WO2023044875A1

WO2023044875A1 - Method and device for determining display state of charge and battery management chip

Info

Publication number: WO2023044875A1
Application number: PCT/CN2021/120795
Authority: WO
Inventors: 黄磊; 陈晨; 赵微
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2023-03-30
Also published as: CN116648630A

Abstract

The present application provides a method and a device for determining a display state of charge and a battery management chip, which are related to the field of battery management. In the above method, the actual voltage of a target battery pack at current moment k, a charging cut-off voltage of the target battery pack and the actual voltage at previous moment k-1 are acquired, the current moment k being any moment in a time interval in which the end moment of an nth display cycle is located, and the previous moment k-1 being any moment in a time interval in which the end moment of an (n-1)th display cycle is located; and according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, the display state of charge of the target battery pack at the previous moment k-1 and the fully charged display state of charge of the target battery pack, the display state of charge of the target battery pack at an (n+1)th display cycle is determined. By means of the display state of charge determined in the above method, jumps in the display state of charge can be reduced, and the accuracy of displaying the display state of charge can be improved.

Description

Method and device for determining and displaying state of charge and battery management chip

technical field

The present application relates to the field of battery management, in particular, to a method, device and battery management chip for determining and displaying the state of charge.

Background technique

When an electronic device powered by a battery is in use, usually, the display interface of the electronic device will display the SOC of the battery's state of charge (SOC). Displaying the SOC can be used to indicate the current remaining power of the battery, so that the user can charge or discharge the battery.

However, there is often a deviation between the displayed SOC and the actual SOC.

Contents of the invention

The purpose of the present application is to provide a method, device and battery management chip for determining and displaying the state of charge, so as to improve the accuracy of displaying SOC.

In the first aspect, the embodiment of the present application provides a method for determining and displaying the state of charge, including:

Obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1, wherein the current time k is a time at the end of the nth display period. Any moment in the time interval, the previous moment k-1 is any moment in a time interval where the end moment of the n-1th display cycle is located;

According to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charging cut-off voltage, the displayed state of charge of the target battery pack at the previous time k-1 and the target battery The state of charge is displayed when the pack is fully charged, and the display state of charge of the target battery pack in the n+1th display cycle is determined.

In the above method, when the difference between the displayed state of charge of the n+1th display cycle and the displayed state of charge of the nth display cycle is small, if the existing state of charge is determined according to the existing method of determining the state of charge, it may cause the first The displayed state of charge of the n+1 display cycle has a large jump, resulting in inaccurate determination of the value of the displayed state of charge. Therefore, when determining the displayed charge state of the n+1th display cycle, the display can be adjusted With the correction of SOC, the display state of charge that the user watches in the n+1 display cycle is more accurate.

In a possible implementation manner, the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the target battery pack at the previous moment k-1 The display state of charge of the target battery pack and the full charge display state of charge of the target battery pack are determined to determine the display charge state of the target battery pack in the n+1th display cycle, including:

judging whether the target battery pack is in an end-of-charging state;

If the target battery pack is in the charging end state, according to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charging cut-off voltage, and the previous time k-1 of the target battery pack 1 and the fully charged display state of charge of the target battery pack, and determine the display charge state of the target battery pack in the n+1th display cycle.

In the above implementation method, the filter algorithm can be restarted at the end of charging to realize the determination of the displayed state of charge, so as to ease the display of the state of charge at the end of charging and jump to the full charge display state when it is not fully charged.

In a possible implementation manner, the judging whether the target battery pack is in an end-of-charging state includes:

Judging whether the target vehicle equipped with the target battery pack is in the charging state of the gun;

If the target vehicle is in the charging state of the gun, it is judged whether the state parameter corresponding to the target battery pack is within a preset interval;

If the state parameter corresponding to the target battery pack is within a preset range, it means that the target battery pack is in an end-of-charging state.

In the above implementation, whether the battery pack is at the end can be judged from two dimensions: the plugging state of the charging gun and the state parameters of the battery pack itself, which can improve the accuracy of the end judgment.

In a possible implementation manner, the judging whether the state parameter corresponding to the target battery pack is within a preset interval includes:

judging whether the charging current of the target battery pack is less than a first preset threshold;

judging whether the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold;

judging whether the displayed state of charge of the target battery pack is greater than a third preset threshold;

If the charging current of the target battery pack is less than a first preset threshold, the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold, and the displayed state of charge of the target battery pack is greater than a third preset Setting the threshold means that the state parameter corresponding to the target battery pack is within a preset interval.

