Battery charging method, charging device, and charging equipment

Abstract

The present disclosure relates to a battery charging method, a charging device, and a charging equipment. In view of the problem that the existing battery may cause lithium deposition or excessive temperature rise due to continuous high-rate charging, the charging impedance curve corresponding to the rechargeable battery is determined based on the charging instruction; the real-time impedance of the rechargeable battery is obtained, and the impedance interval corresponding to the real-time impedance in the charging impedance curve is determined; according to the impedance interval corresponding to the real-time impedance, the current charging strategy of the rechargeable battery is determined, and the rechargeable battery is charged with the current charging strategy, and when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time, and the rechargeable battery is charged with the current charging strategy adjusted in real time. In this way, the charging strategy can be adjusted in real time according to the real-time impedance of the rechargeable battery, and the charging efficiency of the rechargeable battery can be improved, while reducing the problem that the battery may cause lithium deposition or excessive temperature rise due to continuous high-rate charging, thereby improving the charging reliability of the battery.

Description

Technical Field

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

[0002] Battery fast charging technology refers to increasing the charging rate, which can input more electrical energy into the battery in the same time, thereby speeding up the charging process and achieving fast charging. However, during the battery charging process, continuous high-rate charging may cause lithium deposition or excessive temperature rise in the battery. Summary of the invention

[0003] Based on this, it is necessary to provide a battery charging method, charging device, and charging equipment to address the problem that continuous high-rate charging in the prior art may cause lithium deposition in the battery or excessive temperature rise.

[0004] In order to achieve the above objectives, in a first aspect, the present disclosure provides a battery charging method, comprising:

[0005] In response to a charging instruction of the rechargeable battery, determining a charging impedance curve corresponding to the rechargeable battery;

[0006] Acquire the real-time impedance of the rechargeable battery, and determine that the real-time impedance is in an impedance interval corresponding to the charging impedance curve;

[0007] According to the impedance interval corresponding to the real-time impedance, the current charging strategy of the rechargeable battery is determined, and the rechargeable battery is charged with the current charging strategy. The real-time impedance of the rechargeable battery corresponds to a high impedance interval, and the current charging strategy is determined to be a first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to a low impedance interval, and the current charging strategy is determined to be a second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C;

[0008] When the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time, and the rechargeable battery is charged with the current charging strategy adjusted in real time.

[0009] Optionally, determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve includes:

[0010] Obtaining the maximum impedance value of the charging impedance curve;

[0011] According to the maximum impedance value and the real-time impedance, the real-time impedance is determined in an impedance interval corresponding to the charging impedance curve. If the real-time impedance is greater than 60% of the maximum impedance value, the real-time impedance corresponds to a high impedance interval. If the real-time impedance is less than 60% of the maximum impedance value, the real-time impedance corresponds to a low impedance interval.

[0012] Optionally, determining a charging impedance curve corresponding to the rechargeable battery includes:

[0013] Obtaining the current charging cycle number of the rechargeable battery;

[0014] Obtain the mapping relationship between the number of charging cycles and the charging impedance curve;

[0015] The mapping relationship between the number of charging cycles and the charging impedance curve is matched according to the number of charging cycles at that time, so as to obtain the charging impedance curve corresponding to the current charging of the rechargeable battery.

[0016] Optionally, the mapping relationship between the number of charging cycles and the charging impedance curve is constructed in the following manner:

[0017] Obtaining a charging impedance curve of a reference battery with different charging cycle numbers, wherein the charging impedance curve of the reference battery includes a corresponding relationship between a state of charge and an impedance value when the reference battery is charged from an empty state to a fully charged state;

[0018] According to the charging impedance curves of the reference battery with different charging cycle numbers, a mapping relationship between the charging cycle number and the charging impedance curve is constructed.

[0019] Optionally, obtaining a charging impedance curve of a reference battery with different charging cycle numbers includes:

[0020] Determining a plurality of different preset times, wherein the preset times are calculated starting from the initial charging of the reference battery;

[0021] Obtaining an initial voltage curve of the reference battery during initial charging;

[0022] Cyclic discharge and charge of the reference battery, discharge the reference battery to an empty state, and then charge the reference battery from an empty state to a fully charged state with a preset current, until the number of charging cycles of the reference battery reaches the preset number, obtain a first voltage curve of the reference battery at the preset number, and obtain a plurality of different first voltage curves at the preset number;

[0023] Determine a plurality of impedance values ​​corresponding to a plurality of charge states of each of the first voltage curves, fit the correspondence between the plurality of charge states and the plurality of impedance values ​​to obtain the charging impedance curve, and obtain a plurality of different charging impedance curves of the preset times;

[0024] The impedance value corresponding to the state of charge of the first voltage curve is calculated according to the following formula:

[0025] R SOCX = (V1-Vn) × I;

[0026] n is the preset number of times; SOCX is the charge state; Rn is the impedance value corresponding to the preset number of SOCX; V1 is the voltage value corresponding to the initial voltage curve of SOCX; Vn is the voltage value corresponding to the preset number of SOCX; I is the preset current.

[0027] Optionally, determining a charging impedance curve corresponding to the rechargeable battery includes:

[0028] Determining the negative electrode material of the rechargeable battery;

[0029] Obtaining the mapping relationship between the negative electrode material and the charging impedance curve;

[0030] According to the mapping relationship between the negative electrode material and the charging impedance curve matched with the negative electrode material of the rechargeable battery, a charging impedance curve corresponding to the rechargeable battery is obtained.

[0031] Optionally, the acquiring the real-time impedance of the rechargeable battery includes:

[0032] Acquire the real-time charging voltage and real-time state of charge of the rechargeable battery in real time;

[0033] The real-time impedance is obtained according to the real-time charging voltage and the real-time state of charge.

[0034] Optionally, the first charging strategy configures the first charging stage and the first passivation stage to be executed alternately, and the first charging strategy includes the charging rate and charging duration of the first charging stage, and the passivation rate and passivation duration of the first passivation stage;

[0035] The charging time of the first charging stage is determined according to the changing trend of the charging impedance curve. If the changing trend of the charging impedance curve increases, the charging time of the first charging stage decreases; if the changing trend of the charging impedance curve decreases, the charging time of the first charging stage increases.

[0036] The deactivation duration of the first deactivation stage is determined according to the change trend of the charging impedance curve. When the change trend of the charging impedance curve rises, the deactivation duration of the first deactivation stage increases, and when the change trend of the charging impedance curve decreases, the charging duration of the deactivation duration of the first deactivation stage decreases.

[0037] The second charging strategy configures the second charging stage and the second passivation stage to be executed alternately, and the second charging strategy includes the charging rate and charging duration of the second charging stage, and the passivation rate and passivation duration of the second passivation stage;

[0038] The charging time of the second charging stage is determined according to the changing trend of the charging impedance curve. If the changing trend of the charging impedance curve increases, the charging time of the second charging stage decreases; if the changing trend of the charging impedance curve decreases, the charging time of the second charging stage increases.

[0039] The passivation duration of the second passivation stage is determined according to the changing trend of the charging impedance curve. When the changing trend of the charging impedance curve rises, the passivation duration of the second passivation stage increases; when the changing trend of the charging impedance curve falls, the charging duration of the passivation duration of the second passivation stage decreases.

