A method, system, and vehicle for correcting the state of charge (SOC) of a car battery.

Abstract

This invention discloses a method, system, and vehicle for correcting the displayed State of Charge (SOC) of an automotive battery. The method includes obtaining the current driving condition thermal management request level, the current minimum battery system temperature T, and the displayed SOC. Disi Where i∈N, and initially i=0; set the sliding weighting coefficient η according to the current driving condition thermal management request level; obtain the zero-point values ​​with and without temperature rise based on the current minimum battery system temperature T, and calculate the SOC according to the sliding weighting coefficient η. 计算 Value; based on the initial displayed SOC Dis0 Calculate the stepless correction coefficient λ i During operation, when the vehicle is in a state of regenerative current, the SOC (State of Charge) is... Disi The value remains unchanged; when in discharge current, according to the stepless correction coefficient λ i Calculate the current display SOC Disi+1 When the time interval is Δt, calculate the correction boundary coefficient θ, and adjust the current displayed SOC based on the magnitude of the correction boundary coefficient θ. Disi+1 ; For the display SOC Disi Perform iterative calculations until the end of a single trip.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vehicles, and particularly relates to a correction method and system for SOC of a vehicle battery and a vehicle. BACKGROUND

[0002] The capacity of a lithium battery changes with temperature due to its unique electrochemical characteristics, and the lower the temperature, the smaller the value. Considering this factor, the current instantaneous SOC calculation method is mainly the ampere-hour integration method with a temperature factor, and the formula is SOC = SOC0 - ∫i*dt / C0, wherein C0 = f(T), and the value changes between 0 and 100%. However, because the capacity decreases at low temperatures, many customers complain that the electric vehicle has a sudden increase in power consumption, a rapid decay rate of the remaining power and the remaining range, and the like when driving in a low-temperature environment, which easily causes the customers to misjudge the remaining range and thus causes range anxiety. These situations have become a problem of concentrated complaints from customers.

[0003] The invention patent application with the publication number CN116331062A and the name of a battery SOC dynamic correction method, system and vehicle having the same adopts a table SOC grading correction strategy, adjusts the correction rate threshold value in different SOC stages to quickly catch up with the real SOC value, the strategy is relatively simple, and the problem of too fast SOC correction at low temperatures cannot be solved.

[0004] The invention patent with the authorized publication number CN107571747B and the name of a SOC smoothing control method, device, battery management system and vehicle is a method for setting a compensation coefficient according to the difference between the current table SOC and the real SOC and the discharge current value, and the calculation formula is SOC dis = SOC real- λ n *SOC delta The principle is also to adopt a table SOC grading correction strategy, and the problem of too fast SOC correction at low temperatures cannot be solved.

[0005] In summary, the method for displaying SOC of a vehicle battery in the prior art has the problem of too fast SOC correction at low temperatures, which easily causes a jump, a sudden increase in displayed power consumption, a misjudgment of the decay rate of the remaining range by the user, and the like, and causes the problem of range anxiety. SUMMARY

[0006] The purpose of this invention is to provide a method, system, and vehicle for correcting the State of Charge (SOC) display of a car battery. This addresses the problem in existing methods for displaying SOC in automobiles, where rapid changes in SOC at low temperatures can easily cause sudden spikes, leading to a sudden increase in displayed energy consumption and causing users to misjudge the rate of remaining driving range degradation, thus triggering range anxiety. This invention effectively improves the user's experience with range and energy consumption data at low temperatures, alleviates range anxiety, and ensures that SOC spikes and vehicle breakdowns do not occur during driving.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for correcting the state of charge (SOC) of an automotive battery, comprising:

[0009] Obtain the current driving condition thermal management request level, the current minimum battery system temperature T, and the displayed SOC. Disi Where i ∈ N, and initially i = 0;

[0010] Set the sliding weighting coefficient η according to the current driving condition thermal management request level;

[0011] Based on the current minimum temperature T of the battery system, obtain the zero-point values ​​with and without temperature rise, and calculate the SOC based on the sliding weighting coefficient η. 计算 value;

[0012] Based on the initial displayed SOC Dis0 Calculate the stepless correction coefficient λ i ;

[0013] During operation, when the vehicle is in a state of feedback current, the SOC (State of Charge) is... Disi The value remains unchanged; when in discharge current, according to the stepless correction coefficient λ i Calculate the current display SOC Disi+1 ;

[0014] When the time interval is Δt, calculate the correction boundary coefficient θ, and adjust the current displayed SOC based on the magnitude of the correction boundary coefficient θ. Disi+1 ;

[0015] For display SOC Disi Perform iterative calculations until the end of a single trip.

