Method and device for determining charging path of lithium ion battery, vehicle and storage medium

Abstract

The invention provides a method and device for determining a charging path of a lithium ion battery, a vehicle and a storage medium, and the method comprises the steps: carrying out the discretization of a charging interval formed by an initial charge state and a target charge state of the lithium ion battery, and obtaining n discrete charge states; determining a charging duration calculation model according to the equivalent circuit model and the thermal model corresponding to the lithium ion battery; determining at least two preset battery temperatures corresponding to the discrete state of charge; according to the ith discrete state of charge, the (i-1) th discrete state of charge and a preset battery temperature, determining a target charging duration by using the charging duration calculation model; and determining a target charging path according to the target charging duration. According to the embodiment of the invention, the charging time of the lithium ion battery can be shortened, and the charging efficiency of the lithium ion battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a method, device, vehicle and storage medium for determining a charging path of a lithium-ion battery. Background Art

[0002] As the core power source of new energy vehicles, the performance and technical level of lithium-ion batteries for new energy vehicles have an important impact on the range, power performance and safety of electric vehicles. With the continuous advancement of technology and the continuous expansion of the market, lithium-ion batteries for new energy vehicles will show a trend of more diversification and high performance in the future.

[0003] At present, the charging method of lithium-ion batteries is a distributed step charging method based on a lithium-ion battery charging current map (Current Map). When the state of charge (SOC) of the lithium-ion battery is low, a larger current is used to charge the lithium-ion battery. When the SOC of the lithium-ion battery is high, a smaller current is used to charge the lithium-ion battery, so as to reduce the risk of lithium plating of graphite in the negative electrode of the lithium-ion battery at the end of charging and ensure the safety of the lithium-ion battery.

[0004] However, in actual application scenarios, when the temperature of the lithium-ion battery is greater than or equal to 25°C, as the charging current increases, the temperature of the lithium-ion battery will also rise sharply, thereby triggering the charging current limiting problem due to temperature reasons (generally current limiting is performed at 45°C to prevent the battery temperature from further rising), resulting in a longer charging time for the lithium-ion battery. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, vehicle and storage medium for determining a charging path of a lithium-ion battery, so as to solve the problem in the related art that the charging path is not an optimal charging path and the charging time is long during the charging process of the lithium-ion battery.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for determining a charging path of a lithium-ion battery, the method comprising:

[0007] Discretization is performed on a charging interval consisting of an initial state of charge of the lithium-ion battery and a target state of charge at the end of charging to obtain n discrete states of charge including the initial state of charge and the target state of charge; n is an integer greater than 2;

[0008] Determine a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation between the charging time, battery temperature and state of charge of the lithium-ion battery;

[0009] determining at least two preset battery temperatures corresponding to the discrete states of charge;

[0010] According to the i-th discrete state of charge, the i-1th discrete state of charge and the preset battery temperature corresponding to the i-th discrete state of charge, using the charging time calculation model, determining the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge; i is an integer greater than 0 and less than or equal to n;

[0011] A target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge is determined according to the target charging duration.

[0012] Optionally, the determining, based on the i-th discrete state of charge, the i-1th discrete state of charge and the preset battery temperature corresponding to the i-th discrete state of charge, using the charging duration calculation model, a target charging duration required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge includes:

[0013] determining a first difference between an i-th discrete state of charge and an (i-1)th discrete state of charge;

[0014] acquiring a first battery temperature corresponding to the (i-1)th discrete state of charge, and determining a second difference between a preset battery temperature corresponding to the (i)th discrete state of charge and the first battery temperature;

[0015] Calculate, according to the first difference, the second difference and the preset battery temperature, a first charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge at the preset battery temperature using the charging time calculation model;

[0016] According to the first charging times corresponding to the preset battery temperatures corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge is determined.

[0017] Optionally, determining a target charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge according to the first charging time corresponding to each of the preset battery temperatures corresponding to the (i)th discrete state of charge includes:

[0018] Determine a minimum charging time among the first charging time corresponding to each of the preset battery temperatures to obtain a second charging time;

[0019] When the number of the second charging duration is 1, determining the second charging duration as a target charging duration;

[0020] When the number of the second charging durations is greater than 1, a preset charging temperature corresponding to each of the second charging durations is determined, and a target charging duration is determined from the second charging durations according to the preset charging temperatures corresponding to the second charging durations.

[0021] Optionally, determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes:

[0022] determining a second charging time corresponding to a maximum temperature among preset charging temperatures corresponding to the second charging time as a target charging time; or

[0023] A second charging time corresponding to a minimum temperature among the preset charging temperatures corresponding to the second charging time is determined as a target charging time.

[0024] Optionally, determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes:

[0025] Determine a first temperature range consisting of a maximum temperature and a minimum temperature among the preset charging temperatures corresponding to the second charging duration;

[0026] Determining the intersection of the first temperature range and the target temperature range;

[0027] Determine the second charging time corresponding to the minimum temperature in the intersection as the target charging time; or,

[0028] The second charging duration corresponding to the maximum temperature in the intersection is determined as the target charging duration.

[0029] Optionally, after determining a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration, the method further includes:

[0030] Based on the target charging path, charging the lithium-ion battery;

[0031] According to the target charging path, the remaining charging time is synchronously output.

[0032] Optionally, synchronously outputting the remaining charging time according to the target charging path includes:

[0033] Obtaining the current real-time battery temperature and real-time state of charge of the lithium-ion battery;

[0034] Determine, according to the real-time state of charge, the target state of charge and a preset battery temperature corresponding to the target state of charge, a target charging time required to charge the lithium-ion battery from the real-time state of charge to the target state of charge using the charging time calculation model;

[0035] The target charging time is determined as the remaining charging time, and the remaining charging time is synchronously output.

[0036] Optionally, synchronously outputting the remaining charging time according to the target charging path includes:

[0037] Determine the total charging time corresponding to the target charging path;

[0038] Obtaining a third charging duration for charging the lithium-ion battery;

[0039] A third difference between the total charging time and the third charging time is determined as a remaining charging time, and the remaining charging time is synchronously output.

[0040] Optionally, determining a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery includes:

[0041] Determine, according to an equivalent circuit model corresponding to the lithium-ion battery, a first expression corresponding to a charging time required to charge the lithium-ion battery from a first state of charge to a second state of charge using a first current value; the first current value is related to the battery temperature; the first expression is used to establish an association relationship between the charging time, the state of charge, and the first charging current;

[0042] Determine, according to a thermal model corresponding to the lithium-ion battery, a second expression corresponding to the battery temperature in a process of charging the lithium-ion battery from the first state of charge to the second state of charge using a first current value; the second expression is used to establish a correlation relationship between the charging time, the first current value, and the battery temperature;

[0043] The first expression and the second expression are determined as a charging time calculation model.

