Charging strategy setting method and device

Abstract

The application provides a charging strategy setting method and device, and relates to the field of batteries. The charging strategy setting method first acquires a plurality of different battery working parameters of a target battery under a target charging condition and at a target charging rate corresponding to the target charging condition. Then, according to the plurality of different battery working parameters, the maximum charging rate corresponding to each charging duration under the target charging condition is determined, and according to each charging duration under the target charging condition and the maximum charging rate corresponding to each charging duration, the charging strategy under the target charging condition is set. When the target battery is charged under the target charging condition and according to the set charging strategy, the target battery is charged at the maximum charging rate corresponding to each charging duration under the target charging condition. In this way, the charging speed is fast and the charging efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a method and device for setting a charging strategy. Background Art

[0002] Currently, rechargeable batteries are widely used in electronic devices in various fields (such as electric vehicles, mobile phones, handheld computers, etc.) as power supply for electronic devices. When the energy stored in the rechargeable battery is exhausted, the user can recharge the rechargeable battery to extend the battery life of the electronic device. The faster the rechargeable battery is charged, the more time it saves for the user and the better the user experience. However, if the rechargeable battery is charged too quickly, it may be damaged (such as causing lithium deposition in lithium batteries). Therefore, how to ensure that the charging speed of the rechargeable battery is maximized without damaging the rechargeable battery is an unresolved problem. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a charging strategy setting method and device to increase the charging speed of a rechargeable battery.

[0004] In a first aspect, an embodiment of the present application provides a method for setting a charging strategy, the method comprising:

[0005] Obtain multiple different battery cell operating parameters when the target battery cell is charged under the target charging conditions and at the target charging rate corresponding to the target charging conditions; determine the maximum charging rate corresponding to each charging duration under the target charging conditions based on the multiple different battery cell operating parameters; set the charging strategy under the target charging conditions based on each charging duration under the target charging conditions and the maximum charging rate corresponding to each charging duration.

[0006] This charging strategy setting method first obtains multiple different battery cell operating parameters when charging a target battery cell under target charging conditions at a target charging rate corresponding to the target charging conditions. Then, based on the multiple different battery cell operating parameters, the maximum charging rate corresponding to each charging duration under the target charging conditions is determined. A charging strategy is then set for each charging duration under the target charging conditions and the maximum charging rate corresponding to each charging duration. When charging the target battery cell under the target charging conditions using the set charging strategy, the target battery cell is charged at the maximum charging rate corresponding to each charging duration under the target charging conditions. That is, for each charging duration corresponding to the target charging conditions, provided that the anode potential of the target battery cell is not lower than a preset cutoff anode potential, the target battery cell is charged at the maximum charging rate. This results in faster charging speeds and higher charging efficiency.

[0007] In one possible design scheme, in which the target charging conditions include a target SOC range, multiple different battery cell operating parameters may include: a preset cut-off anode potential, the anode potential of the target battery cell at the lower limit of the target SOC range, the current flowing through the target battery cell at the lower limit of the target SOC range, the rate of change of the anode potential of the target battery cell in the current cut-off segment of the target SOC range, and the slope of change of the anode potential of the target battery cell in the current stabilization segment corresponding to the target SOC range with charging time.

[0008] Furthermore, according to a plurality of different battery cell operating parameters, determining the maximum charge rate corresponding to each charging time under the target charging condition may include: according to formula I Z =(Q-kt-V[x,y]A) / B+I X , determine the maximum charge rate corresponding to each charging time under the target charging conditions, where Q is the preset cut-off anode potential, k is the slope of the anode potential of the target cell in the current stable segment corresponding to the target SOC interval with the charging time, t is the charging time, V[x,y]A is the anode potential of the target cell at the lower limit of the target SOC interval, B is the rate of change of the anode potential of the target cell in the current cut-off segment of the target SOC interval, and I X is the current flowing through the target cell at the lower limit of the target SOC range, I Z This is the maximum charge rate.

[0009] In one possible design scheme, before obtaining multiple different battery cell operating parameters when the target battery cell is charged at a target charging rate corresponding to the target charging conditions under the target charging conditions, the method also includes: obtaining the anode potential of the target battery cell when charged at multiple different preset charging rates under the target charging conditions; determining the functional relationship between the change of the anode potential with the preset charging rate under the target charging conditions based on the multiple different preset charging rates and the anode potentials corresponding to the preset charging rates one by one; and determining that the charging rate corresponding to the set critical value of the anode potential is the target charging rate based on the functional relationship between the change of the anode potential with the preset charging rate.

