Battery pack temperature control method, device and computer equipment

Abstract

The present application relates to a temperature control method, device and computer equipment for a battery pack. The method comprises: determining the working state of the battery cell of the battery pack at the current moment; obtaining the temperature information of the battery cell at the current moment, and determining the target control mode corresponding to the battery cell at the current moment and the target preset temperature matching the target control mode according to the working state and temperature information; determining the first liquid temperature corresponding to the temperature regulating liquid at the current moment according to the temperature information and the target preset temperature; obtaining the temperature control condition corresponding to the target control mode, and determining the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid of the second liquid temperature is used to adjust the temperature of the battery cell at the current moment. The method can adjust the temperature control strategy in real time according to the battery cell temperature and working state.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and in particular to a temperature control method and device for a battery pack, a computer device, a computer-readable storage medium, and a computer program product. Background Art

[0002] Lithium battery energy storage systems are widely used due to their excellent energy density, cycle life and other characteristics. In liquid-cooled lithium battery energy storage systems, the liquid cooling thermal management system is responsible for the temperature performance of the battery cells. Through control strategies, the temperature of the coolant entering the cold plate is regulated so that the coolant and the battery cells can exchange heat, thereby making the battery cells work within a suitable temperature range.

[0003] However, the current control strategies for liquid cooling systems often use a fixed liquid supply temperature in the same mode. For example, in cooling conditions, when the cell temperature exceeds the cooling control point, the liquid cooling unit starts, and water is supplied at the set water temperature regardless of how much the cell temperature exceeds the cooling control point. This lacks flexibility and cannot quickly respond to rapid changes in cell temperature, especially when the battery is outputting high power or charging, which may cause instantaneous temperature peaks and damage the battery. Summary of the invention

[0004] Based on this, it is necessary to provide a temperature control method, device, computer equipment, computer-readable storage medium and computer program product for a battery pack that can adjust the temperature control strategy in real time according to the battery cell temperature and working status to address the above technical problems.

[0005] In a first aspect, the present application provides a temperature control method for a battery pack, comprising:

[0006] Determine the working status of the battery cells of the battery pack at the current moment;

[0007] Acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode according to the working state and the temperature information;

[0008] Determining a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information and the target preset temperature;

[0009] Acquire the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0010] In a second aspect, the present application also provides a temperature control device for a battery pack, comprising:

[0011] A first determination module, used to determine the working state of the battery cell of the battery pack at a current moment;

[0012] an acquisition module, used to acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode according to the working state and the temperature information;

[0013] A second determining module, configured to determine a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information and the target preset temperature;

[0014] A regulating module is used to obtain the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0015] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0016] Determine the working status of the battery cells of the battery pack at the current moment;

[0017] Acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode according to the working state and the temperature information;

[0018] Determining a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information and the target preset temperature;

[0019] Acquire the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0020] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0021] Determine the working status of the battery cells of the battery pack at the current moment;

[0022] Acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode according to the working state and the temperature information;

[0023] Determining a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information and the target preset temperature;

[0024] Acquire the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0025] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0026] Determine the working status of the battery cells of the battery pack at the current moment;

[0027] Acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode according to the working state and the temperature information;

[0028] Determining a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information and the target preset temperature;

[0029] Acquire the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0030] The temperature control method, device, computer equipment, computer-readable storage medium and computer program product of the battery pack ensure that the control system understands the current load condition of the battery cell (such as charge and discharge rate, current size, etc.) by determining the working state of the battery cell of the battery pack at the current moment. This helps to accurately formulate the temperature control strategy in the subsequent steps, avoids the "one-size-fits-all" control method, and makes temperature management more dynamic and flexible.

[0031] The temperature information of the battery cell at the current moment is obtained, and according to the working state and the temperature information, the target control mode corresponding to the battery cell at the current moment and the target preset temperature matching the target control mode are determined; this data-based decision-making process improves the pertinence of the control strategy, reduces unnecessary energy consumption, and ensures that the battery cell operates within an appropriate temperature range, which is beneficial to extending battery life and improving performance.

[0032] According to the temperature information and the target preset temperature, the first liquid temperature of the temperature regulating liquid corresponding to the current moment is determined, so as to effectively adjust the battery cell temperature to the target preset temperature. This is a key link in achieving dynamic temperature control, ensuring the efficiency and accuracy of the cooling or heating process.

