Battery discharge cooling method and battery discharge cooling device of hybrid electric vehicle

Abstract

The invention discloses a battery discharge cooling method of a hybrid electric vehicle, which comprises the following steps: starting battery cooling when the actual electric quantity of a battery is lower than a first electric quantity threshold value and the highest temperature of the battery exceeds a first cooling starting threshold value when a power mode is a pure electric mode; when the actual electric quantity of the battery is not lower than the first electric quantity threshold value and the highest temperature of the battery exceeds a second cooling starting threshold value, starting battery cooling; the power mode is a hybrid power mode, and when the actual electric quantity of the battery is lower than a second electric quantity threshold value and the highest temperature of the battery exceeds a third cooling starting threshold value, battery cooling is started; when the actual electric quantity of the battery is not lower than the second electric quantity threshold value and the highest temperature of the battery exceeds a fourth cooling starting threshold value, starting battery cooling; the first cooling starting threshold value > the second cooling starting threshold value > = the third cooling starting threshold value > the fourth cooling starting threshold value. The method can improve the battery energy utilization rate. The invention also discloses a battery discharge cooling device, electronic equipment and a computer readable storage medium.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a battery discharge cooling method for a hybrid electric vehicle, a battery discharge cooling device for a hybrid electric vehicle, an electronic device and a computer-readable storage medium. Background Art

[0002] New energy vehicles are the main direction of transformation and upgrading of the global automotive industry and green development, and are also a strategic choice for the high-quality development of my country's automotive industry. With the implementation of national policies, new energy vehicles are developing rapidly. As the main power source of new energy vehicles, power batteries are of great importance, whether they are pure electric new energy vehicles or hybrid new energy vehicles. Among them, the cruising range and thermal safety issues of new energy vehicles in winter and summer are also the difficulties and pain points of the industry development.

[0003] Thermal management of batteries is one of the important functions of battery management systems, which is mainly to allow the battery to always work within a suitable temperature range and maintain the battery in the best working state, thereby improving the battery cycle life. In the thermal management strategy of the prior art, when the battery is discharging, only the temperature of the battery is detected, and whether to turn on cooling is determined by the temperature of the battery. However, if the battery is at a high temperature but low power, since the energy for turning on thermal management comes from the battery, turning on thermal management at this time can easily lead to over-discharge of the battery cell, that is, the cell voltage is too low, which may trigger the low cell voltage protection, making it difficult to turn on thermal management normally, making it difficult for the battery to work normally, and may also damage the battery. In addition, the prior art method of determining whether to turn on cooling based only on the temperature of the battery also has the problem of low energy utilization. Summary of the invention

[0004] The present invention provides a battery discharge cooling method for a hybrid vehicle to solve the above problems.

[0005] In a first aspect, an embodiment of the present invention discloses a battery discharging cooling method for a hybrid vehicle, comprising:

[0006] Obtaining a power mode of a hybrid vehicle, a maximum battery temperature of a battery in a battery pack of the hybrid vehicle, and an actual battery capacity;

[0007] When the power mode is pure electric mode, when the actual battery power is lower than the first power threshold, if the maximum battery temperature exceeds the first cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the first power threshold, if the maximum battery temperature exceeds the second cooling start threshold, the battery cooling is turned on;

[0008] When the power mode is the hybrid mode, when the actual battery power is lower than the second power threshold, if the maximum battery temperature exceeds the third cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the second power threshold, if the maximum battery temperature exceeds the fourth cooling start threshold, the battery cooling is turned on;

[0009] Among them, the first power threshold is the power corresponding to the battery when it is in the voltage plateau period during the discharge process, and the second power threshold is the power value at which the battery does not have a low power failure; the first cooling start threshold> the second cooling start threshold≥ the third cooling start threshold> the fourth cooling start threshold.

[0010] By adopting the above technical scheme, the battery discharge cooling method of the hybrid electric vehicle of the present invention sets different cooling start thresholds according to the actual battery power in different power modes, including a first cooling start threshold, a second cooling start threshold, a third cooling start threshold and a fourth cooling start threshold, and determines the timing of starting battery cooling in different situations according to different cooling start thresholds, which can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time, so that the battery works in a suitable temperature range, and effectively reduce the risk of battery thermal runaway triggering.

