Thermal management method, system and equipment for battery pack

Abstract

The invention relates to the field of new energy batteries, and provides a thermal management method, system and equipment of a battery pack, the battery pack is provided with a liquid cooling assembly, the thermal management method is applied to the charging process of the battery pack, and the thermal management method comprises the following steps: acquiring the cell temperature of the battery pack and the environment temperature T environment of the battery pack in real time; the water gap temperature Tinlet of the liquid cooling assembly is obtained in real time; executing a thermal management strategy of the battery pack according to the battery cell temperature, the environment temperature T and the water gap temperature Tinlet; and the thermal management strategy of the battery pack is adjusted according to the cell temperature, the environment temperature T and the water gap temperature Tinlet in the process of executing the thermal management strategy, thermal management is performed on the battery by dividing the temperature interval, and the temperature of the battery during charging is effectively controlled.

Description

Technical Field

[0001] The present invention relates to the field of new energy batteries, and in particular to a thermal management method, system and device for a battery pack. Background Art

[0002] New energy power batteries are widely used in various electric vehicles due to their high efficiency and environmentally friendly properties. However, the charging and discharging of battery cells generates a significant amount of heat, which directly affects the lifespan and safety of the battery pack. Therefore, when designing and using battery packs, the heat generated by the battery cells should be fully considered, and appropriate thermal management designs and strategies should be implemented to prevent and minimize the negative impact of battery heat. Advanced thermal management systems (such as liquid cooling or direct cooling) are complex to design and have high manufacturing and maintenance costs, making them unsuitable for large-scale deployment, especially in mid-range and low-end vehicles. In large-capacity battery packs, temperature differences between individual cells (which can reach over 5°C) can lead to inconsistent performance and accelerate the aging of some cells. Phase change materials and air cooling are particularly poor at controlling temperature differences. In extremely cold environments, the heating system can consume significant energy, affecting battery life. Furthermore, the battery can suffer from low-temperature charging efficiency and insufficient thermal management response. Summary of the Invention

[0003] The object of the present invention is to provide a thermal management method, system and device for a battery pack, which effectively controls the temperature of the battery during charging.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: a thermal management method for a battery pack, wherein the battery pack has a liquid cooling component, and the thermal management method is applied to the charging process of the battery pack, comprising the following steps: obtaining the cell temperature of the battery pack and the ambient temperature T of the battery pack in real time; 环境 ; Real-time acquisition of the water outlet temperature T of the liquid cooling component inlet ; According to the battery core temperature, ambient temperature T 环境 and the water outlet temperature T inlet Execute the thermal management strategy of the battery pack; according to the battery cell temperature and the ambient temperature T during the execution of the thermal management strategy 环境 and the water outlet temperature T inlet , adjust the thermal management strategy of the battery pack.

[0005] Furthermore, the thermal management strategy includes: room temperature self-circulation strategy, high temperature cooling strategy, low temperature heating strategy; the thermal management strategy according to the battery cell temperature, ambient temperature T 环境 and water outlet temperature T inlet Executing the thermal management strategy of the battery pack includes: 环境 and the water outlet temperature T inletDetermine whether the preset temperature judgment condition of the room temperature self-circulation strategy, the temperature judgment condition of the high-temperature cooling strategy or the temperature judgment condition of the low-temperature heating strategy is met; in response to meeting the temperature judgment condition, execute the thermal management strategy corresponding to the temperature judgment condition.

[0006] Furthermore, the room temperature self-circulation strategy is: heat exchange is performed on the battery pack through the self-circulation of the water pump of the liquid cooling component; the high-temperature cooling strategy is: heating the coolant of the liquid cooling component of the battery pack through the heating element of the liquid cooling component; the low-temperature heating strategy is: cooling the battery pack through the compressor of the liquid cooling component.

[0007] Furthermore, the real-time acquisition of the battery cell temperature of the battery pack includes: real-time acquisition of the maximum temperature T of the battery cells in the battery pack max , minimum temperature T min ; Calculate the average temperature T of multiple cells in the battery pack avg ; Calculate the temperature difference T of the battery cell of the battery pack delta .

[0008] Furthermore, the temperature judgment condition of the room temperature self-circulation strategy is: the first room temperature judgment condition, the second room temperature judgment condition or the third room temperature judgment condition; the first room temperature judgment condition is: the maximum temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet The second room temperature judgment condition is: the lowest temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, water outlet temperature T inlet Greater than the sixth temperature; the third room temperature judgment condition is: temperature difference T delta is not less than the first temperature difference, does not meet the temperature judgment condition of the high temperature cooling strategy and the temperature judgment condition of the low temperature heating strategy; the high temperature judgment condition is: the minimum temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, the water outlet temperature T inlet Not greater than the sixth temperature; the temperature judgment condition for low-temperature fast charging is: the first low-temperature judgment condition or the second low-temperature judgment condition; the first low-temperature judgment condition is: the ambient temperature T 环境 Greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Not less than the third temperature; the second low temperature judgment condition is: the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature Tmax Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, water outlet temperature T inlet Not less than the third temperature; wherein, the sixth temperature is greater than the third temperature, the ninth temperature is greater than the first temperature, and the tenth temperature is greater than the second temperature.

[0009] Furthermore, when the thermal management strategy executed is the room temperature self-circulation strategy, the battery core temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: real-time monitoring of the battery cell temperature, ambient temperature T 环境 and the water outlet temperature T inlet When the temperature of the battery cell of the battery pack meets the temperature judgment condition of the low-temperature heating strategy, the low-temperature heating strategy is executed; when the temperature difference T delta Less than the second temperature difference, temperature T min Not less than the seventh temperature, average temperature T avg When the temperature is not greater than the thirteenth temperature, the room temperature self-circulation strategy is stopped and the temperature is reset according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the minimum temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T in When the temperature difference is not greater than the sixth temperature, the high-temperature cooling strategy is executed; wherein the second temperature difference is less than the first temperature difference.

