SOC estimation method and electronic device based on frozen capacity

Abstract

The present application discloses a method and electronic device for estimating the remaining capacity of a battery based on the State of Charge (SOC) of a frozen capacity. The method includes: obtaining a charge change value and a current remaining capacity value of a rechargeable battery; when the charge change value of the rechargeable battery is greater than or equal to a preset value, obtaining the current operating parameters and the current frozen capacity of the rechargeable battery, wherein the operating parameters include at least the charging state and parameters related to the operating state; obtaining the corresponding theoretical frozen capacity based on the operating parameters; adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and target remaining capacity based on the relative relationship between the current frozen capacity and the theoretical frozen capacity; and estimating the SOC based on the target frozen capacity and the target remaining capacity. The estimation method of the present application can avoid sudden changes in the SOC value by gradually adjusting the frozen capacity and the remaining capacity according to the operating parameters during the SOC estimation, thereby improving the estimation accuracy and transition smoothness of the SOC.

Description

Technical Field

[0001] The present application relates to the field of battery management, and in particular to a SOC estimation method and electronic device based on frozen capacity. Background Art

[0002] Nowadays, lithium batteries, as an important energy storage device, are widely used in various types of electronic devices.

[0003] For electronic devices that use lithium batteries as energy storage devices, in order to ensure that the electronic devices can work normally, it is necessary to regularly test the SOC (State of Charge) of the lithium battery and display the power value as a percentage of the power in the fully charged state so that users can know the remaining power of the electronic device.

[0004] During use, the actual capacity of a lithium battery may change in different environments. For example, low temperatures can easily reduce the actual capacity, resulting in the SOC display failing to reach 100. To make SOC estimation more accurate, it is usually necessary to modify the remaining capacity (Rmc) by referring to the ambient temperature or the voltage / current values ​​during the lithium battery discharge process, or to adjust the rate of change of the charge by adjusting the coefficient in the ampere-hour integration process. This makes the SOC change closer to reality and improves the calculation accuracy of the SOC value.

[0005] However, because the modification is generally performed only after the machine is restarted or in special circumstances, the above modification may easily cause the SOC estimation to jump during the calculation process. Therefore, the SOC estimation is still not accurate enough and the displayed transition smoothness is not good. Summary of the Invention

[0006] The present application provides a SOC estimation method and electronic device based on frozen capacity, which can improve the estimation accuracy and transition smoothness of SOC.

[0007] An embodiment of the present application provides a frozen capacity-based SOC estimation method, which is applied to an electronic device with a rechargeable battery. The method includes:

[0008] Obtaining a charge change value and a current remaining capacity value of the rechargeable battery;

[0009] When the power change value of the rechargeable battery is greater than or equal to a preset value, obtaining current operating parameters and current frozen capacity of the rechargeable battery, wherein the operating parameters at least include a charging state and operating state parameters;

[0010] Obtaining a corresponding theoretical freezing capacity based on the working parameters;

[0011] According to the relative relationship between the current frozen capacity and the theoretical frozen capacity, the current frozen capacity and the current remaining capacity are adjusted to the corresponding target frozen capacity and target remaining capacity;

[0012] The SOC is estimated according to the target frozen capacity and the target remaining capacity.

[0013] In one embodiment, adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity includes:

[0014] If the current frozen capacity is greater than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is released;

[0015] If the current frozen capacity is less than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is frozen.

[0016] In one embodiment, adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity includes:

[0017] If the rechargeable battery is being charged, the current remaining capacity is increased by a power value corresponding to the power change value;

[0018] If the rechargeable battery is being discharged, the current remaining capacity is reduced by a power value corresponding to the power change value.

[0019] In one embodiment, during the adjustment process, if the power change value is 1, the amount of the current remaining capacity increased or decreased relative to the target remaining capacity is x, and the amount of the current frozen capacity released or frozen relative to the target frozen capacity is y;

[0020] If the current rechargeable battery is being charged and the current frozen capacity is greater than the theoretical frozen capacity, or if the current rechargeable battery is being discharged and the current frozen capacity is less than the theoretical frozen capacity, then x=y+1;

[0021] If the current rechargeable battery is discharging and the current frozen capacity is greater than the theoretical frozen capacity, or if the current rechargeable battery is charging and the current frozen capacity is less than the theoretical frozen capacity, then x+y=1.