In the above implementation manner, different thresholds can be enabled for different parameters of the battery to achieve parameter determination, which can better meet the determination requirements of the battery and improve the accuracy of terminal determination.

According to the preset filtering algorithm, the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the displayed state of charge of the target battery pack at the previous moment k-1 and the full charge of the target battery pack to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.

In a possible implementation manner, the display state of charge of the target battery pack in the n+1th display cycle is determined by the following formula:

SOC(n+1)＝SOC(n)+(F(V(n+1))-F(Vn))*(SOC(end)-SOC(n))/(F(Vend)-F(Vn ));

Wherein, SOC(n+1) represents the display state of charge of the target battery pack in the n+1th display cycle;

SOC(n) represents the display state of charge of the target battery pack in the nth display cycle;

SOCend indicates that the full charge of the target battery pack shows the state of charge;

F() indicates the preset filtering algorithm;

F(V(n+1)) represents the fitting voltage of the target battery pack in the n+1th display cycle;

F(Vn) represents the fitting voltage of the target battery pack in the nth display cycle;

F(Vend) represents the fitted cut-off voltage of the target battery pack;

V(n+1) represents the actual voltage at the beginning of the n+1th display period of the target battery pack;

Vn represents the actual voltage of the target battery pack at the beginning of the nth display period;

Vend represents the charging cut-off voltage of the target battery pack.

In the above implementation manner, the above formula can alleviate the situation that the state of charge display jumps during the charging process, and improve the display accuracy of the state of charge display.

In a possible implementation manner, the acquiring the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1 includes:

Obtaining the state of charge data of the target battery pack recorded by the battery management system, where the state of charge data is the current actual state of charge or a charge mark;

If the state of charge data is a specified value, obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1.

In the above implementation, the data recorded by the battery management system is used to determine whether to enable the above-mentioned method for determining and displaying the state of charge to realize the determination of displaying the state of charge, and the determination method of displaying the state of charge can be used in a targeted manner, so that it can be more Accurate implementation shows determination of state of charge.

judging whether the maximum cell terminal voltage among the actual voltages at the current moment k is less than a fourth preset threshold;

If the maximum cell terminal voltage of the actual voltage at the current moment k is less than the fourth preset threshold, obtain the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the previous moment k-1 the actual voltage.

In the above implementation, by first determining the voltage state of the battery, and then enabling the above-mentioned method of determining and displaying the state of charge when the state of the voltage meets the requirements, the determination of the display state of charge can be realized, and the display can be used in a targeted manner. The way to determine the state of charge, so that the determination of the state of charge can be more accurately realized.

In the second aspect, the embodiment of the present application is also a device for determining and displaying the state of charge, including:

An acquisition module, configured to acquire the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1, wherein the current moment k is the nth display cycle Any time in a time interval where the end time is located, the previous time k-1 is any time in a time interval where the end time of the n-1th display cycle is located;

A determining module, configured to display the state of charge of the target battery pack according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the target battery pack at the previous moment k-1 and the full charge of the target battery pack to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.

In a third aspect, the present application also provides a battery management chip, including: a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the operation The method as described in the first aspect of the present application.

In a fourth aspect, an embodiment of the present application provides an electronic device, including a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the operation is as described above The steps in the method provided in the first aspect.

In a fifth aspect, the embodiment of the present application provides a readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps in the method provided in the first aspect above are performed.

Other features and advantages of the present application will be set forth in the ensuing description and, in part, will be apparent from the description, or can be learned by practicing the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that need to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings according to these drawings without creative work.

Fig. 1 is a flow chart 1 of the method for determining and displaying the state of charge provided by the embodiment of the present application;

FIG. 2 is a flow chart of some steps for determining and displaying the state of charge provided by the embodiment of the present application;

FIG. 3 is a block diagram of functional modules of the device for determining and displaying the state of charge provided by the embodiment of the present application;

FIG. 4 is a schematic block diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

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

Explanation of technical terms:

State of charge: State of charge (SOC), the ratio of the remaining capacity of the battery to the capacity of the fully charged state after it has been used for a period of time or left unused for a long time.