[0016] Preferably, a sliding weighted coefficient η is set based on the current driving condition thermal management request level, specifically including:

[0017] When there is no thermal management request, the sliding weighting coefficient η is 0;

[0018] When the heating level of the thermal management is LV1, the sliding weighting coefficient η is taken as 0.2;

[0019] When the heating level of the thermal management is LV2, the sliding weighting coefficient η is taken as 0.5;

[0020] When the heating level of the thermal management is LV3, the sliding weighting coefficient η is taken as 0.8.

[0021] Preferably, the step of obtaining zero-point values ​​with and without temperature rise based on the current minimum battery system temperature T specifically includes: obtaining zero-point values ​​with and without temperature rise based on the current minimum battery system temperature T using the SOC zero-point lookup table method; interpolating the SOC zero-point values ​​with the current minimum battery system temperature T using linear interpolation; and interpolating the values ​​using nearest neighbor interpolation.

[0022] Preferably, the stepless correction coefficient λ i The calculation formula is:

[0023] λ i =(SOC) Disi -SOC 计算i ) / SOC Disi +1;

[0024] Among them, SOC 计算i The battery's usable SOC at the corresponding temperature;

[0025] SOC Disi This is the displayed SOC value at the previous moment.

[0026] Preferably, the SOC is calculated using a sliding weighted formula based on the sliding weighted coefficient η. 计算 The value, the sliding weighted formula is:

[0027] SOC 计算 =SOC 真实 -(η*SOC 零点1 +(1-η)*SOC 零点2 );

[0028] Among them: SOC 真实 This represents the battery's true state of charge (SOC) at room temperature.

[0029] SOC 零点1 This is the calibration value for the no-temperature-rise test method;

[0030] SOC 零点2 The calibration value is obtained using the temperature rise test method;

[0031] η is a sliding weighting coefficient, 0≤η≤1, and the value of η is related to the current thermal management request level.

[0032] Preferably, the formula for calculating the corrected boundary coefficient θ is:

[0033] θ=(SOC Disi -SOCDisi+1 ) / Δt, and |θ|≤|θmax|;

[0034] Among them: SOC Disi+1 The displayed SOC value at the current moment;

[0035] SOC Disi The displayed SOC value at the previous moment;

[0036] Δt is the time interval;

[0037] θmax is the maximum correction rate.

[0038] Preferably, the displayed SOC value at the current time is calculated based on the magnitude of the corrected boundary coefficient θ, specifically including:

[0039] Define the maximum correction coefficient as θmax. When |θ|≥|θmax|, then θ=θmax, and the SOC is updated. Disi+1 =SOC Disi +θmax*Δt, otherwise, update SOC according to the stepless algorithm. Disi .

[0040] Preferably, the formula for calculating the displayed SOC value is:

[0041] SOC Disi+1 =SOC Disi +∫λ i *i*dt / C0;

[0042] Among them, SOC Disi+1 Display SOC at the current moment;

[0043] SOC Disi The previous state of charge (SOC) was displayed.

[0044] C0 represents the capacity at room temperature;

[0045] λ i It is a stepless correction coefficient;

[0046] i represents the corresponding time.

