Battery temperature control method, apparatus and system, and device and storage medium

Abstract

The present application relates to the field of batteries. Provided are a battery temperature control method, apparatus and system, and a device and a storage medium. The method comprises: acquiring a first temperature of a first battery in an electric device and a second temperature of a second battery therein; determining a first temperature difference according to the first temperature and the second temperature; and when the first temperature difference is greater than a predetermined first temperature difference threshold value, performing cooling treatment on the first battery, wherein the first temperature is higher than the second temperature. When a first temperature difference is higher than a first temperature difference threshold value, a first battery corresponding to a first temperature is cooled, such that the temperatures of batteries are more similar, thereby improving the overall performance of the batteries, and improving the usage experience of the batteries.

Description

Battery temperature control method, device, system, equipment and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 30, 2023, with application number 202310798566.2 and invention name “Battery temperature control method, device, system, equipment and storage medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of batteries, and in particular to a method, device, system, equipment, and storage medium for controlling battery temperature. Background Art

[0003] With the development of battery energy storage technology, the energy density of batteries has been significantly improved. However, this also brings potential problems. For example, during use, the battery temperature may rise to a high level due to environmental factors or operating power, which is not conducive to safe and stable operation of the battery.

[0004] To reduce the damage to the battery caused by overheating, temperature thresholds T0 and T1 can be pre-set. When the battery temperature reaches temperature threshold T0, cooling is turned on. During the cooling process, if the temperature drops to temperature threshold T1, cooling is turned off. This method can effectively reduce the chance of the battery overheating. However, when the battery is used in application scenarios such as heavy trucks and construction machinery, the same electrical equipment may include multiple batteries, and there may be temperature differences between different batteries, which is not conducive to improving battery performance and affects the battery user experience.

[0005] Summary of the Invention

[0006] In view of this, the embodiments of the present application provide a battery temperature control method, device, system, equipment and storage medium to solve the problem in the prior art that the same electrical equipment may include multiple batteries, and there may be temperature differences between different batteries, which is not conducive to improving battery performance and affects the battery usage experience.

[0007] A first aspect of an embodiment of the present application provides a battery temperature control method, the method comprising: obtaining a first temperature of a first battery and a second temperature of a second battery in an electrical device; determining a first temperature difference based on the first temperature and the second temperature; and cooling the first battery when the first temperature difference is greater than a predetermined first temperature difference threshold, wherein the first temperature is higher than the second temperature.

[0008] Among them, the batteries in the electrical device may include at least two. The first battery and the second battery are any two of the two or more batteries, that is, any two of the batteries can be selected as the first battery and the second battery in combination for temperature difference comparison and cooling processing. When determining the first temperature difference, if the first temperature is greater than the second temperature, the second temperature can be subtracted from the first temperature to obtain a positive first temperature difference. When the first temperature difference is greater than the first temperature difference threshold, the first battery corresponding to the first temperature is cooled, so that the temperatures between the batteries are closer, thereby improving the overall performance of the battery and improving the battery usage experience.

[0009] In combination with the first aspect, in a first possible implementation of the first aspect, the first temperature includes an average of temperatures at two or more measuring points in the first battery, and the second temperature includes an average of temperatures at two or more measuring points in the second battery.

[0010] In a possible implementation, two or more temperature sensors are installed within the battery to collect two or more temperatures. The two or more temperature sensors can be evenly distributed within the battery. Determining a first temperature of the first battery and a second temperature of the second battery based on the average of the collected temperatures at the two or more measurement points can improve the accuracy of the battery temperatures. Installing two or more temperature sensors within the first or second battery can provide more accurate battery temperatures.

[0011] In combination with the first aspect, in a second possible implementation of the first aspect, the first temperature is the average temperature of two or more battery cells in the first battery, or the specified battery cell temperature in the first battery; the second temperature is the average temperature of two or more battery cells in the second battery, or the specified battery cell temperature in the second battery.

[0012] In which, two or more battery cells are respectively provided in the first battery and the second battery. A temperature sensor can be provided at each battery cell to collect the temperature of each battery cell. An average value is calculated based on the collected temperature of each battery cell to obtain the first temperature of the first battery and the second temperature of the second battery. Not limited to this, the temperatures of some battery cells in the battery can also be collected, such as collecting the temperature of the battery cells at intervals of a predetermined number of battery cells, or collecting the temperature of the battery cells in the battery at intervals of a predetermined distance. The first temperature and the second temperature are determined by calculating the average value of multiple temperatures collected in the same battery, so that the determined battery temperatures are more accurate. Alternatively, the temperature of a specified battery cell in the first battery can be used as the first temperature, and the temperature of a second battery cell in the second battery can be used as the second temperature.

