Battery charging method, device and equipment and vehicle

Abstract

The invention relates to a battery charging method, device and equipment and a vehicle and relates to the technical field of vehicles, and the method comprises the steps that the maximum refrigerating capacity distributed to a battery by a refrigerating system of the vehicle is determined according to the refrigerating capacity of the refrigerating system of the vehicle and the current refrigerating requirement of a passenger compartment of the vehicle; and charging the battery according to a target charging strategy corresponding to the current operation parameter of the battery and the charging control parameter matched with the maximum refrigerating capacity. The charging safety of the battery is ensured.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, in particular to the field of vehicle thermal management technology, and specifically to a battery charging method, device, equipment and vehicle. Background Art

[0002] At present, the charging rate (C) of the power battery of the vehicle at high temperature has reached a relatively high charging rate (such as 4C or 6C). In fact, in a high temperature environment, charging the power battery at a high charging rate will cause the heat generated by the battery to be greater than the cooling and heat dissipation provided by the vehicle thermal management system, breaking the balance between the heating power and the cooling power, causing the battery to heat up quickly during fast charging.

[0003] In order to improve the charging efficiency, a technical solution discloses a method for optimizing the charging strategy of a lithium battery, the optimization method comprising: adjusting the charging current in the current charging strategy according to the fact that the highest temperature that the lithium battery can reach is higher than the reference highest temperature and the corresponding current is also greater than the reference current, and regulating the charging current in advance to slow down the temperature rise rate of the battery cell and limit the maximum temperature of the battery cell, thereby extending the time of medium and high rate charging, and then improving the charging efficiency under the premise of ensuring charging safety. Another technical solution also discloses a charging control method, the method comprising: charging each battery one by one through multiple rounds of charging through charging control, thereby solving the problem of continuous high temperature of the battery during the charging process in the prior art, and improving the charging safety and charging efficiency of the energy storage device by executing different charging strategies.

[0004] It can be seen that the current technical solutions are all aimed at increasing the charging rate of power batteries. However, at high charging rates, the temperature of the battery will rise rapidly. If the vehicle's refrigeration system cannot effectively cool the battery, the battery will be at risk of lithium deposition and thermal runaway when charged at high temperatures, and the battery charging safety cannot be guaranteed. Summary of the invention

[0005] The present application provides a battery charging method, device, equipment and vehicle for ensuring battery charging safety. The technical solution of the present application is as follows: According to a first aspect of the present application, a battery charging method is provided, the method comprising: determining a maximum cooling capacity allocated to a battery by a refrigeration system of the vehicle according to a refrigeration capacity of the vehicle refrigeration system and a current refrigeration demand of a passenger compartment of the vehicle, and charging the battery according to a target charging strategy corresponding to current operating parameters of the battery and charging control parameters matching the maximum cooling capacity.

[0006] According to the above technical means, according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment, the maximum refrigeration capacity is allocated to the battery, and the charging control parameters matching the maximum refrigeration capacity are determined. Furthermore, the battery is charged according to the target charging strategy and charging control parameters corresponding to the current operating parameters of the battery. In this way, a charging strategy is provided for the battery within the refrigeration capacity range configured by the refrigeration system for the battery, avoiding thermal runaway of the battery, thereby ensuring the charging safety of the battery.

[0007] In one possible manner, the method further includes: obtaining multiple initial charging strategies according to current operating parameters of the battery and a reference maximum allowable peaking current (MAP), and using the initial charging strategy with the smallest charging parameter among the multiple initial charging strategies as the target charging strategy.

[0008] In one possible manner, the charging control parameters include one or more of the following: charging time; the maximum temperature of the battery during the charging process; and the temperature of the battery at the end of charging.

[0009] In one possible manner, the battery is charged according to a target charging strategy and charging control parameters corresponding to the current operating parameters of the battery, including: when the charging parameters and charging control parameters of the target charging strategy meet the charging conditions, the battery is charged according to the target charging strategy.

[0010] In one possible embodiment, the method further includes: when the target charging parameters and charging control parameters corresponding to the target charging strategy do not meet the charging conditions, adjusting the target charging strategy to obtain an adjusted charging strategy so that the charging parameters and charging control parameters corresponding to the adjusted charging strategy meet the charging conditions.

[0011] In one possible embodiment, the method further includes: adjusting the target charging strategy to obtain an adjusted charging strategy, including: determining an adjustment coefficient of the target charging strategy based on a difference between a charging parameter corresponding to the target charging strategy and a charging control parameter, and adjusting the target charging strategy based on the adjustment coefficient to obtain an adjusted charging strategy.

[0012] In one possible manner, adjusting the target charging strategy includes: adjusting the charging rate in the target charging parameters, and / or adjusting the charging duration in the target charging parameters.

[0013] In one possible manner, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0014] In one possible manner, the maximum cooling capacity allocated to the battery by the refrigeration system of the vehicle is determined based on the refrigeration capacity of the refrigeration system of the vehicle and the current refrigeration demand of the passenger compartment of the vehicle, including: determining the cooling capacity allocated to the passenger compartment by the refrigeration system of the vehicle based on the current refrigeration demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle. The maximum cooling capacity of the battery is determined based on the refrigeration capacity of the refrigeration system of the vehicle and the cooling capacity of the passenger compartment.