[0033] The temperature control condition corresponding to the target control mode is obtained, and based on the first liquid temperature and the temperature control condition, the second liquid temperature corresponding to the temperature regulating liquid at the current moment is determined; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment. Finally, the working state and temperature of the battery cell are monitored in real time, and combined with a dynamic temperature control strategy, the temperature of the battery can be effectively and accurately managed to ensure that it operates in the best state, while reducing energy consumption and improving the overall efficiency and reliability of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A diagram showing an application environment of a temperature control method for a battery pack in one embodiment;

[0036] Figure 2 is a schematic flow chart of a temperature control method for a battery pack in one embodiment;

[0037] Figure 3 is a schematic flow chart of a temperature control method for a battery pack in another embodiment;

[0038] Figure 4 is a structural block diagram of a temperature control device for a battery pack in one embodiment;

[0039] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] The temperature control method of the battery pack provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. The terminal 102 is used to generate a temperature control request for the battery pack, and send the temperature control request of the battery pack to the server 104, so that the server 104 determines the second liquid temperature corresponding to the temperature regulating liquid at the current moment; the temperature regulating liquid of the second liquid temperature is used to adjust the temperature of the battery cell at the current moment. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablets, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car devices, projection devices, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 may be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0042] In an exemplary embodiment, Figure 2 As shown, a temperature control method for a battery pack is provided, and the method is applied to Figure 1 The server 104 in the example is used as an example to illustrate, including the following steps 202 to 208. Among them:

[0043] Step 202, determining the working status of the battery cells of the battery pack at the current moment.

[0044] Among them, the battery pack includes battery cells and temperature regulating fluid. A battery pack refers to an energy storage unit composed of one or more battery cells, which are usually connected in series or in parallel to form a larger power storage system. The battery pack plays the role of storing and releasing electrical energy in the energy storage system.

[0045] A cell is the basic building block of a battery pack, which can be a single battery cell, such as a lithium-ion battery. Cells generate heat during charging and discharging, so effective thermal management is required to ensure they operate within a safe and efficient temperature range.

[0046] Temperature regulating fluid refers to coolant, which is a medium used to conduct and regulate the heat of battery cells. It is usually a water-based or oil-based liquid. It circulates through the liquid cooling system, takes away the heat generated by the battery cells and keeps the battery cell temperature stable.

[0047] The working state mainly includes charging state, discharging state and static state. The heat generation and temperature adaptability range of the battery cell in each state are different, so different thermal management strategies are required.

[0048] Specifically, after the energy storage compartment starts running, the BMS (Battery Management System) will collect the current signal of the battery cell. The current signal is used to determine the current working state of the battery cell. Based on the current signal, the BMS divides the working state of the battery cell into three types: charging state, discharging state, and static state. Once the working state of the battery cell is determined, the thermal management system will select an appropriate control strategy based on the working state of the battery cell.

[0049] Step 204 , obtaining the temperature information of the battery cell at the current moment, and determining the target control mode corresponding to the battery cell at the current moment and the target preset temperature matching the target control mode according to the working state and the temperature information.

[0050] The temperature information refers to the real-time monitored battery cell temperature data, which may be the maximum temperature, minimum temperature and average temperature of the battery cell, or the temperature of different battery cell areas, and may be set according to actual needs.

[0051] The target control mode refers to the specific cooling strategy adopted by the thermal management system according to the current working state (charging, discharging or static) and temperature information of the battery cell. It mainly includes the cooling mode in the charging state, the heating mode in the charging state, the cooling mode in the discharging state, the heating mode in the discharging state, the cooling mode in the static state, the heating mode in the static state, and the self-circulation mode in the static state. It can be understood that the heat generation and temperature adaptation range of the battery cell are different in different working states, so different cooling methods and cooling intensities are required. The target control mode aims to ensure that the battery cell temperature is maintained within the ideal range by matching the most suitable cooling strategy, while taking into account energy consumption and efficiency.

[0052] The target preset temperature refers to the ideal temperature parameter set by the thermal management system for the battery cell under a specific target control mode. The setting of the target preset temperature is directly related to the supply temperature of the coolant, which in turn affects the temperature control effect of the battery cell and the overall energy consumption of the system.

[0053] Specifically, first, the temperature data of the battery cell is monitored in real time, including but not limited to the maximum temperature, minimum temperature, average temperature, and even the temperature of different areas. Then, according to the working status and temperature information of the battery cell, the most appropriate thermal management strategy, i.e., the target control mode, is selected. The target control mode includes: cooling or heating mode in the charging state, cooling or heating mode in the discharging state, and cooling or heating mode or self-circulation mode in the static state. Finally, according to the selected target control mode, the ideal temperature parameter pre-set for the target control mode, i.e., the target preset temperature, is obtained.

[0054] Step 206 : determining a first liquid temperature corresponding to the temperature regulating liquid at the current moment according to the temperature information and the target preset temperature.

[0055] The first liquid temperature refers to the initial temperature of the temperature regulating liquid determined at the current moment based on the temperature information of the battery cell and the target preset temperature. It is calculated based on the current temperature state of the battery cell and in order to achieve the desired battery cell temperature under the target control mode. In other words, the first liquid temperature is the temperature that the system should theoretically have for the coolant or heat exchange medium to adjust the battery cell temperature to the target preset temperature.

