A driving heating control method, device, battery pack and electric vehicle for a battery pack

Abstract

The present invention provides a driving heating control method, device, battery pack and electric vehicle for a battery pack, relating to the technical field of electric vehicles. The method includes: obtaining the average vehicle speed within a preset time period; obtaining the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack; obtaining the target driving mileage of the vehicle; determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack and the target driving mileage; and controlling the temperature of the battery pack according to the target temperature. The solution of the present invention solves the problems in the prior art that it is impossible to adjust the heating of the battery in time through the temperature rise rate of the battery and the driving dynamic time, resulting in the inability to start the time point for heating the battery and the inability to determine the heating power of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly relates to a method and device for controlling the heating of a battery pack during driving, a battery pack, and an electric vehicle. Background Art

[0002] New energy vehicles are becoming more and more popular. However, compared with normal temperature conditions, the performance of the battery packs of new energy vehicles is greatly reduced under low temperature conditions, resulting in frequent charging of new energy vehicle users in autumn and winter. Under low temperature conditions, part of the electric energy of the battery pack is used to heat the battery, and part is used to provide power for the vehicle. How to reasonably allocate the power of the battery pack has a great impact on the mileage retention rate of the battery. The existing driving heating methods cannot adjust the heating of the battery in a timely manner according to the temperature rise rate of the battery and the driving dynamic time, resulting in the time point when the battery heating cannot start, and the heating power of the battery cannot be determined. Summary of the Invention

[0003] Embodiments of the present invention provide a method and device for controlling the heating of a battery pack during driving, a battery pack, and an electric vehicle, which are used to solve the problem in the prior art that the heating of the battery cannot be adjusted in a timely manner according to the temperature rise rate of the battery and the driving dynamic time, resulting in the time point when the battery heating cannot start, and the heating power of the battery cannot be determined.

[0004] Embodiments of the present invention provide a method for controlling the heating of a battery pack during driving, including:

[0005] Obtaining the average vehicle speed within a preset time period;

[0006] Obtaining the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack;

[0007] Obtaining the target driving mileage of the vehicle;

[0008] Determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage;

[0009] Controlling the temperature of the battery pack according to the target temperature.

[0010] Further, the determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage includes:

[0011] Determining the target temperature according to the following formula:

[0012]

[0013] Among them, T input is the target temperature of the water inlet of the battery pack heating device; T is the current temperature of the battery pack, VT is the first temperature rise rate; f(x) is the mileage retention rate of the vehicle at different temperatures of the battery pack; R0 is the nominal mileage; SOC is the state of charge of the battery pack, and V is the average speed of the vehicle within a preset time period;

[0014] Determine the corresponding relationship between the first moment of heating the battery pack by the heating device and the heating temperature rise rate of the battery pack according to the target temperature.

[0015] Further, the mileage retention rate of the vehicle at different temperatures of the battery pack is determined by the following formula:

[0016]

[0017] Among them, T is the current temperature of the battery pack.

[0018] Further, the method further includes:

[0019] When the current temperature of the battery pack is less than the first threshold, control the temperature of the water inlet of the battery pack heating device to rise;

[0020] When the temperature of the battery pack is greater than the second threshold, control the temperature of the water inlet of the battery pack heating device to stop rising.

[0021] Further, when the current temperature of the battery pack is less than the first threshold, controlling the temperature of the water inlet of the battery pack heating device to rise includes:

[0022] Obtain the power consumption and the power generation amount generated by heating the battery pack by the battery pack heating device;

[0023] When the ratio of the power consumption to the power generation amount is greater than 1, control the temperature of the water inlet of the battery pack heating device to stop rising.

[0024] Further, obtaining the power consumption and the power generation amount generated by heating the battery pack by the battery pack heating device includes:

[0025] Obtain the average power consumption for the battery pack to rise by a preset temperature;

[0026] Determine the energy consumption for heating the battery pack according to the average power consumption and the current temperature of the battery pack;

[0027] Obtain the correspondence between the power and temperature of the battery pack;

[0028] Determine the beneficial energy for heating the battery pack according to the correspondence between the power and temperature.

[0029] Further, the correspondence between the power and temperature of the battery pack is determined by the following formula:

[0030]

[0031] Wherein, C(T) is the power of the battery pack at different temperatures; T is the current temperature of the battery pack.

