A vehicle-mounted battery heating control method and device

Abstract

The present application provides a vehicle-mounted battery heating control method and device. The method includes: when the vehicle-mounted battery is charging, determining whether the battery temperature meets a preset heating range; when the battery temperature meets the preset heating range, controlling a battery heater to heat the vehicle-mounted battery to a first heating-off temperature; determining whether the charging current is less than a first current threshold; and when the charging current is less than the first current threshold, stopping the battery heater from continuously heating the vehicle-mounted battery. It can be seen that this method can charge the vehicle-mounted battery with the most ideal charging current, thereby improving the charging efficiency.

Description

Technical Field

[0001] This application relates to the field of vehicle-mounted batteries, and more particularly, to a method and device for controlling the heating of vehicle-mounted batteries. Background Art

[0002] According to the existing communication protocol for DC charging, the output capacity (current) of the charging gun is only sent to the bus during the charging configuration phase and received by the BMS. This makes it impossible for the vehicle side to obtain the output current of the current charging gun in real time during DC charging. However, in practice, it is found that this situation may cause the vehicle side not to know that the output current of the DC charging pile may sometimes become smaller (for example, initially a single gun outputs with a large capacity; after a period of time, another vehicle comes to charge, and the dual-gun output reduces the capacity of a single gun), resulting in the inability to increase the actual charging current for a relatively high battery temperature (because the gun-end capacity has reached the limit); at the same time, in this case, the electric heater also draws a part of the power from the gun end, so that the actual charging battery cannot reach the ideal state. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a method and device for controlling the heating of vehicle-mounted batteries, which can charge the vehicle-mounted batteries with the most ideal charging current, thereby improving the charging efficiency.

[0004] The first aspect of the embodiments of this application provides a method for controlling the heating of vehicle-mounted batteries, including:

[0005] When the vehicle-mounted battery is charging, determine whether the battery temperature meets a preset heating range;

[0006] When the battery temperature meets the preset heating range, control the battery heater to heat the vehicle-mounted battery to a first heating shutdown temperature;

[0007] Determine whether the charging current is less than a first current threshold;

[0008] When the charging current is less than the first current threshold, stop the battery heater from continuously heating the vehicle-mounted battery.

[0009] In the above implementation process, the method can first determine whether the battery temperature meets the preset heating range when the vehicle-mounted battery is charging; and when the battery temperature meets the preset heating range, control the battery heater to heat the vehicle-mounted battery to the first heating shutdown temperature; then, determine whether the charging current is less than the first current threshold; and when the charging current is less than the first current threshold, stop the battery heater from continuously heating the vehicle-mounted battery. It can be seen that implementing this implementation method can avoid excessive power consumption of the battery heater, so that the charging gun can charge the vehicle-mounted battery with the most ideal charging current, thereby improving the charging efficiency.

[0010] Further, the method further includes:

[0011] When the charging current is not less than the first current threshold, controlling the battery heater to continue heating the vehicle-mounted battery to a second heating-off temperature;

[0012] Judging whether the charging current is less than a second current threshold;

[0013] When the charging current is less than the second current threshold, stopping the battery heater from continuing to heat the vehicle-mounted battery.

[0014] Further, the method further includes:

[0015] When the charging current is not less than the second current threshold, controlling the battery heater to continue heating the vehicle-mounted battery to a third heating-off temperature.

[0016] Further, the method includes:

[0017] Judging whether the charging current changes;

[0018] When the charging current changes, triggering the step of judging whether the battery temperature meets a preset heating range.

[0019] Further, the preset heating range is a temperature range greater than the minimum heating start temperature and less than the maximum heating-off temperature.

[0020] Further, the first heating-off temperature, the second heating-off temperature, and the third heating-off temperature are calculated based on different charging currents, the current ambient temperature, the battery power, and the optimal charging time.

