WO2023044873A1

WO2023044873A1 - Method and apparatus for determining display state of charge, and battery management chip

Info

Publication number: WO2023044873A1
Application number: PCT/CN2021/120793
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: CN116635729A

Abstract

The present application provides a method and apparatus for determining a display state of charge, and a battery management chip, relating to the field of battery management. The method comprises: acquiring an actual state of charge of an i-th system cell in a target battery pack at an m-th sampling period corresponding to a current time k and a display state of charge of the i-th system cell at an n-th display period corresponding to the current time k; determining a rate of change of the display state of charge of the i-th system cell at an (n+1)th display period; determining a display state of charge at an (n+1)th display period of the i-th system cell according to the rate of change of the display state of charge of the i-th system cell at the (n+1)th display period, a confidence compensation coefficient, and the display state of charge of the i-th system cell at the n-th display period; and determining a display state of charge of the target battery pack at the (n+1)th display period according to the display state of charge of each system cell in the target battery pack at the (n+1)th display period.

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, and how the displayed SOC can accurately reflect the actual SOC has become an urgent technical problem in the field of battery management.

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 state of charge of the i-th system cell in the target battery pack in the m-th sampling period corresponding to the current time k and the display charge of the i-th system cell in the n-th display cycle corresponding to the current time k State, the current moment k is the moment before the end of the nth display period, wherein, i is a positive integer, and is less than or equal to 1, and I is the type and quantity of the positive electrode material of the battery in the target battery pack;

According to the displayed state of charge of the i-th system cell in the n-th display cycle, the actual charge state of the i-th system cell in the m-th sampling cycle, and the n-th charge state of the i-th system cell The rate of change of the display state of charge of the display cycle is determined to determine the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

According to the rate of change of the display state of charge of the i-th system cell in the n+1th display cycle, the reliability compensation coefficient and the display charge state of the i-th system cell in the n-th display cycle, Determine the display state of charge of the i-th system cell in the n+1th display cycle;

Determine the displayed state of charge of the target battery pack in the n+1th cycle according to the displayed state of charge of each system cell in the target battery pack in the n+1th display cycle.

In the above method, when there is a deviation between the display SOC at the nth moment and the actual SOC at the nth moment, the display SOC of each system cell at the n+1 display cycle can be determined according to the charge and discharge state at the nth moment rate of change. Furthermore, according to the displayed SOC of the nth display and the determined change rate, the displayed SOC of each system cell at the (n+1) time is calculated. In this way, the correction of the display SOC of each system is realized. Further, according to the displayed state of charge of each system cell at the n+1 display cycle, the displayed SOC viewed by the user at the n+1 time is more accurate.

In a possible implementation manner, according to the displayed state of charge of the i-th system cell in the nth display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle and the The rate of change of the display state of charge of the nth display cycle of the i-th system cell is determined, and the rate of change of the display charge state of the i-th system cell in the n+1 display cycle includes:

According to the charge and discharge state of the target battery pack at the current moment k, the display state of charge of the i-th system cell in the n-th display cycle, and the actual charge-discharge state of the i-th system cell in the m-th sampling cycle The state of charge and the rate of change of the display state of charge of the nth display cycle of the i-th system cell, determine the change rate of the display charge state of the i-th system cell in the n+1 display cycle .

In a possible implementation manner, when the target battery pack is in the charging or recharging state at the current moment k, the i-th battery cell is determined in the n+1th display cycle by the following formula The rate of change of the displayed state of charge:

ChangeRate(n+1) _i = KC _i *ChangeRate(n) _i *[1-(DSOC(n) _i- ASOC(m) _i )/(FSOC-DSOC(n) _i )];

Wherein, ChangeRate(n+1) _i is the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

ChangeRate(n) _i is the rate of change of the display state of charge of the i-th system cell in the nth display cycle;

DSOC(n) _i is the display state of charge of the i-th system cell in the nth display cycle;

ASOC(m) _i is the actual state of charge of the i-th system cell in the m sampling period;

FSOC is the corresponding display state of charge when the target battery pack is fully charged, and the FSOC is greater than DSOC(n) _i ;

KC _i is the first adaptive adjustment parameter of the i-th system cell, where KC _i ∈ (0, 1).

In a possible implementation manner, when the target battery pack is in a discharge state at the current moment k, the display charge of the i-th battery cell in the n+1th display cycle is determined by the following formula: Rate of change of electrical state:

ChangeRate(n+1) _i = KD _i *ChangeRate(n) _i *[1+(DSOC(n) _i -ASOC(m) _i )/DSOC(n) _i ];

Among them, ChangeRate(n+1) _i is the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle; ChangeRate(n) _i is the change rate of the i-th system cell in the nth display cycle; The rate of change of the display state of charge of the display cycle; DSOC(n) _i is the display state of charge of the i-th system cell in the nth display cycle, and is not 0; ASOC(m) ₁ is the The actual state of charge of the i-th system cell in the m-th sampling period; KD _i is the second adaptive adjustment parameter of the i-th system cell, where KD _i ∈ (0, 1).