[0047] A correction system for displaying the State of Charge (SOC) of a car battery includes a data acquisition module and a SOC module. 计算 Value module, stepless correction coefficient module, and corrected boundary coefficient module;

[0048] The data acquisition module is used to acquire the current driving condition thermal management request level, the current minimum battery system temperature T, and the displayed SOC. Disi Where i ∈ N, and initially i = 0;

[0049] The SOC 计算The value module is used to calculate the State of Charge (SOC) by using the current driving condition thermal management request level and the current minimum battery system temperature (T) from the data acquisition module. 计算 value;

[0050] The stepless correction coefficient module is used to obtain the initial displayed SOC from the data acquisition module. Dis0 Calculate the stepless correction coefficient λ i ;

[0051] The modified boundary coefficient module is used to calculate the modified boundary coefficient θ, and based on the magnitude of the modified boundary coefficient θ, to correct the current displayed SOC. Disi+1 ;

[0052] The SOC value display module is used to determine the stepless correction coefficient λ in the stepless correction coefficient module. i Calculate the current display SOC Disi+1 ; and by correcting the boundary coefficient θ in the boundary coefficient correction module, the current displayed SOC is calculated. Disi+1 .

[0053] A car is equipped with a battery SOC correction system as described above;

[0054] Alternatively, the vehicle battery display SOC can be corrected using any of the above-described methods.

[0055] Compared with the prior art, the present invention has the following beneficial technical effects:

[0056] This invention provides a method for correcting the State of Charge (SOC) displayed on a car battery. Through a stepless SOC correction strategy, the required correction value (ΔSOC) is distributed across the remaining correctable range for adjustment, addressing the issue of rapid SOC and remaining driving range degradation at low temperatures. Simultaneously, a sliding weighted algorithm is introduced based on current thermal management strategies to perform temperature-based correction on the ΔSOC value, predicting SOC change trends in a timely manner and providing an accurate remaining SOC. Finally, to prevent rapid SOC changes from causing jumps, a boundary setting is implemented for the SOC correction rate. This invention effectively improves the user's experience with range and energy consumption at low temperatures, alleviates range anxiety, and ensures that SOC jumps and vehicle breakdowns do not occur during driving. Attached Figure Description

[0057] Figure 1 This is a flowchart illustrating a method for correcting the state of charge (SOC) of an automotive battery according to the present invention.

[0058] Figure 2 This is a diagram illustrating the stepless correction coefficient λ in Embodiment 3 of the present invention;

[0059] Figure 3This is a diagram illustrating the SOC correction in Embodiment 3 of the present invention. Detailed Implementation

[0060] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0066] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0067] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0068] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0069] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0070] This invention introduces a stepless change calculation method into the SOC display correction strategy, enabling the SOC display to change relatively linearly and smoothly across the entire domain; it also introduces a sliding weighted algorithm to predict the SOC change trend based on the user's current thermal management strategy; finally, the SOC correction strategy is subject to boundary constraints to prevent the SOC display from changing too rapidly.

[0071] Example 1

[0072] This invention provides a method for correcting the displayed state of charge (SOC) of an automotive battery, specifically including the following steps:

[0073] Step 1: Read the current driving condition thermal management request level, and set the sliding weighting coefficient η according to the thermal management request level;

[0074] Step 2: Read the current minimum temperature T of the battery system, and obtain the zero-point values ​​with and without temperature rise using the SOC zero-point lookup table method. Calculate the SOC using the sliding weighted formula. 计算 value;

[0075] Step 3, Read the initial display SOC Dis0 λ is obtained from the formula for the correction of the infinite coefficient. i ;

[0076] Step 4: During operation, define the feedback current as positive and the discharge current as negative. If feedback occurs, the State of Charge (SOC) will be... Disi+1 If the discharge occurs, the current displayed SOC will be calculated using a stepless algorithm. Disi+1 ;

[0077] Step 5: Calculate the corrected boundary coefficient θ after time Δt. If |θ|≥|θmax|, then θ=θmax, and update the SOC. Disi+1 =SOC Disi +θmax*Δt, otherwise update the current SOC according to the stepless algorithm. Disi+1 .

[0078] Step 6: Iteratively calculate the SOC display until the end of a single trip.

[0079] The basic calculation formula for SOC display in this embodiment of the invention is as follows:

[0080] SOC Disi+1 =SOC Disi +∫λ i *i*dt / C0;

[0081] Among them: SOC Disi+1 Display SOC at the current moment;

[0082] SOC Disi The previous state of charge (SOC) was displayed.