[0013] In combination with any one of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, obtaining a first temperature of a first battery and a second temperature of a second battery in an electrical device includes: obtaining the temperatures of multiple batteries in the electrical device; determining the highest temperature and the lowest temperature of the multiple batteries, wherein the highest temperature is the first temperature of the first battery, and the lowest temperature is the second temperature of the second battery.

[0014] When a vehicle is equipped with more than two batteries, to avoid the drawbacks of multiple first temperature differences between the multiple batteries, which might require multiple cooling processes for the same battery, resulting in cumbersome operation and low cooling efficiency, the temperature of each battery can be obtained separately to determine the highest and lowest temperatures among all the batteries. The highest temperature is used as the first temperature, and the lowest temperature is used as the second temperature. A first temperature difference is determined based on the determined first and second temperatures, and cooling is performed based on the determined first temperature difference. This allows timely cooling of the battery with the highest temperature, improving cooling efficiency.

[0015] In combination with any one of the first aspects to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, obtaining the first temperature of a first battery and the second temperature of a second battery in an electrical device includes: obtaining the temperatures of multiple batteries in the electrical device; determining the lowest temperature of the multiple batteries as the second temperature, and the battery corresponding to the second temperature as the second battery; and treating other batteries other than the second battery as first batteries to determine the first temperature of the first battery.

[0016] To further improve the cooling efficiency of batteries and enhance battery performance, the lowest temperature among multiple battery temperatures can be determined and used as the second temperature. The temperatures of the remaining batteries are compared with the second temperature, and the temperatures of one or more batteries are determined as the first temperature based on the first temperature difference threshold, and the one or more batteries are cooled. Comparing the battery temperature with the lowest temperature to determine the battery that needs cooling can improve the cooling efficiency of the battery, quickly reduce the temperature difference between multiple batteries, and improve the performance of the battery during use.

[0017] In combination with any one of the first aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes: performing the cooling process on the first battery when a highest temperature of the plurality of battery cells in the first battery is greater than a predetermined first temperature threshold. Alternatively, performing the cooling process on the first battery when the first temperature of the first battery is greater than a predetermined second temperature threshold.

[0018] The battery includes multiple temperature sensors, and multiple measuring point temperatures at different locations can be used. Or, when the temperatures corresponding to multiple battery cells are collected, the highest temperature among the multiple battery cell temperatures in the same battery can be determined. When the highest temperature of the battery is determined, the highest temperature of the battery can be used as a condition to trigger battery cooling. That is, when any of the following conditions are met: the first temperature difference is greater than the first temperature difference threshold, or the highest temperature among two or more temperatures in the first battery is greater than the predetermined first temperature threshold, or the first temperature of the first battery is greater than the predetermined second temperature threshold, cooling of the first battery can be triggered. By triggering cooling processing by the highest temperature among the temperatures at different detection locations of the first battery, cooling can be triggered in a timely manner when the local temperature of the first battery rises, which is conducive to improving the timeliness of cooling.

[0019] In combination with the fifth possible implementation of the first aspect, in a sixth possible implementation of the first aspect, when the highest temperature of two or more temperatures in the first battery is less than or equal to a predetermined third temperature threshold, cooling the first battery is stopped; or when the temperature of the first battery is less than or equal to a predetermined fourth temperature threshold, cooling the first battery is stopped, where the third temperature threshold is less than the first temperature threshold, the fourth temperature threshold is less than the second temperature threshold, and the third temperature threshold is less than the first temperature threshold.

[0020] When it is determined that the temperature of the first battery is high and the first battery needs to be cooled, in order to reduce the frequency of cooling operations on the first battery, a third temperature threshold can be set so that the highest temperature of multiple battery cells in the first battery is less than or equal to the third temperature threshold, thereby allowing the temperature of the first battery to drop to a lower temperature range, and increasing the time it takes for the first temperature of the first battery to quickly rise to exceed the first temperature threshold, thereby increasing the time it takes for the battery to be maintained at a low temperature and improving battery performance.

[0021] In combination with any one of the first aspects to the sixth possible implementation manner of the first aspect, in the seventh possible implementation manner of the first aspect, the first battery is cooled, including: when the highest temperature among the multiple battery cell temperatures in the first battery is greater than a predetermined first temperature threshold, the first temperature difference is compared with a predetermined second temperature difference threshold; or when the temperature of the first battery is greater than the predetermined second temperature threshold, the first temperature difference is compared with a predetermined second temperature difference threshold, wherein the second temperature difference threshold is less than the first temperature difference threshold; when the first temperature difference is less than the predetermined second temperature difference threshold, the first battery and the second battery are cooled.