[0010] Since the parameter to be obtained is to determine the maximum charge rate corresponding to each charging duration under the target charging conditions, it is more reliable to obtain multiple different battery cell operating parameters at the charge rate corresponding to the critical value of the anode potential under the target charging conditions (i.e., the maximum charge rate under the target charging conditions) to determine the maximum charge rate corresponding to each charging duration under the target charging conditions.

[0011] Alternatively, in another possible design, the target charging rate is preconfigured.

[0012] In one possible design scheme, after setting the charging strategy under the target charging conditions according to each charging time under the target charging conditions and the maximum charging rate corresponding to each charging time, the method further includes: charging the target battery cell under the target charging conditions according to the charging strategy.

[0013] In a second aspect, an embodiment of the present application further provides a charging method, the method comprising:

[0014] When the target battery cell is in a charging state, determining a target charging condition of the target battery cell;

[0015] Determine a charging strategy based on the target charging conditions, wherein the charging strategy includes: each charging time under the target charging conditions and the maximum charging rate corresponding to each charging time;

[0016] Charge the target cell according to the charging strategy.

[0017] In a third aspect, the present application further provides a charging strategy setting device, the device comprising:

[0018] a parameter acquisition unit, configured to acquire a plurality of different battery cell operating parameters when the target battery cell is charged under a target charging condition and at a target charging rate corresponding to the target charging condition, wherein the target charging condition includes a target SOC range;

[0019] a rate determination unit, configured to determine, based on a plurality of different battery cell operating parameters, a maximum charge rate corresponding to each charging duration under target charging conditions, wherein, when the target battery cell is charged at the maximum charge rate, the anode potential of the target battery cell is not lower than a preset cutoff anode potential;

[0020] The strategy setting unit is used to set the charging strategy under the target charging condition according to each charging time under the target charging condition and the maximum charging rate corresponding to each charging time.

[0021] In a fourth aspect, the present application further provides a charging device, comprising:

[0022] a condition determination unit, configured to determine a target charging condition of the target battery cell when the target battery cell is in a charging state;

[0023] A strategy determination unit, configured to determine a charging strategy based on a target charging condition, wherein the charging strategy includes: each charging duration under the target charging condition and a maximum charging rate corresponding to each charging duration;

[0024] The charging unit is used to charge the target battery cell according to the charging strategy.

[0025] In a fifth aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect above are executed.

[0026] In a sixth aspect, an embodiment of the present application provides a readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the method provided in the first aspect above are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 One of the flow charts of the charging strategy setting method provided in an embodiment of the present application;

[0029] Figure 2 This is a second flowchart of the charging strategy setting method provided in an embodiment of the present application;

[0030] Figure 3 A flowchart of a charging method provided in an embodiment of the present application;

[0031] Figure 4 A functional module block diagram of a charging strategy setting device provided in an embodiment of the present application;

[0032] Figure 5 A functional module block diagram of a charging device provided in an embodiment of the present application;

[0033] Figure 6 This is a structural block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] Explanation of professional terms:

[0035] SOC: State of charge (SOC) is the ratio of a battery's remaining capacity after a period of use or long-term storage to its fully charged capacity. Its value range is 0 to 1. When SOC = 0, the battery is fully discharged, and when SOC = 1, the battery is fully charged.

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0037] Currently, fast charging methods for rechargeable batteries involve determining the cutoff anode potential for each of the battery's multiple SOC ranges and determining a charge rate based on the corresponding cutoff anode potential for each SOC range. Furthermore, the rechargeable battery is charged based on the charge rate corresponding to each SOC range. However, this method of fast charging rechargeable batteries remains relatively slow.

[0038] An embodiment of the present application provides a charging strategy setting method, which is applied to electronic devices powered by target cells. The target cells may be, but are not limited to, rechargeable cells such as lithium iron phosphate cells and lithium nickel cobalt manganese oxide cells. Specifically, the electronic device includes a battery management system (BMS), and the display SOC of the target cell may be determined by the BMS. The electronic device may be, but is not limited to, electronic devices powered by battery packs such as smart phones, tablet computers, and electric vehicles. Figure 1 As shown, the charging strategy setting method includes:

[0039] S21: Acquire a plurality of different battery cell operating parameters when the target battery cell is charged under a target charging condition and at a target charging rate corresponding to the target charging condition.