[0044] In order to solve the above technical problems, an embodiment of the present invention further provides a device for determining a charging path of a lithium-ion battery, the device comprising:

[0045] A processing module, used for discretizing the charging interval formed by the initial state of charge of the lithium-ion battery and the target state of charge at the end of charging, to obtain n discrete states of charge including the initial state of charge and the target state of charge; n is an integer greater than 2;

[0046] A first determination module is used to determine a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation relationship between the charging time, battery temperature and state of charge of the lithium-ion battery;

[0047] A second determination module, configured to determine at least two preset battery temperatures corresponding to the discrete state of charge;

[0048] a third determination module, configured to determine, according to an i-th discrete state of charge, an i-1th discrete state of charge and a preset battery temperature corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge using the charging time calculation model; i is an integer greater than 0 and less than or equal to n;

[0049] The fourth determination module is used to determine a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration.

[0050] In order to solve the above technical problems, an embodiment of the present invention further provides a vehicle, the vehicle includes a lithium-ion battery and an electronic device, the electronic device includes a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory communicate with each other through the communication bus;

[0051] Memory, used to store computer programs;

[0052] The processor is used to implement the steps in the method for determining the charging path of the lithium-ion battery as described above when executing the program stored in the memory.

[0053] In order to solve the above technical problems, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, characterized in that when the program is executed by a processor, the steps in the method for determining a charging path of a lithium-ion battery as described above are implemented.

[0054] The present invention has the following advantages:

[0055] The method for determining a charging path of a lithium-ion battery provided by an embodiment of the present invention discretizes a charging interval consisting of an initial state of charge of a lithium-ion battery and a target state of charge at a charging cutoff to obtain n discrete states of charge in the process of determining a target charging path; and according to preset battery temperatures corresponding to an i-th discrete state of charge, an i-1th discrete state of charge and an i-th discrete state of charge, sequentially determines a target charging time corresponding to each discrete state of charge other than the initial state of charge by using a charging time calculation model that establishes a correlation between the charging time, the battery temperature and the state of charge of the lithium-ion battery. In the process of determining the target charging time, while ensuring the safety of the lithium-ion battery, the influence of the battery temperature on the charging time is also considered, so that the target charging path determined according to the target charging time takes into account the problem of extending the charging time caused by the battery temperature of the lithium-ion battery and the safety problem caused by lithium deposition of the lithium-ion battery. Charging the lithium-ion battery based on the target charging path determined by the embodiment of the present invention can shorten the charging time of the lithium-ion battery and improve the efficiency of charging the lithium-ion battery.

[0056] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 A flowchart of a method for determining a charging path of a lithium-ion battery provided by an embodiment of the present invention;

[0059] Figure 2 A schematic diagram of an equivalent circuit corresponding to a lithium-ion battery provided in an embodiment of the present invention;

[0060] Figure 3 A logic block diagram of a device for determining a charging path of a lithium-ion battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0062] Method Embodiment

[0063] Figure 1 is a flow chart of the steps of a method for determining a charging path of a lithium-ion battery provided by an embodiment of the present invention, such as Figure 1 As shown, the method may include steps S101 to S105:

[0064] Step S101, discretizing a charging interval consisting of an initial state of charge of a lithium-ion battery and a target state of charge at a charging cutoff, to obtain n discrete states of charge including the initial state of charge and the target state of charge.

[0065] Here, n is an integer greater than 2.

[0066] The method for determining the charging path of a lithium-ion battery provided in the embodiment of the present invention can be applied to any electronic device with a data processing function, and the electronic device establishes a communication connection with a monitoring device corresponding to the lithium-ion battery, and can obtain the operating status information of the lithium-ion battery through the monitoring device, and the operating status information may include but is not limited to the battery temperature and charge state of the lithium-ion battery. In the embodiment of the present invention, the electronic device may include but is not limited to a smart terminal, a computer, a personal digital assistant, a tablet computer, a vehicle-mounted device, etc.

[0067] The lithium-ion battery may be a lithium-ion power battery for new energy vehicles, and the new energy vehicles may include but are not limited to extended-range vehicles, hybrid electric vehicles (Plug in Hybrid Electric Vehicle, PHEV), electric vehicles (Electric Vehicle, EV), etc.

[0068] It is understood that the initial state of charge is the state of charge of the lithium-ion battery at the beginning of charging; the target state of charge is the state of charge of the lithium-ion battery at the end of charging, and the target state of charge is greater than the initial state of charge. In an embodiment of the present invention, the target state of charge can be a state of charge set manually, such as 80% SOC, 90% SOC, etc.; of course, if the target state of charge is not set manually, the electronic device can default to 100% SOC as the target state of charge.

[0069] Specifically, the initial state of charge can be recorded as SOC0, and the target state of charge can be recorded as SOC n , then the charging interval composed of the initial state of charge and the target state of charge of the lithium-ion battery can be expressed as [SOC0, SOC n ]; Discretization of the charging interval formed by the initial state of charge and the target state of charge may be specifically as follows:

[0070] In the charging interval [SOC0, SOC n ], n discrete states of charge including the initial state of charge and the target state of charge are selected, and each discrete state of charge can be expressed as SOC i , and obtain at least two charging sub-intervals [SOC0, ..., SOC i , ......., SOC n ]; wherein i is an integer greater than 0 and less than or equal to n.

[0071] In the embodiment of the present invention, the lengths of the various charging sub-intervals are equal, that is, SOC n -SOC n-1 =SOC i -SOC i-1 =SOC1-SOC0, and SOC0≤SOC i ≤SOC n .

[0072] Step S102: determining a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation between the charging time, battery temperature and state of charge of the lithium-ion battery.

[0073] Among them, the equivalent circuit model corresponding to the lithium-ion battery is a first-order RC equivalent circuit model. The RC equivalent circuit model is a simple circuit composed of a resistor (R) and a capacitor (C), which is used to simulate and analyze the behavior of the circuit under the action of an AC signal.

[0074] Reference Figure 2 , shows a schematic diagram of an equivalent circuit corresponding to a lithium-ion battery provided in an embodiment of the present invention, the equivalent circuit includes a terminal voltage U, an open circuit voltage U ocv 、Ohmic internal resistance R o , Polarization internal resistance R p and polarization capacitance C p ; The polarization internal resistance and polarization capacitance are connected in parallel to form a parallel structure, and the terminal voltage U and the open circuit voltage U ocv 、Ohmic internal resistance R o And the parallel structure consisting of polarized internal resistance and polarized capacitance is connected in series.