[0011] According to another specific embodiment of the present invention, the first cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure; the second cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk; the third cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk; and the fourth cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk.

[0012] According to another specific embodiment of the present invention, the first power threshold is 10-15% of the total battery power, and / or the second power threshold is 30-100% of the total battery power.

[0013] According to another specific embodiment of the present invention, it also includes:

[0014] After the battery cooling is turned on, when it is detected that the maximum temperature of the battery is not lower than the third cooling temperature threshold, the coolant is controlled to cool the battery at the third water inlet temperature and the third water flow rate;

[0015] When it is detected that the maximum temperature of the battery is not lower than the second cooling temperature threshold, the coolant is controlled to cool the battery at the second water inlet temperature and the second water flow rate;

[0016] When it is detected that the maximum temperature of the battery is not lower than a first cooling temperature threshold, controlling the coolant to cool the battery at a first water inlet temperature and a first water flow rate;

[0017] Among them, the third water inlet temperature < the second water inlet temperature < the first water inlet temperature; the third water flow speed > the second water flow speed > the first water flow speed;

[0018] The first cooling temperature threshold is the lowest temperature at which the battery needs to be cooled; the third cooling temperature threshold>the second cooling temperature threshold>the first cooling temperature threshold.

[0019] According to another specific embodiment of the present invention, the second cooling temperature threshold is the temperature at which the battery has a risk of a battery high temperature warning failure; the third cooling temperature threshold is the temperature at which the battery has a battery high temperature warning failure.

[0020] According to another specific embodiment of the present invention, the first water inlet temperature, the second water inlet temperature and the third water inlet temperature are -40 to 125°C, and / or the first water flow rate, the second water flow rate and the third water flow rate are 0 to 20 L / min.

[0021] According to another specific embodiment of the present invention, it also includes:

[0022] Get the lowest cell voltage of the battery in the battery pack;

[0023] When the power mode is pure electric mode, when the lowest battery cell voltage is lower than the preset battery voltage threshold, if the highest battery temperature exceeds the power switching temperature threshold, the power mode is controlled to switch from pure electric mode to hybrid mode;

[0024] Among them, the battery preset voltage threshold is the voltage value at which the battery does not have a low voltage failure; the power switching temperature threshold is the temperature at which the battery has a risk of a battery high temperature warning failure.

[0025] In a second aspect, an embodiment of the present invention discloses a battery discharge cooling device for a hybrid vehicle, comprising:

[0026] A state acquisition module, used to acquire the power mode of the hybrid vehicle, the maximum battery temperature of the battery in the battery pack of the hybrid vehicle, and the actual battery power;

[0027] A cooling start module is used for starting battery cooling when the power mode is pure electric mode. When the actual battery power is lower than the first power threshold, if the maximum battery temperature exceeds the first cooling start threshold, the battery cooling is started; when the actual battery power is not lower than the first power threshold, if the maximum battery temperature exceeds the second cooling start threshold, the battery cooling is started;

[0028] When the power mode is the hybrid mode, when the actual battery power is lower than the second power threshold, if the maximum battery temperature exceeds the third cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the second power threshold, if the maximum battery temperature exceeds the fourth cooling start threshold, the battery cooling is turned on;

[0029] Among them, the first power threshold is the power corresponding to the battery when it is in the voltage plateau period during the discharge process, and the second power threshold is the power value at which the battery does not have a low power failure; the first cooling start threshold> the second cooling start threshold≥ the third cooling start threshold> the fourth cooling start threshold.

[0030] By adopting the above technical scheme, the battery discharge cooling device of the hybrid vehicle of the present invention sets different cooling start thresholds according to the actual battery power in different power modes, including the first cooling start threshold, the second cooling start threshold, the third cooling start threshold and the fourth cooling start threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start thresholds, which can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time, so that the battery works in a suitable temperature range, and effectively reduce the risk of battery thermal runaway triggering.