[0022] To further improve the cooling efficiency of the battery, when it is determined that the highest temperature among multiple temperatures in the first battery is greater than a predetermined first temperature threshold, the first temperature difference and the second temperature difference threshold can be compared, where the second temperature difference threshold is less than the first temperature difference threshold. If the first temperature difference is less than the second temperature difference threshold, it indicates that the temperatures of the first battery and the second battery are relatively close. By cooling the first battery and the second battery, the need to cool the second battery after cooling the first battery can be reduced due to the temperature difference between the first and second batteries after cooling being greater than the first temperature difference threshold. This is beneficial to improving the cooling efficiency of the battery and improving battery performance.

[0023] In combination with the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, when the first temperature difference is less than a predetermined second temperature difference threshold, cooling the first battery and the second battery includes: when the second temperature of the second battery drops to less than or equal to a predetermined second temperature threshold, stopping cooling the first battery and the second battery.

[0024] Under normal circumstances, during the cooling process, the temperature of the second battery is lower than that of the first battery. When the temperature of the second battery drops below a second temperature threshold, cooling of the first and second batteries is stopped. The second temperature threshold is lower than the first temperature threshold. Because the second temperature difference between the first and second temperatures is small, after simultaneous cooling, both the first and second batteries drop to lower temperatures.

[0025] In combination with the first aspect to the second possible implementation of the first aspect, and any one of the fifth possible implementation of the first aspect to the eighth possible implementation of the first aspect, in the ninth possible implementation of the first aspect, the first battery is cooled by a first unit, the second battery is cooled by a second unit, and the first unit and the second unit communicate with a battery management system.

[0026] To cool the first and second batteries, separate cooling units can be configured for each battery in a vehicle or other electrical equipment. For example, the first battery can be cooled using the first cooling unit, while the second battery can be cooled using the second cooling unit. The first and second cooling units communicate with the battery management system, which sends cooling commands to control cooling of each unit. By configuring multiple cooling units for cooling control, it can effectively meet the high-power cooling needs of high-power engineering equipment, including heavy-duty trucks.

[0027] In combination with the first aspect to the second possible implementation manner of the first aspect, and any one of the fifth possible implementation manner of the first aspect to the eighth possible implementation manner of the first aspect, in the tenth possible implementation manner of the first aspect, the unit is connected to multiple cooling channels through controllable valves, the cooling channels include a first cooling channel and a second cooling channel, and the controllable valves include a first controllable valve and a second controllable valve; the first battery is cooled through the first cooling channel, and the second battery is cooled through the second cooling channel, the unit communicates with the battery control system, and the first controllable valve and the second controllable valve communicate with the battery management system.

[0028] By delivering the unit's refrigerant to different batteries through multiple pipes, and controlling the opening and closing of each pipe using controllable valves installed on the pipes, the cooling process of each battery can be controlled. This effectively meets the cooling needs of lower-power equipment. Furthermore, multiple pipes outputting refrigerant from the same unit can better ensure consistent cooling efficiency, which helps improve the consistency of battery temperature during cooling and further enhance battery performance.

[0029] A second aspect of an embodiment of the present application provides a battery temperature control device, the device comprising: a temperature acquisition unit, for acquiring a first temperature of a first battery and a second temperature of a second battery in an electrical device; a temperature difference determination unit, for determining a first temperature difference based on the first temperature and the second temperature; and a cooling processing unit, for performing cooling processing on the first battery when the first temperature difference is greater than a predetermined first temperature difference threshold, wherein the first temperature is higher than the second temperature.

[0030] A third aspect of an embodiment of the present application provides a battery temperature control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in any one of the first aspects when executing the computer program.

[0031] A fourth aspect of an embodiment of the present application provides a vehicle comprising two or more batteries, wherein the batteries of the vehicle are cooled by the battery temperature control method according to any one of the first aspects.

[0032] A fifth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in any one of the first aspects are implemented.

[0033] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] FIG1 is a schematic diagram of an implementation scenario of a battery temperature control method provided in an embodiment of the present application;

[0036] FIG2 is a schematic diagram of an implementation scenario of another battery temperature control method provided in an embodiment of the present application;

[0037] FIG3 is a schematic diagram of a flow chart of a method for controlling battery temperature according to an embodiment of the present application;

[0038] FIG4 is a temperature diagram of a battery provided in an embodiment of the present application;

[0039] FIG5 is a schematic diagram of an implementation flow of determining a first battery and a second battery according to an embodiment of the present application;

[0040] FIG6 is a schematic diagram of a battery cooling process according to an embodiment of the present application;

[0041] FIG7 is a schematic diagram of a temperature control device for a battery provided in an embodiment of the present application;

[0042] FIG8 is a schematic diagram of a temperature control system of a battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0044] In order to illustrate the technical solution described in this application, specific embodiments are provided below.

