A method, device and battery system for calculating the shortest remaining charging time

Abstract

The present application provides a method, device and battery system for calculating the shortest remaining charging time. The method includes: obtaining charging parameters of a battery, establishing a charging model according to the charging parameters, wherein the charging model includes multiple charging stages, and each charging stage corresponds to a maximum charging current; respectively calculating the first theoretical time of the battery in each charging stage to obtain multiple first theoretical time; accumulating multiple first theoretical time to obtain a first total time; reducing at least one charging current to obtain at least one corrected current and multiple original charging currents; respectively calculating the second theoretical time of the battery in each charging stage according to the corrected current and the original charging current; accumulating multiple second theoretical time to obtain a second total time; judging whether the second total time is less than the first total time; if so, determining the charging time according to the second total time, thereby reducing the charging time, facilitating users to reasonably arrange their itinerary and charging plans, and improving user experience.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a method, device and battery system for calculating the shortest remaining charging time. Background Art

[0002] A battery is a device that can be charged through an external power source and is reusable. It is charged through an external power source, converting electrical energy into chemical energy for storage, and then converting chemical energy into electrical energy for use by the device when needed.

[0003] Batteries are used in a wide range of applications. Batteries are important energy storage devices for electric and hybrid vehicles, providing long-lasting energy supply and efficient power output. Batteries play an important role in grid energy storage systems, storing excess electrical energy and releasing it when needed to balance grid loads, respond to sudden demands or unstable power supply. Batteries are used as power sources in portable electronic devices such as smartphones, tablets, and laptops. Batteries are also widely used in aerospace, medical equipment, wireless communication base stations and other fields.

[0004] However, in the process of implementing the embodiments of the present application, the inventors of the present application found that batteries, as an important energy storage device, play an important role in modern society. Matching a reasonable charging model for the battery to obtain a relatively short theoretical charging time is crucial for users to reasonably arrange their itinerary and charging plans. Summary of the invention

[0005] In view of the above problems, the present application provides a method, device and battery system for calculating the shortest remaining charging time, which overcomes the above problems or at least partially solves the above problem of needing to obtain a relatively short theoretical charging time.

[0006] According to one aspect of the present application, a method for calculating the shortest remaining charging time is provided, which is applied to a battery, and the method includes: obtaining charging parameters of the battery, establishing a charging model according to the charging parameters, wherein the charging model includes multiple charging stages, and each charging stage corresponds to a maximum charging current; obtaining the operating parameters of the battery in each charging stage, determining the charging current of the battery in each charging stage according to the charging model, and calculating the first theoretical time of the battery in each charging stage respectively to obtain multiple first theoretical time; accumulating the multiple first theoretical time to obtain a first total time; reducing at least one charging current in step B to obtain at least one corrected current and multiple original charging currents; calculating the second theoretical time of the battery in each charging stage respectively according to the corrected current and the original charging current to obtain multiple second theoretical time; accumulating the multiple second theoretical time to obtain a second total time; judging whether the second total time is less than the first total time; if so, determining the charging time according to the second total time.

[0007] In an optional manner, if the second total duration is greater than or equal to the first total duration, step D is entered again.

[0008] In an optional manner, the step of determining the charging duration according to the second total duration in step H includes: determining the second total duration as the charging duration.

[0009] In an optional manner, the step of determining the charging time according to the second total time in step H includes: adjusting the strategy of reducing at least one of the charging currents to obtain at least one secondary corrected current and multiple original charging currents; calculating the third theoretical time of the battery in each charging stage according to the secondary corrected current and the original charging current to obtain multiple third theoretical time; accumulating the multiple third theoretical time to obtain a third total time; judging whether the third total time is less than the second total time; if so, replacing the second total time with the third total time, and entering the strategy of adjusting and reducing at least one of the charging currents; if not, determining the second total time as the charging time.

[0010] In an optional manner, the step of reducing at least one charging current in step B in step D to obtain at least one corrected current and multiple original charging currents includes: using the maximum charging current of the charging stage after the current charging stage as the charging current of the current charging stage, and obtaining at least one corrected current and multiple original charging currents.

[0011] In an optional manner, the charging parameters in step A include battery temperature, the charging model includes a first model, the first model is established based on the maximum charging current and the battery temperature, the operating parameters of each charging stage in step B include the starting battery temperature, the first theoretical duration is the first duration, and step B includes: obtaining a temperature rise rate table, obtaining the temperature rise rate of each charging stage according to the charging current and the starting battery temperature of each charging stage; obtaining the cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model; calculating the first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the cut-off battery temperature of each charging stage.

[0012] In an optional manner, the charging parameters in step A include the battery SOC, the charging model includes a second model, the second model is established based on the maximum charging current and the battery SOC, the operating parameters of each charging stage in step B include the starting battery SOC, the first theoretical duration is the second duration, and step B includes: obtaining the rated capacity of the battery; obtaining the end battery SOC of each charging stage according to the charging current of each charging stage and the second model; calculating the second duration according to the rated capacity, starting battery SOC, end battery SOC and charging current of each charging stage.

[0013] In an optional manner, the charging parameters in step A include battery temperature and battery SOC, the charging model includes a first model and a second model, the first model is established based on the maximum charging current and battery temperature, and the second model is established based on the maximum charging current and SOC, the operating parameters of each charging stage in step B include a starting battery temperature and a starting battery SOC, and step B includes: obtaining a temperature rise rate table, and obtaining the temperature rise rate of each charging stage according to the charging current and the starting battery temperature of each charging stage; obtaining the cutoff battery temperature of each charging stage according to the charging current of each charging stage and the first model; calculating the first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the cutoff battery temperature of each charging stage; obtaining the rated capacity of the battery; obtaining the cutoff battery SOC of each charging stage according to the charging current of each charging stage and the second model; calculating the second duration according to the rated capacity, the starting battery SOC, the cutoff battery SOC and the charging current of each charging stage; obtaining the minimum value of the first duration and the second duration as the first theoretical duration.

[0014] In an optional manner, the battery has a charging efficiency, and the step of calculating the second duration includes: calculating the second duration based on the charging efficiency and the rated capacity of each charging stage, the starting battery SOC, the ending battery SOC and the charging current.

[0015] In an optional manner, the calculation formula for the first duration is:

[0016]

[0017] Among them, the For the n The first duration of the charging stage, For the n The cut-off battery temperature of each charging stage, For the n The starting battery temperature of each charging stage, For the n The temperature rise rate corresponding to each charging stage;

[0018]

[0019] Among them, the For the temperature range and charging current The temperature rise rate is limited to For the temperature range and charging current The temperature rise rate is limited to I n For the n The charging current in each charging stage is and For the I n The two ends of the charging current range.