[0032] An embodiment of the present invention further provides a battery pack driving heating control device, including:

[0033] A first acquisition module, configured to acquire the average vehicle speed of the vehicle within a preset time period;

[0034] A second acquisition module, configured to acquire the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack;

[0035] A third acquisition module, configured to acquire the target driving mileage of the vehicle;

[0036] A determination module, configured to determine the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed of the vehicle within the preset time period, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage;

[0037] A control module, configured to control the temperature of the battery pack according to the target temperature.

[0038] An embodiment of the present invention further provides a battery pack, including the battery pack driving heating control device as described above.

[0039] An embodiment of the present invention further provides an electric vehicle, including the battery pack as described above.

[0040] The beneficial effects of the present invention are:

[0041] The battery pack driving heating control method according to the embodiment of the present invention determines the target temperature of the water inlet of the battery pack heating device based on the average vehicle speed within a preset time period of the vehicle, the first temperature rise rate at which the temperature of the vehicle battery pack rises by a preset value, the state of charge of the battery pack, and the target driving mileage of the vehicle; and determines whether it is necessary to heat the battery pack according to the target temperature, so as to control the temperature of the battery pack to adjust the heating of the battery in a timely manner according to the dynamic time of driving. This solves the problem in the prior art that the heating of the battery cannot be adjusted in a timely manner through the temperature rise rate of the battery and the dynamic driving time, resulting in the inability to determine the time point to start heating the battery and the power for heating the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram showing the steps of the battery pack driving heating control method according to the embodiment of the present invention;

[0043] Figure 2 A schematic diagram showing the modules of the battery pack driving heating control device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Aiming at the problem in the prior art that the heating of the battery cannot be adjusted in a timely manner through the temperature rise rate of the battery and the dynamic driving time, resulting in the inability to determine the time point to start heating the battery and the power for heating the battery, the present invention provides a battery pack driving heating control method, device, battery pack, and electric vehicle.

[0046] As Figure 1 shown, the embodiment of the present invention provides a battery pack driving heating control method, including the following steps:

[0047] Step 101, obtaining the average vehicle speed within a preset time period of the vehicle;

[0048] Step 102, obtaining the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack;

[0049] Step 103, obtaining the target driving mileage of the vehicle;

[0050] Step 104, determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage;

[0051] Step 105, controlling the temperature of the battery pack according to the target temperature.

[0052] Optionally, the first temperature rise rate at which the temperature of the battery pack rises by a preset value may be the temperature rise rate at which the battery pack has recently successively risen by a preset temperature, for example, 5 degrees.

[0053] Optionally, the average vehicle speed within a preset time period of the vehicle can be obtained by the vehicle controller; the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack can be obtained by the telemetry device; the target driving mileage of the vehicle can be obtained through the navigation map or the user's historical behavior data.

[0054] The battery pack driving heating control method according to the embodiments of the present invention determines the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within a preset time period of the vehicle, the first temperature rise rate at which the temperature of the vehicle battery pack rises by a preset value, the state of charge of the battery pack, and the target driving mileage of the vehicle; and determines whether to heat the battery pack according to the target temperature, so as to control the temperature of the battery pack to adjust the heating of the battery pack in a timely manner according to the dynamic time of driving. It solves the problems in the prior art that the heating of the battery cannot be adjusted in a timely manner according to the temperature rise rate of the battery and the dynamic driving time, resulting in the inability to determine the time point to start heating the battery and the inability to determine the heating power of the battery.

[0055] Optionally, determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within a preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage includes:

[0056] Determine the target temperature according to the following formula:

[0057]

[0058] wherein, T input is the target temperature of the water inlet of the battery pack heating device; T is the current temperature of the battery pack, VT is the first temperature rise rate; f(x) is the mileage retention rate of the vehicle at different temperatures of the battery pack; R0 is the nominal mileage; SOC is the state of charge of the battery pack, and V is the average speed of the vehicle within a preset time period;

[0059] Determine the corresponding relationship between the first moment of heating the battery pack by the heating device and the heating temperature rise rate according to the target temperature.

