WO2023044874A1

WO2023044874A1 - Method and device for determining display state of charge, and battery management chip

Info

Publication number: WO2023044874A1
Application number: PCT/CN2021/120794
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: CN116323288A

Abstract

Provided are a method and device for determining display state of charge, and a battery management chip, which relate to the field of battery management. In the method, the actual voltage of an ith system battery cell in a target battery pack at current moment k, a charging cut-off voltage of the ith system battery cell, and the actual voltage at a previous moment k-1 are obtained; 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 a fully charged display state of charge of the target battery pack, the display state of charge of the ith system battery cell in the target battery pack in an (n+1)th display cycle is determined; and according to the display state of charge of all system battery cells in the target battery pack in an (n+1)th display cycle, the display state of charge of the target battery pack in the (n+1)th display cycle is determined. Furthermore, determining the display state of charge of a multi-system battery pack may reduce jumping of the display state of charge.

Description

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

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 this 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 i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, where i is a positive integer and less than or equal to I, I is the type and quantity of the positive electrode material of the battery in the target battery pack, the current moment k is any moment in a time interval where the end moment of the nth display cycle is located, and the previous moment k- 1 is any moment in a time interval where the end moment of the n-1th display period 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 pack is fully charged to display the state of charge, and determine the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle;

Determine the displayed state of charge of the target battery pack in the (n+1) display cycle according to the displayed state of charge of all system cells in the target battery pack in the (n+1) display cycle.

In the above implementation, the displayed state of charge of each system cell in the multi-system battery pack can be calculated separately, and then the displayed charge state of the target battery pack as a whole can be determined to realize the consideration of each system The influence of the state of charge of the battery core on the whole makes the determined display state of charge 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 displayed state of charge of the target battery pack and the fully charged display state of charge of the target battery pack are determined to determine the displayed state of charge of the i-th system cell in 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 the target battery pack, and determine the display state of charge of the i-th battery cell in the target battery pack in the n+1th display cycle.

In the above implementation method, the filter algorithm can be restarted to determine the display state of charge at the end of charging, so as to ease the display 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 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, 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. Furthermore, by targeting different parameters of the battery, different thresholds can be enabled to realize the judgment of the parameters, which can better meet the judgment needs of the battery and pass the accuracy of the terminal judgment.

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 i-th battery cell in the target battery pack in the n+1th display cycle.

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

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

Among them, SOC(n+1) _i represents the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle; SOC(n) _i represents the i-th system in the target battery pack The display state of charge of the battery cell in the nth display cycle; SOCend represents the full charge display state of charge of the target battery pack; F() represents the preset filtering algorithm; F(V(n+1) _i ) represents the The fitting voltage of the i-th battery cell in the target battery pack at the n+1 display cycle; F(V(n+1) _i ) means that the i-th system battery cell in the target battery pack is at the n+1th The fitting voltage of display cycle; F(Vend) represents the fitting cut-off voltage of the target battery pack; V(n+1) _i represents the n+1th display of the i-th system cell in the target battery pack The actual voltage at the beginning of the cycle; Vn _i represents the actual voltage of the i-th battery cell in the target battery pack at the beginning of the nth display cycle; Vend represents the charging cut-off voltage of the target battery pack.

In the above embodiment, when determining the display state of charge of the n+1th display cycle, a filtering algorithm can be preset to realize the correction of the display SOC, and the display state of charge viewed by the user in the n+1th display cycle more precise.

In a possible implementation manner, according to the displayed state of charge of all system cells in the target battery pack in the n+1 display cycle, determine the state of charge of the target battery pack in the n+1 display cycle Displays the state of charge, including:

According to the displayed state of charge of all system cells in the target battery pack in the n+1th display cycle, determine the maximum displayed state of charge in the target battery pack and the minimum displayed charge in the target battery pack power state;

The displayed state of charge of the target battery pack in the n+1th cycle is determined according to the maximum displayed state of charge and the minimum displayed state of charge.

In the above implementation manner, only the minimum displayed state of charge and the maximum displayed state of charge can be used to calculate the displayed state of charge of the target battery pack as a whole, which can reduce the amount of calculation. In addition, since the minimum displayed state of charge and the maximum displayed state of charge are included in the calculation, the calculated displayed state of charge can be closer to the actual state of charge of the target battery pack.