[0056] Specifically, based on the current temperature information of the battery cell and the target preset temperature, the coolant supply temperature is calculated by a formula. For example, this calculation process takes into account the difference between the current temperature of the battery cell and the target preset temperature to determine the most suitable coolant temperature. Alternatively, the target preset temperature, an ideal temperature parameter, exists in the form of different parameter ranges, and different parameter ranges correspond to different liquid temperatures. When the current temperature of the battery cell is within a certain parameter range of the target preset temperature, the liquid temperature corresponding to the parameter range is the first liquid temperature.

[0057] Step 208, obtaining the temperature control condition corresponding to the target control mode, and determining the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid with the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0058] Among them, temperature control conditions refer to a series of rules or restrictions that the thermal management system must comply with in a specific target control mode. These rules or restrictions guide the adjustment of the coolant temperature. Temperature control conditions may include but are not limited to: the upper and lower limits of the coolant temperature, the allowable range of the battery cell temperature, and the specific temperature requirements under the working state of the battery cell (charging, discharging or static), etc., which can be set according to actual needs.

[0059] The second liquid temperature refers to the temperature of the temperature regulating liquid actually supplied to the battery cell for heat exchange after system adjustment based on the first liquid temperature and temperature control conditions. It takes into account the constraints and system performance in actual operation, and may be the temperature of the liquid after heating or cooling to meet the temperature control requirements of the battery cell in the current working state. The second liquid temperature is closer to the actual execution temperature, and it reflects the final coolant temperature determined by the system after considering all control conditions.

[0060] Specifically, first obtain the temperature control conditions that match the current desired target control mode. These conditions are a series of rules or restrictions that guide the adjustment of the coolant temperature to ensure that the battery cell is in the optimal operating temperature range. The conditions may include boundary limits for the coolant temperature, an allowable range of fluctuations in the battery cell temperature, and specific temperature requirements set according to the working state of the battery cell (charging, discharging, or standing). It is understandable that this application does not specifically limit the temperature control conditions and can be set according to actual needs.

[0061] Then, based on the real-time monitored first liquid temperature (i.e., the current coolant temperature) and the above temperature control conditions, the second liquid temperature is calculated and determined. The second liquid temperature refers to the temperature of the temperature regulating liquid actually supplied to the battery cell for heat exchange after taking into account all control conditions. This temperature is the optimal adjustment made by the system after evaluating the actual operating constraints and its own performance, which may involve heating or cooling the liquid to meet the battery cell's temperature control requirements in the current state.

[0062] In one of the embodiments, the current value of the battery cell at the current moment is obtained, and a preset current threshold corresponding to the battery cell is obtained; when the current value is less than the preset current threshold, it is determined that the battery cell is in a static state at the current moment.

[0063] Specifically, first, the BMS continuously monitors the current signal of each battery cell or battery cell group. This step is achieved through sensors that can read the current intensity flowing through the battery cell in real time. Then the preset current threshold is a standard value set based on the characteristics of the battery cell and the design of the battery pack to distinguish different working states. For example, if the battery cell is in a static state, the current should be very low, close to zero. Next, when the BMS obtains the real-time current value of the battery cell, it compares this value with the preset current threshold. Finally, if the current current value is less than the preset current threshold, it means that the activity level of the battery cell is low and is not enough to constitute an obvious charging and discharging process. In this case, the BMS will determine that the battery cell is in a static state. The judgment of this state is based on the current signal, because the battery cell in the static state theoretically does not input or output energy, and the current should be close to zero or fluctuate within a very small range.

[0064] By accurately monitoring the working state of the battery cell, especially the static state, the BMS can avoid unnecessary charge and discharge cycles, reduce battery cell fatigue, and thus extend the overall service life of the battery. Furthermore, in the static state, the battery cell generates less heat. Therefore, the BMS can adjust the circulation rate of the temperature regulating fluid to reduce energy consumption while ensuring that the battery cell temperature is maintained within the optimal range, which saves energy and ensures battery performance.

[0065] In one of the embodiments, when the current value is not less than a preset current threshold, the current direction of the battery cell at the current moment is obtained; when the current direction is flowing from the external power supply to the battery cell, it is determined that the battery cell is in a charging state at the current moment; when the current direction is flowing from the battery cell to the external load, it is determined that the battery cell is in a discharging state at the current moment.

[0066] Specifically, first, when the BMS detects that the current value of the battery cell is not less than the preset current threshold, it means that the battery cell may be charging or discharging, rather than just being in a static state.

[0067] Then, in order to further distinguish between the charging state and the discharging state, the BMS also needs to detect the direction of the current. The current direction can be measured by a current sensor, which can determine whether the current flows from the external power supply to the battery cell (charging) or from the battery cell to the external load (discharging).