[0015] According to the above technical means, the cooling capacity is configured for the passenger compartment according to the cooling demand of the passenger compartment, and the battery is configured with the maximum cooling capacity. In this way, the cooling capacity of the passenger compartment is met while cooling the battery, and the comfort of the passenger compartment during charging is improved.

[0016] In one possible approach, the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system is determined based on the current cooling demand of the vehicle's passenger compartment and the ambient temperature of the vehicle, including: determining an initial cooling capacity based on the current cooling demand of the vehicle's passenger compartment and the ambient temperature of the vehicle, and reducing the initial cooling capacity when the initial cooling capacity is greater than or equal to a cooling capacity threshold, and determining the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0017] According to the above technical means, when a larger initial cooling capacity is configured for the passenger compartment, the cooling capacity configured for the passenger compartment is reduced, so that more cooling capacity can be allocated to the battery, thereby better cooling the battery.

[0018] According to a second aspect provided by the present application, a battery charging device is provided, the device comprising: a determination unit and a processing unit. The determination unit is used to determine the maximum cooling capacity allocated to the battery by the vehicle's refrigeration system according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment. The processing unit is used to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0019] In one possible manner, the processing unit is further configured to obtain multiple initial charging strategies according to current operating parameters of the battery and a reference maximum allowable charging current MAP. The processing unit is further configured to use the initial charging strategy with the smallest charging parameter among the multiple initial charging strategies as the target charging strategy.

[0020] In one possible manner, the charging control parameters include one or more of the following: charging time; the maximum temperature of the battery during the charging process; and the temperature of the battery at the end of charging.

[0021] In one possible manner, the processing unit is specifically configured to charge the battery according to the target charging strategy when the charging parameters and the charging control parameters of the target charging strategy meet the charging conditions.

[0022] In one possible embodiment, the processing unit is also used to: when the target charging parameters and charging control parameters corresponding to the target charging strategy do not meet the charging conditions, adjust the target charging strategy to obtain an adjusted charging strategy, so that the charging parameters and charging control parameters corresponding to the adjusted charging strategy meet the charging conditions.

[0023] In one possible manner, the processing unit is specifically used to: determine an adjustment coefficient of the target charging strategy according to a difference between a charging parameter corresponding to the target charging strategy and a charging control parameter, and adjust the target charging strategy according to the adjustment coefficient to obtain an adjusted charging strategy.

[0024] In one possible manner, the processing unit is specifically configured to: adjust a charging rate in a target charging parameter, and / or adjust a charging duration in a target charging parameter.

[0025] In one possible manner, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0026] In one possible manner, the determination unit is specifically configured to: determine the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle; and determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's refrigeration system and the cooling capacity of the passenger compartment.

[0027] In one possible manner, the determination unit is specifically used to: determine the initial cooling capacity based on the current cooling demand of the vehicle's passenger compartment and the ambient temperature of the vehicle, and when the initial cooling capacity is greater than or equal to a cooling capacity threshold, reduce the initial cooling capacity, and determine the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0028] According to the third aspect provided by the present application, there is provided a vehicle-mounted device, comprising: a processor; a memory for storing processor executable instructions; wherein the processor is configured to execute instructions to implement the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0029] According to the fourth aspect provided by the present application, a computer-readable storage medium is provided. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation method thereof.

[0030] According to the fifth aspect provided by the present application, a computer program product is provided, the computer program product comprising computer instructions, and when the computer instructions are executed on an electronic device, the electronic device executes the method of the above-mentioned first aspect and any possible implementation manner thereof.

[0031] According to a sixth aspect provided by the present application, a vehicle is provided, the vehicle comprising the on-board device as described in the third aspect.

[0032] It should be noted that the technical effects brought about by any implementation method in the second to sixth aspects can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0035] Figure 1 is a structural schematic diagram of a vehicle refrigeration system according to an exemplary embodiment; Figure 2 is one of the flowchart diagrams of a battery charging method according to an exemplary embodiment; Figure 3 is a schematic diagram showing a comparison of temperature rise of a battery before and after charging rate optimization according to an exemplary embodiment; Figure 4 is a schematic diagram showing power comparison of a battery before and after charging rate optimization according to an exemplary embodiment; Figure 5 is a second flow chart of a battery charging method according to an exemplary embodiment; Figure 6 is a third flow chart of a battery charging method according to an exemplary embodiment; Figure 7 is a structural schematic diagram of a battery charging device according to an exemplary embodiment; Figure 8 The figure is a schematic diagram showing the structure of a vehicle-mounted device according to an exemplary embodiment. DETAILED DESCRIPTION

[0036] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0038] As described in the background technology, under high charging rates, the temperature of the battery will rise rapidly. If the vehicle's refrigeration system cannot effectively cool the battery, the battery will be at risk of lithium deposition and thermal runaway when charging at high temperatures, and the battery charging safety cannot be guaranteed.