[0040] In a second aspect, the present disclosure provides a battery charging device, comprising:

[0041] A determination module, configured to determine a charging impedance curve corresponding to the current charging of the rechargeable battery in response to a charging instruction of the rechargeable battery;

[0042] A monitoring module, used for obtaining the real-time impedance of the rechargeable battery and determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve;

[0043] A charging module is used to determine the current charging strategy of the rechargeable battery according to the impedance interval corresponding to the real-time impedance, and charge the rechargeable battery with the current charging strategy. The real-time impedance of the rechargeable battery corresponds to a high impedance interval, and the current charging strategy is determined to be a first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to a low impedance interval, and the current charging strategy is determined to be a second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C; and when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time to charge the rechargeable battery with the current charging strategy adjusted in real time.

[0044] In a third aspect, the present disclosure provides a charging device, the charging device comprising: a power supply device and a controller;

[0045] Wherein, the power supply device is used to charge the rechargeable battery;

[0046] The controller includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery charging method described in the first aspect.

[0047] The battery charging method, charging device, and charging equipment disclosed in the present invention aim at the problem that the existing battery may cause lithium deposition or excessive temperature rise due to continuous high-rate charging. The charging impedance curve corresponding to the rechargeable battery is determined based on the charging instruction; the real-time impedance of the rechargeable battery is obtained, and the impedance interval corresponding to the real-time impedance in the charging impedance curve is determined; according to the impedance interval corresponding to the real-time impedance, the current charging strategy of the rechargeable battery is determined, and the rechargeable battery is charged with the current charging strategy. When the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time, and the rechargeable battery is charged with the current charging strategy adjusted in real time. Thus, the charging strategy can be adjusted in real time according to the real-time impedance of the rechargeable battery, and the charging efficiency of the rechargeable battery can be improved while reducing the problem that the battery may cause lithium deposition or excessive temperature rise due to continuous high-rate charging, thereby improving the charging reliability of the battery. Then, this scheme determines the current charging strategy from the interval of the charging impedance curve corresponding to the real-time impedance of the rechargeable battery. The real-time impedance of the rechargeable battery corresponds to the high-impedance interval, and the current charging strategy is the first charging strategy with a lower charging rate; the real-time impedance of the rechargeable battery corresponds to the low-impedance interval, and the current charging strategy is the second charging strategy with a higher charging rate. The scheme can select a suitable charging strategy according to the real-time impedance of the rechargeable battery, improve the charging efficiency of the rechargeable battery, and reduce the risk of causing lithium deposition or excessive temperature rise in the battery when charging at a high rate, thereby ensuring that the rechargeable battery maintains a good charging state during the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic diagram of a flow chart of a battery charging method provided in an embodiment;

[0050] Figure 2 A schematic diagram of an initial voltage curve and a first voltage curve of a preset number of times provided in an embodiment;

[0051] Figure 3 A schematic diagram of a charging impedance curve of a ternary lithium provided in an embodiment;

[0052] Figure 4 A charging schematic diagram of a second charging strategy provided in an embodiment;

[0053] Figure 5 is a schematic diagram of a charging impedance curve of lithium iron phosphate provided in an embodiment;

[0054] Figure 6 is a block diagram of a battery charging device provided in one embodiment;

[0055] Figure 7 is a block diagram of a charging device provided in an embodiment;

[0056] Figure 8 is a block diagram of a controller provided in one embodiment. DETAILED DESCRIPTION

[0057] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0059] As mentioned in the background technology, during the battery charging process, continuous high-rate charging may cause lithium deposition or excessive temperature rise in the battery. The charging rate refers to the speed at which the battery is charged or discharged, specifically the ratio of the current to the rated capacity of the battery during charging or discharging. For example, a 1000mAh battery, charging at a rate of 1C means a charging current of 1000mA, charging at a rate of 2C means a charging current of 2000mA, and so on.

[0060] Moreover, during the rapid charging process of the battery, the greater the charging rate, the greater the polarization of the battery. Polarization causes the negative electrode potential of the battery to drop rapidly. When charging at a high rate, a higher voltage is required to overcome the additional overpotential, which means that more energy is consumed in overcoming polarization during the charging process, and the efficiency of high-rate charging is reduced. In addition, long-term polarization will accelerate the degradation of battery materials, such as changes in the structure of electrode materials, decomposition of electrolytes, etc., which will lead to a gradual decrease in battery capacity and shorten the cycle life of the battery.

[0061] The battery charging method provided in the embodiment of the present application can be applied to the application environment of battery charging. Among them, the method can be applied to a terminal, a server, or a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptops, etc. Among them, the terminal determines the charging impedance curve corresponding to the rechargeable battery based on the charging instruction for the problem that the existing battery is continuously charged at a high rate and causes the battery to deposit lithium or the temperature rise is too high; obtains the real-time impedance of the rechargeable battery, and determines the impedance interval corresponding to the real-time impedance in the charging impedance curve; according to the impedance interval corresponding to the real-time impedance, determines the current charging strategy of the rechargeable battery, and charges the rechargeable battery with the current charging strategy, and when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, adjusts the current charging strategy in real time, and charges the rechargeable battery with the current charging strategy adjusted in real time. Thus, the charging strategy can be adjusted in real time according to the real-time impedance of the rechargeable battery, while improving the charging efficiency of the rechargeable battery, reducing the problem of the battery being continuously charged at a high rate and causing the battery to deposit lithium or the temperature rise is too high, thereby improving the charging reliability of the battery. Then, this scheme determines the current charging strategy from the interval of the charging impedance curve corresponding to the real-time impedance of the rechargeable battery. The real-time impedance of the rechargeable battery corresponds to the high-impedance interval, and the current charging strategy is the first charging strategy with a lower charging rate; the real-time impedance of the rechargeable battery corresponds to the low-impedance interval, and the current charging strategy is the second charging strategy with a higher charging rate. The scheme can select a suitable charging strategy according to the real-time impedance of the rechargeable battery, improve the charging efficiency of the rechargeable battery, and reduce the risk of causing lithium deposition or excessive temperature rise in the battery when charging at a high rate, thereby ensuring that the rechargeable battery maintains a good charging state during the charging process.

[0062] In an exemplary embodiment, Figure 1 As shown, a battery charging method is provided, which is described by taking the method applied to a terminal as an example, and includes the following steps S101 to S104. Among them:

[0063] Step S101, in response to a charging instruction of a rechargeable battery, determining a charging impedance curve corresponding to the rechargeable battery;

[0064] In this embodiment, the terminal determines a charging impedance curve corresponding to the rechargeable battery in response to a charging instruction of the rechargeable battery.

[0065] Among them, the charging instruction of the rechargeable battery is an instruction to instruct the terminal to start the charging power supply to charge the rechargeable battery. The charging instruction of the rechargeable battery received by the terminal can be the charging interface of the rechargeable battery plugged into the charging power supply, and the charging power supply can include but is not limited to a charging pile, a shared power supply, etc.; or, the charging instruction can be to start charging by swiping a card or scanning a code, and the terminal detects whether the charging pile has received the swiping card to start charging instruction or scanning a code to start charging instruction to start charging for the rechargeable battery, for example, the user uses the swiping card operation to charge the rechargeable battery; or, the charging instruction can be for the user to use the application in the mobile phone to scan the code, and according to the operation interface of the application, choose to start charging to charge the rechargeable battery.