[0068] When the current direction is from the external power source to the battery cell, the BMS will determine that the battery cell is in a charging state. This means that the battery cell is receiving electrical energy from the external power source and converting it into chemical energy for storage. Conversely, when the current direction is from the battery cell to the external load, the BMS will determine that the battery cell is in a discharging state. This means that the battery cell is releasing the previously stored chemical energy and converting it into electrical energy for use by the external load.

[0069] By accurately identifying the working status of the battery cell, the system can adjust the circulation of the temperature regulating fluid in a timely manner to ensure that the battery cell operates within a safe and ideal temperature range and avoid overheating or overcooling, thereby improving the efficiency and accuracy of thermal management. During charging and discharging, the battery cell generates a lot of heat, which may cause safety hazards if it is not dissipated in time. The thermal management strategy in the solution helps prevent overheating and reduce the risk of battery failure and accidents.

[0070] In one of the embodiments, a candidate preset temperature matching the working state is determined based on the working state; a target control mode corresponding to the battery cell at the current moment is determined based on the temperature values ​​corresponding to each of the multiple battery cell sub-regions and the candidate preset temperatures, and a target preset temperature matching the target control mode is screened out from the candidate preset temperatures.

[0071] Specifically, the thermal management system continuously monitors the temperature of the battery cell, including but not limited to the maximum temperature, minimum temperature, average temperature, and even the temperature of different areas. These data provide the current thermal status of the battery cell and are the basis for subsequent decision-making.

[0072] Then once the cell's operating state (charging, discharging, or resting) is determined, the system calls a series of preset temperature options that match that state. These candidate preset temperatures are set based on the ideal temperature range of the cell under different operating states. The cell may be divided into multiple sub-regions, and the temperature of each sub-region may be different. The system analyzes the temperature values ​​of these sub-regions to more finely adjust the thermal management strategy.

[0073] Next, based on the working state of the battery cell and the temperature distribution of the sub-areas, the thermal management system selects the cooling or heating mode that best suits the current situation. For example, in the charging state, if the battery cell temperature is too high, the cooling mode may be selected; in the discharging state, if the ambient temperature is too low, the heating mode may be selected.

[0074] Finally, from the candidate preset temperatures, the temperature setting value that best matches the selected target control mode is selected, that is, the target preset temperature. This target preset temperature will guide the temperature adjustment of the coolant to ensure that the battery cell temperature remains within the optimal range.

[0075] By intelligently selecting cooling or heating mode and matching the optimal preset temperature, unnecessary coolant circulation can be reduced, energy can be saved, and operating costs can be reduced. And by ensuring that the battery cell temperature is within the optimal range, the battery's charging and discharging efficiency can be maximized, energy loss can be reduced, and the overall performance of the battery can be improved.

[0076] In one of the embodiments, a first liquid temperature corresponding to the temperature regulating liquid at the current moment is determined according to the temperature values, temperature setting values ​​and temperature control offsets corresponding to each of the plurality of battery cell sub-regions.

[0077] Specifically, the thermal management system continuously monitors multiple cell sub-areas within the battery pack, each of which may have a different temperature. These data reflect the heat distribution inside the battery. The temperature set point refers to the ideal temperature point set by the system for the cell, which is a target temperature determined based on the current working state (charging, discharging or standing) and performance requirements of the cell. The temperature control offset is used to control the difference between the set coolant temperature and the cell temperature. This difference is the heat exchange temperature difference, which is associated with the heat exchange effect. It can be understood that if the temperature control offset is not increased, taking refrigeration as an example, the monitored cell temperature is n°C higher than the cell target temperature, then the coolant set temperature is n°C lower than the cell target temperature. However, 2n°C is not necessarily a suitable heat exchange temperature difference, so an offset needs to be added to adjust the heat exchange temperature difference to an appropriate range.

[0078] For example, the target preset temperature is a plurality of temperature parameter ranges preset for the cooling mode under the charging state, as well as a temperature control offset. Each temperature parameter range corresponds to a different ideal temperature parameter, i.e., a temperature setting value. According to the temperature values ​​corresponding to each of the plurality of battery cell sub-areas, the average temperature value, the maximum temperature value, or the minimum temperature value of the battery cell is calculated. Then, the calculated average temperature value, the maximum temperature value, or the minimum temperature value is further compared with each temperature parameter range to determine which temperature parameter range the average temperature value, the maximum temperature value, or the minimum temperature value falls into. If it falls into which parameter range, the ideal temperature parameter corresponding to the parameter range, i.e., the temperature setting value and the temperature control offset are used as the basic data, and the initial temperature of the temperature regulating liquid, i.e., the first liquid temperature, is obtained by calculation at the current moment according to the temperature information of the battery cell and the target preset temperature.