[0010] Furthermore, when the thermal management strategy executed is the high temperature cooling strategy, the battery core temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: when the water outlet temperature T inlet When the temperature is lower than the first water outlet judgment temperature, the battery core temperature and the ambient temperature T are monitored in real time. 环境 and the water outlet temperature T inlet ; When the temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature is greater than the thirteenth temperature or temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T deltaWhen the temperature difference is greater than the second temperature difference, the room temperature self-circulation strategy is executed; when the temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and after the first time, the room temperature self-circulation strategy is stopped and the temperature is reset according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet Executing a thermal management strategy for the battery pack; wherein the seventh temperature is greater than the fourth temperature, and the eighth temperature is greater than the fifth temperature.

[0011] Furthermore, when the thermal management strategy executed is the low temperature heating strategy, the battery cell temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: when the water outlet temperature T inlet When the temperature is lower than the second water outlet judgment temperature, the battery core temperature and the ambient temperature T are monitored in real time. 环境 and the water outlet temperature T inlet ; When the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and the room temperature self-circulation strategy is stopped after the first time, the water pump self-circulation is turned off after the first time, and the temperature is re-calculated according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the ambient temperature T 环境 Greater than the twelfth temperature, the maximum temperature T max Not less than the first temperature, the average temperature T avg Not less than the second temperature, the nozzle temperature T inlet When the ambient temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, the water outlet temperature T inletWhen the temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference, the room temperature self-circulation strategy is executed; wherein, the first temperature is less than the fifteenth temperature, the second temperature is less than the sixteenth temperature, the thirteenth temperature is less than the first temperature, the fourteenth temperature is less than the second temperature, and the eleventh temperature is less than the third temperature.

[0012] On the other hand, a thermal management system for a battery pack is provided, comprising: a cell temperature acquisition module for acquiring the cell temperature of the battery pack in real time; a water outlet temperature acquisition module for acquiring the water outlet temperature T of the new energy vehicle in real time. inlet ; Execution module, according to the temperature of the battery cell, the ambient temperature T 环境 and the water outlet temperature T inlet Execute the thermal management strategy of the battery pack; adjust the module according to the battery cell temperature and the ambient temperature T when executing the thermal management strategy 环境 and the water outlet temperature T inlet , adjust the thermal management strategy of the battery pack.

[0013] On the other hand, an electronic device is provided, comprising: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned thermal management method.

[0014] Analysis reveals that the present invention discloses a battery pack thermal management method, system, and device. This method manages battery thermal performance by dividing the battery into temperature ranges, effectively controlling the battery temperature during charging. Furthermore, through optimized thermal management strategies, the ambient temperature is incorporated into the battery pack's thermal management to provide cooling. This allows the battery pack to operate in extremely cold temperatures, particularly during overcharging of lithium iron phosphate batteries. This reduces the need for premature activation of the vehicle's compressor, which frequently turns on and off during overcharging, saving energy. Furthermore, the temperature difference between the battery cells is maintained below 5°C through temperature balancing, improving the battery pack's post-charging performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0016] Figure 1 A schematic diagram of the battery pack structure.

[0017] Figure 2 A logic block diagram of a thermal management method for a battery pack according to an embodiment of the present invention.

[0018] Figure 3 A flowchart of a thermal management method for a battery pack according to an embodiment of the present invention.

[0019] Figure 4 A schematic structural diagram of a thermal management system for a battery pack according to an embodiment of the present invention.

[0020] Figure 5 Schematic diagram of the thermal management effect of traditional battery low-temperature fast charging.

[0021] Figure 6 This is a schematic diagram of the low-temperature fast charging thermal management effect of the present invention.

[0022] Explanation of the accompanying symbols: 1. Battery cell; 2. Box body; 3. Water inlet; 4. Water outlet; 5. Liquid cooling plate; 6. Bottom guard plate. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0024] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and the description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first," "second," "third," and "fourth," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0026] It should be noted that if Figure 1 As shown, the battery pack of the embodiment of the present application may include multiple cells to meet different power requirements. The shape of the cell of the embodiment of the present application can be set according to the actual application. For example, the cell can be as follows Figure 1 The rectangular parallelepiped or other shapes shown, or may be different from Figure 1 As shown, the embodiments of the present application are not limited thereto.

[0027] The battery pack used in this method utilizes a CTP (cell to pack) layout. In practice, this method is applicable to other types of battery packs. When a battery pack utilizes a liquid-cooled thermal management system, it may include a liquid-cooling assembly having a water inlet 3, a water outlet 4, and a liquid cooling plate 5, a battery cell 1, a housing 2, and a bottom shield 6. The battery cell 1 is mounted within the housing 2. The liquid cooling plate 5 is attached to the bottom of the housing 2 and communicates with the water inlet 3 and water outlet 4. The bottom shield 6 is positioned at the bottom of the liquid cooling plate 5. Coolant, which can be 50% ethylene glycol, is introduced through the water inlet 3 to heat and cool the battery cell 1 during charging and discharging. The thermal management method of this application is applied during the charging process of the battery pack. The liquid-cooling assembly also includes a water pump, a compressor, and a heating element. The water pump directs coolant into the liquid cooling plate 5 through the water inlet 3 and out through the water outlet 4. The heating element may be a PTC heating element. The refrigeration (cooling) function is achieved through the compressor, and the heating function is achieved through the heating element. It should be noted that the compressor can be the compressor of the entire vehicle, which provides the refrigeration function for the entire vehicle, that is, the same compressor is used for cooling the passenger compartment and the battery pack.