In a possible implementation manner, the display state of charge of the i-th system cell in the n+1th display cycle is determined by the following formula: DSOC(n+1) _i =DSOC(n) _i +[( (∑ _j KR _i *DSOC(n) _j /KR _j *DSOC(n) _i )-1)/(I-1)]*SteiSOC(n+1) _i *Cd*ChangeRate(n+1) _i ;

Wherein, I represents the type quantity of the positive electrode material of the battery in the target battery pack; DSOC(n+1) _i is the display state of charge of the i-th system cell in the n+1 display cycle; DSOC(n ) _i is the display state of charge of the i-th system cell in the nth display cycle; StepSOC(n+1) _i is the actual charge of the i-th system cell in the n+1 display cycle The amount of state change; KR _i is the reliability compensation coefficient corresponding to the actual state of charge of the i-th system cell in the n+1th display cycle; KR _j is the j-th system cell in the n+1th display cycle The reliability compensation coefficient corresponding to the actual state of charge; Cd is a value that characterizes the direction of the current. When the battery pack is in the charging state, the Cd is +1. When the battery pack is in the discharging state, the Cd is -1.

In a possible implementation manner, the amount of change in the actual state of charge of the i-th system cell in the n+1th display cycle is determined by the following method: StepSOC(n+1) _i =Td*I _i ( k)/Ncap;

Wherein, Td is the duration of one display cycle; I _i (k) is the current value of the i-th system cell at the current moment; Ncap is the nominal capacity of the battery pack.

In a possible implementation manner, according to the display state of charge of each system cell in the target battery pack in the n+1th display cycle, determine the state of charge of the target battery pack in the n+1th cycle. Displays the state of charge, including:

According to the display state of charge of each system cell in the target battery pack in the n+1th display cycle, determine the maximum display state of charge in the target battery pack and the minimum display 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 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, 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.

In the above embodiments, when the maximum displayed state of charge or the minimum displayed state of charge satisfies certain conditions, the maximum displayed state of charge or the minimum displayed state of charge can better characterize the state of charge of the entire battery pack. Therefore, Directly using the maximum displayed state of charge or the minimum displayed state of charge as the state of charge of the overall target battery pack can reduce the amount of calculation while maintaining the accuracy of the displayed state of charge of the target battery pack.

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

In the above implementation manner, the influence of each system battery cell on the state of charge of the overall battery pack can be better considered, so that the determined and displayed state of charge can be more accurate.

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

An acquisition module, configured to acquire the actual state of charge of the i-th system cell in the target battery pack in the m-th sampling period corresponding to the current moment k and the i-th system battery cell in the n-th display period corresponding to the current moment k. The display state of charge of the cell, the current moment k is the moment before the end of the nth display cycle, wherein, i is a positive integer, and is less than or equal to 1, and I is the number of cells in the target battery pack;

The first determination module is configured to use the displayed state of charge of the i-th system cell in the nth display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle, and the i-th The rate of change of the displayed state of charge of the nth display cycle of the system cell is determined to determine the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

The second determination module is used for changing the rate of display state of charge of the i-th system cell in the n+1th display cycle, the reliability compensation coefficient and the i-th system battery in the n-th display cycle The display state of charge of the cell, determine the display state of charge of the i-th system cell in the n+1th display cycle;

The third determination module is used to determine the displayed charge state of the target battery pack in the n+1th cycle according to the displayed charge state of each system cell in the target battery pack in the n+1th display cycle state.

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 flowchart of a method for determining and displaying a state of charge provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of two cycles for determining and displaying the state of charge provided by the embodiment of the present application;

FIG. 3 is a partial flowchart of a method for determining and displaying a state of charge provided by an embodiment of the present application;

Figure 4 is another part of the flow chart of the method for determining and displaying the state of charge provided by the embodiment of the present application

FIG. 5 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. 6 is a circuit connection block diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

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 of the electronic device.

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

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.

At present, the method of correcting and displaying SOC is as follows: 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 open-circuit voltage of the battery. Determine whether the display SOC needs to be calibrated according to the open circuit voltage value; if so, determine the target calibration coefficient of the battery under the open circuit voltage value and the display SOC according to the preset calibration table; calibrate the display SOC according to the target calibration coefficient. 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 SOC is not accurate enough, resulting in inaccurate displayed SOC after calibration, and a display will appear Uneven SOC calculation speed and jumps 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 following describes the solutions used by the present application to solve the defects of the solutions in the prior art through some embodiments.

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 and displaying the state of charge provided by 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: Obtain the actual state of charge of the i-th battery cell in the target battery pack in the m-th sampling period corresponding to the current time k and the display of the i-th system battery cell in the n-th display cycle corresponding to the current time k state of charge.

The current moment k is the moment before the end of the nth display period, where i is a positive integer less than or equal to 1, and I is the type and quantity of the battery positive electrode material in the target battery pack.

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.

The current time k is the time before the end of the nth display period. Exemplarily, the current moment k may be any moment within the nth display period and after a specified ratio of the nth display period. For example, the current time k may be any time after four-fifths of the cycle in the nth display cycle. For example, the current time k may also be at the nine-tenths cycle time of the nth display cycle. For another example, the current time k may also be at the time of fourteen-fifteenths of the nth display period.

