New energy automobile power battery temperature control system based on active adjustment
By analyzing and actively adjusting the battery heating rate, the problem of delayed response of the cooling system is solved, timely control and safety of battery temperature are achieved, and efficient operation of the battery in cold environments is ensured.
Patent Information
- Application Number
- CN202510789210.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2025-09-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The cooling control system in the existing technology cannot respond to the temperature changes of the power battery in a timely manner, resulting in delayed reaction and posing a safety hazard.
By analyzing the battery's heating rate, the cooling system can be adjusted in advance. Combined with temperature prediction and active adjustment of the heat dissipation system, the battery temperature can be kept balanced in a cold environment. High-power operation or an alarm can be activated before the temperature exceeds the standard to prevent safety accidents.
Timely control of battery temperature is achieved, avoiding problems of over-high or under-high temperatures caused by delayed reaction of the cooling system, and ensuring safe operation and efficient discharge of the battery in cold environments.
Smart Images
Figure CN120637698A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power battery temperature control, and in particular to a new energy vehicle power battery temperature control system based on active regulation. Background Art
[0002] The temperature of a power battery has a significant impact on its performance and lifespan. Excessively high or low temperatures can affect the efficiency of the battery's chemical reactions, leading to performance degradation and shortened lifespan. The ideal operating temperature range for batteries is typically between 20°C and 40°C. Excessively high battery temperatures can lead to thermal runaway, or even fire or explosion. Therefore, effective temperature control is crucial to ensuring the safety and efficient operation of batteries. Power battery temperature control is a key technology for ensuring optimal battery operation, primarily through the battery management system. The BMS uses temperature sensors to monitor battery temperature in real time and develops appropriate temperature control strategies to ensure battery temperature control in different environments. Currently, existing automotive power batteries are generally equipped with cooling systems to cool the power batteries and ensure their normal operation. However, in actual use, the power batteries are affected by the external environment, their own operating conditions, and the load, and the battery temperature fluctuates in a complex and variable manner. Existing cooling control systems use temperature feedback to control the operation of the battery cooling system. That is, the cooling system can only operate after the temperature changes. This results in a delay in the active intervention of the cooling system and is unable to respond to changes in battery temperature in advance. In response to the above technical problems, this application proposes a solution. Summary of the Invention
[0003] The present invention estimates the time it takes for the battery to heat up in a cold environment by analyzing the battery heating rate, thereby adjusting the cooling system in advance according to the estimated heating time, ensuring the reasonable distribution of battery discharge heat, achieving a balance between the battery's own heat supply and heat dissipation, and ensuring that the battery temperature meets the standard in a cold environment. At the same time, when the battery has been running for a long time and the temperature is too high, the time when the battery temperature reaches the temperature threshold can be estimated according to the battery's heating rate, so that before the battery reaches the temperature threshold, the heat dissipation system can be operated at high power or a high temperature alarm can be generated in advance, preventing the problem of safety accidents caused by excessive temperature due to untimely alarm or untimely cooling operation after the battery reaches the temperature threshold. The problem of lag in the control of the battery cooling system relative to the battery temperature change is solved, and a new energy vehicle power battery temperature control system based on active adjustment is proposed.
[0004] The purpose of the present invention can be achieved through the following technical solutions: The temperature control system for the power battery of a new energy vehicle based on active regulation includes a temperature variation analysis unit, which can collect the temperature changes of the power battery and obtain the real-time temperature of the power battery; A cooling control module analyzes the real-time temperature changes of the power battery, controls the heat dissipation power based on the analysis results, and performs a combined analysis of the heat dissipation power and real-time temperature changes to predict temperature overshoots; The cooling control module can also perform statistical analysis on the real-time temperature changes and heat dissipation power changes to obtain the abnormal temperature ratio and heat dissipation ratio. The cooling operation evaluation unit can analyze the temperature anomaly ratio and the heat dissipation anomaly ratio, determine the cause of the anomaly, and generate a heating anomaly signal or a heat dissipation anomaly signal.
[0005] As a preferred embodiment of the present invention, after the temperature change analysis unit obtains the real-time temperature of the power battery, it sends the real-time temperature of the power battery to the temperature reduction control module; The temperature variation analysis unit monitors the temperature at different locations in the power battery, and compares the temperatures obtained at different temperature monitoring locations to obtain the battery cell temperature difference. The maximum value of the battery cell temperature difference is taken as the temperature difference extreme value. If the temperature difference extreme value is greater than the set standard, a temperature uneven distribution signal is generated.