[0039] Specifically, the current battery charging rate in high temperature environments has reached 4C, or even 6C. However, high-rate charging of the battery in a high temperature environment does not necessarily result in the shortest charging time. Instead, it will result in a rapid temperature rise inside the battery, and the heat generated is far greater than the cooling and heat dissipation of the single battery in the vehicle's thermal management, which has broken the balance between heating power and cooling power, resulting in a rapid temperature rise of the battery during high-rate charging. Subsequently, if the battery temperature reaches the critical temperature value due to high-rate charging, the actual charging rate of the battery will drop sharply, and the charging time will also increase as the rate decreases.

[0040] In order to solve the above technical problems, an embodiment of the present application provides a battery charging method, which includes: determining the maximum cooling capacity allocated to the battery by the vehicle's refrigeration system according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment. The battery is charged according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0041] In this way, according to the cooling capacity of the vehicle's refrigeration system and the current cooling demand of the vehicle's passenger compartment, the maximum cooling capacity is allocated to the battery, and the charging control parameters matching the maximum cooling capacity are determined. Furthermore, the battery is charged according to the target charging strategy and charging control parameters corresponding to the current operating parameters of the battery. In this way, a charging strategy is provided for the battery within the cooling capacity range configured by the refrigeration system for the battery, avoiding thermal runaway of the battery, thereby ensuring the charging safety of the battery.

[0042] like Figure 1 As shown, Figure 11 is a schematic diagram showing a structure of a vehicle refrigeration system 100 according to an exemplary embodiment. The vehicle refrigeration system 100 may include an onboard device 101, a battery 102, and a passenger compartment 103. The onboard device 101 is communicatively connected to the battery 102 and the passenger compartment 103, respectively.

[0043] The vehicle-mounted device 101 is used to determine the maximum cooling capacity of the vehicle's cooling system allocated to the battery according to the cooling capacity of the vehicle's cooling system and the current cooling demand of the vehicle's passenger compartment. The vehicle-mounted device 101 is also used to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0044] The vehicle-mounted device 101 may be a main controller of the vehicle, or may be a controller of a thermal management system of the vehicle. The embodiment of the present application does not specifically limit the vehicle-mounted device 101.

[0045] The battery 102 may be a ternary lithium battery, a lithium iron phosphate battery, or a solid-state battery. In this regard, the embodiment of the present application does not specifically limit the battery 102.

[0046] For ease of understanding, the battery charging method provided in the present application is specifically introduced below with reference to the accompanying drawings.

[0047] Figure 2 This is a flow chart of a battery charging method according to an exemplary embodiment. The method includes: S201-S202.

[0048] S201. Determine a maximum cooling capacity allocated to the battery by the vehicle's refrigeration system according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment.

[0049] In some embodiments, when the vehicle is in a charging state, the on-board device obtains the maximum charging rate of the vehicle's battery, and when the maximum charging rate of the vehicle's battery is greater than or equal to a charging rate threshold, the on-board device determines the maximum cooling capacity allocated to the battery by the vehicle's refrigeration system and the cooling capacity of the passenger compartment based on the total cooling capacity of the vehicle and the cooling demand of the vehicle's passenger compartment.

[0050] It should be noted that the charging rate threshold is pre-configured. For example, the charging rate threshold may be 4C or 6C, which is not specifically limited in the embodiments of the present application.

[0051] In some embodiments, the on-board device determines the cooling demand of the passenger compartment in response to the user's operation of the cooling configuration of the passenger compartment, and determines the maximum cooling capacity allocated to the battery by the vehicle's refrigeration system and the cooling capacity of the passenger compartment based on the total cooling capacity of the vehicle and the cooling demand of the vehicle's passenger compartment.

[0052] For example, the vehicle-mounted device obtains the cooling temperature and air volume configured by the user for the passenger compartment, and determines the cooling demand of the passenger compartment based on the cooling temperature and air volume. Further, the vehicle-mounted device determines the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system based on the cooling demand, and determines the maximum cooling capacity of the battery based on the total cooling capacity of the vehicle and the cooling capacity of the passenger compartment.

[0053] For another example, the cooling demand includes the cooling temperature. The vehicle-mounted device determines the cooling capacity allocated to the passenger compartment by the vehicle's cooling system according to the cooling temperature and the ambient temperature of the vehicle, and determines the maximum cooling capacity allocated to the battery by the vehicle's cooling system according to the total cooling capacity and the cooling capacity of the passenger compartment.

[0054] S202: Charge the battery according to a target charging strategy corresponding to current operating parameters of the battery and charging control parameters matching the maximum cooling capacity.

[0055] As a possible implementation method, the vehicle-mounted device determines the charging control parameters of the battery according to the maximum cooling capacity and the performance parameters of the battery. The charging control parameters are used to characterize the extreme values ​​of the charging parameters of the battery during the charging process.

[0056] In some embodiments, the vehicle-mounted device inputs the maximum cooling capacity and the performance parameters of the battery into a first reference value algorithm to obtain the charging control parameters.