[0075] according to Figure 2 The equivalent circuit diagram shown in the figure can describe the terminal voltage as follows:

[0076] U(t)=U ocv (t)-IR o -U p (t) (1)

[0077] Where, U represents the terminal voltage; U ocv represents the open circuit voltage; I represents the charging current through the equivalent circuit; R o Indicates ohmic internal resistance; U p represents the parallel voltage of polarization internal resistance and polarization capacitance; t represents the charging time.

[0078] According to formula 1 and Figure 2 The equivalent circuit diagram shown in the figure can be used to calculate the parallel voltage U of the polarization internal resistance and polarization capacitance. p It is expressed as the following formula:

[0079]

[0080] in, Represents polarization voltage; R p represents polarization internal resistance; C represents polarization capacitance.

[0081] In addition, the state of charge of a lithium-ion battery can be expressed by the following formula:

[0082]

[0083] Among them, SOC(t) represents the real-time state of charge of the lithium-ion battery during the charging process; SOC0 represents the initial state of charge of the lithium-ion battery; C bat represents the battery capacity of the lithium-ion battery; i represents the real-time charging current of the lithium-ion battery.

[0084] In the embodiment of the present invention, the above formulas 1 to 3 may be determined as equivalent circuit models corresponding to lithium-ion batteries.

[0085] The thermal model of lithium-ion batteries can be expressed by the following formula:

[0086]

[0087] Where m represents the battery mass of the lithium-ion battery; C P represents the specific heat capacity of the lithium-ion battery; T represents the battery temperature of the lithium-ion battery; Tf represents the temperature of the fluid used to cool the lithium-ion battery; represents the entropy thermal coefficient; h represents the heat transfer coefficient; A represents the surface area of ​​the lithium-ion battery.

[0088] In the embodiment of the present invention, according to the equivalent circuit model corresponding to the lithium-ion battery (Formula 1 to Formula

[0089] Formula 3) and thermal model (Formula 4), the charging time calculation model can be expressed as:

[0090]

[0091]

[0092] Among them, SOC i Represents the i-th discrete state of charge of a lithium-ion battery; SOC i -1 represents the i-1th discrete state of charge of the lithium-ion battery; T i represents the battery temperature corresponding to the ith discrete state of charge; T i-1 Indicates the battery temperature corresponding to the i-1th discrete state of charge.

[0093] In an embodiment of the present invention, a charging time calculation model can be used to establish a correlation between the charging time, battery temperature and state of charge of a lithium-ion battery, so that step S104 uses the charging time calculation model to determine the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge.

[0094] Step S103: determining a battery temperature change value corresponding to the charging sub-interval.

[0095] The battery temperature of the lithium-ion battery can be expressed as T.

[0096] Referring to Table 1, a charging current map of a lithium-ion battery provided by an embodiment of the present invention is shown. In the embodiment of the present invention, the battery temperature T of the lithium-ion battery is greater than -20°C and less than 55°C, that is, when the battery temperature of the lithium-ion battery satisfies the condition of being greater than -20°C and less than 55°C, the target charging path can be determined by the method for determining the charging path of a lithium-ion battery provided by an embodiment of the present invention.

[0097] Table 1

[0098]

[0099]

[0100] Among them, the unit of voltage in Table 1 is volt (V); the unit of rate is C, which represents the charge and discharge capacity and charge and discharge speed of the lithium-ion battery, and its value is equal to the battery capacity divided by the charge and discharge time.

[0101] In the embodiment of the present invention, the battery temperature change value can be set according to the accuracy requirement of the target charging path, and the temperature range (-20°C, 55°C) consisting of -20°C and 55°C can be discretized according to the battery temperature change value to obtain at least two preset battery temperatures corresponding to each discrete state of charge. The preset charging temperature can be expressed as T i , T i Greater than -20℃ and less than 55℃.

[0102] Exemplarily, the battery temperature change value is 0.05° C., then the at least two preset battery temperatures corresponding to the discrete charge states are (-20° C., -19.95° C., -19.90° C., ..., 54.90° C., 54.95° C., 55° C.).

[0103] It should be noted that, in the embodiment of the present invention, the preset battery temperatures corresponding to the discrete states of charge are the same.

[0104] It can be understood that the smaller the battery temperature change value, the more accurate the target charging path determined by the lithium-ion battery charging path determination method provided by the embodiment of the present invention, but the amount of calculation to determine the target charging path increases accordingly. In actual application scenarios, the value of the battery temperature change value can be determined according to the accuracy requirement of the target charging path, and the embodiment of the present invention does not make specific limitations on this.

[0105] Referring to Table 2, a correspondence table between discrete charge states and preset battery temperatures provided by an embodiment of the present invention is shown.

[0106] Table 2

[0107] <![CDATA[SOC0]]> <![CDATA[SOC1]]> <![CDATA[SOC2]]> …… <![CDATA[SOC i -1]]> <![CDATA[SOC i ]]> …… …… <![CDATA[SOC n-1 ]]> <![CDATA[SOC n ]]> …… <![CDATA[(SOC1,T1)]]> <![CDATA[(SOC2,T1)]]> …… …… <![CDATA[(SOC i ,T1)]]> …… …… <![CDATA[(SOC n-1 ,T1)]]> <![CDATA[(SOC n ,T1)]]> …… <![CDATA[(SOC1,T2)]]> <![CDATA[(SOC2,T2)]]> …… …… <![CDATA[(SOC i ,T2)]]> …… …… <![CDATA[(SOC n-1 ,T2)]]> <![CDATA[(SOC n ,T2)]]> …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… <![CDATA[(SOC0,T0)]]> <![CDATA[(SOC1,T i )]]> <![CDATA[(SOC2,T i )]]> …… …… <![CDATA[(SOC i ,T i )]]> …… …… <![CDATA[(SOC n-1 ,T i )]]> <![CDATA[(SOC n ,T i )]]> …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… …… <![CDATA[(SOC1,T n-1 )]]> <![CDATA[(SOC2,T m-1 )]]> …… …… <![CDATA[(SOC i ,T m-1 )]]> …… …… <![CDATA[(SOC n-1 ,T m-1 )]]> <![CDATA[(SOC n ,T m-1 )]]> …… <![CDATA[(SOC1,T n )]]> <![CDATA[(SOC2,T m )]]> …… …… <![CDATA[(SOC i ,T m )]]> …… …… <![CDATA[(SOC n-1 ,T m )]]> <![CDATA[(SOC n ,T m )]]>

[0108] Among them, m in Table 2 represents the total number of preset battery temperatures corresponding to each discrete state of charge, and m is an integer greater than or equal to 2.

[0109] Step S104: according to the i-th discrete state of charge, the i-1th discrete state of charge and the preset battery temperature corresponding to the i-th discrete state of charge, using the charging duration calculation model, determine the target charging duration required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge.