[0045] When batteries are used in heavy trucks or other construction machinery, the equipment requires high power, and more than two batteries may be needed to provide energy. Differences in the installation environments of these batteries, such as ventilation conditions and heating environments, can lead to temperature differences between the batteries. This temperature difference can lead to differences in the internal resistance of the batteries, affecting their overall performance.

[0046] Based on this, an embodiment of the present application proposes a battery temperature control method, which obtains the temperature of each battery, determines the temperature difference of the battery, and cools the battery according to the size of the temperature difference, thereby reducing the temperature difference between each battery and improving battery performance.

[0047] FIG1 is a schematic diagram of an application scenario for a battery temperature control method provided in an embodiment of the present application. As shown in FIG1 , the application scenario includes a battery management system, multiple units, and a battery cell corresponding to the number of units. The battery management system can communicate with each unit individually. For example, the battery management system can communicate with each unit via a CAN bus. The battery management system can send control instructions to each unit to cool the batteries affected by that unit individually. The units include a master unit and slave units. The master unit and one or more slave units communicate with the battery management system. The battery management system can issue control instructions to control the cooling operations of each unit individually, including the master unit and the slave units. When the battery temperature control method in an embodiment of the present application detects that a battery requires cooling, the unit (master unit or slave unit) used to cool the battery can be controlled to enter a cooling operating state individually to achieve cooling of the battery. When the cooling completion condition is met, the battery management system can control the corresponding unit to stop cooling. In other words, the battery management system can control the operating states of different units in a time-sharing manner based on the cooling instructions determined by the battery.

[0048] FIG2 is a schematic diagram of an application scenario of another battery temperature control method provided in an embodiment of the present application. As shown in FIG2 , the application scenario includes a battery management system, a unit, and two or more batteries. The refrigerant output from the unit can be delivered to the battery through multiple pipes to cool the battery. A controllable valve is provided at each pipe, and the battery management system can control the opening and closing of the controllable valve to achieve temperature control of different batteries.

[0049] It is understandable that the cooling system is not limited to one unit cooling one battery, or one unit cooling all batteries through pipes. It can also include one unit cooling other numbers of batteries through pipes. For example, one unit can be used to control the temperature of two batteries, or one unit can be used to control the temperature of three batteries. When the temperature variation characteristics of the batteries are relatively similar (for example, by statistically analyzing temperature data, it can be determined that the temperature difference between the two batteries is less than a predetermined temperature value, such as less than 2 degrees), when one unit is used to control the temperature of two batteries with relatively similar temperature variation characteristics, it is not necessary to install a controllable valve on the pipe. The temperature control of the batteries can be achieved directly by controlling the operating status of the unit. When the temperature variation characteristics of the batteries differ greatly, when using multiple pipes of the same unit to cool them, controllable valves can be installed on the pipes to control them separately.

[0050] FIG3 is a schematic diagram of a flow chart of a battery temperature control method according to an embodiment of the present application, which is described in detail as follows:

[0051] In S301 , a first temperature of a first battery and a second temperature of a second battery in an electric device are acquired.

[0052] The first and second batteries in the embodiments of the present application can be any two batteries in an electrical device. For example, all batteries in an electrical device can be combined to form a combination of any two batteries. Based on the temperatures of the two batteries in the combination, the battery with the higher temperature is determined to be the first battery, and the battery with the lower temperature is determined to be the second battery. Electrical devices can include heavy trucks, construction machinery, and the like.

[0053] The battery may contain one or more battery cells, battery packs, or battery boxes. One or more temperature sensors may be provided in the battery to detect the temperature within the battery. When the battery includes multiple temperature sensors, the temperature sensors may be provided in the battery at predetermined intervals, or at intervals corresponding to a predetermined number of battery cells, or a temperature sensor may be provided at each battery cell. In a possible implementation, the temperature differences at various locations of the battery may be counted, and temperature sensors may be provided at locations where the temperature differences are large to detect the maximum and minimum temperatures of the battery.