[0028] The fast charging and super charging referred to in this method are generally classified by charging power. Usually, the fast charging power is 60kW~130kW; the super charging power is ≥230kW. The thermal management method of the present invention can be applied to the fast charging and super charging processes of the battery pack.

[0029] like Figure 2-Figure 4 As shown, according to an embodiment of the present invention, a thermal management method for a battery pack is provided, which includes the following steps, wherein: Figure 2 In the example, BMS_ThermalManagementReg=0 means that the battery pack is not in thermal management strategy, BMS_ThermalManagementReg=1 means that the battery pack is in low temperature heating strategy, BMS_ThermalManagementReg=2 means that the battery pack is in high temperature cooling strategy, BMS_ThermalManagementReg=3 means that the battery pack is in room temperature self-circulation strategy, and BMS_WaterTempTarget is the water outlet temperature T inlet The target temperature, the initial water temperature is set to 25 ℃ refers to the initial setting of the water outlet temperature T inlet The target water temperature and the initial requested current of 5A refer to the charging current signal value requested by the battery pack controller:

[0030] Step S101: Get the battery pack's cell temperature and ambient temperature T in real time. 环境 .

[0031] Step S102: Real-time acquisition of the water outlet temperature T of the liquid cooling component inlet ;

[0032] Step S103: According to the battery cell temperature and the ambient temperature T 环境 and water outlet temperature T inlet Implement thermal management strategies for battery packs;

[0033] Step S104: When executing the thermal management strategy, the battery cell temperature and the ambient temperature T 环境 and water outlet temperature T inlet , adjust the thermal management strategy of the battery pack.

[0034] The above steps are introduced below in conjunction with specific embodiments.

[0035] First, in step S101, the above-mentioned acquisition of the battery cell temperature of the battery pack includes:

[0036] Get the maximum temperature T of the battery cell in the battery pack in real time max , minimum temperature T min ; Calculate the average temperature T of multiple cells in the battery pack avg ; Calculate the temperature difference T of the battery pack's cells delta Specifically, the maximum temperature of the battery cell in the battery pack is T max , minimum temperature T min It reflects the extreme temperature of the battery cell, the average temperature of multiple battery cells T avg ; The temperature difference T of the battery pack's cells delta The temperature uniformity of the battery cells is reflected in the four temperatures mentioned above. They can clearly reflect the temperature status of the battery pack. Only based on the clear temperature status of the battery pack can the thermal management strategy of the battery pack be confirmed. A distributed temperature sensor network can be used to obtain the temperature of the battery cells in real time. The temperature sensor network includes multiple temperature detection nodes, each of which is equipped with at least one temperature sensor. The temperature sensor network collects the temperature of all battery cells. For example, each battery cell is equipped with several NTC (Negative Temperature Coefficient) temperature sensors, and the data sampling frequency can be 1Hz.

[0037] Ambient temperature T 环境 Alternatively, the temperature can be collected by a temperature sensor deployed to collect ambient temperature, such as an ambient temperature sensor located on the front bumper of the electric vehicle in which the battery pack is installed. It should be noted that this embodiment does not limit the sampling frequency of the cell temperature or the ambient temperature; the two can be the same or different.

[0038] The temperature data of the battery pack obtained by the temperature sensor can be transmitted to the Battery Management System (BMS), which receives and processes the relevant data.

[0039] Next, step S102 is involved, the water outlet temperature T inlet The temperature of the coolant at the water inlet is obtained by the temperature sensor installed at the water inlet, where the temperature of the coolant at the water inlet is called the water inlet temperature T inlet . Water outlet temperature T inlet It can be measured by a platinum resistance sensor, which is installed in the center of the coolant inlet pipe.

[0040] Next, step S103 is involved. Step S103 specifically includes: setting the thermal management strategy of the battery pack, which includes: room temperature self-circulation strategy, high temperature cooling strategy and low temperature heating strategy; setting the temperature judgment conditions of the room temperature self-circulation strategy, the temperature judgment conditions of the high temperature cooling strategy and the temperature judgment conditions of the low temperature heating strategy; according to the battery cell temperature, the ambient temperature T 环境 and water outlet temperature T inlet The satisfied temperature judgment condition determines which thermal management strategy the battery pack is to be executed, and then executes the thermal management strategy.

[0041] Specifically, the room temperature self-circulation strategy is: heat exchange is performed on the battery pack through the self-circulation of the water pump of the liquid cooling component. Exemplarily, the room temperature self-circulation strategy is that the whole vehicle does not perform cooling and heating, and the battery pack only turns on the water pump for self-circulation; its main function is to use the water temperature of the liquid cooling system (or liquid cooling component) to perform heat exchange on the battery pack. The above-mentioned water pump can allow the coolant to enter from the water inlet 3, and be discharged from the water outlet 4 after heat exchange with the battery pack. The room temperature self-circulation strategy usually aims to reduce the temperature difference T delta Keep the temperature at 5℃ or below, and charge the battery at the most suitable temperature of around 20℃-30℃.

[0042] Specifically, the high-temperature cooling strategy involves heating the coolant in the battery pack's liquid cooling assembly through the liquid cooling assembly's heating elements. For example, the vehicle begins heating the coolant through a PTC (Positive Temperature Coefficient) thermistor, thereby heating the battery pack. This high-temperature cooling strategy ensures that the battery pack rapidly heats up from a low temperature to reach its optimal operating temperature of approximately 25°C.

[0043] Specifically, the low-temperature heating strategy is to cool the battery pack through the compressor of the liquid cooling assembly. Exemplarily, the low-temperature heating strategy is to cool the coolant through the operation of the compressor of the entire vehicle, thereby quickly reducing the temperature of the battery pack.