[0031] In a third aspect, an embodiment of the present invention discloses an electronic device, including a processor and a memory, wherein the memory stores at least one instruction, and when the at least one instruction is executed by the processor, the battery discharge cooling method of the hybrid vehicle in any of the aforementioned embodiments is implemented.

[0032] By adopting the above technical solution, the electronic device sets different cooling start-up thresholds according to the actual battery power in different power modes, including the first cooling start-up threshold, the second cooling start-up threshold, the third cooling start-up threshold and the fourth cooling start-up threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start-up thresholds. This can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time to make the battery work in a suitable temperature range, effectively reducing the risk of triggering battery thermal runaway.

[0033] In a fourth aspect, an embodiment of the present invention discloses a computer-readable storage medium, in which at least one instruction is stored. When the at least one instruction is executed, the battery discharge cooling method of the hybrid vehicle in any of the aforementioned embodiments is implemented.

[0034] By adopting the above technical solution, the computer-readable storage medium sets different cooling start-up thresholds according to the actual battery power in different power modes, including the first cooling start-up threshold, the second cooling start-up threshold, the third cooling start-up threshold and the fourth cooling start-up threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start-up thresholds. This can maximize the battery energy utilization rate, reduce the loss to the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time to make the battery work in a suitable temperature range, effectively reducing the risk of triggering battery thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram showing the process of the battery discharging cooling method of a hybrid vehicle in an embodiment of the present invention Figure 1 ;

[0036] Figure 2 Schematic diagram showing the process of the battery discharging cooling method of a hybrid vehicle in an embodiment of the present invention Figure 2 ;

[0037] Figure 3 A schematic diagram showing the structure of a battery discharge cooling device for a hybrid vehicle in an embodiment of the present invention;

[0038] Figure 4 A schematic structural diagram of an electronic device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0042] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] The inventors carefully studied the prior art and found that the prior art usually only focuses on the battery temperature in terms of battery thermal management, especially battery cooling, and only determines whether to turn on battery cooling based on the battery temperature, which is easy to damage the battery and has low battery energy utilization. The inventors hope to solve the above problems.

[0045] First, refer to Figure 1 The present invention provides a battery discharge cooling method for a hybrid vehicle, comprising the following steps:

[0046] S1: obtaining a power mode of a hybrid vehicle, a maximum battery temperature of a battery in a battery pack of the hybrid vehicle, and an actual battery capacity.

[0047] In S2: When the power mode is pure electric mode, execute step S21 or S22. S21: When the actual battery power is lower than the first power threshold, if the maximum battery temperature exceeds the first cooling start threshold, turn on the battery cooling. S22: When the actual battery power is not lower than the first power threshold, if the maximum battery temperature exceeds the second cooling start threshold, turn on the battery cooling.

[0048] Among them, the pure electric mode is the EV mode. In the pure electric mode, the wheels of the hybrid vehicle are driven entirely by the electric motor. When the power mode of the hybrid vehicle is the pure electric mode, it means that the discharge working mode of the whole vehicle is the pure electric mode, and the battery of the hybrid vehicle is in a discharge mode that matches the pure electric mode.

[0049] In S3: When the power mode is the hybrid power mode, execute step S31 or S32. S31: When the actual battery power is lower than the second power threshold, if the battery maximum temperature exceeds the third cooling start threshold, turn on the battery cooling. S32: When the actual battery power is not lower than the second power threshold, if the battery maximum temperature exceeds the fourth cooling start threshold, turn on the battery cooling.

[0050] Among them, the hybrid mode is the HEV mode, which is a mode that uses the traditional internal combustion engine as the main drive and the electric motor as the auxiliary drive. When the vehicle starts or stops, the vehicle speed is low and it is driven only by the electric motor. When the necessary working conditions are not met, the vehicle's engine will not work. When the power mode of a hybrid vehicle is the hybrid mode, it means that the discharge working mode of the whole vehicle is the hybrid mode, and the battery of the hybrid vehicle is in a discharge mode that matches the hybrid mode.