[0021] A second aspect of the embodiments of the present application provides a vehicle-mounted battery heating control device, and the vehicle-mounted battery heating control device includes:

[0022] A first judgment unit, configured to judge whether the battery temperature meets a preset heating range when the vehicle-mounted battery is charging;

[0023] A control unit, configured to control the battery heater to heat the vehicle-mounted battery to a first heating-off temperature when the battery temperature meets the preset heating range;

[0024] A second judgment unit, configured to judge whether the charging current is less than a first current threshold;

[0025] The control unit is further configured to stop the battery heater from continuing to heat the vehicle-mounted battery when the charging current is less than the first current threshold.

[0026] In the above implementation process, the device can use the first judgment unit to judge whether the battery temperature meets the preset heating range when the vehicle-mounted battery is charging; use the control unit to control the battery heater to heat the vehicle-mounted battery to the first heating shutdown temperature when the battery temperature meets the preset heating range; use the second judgment unit to judge whether the charging current is less than the first current threshold; use the control unit to stop the battery heater from continuously heating the vehicle-mounted battery when the charging current is less than the first current threshold. It can be seen that implementing this implementation method can avoid excessive power consumption of the battery heater, enabling the charging gun to charge the vehicle-mounted battery with the most ideal charging current, thereby improving the charging efficiency.

[0027] Further, the vehicle-mounted battery heating control device further includes:

[0028] The control unit is further configured to control the battery heater to continuously heat the vehicle-mounted battery to the second heating shutdown temperature when the charging current is not less than the first current threshold;

[0029] The third judgment unit is used to judge whether the charging current is less than the second current threshold;

[0030] The control unit is further configured to stop the battery heater from continuously heating the vehicle-mounted battery when the charging current is less than the second current threshold.

[0031] Further, the control unit is further configured to control the battery heater to continuously heat the vehicle-mounted battery to the third heating shutdown temperature when the charging current is not less than the second current threshold.

[0032] Further, the vehicle-mounted battery heating control device further includes:

[0033] The fourth judgment unit is used to judge whether the charging current changes;

[0034] The first judgment unit is specifically configured to judge whether the battery temperature meets the preset heating range when the charging current changes.

[0035] Further, the preset heating range is a temperature range greater than the minimum heating start temperature and less than the maximum heating shutdown temperature.

[0036] Further, the first heating shutdown temperature, the second heating shutdown temperature, and the third heating shutdown temperature are calculated based on different charging currents, the current ambient temperature, the battery power, and the optimal charging time.

[0037] In a third aspect of the embodiments of the present application, an electronic device is provided, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the vehicle-mounted battery heating control method according to any one of the first aspects of the embodiments of the present application.

[0038] In a fourth aspect of the embodiments of the present application, a computer-readable storage medium is provided, which stores computer program instructions. When the computer program instructions are read and run by a processor, the vehicle-mounted battery heating control method according to any one of the first aspects of the embodiments of the present application is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a schematic flowchart of a vehicle-mounted battery heating control method provided by an embodiment of the present application;

[0041] Figure 2 It is a schematic structural diagram of a vehicle-mounted battery heating control device provided by an embodiment of the present application;

[0042] Figure 3 It is a diagram showing the influence of the temperature of a lithium-ion power battery on the battery charging current provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The following will describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application.

[0044] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0045] Embodiment 1

[0046] Please refer to Figure 1 , Figure 1 which is a schematic flowchart of a vehicle-mounted battery heating control method provided by this embodiment. Among them, the vehicle-mounted battery heating control method includes:

[0047] S101. When the vehicle-mounted battery is charging, determine whether the battery temperature meets the preset heating range. If so, execute step S102; if not, end this process.

[0048] In this embodiment, the preset heating range is a temperature range greater than the minimum heating start temperature and less than the maximum heating off temperature.

[0049] In this embodiment, the method sets the upper and lower limits of the battery temperature during DC charging.

[0050] ① When the battery temperature is lower than TBAT_THD_MIN (i.e., the minimum heating start temperature), ignore BAT_THDOFF_ONE, BAT_THDOFF_TWO, BAT_THDOFF_THR, and heating should be started.