[0020] In an optional manner, the calculation formula for the second duration is:

[0021]

[0022] Among them, the For the n The second duration of the charging stage, For the n The end battery SOC of the charging stage, the For the n The starting battery SOC of each charging stage is is the rated capacity, the For the nThe charging current in each charging stage is is the charging efficiency.

[0023] According to one aspect of an embodiment of the present application, a device for calculating the shortest remaining charging time is provided, which is applied to a battery, and the device includes: a first acquisition module, which is used to obtain the charging parameters of the battery, and establish a charging model according to the charging parameters, wherein the charging model includes multiple charging stages, and each charging stage corresponds to a maximum charging current; a first calculation module, which is used to obtain the operating parameters of the battery in each charging stage, determine the charging current of the battery in each charging stage according to the charging model, and calculate the first theoretical time of the battery in each charging stage respectively, to obtain multiple first theoretical time; a first accumulation module, which is used to accumulate the multiple first theoretical time. duration, obtaining a first total duration; a current adjustment module, used to reduce at least one of the charging currents, to obtain at least one corrected current and multiple original charging currents; a second calculation module, used to calculate the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, to obtain multiple second theoretical durations; a second accumulation module, used to accumulate the multiple second theoretical durations, to obtain a second total duration; a judgment module, used to judge whether the second total duration is less than the first total duration, if it is judged that the second total duration is less than the first total duration, then enter the determination module; the determination module is used to determine the charging duration according to the second total duration.

[0024] According to one aspect of an embodiment of the present application, a battery system is provided, which includes: at least one processor, and a memory, wherein the memory is communicatively connected to the at least one processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method as described above.

[0025] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor performs the steps of the above method.

[0026] The beneficial effects of the present application include: the present application provides a method for calculating charging time, which is applied to a battery, and the method includes: obtaining the charging parameters of the battery, establishing a charging model according to the charging parameters, the charging model including multiple charging stages, each of which corresponds to a maximum charging current; obtaining the working condition parameters of the battery in each charging stage, determining the charging current of the battery in each charging stage according to the charging model, respectively calculating the first theoretical time of the battery in each charging stage, and obtaining multiple first theoretical time; accumulating the multiple first theoretical time to obtain a first total time; reducing at least one of the charging currents, obtaining at least one corrected current and multiple original charging currents; calculating the second theoretical time of the battery in each charging stage according to the corrected current and the original charging current, and obtaining multiple second theoretical time; accumulating the multiple second theoretical time to obtain a second total time; judging whether the second total time is less than the first total time; if so, determining the charging time according to the second total time. Through this method, by reducing at least one of the charging currents, the charging time of charging the battery is reduced, so that it is convenient for users to arrange their trips reasonably, to arrange reliable charging plans, and to improve user experience and charging efficiency. In addition, the charging plan can be adjusted according to the final charging time and the charging current of each charging stage can be adjusted accordingly, so that when the user uses the charging plan to charge the battery, a shorter charging time can be obtained, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 is a schematic diagram of a system provided in an embodiment of the present application;

[0029] Figure 2 Schematic diagram of the hardware structure of the BMS module provided in the embodiment of the present application;

[0030] Figure 3 It is a flowchart of a method for calculating the shortest remaining charging time provided in an embodiment of the present application;

[0031] Figure 4 It is a schematic diagram of an implementation method of the first model provided in the embodiment of the present application;

[0032] Figure 5 is a schematic diagram of an implementation method of the second model provided in an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of a flow chart for calculating a first theoretical duration provided in an embodiment of the present application;

[0034] Figure 7 This is a schematic diagram of the difference in temperature rise rate of the battery under different currents in the same temperature range provided by the embodiment of the present application

[0035] Figure 8 It is a schematic diagram of charging according to the existing charging strategy;

[0036] Fig. 9 is a schematic diagram of charging according to a reduced charging current provided in an embodiment of the present application;

[0037] Fig.10 is another schematic diagram of charging according to a reduced charging current provided in an embodiment of the present application;

[0038] Fig.11 is a schematic diagram of another method of charging at a reduced charging current provided in an embodiment of the present application;

[0039] Fig.12 is a schematic diagram of determining the charging time of a battery according to the second total time provided in an embodiment of the present application;

[0040] Fig.13 It is a schematic diagram of a device for calculating the shortest remaining charging time provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field belong to the scope of protection of this application.

[0042] In addition, the technical features involved in the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] See also Figure 1 , Figure 1 1 is a schematic diagram of a system provided in an embodiment of the present application, which is applicable to the charging time calculation method and the charging time calculation device. The system includes a battery 100 and a BMS module 200. The battery 100 can be specifically configured in a variety of ways, not limited to Figure 1 The situation shown.

[0044] The battery 100 may include only one battery cell 10 , that is, the battery 100 is formed of a single battery cell 10 .

[0045] The battery 100 may include a plurality of battery cells 10 , and the plurality of battery cells 10 are connected in series or in parallel.

[0046] The battery 100 may also include a plurality of groups of electrochemical devices, wherein one group of electrochemical devices includes a plurality of battery cells 10 , and the plurality of battery cells 10 are connected in series or in parallel.

[0047] The battery 100 may be a lithium-ion battery, which mainly includes consumer batteries, power batteries and energy storage batteries. Among them, the consumer batteries usually require small size, light weight, high energy density and long cycle life, and are widely used in personal electronic devices such as mobile phones, laptops, tablet computers, digital cameras and portable music players. Among them, the power battery is mainly used in transportation tools such as new energy vehicles, electric bicycles, electric trains, etc., to provide the instantaneous high power output required by the vehicle to support operations such as acceleration and climbing. Among them, the energy storage battery is mostly used as a battery energy storage system for renewable energy such as solar energy, wind power, hydropower, etc., as well as in power grid peak and frequency regulation, backup power supply, microgrid and other occasions, mainly used for long-term storage and stable release of energy.

[0048] It is understandable that in some embodiments, the system further includes a BMS (Battery Management System) module 200, which is responsible for monitoring the operating status of the battery 100 and ensuring the safe and reliable operation of the battery 100. The BMS module 200 can monitor and collect the state parameters of the battery 100 (including but not limited to the voltage, current, temperature, insulation resistance, etc. of the battery 100) in real time, and perform necessary analysis and calculation on the relevant state parameters to obtain more state evaluation parameters, and realize effective control of the battery 100 according to a specific protection control strategy to ensure the safe and reliable operation of the entire battery 100. At the same time, the BMS module 200 can exchange information with other external devices 300 (PCS, EMS, fire protection system, etc.) through its own communication interface and analog / digital input interface to form a linkage control to ensure the safe, reliable and efficient operation of the battery 100.

[0049] In order to solve the technical problem in the prior art that the equalization time of a single battery cell cannot be calculated, an embodiment of the present application provides a method for calculating the charging time.

[0050] Embodiment 1

[0051] Before introducing the calculation method of the charging time in detail, the hardware structure of the BMS module 200 provided in the embodiment of the present application is described.