[0022] In one embodiment, estimating the SOC according to the target frozen capacity value and the target remaining capacity includes:

[0023] If the target frozen capacity is Froc, the fully charged capacity is Fcc, and the target remaining capacity is Rmc, the SOC value is estimated by the calculation formula SOC=Rmc / (Fcc-Froc)*100%.

[0024] In one embodiment, the working status parameter includes at least one of the following:

[0025] The operating voltage, operating current, charging voltage, operating temperature and cycle life of the rechargeable battery.

[0026] In one embodiment, obtaining the corresponding theoretical freezing capacity based on the operating parameters includes:

[0027] Obtaining a mapping table between the working parameters and theoretical freezing capacity;

[0028] The theoretical freezing capacity corresponding to the working parameter is obtained through the mapping table.

[0029] In one embodiment, the mapping table includes at least one of the following:

[0030] A mapping table of the relationship between the discharge current and the frozen capacity obtained based on the discharge current sampling data;

[0031] A mapping table of relationships between full charge states and frozen capacities obtained based on full charge state sampling data;

[0032] A mapping table of the relationship between temperature and freezing capacity obtained from the temperature change sampling data;

[0033] A mapping table showing the relationship between cycle life and frozen capacity or fully charged capacity obtained based on cycle number sampling data.

[0034] In one embodiment, when the change in the charge level of the rechargeable battery is greater than or equal to a preset value, the method includes:

[0035] The difference between the current remaining power and the previous remaining power is greater than or equal to the preset capacity value; or

[0036] The difference between the SOC value at the current moment and the SOC value at the previous moment is greater than or equal to the preset capacity value.

[0037] The present application also discloses an electronic device, comprising:

[0038] processor; and

[0039] A memory, wherein a computer program is stored in the memory, and the processor is configured to execute any one of the above-described SOC estimation methods based on frozen capacity by calling the computer program stored in the memory.

[0040] As can be seen from the above, in the frozen capacity-based SOC estimation method and electronic device of the present application, by obtaining the charge change value of the rechargeable battery, when the charge change value is greater than or equal to a preset value, the theoretical frozen capacity is obtained by obtaining the operating parameters of the rechargeable battery. The current remaining capacity and the current frozen capacity are adjusted based on the relative relationship between the current frozen capacity and the theoretical frozen capacity, thereby using the target frozen capacity and the target remaining capacity to estimate the SOC. By gradually adjusting the frozen capacity and the remaining capacity according to the operating parameters during SOC estimation, the estimation method of the present application can avoid sudden changes in the SOC value, thereby improving the estimation accuracy and transition smoothness of the SOC. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flowchart of an implementation method of the frozen capacity-based SOC estimation method provided in an embodiment of the present application.

[0042] Figure 2 This is a flowchart for adjusting the frozen capacity and remaining capacity provided in an embodiment of the present application.

[0043] Figure 3 This is another implementation flowchart of adjusting the frozen capacity and the remaining capacity provided in an embodiment of the present application.

[0044] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings to make the advantages and features of the present application easier to understand for those skilled in the art, thereby making a clearer definition of the scope of protection of the present application.

[0046] Please refer to the drawings, in which the same component symbols represent the same components. The principles of this application are illustrated by implementing them in an appropriate computing environment. The following description is based on the illustrated specific embodiments of this application and should not be considered as limiting other specific embodiments of this application that are not described in detail herein.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] See also Figure 1 , the figure shows the implementation process of the SOC estimation method based on frozen capacity provided in an embodiment of the present application.

[0049] The frozen capacity-based SOC estimation method is applied to electronic devices with rechargeable batteries, which may be smart phones, portable computers, vacuum cleaners, or other electronic devices that require charging control, or other types of electronic devices, without limitation to the specific type.

[0050] like Figure 1 As shown, the method includes the following steps

[0051] 101. Obtain the charge change value and current remaining capacity value of the rechargeable battery.

[0052] The power change value may be a change value of the remaining capacity or a change value of the SOC, as long as it can reflect the power change.

[0053] 102. When the power change value of the rechargeable battery is greater than or equal to a preset value, obtain the current operating parameters and current frozen capacity of the rechargeable battery.

[0054] The preset value may be a certain power value, for example, 1mah or 10mah is used as the preset value, and the preset value may be determined according to different situations.