[0079] By dynamically adjusting the temperature of the temperature regulating fluid, the cooling capacity is increased or decreased only when necessary, avoiding overcooling or heating, thereby reducing energy consumption and improving energy efficiency. And by maintaining the battery cell within the ideal temperature range, the battery charging and discharging efficiency can be maximized, reducing performance degradation caused by excessively high or low temperatures.

[0080] In one embodiment, when the first liquid temperature is greater than the upper limit value of the preset temperature range, the upper limit value is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is less than the lower limit value of the preset temperature range, the lower limit value is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment.

[0081] Specifically, the temperature control conditions include the upper and lower limits of the coolant temperature, the allowable range of the battery cell temperature, and the specific temperature requirements of the battery cell under different working conditions. These conditions are the rules that the system must follow when adjusting the coolant temperature.

[0082] If the first liquid temperature is greater than the upper limit of the preset temperature range, it means that the originally planned coolant temperature is too high, and it may not be able to effectively cool down or may cause the battery cell to overheat. At this time, the system will use the upper limit of the preset temperature range as the second liquid temperature, that is, the actual coolant temperature supplied to the battery cell. Similarly, if the first liquid temperature is less than the lower limit of the preset temperature range, it means that the originally planned coolant temperature is too low, and it may not be able to effectively heat or cause the battery cell to overcool. At this time, the lower limit of the preset temperature range will be used as the second liquid temperature. This ensures that the temperature control of the battery cell meets the established temperature control conditions while avoiding exceeding the limits of the preset temperature range.

[0083] Due to the setting of temperature control conditions, the thermal management system can achieve precise control of the coolant temperature while ensuring the safety and performance of the battery cells. This not only helps to maintain the battery cells in the optimal operating temperature range, but also avoids energy waste or battery cell damage caused by improper temperature regulation, thereby improving the overall efficiency and life of the battery system.

[0084] In one embodiment, when the first liquid temperature is within a preset temperature range, the first liquid temperature is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment.

[0085] Specifically, first detect whether the first liquid temperature falls within the preset temperature range. If the first liquid temperature is neither greater than the upper limit nor less than the lower limit, it is considered reasonable and safe. When the first liquid temperature is indeed within the preset temperature range, the first liquid temperature can be directly used as the second liquid temperature. This means that there is no need to additionally adjust the temperature of the coolant because it is already suitable for the temperature control requirements of the current battery cell.

[0086] Due to the setting of temperature control conditions, the thermal management system can efficiently and accurately control the temperature of the battery cell, avoid unnecessary temperature adjustment, reduce energy waste, and ensure that the battery cell operates at the optimal operating temperature, thereby improving the performance and safety of the battery. When the first liquid temperature already meets the preset temperature range, it is directly used as the second liquid temperature, which not only simplifies the control process, but also reflects the intelligent and adaptive capabilities of the thermal management system.

[0087] In one embodiment, the working state of the battery cell has three states, including charging state, discharging state and static state. The target control mode has two modes, including cooling mode and heating mode.

[0088] The candidate preset temperatures refer to the temperature setting values ​​under each battery cell working state, specifically including: Tmax: maximum battery cell temperature, Tavg: average battery cell temperature, Tmin: minimum battery cell temperature, Td: battery cell temperature difference, Tout: coolant supply temperature (i.e., the first liquid temperature), Tcout01: static state cooling temperature setting value, Thout01: static state heating temperature setting value, Tcs01: static state cooling hysteresis, Ths01: static state heating hysteresis, Tcs02: charging state cooling hysteresis, Ths02: charging state heating hysteresis, Tcs03: discharging state cooling hysteresis, Ths03: discharging state heating hysteresis, Tcset01: static state cooling temperature setting value, Thset01: static state heating temperature setting value, Tcset02: charging state cooling temperature setting value, Thset02: charging state heating temperature setting value, Tcset03: discharging state cooling temperature setting value, Thset03: discharging state cooling temperature setting value. Understandably, cooling hysteresis and heating hysteresis are control strategy parameters used in thermal control systems to prevent frequent start and stop of temperature control devices. These hysteresis refers to the difference between the temperature set point and the actual operating point when the system turns on or off the cooling or heating mode. The temperature set point refers to the target temperature that the system should maintain under specific conditions. The set point may be different under different operating conditions. When the battery cell is in different states (such as static, charging or discharging), the system will decide when to start or stop the cooling or heating mode based on the corresponding temperature set point and hysteresis value to ensure that the battery cell temperature is maintained within a safe and effective range. This strategy helps improve energy efficiency, extend battery life, and maintain the consistency and safety of the battery cell temperature.