Display state of charge: the state of charge of the battery pack displayed on the display screen of the electronic device.

Actual state of charge: the true state of charge of the battery pack.

Terminal voltage: refers to the voltage value at both ends of the cell collected by the power management system.

At present, the way to correct and display the state of charge is: obtain multiple battery operating parameters (such as current, temperature, terminal voltage, etc.) of the battery, and input multiple battery operating parameters into the preset open circuit voltage calculation model to calculate the battery Open circuit voltage, according to the open circuit voltage value, judge whether the display state of charge needs to be calibrated; if so, determine the target calibration coefficient of the battery at the open circuit voltage value and the display state of charge according to the preset calibration table; State of charge calibration. However, the open circuit voltage value calculated according to the open circuit voltage calculation model, for LFP cells, is limited by its model error and cell characteristics, the calculated real state of charge is not accurate enough, resulting in inaccurate displayed state of charge after calibration , there will be phenomena such as uneven and jumping display state of charge calculation speeds, which will affect the user experience.

The defects in the solutions in the above prior art are all the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions to the above problems proposed by the embodiments of the present invention below , should be the inventor's contribution to the invention during the invention process.

The present application provides a method for determining and displaying the state of charge, which is applied to electronic equipment that needs to display the state of charge to the user. Specifically, a battery management system (Battery Management System, BMS for short) may be provided in the electronic device, and the method for determining the displayed SOC of the battery pack provided in this application may be specifically applied to the BMS. Wherein, the electronic device may be, but not limited to, an electronic device powered by a battery pack, such as a smart phone, a tablet computer, and an electric vehicle.

As shown in FIG. 1 , the method for determining the display state of charge provided in the embodiment of the present application may include the following steps.

Step 110, acquiring the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1.

Wherein, the current time k is any time in a time interval where the end time of the nth display cycle is located, and the previous time k-1 is any time in a time interval where the end time of the n-1th display cycle is located .

Exemplarily, the current time k may be the end time of the nth display period, or may be a time before the end time of the nth display period.

Exemplarily, a time interval at which the nth display period ends is a time interval shorter than the display period. For example, the length of the time interval may be one-fifth of the display period, one-tenth of the display period, one-seventh of the display period, one-fifteenth of the display period, and so on.

The current moment k may be located at a critical moment between two adjacent sampling periods, or within any sampling period.

The power management system usually records the relevant parameters of the battery pack, such as charge and discharge status, actual SOC, displayed SOC, actual voltage, etc., in each acquisition time period within a fixed time period. Optionally, but the time length of each parameter acquisition period may be the same or different; the length of the display period and the sampling period may be the same or different.

As a possible implementation manner, the battery management system acquires and records the actual voltage in each sampling period in the sampling period; acquires and records the display SOC in each display period in the display period.

According to specific requirements, the above-mentioned sampling period may be a fixed value during the effective use of the battery pack, and the above-mentioned display period may be a definite value during the effective use of the battery pack. At present, if there are other requirements, the above-mentioned sampling period can also adopt different values in different life stages of the battery pack, and the above-mentioned display period can also adopt different values in different life stages of the battery pack.

Step 120, according to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charging cut-off voltage, the displayed state of charge of the target battery pack at the previous time k-1, and the full charge of the target battery pack State, to determine the display state of charge of the target battery pack in the n+1th display cycle.

Optionally, according to the preset filtering algorithm, the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the displayed charge of the target battery pack at the previous moment k-1 state and the full charge of the target battery pack to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.

Exemplarily, after the preset filtering algorithm, the difference between the fitted voltages of two adjacent display periods used for calculating the display state of charge of the target battery pack in the (n+1)th display period is larger. The fitted voltage can be smaller than the actual voltage or larger than the actual voltage.