[0051] ② When the battery temperature is higher than TBAT_THD_MAX (i.e., the maximum heating off temperature), ignore TBAT_THDON_ONE, TBAT_THDON_TWO, TBAT_THDON_THR, and heating should be turned off.

[0052] S102. Control the battery heater to heat the vehicle-mounted battery to the first heating off temperature.

[0053] S103. Determine whether the charging current is less than the first current threshold. If so, execute step S104; if not, execute steps S105 - S106.

[0054] S104. Stop the battery heater from continuously heating the vehicle-mounted battery and end this process.

[0055] S105. Control the battery heater to continuously heat the vehicle-mounted battery to the second heating off temperature.

[0056] S106. Determine whether the charging current is less than the second current threshold. If so, execute step S107; if not, execute step S108;

[0057] S107. Stop the battery heater from continuously heating the vehicle-mounted battery and end this process.

[0058] S108. Control the battery heater to continuously heat the vehicle-mounted battery to the third heating off temperature.

[0059] In this embodiment, the first heating off temperature, the second heating off temperature, and the third heating off temperature are calculated based on different charging currents, the current ambient temperature, the battery charge, and the optimal charging time.

[0060] In this embodiment, the unit of SOC (state of charge of the battery) involved in this method is %, the time unit is min, and the temperature unit is °C.

[0061] In this embodiment, the charging time index is divided into the following two types of scenarios:

[0062] Scenario 1, DISPSOC (displayed state of charge): 0% to 100%, assuming the weight ratio is λ1

[0063] Scenario 2, DISPSOC: 30% to 80%, assuming the weight ratio is λ2

[0064] Among them, DISPSOC is the displayed SOC; λ1 + λ2 = 1, both λ1 and λ2 are greater than zero, and the specific allocation is determined by the vehicle manufacturer.

[0065] For example, the steps included in the strategy implementation of this method are as follows:

[0066] Step 1: Find the maximum charging current IMAX_DCDCHG of the power battery installed in the vehicle during DC charging.

[0067] Step 2: Divide IMAX_DCDCHG into three grades as an example.

[0068] The first grade is IMAX_DCDCHG_ONE = IMAX_DCDCHG * ψONE;

[0069] The second grade is IMAX_DCDCHG_TWO = IMAX_DCDCHG * ψTWO;

[0070] The third grade is IMAX_DCDCHG_THR = IMAX_DCDCHG

[0071] Among them, 1 > ψTWO > ψONE > 0, and the specific values of ψONE and ψTWO are determined by the vehicle manufacturer. Generally, it is recommended that the two should not be too close, and at the same time, the setting of ψONE should not be too small, and the situation of the charging pile with the lowest industry capacity can be referred to.

[0072] In this embodiment, the method for calculating the first heating-off temperature, the second heating-off temperature, and the third heating-off temperature of this method is as shown in the following several situations:

[0073] ① When the ambient temperature is -12°C, select a charging pile whose charging capacity is close to but not higher than IMAX_DCDCHG_ONE. Based on the above Scenario 1 and Scenario 2, find the battery heating thresholds TBAT_THDON_ONE and TBAT_THDOFF_ONE, so that FUNCTARGET_ONE = λ1 * TIME_DCCHG1_ONE + λ2 * TIME_DCCHG2_ONE is the smallest.

[0074] Among them, TIME_DCCHG1_ONE is the charging time of Scenario 1 at the first gear;

[0075] TIME_DCCHG2_ONE is the charging time of Scenario 2 at the first gear.

[0076] TBAT_THDON_ONE is the first heating start temperature for turning on battery heating during DC charging corresponding to the first gear;

[0077] TBAT_THDOFF_ONE is the first heating stop temperature for turning off battery heating during DC charging corresponding to the first gear.