The current moment may be 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 in each collection time period within a fixed time period, such as charging and discharging status, actual charging status, display charging status, etc. Optionally, but the time length of each parameter acquisition cycle and the time length of the display cycle can be the same or different (in the example shown in Figure 2, the display cycle of the display state of charge is different from the sampling cycle of the actual state of charge ).

As a possible implementation manner, the battery management system acquires and records the actual state of charge in each sampling period in a sampling period; acquires and records the displayed state of charge in each display period in a 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.

As shown in FIG. 2 , the illustration shows two cycle schematic diagrams of the battery pack, which are the display cycle and the sampling cycle respectively. Among them, a plurality of display periods are shown on the display period: Td1, Td2, Td3, ..., Td(n), Td(n+1), ..., and the display charge state corresponding to each display period, such as, The displayed state of charge corresponding to one display period Td1 is DSOC(1), and the displayed state of charge corresponding to the nth display period Td(n) is DSOC(n). The sampling period shows multiple sampling periods: Ts1, Ts2, Ts3, ..., Ts(m), ..., and the actual state of charge corresponding to each sampling period, for example, the actual charge state corresponding to the first sampling period Ts1 The state of charge is ASOC(1), and the actual state of charge corresponding to the mth display period Td(m) is ASOC(m).

In the example shown in FIG. 2 , the current moment k is a critical moment between the nth display period T(n) and the nth display period T(n+1), and the current moment k is within the mth sampling period.

In order to facilitate the recording of different times and the sampling period and display period corresponding to the time, the time is recorded as: the 0th moment, the 1st moment, the 2nd moment, the 3rd moment..., the k-1th moment, the kth moment, the th At k+1 moment.....; record the sampling period as: the 1st sampling period, the 2nd sampling period, the 3rd sampling period, ..., the m-1th sampling period, the mth sampling period, the th m+1 sampling period.....; record the display period as: 1st display period, 2nd display period, 3rd display period, ..., n-1th display period, nth display period , the n+1th display cycle..... Wherein, k, n, and m are all integers greater than or equal to 1.

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

As a possible implementation, the electronic device can obtain the actual state of charge in the following way: collect parameters such as the current temperature, current, working condition, and available power range of the cells in the battery pack, and in each sampling cycle, According to the parameters such as temperature, current, working condition, and available power range of the battery cells in the battery pack during the sampling period, and according to the method of calculating the actual state of charge such as the ampere-hour integral method, the actual state of charge in each sampling period is calculated. state of charge.

As a possible implementation manner, as shown in FIG. 2 , the battery management system can determine the m-th sampling period and the n-th display period corresponding to the current time k according to the current time k. Based on the time of the current time k, the actual state of charge of the mth sampling period and the displayed state of charge of the nth display period corresponding to the current time k can be determined.

As a possible implementation manner, the current time k is a time before the end of the nth display period, then the next time k+1 of the current time k may be the time when the n+1th display period starts.

Step 120, according to the displayed state of charge of the i-th system cell in the n-th display cycle, the actual charge state of the i-th system cell in the m-th sampling cycle, and the n-th charge state of the i-th system cell The rate of change of the displayed state of charge of the display cycle is to determine the rate of change of the displayed state of charge of the i-th system cell in the n+1 display cycle.

Wherein, the value of i may be greater than or equal to one and less than or equal to one.

Optionally, according to the charging and discharging state of the target battery pack at the current moment k, the display state of charge of the i-th system cell in the n-th display cycle, and the display charge state of the i-th system cell in the m-th sampling cycle The actual state of charge and the rate of change of the display state of charge of the i-th system cell in the nth display cycle determine the change rate of the display charge state of the i-th system cell in the n+1 display cycle.

Wherein, the charge and discharge state includes a charge state and a discharge state, wherein the charge state includes a direct charge state and a recharge state.

On the one hand, when it is detected that a charging device (such as a charging gun, charging treasure, etc.) When it is detected that the charging interface of the electronic device is plugged with a charging device (such as a charging gun, a power bank, etc.) and the direction of the current is the input direction, it is determined that the target battery pack is in the recharging state; on the other hand, when the current of the electronic device is detected When the direction is the output direction, it is determined that the target battery pack is in a discharging state.

Based on the above, step 120 may include the following four possible implementations:

The first solution: at the current moment k target battery pack is in the charging state and has not reached the charging end, and the nth display cycle of the i-th battery cell displays a high state of charge, according to the i-th system battery The rate of change of the display state of charge of the nth display cycle of the cell determines the change rate of the display state of charge of the n+1th display cycle of the i-th system cell, and the n+1th display charge of the i-th system cell The rate of change of the displayed state of charge of the display cycle is smaller than the rate of change of the displayed state of charge of the i-th system cell in the nth display cycle.

In this embodiment, when the k target battery pack is in the charging state at the current moment and has not reached the charging end, and the display state of charge of the nth display cycle of the i-th battery cell is relatively high, it is necessary to 1 display cycle reduces the rate of change of the display state of charge of the i-th system cell, so that the display charge state of the i-th system cell in the n+1th display cycle is closer to the actual charge of the i-th system cell state.