[0089] There are four types of temperature control offsets, including m, n, k, and j. The target preset temperature refers to the temperature setting value and temperature control offset that best matches the selected target control mode from the candidate preset temperatures, that is, the target preset temperature. The temperature control conditions include four preset temperature ranges, including Tclx: cooling mode liquid supply temperature low limit, Tchx: cooling mode liquid supply temperature high limit, Thlx: heating mode liquid supply temperature low limit, and Thhx: heating mode liquid supply temperature high limit.

[0090] When the working state of the battery cell is the charging state, if Tmax≥(Tcset02+Tcs)℃ and Tavg≥Tcset02℃, the liquid cooling unit enters the cooling mode, and the first liquid temperature Tout=Tcset02- (Tavg-Tcset02)-m. If the calculated first liquid temperature is less than the lower limit of the cooling mode liquid supply temperature, that is, Tout< Tclx, the second liquid temperature is output according to the lower limit; if the calculated first liquid temperature is greater than the upper limit of the cooling mode liquid supply temperature, that is, Tout> Tchx, the second liquid temperature is output according to the upper limit; otherwise, the second liquid temperature is output according to the actual calculated value, that is, the first liquid temperature. After Tmax≤22℃ and Tavg≤20℃, the cooling mode is turned off.

[0091] If Tmin≤(Thset02-Ths)℃ and Tavg≤Thset02℃, the liquid cooling unit enters the heating mode, and the first liquid temperature Tout=Thset02+ (Thset02-Tavg)+n. If the calculated first liquid temperature is less than the lower limit of the liquid supply temperature in the cooling mode, that is, Tout< Tclx, the second liquid temperature is output according to the lower limit; if the calculated first liquid temperature is greater than the upper limit of the liquid supply temperature in the cooling mode, that is, Tout> Tchx, the second liquid temperature is output according to the upper limit; otherwise, the second liquid temperature is output according to the actual calculated value, that is, the first liquid temperature. Until Tmin≥15℃, turn off the heating mode. If the temperature is not within the above judgment range, the liquid cooling unit is on standby.

[0092] When the working state of the battery cell is the discharge state, if Tmax≥(Tcset03+Tcs)℃ and Tavg≥Tcset03℃, the liquid cooling unit enters the cooling mode, and the first liquid temperature Tout=Tcset03- (Tavg-Tcset03)-j. If the calculated first liquid temperature is less than the lower limit of the cooling mode liquid supply temperature, that is, Tout< Tclx, the second liquid temperature is output according to the lower limit; if the calculated first liquid temperature is greater than the upper limit of the cooling mode liquid supply temperature, that is, Tout> Tchx, the second liquid temperature is output according to the upper limit; otherwise, the second liquid temperature is output according to the actual calculated value, that is, the first liquid temperature. After Tmax≤22℃ and Tavg≤20℃, the cooling mode is turned off.

[0093] If Tmin≤(Thset03-Ths)℃ and Tavg≤Thset03℃, the liquid cooling unit enters the heating mode, and the first liquid temperature Tout=Thset03+ (Thset03-Tavg)+k. If the calculated first liquid temperature is less than the lower limit of the liquid supply temperature in the cooling mode, that is, Tout< Tclx, the second liquid temperature is output according to the lower limit; if the calculated first liquid temperature is greater than the upper limit of the liquid supply temperature in the cooling mode, that is, Tout> Tchx, the second liquid temperature is output according to the upper limit; otherwise, the second liquid temperature is output according to the actual calculated value, that is, the first liquid temperature. Until Tmin≥15℃, turn off the heating mode. If the temperature is not within the above judgment range, the liquid cooling unit is on standby.

[0094] When the working state of the battery cell is static, if Tmax≥Tcset01℃ and Tavg≥Tcs01℃, the cold machine starts the cooling mode, and the first liquid temperature Tout=Tcout01℃. Until Tmax≤28℃ and Tavg≤26℃, turn off the cooling mode. If Tmin≤Thset01-Ths01℃ and Tavg≤Thset01℃, the cold machine starts the heating mode, and the first liquid temperature Tout=Thout01. Until Tmin≥15℃, turn off the heating mode. If Td≥6℃, the cold machine starts the self-circulation mode to actively average the temperature until Td≤3℃, and stops the self-circulation mode. It can be understood that the stop parameters and control parameters can be set according to actual needs.

