Battery Temperature Management Method, Device, Equipment and Readable Storage Medium

Abstract

The present invention provides a battery temperature management method, device, equipment and readable storage medium. The method includes: when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy are adopted according to the refrigeration request; if the battery thermal management controller receives a heating request, the heater adjustment power is determined based on the battery required water temperature and the battery inlet water temperature, and the heater power is adjusted according to the heater adjustment power. Through the present invention, it is ensured that the battery always operates within a reasonable temperature range, and the service life of the battery is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly to a battery temperature management method, device, equipment and readable storage medium. Background Art

[0002] When the battery drives high-power equipment, such as the turning on of the air conditioner during the driving of a car, it will cause the battery temperature to be relatively high, while when the car is in a cold region, the battery temperature will be relatively low. When the battery is higher than the maximum operating temperature or lower than the minimum operating temperature, the service life of the battery will be shortened. How to ensure that the battery works within a reasonable temperature range so as to guarantee the service life of the battery is a technical problem that needs to be solved urgently. Summary of the Invention

[0003] The main purpose of the present invention is to provide a battery temperature management method, device, equipment and readable storage medium, aiming to ensure that the battery works within a reasonable temperature range.

[0004] In a first aspect, the present invention provides a battery temperature management method, and the battery temperature management method includes:

[0005] When the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy are adopted according to the refrigeration request;

[0006] If the battery thermal management controller receives a heating request, the heater adjustment power is determined based on the battery required water temperature and the battery inlet water temperature, and the heater power is adjusted according to the heater adjustment power.

[0007] Optionally, when the refrigeration request is a battery single refrigeration request, the step of adopting corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the refrigeration request includes:

[0008] Every second preset time interval, the actual evaporation temperature value is subtracted from the target evaporation temperature value to obtain a second difference;

[0009] The compressor adjustment strategy corresponding to the second difference is determined, and the compressor speed is adjusted according to the compressor adjustment strategy;

[0010] Every third preset time interval, the refrigerant temperature is subtracted from the saturation temperature corresponding to the refrigerant pressure to obtain a first superheat degree;

[0011] If the first superheat degree is greater than or equal to the first preset temperature, it is determined that the adjusted opening of the electronic expansion valve is the current opening of the electronic expansion valve plus the first preset degree, and the first preset degree is increased on the basis of the current opening of the electronic expansion valve;

[0012] If the first superheat degree is less than or equal to the second preset temperature, determine that the adjusted opening degree of the electronic expansion valve is to reduce the opening degree of the electronic expansion valve by a first preset degree, and reduce the first preset degree on the basis of the current opening degree of the electronic expansion valve, where the first preset temperature is greater than the second preset temperature.

[0013] Optionally, when the refrigeration request is a dual refrigeration request for the cab and the battery, the step of adopting corresponding compressor speed adjustment strategies and electronic expansion valve opening degree adjustment strategies according to the refrigeration request includes:

[0014] Detect the working state of the battery, and determine the target evaporation temperature value according to the detection result;

[0015] After increasing the preset speed based on the current speed of the compressor, every first preset time interval, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a third difference;

[0016] Determine the compressor adjustment strategy corresponding to the third difference, and adjust the compressor speed according to the compressor adjustment strategy;

[0017] Every third preset time interval, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain a second superheat degree;

[0018] Determine the corresponding electronic expansion valve opening degree adjustment strategy according to the second superheat degree, and adjust the opening degree of the electronic expansion valve according to the electronic expansion valve opening degree adjustment strategy.

[0019] Optionally, the step of determining the corresponding electronic expansion valve opening degree adjustment strategy according to the second superheat degree includes:

[0020] If the second superheat degree is greater than the third preset temperature, detect whether the compressor speed is the maximum speed;

[0021] If the compressor speed is the maximum speed, compare the actual evaporation temperature value with the target evaporation temperature value;

[0022] If the actual evaporation temperature value is less than the target evaporation temperature value, determine that the adjusted opening degree of the electronic expansion valve is to increase the opening degree of the electronic expansion valve by a first preset degree;

[0023] If the actual evaporation temperature value is greater than the sum of the target evaporation temperature value and the second preset degree, determine that the adjusted opening degree of the electronic expansion valve is to reduce the opening degree of the electronic expansion valve by a first preset degree;

[0024] If the compressor speed is not the maximum speed, compare the battery inlet water temperature with the battery required water temperature;

[0025] If the battery inlet water temperature is greater than the sum of the battery required water temperature and the second preset degree, determine that the adjusted opening degree of the electronic expansion valve is to increase the opening degree of the electronic expansion valve by a first preset degree;

[0026] If the imported water temperature of the battery is less than the sum of the required water temperature of the battery minus the second preset degree, it is determined that the adjusted opening degree of the electronic expansion valve is to reduce the opening degree of the electronic expansion valve by the first preset degree;

[0027] If the second superheat degree is less than or equal to the third preset temperature, it is determined that the adjusted opening degree of the electronic expansion valve is to reduce the opening degree of the electronic expansion valve by the first preset degree.