[0083] C0 represents the capacity at room temperature;

[0084] λ i Let λ be the stepless correction coefficient, and define λ as... i =(SOC) Disi -SOC 计算i ) / SOC Disi+1;

[0085] SOC 计算i The battery's usable SOC at the corresponding temperature;

[0086] The sliding weighted calculation formula in this embodiment of the invention is as follows:

[0087] SOC 计算 =SOC 真实 -(η*SOC 零点1 +(1-η)*SOC 零点2 );

[0088] Among them: SOC 真实 This represents the battery's true state of charge (SOC) at room temperature.

[0089] SOC 零点1 This is the calibration value for the no-temperature-rise test method;

[0090] SOC 零点2 The calibration value is obtained using the temperature rise test method;

[0091] η is a sliding weighting coefficient, 0 ≤ η ≤ 1, and its value is related to the current thermal management request level;

[0092] The boundary coefficient is modified to θ, and is defined as θ = (SOC) over a time interval of Δt. Disi -SOC Disi+1 ) / Δt, and |θ|≤|θmax|;

[0093] Among them: SOC Disi+1 The displayed SOC value at the current moment;

[0094] SOC Disi The displayed SOC value at the previous moment;

[0095] Δt is the time interval;

[0096] θmax is the maximum correction rate.

[0097] This invention provides a system for correcting the State of Charge (SOC) of an automotive battery display, including a data acquisition module and a SOC module. 计算 Value module, stepless correction coefficient module, and corrected boundary coefficient module;

[0098] The data acquisition module is used to acquire the current driving condition thermal management request level, the current minimum battery system temperature T, and the displayed SOC. Disi Where i ∈ N, and initially i = 0;

[0099] The SOC 计算 The value module is used to calculate the State of Charge (SOC) by using the current driving condition thermal management request level and the current minimum battery system temperature (T) from the data acquisition module.计算 value;

[0100] The stepless correction coefficient module is used to obtain the initial displayed SOC from the data acquisition module. Dis0 Calculate the stepless correction coefficient λ i ;

[0101] The modified boundary coefficient module is used to calculate the modified boundary coefficient θ, and based on the magnitude of the modified boundary coefficient θ, to correct the current displayed SOC. Disi+1 ;

[0102] The SOC value display module is used to determine the stepless correction coefficient λ in the stepless correction coefficient module. i Calculate the current display SOC Disi+1 ; and by correcting the boundary coefficient θ in the boundary coefficient correction module, the current displayed SOC is calculated. Disi+1 .

[0103] This invention provides a car equipped with the aforementioned car battery SOC correction system. This system distributes the required correction ΔSOC value across the remaining correctable domain for correction, performs temperature correction on the ΔSOC value, predicts SOC change trends in a timely manner, and provides the correct remaining SOC.

[0104] Example 2

[0105] like Figure 1 As shown, the method for continuously and dynamically correcting the displayed SOC of an automotive battery according to the present invention specifically includes the following steps:

[0106] Step 1: When the vehicle starts, read the displayed SOC value stored when the vehicle was last parked, set it as the initial displayed SOC, and record it as SOC. Dis0 ;

[0107] Step 2: Read the minimum battery system temperature T when the vehicle starts. min Find the SOC zero-point data with temperature rise respectively. 1 零点 and zero-point SOC data without temperature rise 2 零点 The table lookup method is used. The SOC zero point value and temperature T are interpolated by linear interpolation, while the nearest neighbor interpolation method is used for extrapolation.

