Battery cooling methods, devices, electronic equipment and storage media for new energy vehicles

Abstract

This invention relates to a battery cooling method, apparatus, electronic device, and storage medium for new energy vehicles. The method includes: when it is determined that the battery requires cooling, acquiring the outdoor ambient temperature and the battery cooling temperature when the battery is immersed in coolant; looking up the initial coolant temperature in a preset data table based on the battery cooling temperature and the outdoor ambient temperature, wherein the preset data table contains a correspondence between the battery cooling temperature, the outdoor ambient temperature, and the initial coolant temperature; if, after cooling the battery according to the initial coolant temperature, the current battery temperature cannot reach the battery cooling temperature, then determining a target coolant temperature based on the current battery temperature, the battery cooling temperature, and the initial coolant temperature; and adjusting the coolant temperature according to the target coolant temperature to bring the current battery temperature up to the battery cooling temperature. This application can reduce battery cooling energy consumption.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to battery cooling methods, devices, electronic equipment, and storage media for new energy vehicles. Background Technology

[0002] With societal progress and economic development, the demand for automobiles is increasing. Traditional gasoline-powered vehicles use petroleum as fuel, and petroleum is a non-renewable resource, leading to a significant increase in petroleum consumption. Consequently, people are seeking renewable energy sources to replace petroleum, with clean energy being a primary focus. With technological breakthroughs, new energy vehicles have become a trend, and the battery, as its power source, is one of the most crucial components. Because batteries generate a large amount of heat during charging and discharging, directly affecting battery performance and safety, battery cooling technology, especially battery cooling control, has gradually become an important direction in the development of new energy vehicles. Battery cooling technology includes two types: refrigerant cooling and water cooling. This invention primarily focuses on water-cooled battery cooling strategies.

[0003] In existing cooling systems, the battery cell temperature needs to be reduced to a set exit cooling threshold before the battery can exit the cooling state, thus stopping the battery cooling system from operating. This requires the battery cell temperature to drop sufficiently before exiting the cooling system, which is a rather crude control method and results in high energy consumption for battery cooling. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cooling method, apparatus, electronic device, and storage medium for new energy vehicles, so as to solve the battery cooling problem of new energy vehicles in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for cooling a battery in a new energy vehicle, the method comprising:

[0007] When it is determined that the battery has a cooling requirement, the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant are obtained.

[0008] The initial temperature of the coolant is found in a preset data table based on the battery cooling temperature and the outdoor ambient temperature. The preset data table contains the correspondence between the battery cooling temperature, the outdoor ambient temperature and the initial temperature of the coolant.

[0009] If the current battery temperature cannot reach the battery cooling temperature after cooling the battery according to the initial temperature of the coolant, then the target temperature of the coolant is determined according to the current battery temperature, the battery cooling temperature and the initial temperature of the coolant.

[0010] The coolant temperature is adjusted according to the target coolant temperature so that the current battery temperature reaches the battery cooling temperature.

[0011] Furthermore, if the battery temperature cannot reach the battery cooling temperature after cooling the battery based on the initial temperature of the coolant, the following applies:

[0012] Get the current coolant temperature;

[0013] If the current coolant temperature is greater than the initial coolant temperature, then the compressor is activated to cool the coolant, wherein the coolant is used to cool the battery.

[0014] Get the current battery temperature after cooling;

[0015] It is determined that the current battery temperature after cooling is different from the battery cooling temperature.

[0016] Furthermore, determining the target coolant temperature based on the current battery temperature, the battery cooling temperature, and the initial coolant temperature includes:

[0017] Obtain the set coefficient and determine the temperature difference between the current battery temperature and the battery cooling temperature;

[0018] Determine the product value between the set coefficient and the temperature difference;

[0019] The target temperature of the coolant is determined based on the difference between the initial temperature of the coolant and the product value.

[0020] Furthermore, adjusting the coolant temperature according to the target coolant temperature includes:

[0021] If the temperature of the cooled liquid after cooling is higher than the target temperature of the cooled liquid, the battery cooler is turned on, and the temperature of the cooled liquid is reduced to the target temperature of the cooled liquid through the battery cooler and the compressor.

[0022] If the temperature of the cooled liquid after cooling is lower than the target temperature of the cooled liquid, the battery cooler is kept in the off state, and the temperature of the cooled liquid is controlled to rise to the target temperature of the cooled liquid.

[0023] Furthermore, reducing the temperature of the coolant to the target temperature using a battery cooler and compressor includes:

[0024] The temperature of the coolant is reduced by a battery cooler and a compressor;

[0025] If the temperature of the coolant is lower than the target temperature of the coolant and the speed of the compressor is greater than the minimum speed, then the speed of the compressor is controlled to be reduced.