[0055] In one embodiment, when the charge change value of the rechargeable battery is greater than or equal to a preset value, it may include: the difference between the remaining charge at the current moment and the remaining charge at the previous moment is greater than or equal to the preset capacity value; or the difference between the SOC value at the current moment and the SOC value at the previous moment is greater than or equal to the preset capacity value.

[0056] Specifically, the last moment may be the moment when the SOC estimation is completed last time, or the moment when the frozen capacity or the remaining capacity is adjusted last time, and its definition may be determined according to circumstances.

[0057] For example, 1mah can be set as the preset value. If the battery is currently in a charging state and the remaining capacity is 2001mah, when the remaining capacity was 2000mah when the SOC estimation was last completed, the difference in power value reaches 1mah. At this time, the current operating parameters and current frozen capacity of the rechargeable battery are obtained, and the current frozen capacity and the current remaining capacity are adjusted. For another example, 0.1% can be set as the preset value. If the battery is currently in a charging state and the SOC value is 50.1%, when the SOC value when the SOC estimation was last completed was 50%, the subsequent operation is performed.

[0058] The operating parameters include at least a charging state and operating state parameters. The charging state may include the charging or discharging state of the rechargeable battery. In one embodiment, the operating state parameters may include the operating voltage, operating current, charging voltage, operating temperature, and cycle life of the rechargeable battery. Of course, other parameters related to the charging or discharging of the rechargeable battery may also be included.

[0059] 103. Obtain corresponding theoretical freezing capacity based on the working parameters.

[0060] The theoretical frozen capacity may be a value obtained by looking up a table of working parameters, and may include the following steps: obtaining a mapping table between working parameters and theoretical frozen capacity; and obtaining the theoretical frozen capacity corresponding to the working parameters through the mapping table.

[0061] The mapping table can be obtained by testing the frozen capacity under preset conditions in advance, collecting the working parameters under different conditions and the corresponding frozen capacity under ideal conditions, thereby obtaining a mapping relationship between the working parameters and the frozen capacity under different preset conditions.

[0062] In one embodiment, the mapping table may include at least one of the following: a mapping table of the relationship between the discharge current and the frozen capacity obtained based on the discharge current sampling data; a mapping table of the relationship between the full charge state and the frozen capacity obtained based on the full charge state sampling data; a mapping table of the relationship between the temperature and the frozen capacity obtained based on the temperature change sampling data; and a mapping table of the relationship between the cycle life and the frozen capacity or the fully charged capacity obtained based on the cycle number sampling data.

[0063] Using the aforementioned mapping table, the obtained operating parameters can be substituted into the aforementioned mapping table to obtain the corresponding theoretical frozen capacity. Furthermore, if multiple operating parameters are collected simultaneously, the frozen capacities obtained from the corresponding mapping tables for these multiple operating parameters can be weighted to obtain a weighted theoretical frozen capacity, further improving the accuracy of the theoretical frozen capacity. It is understood that various methods can be used to obtain the theoretical frozen capacity based on the operating parameters, with the goal of making the theoretical frozen capacity closer to the actual value.

[0064] 104. According to the relative relationship between the current frozen capacity and the theoretical frozen capacity, the current frozen capacity and the current remaining capacity are adjusted to the corresponding target frozen capacity and target remaining capacity.

[0065] Among them, adjusting the target frozen capacity and the target remaining capacity according to the current frozen capacity and the theoretical frozen capacity can help to make the frozen capacity and the remaining capacity approach the actual value, so that by substituting the frozen capacity and the remaining capacity into the SOC estimation, a more accurate SOC value can be estimated.

[0066] In one embodiment, this step may specifically include: if the current frozen capacity is greater than the theoretical frozen capacity, releasing the frozen capacity corresponding to the power change value; if the current frozen capacity is less than the theoretical frozen capacity, freezing the frozen capacity corresponding to the power change value.

[0067] For example, if the charge change is 1 mAh and the current frozen capacity is greater than the theoretical frozen capacity, the current frozen capacity can release 0.5 mAh of capacity during the adjustment process, gradually approaching the theoretical frozen capacity. This minimizes the change in the SOC estimate under different usage environments, minimizing SOC jumps caused by significant environmental changes or excessive frozen capacity adjustments. Furthermore, more accurate frozen capacity estimation can improve SOC estimation accuracy.

[0068] At the same time, the current remaining capacity can also be adjusted based on the relationship between the current frozen capacity and the theoretical frozen capacity. For example, if the current frozen capacity is greater than the theoretical frozen capacity, the frozen capacity needs to be released. At this time, the current remaining capacity value can be adjusted in conjunction with the power change value, thereby adjusting it synchronously with the current remaining capacity, further improving the accuracy of SOC estimation.