[0044] The temperature judgment conditions of the above-mentioned room temperature self-circulation strategy are: the first room temperature judgment condition, the second room temperature judgment condition or the third room temperature judgment condition; the first room temperature judgment condition is: the maximum temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Lower than the third temperature; the second room temperature judgment condition is: the lowest temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, water outlet temperature T inlet Greater than the sixth temperature; the third room temperature judgment condition is: temperature difference T delta The temperature difference is not less than the first temperature difference, and the temperature judgment conditions of the high-temperature cooling strategy and the temperature judgment conditions of the low-temperature heating strategy are not met. For example, the first temperature is 32°C, the second temperature is 30°C, and the third temperature is 25°C; the fourth temperature is 15°C, the fifth temperature is 17°C, and the sixth temperature is 40°C. The first temperature difference is 10°C. This embodiment does not limit the specific values of each temperature, and other values can be used in other embodiments.

[0045] Specifically, the maximum temperature T max ≥32℃, average temperature T avg ≥30℃ and water outlet temperature T inlet <25℃; or the lowest temperature T min ≤15℃, average temperature T avg ≤17℃ and water outlet temperature>40℃; or temperature difference T delta ≥10℃, and when the high-temperature cooling strategy and the low-temperature heating strategy are not implemented, when the room temperature self-circulation strategy is adopted, when the battery cells in the battery pack are in the above three temperature ranges, temperature adjustment is required. However, since the temperature difference between the coolant temperature and the battery cell temperature in the above three temperature ranges is large, sufficient heat exchange can be carried out. Therefore, when the temperature is in the above three ranges, the temperature control requirements of the battery pack can be met by self-circulation of the water pump.

[0046] Specifically, the temperature judgment conditions for high-temperature fast charging are: the minimum temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, the water outlet temperature T inlet Not greater than the sixth temperature;

[0047] Specifically, when the minimum temperature of the vehicle battery pack is T min ≤15℃, average temperature T avg ≤17℃, water outlet temperature T inletWhen the temperature is less than 40℃, the vehicle's PTC starts to heat the coolant, thereby increasing the temperature of the coolant to heat the battery pack. That is, the coolant is heated by the heating element, and then the coolant heats the battery pack. This process ensures that the battery pack is quickly heated at low temperatures to reach the most suitable operating temperature of about 25℃. When the temperature of the battery cell is too low, it is directly heated without considering other temperature factors. At the same time, during the heating process, when -30℃≤the lowest temperature T min When the temperature is ≤-20℃, the fast charge relay of the battery pack will not be energized, that is, the battery pack will not be charged but only heated until the minimum temperature T min When the temperature is ≥-18℃, the fast charging relay of the battery pack is energized to heat the battery pack.

[0048] Specifically, the temperature judgment condition for low-temperature fast charging is: the first low-temperature judgment condition or the second low-temperature judgment condition; the first low-temperature judgment condition is: the ambient temperature T 环境 Greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Not less than the third temperature; the second low temperature judgment condition is: ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, water outlet temperature T inlet Not less than the third temperature;

[0049] Figure 5 This is a schematic diagram of the traditional battery low-temperature fast charging thermal management strategy. Figure 6 This is a schematic diagram of the low-temperature fast charging thermal management of the present invention. The horizontal axis in the figure is time, the left vertical axis is temperature, and the right vertical axis is the percentage of battery pack power.

[0050] Exemplarily, the ninth temperature is 40°C, the tenth temperature is 38°C, and the twelfth temperature is 0°C.

[0051] Specifically, the temperature of the battery pack of the vehicle is higher than the ambient temperature, and the ambient temperature is introduced as an indicator for judgment. When T 环境 >0℃, the maximum temperature T max ≥32℃, average temperature T avg >30℃, and the inlet water temperature T inlet ≥25℃, start cooling; if T 环境 When the temperature is less than 0℃, the battery pack will be partially cooled by the ambient temperature. max ≥40℃, average temperature T avg ≥38℃, even if T 环境 When the temperature is ≤0℃, the battery pack will be cooled by the compressor.

[0052] Specifically, the sixth temperature is greater than the third temperature, the ninth temperature is greater than the first temperature, and the tenth temperature is greater than the second temperature.

[0053] Finally, step S104 is involved. When the thermal management strategy to be executed is the room temperature self-circulation strategy, the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet , adjustments to the battery pack's thermal management strategy include:

[0054] The current thermal management strategy is the room temperature self-circulation strategy. During the execution of this thermal management strategy, the cell temperature and ambient temperature T are monitored in real time. 环境 and water outlet temperature T inlet When the temperature of the battery cell meets the temperature judgment condition of the low-temperature heating strategy, the low-temperature heating strategy is executed, that is, the thermal management strategy is adjusted from the room temperature self-circulation strategy to the low-temperature heating strategy; when the temperature difference T delta Less than the second temperature difference, temperature T min Not less than the seventh temperature, average temperature T avg When the temperature is not greater than the thirteenth temperature, stop executing the room temperature self-circulation strategy, that is, turn off the water pump self-circulation, and re-circulate according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute the thermal management strategy of the battery pack, that is, turn off the water pump self-circulation, and then jump to step 2 according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the minimum temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature difference is not greater than the sixth temperature, a high-temperature cooling strategy is executed; wherein the second temperature difference is less than the first temperature difference.

