Temperature return regulation and control system for power battery
Through the power battery temperature return control system, the PTC heater and motor cooling function pipeline are used, combined with the pulse width modulation heating module, the power battery is achieved quickly and equalized, solving the problems of high energy consumption, large heat loss and large temperature difference in the low temperature return process, and improving the power performance of the vehicle.
Patent Information
- Application Number
- CN202422238760.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-12
AI Technical Summary
During the low temperature return process of existing power batteries, there are problems such as high energy consumption, large heat loss, large temperature difference between the inside and outside, and excessive use, which affects the power performance of the vehicle.
The power battery temperature return control system is adopted, including the PTC heating part, the ATS insulation part and the vehicle controller. Through the PTC heater and the motor cooling function pipeline, combined with the pulse width modulation heating module, the power battery is fully, balanced and fast temperature return.
Effectively reduce the internal and external temperature difference, reduce the return energy consumption, shorten the low-temperature cold start-up and charging time, and greatly improve the performance of the power battery.
Smart Images
Figure CN223156132U_ABST
Abstract
Description
Technical Field
[0001] This patent application relates to the technical field of power batteries for new energy electric vehicles or hybrid vehicles, and particularly to a temperature control system for power batteries of new energy electric vehicles or hybrid vehicles. Background Art
[0002] In the comprehensively and rapidly developing new energy technology for motor vehicles, one of the important topics is how to ensure that the power battery can stably deliver or charge energy within a reasonable temperature range under various temperature environmental conditions, which is particularly important for the electric drive of large buses.
[0003] Currently, there are mainly two technical means to restore the power battery from an abnormal temperature state to a normal operating temperature state. One is to add a heating plate or heating film to heat and transform the low-temperature power battery; the other is to add a coolant pipeline inside the power battery to form a battery cooling circulation system. The two technical means and the power battery form a power battery module package, which ensures the performance stability of the power battery under the detection and control of the battery thermal management system.
[0004] When the battery thermal management system BMS detects that the operating temperature of the power battery is too high, the vehicle control unit VCU commands to start the battery cooling circulation system to cool down the power battery; when the battery thermal management system detects that the power battery is in an over-low temperature state, the working circuit of the heating plate or heating film is closed until the set reasonable temperature limit is reached. This temperature recovery is limited by the operating temperature of the power battery. The maximum operating temperature of the heating plate or heating film cannot exceed 50°C. In addition, the technical limit for the battery temperature rise rate is 0.5°C / min, and due to the obvious heat loss of the heating plate or heating film, generally, the battery temperature recovery takes a long time, affecting the display of the vehicle's dynamic performance and charging performance. Summary of the Invention
[0005] The invention purpose of this patent application is to solve the technical problems existing in the current low-temperature temperature recovery of power batteries, such as high energy consumption, large heat loss, large internal and external temperature difference, and long time consumption, which affect the vehicle's dynamic performance, and to provide a temperature recovery control system for power batteries.
[0006] The technical solution of the temperature recovery control system for power batteries provided by this patent application is mainly as follows:
[0007] A temperature recovery control system for power batteries, which consists of a power battery pack module, a battery thermal management system, and a vehicle control unit. The power battery pack module is used as the temperature-controlled component, which is equipped with a heat transfer medium pipeline and a heating component, and together with the power battery module constitutes the power battery pack module;
[0008] This system also includes a PTC heating part and an ATS heat preservation part;
[0009] Among them, the PTC heating part mainly consists of a first functional pipe section connected with a PTC heater and a liquid pump;
[0010] Among them, the ATS heat preservation part has a main body which is a motor cooling functional pipeline;
[0011] The heat transfer medium pipeline of the power battery pack module has both ends of its connecting main pipe connected to the first functional pipe section through an electric control valve;
[0012] For the said ATS heat preservation part, after an electric control valve is connected in series at both ends of its pipeline, it is connected in parallel to both ends of the main pipe of the heat transfer medium pipeline;
[0013] The said PTC heater, liquid pump, heating components of the power battery pack module and each electric control valve, as controlled actuating components, are correspondingly electrically connected to each execution bus of the vehicle controller;
[0014] For the said vehicle controller, a pulse width modulation heating module is provided therein and is electrically connected to the power battery.