[0028] Optionally, the step of determining the adjusted power of the heater based on the required water temperature of the battery and the imported water temperature of the battery includes:

[0029] Every fourth preset time interval, subtract the imported water temperature of the battery from the required water temperature of the battery to obtain a fourth difference;

[0030] Determine the adjusted power of the heater corresponding to the fourth difference according to the corresponding relationship between the temperature difference and the calibrated adjusted power of the heater.

[0031] Optionally, the battery thermal management method further includes:

[0032] When the battery thermal management controller receives a single refrigeration request from the cab, every first preset time interval, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a first difference;

[0033] Determine the compressor speed adjustment strategy corresponding to the first difference.

[0034] Optionally, the battery temperature management method further includes:

[0035] If a fault occurs in the battery thermal management controller, activate the fault protection measure corresponding to the fault.

[0036] In a second aspect, the present invention further provides a battery temperature management device, and the battery temperature management device includes:

[0037] A refrigeration request management module, configured to, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, adopt a corresponding compressor speed adjustment strategy and an electronic expansion valve opening degree adjustment strategy according to the refrigeration request;

[0038] A heating request management module, configured to, if the battery thermal management controller receives a heating request, determine the adjusted power of the heater based on the required water temperature of the battery and the imported water temperature of the battery, and adjust the heater power according to the adjusted power of the heater.

[0039] In a third aspect, the present invention further provides a battery temperature management device, which includes a processor, a memory, and a battery temperature management program stored on the memory and executable by the processor. When the battery temperature management program is executed by the processor, the steps of the battery temperature management method described above are implemented.

[0040] In a fourth aspect, the present invention further provides a readable storage medium, on which a battery temperature management program is stored. When the battery temperature management program is executed by a processor, the steps of the battery temperature management method described above are implemented.

[0041] In the present invention, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, a corresponding compressor speed adjustment strategy and an electronic expansion valve opening adjustment strategy are adopted according to the refrigeration request; if the battery thermal management controller receives a heating request, the heater adjustment power is determined based on the battery required water temperature and the battery inlet water temperature, and the heater power is adjusted according to the heater adjustment power. Through the present invention, when the battery thermal management controller has no fault and the battery thermal management controller receives a refrigeration request, the adjustment and distribution of the refrigeration power are realized by adjusting the compressor speed and the opening of the electronic expansion valve, or, when the battery thermal management controller receives a heating request, the adjustment and distribution of the heating power are realized by adjusting the heater power, so as to ensure that the battery always works within a reasonable temperature range, thereby guaranteeing the service life of the battery. Description of the Drawings

[0042] Figure 1 It is a schematic diagram of the hardware structure of the battery temperature management device involved in the embodiment scheme of the present invention;

[0043] Figure 2 It is a schematic flowchart of an embodiment of the battery temperature management method of the present invention;

[0044] Figure 3a It is a schematic flowchart of the compressor speed adjustment strategy corresponding to the single battery refrigeration request in the battery temperature management method of the present invention;

[0045] Figure 3b It is a schematic flowchart of the electronic expansion valve opening adjustment strategy corresponding to the single battery refrigeration request in the battery temperature management method of the present invention;

[0046] Figure 4a It is a schematic flowchart of the compressor speed adjustment strategy corresponding to the double refrigeration requests of the cab and the battery in the battery temperature management method of the present invention;

[0047] Figure 4b It is a schematic flowchart of the electronic expansion valve opening adjustment strategy corresponding to the double refrigeration requests of the cab and the battery in the battery temperature management method of the present invention;

[0048] Figure 4c is Figure 4b a detailed flowchart diagram of step S114 in

[0049] Figure 5 is a schematic diagram of the functional modules of an embodiment of the battery temperature management device of the present invention.

[0050] The implementation, functional features, and advantages of the objectives of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0051] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] In a first aspect, an embodiment of the present invention provides a battery temperature management device, which may be a device with data processing functions such as a personal computer (PC), a laptop computer, a server, etc.