[0054] When multiple temperature sensors are installed within a battery, the average of the temperatures detected by these sensors can be calculated as the battery temperature. Specifically, the average temperature of the first battery cell is the first temperature, and the average temperature of the second battery cell is the second temperature. The multiple temperatures used to calculate the average temperature can be the temperatures of individual battery cells or the temperatures at different measurement points. The different measurement points can be measured by temperature sensors at different distances or at intervals corresponding to the number of battery modules. Alternatively, the battery temperature can be the temperature of a specific battery cell within the battery. For example, the temperature of the cell at the center of the battery can be specified.

[0055] Figure 4 shows a schematic diagram of battery temperature after processing temperature data. Based on the multiple temperatures collected, the maximum and minimum battery temperatures are determined, as well as the average temperature calculated from the collected battery temperatures. For example, Figure 4 includes Q (Q is a positive integer greater than 2) batteries, and the maximum, minimum, and average temperatures of each battery are recorded. The average temperature of these batteries can be used as the battery temperature.

[0056] To ensure timely battery cooling and improve battery performance, when determining the first battery and the second battery, the temperatures of multiple batteries included in the electrical device can be compared to determine the highest and lowest temperatures among the multiple batteries. The highest temperature among the multiple temperatures is set as the first temperature, and the lowest temperature among the multiple temperatures is set as the second temperature. The battery corresponding to the highest temperature is the first battery, and the battery corresponding to the lowest temperature is the second battery. Based on the first and second batteries determined by the highest and lowest temperatures, the maximum temperature difference between the multiple batteries can be quickly determined, and cooling processing can be performed based on the maximum temperature difference, thereby effectively suppressing the increase in temperature difference to ensure the overall performance of the battery.

[0057] In order to improve the cooling efficiency, when determining the first battery and the second battery, as shown in FIG5 , the following steps may be included:

[0058] In S501 , the temperatures of multiple batteries in an electric device are obtained.

[0059] The electrical equipment may include large-scale mechanical engineering equipment, or may also include large vehicles and other equipment. Large vehicles include heavy trucks, etc. The electrical equipment in the embodiment of the present application may be an electrical equipment equipped with two or more batteries.

[0060] The battery temperature can be obtained using one or more temperature sensors installed in the battery. The battery temperature may also vary due to differences in the battery's installation location and surrounding environment, including ventilation conditions and the presence of heating devices.

[0061] In S502 , it is determined that the lowest temperature of the plurality of batteries is the second temperature, and the battery corresponding to the second temperature is the second battery.

[0062] After obtaining the temperatures of multiple batteries, the obtained battery temperatures can be compared to determine the lowest temperature among the multiple batteries. The lowest temperature among the multiple batteries is used as the second temperature, and the battery corresponding to the lowest temperature is used as the second battery. For the same battery, the lower the temperature, the lower the internal resistance of the battery. Therefore, the battery with the lowest temperature has a lower internal resistance than other batteries with higher temperatures. When other battery parameters are the same, the greater the difference between the temperature of other batteries and the lowest temperature, the greater the internal resistance, resulting in a decrease in overall battery performance.

[0063] In S503 , batteries other than the second battery are respectively regarded as first batteries, and first temperatures of the first batteries are determined.

[0064] Since the second battery is the battery with the lowest temperature, the batteries other than the second battery in the electrical device are used as first batteries. The first temperature is determined based on the first battery, and the first temperature is greater than the second temperature.

[0065] When the same electrical device includes multiple batteries, there may be more than two batteries other than the second battery, so more than two first batteries can be determined. If the number of batteries in the electrical device is Q, then Q-1 first batteries can be determined.

[0066] In S302 , a first temperature difference is determined according to the first temperature and the second temperature.

[0067] When the first temperature and the second temperature are the temperatures of any two batteries in the electrical device, multiple first temperature differences can be obtained according to the number of combinations. For example, the electrical device includes Q batteries, and the number of combinations obtained according to the Q batteries is That is, the quantity obtained is A combination of a first temperature and a second temperature. The first temperature difference.

[0068] When the first temperature and the second temperature are respectively the maximum temperature and the minimum temperature of the battery, it is only necessary to determine a set of the first temperature and the second temperature in real time, and determine a single first temperature difference based on the set of the first temperature and the second temperature.

[0069] When the second temperature corresponds to the lowest temperature of the batteries in the electrical device, in a device including Q batteries, the first battery may be the other Q-1 batteries in the battery except the second battery. The first battery and the second battery may include Q-1 combinations corresponding to Q-1 temperature differences.

[0070] In S303 , when the first temperature difference is greater than a predetermined first temperature difference threshold, a temperature reduction process is performed on the first battery.

[0071] Wherein, the first temperature is higher than the second temperature. If the first temperature difference is greater than a predetermined first temperature difference threshold, it indicates that the internal resistance of the first battery and the second battery is significantly different. To reduce the impact of the temperature difference on battery performance, the first battery with the higher temperature is cooled.