[0026] If the compressor speed is reduced to the minimum speed and the coolant temperature is still lower than the target coolant temperature, then the compressor is turned off until the coolant temperature reaches the target coolant temperature.

[0027] Furthermore, it was determined that the battery has cooling requirements, including:

[0028] Get the current vehicle speed;

[0029] Based on a preset correspondence, determine the cooling threshold corresponding to the current vehicle speed and the outdoor ambient temperature;

[0030] If the current battery temperature is greater than the cooling threshold, then it is determined that the battery has a cooling requirement.

[0031] Furthermore, before determining the target temperature of the coolant, the method further includes:

[0032] Set the upper and lower limits of the target temperature for the coolant.

[0033] A battery cooling device for a new energy vehicle, the device comprising:

[0034] The acquisition module is used to acquire the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant, when it is determined that the battery has a cooling requirement.

[0035] The lookup module is used to look up the initial temperature of the coolant in a preset data table based on the battery cooling temperature and the outdoor ambient temperature. The preset data table contains the correspondence between the battery cooling temperature, the outdoor ambient temperature and the initial temperature of the coolant.

[0036] The determination module is used to determine the target temperature of the coolant based on the current battery temperature, the battery cooling temperature, and the initial temperature of the coolant if the current battery temperature cannot reach the battery cooling temperature after cooling the battery according to the initial temperature of the coolant.

[0037] The adjustment module is used to adjust the temperature of the coolant according to the target temperature of the coolant so that the current battery temperature reaches the battery cooling temperature.

[0038] An electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0039] Memory, used to store computer programs;

[0040] A processor, when executing a program stored in memory, implements any of the methods described above.

[0041] A computer-readable storage medium storing a computer program that, when executed by a processor, implements any of the methods described above.

[0042] The beneficial effects of this invention are: instead of simply stopping the battery from cooling after the battery cell temperature reaches the cooling threshold, it uses the initial temperature of the coolant to initially cool the battery. If the current battery temperature cannot reach the battery cooling temperature, the target temperature of the coolant is used to adjust the battery temperature, thereby ensuring that the current battery temperature reaches the battery cooling temperature, ensuring that the battery operates in the most energy-efficient mode and reducing the battery's cooling energy consumption. Attached Figure Description

[0043] Figure 1 This is a flowchart of the battery cooling method for new energy vehicles in this invention;

[0044] Figure 2 This is a schematic diagram illustrating the setting of low and high temperatures in this invention;

[0045] Figure 3 This is a schematic diagram illustrating the low-speed, medium-speed, and high-speed settings of the vehicle speed in this invention;

[0046] Figure 4 This is a block diagram of a battery cooling system architecture for a new energy vehicle according to the present invention;

[0047] Figure 5 This is a block diagram of a battery cooling control strategy for a new energy vehicle according to the present invention;

[0048] Figure 6 This is a flowchart of a battery cooling control system for a new energy vehicle according to the present invention.

[0049] Figure 7 This is a schematic diagram of a battery cooling device for a new energy vehicle according to the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of an electronic device according to the present invention. Detailed Implementation

[0051] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0052] A battery cooling method for a new energy vehicle, as described in this application embodiment, can be executed by a thermal management domain controller (hereinafter referred to as the controller). The following will describe in detail the battery cooling method for a new energy vehicle provided by this invention, in conjunction with specific embodiments. Figure 1 As shown, the specific steps are as follows:

[0053] Step 101: When it is determined that the battery has a cooling requirement, obtain the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant.

[0054] When the vehicle is in operation, i.e., the high voltage is on, the battery thermal management system is activated. If the current battery temperature of the new energy vehicle exceeds a set threshold, it is determined that the battery requires cooling. At this time, the controller acquires the outdoor ambient temperature and the battery cooling temperature when it enters the coolant. Multiple temperature sensors are installed at different locations on the battery; each sensor detects a temperature when the battery enters the coolant, and the controller selects the highest temperature as the battery cooling temperature.

[0055] Step 102: Find the initial coolant temperature in the preset data table based on the battery cooling temperature and the outdoor ambient temperature.

[0056] The preset data table contains the correspondence between battery cooling temperature, outdoor ambient temperature, and coolant initial temperature.

[0057] The battery cooling temperature, outdoor ambient temperature, and coolant initial temperature constitute a preset data table (two-dimensional table), as shown in Table 1. The initial coolant temperature can be obtained by querying this table.

[0058]

[0059] Table 1

[0060] The initial coolant temperature corresponding to the battery cooling temperature data between 35℃ and 40℃ can be determined using a linear relationship. Similarly, the initial coolant temperature corresponding to the unmarked outdoor ambient temperature data between 20℃ and 40℃ can also be determined using a linear relationship.