[0040] The target charging condition includes a target SOC range. In addition, in some examples, the target charging condition may also include an ambient temperature range, a battery temperature range, etc., which are not limited here.

[0041] In some embodiments, multiple battery cell operating parameters may include but are not limited to: the slope of the change of the anode potential of the target battery cell in the current stability segment corresponding to the target SOC range with the charging time, the charging time, the anode potential of the target battery cell at the lower limit of the target SOC range, the rate of change of the anode potential of the target battery cell in the current cutting segment of the target SOC range, and the current flowing through the target battery cell at the lower limit of the target SOC range.

[0042] The above-mentioned multiple battery cell operating parameters can be obtained in the following ways:

[0043] Among them, the slope of the change of the anode potential of the current stable segment corresponding to the target SOC interval with the charging time can be obtained as follows: obtain the anode potential of the current stable segment corresponding to the target SOC interval acquired by the voltage acquisition module and obtain the charging time in the target SOC interval recorded by the timer; according to the anode potential of the current stable segment corresponding to the target SOC interval and the charging time in the target SOC interval, calculate the slope of the change of the anode potential of the current stable segment corresponding to the target SOC interval with the charging time.

[0044] The slope of the change of the anode potential of the target battery cell in the current stability segment corresponding to the target SOC range with the charging time can be obtained in the following way: when the current SOC is at the lower limit value of the target SOC range, the anode potential of the target battery cell collected by the voltage acquisition module can be obtained when the anode potential of the target battery cell is charged to the lower limit value of the target SOC range.

[0045] The rate of change of the anode potential of the target cell in the current cut-off section of the target SOC range can be obtained as follows: obtain the current collected by the current acquisition module, detect whether the current is in the current cut-off section, and if so, obtain the anode potential of the target cell collected by the voltage acquisition module. Based on the charging time and the anode potential, the rate of change of the anode potential of the target cell in the current cut-off section of the target SOC range is calculated.

[0046] The current flowing through the target cell at the lower limit of the target SOC range can be acquired in the following manner: when the current SOC is at the lower limit of the target SOC range, the current flowing through the target cell acquired by the current acquisition module can be acquired.

[0047] In some embodiments, under different target charging conditions, the values ​​of multiple different battery cell operating parameters are different. Assuming that the target charging conditions include different SOC intervals and different ambient temperature intervals, under different SOC intervals and different ambient temperature intervals, the values ​​of the anode potential of the target battery cell at the lower limit of the target SOC interval, the slope of the change of the anode potential of the target battery cell in the current stable segment corresponding to the target SOC interval with the charging time, and the rate of change of the anode potential of the target battery cell in the current cut-off segment of the target SOC interval can be shown in Tables 1 to 3 below, respectively.

[0048]

[0049] Table 1

[0050] It can be understood that in Table 1, T is the ambient temperature, and V is the anode potential of the target battery cell at the lower limit of the target SOC range.

[0051]

[0052] Table 2

[0053] It can be understood that in Table 2, T is the ambient temperature, and K is the slope of the change of the anode potential of the target battery cell in the current stable segment corresponding to the target SOC range with the charging time.

[0054]

[0055] Table 3

[0056] It can be understood that in Table 3, T is the ambient temperature, and B is the rate of change of the anode potential of the target battery cell in the current cutting section of the target SOC range.

[0057] S22: Determine a maximum charging rate corresponding to each charging time under target charging conditions based on a plurality of different battery cell operating parameters.

[0058] Since the aforementioned multiple different battery cell operating parameters are determined when charging at the target charge rate corresponding to the target charging conditions, the multiple different battery cell operating parameters can be used as reference factors to determine the maximum charge rate corresponding to each charging duration under the target charging conditions.