In an example, the actual voltage and the fitted voltage can be shown in Table 1 below after the preset filtering algorithm:

Table 1

实际电压(V)Actual voltage (V)	拟合电压(FV)Fitting Voltage (FV)
V0:3.45VV0: 3.45V	33
V0+(Vend-V0)/5:3.49VV0+(Vend-V0)/5:3.49V	4.094.09
V0+2＊(Vend-V0)/5：3.53VV0+2*(Vend-V0)/5: 3.53V	4.614.61
V0+4＊(Vend-V0)/5:3.61VV0+4*(Vend-V0)/5:3.61V	5.195.19
Vend:3.65VVend: 3.65V	5.395.39

Wherein, Table 1 shows the values of the actual voltage and the fitted voltage at five moments. V0 represents the actual voltage at the initial moment using the method for determining and displaying the state of charge in this embodiment; Vend represents the actual voltage of the target battery pack in a fully charged state. Exemplarily, the method for determining the displayed state of charge in this embodiment can be used to determine the displayed state of charge at the end of charging, then the V0 represents the actual voltage at the moment of entering the end of charging.

As a possible implementation manner, the electronic device may acquire the display SOC in the following manner: the electronic device records the display SOC in a memory before each power-off. At the initial moment when the electronic device is powered on, the display SOC recorded before the last power-off of the memory can be read as the display SOC of the first display cycle.

As a possible implementation, it can be judged first whether the target battery pack is in the charging end state. If the target battery pack is in the charging end state, according to the preset filtering algorithm, the actual voltage at the current moment k, and the actual voltage at the previous moment k-1 Voltage, charging cut-off voltage, display state of charge of the target battery pack at k-1 at the previous moment and fully charged display state of charge of the target battery pack, determine the display state of charge of the target battery pack in the n+1th display cycle .

As a possible implementation, it can be determined whether the target battery pack is in the end-of-charging state according to whether the target vehicle where the target battery pack is located is connected to the plug-in charging state of the charging gun, and the value of the state parameter of the target battery pack.

By judging whether the state parameter corresponding to the target battery pack is within the preset interval, if the target vehicle is in the charging state of the gun and the state parameter corresponding to the target battery pack is within the preset interval, it means that the target battery pack is in the charging end state.

Exemplarily, the state parameters of the target battery pack may include: parameters such as charging current, charging voltage, and display state of charge. Different parameters may be judged based on different parameter thresholds.

Optionally, it may be determined whether the state parameter corresponding to the target battery pack is within a preset interval through the process shown in FIG. 2 .

Step 210, judging whether the charging current of the target battery pack is less than a first preset threshold.

As the battery pack is being charged, the charging current gradually decreases. Therefore, the smaller the charging current, the higher the state of charge of the target battery pack can be indicated. Therefore, the above-mentioned first preset threshold can be determined by the charging start current and the charging termination current.

Exemplarily, when the target battery pack just starts charging, the charging start current is denoted as Istart, and when the target battery pack is satisfied, the charging termination current is denoted as Iend.

The first preset threshold can be expressed as: Thi=Istart-(Istart-Iend)*p1. Wherein, the p1 may be a selected critical ratio. The value of p1 can be set according to requirements, for example, the value of p1 can be 96%, 89%, 85%, 80% and so on.

Optionally, the above-mentioned first preset threshold may also be determined through the charge termination current.

The first preset threshold can be expressed as: Thi=Iend*(1+p2). Wherein, the p2 may be a selected critical ratio. The value of p2 can be set according to requirements, for example, the value of p2 can be 5%, 8%, 10%, 7% and so on.

Step 220, judging whether the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold.

As the battery pack is being charged, the voltage of the battery in the target battery pack gradually increases. Therefore, the greater the voltage of the battery, the greater the state of charge of the target battery pack. Therefore, the above-mentioned second preset threshold can be determined by the starting voltage of the battery at the start of charging of the battery and the termination voltage of the battery at the end of charging.

Exemplarily, when the target battery pack starts charging, the starting voltage of the battery is expressed as Vstart, and when the target battery pack is satisfied, the termination voltage of the battery is expressed as Vend.

The second preset threshold can be expressed as: Thv=Vstart+(Vstart-Vend)*p3. Wherein, the p3 may be a selected critical ratio. The value of p3 can be set according to requirements, for example, the value of p3 can be 95%, 87%, 85%, 80%, etc.

Optionally, the above-mentioned second preset threshold may also be determined by the end voltage of the battery at the end of charging.

The second preset threshold can be expressed as: Thv=Vend*p4. Wherein, the p4 may be a selected critical ratio. The value of p4 can be set according to requirements, for example, the value of p4 can be 95%, 87%, 85%, 82% and so on.

Step 230, judging whether the displayed state of charge of the target battery pack is greater than a third preset threshold.