[0061] Step 103: If the current battery temperature cannot reach the battery cooling temperature after cooling the battery based on the initial coolant temperature, then determine the target coolant temperature based on the current battery temperature, the battery cooling temperature, and the initial coolant temperature.

[0062] The controller calculates the initial coolant temperature based on the battery cooling temperature and the outdoor ambient temperature. It then controls the coolant temperature according to this initial temperature to cool the battery. Once the battery is in cooling mode, the battery water pump's operating speed needs to be maintained above 80%. After the battery cools, the controller uses sensors on the battery to detect its current temperature. If the current battery temperature cannot reach the cooling temperature, it indicates that the current battery temperature is too high or too low. In this case, the initial coolant temperature needs to be adjusted to the target coolant temperature to regulate the battery temperature. Specifically, the target coolant temperature is determined based on the current battery temperature, the battery cooling temperature, and the initial coolant temperature. The detailed determination method is described below and will not be repeated here.

[0063] Step 104: Adjust the coolant temperature according to the target coolant temperature to bring the current battery temperature up to the battery cooling temperature.

[0064] The controller adjusts the coolant temperature according to the target coolant temperature to bring the current battery temperature up to the battery cooling temperature.

[0065] In this application, the battery does not simply exit the cooling state after the battery cell temperature reaches the exit cooling threshold. Instead, the battery is initially cooled using the initial temperature of the coolant. If the current battery temperature cannot reach the battery cooling temperature, the target temperature of the coolant is used to regulate the battery temperature, thereby ensuring that the current battery temperature reaches the battery cooling temperature. This ensures that the battery operates in the most energy-efficient mode and reduces the battery's cooling energy consumption.

[0066] As an optional implementation, if the battery temperature cannot reach the battery cooling temperature after cooling the battery based on the initial temperature of the coolant, the following steps are taken: obtaining the current coolant temperature; if the current coolant temperature is higher than the initial coolant temperature, determining to start the compressor to cool the coolant, wherein the coolant is used to cool the battery; obtaining the current battery temperature after cooling; and determining that the current battery temperature after cooling is different from the battery cooling temperature.

[0067] After the controller finds the initial coolant temperature from the preset data table, it obtains the current coolant temperature through the coolant temperature sensor and compares the current coolant temperature with the initial coolant temperature. If the current coolant temperature is lower than the initial coolant temperature, the compressor does not start, and the expansion valve shut-off valve is closed. If the current coolant temperature is higher than the initial coolant temperature, the expansion valve shut-off valve opens, and the compressor starts to cool the system. The compressor speed is related to the temperature difference (temperature difference = current coolant temperature - initial coolant temperature); the larger the temperature difference, the higher the compressor speed.

[0068] After the compressor cools down, the coolant temperature decreases, and the battery temperature also decreases accordingly. The controller obtains the current battery temperature after cooling in real time and compares the current battery temperature with the battery cooling temperature. If the current battery temperature after cooling is always different from the battery cooling temperature, it is considered that the current battery temperature cannot reach the battery cooling temperature.

[0069] As an optional implementation, determining the target temperature of the coolant based on the current battery temperature, the battery cooling temperature, and the initial temperature of the coolant includes: obtaining a set coefficient and determining the temperature difference between the current battery temperature and the battery cooling temperature; determining the product between the set coefficient and the temperature difference; and determining the target temperature of the coolant based on the difference between the initial temperature of the coolant and the product.

[0070] The controller obtains the set coefficient K and determines the temperature difference ΔT between the current battery temperature and the battery cooling temperature, i.e., ΔT = current battery temperature - battery cooling temperature.

[0071] Target coolant temperature = initial coolant temperature - (K*ΔT).

[0072] If the temperature of the coolant after cooling is greater than the target temperature of the coolant, i.e. ΔT is a positive number, the battery temperature will rise after entering the battery cooling system. In order to maintain the cell temperature, it is necessary to lower the target temperature of the coolant and increase the battery cooling capacity. Therefore, the controller controls the battery cooler to be turned on, and lowers the temperature of the coolant to the target temperature of the coolant through the battery cooler and the compressor.

[0073] If the temperature of the coolant after cooling is lower than the target temperature of the coolant, i.e., ΔT is negative, the battery temperature will drop after entering the battery cooling system. In order to maintain the cell temperature, the target temperature of the coolant needs to be raised. Therefore, the controller controls the battery cooler to remain in the off state and controls the temperature of the coolant to be raised to the target temperature of the coolant.