[0069] In one embodiment, the current remaining capacity may be adjusted in the following manner:

[0070] If the rechargeable battery is being charged, the current remaining capacity increases by a power value corresponding to the power change value; if the rechargeable battery is being discharged, the current remaining capacity decreases by a power value corresponding to the power change value.

[0071] 105. Estimate SOC based on target frozen capacity and target remaining capacity.

[0072] By obtaining the current frozen capacity and operating parameters, the current remaining capacity and the current frozen capacity are adjusted to obtain a target frozen capacity and a target remaining capacity that are closer to the actual situation of the rechargeable battery. The target frozen capacity and the target remaining capacity are then combined for estimation to obtain a more accurate SOC value.

[0073] In one embodiment, if the target frozen capacity is Froc, the fully charged capacity is Fcc, and the target remaining capacity is Rmc, the SOC value is estimated by the calculation formula SOC=Rmc / (Fcc-Froc)*100%.

[0074] When the power level changes by a certain amount (for example, 1mah), if the operating parameters change, such as temperature changes or the charging current increases, the frozen capacity and remaining capacity can be adjusted in the above manner to fine-tune the SOC estimation, so that the SOC can be closer to the current actual value, thereby avoiding the SOC estimation jump caused by the estimation timing or method in the traditional SOC value correction process, thereby making the SOC estimation more accurate, and because the adjustment is gradual, the excessive smoothness of the SOC display can be improved.

[0075] See also Figure 2 , the figure shows the implementation process of adjusting the frozen capacity and the remaining capacity provided by the embodiment of the present application.

[0076] like Figure 2 As shown, the current frozen capacity and the current remaining capacity are adjusted to the corresponding target frozen capacity and target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity, including:

[0077] 201. If the current power change value reaches 1mah, determine whether the rechargeable battery is being charged.

[0078] By judging the change value of the power, it is possible to determine whether the change value of the remaining capacity reaches 1mah. The change can be judged by retrieving the statistical value of the system, or by using other measurement methods. This application does not limit the actual acquisition and judgment method of the power change value.

[0079] When the power change value reaches 1mah, the process may proceed to determine whether the rechargeable battery is being charged.

[0080] 202. Determine whether the rechargeable battery is being charged.

[0081] Whether the rechargeable battery is being charged can be determined by judging a corresponding flag bit or parameters such as input voltage, and the specific judgment method is not limited.

[0082] If the rechargeable battery is discharging at this time, an adjustment strategy related to battery discharging may be executed.

[0083] 203. If charging is in progress, determine whether the current frozen capacity is greater than the theoretical frozen capacity.

[0084] The current frozen capacity is a parameter related to the frozen capacity obtained in the system, and the theoretical frozen capacity can be obtained based on the operating parameters.

[0085] In one embodiment, a mapping table between the operating parameters and the theoretical freezing capacity may be obtained, and the theoretical freezing capacity corresponding to the operating parameters may be obtained through the mapping table.

[0086] It is understandable that the implementation can refer to Figure 1 The embodiments in the present application will not be described in detail here.

[0087] 204. If the current frozen capacity is greater than the theoretical frozen capacity, the corresponding remaining capacity is increased by xmah, and the corresponding frozen capacity is released by ymah.

[0088] If the current frozen capacity is greater than the theoretical frozen capacity, a certain amount of frozen capacity needs to be released. To make the calculation smoother, you can gradually fine-tune the corresponding parameters. For example, during charging, the theoretical remaining power will increase by 1mah. At this time, because the frozen capacity needs to be released, the change in remaining capacity needs to be adjusted taking into account the value of the frozen capacity release.

[0089] 205. If the current frozen capacity is not greater than the theoretical frozen capacity, the corresponding remaining capacity is increased to xmah, and the corresponding frozen capacity is frozen to ymah.

[0090] If the current frozen capacity is less than the theoretical capacity, it is determined that a certain amount of frozen capacity needs to be frozen. At this time, in order to make the calculation result smoother, the corresponding parameters need to be gradually fine-tuned.

[0091] Of course, if the current frozen capacity is equal to the theoretical frozen capacity, no change is required. Wait until the next power change value reaches 1mah to determine whether the current frozen capacity and the remaining capacity need to be adjusted.