[0110] It can be understood that the i-1th discrete state of charge can be any discrete state of charge other than the target state of charge, and the i-th discrete state of charge can be any discrete state of charge other than the initial state of charge; the i-th discrete state of charge is greater than the i-1th discrete state of charge, and the i-th discrete state of charge is a discrete state of charge adjacent to the i-1th discrete state of charge.

[0111] Specifically, the electronic device can first determine the first target charging time required to charge the lithium-ion battery from SOC0 to SOC1 using a charging time calculation model based on the first discrete state of charge (SOC1), the initial state of charge (SOC0) and the preset battery temperature corresponding to SOC1.

[0112] Then, according to the second discrete state of charge (SOC2), the first discrete state of charge (SOC1) and the preset battery temperature corresponding to SOC2, a second target charging time required to charge the lithium-ion battery from SOC1 to SOC2 is determined using a charging time calculation model.

[0113] Then, according to the third discrete state of charge (SOC3), the second discrete state of charge (SOC2) and the preset battery temperature corresponding to SOC3, the charging time calculation model is used to determine the third target charging time required to charge the lithium-ion battery from SOC2 to SOC3.

[0114] …

[0115] Then, according to the target state of charge (SOC n ), the n-1th discrete state of charge (SOC n-1 ) and SOC n The corresponding preset battery temperature is used to calculate the charging time and determine the time to charge the lithium-ion battery from SOC n-1 Charge to SOC n The required charging time for the nth target.

[0116] In the embodiment of the present invention, the target charging time includes a first target charging time, a second target charging time, a third target charging time, ..., and an nth target charging time.

[0117] In addition, in the embodiment of the present invention, the ohmic internal resistance, polarization internal resistance and polarization capacitance in Formula 6 will change with the aging of the lithium-ion battery. In the embodiment of the present invention, the ohmic internal resistance, polarization internal resistance and polarization capacitance can be used as variables reflecting the aging state of the lithium-ion battery, denoted as R o =f1(SOH, SOC, T), R P =f1(SOH, SOC, T), C=f3(SOH, SOC, T), where SOH represents the health state of the lithium-ion battery.

[0118] In an embodiment of the present invention, the electronic device can obtain the ohmic internal resistance, polarization internal resistance and polarization capacitance in real time through the monitoring device corresponding to the lithium-ion battery during the execution of steps S101 to S105, so as to calculate the determination of the target charging path based on the different aging states of the lithium-ion battery, so that the target charging path is more in line with the actual operating state of the lithium-ion battery, thereby improving the accuracy and reliability of the target charging path; it can ensure that when the user uses it throughout the life cycle, the target charging path is the optimal charging path of the lithium-ion battery, and the corresponding charging time of the target charging path is the optimal charging time of the lithium-ion battery.

[0119] Step S105: Determine a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration.

[0120] Specifically, the electronic device can first determine the charging sub-path for charging the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge according to the target charging time corresponding to the (i)th discrete state of charge; then, in order of the discrete states of charge from small to large, the charging sub-paths corresponding to each discrete state of charge are combined to obtain the target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge.

[0121] The total charging time corresponding to the target charging path is the sum of the target charging times corresponding to the discrete states of charge. The charging subpath for charging the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge includes a charging current for charging the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge, and the charging current is a charging current corresponding to the target charging time that is synchronously calculated in the process of determining the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge using a charging time calculation model.

[0122] In summary, the method for determining the charging path of a lithium-ion battery provided by an embodiment of the present invention, in the process of determining the target charging path, discretizes the charging interval formed by the initial state of charge of the lithium-ion battery and the target state of charge at the end of charging, and obtains n discrete states of charge; according to the preset battery temperatures corresponding to the i-th discrete state of charge, the i-1-th discrete state of charge and the i-th discrete state of charge, a charging time calculation model that establishes a correlation between the charging time, the battery temperature and the state of charge of the lithium-ion battery is used to sequentially determine the target charging time corresponding to each discrete state of charge other than the initial state of charge; in the process of determining the target charging time, while ensuring the safety of the lithium-ion battery, the influence of the battery temperature on the charging time is also considered, so that the target charging path determined according to the target charging time takes into account the problem of extended charging time caused by the battery temperature of the lithium-ion battery and the safety problem caused by lithium deposition of the lithium-ion battery; charging the lithium-ion battery based on the target charging path determined by the embodiment of the present invention can shorten the charging time of the lithium-ion battery and improve the efficiency of charging the lithium-ion battery.

[0123] The method for determining the charging path of a lithium-ion battery provided in an embodiment of the present invention can be applied to fast charging scenarios (lithium-ion battery systems with a charging current of 2C or above), and the greater the charging current, the more obvious the optimization effect of the embodiment of the present invention on the charging path.

[0124] Optionally, the step S104, according to the i-th discrete state of charge, the i-1th discrete state of charge and the preset battery temperature corresponding to the i-th discrete state of charge, using the charging duration calculation model, determines the target charging duration required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge, including steps S1041 to S1044:

[0125] Step S1041: Determine a first difference between the ith discrete state of charge and the (i-1)th discrete state of charge.

[0126] Step S1042: Acquire a first battery temperature corresponding to the (i-1)th discrete state of charge, and determine a second difference between a preset battery temperature corresponding to the (i)th discrete state of charge and the first battery temperature.

[0127] Step S1043: Calculate, based on the first difference, the second difference and the preset battery temperature, a first charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge at the preset battery temperature using the charging time calculation model.

[0128] Step S1044: determining a target charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge according to the first charging time corresponding to each of the preset battery temperatures corresponding to the (i)th discrete state of charge.

[0129] In an embodiment of the present invention, in the process of determining the target charging time required to charge a lithium-ion battery from an i-1th discrete state of charge to an i-th discrete state of charge, the electronic device may first determine a first difference between the i-th discrete state of charge and the i-1th discrete state of charge, and a second difference between a preset battery temperature corresponding to the i-th discrete state of charge and a first battery temperature corresponding to the i-1th discrete state of charge; then, based on the first difference, the second difference and the preset battery temperature, using a charging time calculation model, calculate the first charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge at each preset battery temperature corresponding to the i-th discrete state of charge; finally, based on the first charging time corresponding to each preset battery temperature corresponding to the i-th discrete state of charge, determine the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge.

[0130] It can be understood that the number of first charging times calculated by step S1043 is the same as the number of preset battery temperatures corresponding to the i-th discrete state of charge; the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge is the first charging time corresponding to any preset battery temperature among the preset battery temperatures corresponding to the i-th discrete state of charge.