[0057] In other embodiments, the vehicle-mounted device inputs the second reference value algorithm according to the maximum cooling capacity, the performance parameters of the battery and the ambient temperature of the vehicle to obtain the charging control parameters.

[0058] It should be noted that the first reference value algorithm and the second reference value algorithm are pre-configured in the vehicle-mounted device.

[0059] In the embodiment of the present application, the charging control parameters include one or more of the maximum control temperature of the battery during the charging process, the discharge control power of the battery, the charging control time, and the end control temperature at the end of charging.

[0060] As another possible implementation method, the vehicle-mounted device determines the charging control parameters based on the driving demand power, the maximum cooling capacity and the performance parameters of the battery.

[0061] In the embodiment of the present application, the driving demand power can be used to determine the control temperature (or discharge power) when the battery ends charging and the charging control time.

[0062] It is understandable that the discharge power of the battery is strongly related to the temperature. Among them, due to the reduction of the charging rate in the later stage of battery charging, the battery temperature during the charging process is often higher than the charging temperature at the end of charging. If the charging temperature is too high during or at the end of charging, the battery discharge power will be too low and cannot meet the driving demand. Therefore, the maximum control temperature of the battery during the charging process or the control temperature when the battery ends charging is obtained according to the driving demand power.

[0063] In some embodiments, the vehicle-mounted device determines the target charging parameters corresponding to the target charging strategy, and determines whether the target charging parameters and charging control parameters corresponding to the target charging strategy meet the charging conditions. Further, the vehicle-mounted device charges the battery according to the target charging strategy when the target charging parameters and charging control parameters corresponding to the target charging strategy meet the charging conditions. When the target charging parameters and charging control parameters corresponding to the target charging strategy do not meet the charging conditions, the target charging strategy is adjusted to obtain an adjusted charging strategy so that the charging parameters and charging control parameters corresponding to the adjusted charging strategy meet the charging conditions.

[0064] In the embodiment of the present application, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0065] For example, taking the charging control parameters including the maximum control temperature and the charging control duration as an example, the vehicle-mounted device determines whether the maximum temperature in the target charging parameter is less than or equal to the maximum control temperature, and whether the charging duration in the target charging parameter is less than or equal to the charging control duration. If so, the battery is charged according to the target charging strategy. If not, the target charging strategy is adjusted.

[0066] For example, taking the charging control parameters including the maximum control temperature and the charging control time as an example, the vehicle-mounted device obtains the control comprehensive value according to the maximum control temperature and the charging control time, and determines the target comprehensive value according to the maximum temperature and the charging time in the target charging parameters. Further, the vehicle-mounted device determines whether the target comprehensive value is less than or equal to the control comprehensive value. If so, the battery is charged according to the target charging strategy.

[0067] For example, if the charging control parameters include the maximum control temperature and the charging control duration, the vehicle-mounted device determines whether the maximum temperature in the target charging parameter is less than or equal to the maximum control temperature. If so, the battery is charged according to the target charging strategy.

[0068] In other embodiments, when the target charging parameters and charging control parameters corresponding to the target charging strategy do not meet the charging conditions, the target charging strategy is adjusted to obtain an adjusted charging strategy. When the charging parameters and charging control parameters of the adjusted charging strategy meet the charging conditions, the battery is charged according to the adjusted charging strategy.

[0069] In the embodiment of the present application, adjusting the target charging strategy includes: adjusting the charging rate in the target charging parameters, and / or adjusting the charging duration in the target charging parameters.

[0070] In some embodiments, the charging rate in the target charging strategy is adjusted. For example, the charging rate in the target charging strategy is adjusted by the rate adjustment coefficient. For example, taking the rate adjustment coefficient of 0.85 as an example, the product of 0.85 and the charging rate in the target charging strategy is used as the charging rate of the adjusted charging strategy. For another example, if the charging rate in the target charging strategy is 5.5C, the portion exceeding 3C is multiplied by the rate adjustment coefficient of 0.65 to obtain the charging rate of the adjusted charging strategy to reduce the maximum rate.

[0071] In other embodiments, the charging rate in the target charging strategy is adjusted according to the maximum control temperature. For example, when the maximum control temperature is 55°C and the charging rate in the target charging strategy is greater than 2.5C, the charging rate in the target charging strategy is adjusted to 2.5C.

[0072] In some embodiments, the target charging strategy is adjusted according to the target charging parameters and charging control parameters corresponding to the target charging strategy to obtain an adjusted charging strategy. For example, an adjustment coefficient of the target charging strategy is determined according to the difference between the charging parameters and the charging control parameters corresponding to the target charging strategy, and the target charging strategy is adjusted according to the adjustment coefficient to obtain an adjusted charging strategy.

[0073] The battery charging method provided in the embodiment of the present application brings at least the following beneficial effects: according to the refrigeration capacity of the vehicle's refrigeration system and the current refrigeration demand of the vehicle's passenger compartment, the maximum refrigeration capacity is allocated to the battery, and the charging control parameters matching the maximum refrigeration capacity are determined. In this way, a charging strategy is provided for the battery within the refrigeration capacity range configured by the refrigeration system for the battery, thermal runaway of the battery is avoided, and the charging safety of the battery is ensured.