[0059] It can be understood that if the target charging conditions include multiple charging times, then multiple maximum charging rates corresponding to the multiple charging times can be determined. For example, when the target charging conditions include the target SOC range [SOC1, SOC2] and the target temperature range [T1, T2], the multiple charging times in the target temperature range [T1, T2] and the SOC range [SOC1, SOC2] include the time t1-t10. In this way, the maximum charging rate M1 can be determined at time t1; the maximum charging rate M2 can be determined at time t2, and so on, without limitation here. For another example, when the target charging conditions include the target SOC range [SOC2, SOC3] and the target temperature range [T1, T2], the multiple charging times in the target temperature range [T1, T2] and the SOC range [SOC2, SOC3] include the time t11-t20. In this way, the maximum charging rate M11 can be determined at time t11; the maximum charging rate M12 can be determined at time t12, and so on, which is not limited here.

[0060] Among them, when the target battery cell is charged at the maximum charge rate, the anode potential of the target battery cell under each charging time is not lower than the preset cut-off anode potential. It is understandable that if the anode potential of the target battery cell is lower than the preset cut-off anode potential, the target battery cell will be damaged (such as when the target battery cell is a lithium battery cell, it will cause lithium precipitation of the battery cell). Therefore, during the charging process, the upper limit value of the charge rate at which the anode potential of the target battery cell is not lower than the preset cut-off anode potential is the maximum charge rate.

[0061] It should be noted that the above-mentioned target charge rate may be the maximum charge rate corresponding to the target charge condition. When the target cell is charged at the maximum charge rate corresponding to the target charge condition, the anode potential of the target cell must not fall below a preset cutoff anode potential for each charging time corresponding to the target charge condition.

[0062] S23: Setting a charging strategy under the target charging condition according to each charging time under the target charging condition and the maximum charging rate corresponding to each charging time.

[0063] Based on the example in S22 above, the charging strategy set under the target charging conditions may be: when the target charging conditions include the target SOC range [SOC1, SOC2] and the target temperature range [T1, T2], charging is set at the maximum charge rate M1 at time t1, charging at the maximum charge rate M2 at time t2, ..., and charging at the maximum charge rate M10 at time t10. When the target charging conditions include the target SOC range [SOC2, SOC3] and the target temperature range [T1, T2], charging is set at the maximum charge rate M11 at time t11, charging at the maximum charge rate M12 at time t12, ..., and charging at the maximum charge rate M20 at time t20.

[0064] After the charging strategy is determined, the target battery cell under the target charging condition can be charged immediately according to the determined charging strategy, which can realize real-time determination of the charging strategy and real-time charging.

[0065] This charging strategy setting method first obtains multiple different battery cell operating parameters when charging a target battery cell under target charging conditions at a target charging rate corresponding to the target charging conditions. Then, based on the multiple different battery cell operating parameters, the maximum charging rate corresponding to each charging duration under the target charging conditions is determined. A charging strategy is then set for each charging duration under the target charging conditions and the maximum charging rate corresponding to each charging duration. When charging the target battery cell under the target charging conditions using the set charging strategy, the target battery cell is charged at the maximum charging rate corresponding to each charging duration under the target charging conditions. That is, for each charging duration corresponding to the target charging conditions, provided that the anode potential of the target battery cell is not lower than a preset cutoff anode potential, the target battery cell is charged at the maximum charging rate. This results in faster charging speeds and higher charging efficiency.

[0066] In some examples, when the multiple cell operating parameters include: the slope of the change of the anode potential of the target cell in the current stable segment corresponding to the target SOC interval with the charging time, the charging time, the anode potential of the target cell at the lower limit of the target SOC interval, the rate of change of the anode potential of the target cell in the current cut-off segment of the target SOC interval, the current flowing through the target cell at the lower limit of the target SOC interval, and the maximum charging rate, the above-mentioned S22 can be specifically implemented as follows: According to formula I Z =(Q-kt-V [x,y]A ) / B+I X, determine the maximum charging rate corresponding to each charging time under the target charging conditions.

[0067] Among them, Q is the preset cut-off anode potential, k is the slope of the change of the anode potential of the target battery cell in the current stability segment corresponding to the target SOC range with the charging time, t is the charging time, V[x,y]A is the anode potential of the target battery cell at the lower limit of the target SOC range, B is the rate of change of the anode potential of the target battery cell in the current cut-off segment of the target SOC range, IX is the current flowing through the target battery cell at the lower limit of the target SOC range, and IZ is the maximum charging rate.