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

PackDispSOC(n+1)=minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100%;

Among them, PackDispSOC(n+1) is the display state of charge of the target battery pack in the n+1th display cycle; minDispSOC is the minimum display state of charge in the target battery pack; maxDispSOC is the target battery pack The maximum in shows the state of charge.

In a possible implementation manner, the determining the displayed state of charge of the target battery pack in the n+1th cycle according to the maximum displayed state of charge and the minimum displayed state of charge includes:

When the maximum displayed state of charge is greater than a first specified value, the maximum displayed state of charge is determined as the displayed state of charge of the target battery pack in the n+1th cycle;

When the minimum displayed state of charge is greater than a second specified value, the minimum displayed state of charge is determined as the displayed state of charge of the target battery pack in the n+1th cycle.

According to the displayed state of charge of all system cells in the target battery pack in the n+1th display cycle and the reliability values corresponding to each system cell, determine the target battery pack in the n+1th cycle display state of charge.

In the above-mentioned implementation, the influence of the cells of each system on the battery pack as a whole can be combined, and the reliability value can be added to calculate the displayed state of charge of the overall battery pack, which can make the determined displayed state of charge more accurate.

In a possible implementation manner, the acquisition of the actual voltage of the i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, include:

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 i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, 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 i-th system cell in the target battery pack at the current moment k, and the charging cut-off of the i-th system cell voltage and the actual voltage of k-1 at the previous moment.

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 provides a device for determining and displaying the state of charge, including:

An acquisition module, configured to acquire the actual voltage of the i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, where i is positive Integer, and less than or equal to 1, I is the number of types of battery positive electrode materials in the target battery pack, the current moment k is any moment in a time interval where the end moment of the nth display cycle is located, the The previous moment k-1 is any moment in a time interval where the end moment of the n-1th display period is located;

The first determination module is configured to, 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 displayed charge of the target battery pack at the previous moment k-1 The state of charge and the full charge of the target battery pack are displayed to determine the state of charge of the i-th battery cell in the target battery pack in the n+1th display cycle;

The second determination module is used to determine the display charge of the target battery pack in the n+1 display cycle according to the display charge states of all system cells in the target battery pack in the n+1 display cycle state.

In the third aspect, the embodiment of the present application also provides a battery management chip, including: including a processor and a memory, the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor , to run the above method.

In the fourth aspect, the embodiment of the present application also 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 above-mentioned Methods.

In a fifth aspect, the embodiment of the present application further provides a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned method is executed.

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

FIG. 4 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. 5 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, acquire the actual voltage of the i-th battery cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th battery cell, and the actual voltage at the previous time k-1.

Wherein, i is a positive integer, and is less than or equal to 1, and I is the type quantity of the positive electrode material of the battery in the target battery pack, and the current moment k is any moment in a time interval where the end moment of the nth display cycle is located , the previous time k-1 is any time in a time interval where the end time of the n-1th display period is located.

In this embodiment, the target battery pack may include multiple batteries of different systems, and the positive electrode materials of each system of batteries are different.

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 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 battery pack’s Fully charged display state of charge, determine the display state of charge of the i-th battery cell in the target battery pack in the n+1 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 The status and the full charge of the target battery pack display the state of charge, and determine the display state of charge of the i-th battery cell in the target battery pack in the n+1 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.

Step 130, according to the displayed state of charge of all system cells in the target battery pack at the n+1 display cycle, determine the display charge state of the target battery pack at the n+1 display cycle.

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 may first be judged whether the target battery pack is in the end-of-charging state. If the target battery pack is in the end-of-charging state, according to the actual voltage at the current moment k, the actual voltage at the previous moment k-1, the The charging cut-off voltage, the display state of charge of the target battery pack at the previous moment k-1 and the full charge display state of charge of the target battery pack, determine the i-th system cell in the target battery pack at the n+th 1 display cycle display state of charge.

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 determined.

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:

Among them, SOC(n+1) _i represents the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle; SOC(n) _i represents the i-th system cell in the target battery pack Display the state of charge in the nth display cycle; SOCend represents the fully charged state of charge of the target battery pack; F() represents the preset filtering algorithm; F(V (n+1) _i ) represents the target battery pack The fitted voltage of the i-th system cell in the n+1 display cycle; F(V(n+1) _i ) represents the fitted voltage of the i-th system cell in the n+1 display cycle in the target battery pack F(Vend) represents the fitting cut-off voltage of the target battery pack; V(n+1) _i represents the actual voltage of the i-th battery cell in the target battery pack at the beginning of the n+1 display period ; Vn _i represents the actual voltage of the i-th battery cell in the target battery pack at the beginning of the nth display cycle; 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 (F(V(n+1) _i )-F(Vn _i ))/(F(Vend)-F(Vn _i )) is a gradually increasing value, further, based on the (F(V(n+1) _i )-F(Vn _i ))/(F(Vend)-F(Vn _i )) determined Adjacent two display state of charge changes to better identify gradual changes in display state of charge.