[0095] Since the present application adopts different thermal management strategies for the three different working states of the battery cell. Compared with the charging state, the battery cell has a wider temperature range in the discharge state. The thermal management strategy in the discharge state can appropriately relax the temperature control limit. For example, the delayed triggering of the refrigeration mode can reduce the heat dissipation load of the liquid cooling unit without affecting the temperature safety of the battery cell and reducing the energy consumption of the liquid cooling unit. And when the battery cell is charging and discharging, as the temperature of the battery cell gradually increases, the liquid supply temperature of the liquid cooling unit is gradually reduced to enhance the heat exchange. When the required cooling capacity is small, a higher liquid supply temperature is implemented, and the energy consumption of the liquid cooling unit is reduced by temperature matching. And when the battery cell is in a static state, if the temperature difference of the battery cell is detected to be high, self-circulation temperature equalization will be triggered, and the liquid cooling unit will enter the self-circulation mode to actively equalize the temperature of the battery cell. Active temperature equalization can further reduce the capacity difference caused by long-term operation of the battery cell.

[0096] In an exemplary embodiment, Figure 3 As shown, it includes steps 302 to 308. Among them:

[0097] Step 302, obtaining the current value of the battery cell at the current moment, and obtaining the preset current threshold value corresponding to the battery cell; when the current value is less than the preset current threshold value, determining that the battery cell is in a static state at the current moment; when the current value is not less than the preset current threshold value, obtaining the current direction of the battery cell at the current moment; when the current direction is flowing from the external power supply to the battery cell, determining that the battery cell is in a charging state at the current moment; when the current direction is flowing from the battery cell to the external load, determining that the battery cell is in a discharging state at the current moment;

[0098] Step 304, determining a candidate preset temperature matching the working state according to the working state; determining a target control mode corresponding to the battery cell at the current moment according to the temperature values ​​corresponding to each of the plurality of battery cell sub-regions and the candidate preset temperatures, and selecting a target preset temperature matching the target control mode from the candidate preset temperatures;

[0099] Step 306, determining a first liquid temperature corresponding to the temperature regulating liquid at the current moment according to the temperature values, temperature setting values ​​and temperature control offsets corresponding to the plurality of battery cell sub-regions;

[0100] Step 308, when the first liquid temperature is greater than the upper limit value of the preset temperature range, the upper limit value is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is less than the lower limit value of the preset temperature range, the lower limit value is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is within the preset temperature range, the first liquid temperature is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment.

[0101] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0102] Based on the same inventive concept, the embodiment of the present application also provides a battery pack temperature control device for implementing the battery pack temperature control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the temperature control device for one or more battery packs provided below can refer to the limitations of the battery pack temperature control method above, and will not be repeated here.

[0103] In an exemplary embodiment, Figure 4 As shown, a temperature control device 400 for a battery pack is provided, comprising: a first determination module 402, an acquisition module 404, a second determination module 406 and an adjustment module 408, wherein:

[0104] A first determination module 402 is used to determine the working state of the battery cell of the battery pack at the current moment;

[0105] The acquisition module 404 is used to acquire the temperature information of the battery cell at the current moment, and determine the target control mode corresponding to the battery cell at the current moment and the target preset temperature matching the target control mode according to the working state and the temperature information;

[0106] A second determination module 406 is used to determine a first liquid temperature corresponding to the temperature regulating liquid at a current moment according to the temperature information and the target preset temperature;

[0107] The regulating module 408 is used to obtain the temperature control condition corresponding to the target control mode, and determine the second liquid temperature corresponding to the temperature regulating liquid at the current moment based on the first liquid temperature and the temperature control condition; the temperature regulating liquid with the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

[0108] In one embodiment, the first determination module 402 is used to obtain the current value of the battery cell at the current moment and obtain the preset current threshold corresponding to the battery cell; when the current value is less than the preset current threshold, it is determined that the battery cell is in a static state at the current moment.

[0109] In one embodiment, the first determination module 402 is used to obtain the current direction of the battery cell at the current moment when the current value is not less than a preset current threshold; when the current direction is flowing from the external power supply to the battery cell, determine that the battery cell is in a charging state at the current moment; when the current direction is flowing from the battery cell to the external load, determine that the battery cell is in a discharging state at the current moment.

[0110] In one embodiment, the acquisition module 404 is used to determine a candidate preset temperature that matches the working state according to the working state; determine the target control mode corresponding to the battery cell at the current moment according to the temperature values ​​corresponding to each of the multiple battery cell sub-areas and the candidate preset temperatures, and filter out the target preset temperature that matches the target control mode from the candidate preset temperatures.

[0111] In one embodiment, the second determination module 406 is used to determine the first liquid temperature corresponding to the temperature regulating liquid at the current moment according to the temperature values, temperature setting values ​​and temperature control offsets corresponding to the plurality of battery cell sub-regions.

[0112] In one embodiment, the adjustment module 408 is used to use the upper limit value as the second liquid temperature corresponding to the temperature regulating liquid at the current moment when the first liquid temperature is greater than the upper limit value of the preset temperature range; and use the lower limit value as the second liquid temperature corresponding to the temperature regulating liquid at the current moment when the first liquid temperature is less than the lower limit value of the preset temperature range.