[0066] In this embodiment, the terminal obtains the battery information of the rechargeable battery, and determines the corresponding charging impedance curve according to the battery information of the rechargeable battery. The battery information of the rechargeable battery may include, but is not limited to, the current state of charge of the rechargeable battery, the number of charging cycles, and the negative electrode material. The specific process of determining the charging impedance curve corresponding to the rechargeable battery will be described in detail later.

[0067] Step S102, obtaining the real-time impedance of the rechargeable battery, and determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve;

[0068] In this embodiment, the terminal obtains the real-time impedance of the initial charging state of the rechargeable battery based on the battery information of the rechargeable battery (current state of charge, number of charging cycles, and negative electrode material, etc.), and determines the impedance interval of the rechargeable battery corresponding to the charging impedance curve based on the initial impedance of the rechargeable battery.

[0069] Specifically, the terminal can search the database or mapping relationship table, query the charging impedance curve corresponding to the battery information of the rechargeable battery, obtain the charging impedance curve matching the rechargeable battery, use the charging impedance curve matching the rechargeable battery as the reference curve of the charging process of the rechargeable battery, determine the real-time impedance of the rechargeable battery in the impedance interval corresponding to the matching charging impedance curve, and obtain the impedance interval corresponding to the real-time impedance of the rechargeable battery. Among them, the terminal can query the charging impedance curve corresponding to each parameter in the battery information of the rechargeable battery, obtain the charging impedance curve corresponding to each battery information of the rechargeable battery, and the terminal evaluates the charging impedance curve corresponding to each battery information, and determines the most suitable charging impedance curve for the rechargeable battery according to the evaluation result. Alternatively, the terminal can query the charging impedance curve group corresponding to a parameter in the battery information of the rechargeable battery, and then query the charging impedance curves corresponding to other parameters in the charging impedance curve group to obtain the impedance interval corresponding to the real-time impedance of the rechargeable battery.

[0070] Among them, the charging impedance curve includes a high impedance interval and a low impedance interval. The high impedance interval and the low impedance interval can be determined according to parameters such as the maximum impedance value, the average impedance value, the curve trend, the rising amplitude, and the falling amplitude of the charging impedance curve. The specific determination process will be described in detail later.

[0071] Step S103, according to the impedance interval corresponding to the real-time impedance, determine the current charging strategy of the rechargeable battery, charge the rechargeable battery with the current charging strategy, the real-time impedance of the rechargeable battery corresponds to the high impedance interval, determine the current charging strategy to be the first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to the low impedance interval, determine the current charging strategy to be the second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C;

[0072] In this embodiment, the terminal determines the corresponding current charging strategy according to the real-time impedance of the initial charging state of the rechargeable battery. The real-time impedance of the initial charging state of the rechargeable battery corresponds to the high impedance interval, indicating that the internal resistance of the rechargeable battery is large, which may be caused by the high temperature of the battery, battery aging, or some changes in the battery. In order to avoid excessive pressure or damage to the battery, the current charging strategy is selected as the first charging strategy, and the rechargeable battery is charged using the first charging strategy. The charging rate of the first charging strategy is -0.2C-0.2C, where C represents the rated capacity of the battery, and the rate represents how many times the rated capacity is charged or discharged. The charging rate of the first charging strategy is low, and the charging current is relatively small when the rechargeable battery is charged at a charging rate of -0.2C-0.2C, which is beneficial to the long-term health of the battery. The real-time impedance of the initial charging state of the rechargeable battery corresponds to the low impedance interval, indicating that the internal resistance of the battery is small and the battery state is good. In order to charge quickly, the current charging strategy is determined to be the second charging strategy, and the rechargeable battery is charged using the second charging strategy. The charging rate range of the second charging strategy is 0.5C to 5C. Within this range, the charging current is large, which can significantly shorten the charging time. This method of adjusting the charging strategy according to the real-time impedance can more effectively manage the battery charging process and improve the battery charging efficiency and safety.

[0073] Step S104, when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time, and the rechargeable battery is charged with the current charging strategy adjusted in real time.

[0074] In this embodiment, during the charging process of the rechargeable battery, the terminal detects the real-time impedance of the rechargeable battery in real time, determines the impedance interval corresponding to the real-time impedance of the rechargeable battery, and adjusts the current charging strategy if the impedance interval corresponding to the real-time impedance of the rechargeable battery changes. The impedance interval corresponding to the rechargeable battery changes from a high impedance interval to a low impedance interval, indicating that the internal resistance of the rechargeable battery has decreased, and immediately switches from the first charging strategy (low-rate charging) to the second charging strategy (high-rate charging) to speed up the charging speed. The impedance interval corresponding to the rechargeable battery changes from a low impedance interval to a high impedance interval, and the internal resistance of the rechargeable battery increases. At this time, immediately switch from the second charging strategy (high-rate charging) to the first charging strategy (low-rate charging) to reduce potential damage to the rechargeable battery.

[0075] Based on the above scheme, according to the real-time impedance of the rechargeable battery, the impedance interval corresponding to the charging impedance curve of the rechargeable battery is determined, the impedance interval corresponding to the rechargeable battery determines the current charging strategy of the rechargeable battery, and the current charging strategy of the rechargeable battery is adjusted in real time according to the change of the impedance interval corresponding to the rechargeable battery. When the rechargeable battery is in the low impedance interval, the second charging strategy is adopted to perform high-rate charging, so that the rechargeable battery can be quickly charged and the charging time can be shortened. When the rechargeable battery is in the high impedance interval, the first charging strategy is adopted to perform low-rate charging, so that the real-time impedance of the rechargeable battery can be quickly reduced to the low impedance interval, which is conducive to extending the charging time of the rechargeable battery using the second charging strategy, extending the time of the rechargeable battery using high-rate charging, improving the charging efficiency, shortening the charging time, so that the rechargeable battery can be quickly charged. At the same time, when the rechargeable battery is in the high impedance interval, low-rate charging is adopted, which can avoid the risk of causing battery lithium deposition or excessive temperature rise due to continuous high-rate charging of the rechargeable battery, and ensure that the rechargeable battery maintains a good charging state during the charging process; it can ensure that the rechargeable battery can be safely and efficiently charged in different states, thereby extending the battery life and improving the charging efficiency.

[0076] Optionally, determining the real-time impedance in the impedance interval corresponding to the charging impedance curve includes: obtaining the maximum impedance value of the charging impedance curve; determining the real-time impedance in the impedance interval corresponding to the charging impedance curve according to the maximum impedance value and the real-time impedance, when the real-time impedance is greater than 60% of the maximum impedance value, the real-time impedance corresponds to the high impedance interval, and when the real-time impedance is less than 60% of the maximum impedance value, the real-time impedance corresponds to the low impedance interval.