[0015] One preferred option of the above overall technical solution is that the system further includes a passenger compartment part,
[0016] For the said passenger compartment part, its main body is a second functional pipe section connected with a passenger compartment heater.
[0017] One preferred option of the above overall technical solution is that for the heat transfer medium pipeline of the power battery pack module, both ends of its connecting main pipe are respectively connected to the first functional pipe section and the second functional pipe section through a three-way electric control valve.
[0018] One preferred option of the above overall technical solution is that for the said power battery pack module, a proportional flow valve is connected to the inlet end of its heat transfer medium pipeline, and the electric control end of the proportional flow valve is connected to the PWM execution bus of the vehicle controller.
[0019] The technical solution of the power battery warming regulation system disclosed in this patent application effectively reduces the internal and external temperature difference during the warming of the power battery in the low-temperature state, reduces the energy consumption required for warming and heat preservation, realizes the technical purpose of comprehensive, balanced and rapid warming, effectively shortens the low-temperature cold start and low-temperature charging time of the power battery, and greatly improves the performance of the vehicle power battery. Brief Description of the Drawings
[0020] Figure 1 It is the system composition structure diagram of this patent application.
[0021] Figure 2 It is the system circuit composition diagram of this patent application. Detailed Description of the Invention
[0022] The technical content of this power battery warming control system will be elaborated in detail below, and its application technical effects will be described.
[0023] This power battery warming control system consists of a power battery pack module 1, a battery thermal management system 7, and a vehicle controller 5. This system takes the power battery pack module 1 as the core component to be temperature-controlled. It is internally assembled with a heat transfer medium pipeline and a heating component, which together with the power battery module form the power battery pack module 1.
[0024] Among them, for the heating component, a heating plate or a heating film is selected for use.
[0025] The heat transfer medium pipeline can be the existing coolant pipeline network inside the power battery pack or an independently assembled pipeline. If the existing coolant pipeline network is selected, a switching valve controlled by the vehicle controller program is installed on the inlet and outlet main pipes outside the power battery pack module 1 to select and switch the connection to form a battery cooling system or the composition of this system. Generally speaking, because the former existing coolant pipeline network does not require additional components and construction costs in the power battery composition, and for those skilled in the art, the control of the switching valve is also conventional technology and can be achieved without creative labor. Therefore, the following description is simplified and the description of the switching between the original battery cooling system and the composition of this system is omitted.
[0026] This system also includes a PTC heating part, a passenger compartment part, and an ATS heat preservation part.
[0027] Among them, the main composition of the PTC heating part is a first functional pipe section connected with a PTC heater 2 and a water pump 9.
[0028] The main body of the passenger compartment part is a second functional pipe section 4 connected with a passenger compartment heater 8.
[0029] The main body of the ATS heat preservation part is the motor cooling functional pipeline 10.
[0030] As Figure 1 shown, both ends of the main pipe after the parallel connection of the heat transfer medium pipelines of multiple power battery pack modules 1 at the rear compartment, top-mounted and bottom-mounted of the passenger car are connected to a three-way electric control valve 3. The other two controlled pipelines of the three-way electric control valve 3 are respectively connected to the first functional pipe section and the second functional pipe section.
[0031] For the ATS heat preservation part, two-way electric control valves 6 are connected in series at both ends of the motor cooling functional pipeline 10 and then connected to both ends of the main pipe of the parallel connection of the heat transfer medium pipelines of the power battery pack module 1.
[0032] A proportional flow valve 11 is connected to the inlet end of the heat transfer medium pipeline of each power battery pack module 1, and its electronic control end is controlled by the PWM execution bus of the vehicle controller VCU 5 to control the heating and warming flow of the heat transfer medium pipeline of the power battery pack module 1 in real time according to the temperature rise of the power battery.
[0033] The vehicle controller 5 is internally provided with a pulse width modulation heating module 15.
[0034] The PTC heater 2, the liquid pump 9, the heating components of the power battery pack module 1 and each electronic control valve are used as controlled execution components and are correspondingly electrically connected to the respective execution buses of the vehicle controller 5.