Among them, through the function of the preset filtering algorithm, the difference between F(V(n+1) _i ) and F(Vn _i ) becomes larger, so that F(V(n+1) _i ) and F(Vn _i ) The difference also becomes larger, which can highlight the change of the state of charge of two adjacent display cycles, so as to better represent the state of charge of each display cycle, thereby reducing the jump of the display state of charge.

In an optional implementation manner, step 130 may use the following steps, as shown in FIG. 3 , to determine the displayed state of charge of the target battery pack in the n+1th cycle.

Step 310, according to the displayed state of charge of all system cells in the target battery pack at the n+1 display cycle, determine the maximum displayed state of charge in the target battery pack and the minimum displayed charge in the target battery pack. power state.

Exemplarily, the values of the displayed state of charge of each system battery cell calculated in step 120 can be compared, and the smallest displayed state of charge and the largest displayed state of charge of all the system cells can be screened out.

Step 320: Determine the displayed SOC of the target battery pack in the n+1th cycle according to the maximum displayed SOC and the minimum displayed SOC.

In an optional implementation manner, the displayed state of charge of the target battery pack in the n+1th cycle may be determined by the following formula:

PackDispSOC(n+1)=minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100%;

Among them, PackDispSOC(n+1) is the display state of charge of the target battery pack in the n+1th display cycle; minDispSOC is the minimum display state of charge in the target battery pack; minDispSOC(n+1) is the target battery pack The minimum display state of charge in the n+1th display cycle in the package; maxDispSOC is the maximum display state of charge in the target battery pack; maxDispSOC(n+1) is the n+1th display in the target battery pack The minimum display state of charge for the display cycle.

In an optional implementation manner, when the maximum displayed SOC is greater than the first specified value, the maximum displayed SOC is determined as the displayed SOC of the target battery pack in the n+1th cycle.

The first designated value can be set as required.

Optionally, the first value may be a numerical value within a range defined by the middle value of the value range of the state of charge. For example, if the range defined by the middle value is (45%, 65%), then the first specified value may be 45%, 50%, 60%, 65% and so on.

Optionally, the first value may be a numerical value within a range defined by a larger value of the value range of the state of charge. For example, the larger value may be 80%, and the range defined by the larger value is (70%, 81%), then the first specified value may be 70%, 73%, 75%, 81% and so on.

In an optional implementation, when the minimum displayed state of charge is greater than the second specified value, the minimum displayed state of charge is determined as the displayed state of charge of the target battery pack in the n+1th cycle

The second specified value can be set as required.

Optionally, the second value may be a numerical value within a range defined by a smaller value of the value interval of the state of charge. For example, the smaller value may be 20%, and the range defined by the larger value is (15%, 25%), then the first specified value may be 15%, 18%, 20%, 25% and so on.

In an optional implementation, according to the display state of charge of all system cells in the target battery pack in the n+1th display cycle and the corresponding reliability values of each system cell, it is determined that the target battery pack is The state of charge of the n+1th cycle is displayed.

Wherein, the reliability values of cells of each system may be the same or different.

Exemplarily, if the reliability values of the cells of each system are the same, the displayed state of charge of the target battery pack in the n+1th cycle can be expressed as:

PackDispSOC(n+1) = Σ _i DSOC(n+1) _i /I;

Wherein, the value range of i is 1 to 1, and I is the type quantity of the positive electrode material of the battery in the target battery pack;

PackDispSOC(n+1) is the display state of charge of the target battery pack in the n+1th display cycle;

DSOC(n+1) _i is the display state of charge of the i-th system cell in the n+1 display cycle.

PackDispSOC(n+1)＝Σ _i K _i *DSOC(n+1) _i ;

Wherein, the value range of i is 1 to 1, and I is the type quantity of the positive electrode material of the battery in the target battery pack; PackDispSOC(n+1) is the display charge of the n+1 display cycle of the target battery pack state; K _i is the reliability value of the i-th system cell.

Optionally, the sum of the I-item reliability values K _i may be equal to one.