[0074] exist Figure 3 2 shows a schematic diagram of the temperature rise comparison of the battery before and after the charging rate optimization. Specifically, Figure 3The vertical axis represents the battery temperature, the horizontal axis represents the charging time (in seconds), the temperature rise curve 1 represents the temperature fluctuation curve before the charging rate is optimized, and the temperature rise curve 2 represents the temperature fluctuation curve after the charging rate is optimized. It can be seen that after the charging rate is optimized, the battery temperature rises slowly, and the battery temperature is relatively low for a long time, which can better protect the battery.

[0075] exist Figure 4 2 shows a schematic diagram of the power comparison of the battery before and after the charging rate optimization. Specifically, Figure 4 The vertical axis represents the charging power, the horizontal axis represents the charging time (in seconds), the charging power curve 1 represents the charging power fluctuation curve before the charging rate is optimized, and the charging power curve 2 represents the charging power fluctuation curve after the charging rate is optimized. It can be seen that after the charging rate is optimized, the charging power of the battery is relatively stable, which can better protect the battery.

[0076] In one design, in order to determine an accurate charging strategy, the battery charging method provided in the embodiment of the present application further includes: S203-S204.

[0077] S203 : Obtain multiple initial charging strategies according to the current operating parameters of the battery and a reference maximum allowable charging current MAP.

[0078] As a possible implementation method, the vehicle-mounted device obtains the current operating parameters of the battery, and obtains multiple initial charging strategies according to the current operating parameters of the battery and the maximum allowable charging current MAP.

[0079] In the embodiment of the present application, the operating parameters of the battery include the battery cell temperature and / or the battery state of charge (SOC).

[0080] In some embodiments, before charging the battery, the vehicle-mounted device obtains the operating parameters of the battery, and selects a charging strategy based on the operating parameters of the battery and a reference MAP to obtain multiple initial charging strategies.

[0081] In the embodiment of the present application, the charging strategy can be understood as a charging path. The charging strategy is used to indicate the charging rate (or charging current) of the battery in each charging stage.

[0082] S204: Using the initial charging strategy with the smallest charging parameter among the multiple initial charging strategies as the target charging strategy.

[0083] In some embodiments, the vehicle-mounted device obtains charging parameters of each initial charging strategy according to each initial charging strategy, the maximum cooling capacity, and the thermoelectric coupling model.

[0084] In the embodiment of the present application, the charging parameters include one or more of the maximum temperature of the battery during the charging process, the end temperature of charging, and the charging time.

[0085] In some embodiments, when the vehicle-mounted device obtains multiple charging parameters, the initial charging strategy corresponding to the minimum charging parameter among the multiple charging parameters is determined as the target charging strategy. It can be understood that the initial charging strategy with the lowest temperature and the shortest charging time is determined as the candidate charging strategy.

[0086] In some embodiments, when the lowest temperature and the shortest charging time are located in different charging parameters, the initial comprehensive value is obtained by weighted summing the highest temperature, the end temperature and the charging time. Further, the smallest comprehensive value among the multiple comprehensive values ​​is determined as the target comprehensive value, and the initial charging strategy corresponding to the target comprehensive value is determined as the target charging strategy.

[0087] In other embodiments, when the lowest temperature and the shortest charging time are in different charging parameters, the target charging parameter is determined according to the charging demand. For example, if the user needs fast charging, the charging parameter with the shortest charging time among multiple charging initial values ​​is used as the target charging parameter, and the initial charging strategy corresponding to the target charging parameter is determined as the target charging strategy.

[0088] It can be understood that the optimal charging strategy is determined based on the current operating parameters of the battery and the reference MAP, and it is determined whether the optimal charging strategy meets the charging demand. Further, when the optimal charging strategy meets the charging demand, the battery is charged according to the optimal charging strategy. In this way, a suitable charging strategy can be matched, and the battery can be charged quickly while ensuring the safety of the battery.

[0089] In one design, in order to improve the comfort of the passenger compartment and enhance the user's riding experience, the above S201 includes: S2011-S2012.

[0090] S2011. Determine the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system based on the current cooling demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle.

[0091] As a possible implementation method, the on-board equipment obtains the current cooling demand of the passenger compartment and the ambient temperature, and determines the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system based on the current cooling demand of the passenger compartment and the ambient temperature of the vehicle.

[0092] In some embodiments, the vehicle-mounted device obtains the cooling temperature of the passenger compartment, and determines the cooling capacity allocated to the passenger compartment by the vehicle's cooling system according to the cooling temperature, the ambient temperature, and the temperature correspondence. The temperature correspondence is a correspondence between the cooling temperature and the ambient temperature to determine the cooling capacity.

[0093] In some embodiments, the vehicle-mounted device determines the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system based on the refrigeration temperature, the ambient temperature, and the refrigeration function.

[0094] It should be noted that the cooling function is a pre-configured function.