The second solution: at the current moment, the k target battery pack is in the charging state and has not reached the end of charging, and the display state of charge of the nth display cycle of the i-th system battery cell is low, according to the i-th system battery pack The rate of change of the display state of charge of the nth display cycle of the cell determines the change rate of the display state of charge of the n+1th display cycle of the i-th system cell, and the n+1th display charge of the i-th system cell The rate of change of the displayed state of charge of the display cycle is greater than the rate of change of the displayed state of charge of the i-th system cell in the nth display cycle.

In this embodiment, when the k battery pack is in the charging state at the current moment and has not reached the charging end, and the display state of charge of the nth display cycle of the i-th battery cell is low, it is necessary to The display cycle increases the rate of change of the display state of charge of the i-th system cell, so that the display charge state of the i-th system cell at the n+1th moment is closer to the actual charge state of the i-th system cell.

In this embodiment, in the above-mentioned first solution and the second solution, it may be determined that the target battery pack is in an end-of-charging state when any of the following conditions is detected to be met. The conditions include but are not limited to: the current value of the charging current is less than a preset current value, the voltage value of the cell terminal voltage of the battery pack is greater than a preset voltage value, or the displayed state of charge is greater than a preset SOC value. Otherwise, it is determined that the target battery pack is not in an end-of-charging state.

It should be noted that, when the end of charging is not reached, the n+1th display cycle of the i-th system cell is calculated using the change rate of the display state of charge of the n+1-th display cycle of the i-th system cell The display of the state of charge can take into account the accuracy of the display of the state of charge without jumping.

The third solution: at the current moment, the k target battery pack is in the discharge state, and the display charge state of the nth display cycle of the i-th battery cell is relatively high, according to the n-th display of the i-th system battery cell The rate of change of the display state of charge of the period is determined, and the rate of change of the display state of charge of the n+1th display cycle of the i-th system cell is determined, and the display charge of the n+1th display cycle of the i-th system cell is The rate of change of the electrical state is greater than the rate of change of the displayed charge state of the i-th system cell in the nth display cycle.

In this embodiment, when the k target battery pack is in the discharge state at the current moment, and the display state of charge of the i-th battery cell in the n-th display cycle is relatively high, it is necessary to increase the The change rate of the displayed state of charge of the i-system battery cell, so that the displayed charge state of the i-system battery cell at the n+1th moment is closer to the actual charge state of the i-system battery cell.

The fourth solution: at the current moment k target battery pack is in the discharge state, and the display state of charge of the nth display cycle is low, according to the display state of charge of the nth display cycle of the i-th battery cell Determine the rate of change of the display state of charge of the n+1th display cycle of the i-th system cell, and the change rate of the display charge state of the n+1th display cycle of the i-th system cell is less than The rate of change of the display state of charge of the nth display cycle of the i-th system cell.

In this embodiment, when the k target battery pack is in the discharge state at the current moment, and the display state of charge of the i-th battery cell in the n-th display cycle is low, it is necessary to reduce the first display cycle in the n+1th display cycle. The rate of change of the display state of charge of the i-system cell, so that the display charge state of the i-th system cell in the n+1th display cycle is closer to the actual charge state of the i-th system cell.

Step 130, according to the rate of change of the displayed state of charge of the i-th system cell in the n+1th display cycle, the reliability compensation coefficient and the displayed state of charge of the i-th system cell in the n-th display cycle , to determine the display state of charge of the i-th system cell in the n+1th display cycle.

It can be understood that the displayed state of charge of the n+1th display cycle of the i-th system cell depends at least on the size of the displayed charge state of the i-th system cell in the n-th display cycle and the i-th system cell The rate of change of the display state of charge of the n+1th display cycle. This iterative calculation method makes the display state of charge of the i-th battery cell in the next display cycle have higher accuracy.

Generally, there is a deviation between the displayed state of charge of the i-th system cell at the same moment and the actual charge state of the i-th system cell. Wherein, the deviation includes higher or lower. Understandably, if the displayed state of charge of the nth display cycle of the i-th system cell corresponding to the current moment k is greater than the actual state of charge of the i-th system cell in the m-th sampling cycle, or exceeds the charge state of the i-th system cell The first preset amplitude of the actual state of charge of the cell in the mth sampling period, then it is determined that the display state of charge of the nth display cycle of the i-th system cell is relatively high; if the current moment k corresponds to the i-th system cell The actual state of charge of the mth sampling period is greater than the displayed state of charge of the nth display period of the i-th system cell, or exceeds the second preset display state of charge of the n-th display cycle of the i-th system cell If the amplitude is set, it is determined that the display state of charge of the nth display cycle of the i-th system cell is relatively low.

As a possible implementation, step 130 can specifically be: at the current moment k battery pack is in the charging state and has not reached the charging end, according to the display state of charge of the nth display cycle of the i-th battery cell , the rate of change of the display state of charge of the n+1th display cycle of the i-th system cell, and calculate the display charge state of the i-th system cell at the n+1th moment.

Step 140, according to the displayed state of charge of each system cell in the target battery pack at the (n+1) display cycle, determine the displayed state of charge of the target battery pack in the (n+1)th cycle.