[0074] If ΔT > 0, the battery temperature rises during battery cooling, requiring further reduction of the coolant temperature to ensure more heat is dissipated. For example, assuming the battery requires cooling, the ambient outdoor temperature is 25°C, and the battery cooling temperature is 43°C, the initial coolant temperature, calculated from the table above, is 25°C. During cooling, the battery temperature rises to 44°C. Therefore, ΔT = current battery temperature - battery cooling temperature = 44°C - 43°C = 1°C > 0, indicating the coolant temperature needs adjustment. Since k = 2, the adjustment is: target coolant temperature = initial coolant temperature - (K * ΔT) = 25 - (2 * 1) = 23°C. That is, the coolant temperature should be controlled to 23°C.

[0075] If ΔT < 0, the battery temperature drops during battery cooling, requiring a further increase in the coolant temperature to maintain the battery temperature. For example, assuming the battery requires cooling, the ambient outdoor temperature is 25°C, and the battery cooling temperature is 43°C, the initial coolant temperature, calculated from the table above, is 25°C. During cooling, the battery temperature rises to 42°C. Therefore, ΔT = current battery temperature - battery cooling temperature = 42°C - 43°C = -1°C < 0, meaning the coolant temperature needs adjustment. With k = 2, the adjustment is: target coolant temperature = initial coolant temperature - (K * ΔT) = 25 - (2 * (-1)) = 27°C. That is, the coolant temperature is controlled to 27°C.

[0076] As an optional implementation, before determining the target coolant temperature, the method further includes setting an upper limit temperature and a lower limit temperature for the target coolant temperature. To ensure effective heat exchange between the battery and the coolant, the maximum value of the target coolant temperature needs to be limited to avoid the coolant temperature being too high, resulting in a small temperature difference between the coolant and the battery, hindering effective heat exchange and failing to achieve the purpose of battery cooling. Simultaneously, the thermal management system has a maximum cooling capacity limitation, so the minimum value of the target coolant temperature needs to be limited to prevent the coolant temperature from being too low, causing the actual battery temperature to consistently fail to reach the coolant temperature, resulting in the compressor running at continuously high speeds. For example, the target coolant temperature range is [18, 30].

[0077] As an optional implementation, reducing the coolant temperature to the target coolant temperature via the battery cooler and compressor includes: reducing the coolant temperature via the battery cooler and compressor; if the coolant temperature is lower than the target coolant temperature and the compressor speed is higher than the minimum speed, then controlling the compressor speed to decrease; if the coolant temperature is still lower than the target coolant temperature when the compressor speed is reduced to the minimum speed, then turning off the compressor until the coolant temperature reaches the target coolant temperature.

[0078] Based on the calculated target coolant temperature, the controller further activates the battery refrigerant circuit. The activation strategy for the battery refrigerant circuit is as follows: when the coolant temperature is lower than the target coolant temperature, the battery cooler remains off; when the coolant temperature is higher than the target coolant temperature, the battery cooler is activated.

[0079] When the coolant temperature is lower than the target coolant temperature, for example, less than 1°C, and the compressor speed is higher than the minimum speed, the compressor speed will be slowly reduced until the coolant temperature equals the target coolant temperature. If, after the compressor speed drops to the minimum, the coolant temperature is still lower than the target coolant temperature, for example, less than 1°C or more, the controller will shut down the compressor.

[0080] Furthermore, after the compressor is turned off, the temperature of the coolant rises, and the compressor is restarted when the temperature is 2°C higher than the target temperature of the coolant.

[0081] As an optional implementation method, determining that the battery has a cooling requirement includes: obtaining the current vehicle speed; determining the cooling threshold corresponding to the current vehicle speed and the outdoor ambient temperature according to a preset correspondence; if the current battery temperature is greater than the cooling threshold, then determining that the battery has a cooling requirement.

[0082] As an optional implementation, the battery exiting the cooling system includes: acquiring the current vehicle speed; determining a cooling exit threshold corresponding to the current vehicle speed and the outdoor ambient temperature according to a set correspondence; and determining that the battery exits the cooling system if the current battery temperature is less than the cooling exit threshold.

[0083] Table 2 shows the conditions for determining when the battery enters and exits the cooling system.

[0084]

[0085] Table 2

[0086] When the outdoor ambient temperature is less than or equal to Tamb, the battery cooling condition is activated.

[0087] 1) When the vehicle speed is low and the maximum cell temperature is greater than or equal to A2, the battery enters the cooling system.

[0088] 2) When the vehicle speed is in medium speed range and the maximum cell temperature is greater than or equal to B2, the battery enters the cooling system.

[0089] 3) When the vehicle speed is at high speed and the maximum cell temperature is greater than or equal to C2, the battery enters the cooling system.