[0052] See also Figure 2 , Figure 2 : is a hardware structure diagram of the BMS module 200 provided in the embodiment of the present application, which can execute the charging time calculation method. The BMS module 200 includes

[0053] At least one processor 21 and memory 22 (communicatively connected Figure 2 A bus connection and a processor are used as an example). A person skilled in the art can understand that Figure 2 The structure shown is for illustration only and does not limit the structure of the above-mentioned battery. Figure 2 More or fewer components as shown, or with Figure 2 Different configurations shown.

[0054] The processor 21 is used to provide computing and control capabilities, and control the BMS module 200 to execute any method provided in the following application embodiments, thereby managing the battery 100 accordingly.

[0055] It can be understood that the processor 21 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0056] The memory 22, as a non-transient computer-readable storage medium, can be used to store non-transient software programs, non-transient computer executable programs and modules, such as program instructions / modules corresponding to the various calculation methods in the embodiments of the present application. The processor 21 can implement the various calculation methods in any of the following method embodiments by running the non-transient software programs, instructions and modules stored in the memory 22. The memory 22 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some embodiments, the memory 22 may also include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0057] Embodiment 2

[0058] The embodiment of the present application also provides a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used by a battery to execute each calculation method in any of the following method embodiments.

[0059] An embodiment of the present application provides a computer program product, including a computing program stored on a non-volatile computer-readable storage medium, wherein the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes each computing method in any of the following method embodiments.

[0060] Through the description of the above implementation methods, ordinary technicians in this field can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course it can also be implemented by hardware. Ordinary technicians in this field can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0061] Embodiment 3

[0062] The following is a discussion of a method for calculating the charging time provided in an embodiment of the present application, wherein the charging time provided in an embodiment of the present application is a theoretical value of the charging time of the battery.

[0063] See also Figure 3 , Figure 3 : is a flow chart of a method for calculating charging time provided in an embodiment of the present application, the method comprising the following steps:

[0064] Step A, obtaining charging parameters of the battery, and establishing a charging model according to the charging parameters, wherein the charging model includes a plurality of charging stages, and each charging stage corresponds to a maximum charging current.

[0065] The charging parameters may be charging parameters of the battery tested by an experimental method; or they may be charging parameters of the battery during a historical charging process. In some embodiments, the charging parameters include charging current and battery temperature; in other embodiments, the charging parameters include charging current and battery SOC; in yet other embodiments, the charging parameters include charging current, battery temperature, and battery SOC. SOC (State of Charge) is an indicator that describes the current remaining power of the battery, usually shown as a percentage.

[0066] It is understandable that the BMS module can obtain the charging parameters of the battery during the historical charging process. Specifically, the BMS module is provided with an AFE (Analog Front End), which is a series of circuits used to process analog signals in an electronic system. In the BMS module, the AFE is used to measure battery voltage, current and other parameters with high precision, and convert these analog signals into digital signals for further processing and analysis.

[0067] For different batteries, the charging current range may be different. For batteries used as new energy vehicles, they are generally designed for high-power discharge and fast charging. Their charging current range can range from 0.2C to 0.5C for slow charging, to 1C or higher for fast charging. The development of fast charging technology has enabled some batteries to be charged at higher currents, which may reach 2C, 3C or higher to shorten the charging time. The "C" here refers to the battery capacity. For example, a 100Ah battery is charged at 1C, and the temperature current is 100A.

[0068] In contrast, batteries used in energy storage systems for renewable energy sources such as solar power, wind power, and hydropower usually do not need to be charged as quickly as batteries used in new energy vehicles. Therefore, the charging current range of batteries used in energy storage systems is usually lower, and the following charging currents may be set: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C, and 0.1C.

[0069] The charging model is established according to the charging parameters, and the charging model includes multiple charging stages, each of which corresponds to a charging current after current limiting, that is, the maximum charging current, that is, the maximum charging current is the maximum safe charging current or the maximum allowable current. That is, each charging stage is divided according to the maximum charging current. For example, the maximum charging current of the first charging stage is I 1. The maximum charging current in the second charging stage is I 2. The maximum charging current in the third charging stage is I 3, no. i The maximum charging current in each charging stage isI i .

[0070] In some embodiments, the maximum charging current is set according to the battery temperature. Figure 4 , Figure 4 An implementation form of a charging model is shown. Specifically, the charging model includes a first model, which is a relationship model established based on the maximum charging current and the battery temperature, and represents the relationship between the maximum charging current and the battery temperature.

[0071] The operating temperature range of the battery is usually -20℃ to 60℃. The optimal operating temperature range is 0℃ to 40℃. Within this range, the battery has better performance and can achieve normal charging and discharging efficiency. When the battery is at a lower temperature (for example, less than 25℃), the maximum charging current (called temperature current in the first model) is usually set to a higher constant value (for example, 1.2C) because the battery can withstand a larger charging rate without generating too much heat or side reactions. When the temperature gradually rises (such as 25℃-35℃), the temperature current needs to gradually decrease, because the higher the temperature, the weaker the battery's acceptance capacity, and the charging rate must be slowed down to avoid overcharging and accumulation of internal pressure. When the battery approaches high temperature (such as close to 60℃), the temperature current will further decrease to a very low level.

[0072] As an example, in the first model, the temperature current ( I Tn ) The following currents can be set: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C and 0.1C.

[0073] In some other embodiments, the maximum charging current is set according to the battery SOC. Figure 5 , Figure 5 Another implementation form of the charging model is shown. Specifically, the charging model includes a second model, which is a relationship model of SOC current and battery SOC established based on the maximum charging current and battery SOC, and represents the relationship between the maximum charging current and the battery SOC.

[0074] When the battery is at a low SOC, the maximum charging current (called SOC current in the second model) is usually set to a higher constant value (such as 1.2C) because the battery can withstand a larger charging rate without generating too much heat or side reactions. When the battery SOC is larger (such as SOC reaches more than 80%), the SOC current needs to gradually decrease because the battery's acceptance capacity is weakened and the charging rate must be slowed down to avoid overcharging and internal pressure accumulation. When the battery is close to being fully charged (SOC is close to 100%), the SOC current will be further reduced to a very low level, called trickle charge or float charge, to keep the battery in a fully charged state without causing overcharging.

[0075] As an example, in the second model, the SOC current ( I SOCn ) can be set to the following currents: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C and 0.1C.

[0076] In some further embodiments, the maximum charging current is set according to the battery temperature and the battery SOC, and the first model and the second model as above are established.

[0077] It is worth noting that each charging stage in the first model may be the same as or different from each charging stage in the second model, and the theoretical temperature current corresponding to each charging stage in the first model may be the same as or different from the theoretical SOC current corresponding to each charging stage in the second model.