[0077] In this embodiment, the impedance interval of the charging impedance curve is defined according to the impedance maximum value of the charging impedance curve. If the impedance value is more than 60% of the impedance maximum value, it is a high impedance interval, and if the impedance value is less than 60% of the impedance maximum value, it is a low impedance interval. For example, if the impedance maximum value of the charging impedance curve is 100Ω and the real-time impedance of the rechargeable battery is 70Ω, it corresponds to the high impedance interval, and the first charging strategy is used for low-rate charging. If the real-time impedance of the rechargeable battery is 50Ω, it corresponds to the low impedance interval, and the second charging strategy is used for high-rate charging.

[0078] Optionally, in other embodiments, the impedance interval of the charging impedance curve is defined according to the impedance average value of the charging impedance curve, and an impedance value greater than the impedance average value is a high impedance interval, and an impedance value less than the impedance average value is a low impedance interval.

[0079] Optionally, in other embodiments, the impedance interval of the charging impedance curve may also be defined according to the curve trend, rising amplitude, and falling amplitude of the charging impedance curve.

[0080] Optionally, determining a charging impedance curve corresponding to the rechargeable battery includes:

[0081] Step S101-1: Obtain the current charging cycle number of the rechargeable battery; the terminal can obtain the current charging cycle number of the rechargeable battery through a battery management system (BMS) or other battery monitoring equipment. It is understandable that the charging impedance of the battery will change with the increase of the number of charge and discharge cycles. Obtaining the current charging cycle number of the rechargeable battery is convenient for determining the corresponding charging impedance curve according to the current charging cycle number of the rechargeable battery, selecting a suitable charging strategy for charging, and improving charging efficiency.

[0082] Step S101-2: Obtain a mapping relationship between the number of charging cycles and the charging impedance curve; the mapping relationship between the number of charging cycles and the charging impedance curve includes the charging impedance curve of the battery under different charging cycle numbers, the mapping relationship between the number of charging cycles and the charging impedance curve can be obtained through experimental data or empirical formulas, and the mapping relationship between the number of charging cycles and the charging impedance curve is stored in a mapping relationship table or database.

[0083] Step S101-3: According to the current charging cycle number, the mapping relationship between the charging cycle number and the charging impedance curve is matched to obtain the charging impedance curve corresponding to the current charging of the rechargeable battery. The terminal searches the mapping relationship table or database to match and obtain the charging impedance curve corresponding to the current charging cycle number of the rechargeable battery.

[0084] Optionally, the mapping relationship between the number of charging cycles and the charging impedance curve is constructed in the following manner:

[0085] Step S201: obtaining a charging impedance curve of a reference battery with different charging cycle times, wherein the charging impedance curve of the reference battery includes a corresponding relationship between a state of charge and an impedance value when the reference battery is charged from an empty state to a fully charged state;

[0086] In this embodiment, when the reference battery is charged to different charging cycles, the terminal obtains the corresponding relationship between the state of charge (SOC) and the impedance value of the reference battery during the process of charging the reference battery from an empty state (i.e., a fully discharged state) to a fully charged state (i.e., a fully charged state), and establishes a charging impedance curve for different charging cycles of the reference battery. The specific process of obtaining the charging impedance curve for different charging cycles of the reference battery will be described in detail later.

[0087] In this embodiment, the reference battery is the same battery as the rechargeable battery, wherein the reference battery and the rechargeable battery being the same means that the reference battery and the rechargeable battery have the same model or the same factory batch, the reference battery and the rechargeable battery have the same negative electrode material, the reference battery and the rechargeable battery have the same capacity, etc.

[0088] Step S202: constructing a mapping relationship between the number of charging cycles and the charging impedance curve according to the charging impedance curves of reference batteries with different charging cycle numbers.

[0089] In this embodiment, the terminal constructs a mapping relationship between the number of charging cycles and the charging impedance curve according to the charging impedance curve of the reference battery with different charging cycle numbers. The specific process of constructing the mapping relationship between the number of charging cycles and the charging impedance curve will be described in detail later.

[0090] It can be understood that the mapping relationship between the number of charging cycles and the charging impedance curve can be implemented using charts, data, models, and formulas, and the terminal stores the mapping relationship between the number of charging cycles and the charging impedance curve in a mapping relationship table or database. After the terminal executes the step of obtaining the mapping relationship between the number of charging cycles and the charging impedance curve, it parses the mapping relationship between the number of charging cycles and the charging impedance curve to obtain a charging impedance curve that matches the number of charging cycles.

[0091] Optionally, obtaining a charging impedance curve of a reference battery with different charging cycle numbers includes:

[0092] Step S2011: determining a plurality of different preset times, where the preset times are calculated based on the initial charging of the reference battery;

[0093] In this embodiment, a plurality of different preset times are determined, for example, 100 cls, 200 cls, 300 cls, 400 cls, 500 cls, 600 cls, 700 cls, 800 cls, 900 cls, and 1000 cls can be set.

[0094] Step S2012: obtaining an initial voltage curve of the reference battery during initial charging;

[0095] In this embodiment, the reference battery is discharged to an empty state using a standard discharge process. Then, the reference battery is charged at a charge rate of 0.02C, and a voltage point V is obtained after charging for 30 minutes and resting for 60 minutes. x and the corresponding state of charge SOCX, until the reference battery is charged to a full charge state, all the voltage points obtained and all the states of charge corresponding to all the voltage points are fitted to obtain the initial voltage curve of the reference battery for the first time. It can be understood that the SOC of the empty state of the initial voltage curve of the reference battery for the first time is 0, and the SOC of the fully charged state is 100.

[0096] Step S2013: cyclically discharge and charge the reference battery, discharge the reference battery to an empty state, and then charge the reference battery from an empty state to a fully charged state with a preset current, until the number of charging cycles of the reference battery reaches a preset number, obtain a first voltage curve of the reference battery at the preset number, and obtain a plurality of first voltage curves of different preset numbers;

[0097] In this embodiment, refer to Figure 2 After the reference battery is initially charged to a fully charged state, the reference battery is discharged to an empty state using a standard discharge process, and then the reference battery is charged to a fully charged state, and this process is repeated.

[0098] The reference battery is charged with the rated current every 100cls (that is, every time a set preset number of times is reached), and multiple voltage points of the reference battery are collected at each set time interval. For example, the set time can be defined as 0.1s, 0.2s, etc., and multiple charge states corresponding to the multiple voltage points of the reference battery at the preset number of times are calculated based on the first voltage curve.

[0099] In this embodiment, the following formula is used to calculate the charge state of the reference battery at the voltage point at the preset number of times:

[0100] SOCX=SOC1+(SOC2-SOC1)×

[0101] Reference Figure 2 , SOCX is the state of charge of the reference battery at a preset number of times, SOC1 is the state of charge of the reference battery in an empty state at a preset number of times, SOC2 is the state of charge of the reference battery in a fully charged state at a preset number of times, Cx is the charging capacity of the reference battery at SOCX of the preset number of times, and C1 is the charging capacity at SOCX in the initial voltage curve.

[0102] For example, at 1000cls, Cx is 160Ah, C1 is 320Ah, SOC1 is 5%, and SOC2 is 95%.