[0006] As a preferred embodiment of the present invention, the temperature reduction control module includes a temperature rise detection module, a temperature reduction execution module and a control accumulation module; The temperature rise detection module acquires the real-time temperature of the power battery and generates a temperature fluctuation curve based on the real-time temperature and time. The temperature rise detection module obtains the temperature change rate at different times through the slope of different points on the temperature fluctuation curve; The temperature reduction execution module controls the active temperature control system of the power battery. The temperature reduction execution module can actively adjust the heat dissipation power of the power battery through the active temperature control system.
[0007] As a preferred embodiment of the present invention, the temperature rise detection module compares the real-time temperature of the power battery with a set temperature suitable range. If the real-time temperature is lower than the set temperature suitable range, a temperature rise signal is generated; if the temperature is higher than the set temperature suitable range, a temperature drop control signal is generated. After generating the temperature rise signal, the temperature rise detection module obtains the temperature change rate on the temperature fluctuation curve. The temperature rise detection module calculates the difference between the real-time temperature and the lower limit of the set temperature suitable range and the temperature change rate to obtain the time during which the real-time temperature rise value is within the temperature suitable range, records it as the preheating time, and compares the preheating time with the set preheating time threshold. If the preheating time is greater than or equal to the set preheating time threshold, a temperature rise control signal is generated. If the preheating time is less than the set preheating time threshold, the temperature change rate is compared with the set temperature rise rate threshold. If the temperature change rate is less than the set temperature rise rate threshold, a temperature rise normal signal is generated. If the temperature change rate is greater than the set temperature rise rate, a temperature reduction control signal is generated.
[0008] As a preferred embodiment of the present invention, after obtaining the temperature increase control signal, the temperature reduction execution module reduces the heat dissipation power based on the current heat dissipation power, and maintains the set time after the reduction until the next signal is obtained; After obtaining the cooling control signal, the cooling execution module increases the cooling power based on the current cooling power and maintains the increased cooling power until the next cooling signal is obtained.
[0009] As a preferred embodiment of the present invention, the cooling execution module counts the number of consecutive acquisitions of the cooling control signal, and generates a high-temperature operation signal when the number of acquisitions of the cooling control signal is greater than a set value; After generating a high-temperature operation signal, the cooling execution module calculates the difference between the real-time temperature of the power battery and the set temperature threshold to obtain a temperature margin, and simultaneously obtains the temperature change rate of the power battery. The temperature margin is divided by the temperature change rate of the power battery to obtain a heating time margin. The cooling execution module compares the heating time margin with the set time threshold. If the heating time margin is less than the set time threshold, a temperature exceeding limit warning is generated.
[0010] As a preferred embodiment of the present invention, the control accumulation module can obtain a heat dissipation power change curve through the heat dissipation power; The control accumulation module records the line segments in the temperature fluctuation curve that are outside the suitable temperature range as abnormal areas, and calculates the proportion of the abnormal areas in the entire temperature fluctuation curve and records it as the abnormal proportion; The control accumulation module records the area in the heat dissipation power change curve where the heat dissipation power is greater than the high heat dissipation power as a high power area, and calculates the proportion of the high power area in the heat dissipation power change curve and records it as the high power proportion, wherein the high heat dissipation power is the maximum heat dissipation power multiplied by the proportional coefficient, and the proportional coefficient is less than 1; The control accumulation module calculates the ratio of the abnormal proportion to the high power proportion to obtain the coupling ratio; The control accumulation module sends the coupling ratio to the cooling operation evaluation unit.
[0011] As a preferred embodiment of the present invention, the cooling operation evaluation unit calculates the difference between the coupling ratio and 1. If the difference between the coupling ratio and 1 is greater than the set value, and the coupling ratio is greater than 1, a heat dissipation abnormality signal is generated. If the difference between the coupling ratio and 1 is greater than the set value, and the coupling ratio is less than 1, a heating abnormality signal is generated.
