which is connected to the boost temperature sensor via a DC-DC converter; A buck voltage sensor, one end of which is connected to the buck-boost controller, and the other end of which is connected to the buck temperature sensor via a DC-DC converter; Lithium battery module, which is connected to the MCU via a switch temperature sensor; The capacitor module is connected to the MCU via a startup current sensor and a startup voltage sensor.
2. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The lithium battery module is a lithium-ion battery.
3. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The capacitor module is composed of a plurality of supercapacitors.
4. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The buck-boost controller changes the device temperature by quickly releasing or increasing the voltage.
5. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The temperature sensor in the device adopts a thermocouple temperature sensor.
6. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The current sensor in the device adopts an electronic current transformer.
7. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The voltage sensor in the device adopts a resistance voltage sensor.
8. The composite power supply device for cold starting of a vehicle according to claim 1, characterized in that: The output positive terminal of the capacitor module extends to the total positive pole of the power supply and is connected in parallel with the total positive pole of the external vehicle electrical system, and the output negative terminal extends to the total negative pole of the power supply and is connected in parallel with the total negative pole of the external vehicle electrical system.