[0108] Step 3: Read the thermal management heating request level (LV) when the vehicle starts, and set an appropriate value for the sliding weighting coefficient;

[0109] η is 0 when there is no thermal management request;

[0110] When the heating level of the thermal management is LV1, η is taken as 0.2;

[0111] When the heating level of the thermal management is LV2, η is taken as 0.5;

[0112] When the heating level of the thermal management is LV3, η is taken as 0.8;

[0113] According to SOC 计算 Logically, knowing the SOC at time i 计算i =SOC 真实 -(η i *SOC 1 零点 +(1-η i )*SOC 2 零点 ), where i∈N;

[0114] Step 4: According to the formula for the stepless correction coefficient, the stepless correction coefficient is: λ i =(SOC) Disi -SOC 计算i ) / SOC Disi +1, where i∈N;

[0115] Step 5: During operation, define the feedback current sign as positive and the discharge current sign as negative. If feedback is present, then the State of Charge (SOC) is... Disi If the discharge occurs, the current displayed SOC will be calculated using a stepless algorithm. Disi According to the basic formula for calculating SOC, the SOC is... Dis1 =SOC Dis0 +λ0*∫i*dt / C0;

[0116] Step Six: Update the SOC display value when the time interval is Δt. Disi+1 =SOC Disi +λ i *∫i*dt / C0, denoted as SOC Disi+1 where i∈N; N is the current time;

[0117] Step 7: Define the maximum correction factor as θmax, preferably θmax = 0.2, more preferably Δt = 60 (seconds), and calculate the boundary correction factor θ = (SOC) Disi -SOC Disi+1 ) / Δt, when |θ|≥|θmax|, then θ=θmax, and update SOC. Disi+1 =SOC Disi -θmax*Δt, otherwise update the current display SOC according to the stepless algorithm;

[0118] Repeat steps two through seven until a single trip is completed.

[0119] This invention provides a vehicle that uses the aforementioned method for correcting the displayed State of Charge (SOC) of a vehicle battery. This method distributes the required correction ΔSOC value across the remaining correctable domain for correction, applies temperature correction to the ΔSOC value, predicts SOC change trends in a timely manner, and provides an accurate remaining SOC.

[0120] Example 3

[0121] This invention provides a method for continuously and dynamically correcting the displayed state of charge (SOC) of an automotive battery, specifically including the following processes:

[0122] The system pre-stores zero-point tables for both SOC with and without temperature rise, and their calibration methods are as follows:

[0123] There is a zero-point temperature rise calibration method: At a normal temperature of 25±2℃, the battery is charged at a constant current rate of 1 / 3C to the cutoff voltage, and then charged at a constant voltage rate of the cutoff voltage to a current of 0.05C. After standing for one hour, it is discharged at 1 / 3C at room temperature to the cutoff voltage. The resulting capacity is the nominal capacity, denoted as C0.

[0124] Charge the battery at room temperature using the same method, then let it rest at a specified temperature T until the temperature matches the ambient temperature. Finally, discharge the battery at 1 / 3C rate to the cutoff voltage to obtain the discharge capacity C at the corresponding temperature. 1 T , to obtain SOC 1 零点T =C 1 T / C0; Test the capacity values ​​at different temperatures sequentially.

[0125] Let the temperature matrix T = [-30 -20 -10 0 10 25 35 45 55], and the final result is as follows: Figure 2 The SOC shown 1 零点 -T matrix table. SOC 1 零点 Linear interpolation is used for interpolation with temperature T, while nearest neighbor interpolation is used for extrapolation.

[0126] Temperature / °C -30 -20 -10 0 10 25 35 45 55 SOC 1 零点 ]]> SOC 1 -30 ]]> SOC 1 -20 ]]> SOC 1 -10 ]]> SOC 1 0]]> SOC 1 10 ]]> SOC 1 25 ]]> SOC 1 35 ]]> SOC 1 45 ]]> SOC 1 55 ]]>

[0127] Zero-point calibration method without temperature rise: At room temperature (25±2℃), charge the battery at a constant current rate of 1 / 3C to the cutoff voltage, then charge it at a constant voltage rate of the cutoff voltage until the current reaches 0.05C. After resting for one hour, discharge it at 1 / 3C for 10% of its capacity at room temperature. The cutoff voltage is the same as the voltage corresponding to a continuous 1 / 3C discharge of 10%. The resulting capacity is recorded as C. RT1 After standing for one hour, it is discharged again at 1 / 3C to obtain 10% of its capacity. This capacity is recorded as C. RT2This process continues until the discharge reaches the cutoff voltage, at which point the total capacity at room temperature is... i∈N+;