[0092] In this embodiment, if the previous frozen capacity is greater than the theoretical frozen capacity, then x=y+1 can be set; if the current frozen capacity is less than the theoretical frozen capacity, then x+y=1. By proportionally adjusting the corresponding remaining capacity value and frozen capacity value when the power change value is 1mah, a better data smoothing effect can be achieved and the SOC estimation accuracy can be improved. It is understandable that the specific adjustment amount can be adjusted according to the above ratio.

[0093] For example, when x = y + 1, x can be set to 1.5 and y to 0.5; when x + y = 1, x can be set to 0.5 and y to 0.5. Thus, when the set power change is 10 mAh, x is 5 mAh and y is 5 mAh. Of course, the above ratios and the actual power change thresholds can be adjusted based on actual conditions. For example, setting x to 0.4 and y to 0.6 would make the SOC estimate more accurate to the actual situation.

[0094] See also Figure 3 , the figure shows another implementation process of adjusting the frozen capacity and the remaining capacity provided by an embodiment of the present application.

[0095] like Figure 3 As shown, the current frozen capacity and the current remaining capacity are adjusted to the corresponding target frozen capacity and target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity, including:

[0096] 301. If the current power change value reaches 1mah, determine whether the rechargeable battery is discharging.

[0097] By judging the change value of the power, it is possible to determine whether the change value of the remaining capacity reaches 1mah. The change can be judged by retrieving the statistical value of the system, or by using other measurement methods. This application does not limit the actual acquisition and judgment method of the power change value.

[0098] When the power change value reaches 1mah, the process may proceed to determine whether the rechargeable battery is being charged.

[0099] 302. Determine whether the rechargeable battery is discharging.

[0100] Whether the rechargeable battery is discharging can be determined by judging a corresponding flag bit or parameters such as input voltage, and the specific judgment method is not limited.

[0101] If the rechargeable battery is being charged at this time, an adjustment strategy related to battery charging may be executed.

[0102] 303. If discharging is in progress, determine whether the current freezing capacity is greater than the theoretical freezing capacity.

[0103] The current frozen capacity is a parameter related to the frozen capacity obtained in the system, and the theoretical frozen capacity can be obtained based on the operating parameters.

[0104] In one embodiment, a mapping table between the operating parameters and the theoretical freezing capacity may be obtained, and the theoretical freezing capacity corresponding to the operating parameters may be obtained through the mapping table.

[0105] It is understandable that the implementation can refer to Figure 1 The embodiments in the present application will not be described in detail here.

[0106] 304. If the current frozen capacity is greater than the theoretical frozen capacity, the corresponding remaining capacity is reduced to xmah, and the corresponding frozen capacity is released to ymah.

[0107] If the current frozen capacity is greater than the theoretical frozen capacity, a certain amount of frozen capacity needs to be released. To achieve smoother calculation results, you can gradually fine-tune the corresponding parameters. For example, during discharge, the theoretical remaining capacity will decrease by 1mah. At this time, since the frozen capacity needs to be released, the change in remaining capacity needs to be adjusted taking into account the value of the frozen capacity release.

[0108] 305. If the current frozen capacity is not greater than the theoretical frozen capacity, the corresponding remaining capacity is reduced to xmah, and the corresponding frozen capacity is frozen to ymah.

[0109] If the current frozen capacity is less than the theoretical capacity, it is determined that a certain amount of frozen capacity needs to be frozen. At this time, in order to make the calculation result smoother, the corresponding parameters need to be gradually fine-tuned.

[0110] Of course, if the current frozen capacity is equal to the theoretical frozen capacity, no change is required. Wait until the next power change value reaches 1mah to determine whether the current frozen capacity and the remaining capacity need to be adjusted.

[0111] In this embodiment, if the previous frozen capacity is greater than the theoretical frozen capacity, it can be set to x+y=1; if the current frozen capacity is less than the theoretical frozen capacity, then x=y+1. By proportionally adjusting the corresponding remaining capacity value and frozen capacity value when the power change value is 1mah, a better data smoothing effect can be achieved, and the estimation accuracy of SOC can be improved.

[0112] For example, when x = y + 1, x can be set to 1.5 and y to 0.5; when x + y = 1, x can be set to 0.5 and y to 0.5. Thus, when the set power change is 10 mAh, x is 5 mAh and y is 5 mAh. Of course, the above ratios and the actual power change thresholds can be adjusted based on actual conditions. For example, setting x to 0.4 and y to 0.6 would make the SOC estimate more accurate to the actual situation.