[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention estimates the time it takes for the battery to heat up in a cold environment by analyzing the battery's heating rate, thereby adjusting the cooling system in advance based on the estimated heating time. This ensures that the operation of the cooling system does not cause the battery temperature to be too low, thereby affecting discharge, and prevents the battery temperature from rising rapidly after reaching an appropriate range due to insufficient cooling system power. This ensures the rational distribution of battery discharge heat, achieves a balance between the battery's own heat supply and heat dissipation, and ensures that the battery temperature meets the standard in a cold environment.
[0013] 2. In the present invention, when the battery temperature is too high due to long-term operation, the time when the battery temperature reaches the temperature threshold can be estimated based on the battery's heating rate. Thus, before the battery reaches the temperature threshold, the heat dissipation system is operated at high power or a high-temperature alarm is generated in advance, thereby preventing the problem of safety accidents caused by excessive temperature due to untimely alarm or untimely cooling operation after the battery reaches the temperature threshold, thereby achieving the purpose of predicting battery temperature changes.
[0014] 3. In the present invention, a statistical analysis is performed on the battery temperature and the power of the heat dissipation system. During the operation of the power battery, the specific operating performance of the battery temperature system and the heat dissipation system is obtained. The health of the power battery and the heat dissipation system is evaluated based on their specific operating performance to avoid accidents caused by battery temperature runaway due to faults in the power battery and its heat dissipation system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.
[0016] Figure 1 is a system block diagram of the present invention; Figure 2 It is a system flow chart of the present invention. DETAILED DESCRIPTION
[0017] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1
[0018] See also Figure 1 - Figure 2 As shown, the new energy vehicle power battery temperature control system based on active regulation includes a temperature change analysis unit, a temperature threshold judgment unit, a cooling operation evaluation unit and a cooling control module; The temperature threshold judgment unit obtains the temperature of the power battery and compares it with a set temperature threshold. If the temperature of the power battery is greater than the set temperature threshold, a temperature excess signal is generated. If the temperature of the power battery is less than or equal to the set temperature threshold, a temperature normal signal is generated. The temperature threshold judgment unit sends the temperature normal signal and the temperature excess signal to the cooling control module. The temperature change analysis unit detects the temperature of the power battery, obtains the real-time temperature of the power battery, and sends the real-time temperature of the power battery to the temperature reduction control module; The temperature variation analysis unit monitors the temperature at different locations in the power battery. The selection of the temperature monitoring locations is determined by the distribution of the battery cells in the power battery. The number of selected temperature monitoring locations is positively correlated with the number of battery cells. The temperature variation analysis unit compares the temperatures obtained at different temperature monitoring locations pairwise to obtain the battery cell temperature difference, and sends all the battery cell temperature differences to the cooling control module. The cooling control module includes a temperature rise detection module, a cooling execution module and a control accumulation module; The temperature rise detection module obtains the real-time temperature of the power battery, generates a time axis based on the temperature and time values in the real-time temperature, and records the temperature values at corresponding positions on the time axis to form a temperature fluctuation curve. The temperature rise detection module obtains the temperature change rate at different times through the slope of different points on the temperature fluctuation curve; The cooling execution module controls the active temperature control system of the power battery. The active temperature control component includes a water cooling channel and a heat dissipation window. The cooling execution module adjusts the heat dissipation power of the power battery by controlling the flow rate of the coolant in the water cooling channel. The heat dissipation power represents the amount of heat that the power battery can dissipate per unit time. During the operation of the power battery, the temperature rise detection module compares the real-time temperature of the power battery with the set temperature suitable range. If the real-time temperature is lower than the set temperature suitable range, a temperature rise signal is generated. If the temperature is higher than the set temperature suitable range, a temperature fall control signal is generated and sent to the temperature fall execution module. After generating the temperature rise signal, the temperature rise detection module obtains the temperature change rate on the temperature fluctuation curve. The temperature rise detection module calculates the difference between the real-time temperature and the lower limit of the set temperature suitable range and the temperature change rate to obtain the time during which the real-time temperature rise value is within the temperature suitable range, records it as the preheating time, and compares the preheating time with the set preheating time threshold. If the preheating time is greater than or equal to the set preheating time threshold, a temperature rise control signal is generated. If the