[0060] The driving heating control method of the battery pack according to the embodiment of the present invention determines the corresponding relationship between the first moment when the heating device heats the battery pack and the heating temperature rise rate of the battery pack, and heats the battery pack at the heating power corresponding to the first heating temperature rise rate at the first moment, so that when the battery pack reaches the target location, the temperature of the battery pack reaches the preset temperature.

[0061] Optionally, the mileage retention rate of the vehicle at different temperatures of the battery pack is determined by the following formula:

[0062]

[0063] wherein, T is the current temperature of the battery pack.

[0064] The driving heating control method of the battery pack according to the embodiment of the present invention determines the mileage retention rate of the vehicle at different temperatures of the battery pack through the EVTEST test method.

[0065] Optionally, the method further includes:

[0066] When the current temperature of the battery pack is less than the first threshold, control the temperature at the water inlet of the battery pack heating device to increase;

[0067] When the temperature of the battery pack is greater than the second threshold, control the temperature at the water inlet of the battery pack heating device to stop increasing.

[0068] In an embodiment of the present invention, when the temperature of the battery pack is greater than the second threshold, there is no need to heat the battery pack anymore. Adjust the heating condition in a timely manner according to the real-time temperature of the battery pack to avoid reducing the driving range of the vehicle caused by excessive power consumption for heating the battery pack.

[0069] Optionally, when the current temperature of the battery pack is less than the first threshold, controlling the temperature at the water inlet of the battery pack heating device to increase includes:

[0070] Obtain the power consumption and revenue power generated by the battery pack heating device for heating the battery pack;

[0071] When the ratio of the power consumption to the revenue power is greater than 1, control the temperature at the water inlet of the battery pack heating device to stop increasing.

[0072] The battery pack driving heating control method according to the embodiment of the present invention judges the power consumption and revenue power generated by the battery pack when the battery pack heating device heats the battery pack, determines the relationship between the power consumption and revenue power generated by the battery pack heating device heating the battery pack. When the power consumption is greater than the revenue power, the temperature of the water inlet of the battery pack heating device is controlled to stop rising, so as to avoid consuming excessive electric energy for heating the battery pack, thereby improving the cruising range of the vehicle.

[0073] Optionally, obtaining the power consumption and revenue power generated by the battery pack heating device heating the battery pack includes:

[0074] Obtaining the average power consumption for the battery pack to rise to a preset temperature;

[0075] Determining the consumed energy for heating the battery pack according to the average power consumption and the current temperature of the battery pack;

[0076] Obtaining the correspondence between the power and temperature of the battery pack;

[0077] Determining the revenue energy for heating the battery pack according to the correspondence between the power and temperature.

[0078] In an embodiment of the present invention, the power consumption generated by the battery pack heating device heating the battery pack is the product of the average power consumption for the battery pack to rise to the preset temperature and the current temperature of the battery pack; the revenue power generated by the battery pack heating device heating the battery pack is the product of the correspondence between the power and temperature of the battery pack and the nominal power of the battery pack at the current temperature.

[0079] Optionally, the correspondence between the power and temperature of the battery pack is determined by the following formula:

[0080]

[0081] Where C(T) is the power of the battery pack at different temperatures; T is the current temperature of the battery pack.

[0082] The embodiment of the present invention further provides a battery pack driving heating control device 200, including:

[0083] The first acquisition module 201 is used to acquire the average vehicle speed of the vehicle within a preset time period;

[0084] The second acquisition module 202 is used to acquire the current temperature of the battery pack, the first temperature rise rate of the battery pack temperature rising by a preset value, and the state of charge of the battery pack;

[0085] A third acquisition module 203, configured to acquire the target driving mileage of the vehicle;

[0086] A determination module 204, configured to determine the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within a preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage;

[0087] A control module 205, configured to control the temperature of the battery pack according to the target temperature.

[0088] The battery pack driving heating control device according to the embodiment of the present invention determines the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within a preset time period of the vehicle, the first temperature rise rate at which the temperature of the vehicle battery pack rises by a preset value, the state of charge of the battery pack, and the target driving mileage of the vehicle; and determines whether it is necessary to heat the battery pack according to the target temperature, so as to control the temperature of the battery pack to adjust the heating of the battery pack in a timely manner according to the dynamic time of driving. It solves the problem in the prior art that the heating of the battery cannot be adjusted in a timely manner through the temperature rise rate of the battery and the dynamic driving time, resulting in the inability to determine the time point to start heating the battery and the inability to determine the heating power of the battery.