[0055] Specifically, the second temperature difference is 5°C. After executing the room temperature self-circulation strategy, when the battery cell temperature gradually increases, the maximum temperature T max When the ambient temperature is ≥32℃, the ambient temperature is introduced for strategy judgment. When the ambient temperature is low in winter, the ambient temperature T 环境 ≤0℃, considering the energy conservation and emission reduction of the whole vehicle, compared with the traditional strategy, we do not perform vehicle compressor cooling diversion, that is, there is no need to use the compressor to cool the passenger compartment, and the compressor can be fully used to cool the battery pack. Compared with T 环境 When the temperature is ≥0℃, the compressor has a stronger cooling effect on the battery pack, so the maximum temperature T max <40℃ is the threshold condition for starting the compressor cooling, that is, when the ambient temperature T 环境≤0℃, when the maximum temperature T max ≥40℃, average temperature T avg When the temperature is ≥38℃, the compressor will start cooling; when T 环境 >0℃, the maximum temperature T max ≥32℃, average temperature T avg >30℃, and the inlet water temperature T inlet When the temperature is ≥25℃, the cooling function will be turned on to ensure the reliability and safety of the battery cells.

[0056] It can be understood that the above-mentioned compressor refrigeration refers to the compressor configuration of the vehicle's air-conditioning refrigeration system. The cooling of the passenger compartment and the cooling of the battery pack of the vehicle are both carried out using the same air-conditioning compressor. Therefore, there is a power diversion distribution for cooling. Under certain conditions, part of the cooling power is given to the passenger compartment, and part of the cooling power is given to the battery pack cooling.

[0057] Specifically, after the self-circulation, if the temperature difference T delta <5℃, the battery cell temperature is maintained at the minimum temperature T min ≥20℃, average temperature T avg ≤28℃, turn off the water pump for self-circulation; if the minimum temperature T min <20℃, average temperature T avg ≤22℃, while the water outlet temperature T inlet If the temperature is ≤40℃, the vehicle starts to use PTC to heat the coolant, thereby heating the battery pack.

[0058] When the thermal management strategy is a high temperature cooling strategy, the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet , the thermal management strategy of the battery pack is adjusted including: when the water outlet temperature T inlet When the temperature is lower than the first water outlet judgment temperature, the battery cell temperature and ambient temperature T are monitored in real time. 环境 and water outlet temperature T inlet When the temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature is greater than the thirteenth temperature or temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is greater than the second temperature difference, the room temperature self-circulation strategy is executed; when the temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T deltaWhen the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and after the first time, the room temperature self-circulation strategy is stopped and the temperature is re-adjusted according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Implement thermal management strategies for the battery pack.

[0059] Specifically, the seventh temperature is greater than the fourth temperature, and the eighth temperature is greater than the fifth temperature.

[0060] Exemplarily, the first water outlet judgment temperature is 45°C, the seventh temperature is 20°C, and the eighth temperature is 22°C.

[0061] Specifically, when the water outlet temperature T inlet After reaching 45℃, the current temperature is judged. When the minimum temperature T min ≤20℃, average temperature T avg ≤22℃, and the water outlet temperature T inlet >50℃ or minimum temperature T min ≥20℃, average temperature T avg ≥22℃, while the temperature difference T delta When the temperature is >5℃, the room temperature self-circulation strategy is executed. min ≥20℃, average temperature T avg ≥22℃, while the temperature difference T delta When the temperature is less than 5℃, the water pump is turned on for self-circulation to improve the battery cell temperature and equalize the temperature of the battery cell, and the PTC heating is stopped. Usually, the water pump is turned on for 3 minutes. When the water pump is turned off, the battery waits for the new thermal management strategy to be implemented.

[0062] When the thermal management strategy is low temperature heating strategy, the cell temperature and ambient temperature T 环境 and water outlet temperature T inlet , the thermal management strategy of the battery pack is adjusted including: when the water outlet temperature T inlet When the temperature is lower than the second water outlet judgment temperature, the battery cell temperature and ambient temperature T are monitored in real time. 环境 and water outlet temperature T inlet ; When the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T deltaWhen the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and after the first time, the room temperature self-circulation strategy is stopped and the temperature is re-adjusted according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the ambient temperature T 环境 Greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, the water outlet temperature T inlet When the ambient temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, the water outlet temperature T inlet When the temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference, the room temperature self-circulation strategy is executed; wherein, the first temperature is less than the fifteenth temperature, the second temperature is less than the sixteenth temperature, the thirteenth temperature is less than the first temperature, the fourteenth temperature is less than the second temperature, and the eleventh temperature is less than the third temperature.

[0063] Specifically, the thirteenth temperature is 28 degrees Celsius, the fourteenth temperature is 26 degrees Celsius, the fifteenth temperature is 36 degrees Celsius, the sixteenth temperature is 34 degrees Celsius, the eleventh temperature is 15 degrees Celsius, and the second water outlet judgment temperature is 20 degrees Celsius. inlet After reaching 20℃, the current temperature is judged. When the ambient temperature T 环境 >0℃, maximum temperature T max ≤28℃, average temperature T avg ≤26℃ and temperature difference T detla <5℃ or ambient temperature T 环境 >0℃ maximum temperature T max ≤36℃, average temperature T avg ≤34℃ and temperature difference T detla When the ambient temperature is less than 5℃, the water pump is turned on for self-circulation. Usually, the water pump is turned on for 3 minutes. When the water pump is turned off, the battery will wait for the new thermal management strategy to be implemented. If the ambient temperature T 环境 ≤0℃.