[0103] SOCX=5%+(95%-5%)× =50%.

[0104] In this embodiment, the terminal calculates the state of charge of the reference battery corresponding to the voltage points of a preset number of times through the above formula instead of directly obtaining the state of charge of the reference battery. This is because after the reference battery has undergone multiple charging cycles, the actual state of charge of the reference battery is lower than the state of charge obtained by the terminal through the battery management system or other battery monitoring equipment. In this way, the accuracy of the state of charge corresponding to the voltage point of the first voltage curve is ensured.

[0105] Step S2014: determining a plurality of impedance values ​​corresponding to a plurality of charge states of each first voltage curve, fitting a correspondence between the plurality of charge states and the plurality of impedance values ​​to obtain a charging impedance curve, and obtaining a plurality of charging impedance curves of different preset times;

[0106] The impedance value corresponding to the state of charge of the first voltage curve is calculated according to the following formula:

[0107] R SOCX = (V1-Vn) × I;

[0108] n is the preset number of times; SOCX is the state of charge; Rn is the impedance value corresponding to the preset number of SOCX; V1 is the voltage value corresponding to the initial voltage curve of SOCX; Vn is the voltage value corresponding to the preset number of SOCX; I is the preset current.

[0109] Reference Figure 2 , example, Rn SOC50 =(3.38V-3.18V)×120Ah=24Ω

[0110] In this embodiment, the terminal calculates multiple impedance values ​​Rn corresponding to multiple charge states SOCx of each first voltage curve. SOCX , multiple impedance values ​​Rn corresponding to multiple charge states SOCx SOCX The corresponding relationship is fitted to obtain a charging impedance curve, and a plurality of charging impedance curves of different preset times are obtained. Among them, linear regression, polynomial fitting, nonlinear fitting, etc. can be used to fit the state of charge SOCx and the impedance value Rn SOCX The corresponding relationship between them.

[0111] Optionally, determining a charging impedance curve corresponding to the rechargeable battery includes:

[0112] Step S101-4: Determine the negative electrode material of the rechargeable battery;

[0113] In this embodiment, the terminal can obtain the negative electrode material of the rechargeable battery through a battery management system (BMS) or other battery monitoring equipment, such as lithium iron phosphate, lithium iron manganese phosphate, ternary lithium, etc. The charging impedance curves of different negative electrode materials vary greatly, which affects the charging process of the rechargeable battery.

[0114] Step S101-5: obtaining a mapping relationship between negative electrode materials and charging impedance curves;

[0115] In this embodiment, the mapping relationship between the negative electrode material and the charging impedance curve includes the charging impedance curves of batteries with different negative electrode materials. The mapping relationship between the negative electrode material and the charging impedance curve can be obtained through experimental data or empirical formulas. The mapping relationship between the negative electrode material and the charging impedance curve is stored in a mapping relationship table or database.

[0116] Step S101 - 6 : matching the mapping relationship between the negative electrode material and the charging impedance curve according to the negative electrode material of the rechargeable battery to obtain the charging impedance curve corresponding to the rechargeable battery.

[0117] In this embodiment, the terminal searches the mapping relationship table or database to obtain the charging impedance curve corresponding to the negative electrode material of the rechargeable battery.

[0118] In an exemplary embodiment, referring to Figure 3 The terminal obtains that the negative electrode material of the rechargeable battery is ternary lithium, obtains the mapping relationship between the ternary lithium and the charging impedance curve, and obtains the charging impedance curve of the ternary lithium. The maximum impedance of the charging impedance curve of the ternary lithium is 16Ω. The SOC0-SOC 25 In the high impedance range, SOC 25 -SOC 85 For low impedance range, SOC 85 -SOC 100 It is a high impedance range.

[0119] The real-time impedance of the rechargeable battery corresponds to the high impedance interval. The first charging strategy is used to charge the rechargeable battery, the charging rate is -0.2C-0.2C, and the charging current is relatively small, so as to reduce the real-time impedance of the rechargeable battery. The real-time impedance of the rechargeable battery corresponds to the low impedance interval. The second charging strategy is used to charge the rechargeable battery, the charging rate is 0.5C-5C, and the charging current is large, which can significantly shorten the charging time.

[0120] In an exemplary embodiment, referring to Figure 5 The terminal obtains that the negative electrode material of the rechargeable battery is lithium iron phosphate, obtains the mapping relationship between lithium iron phosphate and the charging impedance curve, and obtains the charging impedance curve of lithium iron phosphate. The maximum impedance of the charging impedance curve of lithium iron phosphate is 150Ω. The SOC0-SOC35 For low impedance range, SOC 35 -SOC 40 In the high impedance range, SOC 40 -SOC 100 The real-time impedance of the rechargeable battery corresponds to the high impedance interval, and the first charging strategy is used to charge the rechargeable battery to reduce the real-time impedance of the rechargeable battery. The real-time impedance of the rechargeable battery corresponds to the low impedance interval, and the second charging strategy is used to charge the rechargeable battery.

[0121] Optionally, obtaining the real-time impedance of the charging battery includes:

[0122] Step S1021: Real-time acquisition of the real-time charging voltage and real-time state of charge of the rechargeable battery; sensors are installed on the positive and negative electrodes of the rechargeable battery to detect the positive and negative electrode voltages, and to measure the charging voltage of the rechargeable battery in real time. The terminal reads the sensor to obtain the real-time charging voltage of the rechargeable battery. The terminal monitors the charging parameters of the rechargeable battery through the battery management system (BMS), and the charging parameters include but are not limited to the capacity of the rechargeable battery, the capacity charged in the rechargeable battery, the charging current, etc.; the terminal calculates the real-time state of charge of the rechargeable battery. The terminal calculates the real-time state of charge of the rechargeable battery in the same way as in step S2013, and uses the following formula to calculate the real-time state of charge of the rechargeable battery.

[0123] SOCX=SOC1+(SOC2-SOC1)×

[0124] SOCX is the real-time state of charge of the rechargeable battery, SOC1 is the state of charge of the rechargeable battery when it is empty for a preset number of times, SOC2 is the state of charge of the rechargeable battery when it is fully charged for a preset number of times, Cx is the charging capacity of the rechargeable battery at SOCX for a preset number of times, and C1 is the charging capacity at SOCX in the initial voltage curve.

[0125] Step S1022: obtaining the real-time impedance according to the real-time charging voltage and the real-time state of charge.

[0126] In this embodiment, the real-time impedance of the rechargeable battery is calculated using the following formula:

[0127] R SOCX = (V1-Vn) × I;

[0128] SOCX is the real-time state of charge of the rechargeable battery; R is the real-time impedance corresponding to SOCX of the rechargeable battery; V1 is the voltage value corresponding to SOCX of the initial voltage curve; Vn is the real-time voltage value of the rechargeable battery; I is the preset current.