Optionally, the average value of the displayed state of charge of each system cell in the n+1th display cycle may be calculated, and the average value may be used as the displayed state of charge of the target battery pack in the n+1th cycle.

Optionally, the displayed state of charge of one or more system cells can also be used to determine the displayed state of charge of the target battery pack in the n+1th cycle.

As a possible implementation, the solution for determining the display state of charge of the i-th battery cell in the n+1 display cycle includes but is not limited to the following two:

Option 1: If the target battery pack is in the discharge state, determine the change rate of the display state of charge of the i-th system cell in the n+1 display cycle according to the following formula:

Among them, ChangeRate(n+1) _i is the change rate of the display state of charge of the i-th system cell in the n+1 display cycle; ChangeRate(n) _i is the display charge state of the i-th system cell in the nth display cycle DSOC(n) _i is the display charge state of the i-th system cell in the nth display cycle, and is not 0; ASOC(m) ₁ is the i-th system battery The actual state of charge of the cell in the mth sampling period; KD _i is the second adaptive adjustment parameter of the i-th system cell, where KD _i ∈ (0, 1).

It can be understood that when the target battery pack is in the discharge state, (DSOC(n) _i −ASOC(m) _i )//DSOC(n) _i is the deviation rate showing the state of charge. When the difference between DSOC(n) _i and ASOC(n) is greater than 0, it indicates that the state of charge is high and the rate of change of state of charge is low, while [1+(DSOC(n) _i -ASOC(m ) _i )/DSOC(n) _i ] greater than 1, then ChangeRate(n+1) _i can be made greater than ChangeRate(n) _i . When DSOC(n) _i -ASOC(m) _i is less than 0, it indicates that the state of charge is low and the rate of change of state of charge is high, and [1+(DSOC(n) _i -ASOC(m) _i )/DSOC(n) _i ] is less than 1, then ChangeRate(n+1) _i can be made smaller than ChangeRate(n) _i .

Solution 2: If the target battery pack is in the charging state and has not reached the charging end state, then according to the following formula, determine the change rate of the display charge state of the i-th system battery cell in the n+1 display cycle:

Among them, ChangeRate(n+1) _i is the change rate of the display state of charge of the i-th system cell in the n+1 display cycle; ChangeRate(n) _i is the display charge state of the i-th system cell in the nth display cycle DSOC(n) _i is the display state of charge of the i-th system cell in the nth display cycle; ASOC(m) _i is the display charge state of the i-th system cell in the mth display cycle; The actual state of charge of the sampling period; FSOC is the corresponding display state of charge when the target battery pack is set to be fully charged, and the FSOC is greater than DSOC(n) _i ; KC _i is the first battery cell of the i-th system Adaptive adjustment parameters, where, KC _i ∈ (0, 1).

Exemplarily, (DSOC(n) _i -ASOC(m) _i )/(FSOC-DSOC(n) _i ) is the deviation rate showing the state of charge when the battery pack is in the charging state and has not reached the charging end state. Since the end of charge has not been reached, FSOC is greater than DSOC(n) _i . When DSOC(n) _i -ASOC(m) _i is greater than 0, it indicates that the state of charge is high, and [1-(DSOC(n) _i -ASOC(m) _i )/(FSOC-DSOC(n) _i )] is less than 1, then ChangeRate(n+1) _i can be made smaller than ChangeRate(n) _i . When DSOC(n) _i -ASOC(m) _i is less than 0, it indicates that the state of charge is low, and [1-(DSOC(n) _i -ASOC(m) _i )/(FSOC-DSOC(n) _i )] is greater than 1, then ChangeRate(n+1) _i can be made greater than ChangeRate(n) _i .

As a possible implementation, the calculation of the display state of charge of the i-th system cell in the n+1th display cycle can be performed in the following manner:

As shown in Figure 3, the method for determining and calculating the display state of charge of the i-th system cell in the n+1 display cycle includes:

Step 210, judging whether the target battery pack is in the charging state and has not reached the charging end state.

If yes, go to step 220 .

Step 220, according to the following formula, calculate the display state of charge of the i-th system cell in the n+1 display cycle:

DSOC(n+1) _i ＝DSOC(n) _i +[((∑ _j KR _i *DSOC(n) _j /KR _j *DSOC(n) _i )-1)/(I-1)]*SteiSOC( n+1) _i *Cd*ChangeRate(n+1) _i ;

Wherein, I represents the type quantity of the positive electrode material of the battery in the target battery pack; DSOC(n+1) _i is the display state of charge of the i-th system cell in the n+1 display cycle; DSOC(n) _i is the display state of charge of the i-th system cell in the nth display cycle; StepSOC(n+1) _i is the change amount of the actual charge state of the i-th system cell in the n+1 display cycle ; KR _i is the reliability compensation coefficient corresponding to the actual state of charge of the i-th system cell in the n+1th display cycle; KR _j is the actual charge of the j-th system cell in the n+1th display cycle The reliability compensation coefficient corresponding to the state; Cd is a value representing the direction of the current. When the battery pack is in the charging state, the Cd is +1, and when the battery pack is in the discharging state, the Cd is -1.