[0051] The first power threshold is the power level corresponding to when the battery is in the voltage plateau period during the discharge process. The second power threshold is the power level at which the battery does not have a low power failure. The first power threshold is lower than the second power threshold. More specifically, the second power threshold is higher than the low power failure threshold, and the low power failure threshold represents the power level at which the battery has a low power failure. Further, the first power threshold and the second power threshold can be adjusted accordingly according to the actual battery performance and the performance of the battery cells in the battery. In addition, the first cooling start threshold>the second cooling start threshold≥the third cooling start threshold>the fourth cooling start threshold.

[0052] Specifically, when the power mode is pure electric mode, when the actual battery power is low, within the allowable temperature range, a higher temperature threshold for starting cooling (i.e., a high first cooling threshold) is set, so that the battery's thermal management is relatively difficult to start, which helps to prioritize vehicle operation. When the actual battery power is high, a lower temperature threshold for starting cooling (i.e., a low second cooling threshold, which is less than the first cooling threshold) can be set, so that the battery's thermal management is relatively easy to start, which helps to prioritize the battery's operation at a suitable temperature.

[0053] When the power mode is hybrid mode, the internal combustion engine intervenes in the work, and the internal combustion engine is the main drive, and the electric motor is the auxiliary drive. When the actual battery power is low, in order to prevent the internal combustion engine and the electric motor from switching frequently, a higher temperature threshold for starting cooling can be set (that is, the third cooling start threshold is high), so that the thermal management of the battery is relatively difficult to turn on. When the actual battery power is high, a lower temperature threshold for starting cooling can be set (that is, the fourth cooling start threshold is low, and the fourth cooling start threshold is less than the third cooling start threshold), so that the thermal management of the battery is relatively easy to turn on, which helps to prioritize the battery to work at an appropriate temperature.

[0054] By adopting the above technical scheme, the battery discharge cooling method of the hybrid electric vehicle of the present invention comprehensively considers the driving conditions of the whole vehicle, the battery temperature and the power status, and sets different cooling start thresholds according to the actual battery power status in different power modes, including the first cooling start threshold, the second cooling start threshold, the third cooling start threshold and the fourth cooling start threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start thresholds, which can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time, so that the battery works in a suitable temperature range, and effectively reduce the risk of battery thermal runaway triggering.

[0055] Further, in the above embodiment, the first cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure, the second cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk, the third cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk, and the fourth cooling start-up threshold is the temperature at which the battery has a battery high temperature warning failure risk.

[0056] More specifically, when the battery of a hybrid vehicle is working, the temperature of the battery can generally be divided into normal temperature T0, high temperature T1 where the battery can still work normally, high temperature T2 where the battery has a high temperature warning fault risk, and severe high temperature T3 where the battery will have a high temperature fault, and T0<T1<T2<T3. Among them, the high temperature warning fault risk of the battery means that the temperature of the battery at this time has exceeded the temperature range in which the battery can work normally and safely, and the temperature of the battery is close to but has not yet reached the critical temperature that will cause battery damage or serious performance degradation. At this time, an alarm can be issued to remind the user or the battery management system to take preventive measures. High temperature fault means that the battery temperature is too high, which will cause battery damage or serious performance degradation. If the battery heats up further, it may even cause an accident. T2≤first cooling start threshold<T3, T1≤second cooling start threshold<T2, T1≤third cooling start threshold<T2, T1≤fourth cooling start threshold<T2. Exemplarily, when the battery is a lithium iron phosphate battery, the first cooling start threshold, the second cooling start threshold, the third cooling start threshold and the fourth cooling start threshold can be set in the range of 30-60℃. When the battery is of other types, the first cooling-on threshold, the second cooling-on threshold, the third cooling-on threshold, and the fourth cooling-on threshold may be set according to actual battery performance.

[0057] Furthermore, in the above embodiments, the first power threshold is 10-15% of the total battery power (i.e., the total battery SOC). The second power threshold is 30-100% of the total battery power (i.e., the total battery SOC). The first power threshold and the second power threshold can be set according to the performance and type of the actual battery.