[0129] Optionally, the real-time impedance of the rechargeable battery can be obtained by the following implementation: first, determine the negative electrode material of the rechargeable battery, obtain the mapping relationship between the negative electrode material and the charging impedance curve, match the mapping relationship between the negative electrode material and the charging impedance curve according to the negative electrode material of the rechargeable battery, and obtain the charging impedance curve group corresponding to the rechargeable battery, and the charging impedance curve group corresponding to the rechargeable battery includes charging impedance curves of multiple charging cycle numbers. Then, obtain the current charging cycle number of the rechargeable battery, and obtain the mapping relationship between the charging cycle number and the charging impedance curve; search for the charging impedance curve group corresponding to the rechargeable battery, match the mapping relationship between the charging cycle number and the charging impedance curve according to the current charging cycle number, and obtain the charging impedance curve corresponding to the current charging of the rechargeable battery.

[0130] In this embodiment, the negative electrode material of the battery is first determined, and the corresponding charging impedance curve group is found using the known mapping relationship. After the number of charging cycles of the battery is determined, the charging impedance curve group is searched to find the corresponding charging impedance curve, which is beneficial to battery management, battery health monitoring and optimization of charging strategies. By understanding the charging impedance of the battery, the charging process can be better controlled to avoid harmful situations such as overcharging and over-discharging, thereby extending the service life of the battery.

[0131] Optionally, during the entire charging process of the rechargeable battery, the terminal also continuously monitors the safety status of the battery, including parameters such as temperature, voltage and current, and immediately stops charging if any abnormality or potential safety risk is found.

[0132] Optionally, the first charging strategy configures the first charging stage and the first passivation stage to be executed alternately, and the first charging strategy includes the charging rate and charging duration of the first charging stage, the passivation rate and passivation duration of the first passivation stage; the charging duration of the first charging stage is determined according to the changing trend of the charging impedance curve, the charging impedance curve changes with an upward trend, the charging duration of the first charging stage decreases, the charging impedance curve changes with a downward trend, the charging duration of the first charging stage increases; the passivation duration of the first passivation stage is determined according to the changing trend of the charging impedance curve, the charging impedance curve changes with an upward trend, the passivation duration of the first passivation stage increases, the charging impedance curve changes with a downward trend, the charging duration of the passivation duration of the first passivation stage decreases. In this embodiment, the charging duration of each time in the first charging stage is 1 second to 600 seconds, and the passivation duration of the first passivation stage is 1 second to 60 seconds.

[0133] The present embodiment is described by taking the negative electrode material of the rechargeable battery as ternary lithium as an example. Figure 3 , the SOC0-SOC of the charging impedance curve of the rechargeable battery 25 In the SOC0-SOC 25The changing trend of the interval charging impedance curve continues to decline. The first charging strategy is used to charge the rechargeable battery. The first charging stage and the first passivation stage are executed alternately. As the charging progresses, the charging time of the first charging stage gradually increases, and the passivation time of the first passivation stage gradually decreases. Among them, the continuous downward trend of the charging impedance curve indicates that the impedance value is reduced, the polarization effect of the battery is reduced, and shortening the passivation time can make the real-time impedance of the rechargeable battery be reduced to the low impedance interval faster.

[0134] SOC of a rechargeable battery corresponding to the charging impedance curve 85 -SOC 100 During the interval, the changing trend of the charging impedance curve continues to rise, and the first charging strategy is adopted. With the charging progress, the charging time of the first charging stage gradually decreases, and the passivation time of the first passivation stage gradually decreases. The passivation treatment of the high impedance area is strengthened to eliminate polarization and accumulated charge.

[0135] In some embodiments, the charging rate of the first charging stage is also determined according to the changing trend of the charging impedance curve. When the changing trend of the charging impedance curve rises, the charging rate of the first charging stage decreases, and when the changing trend of the charging impedance curve falls, the charging rate of the first charging stage increases. The charging rate of the first charging stage is 0C-0.2C.

[0136] In some embodiments, the charging rate of the first passivation stage is also determined according to the changing trend of the charging impedance curve. When the changing trend of the charging impedance curve increases, the charging rate of the first passivation stage decreases, and when the changing trend of the charging impedance curve decreases, the charging rate of the first passivation stage increases. The charging rate of the first charging stage is -0.2C-0C.

[0137] Optionally, the second charging strategy configures the second charging stage and the second passivation stage to be executed alternately, and the second charging strategy includes the charging rate and charging duration of the second charging stage, the passivation rate and passivation duration of the second passivation stage; the charging duration of the second charging stage is determined according to the changing trend of the charging impedance curve, the charging impedance curve changes with an upward trend, the charging duration of the second charging stage decreases, the charging impedance curve changes with a downward trend, and the charging duration of the second charging stage increases; the passivation duration of the second passivation stage is determined according to the changing trend of the charging impedance curve, the charging impedance curve changes with an upward trend, the passivation duration of the second passivation stage increases, the charging impedance curve changes with a downward trend, and the charging duration of the passivation duration of the second passivation stage decreases. In this embodiment, the charging duration of each time in the second charging stage is 1 second to 600 seconds, and the passivation duration of each time in the second passivation stage is 1 second to 60 seconds.

[0138] In some embodiments, the charging rate of the second charging stage is also determined according to the changing trend of the charging impedance curve. If the changing trend of the charging impedance curve increases, the charging rate of the first charging stage decreases, and if the changing trend of the charging impedance curve decreases, the charging rate of the second charging stage increases. The charging rate of the first charging stage is 2.5C-5C.

[0139] In some embodiments, the charging rate of the second passivation stage is also determined according to the changing trend of the charging impedance curve. When the changing trend of the charging impedance curve increases, the charging rate of the second passivation stage decreases, and when the changing trend of the charging impedance curve decreases, the charging rate of the first passivation stage increases. The charging rate of the first charging stage is -0.2-2C.

[0140] In an exemplary embodiment, the negative electrode material of the rechargeable battery is ternary lithium, referring to Figure 4 As shown, refer to Figure 4 The figure shows a schematic diagram of charging in the low impedance range using the second charging strategy. Among them, I1-I5 are the charging currents in the second charging stage, the current values ​​of I1 to I5 are between 0.5C and 5C, I0 is the passivation current, and I0 is 0.2C. T1-T9 are the charging duration of the second charging stage, and T is between 1 and 600 seconds. t1-t4, t6-t9 are the passivation durations of the second passivation stage, and t is between 1 and 60 seconds.

[0141] Reference Figure 3 , Figure 4 As shown, the real-time impedance of the rechargeable battery corresponds to the low impedance interval. As the charging progresses, the charging impedance curve changes in a decreasing trend, the charging time T1-T5 of the second charging stage gradually increases, the charging rate of the second charging stage continues to increase, the charging current T1-T5 of the second charging stage gradually increases from I1 to I5, and the deactivation time t1-t4 of the second deactivation stage gradually decreases. That is, in the low impedance interval, as the charging impedance curve changes in a decreasing trend as the charging progresses, the charging time of the second charging stage is extended and the charging rate of the second charging stage is increased, the time of the second deactivation stage is reduced, the charging efficiency of the battery is accelerated, the time to fully charge the battery is shortened, fast charging is achieved, and the charging efficiency is improved.