Among them, the reliability compensation coefficient KR can be used as the estimated error value of the display state of charge of each system cell. The value of the reliability compensation coefficient KR may be a value between (0, 1). Exemplarily, if the system cell has been corrected with high precision, the reliability compensation coefficient of the system cell is small, for example, the reliability compensation coefficient of the system cell can be 0.1, 0.2, 0.15, etc. If the error of the state of charge of the system cell is greater than the set threshold, the reliability compensation coefficient of the system cell is relatively large. For example, the reliability compensation coefficient of the system cell can be 0.7, 0.8, 0.9, etc. value.

Wherein, the variation of the actual state of charge within one display cycle can be calculated by the ampere-hour integration method and the actual current flowing through the battery pack. Exemplarily, the amount of change in the actual state of charge of the above-mentioned i-th system cell in the n+1 display cycle can be determined by the following method: StepSOC(n+1) _i =Td*I _i (k)/Ncap ;

Among them, StepSOC(n+1) _i is the change of the actual state of charge of the i-th system cell in the n+1 display cycle; Td is the duration of a display cycle; where Td is the duration of a display cycle; I _i (k) is the current value of the i-th battery cell at the current time k, and the current value I _i (k) of the target battery pack is the current value of the main circuit at the current time k during the charging and discharging process of the battery pack.

Among them, Ncap is the nominal capacity of the battery pack. In this embodiment, the nominal capacity Ncap of the target battery pack is a preset value, which can be determined according to the currently calculated battery pack.

In this embodiment, the display state of charge of the i-th system cell at time n+1 in the first scheme is based on the change rate ChangeRate of the display charge state of the i-th system cell at time n+1 (n+1) _i is calculated, and the change rate ChangeRate(n+1) _i of the cell of the i system at the moment n+1 is calculated based on the actual state of charge of the cell of the i system of.

In an optional implementation manner, step 130 may use the following steps, as shown in FIG. 4 , 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 each system cell 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 average value of the maximum displayed SOC and the minimum displayed SOC may be calculated to determine the displayed SOC of the target battery pack in the n+1th cycle.

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 The minimum display state of charge of the n+1th display cycle in the battery pack; maxDispSOC is the maximum display state of charge in the target battery pack; maxDispSOC(n+1) is the n+th display state of the target battery pack Minimum display state of charge for 1 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 displayed state of charge of each system cell in the target battery pack in the n+1th display cycle and the corresponding reliability value 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, the reliability values of the cells of each system are the same, then 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 charge of the n+1 display cycle of the target battery pack State; DSOC(n+1) _i is the display state of charge of the i-th system cell in the n+1 display cycle.

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 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 state of charge of the target battery pack in the n+1th display cycle;

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 each system cell in the target battery pack in the n+1th 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, according to the second largest displayed state of charge and the second smallest displayed state of charge, the displayed state of charge of the target battery pack in the n+1th cycle is determined.

The following is a set of actual data to further introduce the difference between the displayed state of charge of the multi-system battery pack, the displayed state of charge of each system cell, and the actual state of charge of each system cell, as shown in Table 1 below:

Table 1

As shown in the above table, the value of the state of charge of the target battery pack may be equal to the displayed state of charge of one of the system cells. For example, in the first display cycle, the displayed state of charge of the second system cell and the displayed state of charge of the target battery pack are both 10.5. The value of the state of charge of the target battery pack may also be between the displayed states of charge of the cells of each system, for example, in the second display cycle, the displayed state of charge of the second system cell is 31.6 greater than that of the target battery pack The displayed state of charge 30.5 is displayed, but the displayed state of charge 30 of the first battery cell is smaller than the displayed state of charge 30.5 of the target battery pack. For another example, in the third display period, the displayed state of charge 73.8 of the second system cell is greater than the displayed state of charge 72.8 of the target battery pack, but the displayed state of charge 70 of the first system cell is smaller than that of the target battery pack. State of charge 72.8. For another example, in the fourth display period, the displayed state of charge 95.9 of the second system cell is greater than the displayed state of charge of the target battery pack 9.56, but the displayed state of charge 90 of the first system cell is smaller than that of the target battery pack State of charge 95.6.

From the above example, it can be understood that with the increase of battery state of charge, the calculated displayed state of charge may be larger than the actual state of charge. Therefore, through the fusion calculation of the displayed state of charge of each system cell, The determined value of the displayed state of charge of the target battery pack can be made closer to the actual value.

In the above-mentioned embodiments, when there is a deviation between the displayed SOC at the nth moment and the actual SOC at the nth moment, the displayed SOC of each system cell at the n+1 display period can be determined according to the charge and discharge state at the nth moment rate of change. Furthermore, according to the displayed SOC of the nth display and the determined change rate, the displayed SOC of each system cell at the (n+1) time is calculated. In this way, the correction of the display SOC of each system is realized. Further, according to the displayed state of charge of each system cell at the n+1 display cycle, the displayed SOC viewed by the user at the n+1 time is more accurate. Further, when determining the displayed state of charge of the target battery pack as a whole, the displayed state of charge of each system cell and the influence of each system cell on the overall target battery pack's charge state can also be fully considered.