[0053] Referring to Figure 1 , Figure 1 is a schematic diagram of the hardware structure of the battery temperature management device involved in the embodiment of the present invention. In the embodiment of the present invention, the battery temperature management device may include a processor 1001 (such as a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components; the user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM), or it may be a stable memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally also be a storage device independent of the aforementioned processor 1001. Those skilled in the art can understand that Figure 1 the hardware structure shown in

[0054] Continuing to refer to Figure 1 , Figure 1In the memory 1005 as a computer storage medium, an operating system, a network communication module, a user interface module, and a battery temperature management program may be included. Among them, the processor 1001 may call the battery temperature management program stored in the memory 1005 and execute the battery temperature management method provided by the embodiments of the present invention.

[0055] In a second aspect, an embodiment of the present invention provides a battery temperature management method.

[0056] In one embodiment, referring to Figure 2 , Figure 2 is a schematic flowchart of an embodiment of the battery temperature management method of the present invention. As Figure 2 shown, the battery temperature management method includes:

[0057] Step S10, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, then adopt corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the refrigeration request;

[0058] In this embodiment, after the battery thermal management controller is started and powered on, it performs self-check to check whether there is a fault. If the battery thermal management controller has no fault, the battery thermal management controller adopts corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the received refrigeration request.

[0059] Step S20, if the battery thermal management controller receives a heating request, then determine the heater adjustment power based on the battery required water temperature and the battery inlet water temperature, and adjust the heater power according to the heater adjustment power.

[0060] In this embodiment, the heating request is a battery heating request. If the battery thermal management controller receives a battery heating request, then determine the heater adjustment power based on the battery required water temperature and the battery inlet water temperature, and then increase or decrease the heater power based on the current heater power according to the heater adjustment power.

[0061] Further, in one embodiment, the step of determining the heater adjustment power based on the battery required water temperature and the battery inlet water temperature includes:

[0062] Every fourth preset time period, subtract the battery inlet water temperature from the battery required water temperature to obtain a fourth difference;

[0063] Determine the heater adjustment power corresponding to the fourth difference according to the correspondence between the temperature difference and the calibrated heater adjustment power.

[0064] In this embodiment, every fourth preset time interval, the battery required water temperature is subtracted from the battery inlet water temperature to obtain a fourth difference. According to the correspondence between the temperature difference and the calibrated heater adjustment power, the heater adjustment power corresponding to the fourth difference is determined, that is, the heater power is adjusted once every fourth preset time interval. Specifically, if the fourth difference is greater than 3, the heater adjustment power is to increase the heater power by 300 W; if the fourth difference is greater than 1 and less than or equal to 3, the heater adjustment power is to increase the heater power by 150 W; if the fourth difference is greater than or equal to 0 and less than or equal to 1, the heater adjustment power is 0; if the fourth difference is greater than or equal to -3 and less than 0, the heater adjustment power is to decrease the heater power by 250 W; if the fourth difference is less than -3, the heater adjustment power is to decrease the heater power by 300 W. By adjusting the heater power, the temperature is adjusted, thereby ensuring that the battery operates within a reasonable temperature range.

[0065] It should be noted that the output of the heater power is less than or equal to the maximum set power and greater than or equal to the minimum set power. Taking the maximum set power of the heater as 5000 W and the minimum set power of the heater as 1000 W as an example, if the current power of the heater is 4800 W and the heater adjustment power is to increase the heater power by 300 W, then the output power of the heater is 5000 W. If the current power of the heater is 1200 W and the heater adjustment power is to decrease the heater power by 300 W, then the output power of the heater is 1000 W. It is easy to think that the parameters in this embodiment are for reference only and are not limited here.

[0066] In this embodiment, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, a corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy are adopted according to the refrigeration request; if the battery thermal management controller receives a heating request, the heater adjustment power is determined based on the battery required water temperature and the battery inlet water temperature, and the heater power is adjusted according to the heater adjustment power. Through this embodiment, when the battery thermal management controller has no fault and the battery thermal management controller receives a refrigeration request, the adjustment and distribution of the refrigeration power are realized by adjusting the compressor speed and the opening of the electronic expansion valve, or, when the battery thermal management controller receives a heating request, the adjustment and distribution of the heating power are realized by adjusting the heater power, thereby ensuring that the battery always operates within a reasonable temperature range, and further ensuring the service life of the battery.