[0142] As the charging progresses, the charging impedance curve changes from a downward trend to an upward trend. The second charging strategy is adopted to continue charging the rechargeable battery. The charging time T5-T9 of the second charging stage gradually decreases, the charging current T8-T9 of the second charging stage gradually decreases from I5 to I1, and the deactivation time t6-t9 of the second deactivation stage gradually increases. In the middle and late stages of charging, due to slight changes in the internal structure of the battery (such as changes in electrolyte concentration, increases in battery temperature, etc.), the impedance of the battery gradually increases, resulting in a slow charging speed. This embodiment can more effectively remove polarization and improve the available capacity and charging efficiency of the battery by shortening the charging time of the second charging stage, reducing the charging rate of the second charging stage, and increasing the duration of the second deactivation stage.

[0143] Among them, battery polarization refers to: during the charge and discharge process of the battery, due to the incomplete reversibility of the electrode reaction, the ohmic resistance of the electrolyte solution, and the concentration polarization of the electrode surface, a potential difference will be generated inside the battery, that is, polarization phenomenon. Polarization phenomenon will reduce the discharge voltage and charging efficiency of the battery.

[0144] In this embodiment, the first charging strategy configures the first charging stage and the first passivation stage to be executed alternately, and the second charging strategy configures the second charging stage and the second passivation stage to be executed alternately. By configuring the passivation stage to be eliminated, the polarization phenomenon is eliminated or alleviated, and the performance and service life of the rechargeable battery are optimized, which is beneficial to suppress the increase in the impedance of the rechargeable battery, extend the time the rechargeable battery corresponds to the low impedance interval, extend the charging time of the rechargeable battery using the second charging strategy with a high charging rate, and shorten the time required to charge the battery to a fully charged state.

[0145] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0146] Based on the same inventive concept, the embodiment of the present application also provides a device for implementing the battery charging method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery charging device embodiments provided below can refer to the limitations on the battery charging method above, and will not be repeated here.

[0147] In an exemplary embodiment, Figure 6 As shown, a battery charging device is provided, comprising:

[0148] The determination module 310 is used to determine the charging impedance curve corresponding to the current charging of the rechargeable battery in response to the charging instruction of the rechargeable battery;

[0149] A monitoring module 320, for obtaining the real-time impedance of the rechargeable battery and determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve;

[0150] The charging module 330 is used to determine the current charging strategy of the rechargeable battery according to the impedance interval corresponding to the real-time impedance, and charge the rechargeable battery with the current charging strategy. The real-time impedance of the rechargeable battery corresponds to the high impedance interval, and the current charging strategy is determined to be the first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to the low impedance interval, and the current charging strategy is determined to be the second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C; and when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time, and the rechargeable battery is charged with the current charging strategy adjusted in real time.

[0151] Optionally, the determination module 310 is specifically used to: obtain the number of charging cycles of the rechargeable battery; obtain the mapping relationship between the number of charging cycles and the charging impedance curve; match the mapping relationship between the number of charging cycles and the charging impedance curve according to the number of charging cycles, and obtain the charging impedance curve corresponding to the current charging of the rechargeable battery.

[0152] Optionally, the determination module 310 is specifically used to: determine the negative electrode material of the rechargeable battery; obtain the mapping relationship between the negative electrode material and the charging impedance curve; match the mapping relationship between the negative electrode material and the charging impedance curve according to the negative electrode material of the rechargeable battery to obtain the charging impedance curve corresponding to the rechargeable battery.

[0153] Optionally, the monitoring module 320 is specifically used to: obtain the real-time charging voltage and real-time state of charge of the rechargeable battery in real time; and obtain the real-time impedance according to the real-time charging voltage and real-time state of charge.

[0154] Optionally, the monitoring module 320 is also used to: obtain the maximum impedance value of the charging impedance curve; determine the real-time impedance in the impedance interval corresponding to the charging impedance curve based on the maximum impedance value and the real-time impedance, when the real-time impedance is greater than 60% of the maximum impedance value, the real-time impedance corresponds to the high impedance interval, and when the real-time impedance is less than 60% of the maximum impedance value, the real-time impedance corresponds to the low impedance interval.

[0155] Optionally, the battery charging device further comprises:

[0156] A mapping construction module is used to obtain the charging impedance curve of a reference battery with different charging cycle numbers, wherein the charging impedance curve of the reference battery includes the corresponding relationship between the charge state and the impedance value when the reference battery is charged from an empty state to a fully charged state; and according to the charging impedance curve of the reference battery with different charging cycle numbers, a mapping relationship between the charging cycle number and the charging impedance curve is constructed.

[0157] Mapping building blocks, specifically for:

[0158] Determine a plurality of different preset times, the preset times being calculated based on the initial charging of the reference battery;

[0159] Obtaining an initial voltage curve of the reference battery during initial charging;

[0160] Cyclic discharge and charge of a reference battery, discharge the reference battery to an empty state, and then charge the reference battery from an empty state to a fully charged state with a preset current, until the number of charging cycles of the reference battery reaches a preset number, obtain a first voltage curve of the reference battery at the preset number, and obtain a plurality of first voltage curves of different preset numbers;

[0161] Determine multiple impedance values ​​corresponding to multiple charge states of each first voltage curve, fit the corresponding relationship between the multiple charge states and the multiple impedance values ​​to obtain a charging impedance curve, and obtain multiple charging impedance curves of different preset times;

[0162] The impedance value corresponding to the state of charge of the first voltage curve is calculated according to the following formula:

[0163] R SOCX = (V1-Vn) × I;

[0164] n is the preset number of times; SOCX is the charge state; Rn is the impedance value corresponding to the preset number of SOCX; V1 is the voltage value corresponding to the initial voltage curve of SOCX; Vn is the voltage value corresponding to the preset number of SOCX; I is the preset current.

[0165] Optionally, the mapping construction module is also used to construct a mapping relationship between the negative electrode material and the charging impedance curve.

[0166] Each module in the above-mentioned wiring parameter determination device of the power transmission network can be implemented in whole or in part by software, hardware or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the controller in the form of hardware, or can be stored in the memory in the controller in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0167] Thirdly, refer to Figure 7 The present disclosure provides a charging device 400, which includes: a power supply device 401 and a controller 402; wherein the power supply device 401 is used to charge a rechargeable battery; the controller 402 includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery charging method in the above embodiment.

[0168] In an exemplary embodiment, the controller 402 may be a terminal, and its internal structure diagram may be as follows: Figure 8 As shown. The controller 402 includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. Among them, the processor of the controller is used to provide computing and control capabilities. The memory of the controller includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the controller is used to exchange information between the processor and the external device. The communication interface of the controller is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for determining the wiring parameters of a power transmission network is implemented. The display unit of the controller is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the controller can be a touch layer covering the display screen, or a button, trackball or touchpad set on the controller housing, or an external keyboard, touchpad or mouse.

[0169] Those skilled in the art will understand that Figure 8The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the controller to which the scheme of the present application is applied. The specific controller may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0170] In a fourth aspect, the present disclosure provides a computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a processor to implement the battery charging method of the first aspect when executed.

[0171] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of any one of the methods in the first aspect.