[0090] Exit cooling conditions:

[0091] When the vehicle speed is low and the maximum cell temperature is below or equal to A1, the battery is removed from the cooling system.

[0092] When the vehicle speed is at medium speed and the maximum cell temperature is below or equal to B1, the battery is out of the cooling system.

[0093] When the vehicle speed is at high speed and the maximum cell temperature is below or equal to C1, the battery is out of the cooling system.

[0094] When the outdoor ambient temperature exceeds Tamb, the battery cooling condition is activated.

[0095] 1) When the vehicle speed is low and the maximum cell temperature is greater than or equal to A4, the battery enters the cooling system.

[0096] 2) When the vehicle speed is in medium speed range and the maximum cell temperature is greater than or equal to B4, the battery enters the cooling system.

[0097] 3) When the vehicle speed is at high speed and the maximum cell temperature is greater than or equal to C4, the battery enters the cooling system.

[0098] Exit cooling conditions:

[0099] When the vehicle speed is low and the maximum cell temperature is below or equal to A3, the battery is removed from the cooling system.

[0100] When the vehicle speed is at medium speed and the maximum cell temperature is below or equal to B3, the battery is out of the cooling system.

[0101] When the vehicle speed is at high speed and the maximum cell temperature is below or equal to C3, the battery is out of the cooling system.

[0102] The system needs to determine the battery cooling requirements in non-charging mode. Non-charging mode is categorized into low-speed battery cooling requirements in low-temperature environments, medium-speed battery cooling requirements in low-temperature environments, high-speed battery cooling requirements in low-temperature environments, low-speed battery cooling requirements in high-temperature environments, medium-speed battery cooling requirements in high-temperature environments, and high-speed battery cooling requirements in high-temperature environments.

[0103] Specifically, the battery cooling threshold setting is divided into 6 operating conditions, each with a different threshold setting:

[0104] Operating condition 1: The ambient temperature is low, the vehicle speed is low, and the battery cooling threshold is 43℃.

[0105] Operating condition 2: The ambient temperature is low, the vehicle speed is medium, and the battery cooling threshold is 42℃.

[0106] Operating condition 3: The ambient temperature is low, the vehicle speed is high, and the battery cooling threshold is 41℃.

[0107] Operating condition 4: The ambient temperature is high, the vehicle speed is low, and the battery cooling threshold is 43℃.

[0108] Operating condition 5: Ambient temperature is high, vehicle speed is medium, and battery cooling threshold is 39℃.

[0109] Operating condition 6: The ambient temperature is high, the vehicle speed is high, and the battery cooling threshold is 39°C.

[0110] To ensure the battery is not continuously cooled in the event of a closed-loop battery cooling logic or abnormal conditions, a battery cooling exit threshold must be set for each operating condition.

[0111] Operating condition 1: The ambient temperature is low, the vehicle speed is low, and the battery cooling exit threshold is 39℃.

[0112] Operating condition 2: The ambient temperature is low, the vehicle speed is medium, and the battery cooling exit threshold is 39℃.

[0113] Operating condition 3: The ambient temperature is low, the vehicle speed is high, and the battery cooling exit threshold is 39℃;

[0114] Operating condition 4: The ambient temperature is high, the vehicle speed is low, and the battery cooling exit threshold is 39℃.

[0115] Operating condition 5: Ambient temperature is high, vehicle speed is medium, and battery cooling exit threshold is 35℃.

[0116] Operating condition 6: The ambient temperature is high, the vehicle speed is high, and the battery cooling exit threshold is 35℃.

[0117] Once the battery enters the cooling state, the battery cell temperature drops to below or equal to the cooling exit threshold during the cooling process. The battery then exits the cooling state.

[0118] For the settings of low temperature and high temperature in the operating conditions, please refer to [link / reference]. Figure 2 That is, when the ambient temperature is ≥28℃, it is considered high temperature; when the ambient temperature is ≤25℃, it is considered low temperature; and when the ambient temperature is between 25℃ and 28℃, the previous state is maintained. For low, medium, and high speed settings, see [link to vehicle speed settings]. Figure 3 Vehicle speeds of ≤25km / h are considered low speeds; speeds of 45km / h ≤ 55km / h are considered medium speeds; and speeds of ≥75km / h are considered high speeds.

[0119] In one embodiment of the present invention, the battery cooling requirement in non-charging mode is determined as follows:

[0120] An ambient temperature of ≤25℃ is considered a low-temperature environment.

[0121] At vehicle speeds ≤25km / h (low speed), the battery cell temperature reaches a maximum of ≥43℃. The battery requires cooling. At battery cell temperatures <43℃, the battery does not require cooling.