[0064] Specifically, after cooling, the ambient temperature T 环境 Make a judgment, when the ambient temperature T 环境 >0℃, maximum temperature T max ≥32℃, average temperature T avg ≥30℃, water outlet temperature T inlet ≤15℃ or ambient temperature T 环境 ≤0℃,T max ≥40℃, average temperature T avg ≥38℃, water outlet temperature T inlet ≤15℃, or the ambient temperature T 环境 >0℃, maximum temperature T max ≤28℃, average temperature T avg ≤26℃ and temperature difference T detla >5℃ or ambient temperature T 环境 >0℃ maximum temperature T max ≤36℃, average temperature T avg ≤34℃ and temperature difference T detla When the ambient temperature is >5℃, the room temperature self-circulation strategy is executed, that is, the water pump is turned on for self-circulation to cool the battery pack evenly. It can be seen that when the ambient temperature T 环境 When the temperature is less than 0℃, the core temperature of the battery cell of the present invention can be kept below the maximum temperature T max ≤36℃, average temperature T avg Before the temperature reaches 34℃, the water pump will continue to circulate automatically without starting the compressor for refrigeration.

[0065] Specifically, after the initial thermal management strategy is implemented, the battery pack is managed again according to the subsequent temperature state of the battery pack. The above-mentioned temperature adjustment of the battery pack can be to execute a thermal management strategy again or stop the thermal management of the battery pack. It should be noted that after each execution of the thermal management strategy, the battery pack is managed again according to the subsequent temperature state of the battery pack until the battery pack charging is completed.

[0066] like Figure 4 As shown, the present invention also discloses a thermal management system for a battery pack, including: a cell temperature acquisition module 201 , a water outlet temperature acquisition module 202 , an execution module 203 and an adjustment module 204 .

[0067] Among them, the battery cell temperature acquisition module 201 acquires the battery cell temperature of the battery pack in real time. The water outlet temperature acquisition module 202 acquires the water outlet temperature T of the new energy vehicle in real time. inlet Execute module 203, according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inletExecute the thermal management strategy of the battery pack. Adjustment module 204, according to the ambient temperature T after executing the thermal management strategy 环境 , the temperature of the battery pack's cells and the water outlet temperature T of new energy vehicles inlet The temperature of the battery pack is adjusted according to the temperature of the battery pack.

[0068] Furthermore, the cell temperature acquisition module 201 acquires the cell temperature of the battery pack in real time: the maximum temperature T of the cells in the battery pack is acquired in real time. max , minimum temperature T min ; Calculate the average temperature T of multiple cells in the battery pack avg ; Calculate the temperature difference T of the battery pack's cells delta .

[0069] Furthermore, the thermal management strategies executed by the execution module 203 include: room temperature self-circulation strategy, high temperature cooling strategy, low temperature heating strategy; according to the battery cell temperature, the ambient temperature T 环境 and water outlet temperature T inlet The thermal management strategy for the battery pack includes: 环境 and water outlet temperature T inlet Determine whether the preset temperature judgment condition of the room temperature self-circulation strategy, the temperature judgment condition of the high temperature cooling strategy or the temperature judgment condition of the low temperature heating strategy is met; in response to the temperature judgment condition being met, execute the thermal management strategy corresponding to the temperature judgment condition.

[0070] Furthermore, the room temperature self-circulation strategy is: heat exchange of the battery pack is carried out through the self-circulation of the water pump of the liquid cooling component; the high temperature cooling strategy is: heating the coolant of the liquid cooling component of the battery pack through the heating element of the liquid cooling component; the low temperature heating strategy is: cooling the battery pack through the compressor of the liquid cooling component.

[0071] Furthermore, the temperature judgment condition of the room temperature self-circulation strategy is: the first room temperature judgment condition, the second room temperature judgment condition or the third room temperature judgment condition; the first room temperature judgment condition is: the maximum temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Lower than the third temperature; the second room temperature judgment condition is: the lowest temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, water outlet temperature T iletn Greater than the sixth temperature; the third room temperature judgment condition is: temperature difference T delta Not less than the first temperature difference, not meeting the temperature judgment conditions of the high temperature cooling strategy and the temperature judgment conditions of the low temperature heating strategy; the high temperature judgment condition is: the minimum temperature T min Not greater than the fourth temperature, average temperature T avgNot greater than the fifth temperature, the water outlet temperature T inlet Not greater than the sixth temperature; the temperature judgment condition for low-temperature fast charging is: the first low-temperature judgment condition or the second low-temperature judgment condition; the first low-temperature judgment condition is: the ambient temperature Tenvironment is greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Not less than the third temperature; the second low temperature judgment condition is: the ambient temperature Tenvironment is not greater than the twelfth temperature, the highest temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, water outlet temperature T inlet Not less than the third temperature; wherein, the sixth temperature is greater than the third temperature, the ninth temperature is greater than the first temperature, and the tenth temperature is greater than the second temperature.

[0072] Furthermore, the adjustment module 204 includes a room temperature self-circulation adjustment unit. When the thermal management strategy executed is the room temperature self-circulation strategy, the room temperature self-circulation adjustment unit adjusts the temperature of the battery cell and the ambient temperature T according to the thermal management strategy. 环境 and water outlet temperature T inlet , adjust the thermal management strategy of the battery pack including: real-time monitoring of battery cell temperature, ambient temperature T 环境 and water outlet temperature T inlet ; When the temperature of the battery pack's cells meets the temperature judgment condition of the low-temperature heating strategy, the low-temperature heating strategy is executed; when the temperature difference T delta Less than the second temperature difference, temperature T min Not less than the seventh temperature, average temperature T avg When the temperature is not greater than the thirteenth temperature, stop executing the room temperature self-circulation strategy and re-set the temperature according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the minimum temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature difference is not greater than the sixth temperature, a high-temperature cooling strategy is executed; wherein the second temperature difference is less than the first temperature difference.