[0172] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0173] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0174] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery charging method, characterized in that: include: In response to a charging instruction of the rechargeable battery, determining a charging impedance curve corresponding to the rechargeable battery; Acquire the real-time impedance of the rechargeable battery, and determine that the real-time impedance is in an impedance interval corresponding to the charging impedance curve; According to the impedance interval corresponding to the real-time impedance, the current charging strategy of the rechargeable battery is determined, and the rechargeable battery is charged with the current charging strategy. The real-time impedance of the rechargeable battery corresponds to a high impedance interval, and the current charging strategy is determined to be a first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to a low impedance interval, and the current charging strategy is determined to be a second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C; When the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, adjusting the current charging strategy in real time, and charging the rechargeable battery with the current charging strategy adjusted in real time; The determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve includes: Obtaining the maximum impedance value of the charging impedance curve; According to the maximum impedance value and the real-time impedance, the real-time impedance is determined in an impedance interval corresponding to the charging impedance curve. If the real-time impedance is greater than 60% of the maximum impedance value, the real-time impedance corresponds to a high impedance interval. If the real-time impedance is less than 60% of the maximum impedance value, the real-time impedance corresponds to a low impedance interval.

2. The battery charging method according to claim 1, characterized in that: The determining of the charging impedance curve corresponding to the rechargeable battery includes: Obtaining the current charging cycle number of the rechargeable battery; Obtain the mapping relationship between the number of charging cycles and the charging impedance curve; The mapping relationship between the number of charging cycles and the charging impedance curve is matched according to the number of charging cycles at that time, so as to obtain the charging impedance curve corresponding to the current charging of the rechargeable battery.

3. The battery charging method according to claim 2, characterized in that: The mapping relationship between the number of charging cycles and the charging impedance curve is constructed in the following manner: Obtaining a charging impedance curve of a reference battery with different charging cycle numbers, wherein the charging impedance curve of the reference battery includes a corresponding relationship between a state of charge and an impedance value when the reference battery is charged from an empty state to a fully charged state; According to the charging impedance curves of the reference battery with different charging cycle numbers, a mapping relationship between the charging cycle number and the charging impedance curve is constructed.

4. The battery charging method according to claim 3, characterized in that: The step of obtaining a charging impedance curve of a reference battery with different charging cycle times includes: Determining a plurality of different preset times, wherein the preset times are calculated starting from the initial charging of the reference battery; Obtaining an initial voltage curve of the reference battery during initial charging; Cyclic discharge and charge of the reference battery, discharge the reference battery to an empty state, and then charge the reference battery from an empty state to a fully charged state with a preset current, until the number of charging cycles of the reference battery reaches the preset number, obtain a first voltage curve of the reference battery at the preset number, and obtain a plurality of different first voltage curves at the preset number; Determine a plurality of impedance values ​​corresponding to a plurality of charge states of each of the first voltage curves, fit the correspondence between the plurality of charge states and the plurality of impedance values ​​to obtain the charging impedance curve, and obtain a plurality of different charging impedance curves of the preset times; The impedance value corresponding to the state of charge of the first voltage curve is calculated according to the following formula: Rn SOCX =(V1-Vn)×I; n is the preset number of times; SOCX is the charge state; Rn is the impedance value corresponding to the preset number of SOCX; V1 is the voltage value corresponding to the initial voltage curve of SOCX; Vn is the voltage value corresponding to the preset number of SOCX; I is the preset current.

5. The battery charging method according to claim 1, characterized in that: The determining of the charging impedance curve corresponding to the rechargeable battery includes: Determining the negative electrode material of the rechargeable battery; Obtaining the mapping relationship between the negative electrode material and the charging impedance curve; According to the mapping relationship between the negative electrode material and the charging impedance curve matched with the negative electrode material of the rechargeable battery, a charging impedance curve corresponding to the rechargeable battery is obtained.

6. The battery charging method according to claim 1, characterized in that: The obtaining of the real-time impedance of the rechargeable battery comprises: Acquire the real-time charging voltage and real-time state of charge of the rechargeable battery in real time; The real-time impedance is obtained according to the real-time charging voltage and the real-time state of charge.

7. The battery charging method according to claim 1, characterized in that: The first charging strategy configures the first charging stage and the first passivation stage to be executed alternately, and the first charging strategy includes the charging rate and charging duration of the first charging stage, and the passivation rate and passivation duration of the first passivation stage; The charging time of the first charging stage is determined according to the changing trend of the charging impedance curve. If the changing trend of the charging impedance curve increases, the charging time of the first charging stage decreases; if the changing trend of the charging impedance curve decreases, the charging time of the first charging stage increases. The deactivation duration of the first deactivation stage is determined according to the change trend of the charging impedance curve. When the change trend of the charging impedance curve rises, the deactivation duration of the first deactivation stage increases, and when the change trend of the charging impedance curve decreases, the charging duration of the deactivation duration of the first deactivation stage decreases. The second charging strategy configures the second charging stage and the second passivation stage to be executed alternately, and the second charging strategy includes the charging rate and charging duration of the second charging stage, and the passivation rate and passivation duration of the second passivation stage; The charging time of the second charging stage is determined according to the changing trend of the charging impedance curve. If the changing trend of the charging impedance curve increases, the charging time of the second charging stage decreases; if the changing trend of the charging impedance curve decreases, the charging time of the second charging stage increases. The passivation duration of the second passivation stage is determined according to the changing trend of the charging impedance curve. When the changing trend of the charging impedance curve rises, the passivation duration of the second passivation stage increases; when the changing trend of the charging impedance curve falls, the charging duration of the passivation duration of the second passivation stage decreases.

8. A battery charging device, characterized in that: include: A determination module, configured to determine a charging impedance curve corresponding to the current charging of the rechargeable battery in response to a charging instruction of the rechargeable battery; A monitoring module, used for obtaining the real-time impedance of the rechargeable battery and determining that the real-time impedance is in an impedance interval corresponding to the charging impedance curve; The determining that the real-time impedance is in the impedance interval corresponding to the charging impedance curve includes: obtaining the impedance maximum value of the charging impedance curve; determining, according to the impedance maximum value and the real-time impedance, the impedance interval corresponding to the charging impedance curve, the real-time impedance is greater than 60% of the impedance maximum value, the real-time impedance corresponds to the high impedance interval, and the real-time impedance is less than 60% of the impedance maximum value, the real-time impedance corresponds to the low impedance interval; A charging module is used to determine the current charging strategy of the rechargeable battery according to the impedance interval corresponding to the real-time impedance, and charge the rechargeable battery with the current charging strategy. The real-time impedance of the rechargeable battery corresponds to a high impedance interval, and the current charging strategy is determined to be a first charging strategy, and the charging rate of the first charging strategy is -0.2C-0.2C; the real-time impedance of the rechargeable battery corresponds to a low impedance interval, and the current charging strategy is determined to be a second charging strategy, and the charging rate of the second charging strategy is 0.5C-5C; and when the impedance interval corresponding to the real-time impedance of the rechargeable battery changes, the current charging strategy is adjusted in real time to charge the rechargeable battery with the current charging strategy adjusted in real time.

9. A charging device, characterized in that: The charging device comprises: a power supply device and a controller; Wherein, the power supply device is used to charge the rechargeable battery; The controller includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery charging method described in any one of claims 1-7.

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