[0122] At vehicle speeds between 45 km / h and 55 km / h (medium speed), the battery cell temperature is ≥42℃. The battery requires cooling. At vehicle speeds between 45 km / h and 55 km / h, the battery cell temperature is <42℃. The battery does not require cooling.

[0123] At vehicle speeds ≥75km / h (high speed), the battery cell temperature reaches a maximum of ≥41℃. The battery requires cooling. At battery cell temperatures <41℃, the battery does not require cooling.

[0124] An ambient temperature ≥ 28℃, i.e., a high-temperature environment:

[0125] At vehicle speeds ≤25km / h (low speed), the battery cell temperature reaches a maximum of ≥43℃. The battery requires cooling. At battery cell temperatures <43℃, the battery does not require cooling.

[0126] At vehicle speeds between 45 km / h and 55 km / h (medium speed), the battery cell temperature is ≥39℃. The battery requires cooling. At vehicle speeds between 45 km / h and 55 km / h, the battery cell temperature is <39℃. The battery does not require cooling.

[0127] At vehicle speeds ≥75km / h (medium speed), the battery cell temperature reaches a maximum of ≥39℃. The battery requires cooling. At battery cell temperatures <39℃, the battery does not require cooling.

[0128] When the battery has no cooling requirement, there is no need for the compressor to operate at a certain speed. The battery water pump is turned off, and the expansion valve shut-off valve is closed.

[0129] This application addresses the cooling control of batteries in new energy vehicles. By assessing different vehicle speeds and ambient temperatures, it determines the battery's usage scenarios under various operating conditions, sets different cooling thresholds, and precisely controls the battery temperature to maintain a constant cell temperature after cooling begins.

[0130] Based on the same technical concept, this invention also provides a block diagram of a battery cooling system architecture for new energy vehicles. For example... Figure 4 As shown.

[0131] The automotive battery cooling system includes: condenser 1, compressor 2, expansion valve 3, chiller 4, water pump 5, battery 6, refrigerant pipe 7, coolant pipe 8, and temperature sensor 9.

[0132] During refrigeration, the refrigerant circulates in refrigerant pipe 7. The high-temperature, low-pressure refrigerant is compressed by compressor 2, transforming into a high-temperature, high-pressure gaseous state. As the refrigerant passes through condenser 1, it exchanges heat with the air, allowing the air to carry away heat and lower the refrigerant's temperature. This causes a phase change, transforming the refrigerant from a high-temperature, high-pressure gaseous state to a low-temperature, high-pressure liquid state. The liquid refrigerant continues to flow towards expansion valve 3 due to pressure.

[0133] The liquid refrigerant is throttled at expansion valve 3, and then evaporates. Evaporation is a heat-absorbing process for the refrigerant. The refrigerant absorbs heat from the battery coolant through chiller 4. After throttling, the refrigerant's pressure decreases while its temperature rises due to heat absorption, resulting in a phase change—from a low-temperature, low-pressure liquid to a high-temperature, low-pressure gas. The high-temperature, low-pressure refrigerant is then compressed again by compressor 2, and the refrigerant continues this cycle of heat exchange.

[0134] Figure 4 The water pump 5 rotates, driving the battery coolant to circulate in the coolant pipe 8. As the coolant passes through the battery 6, it exchanges heat with the battery, carrying away heat and raising its temperature. The coolant then exchanges heat with the refrigerant through the chiller 4, transferring the heat to the refrigerant for cooling and heat dissipation.

[0135] Based on the same technical concept, the present invention also provides a block diagram of a battery cooling control strategy for new energy vehicles, such as... Figure 5 As shown, it includes a coolant temperature sensor, expansion valve shut-off valve, water pump, thermal management domain controller, compressor, vehicle controller, chassis controller, battery controller, vehicle controller, motor controller, and CAN communication bus.

[0136] The thermal management domain controller includes two systems: an air conditioning controller and a thermal management controller. During control, it can efficiently distribute heat flow between the air conditioning and thermal management systems, and manage the air conditioning cooling demand and battery cooling demand more efficiently.

[0137] The compressor is a device that provides cooling for air conditioning and batteries. The thermal management domain controller sends control signals to the compressor via a communication bus, controlling the compressor to operate at a set speed. Simultaneously, the compressor feeds back its operating status to the thermal management domain controller via the communication bus. The thermal management domain controller adjusts its control status in real time based on the compressor's condition.

[0138] The vehicle controller, chassis controller, battery controller, vehicle controller, and motor controller are external controllers that interact with the thermal management domain controller via a communication bus to determine the human-machine interaction and the vehicle's operating conditions.

[0139] A water pump is a device that drives the circulation of coolant in the battery cooling circuit, using the coolant to remove heat from inside the battery.