[0058] Furthermore, in each of the above embodiments, the battery discharge cooling method of a hybrid vehicle also includes: after turning on battery cooling, when it is detected that the maximum temperature of the battery is not lower than a third cooling temperature threshold, controlling the coolant to cool the battery with a third water inlet temperature and a third water flow rate; when it is detected that the maximum temperature of the battery is not lower than the second cooling temperature threshold, controlling the coolant to cool the battery with a second water inlet temperature and a second water flow rate; when it is detected that the maximum temperature of the battery is not lower than the first cooling temperature threshold, controlling the coolant to cool the battery with a first water inlet temperature and a first water flow rate.

[0059] The third water inlet temperature is less than the second water inlet temperature and less than the first water inlet temperature, and the third water flow rate is greater than the second water flow rate and greater than the first water flow rate. The first cooling temperature threshold is the lowest temperature at which the battery needs to be cooled. The third cooling temperature threshold is greater than the second cooling temperature threshold and greater than the first cooling temperature threshold.

[0060] By adopting the above technical solution, after turning on the cooling, the water inlet temperature and water flow rate during cooling are comprehensively considered and adjusted in stages. The water inlet temperature and water flow rate are adjusted in stages according to the actual temperature of the battery. This helps to allocate the energy of the whole vehicle to make the electrical performance of the whole vehicle better, help to improve energy utilization, and make energy distribution more reasonable.

[0061] Exemplarily, the first water inlet temperature, the second water inlet temperature and the third water inlet temperature are -40 to 125°C. The first water flow rate, the second water flow rate and the third water flow rate are 0 to 20L / min. Among them, when cooling the battery, the coolant enters the water flow channel through the water inlet and flows through the battery to cool the battery. The water inlet temperature can actually be equivalent to the temperature of the coolant flowing into the water flow channel. When the battery temperature is high, setting a relatively low water inlet temperature (the set water inlet temperature is lower than the maximum temperature of the battery) and a relatively high water flow rate can help to take away the heat of the battery faster, so that the battery can be cooled quickly, achieve rapid cooling, reduce the risk of further heating of the battery, and protect the battery. After the battery temperature is reduced, the water inlet temperature can be increased accordingly and the water flow rate can be reduced to reduce the energy consumption of cooling and improve energy utilization. Furthermore, the water flow rate can be adapted and adjusted according to the actual compressor power of the vehicle and the parameters of the specific compressor, and the water inlet temperature can be adapted and adjusted accordingly according to the performance of the battery.

[0062] Further, the second cooling temperature threshold is a temperature at which the battery has a risk of a battery high temperature warning failure, and the third cooling temperature threshold is a temperature at which the battery has a battery high temperature warning failure.

[0063] Exemplarily, when the battery of a hybrid vehicle is working, the temperature of the battery can be divided into normal temperature T0, high temperature T1 where the battery can still work normally, high temperature T2 where the battery has a high temperature warning fault risk, and severe high temperature T3 where the battery will have a high temperature fault, and T0<T1<T2<T3, then T0≤first cooling temperature threshold<T1, T1≤second cooling temperature threshold<T2, T2≤third cooling temperature threshold<T3. Among them, when the battery is a lithium iron phosphate battery, the first cooling temperature threshold, the second cooling temperature threshold and the third cooling temperature threshold can be set within the range of 30-60℃. When the battery is of other types, the first cooling temperature threshold, the second cooling temperature threshold and the third cooling temperature threshold can be set according to the actual performance of the battery.

[0064] Further, in the above embodiments, reference is made to Figure 2 , the battery discharge cooling method of the hybrid vehicle also includes:

[0065] S01: Obtain the lowest cell voltage of the batteries in the battery pack.

[0066] S02: When the power mode is pure electric mode, when the lowest cell voltage of the battery is lower than the preset voltage threshold of the battery, if the highest temperature of the battery exceeds the power switching temperature threshold, the power mode is controlled to switch from pure electric mode to hybrid power mode.