[0078] Step B, obtaining the operating parameters of the battery in each charging stage, determining the charging current of the battery in each charging stage according to the charging model, and calculating the first theoretical duration of the battery in each charging stage respectively to obtain multiple first theoretical durations.

[0079] In some embodiments, when the charging model established in step A is the first model, the operating parameters of the battery at each charging stage include the temperature and current of each charging stage, and the temperature and current corresponding to each charging stage are used as the charging current of each charging stage. That is, each charging stage in the first model corresponds to a charging current, and each charging stage in the first model corresponds to a time interval, that is, the first duration.

[0080] When the charging model established in step A is the first model, obtaining the operating parameters of the battery in each charging stage also includes the starting battery temperature of each charging stage.

[0081] The starting battery temperature refers to the starting time of each charging stage after the entire process is divided into multiple charging stages. Starting battery temperature .

[0082] In other embodiments, when the charging model established in step A is the second model, the operating parameters of the battery in each charging stage include the SOC current in each charging stage, and the SOC current corresponding to each charging stage is used as the charging current in each charging stage. That is, each charging stage in the second model corresponds to a charging current, and each charging stage in the second model corresponds to a time interval, that is, the second duration.

[0083] When the charging model established in step A is the second model, obtaining the operating parameters of the battery in each charging stage also includes the initial battery SOC.

[0084] The starting battery SOC refers to the starting battery SOC for each charging stage after the entire process is divided into multiple charging stages.

[0085] In other embodiments, when the charging model established in step A includes the first model and the second model, the operating parameters of the battery in each charging stage are obtained including the temperature current and SOC current of each charging stage, and the first theoretical duration is subsequently calculated based on the temperature current and SOC current of each charging stage. When the charging model established in step A includes the first model and the second model, the operating parameters of the battery in each charging stage are obtained including the starting battery temperature and the starting battery SOC of each charging stage.

[0086] In some embodiments, see Figure 6 , step B comprises:

[0087] Step B1, obtaining a temperature rise rate table, and obtaining the temperature rise rate of each charging stage according to the charging current and the initial battery temperature of each charging stage.

[0088] The temperature rise rate may be a temperature rise rate table as shown in Table 1 below. The temperature rise rate table may be established based on the battery temperature and charging current measured under experimental conditions.

[0089] As an example, assuming that the battery temperature range in which the battery can operate is divided into 5 segments and the charging current is divided into 9 segments, the corresponding temperature rise rates are obtained as shown in Table 1 below:

[0090] Table 1 Temperature rise rate at different charging currents in each battery temperature range (℃)

[0091]

[0092] Figure 7 The difference in the temperature rise rate of the battery at different currents in the same temperature range is shown in Table 1 and Figure 7It can be seen that different battery temperatures and different charging currents correspond to different temperature rise rates. According to the starting battery temperature of each charging stage and the charging current of each charging stage, the temperature rise rate of each charging stage can be calculated.

[0093] For example, by querying the temperature rise rate table (such as Table 1), it is obtained that the starting battery temperature of the current charging stage is in the temperature range The current charging stage is a charging stage being calculated when calculating the shortest remaining charging time. The charging current corresponding to the current charging stage is I n At charging current The calculation formula for the temperature rise rate in the current charging stage is:

[0094]

[0095] Among them, the For the n The temperature rise rate corresponding to the (current) charging stage, the For the temperature range and charging current The temperature rise rate is limited to For the temperature range and charging current The temperature rise rate is limited to and are the two ends of the charging current interval in which the charging current is located, and the I n For the said n The charging current during the current charging phase.

[0096] Step B2: acquiring a cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model.

[0097] Since the first model is based on the maximum charging current and battery temperature, each charging stage corresponds to a charging current, a starting battery temperature, and a cutting-off battery temperature. Figure 4 , the charging current corresponding to the third charging stage is I T3 , the starting battery temperature corresponding to the third charging stage is T3, and the ending battery temperature corresponding to the third charging stage is T4.

[0098] Step B3, calculating the first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the ending battery temperature of each charging stage.

[0099] Since the temperature rise rate is established based on the charging current and the battery temperature, and in the first model, for each charging stage, it corresponds to the charging current, the starting battery temperature and the ending battery temperature, the specific temperature rise rate value can be determined based on the charging current, the starting battery temperature and the ending battery temperature, and then the first duration can be calculated based on the temperature rise rate, the starting battery temperature and the ending battery temperature.

[0100] In some embodiments, the calculation formula of the first duration is:

[0101]

[0102] Among them, the For the n The first duration of the charging stage, For the n The cut-off battery temperature of each charging stage, For the n The starting battery temperature of each charging stage, For the n The temperature rise rate corresponding to each charging stage;

[0103] Step B4, obtaining the rated capacity of the battery.

[0104] The rated capacity of a battery refers to the minimum amount of electricity that the battery should be able to discharge under certain discharge conditions (such as a certain temperature, discharge rate, and termination voltage), usually expressed in ampere-hours or milliampere-hours. This indicator reflects the amount of electricity that the battery can store and is one of the important parameters for measuring battery performance. In practical applications, the rated capacity of a battery is of great significance in determining the battery's service life and replacement cycle.

[0105] The specific value of the rated capacity of the battery is pre-set in the battery, for example, in a battery management system (BMS).

[0106] Step B5: acquiring the end battery SOC of each charging stage according to the charging current of each charging stage and the second model.

[0107] Since the second model is established based on the maximum charging current and the battery SOC, for each charging stage, it corresponds to the charging current, the starting battery SOC and the ending battery SOC.

[0108] Step B6, calculating the second duration according to the rated capacity, the starting battery SOC, the ending battery SOC and the charging current of each charging stage.

[0109] In terms of calculating the charging current of the second duration, the charging current is specifically the charging current corresponding to each charging stage in the second model.

[0110] In some embodiments, when the charging efficiency of the battery is taken into consideration, the second time period may be calculated according to the charging efficiency, the rated capacity, the starting battery SOC, the ending battery SOC and the charging current.

[0111] In some embodiments, the calculation formula of the second duration is:

[0112]

[0113] Among them, the n the second duration of the charging stage, n The end battery SOC of the charging stage, No. n The starting battery SOC of the charging stage, the 额 is the rated capacity, the n the charging current of each of the charging stages, the is the charging efficiency.

[0114] In some embodiments, the charging efficiency is calculated as follows:

[0115]

[0116] Among them, the is the charging efficiency, is the total discharge amount of the battery during the last full charge and discharge process, It is the total charge capacity of the battery during the last full charge and discharge process.

[0117] Here, "last time" refers to the full filling and discharging process closest to the current moment.

[0118] Among them, the total discharge amount during the last full charge and discharge process and the total charge amount during the last full charge and discharge process can be obtained from the battery management system (BMS).