[0113] In one embodiment, the regulating module 408 is configured to use the first liquid temperature as the second liquid temperature corresponding to the temperature regulating liquid at the current moment when the first liquid temperature is within a preset temperature range.

[0114] Each module in the temperature control device of the battery pack can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0115] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 5 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store temperature control data related to the battery pack. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a temperature control method for a battery pack is implemented.

[0116] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0117] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0118] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0119] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0120] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0121] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0122] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0123] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A temperature control method for a battery pack, characterized in that: The battery pack includes a battery cell and a temperature regulating liquid, and the method includes: Determine the working status of the battery cells of the battery pack at the current moment; Acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment, and a temperature setting value and a temperature control offset pre-set for the target control mode according to the working state and the temperature information; Determining a first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information, the temperature setting value and the temperature control offset; Obtain a temperature range of the temperature regulating liquid pre-set for the target control mode; when the first liquid temperature is greater than an upper limit value of the temperature regulating liquid temperature range, use the upper limit value as a second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is less than a lower limit value of the temperature regulating liquid temperature range, use the lower limit value as a second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is within the temperature range of the temperature regulating liquid, use the first liquid temperature as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

2. The method according to claim 1, characterized in that The working state includes a static state; and determining the working state of the battery cell of the battery pack at the current moment includes: Obtaining the current value of the battery cell at the current moment, and obtaining the preset current threshold value corresponding to the battery cell; When the current value is less than the preset current threshold, it is determined that the battery cell is in a stationary state at the current moment.

3. The method according to claim 2, characterized in that The working state also includes a charging state and a discharging state; and determining the working state of the battery cell of the battery pack at the current moment includes: When the current value is not less than the preset current threshold, obtaining the current direction of the battery cell at the current moment; When the current direction is from the external power source to the battery cell, determining that the battery cell is in a charging state at the current moment; When the current direction is flowing from the battery cell to the external load, it is determined that the battery cell is in a discharging state at the current moment.

4. The method according to claim 1, characterized in that The battery cell includes a plurality of battery cell sub-regions, and the temperature information of the battery cell at the current moment includes temperature values ​​corresponding to the plurality of battery cell sub-regions respectively; The step of determining, according to the working state and the temperature information, a target control mode corresponding to the battery cell at the current moment and a target preset temperature matching the target control mode comprises: According to the working state, determining a candidate preset temperature matching the working state; According to the temperature values ​​corresponding to the multiple battery cell sub-areas and the candidate preset temperatures, the target control mode corresponding to the battery cell at the current moment is determined, and the target preset temperature matching the target control mode is screened out from the candidate preset temperatures.

5. The method according to claim 4, characterized in that The target preset temperature includes a temperature setting value corresponding to the target control mode in the working state and a temperature control offset; Determining the first liquid temperature of the temperature regulating liquid corresponding to the current moment according to the temperature information, the temperature setting value and the temperature control offset includes: A first liquid temperature of the temperature regulating liquid corresponding to the current moment is determined according to the temperature values ​​corresponding to each of the plurality of battery cell sub-regions, the temperature setting value, and the temperature control offset.

6. A temperature control device for a battery pack, characterized in that: The device comprises: A first determination module, used to determine the working state of the battery cell of the battery pack at a current moment; an acquisition module, used to acquire temperature information of the battery cell at a current moment, and determine a target control mode corresponding to the battery cell at the current moment, and a temperature setting value and a temperature control offset pre-set for the target control mode according to the working state and the temperature information; A second determination module, configured to determine a first liquid temperature corresponding to the temperature regulating liquid at the current moment according to the temperature information, the temperature setting value and the temperature control offset; A regulating module is used to obtain a temperature regulating liquid temperature range pre-set for the target control mode; when the first liquid temperature is greater than an upper limit value of the temperature regulating liquid temperature range, the upper limit value is used as a second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is less than a lower limit value of the temperature regulating liquid temperature range, the lower limit value is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; when the first liquid temperature is within the temperature regulating liquid temperature range, the first liquid temperature is used as the second liquid temperature corresponding to the temperature regulating liquid at the current moment; the temperature regulating liquid at the second liquid temperature is used to regulate the temperature of the battery cell at the current moment.

7. The device according to claim 6, characterized in that The first determination module is used to obtain the current value of the battery cell at the current moment and obtain the preset current threshold corresponding to the battery cell; when the current value is less than the preset current threshold, it is determined that the battery cell is in a static state at the current moment.

8. The device according to claim 7, characterized in that The first determination module is used to obtain the current direction of the battery cell at the current moment when the current value is not less than the preset current threshold; when the current direction is flowing from the external power supply to the battery cell, determine that the battery cell is in a charging state at the current moment; when the current direction is flowing from the battery cell to the external load, determine that the battery cell is in a discharging state at the current moment.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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