[0067] Further, in one embodiment, referring to Figure 3a , Figure 3a is a schematic flow chart of the compressor speed adjustment strategy corresponding to the single refrigeration request of the battery temperature management method of the present invention. Referring to Figure 3b , Figure 3bThis is a schematic flowchart of the opening adjustment strategy of the electronic expansion valve corresponding to the single battery cooling request in the battery temperature management method of the present invention. As Figure 3a and Figure 3b shown, when the cooling request is a single battery cooling request, the steps of adopting the corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the cooling request include:

[0068] Step S101, every second preset time interval, subtract the target evaporation temperature value from the actual evaporation temperature value to obtain a second difference;

[0069] Step S102, determine the compressor adjustment strategy corresponding to the second difference, and adjust the compressor speed according to the compressor adjustment strategy;

[0070] Step S103, every third preset time interval, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain a first superheat degree;

[0071] Step S104, if the first superheat degree is greater than or equal to the first preset temperature, determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by the first preset degree, and increase the opening by the first preset degree on the basis of the current opening of the electronic expansion valve;

[0072] Step S105, if the first superheat degree is less than or equal to the second preset temperature, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by the first preset degree, and decrease the opening by the first preset degree on the basis of the current opening of the electronic expansion valve, where the first preset temperature is greater than the second preset temperature.

[0073] In this embodiment, taking the second preset time interval as 20s as an example, every 20s, calculate the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure, and record the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure every 20s when the single battery cooling request is made as the second difference. Determine the compressor adjustment strategy corresponding to the second difference, and adjust the compressor speed according to the compressor adjustment strategy. Specifically, after the compressor starts from the initial speed of 3000rpm, if the second difference is greater than 3, the compressor speed is increased by 300rpm on the basis of the current speed; if the second difference is greater than 1 and less than or equal to 3, the compressor speed is increased by 150rpm on the basis of the current speed; if the second difference is greater than or equal to 0 and less than or equal to 1, the compressor speed remains unchanged; if the second difference is greater than or equal to -3 and less than 0, the compressor speed is decreased by 250rpm on the basis of the current speed; if the second difference is less than -3, the compressor speed is decreased by 300rpm on the basis of the current speed.

[0074] Every third preset time period, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain the first superheat degree, determine the adjustment strategy for the opening of the electronic expansion valve corresponding to the second difference, and adjust the opening of the electronic expansion valve according to the adjustment strategy for the opening of the electronic expansion valve. Specifically, taking the third preset time period as 8 s, the first preset temperature as 15 °C, the second preset temperature as 7 °C, and the first preset degree as 10 ° as an example, every 8 s, calculate the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure once, and when there is a single battery cooling request, record the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure every 8 s as the first superheat degree. If the first superheat degree is greater than or equal to 15 °C, then determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by 10 °, that is, increase by 10 ° on the basis of the current opening of the electronic expansion valve. If the first superheat degree is less than or equal to 7 °C, then determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by 10 °, that is, decrease by 10 ° on the basis of the current opening of the electronic expansion valve. The power distribution is achieved by adjusting the compressor speed and the opening of the electronic expansion valve, thereby achieving the temperature adjustment, and further ensuring that the battery works within a reasonable temperature range. It is easy to think that the parameters in this embodiment are for reference only and are not limited here.

[0075] Further, in one embodiment, referring to Figure 4a , Figure 4a is a schematic flowchart of the adjustment strategy for the compressor speed corresponding to the dual cooling requests of the cab and the battery in the battery temperature management method of the present invention. Referring to Figure 4b , Figure 4b is a schematic flowchart of the adjustment strategy for the opening of the electronic expansion valve corresponding to the dual cooling requests of the cab and the battery in the battery temperature management method of the present invention. As shown in Figure 4a and Figure 4b , when the cooling request is a dual cooling request for the cab and the battery, the steps of adopting the corresponding adjustment strategy for the compressor speed and the adjustment strategy for the opening of the electronic expansion valve according to the cooling request include:

[0076] Step S110, detect the working state of the battery, and determine the target evaporation temperature value according to the detection result;

[0077] Step S111, after increasing the preset speed based on the current speed of the compressor, every first preset time period, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a third difference;

[0078] Step S112, determine the adjustment strategy for the compressor corresponding to the third difference, and adjust the compressor speed according to the adjustment strategy for the compressor;

[0079] Step S113, every third preset time period, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain the second superheat degree;

[0080] Step S114: Determine the corresponding adjustment strategy for the opening of the electronic expansion valve according to the second superheat degree, and adjust the opening of the electronic expansion valve according to the adjustment strategy of the opening of the electronic expansion valve.

[0081] In this embodiment, first, the battery working state is detected, and the target evaporation temperature value is determined according to the detection result. Specifically, if the battery is in the charging state, the target evaporation temperature is determined to be 15°C; if the battery is not in the charging state, the highest temperature of the battery cell is detected. If the highest temperature of the battery cell is greater than 38°C, the target evaporation temperature is determined to be 12°C. If the highest temperature of the battery cell is less than or equal to 38°C, the target evaporation temperature is determined to be 10°C.