[0078] ② When the ambient temperature is -12°C, select a charging pile whose charging capacity is close to but not higher than IMAX_DCDCHG_TWO. Based on the above Scenario 1 and Scenario 2, find the battery heating thresholds TBAT_THDON_TWO and TBAT_THDOFF_TWO such that FUNCTARGET_TWO = λ1*TIME_DCCHG1_TWO + λ2*TIME_DCCHG2_TWO is minimized.

[0079] Among them, TIME_DCCHG1_TWO is the charging time of Scenario 1 at the second gear;

[0080] TIME_DCCHG2_TWO is the charging time of Scenario 2 at the second gear.

[0081] TBAT_THDON_TWO is the second heating start temperature for turning on battery heating during DC charging corresponding to the second gear;

[0082] TBAT_THDOFF_TWO is the second heating stop temperature for turning off battery heating during DC charging corresponding to the second gear.

[0083] ③ When the ambient temperature is -12°C, select a charging pile whose charging capacity is higher than IMAX_DCDCHG_THR. Based on the above Scenario 1 and Scenario 2, find the battery heating thresholds TBAT_THDON_THR and TBAT_THDOFF_THR such that FUNCTARGET_THR = λ1*TIME_DCCHG1_THR + λ2*TIME_DCCHG2_THR is minimized.

[0084] Among them, TIME_DCCHG1_THR is the charging time of Scenario 1 at the third gear;

[0085] TIME_DCCHG2_THR is the charging time of Scenario 2 at the third gear.

[0086] TBAT_THDON_THR is the third heating start temperature for turning on the battery heating during DC charging corresponding to the third gear;

[0087] TBAT_THDOFF_THR is the third heating stop temperature for turning off the battery heating during DC charging corresponding to the third gear.

[0088] As an alternative embodiment, the method further includes:

[0089] Determine whether the charging current changes;

[0090] When the charging current changes, trigger the step of determining whether the battery temperature meets the preset heating range.

[0091] Please refer to Figure 3 , Figure 3 It can be seen that as the temperature rises, the battery charging current increases accordingly. Based on this, a reasonable battery heating strategy can increase the charging current and shorten the charging time.

[0092] In this embodiment, the execution subject of the method can be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0093] In this embodiment, the execution subject of the method can also be a smart device such as a smart phone or a tablet computer, and no limitation is made in this embodiment.

[0094] It can be seen that implementing the on-vehicle battery heating control method described in this embodiment can have a reasonable battery heating strategy, increase the charging current, and shorten the charging time.

[0095] Embodiment 2

[0096] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of an on-vehicle battery heating control device provided in this embodiment. As Figure 2 shown, the on-vehicle battery heating control device includes:

[0097] A first judgment unit 210, configured to judge whether the battery temperature meets the preset heating range when the on-vehicle battery is charging;

[0098] A control unit 220, configured to control the battery heater to heat the on-vehicle battery to the first heating stop temperature when the battery temperature meets the preset heating range;

[0099] A second judgment unit 230, configured to judge whether the charging current is less than the first current threshold;

[0100] The control unit 220 is further configured to stop the battery heater from continuously heating the on-vehicle battery when the charging current is less than the first current threshold.

[0101] As an alternative embodiment, the in - vehicle battery heating control device further includes:

[0102] The control unit 220 is further configured to control the battery heater to continue heating the in - vehicle battery to a second heating - off temperature when the charging current is not less than a first current threshold;

[0103] The third determination unit 240 is configured to determine whether the charging current is less than a second current threshold;

[0104] The control unit 220 is further configured to stop the battery heater from continuing to heat the in - vehicle battery when the charging current is less than the second current threshold.

[0105] As an alternative embodiment, the control unit 220 is further configured to control the battery heater to continue heating the in - vehicle battery to a third heating - off temperature when the charging current is not less than the second current threshold.

[0106] As an alternative embodiment, the in - vehicle battery heating control device further includes:

[0107] The fourth determination unit 250 is configured to determine whether the charging current changes;

[0108] The first determination unit 210 is specifically configured to determine whether the battery temperature meets a preset heating range when the charging current changes.