[0119] In some embodiments, the total charge capacity during the last full charge and discharge process can be obtained by the ampere-hour integration method, and the calculation formula is:

[0120]

[0121] Among them, the Q CellAccumulateis the total charge capacity of the battery during the last full charge and discharge process, t1 is the charging start time, t2 is the charging cut-off time, I ( t ) is the current during the last full charging process.

[0122] The total discharge amount during the last full charge and discharge process can be calculated by referring to the above formula for the total charge amount during the last full charge and discharge process.

[0123] It is worth noting that, in some embodiments, the charging efficiency may also be a preset fixed value, such as 96%, 97% or 98%.

[0124] It is understandable that, in some embodiments, the charging efficiency may not be introduced when calculating the second duration, that is, the second duration is calculated only based on the rated capacity, the starting battery SOC, the ending battery SOC and the charging current. When the charging efficiency is introduced, it is more in line with the actual situation of battery charging, so that the calculation of the second duration is more accurate.

[0125] Step B7: Obtain the minimum value of the first duration and the second duration as the first theoretical duration.

[0126]

[0127] in, For the n The first theoretical duration of a charging phase, For the n The first duration of the charging phase, For the n The second duration of the charging phase.

[0128] It is worth noting that Figure 4 and Figure 5 The first model and the second model are shown as examples. When the first duration is smaller than the second duration, that is, the battery temperature will reach the next charging stage first, then the charging current will also enter the next charging stage. Similarly, when the second duration is smaller than the first duration, that is, the battery SOC will reach the next charging stage first, then the charging current will also enter the next charging stage. Based on this, when the charging model includes the first model and the second model, the first theoretical duration takes the minimum value of the first duration and the second duration.

[0129] It is worth noting that the above example shows the case where the first theoretical duration is the minimum of the first duration and the second duration; when the charging model only includes the first model, the first theoretical duration is the first duration; when the charging model only includes the second model, the first theoretical duration is the second duration.

[0130] Step C, accumulating the multiple first theoretical durations to obtain a first total duration.

[0131] Since each charging stage corresponds to a first theoretical duration, a plurality of first theoretical durations are accumulated to obtain a first total duration of the battery during the charging process, and the first total duration is a theoretical value.

[0132] It can be understood that when the first theoretical time is the minimum of the first time and the second time, the minimum value of the first time and the second time corresponding to each charging stage is accumulated; when the first theoretical time is the first time, the first time corresponding to each charging stage is accumulated; when the first theoretical time is the second time, the second time corresponding to each charging stage is accumulated.

[0133] Step D, reducing at least one charging current in step B to obtain at least one corrected current and multiple original charging currents.

[0134] In actual production applications, the applicant found that the existing charging strategy for the battery is to charge the battery based on the maximum charging current limited by the battery temperature and / or the battery SOC. Due to the SOC and battery temperature conditions in different situations, the charging time of charging using a fixed maximum charging current limited by the battery temperature and / or the battery SOC is actually longer than the charging time of charging by reducing the charging current of the first charging stage. Therefore, when the charging current corresponding to at least one charging stage is reduced, it is expected to obtain a shorter charging time than the existing charging strategy. Therefore, in an embodiment of the present application, a strategy of reducing at least one of the charging currents is adopted to obtain a shorter charging time than the existing charging strategy.

[0135] It is worth noting that the above-mentioned correction current is a reduced charging current, and the above-mentioned original charging current is actually an unreduced charging current.

[0136] When reducing the charging current, the charging current corresponding to only one of the charging stages may be reduced, or the charging current corresponding to multiple charging stages may be reduced. When reducing the charging current corresponding to multiple charging stages, the values ​​of the charging currents after the reductions may be the same or different.

[0137] In some embodiments, the method of reducing at least one of the charging currents to obtain at least one corrected current and multiple original charging currents may specifically be to use the maximum charging current of the charging stage after the current charging stage as the charging current of the current charging stage to obtain at least one corrected current and multiple original charging currents, thereby ensuring that the current used to charge the battery during the entire charging process is less than the charging current limited by the charging model, that is, the current used to charge the battery is less than the maximum safe charging current.

[0138] The charging stage after the current charging stage is the charging stage after the current charging stage, that is, the charging stage close to the charging cut-off end. i The charging current of the first charging stage can be i +1 The charging current of the first charging stage, or use the i+2 Each charging stage corresponds to the charging current.

[0139] For example, see Figure 8 , Figure 8 Strategy 1 in FIG. 1 is a schematic diagram of charging according to the existing charging strategy. Fig. 9 , Fig. 9 is a schematic diagram of charging according to a reduced charging current provided in an embodiment of the present application; Fig. 9 The charging current of the first charging stage is replaced by the charging current of the second charging stage, that is, the charging current of the first charging stage is reduced to the charging current of the second charging stage. Fig.10 , Fig.10 is another schematic diagram of charging according to a reduced charging current provided in an embodiment of the present application; Fig.10 The charging current of the first charging stage is replaced by the charging current of the second charging stage, that is, the charging current of the first charging stage is reduced to the charging current of the second charging stage; in addition, Fig.10 The charging current of the third charging stage is used to replace the charging current of the second charging stage, that is, the charging current of the second charging stage is reduced to the charging current of the third charging stage. Fig.11 , Fig.11 is a schematic diagram of another method of charging at a reduced charging current provided in an embodiment of the present application; Fig.11 The charging current of the fourth charging stage is used to replace the charging currents of the first charging stage, the second charging stage and the third charging stage, that is, the charging current of the first charging stage is reduced to the charging current of the fourth charging stage, the charging current of the second charging stage is reduced to the charging current of the fourth charging stage, and the charging current of the third charging stage is reduced to the charging current of the fourth charging stage.

[0140] Step E: calculating the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, and obtaining a plurality of second theoretical durations.

[0141] It is worth noting that the calculation method of the second theoretical duration can be obtained according to the corrected current and the original charging current, with reference to the calculation theory of the first theoretical duration, and will not be repeated here.

[0142] Step F, accumulating the multiple second theoretical durations to obtain a second total duration.

[0143] Since each charging stage corresponds to a second theoretical duration, a plurality of second theoretical durations are accumulated to obtain a second total duration of the battery during the charging process, and the second total duration is also a theoretical value.

[0144] Step G, determine whether the second total duration is less than the first total duration, if so, execute step H, if not, execute step D.

[0145] Step H: determining the charging duration according to the second total duration.

[0146] When at least one of the charging currents is reduced, and the second total duration of the battery is calculated based on the reduced charging current (corrected current) and the non-reduced charging current (original charging current), if the second total duration is less than the first total duration, the charging duration can be determined based on the second total duration.