[0067] Among them, the battery preset voltage threshold is the voltage value at which the battery does not have a low voltage failure. Exemplarily, the battery preset voltage threshold is 10-15% of the total battery power (i.e., the total battery SOC). The battery preset voltage threshold can be set more specifically according to the performance and type of the actual battery. The power switching temperature threshold is the temperature at which the battery is at risk of a battery high temperature alarm failure. Exemplarily, T1≤power switching temperature threshold<T2. When the battery is a lithium iron phosphate battery, the power switching temperature threshold can be set in the range of 30-60°C. When the battery is of other types, the power switching temperature threshold can be set according to the performance of the actual battery.

[0068] By detecting the voltage and temperature of the battery, it helps to switch the power mode in time, thereby improving energy utilization and reducing damage to the battery.

[0069] Furthermore, after cooling has been turned on, the battery power becomes low and the battery's lowest cell voltage is lower than the battery's preset voltage threshold. If the vehicle was originally in pure electric mode, the vehicle's power mode is switched to hybrid mode. At this time, keeping cooling turned on helps to extend the battery life, improve energy utilization, and ensure the operation of the vehicle.

[0070] In the above embodiments, the battery discharge cooling method of the hybrid vehicle of the present invention comprehensively considers the different power modes of the hybrid vehicle, the battery power and temperature, and the water inlet temperature and water flow rate after cooling is turned on, formulates a battery discharge thermal management strategy, can comprehensively monitor the temperature and voltage of the battery, and effectively reduce the risk of thermal runaway triggering, so as to ensure that the battery works within a reasonable temperature range, escort the safe driving of the whole vehicle, and at the same time improve the battery energy utilization rate, extend the battery life, optimize the energy consumption of the whole vehicle, improve the comprehensive endurance of the whole vehicle, and help to perform efficient energy management control. Hybrid vehicles can be, for example, plug-in hybrid, extended range, hydrogen-electric hybrid vehicles, and the temperature threshold, power threshold, water inlet temperature, water flow rate and other parameters involved in the battery discharge cooling method of the hybrid vehicle can be adjusted and set accordingly according to actual needs.

[0071] Second, refer to Figure 3 The embodiment of the present invention discloses a battery discharging cooling device 1 for a hybrid vehicle, which performs discharging cooling by the battery discharging cooling method for a hybrid vehicle in any of the above embodiments. The battery discharging cooling device 1 for a hybrid vehicle comprises a state acquisition module 11 and a cooling start module 12.

[0072] The state acquisition module 11 is connected to the cooling start module 12 .

[0073] Continue to refer Figure 3 The state acquisition module 11 is used to acquire the power mode of the hybrid vehicle, the maximum battery temperature of the batteries in the battery pack of the hybrid vehicle, and the actual battery power.

[0074] The cooling start-up module 12 is used in the case where the power mode is the pure electric mode. When the actual battery power is lower than the first power threshold, if the maximum battery temperature exceeds the first cooling start-up threshold, the battery cooling is turned on; when the actual battery power is not lower than the first power threshold, if the maximum battery temperature exceeds the second cooling start-up threshold, the battery cooling is turned on; when the power mode is the hybrid power mode, when the actual battery power is lower than the second power threshold, if the maximum battery temperature exceeds the third cooling start-up threshold, the battery cooling is turned on; when the actual battery power is not lower than the second power threshold, if the maximum battery temperature exceeds the fourth cooling start-up threshold, the battery cooling is turned on.

[0075] Among them, the first power threshold is the power corresponding to the battery when it is in the voltage plateau period during the discharge process, and the second power threshold is the power value at which the battery does not have a low power failure; the first cooling start threshold> the second cooling start threshold≥ the third cooling start threshold> the fourth cooling start threshold.

[0076] By adopting the above technical scheme, the battery discharge cooling device 1 of the hybrid vehicle of the present invention sets different cooling start thresholds according to the actual battery power in different power modes, including a first cooling start threshold, a second cooling start threshold, a third cooling start threshold and a fourth cooling start threshold, and determines the timing of starting battery cooling in different situations according to different cooling start thresholds, which can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time, so that the battery works in a suitable temperature range, and effectively reduce the risk of battery thermal runaway triggering.