Exemplarily, the displayed state of charge can be used to represent the current charging condition of the target battery pack. The value of the third preset threshold can be determined according to the displayed state of charge in the full charge state, and the value of the third preset threshold can also be determined according to the displayed state of charge in the charging start state and the displayed charge in the full charge state. The power status is confirmed.

For example, when the target battery pack is just starting to charge, the target battery pack is fully charged when it is in an empty state, and the state of charge is represented as SOCzero, and when the target battery pack is fully charged, it is fully charged when it is fully charged. for SOCend.

The third preset threshold can be expressed as: Thsoc=SOCzero+(SOCzero-SOCend)*p5. Wherein, the p5 may be a selected critical ratio. The value of p5 can be set according to requirements, for example, the value of p5 can be 95%, 87%, 85%, 80%, etc.

The third preset threshold can also be expressed as: Thsoc=SOCend*p6. Wherein, the p6 may be a selected critical ratio. The value of p6 can be set according to requirements, for example, the value of p6 can be 95%, 87%, 85%, 80%, etc.

Wherein, if the charging current of the target battery pack is less than the first preset threshold, the maximum cell terminal voltage in the target battery pack is greater than the second preset threshold, and the displayed state of charge of the target battery pack is greater than the third preset threshold, then Indicates that the state parameter corresponding to the target battery pack is within the preset range.

Based on the state parameters of the multi-dimensional target battery pack, the state of the target battery pack is determined, and the state of the target battery pack can be determined more accurately.

Optionally, the displayed state of charge of the target battery pack in the n+1th display cycle can be determined by the following formula:

SOC(n+1)＝SOC(n)+(F(V(n+1))-F(Vn))*(SOC(end)-SOC(n))/(F(Vend)-F(Vn ));

Among them, SOC(n+1) represents the display state of charge of the target battery pack in the n+1 display cycle; SOC(n) represents the display state of charge of the target battery pack in the n display cycle; SOCend represents the target battery pack The battery is fully charged to display the state of charge; F() indicates the preset filtering algorithm; F(V(n+1)) indicates the fitting voltage of the target battery pack in the n+1 display cycle; F(Vn) indicates the target The fitting voltage of the battery pack in the nth display cycle; F(Vend) represents the fitting cut-off voltage of the target battery pack; V(n+1) represents the voltage of the target battery pack at the beginning of the n+1th display cycle Actual voltage; Vn represents the actual voltage of the target battery pack at the beginning of the nth display period; Vend represents the charging cut-off voltage of the target battery pack.

In the above formula, the preset filtering algorithm is performed on the actual voltage to obtain the fitted voltage, so that the value of F(V(n+1))-F(Vn))/(F(Vend)-F(Vn) is A gradually increasing value, further, based on the F(V(n+1))-F(Vn))/(F(Vend)-F(Vn) determined two adjacent display state of charge changes , to better identify gradual changes in the displayed state of charge.

Among them, through the function of the preset filtering algorithm, the difference between F(V(n+1)) and F(Vn) becomes larger, and the difference between F(Vend) and F(Vn) also becomes larger, which can be more The change of the state of charge of two adjacent display periods is highlighted to better represent the state of charge of each display period, thereby reducing the jump of the display state of charge.

In this embodiment, before step 110, the state of charge of the target battery pack may be judged, and when the state of charge of the target battery pack satisfies the conditions, the methods of

steps

110 and 120 are used to determine and display the state of charge. Further, when the state of charge of the target battery pack does not meet the condition, the process of determining the state of charge displayed may end.

In a possible implementation, the data recorded by the battery management system can be used to determine whether the current battery pack needs to be started or terminated. The method for determining and displaying the state of charge in the embodiment of the present application realizes the determination of displaying the state of charge. Before step 110 and step 120 are performed, the charging state data of the target battery pack recorded by the battery management system may be acquired first. If the charging state data currently recorded in the battery management system is the specified value, obtain the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1.

Exemplarily, the state of charge data is the current actual state of charge or a charge mark.

When the state of charge data is the current actual state of charge, the specified value may be a value smaller than the state of full charge in the fully charged state. When the current actual state of charge currently recorded in the battery management system is a value smaller than the value of the fully charged state of charge in the fully charged state, then perform

steps

110 and 120 to determine the displayed state of charge of the target battery pack; When the current actual state of charge currently recorded in the battery management system is a fully charged state of charge, the determination of the displayed state of charge can be stopped, the displayed state of charge of the target battery pack is determined to be fully charged, and step 110 and step 110 are ended. 120 executions.