[0095] In other embodiments, the vehicle-mounted device determines the initial cooling capacity of the passenger compartment according to the cooling temperature and the ambient temperature, and adjusts the initial cooling capacity to reduce the initial cooling capacity when the initial cooling capacity is greater than or equal to the cooling capacity threshold. Further, the vehicle-mounted device determines the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0096] It is understandable that when a larger cooling capacity is configured for the passenger compartment, in order to ensure the cooling capacity of the battery, the cooling capacity configured for the passenger compartment is reduced.

[0097] S2012. Determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's refrigeration system and the cooling capacity of the passenger compartment.

[0098] In some embodiments, the on-board device determines the total cooling capacity of the refrigeration system based on the refrigeration capacity of the vehicle's refrigeration system, and determines the maximum cooling capacity of the battery based on the total cooling capacity and the cooling capacity of the passenger compartment.

[0099] According to the above technical means, the cooling capacity is configured for the passenger compartment according to the cooling demand of the passenger compartment, and the battery is configured with the maximum cooling capacity. In this way, the cooling capacity of the passenger compartment is met while cooling the battery, and the comfort of the passenger compartment during charging is improved.

[0100] In order to better understand the battery charging method provided in the embodiment of the present application, Figure 5 As shown, a schematic flow chart of a battery charging method is shown, including: S301-S306.

[0101] S301. Obtain the ambient temperature of the vehicle.

[0102] In some embodiments, the vehicle-mounted device uses an ambient temperature sensor to obtain the current ambient temperature.

[0103] In some embodiments, the vehicle-mounted device determines a first heat exchange coefficient between the battery and the environment in which the vehicle is located according to the current ambient temperature, and determines a second heat exchange coefficient between the passenger compartment and the environment in which the vehicle is located.

[0104] S302: Obtain the total cooling capacity of the vehicle.

[0105] In some embodiments, the vehicle-mounted device determines the total cooling amount of the vehicle based on the cooling parameters and high and low pressure values ​​of the vehicle's thermal management system.

[0106] It can be understood that based on the vehicle thermal management system hardware arranged in the vehicle and the high and low pressure capabilities of the system, the overall cooling capacity of the current vehicle thermal management system is obtained, which is used as parameter input for subsequent calculations.

[0107] S303: Determine the operating mode of the thermal management system of the vehicle.

[0108] In some embodiments, the in-vehicle device obtains the operating mode of the thermal management system before charging the battery.

[0109] When the working mode is the single-opening mode of the battery, the total cooling capacity of the vehicle is allocated to the battery. When the working mode is the double-opening mode or the multi-opening mode, the maximum cooling capacity is allocated to the battery and the cooling capacity is allocated to the equipment to be refrigerated according to the cooling demand and the total cooling capacity of the equipment to be refrigerated (such as the passenger compartment). Further, multiple initial charging strategies are determined based on the maximum cooling capacity configured for the battery, the first heat exchange coefficient and the reference MAP. Further, a target charging strategy is determined from the multiple initial charging strategies, and it is determined whether the target charging parameter corresponding to the target charging strategy is less than or equal to the charging control parameter. Subsequently, when the target charging parameter is less than or equal to the charging control parameter, the battery is charged according to the target charging strategy. This step is detailed in S203 above.

[0110] In one case, based on the cooling capacity of the battery and the reference MAP, the maximum temperature and charging time that the battery temperature can reach under multiple initial charging strategies are calculated, and the calculated maximum temperature is compared with the maximum control temperature. If the maximum temperature is lower than the maximum control temperature, the charging strategy with the shortest charging time and the lowest battery temperature during the charging process is selected for charging. Otherwise, the calculated charging rate under the high-rate charging path is optimized to reduce the charging time and charging rate, thereby extending the charging time of the rate and controlling the temperature rise, and recalculating the maximum temperature based on the processed charging path, so that it always meets the highest reference temperature of the control.

[0111] S304: Determine the cooling capacity of the passenger compartment.

[0112] In some embodiments, the cooling capacity of the passenger compartment is determined based on the cooling temperature of the passenger compartment.

[0113] In other embodiments, the cooling capacity of the passenger compartment is determined based on the cooling temperature of the passenger compartment, the ambient temperature, and the second heat exchange coefficient.

[0114] In other embodiments, to ensure a certain degree of comfort in the passenger compartment during the charging process, the amount of cooling required to keep people in the passenger compartment at a comfortable temperature is determined based on the ambient temperature, and the cooling amount is determined as the cooling capacity of the passenger compartment.

[0115] S305: Determine the cooling capacity of the battery.

[0116] In some embodiments, the cooling capacity of the battery is determined based on the total cooling capacity of the vehicle and the cooling capacity of the passenger compartment.

[0117] S306: Determine the heat exchange amount of the battery.

[0118] In some embodiments, the heat exchange amount of the battery is determined based on the cooling capacity of the battery and the heat exchange efficiency of the battery.

[0119] In other embodiments, the heat exchange amount of the battery is determined based on the cooling capacity of the battery, the heat exchange efficiency of the battery, the ambient temperature, and the first heat exchange coefficient.

[0120] In order to better understand the battery charging method provided in the embodiment of the present application, Figure 6 As shown, a schematic flow chart of a battery charging method is shown, including: S401-S408.