[0077] Furthermore, the battery discharging and cooling device 1 of the hybrid electric vehicle further includes a power switching module (not shown in the figure) for executing the aforementioned steps S01 and S02.

[0078] The battery discharge cooling device 1 of the hybrid vehicle also includes a cooling module (not shown in the figure), which is used to control the coolant to cool the battery with the third water inlet temperature and the third water flow rate when the battery maximum temperature is detected to be not lower than the third cooling temperature threshold after the battery cooling is turned on; when the battery maximum temperature is detected to be not lower than the second cooling temperature threshold, the coolant is controlled to cool the battery with the second water inlet temperature and the second water flow rate; when the battery maximum temperature is detected to be not lower than the first cooling temperature threshold, the coolant is controlled to cool the battery with the first water inlet temperature and the first water flow rate.

[0079] The third water inlet temperature is less than the second water inlet temperature and less than the first water inlet temperature; the third water flow rate is greater than the second water flow rate and greater than the first water flow rate. The first cooling temperature threshold is the lowest temperature at which the battery needs to be cooled; the third cooling temperature threshold is greater than the second cooling temperature threshold and greater than the first cooling temperature threshold.

[0080] Thirdly, reference Figure 4 The embodiment of the present invention discloses an electronic device 2, including a processor 22 and a memory 21, wherein the memory 21 stores at least one instruction, and when the at least one instruction is executed by the processor 22, the battery discharge cooling method of the hybrid vehicle in any of the above embodiments is implemented. The memory 21 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0081] By adopting the above technical solution, the electronic device sets different cooling start-up thresholds according to the actual battery power in different power modes, including the first cooling start-up threshold, the second cooling start-up threshold, the third cooling start-up threshold and the fourth cooling start-up threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start-up thresholds. This can maximize the battery energy utilization rate, reduce the loss of the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and can also monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time to make the battery work in a suitable temperature range, effectively reducing the risk of triggering battery thermal runaway.

[0082] In a fourth aspect, an embodiment of the present invention discloses a computer-readable storage medium, in which at least one instruction is stored. When the at least one instruction is executed, the battery discharge cooling method of the hybrid vehicle in any of the aforementioned embodiments is implemented.

[0083] By adopting the above technical solution, the computer-readable storage medium sets different cooling start-up thresholds according to the actual battery power in different power modes, including the first cooling start-up threshold, the second cooling start-up threshold, the third cooling start-up threshold and the fourth cooling start-up threshold, and determines the timing of starting battery cooling in different situations according to the different cooling start-up thresholds. This can maximize the battery energy utilization rate, reduce the loss to the battery, extend the battery life, optimize the energy consumption of the whole vehicle to improve the comprehensive endurance, and monitor the actual battery power and the maximum battery temperature, and start the battery cooling in time to make the battery work in a suitable temperature range, effectively reducing the risk of triggering battery thermal runaway.

[0084] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0085] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0086] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0087] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0088] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery discharging cooling method for a hybrid vehicle, characterized in that: include: Acquiring a power mode of the hybrid electric vehicle, a maximum battery temperature of batteries in a battery pack of the hybrid electric vehicle, and an actual battery power; When the power mode is the pure electric mode, when the actual battery power is lower than the first power threshold, if the maximum battery temperature exceeds the first cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the first power threshold, if the maximum battery temperature exceeds the second cooling start threshold, the battery cooling is turned on; When the power mode is the hybrid power mode, when the actual battery power is lower than the second power threshold, if the maximum battery temperature exceeds the third cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the second power threshold, if the maximum battery temperature exceeds the fourth cooling start threshold, the battery cooling is turned on; Among them, the first power threshold is the power corresponding to the battery when it is in the voltage plateau period during the discharge process, the second power threshold is the power value of the battery without a low power failure; the first cooling start threshold>the second cooling start threshold≥the third cooling start threshold>the fourth cooling start threshold.