[0140] The expansion valve shut-off valve is a refrigerant circuit opening device in the battery cooling circuit. By opening the expansion valve shut-off valve, the refrigerant begins to circulate under the operation of the compressor, and the refrigeration operation begins.

[0141] The coolant temperature sensor is a signal acquisition device for the thermal management domain controller, used to determine the coolant temperature.

[0142] The thermal management domain controller receives bus signals such as vehicle speed, battery cooling temperature, battery cooling request, battery charging status, current battery temperature, and other operations via the communication bus. It also collects coolant temperature sensor signals via hardwired acquisition, analyzes and processes them, and then controls the speed of the electric compressor, the speed of the battery water pump, and the opening and closing of the expansion valve shut-off valve according to different operating conditions to achieve the purpose of battery cooling.

[0143] Based on the same technical concept, this invention also provides a battery cooling control flowchart for new energy vehicles, such as... Figure 6 As shown.

[0144] Based on the same technical concept, the present invention also provides a battery cooling device for new energy vehicles, such as... Figure 7As shown, the device includes:

[0145] The acquisition module 701 is used to acquire the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant, when it is determined that the battery has a cooling requirement.

[0146] The lookup module 702 is used to look up the initial temperature of the coolant in a preset data table based on the battery cooling temperature and the outdoor ambient temperature. The preset data table contains the correspondence between the battery cooling temperature, the outdoor ambient temperature and the initial temperature of the coolant.

[0147] The determination module 703 is used to determine the target temperature of the coolant if the current battery temperature cannot reach the battery cooling temperature after cooling the battery according to the initial temperature of the coolant.

[0148] The adjustment module 704 is used to adjust the temperature of the coolant according to the target temperature of the coolant so that the current battery temperature reaches the battery cooling temperature.

[0149] Optionally, the determination module 703 is used for:

[0150] Get the current coolant temperature;

[0151] If the current coolant temperature is higher than the initial coolant temperature, the compressor will be started to cool the coolant, which will be used to cool the battery.

[0152] Get the current battery temperature after cooling;

[0153] It has been determined that the current battery temperature after cooling is different from the battery cooling temperature.

[0154] Optionally, the determination module 703 is used for:

[0155] Obtain the set coefficient and determine the temperature difference between the current battery temperature and the battery cooling temperature;

[0156] Determine the product between the set coefficient and the temperature difference;

[0157] The target temperature of the coolant is determined based on the difference between the initial temperature of the coolant and the product value.

[0158] Optionally, the adjustment module 704 is used for:

[0159] If the temperature of the coolant after cooling is higher than the target temperature of the coolant, the battery cooler will be turned on, and the temperature of the coolant will be reduced to the target temperature of the coolant through the battery cooler and the compressor.

[0160] If the temperature of the cooled liquid after cooling is lower than the target temperature of the cooled liquid, the battery cooler will remain in the off state, and the temperature of the cooled liquid will be controlled to rise to the target temperature of the cooled liquid.

[0161] Optionally, the adjustment module 704 is used for:

[0162] The temperature of the coolant is reduced by a battery cooler and a compressor;

[0163] If the coolant temperature is lower than the target coolant temperature and the compressor speed is higher than the minimum speed, then the compressor speed will be reduced.

[0164] If the coolant temperature is still lower than the target coolant temperature when the compressor speed is reduced to the minimum speed, then the compressor should be turned off until the coolant temperature reaches the target coolant temperature.

[0165] Optionally, module 701 is used for:

[0166] Get the current vehicle speed;

[0167] Based on the preset correspondence, determine the cooling threshold corresponding to the current vehicle speed and outdoor ambient temperature;

[0168] If the current battery temperature is higher than the cooling threshold, then the battery is determined to have a cooling requirement.

[0169] Optionally, the device is also used for:

[0170] Set the upper and lower limits of the target coolant temperature.

[0171] According to another aspect of the embodiments of this application, this application provides an electronic device, such as... Figure 8 As shown, the system includes a memory 803, a processor 801, a communication interface 802, and a communication bus 804. The memory 803 stores a computer program that can run on the processor 801. The memory 803 and the processor 801 communicate through the communication interface 802 and the communication bus 804. When the processor 801 executes the computer program, it implements the steps of the above method.

[0172] The memory and processor in the aforementioned electronic devices communicate with each other via a communication bus and communication interface. The communication bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc.

[0173] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0174] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0175] According to another aspect of the embodiments of this application, a computer-readable medium having processor-executable non-volatile program code is also provided.

[0176] Optionally, in embodiments of this application, the computer-readable medium is configured to store program code for a processor to execute the above-described methods.

[0177] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0178] In specific implementation, the embodiments of this application can be referred to the above embodiments and have corresponding technical effects.