[0068] In some examples, methods for determining the target charging rate may include but are not limited to the following two:

[0069] The first one: Figure 2 As shown, before S21 , the target charging rate may be determined by the following steps.

[0070] S31: Obtaining the anode potential of the target battery cell when charged at a plurality of different preset charging rates under target charging conditions.

[0071] It can be understood that different preset charge rates correspond to different anode potentials. Assuming that the multiple preset charge rates include C[1,1], C[1,2], and C[1,n-1], then charging the target cell at the preset charge rate C[1,1] results in an anode potential of A[1,1]; charging the target cell at the preset charge rate C[1,2] results in an anode potential of A[1,2]; charging the target cell at the preset charge rate C[1,n-1] results in an anode potential of A[1,n-1], and so on. It can be seen that there is a corresponding relationship between C[1,1] and A[1,1], a corresponding relationship between C[1,2] and A[1,2], and a corresponding relationship between C[1,n-1] and A[1,n-1].

[0072] As shown in Table 4 below, Table 4 shows the corresponding relationship between the value of the preset charging rate and the value of the anode potential under different target charging conditions.

[0073]

[0074] Table 4

[0075] S32: According to a plurality of different preset charging rates and the anode potentials corresponding to the preset charging rates, determining a functional relationship between the anode potential and the preset charging rate under target charging conditions.

[0076] When the target charging conditions include a target SOC range [SOC1, SOC2] and a target temperature range [T1, T2], based on S31, C[1, 1] corresponds to A[1, 1], C[1, 2] corresponds to A[1, 2], and C[1, n-1] corresponds to A[1, n-1]. Furthermore, {C[1, 1], A[1, 1]}, {C[1, 2], A[1, 2]}, {C[1, n-1], A[1, n-1]} can be fitted to obtain a fitted straight line, where the fitted straight line can represent the functional relationship between the anode potential and the preset charge rate under the target charging conditions.

[0077] S33: According to the functional relationship between the anode potential and the preset charging rate, the charging rate corresponding to the set critical value of the anode potential is determined as the target charging rate.

[0078] The critical value of the set anode potential is the lowest anode potential at which the target cell will not be damaged under the target charging conditions. The target charge rate can be obtained by substituting the set anode potential into the functional relationship between the anode potential and the preset charge rate under the target charging conditions. It can be understood that the target charge rate determined at this time is the maximum charge rate at which the target cell will not be damaged under the target charging conditions.

[0079] It can be understood that in the embodiment of the present application, since the parameter that ultimately needs to be obtained is to determine the maximum charge rate corresponding to each charging time under the target charging conditions, it is more reliable to obtain multiple different battery cell operating parameters at the charge rate corresponding to the critical value of the anode potential under the target charging conditions (i.e., the maximum charge rate under the target charging conditions) to determine the maximum charge rate corresponding to each charging time under the target charging conditions.

[0080] In other instances, the target charging rate may also be pre-configured by the manufacturer based on actual needs. For example, the configured target charging rate is less than the maximum charging rate under the target charging conditions; and the difference between the configured target charging rate and the maximum charging rate is less than a preset threshold. It is understandable that the configured target charging rate being less than the maximum charging rate under the target charging conditions can reduce the probability of the target battery cell being damaged during charging. Furthermore, by making the difference between the configured target charging rate and the maximum charging rate less than a preset threshold, the obtained multiple different battery cell operating parameters can be used to determine the reliability of the maximum charging rate corresponding to each charging time under the target charging conditions.

[0081] See also Figure 3, the embodiment of the present application also provides a charging method, which is also applied to electronic devices powered by target battery cells. Among them, the electronic devices can be, but are not limited to, smart phones, tablet computers, electric vehicles and other electronic devices powered by battery packs. When the electronic device is in working state, the display interface of the electronic device lights up, and the display interface includes an icon for indicating the display SOC. Figure 4 As shown, the method includes:

[0082] S41: When the target battery cell is in a charging state, determining a target charging condition of the target battery cell.

[0083] For example, when the target charging conditions include different SOC intervals and different ambient temperature intervals, the ambient temperature around the target cell and the SOC of the target cell are detected. Furthermore, the target charging conditions of the target cell are determined. Specifically, the ambient temperature around the target cell can be collected by a temperature sensor, as well as parameters such as the current temperature, operating conditions, and available power interval of the target cell. The SOC of the target cell can be calculated based on the temperature, operating conditions, and available power interval of the target cell.