Wherein, the reliability value of each system battery cell can be determined according to the display charge state distribution of each system battery cell at the n+1th display cycle.

Exemplarily, the reliability value of the system cell corresponding to the display state of charge with the smaller difference of the average display state of charge is larger, and the reliability value of the display state of charge corresponding to the larger difference of the average display state of charge is The smaller the reliability value of the system cell is. Wherein, the average display state of charge represents the average value of the display state of charge of the nth display period of item I.

For example, |A1-DSOC(n+1) _i |>|A1-DSOC(n+1) _j |, then K _i is smaller than K _j .

Among them, A1 is the value of the average display state of charge, DSOC(n+1) _i is the display state of charge of the i-th system cell in the n+1 display cycle; DSOC(n+1) _j is the j-th The display state of charge of the system battery in the n+1th display cycle.

Exemplarily, the display charge state of the I item nth display cycle of the I item system cell can be divided into multiple numerical intervals, and the display charge state of the I item system cell in the n display cycle falls into The number in the numerical interval determines the reliability value of the system cell.

For example, the value range of the display state of charge of the nth display period of the item I of the battery cell of the item I system is 42% to 54%. Then 42% to 54% can be divided into three numerical intervals, respectively: [42%, 46%], (46%, 50%], (50%, 54%]. The value of I is 10, and I The number of battery cores of the item system in the interval [42%, 46%] in the display state of charge of the nth display cycle is 7, and the battery cell of the item system is in ( The number in the interval of 46%, 50%] is 1, and the number of cells in the item I system in the interval of (50%, 54%] in the display state of charge of the nth display cycle is 2.

In the above example, the reliability value of the system cell whose display state of charge of the item I system cell in the nth display cycle falls into the numerical interval [42%, 46%] can be set to the maximum value, which can be The confidence value of the system battery core whose display state of charge falls into the numerical interval (46%, 50%] in the nth display cycle of the I item system battery core is set to the minimum value, and the I item system battery core can be The reliability value of the system cell whose displayed state of charge falls within the value interval (46%, 50%] in the nth display cycle is set to the next largest value.

In an optional implementation manner, step 130 may determine the displayed state of charge of the target battery pack in the n+1th cycle through the following steps.

According to the display state of charge of all system cells in the target battery pack in the n+1 display cycle, determine the second largest display state of charge in the target battery pack and the second smallest display in the target battery pack state of charge. Then, the displayed state of charge of the target battery pack in the n+1th cycle is determined according to the second largest displayed state of charge and the second smallest displayed state of charge.

In this embodiment, before step 110, the state of charge of the target battery pack can also be judged, and when the state of charge of the target battery pack satisfies the conditions, the method of step 110, step 120, and step 130 can be 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 performing step 110 , and step 120 and step 130 , 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 a specified value, 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.

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 step 110, step 120, and step 130 to determine the displayed charge of the target battery pack. state of charge; 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, and the displayed state of charge of the target battery pack can be determined as a fully charged state, and the end Execution of step 110, and steps 120 and 130.

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, step 110, and step 120 and step 130 are performed to determine the display state of charge of the target battery pack; the charging mark currently recorded in the battery management system is When the value is the second value, the determination of the displayed state of charge can be stopped, the displayed state of charge of the target battery pack can be determined as a fully charged value, and the execution of step 110, step 120 and step 130 can be ended.

In this embodiment, before step 110, the state parameters of the embodiment of the target battery pack can also be judged, and when the state parameters of the target battery pack meet the conditions, then use the methods of step 110, step 120 and step 130 to determine and display the charge state. 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.

Referring to FIG. 4 , the present application also provides a device for determining and displaying a 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 410 , a first determining module 420 and a second determining module 430 .

The obtaining module 410 is used to obtain the actual voltage of the i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, where i is positive Integer, and less than or equal to 1, I is the number of types of battery positive electrode materials in the target battery pack, the current moment k is any moment in a time interval where the end moment of the nth display cycle is located, the previous moment k-1 is any moment in a time interval where the end moment of the n-1th display period is located;

The first determination module 420 is configured to, 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 displayed state of charge of the target battery pack at the previous moment k-1 and The target battery pack is fully charged to display the state of charge, and determine the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle;

The second determining module 430 is configured to determine the display state of charge of the target battery pack in the n+1 display cycle according to the display state of charge of all system cells in the target battery pack in the n+1 display cycle .

In a possible design solution, the first determining module 420 includes: a state judging unit and a state determining unit.