Referring to FIG. 5 , 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 may include an acquisition module 410, a first determination module 420, a second determination module 430, and a third determination module 440, wherein,

The acquisition module 410 is configured to acquire the actual state of charge of the i-th system cell in the target battery pack in the m-th sampling period corresponding to the current time k and the i-th system battery cell in the n-th display period corresponding to the current time k. The display state of charge of the core, the current moment k is the moment before the end of the nth display cycle, wherein, i is a positive integer, and is less than or equal to 1, and I is the number of batteries in the target battery pack;

The first determining module 420 is configured to use the displayed state of charge of the i-th system cell in the nth display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle, and the i-th system charge The change rate of the display state of charge of the nth display cycle of the core is determined to determine the change rate of the display charge state of the i-th system cell in the n+1 display cycle;

The second determination module 430 is used for changing the display charge state of the i-th battery cell in the n+1th display cycle, the reliability compensation coefficient and the i-th system battery cell in the n-th display cycle The display state of charge of the i-th system battery cell is determined for the display charge state of the n+1th display cycle;

The third determining module 440 is configured to determine the displayed state of charge of the target battery pack in the n+1th cycle according to the displayed state of charge of each system cell in the target battery pack in the n+1th display cycle.

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

According to the charging and discharging state of the target battery pack at the current moment k, the displayed state of charge of the i-th system cell in the n-th display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle and The rate of change of the displayed state of charge of the i-th system cell in the nth display cycle determines the rate of change of the displayed charge state of the i-th system cell in the n+1 display cycle.

In a possible design scheme, when the target battery pack is in the charging or recharging state at the current moment k, the display charge of the i-th battery cell in the n+1th display cycle is determined by the following formula: Rate of change of electrical state:

In a possible design scheme, when the target battery pack is in the discharge state at the current moment k, the display charge state of the i-th battery cell in the n+1th display cycle is determined by the following formula Rate of change:

Among them, ChangeRate(n+1) _i is the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

ChangeRate(n) _i is the change rate of the display state of charge of the i-th system cell in the nth display cycle; DSOC(n) _i is the display charge state of the i-th system cell in the nth display cycle , and not 0; ASOC(m) ₁ is the actual state of charge of the i-th system cell in the m sampling period; KD _i is the second adaptive adjustment parameter of the i-th system cell, where KD _i ∈ (0, 1).

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

In a possible design scheme, the variation of the actual state of charge of the i-th system cell in the n+1 display cycle is determined by the following method:

StepSOC(n+1) _i = Td*I _i (k)/Ncap;

Among them, Td is the duration of a display cycle; I _i (k) is the current value of the i-th system cell at the current moment; Ncap is the nominal capacity of the battery pack.

In a possible design solution, the third determining module 440 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 each system cell 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 each system cell in the target battery pack in the n+1 display cycle and the corresponding reliability value of each system cell, determine the display charge of the target battery pack in the n+1 cycle power state.

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 process of the invention.

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. 6. FIG. 6 is a schematic structural diagram of an electronic device for performing a battery pack display SOC determination method 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. 6 is only for illustration, and the electronic device may also include more or less components than those shown in FIG. 6 , or have a configuration different from that shown in FIG. 6 . Each component shown in FIG. 6 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 charging and discharging state of the battery pack at the nth moment, the displayed SOC at the nth moment, and the actual SOC at the nth moment; determining the displayed SOC relative to the actual SOC at the nth moment The deviation; according to the deviation and the charge and discharge state at the nth moment, determine the change rate of the display SOC at the n+1 moment; according to the change rate of the display SOC at the n+1 moment and the display SOC at the nth moment, calculate the n+ The display SOC at time 1, where n is an integer greater than or equal to 1.

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 state of charge of the i-th system cell in the target battery pack in the m-th sampling period corresponding to the current time k and the display charge of the i-th system cell in the n-th display cycle corresponding to the current time k State, the current moment k is the moment before the end of the nth display period, wherein, i is a positive integer, and is less than or equal to 1, and I is the type and quantity of the positive electrode material of the battery in the target battery pack;

According to the displayed state of charge of the i-th system cell in the n-th display cycle, the actual charge state of the i-th system cell in the m-th sampling cycle, and the n-th charge state of the i-th system cell The rate of change of the display state of charge of the display cycle is determined to determine the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

According to the rate of change of the display state of charge of the i-th system cell in the n+1th display cycle, the reliability compensation coefficient and the display charge state of the i-th system cell in the n-th display cycle, Determine the display state of charge of the i-th system cell in the n+1th display cycle;

Determine the displayed state of charge of the target battery pack in the n+1th cycle according to the displayed state of charge of each system cell in the target battery pack in the n+1th display cycle.
The method according to claim 1, characterized in that, according to the displayed state of charge of the i-th system cell in the n-th display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle The state of charge and the rate of change of the display state of charge of the nth display cycle of the i-th system cell, determine the change rate of the display charge state of the i-th system cell in the n+1 display cycle ,include:

According to the charge and discharge state of the target battery pack at the current moment k, the display state of charge of the i-th system cell in the n-th display cycle, and the actual charge-discharge state of the i-th system cell in the m-th sampling cycle The state of charge and the rate of change of the display state of charge of the nth display cycle of the i-th system cell, determine the change rate of the display charge state of the i-th system cell in the n+1 display cycle .
The method according to claim 2, wherein when the target battery pack is in the state of charging or recharging at the current moment k, the n-th battery cell of the i-th system is determined by the following formula Rate of change of display state of charge for +1 display cycle:

ChangeRate(n+1) i = KC i *ChangeRate(n) i *[1-(DSOC(n) i- ASOC(m) i )/(FSOC-DSOC(n) i )];

Wherein, ChangeRate(n+1) i is the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

ChangeRate(n) i is the rate of change of the display state of charge of the i-th system cell in the nth display cycle;

DSOC(n) i is the display state of charge of the i-th system cell in the nth display cycle;

ASOC(m) i is the actual state of charge of the i-th system cell in the m sampling period;

FSOC is the corresponding display state of charge when the target battery pack is fully charged, and the FSOC is greater than DSOC(n) i ;

KC i is the first adaptive adjustment parameter of the i-th system cell, where KC i ∈ (0, 1).
The method according to claim 2, wherein when the target battery pack is in a discharge state at the current moment k, the n+1th cell of the i-th system is determined by the following formula The rate of change of the display state of charge of the display cycle:

ChangeRate(n+1) i = KD i *ChangeRate(n) i *[1+(DSOC(n) i -ASOC(m) i )/DSOC(n) i ];

Wherein, ChangeRate(n+1) i is the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

ChangeRate(n) i is the rate of change of the display state of charge of the i-th system cell in the nth display cycle;

DSOC(n) i is the display state of charge of the i-th system cell in the nth display cycle, and is not 0;

ASOC(m) 1 is the actual state of charge of the i-th system cell in the m sampling period;

KD i is the second adaptive adjustment parameter of the i-th system cell, where KD i ∈ (0, 1).
The method according to claim 3 or 4, wherein the display state of charge of the i-th system cell in the n+1th display cycle is determined by the following formula:

DSOC(n+1) i ＝DSOC(n) i +[((∑ j KR i *DSOC(n) j /KR j *DSOC(n) i )-1)/(I-1)]*SteiSOC( n+1) i *Cd*ChangeRate(n+1) i ;

Wherein, I represents the type and quantity of the positive electrode material of the battery in the target battery pack;

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

DSOC(n) i is the display state of charge of the i-th system cell in the nth display cycle;

StepSOC(n+1) i is the variation of the actual state of charge of the i-th system cell in the n+1 display cycle;

KR i is the reliability compensation coefficient corresponding to the actual state of charge of the i-th system cell in the n+1th display cycle;

KR j is the reliability compensation coefficient corresponding to the actual state of charge of the jth system cell in the n+1th display cycle;

Cd is a value representing the direction of the current. When the battery pack is in a charging state, the Cd is +1, and when the battery pack is in a discharging state, the Cd is -1.
The method according to claim 5, wherein the variation of the actual state of charge of the i-th system cell in the n+1th display period is determined by the following method:

StepSOC(n+1) i = Td*I i (k)/Ncap;

Wherein, Td is the duration of a display cycle;

I i (k) is the current value of the i-th system cell described in k at the current moment;

Ncap is the nominal capacity of the 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 each system cell in the target battery pack in the n+1th display cycle The display state of charge of the package in the n+1th cycle includes:

According to the display state of charge of each system cell in the target battery pack in the n+1th display cycle, determine the maximum display state of charge in the target battery pack and the minimum display 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%;

Wherein, 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 maximum displayed state of charge in the target battery pack.
The method according to claim 7, wherein 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 ,include:

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 any one of claims 1-6, wherein the target battery is determined according to the displayed state of charge of each system cell in the target battery pack in the n+1th display cycle The display state of charge of the package in the n+1th cycle includes:

According to the displayed state of charge of each system cell in the target battery pack in the n+1th display cycle and the reliability value corresponding to each system cell, determine the target battery pack in the n+1th cycle display state of charge.
A device for determining and displaying the state of charge is characterized in that it includes:

An acquisition module, configured to acquire the actual state of charge of the i-th system cell in the target battery pack in the m-th sampling period corresponding to the current moment k and the i-th system battery cell in the n-th display period corresponding to the current moment k. The display state of charge of the cell, the current moment k is the moment before the end of the nth display cycle, wherein, i is a positive integer, and is less than or equal to 1, and I is the number of cells in the target battery pack;

The first determination module is configured to use the displayed state of charge of the i-th system cell in the nth display cycle, the actual state of charge of the i-th system cell in the m-th sampling cycle, and the i-th The rate of change of the displayed state of charge of the nth display cycle of the system cell is determined to determine the rate of change of the display state of charge of the i-th system cell in the n+1 display cycle;

The second determination module is used for changing the rate of display state of charge of the i-th system cell in the n+1th display cycle, the reliability compensation coefficient and the i-th system battery in the n-th display cycle The display state of charge of the cell, determine the display state of charge of the i-th system cell in the n+1th display cycle;

The third determination module is used to determine the displayed charge state of the target battery pack in the n+1th cycle according to the displayed charge state of each system cell in the target battery pack in the n+1th 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 10.
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 1-10. 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 1-10 when executed by a processor.