[0131] Specifically, when the i-1th discrete state of charge is the initial state of charge, the first battery temperature is the battery temperature obtained by the electronic device through the detection device corresponding to the lithium-ion battery; when the i-1th discrete state of charge is a discrete state of charge other than the initial state of charge, the first battery temperature corresponding to the i-1th discrete state of charge is the preset battery temperature corresponding to the target charging time required to charge the lithium-ion battery from the i-2th discrete state of charge to the i-1th discrete state of charge.

[0132] It can be understood that the target charging time corresponding to the ith discrete state of charge is determined when the target charging time corresponding to the (i-1)th discrete state of charge is determined.

[0133] When the first difference is determined and the second difference is obtained, the electronic device can solve the charging time calculation model shown in Formulas 5 to 6 according to the first difference, the second difference and the preset battery temperature, and obtain the first charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge at the preset battery temperature, and the charging current required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge at the preset battery temperature.

[0134] The method for determining a charging path of a lithium-ion battery provided in an embodiment of the present invention solves a charging time calculation model according to a first difference between an i-th discrete state of charge and an i-1th discrete state of charge, a second difference between a preset battery temperature corresponding to the i-th discrete state of charge and a first battery temperature corresponding to the i-1th discrete state of charge, and a preset battery temperature corresponding to the i-th discrete state of charge, so as to determine a first charging time required to charge the lithium-ion battery from an i-1th discrete state of charge to an i-th discrete state of charge at a preset battery temperature, and determines a target charging time required to charge the lithium-ion battery from an i-1th discrete state of charge to an i-th discrete state of charge from the first charging time corresponding to each preset battery temperature, wherein calculation parameters for determining the target charging time are easy to obtain and the calculation process is simple, thereby simplifying the calculation process for determining the target charging time and improving the efficiency of determining the target charging time.

[0135] Optionally, the step S1044 determines the target charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge according to the first charging time corresponding to each of the preset battery temperatures corresponding to the (i)th discrete state of charge, including steps A11 to A13:

[0136] Step A11: determine the minimum charging time in the first charging time corresponding to each of the preset battery temperatures to obtain a second charging time.

[0137] Step A12: when the number of the second charging duration is 1, determine the second charging duration as the target charging duration.

[0138] Step A13: When the number of the second charging times is greater than 1, determine the preset charging temperature corresponding to each of the second charging times, and determine the target charging time from the second charging times according to the preset charging temperatures corresponding to the second charging times.

[0139] In an embodiment of the present invention, in the process of determining the target charging time required to charge a lithium-ion battery from an i-1th discrete state of charge to an i-th discrete state of charge based on the first charging time corresponding to each preset battery temperature corresponding to the i-th discrete state of charge, the electronic device can determine the target charging time from the first charging time corresponding to each preset battery temperature based on the size of the first charging time or the size of the preset charging temperature.

[0140] Specifically, the electronic device first compares the first charging times of each preset battery temperature corresponding to the i-th discrete state of charge, determines the minimum value from each first time period, and determines the minimum value among the first time periods as the second charging time period; it can be understood that the second charging time period is determined from each first charging time period, and the number of second charging time periods is greater than 0 and less than or equal to the number of preset battery temperatures corresponding to the i-th discrete state of charge.

[0141] When the number of the second charging duration obtained in step A11 is 1, the electronic device can directly determine the second charging duration as the target charging duration required to charge the lithium-ion battery from the i-1th discrete state of charge to the ith discrete state of charge.

[0142] In the case where the number of second charging durations obtained in step A11 is greater than 1, the electronic device may first determine the preset charging temperature corresponding to each second charging duration, and determine the target charging duration from the second charging durations according to the preset charging temperature corresponding to the second charging duration. It should be noted that, in the case where the number of second charging durations is greater than 1, the second durations are the same, but the preset battery temperature and / or charging current corresponding to each second duration is different.

[0143] Optionally, the step A13 of determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes step A131 or step A132:

[0144] Step A131: Determine the second charging time corresponding to the maximum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time.

[0145] Step A132: Determine the second charging time corresponding to the minimum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time.

[0146] In an embodiment of the present invention, based on the scenario of charging the lithium-ion battery and energy consumption considerations, when the number of the second charging duration is greater than 1, the target charging duration can be determined through step A131 or step A132.

[0147] Specifically, if the thermal management energy consumption during charging is considered, in order to reduce the external energy consumption caused by the charging process of the lithium-ion battery, then in the low-temperature fast charging scenario, step A132 can be executed to determine the second charging time corresponding to the minimum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time; in the high-temperature fast charging scenario, step A131 can be executed to determine the second charging time corresponding to the maximum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time.

[0148] It should be noted that thermal management energy consumption refers to: in order to meet the time requirements of fast charging, an external heat source is required to heat the lithium-ion battery in the low-temperature fast charging scenario, and coolant is required to cool the lithium-ion battery in the high-temperature fast charging scenario.

[0149] If the principle of minimum vehicle-side energy consumption is considered when driving after fast charging, then in the low-temperature fast charging scenario, execute step A131 to determine the second charging time corresponding to the maximum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time; in the high-temperature fast charging scenario, execute step A132 to determine the second charging time corresponding to the minimum temperature among the preset charging temperatures corresponding to the second charging time as the target charging time.

[0150] It should be noted that when driving after fast charging, the principle of minimum energy consumption on the vehicle side means: driving after charging is completed. At this time, the lithium-ion battery serves as the power source of the vehicle, and whether the lithium-ion battery is heated or cooled, it will consume the power of the lithium-ion battery.

[0151] Optionally, the step A13 of determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes step A133 or step A136:

[0152] Step A133: determine a first temperature range consisting of a maximum temperature and a minimum temperature among the preset charging temperatures corresponding to the second charging duration.

[0153] Step A134: determine the intersection of the first temperature range and the target temperature range.

[0154] Step A135: Determine the second charging time corresponding to the minimum temperature in the intersection as the target charging time.

[0155] Step A136: Determine the second charging duration corresponding to the maximum temperature in the intersection as the target charging duration.

[0156] In an embodiment of the present invention, based on the scenario of charging the lithium-ion battery and the battery life of the lithium-ion battery, when the second charging time is greater than 1, the electronic device can determine the target charging time through step A133 or step A136.

[0157] Specifically, when the number of the second charging durations is greater than 1, the electronic device may first determine the maximum temperature (T max ) and minimum temperature (T min ), and the temperature interval consisting of the maximum temperature and the minimum temperature is determined as the first temperature interval [T min, T max ]; then, determine the intersection of the first temperature range and the target temperature range; finally, according to the size relationship between the preset charging temperatures in the intersection and the specific application scenario, execute step A135 or step A136 to determine the target charging time.