[0121] S401, obtaining the ambient temperature, the operating parameters of the battery, and the heat exchange amount of the battery.

[0122] In the embodiment of the present application, the heat exchange amount of the battery includes the heat exchange amount between the battery and the environment and the heat exchange amount between the battery and the thermal management system.

[0123] S402 : Obtain multiple initial charging strategies according to the operating parameters of the battery and a reference MAP.

[0124] S403: Determine a target charging strategy.

[0125] S404: Determine target charging parameters.

[0126] S405: Determine whether the target charging parameter and the charging control parameter are less than or equal to the charging reference value.

[0127] If yes, then execute S406. If no, then execute S407.

[0128] S406: Charge the battery according to the current charging strategy.

[0129] S407: Adjust the target charging strategy to obtain an adjusted charging strategy.

[0130] S408: Determine charging parameters of the adjusted charging strategy.

[0131] In some embodiments, when the charging parameters of the adjusted charging strategy are determined, S405 is executed.

[0132] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to achieve the above functions, the communication device includes a hardware structure and / or software module corresponding to each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware 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 to be beyond the scope of the present application.

[0133] Figure 7 FIG. 1 is a schematic diagram showing a battery charging device according to an exemplary embodiment. Figure 7 The battery charging device 50 includes: a determining unit 501 and a processing unit 502.

[0134] The determination unit 501 is used to determine the maximum cooling capacity allocated to the battery by the vehicle's cooling system according to the cooling capacity of the vehicle's cooling system and the current cooling demand of the vehicle's passenger compartment. The processing unit 502 is used to charge the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters matching the maximum cooling capacity.

[0135] In one possible manner, the processing unit 502 is further configured to obtain multiple initial charging strategies according to the current operating parameters of the battery and the reference maximum allowable charging current MAP. The processing unit 502 is further configured to use the initial charging strategy with the smallest charging parameter among the multiple initial charging strategies as the target charging strategy.

[0136] In one possible manner, the charging control parameters include one or more of the following: charging time; the maximum temperature of the battery during the charging process; and the temperature of the battery at the end of charging.

[0137] In one possible manner, the processing unit 502 is specifically configured to charge the battery according to the target charging strategy when the charging parameters and the charging control parameters of the target charging strategy meet the charging conditions.

[0138] In one possible embodiment, the processing unit 502 is also used to: when the target charging parameters and charging control parameters corresponding to the target charging strategy do not meet the charging conditions, adjust the target charging strategy to obtain an adjusted charging strategy, so that the charging parameters and charging control parameters corresponding to the adjusted charging strategy meet the charging conditions.

[0139] In one possible manner, the processing unit 502 is specifically used to: determine an adjustment coefficient of the target charging strategy according to a difference between a charging parameter corresponding to the target charging strategy and a charging control parameter, and adjust the target charging strategy according to the adjustment coefficient to obtain an adjusted charging strategy.

[0140] In one possible manner, the processing unit 502 is specifically configured to: adjust the charging rate in the target charging parameter, and / or adjust the charging duration in the target charging parameter.

[0141] In one possible manner, the charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to the target threshold.

[0142] In one possible manner, the determination unit 501 is specifically configured to: determine the cooling capacity allocated to the passenger compartment by the vehicle's refrigeration system according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle; and determine the maximum cooling capacity of the battery according to the cooling capacity of the vehicle's refrigeration system and the cooling capacity of the passenger compartment.

[0143] In one possible manner, the determination unit 501 is specifically used to: determine the initial cooling capacity based on the current cooling demand of the vehicle's passenger compartment and the ambient temperature of the vehicle, and when the initial cooling capacity is greater than or equal to a cooling capacity threshold, reduce the initial cooling capacity, and determine the reduced cooling capacity as the cooling capacity of the passenger compartment.

[0144] Figure 8 FIG. 1 is a schematic diagram showing the structure of a vehicle-mounted device according to an exemplary embodiment. Figure 8 As shown, the vehicle-mounted equipment includes but is not limited to: a processor 601 , a memory 602 , an input device 603 and an output device 604 .

[0145] The memory 602 is used to store executable instructions of the processor 601. It can be understood that the processor 601 is configured to execute instructions to implement the battery charging method in the above embodiment.

[0146] It should be noted that those skilled in the art can understand that Figure 8 The vehicle-mounted device structure shown in the figure does not constitute a limitation on the vehicle-mounted device, and the vehicle-mounted device may include Figure 8 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0147] The processor 601 is the control center of the vehicle-mounted device. It uses various interfaces and lines to connect various parts of the entire vehicle-mounted device. By running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, it executes various functions of the vehicle-mounted device and processes data, thereby monitoring the vehicle-mounted device as a whole. The processor 601 may include one or more processing units. Optionally, the processor 601 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 601.

[0148] The memory 602 may be used to store software programs and various data. The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one functional module (such as a determination unit, a processing unit, etc.), etc. In addition, the memory 602 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0149] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 602 including instructions. The above instructions can be executed by a processor 601 of the vehicle-mounted device to implement the method in the above embodiment.