2. The battery discharging cooling method according to claim 1, characterized in that: The first cooling start threshold is the temperature at which the battery has a battery high temperature warning failure; the second cooling start threshold is the temperature at which the battery has a battery high temperature warning failure risk; the third cooling start threshold is the temperature at which the battery has a battery high temperature warning failure risk; and the fourth cooling start threshold is the temperature at which the battery has a battery high temperature warning failure risk.

3. The battery discharging cooling method according to claim 1, characterized in that: The first power threshold is 10-15% of the total battery power, and / or the second power threshold is 30-100% of the total battery power.

4. The battery discharging cooling method according to claim 1, characterized in that: Also includes: After the battery cooling is turned on, when it is detected that the maximum temperature of the battery is not lower than a third cooling temperature threshold, the coolant is controlled to cool the battery at a third water inlet temperature and a third water flow rate; When it is detected that the maximum temperature of the battery is not lower than a second cooling temperature threshold, controlling the coolant to cool the battery at a second water inlet temperature and a second water flow rate; When it is detected that the maximum temperature of the battery is not lower than a first cooling temperature threshold, controlling the coolant to cool the battery at a first water inlet temperature and a first water flow rate; Wherein, the third water inlet temperature < the second water inlet temperature < the first water inlet temperature; the third water flow speed > the second water flow speed > the first water flow speed; The first cooling temperature threshold is the lowest temperature at which the battery needs to be cooled; the third cooling temperature threshold>the second cooling temperature threshold>the first cooling temperature threshold.

5. The battery discharging cooling method according to claim 4, characterized in that: The second cooling temperature threshold is a temperature at which the battery has a risk of a battery high temperature warning failure; and the third cooling temperature threshold is a temperature at which the battery has a battery high temperature warning failure.

6. The battery discharging cooling method according to claim 4, characterized in that: The first water inlet temperature, the second water inlet temperature and the third water inlet temperature are -40 to 125°C, and / or the first water flow rate, the second water flow rate and the third water flow rate are 0 to 20 L / min.

7. The battery discharging cooling method according to claim 1, characterized in that: Also includes: Obtaining the lowest cell voltage of the batteries in the battery pack; In the case where the power mode is the pure electric mode, when the lowest cell voltage of the battery is lower than a preset battery voltage threshold, if the highest temperature of the battery exceeds a power switching temperature threshold, the power mode is controlled to switch from the pure electric mode to the hybrid power mode; The preset battery voltage threshold is a voltage value at which the battery does not have a low voltage fault; The power switching temperature threshold is a temperature at which the battery has a risk of a battery high temperature warning failure.

8. A battery discharge cooling device for a hybrid vehicle, characterized in that: include: A state acquisition module, used to acquire the power mode of the hybrid electric vehicle, the maximum battery temperature of the batteries in the battery pack of the hybrid electric vehicle, and the actual battery power; A cooling start module, used for starting battery cooling when the actual battery power is lower than a first power threshold and the maximum battery temperature exceeds a first cooling start threshold when the power mode is the pure electric mode; and starting battery cooling when the actual battery power is not lower than the first power threshold and the maximum battery temperature exceeds a second cooling start threshold when the power mode is the pure electric mode; When the power mode is the hybrid power mode, when the actual battery power is lower than the second power threshold, if the maximum battery temperature exceeds the third cooling start threshold, the battery cooling is turned on; when the actual battery power is not lower than the second power threshold, if the maximum battery temperature exceeds the fourth cooling start threshold, the battery cooling is turned on; Among them, the first power threshold is the power corresponding to the battery when it is in the voltage plateau period during the discharge process, the second power threshold is the power value of the battery without a low power failure; the first cooling start threshold>the second cooling start threshold≥the third cooling start threshold>the fourth cooling start threshold.

9. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory stores at least one instruction, and when the at least one instruction is executed by the processor, the battery discharge cooling method for a hybrid vehicle as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction, and when the at least one instruction is executed, the battery discharging cooling method for a hybrid vehicle according to any one of claims 1 to 7 is implemented.

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