[0158] In the low-temperature fast charging scenario, execute step A136 to determine the second charging time corresponding to the maximum temperature in the intersection as the target charging time; in the high-temperature fast charging scenario, execute step A135 to determine the second charging time corresponding to the minimum temperature in the intersection as the target charging time.

[0159] The target temperature range is a temperature range consisting of battery temperatures that is beneficial to extending the service life of the lithium-ion battery.

[0160] For example, the target temperature interval may be 15°C to 35°C, and the target temperature interval may be expressed as [15°C, 35°C]; the intersection of the first temperature interval and the target temperature interval may be expressed as [15°C, 35°C]∩[T min, T max ]; In the low temperature fast charging scenario, max{[15℃,35℃]∩[T min, T max ]} is determined as the target charging time; in the high temperature fast charging scenario, min{[15℃,35℃]∩[T min , T max ]}The second charging time corresponding to the value is determined as the target charging time.

[0161] The method for determining a charging path for a lithium-ion battery provided in an embodiment of the present invention takes into account the influence of energy consumption, battery life, application scenarios, etc. on the charging process in the process of determining a target charging time, thereby improving the degree of matching between the target charging time determined by the embodiment of the present invention and the application scenarios and usage requirements of the lithium-ion battery, thereby improving the accuracy and reliability of the target charging path determined based on the target charging time.

[0162] Exemplarily, the process of the electronic device determining the charging path can be expressed by the following formula:

[0163] First, in the process of determining the first target charging time required to charge the lithium-ion battery from SOC0 to SOC1, formula 5 and formula 6 are combined to obtain:

[0164]

[0165]

[0166] By using formula 7 and formula 8, it can be calculated that at the preset battery temperature T i The first charging time required to charge a lithium-ion battery from SOC0 to SOC1 Through step S1044, the first charging time corresponding to each preset battery temperature is Determine the first target charging time required to charge the lithium-ion battery from SOC0 to SOC1 in, Charging current 0≤I≤I max , I max To check the charging current map to obtain the maximum charging current corresponding to the preset battery temperature.

[0167] Then, in the process of determining the target charging time required to charge the lithium-ion battery from SOC0 to SOC2, the target charging time required to charge the lithium-ion battery from SOC0 to SOC2 can be expressed as:

[0168]

[0169] in, Indicates the target charging time required to charge a lithium-ion battery from SOC0 to SOC2; It represents the second target charging time required to charge the lithium-ion battery from SOC1 to SOC2.

[0170] …

[0171] Finally, after determining the charging time of the lithium-ion battery from SOC0 to SOC n During the required target charging time, the lithium-ion battery is charged from SOC0 to SOC n The required target charging time can be expressed as:

[0172]

[0173] in, Indicates charging the lithium-ion battery from SOC0 to SOC n The target charging time required; Indicates charging the lithium-ion battery from SOC0 to SOC n-1 The target charging time required; Indicates that lithium-ion batteries are converted from SOC n-1 Charge to SOC n The required charging time for the nth target.

[0174] Optionally, after determining a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration in step S105, the method may further include steps S106 to S107:

[0175] Step S106: charging the lithium-ion battery based on the target charging path.

[0176] Step S107: Synchronously output the remaining charging time according to the target charging path.

[0177] Wherein, during the process of charging the lithium-ion battery, the remaining charging time is synchronously output according to the target charging path.

[0178] Specifically, the electronic device may include a display device, and the electronic device may output the remaining charging time through the display device during the process of charging the lithium-ion battery based on the target charging path. Of course, the electronic device may also establish a communication connection with other electronic devices including a display device, and output the remaining charging time through the other electronic devices including a display device during the process of charging the lithium-ion battery based on the target charging path.

[0179] It can be understood that the electronic device outputs the remaining charging time in real time during the entire process of charging the lithium-ion battery from the initial state of charge to the target state of charge based on the target charging path, which is conducive to improving the visualization of the charging process and thereby improving the human-computer interaction and intelligence of the embodiments of the present invention.

[0180] Optionally, step S107 synchronously outputs the remaining charging time according to the target charging path, including steps S1071 to S1073:

[0181] Step S1071, obtaining the current real-time battery temperature and real-time state of charge of the lithium-ion battery.

[0182] Step S1072: Determine the target charging time required to charge the lithium-ion battery from the real-time state of charge to the target state of charge using the charging time calculation model according to the real-time state of charge, the target state of charge and the preset battery temperature corresponding to the target state of charge.

[0183] Step S1073: determine the target charging time as the remaining charging time, and synchronously output the remaining charging time.

[0184] In an embodiment of the present invention, when the electronic device synchronously outputs the remaining charging time according to the target charging path, it can first obtain the current real-time battery temperature and real-time state of charge of the lithium-ion battery through the monitoring device corresponding to the lithium-ion battery; then, according to the real-time state of charge, the target state of charge and the preset battery temperature corresponding to the target state of charge, using the charging time calculation model, determine the target charging time required to charge the lithium-ion battery from the real-time state of charge to the target state of charge in a method similar to step S104; finally, determine the target charging time as the remaining charging time, and synchronously output the remaining charging time.

[0185] In the process of determining the remaining charging time in the embodiment of the present invention, taking into account the differences in the control accuracy of the charging process between the charging pile and the whole vehicle in the actual charging scenario, on the basis of the target charging path determined in the above steps S101 to S105, the remaining charging time is recalculated and determined according to the current real-time battery temperature and real-time state of charge of the lithium-ion battery acquired in real time, thereby improving the accuracy of the remaining charging time output synchronously.

[0186] Optionally, step S107 synchronously outputs the remaining charging time according to the target charging path, including steps S1074 to S1076:

[0187] Step S1074: Determine the total charging time corresponding to the target charging path.

[0188] Step S1075: Obtain a third charging time for charging the lithium-ion battery.

[0189] Step S1076: determine the third difference between the total charging time and the third charging time as the remaining charging time, and synchronously output the remaining charging time.

[0190] In an embodiment of the present invention, when the electronic device synchronously outputs the remaining charging time according to the target charging path, it can first determine the total charging time corresponding to the target charging path, that is, determine the sum of the target charging times corresponding to each discrete state of charge as the total charging time; then, obtain in real time a third charging time for charging the lithium-ion battery based on the target charging path; then, calculate the third difference between the total charging time and the third charging time; finally, determine the third difference as the remaining charging time, and synchronously output the remaining charging time.

[0191] In the process of determining the remaining charging time in the embodiment of the present invention, the third difference between the total charging time corresponding to the target charging path and the third charging time for charging the lithium-ion battery is determined as the remaining charging time, and the remaining charging time is output synchronously, which simplifies the calculation process of determining the remaining charging time and improves the efficiency of outputting the remaining charging time.