[0113] See also Figure 4 , the figure shows the structure of the electronic device provided by the embodiment of the present application.

[0114] like Figure 4 As shown, the electronic device 1 includes a processor 11 and a memory 12, and the processor 11 and the memory 12 are electrically connected;

[0115] The memory 12 stores a computer program, and the processor 11 executes the following steps by calling the computer program stored in the memory 12:

[0116] Obtaining a charge change value and a current remaining capacity value of the rechargeable battery; when the charge change value of the rechargeable battery is greater than or equal to a preset value, obtaining current operating parameters and a current frozen capacity of the rechargeable battery, wherein the operating parameters include at least a charging state and operating state parameters; obtaining a corresponding theoretical frozen capacity based on the operating parameters; adjusting the current frozen capacity and the current remaining capacity to corresponding target frozen capacity and target remaining capacity based on a relative relationship between the current frozen capacity and the theoretical frozen capacity; and estimating the State of Charge (SOC) based on the target frozen capacity and the target remaining capacity.

[0117] In one embodiment, the processor 11 may further be configured to:

[0118] If the current frozen capacity is greater than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is released;

[0119] If the current frozen capacity is less than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is frozen.

[0120] In one embodiment, the processor 11 may further be configured to:

[0121] If the rechargeable battery is being charged, the current remaining capacity is increased by a power value corresponding to the power change value;

[0122] If the rechargeable battery is being discharged, the current remaining capacity is reduced by a power value corresponding to the power change value.

[0123] In one embodiment, the processor 11 may further be configured to:

[0124] During the adjustment process, if the power change value is 1, the amount of the current remaining capacity increased or decreased relative to the target remaining capacity is x, and the amount of the current frozen capacity released or frozen relative to the target frozen capacity is y;

[0125] If the current rechargeable battery is being charged and the current frozen capacity is greater than the theoretical frozen capacity, or if the current rechargeable battery is being discharged and the current frozen capacity is less than the theoretical frozen capacity, then x=y+1;

[0126] If the current rechargeable battery is discharging and the current frozen capacity is greater than the theoretical frozen capacity, or if the current rechargeable battery is charging and the current frozen capacity is less than the theoretical frozen capacity, then x+y=1.

[0127] In one embodiment, the processor 11 may further be configured to:

[0128] If the target frozen capacity is Froc, the fully charged capacity is Fcc, and the target remaining capacity is Rmc, the SOC value is estimated by the calculation formula SOC=Rmc / (Fcc-Froc).

[0129] In one embodiment, the processor 11 may further be configured to:

[0130] Obtaining a mapping table between the working parameters and theoretical freezing capacity;

[0131] The theoretical freezing capacity corresponding to the working parameter is obtained through the mapping table.

[0132] It is understandable that the component models of the processor 11 and the memory 12 can be any model according to the needs, for example, a CPU, MCU, FPGA or ASIC and other computing processing units can be used as the processor 11, and this application does not limit it.

[0133] The electronic device may be an electronic device having a battery cell, such as a smart phone, a portable computer, a vacuum cleaner, or other electronic devices that require SOC value estimation.

[0134] The electronic device can sample the input voltage and input current of the battery cell and the charging device connected thereto through some sampling modules, and provide them to the processing module for estimating the SOC value. For example, a common processing module in the field such as an MCU (Microcontroller Unit), a CPU (Central Processing Unit) or an SOC (System on Chip) can be used. Other chip modules with data processing capabilities such as FPGA modules can also be used. This application does not limit this. After the SOC value is obtained, the SOC value can be displayed to the user through a display device, a speaker or other means, and the display method is not limited.

[0135] The electronic device of the present application obtains the charge change value of a rechargeable battery. When the charge change value is greater than or equal to a preset value, it obtains the operating parameters of the rechargeable battery to obtain the theoretical frozen capacity. The current remaining capacity and the current frozen capacity are adjusted based on the relative relationship between the current frozen capacity and the theoretical frozen capacity, thereby using the target frozen capacity and target remaining capacity to estimate the SOC. By gradually adjusting the frozen capacity and remaining capacity based on the operating parameters during SOC estimation, the estimation method of the present application can avoid sudden changes in the SOC value, improving the estimation accuracy and transition smoothness of the SOC.