Exemplarily, the charging flag may include a first value indicating that the target battery pack is not fully charged and a second value indicating that the target battery pack is fully charged. For example, the first value can be 0, and the second value can be 1. When the state of charge data is the current actual state of charge, the specified value may be the first value.

When the charging mark currently recorded in the battery management system is the first value, then execute step 110 and step 120 to determine the displayed state of charge of the target battery pack; when the charging mark currently recorded in the battery management system is the second value , the determination of the displayed state of charge may be stopped, the displayed state of charge of the target battery pack may be determined as a fully charged value, and the execution of step 110 and step 120 may end.

In this embodiment, before step 110, the state parameter of the embodiment of the target battery pack can also be judged, and when the state parameter of the target battery pack satisfies the condition, the method of step 110 and step 120 can be used to determine and display the state of charge. Further, when the state parameter of the target battery pack does not satisfy the condition, the determination process for displaying the state of charge may be ended.

In a possible implementation, the method for determining and displaying the state of charge in the embodiment of the present application can realize the determination of displaying the state of charge by collecting the state parameters of the target battery pack to determine whether the current battery pack needs to be started or terminated.

For example, it can be determined whether the maximum cell terminal voltage among the actual voltages at the current moment k is less than the fourth preset threshold, and if the maximum cell terminal voltage among the actual voltages at the current moment k is less than the fourth preset threshold, obtain the target battery pack The actual voltage at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1.

The fourth preset threshold may be the charging cut-off voltage of the target battery pack.

Determining the displayed state of charge of the target battery pack through the above method can reduce the jump from a smaller displayed state of charge to a displayed charge with a larger gap due to the small gap between the actual voltages. The state of charge value is improving the accuracy of displaying the state of charge.

Please refer to FIG. 3 , the present application also provides a device for determining and displaying the state of charge, which is applied to an electronic device powered by a battery pack in a working state. Specifically, the electronic device includes a battery management system (Battery Management System, BMS for short), and the above method for determining the display SOC of the battery pack can be specifically applied to the BMS. It should be noted that the basic principles and technical effects of the device for determining and displaying the state of charge provided by the embodiment of the present application are the same as those of the above embodiment. Corresponding content in the above-mentioned embodiment. The device for determining and displaying the state of charge includes: an acquiring module 310 and a determining module 320 .

The obtaining module 310 is used to obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1, wherein the current time k is the end of the nth display cycle Any time in a time interval where the time is located, the previous time k-1 is any time in a time interval where the n-1th display cycle ends;

The determining module 320 is configured to use the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, the displayed state of charge of the target battery pack at the previous moment k-1, and the target The battery pack is fully charged to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.

In a possible design solution, the determining module 320 may include: a state judging unit and a charge state determining unit.

A state judging unit for judging whether the target battery pack is in the end-of-charging state;

The state of charge determination unit is used to determine the voltage of the target battery pack according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the cut-off voltage of the charge, and the voltage at the previous moment k-1 of the target battery pack if the target battery pack is in the charging end state. Display the state of charge and the fully charged display state of charge of the target battery pack, and determine the display state of charge of the target battery pack in the n+1th display cycle.

In a possible design scheme, the state judging unit is used to judge whether the target vehicle installed with the target battery pack is in the charging state of the plug-in gun, and if the target vehicle is in the charging state of the plug-in gun, judge whether the state parameters corresponding to the target battery pack are in the preset state. Within the preset interval, if the state parameter corresponding to the target battery pack is within the preset interval, it means that the target battery pack is in an end-of-charging state.

In a possible design scheme, the state judging unit is specifically used to judge whether the charging current of the target battery pack is less than the first preset threshold; judge whether the maximum cell terminal voltage in the target battery pack is greater than the second preset threshold; judge the target Whether the displayed state of charge of the battery pack is greater than the third preset threshold; if the charging current of the target battery pack is less than the first preset threshold, the maximum cell terminal voltage in the target battery pack is greater than the second preset threshold, and the target battery pack The displayed state of charge of is greater than the third preset threshold, which means that the state parameter corresponding to the target battery pack is within the preset range.