[0082] Increase the compressor speed by 2000 rpm based on the current speed, and then calculate the difference between the actual evaporation temperature value and the set target evaporation temperature value every 10 seconds. When there are double refrigeration requests for the cab and the battery, the difference between the actual evaporation temperature value and the set target evaporation temperature value every 10 seconds is recorded as the third difference.

[0083] Determine the compressor adjustment strategy corresponding to the third difference, and adjust the compressor speed according to the compressor adjustment strategy. Specifically, if the third difference is greater than or equal to 5, the compressor speed is increased by 300 rpm based on the current speed; if the third difference is greater than or equal to 2 and less than 5, the compressor speed is increased by 150 rpm based on the current speed; if the third difference is greater than or equal to -1 and less than 2, the compressor speed remains unchanged; if the third difference is greater than or equal to -3 and less than -1, the compressor speed is decreased by 200 rpm based on the current speed; if the third difference is less than -3, the compressor speed is decreased by 300 rpm based on the current speed.

[0084] Furthermore, when the actual evaporation temperature value is less than 2°C, the air-conditioning electromagnetic refrigerant valve is closed. After a delay of 20 s, if it is detected that the actual evaporation temperature is greater than or equal to the target evaporation temperature, the air-conditioning electromagnetic refrigerant valve is opened. Here, the actual evaporation temperature is the temperature collected by the temperature sensor on the evaporator.

[0085] Calculate the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure every third preset time interval. When there are double refrigeration requests for the cab and the battery, the difference between the refrigerant temperature and the saturation temperature corresponding to the refrigerant pressure every third preset time interval is recorded as the second superheat degree.

[0086] Determine the corresponding adjustment strategy for the opening of the electronic expansion valve according to the second superheat degree, and adjust the opening of the electronic expansion valve according to the adjustment strategy of the opening of the electronic expansion valve. It should be noted that in this embodiment, steps S113 and S114 can be executed before step S110 or after step S110.

[0087] Further, in one embodiment, referring to Figure 4c , Figure 4c is Figure 4b a detailed flowchart of step S114 in Figure 4c . As shown in

[0088] Step S121: If the second superheat degree is greater than the third preset temperature, detect whether the compressor speed is the maximum speed;

[0089] Step S122: If the compressor speed is the maximum speed, compare the actual evaporation temperature value with the target evaporation temperature value;

[0090] Step S123: If the actual evaporation temperature value is less than the target evaporation temperature value, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve increased by a first preset degree;

[0091] Step S124: If the actual evaporation temperature value is greater than the sum of the target evaporation temperature value and the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree;

[0092] Step S125: If the compressor speed is not the maximum speed, compare the battery inlet water temperature with the battery required water temperature;

[0093] Step S126: If the battery inlet water temperature is greater than the sum of the battery required water temperature and the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve increased by a first preset degree;

[0094] Step S127: If the battery inlet water temperature is less than the sum of the battery required water temperature minus the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree;

[0095] Step S128: If the second superheat degree is less than or equal to the third preset temperature, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree.

[0096] In this embodiment, first, control the electronic expansion valve to run to the initial opening of 160°, and then adjust it with 160° as the reference point. Taking the third preset temperature as 5°C as an example, when the second superheat degree is greater than 5°C, detect whether the current compressor speed is the maximum speed.

[0097] If the current compressor speed is the maximum speed, compare the actual evaporation temperature with the target evaporation temperature.

[0098] If the actual evaporation temperature is less than the target evaporation temperature, it is determined that the adjusted opening of the electronic expansion valve is an increase of 10° in the opening of the electronic expansion valve, that is, an increase of 10° based on the current opening of the electronic expansion valve; if the actual evaporation temperature is greater than or equal to the target evaporation temperature and less than or equal to the sum of the target evaporation temperature plus 1°C, it is determined that the adjusted opening of the electronic expansion valve is 0°, that is, the opening of the electronic expansion valve remains unchanged.

[0099] If the actual evaporation temperature is greater than the sum of the target evaporation temperature plus 1°C, it is determined that the adjusted opening of the electronic expansion valve is a decrease of 10° in the opening of the electronic expansion valve, that is, a decrease of 10° based on the current opening of the electronic expansion valve. Further, when the battery inlet water temperature is less than the battery required water temperature, it is also determined that the adjusted opening of the electronic expansion valve is a decrease of 10° in the opening of the electronic expansion valve, and also a decrease of 10° based on the current opening of the electronic expansion valve.