[0035] The battery thermal management system 7 monitors the temperature of the power battery. When the obtained current temperature is lower than the set normal operating temperature value T A At this time, the vehicle controller VCU 5 sends a control command to the battery thermal management system BMS 7 to close the positive contactor and the negative contactor, start the heating component, and send an enable feedback signal to the vehicle controller VCU 5. The vehicle controller VCU 5 starts the PTC heater to work, and at the same time starts the pulse width modulation heating module, so that the power battery in the low-temperature state discharges and generates heat by itself under the high-frequency large-current modulation pulse signal; in order to minimize the impact on the battery life, the battery discharges within the set allowable pulse discharge window. The vehicle controller VCU 5 detects the outlet water temperature of the PTC heating part. When it reaches the available set temperature value, it instructs to open the PTC heating part path of the three-way electronic control valve 3, and the PTC heating part participates in the heating cycle of the heat transfer medium pipeline of the power battery pack module 1. The three heating means of the heating component, the PTC heating part and the pulse width modulation heating module are combined inside and outside to make the power battery pack module warm up and heat evenly, comprehensively and stably. During this process, the battery thermal management system 7 monitors the temperature of the power battery in real time. When the temperature reaches the upper limit of the set reasonable temperature value, the vehicle controller VCU 5 shuts off the pulse width modulation heating module, cuts off the positive contactor and the negative contactor, cuts off the PTC heating part, and delays the control of the three-way electronic control valve 3 so that it no longer participates in the warming and heating.
[0036] During the process of battery heating and warming, if the vehicle controller VCU 5 receives the heating demand of the passenger compartment, and it is judged and determined according to the battery heating state that leading part of the PTC heating part to the passenger compartment will not affect the heating and warming of the power battery, the vehicle controller VCU 5 controls the three-way valve 3 to connect to the corresponding passenger compartment path, and at the same time controls the proportional flow valve 11 to effectively adjust the circulating flow rate into the power battery, and meets the heating demand of the passenger compartment while heating the power battery.
[0037] During the operation of the whole vehicle, if the vehicle control unit (VCU) 5 monitors the temperature of the power battery through the battery thermal management system 7, when the temperature reaches the set maximum temperature value at which the heating component should stop the heating operation, it controls to turn off the three-way solenoid valve 3 and turn on the two-way solenoid valve 6, introducing the motor circulating cooling water of the ATS insulation part into the heat transfer medium pipeline of the power battery pack module 1, using the motor circulating cooling water to insulate and assist in heating the power battery. At the same time, the vehicle control unit (VCU) 5 controls the proportional flow valve 11 through the PWM execution bus to finely adjust the flow rate of the heat transfer medium pipeline of the power battery pack module 1.
Claims
1. A power battery warming regulation system, characterized in that, This component includes a power battery pack module, a battery thermal management system, and a vehicle controller. The power battery pack module (1) is the component to be temperature-controlled, which is equipped with a heat transfer medium pipeline and a heating component, and together with the power battery module, it constitutes the power battery pack module; This system also includes a PTC heating part and an ATS heat preservation part; Among them, the main component of the PTC heating part is the first functional pipe section connected with a PTC heater (2) and a liquid pump (9); Among them, the main body of the ATS heat preservation part is the motor cooling functional pipeline (10); The heat transfer medium pipeline of the power battery pack module (1), both ends of its connecting main pipe are connected to the first functional pipe section through an electric control valve; For the said ATS heat preservation part, after an electric control valve is connected in series at both ends of its pipeline, it is connected in parallel to both ends of the heat transfer medium pipeline main pipe; The PTC heater (2), the liquid pump (9), the heating component of the power battery pack module, and each electric control valve, as the controlled execution components, are correspondingly electrically connected to each execution bus of the vehicle controller; For the said vehicle controller, a pulse width modulation heating module is provided therein and is electrically connected to the power battery.
2. The power battery warming control system according to claim 1, wherein This system also includes a passenger compartment part, The main body of the said passenger compartment part is the second functional pipe section (4) connected with a passenger compartment heater (8).
3. The power battery warming control system according to claim 2, wherein Both ends of the connecting main pipe of the heat transfer medium pipeline of the power battery pack module (1) are respectively connected to the first functional pipe section and the second functional pipe section (4) through a three-way electric control valve (3).
4. The power battery warming control system according to claim 1, characterized in that For the said power battery pack module (1), a proportional flow valve (11) is connected to the inlet end of its heat transfer medium pipeline, and the electric control end of the said proportional flow valve (11) is connected to the PWM execution bus of the vehicle controller.