In a possible design solution, the determination module 320 is configured to use the preset filtering algorithm, the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, the target The displayed state of charge of the battery pack at the previous moment k-1 and the fully charged displayed state of charge of the target battery pack determine the displayed state of charge of the target battery pack in the n+1th display cycle.

In a possible design scheme, the display state of charge of the target battery pack in the n+1th display cycle is determined by the following formula:

SOC(n+1)＝SOC(n)+(F(V(n+1))-F(Vn))*(SOC(end)-SOC(n))/(F(Vend)-F(Vn ));

In a possible design scheme, the acquisition module 310 can be specifically used to: acquire the charging state data of the target battery pack recorded by the battery management system, where the charging state data is the current actual charging state or charging mark; if the charging state data is a specified value , to obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1.

In a possible design scheme, the acquisition module 310 can be specifically used to: determine whether the maximum cell terminal voltage in the actual voltage at the current moment k is less than the fourth preset threshold; if the maximum cell terminal voltage in the actual voltage at the current moment k is If it is less than the fourth preset threshold, the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1 are obtained.

In addition, the present application also provides a battery management chip, including: a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the operation as described in the above-mentioned embodiments of the present application The method for determining the displayed state of charge in .

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of an electronic device for performing a method for determining and displaying a state of charge provided by an embodiment of the present application. The electronic device may include: at least one processor 410, such as a CPU, at least one communication interface 420 , at least one memory 430 and at least one communication bus 440 . Wherein, the communication bus 440 is used to realize the direct connection and communication of these components. Wherein, the communication interface 420 of the device in the embodiment of the present application is used for signaling or data communication with other node devices. The memory 430 can be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory 430 may also be at least one storage device located far away from the aforementioned processor. Computer-readable instructions are stored in the memory 430 , and when the computer-readable instructions are executed by the processor 410 , the electronic device executes the above-mentioned method process shown in FIG. 1 .

It can be understood that the structure shown in FIG. 4 is only for illustration, and the electronic device may also include more or less components than those shown in FIG. 4 , or have a configuration different from that shown in FIG. 4 . Each component shown in FIG. 4 may be implemented by hardware, software or a combination thereof.

The means may be a module, program segment or code on the electronic device. It should be understood that the device corresponds to the above-mentioned method embodiment in FIG. 1 , and can execute various steps involved in the method embodiment in FIG. 1 . The specific functions of the device can refer to the description above. To avoid repetition, detailed descriptions are appropriately omitted here.

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

An embodiment of the present application provides a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method process performed by the electronic device in the method embodiment shown in FIG. 1 is executed.

This embodiment discloses a computer program product, the computer program product includes a computer program stored on a non-transitory computer readable storage medium, the computer program includes program instructions, when the program instructions are executed by the computer, the computer can execute the above-mentioned The method provided by each method embodiment, for example, includes: acquiring the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1, wherein the current time k is any moment in a time interval where the nth display cycle ends, and the previous moment k-1 is any moment in a time interval where the n-1th display cycle ends; according to the current The actual voltage at time k, the actual voltage at the previous time k-1, the charging cut-off voltage, the display state of charge of the target battery pack at the previous time k-1 and the full charge display state of charge of the target battery pack , to determine the display state of charge of the target battery pack in the n+1th display cycle.

In the embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division method. For example, multiple units or components can be combined or can be Integrate into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, a unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence.

The above is only an embodiment of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A method for determining a display state of charge, comprising:

Obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1, wherein the current time k is a time at the end of the nth display period. Any moment in the time interval, the previous moment k-1 is any moment in a time interval where the end moment of the n-1th display cycle is located;

According to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charging cut-off voltage, the displayed state of charge of the target battery pack at the previous time k-1 and the target battery The state of charge is displayed when the pack is fully charged, and the display state of charge of the target battery pack in the n+1th display cycle is determined.
The method according to claim 1, characterized in that, according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, the previous voltage of the target battery pack The displayed state of charge of the target battery pack at a moment k-1 and the fully charged state of charge of the target battery pack are determined to determine the displayed state of charge of the target battery pack in the n+1th display cycle, including:

judging whether the target battery pack is in an end-of-charging state;