[0100] If the current compressor speed is not the maximum speed, that is, the current compressor speed is less than the maximum speed, then when the battery inlet water temperature is greater than the sum of the battery required warm water plus 1°C, it is determined that the adjusted opening of the electronic expansion valve is an increase of 10° in the opening of the electronic expansion valve, that is, an increase of 10° based on the current opening of the electronic expansion valve. When the battery inlet water temperature is less than the difference between the battery required warm water minus 1°C, it is determined that the adjusted opening of the electronic expansion valve is a decrease of 10° in the opening of the electronic expansion valve, and a decrease of 10° based on the current opening of the electronic expansion valve. When the battery inlet water temperature is greater than or equal to the difference between the battery required warm water minus 1°C and less than or equal to the sum of the battery required warm water plus 1°C, the opening of the electronic expansion valve remains unchanged.

[0101] When the second superheat degree is less than or equal to 5°C, it is determined that the adjusted opening of the electronic expansion valve is a decrease of 10° in the opening of the electronic expansion valve, and a decrease of 10° based on the current opening of the electronic expansion valve. Among them, in this embodiment, the maximum opening of the electronic expansion valve is 400°, and the minimum opening is 160°. It is easy to think that the parameters in this embodiment are only for reference here and are not limited. It should be noted that step S128 is the adjustment strategy of the electronic expansion valve opening corresponding to the double refrigeration requests of the cab and the battery when the second superheat degree is less than or equal to 5°C.

[0102] Further, in one embodiment, the battery thermal management method further includes:

[0103] When the battery thermal management controller receives a single refrigeration request from the cab, every first preset time interval, the actual evaporation temperature value is subtracted from the set target evaporation temperature value to obtain a first difference;

[0104] Determine the compressor speed adjustment strategy corresponding to the first difference.

[0105] In this embodiment, when the battery thermal management controller receives a single refrigeration request from the cab, that is, when there is no refrigeration request for the battery, the difference between the actual evaporation temperature value and the set target evaporation temperature value is calculated every 10 s, and the difference between the actual evaporation temperature value and the set target evaporation temperature value calculated every 10 s when the single refrigeration request from the cab is received is recorded as the first difference.

[0106] Determine the compressor speed adjustment strategy corresponding to the first difference. Specifically, after the compressor starts from the starting speed of 3000 rpm, if the first difference is greater than 4, the compressor speed adjustment strategy is to increase the compressor speed by 300 rpm; if the first difference is greater than 1 and less than or equal to 4, the compressor speed adjustment strategy is to increase the compressor speed by 150 rpm; if the first difference is greater than or equal to -1 and less than or equal to 1, the compressor speed adjustment strategy is to keep the compressor speed unchanged; if the first difference is greater than or equal to -3 and less than -1, the compressor speed adjustment strategy is to decrease the compressor speed by 200 rpm; if the first difference is less than -3, the compressor speed adjustment strategy is to decrease the compressor speed by 300 rpm.

[0107] Further, when the actual evaporation temperature is less than 2 °C, the compressor stops running. After a delay of 20 s, if the actual evaporation temperature is greater than or equal to the target evaporation temperature, control the compressor to run at the lowest speed. It is easy to think that the parameters in this embodiment are for reference only and are not limited.

[0108] Further, in one embodiment, the battery temperature management method further includes:

[0109] If the battery thermal management controller has a fault, activate the fault protection measure corresponding to the fault.

[0110] In this embodiment, if the self-check result after the battery thermal management self-check is that the electric thermal management controller has a fault, activate the fault protection measure corresponding to the fault. Specifically, if the electronic expansion valve of the electric thermal management controller has a fault, when entering the battery cooling mode, the compressor stops running and the air-conditioning refrigeration mode operates normally; if the compressor of the electric thermal management controller has a fault, both the battery cooling system and the air-conditioning cooling system stop running. It is easy to think that there may be other faults in the battery thermal management controller, and then activate the fault protection measures corresponding to other faults.

[0111] In a third aspect, an embodiment of the present invention further provides a battery temperature management device.

[0112] In one embodiment, refer to Figure 5 , Figure 5 is a schematic diagram of the functional modules of an embodiment of the battery temperature management device of the present invention. As Figure 5 shown, the battery temperature management device includes:

[0113] A refrigeration request management module, which is used to, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, adopt corresponding compressor speed adjustment strategies and electronic expansion valve opening adjustment strategies according to the refrigeration request;

[0114] A heating request management module, which is used to, if the battery thermal management controller receives a heating request, determine the heater adjustment power based on the battery required water temperature and the battery inlet water temperature, and adjust the heater power according to the heater adjustment power.