preheating time is less than the set preheating time threshold, the temperature change rate is compared with the set temperature rise rate threshold. If the temperature change rate is less than the set temperature rise rate threshold, a temperature rise normal signal is generated. If the temperature change rate is greater than the set temperature rise rate, a temperature reduction control signal is generated. After receiving the temperature increase control signal, the cooling execution module lowers the cooling power based on the current cooling power and maintains the set time after the reduction until the next signal is obtained; After obtaining the cooling control signal, the cooling execution module increases the cooling power based on the current cooling power and maintains the increased cooling power until the next signal is obtained; If a normal temperature rise signal is obtained, the heat dissipation power remains unchanged. Example 2
[0019] See also Figure 1 - Figure 2 As shown, the cooling execution module counts the number of consecutive acquisitions of the cooling control signal, and generates a high-temperature operation signal when the number of acquisitions of the cooling control signal is greater than a set value; After generating a high-temperature operation signal, the cooling execution module calculates the difference between the real-time temperature of the power battery and the set temperature threshold to obtain the temperature margin, and at the same time obtains the temperature change rate of the power battery. The temperature margin is divided by the temperature change rate of the power battery to obtain the heating time margin. The cooling execution module compares the heating time margin with the set time threshold. If the heating time margin is less than the set time threshold, a temperature exceeding limit warning is generated. If the heating time margin is greater than the set time threshold, no response is made, and the cooling execution module sends the temperature exceeding limit warning to the temperature threshold judgment unit. Example 3
[0020] See also Figure 1 - Figure 2As shown, the control accumulation module can record the heat dissipation power and temperature fluctuation curve of the cooling execution module. When the control accumulation module obtains the heat dissipation power of the cooling execution module, it also obtains the time and records it in the form of a time axis to obtain a heat dissipation power change curve; The control accumulation module records the line segments in the temperature fluctuation curve that are outside the suitable temperature range as abnormal areas. The control accumulation module calculates the proportion of the abnormal areas in the overall temperature fluctuation curve and records it as the abnormal proportion. The control accumulation module records the area in the heat dissipation power change curve where the heat dissipation power is greater than the high heat dissipation power as a high power area, and calculates the proportion of the high power area in the heat dissipation power change curve and records it as the high power proportion, where the high heat dissipation power is the maximum heat dissipation power multiplied by the proportional coefficient, and the proportional coefficient is less than 1; The control accumulation module calculates the ratio of the abnormal proportion and the high power proportion to obtain the coupling ratio; The control accumulation module sends the coupling ratio to the cooling operation evaluation unit; The cooling operation evaluation unit calculates the difference between the coupling ratio and 1. If the difference between the coupling ratio and 1 is greater than the set value, and the coupling ratio is greater than 1, a heat dissipation abnormality signal is generated. If the difference between the coupling ratio and 1 is greater than the set value, and the coupling ratio is less than 1, a heating abnormality signal is generated. The cooling operation evaluation unit sends the heating abnormality signal and the heat dissipation abnormality signal to the management platform through the network, and the management platform generates an audible and visual alarm through the screen.
[0021] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A new energy vehicle power battery temperature control system based on active regulation, characterized in that: It includes a temperature change analysis unit, which can collect the temperature change of the power battery and obtain the real-time temperature of the power battery; A cooling control module analyzes the real-time temperature changes of the power battery, controls the heat dissipation power based on the analysis results, and performs a combined analysis of the heat dissipation power and real-time temperature changes to predict temperature overshoots; The cooling control module can also perform statistical analysis on the real-time temperature changes and heat dissipation power changes to obtain the abnormal temperature ratio and heat dissipation ratio. The cooling operation evaluation unit can analyze the temperature anomaly ratio and the heat dissipation anomaly ratio, determine the cause of the anomaly, and generate a heating anomaly signal or a heat dissipation anomaly signal.
2. The temperature control system for new energy vehicle power battery based on active regulation according to claim 1 is characterized in that: After the temperature change analysis unit obtains the real-time temperature of the power battery, it sends the real-time temperature of the power battery to the temperature reduction control module; The temperature variation analysis unit monitors the temperature at different locations in the power battery, and compares the temperatures obtained at different temperature monitoring locations to obtain the battery cell temperature difference. The maximum value of the battery cell temperature difference is taken as the temperature difference extreme value. If the temperature difference extreme value is greater than the set standard, a temperature uneven distribution signal is generated.