[0136] In the embodiment of the present application, the electronic device and the SOC estimation method based on frozen capacity in the above embodiment belong to the same concept. Any method step provided in the embodiment of the SOC estimation method based on frozen capacity can be run on the electronic device. The specific implementation process is detailed in the embodiment of the SOC estimation method based on frozen capacity, and any combination can be used to form an optional embodiment of the present application, which will not be repeated here.

[0137] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present application.

Claims

1. A frozen capacity-based SOC estimation method, applied to electronic devices with rechargeable batteries, characterized in that: The method comprises: Obtaining a charge change value and a current remaining capacity value of the rechargeable battery; When the power change value of the rechargeable battery is greater than or equal to a preset value, obtaining current operating parameters and current frozen capacity of the rechargeable battery, wherein the operating parameters at least include a charging state and operating state parameters; Obtaining a corresponding theoretical freezing capacity based on the working parameters; Adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity includes: during the adjustment process, if the power change value is 1, the amount of the current remaining capacity increased or decreased relative to the target remaining capacity is x, and the amount of the current frozen capacity released or frozen relative to the target frozen capacity is y; if the rechargeable battery is currently charging and the current frozen capacity is greater than the theoretical frozen capacity, or if the rechargeable battery is currently discharging and the current frozen capacity is less than the theoretical frozen capacity, then x=y+1; if the rechargeable battery is currently discharging and the current frozen capacity is greater than the theoretical frozen capacity, or if the rechargeable battery is currently charging and the current frozen capacity is less than the theoretical frozen capacity, then x+y=1; The SOC is estimated according to the target frozen capacity and the target remaining capacity, including: if the target frozen capacity is Froc, the fully charged capacity is Fcc, and the target remaining capacity is Rmc, the SOC value is estimated by the calculation formula SOC = Rmc / (Fcc-Froc)*100%.

2. The SOC estimation method based on frozen capacity according to claim 1, characterized in that: The adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and the target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity includes: If the current frozen capacity is greater than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is released; If the current frozen capacity is less than the theoretical frozen capacity, the frozen capacity corresponding to the power change value is frozen; If the current frozen capacity is equal to the theoretical frozen capacity, the frozen capacity will not be changed.

3. The SOC estimation method based on frozen capacity according to claim 1, characterized in that: The adjusting the current frozen capacity and the current remaining capacity to the corresponding target frozen capacity and the target remaining capacity according to the relative relationship between the current frozen capacity and the theoretical frozen capacity includes: If the rechargeable battery is being charged, the current remaining capacity is increased by a power value corresponding to the power change value; If the rechargeable battery is being discharged, the current remaining capacity is reduced by a power value corresponding to the power change value.

4. The SOC estimation method based on frozen capacity according to any one of claims 1 to 3, characterized in that: The working status parameter includes at least one of the following: The operating voltage, operating current, charging voltage, operating temperature and cycle life of the rechargeable battery.

5. The SOC estimation method based on frozen capacity according to any one of claims 1 to 3, characterized in that: Obtaining a corresponding theoretical freezing capacity based on the working parameters includes: Obtaining a mapping table between the working parameters and theoretical freezing capacity; The theoretical freezing capacity corresponding to the working parameter is obtained through the mapping table.

6. The SOC estimation method based on frozen capacity according to claim 5, characterized in that: The mapping table includes at least one of the following: A mapping table of the relationship between the discharge current and the frozen capacity obtained based on the discharge current sampling data; A mapping table of relationships between full charge states and frozen capacities obtained based on full charge state sampling data; A mapping table of the relationship between temperature and freezing capacity obtained from the temperature change sampling data; A mapping table showing the relationship between cycle life and frozen capacity or fully charged capacity obtained based on cycle number sampling data.

7. The SOC estimation method based on frozen capacity according to any one of claims 1 to 3, characterized in that: When the change in the amount of electricity of the rechargeable battery is greater than or equal to a preset value, the method includes: The difference between the current remaining power and the previous remaining power is greater than or equal to the preset capacity value; or The difference between the SOC value at the current moment and the SOC value at the previous moment is greater than or equal to the preset capacity value.

8. An electronic device, characterized in that: The electronic device comprises: processor; and A memory, wherein a computer program is stored in the memory, and the processor is configured to execute the SOC estimation method based on frozen capacity according to any one of claims 1 to 7 by calling the computer program stored in the memory.

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