[0109] In this embodiment, the preset heating range is a temperature range greater than the minimum heating start temperature and less than the maximum heating - off temperature.

[0110] In this embodiment, the first heating - off temperature, the second heating - off temperature, and the third heating - off temperature are calculated based on different charging currents, the current ambient temperature, the battery power, and the optimal charging time.

[0111] In this embodiment, the explanation of the in - vehicle battery heating control device can refer to the description in Embodiment 1, and will not be elaborated here.

[0112] It can be seen that implementing the in - vehicle battery heating control device described in this embodiment can adopt a reasonable battery heating strategy, improve the charging current, and shorten the charging time.

[0113] This application embodiment provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the in - vehicle battery heating control method in Embodiment 1 of this application.

[0114] An embodiment of the present application provides a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, execute the in-vehicle battery heating control method in Embodiment 1 of the present application.

[0115] In several embodiments provided by the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0116] In addition, in each embodiment of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0117] If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0118] The above are only the embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0119] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and all of them should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0120] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A vehicle-mounted battery heating control method, characterized in that, Including: When the vehicle-mounted battery is charging, determine whether the battery temperature meets a preset heating range; When the battery temperature meets the preset heating range, control the battery heater to heat the vehicle-mounted battery to a first heating shutdown temperature; Determine whether the charging current is less than a first current threshold; When the charging current is less than the first current threshold, stop the battery heater from continuously heating the vehicle-mounted battery; Wherein, the method further includes: When the charging current is not less than the first current threshold, control the battery heater to continuously heat the vehicle-mounted battery to a second heating shutdown temperature; Determine whether the charging current is less than a second current threshold; When the charging current is less than the second current threshold, stop the battery heater from continuously heating the vehicle-mounted battery.

2. The on-vehicle battery heating control method according to claim 1, wherein The method further includes: When the charging current is not less than the second current threshold, control the battery heater to continuously heat the vehicle-mounted battery to a third heating shutdown temperature.

3. The on-vehicle battery heating control method according to claim 1, characterized in that The method further includes: Determine whether the charging current changes; When the charging current changes, trigger the step of determining whether the battery temperature meets the preset heating range.

4. The vehicle-mounted battery heating control method according to claim 1, characterized in that, The preset heating range is a temperature range greater than the minimum heating start temperature and less than the maximum heating shutdown temperature.

5. The on-vehicle battery heating control method according to claim 2, wherein The first heating shutdown temperature, the second heating shutdown temperature, and the third heating shutdown temperature are calculated based on different charging currents, the current ambient temperature, the battery power, and the optimal charging time.

6. An in-vehicle battery heating control device, characterized in that, The vehicle-mounted battery heating control device includes: A first judgment unit, configured to determine whether the battery temperature meets a preset heating range when the vehicle-mounted battery is charging; A control unit, configured to control the battery heater to heat the vehicle-mounted battery to a first heating shutdown temperature when the battery temperature meets the preset heating range; A second judgment unit, configured to determine whether the charging current is less than a first current threshold; The control unit is further configured to stop the battery heater from continuously heating the vehicle-mounted battery when the charging current is less than the first current threshold; Wherein, the vehicle-mounted battery heating control device further includes: The control unit is further configured to control the battery heater to continuously heat the vehicle-mounted battery to a second heating shutdown temperature when the charging current is not less than the first current threshold; A third judgment unit, configured to determine whether the charging current is less than a second current threshold; The control unit is further configured to stop the battery heater from continuously heating the vehicle-mounted battery when the charging current is less than the second current threshold.

7. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the vehicle-mounted battery heating control method according to any one of claims 1 to 5.

8. A readable storage medium, characterized in that, Computer program instructions are stored in the readable storage medium, and when the computer program instructions are read and run by a processor, the vehicle-mounted battery heating control method according to any one of claims 1 to 5 is executed.

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