3. The temperature control system for new energy vehicle power battery based on active regulation according to claim 1 is characterized in that: The temperature reduction control module includes a temperature rise detection module, a temperature reduction execution module and a control accumulation module; The temperature rise detection module acquires the real-time temperature of the power battery and generates a temperature fluctuation curve based on the real-time temperature and time. The temperature rise detection module obtains the temperature change rate at different times through the slope of different points on the temperature fluctuation curve; The temperature reduction execution module controls the active temperature control system of the power battery. The temperature reduction execution module can actively adjust the heat dissipation power of the power battery through the active temperature control system.
4. The temperature control system for new energy vehicle power battery based on active regulation according to claim 3 is characterized in that: The temperature rise detection module compares the real-time temperature of the power battery with the set temperature suitable range. If the real-time temperature is lower than the set temperature suitable range, a temperature rise signal is generated. If the real-time temperature is higher than the set temperature suitable range, a temperature fall control signal is generated. After generating the temperature rise signal, the temperature rise detection module obtains the temperature change rate on the temperature fluctuation curve. The temperature rise detection module calculates the difference between the real-time temperature and the lower limit of the set temperature suitable range and the temperature change rate to obtain the time during which the real-time temperature rise value is within the temperature suitable range, records it as the preheating time, and compares the preheating time with the set preheating time threshold. If the preheating time is greater than or equal to the set preheating time threshold, a temperature rise control signal is generated. If the preheating time is less than the set preheating time threshold, the temperature change rate is compared with the set temperature rise rate threshold. If the temperature change rate is less than the set temperature rise rate threshold, a temperature rise normal signal is generated. If the temperature change rate is greater than the set temperature rise rate, a temperature reduction control signal is generated.
5. The temperature control system for new energy vehicle power battery based on active regulation according to claim 1 is characterized in that: After obtaining the temperature increase control signal, the temperature reduction execution module reduces the heat dissipation power based on the current heat dissipation power and maintains the set time after the reduction until the next signal is obtained; After obtaining the cooling control signal, the cooling execution module increases the cooling power based on the current cooling power and maintains the increased cooling power until the next cooling signal is obtained.
6. The temperature control system for new energy vehicle power battery based on active regulation according to claim 5 is characterized in that: The cooling execution module counts the number of consecutive acquisitions of the cooling control signal and generates a high-temperature operation signal when the number of acquisitions of the cooling control signal is greater than a set value; After generating a high-temperature operation signal, the cooling execution module calculates the difference between the real-time temperature of the power battery and the set temperature threshold to obtain a temperature margin, and simultaneously obtains the temperature change rate of the power battery. The temperature margin is divided by the temperature change rate of the power battery to obtain a heating time margin. The cooling execution module compares the heating time margin with the set time threshold. If the heating time margin is less than the set time threshold, a temperature exceeding limit warning is generated.
7. The temperature control system for new energy vehicle power battery based on active regulation according to claim 1 is characterized in that: The control accumulation module can obtain a heat dissipation power change curve through the heat dissipation power; The control accumulation module records the line segments in the temperature fluctuation curve that are outside the suitable temperature range as abnormal areas, and calculates the proportion of the abnormal areas in the entire temperature fluctuation curve and records it as the abnormal proportion; The control accumulation module records the area in the heat dissipation power change curve where the heat dissipation power is greater than the high heat dissipation power as a high power area, and calculates the proportion of the high power area in the heat dissipation power change curve and records it as the high power proportion, wherein the high heat dissipation power is the maximum heat dissipation power multiplied by the proportional coefficient, and the proportional coefficient is less than 1; The control accumulation module calculates the ratio of the abnormal proportion to the high power proportion to obtain the coupling ratio; The control accumulation module sends the coupling ratio to the cooling operation evaluation unit.
8. The temperature control system for new energy vehicle power battery based on active regulation according to claim 1 is characterized in that: The cooling operation evaluation unit calculates the difference between the coupling ratio and 1. If the difference between the coupling ratio and 1 is greater than a set value and the coupling ratio is greater than 1, a heat dissipation abnormality signal is generated. If the difference between the coupling ratio and 1 is greater than the set value and the coupling ratio is less than 1, a heating abnormality signal is generated.