[0128] Charge the battery at room temperature using the same method, then let it rest at a specified temperature T until the temperature matches the ambient temperature. Next, discharge it at a 1 / 3C discharge rate for 10% of its capacity. The cutoff voltage is the same as the voltage corresponding to a 1 / 3C continuous discharge for 10%. Record the resulting capacity as C. 2 T1 After being left to stand at ambient temperature, it is discharged again at 1 / 3C to obtain 10% of its capacity. This capacity is recorded as C. 2 T2 This process continues until the discharge reaches the cutoff voltage, at which point the total capacity is... SOC 2 零点T =C 2 T / C 0* The capacity values ​​were tested sequentially at different temperatures.

[0129] Let the temperature matrix T = [-30 -20 -10 0 10 25 35 45 55], and the final result is as follows: Figure 3 The SOC shown 2 零点 -T matrix table. SOC 2 零点 Linear interpolation is used for interpolation with temperature T, while nearest neighbor interpolation is used for extrapolation.

[0130] Temperature / °C -30 -20 -10 0 10 25 35 45 55 SOC 2 零点 ]]> SOC 2 -30 ]]> SOC 2 -20 ]]> SOC 2 -10 ]]> SOC 2 0]]> SOC 2 10 ]]> SOC 2 25 ]]> SOC 2 35 ]]> SOC 2 45 ]]> SOC 2 55 ]]>

[0131] The thermal management heating level is divided into three levels: LV1, LV2, and LV3, with the corresponding heating capacity gradually increasing.

[0132] In this embodiment of the invention, the thermal management heating request level LV and the sliding weighted coefficient have the following relationship:

[0133] 1. When there is no heating request, η = 0;

[0134] 2. When the heating level is LV1, the heating rate is relatively slow, and η∈[0,0.3];

[0135] 3. When the heating level is LV2, the heating rate is moderate, and η∈(0.3,0.7];

[0136] 4. When the heating level is LV3, the heating rate is faster, and η∈(0.7,1];

[0137] This invention employs a stepless SOC (State of Charge) adjustment strategy, distributing the required ΔSOC value across the entire range for correction. This addresses the issue of rapid SOC and remaining range degradation in low temperatures. Simultaneously, a sliding weighted algorithm is introduced based on current thermal management strategies to adjust the ΔSOC value according to temperature, predicting SOC trends and providing accurate remaining SOC readings. Finally, to prevent rapid SOC fluctuations, a boundary setting is implemented for the SOC correction rate. This invention effectively improves the user experience regarding range and energy consumption in low temperatures, alleviates range anxiety, and ensures that SOC fluctuations and vehicle breakdowns do not occur during driving.

[0138] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0139] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A correction method of a display SOC of an automobile battery, characterized by, Comprising, obtaining a current driving condition thermal management request level, a current minimum temperature T of the battery system, and a state of charge (SOC) Disi where i ∈ N, and i = 0 initially. According to the current driving condition heat management request level setting sliding weighting coefficient η; According to the minimum temperature T of the current battery system, the zero point values with and without temperature rise are obtained, and the SOC is calculated according to the sliding weighting coefficient η 计算 values; According to the initial table SOC Dis0 Calculating the stepless correction coefficient λ i ; During driving, SOC Disi remains constant at the value of the feedback current; Discharge current time, according to stepless correction coefficient λ i Calculate the current apparent SOC Disi+1 ; When the time interval is Δt, a correction boundary coefficient θ is calculated, and according to the size of the correction boundary coefficient θ, the current indicated SOC is corrected Disi+1 ; The SOC is shown on the meter Disi The iterative calculation is performed until the end of the single trip.

2. The method of claim 1, wherein the SOC of the battery is corrected based on the temperature of the battery. According to the current driving condition heat management request level setting sliding weighting coefficient η, specifically comprising, When there is no heat management request, the sliding weighting coefficient η is 0; When the heat management heating level is LV1, the sliding weighting coefficient η is 0.2; When the heat management heating level is LV2, the sliding weighting coefficient η is 0.5; When the heat management heating level is LV3, the sliding weighting coefficient η is 0.