If the target battery pack is in the charging end state, according to the actual voltage at the current time k, the actual voltage at the previous time k-1, the charging cut-off voltage, and the previous time k-1 of the target battery pack 1 and the fully charged display state of charge of the target battery pack, and determine the display charge state of the target battery pack in the n+1th display cycle.
The method according to claim 2, wherein the judging whether the target battery pack is in an end-of-charging state comprises:

Judging whether the target vehicle equipped with the target battery pack is in the charging state of the gun;

If the target vehicle is in the charging state of the gun, it is judged whether the state parameter corresponding to the target battery pack is within a preset interval;

If the state parameter corresponding to the target battery pack is within a preset range, it means that the target battery pack is in an end-of-charging state.
The method according to claim 3, wherein the judging whether the state parameter corresponding to the target battery pack is within a preset interval comprises:

judging whether the charging current of the target battery pack is less than a first preset threshold;

judging whether the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold;

judging whether the displayed state of charge of the target battery pack is greater than a third preset threshold;

If the charging current of the target battery pack is less than a first preset threshold, the maximum cell terminal voltage in the target battery pack is greater than a second preset threshold, and the displayed state of charge of the target battery pack is greater than a third preset Setting the threshold means that the state parameter corresponding to the target battery pack is within a preset interval.
The method according to any one of claims 1-4, characterized in that, according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, the The displayed state of charge of the target battery pack at the previous moment k-1 and the fully charged state of charge of the target battery pack are determined to determine the displayed state of charge of the target battery pack in the n+1th display cycle, including :

According to the preset filtering algorithm, the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the displayed state of charge of the target battery pack at the previous moment k-1 and the full charge of the target battery pack to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.
The method according to claim 5, wherein the display state of charge of the target battery pack in the n+1th display cycle is determined by the following formula:

SOC(n+1)＝SOC(n)+(F(V(n+1))-F(Vn))*(SOC(end)-SOC(n))/(F(Vend)-F(Vn ));

Wherein, SOC(n+1) represents the display state of charge of the target battery pack in the n+1th display cycle;

SOC(n) represents the display state of charge of the target battery pack in the nth display cycle;

SOCend indicates that the full charge of the target battery pack shows the state of charge;

F() indicates the preset filtering algorithm;

F(V(n+1)) represents the fitting voltage of the target battery pack in the n+1th display cycle;

F(Vn) represents the fitting voltage of the target battery pack in the nth display cycle;

F(Vend) represents the fitted cut-off voltage of the target battery pack;

V(n+1) represents the actual voltage at the beginning of the n+1th display period of the target battery pack;

Vn represents the actual voltage of the target battery pack at the beginning of the nth display period;

Vend represents the charging cut-off voltage of the target battery pack.
The method according to any one of claims 1-6, wherein the acquisition of the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1 voltage, including:

Obtaining the state of charge data of the target battery pack recorded by the battery management system, where the state of charge data is the current actual state of charge or a charge mark;

If the state of charge data is a specified value, obtain the actual voltage of the target battery pack at the current time k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous time k-1.
The method according to any one of claims 1-6, wherein the acquisition of the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1 voltage, including:

judging whether the maximum cell terminal voltage among the actual voltages at the current moment k is less than a fourth preset threshold;

If the maximum cell terminal voltage of the actual voltage at the current moment k is less than the fourth preset threshold, obtain the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the previous moment k-1 the actual voltage.
A device for determining and displaying the state of charge is characterized in that it includes:

An acquisition module, configured to acquire the actual voltage of the target battery pack at the current moment k, the charging cut-off voltage of the target battery pack, and the actual voltage at the previous moment k-1, wherein the current moment k is the nth display cycle Any time in a time interval where the end time is located, the previous time k-1 is any time in a time interval where the end time of the n-1th display cycle is located;

A determining module, configured to display the state of charge of the target battery pack according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the charging cut-off voltage, and the target battery pack at the previous moment k-1 and the full charge of the target battery pack to display the state of charge, and determine the display state of charge of the target battery pack in the n+1th display cycle.
A battery management chip, characterized by comprising: a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the operation as claimed in claim 1 -8 The method described in any one of the items.
An electronic device, characterized in that it includes a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, it operates according to any of claims 1-8. one of the methods described.
A readable storage medium on which a computer program is stored, wherein the computer program executes the method according to any one of claims 1-8 when executed by a processor.