[0147] It is worth noting that when at least one of the charging currents is reduced, and the second total duration of the battery calculated based on the reduced charging current (corrected current) and the unreduced charging current (original charging current) is greater than or equal to the first total duration, it means that the charging duration is not shortened due to the reduced charging current. At this time, the charging current reduction strategy can be adjusted, that is, entering step D. For example, when only the charging current of the first charging stage is reduced to the charging current of the second charging stage (such as Fig. 9 When the calculated second total duration is greater than or equal to the first total duration, the charging current of the first charging stage can be reduced to the charging current of the second charging stage and the charging current of the second charging stage can be reduced to the charging current of the third charging stage (such as Fig.10 Strategy 3 shown), if the second total duration calculated at this time is less than the first total duration, execute step H; if the second total duration calculated at this time is greater than or equal to the first total duration, continue to execute step D until the second total duration is less than the first total duration, then execute step H.

[0148] In some embodiments, the step of determining the charging time according to the second total time may specifically be determining the second total time as the charging time, and determining the second total time as the charging time for charging the battery, thereby obtaining a charging time shorter than the existing charging strategy. In addition, the adjusted charging current and battery temperature and / or battery SOC of each charging stage corresponding to the finally determined charging time may be summarized to establish a new charging model, and the new charging model may be used to perform actual charging control on the battery.

[0149] The adjusted charging current includes the at least one correction current and a plurality of original charging currents.

[0150] In some embodiments, see Fig.12 The step of determining the charging duration according to the second total duration may also include the following steps:

[0151] Step H1, adjusting a strategy for reducing at least one of the charging currents to obtain at least one secondary corrected current and a plurality of original charging currents.

[0152] The method for adjusting the strategy of reducing at least one of the charging currents may be, for example, when in step D only the charging current of the first charging stage is reduced to the charging current of the second charging stage (such as Fig. 9 When the strategy 2 is shown, the adjusted strategy may be to reduce the charging current of the first charging stage to the charging current of the second charging stage and to reduce the charging current of the second charging stage to the charging current of the third charging stage (such as Fig.10 Alternatively, the charging current of the first charging stage is reduced to the charging current of the fourth charging stage, the charging current of the second charging stage is reduced to the charging current of the fourth charging stage, and the charging current of the third charging stage is reduced to the charging current of the fourth charging stage (such as Fig.11 Strategy 4 shown).

[0153] It is worth noting that the secondary corrected current is the charging current that is reduced after adjusting the strategy of reducing at least one of the charging currents, and the original charging current is actually the charging current that is not reduced.

[0154] When reducing the charging current, the charging current corresponding to only one of the charging stages may be reduced, or the charging current corresponding to multiple charging stages may be reduced. When reducing the charging current corresponding to multiple charging stages, the values ​​of the charging currents after the reduction may be the same or different.

[0155] In some embodiments, the method of adjusting the strategy of reducing at least one of the charging currents may specifically be to use the charging current corresponding to the later charging stage to replace the charging current corresponding to the earlier charging stage, to obtain at least one of the two corrected currents and a plurality of the original charging currents, thereby ensuring that during the entire charging process, the current used to charge the battery is less than the charging current limited by the charging model, that is, the current used to charge the battery is less than the maximum safe charging current.

[0156] The latter charging stage is the charging stage close to the charging end, and the earlier charging stage is the charging stage close to the charging start end. iThe charging current of the first charging stage is replaced by i+1 The charging current of the first charging stage, or replace it with the i+1 The charging current corresponding to the charging stage after the first charging stage.

[0157] Step H2, calculating the third theoretical duration of the battery in each charging stage according to the secondary corrected current and the original charging current, to obtain a plurality of third theoretical durations.

[0158] It is worth noting that the calculation method of the third theoretical duration can be obtained according to the secondary corrected current and the original charging current, with reference to the calculation theory of the first theoretical duration, which will not be described in detail here.

[0159] Step H3, accumulating the multiple third theoretical durations to obtain a third total duration.

[0160] Since each charging stage corresponds to a third theoretical duration, a third total duration of the battery during the charging process can be obtained by accumulating multiple third theoretical durations, and the third total duration is also a theoretical value.

[0161] Step H4, determine whether the third total duration is less than the second total duration, if so, execute step H5, if not, execute step H6.

[0162] Step H5, use the third total duration to replace the second total duration, and enter the step H1.

[0163] When the strategy of adjusting and reducing at least one of the charging currents is adopted, and the third total duration of the battery is calculated based on the reduced charging current (secondary corrected current) and the non-reduced charging current (original charging current), if the third total duration is less than the second total duration, it means that the shortest charging duration has not been obtained. In this case, the second total duration can be replaced by the third total duration, that is, the second total duration is always kept at the minimum value, and step H1 is entered for iteration; if the third total duration is greater than or equal to the second total duration, it means that the second total duration is the shortest charging duration obtained. In this case, step H6 can be entered to determine the second total duration as the charging duration.

[0164] For example, when the strategy of adjusting to reduce at least one of the charging currents is to reduce the charging current of the first charging stage to the charging current of the second charging stage and to reduce the charging current of the second charging stage to the charging current of the third charging stage (such as Fig.10Strategy 3 shown in the figure), if the third total time calculated at this time is greater than or equal to the second total time, step H6 is executed; if the third total time calculated at this time is less than the second total time, the second total time can be replaced by the third total time, that is, the second total time is always kept at the minimum value, and step H1 is entered for iteration, for example, the charging current of the first charging stage can be reduced to the charging current of the fourth charging stage, the charging current of the second charging stage can be reduced to the charging current of the fourth charging stage, and the charging current of the third charging stage can be reduced to the charging current of the fourth charging stage (such as Fig.11 Strategy 4 shown), until the third total duration is less than the second total duration, execute step H6.

[0165] Step H6, determining the second total duration as the charging duration.

[0166] Through the above steps H1 to H6, the shortest charging time of the battery can be obtained. In addition, the readjusted charging current and the battery temperature and / or the SOC of the battery in each charging stage corresponding to the finally determined charging time can be summarized to establish a revised charging model, and the revised charging model can be used to perform actual charging control on the battery.

[0167] Wherein, the readjusted charging current includes the at least one secondary correction current and a plurality of original charging currents.

[0168] In an embodiment of the present application, a method for calculating charging time is applied to a battery, and the method includes: obtaining the charging parameters of the battery, establishing a charging model according to the charging parameters, the charging model including multiple charging stages, each of which corresponds to a maximum charging current; obtaining the working condition parameters of the battery in each charging stage, determining the charging current of the battery in each charging stage according to the charging model, respectively calculating the first theoretical time of the battery in each charging stage, and obtaining multiple first theoretical time; accumulating the multiple first theoretical time to obtain the first total time; reducing at least one of the charging currents, obtaining at least one corrected current and multiple original charging currents; calculating the second theoretical time of the battery in each charging stage according to the corrected current and the original charging current, and obtaining multiple second theoretical time; accumulating the multiple second theoretical time to obtain the second total time; judging whether the second total time is less than the first total time; if so, determining the charging time according to the second total time. Through this method, by reducing at least one of the charging currents, the charging time of charging the battery is reduced, so that it is convenient for users to arrange their trips reasonably, to arrange reliable charging plans, and to improve user experience and charging efficiency. In addition, the charging plan can be adjusted according to the final charging time and the charging current of each charging stage can be adjusted accordingly, so that when the user uses the charging plan to charge the battery, a shorter charging time can be obtained, thereby improving the user experience.