[0115] Further, in an embodiment, the refrigeration request management module is specifically used for:

[0116] When the refrigeration request is a single battery refrigeration request, every second preset time interval, subtract the target evaporation temperature value from the actual evaporation temperature value to obtain a second difference;

[0117] Determine the compressor adjustment strategy corresponding to the second difference, and adjust the compressor speed according to the compressor adjustment strategy;

[0118] Every third preset time interval, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain a first superheat degree;

[0119] If the first superheat degree is greater than or equal to a first preset temperature, determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by a first preset degree, and increase by a first preset degree on the basis of the current opening of the electronic expansion valve;

[0120] If the first superheat degree is less than or equal to a second preset temperature, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by a first preset degree, and decrease by a first preset degree on the basis of the current opening of the electronic expansion valve, where the first preset temperature is greater than the second preset temperature.

[0121] Further, in an embodiment, the refrigeration request management module is specifically used for:

[0122] When the refrigeration request is a dual refrigeration request for the cab and the battery, detect the battery working state and determine the target evaporation temperature value according to the detection result;

[0123] After increasing the preset speed based on the current speed of the compressor, every first preset time interval, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a third difference;

[0124] Determine the compressor adjustment strategy corresponding to the third difference, and adjust the compressor speed according to the compressor adjustment strategy;

[0125] Every third preset time interval, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain a second superheat degree;

[0126] Determine the corresponding adjustment strategy for the opening of the electronic expansion valve according to the second superheat degree, and adjust the opening of the electronic expansion valve according to the adjustment strategy of the opening of the electronic expansion valve.

[0127] Further, in one embodiment, the refrigeration request management module is further configured to:

[0128] If the second superheat degree is greater than the third preset temperature, detect whether the compressor speed is the maximum speed;

[0129] If the compressor speed is the maximum speed, compare the actual evaporation temperature value with the target evaporation temperature value;

[0130] If the actual evaporation temperature value is less than the target evaporation temperature value, determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by a first preset degree;

[0131] If the actual evaporation temperature value is greater than the sum of the target evaporation temperature value and the second preset degree, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by a first preset degree;

[0132] If the compressor speed is not the maximum speed, compare the battery inlet water temperature with the battery required water temperature;

[0133] If the battery inlet water temperature is greater than the sum of the battery required water temperature and the second preset degree, determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by a first preset degree;

[0134] If the battery inlet water temperature is less than the sum of the battery required water temperature minus the second preset degree, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by a first preset degree;

[0135] If the second superheat degree is less than or equal to the third preset temperature, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by a first preset degree.

[0136] Further, in one embodiment, the heating request management module is further configured to:

[0137] Every fourth preset time interval, subtract the battery inlet water temperature from the battery required water temperature to obtain a fourth difference;

[0138] Determine the heater adjustment power corresponding to the fourth difference according to the corresponding relationship between the temperature difference and the calibrated heater adjustment power.

[0139] Further, in one embodiment, the refrigeration request management module is further configured to:

[0140] When the battery thermal management controller receives a single refrigeration request from the cab, every first preset time interval, the actual evaporation temperature value is subtracted from the set target evaporation temperature value to obtain a first difference value;

[0141] Determine the compressor speed adjustment strategy corresponding to the first difference value.

[0142] Further, in an embodiment, the battery temperature management device further includes a fault management module for:

[0143] If a fault occurs in the battery thermal management controller, activate the fault protection measure corresponding to the fault.

[0144] Among them, the function implementation of each module in the above battery temperature management device corresponds to each step in the above battery temperature management method embodiment, and its function and implementation process will not be elaborated here one by one.

[0145] Fourthly, an embodiment of the present invention further provides a readable storage medium.

[0146] The readable storage medium of the present invention stores a battery temperature management program, where when the battery temperature management program is executed by a processor, the steps of the battery temperature management method as described above are implemented.

[0147] Among them, the method implemented when the battery temperature management program is executed can refer to each embodiment of the battery temperature management method of the present invention, and will not be elaborated here.

[0148] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system 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 system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or system including the element.

[0149] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0150] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions for causing a terminal device to execute the methods described in various embodiments of the present invention.