[0192] Optionally, the step S102 of determining a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery includes steps S1021 to S1023:

[0193] Step S1021: Determine, according to an equivalent circuit model corresponding to the lithium-ion battery, a first expression corresponding to a charging time required to charge the lithium-ion battery from a first state of charge to a second state of charge using a first current value; the first current value is related to the battery temperature.

[0194] The first expression is used to establish an association relationship between the charging duration, the state of charge and the first charging current.

[0195] The first state of charge and the second state of charge are different states of charge in the discrete states of charge obtained in step S101 , and the second state of charge is greater than the first state of charge.

[0196] Specifically, the first expression may be the above formula 5.

[0197] Step S1022: Determine, according to a thermal model corresponding to the lithium-ion battery, a second expression corresponding to the battery temperature during a process of charging the lithium-ion battery from the first state of charge to the second state of charge using a first current value.

[0198] The second expression is used to establish a correlation relationship among the charging duration, the first current value and the battery temperature.

[0199] Specifically, the second expression may be the above formula 6.

[0200] Step S1023: determine the first expression and the second expression as a charging time calculation model.

[0201] The method for determining the charging path of a lithium-ion battery provided by the embodiment of the present invention improves the feasibility of the process of determining the charging time calculation model.

[0202] In summary, the method for determining the charging path of a lithium-ion battery provided in an embodiment of the present invention, in the process of determining the target charging time, not only ensures the safety of the lithium-ion battery, but also takes into account the influence of the battery temperature on the charging time, so that the target charging path determined according to the target charging time takes into account both the problem of extended charging time caused by the battery temperature of the lithium-ion battery and the safety problem caused by lithium deposition of the lithium-ion battery. Charging the lithium-ion battery based on the target charging path determined in the embodiment of the present invention can shorten the charging time of the lithium-ion battery and improve the efficiency of charging the lithium-ion battery.

[0203] Device Embodiment

[0204] Figure 3 : is a logic block diagram of a device for determining a charging path of a lithium-ion battery provided by an embodiment of the present invention, the device comprising:

[0205] The processing module 301 is used to discretize the charging interval formed by the initial state of charge of the lithium-ion battery and the target state of charge at the end of charging, and obtain n discrete states of charge including the initial state of charge and the target state of charge; n is an integer greater than 2;

[0206] A first determination module 302 is used to determine a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation relationship between the charging time, battery temperature and state of charge of the lithium-ion battery;

[0207] A second determination module 303, configured to determine at least two preset battery temperatures corresponding to the discrete state of charge;

[0208] a third determining module 304, configured to determine, according to an i-th discrete state of charge, an i-1th discrete state of charge and a preset battery temperature corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge using the charging time calculation model; i is an integer greater than 0 and less than or equal to n;

[0209] The fourth determining module 305 is configured to determine a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration.

[0210] Optionally, the third determining module includes:

[0211] A first determination submodule, configured to determine a first difference between an i-th discrete state of charge and an (i-1)-th discrete state of charge;

[0212] a first acquisition submodule, configured to acquire a first battery temperature corresponding to the (i-1)th discrete state of charge, and determine a second difference between a preset battery temperature corresponding to the (i)th discrete state of charge and the first battery temperature;

[0213] a calculation submodule, configured to calculate, according to the first difference, the second difference and the preset battery temperature, a first charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge at the preset battery temperature using the charging time calculation model;

[0214] The second determination submodule is used to determine the target charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge according to the first charging time corresponding to each of the preset battery temperatures corresponding to the (i)th discrete state of charge.

[0215] Optionally, the second determining submodule includes:

[0216] A first determining unit, configured to determine a minimum charging time among the first charging time corresponding to each of the preset battery temperatures, to obtain a second charging time;

[0217] a second determining unit, configured to determine the second charging duration as a target charging duration when the number of the second charging duration is 1;

[0218] The third determination unit is used to determine the preset charging temperature corresponding to each of the second charging times when the number of the second charging times is greater than 1, and determine the target charging time from the second charging times according to the preset charging temperatures corresponding to the second charging times.

[0219] Optionally, the third determining unit includes:

[0220] A first determining subunit is configured to determine a second charging time corresponding to a maximum temperature among preset charging temperatures corresponding to the second charging time as a target charging time; or

[0221] The second determining subunit is used to determine a second charging time corresponding to a minimum temperature among the preset charging temperatures corresponding to the second charging time as a target charging time.

[0222] Optionally, the third determining unit includes:

[0223] a third determining subunit, configured to determine a first temperature interval consisting of a maximum temperature and a minimum temperature among the preset charging temperatures corresponding to the second charging duration;

[0224] a fourth determining subunit, configured to determine an intersection of the first temperature interval and a target temperature interval;

[0225] a fifth determining subunit, configured to determine a second charging duration corresponding to the minimum temperature in the intersection as a target charging duration; or

[0226] The sixth determining subunit is used to determine the second charging duration corresponding to the maximum temperature in the intersection as the target charging duration.

[0227] Optionally, the device further comprises:

[0228] A charging module, used for charging the lithium-ion battery based on the target charging path;

[0229] The output module is used to synchronously output the remaining charging time according to the target charging path.

[0230] Optionally, the output module includes:

[0231] The second acquisition submodule is used to obtain the current real-time battery temperature and real-time state of charge of the lithium-ion battery;

[0232] A third determination submodule is used to determine the target charging time required to charge the lithium-ion battery from the real-time state of charge to the target state of charge according to the real-time state of charge, the target state of charge and the preset battery temperature corresponding to the target state of charge, using the charging time calculation model;

[0233] The first output submodule is used to determine the target charging time as the remaining charging time and synchronously output the remaining charging time.

[0234] Optionally, the output module includes:

[0235] A fourth determination submodule, used to determine the total charging time corresponding to the target charging path;

[0236] A third acquisition submodule, used to acquire a third charging time for charging the lithium-ion battery;

[0237] The second output submodule is used to determine the third difference between the total charging time and the third charging time as the remaining charging time, and synchronously output the remaining charging time.

[0238] Optionally, the first determining module includes:

[0239] a fifth determination submodule, configured to determine, according to an equivalent circuit model corresponding to the lithium-ion battery, a first expression corresponding to a charging time required to charge the lithium-ion battery from a first state of charge to a second state of charge using a first current value; the first current value is related to the battery temperature; the first expression is used to establish an association relationship between the charging time, the state of charge, and the first charging current;

[0240] a sixth determination submodule, configured to determine, according to a thermal model corresponding to the lithium-ion battery, a second expression corresponding to the battery temperature in a process of charging the lithium-ion battery from the first state of charge to the second state of charge using a first current value; the second expression being configured to establish an association relationship between the charging duration, the first current value, and the battery temperature;

[0241] The seventh determination submodule is used to determine the first expression and the second expression as a charging time calculation model.