[0150] The input device 603 may be used to input battery operating parameters, ambient temperature, and passenger compartment configuration temperature, etc.

[0151] The output device 604 may be used to output a first cooling capacity of the passenger compartment and a second cooling capacity of the battery, etc.

[0152] Optionally, the computer-readable storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0153] In an exemplary embodiment, the embodiment of the present application also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 601 of the vehicle-mounted device to complete the method in the above embodiment.

[0154] It should be noted that when the instructions in the above-mentioned computer-readable storage medium or one or more instructions in the computer program product are executed by the processor of the vehicle-mounted device, the various processes of the above-mentioned method embodiment are implemented, and the same technical effect as the above-mentioned method can be achieved. To avoid repetition, they will not be repeated here.

[0155] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0156] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, 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.

[0157] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0158] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0159] If the integrated 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 readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or the full classification part or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute the full classification part or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0160] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery charging method, characterized in that: The method comprises: determining a maximum cooling capacity of a refrigeration system of the vehicle allocated to the battery based on a refrigeration capacity of the refrigeration system of the vehicle and a current refrigeration demand of a passenger compartment of the vehicle; The battery is charged according to a target charging strategy corresponding to current operating parameters of the battery and charging control parameters matching the maximum cooling capacity.

2. The method according to claim 1, characterized in that: The method further comprises: Obtaining a plurality of initial charging strategies according to current operating parameters of the battery and a reference maximum allowable charging current MAP; The initial charging strategy with the smallest charging parameter among the multiple initial charging strategies is used as the target charging strategy.

3. The method according to claim 2, characterized in that The charging control parameters include one or more of the following: Charging time; the maximum temperature of the battery during charging; The temperature of the battery at the end of charging.

4. The method according to any one of claims 1 to 3, characterized in that The charging of the battery according to the target charging strategy corresponding to the current operating parameters of the battery and the charging control parameters includes: When the charging parameters of the target charging strategy and the charging control parameters meet the charging conditions, the battery is charged according to the target charging strategy.

5. The method according to claim 4, characterized in that The method further comprises: When the target charging parameters corresponding to the target charging strategy and the charging control parameters do not satisfy the charging conditions, the target charging strategy is adjusted to obtain an adjusted charging strategy, so that the charging parameters corresponding to the adjusted charging strategy and the charging control parameters satisfy the charging conditions.

6. The method according to claim 5, characterized in that The method further includes: adjusting the target charging strategy to obtain an adjusted charging strategy, including: An adjustment coefficient of the target charging strategy is determined according to a difference between a charging parameter corresponding to the target charging strategy and the charging control parameter, and the target charging strategy is adjusted according to the adjustment coefficient to obtain the adjusted charging strategy.

7. The method according to claim 5, characterized in that The adjusting the target charging strategy includes: adjusting the charging rate in the target charging parameter, and / or adjusting the charging duration in the target charging parameter.

8. The method according to claim 5, characterized in that The charging condition is that the charging parameter is less than or equal to the charging control parameter, or the difference between the charging parameter and the charging control parameter is less than or equal to a target threshold.

9. The method according to any one of claims 1 to 3, characterized in that: The determining, based on the refrigeration capacity of the refrigeration system of the vehicle and the current refrigeration demand of the passenger compartment of the vehicle, a maximum refrigeration capacity allocated to the battery by the refrigeration system of the vehicle comprises: Determining a cooling capacity allocated to the passenger compartment by a refrigeration system of the vehicle according to a current cooling demand of the passenger compartment of the vehicle and an ambient temperature of the vehicle; The maximum cooling capacity of the battery is determined according to the cooling capacity of the cooling system of the vehicle and the cooling capacity of the passenger compartment.

10. The method according to claim 9, characterized in that The step of determining the cooling capacity allocated to the passenger compartment by the refrigeration system of the vehicle according to the current cooling demand of the passenger compartment of the vehicle and the ambient temperature of the vehicle comprises: An initial cooling capacity is determined based on a current cooling demand of the passenger compartment of the vehicle and an ambient temperature of the vehicle, and when the initial cooling capacity is greater than or equal to a cooling capacity threshold, the initial cooling capacity is reduced, and the reduced cooling capacity is determined as the cooling capacity of the passenger compartment.

11. A battery charging device, characterized in that: The device comprises: a determination unit and a processing unit; The determination unit is configured to determine a maximum cooling capacity allocated to the battery by the refrigeration system of the vehicle according to a refrigeration capacity of the refrigeration system of the vehicle and a current refrigeration demand of a passenger compartment of the vehicle; The processing unit is used to charge the battery according to a target charging strategy corresponding to current operating parameters of the battery and charging control parameters matching the maximum cooling capacity.

12. A vehicle-mounted device, characterized in that: including memory and processor; The memory is coupled to the processor; The memory is used to store computer program code, wherein the computer program code includes computer instructions; When the processor executes the computer instructions, the in-vehicle device executes the method as described in any one of claims 1-10.

13. A vehicle, characterized in that: The vehicle includes the vehicle-mounted device according to claim 12.

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