[0073] Furthermore, the adjustment module 204 includes a high temperature cooling adjustment unit. When the thermal management strategy executed is a high temperature cooling strategy, the high temperature cooling adjustment unit adjusts the temperature of the battery cell and the ambient temperature T according to the thermal management strategy. 环境 and water outlet temperature T inlet , the thermal management strategy of the battery pack is adjusted including: when the water outlet temperature T inlet When the temperature is lower than the first water outlet judgment temperature, the battery cell temperature and ambient temperature T are monitored in real time. 环境 and water outlet temperature Tinlet When the temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature is greater than the thirteenth temperature or temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is greater than the second temperature difference, the room temperature self-circulation strategy is executed; when the temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and after the first time, the room temperature self-circulation strategy is stopped and the temperature is re-adjusted according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute a thermal management strategy for the battery pack; wherein the seventh temperature is greater than the fourth temperature, and the eighth temperature is greater than the fifth temperature.

[0074] Furthermore, the adjustment module 204 includes a low temperature heating adjustment unit. When the thermal management strategy executed is the low temperature heating strategy, the low temperature heating adjustment unit adjusts the temperature of the battery cell and the ambient temperature T according to the thermal management strategy. 环境 and water outlet temperature T inlet , the thermal management strategy of the battery pack is adjusted including: when the water outlet temperature T inlet When the temperature is lower than the second water outlet judgment temperature, the battery cell temperature and ambient temperature T are monitored in real time. 环境 and water outlet temperature T inlet ;

[0075] When the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and the room temperature self-circulation strategy is stopped after the first time. After the first time, the water pump self-circulation is turned off and the temperature is re-adjusted according to the temperature of the battery cell and the ambient temperature T 环境 and water outlet temperature T inlet Execute the thermal management strategy of the battery pack; when the ambient temperature T 环境 Greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature Tavg Not less than the second temperature, the water outlet temperature T inlet When the ambient temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, the water outlet temperature T inlet When the temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the thirteenth temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference, the room temperature self-circulation strategy is executed; wherein, the first temperature is less than the fifteenth temperature, the second temperature is less than the sixteenth temperature, the thirteenth temperature is less than the first temperature, the fourteenth temperature is less than the second temperature, and the eleventh temperature is less than the third temperature.

[0076] An embodiment of the present invention provides an electronic device, comprising: a memory and a processor. The processor is connected to the memory and is configured to execute the above-mentioned thermal management method based on instructions stored in the memory. The number of processors can be one or more, and the processor can be single-core or multi-core. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip. The memory can be an example of the computer-readable medium described below.

[0077] An embodiment of the present invention provides a computer-readable storage medium having stored thereon at least one instruction, at least one program, code set, or instruction set, which is loaded and executed by a processor to implement the above-mentioned thermal management method. Computer-readable storage media include: permanent and non-permanent, removable and non-removable media can implement information storage by any method or technology. The information can be a computer-readable instruction, a data structure, a program module, or other data. Examples of computer storage media include, but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disc-read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0078] The present invention also discloses a computer program product comprising instructions, which enables the above method to be executed by the computer when the computer program product is run on the computer.

[0079] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the present invention performs thermal management on the battery by dividing the temperature interval, effectively controls the temperature of the battery during charging, and introduces the cooling effect of the ambient temperature on the thermal management of the battery pack through the optimization of the thermal management strategy. The battery pack is used in extremely cold temperatures, especially the lithium iron phosphate battery can reduce the number of times the compressor cooling of the entire vehicle is turned on and off during the supercharging process, while saving energy consumption. The temperature difference of the battery pack cells is made less than 5°C through the temperature equalization effect, thereby improving the performance of the battery pack after charging.

[0080] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A thermal management method for a battery pack having a liquid cooling assembly, characterized in that: The thermal management method is applied during the charging process of the battery pack, and includes the following steps: Real-time acquisition of the battery pack's cell temperature and the battery pack's ambient temperature T 环境 ; Real-time acquisition of the water outlet temperature T of the liquid cooling component inlet ; According to the battery core temperature, ambient temperature T 环境 and the water outlet temperature T inlet executing a thermal management strategy for the battery pack; According to the battery core temperature and the ambient temperature T during the execution of the thermal management strategy 环境 and the water outlet temperature T inlet , adjust the thermal management strategy of the battery pack.

2. The thermal management method of a battery pack according to claim 1, characterized in that: The thermal management strategies include: room temperature self-circulation strategy, high temperature cooling strategy, and low temperature heating strategy; According to the battery core temperature, the ambient temperature T 环境 and water outlet temperature T inlet Executing the thermal management strategy of the battery pack includes: According to the battery core temperature, the ambient temperature T 环境 and the water outlet temperature T inlet Determine whether the preset temperature judgment condition of the room temperature self-circulation strategy, the temperature judgment condition of the high temperature cooling strategy, or the temperature judgment condition of the low temperature heating strategy is met; In response to the temperature judgment condition being satisfied, a thermal management strategy corresponding to the temperature judgment condition is executed.

3. The thermal management method of a battery pack according to claim 2, characterized in that: The room temperature self-circulation strategy is: heat exchange of the battery pack is performed by the water pump self-circulation of the liquid cooling component; The high-temperature cooling strategy is: heating the coolant of the liquid cooling assembly of the battery pack by the heating element of the liquid cooling assembly; The low-temperature heating strategy is to cool the battery pack by using the compressor of the liquid cooling assembly.

4. The thermal management method of a battery pack according to claim 2, characterized in that: The real-time acquisition of the battery cell temperature of the battery pack includes: Real-time acquisition of the maximum temperature T of the battery cells in the battery pack max , minimum temperature T min ; Calculate the average temperature T of multiple cells in the battery pack avg ; Calculate the temperature difference T of the battery cell of the battery pack delta .