[0084] S42: Determine a charging strategy based on the target charging condition.

[0085] Specifically, a one-to-one correspondence between target charging conditions and charging strategies is pre-stored. Once the target charging conditions of the target battery cell are determined, the charging strategy can be found based on the target charging conditions.

[0086] The charging strategy includes: each charging duration under target charging conditions and the maximum charge rate corresponding to each charging duration. The maximum charge rate corresponding to each charging duration under target charging conditions is determined based on multiple different battery cell operating parameters. The specific determination method can be referred to the description of S21-S22 in the above embodiment and will not be detailed here.

[0087] S43: Charging the target battery cell according to the charging strategy.

[0088] The specific charging method can be: for each charging duration under the target charging conditions, the target battery cell will be charged at the maximum charging rate corresponding to the charging duration. In other words, for each charging duration corresponding to the target charging conditions, the target battery cell will be charged at the maximum charging rate under the condition that the anode potential of the target battery cell is not lower than the preset cut-off anode potential. This will result in fast charging speed and high charging efficiency.

[0089] See also Figure 4, the present application also provides a charging strategy setting device 50, which is applied to electronic devices powered by target battery cells. Specifically, the electronic device includes a battery management system BMS, and the above-mentioned method for determining the displayed SOC of the battery pack can be specifically applied to the BMS. Among them, the electronic device can be but is not limited to smart phones, tablet computers, electric vehicles and other electronic devices powered by battery packs. It should be noted that the basic principles and technical effects of the charging strategy setting device 50 for the battery pack provided in the embodiment of the present application are the same as those in the above-mentioned embodiment. For the sake of brief description, for parts not mentioned in this embodiment, please refer to the corresponding content in the above-mentioned embodiment. The device 50 includes a parameter acquisition unit 51, a rate determination unit 52, and a strategy setting unit 53, wherein,

[0090] The parameter acquisition unit 51 is used to acquire a plurality of different cell operating parameters when the target cell is charged under a target charging condition and at a target charging rate corresponding to the target charging condition, wherein the target charging condition includes a target SOC range.

[0091] Among them, multiple different battery cell operating parameters may include but are not limited to: a preset cut-off anode potential, the anode potential of the target battery cell at the lower limit of the target SOC range, the current flowing through the target battery cell at the lower limit of the target SOC range, the rate of change of the anode potential of the target battery cell in the current cut-off segment of the target SOC range, and the slope of the change of the anode potential of the target battery cell in the current stabilization segment corresponding to the target SOC range with charging time.

[0092] The rate determination unit 52 is used to determine the maximum charging rate corresponding to each charging time under the target charging conditions based on multiple different battery cell operating parameters, wherein when the target battery cell is charged at the maximum charging rate, the anode potential of the target battery cell is not lower than the preset cut-off anode potential.

[0093] In an optional embodiment, the magnification determining unit 52 may be specifically configured to determine the magnification according to formula I: Z =(Q-kt-V[x,y]A) / B+I X , determine the maximum charge rate corresponding to each charging duration under the target charging conditions. Where Q is the preset cutoff anode potential, k is the slope of the change of the anode potential of the target cell in the current stable segment corresponding to the target SOC range with the charging duration, t is the charging duration, V[x,y]A is the anode potential of the target cell at the lower limit of the target SOC range, B is the rate of change of the anode potential of the target cell in the current cutoff segment of the target SOC range, IX is the current flowing through the target cell at the lower limit of the target SOC range, and IZ is the maximum charge rate.

[0094] The strategy setting unit 53 is configured to set a charging strategy under the target charging condition according to each charging time under the target charging condition and the maximum charging rate corresponding to each charging time.

[0095] In some embodiments, the target charging rate may be determined by the following units:

[0096] The parameter acquisition unit 51 is further configured to acquire the anode potential of the target battery cell when the target battery cell is charged at a plurality of different preset charging rates under target charging conditions.

[0097] The device 50 may further include: a functional relationship determining unit for determining a functional relationship of the anode potential changing with the preset charging rate under target charging conditions based on a plurality of different preset charging rates and the anode potentials corresponding to the preset charging rates.