[0169] Embodiment 4

[0170] The following is a discussion of the calculation device for the shortest remaining charging time provided by the embodiment of the present application. Fig.13 , Fig.131 is a schematic diagram of a device for calculating the shortest remaining charging time provided in an embodiment of the present application, wherein the device 1 for calculating the shortest remaining charging time comprises a first acquisition module 11, for acquiring the charging parameters of the battery, and establishing a charging model according to the charging parameters, wherein the charging model comprises a plurality of charging stages, and each of the charging stages corresponds to a maximum charging current; a first calculation module 12, for acquiring the operating parameters of the battery in each charging stage, and determining the charging current of the battery in each charging stage according to the charging model, and calculating the first theoretical time of the battery in each charging stage respectively, to obtain a plurality of first theoretical time; a first accumulation module 13, for accumulating the plurality of first theoretical time to obtain a first total time; a current adjustment module 14, for reducing at least one The charging current in the first calculation module 12 is used to obtain at least one corrected current and multiple original charging currents; the second calculation module 15 is used to calculate the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, and obtain multiple second theoretical durations; the second accumulation module 16 is used to accumulate the multiple second theoretical durations to obtain a second total duration; the judgment module 17 is used to judge whether the second total duration is less than the first total duration, if it is judged that the second total duration is less than the first total duration, then enter the determination module 18, if it is judged that the second total duration is greater than or equal to the first total duration, then enter the current adjustment module 14; the determination module 18 is used to determine the charging duration according to the second total duration.

[0171] In some embodiments, the charging parameters include battery temperature, the charging model includes a first model, the first model is established based on the maximum charging current and the battery temperature, the first theoretical duration is a first duration, and the first calculation module 12 includes a first acquisition unit 121, which is used to obtain a temperature rise rate table, and obtain the temperature rise rate of each charging stage according to the charging current and the starting battery temperature of each charging stage; a second acquisition unit 122 is used to obtain the cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model; a first calculation unit 123 is used to calculate the first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the cut-off battery temperature of each charging stage.

[0172] In some embodiments, the charging parameters include SOC, the charging model includes a second model, the second model is established based on the maximum charging current and SOC, the first theoretical duration is the second duration, and the first calculation module 12 includes a third acquisition unit 124, which is used to obtain the rated capacity of the battery; a fourth acquisition unit 125, which is used to obtain the cut-off battery SOC of each charging stage according to the charging current of each charging stage and the second model; a second calculation unit 126, which is used to calculate the second duration according to the rated capacity, starting battery SOC, cut-off battery SOC and charging current of each charging stage.

[0173] In some embodiments, the charging parameters include battery temperature and SOC, the charging model includes a first model and a second model, the first model is established based on the maximum charging current and the battery temperature, and the second model is established based on the maximum charging current and the SOC, the first calculation module 12 includes a first acquisition unit 121, which is used to obtain a temperature rise rate table, and obtain the temperature rise rate of each charging stage according to the charging current and the starting battery temperature of each charging stage; a second acquisition unit 122, which is used to obtain the cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model; a first calculation unit 123, which is used to obtain the temperature rise rate table of each charging stage. The invention relates to a method for calculating the first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the ending battery temperature of each charging stage; a third acquisition unit 124 is used to obtain the rated capacity of the battery; a fourth acquisition unit 125 is used to obtain the ending battery SOC of each charging stage according to the charging current of each charging stage and the second model; a second calculation unit 126 is used to calculate the second duration according to the rated capacity, the starting battery SOC, the ending battery SOC and the charging current of each charging stage; and a fifth acquisition unit 127 is used to obtain the minimum value of the first duration and the second duration as the first theoretical duration.

[0174] In some embodiments, the determination module 18 is specifically configured to determine the second total duration as the charging duration.

[0175] In some embodiments, the determination module 18 includes an adjustment unit 181, which is used to adjust the strategy of reducing at least one of the charging currents to obtain at least one secondary corrected current and multiple original charging currents; a third calculation unit 182, which is used to calculate the third theoretical duration of the battery in each charging stage according to the secondary corrected current and the original charging current, and obtain multiple third theoretical durations; an accumulation unit 183, which is used to accumulate the multiple third theoretical durations to obtain a third total duration; a judgment unit 184, which is used to judge whether the third total duration is less than the second total duration, if so, enter the replacement unit 185, if not, enter the determination unit 186; the replacement unit 185 is used to replace the second total duration with the third total duration, and enter the adjustment unit 181; the determination unit 186 is used to determine the second total duration as the charging duration.

[0176] In an embodiment of the present application, the charging parameters of the battery are obtained by a first acquisition module 11, and a charging model is established according to the charging parameters, wherein the charging model includes multiple maximum charging stages, and each charging stage corresponds to a charging current; the operating parameters of the battery in each charging stage are obtained by a first calculation module 12, and the charging current of the battery in each charging stage is determined according to the charging model, and the first theoretical duration of the battery in each charging stage is calculated respectively to obtain multiple first theoretical durations; the multiple first theoretical durations are accumulated by a first accumulation module 13 to obtain a first total duration; at least one of the charging currents is reduced by a current adjustment module 14 to obtain at least one corrected current and multiple original charging currents; The second calculation module 15 calculates the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, and obtains multiple second theoretical durations; the second accumulation module 16 accumulates the multiple second theoretical durations to obtain the second total duration; the judgment module 17 judges whether the second total duration is less than the first total duration, and if it is judged that the second total duration is less than the first total duration, the determination module 18 is entered; the determination module 18 determines the charging duration according to the second total duration, thereby reducing the charging duration of the battery by reducing at least one of the charging currents, so as to facilitate users to arrange their trips reasonably, facilitate users to arrange reliable charging plans, and improve user experience and charging efficiency. In addition, the charging plan can be adjusted according to the final determined charging duration and the charging current of each charging stage can be adjusted accordingly, so that when the user uses the charging plan to charge the battery, a shorter charging duration can be obtained, thereby improving user experience.