[0072] In a possible implementation, when any of the first temperature difference, the temperature of the first battery, or the maximum temperature satisfies a cooling condition, the unit corresponding to the first battery may be triggered to operate to cool the first battery. The first temperature difference satisfies the condition when the first temperature difference is greater than a predetermined first temperature difference threshold. The first battery temperature satisfies the condition when the temperature of the first battery is greater than a predetermined second temperature threshold. The first battery maximum temperature satisfies the condition when the maximum of two or more temperatures in the first battery is greater than a predetermined first temperature threshold.

[0073] By comparing a first temperature (which can be the average temperature of the first battery or a specified cell temperature of the first battery) with a second temperature threshold, the first battery can be cooled when the temperature of the first battery rises to a high temperature range. Alternatively, when the maximum temperature of the first battery rises to a high temperature range, such as when it exceeds a preset first temperature threshold, the first battery can be cooled. That is, by detecting and judging the high temperature range, when the temperatures of all batteries in the electrical device rise, including both the first and second temperatures, and the temperature difference is not large, cooling of the high-temperature batteries can be effectively triggered, thereby more effectively improving battery performance.

[0074] When cooling the first battery, a third temperature threshold and a fourth temperature threshold can be set. The temperature of the first battery can be compared with the fourth temperature threshold, and the highest temperature of the first battery can be compared with the third temperature threshold. When the temperature of the first battery drops to less than or equal to the fourth temperature threshold, or when the highest temperature among multiple temperatures of the first battery drops to less than or equal to the third temperature threshold, cooling the first battery is stopped. This reduces the frequency of cooling the first battery, allowing the first battery to remain in a lower temperature range for a longer period of time, thereby improving battery performance.

[0075] In a possible implementation, the first and second temperature thresholds may be set to any value between 29 and 32 degrees Celsius, and the magnitude of the first and second temperature thresholds is not necessarily limited. For example, the second temperature threshold may be 30 degrees Celsius. The first temperature difference threshold may be any value between 2 and 4 degrees Celsius, such as 3 degrees Celsius. The third and fourth temperature thresholds may be any value between 23 and 26 degrees Celsius, and the magnitude of the third and fourth temperature thresholds is not necessarily limited. For example, the fourth temperature threshold may be 24 degrees Celsius. When the monitored temperature of the first battery is 30 degrees Celsius, or when the highest temperature of the first battery is 30 degrees Celsius, a cooling operation for the first battery may be triggered. Alternatively, when the first temperature of the first battery is 29 degrees Celsius and the second temperature of the second battery is 25 degrees Celsius, because the first temperature difference between the second and first temperatures is 4 degrees Celsius, which is greater than the first temperature difference threshold, a cooling operation for the first battery may be triggered. The first battery is cooled to 24 degrees Celsius.

[0076] In an embodiment of the present application, when the temperature difference between the first temperature and the second temperature is large, cooling the first battery by triggering the first temperature difference can effectively bring the temperature of the first battery closer to that of the second battery, thereby improving battery performance. When the cooling operation is triggered by the first battery's maximum temperature or the first battery's temperature being greater than a first temperature threshold, the temperature of the first battery, which is at a higher temperature, can be lowered. However, when the temperature of the second battery is close to that of the first battery before cooling, the temperature difference between the first battery and the second battery may first decrease and then increase during the cooling process of the first battery, and the temperature difference between the first battery and the second battery after cooling may be greater than the first temperature difference threshold, in which case the second battery needs to be cooled.

[0077] In order to further improve the cooling efficiency of the battery, a cooling process can be performed based on the temperature difference and temperature of the first battery and the second battery. As shown in FIG6 , the cooling process includes:

[0078] In S601, when the highest temperature among the temperatures of two or more measuring points in the first battery is greater than a predetermined first temperature threshold, the first temperature difference is compared with a predetermined second temperature difference threshold; or when the temperature of the first battery is greater than the predetermined second temperature threshold, the first temperature difference is compared with a predetermined second temperature difference threshold.

[0079] The second temperature difference threshold is smaller than the first temperature difference threshold.

[0080] When the temperature of the first battery is detected to be high, including when the first temperature is greater than a second temperature threshold, or when the maximum temperature of the first battery is greater than the first temperature threshold, a cooling operation may be triggered. To more efficiently perform the cooling operation, the embodiment of the present application further includes comparing the first temperature difference with a predetermined second temperature difference threshold. The second temperature difference threshold is less than the first temperature difference threshold.