[0179] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions of this application, or combinations thereof.

[0180] For software implementation, the techniques described herein can be implemented through units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented within the processor or external to the processor.

[0181] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0182] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0183] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0184] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0185] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0186] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks. It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the absence of further restrictions, an element defined by the phrase "includes a..." does not preclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0187] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A battery cooling method for a new energy vehicle, characterized in that, The method includes: When it is determined that the battery has a cooling requirement, the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant are obtained, wherein the battery cooling temperature is the highest temperature on each part of the battery. The initial temperature of the coolant is found in a preset data table based on the battery cooling temperature and the outdoor ambient temperature. The preset data table contains the correspondence between the battery cooling temperature, the outdoor ambient temperature and the initial temperature of the coolant. If the current battery temperature cannot reach the battery cooling temperature after cooling the battery according to the initial temperature of the coolant, then the target temperature of the coolant is determined according to the current battery temperature, the battery cooling temperature and the initial temperature of the coolant. The coolant temperature is adjusted according to the target coolant temperature so that the current battery temperature reaches the battery cooling temperature. Determining the target coolant temperature based on the current battery temperature, the battery cooling temperature, and the initial coolant temperature includes: Obtain the set coefficient and determine the temperature difference between the current battery temperature and the battery cooling temperature; Determine the product value between the set coefficient and the temperature difference; The target temperature of the coolant is determined based on the difference between the initial temperature of the coolant and the product value.

2. The method according to claim 1, characterized in that, After cooling the battery according to the initial temperature of the coolant, the current battery temperature cannot reach the battery cooling temperature, including: Get the current coolant temperature; If the current coolant temperature is greater than the initial coolant temperature, then the compressor is activated to cool the coolant, wherein the coolant is used to cool the battery. Get the current battery temperature after cooling; It is determined that the current battery temperature after cooling is different from the battery cooling temperature.

3. The method according to claim 2, characterized in that, Adjusting the coolant temperature according to the target coolant temperature includes: If the temperature of the cooled liquid after cooling is higher than the target temperature of the cooled liquid, the battery cooler is turned on, and the temperature of the cooled liquid is reduced to the target temperature of the cooled liquid through the battery cooler and the compressor. If the temperature of the cooled liquid after cooling is lower than the target temperature of the cooled liquid, the battery cooler is kept in the off state, and the temperature of the cooled liquid is controlled to rise to the target temperature of the cooled liquid.

4. The method according to claim 3, characterized in that, Lowering the coolant temperature to the target coolant temperature using a battery cooler and compressor includes: The temperature of the coolant is reduced by a battery cooler and a compressor; If the temperature of the coolant is lower than the target temperature of the coolant and the speed of the compressor is greater than the minimum speed, then the speed of the compressor is controlled to be reduced. If the compressor speed is reduced to the minimum speed and the coolant temperature is still lower than the target coolant temperature, then the compressor is turned off until the coolant temperature reaches the target coolant temperature.

5. The method according to claim 1, characterized in that, Determining if the battery requires cooling includes: Get the current vehicle speed; Based on a preset correspondence, determine the cooling threshold corresponding to the current vehicle speed and the outdoor ambient temperature; If the current battery temperature is greater than the cooling threshold, then it is determined that the battery has a cooling requirement.

6. The method according to claim 1, characterized in that, Before determining the target coolant temperature, the method further includes: Set the upper and lower limits of the target temperature for the coolant.

7. A battery cooling device for a new energy vehicle used in performing the battery cooling method of a new energy vehicle according to claim 1, characterized in that, The device includes: The acquisition module is used to acquire the outdoor ambient temperature and the battery cooling temperature when the battery enters the coolant when it is determined that the battery has a cooling requirement. The battery cooling temperature is the highest temperature on each part of the battery. The lookup module is used to look up the initial temperature of the coolant in a preset data table based on the battery cooling temperature and the outdoor ambient temperature. The preset data table contains the correspondence between the battery cooling temperature, the outdoor ambient temperature and the initial temperature of the coolant. The determination module is used to determine the target temperature of the coolant based on the current battery temperature, the battery cooling temperature, and the initial temperature of the coolant if the current battery temperature cannot reach the battery cooling temperature after cooling the battery according to the initial temperature of the coolant. The adjustment module is used to adjust the temperature of the coolant according to the target temperature of the coolant so that the current battery temperature reaches the battery cooling temperature; The determining module is used for: Obtain the set coefficient and determine the temperature difference between the current battery temperature and the battery cooling temperature; Determine the product value between the set coefficient and the temperature difference; The target temperature of the coolant is determined based on the difference between the initial temperature of the coolant and the product value.

8. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method of any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-6.

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