[0098] The rate determination unit 53 is further configured to determine the charging rate corresponding to the set critical value of the anode potential as the target charging rate based on the functional relationship between the anode potential and the preset charging rate.

[0099] In other embodiments, the target charge rate is preconfigured.

[0100] In some embodiments, the apparatus 50 may further include:

[0101] The charging unit is used to charge the target battery cell under the target charging condition according to the charging strategy.

[0102] See also Figure 5 The present application also provides a charging device 60, which is applied to an electronic device powered by a target battery cell. Specifically, the electronic device includes a battery management system BMS, and the above-mentioned method for determining the displayed SOC of a battery pack can be specifically applied to the BMS. The electronic device can be, but is not limited to, a smart phone, a tablet computer, an electric car, or other electronic device powered by a battery pack. The device 60 includes a condition determination unit 61, a strategy determination unit 62, and a charging unit 63, wherein,

[0103] The condition determination unit 61 is configured to determine a target charging condition of the target battery cell when the target battery cell is in a charging state.

[0104] The strategy determination unit 62 is configured to determine a charging strategy according to a target charging condition.

[0105] The charging strategy includes: each charging time under the target charging conditions and the maximum charging rate corresponding to each charging time.

[0106] The charging unit 63 is configured to charge the target battery cell according to the charging strategy.

[0107] The defects existing in the solutions in the above-mentioned prior art are the results obtained by the inventor after practice and careful research. Therefore, the process of discovering the above-mentioned problems and the solutions proposed in the embodiments of the present invention below for the above-mentioned problems should all be the contributions made by the inventor to the present invention during the process of the invention.

[0108] Please refer to Figure 6 , Figure 6 A structural diagram of an electronic device for executing a charging strategy setting method or a charging method provided in an embodiment of the present application. The electronic device may include: at least one processor 110, such as a CPU, at least one communication interface 120, at least one memory 130 and at least one communication bus 140. Among them, the communication bus 140 is used to realize direct connection and communication between these components. Among them, the communication interface 120 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 130 can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 130 can optionally also be at least one storage device located away from the aforementioned processor. Computer-readable instructions are stored in the memory 130. When the computer-readable instructions are executed by the processor 110, the electronic device executes the above-mentioned Figure 2 、 Figure 4 The method process shown.

[0109] I understand. Figure 6 The structure shown is only for illustration, and the electronic device may also include Figure 6 More or fewer components than shown, or with Figure 6 Different configurations shown. Figure 6 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0110] The device may be a module, program segment or code on an electronic device. Figure 2 、 Figure 4 The method embodiment corresponds to the embodiment that can be executed Figure 2 、 Figure 4 The various steps involved in the method embodiment and the specific functions of the device can be found in the description above. To avoid repetition, detailed description is appropriately omitted here.

[0111] It should be noted that those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0112] The embodiment of the present application provides a readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the execution is as follows: Figure 2 、 Figure 4 The method process in the illustrated method embodiment is performed by the electronic device.

[0113] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments. For example, it can be performed to obtain a plurality of different battery cell operating parameters when the target battery cell is charged under target charging conditions at a target charging rate corresponding to the target charging conditions, wherein the target charging conditions include a target SOC range; based on the plurality of different battery cell operating parameters, determine the maximum charging rate corresponding to each charging time under the target charging conditions, wherein when the target battery cell is charged at the maximum charging rate, the anode potential of the target battery cell is not lower than a preset cut-off anode potential; and set a charging strategy under the target charging conditions based on each charging time under the target charging conditions and the maximum charging rate corresponding to each charging time.

[0114] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0115] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0116] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0117] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0118] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A charging strategy setting method, characterized in that: The method comprises: Obtaining a plurality of different battery cell operating parameters when a target battery cell is charged under a target charging condition and at a target charging rate corresponding to the target charging condition; Determining a maximum charging rate corresponding to each charging time under the target charging condition according to the multiple different battery cell operating parameters; Setting a charging strategy under the target charging condition according to each charging time under the target charging condition and the maximum charging rate corresponding to each charging time; The target charging condition includes a target SOC interval, and the multiple different battery cell operating parameters include: a preset cut-off anode potential, the anode potential of the target battery cell at the lower limit of the target SOC interval, the current flowing through the target battery cell at the lower limit of the target SOC interval, the rate of change of the anode potential of the target battery cell in the current cut-off section of the target SOC interval, and the slope of change of the anode potential of the target battery cell in the current stable section corresponding to the target SOC interval with charging time; During each charging time corresponding to the target charging condition, the target battery cell is charged at the maximum charging rate under the condition that the anode potential of the target battery cell is not lower than the preset cut-off anode potential.