5. The thermal management method of a battery pack according to claim 4, characterized in that: The temperature judgment condition of the room temperature self-circulation strategy is: the first room temperature judgment condition, the second room temperature judgment condition or the third room temperature judgment condition; The first room temperature judgment condition is: the maximum temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet less than the third temperature; The second room temperature judgment condition is: the minimum temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, water outlet temperature T inlet greater than the sixth temperature; The third room temperature judgment condition is: the temperature difference T delta is not less than the first temperature difference, and does not meet the temperature judgment condition of the high-temperature cooling strategy and the temperature judgment condition of the low-temperature heating strategy; The high temperature judgment condition is: the minimum temperature T min Not greater than the fourth temperature, average temperature T avg Not greater than the fifth temperature, the water outlet temperature T inlet Not greater than the sixth temperature; The temperature judgment condition for low-temperature fast charging is: a first low-temperature judgment condition or a second low-temperature judgment condition; The first low temperature judgment condition is: the ambient temperature T 环境 Greater than the twelfth temperature, the highest temperature T max Not less than the first temperature, average temperature T avg Not less than the second temperature, water outlet temperature T inlet Not less than the third temperature; The second low temperature judgment condition is: the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, water outlet temperature T inlet Not less than the third temperature; The sixth temperature is greater than the third temperature, the ninth temperature is greater than the first temperature, and the tenth temperature is greater than the second temperature.

6. The thermal management method of a battery pack according to claim 5, characterized in that: When the thermal management strategy executed is the room temperature self-circulation strategy, the core temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: Real-time monitoring of the battery cell temperature and ambient temperature T 环境 and the water outlet temperature T inlet ; When the temperature of the battery cell of the battery pack meets the temperature judgment condition of the low-temperature heating strategy, executing the low-temperature heating strategy; When the temperature difference T delta Less than the second temperature difference, temperature T min Not less than the seventh temperature, average temperature T avg When the temperature is not greater than the thirteenth temperature, the room temperature self-circulation strategy is stopped and the temperature is reset according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet executing a thermal management strategy for the battery pack; When the minimum temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature is not greater than the sixth temperature, executing the high temperature cooling strategy; Wherein, the second temperature difference is smaller than the first temperature difference.

7. The thermal management method of a battery pack according to claim 6, characterized in that: When the thermal management strategy executed is the high temperature cooling strategy, the core temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: When the water outlet temperature T inlet When the temperature is lower than the first water outlet judgment temperature, the battery core temperature and the ambient temperature T are monitored in real time. 环境 and the water outlet temperature T inlet ; When the temperature T min Not greater than the seventh temperature, average temperature T avg Not greater than the eighth temperature, the water outlet temperature T inlet When the temperature is greater than the thirteenth temperature or temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is greater than the second temperature difference, the room temperature self-circulation strategy is executed; When the temperature T min Not less than the seventh temperature, average temperature T avg Not less than the eighth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and after the first time, the room temperature self-circulation strategy is stopped and the temperature is reset according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet executing a thermal management strategy for the battery pack; The seventh temperature is greater than the fourth temperature, and the eighth temperature is greater than the fifth temperature.

8. The thermal management method of a battery pack according to claim 6, characterized in that: When the thermal management strategy executed is the low temperature heating strategy, the battery core temperature and the ambient temperature T 环境 and the water outlet temperature T inlet , adjusting the thermal management strategy of the battery pack includes: When the water outlet temperature T inlet When the temperature is lower than the second water outlet judgment temperature, the battery core temperature and the ambient temperature T are monitored in real time. 环境 and the water outlet temperature T inlet ; When the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the 13th temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is less than the second temperature difference, the room temperature self-circulation strategy is executed, and the room temperature self-circulation strategy is stopped after the first time, the water pump self-circulation is turned off after the first time, and the temperature is re-calculated according to the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet executing a thermal management strategy for the battery pack; When the ambient temperature T 环境 Greater than the twelfth temperature, the maximum temperature T max Not less than the first temperature, the average temperature T avg Not less than the second temperature, the nozzle temperature T inlet When the ambient temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not less than the ninth temperature, average temperature T avg Not less than the tenth temperature, the water outlet temperature T inlet When the temperature is not greater than the eleventh temperature or the ambient temperature T 环境 Greater than the twelfth temperature, and the highest temperature T max Not more than the 13th temperature, average temperature T avg Not greater than the fourteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference or the ambient temperature T 环境 Not greater than the twelfth temperature, the maximum temperature T max Not more than the fifteenth temperature, average temperature T avg Not greater than the sixteenth temperature, the temperature difference T delta When the temperature difference is not less than the second temperature difference, the room temperature self-circulation strategy is executed; The first temperature is lower than the fifteenth temperature, the second temperature is lower than the sixteenth temperature, the thirteenth temperature is lower than the first temperature, the fourteenth temperature is lower than the second temperature, and the eleventh temperature is lower than the third temperature.

9. A thermal management system for a battery pack, characterized in that: include: A cell temperature acquisition module is used to obtain the cell temperature of the battery pack in real time; The water inlet temperature acquisition module obtains the water inlet temperature T of the new energy vehicle in real time inlet ; The execution module is based on the temperature of the battery cell and the ambient temperature T 环境 and the water outlet temperature T inlet executing a thermal management strategy for the battery pack; The adjustment module is configured to adjust the temperature of the battery cell and the ambient temperature T when executing the thermal management strategy. 环境 and the water outlet temperature T inlet , adjust the thermal management strategy of the battery pack.

10. An electronic device, characterized in that: The electronic device includes: a processor and a memory for storing executable instructions of the processor; The processor is configured to execute the thermal management method according to any one of claims 1 to 8.

Images