[0151] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A battery temperature management method, characterized in that, the battery temperature management method includes: When the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy are adopted according to the refrigeration request; If the battery thermal management controller receives a heating request, the heater adjustment power is determined based on the battery required water temperature and the battery inlet water temperature, and the heater power is adjusted according to the heater adjustment power; When the refrigeration request is a double refrigeration request for the cab and the battery, the step of adopting corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the refrigeration request includes: Detect the battery working state, and determine the target evaporation temperature value according to the detection result; After increasing the preset speed based on the current speed of the compressor, every first preset time interval, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a third difference; Determine the compressor adjustment strategy corresponding to the third difference, and adjust the compressor speed according to the compressor adjustment strategy; Every third preset time interval, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain a second superheat degree; Determine the corresponding electronic expansion valve opening adjustment strategy according to the second superheat degree, and adjust the opening of the electronic expansion valve according to the electronic expansion valve opening adjustment strategy; The step of determining the corresponding electronic expansion valve opening adjustment strategy according to the second superheat degree includes: If the second superheat degree is greater than the third preset temperature, detect whether the compressor speed is the maximum speed; If the compressor speed is the maximum speed, compare the actual evaporation temperature value with the target evaporation temperature value; If the actual evaporation temperature value is less than the target evaporation temperature value, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve increased by a first preset degree; If the actual evaporation temperature value is greater than the sum of the target evaporation temperature value and the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree; If the compressor speed is not the maximum speed, compare the battery inlet water temperature with the battery required water temperature; If the battery inlet water temperature is greater than the sum of the battery required water temperature and the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve increased by a first preset degree; If the battery inlet water temperature is less than the sum of the battery required water temperature minus the second preset degree, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree; If the second superheat degree is less than or equal to the third preset temperature, determine that the adjusted opening of the electronic expansion valve is the opening of the electronic expansion valve decreased by a first preset degree.

2. The battery temperature management method according to claim 1, characterized in that, When the refrigeration request is a single refrigeration request for the battery, the step of adopting corresponding compressor speed adjustment strategy and electronic expansion valve opening adjustment strategy according to the refrigeration request includes: Every second preset time interval, subtract the target evaporation temperature value from the actual evaporation temperature value to obtain a second difference; Determine the compressor adjustment strategy corresponding to the second difference, and adjust the compressor speed according to the compressor adjustment strategy; Every third preset time period, subtract the saturation temperature corresponding to the refrigerant pressure from the refrigerant temperature to obtain the first superheat degree. If the first superheat degree is greater than or equal to the first preset temperature, determine that the adjusted opening of the electronic expansion valve is to increase the opening of the electronic expansion valve by the first preset number of degrees, and increase by the first preset number of degrees based on the current opening of the electronic expansion valve. If the first superheat degree is less than or equal to the second preset temperature, determine that the adjusted opening of the electronic expansion valve is to decrease the opening of the electronic expansion valve by the first preset number of degrees, and decrease by the first preset number of degrees based on the current opening of the electronic expansion valve, where the first preset temperature is greater than the second preset temperature.

3. The battery temperature management method according to claim 1, characterized in that the step of determining the adjusted power of the heater based on the battery required water temperature and the battery inlet water temperature includes: Every fourth preset time period, subtract the battery inlet water temperature from the battery required water temperature to obtain a fourth difference; Determine the adjusted power of the heater corresponding to the fourth difference according to the corresponding relationship between the temperature difference and the calibrated adjusted power of the heater.

4. The battery temperature management method according to claim 1, characterized in that the battery thermal management method further includes: When the battery thermal management controller receives a single refrigeration request from the cab, every first preset time period, subtract the set target evaporation temperature value from the actual evaporation temperature value to obtain a first difference; Determine the compressor speed adjustment strategy corresponding to the first difference.

5. The battery temperature management method according to any one of claims 1 to 4, characterized in that the battery temperature management method further includes: If a fault exists in the battery thermal management controller, activate the fault protection measure corresponding to the fault.

6. A battery temperature management device, characterized in that the battery temperature management device includes: A refrigeration request management module, configured to, when the battery thermal management controller has no fault, if the battery thermal management controller receives a refrigeration request, adopt a corresponding compressor speed adjustment strategy and an electronic expansion valve opening adjustment strategy according to the refrigeration request; A heating request management module, configured to, if the battery thermal management controller receives a heating request, determine the adjusted power of the heater based on the battery required water temperature and the battery inlet water temperature, and adjust the heater power according to the adjusted power of the heater.

7. A battery temperature management device, characterized in that the battery temperature management device includes a processor, a memory, and a battery temperature management program stored on the memory and executable by the processor, where when the battery temperature management program is executed by the processor, the steps of the battery temperature management method according to any one of claims 1 to 5 are implemented.

8. A readable storage medium, characterized in that a battery temperature management program is stored on the readable storage medium, where when the battery temperature management program is executed by a processor, the steps of the battery temperature management method according to any one of claims 1 to 5 are implemented.

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