2. The method according to claim 1, characterized in that The determining, based on the multiple different battery cell operating parameters, a maximum charging rate corresponding to each charging duration under the target charging condition includes: According to the formula IZ=(Q-kt-V[x,y]A) / B+IX, the maximum charging rate corresponding to each charging time under the target charging conditions is determined, wherein Q is the preset cut-off anode potential, k is the slope of the change of the anode potential of the target battery cell in the current stabilization segment corresponding to the target SOC interval with the charging time, t is the charging time, V[x,y]A is the anode potential of the target battery cell at the lower limit of the target SOC interval, B is the rate of change of the anode potential of the target battery cell in the current cut-off segment of the target SOC interval, IX is the current flowing through the target battery cell at the lower limit of the target SOC interval, and IZ is the maximum charging rate.

3. The method according to claim 1, characterized in that Before acquiring a plurality of different battery cell operating parameters when the target battery cell is charged under the target charging condition and at the target charging rate corresponding to the target charging condition, the method further includes: Obtaining the anode potential of the target battery cell when charged at multiple different preset charge rates under target charging conditions; Determining, based on a plurality of different preset charging rates and anode potentials corresponding to the preset charging rates, a functional relationship between the anode potential and the preset charging rate under the target charging condition; According to the functional relationship between the anode potential and the preset charging rate, the charging rate corresponding to the set critical value of the anode potential is determined to be the target charging rate.

4. The method according to claim 1, wherein The target charge rate is preconfigured.

5. The method according to claim 1, wherein After setting a charging strategy under the target charging condition based on each charging time under the target charging condition and the maximum charging rate corresponding to each charging time, the method further includes: According to the charging strategy, the target battery cell is charged under the target charging condition.

6. The method according to claim 1, characterized in that When the target battery cell is charged at the maximum charge rate, the anode potential of the target battery cell is not lower than a preset cut-off anode potential.

7. A charging method, characterized in that: The method comprises: When the target battery cell is in a charging state, determining a target charging condition of the target battery cell; Determining a charging strategy according to the target charging condition, wherein the charging strategy is a charging strategy set by the method according to any one of claims 1 to 6; The target battery cell is charged according to the charging strategy.

8. A charging strategy setting device, characterized in that: The device comprises: a parameter acquisition unit, configured to acquire a plurality of different battery cell operating parameters when a target battery cell is charged under a target charging condition and at a target charging rate corresponding to the target charging condition, wherein the target charging condition includes a target SOC range; a rate determination unit, configured to determine, based on the plurality of different battery cell operating parameters, a maximum charge rate corresponding to each charging duration under the target charging condition, wherein, when the target battery cell is charged at the maximum charge rate, the anode potential of the target battery cell is not lower than a preset cut-off anode potential; a strategy setting unit, configured to set a charging strategy under the target charging condition according to each charging time under the target charging condition and a maximum charging rate corresponding to each charging time; The target charging condition includes a target SOC interval, and the multiple different battery cell operating parameters include: a preset cut-off anode potential, the anode potential of the target battery cell at the lower limit of the target SOC interval, the current flowing through the target battery cell at the lower limit of the target SOC interval, the rate of change of the anode potential of the target battery cell in the current cut-off section of the target SOC interval, and the slope of change of the anode potential of the target battery cell in the current stable section corresponding to the target SOC interval with charging time; During each charging time corresponding to the target charging condition, the target battery cell is charged at the maximum charging rate under the condition that the anode potential of the target battery cell is not lower than the preset cut-off anode potential.

9. A charging device, characterized in that: The device comprises: a condition determination unit, configured to determine a target charging condition of the target battery cell when the target battery cell is in a charging state; a strategy determination unit, configured to determine a charging strategy according to the target charging condition, wherein the charging strategy is a charging strategy set by the method according to any one of claims 1 to 6; A charging unit is used to charge the target battery cell according to the charging strategy.

10. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 7 is executed.

11. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is executed.

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