[0089] The embodiment of the present invention further provides a battery pack, including the battery pack driving heating control device as described above.

[0090] The embodiment of the present invention further provides an electric vehicle, including the battery pack as described above.

[0091] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements can be made without departing from the principle described in the present invention, and these improvements and refinements are also within the protection scope of the present invention.

Claims

1. A driving heating control method for a battery pack, characterized in that, Including: Obtain the average vehicle speed within a preset time period; Obtain the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack; Obtain the target driving mileage of the vehicle; Determine the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage; Control the temperature of the battery pack according to the target temperature; The determining the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage includes: Determine the target temperature according to the following formula: Among them, T input is the target temperature of the water inlet of the battery pack heating device; T is the current temperature of the battery pack, VT is the first temperature rise rate; f(x) is the mileage retention rate of the vehicle with the battery pack at different temperatures, and the mileage retention rate of the vehicle with the battery pack at different temperatures is determined by the following formula: T is the temperature of the current battery pack; R0 is the nominal mileage; SOC is the state of charge of the battery pack, and V is the average speed of the vehicle within a preset time period; Determine the corresponding relationship between the first moment of heating the battery pack by the heating device and the heating temperature rise rate of the battery pack according to the target temperature.

2. The battery pack driving heating control method according to claim 1, wherein, The method further includes: When the current temperature of the battery pack is less than the first threshold, control the temperature of the water inlet of the battery pack heating device to rise; When the temperature of the battery pack is greater than the second threshold, control the temperature of the water inlet of the battery pack heating device to stop rising.

3. The method for controlling the driving heating of the battery pack according to claim 2, wherein, The controlling the temperature of the water inlet of the battery pack heating device to rise when the current temperature of the battery pack is less than the first threshold includes: Obtain the power consumption and the revenue power generated by the battery pack heating device for heating the battery pack; When the ratio of the power consumption to the revenue power is greater than 1, control the temperature of the water inlet of the battery pack heating device to stop rising.

4. The method for controlling the driving heating of the battery pack according to claim 2, wherein The obtaining the power consumption and the revenue power generated by the battery pack heating device for heating the battery pack includes: Obtain the average power consumption for the battery pack to rise by a preset temperature; Determine the consumed energy for heating the battery pack according to the average power consumption and the current temperature of the battery pack; Obtain the corresponding relationship between the power and the temperature of the battery pack; Determine the revenue energy for heating the battery pack according to the corresponding relationship between the power and the temperature.

5. The battery pack driving heating control method according to claim 4, wherein The corresponding relationship between the power and the temperature of the battery pack is determined by the following formula: where C(T) is the power of the battery pack at different temperatures; T is the current temperature of the battery pack.

6. A driving heating control device for a battery pack, characterized in that, Including: A first obtaining module, configured to obtain the average vehicle speed within a preset time period; A second obtaining module, configured to obtain the current temperature of the battery pack, the first temperature rise rate at which the temperature of the battery pack rises by a preset value, and the state of charge of the battery pack; A third obtaining module, configured to obtain the target driving mileage of the vehicle; A determining module, configured to determine the target temperature of the water inlet of the battery pack heating device according to the average vehicle speed within the preset time period of the vehicle, the first temperature rise rate, the state of charge of the battery pack, and the target driving mileage; A control module, configured to control the temperature of the battery pack according to the target temperature; The determining module is further configured to determine the target temperature according to the following formula: Wherein, T input is the target temperature of the water inlet of the battery pack heating device; T is the current temperature of the battery pack, VT is the first temperature rise rate; f(x) is the mileage retention rate of the vehicle with the battery pack at different temperatures, and the mileage retention rate of the vehicle with the battery pack at different temperatures is determined by the following formula: T is the temperature of the current battery pack; R0 is the nominal mileage; SOC is the state of charge of the battery pack, and V is the average speed of the vehicle within a preset time period; Determine the corresponding relationship between the first moment of heating the battery pack by the heating device and the heating temperature rise rate of the battery pack according to the target temperature.

7. A battery pack, characterized in that, Comprise the battery pack driving heating control device as described in Claim 6.

8. An electric vehicle, characterized in that, Comprise the battery pack as described in Claim 7.

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