[0081] In S602 , when the first temperature difference is less than a predetermined second temperature difference threshold, the first battery and the second battery are cooled.

[0082] If the first temperature difference is less than a predetermined second temperature difference threshold, it indicates that the first temperature is close to the second temperature. If the first battery is cooled alone, when the temperature of the first battery is lowered to less than or equal to the second temperature threshold, the temperature difference between the first battery and the second battery will be large, which may trigger cooling of the second battery again. To improve battery cooling efficiency, synchronous cooling of the first and second batteries can be triggered.

[0083] For example, the first temperature difference threshold is 3 degrees Celsius, and the second temperature difference threshold can be 1-2 degrees Celsius, such as 2 degrees Celsius. For example, if the first temperature is 30.5 degrees Celsius and the second temperature is 29 degrees Celsius, the first temperature difference is 1.5 degrees Celsius, which is less than the second temperature difference threshold, and the first and second batteries can be cooled simultaneously. This can reduce the cooling time of the first and second batteries and improve the cooling efficiency of the batteries.

[0084] When cooling the first and second batteries, the cooling process can be performed simultaneously. If the cooling efficiency is the same, the temperature of the second battery will always be lower than that of the first battery. Therefore, the temperature of the second battery can be monitored to determine when to stop cooling. For example, if the temperature of the second battery is detected to be less than or equal to a predetermined second temperature threshold, the cooling process for the first and second batteries can be stopped, allowing the temperature of the second battery to drop to a lower temperature and bringing the temperatures of the first and second batteries closer together.

[0085] In a possible implementation, the first unit for cooling the first battery and the second unit for cooling the second battery can be independently controlled based on the temperature difference between the first battery and the second battery, so that the temperatures of the first battery and the second battery after cooling are the same and are both less than or equal to the second temperature threshold, or are within the temperature range determined by the second temperature threshold.

[0086] For example, the operating time of the first unit can be controlled to be longer than the operating time of the second unit, so that the first unit cools the first battery more than the second battery, so that after the cooling is completed, the temperatures of the first battery and the second battery are consistent.

[0087] In a possible implementation, statistical results can be used to identify batteries with similar temperatures. These batteries can then be connected to the same generator set via parallel pipes. When cooling two batteries in the parallel connection is required, the generator set can be operated and the controllable valves in the corresponding pipes can be opened to cool both the first and second batteries. This helps reduce the number of generator sets operating and lowers power consumption.

[0088] In a possible implementation, embodiments of the present application may further first determine the maximum temperature of a battery and identify that battery as the first battery. The maximum temperature is determined as the first temperature. When the first temperature is greater than a predetermined first temperature threshold, one or more battery temperatures are determined whose temperature difference from the first temperature is less than a predetermined second temperature difference threshold. These one or more batteries are cooled simultaneously with the first battery, thereby further improving the cooling efficiency of the system and enhancing overall battery performance.

[0089] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0090] FIG7 is a schematic diagram of a battery temperature control device provided in an embodiment of the present application. As shown in FIG7 , the device includes:

[0091] A temperature acquisition unit 701 is configured to acquire a first temperature of a first battery and a second temperature of a second battery in an electrical device;

[0092] a temperature difference determining unit 702, configured to determine a first temperature difference according to the first temperature and the second temperature;

[0093] The cooling processing unit 703 is configured to perform cooling processing on the first battery when the first temperature difference is greater than a predetermined first temperature difference threshold, wherein the first temperature is higher than the second temperature.

[0094] The battery temperature control device shown in FIG7 corresponds to the battery temperature control method shown in FIG3 .

[0095] Figure 8 is a schematic diagram of a battery temperature control system provided in one embodiment of the present application. As shown in Figure 8 , the battery temperature control system 8 of this embodiment includes a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80, such as a battery temperature control program. When the processor 80 executes the computer program 82, it implements the steps of each of the aforementioned battery temperature control method embodiments. Alternatively, when the processor 80 executes the computer program 82, it implements the functions of each module / unit in each of the aforementioned device embodiments.

[0096] Exemplarily, the computer program 82 may be divided into one or more modules / units, which are stored in the memory 81 and executed by the processor 80 to implement the present application. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 82 in the battery temperature control system 8.

[0097] The battery temperature control system may include, but is not limited to, a processor 80 and a memory 81. Those skilled in the art will appreciate that FIG8 is merely an example of the battery temperature control system 8 and does not limit the battery temperature control system 8 . The battery temperature control system 8 may include more or fewer components than shown, or may combine certain components or different components. For example, the battery temperature control system may further include input and output devices, network access devices, buses, and the like.