[0242] As for the above-mentioned device embodiment, since it is basically similar to the embodiment of the method for determining the charging path of a lithium-ion battery, the relevant parts may refer to the partial description of the method embodiment.

[0243] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0244] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0245] An embodiment of the present invention further provides a vehicle, the vehicle comprising an electronic device, the electronic device comprising: a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0246] Memory, used to store computer programs;

[0247] The processor is used to implement the steps in the method for determining the charging path of the lithium-ion battery as described above when executing the program stored in the memory.

[0248] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the method for determining a charging path of a lithium-ion battery as described above are implemented.

[0249] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk Solid State Disk (SSD)), etc.

[0250] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0251] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0252] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for determining a charging path of a lithium-ion battery, characterized in that: The method comprises: Discretization is performed on a charging interval consisting of an initial state of charge of the lithium-ion battery and a target state of charge at the end of charging to obtain n discrete states of charge including the initial state of charge and the target state of charge; n is an integer greater than 2; Determine a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation between the charging time, battery temperature and state of charge of the lithium-ion battery; determining at least two preset battery temperatures corresponding to the discrete states of charge; According to the i-th discrete state of charge, the i-1th discrete state of charge and the preset battery temperature corresponding to the i-th discrete state of charge, using the charging time calculation model, determining the target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge; i is an integer greater than 0 and less than or equal to n; A target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge is determined according to the target charging duration.

2. The method according to claim 1, characterized in that The method of determining a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge using the charging time calculation model according to the i-th discrete state of charge, the i-1th discrete state of charge, and a preset battery temperature corresponding to the i-th discrete state of charge, comprises: determining a first difference between an i-th discrete state of charge and an (i-1)th discrete state of charge; acquiring a first battery temperature corresponding to the (i-1)th discrete state of charge, and determining a second difference between a preset battery temperature corresponding to the (i)th discrete state of charge and the first battery temperature; Calculate, according to the first difference, the second difference and the preset battery temperature, a first charging time required to charge the lithium-ion battery from the (i-1)th discrete state of charge to the (i)th discrete state of charge at the preset battery temperature using the charging time calculation model; According to the first charging times corresponding to the preset battery temperatures corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge is determined.

3. The method according to claim 2, characterized in that The determining, according to the first charging times corresponding to the respective preset battery temperatures corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge comprises: Determine a minimum charging time among the first charging time corresponding to each of the preset battery temperatures to obtain a second charging time; When the number of the second charging duration is 1, determining the second charging duration as a target charging duration; When the number of the second charging durations is greater than 1, a preset charging temperature corresponding to each of the second charging durations is determined, and a target charging duration is determined from the second charging durations according to the preset charging temperatures corresponding to the second charging durations.

4. The method according to claim 3, characterized in that The determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes: determining a second charging time corresponding to a maximum temperature among preset charging temperatures corresponding to the second charging time as a target charging time; or A second charging time corresponding to a minimum temperature among the preset charging temperatures corresponding to the second charging time is determined as a target charging time.

5. The method according to claim 3, characterized in that: The determining the target charging duration from the second charging duration according to the preset charging temperature corresponding to the second charging duration includes: Determine a first temperature range consisting of a maximum temperature and a minimum temperature among the preset charging temperatures corresponding to the second charging duration; Determining the intersection of the first temperature range and the target temperature range; Determine the second charging time corresponding to the minimum temperature in the intersection as the target charging time; or, The second charging duration corresponding to the maximum temperature in the intersection is determined as the target charging duration.

6. The method according to claim 1, characterized in that After determining a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration, the method further includes: Based on the target charging path, charging the lithium-ion battery; According to the target charging path, the remaining charging time is synchronously output.

7. The method according to claim 6, characterized in that The synchronously outputting the remaining charging time according to the target charging path includes: Obtaining the current real-time battery temperature and real-time state of charge of the lithium-ion battery; Determine, according to the real-time state of charge, the target state of charge and a preset battery temperature corresponding to the target state of charge, a target charging time required to charge the lithium-ion battery from the real-time state of charge to the target state of charge using the charging time calculation model; The target charging time is determined as the remaining charging time, and the remaining charging time is synchronously output.

8. The method according to claim 6, characterized in that The synchronously outputting the remaining charging time according to the target charging path includes: Determine the total charging time corresponding to the target charging path; Obtaining a third charging duration for charging the lithium-ion battery; A third difference between the total charging time and the third charging time is determined as a remaining charging time, and the remaining charging time is synchronously output.

9. The method according to claim 1, characterized in that: Determining a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery includes: Determine, according to an equivalent circuit model corresponding to the lithium-ion battery, a first expression corresponding to a charging time required to charge the lithium-ion battery from a first state of charge to a second state of charge using a first current value; the first current value is related to the battery temperature; the first expression is used to establish an association relationship between the charging time, the state of charge, and the first charging current; Determine, according to a thermal model corresponding to the lithium-ion battery, a second expression corresponding to the battery temperature in a process of charging the lithium-ion battery from the first state of charge to the second state of charge using a first current value; the second expression is used to establish a correlation relationship between the charging time, the first current value, and the battery temperature; The first expression and the second expression are determined as a charging time calculation model.

10. A device for determining a charging path of a lithium-ion battery, characterized in that: The device comprises: A processing module, used for discretizing the charging interval formed by the initial state of charge of the lithium-ion battery and the target state of charge at the end of charging, to obtain n discrete states of charge including the initial state of charge and the target state of charge; n is an integer greater than 2; A first determination module is used to determine a charging time calculation model according to an equivalent circuit model and a thermal model corresponding to the lithium-ion battery; the charging time calculation model is used to establish a correlation relationship between the charging time, battery temperature and state of charge of the lithium-ion battery; A second determination module, configured to determine at least two preset battery temperatures corresponding to the discrete state of charge; a third determination module, configured to determine, according to an i-th discrete state of charge, an i-1th discrete state of charge and a preset battery temperature corresponding to the i-th discrete state of charge, a target charging time required to charge the lithium-ion battery from the i-1th discrete state of charge to the i-th discrete state of charge using the charging time calculation model; i is an integer greater than 0 and less than or equal to n; The fourth determination module is used to determine a target charging path for charging the lithium-ion battery from the initial state of charge to the target state of charge according to the target charging duration.

11. A vehicle, characterized in that: The vehicle comprises a lithium-ion battery and an electronic device, wherein the electronic device comprises a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory, used to store computer programs; The processor is used to implement the steps in the method for determining a charging path of a lithium-ion battery as claimed in any one of claims 1 to 9 when executing a program stored in the memory.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for determining a charging path of a lithium-ion battery according to any one of claims 1 to 9 are implemented.

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