A state judging unit, used to judge whether the target battery pack is in the end-of-charging state;

The state determining unit is used to, if the target battery pack is in the end-of-charging state, 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 previous moment k of the target battery pack The display state of charge of -1 and the fully charged display state of charge of the target battery pack determine the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle.

In a possible design solution, the state judging unit is used for:

Determine 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 the preset range;

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

In a possible design solution, the state judging unit is used for:

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 threshold, It means that the state parameter corresponding to the target battery pack is within the preset range.

In a possible design solution, the first determining module 420 is configured to:

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

Among them, SOC(n+1) _i represents the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle; SOC(n) _i represents the i-th system cell in the target battery pack The display state of charge in the nth display cycle; SOCend represents the full charge display state of charge of the target battery pack; F() represents the preset filtering algorithm; F(V(n+1) _i ) represents the target battery pack The fitted voltage of the i-th system cell in the n+1 display cycle; F(V(n+1) _i ) represents the fitted voltage of the i-th system cell in the n+1 display cycle in the target battery pack F(Vend) represents the fitting cut-off voltage of the target battery pack; V(n+1) _i represents the actual voltage of the i-th battery cell in the target battery pack at the beginning of the n+1 display period ; Vn _i represents the actual voltage of the i-th battery cell in the target battery pack at the beginning of the nth display cycle; Vend represents the charging cut-off voltage of the target battery pack.

In a possible design solution, the second determining module 430 is configured to:

Determine the maximum displayed state of charge in the target battery pack and the minimum displayed state of charge in the target battery pack according to the displayed state of charge of all system cells in the target battery pack at the n+1 display cycle;

According to the maximum displayed SOC and the minimum displayed SOC, the displayed SOC of the target battery pack in the n+1th cycle is determined.

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

PackDispSOC(n+1)=minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100%;

Among them, PackDispSOC(n+1) is the display state of charge of the target battery pack in the n+1th display cycle; minDispSOC is the minimum display charge state of the target battery pack; maxDispSOC is the maximum display state of charge of the target battery pack Displays the state of charge.

When the maximum displayed state of charge is greater than the first specified value, determine the maximum displayed state of charge as the displayed state of charge of the target battery pack in the n+1th cycle;

When the minimum displayed SOC is greater than the second specified value, the minimum displayed SOC is determined as the displayed SOC of the target battery pack in the n+1th cycle.

According to the displayed state of charge of all system cells in the target battery pack in the n+1 display cycle and the corresponding reliability values of each system cell, determine the display charge of the target battery pack in the n+1 cycle power state.

In a possible design solution, the obtaining module 410 is used to:

Obtain 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 charging mark;

In a possible design solution, the obtaining module 410 is used to:

Judging whether the maximum cell terminal voltage among the actual voltages at the current moment k is less than the 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 i-th system cell in the target battery pack at the current moment k, the charging cut-off voltage of the i-th system cell and The actual voltage of k-1 at the previous moment.

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 510, such as a CPU, at least one communication interface 520 , at least one memory 530 and at least one communication bus 540 . Wherein, the communication bus 540 is used to realize the direct connection and communication of these components. Wherein, the communication interface 520 of the device in the embodiment of the present application is used for signaling or data communication with other node devices. The memory 530 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 530 may also be at least one storage device located away from the aforementioned processor. Computer-readable instructions are stored in the memory 530 , and when the computer-readable instructions are executed by the processor 510 , 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 shown 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 i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, where i is a positive integer and less than or equal to I, I is the type and quantity of the positive electrode material of the battery in the target battery pack, the current moment k is any moment in a time interval where the end moment of the nth display cycle is located, and the previous moment k- 1 is any moment in a time interval where the end moment of the n-1th display period 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 pack is fully charged to display the state of charge, and determine the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle;

Determine the displayed state of charge of the target battery pack in the (n+1) display cycle according to the displayed state of charge of all system cells in the target battery pack in the (n+1) display cycle.
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 display state of charge at a time k-1 and the fully charged state of charge of the target battery pack are determined to determine the display charge of the i-th system cell in the target battery pack at the n+1th display cycle. Power status, 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 the target battery pack, and determine the display state of charge of the i-th battery cell in 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 display state of charge of the target battery pack at the previous moment k-1 and the full charge display state of charge of the target battery pack, determine the i-th system cell in the target battery pack at the n+1th Display state of charge for display cycles, 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 i-th battery cell in the target battery pack in the n+1th display cycle.
The method according to claim 5, wherein the display state of charge of the i-th battery cell of the target battery pack in the n+1 display cycle is determined by the following formula:

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

Among them, SOC(n+1) i represents the display state of charge of the i-th system cell in the target battery pack in the n+1 display cycle; SOC(n) i represents the i-th system in the target battery pack The display state of charge of the battery cell in the nth display cycle; SOCend represents the full charge display state of charge of the target battery pack; F() represents the preset filtering algorithm; F(V(n+1) i ) represents the The fitting voltage of the i-th battery cell in the target battery pack at the n+1 display cycle; F(V(n+1) i ) means that the i-th system battery cell in the target battery pack is at the n+1th The fitting voltage of a display cycle;

F(Vend) represents the fitted cut-off voltage of the target battery pack; V(n+1) i represents the actual voltage of the i-th system cell in the target battery pack at the beginning of the n+1 display period; Vn i represents the actual voltage of the i-th battery cell in 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 target battery is determined according to the displayed state of charge of all system cells in the target battery pack in the n+1th display cycle It includes the display state of charge of the n+1th display cycle, including:

According to the displayed state of charge of all system cells in the target battery pack in the n+1th display cycle, determine the maximum displayed state of charge in the target battery pack and the minimum displayed charge in the target battery pack power state;

The displayed state of charge of the target battery pack in the n+1th cycle is determined according to the maximum displayed state of charge and the minimum displayed state of charge.
The method according to claim 7, wherein the displayed state of charge of the target battery pack in the n+1th cycle is determined by the following formula:

PackDispSOC(n+1)=minDispSOC(n+1)/(1-(maxDispSOC(n+1)-minDispSOC(n+1)))*100%;

Among them, PackDispSOC(n+1) is the display state of charge of the target battery pack in the n+1th display cycle; minDispSOC is the minimum display state of charge in the target battery pack; maxDispSOC is the target battery pack The maximum in shows the state of charge.
The method according to claim 7, wherein the displayed charge of the target battery pack in the n+1th cycle is determined according to the maximum displayed state of charge and the minimum displayed state of charge. Power status, including:

When the maximum displayed state of charge is greater than a first specified value, the maximum displayed state of charge is determined as the displayed state of charge of the target battery pack in the n+1th cycle;

When the minimum displayed state of charge is greater than a second specified value, the minimum displayed state of charge is determined as the displayed state of charge of the target battery pack in the n+1th cycle.
The method according to claim 1, characterized in that, according to the display state of charge of all system cells in the target battery pack in the n+1th display cycle, determine the n+th display state of the target battery pack Display state of charge for 1 display cycle, including:

According to the displayed state of charge of all system cells in the target battery pack in the n+1th display cycle and the reliability values corresponding to each system cell, determine the target battery pack in the n+1th cycle display state of charge.
The method according to any one of claims 1-10, wherein the acquisition of the actual voltage of the i-th system cell in the target battery pack at the current moment k, the charging cut-off voltage and The actual voltage of k-1 at the previous moment, 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 i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1.
The method according to any one of claims 1-10, wherein the acquisition of the actual voltage of the i-th system cell in the target battery pack at the current moment k, the charging cut-off voltage and The actual voltage of k-1 at the previous moment, 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 i-th system cell in the target battery pack at the current moment k, and the charging cut-off of the i-th system cell voltage and the actual voltage of k-1 at the previous moment.
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 i-th system cell in the target battery pack at the current time k, the charging cut-off voltage of the i-th system cell, and the actual voltage at the previous time k-1, where i is positive Integer, and less than or equal to 1, I is the number of types of battery positive electrode materials in the target battery pack, the current moment k is any moment in a time interval where the end moment of the nth display cycle is located, the The previous moment k-1 is any moment in a time interval where the end moment of the n-1th display period is located;

The first determination module is configured to, 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 displayed charge of the target battery pack at the previous moment k-1 The state of charge and the full charge of the target battery pack are displayed to determine the state of charge of the i-th battery cell in the target battery pack in the n+1th display cycle;

The second determination module is used to determine the display charge of the target battery pack in the n+1 display cycle according to the display charge states of all system cells in the target battery pack in the n+1 display cycle state.
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 - The method described in any one of 12.
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 1-12. one of the methods described.
A readable storage medium on which a computer program is stored, wherein the computer program runs the method according to any one of claims 1-12 when executed by a processor.