[0098] The processor 80 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0099] The memory 81 may be an internal storage unit of the battery temperature control system 8, such as a hard disk or memory of the battery temperature control system 8. The memory 81 may also be an external storage device of the battery temperature control system 8, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the battery temperature control system 8. Furthermore, the memory 81 may include both an internal storage unit of the battery temperature control system 8 and an external storage device. The memory 81 is used to store the computer program and other programs and data required by the battery temperature control system. The memory 81 may also be used to temporarily store data that has been output or is about to be output.

[0100] In addition, an embodiment of the present application further provides an electrical device comprising two or more batteries, wherein the batteries of the electrical device are cooled using the above-mentioned battery temperature control method. The device may include a heavy truck or other large-scale mechanical equipment.

[0101] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0102] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0103] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0104] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0105] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0106] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0107] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, which can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0108] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A battery temperature control method, characterized in that: The method comprises: Acquire a first temperature of a first battery and a second temperature of a second battery in the electrical device; determining a first temperature difference according to the first temperature and the second temperature; When the first temperature difference is greater than a predetermined first temperature difference threshold, the first battery is cooled, wherein the first temperature is higher than the second temperature.

2. The method according to claim 1, characterized in that: The first temperature is an average value of temperatures at two or more measurement points in the first battery, and the second temperature is an average value of temperatures at two or more measurement points in the second battery.

3. The method according to claim 1, characterized in that The first temperature is an average value of temperatures of more than two cells in the first battery, or a temperature of a specified cell in the first battery; the second temperature is an average value of temperatures of more than two cells in the second battery, or a temperature of a specified cell in the second battery.

4. The method according to any one of claims 1 to 3, characterized in that: Acquiring a first temperature of a first battery and a second temperature of a second battery in an electric device includes: Acquiring temperatures of multiple batteries of the electric device; A maximum temperature and a minimum temperature of the plurality of batteries are determined, wherein the maximum temperature is a first temperature of the first battery and the minimum temperature is a second temperature of the second battery.

5. The method according to any one of claims 1 to 3, characterized in that: Acquiring a first temperature of a first battery and a second temperature of a second battery in an electric device includes: Acquiring temperatures of multiple batteries in the electrical device; Determine that the lowest temperature of the plurality of batteries is the second temperature, and the battery corresponding to the second temperature is the second battery; Batteries other than the second battery are respectively regarded as first batteries, and first temperatures of the first batteries are determined.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: When the highest temperature of the plurality of battery cells in the first battery is greater than a predetermined first temperature threshold, the temperature reduction process is performed on the first battery.

7. The method according to claim 6, characterized in that The method further comprises: When the highest temperature of the plurality of battery cells of the first battery is less than or equal to a predetermined third temperature threshold, the cooling process for the first battery is stopped, and the third temperature threshold is less than the first temperature threshold.

8. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: When the first temperature of the first battery is greater than a predetermined second temperature threshold, the temperature reduction process is performed on the first battery.

9. The method according to claim 8, characterized in that The method further comprises: When the first temperature of the first battery is less than or equal to a predetermined fourth temperature threshold, the temperature reduction process for the first battery is stopped, and the fourth temperature threshold is less than the second temperature threshold.

10. The method according to any one of claims 1 to 9, characterized in that: The first battery is cooled by a first unit, and the second battery is cooled by a second unit. The first unit and the second unit communicate with a battery management system.

11. The method according to any one of claims 1 to 9, characterized in that: The battery is cooled by a generator set, the generator set is connected to a plurality of cooling channels through a controllable valve, the cooling channels include a first cooling channel and a second cooling channel, and the controllable valve includes a first controllable valve and a second controllable valve; The first battery is cooled through a first cooling channel, the second battery is cooled through a second cooling channel, the unit communicates with a battery control system, and the first controllable valve and the second controllable valve communicate with a battery management system.

12. A battery temperature control device, characterized in that: The device comprises: A temperature acquisition unit, used to acquire a first temperature of a first battery and a second temperature of a second battery in the electrical device; a temperature difference determining unit, configured to determine a first temperature difference according to the first temperature and the second temperature; A temperature reduction processing unit is used to perform a temperature reduction process on the first battery when the first temperature difference is greater than a predetermined first temperature difference threshold, wherein the first temperature is higher than the second temperature.

13. A battery temperature control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 11 are implemented.

14. An electrical device comprising two or more batteries, characterized in that: The battery of the electrical equipment is cooled by the temperature control method for the battery according to any one of claims 1 to 11.

15. A computer-readable storage medium storing 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 11 are implemented.

Images