[0177] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calculating the shortest remaining charging time, characterized in that: Applied to a battery, the method comprises: Step A, obtaining charging parameters of the battery, and establishing a charging model according to the charging parameters, wherein the charging model includes a plurality of charging stages, and each charging stage corresponds to a maximum charging current; Step B, obtaining the operating parameters of the battery in each charging stage, determining the charging current of the battery in each charging stage according to the charging model, and respectively calculating the first theoretical duration of the battery in each charging stage to obtain multiple first theoretical durations; Step C, accumulating the plurality of first theoretical durations to obtain a first total duration; Step D, reducing at least one charging current in step B to obtain at least one corrected current and a plurality of original charging currents; Step E, calculating the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, to obtain a plurality of second theoretical durations; Step F, accumulating the plurality of second theoretical durations to obtain a second total duration; Step G, determining whether the second total duration is less than the first total duration; Step H: if yes, determining the charging time according to the second total time; The step of determining the charging duration according to the second total duration in step H comprises: adjusting a strategy for reducing at least one of the charging currents to obtain at least one secondary corrected current and a plurality of original charging currents; Calculating the third theoretical duration of the battery in each charging stage according to the secondary corrected current and the original charging current, to obtain a plurality of third theoretical durations; Accumulating the plurality of third theoretical durations to obtain a third total duration; Determining whether the third total duration is less than the second total duration; If yes, use the third total duration to replace the second total duration, and enter the strategy of adjusting and reducing at least one of the charging currents; If not, the second total duration is determined as the charging duration.

2. The method according to claim 1, characterized in that If not, then go to step D again.

3. The method according to claim 1 or 2, characterized in that: The step of determining the charging duration according to the second total duration in step H comprises: The second total duration is determined as the charging duration.

4. The method according to claim 1 or 2, characterized in that: The step of reducing at least one of the charging currents in step B in step D to obtain at least one corrected current and a plurality of original charging currents comprises: The maximum charging current of the charging stage after the current charging stage is used as the charging current of the current charging stage to obtain at least one of the correction currents and a plurality of the original charging currents.

5. The method according to claim 1, characterized in that In step A, the charging parameters include the battery temperature, the charging model includes a first model, and the first model is established based on the maximum charging current and the battery temperature. In step B, the operating parameters of each charging stage include the starting battery temperature, and the first theoretical duration is the first duration. Step B includes: Obtaining a temperature rise rate table, and obtaining the temperature rise rate of each charging stage according to the charging current and the initial battery temperature of each charging stage; Acquire a cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model; The first duration of each charging stage is calculated according to the temperature rise rate, the starting battery temperature and the ending battery temperature of each charging stage.

6. The method according to claim 1, characterized in that In step A, the charging parameter includes the battery SOC, the charging model includes a second model, and the second model is established based on the maximum charging current and the battery SOC. In step B, the operating condition parameter of each charging stage includes the starting battery SOC, and the first theoretical duration is the second duration. Step B includes: Obtaining the rated capacity of the battery; According to the charging current of each charging stage and the second model, acquiring the end battery SOC of each charging stage; The second duration is calculated according to the rated capacity, the starting battery SOC, the ending battery SOC and the charging current of each charging stage.

7. The method according to claim 1, characterized in that In step A, the charging parameters include battery temperature and battery SOC, the charging model includes a first model and a second model, the first model is established based on the maximum charging current and battery temperature, and the second model is established based on the maximum charging current and SOC, and the operating condition parameters of each charging stage in step B include a starting battery temperature and a starting battery SOC, and step B includes: Obtaining a temperature rise rate table, and obtaining the temperature rise rate of each charging stage according to the charging current and the initial battery temperature of each charging stage; Acquire a cut-off battery temperature of each charging stage according to the charging current of each charging stage and the first model; Calculating a first duration of each charging stage according to the temperature rise rate, the starting battery temperature and the ending battery temperature of each charging stage; Obtaining the rated capacity of the battery; According to the charging current of each charging stage and the second model, acquiring the end battery SOC of each charging stage; Calculating a second duration according to the rated capacity, the starting battery SOC, the ending battery SOC and the charging current of each charging stage; The minimum value of the first duration and the second duration is obtained as the first theoretical duration.

8. The method according to claim 6 or 7, characterized in that: The battery has a charging efficiency, and the step of calculating the second duration includes: The second duration is calculated according to the charging efficiency and the rated capacity of each charging stage, the starting battery SOC, the ending battery SOC and the charging current.

9. The method according to claim 8, characterized in that The calculation formula of the first duration is: Among them, the is the first duration of the nth charging stage, and the T n is the cut-off battery temperature at the nth charging stage, is the starting battery temperature of the nth charging stage, the R n is the temperature rise rate corresponding to the nth charging stage; Among them, the In the temperature range T L ~T H And charging current I H The temperature rise rate is limited to In the temperature range T L ~T H And charging current I L The temperature rise rate is limited, the I n is the charging current of the nth charging stage, and the I H and I L For the I n The two ends of the charging current range.

10. The method according to claim 9, characterized in that The calculation formula of the second duration is: Among them, the is the second duration of the nth charging stage, the SOC n is the cut-off battery SOC at the nth charging stage, is the starting battery SOC of the nth charging stage, the C 额 is the rated capacity, the I n is the charging current in the nth charging stage, and η is the charging efficiency.

11. A device for calculating the shortest remaining charging time, characterized in that: Applied to a battery, the device comprises: A first acquisition module, used for acquiring charging parameters of the battery, and establishing a charging model according to the charging parameters, wherein the charging model includes a plurality of charging stages, and each charging stage corresponds to a maximum charging current; A first calculation module is used to obtain the operating parameters of the battery in each charging stage, determine the charging current of the battery in each charging stage according to the charging model, and calculate the first theoretical duration of the battery in each charging stage respectively to obtain multiple first theoretical durations; A first accumulation module, used for accumulating the plurality of first theoretical durations to obtain a first total duration; A current adjustment module, used for reducing at least one of the charging currents to obtain at least one corrected current and a plurality of original charging currents; A second calculation module, used for respectively calculating the second theoretical duration of the battery in each charging stage according to the corrected current and the original charging current, to obtain multiple second theoretical durations; A second accumulation module, used for accumulating the plurality of second theoretical durations to obtain a second total duration; A judging module, used for judging whether the second total duration is less than the first total duration, and if it is judged that the second total duration is less than the first total duration, entering a determining module; A determination module, configured to determine the charging duration according to the second total duration; The determination module is specifically used for: adjusting a strategy for reducing at least one of the charging currents to obtain at least one secondary corrected current and a plurality of original charging currents; Calculating the third theoretical duration of the battery in each charging stage according to the secondary corrected current and the original charging current, to obtain a plurality of third theoretical durations; Accumulating the plurality of third theoretical durations to obtain a third total duration; Determining whether the third total duration is less than the second total duration; If yes, use the third total duration to replace the second total duration, and enter the strategy of adjusting and reducing at least one of the charging currents; If not, the second total duration is determined as the charging duration.

12. A battery system, characterized in that: include: at least one processor; as well as A memory, wherein the memory is communicatively connected to the at least one processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor performs the steps of the method according to any one of claims 1 to 10.

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