8.

3. The method for correcting the state of charge (SOC) of an automotive battery according to claim 1, characterized in that, The step of obtaining the zero point value without temperature rise and with temperature rise according to the current battery system minimum temperature T, specifically comprising: According to the current battery system minimum temperature T, the zero point value without temperature rise and with temperature rise is obtained by SOC zero point lookup table method, and the linear interpolation method is used for interpolation between the SOC zero point value and the current battery system minimum temperature T, and the adjacent interpolation method is used for extrapolation.

4. The method of claim 1, wherein the SOC of the battery is corrected based on the temperature of the battery. Stepless correction coefficient λ i The calculation formula is λ i = (SOC Disi - SOC 计算i ) / SOC Disi + 1; wherein SOC 计算i is the available SOC for the battery at the corresponding temperature; SOC Disi SOC value of the previous time.

5. The method of claim 1, wherein the SOC of the battery is corrected by using a battery model. SOC is calculated using the sliding weighting formula based on the sliding weighting coefficient η. 计算 The value, the sliding weighted formula is: SOC 计算 = SOC 真实 - (η * SOC 零点1 + (1 - η) * SOC 零点2 ); wherein: SOC 真实 is the true SOC of the battery at normal temperature; SOC 零点1 is the calibration value for the no temperature rise test method; SOC 零点2 is the calibrated value with the temperature rise test method; The sliding weighting coefficient η, 0≤η≤1, the value of η is related to the current heat management request level.

6. The method for correcting the state of charge (SOC) of an automotive battery according to claim 1, characterized in that, The calculation formula of the correction boundary coefficient θ is: θ = (SOC Disi -SOC Disi+1 ) / Δt, and |θ|≤|θmax|. wherein: SOC Disi+1 is the current SOC value at the current time; SOC Disi SOC value of the previous time; Δt is the time interval; θmax is the maximum correction rate.

7. The method of claim 1, wherein the SOC of the battery is corrected by using a battery model. According to the size of the correction boundary coefficient θ, the apparent SOC value at the current time is calculated, specifically comprising, The maximum correction coefficient is defined as θmax, when |θ|≥|θmax|, then θ=θmax, and the SOC is updated Disi+1 = SOC Disi + θmax*Δt, otherwise, the SOC is updated according to the stepless algorithm Disi .

8. The method of claim 1, wherein the SOC of the battery is corrected by using a battery model. The calculation formula of the apparent SOC value is: SOC Disi+1 = SOC Disi + ∫λ i * i / dt / C0; wherein SOC Disi+1 is the current time indicated SOC; SOC Disi Show SOC for last time table; C0 is the capacity corresponding to normal temperature; λ i is a step correction factor; i is the corresponding time.

9. A correction system for displaying the SOC of an automobile battery, characterized by The SOC value acquisition module comprises a data acquisition module, an SOC 计算 The SOC value acquisition module comprises a data acquisition module, an SOC The data acquisition module is configured to acquire a current driving condition thermal management request level, a current battery system minimum temperature T, and a table SOC Disi wherein i ∈ N, and i = 0 initially. The SOC 计算 The value module is configured to calculate the SOC by the current driving condition thermal management request level in the data acquisition module and the current battery system minimum temperature T 计算 value; The stepless correction coefficient module is used to show the initial SOC in the data acquisition module Dis0 Calculate stepless correction coefficient λ i ; The correction boundary coefficient module is configured to calculate a correction boundary coefficient θ, and correct the calculated current apparent SOC according to the size of the correction boundary coefficient θ. Disi+1 ; The apparent SOC value module is configured to correct the current apparent SOC according to the stepless correction coefficient λ in the stepless correction coefficient module i calculating the current apparent SOC Disi+1 ; and correcting the current apparent SOC by correcting the correction boundary coefficient θ in the correction boundary coefficient module Disi+1 .

10. An automobile characterized by comprising: A vehicle battery display SOC correction system as claimed in claim 8 is installed; Or, a vehicle battery display SOC correction method as claimed in any one of claims 1 to 7 is used to correct the vehicle battery display SOC.

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